WO2020054787A1 - Device for manufacturing pet bottle - Google Patents

Device for manufacturing pet bottle Download PDF

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Publication number
WO2020054787A1
WO2020054787A1 PCT/JP2019/035782 JP2019035782W WO2020054787A1 WO 2020054787 A1 WO2020054787 A1 WO 2020054787A1 JP 2019035782 W JP2019035782 W JP 2019035782W WO 2020054787 A1 WO2020054787 A1 WO 2020054787A1
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WO
WIPO (PCT)
Prior art keywords
preform
pet bottle
heating
unit
section
Prior art date
Application number
PCT/JP2019/035782
Other languages
French (fr)
Japanese (ja)
Inventor
広明 藏田
Original Assignee
料材開発株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 料材開発株式会社 filed Critical 料材開発株式会社
Priority to CN201980059493.7A priority Critical patent/CN112672872A/en
Publication of WO2020054787A1 publication Critical patent/WO2020054787A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/28—Blow-moulding apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/68—Ovens specially adapted for heating preforms or parisons

Definitions

  • the present invention relates to a PET bottle manufacturing apparatus for manufacturing a PET bottle by molding a preform by an injection molding machine, removing the preform, and reheating by a blow molding machine.
  • a PET bottle manufacturing apparatus that manufactures a PET bottle by molding a preform with an injection molding machine, removing the preform, and reheating with a blow molding machine has been conventionally known (for example, see Patent Document 1).
  • the blow molding apparatus described in Patent Literature 1 circulates a plurality of disk-shaped pallets while inverting the preform through a pallet horizontal circulation path. It has a horizontal circulation path.
  • the pallet horizontal circulation path includes a preform supply unit for supplying a preform to each pallet, a heating unit for heating the preform carried on the pallet, and a preform carried on the pallet and heated by the heating unit. And a product collection unit that collects products formed by blow molding in the blow molding unit from a pallet.
  • the material of the preform described in Patent Document 1 is said to be made of polyester, polystyrene, polypropylene, polyethylene naphthalate, and polyethylene terephthalate.
  • PET polyethylene terephthalate
  • a whitening phenomenon occurs, and the portion does not swell well in the subsequent blow molding, and a defective PET bottle is completed.
  • the preform when blow molding a preform to manufacture a PET gallon bottle for a water server that is much larger than a normal PET bottle, the preform is much thicker than the preform for making a normal PET bottle. , The amount of heating increases accordingly.
  • a thicker preform is often used than a preform for making a normal plastic bottle.
  • Plastic bottles with irregular shapes often grow in length and breadth, so they are thicker than those with simple shapes, and in the case of irregular shapes, the appearance is often emphasized, and it is more luxurious than other PET bottles
  • Preforms that are thicker than usual are often used to produce Therefore, in order to sufficiently heat the thick portion, it is necessary to considerably increase the heating amount in accordance with the thickness of the preform as compared with a normal preform.
  • the preform which is thicker than a preform for manufacturing such a normal PET bottle, is heated rapidly when it is heated, the above-described whitening phenomenon (crystallization phenomenon) occurs immediately. Therefore, it is necessary to heat even a thick part with the same heating condition as that of a normal preform.
  • the heating temperature when increasing the production speed, if the heating temperature is increased above normal, the preform is whitened (crystallized), and cannot be blown to expand into a PET bottle shape. For this reason, the heating temperature does not have a significant change from the normal, and the heating section does not become a device in which the entire length of the heating section is elongated to increase the speed of passing the preform through the heating section and obtain heat penetration from the outside to the inside. This leads to an increase in the size of the machine.
  • heat-resistant plastic bottles which are one form of plastic bottles.
  • the heat-resistant plastic bottle is a plastic bottle that can withstand filling of a high-temperature liquid.
  • the difference between heat-resistant PET bottles and ordinary room-temperature bottles is that they do not deform even when filled with hot fillers.
  • the manufacturing process of heat-resistant PET bottles is almost the same as that of ordinary room-temperature bottles, but the heating temperature of the preform needs to be raised to just before whitening (crystallization). Also, there is a difference in the blow mold in the blow molding part, and the blow mold for a normal temperature bottle is cooled, whereas the blow mold for a heat-resistant bottle needs to heat the mold with a temperature controller or the like. .
  • a crystallized resin such as a PET bottle material preform (polyethylene terephthalate) becomes soft and stretchable when heated, but when it exceeds a certain temperature, it becomes white (crystallized) and cannot be stretched.
  • heat-resistant plastic bottles In order to increase the heat resistant temperature, the higher the heating temperature of the preform and the mold temperature during blow molding, the better. This is because the resin itself becomes harder when the finished heat-resistant PET bottle approaches whitening (crystallization), so that it becomes difficult to deform even when a high-temperature liquid is introduced. For this reason, heat-resistant plastic bottles have a whiter appearance than plastic bottles that are usually used at room temperature.
  • the object of the present invention is to make it possible to efficiently and stably produce a high-quality PET bottle without taking extra time by making the heating section as short as possible for any type of PET bottle, and to reduce the overall size.
  • An object of the present invention is to provide a PET bottle manufacturing apparatus that is designed to save space even in a limited installation space without increasing the size.
  • a PET bottle manufacturing apparatus In order to solve the above-mentioned problem, a PET bottle manufacturing apparatus according to claim 1 of the present invention is provided.
  • a PET bottle manufacturing device that manufactures PET bottles by blow molding
  • the PET bottle manufacturing device A transport line for sequentially transporting preforms blow molded as PET bottles at predetermined intervals, A preform loading unit that is provided upstream of the transport line and that loads the preform into the transport line;
  • a PET bottle removal unit provided on the downstream side of the transport line and for removing a PET bottle manufactured by the PET bottle manufacturing apparatus,
  • a blow molding unit provided on the upstream side of the transport line from the PET bottle removal unit,
  • the transfer line is provided between the preform input section and the blow molding section, and heat required for blow molding the preform in the blow molding section is applied to the preform by a predetermined amount in the transfer line.
  • a preform heating section performed over a section of A preform wind application unit that applies air to the preform at a predetermined position from the preform heating unit to the blow molding unit,
  • a rotating device configured to rotate the preform around its axis while heating the preform over a certain section of the transport line and applying wind.
  • the PET bottle manufacturing apparatus according to claim 2 of the present invention is the PET bottle manufacturing apparatus according to claim 1,
  • the preform wind application section is provided so as to apply air to the preform in at least a part of a process of heating the preform by the preform heating section.
  • the PET bottle manufacturing apparatus is the PET bottle manufacturing apparatus according to claim 2,
  • the preform wind application unit is characterized in that a wind application slit guide for applying air to a predetermined portion of the preform is provided.
  • the PET bottle manufacturing apparatus according to claim 4 of the present invention is the PET bottle manufacturing apparatus according to claim 1,
  • the preform wind application unit is characterized in that it is provided at a predetermined position before heating the preform in the preform heating unit and before entering the blow molding unit.
  • the PET bottle manufacturing apparatus is the PET bottle manufacturing apparatus according to any one of claims 1 to 4, It is characterized in that a preform that can be blow-molded into a PET gallon bottle for a water server can be charged into the preform charging section.
  • the PET bottle manufacturing apparatus is the PET bottle manufacturing apparatus according to any one of claims 1 to 4,
  • the present invention is characterized in that a preform that can be blow-molded into a specially shaped plastic bottle different in shape from a plastic bottle having a substantially constant diameter can be charged into the preform charging section.
  • a plastic bottle manufacturing apparatus is the plastic bottle manufacturing apparatus according to any one of claims 1 to 6,
  • the blow molding section has a structure capable of blow molding a plurality of PET bottles at a time.
  • plastic bottle manufacturing apparatus is the plastic bottle manufacturing apparatus according to any one of claims 1 to 7,
  • the PET bottle manufacturing apparatus is capable of manufacturing a heat-resistant PET bottle.
  • the PET bottle manufacturing apparatus according to claim 9 of the present invention is the PET bottle manufacturing apparatus according to any one of claims 1 to 8, Instead of the preform made of polyethylene terephthalate, a preform in which a crystallization phenomenon may occur in the heating process can be put into the preform feeding section.
  • a high-quality PET bottle can be efficiently and stably manufactured without extra time by making the heating section as short as possible for any type of PET bottle, and the overall size is reduced.
  • the PET bottle is a heat-resistant PET bottle, it is possible to provide a PET bottle manufacturing apparatus that can manufacture the PET bottle without complicated steps.
  • FIG. 2 is a schematic view of a preform and a mandrel passing between a heating unit and a wind application unit of the PET bottle manufacturing apparatus shown in FIG. 1 as viewed from an upstream side of a transport line. It is explanatory drawing which shows the heating state from the heating part with respect to the preform in FIG. 2, and the blowing state from the blowing part.
  • FIG. 4 is an explanatory diagram corresponding to FIG. 2, showing a heating state of a preform shown in FIG. 3 from a heating unit and a blowing state from a blowing unit. It is a top view showing roughly composition of a plastic bottle manufacturing device concerning a 2nd embodiment of the present invention.
  • the PET bottle manufacturing apparatus 1 is a type of manufacturing apparatus for manufacturing a PET bottle by reheating a preform taken out after being molded by an injection molding machine by a blow molding machine.
  • FIG. 1 is a plan view schematically showing a configuration of a plastic bottle manufacturing apparatus 1 according to the first embodiment of the present invention.
  • FIG. 2 is a schematic view of the preform 20 and the mandrel 100 passing between the heating unit and the air blowing unit of the PET bottle manufacturing apparatus 1 shown in FIG.
  • FIG. 3 is an explanatory diagram showing a state of heating the preform 20 from the heating unit and a state of blowing the preform 20 from the blowing unit in FIG.
  • FIG. 4 is an explanatory view corresponding to FIG.
  • FIG. 1 the number of mandrels 100 is illustrated to be small for easy understanding of the invention and for simplification of the illustration, but actually differs depending on the size of the PET bottle manufacturing apparatus 1, but is larger than the number illustrated. Are transferred by the transfer line 200 at predetermined intervals.
  • the PET bottle manufacturing apparatus 1 is a PET bottle manufacturing apparatus that manufactures a PET bottle 30 by blow molding, and the upper surface is horizontal in an installed state.
  • a preform charging unit 300, a preform heating unit 400 that sequentially heats the preforms 20 that are charged into the preform charging unit 300 and sent by the transport line 200, and a preform wind that is disposed to face the preform heating unit 400.
  • the contacting section 500 and the preform heating section 400 heat the heating section 400 so that Blow molding section 600 for sequentially blow molding the preforms 20 to be taken, and PET bottle removal for sequentially taking out the PET bottles 30 which are blow molded by the blow molding section 600, are manufactured as products from the preforms 20, and are sent by the transport line 200. It has a part 700.
  • a heated air exhaust unit 800 is provided in a portion where the preform heating unit 400 and the preform air contact unit 500 are arranged.
  • a transit air application unit 900 is provided near the transfer line 200 between the preform heating unit 400 and the blow molding unit 600.
  • the preform loading section 300 and a part of the corresponding transport line 200 are referred to as a preform loading station, a preform heating section 400 and a preform wind application section 500, and the transport line 200 sandwiched therebetween.
  • the part is a preform heating / blowing station
  • the blow molding part 600 for blow molding the preform 20 and a part of the corresponding transport line 200 are a preform blow molding station
  • the transit wind blowing part 900 and the corresponding transport A part of the line 200 is appropriately called a transit station.
  • the transport line 200 has a track shape in a plan view, and the mandrel 100 that moves while holding the preform 20 and the plastic bottle 30 in an inverted state is arranged at a predetermined interval. It moves counterclockwise in the figure at the speed.
  • the shape of the transfer line and the direction of movement of the mandrel in the present embodiment are merely examples of the present invention, and the transfer line in FIG. 1 is merely an example. That is, it is naturally conceivable that the transport line has a shape other than the track shape in plan view, and it goes without saying that the mandrel may move in the clockwise direction in the drawing.
  • the transfer line 200 includes a preform transfer line section 210 (a section where only the circle inside the double circle indicating the mandrel 100 in the figure is hatched) from the preform input section 300 to the blow molding section 600, and blow molding.
  • the section from the section 600 to the PET bottle removal section 700 is a PET bottle transport line section 220 (section where the entire double circle indicating the mandrel 100 in the figure is hatched), and the section from the PET bottle removal section 700 to the preform loading section 300.
  • a rotating device 250 is provided below the transport line 200 defined between the preform heating unit 400 and the preform wind application unit 500 and the transport line 200 near the transit wind application unit.
  • the rotating device 250 rotates the preform 20 by rotating the mandrel 100 while heating the preform 20 over a certain section of the transport line 200 at the preform heating / blowing station, and at both the transit station. It is designed to rotate around the axis.
  • the mandrel 100 includes a housing 110 and a mouth mounting portion 120 detachably fixed to the housing 110.
  • the mouth mounting portion 120 is inserted into the mouth portion 21 of the preform 20 so that the two fit tightly, and the preform 20 and the plastic bottle 30 after blow molding are vertically inverted while the mandrel 100 is kept on the mandrel 100. It is designed to hold it.
  • the preform loading section 300 fits the opening 21 of the preform 20 into the opening mounting section 120 of the empty mandrel 100, and puts the preform 20 into the mandrel 100. It plays a role of sequentially supplying a large number of preforms 20 to the next heating / blowing station in an inverted state.
  • Various known devices such as a dedicated loading device and a robot of a rectangular coordinate type are used for the preform loading unit 300.
  • the preform heating unit 400 is provided on one side of the conveying line 200 of the heating / blowing station occupying a certain section of the conveying line 200.
  • the preform heating unit 400 includes heaters 411, 412, 413, 414, 415, and 416 (410) each extending in a horizontal direction across the front side of the transport line 200 and a solid line in FIG.
  • a plurality (six in this embodiment, which is a small number for ease of understanding and illustration of the present invention) are arranged at predetermined intervals in the vertical direction.
  • the arrangement height of the heater 411 in the lowermost stage is determined by adding a heating amount that expands the vicinity of the preform 20 except for the mouth portion 21 that is placed on the mandrel 100 and passes through the heating / blowing station by blow molding. It has a suitable height.
  • the number of heaters differs depending on the model of the PET bottle manufacturing apparatus. Usually, for example, more than 10 heaters, such as more than 10 heaters, are arranged at predetermined intervals, and preforms having different heights are used. Can be heated.
  • a heating unit internal wind contact unit 420 is provided on the back side of each heater 410.
  • the heating unit internal wind application unit 420 is configured by a fan or a blower, and efficiently heats the preform 20 in the heating / air application station without the air heated in each heater 410 staying in the heater (without stopping). It serves to heat (see the thin wavy arrow from right to left in FIG. 4).
  • the amount of heating by which the preform heating section 400 heats each preform 20 can be set higher by adjusting the heater. At least a portion of the preform 20 is whitened (crystallized) when the preform wind application unit 500 is not operated. However, when the preform air application unit 500 is operated, such whitening (crystallization) occurs even at high temperature heating. There can be no heating amount. That is, the heating amount per each preform 20 in the transport line 200 in the heating / air blowing station can be increased by that amount, as compared with a conventional PET bottle manufacturing apparatus having no preform air blowing section 500.
  • the preform blowing unit 500 is provided on the other side of the preform heating unit 400 with respect to the transport line 200 of the heating and blowing station that occupies a certain section of the transport line 200.
  • the preform blowing section 500 causes a blower 510 such as a fan, a blower, or a compressor, and a flow of air blown by the blower 510 to locally hit the entire preform.
  • a blower 510 such as a fan, a blower, or a compressor
  • the wind contact slit guide 520 is arranged such that a plurality of partition plates 521 to 527 face each other at a predetermined interval in the same direction. Then, the air blown from the blower 510 is regulated between the partition plates 521 to 527 forming the wind application slit guide 520, and is locally blown from the slit guide to the entire preform. (Refer to the white arrows shown between the wind contact slit guides 520 in FIG. 3 and the white arrows from left to right shown in the wind contact slit guide 520 in FIG. 4).
  • the spacing between the wind application slits is wide and the number of the air application slits is small for easy understanding and illustration of the invention.
  • the present invention is not limited to such an embodiment. Instead, more wind guide slits are provided in consideration of the effect of the wind on the preform.
  • the air blown out toward each preform 20 via the wind application slit guide 520 is heated by the heater and blows over the entire preform 20 moving on the transport line 200 while rotating around the axis. This is the case.
  • This serves to suppress the occurrence of a whitening phenomenon (crystallization phenomenon) based on a rapid rise in the temperature of the surface of the preform 20 heated by each heater 410, and to reduce the temperature difference between the inner and outer surfaces of the preform. It is possible to make the preform state optimal for bottle molding.
  • the amount of air applied to each preform 20 by the preform air application unit 500 is such that at least a portion of the preform 20 is whitened (crystallized) by high-temperature heating from the preform heating unit 400 unless the preform air application unit 500 is operated.
  • the amount of blowing can be adjusted so that such whitening (crystallization) does not occur even with high-temperature heating.
  • the preform wind application unit 500 does not perform automatic inverter control.
  • the motor is automatically controlled by the temperature in the preform heating unit 400, the air volume changes, and the surface temperature of the preform 20 to be heated also varies. is there.
  • the strength of the wind applied to the preform 20 can be manually adjusted, and conditions must be set such that the same air volume is always obtained when the wind is applied while heating the preforms 20 of the same lot. I have it.
  • the preform 20 being heated may be blown by a control method other than the embodiment.
  • the heated air exhaust unit 800 is installed above the space between the preform heating unit 400 and the preform air contact unit 500.
  • the heated air exhaust unit 800 serves to entirely inhale and exhaust the air after heating the preform 20 generated in the heating and blowing station (curved toward the heated air exhaust unit 800 in FIG. 4). See upward arrow).
