WO2013080940A1 - Gripper and heat treatment method - Google Patents

Gripper and heat treatment method Download PDF

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Publication number
WO2013080940A1
WO2013080940A1 PCT/JP2012/080547 JP2012080547W WO2013080940A1 WO 2013080940 A1 WO2013080940 A1 WO 2013080940A1 JP 2012080547 W JP2012080547 W JP 2012080547W WO 2013080940 A1 WO2013080940 A1 WO 2013080940A1
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WO
WIPO (PCT)
Prior art keywords
film
heat treatment
heat
gripping
mass
Prior art date
Application number
PCT/JP2012/080547
Other languages
French (fr)
Japanese (ja)
Inventor
真男 高重
友彰 宮崎
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出光ユニテック株式会社
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Filing date
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Publication of WO2013080940A1 publication Critical patent/WO2013080940A1/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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/20—Edge clamps
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B29C2071/022—Annealing
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0063—Cutting longitudinally
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/28—Storing of extruded material, e.g. by winding up or stacking
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/355—Conveyors for extruded 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/913—Cooling of hollow articles of tubular films externally
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/514—Modifying physical properties
    • B65H2301/5143—Warming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/175—Plastic
    • B65H2701/1752—Polymer film

Definitions

  • the present invention relates to a gripping tool used when heat-treating a film, and a film heat-treating method using the gripping tool.
  • Biaxially stretched nylon films are excellent in puncture strength (pinhole resistance) and impact resistance, and are therefore often used in fields with severe use conditions such as heavy weight packaging and water packaging.
  • the easy tear film which has the property (straight cut property) which can cut a film linearly is developed (for example, patent document 1).
  • a structure of a tenter clip for gripping a film has also been proposed (for example, Patent Document 2), but even if such a tenter clip as described in Patent Document 2 is used, film breakage is sufficiently prevented. I could't.
  • An object of the present invention is to provide a gripping tool capable of preventing film breakage when heat-treating a film and improving continuous film productivity, and a film heat-treating method using the gripping tool.
  • the present invention provides the following gripping tool and a film heat treatment method using the gripping tool. That is, the gripping tool of the present invention is a gripping tool used when heat-treating a film, and the gripping tool includes a base member and a gripping member that grips the film between the base member, The gripping member is provided with an R shape at an end portion at least on the upstream side and the downstream side in the flow direction of the film.
  • the R shape preferably has a radius of curvature of 3 mmR or more and 15 mmR or less.
  • the gripping member is provided with an R shape at the upstream end in the film flow direction. It can be prevented from entering. Therefore, according to this invention, the film breakage at the time of heat-processing to a film can be prevented, and the continuous productivity of a film can be improved.
  • the radius of curvature in the R shape of the gripping part is 5 mmR or more. According to this invention, it is possible to more reliably prevent film breakage when heat-treating the film, and further improve the continuous productivity of the film.
  • the heat treatment method of the present invention is a film heat treatment method in which a film is gripped and heat treated, and the film is gripped using the gripping tool. According to this invention, even if a shrinkage force is generated in the film during the heat treatment, the gripping member of the gripper is provided with an R shape at the upstream end in the film flow direction. It is possible to prevent a notch from entering. Therefore, according to this invention, the film breakage at the time of heat-processing to a film can be prevented, and the continuous productivity of a film can be improved.
  • the heat treatment is performed in two stages of a first heat treatment and a second heat treatment, and it is preferable to use the gripping tool when performing at least the first heat treatment.
  • the first heat treatment after stretching tends to generate a shrinkage force of the film, and a film is likely to be notched. Therefore, it is preferable to use the gripping tool when performing at least the first heat treatment.
  • the film is preferably a biaxially stretched film.
  • the gripping tool that can prevent film breakage when heat-treating the film and can improve the continuous productivity of the film is used, heat treatment can be efficiently performed even for a biaxially stretched film. Can be applied.
  • the film contains nylon 6 (hereinafter also referred to as Ny6) and metaxylylene adipamide (hereinafter also referred to as MXD6) as raw materials, and the raw material contains 40% by mass of Ny6.
  • Ny6 nylon 6
  • MXD6 metaxylylene adipamide
  • the melting point of MXD6 in the product is preferably 233 ° C. or more and 238 ° C. or less
  • the content of the heat history product is preferably 5% by mass or more and 40% by mass or less based on the total amount of raw materials.
  • the gripping tool capable of preventing film breakage when heat-treating the film and improving the continuous productivity of the film is used, even if it is an easily tearable film such as this film, it is efficient. Heat treatment can be performed well.
  • the first heat treatment is a treatment in which heat is applied to the film while gripping both ends in the width direction with respect to the flow direction of the film with the gripper in a tenter method.
  • the heat treatment temperature in one heat treatment is preferably 120 ° C. or more and 190 ° C. or less, and the relaxation rate in the first heat treatment is preferably 15% or less. With such heat treatment conditions, it is possible to prevent film breakage when heat-treating the film and improve continuous productivity of the film.
  • the second heat treatment is a treatment in which heat is applied to the film while gripping both ends in the width direction with respect to the flow direction of the film with the gripping tool by a tenter method.
  • the heat treatment temperature in the second heat treatment is preferably 190 ° C. or higher and 220 ° C. or lower, and the relaxation rate in the second heat treatment is preferably 15% or lower. With such heat treatment conditions, it is possible to prevent film breakage when heat-treating the film and improve continuous productivity of the film.
  • FIG. 1 It is a schematic block diagram which shows an example of the apparatus which manufactures a film using the holding tool concerning embodiment of this invention.
  • FIG. 1 It is a schematic block diagram which shows a 1st heat processing apparatus provided with the holding
  • said 1st heat processing apparatus it is a side view which shows the state before holding a film.
  • the film manufacturing apparatus 100 includes an original fabric manufacturing apparatus 90 for manufacturing the original fabric film 1, a biaxial stretching apparatus (tubular stretching apparatus) 10 that stretches the original fabric film 1, and stretching.
  • a first heat treatment device 20 that preheats a base film 2 that is folded later (hereinafter also simply referred to as “film 2”), a separation device 30 that separates the preheated film 2 into two upper and lower sheets, A second heat treatment device 40 that heat-treats (heat-set) the separated film 2, a tension control device 50 that applies tension to the film 2 from the downstream side when the film 2 is heat-set, and the film 2 is heat-set.
  • a winding device 60 for winding the biaxially stretched nylon film 3 (hereinafter also simply referred to as “film 3”).
  • the raw fabric manufacturing apparatus 90 includes an extruder 91, a circular die 92, a water cooling ring 93, a stabilizer plate 94, and a pinch roll 95.
  • the tubular stretching device 10 is a device for producing a film 2 by biaxially stretching (bubble stretching) a tubular raw film 1 with the pressure of internal air.
  • the tubular stretching device 10 includes a pinch roll 11, a heating unit 12, a guide plate 13, and a pinch roll 14.
  • the first heat treatment apparatus 20 is an apparatus for preliminarily heat-treating the flat film 2.
  • the first heat treatment apparatus 20 includes a tenter 21 and a heating furnace 22.
  • the separation device 30 includes a guide roll 31, a trimming device 32, separation rolls 33A and 33B, and grooved rolls 34A to 34C. Further, the trimming device 32 has a blade 321.
  • the second heat treatment apparatus 40 includes a tenter 41 and a heating furnace 42 as shown in FIG.
  • the tension controller 50 includes guide rolls 51 ⁇ / b> A and 51 ⁇ / b> B and a tension roll 52.
  • the winding device 60 includes a guide roll 61 and a winding roll 62.
  • the first heat treatment apparatus 20 includes the tenter 21 and the heating furnace 22 as described above.
  • the tenter 21 is a means for gripping both ends of the film 2
  • the heating furnace 22 is a heating means for heat-treating the film 2.
  • the heating furnace 22 is a hot air furnace, for example.
  • the tenter 21 includes an introduction part 211 that introduces the film 2, a delivery part 212 that sends out the film 2, and a plurality of gripping tools 70.
  • the gripping tool 70 includes a base member 71 and a gripping member 72 that grips the film 2 between the base member 71.
  • a space is provided between the base member 71 and the gripping member 72 by the introduction portion 211.
  • the film 2 can be introduced into the first heat treatment apparatus 20 by inserting the film 2 at this interval. Further, after the film 2 is introduced into the first heat treatment apparatus 20, there is no space between the base member 71 and the gripping member 72 as shown in FIG. The film 2 can be gripped. Further, when the film 2 is sent out from the first heat treatment apparatus 20, a gap is provided between the base member 71 and the gripping member 72 by the sending unit 212.
  • the gripping member 72 has a curvature radius (R in FIG. 6) of 3 mmR or more and 15 mmR at both ends on the upstream side and the downstream side in the flow direction of the film 2.
  • the following R shapes are provided.