  • the heated air exhaust unit 800 is connected to the preform heating unit 400. It is installed above a space between the preform wind application section 500 and the preform wind application section 500. However, when the mouth 21 of the preform 20 (the spout of the PET bottle 30 after blow molding) is directed upward according to the structure of the PET bottle manufacturing apparatus 1, the heated air flows through the mouth of the preform 20. There is a case where the heated air exhaust unit 800 is installed in the heating / blowing station so that the heated air is discharged downward so as not to hit the unit 21.
  • the transit wind application unit 900 is in a standby position before entering the blow molding station from the heating and air application station, that is, while the preform 20 attached to the next mandrel 100 is being blow molded by the blow molding unit 600.
  • the preform 20 is provided at the transit station where the entire mandrel 100 stays, and is heated from the heating / winding station to exit the preform 20 immediately before entering the molds 611, 612 (610) of the blow molding section 600. Plays the role of guessing.
  • the transit wind application unit 900 uses an appropriate air application device such as a fan, a blower, or a compressor, similarly to the preform air application unit 500.
  • the transit air contact portion may be used in accordance with the crystallization state of the preform 20 immediately before blow molding.
  • a determination is made whether to apply the wind at 900. That is, when it is clear that the preform 20 will not be whitened (crystallized) at the transit station, there is no need to operate the transit wind application unit 900.
  • the transit wind contact portion 900 may be provided entirely along the transport line 200 and in the vicinity thereof.
  • the blow molding section 600 is provided so as to straddle the transport line 200.
  • the preform 20 before blow molding is attached to the mandrel 100 from the upstream side of the transfer line 200 and moves, the halves 611 and 612 of the mold 610 are separated from each other as shown in FIG. Then, the mandrel 100 and the preform 20 fitted into the mandrel 100 are positioned and stopped as specified in the PET bottle forming station. Then, after these stops, the halves 611 and 612 of the mold 610 come into contact with each other to be in a closed state, thereby forming the blow molding mold 610.
  • the half portions 611 and 612 of the mold 610 are separated from each other again to be in an open state, and the PET bottle 30 after blow molding is removed from the mandrel. Each 100 is moved toward the PET bottle removal unit 700.
  • the PET bottle removal unit 700 is configured to remove the PET bottle 30 that is formed as the PET bottle 30 in the blow molding unit 600 and moves on the transport line 200 while being attached to the mandrel 100, at the PET bottle removal station. It plays the role of taking it out as a product.
  • various known devices such as a dedicated removal device and an orthogonal coordinate type robot are used similarly to the preform loading unit 300.
  • the base 11 is provided with a control device (not shown in the drawing) for moving the respective components of the plastic bottle manufacturing apparatus 1 according to the above-described embodiment at a predetermined operation timing while synchronizing with each other.
  • a control device (not shown in the drawing) for moving the respective components of the plastic bottle manufacturing apparatus 1 according to the above-described embodiment at a predetermined operation timing while synchronizing with each other.
  • An input device and a display device (not shown in the drawing) are provided for the operator of the device 1 to operate the device and check the operation status of the device.
  • the preform 20 is inserted one by one into the mouth mounting part 120 of each mandrel 100 in the preform input part 300. And it is conveyed to the heating / winding station along the preform conveyance line section. Each mandrel 100 is rotated by the rotating device 250 when approaching the heating / winding station. Along with this, the preform 20 fitted in each mouth mounting part 120 also rotates around its axis with each mouth mounting part 120.
  • the preform 20 passes between the preform heating unit 400 and the preform wind application unit 500 of the heating / air application station while rotating.
  • a larger heating amount than usual such that at least the surface of the preform 20 is whitened (crystallized) without local blowing from the preform blowing section, is used.
  • a larger heating amount than usual such that at least the surface of the preform 20 is whitened (crystallized) without local blowing from the preform blowing section, is used. Applied by each heater 410.
  • the heating / winding is performed while the whitening phenomenon (crystallization phenomenon) of the preform 20 is prevented by the local blowing from the preform blowing unit 500.
  • the preforms 20 pass through the contact station in sequence.
  • the air after heating the preform 20 in the heating / winding station is constantly discharged through the heated air exhaust unit 800, and the preform 20 passes through the heating / winding station.
  • the amount of heating and the amount of air applied by the preform heating unit 400 for suppressing the occurrence of the whitening phenomenon (crystallization phenomenon) of the preform 20 are always supplied to the preform 20 in a well-balanced manner. Since the heated air is discharged to the opposite side of the mouth 21 of the preform 20, only the portion of the preform 20 to be heated can be heated.
  • the length of the preform heating section 400 constituting the heating / blowing station which is a characteristic part of the present invention, is shorter than that of the conventional PET bottle manufacturing apparatus, the preform 20 passing therethrough is short-lived. Thus, heating is efficiently performed to the extent that blow molding can be performed without causing a whitening phenomenon (crystallization phenomenon).
  • the preform 20 heated in the heating / winding station waits while being attached to the mouth mounting portion 120 of the mandrel 100 until the preform 20 conveyed before in the transit station is blow-molded in the blow molding station. . Also at this time, the preform 20 continues to rotate together with the mouth mounting part 120 by rotating the mandrel 100 by the rotating device 250. Then, the wind is blown all around the axis of the preform 20 by the transit wind contact portion 900 provided in the transit station, thereby preventing the whitening phenomenon (crystallization phenomenon) from occurring in the transit station.
  • the blow molding die 610 of the blow molding station is opened, and the subsequent heated preform 20 is blow molded together with the mandrel 100 while being attached to the mouth mounting portion 120. Move to the station and stop. Then, the blow molding die 610 is closed, and the preform 20 is blow molded to the size of the PET bottle 30.
  • the blow-molded PET bottle 30 moves the PET bottle transport line section of the transport line 200 together with the mandrel 100 to the PET bottle removal station with the spout fitted in the mouth mount 120. Then, with the mandrel 100 stopped at the PET bottle removal station, the PET bottle 30 is sequentially removed as a product from the mouth mounting portion 120 of the mandrel 100 by the PET bottle removal unit 700.
  • the empty mandrel 100 from which the PET bottle 30 has been taken out of the mouth mounting portion 120 moves again to the preform loading station through the empty mandrel transfer line section of the transfer line 200, and repeats the above-described series of steps again.
  • One of the problems with applying heat to a preform made of polyethylene terephthalate (PET) is that if the preform is rapidly heated at a temperature exceeding a certain temperature in the heating process, the surface is crystallized (whitened), and the subsequent blowing is performed. No longer elongate in the molding process. That is, the preform whose crystallized portion has not been stretched in the blow molding step is blow molded as a defective PET bottle having no specified shape. Therefore, there is a limit in how to raise the temperature of the heater in the heating step, and it is necessary to provide a heating station that is relatively long along the transport line.
  • PET polyethylene terephthalate
  • the temperature of the surface of the preform becomes high due to the temperature gradient in the thickness direction inevitably caused by heating only from the surface of the preform, In some cases, only the surface is whitened (crystallized).
  • the preform is heated by the heater at the heating / blowing station, and at the same time, the preform is locally blown from the breeze slit guide of the preform breeze section, thereby increasing the thickness. Even if the preform has a large thickness, the temperature difference between the inner and outer surfaces can be reduced, and a state in which the inner surface reaches a predetermined temperature without whitening (crystallization) can be created without extra time.
  • the air is applied in a transit (standby) section defined before the preform that has exited the heating / air application station enters the mold for blow molding. be able to.
  • the preform blasting section as described above forms a blasting section at the heating / blowing station and the transit station, and forcibly cools the surface of the preform, thereby reducing the heater temperature of the heating device. It is technically significant that the inventors have noticed that the whitening phenomenon (crystallization phenomenon) can be prevented from occurring on the surface of the preform even if the height is increased.
  • the preform is constantly rotating by the rotating device during the wind application, the heat of the heater is uniformly applied to the outer peripheral surface of the preform, and the air blown out from the guide slit of the air application portion is uniformly applied.
  • the surface of the preform is prevented from becoming hot and causing whitening (crystallization) as in the conventional case. be able to.
  • the preform can be heated to a stable preform at a high temperature as a whole, and the blow molding becomes easy thereafter.
  • the preform is heated at a temperature at which the preform surface is not slowly whitened in order to prevent the surface of the preform from becoming high temperature and causing whitening (crystallization) as in the prior art by the wind application technique unique to the present invention. Since it is not necessary to take measures to infiltrate heat, the temperature of the heater can be increased and the heating time can be shortened. As a result, the heater zone can be shortened, so that the power consumption of the heating device can be reduced.
  • the heating time must be long, and thus a long heating station is required.
  • the heating time can be shortened in the heating process of the preform.
  • the PET bottle manufacturing apparatus of the present invention stable blow molding can be performed even if the thickness of the preform is large, and a PET bottle with a good yield can be manufactured.
  • preforms for producing various types of PET bottles can be put into this PET bottle production apparatus.
  • a thick preform that can be blow-molded into a PET gallon bottle for a water server is given as an example.
  • a plastic bottle having a different shape from a general plastic bottle having a substantially constant diameter, that is, a deformed shape that three-dimensionally imitates a famous building as a popular anime character or a tourist attraction for example.
  • This PET bottle manufacturing apparatus can also be used for thick preforms that can be blow molded into PET bottles.
  • the apparatus can be designed to be more space-saving than a large machine.
  • the machine is not increased in size.
  • the heating temperature is raised above normal to increase the production speed, the preform will whiten (crystallize), blow and expand to the shape of a PET bottle. Was difficult.
  • the heating temperature does not have a significant change from the normal, the speed of passing the preform through the heating part is increased, and the entire length of the heating part is elongated to obtain heat penetration from the outside to the inside. This had to be the case, leading to larger machines.
  • the preform can be heated at a high temperature by the air blowing device, and the characteristics corresponding to the space-saving design can be utilized by shortening the heater zone. Since heating can be performed in a short period of time, the mold can be put into a large number of molds for mass production and blow-molded, a large number of PET bottles can be manufactured in a shorter time than before.
  • the PET bottle manufacturing apparatus is suitable for manufacturing a heat-resistant PET bottle.
  • the problem relating to a heat-resistant plastic bottle which is one mode of the plastic bottle described in detail in the problem to be solved can be solved. That is, according to the present invention, unlike the conventional case, the high-temperature heat can penetrate from the outside to the inside of the preform. It is possible to solve the problem that only a bottle with a low heat-resistant temperature can be molded because the preform cannot be expanded to the shape of a PET bottle, or the preform cannot be heated to just before whitening to avoid whitening on the outside of the preform. .
  • the preform When inflating a large-capacity bottle such as a gallon bottle, the preform is heated at a high temperature to form the corners, so the corners may be shrunk (crumpled) or whitened (crystallized). In many cases, it has been extremely difficult to obtain ideal molding conditions in the past, but such a problem can be solved at a stretch by using the blowing technique according to the present invention.
  • PET bottles with high draw ratios PET bottles that need to stretch a lot of preforms.
  • Thick preforms used when manufacturing bottles with complex shapes take time for heat to penetrate into the interior, so use the air blowing technology to reduce the penetration time to the inside of the preform and reduce the temperature of the surface and inner surface.
  • PET bottles of stable quality can be formed.
  • the scope of the present invention is not limited to the above-described embodiment. That is, the present invention is not limited to the material of the preform in the above-described embodiment.
  • the preform instead of the preform made of polyethylene terephthalate, the preform may be made of, for example, polypropylene (PP), which may cause a crystallization phenomenon in a heating process. It is also possible to put the preform into the preform feeding section of the PET bottle manufacturing apparatus according to the present invention.
  • PP polypropylene
  • the scope of the present invention is not limited to the shapes and numbers given for each component in the above-described embodiment.
  • the entire transport line is installed above the PET bottle manufacturing equipment, and a mandrel for attaching preforms and PET bottles is provided at predetermined intervals downward in the transport line, so that the preforms and PET bottles can be suspended along the transport line.
  • the present invention is also applicable to a PET bottle manufacturing apparatus in which these are moved.
  • the heated air exhaust unit of the heating / winding station may be configured to be located on the side opposite to the mouth of the preform.
  • the preform air contact section 500 is provided in the same length as the heater 410 of the preform heating section 400 along the mandrel conveyance direction, but the preform is not necessarily equivalent thereto. It goes without saying that the length of the remodeling air contact portion 500 can be changed as appropriate, for example, if the action can be sufficiently exerted, such as by shortening the length a little.
  • the blow molding section may have a structure capable of blow molding a plurality of PET bottles at a time.
  • a structure is conceivable in which a plurality of dies are arranged in series in a blow molding unit, and a preform is blow-molded simultaneously in each of the dies to form a PET bottle. Since the preform heating section is shorter than that of a conventional mass production machine, mass production can be performed even in a manufacturing apparatus having a space-saving design compared to the conventional one.
  • a preform in which a crystallization phenomenon may occur during the heating process can be charged into the preform charging section instead of the above-described preform made of polyethylene terephthalate. More specifically, for example, a preform made of a thermoplastic resin such as polypropylene (PP) is put into a preform feeding section to reduce the size of a PET bottle that can be used as a beverage container or a food container made of polypropylene. It is possible to mass-produce with the PET bottle manufacturing apparatus.
  • PP polypropylene
  • FIG. 5 is a plan view schematically showing a configuration of a PET bottle manufacturing apparatus according to the second embodiment of the present invention.
  • the plastic bottle manufacturing apparatus according to the second embodiment basically has a configuration equivalent to the plastic bottle manufacturing apparatus according to the first embodiment, and thus the second embodiment is different from the both. Only the characteristic portions of the present embodiment will be described, and the other components will be denoted by the same reference numerals in the drawings and detailed description thereof will be omitted.
  • the number of mandrels 100 is illustrated to be smaller for easier understanding of the invention and for simplification of the illustration, but actually differs depending on the size of the PET bottle manufacturing apparatus 2, but is smaller than the number illustrated.
  • a large number of mandrels 100 are transported by the transport line 200 at short intervals from each other.
  • the preform blowing unit 500 is provided so as to blow the preform 20 in the process of heating the preform 20 by the preform heating unit 400.
  • the transit air blowing unit 900 is provided as a supplemental air blowing device at a predetermined position in the transit zone from when the preform 20 is heated to when it enters the blow molding unit 600.
  • the transit air contact section 900 serves only as an auxiliary air contact. If the main preform contact section 500 is provided at a position facing the preform heating section 400, the auxiliary air contact section 900 is provided. It has been described that the typical transit wind contact portion 900 is not necessarily required.
  • the preform heating unit 400 includes a heating-promoting reflection instead of the preform air contacting unit 500 of the first embodiment.
  • the transit zone air contact portion 950 is provided as a main air contact portion in the present embodiment. ing.
  • the heating-promoting reflector 550 is provided on the opposite side of the heating heater 410 via the transport line 200, and serves to efficiently apply heat to the preform 20 by reflecting the heat of the heater 410. . Note that the heating-promoting reflector 550 of the preform heating unit 400 is provided for the time being in the second embodiment, and is not necessarily required for implementing the present invention according to the heating condition of the preform 20.
  • the structure of the preform heating unit 400 according to the second embodiment is the same as that of the first embodiment except that a heating-promoting reflector 550 is provided instead of the preform air contacting unit 500, and is therefore common. Description of each component is omitted.
  • the transit zone blasting section 950 has the same basic configuration as the transit blasting section 900 of the first embodiment, but does not cause a whitening (crystallization) phenomenon while passing through the preform heating section 400. In this case, measures for sudden whitening (crystallization) can be taken at low cost.
  • FIG. 5 only one transit zone air contact portion 950 is illustrated for convenience of explanation and to facilitate understanding of the invention. However, depending on the model, a structure in which the wind hits several preforms 20 may be used. In fact, the arrangement is not limited to the configuration of the mandrel 100 as shown in FIG.
  • the transit zone wind is located at a predetermined position between the time when the preform 20 is heated by the preform heating section 400 and the time when the preform 20 enters the blow molding section 600. Even if the contact portion 950 is provided, the function and effect unique to the present invention can be sufficiently exhibited. This will be described below.
  • the temperature of the inner and outer surfaces of the preform has no difference (is constant). That is, it is preferable that there is no temperature gradient from the outer peripheral surface to the inner peripheral surface of the preform (the gradient of the temperature decrease) or that it is as small as possible even if various factors affecting the temperature are considered.
  • the preform heating section is not provided with a preform wind application section, when the preform is heated by the preform heating section, the heat is transmitted in one direction from the outside to the inside of the preform. At the time of exiting the heating section, the outside and inside temperatures may not be constant. This tends to be more pronounced as the thickness of the preform increases.
  • the state in which the temperature of the outside of the preform is higher than the temperature of the inside in the transit zone immediately after the heating process in which the preform has left the preform heating unit is exposed to wind from the outside, and the inside and outside surfaces are exposed.
  • the effect of the present invention can be sufficiently exerted for the same reason as in the first embodiment in which the preform heating unit applies air to the preform by the preform air application unit. That is, whitening (crystallization) occurs as in the conventional PET bottle manufacturing apparatus having no air blowing section in the preform heating section and the subsequent transit zone, and bottle molding failure due to an uneven temperature difference between the inner and outer surfaces. Can be prevented from occurring.
  • the present invention can be applied. The effect can be fully exhibited.
  • the installation position of the transit zone air application section 950 typically shown in FIG. 5 may be used.
  • the length is preferably determined through simulation, on-site verification, or the like in consideration of the amount of wind blown by the transit zone wind blowing unit 950, the wind speed, and the like.