  • this R shape should just be provided in the edge part of the upstream of the flow direction of the film 2 at least.
  • This R shape is also provided on the side of the gripping member 72 that does not contact the film 2 (upper side in FIG. 6), but at least on the side that contacts the film 2 (lower side in FIG. 6). That's fine.
  • the radius of curvature in the R shape is more preferably 5 mmR or more and 12 mmR or less from the viewpoint of preventing film breakage.
  • the second heat treatment apparatus 40 includes a tenter 41 and a heating furnace 42 as described above.
  • the tenter 41 and the heating furnace 42 are the same as the tenter 21 and the heating furnace 22 of the first heat treatment apparatus 20.
  • the gripping tool 70 of the tenter 41 it is preferable to use the same gripping tool 70 as that of the tenter 21 from the viewpoint of more reliably preventing film breakage when the film is subjected to heat treatment.
  • the radius of curvature in the R shape of the gripping member 72 is preferably 3 mmR or more and 15 mmR or less, and more preferably 5 mmR or more and 12 mmR or less from the viewpoint of further improving the continuous productivity of the film.
  • the raw material nylon resin is melt-kneaded by an extruder 91 and extruded into a tube shape by a circular die 92.
  • the tubular molten resin is cooled by a water cooling ring 93.
  • the raw film 1 is formed by rapidly cooling a molten nylon resin as a raw material by a water cooling ring 93.
  • the cooled original film 1 is folded by the stabilizer 94.
  • the folded original fabric film 1 is sent to the next biaxial stretching process by a pinch roll 95 as a flat film.
  • a raw material nylon resin a publicly known one can be used as appropriate.
  • the film 70 at the time of heat-processing to a film can be prevented and the holding tool 70 which can improve the continuous productivity of a film is used, an easily tearable film can be manufactured suitably. Therefore, the raw material of the easily tearable biaxially-stretched nylon film mentioned later is used as a nylon resin which is a raw material.
  • the biaxial stretching is a tubular system, as a result, the raw film 1 is also formed into a tube shape. Therefore, in the tubular molten resin, only the side in contact with the outside air is in direct contact with water.
  • the original film 1 manufactured by the original film manufacturing process is introduced into the apparatus as a flat film by a pinch roll 11.
  • the introduced raw film 1 is bubble-stretched by being heated with infrared rays at the heating unit 12.
  • the film 2 after being bubble-stretched is folded by the guide plate 13.
  • the folded film 2 is pinched by the pinch roll 14 and sent to the next first heat treatment step as a flat film 2.
  • the film 2 sent from the biaxial stretching process is preliminarily heat-treated at a temperature not lower than the shrinkage start temperature of the film 2 and about 30 ° C. lower than the melting point of the film 2 or lower. Sent to the separation process. Specifically, the film 2 is heat-treated by the tenter method while gripping both ends in the width direction with respect to the flow direction of the film 2 with the gripping tool 70.
  • the heat treatment temperature in the first heat treatment is preferably 120 ° C. or higher and 190 ° C. or lower, and the relaxation rate is preferably 15% or lower.
  • the flat film 2 sent through the guide roll 31 is cut into both ends by a blade 321 of a trimming device 32 and separated into two films 2A and 2B.
  • film 2A, 2B is isolate
  • the incision of the flat film 2 may be performed so that a part of the ear is generated by positioning the blade 321 slightly inward from both ends, or by positioning the blade 321 in the fold portion of the film 2. , It may be performed so that the ear does not occur.
  • These films 2A and 2B are overlapped again by three grooved rolls 34A to 34C positioned in order in the film flow direction, and sent to the next second heat treatment step.
  • these grooved rolls 34A to 34C are obtained by plating the surface after the grooved processing. A good contact state between the films 2A and 2B and the air can be obtained through the grooves.
  • the overlapped films 2A and 2B are heat-treated at a temperature equal to or lower than the melting point of the resin constituting the film 2 and about 30 ° C. lower than the melting point while being gripped at both ends by clips (not shown) of the tenter 41. It is (heat-set) and becomes a biaxially stretched nylon film 3 (hereinafter also referred to as film 3) having stable physical properties, and is sent to the next winding step.
  • the film 2 is heat-treated by the tenter method while gripping both ends in the width direction with respect to the flow direction of the film 2 with the gripping tool 70.
  • continuous productivity of a film can further be improved by using the holding tool 70 also in the second heat treatment step.
  • the heat treatment temperature in this second heat treatment is preferably 190 ° C. or higher and 220 ° C. or lower, and the relaxation rate is preferably 15% or lower. Further, a strong tension is applied to the films 2A and 2B in the heating furnace 42 by the tension control device 50 located on the downstream side.
  • the film 3 heat-set in the second heat treatment step is wound as films 3A and 3B on the two winding rolls 62 via the guide roll 61 via the tension control device 50.
  • the ONy film produced in this embodiment contains Ny6 and MXD6 as raw materials, and this raw material contains 40% to 85% by mass of Ny6, 15% to 60% by mass of MXD6 (the total of both is 100%).
  • the melting point of MXD6 in this heat history product is from 233 ° C. to 238 ° C., and the content of the heat history product is a virgin raw material consisting of Ny6 and MXD6 Is 5% by mass or more and 40% by mass or less based on the total amount of raw materials.
  • the chemical formula of Ny6 is shown in the following formula (1)
  • the chemical formula of MXD6 is shown in the following formula (2).
  • the above-mentioned virgin raw material usually means a raw material that is not a mixed raw material having a history in which Ny6 and MXD6 are mixed and melt-kneaded.
  • Ny6 and MXD6 have a history of being melt-kneaded independently (for example, recycled products), they are virgin raw materials when they are not mixed and melt-kneaded.
  • Ny6 and MXD6 have a history of being mixed and melt-kneaded with each other, the kneading is weak, so MXD6 does not have much melting point drop, and if it exceeds 238 ° C., these Ny6 and MXD6 are still It constitutes a virgin raw material, not a heat history product. That is, in this embodiment, three (or two) who added heat history products to Ny6 and MXD6 constituting the virgin raw material are so-called dry blended and then melt-kneaded to constitute an ONy film.
  • the above-mentioned heat history product is a blended product of Ny6 and MXD6, which has passed through the extruder once.
  • the melting point of MXD6 resin is 233 ° C. or higher and 238 by a scanning scanning calorimeter (DSC). The one kept in the range of °C or less is used.
  • the blending ratio of Ny6 and MXD6 in the virgin raw material is from 40% by mass to 85% by mass of Ny6 and from 15% by mass to 60% by mass of MXD6. Are better. And since the heat history product formed by melt-kneading Ny6 and MXD6 with respect to the entire raw material is contained in an amount of 5% by mass or more and 40% by mass or less, the ONy film can be used even under severe conditions. Hard to cause peeling.
  • in-layer peeling refers to a phenomenon that causes peeling in an ONy film (nylon layer) when the ONy film is laminated with an appropriate sealant film and used under severe conditions.
  • the mechanism of delamination is not necessarily clear, but it is considered that Ny6 and MXD6 are oriented in layers in the ONy film, and delamination occurs at the interface.
  • the strength of the laminate film becomes unstable, and there is a risk of problems such as broken bags under severe use conditions when a bag is constructed.
  • Such severe use conditions can be reproduced by, for example, a test for measuring the laminate strength (peel strength) of the laminate film.
  • the melting point of MXD6 in the heat history product is 233 ° C. or higher and 238 ° C. or lower, preferably 235 ° C. or higher and 237 ° C. or lower.
  • the melting point of MXD6 in the heat history product is less than 233 ° C., the linear cut property and impact strength of the easily tearable stretched film are lowered.
  • the melting point of MXD6 in the heat history product exceeds 238 ° C., the effect of preventing in-layer peeling is reduced.
  • the temperature and pressure at the time of kneading are high in the process of manufacturing a heat history product, the melting point of MXD6 in the heat history product is further lowered.
  • the melting point of MXD6 in the heat history product refers to a melting point measured in a state before being melt-kneaded with the virgin raw material.
  • the tear strength is 70 N / cm or less in both the MD direction and the TD direction from the viewpoint of easy tearability. Is preferred.
  • the blending ratio of Ny6 and MXD6 in the heat history product is within this range, the linear cut property, impact strength, and the effect of preventing delamination in the layer are excellent.
  • the first heat treatment apparatus 20 uses the gripping tool 70 that can prevent film breakage when heat-treating the film 2 and can improve the continuous productivity of the film 2, the easily tearable biaxial stretching. Even if it is an easily tearable film like a nylon film, it can heat-process efficiently.
  • the gripping member 72 is provided with R shapes at both ends on the upstream side and the downstream side in the flow direction of the film 2, but the present invention is not limited to this.
  • the gripping member 72 may be provided with an R shape only at the upstream end in the flow direction of the film 2.
  • the biaxially stretched nylon film was manufactured, you may manufacture a uniaxially stretched nylon film.
  • the material of the film may be other than nylon.
  • the tubular system was employ
  • the stretching method may be simultaneous biaxial stretching or sequential biaxial stretching.
  • C Film fusion occurs.
  • (Iii) Straight line cut property The straight line cut property when the film was torn was evaluated according to the following criteria. A: The film can be torn linearly. B: The film can be torn almost linearly. C: The film cannot be torn linearly.
  • Example 1 (Raw film production process) A heat history product that has already been melt-mixed and pelletized at this blending ratio to a virgin raw material obtained by mixing 70% by mass of Ny6 pellets and 30% by mass of MXD6 pellets (with a melting point of MXD6 of 236 ° C) 30% by mass based on the total amount of raw materials (based on the total amount of virgin raw materials and heat history products).
  • a heating unit 12 set temperature: 310 ° C.
  • the starting point was blown with a flow rate of 15 m 3 / min to expand into a bubble, and taken up by a pair of downstream pinch rolls 14 to perform simultaneous biaxial stretching in the MD direction and the TD direction by the tubular method.
  • the magnification during this stretching was 3.0 times in the MD direction and 3.2 times in the TD direction.
  • Examples 2 to 11, Comparative Example 1 A biaxially stretched nylon film was produced in the same manner as in Example 1 except that each condition was changed according to the raw material composition and production conditions shown in Table 1. The linear cut properties of the obtained biaxially stretched nylon films were evaluated. The obtained results are shown in Table 1. In addition, line stability and film fusion in the manufacturing process were evaluated. The obtained results are shown in Table 1.
  • the gripping tool and heat treatment method of the present invention are useful as a technique for producing a film (particularly a biaxially stretched nylon film).
  • the film obtained by this invention is useful as a food packaging material, a pharmaceutical packaging material, an electronic component packaging material, and a daily necessities packaging material.

Abstract

A gripper (70) is used when subjecting a film to heat treatment. The gripper (70) is provided with a base member (71) and a gripping member (72) which grips the film between the gripping member (72) and the base member (71). The gripper (70) is characterized in that a rounded shape is provided to either the upstream-side end and/or the downstream-side end of the gripping member (72) in the flow direction of the film.

Description

把持具および熱処理方法Gripping tool and heat treatment method
　本発明は、フィルムに熱処理を施す際に用いる把持具、並びにそれを用いたフィルムの熱処理方法に関する。 The present invention relates to a gripping tool used when heat-treating a film, and a film heat-treating method using the gripping tool.
　二軸延伸ナイロンフィルムは、突刺強度（耐ピンホール性）や耐衝撃性に優れるため、重量物包装や水物包装など使用条件の厳しい分野で多く使用されている。そして、このような二軸延伸ナイロンフィルムでは、フィルムを直線的にカットできる性質（直線カット性）を有する易裂性フィルムが開発されている（例えば、特許文献１）。
　しかしながら、特に易裂性フィルムなどを製造する場合には、延伸したフィルムに熱処理を施す際に、フィルムを把持する把持具（テンタークリップ）により、フィルムにノッチが入ってフィルム切れが発生するという問題がある。そして、フィルム切れが発生した場合には、製造ラインを止める必要があるために、フィルムの連続生産性の観点で問題があった。
　一方、フィルムを把持するテンタークリップの構造も提案されているが（例えば、特許文献２）、このような特許文献２に記載のようなテンタークリップを用いたとしても、フィルム切れを十分に防止することはできなかった。 Biaxially stretched nylon films are excellent in puncture strength (pinhole resistance) and impact resistance, and are therefore often used in fields with severe use conditions such as heavy weight packaging and water packaging. And in such a biaxially stretched nylon film, the easy tear film which has the property (straight cut property) which can cut a film linearly is developed (for example, patent document 1).
However, especially when manufacturing easily tearable films, when a heat treatment is performed on a stretched film, the film is notched due to a notch in the film caused by a gripping tool (tenter clip) that grips the film. There is. And when the film breakage occurs, it is necessary to stop the production line, which causes a problem in terms of continuous productivity of the film.
On the other hand, a structure of a tenter clip for gripping a film has also been proposed (for example, Patent Document 2), but even if such a tenter clip as described in Patent Document 2 is used, film breakage is sufficiently prevented. I couldn't.
特開平６－１０６６１９号公報JP-A-6-106619 特開昭５８－２１４５７４号公報JP 58-214574 A
　本発明は、フィルムに熱処理を施す際のフィルム切れを防止でき、フィルムの連続生産性を向上できる把持具、並びにそれを用いたフィルムの熱処理方法を提供することを目的とする。 An object of the present invention is to provide a gripping tool capable of preventing film breakage when heat-treating a film and improving continuous film productivity, and a film heat-treating method using the gripping tool.
　前記課題を解決すべく、本発明は、以下のような把持具およびそれを用いたフィルムの熱処理方法を提供するものである。
　すなわち、本発明の把持具は、フィルムに熱処理を施す際に用いる把持具であって、前記把持具は、基体部材と、この基体部材との間で前記フィルムを把持する把持部材とを備え、前記把持部材には、前記フィルムの流れ方向における上流側および下流側のうち少なくとも上流側の端部にＲ形状が設けられていることを特徴とするものである。
　ここで、前記Ｒ形状が、曲率半径が３ｍｍＲ以上１５ｍｍＲ以下であることが好ましい。
　この発明によれば、熱処理時にフィルムに収縮力が発生しても、前記把持部材には、前記フィルムの流れ方向における上流側の端部にＲ形状が設けられているために、フィルムにノッチが入るのを防止できる。そのため、この発明によれば、フィルムに熱処理を施す際のフィルム切れを防止でき、フィルムの連続生産性を向上できる。 In order to solve the above-mentioned problems, the present invention provides the following gripping tool and a film heat treatment method using the gripping tool.
That is, the gripping tool of the present invention is a gripping tool used when heat-treating a film, and the gripping tool includes a base member and a gripping member that grips the film between the base member, The gripping member is provided with an R shape at an end portion at least on the upstream side and the downstream side in the flow direction of the film.
Here, the R shape preferably has a radius of curvature of 3 mmR or more and 15 mmR or less.
According to this invention, even if a shrinkage force is generated in the film during heat treatment, the gripping member is provided with an R shape at the upstream end in the film flow direction. It can be prevented from entering. Therefore, according to this invention, the film breakage at the time of heat-processing to a film can be prevented, and the continuous productivity of a film can be improved.
　本発明の把持具においては、前記把持部のＲ形状における曲率半径が、５ｍｍＲ以上であることが好ましい。
　この発明によれば、フィルムに熱処理を施す際のフィルム切れをより確実に防止でき、フィルムの連続生産性を更に向上できる。 In the gripping tool of the present invention, it is preferable that the radius of curvature in the R shape of the gripping part is 5 mmR or more.
According to this invention, it is possible to more reliably prevent film breakage when heat-treating the film, and further improve the continuous productivity of the film.
　本発明の熱処理方法は、フィルムを把持して熱処理を施すフィルムの熱処理方法であって、前記把持具を用いて、前記フィルムを把持することを特徴とする方法である。
　この発明によれば、熱処理時にフィルムに収縮力が発生しても、前記把持具の把持部材には、前記フィルムの流れ方向における上流側の端部にＲ形状が設けられているために、フィルムにノッチが入るのを防止できる。そのため、この発明によれば、フィルムに熱処理を施す際のフィルム切れを防止でき、フィルムの連続生産性を向上できる。 The heat treatment method of the present invention is a film heat treatment method in which a film is gripped and heat treated, and the film is gripped using the gripping tool.
According to this invention, even if a shrinkage force is generated in the film during the heat treatment, the gripping member of the gripper is provided with an R shape at the upstream end in the film flow direction. It is possible to prevent a notch from entering. Therefore, according to this invention, the film breakage at the time of heat-processing to a film can be prevented, and the continuous productivity of a film can be improved.
　本発明の熱処理方法においては、前記熱処理は、第一熱処理および第二熱処理の２段階で施され、少なくとも前記第一熱処理を施す際には、前記把持具を用いることが好ましい。
　このように、２段階で熱処理を施す場合には、延伸後の第一熱処理では、フィルムの収縮力が発生しやすく、フィルムにノッチが入りやすくなる。そこで、少なくとも前記第一熱処理を施す際には、前記把持具を用いることが好ましい。 In the heat treatment method of the present invention, the heat treatment is performed in two stages of a first heat treatment and a second heat treatment, and it is preferable to use the gripping tool when performing at least the first heat treatment.
As described above, when the heat treatment is performed in two stages, the first heat treatment after stretching tends to generate a shrinkage force of the film, and a film is likely to be notched. Therefore, it is preferable to use the gripping tool when performing at least the first heat treatment.