  • the existing PET bottle manufacturing apparatus that is, the manufacturing apparatus in which the preform heating section is not provided with the preform blowing section is provided with the transit zone blowing section. It can be retrofitted. This raises the temperature of the heater of the conventional preform heating device and raises the moving speed of the transfer line in the heating device of the mandrel, so that all the preforms pass through the heating process in a shorter time than before. Will be able to do that.
  • the whitening (crystallization) phenomenon of the preform may occur immediately after leaving the preform heating apparatus, or the temperature gradient of the heat distribution between the outside and the inside of the preform may be reduced.
  • a transit zone air contact section was retrofitted to the existing PET bottle manufacturing apparatus as in the second embodiment according to the present invention. By doing so, in the transit zone after the preform has exited the preform heating device, the preform can be blown by the transit zone breeze part, and the seriousness based on the conventional whitening (crystallization) can be caused. Problems can be avoided.
  • the time of the heating process in the preform heating apparatus of the manufacturing apparatus is further improved. Can be shortened. This can share the special advantage that more PET bottles can be manufactured more efficiently in a fixed time.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

[Problem] To provide a PET bottle manufacturing device whereby any type of PET bottle, including a heat-resistant PET bottle, can be efficiently manufactured, the overall size of the PET bottle manufacturing device is not increased, and the device can be installed in a limited space. [Solution] A PET bottle manufacturing device 1 having: a conveyance line 200 for sequentially conveying preforms blow-molded as PET bottles at a predetermined spacing; a preform inputting unit 300 for inputting preforms into the conveyance line; a PET bottle extraction unit 700 for extracting manufactured PET bottles; a blow molding unit 600; a preform heating unit 400 for performing, through a predetermined section of the conveyance line, the heating necessary for blow molding of the preforms by the blow molding unit; and a preform air-blowing unit 500 for blowing air on the preforms as the preforms are being heated by the preform heating unit.

Description

ペットボトル製造装置PET bottle manufacturing equipment
　本発明は、プリフォームを射出成形機で成形してから取り出しブロー成形機で再加熱してペットボトルを製造するペットボトル製造装置に関する。 The present invention relates to a PET bottle manufacturing apparatus for manufacturing a PET bottle by molding a preform by an injection molding machine, removing the preform, and reheating by a blow molding machine.
　プリフォームを射出成形機で成形してから取り出しブロー成形機で再加熱してペットボトルを製造するペットボトル製造装置は従来から知られている（例えば、特許文献１参照）。 2. Related Art A PET bottle manufacturing apparatus that manufactures a PET bottle by molding a preform with an injection molding machine, removing the preform, and reheating with a blow molding machine has been conventionally known (for example, see Patent Document 1).
　係る特許文献１に記載のブロー成形装置は、その段落（００２４）に記載されたように、複数の円盤状のパレットを、パレット水平循環路を介してプリフォームを倒立状態にしながらそれぞれ循環させるパレット水平循環路を有している。そして、このパレット水平循環路には、プリフォームを各パレットに投入するプリフォーム供給部と、パレットに担持させたプリフォームを加熱する加熱部と、パレットに担持され加熱部で加熱されたプリフォームをブロー成形するブロー成形部と、ブロー成形部でブロー成形されることでできた製品をパレットから回収する製品回収部が備わっている。 As described in the paragraph (0024), the blow molding apparatus described in Patent Literature 1 circulates a plurality of disk-shaped pallets while inverting the preform through a pallet horizontal circulation path. It has a horizontal circulation path. The pallet horizontal circulation path includes a preform supply unit for supplying a preform to each pallet, a heating unit for heating the preform carried on the pallet, and a preform carried on the pallet and heated by the heating unit. And a product collection unit that collects products formed by blow molding in the blow molding unit from a pallet.
特開２００４－２８４０１６号公報JP 2004-284016 A
　係る特許文献１に記載のプリフォームの材質は、ポリエステル、ポリスチレン、ポリプロピレン、ポリエチレンナフタレート、ポリエチレンテレフタレートからなるとされている。ここで、例えばペットボトルの材質となるポリエチレンテレフタレート（ＰＥＴ）からなるプリフォームをブロー成形する場合、ブロー成形前の加熱装置によるプリフォームの加熱過程において急激又は一定温度を超える高温で加熱を行うと、白化現象（結晶化現象）が生じ、その後のブロー成形においてその部分がうまく膨らまず、不良品のペットボトルができあがってしまう。 The material of the preform described in Patent Document 1 is said to be made of polyester, polystyrene, polypropylene, polyethylene naphthalate, and polyethylene terephthalate. Here, for example, when blow molding a preform made of polyethylene terephthalate (PET) which is a material of a PET bottle, if heating is performed rapidly or at a high temperature exceeding a certain temperature in a heating process of the preform by a heating device before blow molding. Then, a whitening phenomenon (crystallization phenomenon) occurs, and the portion does not swell well in the subsequent blow molding, and a defective PET bottle is completed.
　特に、通常のペットボトルに比べてはるかに大きいウォーターサーバー用ペットガロンボトルを製造するためにプリフォームをブロー成形する場合、通常のペットボトルを作る場合のプリフォームよりもかなり肉厚の厚いプリフォームを使用するので、その分加熱量が大きくなる。 In particular, when blow molding a preform to manufacture a PET gallon bottle for a water server that is much larger than a normal PET bottle, the preform is much thicker than the preform for making a normal PET bottle. , The amount of heating increases accordingly.
　そのため、生産効率を上げるために急激に加熱すると、上述した問題が発生する一方、白化現象の発生を抑えるために徐々に加熱していくと加熱工程にかなりの時間を要し生産効率が落ちてしまう。白化現象の発生を抑えつつ加熱する為には、ゆっくり時間をかけ加熱し、プリフォームの外側から内側まで熱を浸透させる必要があるため、加熱部は全長が長くなり、結果としてペットボトル製造装置自体の大きさが大型化してしまう。また、ボトル製造時間も余分にかかることになってしまう。 Therefore, when the heating is performed rapidly to increase the production efficiency, the above-described problem occurs.On the other hand, when the heating is performed gradually to suppress the occurrence of the whitening phenomenon, a considerable time is required for the heating process, and the production efficiency decreases. I will. In order to heat while suppressing the occurrence of the whitening phenomenon, it is necessary to heat slowly and slowly to allow the heat to penetrate from the outside to the inside of the preform. The size of itself increases. In addition, an extra bottle manufacturing time is required.
　また、略一定の直径を有する一般的なペットボトルとは異なる例えば人気のあるアニメのキャラクターや観光名所としての有名な建造物を三次元的に模したような異形形状のペットボトルを製造するためにプリフォームをブロー成形する場合においても、同様の問題が生じる。 In addition, in order to manufacture a plastic bottle having a different shape from a general plastic bottle having a substantially constant diameter, for example, a three-dimensional model of a famous building as a popular anime character or a tourist attraction. A similar problem arises when the preform is blow molded.
　具体的には、異形形状のペットボトルをつくる場合、通常のペットボトルを作る場合のプリフォームよりも肉厚のプリフォームを使う場合が多い。異形形状のペットボトルは縦横複雑に伸びることが多いので、簡易的形状のものより肉厚のものになり、また異形形状の場合は見た目が重視されることも多く、他のペットボトルより高級感を出すためにも通常より肉厚のプリフォームがよく使われる。そのため、この肉厚の厚い部分を十分に加熱するために通常のプリフォームよりも加熱量をその肉厚に応じてかなり増加させる必要がある。 Specifically, when making a plastic bottle with an irregular shape, a thicker preform is often used than a preform for making a normal plastic bottle. Plastic bottles with irregular shapes often grow in length and breadth, so they are thicker than those with simple shapes, and in the case of irregular shapes, the appearance is often emphasized, and it is more luxurious than other PET bottles Preforms that are thicker than usual are often used to produce Therefore, in order to sufficiently heat the thick portion, it is necessary to considerably increase the heating amount in accordance with the thickness of the preform as compared with a normal preform.
　このような通常のペットボトルを製造するためのプリフォームに比べて肉厚の厚いプリフォームを加熱する際に急激に加熱したのでは、上述した白化現象（結晶化現象）がすぐに生じてしまうため、肉厚の厚い部分においても通常のプリフォームの加熱具合と同等の加熱具合をもってして加熱していく必要がある。 If the preform, which is thicker than a preform for manufacturing such a normal PET bottle, is heated rapidly when it is heated, the above-described whitening phenomenon (crystallization phenomenon) occurs immediately. Therefore, it is necessary to heat even a thick part with the same heating condition as that of a normal preform.
　その結果、パレットに担持された状態で搬送ラインを移動しながら加熱する加熱部の全長を長くして徐々に加熱していく必要がある。これは、即ち搬送ラインにおける加熱部の占める長さがその分かなり長くなることを意味する。そのため、ペットボトル製造装置自体もかなり大型化してしまう。 As a result, it is necessary to increase the overall length of the heating unit that heats while moving the transport line while being carried on the pallet, and gradually heat the heating unit. This means that the length occupied by the heating section in the transport line is considerably longer. Therefore, the PET bottle manufacturing apparatus itself becomes considerably large.
　装置の大きさに関して言えば、限られたスペースにペットボトル製造装置を設置するため、大型機よりも省スペース設計の装置が望まれる場合が多い。また、生産量を上げるために装置台数を増やすことはよくあるが、スペースが限られているため、少ない台数のペットボトル製造装置しか設置することができない。 Speaking of the size of the device, in order to install the PET bottle manufacturing device in a limited space, a device with a space-saving design rather than a large machine is often desired. Although it is common to increase the number of apparatuses in order to increase the production amount, the space is limited, so that only a small number of PET bottle manufacturing apparatuses can be installed.
　一方、上述したプリフォームの加熱時間や、プリフォームからペットボトルにブロー成形するために一定の時間が必要とされるため、ペットボトル製造装置の設置台数が少なくなるということは、ペットボトル生産量が低下することを意味し、その結果短期間で大量のペットボトルを製造して納品しなければならないような事態に対応することができない可能性も生じる。 On the other hand, since the heating time of the preform described above and a certain period of time are required to blow-mold the preform into the PET bottle, the number of installed PET bottle manufacturing apparatuses is reduced, which means that the production amount of the PET bottle is reduced. Is reduced, and as a result, it may not be possible to cope with a situation where a large number of plastic bottles must be manufactured and delivered in a short period of time.
　短期間で大量のペットボトルを製造して納品しなければならないと言ういわゆる大量生産が求められる場合、当然のことながら時間当たりの生産本数を増やす必要がある。そのため、金型個数が多く生産スピードも速い量産機用の機種が用いられることが多いが、一般的な量産機の場合、生産スピードを上げるために加熱部の全長を長くし、機械が大型化してしまう。 い わ ゆ る If so-called mass production is required, which means that a large number of PET bottles must be manufactured and delivered in a short period of time, it is necessary to naturally increase the number of production bottles per hour. For this reason, models for mass production machines with a large number of dies and high production speed are often used.However, in the case of general mass production machines, the overall length of the heating section is increased to increase production speed, and the machine becomes larger. Would.
　また、一般的に生産スピードを上げる場合、加熱温度を通常より上げる方法ではプリフォームが白化（結晶化）してしまい、ブローしてペットボトル形状まで膨らますことができない。そのため、加熱温度は通常と大幅な変化は持たせず、プリフォームの加熱部通過速度を上げ、かつ外側から内側への熱の浸透を得るために加熱部の全長を長く伸ばした装置とならざるを得ず、機械の大型化につながることが問題となっている。 一般 In general, when increasing the production speed, if the heating temperature is increased above normal, the preform is whitened (crystallized), and cannot be blown to expand into a PET bottle shape. For this reason, the heating temperature does not have a significant change from the normal, and the heating section does not become a device in which the entire length of the heating section is elongated to increase the speed of passing the preform through the heating section and obtain heat penetration from the outside to the inside. This leads to an increase in the size of the machine.
　更には、ペットボトルの一形態である耐熱ペットボトルに関する問題も生じている。ここで耐熱ペットボトルとは、高温の液体の充填にも耐えることができるペットボトルのことである。耐熱ペットボトルと一般の常温ボトルの違いは、高温の充填物を入れても変形しないところにある。 Furthermore, there is a problem with heat-resistant plastic bottles, which are one form of plastic bottles. Here, the heat-resistant plastic bottle is a plastic bottle that can withstand filling of a high-temperature liquid. The difference between heat-resistant PET bottles and ordinary room-temperature bottles is that they do not deform even when filled with hot fillers.
　耐熱ペットボトルの製造工程は、一般の常温ボトルとほぼ同様だが、プリフォームの加熱温度を白化（結晶化）寸前まで上げる必要がある。また、ブロー成形部でのブロー金型にも違いがあり、常温ボトル用ブロー金型が冷却されるのに対し、耐熱ボトル用ブロー金型は温調機等で金型を加熱する必要がある。 The manufacturing process of heat-resistant PET bottles is almost the same as that of ordinary room-temperature bottles, but the heating temperature of the preform needs to be raised to just before whitening (crystallization). Also, there is a difference in the blow mold in the blow molding part, and the blow mold for a normal temperature bottle is cooled, whereas the blow mold for a heat-resistant bottle needs to heat the mold with a temperature controller or the like. .
　ペットボトル素材のプリフォーム（ポリエチレンテレフタレート）のような結晶化樹脂は、熱を加えると柔らかくなり延伸させることができるが、ある一定の温度を超えると白化（結晶化）し延伸できなくなる。 結晶 A crystallized resin such as a PET bottle material preform (polyethylene terephthalate) becomes soft and stretchable when heated, but when it exceeds a certain temperature, it becomes white (crystallized) and cannot be stretched.
　耐熱ボトルを製造する際は上述の特性を活かし、プリフォームが完全に白化する前にブローしてボトルを成形する必要がある。これは完全に白化する前にブローするのは、完全に白化すると空気を入れても延伸せずペットボトル製品にできないからである。 When manufacturing a heat-resistant bottle, it is necessary to take advantage of the above-mentioned characteristics and blow the bottle before the preform completely whitens to form the bottle. The reason for blowing before completely whitening is that, when completely whitened, it cannot be made into a PET bottle product without stretching even when air is introduced.
　また、耐熱温度を上げるためには、プリフォームの加熱温度及びブロー成形時の金型温度が高ければ高いほど良い。出来上がった耐熱ペットボトルが白化（結晶化）に近づけば樹脂自体が固くなるので、高温の液体を入れても変形しにくくなるからである。このような理由で、耐熱ペットボトルは、通常常温において使用するペットボトルよりも外見上白味がかっている。 In order to increase the heat resistant temperature, the higher the heating temperature of the preform and the mold temperature during blow molding, the better. This is because the resin itself becomes harder when the finished heat-resistant PET bottle approaches whitening (crystallization), so that it becomes difficult to deform even when a high-temperature liquid is introduced. For this reason, heat-resistant plastic bottles have a whiter appearance than plastic bottles that are usually used at room temperature.
　しかしながら、プリフォームの外側から内側まで高温の熱を浸透させるのは難しく、従来は外側の熱が内側に伝わる前に外側の白化が進み、ブロー成形でペットボトル形状まで膨らますことができなかったり、若しくはプリフォーム外側の白化を避けるために白化寸前までプリフォームを加熱できないという理由で、耐熱温度が低いボトルしか成形できなかったりという問題が発生していた。 However, it is difficult to infiltrate high-temperature heat from the outside to the inside of the preform, and in the past, the outer whitening progressed before the outer heat was transmitted to the inside, and it was not possible to expand to the PET bottle shape by blow molding, Alternatively, there has been a problem that only a bottle having a low heat-resistant temperature can be molded because the preform cannot be heated to just before whitening in order to avoid whitening on the outside of the preform.
　このような問題があるため、従来においては、耐熱ボトル製造の際は、常温ボトル製造とは異なる工程を踏むような複雑な製造工程を踏まなければならず、この工程を簡略化させることが求められていた。 Due to such a problem, conventionally, when manufacturing a heat-resistant bottle, it is necessary to take a complicated manufacturing process such as performing a process different from the normal temperature bottle manufacturing, and it is necessary to simplify this process. Had been.
　本発明の目的は、どのような種類のペットボトルであっても加熱部を必要最短にすることにより余分な時間をかけずに良質なペットボトルを効率良く安定して製造できると共に、全体の大きさが大型化することなく限られた設置スペースであってもより省スペース設計のペットボトル製造装置を提供することにある。これに加えて、ペットボトルが耐熱ペットボトルの場合、複雑な工程を踏まずに製造できるようにするペットボトル製造装置を提供することにある。 The object of the present invention is to make it possible to efficiently and stably produce a high-quality PET bottle without taking extra time by making the heating section as short as possible for any type of PET bottle, and to reduce the overall size. An object of the present invention is to provide a PET bottle manufacturing apparatus that is designed to save space even in a limited installation space without increasing the size. In addition to this, it is an object of the present invention to provide a PET bottle manufacturing apparatus that can manufacture a PET bottle without a complicated process when the PET bottle is a heat-resistant PET bottle.
　上述した課題を解決するために、本発明の請求項１に係るペットボトル製造装置は、
　ブロー成形によりペットボトルを製造するペットボトル製造装置において、
　前記ペットボトル製造装置は、
　ペットボトルとしてブロー成形されるプリフォームを所定の間隔で順々に搬送する搬送ラインと、
　前記搬送ラインの上流側に設けられ前記プリフォームを前記搬送ラインに投入するプリフォーム投入部と、
　前記搬送ラインの下流側に設けられ、前記ペットボトル製造装置によって製造されたペットボトルを取り出すペットボトル取り出し部と、
　前記ペットボトル取り出し部よりも前記搬送ラインの上流側に設けられたブロー成形部と、
　前記搬送ラインにおいて前記プリフォーム投入部と前記ブロー成形部との間に設けられ、前記プリフォームを当該ブロー成形部でブロー成形するために必要な加熱を前記プリフォームに対して前記搬送ラインの所定の区間に亘って行うプリフォーム加熱部と、
　前記プリフォーム加熱部から前記ブロー成形部に至るまでの所定箇所において当該プリフォームに風を当てるプリフォーム風当て部と、
　前記プリフォームを前記搬送ラインの一定区間に亘って加熱している間及び風を当てている間、当該プリフォームをその軸芯周りに回転させる回転装置と、を有することを特徴としている。 In order to solve the above-mentioned problem, a PET bottle manufacturing apparatus according to claim 1 of the present invention is provided.