　本発明の熱処理方法においては、前記フィルムは、二軸延伸後のフィルムであることが好ましい。
　この発明においては、フィルムに熱処理を施す際のフィルム切れを防止でき、フィルムの連続生産性を向上できる前記把持具を用いているために、二軸延伸後のフィルムであっても効率よく熱処理を施すことができる。 In the heat treatment method of the present invention, the film is preferably a biaxially stretched film.
In the present invention, since the gripping tool that can prevent film breakage when heat-treating the film and can improve the continuous productivity of the film is used, heat treatment can be efficiently performed even for a biaxially stretched film. Can be applied.
　本発明の熱処理方法においては、前記フィルムは、ナイロン６（以後、Ｎｙ６ともいう）とメタキシリレンアジパミド（以後、ＭＸＤ６ともいう）とを原料として含み、前記原料は、Ｎｙ６が４０質量％から８５質量％まで、ＭＸＤ６が１５質量％から６０質量％まで（両者の合計は１００質量％）からなるバージン原料と、Ｎｙ６およびＭＸＤ６を溶融混練してなる熱履歴品とを含み、前記熱履歴品におけるＭＸＤ６の融点は、２３３℃以上２３８℃以下であり、かつ、前記熱履歴品の含有量は、原料全量基準で５質量％以上４０質量％以下であることが好ましい。
　この発明においては、フィルムに熱処理を施す際のフィルム切れを防止でき、フィルムの連続生産性を向上できる前記把持具を用いているために、このフィルムのように易裂性フィルムであっても効率よく熱処理を施すことができる。 In the heat treatment method of the present invention, the film contains nylon 6 (hereinafter also referred to as Ny6) and metaxylylene adipamide (hereinafter also referred to as MXD6) as raw materials, and the raw material contains 40% by mass of Ny6. To 85 mass%, MXD6 from 15 mass% to 60 mass% (the total of both is 100 mass%), and a heat history product obtained by melt-kneading Ny6 and MXD6, The melting point of MXD6 in the product is preferably 233 ° C. or more and 238 ° C. or less, and the content of the heat history product is preferably 5% by mass or more and 40% by mass or less based on the total amount of raw materials.
In the present invention, since the gripping tool capable of preventing film breakage when heat-treating the film and improving the continuous productivity of the film is used, even if it is an easily tearable film such as this film, it is efficient. Heat treatment can be performed well.
　本発明の熱処理方法においては、前記第一熱処理は、テンター方式にて、前記フィルムの流れ方向に対する幅方向の両端を前記把持具で把持しながら、前記フィルムに熱をかける処理であり、前記第一熱処理における熱処理温度は、１２０℃以上１９０℃以下であり、かつ、前記第一熱処理における弛緩率は、１５％以下であることが好ましい。
　このような熱処理条件であれば、フィルムに熱処理を施す際のフィルム切れを防止でき、フィルムの連続生産性を向上できる。 In the heat treatment method of the present invention, the first heat treatment is a treatment in which heat is applied to the film while gripping both ends in the width direction with respect to the flow direction of the film with the gripper in a tenter method. The heat treatment temperature in one heat treatment is preferably 120 ° C. or more and 190 ° C. or less, and the relaxation rate in the first heat treatment is preferably 15% or less.
With such heat treatment conditions, it is possible to prevent film breakage when heat-treating the film and improve continuous productivity of the film.
　本発明の熱処理方法においては、前記第二熱処理は、テンター方式にて、前記フィルムの流れ方向に対する幅方向の両端を前記把持具で把持しながら、前記フィルムに熱をかける処理であり、前記第二熱処理における熱処理温度は、１９０℃以上２２０℃以下であり、かつ、前記第二熱処理における弛緩率は、１５％以下であることが好ましい。
　このような熱処理条件であれば、フィルムに熱処理を施す際のフィルム切れを防止でき、フィルムの連続生産性を向上できる。 In the heat treatment method of the present invention, the second heat treatment is a treatment in which heat is applied to the film while gripping both ends in the width direction with respect to the flow direction of the film with the gripping tool by a tenter method. The heat treatment temperature in the second heat treatment is preferably 190 ° C. or higher and 220 ° C. or lower, and the relaxation rate in the second heat treatment is preferably 15% or lower.
With such heat treatment conditions, it is possible to prevent film breakage when heat-treating the film and improve continuous productivity of the film.
本発明の実施形態にかかる把持具を用いてフィルムを製造する装置の一例を示す概略構成図である。It is a schematic block diagram which shows an example of the apparatus which manufactures a film using the holding tool concerning embodiment of this invention. 前記実施形態の把持具を備える第一熱処理装置を示す概略構成図である。It is a schematic block diagram which shows a 1st heat processing apparatus provided with the holding | gripping tool of the said embodiment. 前記第一熱処理装置において、フィルムを把持する前の状態を示す側面図である。In said 1st heat processing apparatus, it is a side view which shows the state before holding a film. 前記第一熱処理装置において、フィルムを把持した状態を示す側面図である。It is a side view which shows the state which hold | gripped the film in said 1st heat processing apparatus. 前記実施形態の把持具を示す斜視図である。It is a perspective view which shows the holding tool of the said embodiment. 前記実施形態の把持具における把持部材の端部近傍を示す拡大正面図である。It is an enlarged front view which shows the edge part vicinity of the holding member in the holding tool of the said embodiment.
　以下、本発明の実施形態を図面に基づいて説明する。
　［フィルムの製造装置］
　先ず、本発明の把持具を用いてフィルムを製造する装置について、一例を挙げて説明する。
　フィルム製造装置１００は、図１に示すように、原反フィルム１を製造するための原反製造装置９０と、原反フィルム１を延伸する二軸延伸装置（チューブラー延伸装置）１０と、延伸後に折り畳まれた基材フィルム２（以後、単に「フィルム２」ともいう）を予熱する第一熱処理装置２０（予熱炉）と、予熱されたフィルム２を上下２枚に分離する分離装置３０と、分離されたフィルム２を熱処理（熱固定）する第二熱処理装置４０と、フィルム２が熱固定されるときに、下流側からフィルム２に張力を加える張力制御装置５０と、フィルム２が熱固定されてなる二軸延伸ナイロンフィルム３（以後、単に「フィルム３」ともいう）を巻き取る巻取装置６０とを備えている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Film production equipment]
First, an example of an apparatus for producing a film using the gripping tool of the present invention will be described.
As shown in FIG. 1, the film manufacturing apparatus 100 includes an original fabric manufacturing apparatus 90 for manufacturing the original fabric film 1, a biaxial stretching apparatus (tubular stretching apparatus) 10 that stretches the original fabric film 1, and stretching. A first heat treatment device 20 (preheating furnace) that preheats a base film 2 that is folded later (hereinafter also simply referred to as “film 2”), a separation device 30 that separates the preheated film 2 into two upper and lower sheets, A second heat treatment device 40 that heat-treats (heat-set) the separated film 2, a tension control device 50 that applies tension to the film 2 from the downstream side when the film 2 is heat-set, and the film 2 is heat-set. And a winding device 60 for winding the biaxially stretched nylon film 3 (hereinafter also simply referred to as “film 3”).
　原反製造装置９０は、図１に示すように、押出機９１と、サーキュラーダイス９２と、水冷リング９３と、安定板９４と、ピンチロール９５とを備えている。
　チューブラー延伸装置１０は、チューブ状の原反フィルム１を内部空気の圧力により二軸延伸（バブル延伸）してフィルム２を製造するための装置である。このチューブラー延伸装置１０は、図１に示すように、ピンチロール１１と、加熱部１２と、案内板１３と、ピンチロール１４とを備えている。
　第一熱処理装置２０は、扁平となったフィルム２を予備的に熱処理するための装置である。第一熱処理装置２０は、図１に示すように、テンター２１と、加熱炉２２とを備えている。
　分離装置３０は、図１に示すように、ガイドロール３１と、トリミング装置３２と、分離ロール３３Ａ，３３Ｂと、溝付ロール３４Ａ～３４Ｃとを備えている。また、トリミング装置３２は、ブレード３２１を有している。 As shown in FIG. 1, the raw fabric manufacturing apparatus 90 includes an extruder 91, a circular die 92, a water cooling ring 93, a stabilizer plate 94, and a pinch roll 95.
The tubular stretching device 10 is a device for producing a film 2 by biaxially stretching (bubble stretching) a tubular raw film 1 with the pressure of internal air. As shown in FIG. 1, the tubular stretching device 10 includes a pinch roll 11, a heating unit 12, a guide plate 13, and a pinch roll 14.
The first heat treatment apparatus 20 is an apparatus for preliminarily heat-treating the flat film 2. As shown in FIG. 1, the first heat treatment apparatus 20 includes a tenter 21 and a heating furnace 22.
As shown in FIG. 1, the separation device 30 includes a guide roll 31, a trimming device 32, separation rolls 33A and 33B, and grooved rolls 34A to 34C. Further, the trimming device 32 has a blade 321.
　第二熱処理装置４０は、図１に示すように、テンター４１と、加熱炉４２とを備えている。
　張力制御装置５０は、図１に示すように、ガイドロール５１Ａ，５１Ｂと、張力ロール５２とを備えている。
　巻取装置６０は、図１に示すように、ガイドロール６１と、巻取ロール６２とを備えている。 The second heat treatment apparatus 40 includes a tenter 41 and a heating furnace 42 as shown in FIG.
As shown in FIG. 1, the tension controller 50 includes guide rolls 51 </ b> A and 51 </ b> B and a tension roll 52.
As shown in FIG. 1, the winding device 60 includes a guide roll 61 and a winding roll 62.
　ここで、本発明の熱処理方法を実施できる第一熱処理装置２０および第二熱処理装置４０について詳細に説明する。
　第一熱処理装置２０は、前述の通り、テンター２１と、加熱炉２２とを備えている。テンター２１は、フィルム２の両端部を把持する手段であり、加熱炉２２は、フィルム２を熱処理するための加熱手段である。この加熱炉２２は、例えば熱風炉である。
　テンター２１は、図２に示すように、フィルム２を導入する導入部２１１と、フィルム２を送り出す送出部２１２と、複数の把持具７０と、を備えている。 Here, the 1st heat processing apparatus 20 and the 2nd heat processing apparatus 40 which can implement the heat processing method of this invention are demonstrated in detail.
The first heat treatment apparatus 20 includes the tenter 21 and the heating furnace 22 as described above. The tenter 21 is a means for gripping both ends of the film 2, and the heating furnace 22 is a heating means for heat-treating the film 2. The heating furnace 22 is a hot air furnace, for example.
As shown in FIG. 2, the tenter 21 includes an introduction part 211 that introduces the film 2, a delivery part 212 that sends out the film 2, and a plurality of gripping tools 70.
把持具７０は、図３から図５に示すように、基体部材７１と、この基体部材７１との間でフィルム２を把持する把持部材７２とを備えている。
　テンター２１においては、図３に示すように、導入部２１１により基体部材７１と把持部材７２との間に間隔が設けられる。この間隔に、フィルム２が挿入されることで、フィルム２を第一熱処理装置２０に導入することができる。また、フィルム２を第一熱処理装置２０に導入された後には、図４に示すように、基体部材７１と把持部材７２との間に間隔がなくなり、基体部材７１と把持部材７２との間でフィルム２を把持できる。また、フィルム２を第一熱処理装置２０から送り出す際には、送出部２１２により基体部材７１と把持部材７２との間に間隔が設けられる。 As shown in FIGS. 3 to 5, the gripping tool 70 includes a base member 71 and a gripping member 72 that grips the film 2 between the base member 71.
In the tenter 21, as shown in FIG. 3, a space is provided between the base member 71 and the gripping member 72 by the introduction portion 211. The film 2 can be introduced into the first heat treatment apparatus 20 by inserting the film 2 at this interval. Further, after the film 2 is introduced into the first heat treatment apparatus 20, there is no space between the base member 71 and the gripping member 72 as shown in FIG. The film 2 can be gripped. Further, when the film 2 is sent out from the first heat treatment apparatus 20, a gap is provided between the base member 71 and the gripping member 72 by the sending unit 212.
　この把持具７０において、図５および図６に示すように、把持部材７２には、フィルム２の流れ方向における上流側および下流側の両端部に、曲率半径（図６のＲ）が３ｍｍＲ以上１５ｍｍＲ以下のＲ形状が設けられている。なお、このＲ形状は、フィルム２の流れ方向における少なくとも上流側の端部に設けられていればよい。また、このＲ形状は、把持部材７２におけるフィルム２と接触しない側（図６の上側）にも設けられているが、少なくともフィルム２と接触する側（図６の下側）に設けられていればよい。このように、把持部材７２にＲ形状が設けられているために、フィルム２に熱処理を施す際のフィルム切れを防止できる。
　このＲ形状における曲率半径は、フィルム切れの防止の観点から、５ｍｍＲ以上１２ｍｍＲ以下であることがより好ましい。 In this gripping tool 70, as shown in FIGS. 5 and 6, the gripping member 72 has a curvature radius (R in FIG. 6) of 3 mmR or more and 15 mmR at both ends on the upstream side and the downstream side in the flow direction of the film 2. The following R shapes are provided. In addition, this R shape should just be provided in the edge part of the upstream of the flow direction of the film 2 at least. This R shape is also provided on the side of the gripping member 72 that does not contact the film 2 (upper side in FIG. 6), but at least on the side that contacts the film 2 (lower side in FIG. 6). That's fine. Thus, since the grip member 72 is provided with an R shape, it is possible to prevent the film from being cut when the film 2 is heat-treated.
The radius of curvature in the R shape is more preferably 5 mmR or more and 12 mmR or less from the viewpoint of preventing film breakage.
　第二熱処理装置４０は、前述の通り、テンター４１と、加熱炉４２とを備えている。そして、テンター４１および加熱炉４２は、第一熱処理装置２０のテンター２１および加熱炉２２と同様のものである。また、テンター４１の把持具７０についても、フィルムに熱処理を施す際のフィルム切れをより確実に防止するという観点から、テンター２１の把持具７０と同様のものを用いることが好ましい。この場合、把持部材７２にＲ形状における曲率半径は、フィルムの連続生産性をさらに向上させるという観点から、３ｍｍＲ以上１５ｍｍＲ以下であることが好ましく、５ｍｍＲ以上１２ｍｍＲ以下であることがより好ましい。 The second heat treatment apparatus 40 includes a tenter 41 and a heating furnace 42 as described above. The tenter 41 and the heating furnace 42 are the same as the tenter 21 and the heating furnace 22 of the first heat treatment apparatus 20. Further, as the gripping tool 70 of the tenter 41, it is preferable to use the same gripping tool 70 as that of the tenter 21 from the viewpoint of more reliably preventing film breakage when the film is subjected to heat treatment. In this case, the radius of curvature in the R shape of the gripping member 72 is preferably 3 mmR or more and 15 mmR or less, and more preferably 5 mmR or more and 12 mmR or less from the viewpoint of further improving the continuous productivity of the film.
　［フィルムの製造方法］
　次に、このフィルム製造装置１００を用いて二軸延伸ナイロンフィルムを製造する各工程を詳細に説明する。 [Film Production Method]
Next, each process which manufactures a biaxially-stretched nylon film using this film manufacturing apparatus 100 is demonstrated in detail.
　（原反フィルム製造工程）
　原料であるナイロン樹脂は、図１に示すように、押出機９１により溶融混練され、サーキュラーダイス９２によりチューブ状に押し出される。チューブ状の溶融樹脂は、水冷リング９３により冷却される。原反フィルム１は原料である溶融ナイロン樹脂が水冷リング９３により急冷されることで成形される。冷却された原反フィルム１は、安定板９４により折り畳まれる。折り畳まれた原反フィルム１は、ピンチロール９５により、扁平なフィルムとして次の二軸延伸工程に送られる。
　ここで、原料であるナイロン樹脂としては、適宜公知のものを用いることができる。なお、本実施形態では、フィルムに熱処理を施す際のフィルム切れを防止でき、フィルムの連続生産性を向上できる把持具７０を用いているので、易裂性フィルムを好適に製造することができる。そのため、原料であるナイロン樹脂として、後述する易裂性二軸延伸ナイロンフィルムの原料を用いている。 (Raw film production process)
As shown in FIG. 1, the raw material nylon resin is melt-kneaded by an extruder 91 and extruded into a tube shape by a circular die 92. The tubular molten resin is cooled by a water cooling ring 93. The raw film 1 is formed by rapidly cooling a molten nylon resin as a raw material by a water cooling ring 93. The cooled original film 1 is folded by the stabilizer 94. The folded original fabric film 1 is sent to the next biaxial stretching process by a pinch roll 95 as a flat film.
Here, as a raw material nylon resin, a publicly known one can be used as appropriate. In addition, in this embodiment, since the film 70 at the time of heat-processing to a film can be prevented and the holding tool 70 which can improve the continuous productivity of a film is used, an easily tearable film can be manufactured suitably. Therefore, the raw material of the easily tearable biaxially-stretched nylon film mentioned later is used as a nylon resin which is a raw material.
　本実施形態では、二軸延伸がチューブラー方式であるので、結果的に原反フィルム１もチューブ状に成形される。それ故、チューブ状溶融樹脂において、水に直接接触するのは外気に接している側だけである。 In the present embodiment, since the biaxial stretching is a tubular system, as a result, the raw film 1 is also formed into a tube shape. Therefore, in the tubular molten resin, only the side in contact with the outside air is in direct contact with water.