In a PET bottle manufacturing device that manufactures PET bottles by blow molding,
The PET bottle manufacturing device,
A transport line for sequentially transporting preforms blow molded as PET bottles at predetermined intervals,
A preform loading unit that is provided upstream of the transport line and that loads the preform into the transport line;
A PET bottle removal unit provided on the downstream side of the transport line and for removing a PET bottle manufactured by the PET bottle manufacturing apparatus,
A blow molding unit provided on the upstream side of the transport line from the PET bottle removal unit,
The transfer line is provided between the preform input section and the blow molding section, and heat required for blow molding the preform in the blow molding section is applied to the preform by a predetermined amount in the transfer line. A preform heating section performed over a section of
A preform wind application unit that applies air to the preform at a predetermined position from the preform heating unit to the blow molding unit,
A rotating device configured to rotate the preform around its axis while heating the preform over a certain section of the transport line and applying wind.
　また、本発明の請求項２に係るペットボトル製造装置は、請求項１に記載のペットボトル製造装置において、
　前記プリフォーム風当て部は、前記プリフォーム加熱部によって前記プリフォームが加熱される過程の少なくとも一部において当該プリフォームに風を当てるように設けられていることを特徴としている。 Further, the PET bottle manufacturing apparatus according to claim 2 of the present invention is the PET bottle manufacturing apparatus according to claim 1,
The preform wind application section is provided so as to apply air to the preform in at least a part of a process of heating the preform by the preform heating section.
　また、本発明の請求項３に係るペットボトル製造装置は、請求項２に記載のペットボトル製造装置において、
　前記プリフォーム風当て部には、前記プリフォームの所定の部分に集中して風を当てる風当てスリットガイドが備わることを特徴としている。 The PET bottle manufacturing apparatus according to claim 3 of the present invention is the PET bottle manufacturing apparatus according to claim 2,
The preform wind application unit is characterized in that a wind application slit guide for applying air to a predetermined portion of the preform is provided.
　また、本発明の請求項４に係るペットボトル製造装置は、請求項１に記載のペットボトル製造装置において、
　前記プリフォーム風当て部は、前記プリフォーム加熱部でプリフォームを加熱してからブロー成形部に入るまでの間の所定位置に設けられていることを特徴としている Further, the PET bottle manufacturing apparatus according to claim 4 of the present invention is the PET bottle manufacturing apparatus according to claim 1,
The preform wind application unit is characterized in that it is provided at a predetermined position before heating the preform in the preform heating unit and before entering the blow molding unit.
　また、本発明の請求項５に係るペットボトル製造装置は、請求項１乃至請求項４の何れかに記載のペットボトル製造装置において、
　ウォーターサーバー用ペットガロンボトルにブロー成形可能なプリフォームを前記プリフォーム投入部に投入可能なことを特徴としている。 Further, the PET bottle manufacturing apparatus according to claim 5 of the present invention is the PET bottle manufacturing apparatus according to any one of claims 1 to 4,
It is characterized in that a preform that can be blow-molded into a PET gallon bottle for a water server can be charged into the preform charging section.
　また、本発明の請求項６に係るペットボトル製造装置は、請求項１乃至請求項４の何れかに記載のペットボトル製造装置において、
　略一定の直径を有するペットボトルとは異なる異形形状の特別な形態を有するペットボトルにブロー成形可能なプリフォームを前記プリフォーム投入部に投入可能なことを特徴としている。 The PET bottle manufacturing apparatus according to claim 6 of the present invention is the PET bottle manufacturing apparatus according to any one of claims 1 to 4,
The present invention is characterized in that a preform that can be blow-molded into a specially shaped plastic bottle different in shape from a plastic bottle having a substantially constant diameter can be charged into the preform charging section.
　また、本発明の請求項７に係るペットボトル製造装置は、請求項１乃至請求項６の何れかに記載のペットボトル製造装置において、
　前記ペットボトル製造装置によるペットボトルの大量生産を可能とするために、前記ブロー成形部が一度に複数本のペットボトルをブロー成形可能な構造となっていることを特徴としている。 Further, a plastic bottle manufacturing apparatus according to claim 7 of the present invention is the plastic bottle manufacturing apparatus according to any one of claims 1 to 6,
In order to enable the PET bottle manufacturing apparatus to mass-produce PET bottles, the blow molding section has a structure capable of blow molding a plurality of PET bottles at a time.
　また、本発明の請求項８に係るペットボトル製造装置は、請求項１乃至請求項７の何れかに記載のペットボトル製造装置において、
　前記ペットボトル製造装置が耐熱性ペットボトルを製造可能であることを特徴としている。 Further, the plastic bottle manufacturing apparatus according to claim 8 of the present invention is the plastic bottle manufacturing apparatus according to any one of claims 1 to 7,
The PET bottle manufacturing apparatus is capable of manufacturing a heat-resistant PET bottle.
　また、本発明の請求項９に係るペットボトル製造装置は、請求項１乃至請求項８の何れかに記載のペットボトル製造装置において、
　前記ポリエチレンテレフタレートでできたプリフォームに代えて、加熱過程において結晶化現象が生じる場合のあるプリフォームを前記プリフォーム投入部に投入可能なことを特徴としている。 Further, the PET bottle manufacturing apparatus according to claim 9 of the present invention is the PET bottle manufacturing apparatus according to any one of claims 1 to 8,
Instead of the preform made of polyethylene terephthalate, a preform in which a crystallization phenomenon may occur in the heating process can be put into the preform feeding section.
　本発明によると、どのような種類のペットボトルであっても加熱部を必要最短にすることにより余分な時間をかけずに良質なペットボトルを効率良く安定して製造できると共に、全体の大きさが大型化することなく限られた設置スペースであってもより省スペース設計のペットボトル製造装置を提供することができる。これに加えて、ペットボトルが耐熱ペットボトルの場合、複雑な工程を踏まずに製造できるようにするペットボトル製造装置を提供することができる。 According to the present invention, a high-quality PET bottle can be efficiently and stably manufactured without extra time by making the heating section as short as possible for any type of PET bottle, and the overall size is reduced. Can provide a PET bottle manufacturing apparatus with a more space-saving design even in a limited installation space without increasing the size. In addition, when the PET bottle is a heat-resistant PET bottle, it is possible to provide a PET bottle manufacturing apparatus that can manufacture the PET bottle without complicated steps.
本発明の第１の実施形態に係るペットボトル製造装置の構成を概略的に示す平面図である。It is a top view showing roughly composition of a plastic bottle manufacturing device concerning a 1st embodiment of the present invention. 図１に示すペットボトル製造装置の加熱部及び風当て部の間を通過するプリフォームとマンドルを搬送ラインの上流側から見た概略図である。FIG. 2 is a schematic view of a preform and a mandrel passing between a heating unit and a wind application unit of the PET bottle manufacturing apparatus shown in FIG. 1 as viewed from an upstream side of a transport line. 図２におけるプリフォームへの加熱部からの加熱状態及び風当て部からの風当て状態を示す説明図である。It is explanatory drawing which shows the heating state from the heating part with respect to the preform in FIG. 2, and the blowing state from the blowing part. 図３に示したプリフォームへの加熱部からの加熱状態及び風当て部からの風当て状態を図２に対応して示す説明図である。FIG. 4 is an explanatory diagram corresponding to FIG. 2, showing a heating state of a preform shown in FIG. 3 from a heating unit and a blowing state from a blowing unit. 本発明の第２の実施形態に係るペットボトル製造装置の構成を概略的に示す平面図である。It is a top view showing roughly composition of a plastic bottle manufacturing device concerning a 2nd embodiment of the present invention.
　続いて、本発明の第１の実施形態に係るペットボトル製造装置１の構成について説明する。なお、このペットボトル製造装置１は、射出成形機で成形してから取り出したプリフォームをブロー成形機で再加熱してペットボトルを製造するタイプの製造装置である。 Next, the configuration of the PET bottle manufacturing apparatus 1 according to the first embodiment of the present invention will be described. The PET bottle manufacturing apparatus 1 is a type of manufacturing apparatus for manufacturing a PET bottle by reheating a preform taken out after being molded by an injection molding machine by a blow molding machine.
　以下、本発明の第１の実施形態に係る（以下適宜単に「本実施形態」又は「実施形態」とする）ペットボトル製造装置１を図面に基づいて詳細に説明する。図１は、本発明の第１の実施形態に係るペットボトル製造装置１の構成を概略的に示す平面図である。また、図２は、図１に示すペットボトル製造装置１の加熱部及び風当て部の間を通過するプリフォーム２０とマンドル１００を搬送ライン２００の上流側から見た概略図である。また、図３は、図２におけるプリフォーム２０への加熱部からの加熱状態及び風当て部からの風当て状態を示す説明図である。また、図４は、図３に示したプリフォーム２０への加熱部からの加熱状態及び風当て部からの風当て状態を図２に対応して示す説明図である。なお、図１において発明の理解の容易化と図示の簡略化のためにマンドル１００の数を少なめに描いたが、実際にはペットボトル製造装置１の大きさによって異なるが図示する数よりも多くの数のマンドル１００が互いに所定の間隔で搬送ライン２００によって搬送されている。 Hereinafter, the PET bottle manufacturing apparatus 1 according to the first embodiment of the present invention (hereinafter simply referred to as “this embodiment” or “embodiment” as appropriate) will be described in detail with reference to the drawings. FIG. 1 is a plan view schematically showing a configuration of a plastic bottle manufacturing apparatus 1 according to the first embodiment of the present invention. FIG. 2 is a schematic view of the preform 20 and the mandrel 100 passing between the heating unit and the air blowing unit of the PET bottle manufacturing apparatus 1 shown in FIG. FIG. 3 is an explanatory diagram showing a state of heating the preform 20 from the heating unit and a state of blowing the preform 20 from the blowing unit in FIG. FIG. 4 is an explanatory view corresponding to FIG. 2 showing a state of heating the preform 20 shown in FIG. 3 from the heating unit and a state of blowing the preform 20 from the blowing unit. In FIG. 1, the number of mandrels 100 is illustrated to be small for easy understanding of the invention and for simplification of the illustration, but actually differs depending on the size of the PET bottle manufacturing apparatus 1, but is larger than the number illustrated. Are transferred by the transfer line 200 at predetermined intervals.
　本実施形態に係るペットボトル製造装置１（以下単に「ペットボトル製造装置１」とする）は、ブロー成形によりペットボトル３０を製造するペットボトル製造装置であって、設置状態で上面が水平となる基台１１と、基台１１の上面に設置されマンドル１００に乗せられたプリフォーム２０を所定間隔で順次搬送していく搬送ライン２００と、搬送ライン２００のマンドル１００にプリフォーム２０を順次投入するプリフォーム投入部３００と、プリフォーム投入部３００に投入され搬送ライン２００によって送られてくるプリフォーム２０を順次加熱するプリフォーム加熱部４００と、プリフォーム加熱部４００に対向配置されたプリフォーム風当て部５００と、プリフォーム加熱部４００において加熱され搬送ライン２００によって送られてくるプリフォーム２０を順次ブロー成形するブロー成形部６００と、ブロー成形部６００によってブロー成形されプリフォーム２０から製品として製造され搬送ライン２００によって送られてくるペットボトル３０を順次取り出すペットボトル取り出し部７００を有している。 The PET bottle manufacturing apparatus 1 according to the present embodiment (hereinafter, simply referred to as “PET bottle manufacturing apparatus 1”) is a PET bottle manufacturing apparatus that manufactures a PET bottle 30 by blow molding, and the upper surface is horizontal in an installed state. The base 11, a transport line 200 for sequentially transporting the preforms 20 placed on the mandrel 100 on the upper surface of the base 11 at predetermined intervals, and the preforms 20 are sequentially put into the mandrel 100 of the transport line 200. A preform charging unit 300, a preform heating unit 400 that sequentially heats the preforms 20 that are charged into the preform charging unit 300 and sent by the transport line 200, and a preform wind that is disposed to face the preform heating unit 400. The contacting section 500 and the preform heating section 400 heat the heating section 400 so that Blow molding section 600 for sequentially blow molding the preforms 20 to be taken, and PET bottle removal for sequentially taking out the PET bottles 30 which are blow molded by the blow molding section 600, are manufactured as products from the preforms 20, and are sent by the transport line 200. It has a part 700.
　なお、プリフォーム加熱部４００とプリフォーム風当て部５００が配置された部分には加熱空気排気部８００が備わっている。また、プリフォーム加熱部４００とブロー成形部６００との間の搬送ライン２００の近傍にはトランジット風当て部９００が設けられている。 加熱 A heated air exhaust unit 800 is provided in a portion where the preform heating unit 400 and the preform air contact unit 500 are arranged. In addition, a transit air application unit 900 is provided near the transfer line 200 between the preform heating unit 400 and the blow molding unit 600.
　以下の説明において、プリフォーム投入部３００とこれに対応する搬送ライン２００の一部をプリフォーム投入ステーション、プリフォーム加熱部４００及びプリフォーム風当て部５００とこれに挟まれた搬送ライン２００の一部をプリフォーム加熱・風当てステーション、プリフォーム２０をブロー成形するブロー成形部６００とこれに対応する搬送ライン２００の一部をプリフォームブロー成形ステーション、トランジット風当て部９００とこれに対応する搬送ライン２００の一部をトランジットステーションと適宜呼ぶものとする。 In the following description, the preform loading section 300 and a part of the corresponding transport line 200 are referred to as a preform loading station, a preform heating section 400 and a preform wind application section 500, and the transport line 200 sandwiched therebetween. The part is a preform heating / blowing station, the blow molding part 600 for blow molding the preform 20 and a part of the corresponding transport line 200 are a preform blow molding station, the transit wind blowing part 900 and the corresponding transport. A part of the line 200 is appropriately called a transit station.
　搬送ライン２００は、図１に示すように、平面視トラック形状を有し、プリフォーム２０及びペットボトル３０をそれぞれ倒立状態で保持しながら移動するマンドル１００が所定の間隔で配置され、所定の移動速度で図中反時計回りに移動するようになっている。なお、本実施形態における搬送ラインの形状やマンドルの移動方向については、本発明のあくまで一例を示したものに過ぎず、図1の搬送ラインは一例に過ぎない。即ち、搬送ラインが平面視トラック形状以外の形状の場合も当然考えられ、同じくマンドルの移動方向が図中時計回り場合もあることは言うまでもない。 As shown in FIG. 1, the transport line 200 has a track shape in a plan view, and the mandrel 100 that moves while holding the preform 20 and the plastic bottle 30 in an inverted state is arranged at a predetermined interval. It moves counterclockwise in the figure at the speed. Note that the shape of the transfer line and the direction of movement of the mandrel in the present embodiment are merely examples of the present invention, and the transfer line in FIG. 1 is merely an example. That is, it is naturally conceivable that the transport line has a shape other than the track shape in plan view, and it goes without saying that the mandrel may move in the clockwise direction in the drawing.
　なお、搬送ライン２００は、プリフォーム投入部３００からブロー成形部６００までがプリフォーム搬送ライン区間２１０（図中マンドル１００を示す二重丸の内側の円のみハッチングが施されている区間）、ブロー成形部６００からペットボトル取り出し部７００までがペットボトル搬送ライン区間２２０（図中マンドル１００を示す二重丸の全体にハッチングが施されている区間）、ペットボトル取り出し部７００からプリフォーム投入部３００までが空マンドル搬送ライン区間２３０（図中マンドル１００を示す二重丸の全体にハッチングが施されていない区間）の３区間から構成されている。 The transfer line 200 includes a preform transfer line section 210 (a section where only the circle inside the double circle indicating the mandrel 100 in the figure is hatched) from the preform input section 300 to the blow molding section 600, and blow molding. The section from the section 600 to the PET bottle removal section 700 is a PET bottle transport line section 220 (section where the entire double circle indicating the mandrel 100 in the figure is hatched), and the section from the PET bottle removal section 700 to the preform loading section 300. Are composed of three sections of an empty mandrel transfer line section 230 (a section in which the double circle indicating the mandrel 100 in the figure is not hatched).
　そして、プリフォーム加熱部４００とプリフォーム風当て部５００との間で規定される搬送ライン２００及びトランジット風当て部近傍の搬送ライン２００の下側には回転装置２５０が備わっている。 {Circle around (2)} A rotating device 250 is provided below the transport line 200 defined between the preform heating unit 400 and the preform wind application unit 500 and the transport line 200 near the transit wind application unit.
　回転装置２５０は、プリフォーム加熱・風当てステーションにおいてプリフォーム２０を搬送ライン２００の一定区間に亘って加熱している間、及びトランジットステーションの双方においてマンドル１００を回転させることでプリフォーム２０をその軸芯周りに回転させるようなっている。 The rotating device 250 rotates the preform 20 by rotating the mandrel 100 while heating the preform 20 over a certain section of the transport line 200 at the preform heating / blowing station, and at both the transit station. It is designed to rotate around the axis.
　マンドル１００は、図２に示すように、ハウジング１１０と、ハウジング１１０に着脱可能に固定された口部装着部１２０からなる。 As shown in FIG. 2, the mandrel 100 includes a housing 110 and a mouth mounting portion 120 detachably fixed to the housing 110.