　（二軸延伸工程）
　原反フィルム製造工程により製造された原反フィルム１は、図１に示すように、ピンチロール１１により、扁平なフィルムとして装置内部に導入される。導入された原反フィルム１は、加熱部１２で赤外線により加熱することでバブル延伸される。その後、バブル延伸された後のフィルム２は、案内板１３により折り畳まれる。折り畳まれたフィルム２は、ピンチロール１４によりピンチされ扁平なフィルム２として次の第一熱処理工程に送られる。 (Biaxial stretching process)
As shown in FIG. 1, the original film 1 manufactured by the original film manufacturing process is introduced into the apparatus as a flat film by a pinch roll 11. The introduced raw film 1 is bubble-stretched by being heated with infrared rays at the heating unit 12. Thereafter, the film 2 after being bubble-stretched is folded by the guide plate 13. The folded film 2 is pinched by the pinch roll 14 and sent to the next first heat treatment step as a flat film 2.
　（第一熱処理工程）
　二軸延伸工程から送られたフィルム２は、このフィルム２の収縮開始温度以上であって、フィルム２の融点よりも約３０℃低い温度かそれ以下の温度でこのフィルム２を予め熱処理されて次の分離工程に送られる。
　具体的には、テンター方式にて、フィルム２の流れ方向に対する幅方向の両端を把持具７０で把持しながら、フィルム２に熱処理が施される。
　この第一熱処理における熱処理温度は、１２０℃以上１９０℃以下であり、かつ、弛緩率は、１５％以下であることが好ましい。
　この第一熱処理工程により、フィルム２の結晶化度が増して、重なり合ったフィルム同士の滑り性が良好になる。 (First heat treatment process)
The film 2 sent from the biaxial stretching process is preliminarily heat-treated at a temperature not lower than the shrinkage start temperature of the film 2 and about 30 ° C. lower than the melting point of the film 2 or lower. Sent to the separation process.
Specifically, the film 2 is heat-treated by the tenter method while gripping both ends in the width direction with respect to the flow direction of the film 2 with the gripping tool 70.
The heat treatment temperature in the first heat treatment is preferably 120 ° C. or higher and 190 ° C. or lower, and the relaxation rate is preferably 15% or lower.
By this first heat treatment step, the crystallinity of the film 2 is increased, and the slipping property between the overlapping films is improved.
　（分離工程）
　ガイドロール３１を介して送られた扁平なフィルム２は、図１に示すように、トリミング装置３２のブレード３２１により、両端部を切開されて２枚のフィルム２Ａ，２Ｂに分離される。そして、フィルム２Ａ，２Ｂは、上下に離れて位置する一対の分離ロール３３Ａ、３３Ｂにより、フィルム２Ａ，２Ｂの間に空気を介在させながらこれらを分離される。この扁平なフィルム２の切開は、両端部から若干内側にブレード３２１を位置させることにより、一部分耳部が生じるように行ってもよく、或いは、フィルム２の折り目部分にブレード３２１を位置させることにより、耳部が生じないように行ってもよい。
　これらのフィルム２Ａ，２Ｂは、フィルムの流れ方向に順に位置する３個の溝付ロール３４Ａから３４Ｃにより、再び重ねられて次の第二熱処理工程に送られる。なお、これらの溝付ロール３４Ａから３４Ｃは、溝付き加工後、表面にめっき処理を施したものである。この溝を介してフィルム２Ａ、２Ｂと空気との良好な接触状態が得られる。 (Separation process)
As shown in FIG. 1, the flat film 2 sent through the guide roll 31 is cut into both ends by a blade 321 of a trimming device 32 and separated into two films 2A and 2B. And film 2A, 2B is isolate | separated, interposing air between film 2A, 2B by a pair of separation roll 33A, 33B located up and down apart. The incision of the flat film 2 may be performed so that a part of the ear is generated by positioning the blade 321 slightly inward from both ends, or by positioning the blade 321 in the fold portion of the film 2. , It may be performed so that the ear does not occur.
These films 2A and 2B are overlapped again by three grooved rolls 34A to 34C positioned in order in the film flow direction, and sent to the next second heat treatment step. In addition, these grooved rolls 34A to 34C are obtained by plating the surface after the grooved processing. A good contact state between the films 2A and 2B and the air can be obtained through the grooves.
　（第二熱処理工程）
　重なった状態のフィルム２Ａ、２Ｂは、テンター４１のクリップ（図示せず）で両端部を把持されながら、フィルム２を構成する樹脂の融点以下であって、融点から約３０℃低い温度以上で熱処理（熱固定）され、物性の安定した二軸延伸ナイロンフィルム３（以後、フィルム３ともいう）となり、次の巻取工程に送られる。
　具体的には、テンター方式にて、フィルム２の流れ方向に対する幅方向の両端を把持具７０で把持しながら、フィルム２に熱処理が施される。なお、このように第二熱処理工程でも、把持具７０を用いることで、フィルムの連続生産性をさらに向上できる。
　この第二熱処理における熱処理温度は、１９０℃以上２２０℃以下であり、かつ、弛緩率は、１５％以下であることが好ましい。
　また、加熱炉４２内のフィルム２Ａ、２Ｂに対しては、下流側に位置する張力制御装置５０により強い張力が加えられるようになっている。 (Second heat treatment process)
The overlapped films 2A and 2B are heat-treated at a temperature equal to or lower than the melting point of the resin constituting the film 2 and about 30 ° C. lower than the melting point while being gripped at both ends by clips (not shown) of the tenter 41. It is (heat-set) and becomes a biaxially stretched nylon film 3 (hereinafter also referred to as film 3) having stable physical properties, and is sent to the next winding step.
Specifically, the film 2 is heat-treated by the tenter method while gripping both ends in the width direction with respect to the flow direction of the film 2 with the gripping tool 70. In addition, continuous productivity of a film can further be improved by using the holding tool 70 also in the second heat treatment step.
The heat treatment temperature in this second heat treatment is preferably 190 ° C. or higher and 220 ° C. or lower, and the relaxation rate is preferably 15% or lower.
Further, a strong tension is applied to the films 2A and 2B in the heating furnace 42 by the tension control device 50 located on the downstream side.
　（巻取工程）
　第二熱処理工程により熱固定されたフィルム３は、張力制御装置５０を経て、ガイドロール６１を介して２本の巻取ロール６２に、フィルム３Ａ，３Ｂとして巻き取られる。 (Winding process)
The film 3 heat-set in the second heat treatment step is wound as films 3A and 3B on the two winding rolls 62 via the guide roll 61 via the tension control device 50.
　［易裂性二軸延伸ナイロンフィルム］
　次に、本実施形態で作製した易裂性二軸延伸ナイロンフィルム（以下、単に「ＯＮｙフィルム」ともいう。）について説明する。
　本実施形態で作製したＯＮｙフィルムは、Ｎｙ６とＭＸＤ６とを原料として含み、この原料は、Ｎｙ６が４０質量％から８５質量％まで、ＭＸＤ６が１５質量％から６０質量％まで（両者の合計は１００質量％）からなるバージン原料と、Ｎｙ６およびＭＸＤ６を溶融混練してなる熱履歴品とを含み、この熱履歴品におけるＭＸＤ６の融点が２３３℃から２３８℃までで、かつ、熱履歴品の含有量が原料全量基準で５質量％以上４０質量％以下である。
　ここで、Ｎｙ６の化学式を下記式（１）に示し、ＭＸＤ６の化学式を下記式（２）に示す。 [Easily tearable biaxially stretched nylon film]
Next, the easily tearable biaxially stretched nylon film (hereinafter, also simply referred to as “ONy film”) produced in the present embodiment will be described.
The ONy film produced in this embodiment contains Ny6 and MXD6 as raw materials, and this raw material contains 40% to 85% by mass of Ny6, 15% to 60% by mass of MXD6 (the total of both is 100%). The melting point of MXD6 in this heat history product is from 233 ° C. to 238 ° C., and the content of the heat history product is a virgin raw material consisting of Ny6 and MXD6 Is 5% by mass or more and 40% by mass or less based on the total amount of raw materials.
Here, the chemical formula of Ny6 is shown in the following formula (1), and the chemical formula of MXD6 is shown in the following formula (2).
Figure JPOXMLDOC01-appb-C000001
Figure JPOXMLDOC01-appb-C000001
Figure JPOXMLDOC01-appb-C000002
Figure JPOXMLDOC01-appb-C000002
　上述のバージン原料とは、通常は、Ｎｙ６とＭＸＤ６とが互いに混合され溶融混練された履歴を持つ混合原料ではない状態の原料を意味する。例えば、Ｎｙ６やＭＸＤ６が各々単独で溶融混練された履歴があっても（例えばリサイクル品）、これらが混合され溶融混練されていない場合は、バージン原料である。ただし、ＯＮｙフィルムとなったときの物性の面からは、リサイクル回数のできるだけ少ないバージン原料を用いることが好ましい。なお、Ｎｙ６とＭＸＤ６とが互いに混合され溶融混練された履歴を持っていても、その混練が弱いため、ＭＸＤ６の融点降下があまりなく、２３８℃を超えていれば、これらのＮｙ６とＭＸＤ６は依然としてバージン原料を構成するものであって、熱履歴品を構成するものではない。
　すなわち、本実施形態では、バージン原料を構成するＮｙ６とＭＸＤ６に熱履歴品を加えた三者（あるいは二者）がいわゆるドライブレンドされた後に溶融混練されてＯＮｙフィルムを構成する。
　上述の熱履歴品とは、Ｎｙ６とＭＸＤ６の配合品で、一度押出機を通過したものをいい、本発明については、示査走査熱量計（ＤＳＣ）でＭＸＤ６樹脂の融点が２３３℃以上、２３８℃以下の範囲に保持されたものを用いる。 The above-mentioned virgin raw material usually means a raw material that is not a mixed raw material having a history in which Ny6 and MXD6 are mixed and melt-kneaded. For example, even if Ny6 and MXD6 have a history of being melt-kneaded independently (for example, recycled products), they are virgin raw materials when they are not mixed and melt-kneaded. However, from the viewpoint of physical properties when it becomes an ONy film, it is preferable to use a virgin raw material with as few times of recycling as possible. Even if Ny6 and MXD6 have a history of being mixed and melt-kneaded with each other, the kneading is weak, so MXD6 does not have much melting point drop, and if it exceeds 238 ° C., these Ny6 and MXD6 are still It constitutes a virgin raw material, not a heat history product.
That is, in this embodiment, three (or two) who added heat history products to Ny6 and MXD6 constituting the virgin raw material are so-called dry blended and then melt-kneaded to constitute an ONy film.
The above-mentioned heat history product is a blended product of Ny6 and MXD6, which has passed through the extruder once. In the present invention, the melting point of MXD6 resin is 233 ° C. or higher and 238 by a scanning scanning calorimeter (DSC). The one kept in the range of ℃ or less is used.
　本実施形態で作製したＯＮｙフィルムは、バージン原料におけるＮｙ６とＭＸＤ６の配合割合が、Ｎｙ６が４０質量％から８５質量％まで、ＭＸＤ６が１５質量％から６０質量％までであるので、直線カット性に優れている。そして、原料全体に対して、Ｎｙ６およびＭＸＤ６を溶融混練してなる熱履歴品が５質量％以上、４０質量％以下含まれているので、ＯＮｙフィルムを過酷な条件下で使用しても層内剥離を起こしにくい。
　ここで、層内剥離とは、ＯＮｙフィルムを適当なシーラントフィルムとラミネートした後に過酷な条件で使用すると、ＯＮｙフィルム（ナイロン層）内で剥離を引き起こす現象をいう。層内剥離の機構は必ずしも明確ではないが、ＯＮｙフィルム内では、Ｎｙ６とＭＸＤ６が層状に配向しており、その界面で剥離が起こるものと考えられる。
　このような層内剥離が起こると、ラミネートフィルムの強度が不安定となり、袋を構成した場合に過酷な使用条件下では破袋等の問題を生ずるおそれがある。このような過酷な使用条件は、例えば、ラミネートフィルムのラミネート強度（剥離強度）を測定する試験により再現することができる。 In the ONy film produced in this embodiment, the blending ratio of Ny6 and MXD6 in the virgin raw material is from 40% by mass to 85% by mass of Ny6 and from 15% by mass to 60% by mass of MXD6. Are better. And since the heat history product formed by melt-kneading Ny6 and MXD6 with respect to the entire raw material is contained in an amount of 5% by mass or more and 40% by mass or less, the ONy film can be used even under severe conditions. Hard to cause peeling.
Here, in-layer peeling refers to a phenomenon that causes peeling in an ONy film (nylon layer) when the ONy film is laminated with an appropriate sealant film and used under severe conditions. The mechanism of delamination is not necessarily clear, but it is considered that Ny6 and MXD6 are oriented in layers in the ONy film, and delamination occurs at the interface.
When such delamination occurs, the strength of the laminate film becomes unstable, and there is a risk of problems such as broken bags under severe use conditions when a bag is constructed. Such severe use conditions can be reproduced by, for example, a test for measuring the laminate strength (peel strength) of the laminate film.
　また、熱履歴品におけるＭＸＤ６の融点は２３３℃以上、２３８℃以下であり、好ましくは２３５℃以上、２３７℃以下である。熱履歴品におけるＭＸＤ６の融点が２３３℃未満になると、易裂性延伸フィルムの直線カット性と衝撃強度が低下する。また、熱履歴品におけるＭＸＤ６の融点が２３８℃を超えると、層内剥離を防止する効果が低くなる。
　なお、熱履歴品が製造される過程で、混練時の温度や圧力が高いと熱履歴品中のＭＸＤ６の融点はより大きく下がる。
　ここで、熱履歴品におけるＭＸＤ６の融点とは、バージン原料と溶融混練される前の状態で測定された融点をいう。
　本実施形態で作製したＯＮｙフィルムをラミネート袋の表基材として利用する場合には、易裂性の観点より、ＭＤ方向およびＴＤ方向のいずれの方向についても引裂強度が７０Ｎ／ｃｍ以下であることが好ましい。 Further, the melting point of MXD6 in the heat history product is 233 ° C. or higher and 238 ° C. or lower, preferably 235 ° C. or higher and 237 ° C. or lower. When the melting point of MXD6 in the heat history product is less than 233 ° C., the linear cut property and impact strength of the easily tearable stretched film are lowered. Moreover, when the melting point of MXD6 in the heat history product exceeds 238 ° C., the effect of preventing in-layer peeling is reduced.
In addition, when the temperature and pressure at the time of kneading are high in the process of manufacturing a heat history product, the melting point of MXD6 in the heat history product is further lowered.
Here, the melting point of MXD6 in the heat history product refers to a melting point measured in a state before being melt-kneaded with the virgin raw material.
When the ONy film produced in this embodiment is used as the front substrate of a laminate bag, the tear strength is 70 N / cm or less in both the MD direction and the TD direction from the viewpoint of easy tearability. Is preferred.
　本実施形態で作製したＯＮｙフィルムでは、熱履歴品におけるＮｙ６とＭＸＤ６の配合割合が、Ｎｙ６：ＭＸＤ６＝６０質量％から８５質量％まで：１５質量％から４０質量％まで（両者の合計は１００質量％）であることが好ましい。熱履歴品におけるＮｙ６とＭＸＤ６の配合割合が、この範囲内であると、直線カット性、衝撃強度および層内剥離防止効果により優れる。 In the ONy film produced in this embodiment, the blending ratio of Ny6 and MXD6 in the heat history product is Ny6: MXD6 = 60 mass% to 85 mass%: 15 mass% to 40 mass% (the total of both is 100 mass) %). When the blending ratio of Ny6 and MXD6 in the heat history product is within this range, the linear cut property, impact strength, and the effect of preventing delamination in the layer are excellent.
　［本実施形態の効果］
　前記したような実施形態によれば、次のような効果を奏することができる。
（１）熱処理時にフィルム２に収縮力が発生しても、把持部材７２には、フィルム２の流れ方向における上流側の端部にＲ形状が設けられているために、フィルム２にノッチが入るのを防止できる。そのため、フィルム２に熱処理を施す際のフィルム切れを防止でき、フィルム２の連続生産性を向上できる。
（２）把持部材７２には、フィルム２の流れ方向における下流側の端部にＲ形状が設けられているために、フィルム２にノッチが入るのをより確実に防止できる。
（３）第一熱処理装置２０に、フィルム２に熱処理を施す際のフィルム切れを防止でき、フィルム２の連続生産性を向上できる把持具７０を用いているために、前記易裂性二軸延伸ナイロンフィルムのように易裂性フィルムであっても効率よく熱処理を施すことができる。 [Effect of this embodiment]
According to the embodiment as described above, the following effects can be obtained.
(1) Even if a contraction force is generated in the film 2 during the heat treatment, the gripping member 72 has a notch in the film 2 because the grip member 72 has an R shape at the upstream end in the flow direction of the film 2. Can be prevented. Therefore, the film 2 can be prevented from being cut when the film 2 is heat-treated, and the continuous productivity of the film 2 can be improved.
(2) Since the grip member 72 is provided with an R shape at the downstream end in the flow direction of the film 2, it is possible to more reliably prevent the film 2 from being notched.
(3) Since the first heat treatment apparatus 20 uses the gripping tool 70 that can prevent film breakage when heat-treating the film 2 and can improve the continuous productivity of the film 2, the easily tearable biaxial stretching. Even if it is an easily tearable film like a nylon film, it can heat-process efficiently.