　口部装着部１２０は、プリフォーム２０の口部２１に挿入されて両者がしっかりと嵌まり合い、プリフォーム２０及びブロー成形後のペットボトル３０を垂直に倒立させた状態を保ちながらマンドル１００上で保持するようになっている。 The mouth mounting portion 120 is inserted into the mouth portion 21 of the preform 20 so that the two fit tightly, and the preform 20 and the plastic bottle 30 after blow molding are vertically inverted while the mandrel 100 is kept on the mandrel 100. It is designed to hold it.
　なお、マンドル１００の下側には加熱・風当てステーション及びトランジットステーションに設けられた回転装置と連動してマンドル１００自体を回転させる回転連結部１３０が備わっている。 回 転 Below the mandrel 100, there is provided a rotary connecting portion 130 for rotating the mandrel 100 itself in conjunction with a rotating device provided in the heating / winding station and the transit station.
　プリフォーム投入部３００は、搬送ライン上の空マンドル１００がプリフォーム投入ステーションに達した時に空マンドル１００の口部装着部１２０にプリフォーム２０の口部２１を嵌め込んで、プリフォーム２０をマンドル１００に倒立状態にしたまま次なる加熱・風当てステーションに多数のプリフォーム２０を順次供給する役目を果たしている。なお、プリフォーム投入部３００には、専用の投入装置や直交座標型のロボット等、様々な公知の装置が用いられている。 When the empty mandrel 100 on the transport line reaches the preform loading station, the preform loading section 300 fits the opening 21 of the preform 20 into the opening mounting section 120 of the empty mandrel 100, and puts the preform 20 into the mandrel 100. It plays a role of sequentially supplying a large number of preforms 20 to the next heating / blowing station in an inverted state. Various known devices such as a dedicated loading device and a robot of a rectangular coordinate type are used for the preform loading unit 300.
　プリフォーム加熱部４００は、搬送ライン２００の一定区間を占める加熱・風当てステーションの搬送ライン２００に対して一方の側に設けられている。プリフォーム加熱部４００は、図１においては搬送ライン２００の手前側に亘って水平方向に延在する一定長さのヒーター４１１，４１２，４１３，４１４，４１５，４１６（４１０）を図２に実線で示すように垂直方向に所定の間隔で複数本（本実施形態では発明の理解及び図示の容易化のために少なめの本数である６本）配置した構成を有している。なお、最下段のヒーター４１１の配置高さは、マンドル１００に乗せられ加熱・風当てステーションを通過するプリフォーム２０の口部２１を除いたその近傍をブロー成形により膨らませる加熱量を加えるのに適した高さとなっている。なお、実際にはヒーターの数はペットボトル製造装置の機種により異なっており、通常例えば１０本以上等、本実施形態よりも多い本数のヒーターが所定の間隔で配置され、高さの異なるプリフォームの加熱に対応できるようになっている。 The preform heating unit 400 is provided on one side of the conveying line 200 of the heating / blowing station occupying a certain section of the conveying line 200. In FIG. 1, the preform heating unit 400 includes heaters 411, 412, 413, 414, 415, and 416 (410) each extending in a horizontal direction across the front side of the transport line 200 and a solid line in FIG. As shown in the figure, a plurality (six in this embodiment, which is a small number for ease of understanding and illustration of the present invention) are arranged at predetermined intervals in the vertical direction. In addition, the arrangement height of the heater 411 in the lowermost stage is determined by adding a heating amount that expands the vicinity of the preform 20 except for the mouth portion 21 that is placed on the mandrel 100 and passes through the heating / blowing station by blow molding. It has a suitable height. In practice, the number of heaters differs depending on the model of the PET bottle manufacturing apparatus. Usually, for example, more than 10 heaters, such as more than 10 heaters, are arranged at predetermined intervals, and preforms having different heights are used. Can be heated.
　また、各ヒーター４１０の裏側には加熱部内風当て部４２０が備わっている。加熱部内風当て部４２０は、ファンやブロアから構成され、各ヒーター４１０において加熱された空気がヒーター内に篭ることなく（留まることなく）、加熱・風当てステーション内のプリフォーム２０を効率的に加熱する役目を果たしている（図４の右から左に向かう細い波線の矢印参照）。 In addition, a heating unit internal wind contact unit 420 is provided on the back side of each heater 410. The heating unit internal wind application unit 420 is configured by a fan or a blower, and efficiently heats the preform 20 in the heating / air application station without the air heated in each heater 410 staying in the heater (without stopping). It serves to heat (see the thin wavy arrow from right to left in FIG. 4).
　プリフォーム加熱部４００が各プリフォーム２０を加熱する加熱量は、ヒーター調整により高めに設定できる。プリフォーム風当て部５００を作動させないとプリフォーム２０の少なくとも一部が白化（結晶化）するが、プリフォーム風当て部５００を作動させると、高温加熱でもこのような白化（結晶化）が生じない加熱量にすることができる。即ち、プリフォーム風当て部５００を有さない従来のペットボトル製造装置に比べて加熱・風当てステーション内の搬送ライン２００において各プリフォーム２０あたりの加熱量をその分多くすることができる。 加熱 The amount of heating by which the preform heating section 400 heats each preform 20 can be set higher by adjusting the heater. At least a portion of the preform 20 is whitened (crystallized) when the preform wind application unit 500 is not operated. However, when the preform air application unit 500 is operated, such whitening (crystallization) occurs even at high temperature heating. There can be no heating amount. That is, the heating amount per each preform 20 in the transport line 200 in the heating / air blowing station can be increased by that amount, as compared with a conventional PET bottle manufacturing apparatus having no preform air blowing section 500.
　プリフォーム風当て部５００は、搬送ライン２００の一定区間を占める加熱・風当てステーションの搬送ライン２００に対してプリフォーム加熱部４００の他方の側に設けられている。そして、プリフォーム風当て部５００は、ここでは詳細には図示しないが、ファン、ブロア、コンプレッサー等の送風機５１０と、送風機５１０によって送風された空気の流れをプリフォーム全体に局所的に当たるようにするための風当てスリットガイド５２０を有している。 The preform blowing unit 500 is provided on the other side of the preform heating unit 400 with respect to the transport line 200 of the heating and blowing station that occupies a certain section of the transport line 200. Although not shown here in detail, the preform blowing section 500 causes a blower 510 such as a fan, a blower, or a compressor, and a flow of air blown by the blower 510 to locally hit the entire preform. Has a wind application slit guide 520 for the purpose.
　風当てスリットガイド５２０は、図３に示すように、複数枚の仕切り板５２１～５２７を互いに所定の間隔で同一方向に向かうように配置されている。そして、送風機５１０から送風された空気が風当てスリットガイド５２０をなすそれぞれの仕切り板５２１～５２７の間を通って整流され、各スリットガイドからプリフォーム全体に局所的に吹き付けられるようになっている（図３における風当てスリットガイド５２０間に示す白抜きの矢印及び図４における風当てスリットガイド５２０に示す左側から右側に向かう白抜きの矢印参照）。 (3) As shown in FIG. 3, the wind contact slit guide 520 is arranged such that a plurality of partition plates 521 to 527 face each other at a predetermined interval in the same direction. Then, the air blown from the blower 510 is regulated between the partition plates 521 to 527 forming the wind application slit guide 520, and is locally blown from the slit guide to the entire preform. (Refer to the white arrows shown between the wind contact slit guides 520 in FIG. 3 and the white arrows from left to right shown in the wind contact slit guide 520 in FIG. 4).
　なお、本実施形態では発明の理解及び図示の容易化のために風当てスリット同士の間隔が広く風当てスリットの枚数も少なめとなっているが、実際にはこのような形態に限定されるものではなく、プリフォームへの風当ての効果を勘案してより多くの風当てスリットガイドを設けている。 In the present embodiment, the spacing between the wind application slits is wide and the number of the air application slits is small for easy understanding and illustration of the invention. However, the present invention is not limited to such an embodiment. Instead, more wind guide slits are provided in consideration of the effect of the wind on the preform.
　即ち、風当てスリットガイド５２０を介して各プリフォーム２０に向かって吹き出した空気が、ヒーターによって加熱され、搬送ライン２００上を軸芯周りに回転しながら移動していくプリフォーム２０の全体に吹きかかるようになっている。これによって、各ヒーター４１０によって熱せられたプリフォーム２０の表面の急激な温度上昇に基づく白化現象（結晶化現象）の発生を抑える役目をし、また、プリフォーム内外面の温度差を縮めることによりボトル成形に最適なプリフォーム状態にすることが出来る。 That is, the air blown out toward each preform 20 via the wind application slit guide 520 is heated by the heater and blows over the entire preform 20 moving on the transport line 200 while rotating around the axis. This is the case. This serves to suppress the occurrence of a whitening phenomenon (crystallization phenomenon) based on a rapid rise in the temperature of the surface of the preform 20 heated by each heater 410, and to reduce the temperature difference between the inner and outer surfaces of the preform. It is possible to make the preform state optimal for bottle molding.
　プリフォーム風当て部５００による各プリフォーム２０への風当て量は、プリフォーム風当て部５００を作動させないとプリフォーム加熱部４００からの高温加熱によりプリフォーム２０の少なくとも一部が白化（結晶化）するが、プリフォーム風当て部５００を作動させると、高温加熱でもこのような白化（結晶化）が生じないように風当て量を調整できる。 The amount of air applied to each preform 20 by the preform air application unit 500 is such that at least a portion of the preform 20 is whitened (crystallized) by high-temperature heating from the preform heating unit 400 unless the preform air application unit 500 is operated. However, by operating the preform blowing unit 500, the amount of blowing can be adjusted so that such whitening (crystallization) does not occur even with high-temperature heating.
　なお、プリフォーム風当て部５００は、本実施形態においては自動インバータ制御を行っていない。この理由は、自動インバータ制御を行うと、プリフォーム加熱部４００内の温度によって自動的にモーターが制御され風量が変わってしまい、加熱されるプリフォーム２０の表面温度もまちまちになってしまうためである。そのため、本実施形態においては、プリフォーム２０に当てる風の強弱調整については手動でもできるようにして、同じロットのプリフォーム２０を加熱しながら風を当てる際に必ず同じ風量となるように条件を揃えている。しかしながら、本発明の作用を十分に発揮し得る範囲内であれば、この実施形態以外の制御方法で加熱中のプリフォーム２０に風当てを行っても良い。 Note that, in the present embodiment, the preform wind application unit 500 does not perform automatic inverter control. The reason is that when the automatic inverter control is performed, the motor is automatically controlled by the temperature in the preform heating unit 400, the air volume changes, and the surface temperature of the preform 20 to be heated also varies. is there. For this reason, in the present embodiment, the strength of the wind applied to the preform 20 can be manually adjusted, and conditions must be set such that the same air volume is always obtained when the wind is applied while heating the preforms 20 of the same lot. I have it. However, as long as the effects of the present invention can be sufficiently exerted, the preform 20 being heated may be blown by a control method other than the embodiment.
　加熱空気排気部８００は、プリフォーム加熱部４００とプリフォーム風当て部５００との間の空間の上方に設置されている。加熱空気排気部８００は、加熱・風当てステーションにおいて生じるプリフォーム２０を加熱した後の空気を全体的に吸い込んで外部に排出する役目を果たしている（図４において加熱空気排気部８００に向かう湾曲した上向きの矢印参照）。 The heated air exhaust unit 800 is installed above the space between the preform heating unit 400 and the preform air contact unit 500. The heated air exhaust unit 800 serves to entirely inhale and exhaust the air after heating the preform 20 generated in the heating and blowing station (curved toward the heated air exhaust unit 800 in FIG. 4). See upward arrow).
　なお、本実施形態においては、上述したようにプリフォーム２０の口部２１（ブロー成形後のペットボトル３０の飲み口部）が下向きであるため、加熱空気排気部８００は、プリフォーム加熱部４００とプリフォーム風当て部５００との間の空間の上方に設置されている。しかしながら、ペットボトル製造装置１の構造に応じてプリフォーム２０の口部２１（ブロー成形後のペットボトル３０の飲み口部）が上向きの形態となる場合、加熱された空気がプリフォーム２０の口部２１に当たらないように加熱後の空気を下側に排出するように加熱空気排気部８００を加熱・風当てステーションに設置する場合がある。 In the present embodiment, since the mouth 21 of the preform 20 (the spout of the PET bottle 30 after blow molding) faces downward as described above, the heated air exhaust unit 800 is connected to the preform heating unit 400. It is installed above a space between the preform wind application section 500 and the preform wind application section 500. However, when the mouth 21 of the preform 20 (the spout of the PET bottle 30 after blow molding) is directed upward according to the structure of the PET bottle manufacturing apparatus 1, the heated air flows through the mouth of the preform 20. There is a case where the heated air exhaust unit 800 is installed in the heating / blowing station so that the heated air is discharged downward so as not to hit the unit 21.
　トランジット風当て部９００は、加熱・風当てステーションからブロー成形ステーションに入るまでの待機位置、即ち１つ先のマンドル１００に取り付けられたプリフォーム２０がブロー成形部６００でブロー成形されている間、マンドル１００ごと留まっている位置としてのトランジットステーションに設けられ、加熱・風当てステーションから加熱されて出てきてブロー成形部６００の金型６１１，６１２（６１０）に入る直前のプリフォーム２０に更に風を当てる役目を果たしている。なお、トランジット風当て部９００は、プリフォーム風当て部５００と同様にファンやブロア、コンプレッサー等の適当な風当て装置が用いられている。 The transit wind application unit 900 is in a standby position before entering the blow molding station from the heating and air application station, that is, while the preform 20 attached to the next mandrel 100 is being blow molded by the blow molding unit 600. The preform 20 is provided at the transit station where the entire mandrel 100 stays, and is heated from the heating / winding station to exit the preform 20 immediately before entering the molds 611, 612 (610) of the blow molding section 600. Plays the role of guessing. The transit wind application unit 900 uses an appropriate air application device such as a fan, a blower, or a compressor, similarly to the preform air application unit 500.
　トランジットステーションでもプリフォーム２０の中に熱が浸透し、白化現象（結晶化現象）が進むことが懸念されるため、ブロー成形される直前のプリフォーム２０の結晶化状態に応じてトランジット風当て部９００における風当てを行うか行わないかを決定する。即ち、トランジットステーションでプリフォーム２０が白化（結晶化）することがないのが明らかな場合においては、このトランジット風当て部９００を作動させる必要は無い。 At the transit station, heat may penetrate into the preform 20, and there is a concern that the whitening phenomenon (crystallization phenomenon) may progress. Therefore, the transit air contact portion may be used in accordance with the crystallization state of the preform 20 immediately before blow molding. A determination is made whether to apply the wind at 900. That is, when it is clear that the preform 20 will not be whitened (crystallized) at the transit station, there is no need to operate the transit wind application unit 900.
　なお、図１においてはプリフォーム加熱部４００及びプリフォーム風当て部５００とブロー成形部６００との間の搬送ライン２００の近傍の一部であってプリフォーム２０がブロー成形前に一時待機する位置にトランジット風当て部９００が設けられているが、搬送ライン２００に沿ってその近傍に全体的に設けられていても良い。 In FIG. 1, a part of the vicinity of the conveying line 200 between the preform heating unit 400 and the preform blowing unit 500 and the blow molding unit 600 and a position where the preform 20 temporarily waits before the blow molding. Although the transit wind contact portion 900 is provided in the vicinity, the transit wind contact portion 900 may be provided entirely along the transport line 200 and in the vicinity thereof.
　ブロー成形部６００は、搬送ライン２００を跨ぐように備わっている。そして、ブロー成形前のプリフォーム２０が搬送ライン２００の上流側からマンドル１００に取り付けられて移動してくる際には、図１に示すように金型６１０の半部６１１，６１２同士が互いに離間して開放状態となってペットボトル成形ステーションにマンドル１００及びこれに嵌め込まれたプリフォーム２０が規定通り位置決めされて停止するようになっている。そして、これらの停止後に金型６１０の半部６１１，６１２同士が互いに当接して閉塞状態となり、ブロー成形用金型６１０を構成する。そして、この状態でブロー成形を行いプリフォーム２０からペットボトル３０に成形した後、再び金型６１０の半部６１１，６１２同士が互いに離間して開放状態となり、ブロー成形後のペットボトル３０をマンドル１００ごとペットボトル取り出し部７００に向かって移動させるようになっている。 The blow molding section 600 is provided so as to straddle the transport line 200. When the preform 20 before blow molding is attached to the mandrel 100 from the upstream side of the transfer line 200 and moves, the halves 611 and 612 of the mold 610 are separated from each other as shown in FIG. Then, the mandrel 100 and the preform 20 fitted into the mandrel 100 are positioned and stopped as specified in the PET bottle forming station. Then, after these stops, the halves 611 and 612 of the mold 610 come into contact with each other to be in a closed state, thereby forming the blow molding mold 610. Then, after performing blow molding in this state to form the PET bottle 30 from the preform 20, the half portions 611 and 612 of the mold 610 are separated from each other again to be in an open state, and the PET bottle 30 after blow molding is removed from the mandrel. Each 100 is moved toward the PET bottle removal unit 700.
　ペットボトル取り出し部７００は、プリフォーム投入部３００とは逆にブロー成形部６００においてペットボトル３０として成形されマンドル１００に取り付けたまま搬送ライン２００を移動してくるペットボトル３０をペットボトル取り出しステーションにおいて製品として取り出す役目を果たしている。なお、ペットボトル取り出し部７００には、プリフォーム投入部３００と同様に、専用の取り出し装置や直交座標型のロボット等、様々な公知の装置が用いられている。 The PET bottle removal unit 700 is configured to remove the PET bottle 30 that is formed as the PET bottle 30 in the blow molding unit 600 and moves on the transport line 200 while being attached to the mandrel 100, at the PET bottle removal station. It plays the role of taking it out as a product. As the PET bottle removal unit 700, various known devices such as a dedicated removal device and an orthogonal coordinate type robot are used similarly to the preform loading unit 300.
　基台１１には上述した本実施形態に係るペットボトル製造装置１の各構成要素を所定の動作タイミングで互いに同期させながら動かすための制御装置（図面では図示せず）が備わると共に、ペットボトル製造装置１の操作者が装置の操作を行ったり装置の作動状況を確認したりするための入力装置及び表示装置（図面では図示せず）が備わっている。 The base 11 is provided with a control device (not shown in the drawing) for moving the respective components of the plastic bottle manufacturing apparatus 1 according to the above-described embodiment at a predetermined operation timing while synchronizing with each other. An input device and a display device (not shown in the drawing) are provided for the operator of the device 1 to operate the device and check the operation status of the device.
　続いて、本実施形態に係るペットボトル製造装置１を用いたペットボトル３０の製造方法について説明する。最初にプリフォーム投入部３００においてプリフォーム２０が各マンドル１００の口部装着部１２０に順次１本ずつ差し込まれる。そして、プリフォーム搬送ライン区間に沿って加熱・風当てステーションに向けて搬送される。加熱・風当てステーションに近づいた段階で各マンドル１００は回転装置２５０によって回転する。これに伴い、各口部装着部１２０に嵌まり込んだプリフォーム２０も各口部装着部１２０と共にその軸芯周りに回転する。 Next, a method of manufacturing the plastic bottle 30 using the plastic bottle manufacturing apparatus 1 according to the embodiment will be described. First, the preform 20 is inserted one by one into the mouth mounting part 120 of each mandrel 100 in the preform input part 300. And it is conveyed to the heating / winding station along the preform conveyance line section. Each mandrel 100 is rotated by the rotating device 250 when approaching the heating / winding station. Along with this, the preform 20 fitted in each mouth mounting part 120 also rotates around its axis with each mouth mounting part 120.
　そして、プリフォーム２０は回転しながら加熱・風当てステーションのプリフォーム加熱部４００とプリフォーム風当て部５００の間を通過していく。加熱・風当てステーション通過中は、プリフォーム風当て部からの局所的な風当てが無いとプリフォーム２０の少なくとも表面が白化してしまう（結晶化してしまう）程度の、通常より大きな加熱量が各ヒーター４１０によって加えられる。 Then, the preform 20 passes between the preform heating unit 400 and the preform wind application unit 500 of the heating / air application station while rotating. During passage through the heating / winding station, a larger heating amount than usual, such that at least the surface of the preform 20 is whitened (crystallized) without local blowing from the preform blowing section, is used. Applied by each heater 410.
　即ち、このような加熱量がプリフォーム加熱部４００から加えられる一方、プリフォーム風当て部５００からの局所的な風当てによってプリフォーム２０の白化現象（結晶化現象）が阻止されながら加熱・風当てステーションをプリフォーム２０が順々に通過していく。 That is, while the heating amount is applied from the preform heating unit 400, the heating / winding is performed while the whitening phenomenon (crystallization phenomenon) of the preform 20 is prevented by the local blowing from the preform blowing unit 500. The preforms 20 pass through the contact station in sequence.
　このように、加熱・風当てステーション内におけるプリフォーム２０を加熱した後の空気は加熱空気排気部８００を介して常に排出され、加熱・風当てステーションを通過するプリフォーム２０に上述したプリフォーム２０の白化現象（結晶化現象）の発生をギリギリに抑えるプリフォーム加熱部４００の加熱量及び風当て量がプリフォーム２０に常にバランス良く供給される。なお、加熱後の空気はプリフォーム２０の口部２１と反対側に排出されるので、プリフォーム２０の加熱すべき部分だけ加熱することができる。 As described above, the air after heating the preform 20 in the heating / winding station is constantly discharged through the heated air exhaust unit 800, and the preform 20 passes through the heating / winding station. The amount of heating and the amount of air applied by the preform heating unit 400 for suppressing the occurrence of the whitening phenomenon (crystallization phenomenon) of the preform 20 are always supplied to the preform 20 in a well-balanced manner. Since the heated air is discharged to the opposite side of the mouth 21 of the preform 20, only the portion of the preform 20 to be heated can be heated.
　本発明の特徴的部分である加熱・風当てステーションを構成するプリフォーム加熱部４００の長さは、従来のペットボトル製造装置よりも短くなっているので、これを通過するプリフォーム２０は短時間で白化現象（結晶化現象）が生じることなくブロー成形可能な程度まで効率良く加熱される。 Since the length of the preform heating section 400 constituting the heating / blowing station, which is a characteristic part of the present invention, is shorter than that of the conventional PET bottle manufacturing apparatus, the preform 20 passing therethrough is short-lived. Thus, heating is efficiently performed to the extent that blow molding can be performed without causing a whitening phenomenon (crystallization phenomenon).
　加熱・風当てステーションで加熱されたプリフォーム２０はトランジットステーションでその前に搬送されるプリフォーム２０がブロー成形ステーションでブロー成形されるまでマンドル１００の口部装着部１２０に取り付けられたまま待機する。この際においても、回転装置２５０によってマンドル１００が回転することでプリフォーム２０も口部装着部１２０と共に回転し続ける。そして、トランジットステーションに設けられたトランジット風当て部９００によってプリフォーム２０の軸芯周りに全周に亘って風が吹き付けられ白化現象（結晶化現象）がトランジットステーションで生じるのを防止する。 The preform 20 heated in the heating / winding station waits while being attached to the mouth mounting portion 120 of the mandrel 100 until the preform 20 conveyed before in the transit station is blow-molded in the blow molding station. . Also at this time, the preform 20 continues to rotate together with the mouth mounting part 120 by rotating the mandrel 100 by the rotating device 250. Then, the wind is blown all around the axis of the preform 20 by the transit wind contact portion 900 provided in the transit station, thereby preventing the whitening phenomenon (crystallization phenomenon) from occurring in the transit station.
　先行するプリフォーム２０のブロー成形が終わった後、ブロー成形ステーションのブロー成形用金型６１０が開放され、続く加熱されたプリフォーム２０が口部装着部１２０に取り付けられたままマンドル１００ごとブロー成形ステーションまで移動して停止する。そして、ブロー成形用金型６１０が閉塞し、プリフォーム２０がペットボトル３０の大きさまでブロー成形される。 After the blow molding of the preceding preform 20 is completed, the blow molding die 610 of the blow molding station is opened, and the subsequent heated preform 20 is blow molded together with the mandrel 100 while being attached to the mouth mounting portion 120. Move to the station and stop. Then, the blow molding die 610 is closed, and the preform 20 is blow molded to the size of the PET bottle 30.
　ブロー成形されたペットボトル３０は、その飲み口部が口部装着部１２０に嵌まったままマンドル１００ごと搬送ライン２００のペットボトル搬送ライン区間をペットボトル取り出しステーションまで移動する。そして、ペットボトル取り出しステーションでマンドル１００が停止した状態でペットボトル取り出し部７００によりマンドル１００の口部装着部１２０からペットボトル３０が製品として順次取り出されていく。 The blow-molded PET bottle 30 moves the PET bottle transport line section of the transport line 200 together with the mandrel 100 to the PET bottle removal station with the spout fitted in the mouth mount 120. Then, with the mandrel 100 stopped at the PET bottle removal station, the PET bottle 30 is sequentially removed as a product from the mouth mounting portion 120 of the mandrel 100 by the PET bottle removal unit 700.
　口部装着部１２０からペットボトル３０が取り出された空マンドル１００は、搬送ライン２００の空マンドル搬送ライン区間を通って再びプリフォーム投入ステーションまで移動し、上述した一連の工程を再び繰り返す。 The empty mandrel 100 from which the PET bottle 30 has been taken out of the mouth mounting portion 120 moves again to the preform loading station through the empty mandrel transfer line section of the transfer line 200, and repeats the above-described series of steps again.
　このようにして、ペットボトル製造装置の生産効率及び小型化のネックとなっていた加熱ステーションを本発明においては従来とは異なる加熱・風当てステーションに変えることで、その生産効率をかなり高めると共にペットボトル製造装置自体の小型化を達成する。 In this way, by changing the heating station, which has been a bottleneck for the production efficiency and miniaturization of the PET bottle manufacturing apparatus, to a heating / winding station different from the conventional one in the present invention, the production efficiency can be considerably increased and the PET can be increased. To achieve miniaturization of the bottle manufacturing device itself.
　続いて、上述した実施形態を一例とする本発明に係るペットボトル製造装置において、従来とは異なり特別にプリフォーム風当て部やトランジット風当て部を設けてプリフォームに積極的に風を当てる理由についてより詳しく説明する。 Subsequently, in the PET bottle manufacturing apparatus according to the present invention, taking the above-described embodiment as an example, the reason why a preform wind contact portion or a transit wind contact portion is specially provided and a wind is positively applied to the preform unlike the related art. Will be described in more detail.
　ポリエチレンテレフタレート（ＰＥＴ）でできたプリフォームに熱をかけることの問題点として、加熱工程において一定の温度を超えた温度で急速に加熱するとその表面が結晶化（白化）してしまい、その後のブロー成形工程でそれ以上伸びなくなってしまう。即ち、ブロー成形工程でその結晶化した部分が伸びなくなったプリフォームは、規定の形状を有さない不良品のペットボトルとしてブロー成形されてしまう。そのため、加熱工程におけるヒーターの温度の上げ方にも限界が生じ、搬送ラインに沿ってある程度長い加熱ステーションを設ける必要がある。 One of the problems with applying heat to a preform made of polyethylene terephthalate (PET) is that if the preform is rapidly heated at a temperature exceeding a certain temperature in the heating process, the surface is crystallized (whitened), and the subsequent blowing is performed. No longer elongate in the molding process. That is, the preform whose crystallized portion has not been stretched in the blow molding step is blow molded as a defective PET bottle having no specified shape. Therefore, there is a limit in how to raise the temperature of the heater in the heating step, and it is necessary to provide a heating station that is relatively long along the transport line.
　特に、肉厚の厚いプリフォームの場合、マンドルを回転させてプリフォーム自体の厚み方向の表面から内側面までのかなりの厚みの部分をヒーターで充分加熱する必要がある。そのため、内側面まで充分加熱するようにプリフォームの表面部分からヒーターにより高温で加熱すると、プリフォームの表面と内側面で温度差が出ることになる。つまり、表面から内側までの温度変化の勾配が大きくなる。 Especially, in the case of a thick preform, it is necessary to rotate the mandrel to sufficiently heat a considerable thickness portion from the surface in the thickness direction of the preform itself to the inner surface with a heater. Therefore, when the preform is heated at a high temperature from the surface portion of the preform so that the inner surface is sufficiently heated, a temperature difference occurs between the preform surface and the inner surface. That is, the gradient of the temperature change from the surface to the inside increases.
　プリフォームの内側面を所定の温度に達するまで加熱した状態においては、プリフォームの表面からのみ加熱している関係上、厚み方向の温度勾配がどうしても生じてプリフォームの表面の温度が高温となり、表面だけ白化（結晶化）してしまう場合がある。 In the state where the inner side surface of the preform is heated until reaching the predetermined temperature, the temperature of the surface of the preform becomes high due to the temperature gradient in the thickness direction inevitably caused by heating only from the surface of the preform, In some cases, only the surface is whitened (crystallized).
　プリフォームの一部でも白化（結晶化）して規定通り膨張しないと、所望のペットボトルの形状とならず不良品となってそのまま廃棄するか再度フレークに裁断してリサイクルせざるを得ないため、製品の歩留まりが低下してしまう。 If a part of the preform does not whiten (crystallize) and expand as specified, it will not be the desired shape of the PET bottle and will be defective and must be discarded as it is or cut again into flakes and recycled. As a result, the product yield is reduced.
　そのため従来は、肉厚の厚いプリフォームを加熱する場合や、生産速度を上げる場合、加熱ステーションの長さを搬送ラインに沿ってかなり長くする必要がある。その結果、ペットボトル製造装置自体の大型化を招き、また生産速度を上げるために加熱ステーションの長さを長くするにも限りがあるためペットボトルの生産効率が制限されてしまう。 Therefore, conventionally, when heating a thick preform or increasing the production speed, it is necessary to considerably lengthen the heating station along the transfer line. As a result, the size of the PET bottle manufacturing apparatus itself is increased, and the length of the heating station is increased to increase the production speed, so that the production efficiency of the PET bottle is limited.
　しかしながら、本発明によると、加熱・風当てステーションにおいてヒーターによってプリフォームが加熱されると同時にそのプリフォームにプリフォーム風当て部の風当てスリットガイドから局所的に風を当てることによって、たとえ肉厚の厚いプリフォームであっても内外面の温度差を縮め、内側面の所定温度に、白化（結晶化）することなく到達する状態を、余分な時間をかけず、つくり出すことができる。 However, according to the present invention, the preform is heated by the heater at the heating / blowing station, and at the same time, the preform is locally blown from the breeze slit guide of the preform breeze section, thereby increasing the thickness. Even if the preform has a large thickness, the temperature difference between the inner and outer surfaces can be reduced, and a state in which the inner surface reaches a predetermined temperature without whitening (crystallization) can be created without extra time.
　更には、加熱・風当てステーションを出たプリフォームがブロー成形用の金型に入るまでの間で規定されるトランジット（待機）区間においても風を当てるようになっているので、その効果を高めることができる。 Further, the air is applied in a transit (standby) section defined before the preform that has exited the heating / air application station enters the mold for blow molding. be able to.
　即ち、本発明においては、上述したようなプリフォーム風当て部によって、加熱・風当てステーション及びトランジットステーションにおいて風当て部分をつくり、プリフォームの表面を強制的に冷やすことで、加熱装置のヒーター温度を高めてもプリフォームの表面に白化現象（結晶化現象）が生じるのを防止することができることを発明者が着目した事に技術的に大きな意義がある。 That is, in the present invention, the preform blasting section as described above forms a blasting section at the heating / blowing station and the transit station, and forcibly cools the surface of the preform, thereby reducing the heater temperature of the heating device. It is technically significant that the inventors have noticed that the whitening phenomenon (crystallization phenomenon) can be prevented from occurring on the surface of the preform even if the height is increased.
　また、この風当て中、プリフォームは回転装置で常に回転しているので、プリフォームの外周面にヒーターの熱が均一に加わると共に、風当て部のガイドスリットから吹き出した風が均一に当たる。 In addition, since the preform is constantly rotating by the rotating device during the wind application, the heat of the heater is uniformly applied to the outer peripheral surface of the preform, and the air blown out from the guide slit of the air application portion is uniformly applied.
　その結果、ヒーターの熱を、表面からプリフォームに当て、プリフォームの内側に浸透していく過程において従来のようにプリフォームの表面が高温になり白化（結晶化）が生じてしまうのを防ぐことができる。 As a result, in the process of applying the heat of the heater to the preform from the surface and permeating the inside of the preform, the surface of the preform is prevented from becoming hot and causing whitening (crystallization) as in the conventional case. be able to.
　また、プリフォームの表面に風を当てることにより、プリフォームを従来よりも高温で加熱しても表面の白化（結晶化）を抑えながら従来に比べてプリフォームの内側にすばやく熱を伝えることができるので、表面と内面の温度差が小さくなる。その結果、プリフォームの表面に白化（結晶化）を生じさせることなく表面から内側面に至るまで全体的に温度変化の勾配の緩い高温の加熱状態とすることができる。 In addition, by blowing air to the surface of the preform, even if the preform is heated at a higher temperature than before, heat can be transferred to the inside of the preform more quickly than before, while suppressing whitening (crystallization) of the surface. As a result, the temperature difference between the surface and the inner surface is reduced. As a result, a high-temperature heating state having a gentle gradient of temperature change from the surface to the inner surface can be obtained without causing whitening (crystallization) on the surface of the preform.
　そのため、このようにたとえ肉厚の厚いプリフォームであっても全体的に高温で安定したプリフォームに加熱することができその後ブロー成形も容易になる。 Therefore, even if the preform has a large thickness, the preform can be heated to a stable preform at a high temperature as a whole, and the blow molding becomes easy thereafter.
　また、本発明特有の風当て技術により、従来技術のようにプリフォームの表面が高温になり白化（結晶化）が生じてしまうのを防ぐため、ゆっくり白化しない程度の温度でプリフォームを加熱し、熱を浸透させるという対策を取る必要がないので、ヒーターを高温にでき、加熱時間を短縮することが可能となる。その結果ヒーターゾーンを短くできるので加熱装置の消費電力を低減させることができる。 In addition, the preform is heated at a temperature at which the preform surface is not slowly whitened in order to prevent the surface of the preform from becoming high temperature and causing whitening (crystallization) as in the prior art by the wind application technique unique to the present invention. Since it is not necessary to take measures to infiltrate heat, the temperature of the heater can be increased and the heating time can be shortened. As a result, the heater zone can be shortened, so that the power consumption of the heating device can be reduced.
　そして、本発明によるとペットボトル製造装置の省スペース化を図ることで大きなメリットが生じる。つまり、従来のペットボトル製造装置によると、特に肉厚の厚いプリフォーム等をペットボトルにする場合、ヒーター時間が長くなければならないので、これに伴い長い加熱ステーションが必要となっていたが、本発明の場合、プリフォームの加熱過程において加熱時間を短縮できるので、加熱・風当てステーションを短くできる。 According to the present invention, there is a great merit in saving space in the PET bottle manufacturing apparatus. In other words, according to the conventional PET bottle manufacturing equipment, especially when a thick preform is made into a PET bottle, the heating time must be long, and thus a long heating station is required. In the case of the present invention, the heating time can be shortened in the heating process of the preform.
　また、本発明に係るペットボトル製造装置によると、プリフォームの肉厚が厚くても安定したブロー成形を行い、歩留まりの良好なペットボトルの製造が可能となる。その結果、様々なタイプのペットボトルを製造するためのプリフォームをこのペットボトル製造装置に投入することができるようになる。具体的には、ウォーターサーバー用ペットガロンボトルにブロー成形可能な肉厚の厚いプリフォームが一例として挙げられる。また、略一定の直径を有する一般的なペットボトルとは異なる異形形状のペットボトル、即ち例えば人気のあるアニメのキャラクターや観光名所としての有名な建造物を三次元的に模したような異形形状のペットボトルにブロー成形可能な肉厚の厚いプリフォームに対してもこのペットボトル製造装置を利用可能である。 According to the PET bottle manufacturing apparatus of the present invention, stable blow molding can be performed even if the thickness of the preform is large, and a PET bottle with a good yield can be manufactured. As a result, preforms for producing various types of PET bottles can be put into this PET bottle production apparatus. Specifically, a thick preform that can be blow-molded into a PET gallon bottle for a water server is given as an example. In addition, a plastic bottle having a different shape from a general plastic bottle having a substantially constant diameter, that is, a deformed shape that three-dimensionally imitates a famous building as a popular anime character or a tourist attraction, for example. This PET bottle manufacturing apparatus can also be used for thick preforms that can be blow molded into PET bottles.
　これに加えて、本発明に係るペットボトル製造装置の場合、限られたスペースにペットボトル製造装置を設置する要望がある場合、大型機よりも省スペース設計の装置とすることができる。 In addition, in the case of the PET bottle manufacturing apparatus according to the present invention, if there is a demand to install the PET bottle manufacturing apparatus in a limited space, the apparatus can be designed to be more space-saving than a large machine.
　即ち、一般的な量産機の場合のように生産スピードを上げる為に加熱部の全長を必要以上に長くする必要がなく、その結果、機械が大型化することがない。具体的には、従来の一般的な製造装置の場合、生産スピードを上げるために加熱温度を通常より上げる方法ではプリフォームが白化（結晶化）してしまい、ブローしてペットボトル形状まで膨らますことが難しかった。これを防止すべく加熱温度は通常と大幅な変化は持たせず、プリフォームの加熱部通過速度を上げ、かつ外側から内側への熱の浸透を得るために加熱部の全長を長く伸ばした装置とならざるを得ず、機械の大型化につながっていた。しかし、本発明の場合、風当て装置により高温でのプリフォーム加熱が可能となり、ヒーターゾーンが短縮されたことにより省スペース設計に対応した特性を生かしつつ、つまりは大量のプリフォームを従来よりも短時間で加熱し、大量生産用の型数の多い金型に入れ、ブロー成形することができるので、従来より短時間で大量のペットボトルを製造することができる。 That is, it is not necessary to lengthen the entire length of the heating section more than necessary in order to increase the production speed as in the case of a general mass production machine, and as a result, the machine is not increased in size. Specifically, in the case of conventional general manufacturing equipment, if the heating temperature is raised above normal to increase the production speed, the preform will whiten (crystallize), blow and expand to the shape of a PET bottle. Was difficult. In order to prevent this, the heating temperature does not have a significant change from the normal, the speed of passing the preform through the heating part is increased, and the entire length of the heating part is elongated to obtain heat penetration from the outside to the inside. This had to be the case, leading to larger machines. However, in the case of the present invention, the preform can be heated at a high temperature by the air blowing device, and the characteristics corresponding to the space-saving design can be utilized by shortening the heater zone. Since heating can be performed in a short period of time, the mold can be put into a large number of molds for mass production and blow-molded, a large number of PET bottles can be manufactured in a shorter time than before.
　更には、本発明に係るペットボトル製造装置によると、耐熱性ペットボトルを製造するのにも適している。具体的には、解決すべき課題で詳細に説明したペットボトルの一形態である耐熱ペットボトルに関する問題も解決することができる。即ち、本発明によると従来とは異なり、プリフォームの外側から内側まで高温の熱を浸透させることができるので、従来のように外側の熱が内側に伝わる前に外側の白化が進みブロー成形でペットボトル形状まで膨らますことができなかったり、プリフォーム外側の白化を避けるために白化寸前までプリフォームを加熱できないという理由で、耐熱温度が低いボトルしか成形できなかったりという問題を解決することができる。その結果、本発明の場合、耐熱ボトル製造の際に従来問題となっていた常温ボトル製造とは異なる工程を踏むような複雑な製造工程を踏まなくてすみ、この工程を簡略化させることができる。 Further, the PET bottle manufacturing apparatus according to the present invention is suitable for manufacturing a heat-resistant PET bottle. Specifically, the problem relating to a heat-resistant plastic bottle which is one mode of the plastic bottle described in detail in the problem to be solved can be solved. That is, according to the present invention, unlike the conventional case, the high-temperature heat can penetrate from the outside to the inside of the preform. It is possible to solve the problem that only a bottle with a low heat-resistant temperature can be molded because the preform cannot be expanded to the shape of a PET bottle, or the preform cannot be heated to just before whitening to avoid whitening on the outside of the preform. . As a result, in the case of the present invention, there is no need to perform a complicated manufacturing process such as performing a process different from a normal temperature bottle manufacturing which has conventionally been a problem in manufacturing a heat-resistant bottle, and this process can be simplified. .
　続いて、上述した本発明に係るペットボトル製造装置の適用対象の広さについて補足説明する。まず、ウォーターサーバー等大容量ボトルにも応用が利く点について説明する。ウォーターサーバー（３ガロン・５ガロン等）ボトルは、プリフォームをかなり引き伸ばして製造する。 Next, a supplementary description will be given of the scope of application of the above-described PET bottle manufacturing apparatus according to the present invention. First, the point that the present invention is applicable to a large capacity bottle such as a water server will be described. Water server (3 gallon, 5 gallon, etc.) bottles are made by stretching the preform considerably.
　ガロンボトルのように大容量ボトルを膨らます場合、コーナー部分をつくるには、プリフォームを高温で熱して成形するため、コーナー部分のひけ（くしゃくしゃになる現象）若しくは、白化（結晶化）することが多く、従来では理想的な成形条件を出すのは極めて難しかったが、本発明に係る風当て技術を使えば、そのような問題を一気に解消することができる。 When inflating a large-capacity bottle such as a gallon bottle, the preform is heated at a high temperature to form the corners, so the corners may be shrunk (crumpled) or whitened (crystallized). In many cases, it has been extremely difficult to obtain ideal molding conditions in the past, but such a problem can be solved at a stretch by using the blowing technique according to the present invention.
　また、延伸倍率が高いペットボトル（プリフォームを多く伸ばす必要のあるペットボトル）にも応用が利く。複雑な形状ボトルを製造する時に使う肉厚プリフォームは、内部まで熱が浸透するのに時間がかかるため、風当て技術を使いプリフォーム内部までの浸透時間を短縮し、表面と内面の温度が一定の高温プリフォームにすることによって安定した品質のペットボトル成形が可能となる。 It is also applicable to PET bottles with high draw ratios (PET bottles that need to stretch a lot of preforms). Thick preforms used when manufacturing bottles with complex shapes take time for heat to penetrate into the interior, so use the air blowing technology to reduce the penetration time to the inside of the preform and reduce the temperature of the surface and inner surface. By using a constant high-temperature preform, PET bottles of stable quality can be formed.
　なお、本発明の範囲は上述した実施形態に限るものではない。即ち、上述した実施形態におけるプリフォームの材質に限定されるものではなく、例えば、ポリエチレンテレフタレートでできたプリフォームに代えて、加熱過程において結晶化現象が生じる場合のある例えばポリプロピレン（ＰＰ）でできたプリフォームを本発明に係るペットボトル製造装置のプリフォーム投入部に投入することも可能である。 Note that the scope of the present invention is not limited to the above-described embodiment. That is, the present invention is not limited to the material of the preform in the above-described embodiment. For example, instead of the preform made of polyethylene terephthalate, the preform may be made of, for example, polypropylene (PP), which may cause a crystallization phenomenon in a heating process. It is also possible to put the preform into the preform feeding section of the PET bottle manufacturing apparatus according to the present invention.
　また、本発明の範囲は、上述した実施形態における各構成要素に関して挙げた形状や個数に限定されるものではない。例えば、搬送ライン全体がペットボトル製造装置の上側に設置され、プリフォームやペットボトルを取り付けるマンドルを搬送ラインに下向きに所定間隔で設けることで、プリフォームやペットボトルを吊り下げながら搬送ラインに沿ってこれらを移動させる形態のペットボトル製造装置についても適用可能である。なお、この場合は、加熱・風当てステーションの加熱空気排気部がプリフォームの口部と反対側に位置する構造となる場合もある。 範 囲 Also, the scope of the present invention is not limited to the shapes and numbers given for each component in the above-described embodiment. For example, the entire transport line is installed above the PET bottle manufacturing equipment, and a mandrel for attaching preforms and PET bottles is provided at predetermined intervals downward in the transport line, so that the preforms and PET bottles can be suspended along the transport line. The present invention is also applicable to a PET bottle manufacturing apparatus in which these are moved. In this case, the heated air exhaust unit of the heating / winding station may be configured to be located on the side opposite to the mouth of the preform.
　また、プリフォーム風当て部において必ずしも風当てガイドスリットを設ける必要はないが、風当てガイドスリットを設けることでプリフォームに向けて効率的に風を当てることができるので好ましい。 風 Also, it is not always necessary to provide a wind application guide slit in the preform air application section, but it is preferable to provide an air application guide slit since air can be efficiently applied to the preform.
　また、図１においては、プリフォーム風当て部５００は、マンドルの搬送方向に沿ってプリフォーム加熱部４００のヒーター４１０と同程度の長さで設けたが、必ずしもこれと同等にすることなくプリフォーム風当て部５００の長さはその作用が充分に発揮できれば多少短くする等適宜変更可能であることは言うまでもない。 Further, in FIG. 1, the preform air contact section 500 is provided in the same length as the heater 410 of the preform heating section 400 along the mandrel conveyance direction, but the preform is not necessarily equivalent thereto. It goes without saying that the length of the remodeling air contact portion 500 can be changed as appropriate, for example, if the action can be sufficiently exerted, such as by shortening the length a little.
　また、加熱・風当てステーションにおいてプリフォーム風当て部が設けられていれば、加熱・風当てステーションとブロー成形ステーションとの間にトランジット風当て部を必ずしも設ける必要は無い。しかしながら、これらの間の搬送ラインの近傍の一部又は全部にトランジット風当て部を設けることによって、本発明の上述した作用をより効果的に発揮することができる。 (4) If a preform wind application unit is provided at the heating / air application station, it is not always necessary to provide a transit air application unit between the heating / air application station and the blow molding station. However, by providing the transit wind application part in a part or the whole in the vicinity of the transport line between them, the above-described operation of the present invention can be more effectively exerted.
　また、本発明に係るペットボトル製造装置によってペットボトルの大量生産をより一層可能とするために、ブロー成形部が一度に複数本のペットボトルをブロー成形可能な構造となっていても良い。具体的には、例えばブロー成形部に複数の金型が直列に並んで設置され、それぞれの金型において同時にプリフォームをブロー成形してペットボトルとするような構造が考えられる。プリフォーム加熱部の部分が従来の大量生産機よりも短くなっているため、従来と比べ省スペース設計の製造装置においても大量生産に対応できる。 In addition, in order to further enable mass production of PET bottles with the PET bottle manufacturing apparatus according to the present invention, the blow molding section may have a structure capable of blow molding a plurality of PET bottles at a time. Specifically, for example, a structure is conceivable in which a plurality of dies are arranged in series in a blow molding unit, and a preform is blow-molded simultaneously in each of the dies to form a PET bottle. Since the preform heating section is shorter than that of a conventional mass production machine, mass production can be performed even in a manufacturing apparatus having a space-saving design compared to the conventional one.
　なお、本発明に係るペットボトル製造装置によると、上述したポリエチレンテレフタレートでできたプリフォームに代えて、加熱過程において結晶化現象が生じる場合のあるプリフォームをプリフォーム投入部に投入できる。具体的には、例えばポリプロピレン（ＰＰ）等の熱可塑性樹脂でできたプリフォームをプリフォーム投入部に投入することで、ポリプロピレンでできた飲料用容器や食品用容器として利用可能なペットボトルを小型のペットボトル製造装置によって大量生産することが可能となる。 According to the PET bottle manufacturing apparatus of the present invention, a preform in which a crystallization phenomenon may occur during the heating process can be charged into the preform charging section instead of the above-described preform made of polyethylene terephthalate. More specifically, for example, a preform made of a thermoplastic resin such as polypropylene (PP) is put into a preform feeding section to reduce the size of a PET bottle that can be used as a beverage container or a food container made of polypropylene. It is possible to mass-produce with the PET bottle manufacturing apparatus.
　最後に、本発明の作用を発揮することの出来る第２の実施形態について説明する。図５は、本発明の第２の実施形態に係るペットボトル製造装置の構成を概略的に示す平面図である。第２の実施形態に係るペットボトル製造装置は、基本的に第１の実施形態に係るペットボトル製造装置と等価的な構成を有しているため、両者の異なる構成である第２の実施形態の特徴的部分についてのみ説明し、その他の構成については図面に同等の符号を付して詳細な説明を省略する。 Finally, a second embodiment capable of exhibiting the function of the present invention will be described. FIG. 5 is a plan view schematically showing a configuration of a PET bottle manufacturing apparatus according to the second embodiment of the present invention. The plastic bottle manufacturing apparatus according to the second embodiment basically has a configuration equivalent to the plastic bottle manufacturing apparatus according to the first embodiment, and thus the second embodiment is different from the both. Only the characteristic portions of the present embodiment will be described, and the other components will be denoted by the same reference numerals in the drawings and detailed description thereof will be omitted.
　なお、図５において発明の理解の容易化と図示の簡略化のためにマンドル１００の数を少なめに描いたが、実際にはよりペットボトル製造装置２の大きさによって異なるが図示する数よりも多くの数のマンドル１００が互いに短い間隔で搬送ライン２００によって搬送されている。 In FIG. 5, the number of mandrels 100 is illustrated to be smaller for easier understanding of the invention and for simplification of the illustration, but actually differs depending on the size of the PET bottle manufacturing apparatus 2, but is smaller than the number illustrated. A large number of mandrels 100 are transported by the transport line 200 at short intervals from each other.
　第１の実施形態に係るペットボトル製造装置１においては、プリフォーム風当て部５００は、プリフォーム加熱部４００によってプリフォーム２０が加熱される過程においてプリフォーム２０に風を当てるように設けられていた。そして、トランジット風当て部９００がその補助的な風当て装置としてプリフォーム２０を加熱してからブロー成形部６００に入るまでの間のトランジットゾーンの所定位置に設けられていた。そして、このトランジット風当て部９００は、あくまで補助的な風当ての役目をするものであり、プリフォーム加熱部４００に対向する位置にメインのプリフォーム風当て部５００が設けられていれば、補助的なトランジット風当て部９００については必ずしも必要としない旨を説明した。 In the PET bottle manufacturing apparatus 1 according to the first embodiment, the preform blowing unit 500 is provided so as to blow the preform 20 in the process of heating the preform 20 by the preform heating unit 400. Was. Then, the transit air blowing unit 900 is provided as a supplemental air blowing device at a predetermined position in the transit zone from when the preform 20 is heated to when it enters the blow molding unit 600. The transit air contact section 900 serves only as an auxiliary air contact. If the main preform contact section 500 is provided at a position facing the preform heating section 400, the auxiliary air contact section 900 is provided. It has been described that the typical transit wind contact portion 900 is not necessarily required.
　一方、第２の実施形態に係るペットボトル製造装置２の場合、図５に示すように、プリフォーム加熱部４００には第１の実施形態のプリフォーム風当て部５００の代わりに加熱促進用反射板５５０が設けられ、第１の実施形態における補助的役目を果たしていたトランジット風当て部９００が設けられた位置には、トランジットゾーン風当て部９５０が本実施形態におけるメインの風当て部として設けられている。 On the other hand, in the case of the PET bottle manufacturing apparatus 2 according to the second embodiment, as shown in FIG. 5, the preform heating unit 400 includes a heating-promoting reflection instead of the preform air contacting unit 500 of the first embodiment. At the position where the plate 550 is provided and the transit air contact portion 900 that has served the auxiliary role in the first embodiment is provided, the transit zone air contact portion 950 is provided as a main air contact portion in the present embodiment. ing.
　加熱促進用反射板５５０は、加熱用のヒーター４１０と搬送ライン２００を介して反対側に設けられ、ヒーター４１０の熱を反射することでプリフォーム２０に効率良く熱を加えるための役目を果たしている。なお、プリフォーム加熱部４００の加熱促進用反射板５５０については第２の実施形態においてとりあえず設けたものであり、本発明を実施する上ではプリフォーム２０の加熱状況に応じて必ずしも必要としない。 The heating-promoting reflector 550 is provided on the opposite side of the heating heater 410 via the transport line 200, and serves to efficiently apply heat to the preform 20 by reflecting the heat of the heater 410. . Note that the heating-promoting reflector 550 of the preform heating unit 400 is provided for the time being in the second embodiment, and is not necessarily required for implementing the present invention according to the heating condition of the preform 20.
　第２の実施形態におけるプリフォーム加熱部４００の構造については、プリフォーム風当て部５００の代わりに加熱促進用反射板５５０が設けられた以外、第１の実施形態と同様であるので、共通する各構成要素の説明を省略する。 The structure of the preform heating unit 400 according to the second embodiment is the same as that of the first embodiment except that a heating-promoting reflector 550 is provided instead of the preform air contacting unit 500, and is therefore common. Description of each component is omitted.
　トランジットゾーン風当て部９５０は、第１の実施形態のトランジット風当て部９００と基本的構成を共通とするが、プリフォーム加熱部４００を通り過ぎる間は白化（結晶化）現象が生じずこのトランジットゾーンにおいて急に白化（結晶化）現象が生じる場合の対策を低コストで確実にとることができる。なお、図５においては、説明の都合上及び発明の理解の容易化のためにトランジットゾーン風当て部９５０を１つだけ描いているが、機種によっては数個のプリフォーム２０に風が当たる構造となる場合があるので、実際には図５のようなマンドル１００の配置形態に限定されるものではない。 The transit zone blasting section 950 has the same basic configuration as the transit blasting section 900 of the first embodiment, but does not cause a whitening (crystallization) phenomenon while passing through the preform heating section 400. In this case, measures for sudden whitening (crystallization) can be taken at low cost. In FIG. 5, only one transit zone air contact portion 950 is illustrated for convenience of explanation and to facilitate understanding of the invention. However, depending on the model, a structure in which the wind hits several preforms 20 may be used. In fact, the arrangement is not limited to the configuration of the mandrel 100 as shown in FIG.
　このようにプリフォーム加熱部４００にプリフォーム風当て部５００を設けることなく、プリフォーム加熱部４００でプリフォーム２０を加熱してからブロー成形部６００に入るまでの間の所定位置にトランジットゾーン風当て部９５０が設けられていても本発明特有の作用効果を十分に発揮し得る。この点について以下に説明する。 As described above, without providing the preform wind application section 500 in the preform heating section 400, the transit zone wind is located at a predetermined position between the time when the preform 20 is heated by the preform heating section 400 and the time when the preform 20 enters the blow molding section 600. Even if the contact portion 950 is provided, the function and effect unique to the present invention can be sufficiently exhibited. This will be described below.
　第２の実施形態特有の構成であるトランジットゾーンだけの風当て部がなぜ有効なのかに付いての所見は以下の通りである。
（１）プリフォームの加熱ゾーンの加熱中においては白化（結晶化）が生じないがトランジットゾーンで白化（結晶化）してしまう場合があるためである。具体的には、プリフォーム加熱部を出てすぐに白化（結晶化）してしまうことがよくあるためである。
（２）プリフォーム加熱部でプリフォームが熱せられ、加熱部後半になればなるほど熱がプリフォームにこもるため、加熱部後半及び加熱部を出てすぐの場所で高温になり、白化（結晶化）してしまう現象が発明者によって確認されている。そのため、そのような現象を防ぐためにトランジットゾーンのみで風を当てることによる白化（結晶化）を防止することが現状において非常に有効な手段として考えられるからである。
（３）プリフォームをペットボトルに成形する際に設計通りの理想的な成形を行うためには、プリフォームの内外面の温度には差がない（一定である）ことが望ましい。即ちプリフォームの外周面から内周面に達するまでの温度勾配（温度の下がり方の傾き）が全くないか実際にこれに影響を与える諸要因を勘案したとしても小さければ小さいほど好ましい。 The findings regarding why the air contact portion of only the transit zone, which is a configuration unique to the second embodiment, is effective are as follows.
(1) Whitening (crystallization) does not occur during heating of the preform heating zone, but whitening (crystallization) may occur in the transit zone. Specifically, this is because whitening (crystallization) often occurs immediately after leaving the preform heating section.
(2) The preform is heated in the preform heating section, and the heat is stored in the preform in the latter half of the heating section. ) Has been confirmed by the inventor. Therefore, in order to prevent such a phenomenon, prevention of whitening (crystallization) caused by blowing air only in the transit zone is considered as a very effective means at present.
(3) In order to perform an ideal molding as designed when molding the preform into a PET bottle, it is desirable that the temperature of the inner and outer surfaces of the preform has no difference (is constant). That is, it is preferable that there is no temperature gradient from the outer peripheral surface to the inner peripheral surface of the preform (the gradient of the temperature decrease) or that it is as small as possible even if various factors affecting the temperature are considered.
　そのため、プリフォーム加熱部にプリフォーム風当て部を設けない場合、プリフォーム加熱部でプリフォームを熱するとプリフォームの外側から内側に向かって熱が一方向に伝わることに起因して、プリフォーム加熱部を出た時点では外側と内側の温度が一定でなくなる場合がある。これは、プリフォームの肉厚が厚ければ厚いほど顕著になる傾向にある。 Therefore, if the preform heating section is not provided with a preform wind application section, when the preform is heated by the preform heating section, the heat is transmitted in one direction from the outside to the inside of the preform. At the time of exiting the heating section, the outside and inside temperatures may not be constant. This tends to be more pronounced as the thickness of the preform increases.
　そのため、このようにプリフォーム外側の温度が内側の温度よりも高くなっている状態を、プリフォームがプリフォーム加熱部を出た加熱過程の直後におけるトランジットゾーンにおいて外側から風をあてて内外面の温度を近づけることで、第１の実施形態においてプリフォーム加熱部でプリフォーム風当て部によりプリフォームに風を当てた場合と同等の理由で、本発明の作用を十分に発揮することができる。即ち、プリフォーム加熱部やその後のトランジットゾーンにおいて風当て部を有さない従来のペットボトル製造装置のように白化（結晶化）が生じたり、内外面の温度差が一定でないためにボトル成形不良が生じてしまったりするのを防止することができる。 Therefore, the state in which the temperature of the outside of the preform is higher than the temperature of the inside in the transit zone immediately after the heating process in which the preform has left the preform heating unit is exposed to wind from the outside, and the inside and outside surfaces are exposed. By bringing the temperature closer, the effect of the present invention can be sufficiently exerted for the same reason as in the first embodiment in which the preform heating unit applies air to the preform by the preform air application unit. That is, whitening (crystallization) occurs as in the conventional PET bottle manufacturing apparatus having no air blowing section in the preform heating section and the subsequent transit zone, and bottle molding failure due to an uneven temperature difference between the inner and outer surfaces. Can be prevented from occurring.
　以上のような理由により、第１の実施形態のようにプリフォーム加熱部４００にプリフォーム風当て部５００を設けず、その代わりにトランジットゾーンにトランジットゾーン風当て部９５０を設けても本発明の効果を発揮することが十分に可能となる。 For the reasons described above, even if the preform heating unit 400 is not provided with the preform blowing unit 500 as in the first embodiment, and instead the transit zone blowing unit 950 is provided in the transit zone, the present invention can be applied. The effect can be fully exhibited.
　トランジットゾーン風当て部の具体的構成としては、図５に代表的に示したトランジットゾーン風当て部９５０の設置位置であっても良く、その設置位置の開始場所を実際にはプリフォーム加熱部４００の出口側に設け、この開始場所から搬送ライン２００に沿ってブロー成形部６００に向けて上述したプリフォームの白化（結晶化）を防ぐのに十分な長さのトランジットゾーン風当て部９５０を設ける形態にしても良い。この場合の長さは、トランジットゾーン風当て部９５０によって当てる風の量や風速などを勘案してシミュレーションや実地検証などを経て決定するのが良い。 As a specific configuration of the transit zone wind application section, the installation position of the transit zone air application section 950 typically shown in FIG. 5 may be used. And a transit zone air blowing section 950 having a length sufficient to prevent the above-described whitening (crystallization) of the preform from the start position toward the blow molding section 600 along the transport line 200. It may be in a form. In this case, the length is preferably determined through simulation, on-site verification, or the like in consideration of the amount of wind blown by the transit zone wind blowing unit 950, the wind speed, and the like.
　本発明にかかる第２の実施形態に係るペットボトル製造装置によると、既存のペットボトル製造装置、即ちプリフォーム加熱装置にプリフォーム風当て部が設けられていない製造装置にトランジットゾーン風当て部を後付けすることが可能となる。これによって、従来型のプリフォーム加熱装置のヒーターの温度を高めると共に、マンドルの加熱装置内における搬送ライン状の移動速度を上げることで、全てのプリフォームが従来よりも短時間に加熱工程を通過させることができるようになる。 According to the PET bottle manufacturing apparatus according to the second embodiment of the present invention, the existing PET bottle manufacturing apparatus, that is, the manufacturing apparatus in which the preform heating section is not provided with the preform blowing section is provided with the transit zone blowing section. It can be retrofitted. This raises the temperature of the heater of the conventional preform heating device and raises the moving speed of the transfer line in the heating device of the mandrel, so that all the preforms pass through the heating process in a shorter time than before. Will be able to do that.
　即ち、このような状態においては従来ではプリフォーム加熱装置を出た直後にプリフォームの白化（結晶化）現象が生じてしまう恐れがあったりプリフォームの外側と内側との熱分布の温度勾配が好ましくない程度まで生じたりしてその後のブロー成形部におけるブロー成形に悪影響を与えていたが、既存のペットボトル製造装置に本発明に係る第２の実施形態のようにトランジットゾーン風当て部を後付けすることで、プリフォームがプリフォーム加熱装置を出た後のトランジットゾーンにおいてトランジットゾーン風当て部によってプリフォームに風を当てることができるようになり、従来のような白化（結晶化）に基づく深刻な問題の発生を回避することができる。 That is, in such a state, the whitening (crystallization) phenomenon of the preform may occur immediately after leaving the preform heating apparatus, or the temperature gradient of the heat distribution between the outside and the inside of the preform may be reduced. Although it occurred to an undesired degree and had an adverse effect on the subsequent blow molding in the blow molding section, a transit zone air contact section was retrofitted to the existing PET bottle manufacturing apparatus as in the second embodiment according to the present invention. By doing so, in the transit zone after the preform has exited the preform heating device, the preform can be blown by the transit zone breeze part, and the seriousness based on the conventional whitening (crystallization) can be caused. Problems can be avoided.
　このように、本発明の第２の実施形態によると、既存のペットボトル製造装置にプリフォーム風当て部を後付けすることで、さらなる効果として、その製造装置のプリフォーム加熱装置における加熱過程の時間を短縮化することができる。これによって、決まった時間内により多くのペットボトルを効率よく製造することができるようになるという特別なメリットを共有することができる。 As described above, according to the second embodiment of the present invention, as a further effect, by adding the preform airing unit to the existing PET bottle manufacturing apparatus, the time of the heating process in the preform heating apparatus of the manufacturing apparatus is further improved. Can be shortened. This can share the special advantage that more PET bottles can be manufactured more efficiently in a fixed time.
　１，２　　ペットボトル製造装置
　１１　　基台
　２０　　プリフォーム
　２１　　口部
　３０　　ペットボトル
　１００　　マンドル
　１１０　　ハウジング
　１２０　　口部装着部
　１３０　　回転連結部
　２００　　搬送ライン
　２１０　　プリフォーム搬送ライン区間
　２２０　　ペットボトル搬送ライン区間
　２３０　　空マンドル搬送ライン区間
　２５０　　回転装置
　３００　　プリフォーム投入部
　４００　　プリフォーム加熱部
　４１１，４１２，４１３，４１４，４１５，４１６（４１０）　　ヒーター
　４２０　　加熱部内風当て部
　５００　　プリフォーム風当て部
　５１０　　送風機
　５２０　　風当てスリットガイド
　５２１～５２７　　仕切り板
　５５０　　加熱促進用反射板
　６００　　ブロー成形部
　６１０　　（ブロー成形用）金型
　６１１，６１２　　半部（金型）
　７００　　ペットボトル取り出し部
　８００　　加熱空気排気部
　９００　　トランジット風当て部
　９５０　　トランジットゾーン風当て部
  1 and 2 PET bottle manufacturing apparatus 11 Base 20 Preform 21 Mouth 30 PET bottle 100 Mandrel 110 Housing 120 Mouth mounting section 130 Rotating connection section 200 Transport line 210 Preform transport line section 220 PET bottle transport line section 230 Empty mandrel Conveying line section 250 Rotating device 300 Preform input section 400 Preform heating section 411, 412, 413, 414, 415, 416 (410) Heater 420 Heating section internal air application section 500 Preform air application section 510 Blower 520 Air application slit guide 521 to 527 Partition plate 550 Reflection plate for heating promotion 600 Blow molding part 610 (for blow molding) Mold 611,612 Half (mold)
700 PET bottle take-out section 800 Heated air exhaust section 900 Transit air application section 950 Transit zone air application section

Claims (9)

  1. 　ブロー成形によりペットボトルを製造するペットボトル製造装置において、
    　前記ペットボトル製造装置は、
    　ペットボトルとしてブロー成形されるプリフォームを所定の間隔で順々に搬送する搬送ラインと、
    　前記搬送ラインの上流側に設けられ前記プリフォームを前記搬送ラインに投入するプリフォーム投入部と、
    　前記搬送ラインの下流側に設けられ、前記ペットボトル製造装置によって製造されたペットボトルを取り出すペットボトル取り出し部と、
    　前記ペットボトル取り出し部よりも前記搬送ラインの上流側に設けられたブロー成形部と、
    　前記搬送ラインにおいて前記プリフォーム投入部と前記ブロー成形部との間に設けられ、前記プリフォームを当該ブロー成形部でブロー成形するために必要な加熱を前記プリフォームに対して前記搬送ラインの所定の区間に亘って行うプリフォーム加熱部と、
    　前記プリフォーム加熱部から前記ブロー成形部に至るまでの所定箇所において当該プリフォームに風を当てるプリフォーム風当て部と、
    　前記プリフォームを前記搬送ラインの一定区間に亘って加熱している間及び風を当てている間、当該プリフォームをその軸芯周りに回転させる回転装置と、を有することを特徴とするペットボトル製造装置。     In a PET bottle manufacturing device that manufactures PET bottles by blow molding,
    The PET bottle manufacturing device,
    A transport line for sequentially transporting preforms blow molded as PET bottles at predetermined intervals,
    A preform loading unit that is provided upstream of the transport line and that loads the preform into the transport line;
    A PET bottle removal unit provided on the downstream side of the transport line and for removing a PET bottle manufactured by the PET bottle manufacturing apparatus,
    A blow molding unit provided on the upstream side of the transport line from the PET bottle removal unit,
    The transfer line is provided between the preform input section and the blow molding section, and heat required for blow molding the preform in the blow molding section is applied to the preform by a predetermined amount in the transfer line. A preform heating section performed over a section of
    A preform wind application unit that applies air to the preform at a predetermined position from the preform heating unit to the blow molding unit,
    A rotating device for rotating the preform around its axis while heating the preform over a certain section of the transport line and applying wind. manufacturing device.
  2. 　前記プリフォーム風当て部は、前記プリフォーム加熱部によって前記プリフォームが加熱される過程の少なくとも一部において当該プリフォームに風を当てるように設けられていることを特徴とする請求項１に記載のペットボトル製造装置。 2. The preform wind application unit according to claim 1, wherein the preform air application unit is provided to apply air to the preform in at least a part of a process of heating the preform by the preform heating unit. 3. PET bottle manufacturing equipment.
  3. 　前記プリフォーム風当て部には、前記プリフォームの所定の部分に集中して風を当てる風当てスリットガイドが備わることを特徴とする請求項２に記載のペットボトル製造装置。 3. The PET bottle manufacturing apparatus according to claim 2, wherein the preform wind application unit is provided with an air application slit guide configured to apply air to a predetermined portion of the preform.
  4. 　前記プリフォーム風当て部は、前記プリフォーム加熱部でプリフォームを加熱してからブロー成形部に入るまでの間の所定位置に設けられていることを特徴とする請求項１に記載のペットボトル製造装置。 2. The PET bottle according to claim 1, wherein the preform wind application unit is provided at a predetermined position from when the preform is heated by the preform heating unit to when the preform enters the blow molding unit. 3. manufacturing device.
  5. 　ウォーターサーバー用ペットガロンボトルにブロー成形可能なプリフォームを前記プリフォーム投入部に投入可能なことを特徴とする請求項１乃至請求項４の何れかに記載のペットボトル製造装置。 5. The PET bottle manufacturing apparatus according to claim 1, wherein a preform that can be blow-molded into a PET gallon bottle for a water server can be charged into the preform charging section. 6.
  6. 　略一定の直径を有するペットボトルとは異なる異形形状の特別な形態を有するペットボトルにブロー成形可能なプリフォームを前記プリフォーム投入部に投入可能なことを特徴とする請求項１乃至請求項４の何れかに記載のペットボトル製造装置。 5. A preform which can be blow-molded into a plastic bottle having a special shape different from that of a plastic bottle having a substantially constant diameter and which can be blow-molded into the plastic bottle. The PET bottle manufacturing device according to any one of the above.
  7. 　前記ペットボトル製造装置によるペットボトルの大量生産を可能とするために、前記ブロー成形部が一度に複数本のペットボトルをブロー成形可能な構造となっていることを特徴とする請求項１乃至請求項６の何れかに記載のペットボトル製造装置。 The blow molding unit has a structure capable of blow molding a plurality of PET bottles at a time to enable mass production of PET bottles by the PET bottle manufacturing apparatus. Item 7. A plastic bottle manufacturing apparatus according to any one of Items 6.
  8. 　前記ペットボトル製造装置が耐熱性ペットボトルを製造可能であることを特徴とする請求項１乃至請求項７の何れかに記載のペットボトル製造装置。 The PET bottle manufacturing apparatus according to any one of claims 1 to 7, wherein the PET bottle manufacturing apparatus is capable of manufacturing a heat-resistant PET bottle.
  9. 　前記ポリエチレンテレフタレートでできたプリフォームに代えて、加熱過程において結晶化現象が生じる場合のあるプリフォームを前記プリフォーム投入部に投入可能なことを特徴とする請求項１乃至請求項８の何れかに記載のペットボトル製造装置。
          9. A preform in which a crystallization phenomenon may occur in a heating process, in place of the preform made of polyethylene terephthalate, can be charged into the preform charging section. The PET bottle manufacturing apparatus according to claim 1.
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