　［実施形態の変形］
　なお、以上説明した態様は、本発明の一態様を示したものであって、本発明は、前記した実施形態に限定されるものではなく、本発明の構成を備え、目的および効果を達成できる範囲内での変形や改良が、本発明の内容に含まれるものであることはいうまでもない。また、本発明を実施する際における具体的な構造および形状などは、本発明の目的および効果を達成できる範囲内において、他の構造や形状などとしても問題はない。本発明は前記した各実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形や改良は、本発明に含まれるものである。 [Modification of Embodiment]
The aspect described above shows one aspect of the present invention, and the present invention is not limited to the above-described embodiment, and has the configuration of the present invention and can achieve the object and effect. It goes without saying that modifications and improvements within the scope are included in the content of the present invention. In addition, the specific structure and shape in carrying out the present invention may be used as other structures and shapes within the scope of achieving the object and effect of the present invention. The present invention is not limited to the above-described embodiments, and modifications and improvements within the scope that can achieve the object of the present invention are included in the present invention.
　例えば、本実施形態では、把持部材７２には、フィルム２の流れ方向における上流側および下流側の両端部にＲ形状が設けたが、これに限定されない。把持部材７２には、フィルム２の流れ方向における上流側の端部にのみＲ形状が設けられているものであってもよい。また、本実施形態では、二軸延伸ナイロンフィルムを製造したが、一軸延伸ナイロンフィルムを製造してもよい。さらに、フィルムの材質は、ナイロン以外のものであってもよい。また、本実施形態では、二軸延伸方法としてチューブラー方式を採用したが、テンター方式であってもよい。さらに、延伸方法としては同時二軸延伸でも逐次二軸延伸でもよい。 For example, in the present embodiment, the gripping member 72 is provided with R shapes at both ends on the upstream side and the downstream side in the flow direction of the film 2, but the present invention is not limited to this. The gripping member 72 may be provided with an R shape only at the upstream end in the flow direction of the film 2. Moreover, in this embodiment, although the biaxially stretched nylon film was manufactured, you may manufacture a uniaxially stretched nylon film. Further, the material of the film may be other than nylon. Moreover, in this embodiment, although the tubular system was employ | adopted as a biaxial stretching method, a tenter system may be used. Furthermore, the stretching method may be simultaneous biaxial stretching or sequential biaxial stretching.
　次に、本発明を実施例および比較例によりさらに詳細に説明するが、本発明はこれらの例によってなんら限定されるものではない。なお、各例における特性（ライン安定性、フィルム融着および直線カット性）は以下のような方法で評価した。
（i）ライン安定性
　第一熱処理工程におけるフィルム切れの有無を観察し、ライン安定性を下記の基準に従って評価した。
Ａ：第一熱処理工程におけるフィルム切れが、２４時間以上１回もない。
Ｂ：第一熱処理工程におけるフィルム切れが、１２時間以上２４時間以下の間に１回以上２回以下である。
Ｃ：第一熱処理工程におけるフィルム切れが、１２時間以内に３回以上である。
（ii）融着
　第二熱処理工程におけるフィルムの融着を下記の基準に従って評価した。
Ａ：フィルムの融着が発生しない。
Ｃ：フィルムの融着が発生する。
（iii）直線カット性
　フィルムを引き裂いた際の直線カット性を下記の基準に従って評価した。
Ａ：フィルムを直線的に引き裂くことができる。
Ｂ：フィルムをほぼ直線的に引き裂くことができる。
Ｃ：フィルムを直線的に引き裂くことができない。 EXAMPLES Next, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited at all by these examples. In addition, the characteristics (line stability, film fusion, and linear cut property) in each example were evaluated by the following methods.
(I) Line stability The presence or absence of film breakage in the first heat treatment step was observed, and the line stability was evaluated according to the following criteria.
A: There is no film breakage in the first heat treatment step for 24 hours or more.
B: Film breakage in the first heat treatment step is 1 to 2 times within 12 hours to 24 hours.
C: Film breakage in the first heat treatment step is 3 times or more within 12 hours.
(Ii) Fusion The film fusion in the second heat treatment step was evaluated according to the following criteria.
A: Film fusion does not occur.
C: Film fusion occurs.
(Iii) Straight line cut property The straight line cut property when the film was torn was evaluated according to the following criteria.
A: The film can be torn linearly.
B: The film can be torn almost linearly.
C: The film cannot be torn linearly.
［実施例１］
（原反フィルム製造工程）
　Ｎｙ６ペレット７０質量％と、ＭＸＤ６ペレット３０質量％を混合してなるバージン原料に対して、すでに一度、この配合比で溶融混合してペレット化した熱履歴品（ＭＸＤ６の融点が２３６℃のもの）を原料全量基準（バージン原料と熱履歴品の合計量基準）で３０質量％配合した。後述する他の実施例・比較例においても、Ｎｙ６とＭＸＤ６の配合比は、バージン原料と熱履歴品ともに同じである。結局、本実施例におけるＮｙ６全体とＭＸＤ６全体の質量比は、Ｎｙ６／ＭＸＤ６＝７０／３０である。
　そして、図１に示すように、このドライブレンド品を押出機９１中、２７０℃で溶融混練した後、溶融物をサーキュラーダイス９２からチューブ状のフィルムとして押出し、引き続き水（１５℃）で急冷して原反フィルム１を作製した。なお、ＭＸＤ６の融点は、パーキンエルマー社製示差走査熱量測定装置（ＤＳＣ）を用い、昇温速度１０℃／ｍｉｎで５０℃から２８０℃まで昇温を行って測定した。いずれもファーストランにおけるピーク値を融点とした。なお、熱履歴品は、２７０℃で１０分間熱処理を行ったものである。
　Ｎｙ６として使用したものは、宇部興産（株）製ナイロン６〔ＵＢＥナイロン　１０２３ＦＤ（商品名）、相対粘度　ηr＝３．６〕であり、ＭＸＤ６として使用したものは、三菱ガス化学（株）製メタキシリレンジアジパミド「ＭＸナイロン　６００７（商品名）、相対粘度　ηｒ＝２．７」である。
（二軸延伸工程）
　次に、図１に示すように、この原反フィルム１を一対のピンチロール１１間に挿通した後、中に気体を圧入しながら加熱部１２（設定温度：３１０℃）で加熱すると共に、延伸開始点に１５ｍ３／分の風量で吹き付けてバブルに膨張させ、下流側の一対のピンチロール１４で引き取ることにより、チューブラー法によるＭＤ方向およびＴＤ方向の同時二軸延伸を行った。この延伸の際の倍率はＭＤ方向で３．０倍、ＴＤ方向で３．２倍とした。（第一熱処理工程および第二熱処理工程）
　次に、図１に示すように、フィルム２に対し第一熱処理装置２０により温度１７０℃にて熱処理を施し、その後、分離装置３０を経た後に、第二熱処理装置４０により温度２１０℃にて熱処理を施した。なお、第一熱処理装置２０の把持具７０における把持部材７２としては、把持部材７２の端部のＲ形状における曲率半径が５ｍｍＲのものを用いた。また、第二熱処理装置４０の把持具７０における把持部材７２としては、把持部材７２の端部のＲ形状における曲率半径が１ｍｍＲのものを用いた。
（巻取工程）
　次いで、図１に示すように、第二熱処理工程により熱固定されたフィルム３を、張力制御装置５０を経て、ガイドロール６１を介して２本の巻取ロール６２に、フィルム３Ａ，３Ｂとして巻き取って二軸延伸ナイロンフィルムを製造した。
　得られた二軸延伸ナイロンフィルムの直線カット性を評価した。得られた結果を表１に示す。また、製造過程におけるライン安定性およびフィルム融着を評価した。得られた結果を表１に示す。 [Example 1]
(Raw film production process)
A heat history product that has already been melt-mixed and pelletized at this blending ratio to a virgin raw material obtained by mixing 70% by mass of Ny6 pellets and 30% by mass of MXD6 pellets (with a melting point of MXD6 of 236 ° C) 30% by mass based on the total amount of raw materials (based on the total amount of virgin raw materials and heat history products). In other examples and comparative examples described later, the blending ratio of Ny6 and MXD6 is the same for both the virgin raw material and the heat history product. After all, the mass ratio of the whole Ny6 and the whole MXD6 in this embodiment is Ny6 / MXD6 = 70/30.
Then, as shown in FIG. 1, after this dry blend product is melt-kneaded in an extruder 91 at 270 ° C., the melt is extruded as a tube-like film from a circular die 92 and then rapidly cooled with water (15 ° C.). Thus, a raw film 1 was produced. The melting point of MXD6 was measured by increasing the temperature from 50 ° C. to 280 ° C. at a temperature increase rate of 10 ° C./min using a differential scanning calorimeter (DSC) manufactured by PerkinElmer. In any case, the peak value in the first run was taken as the melting point. The heat history product was heat-treated at 270 ° C. for 10 minutes.
Ny6 used was nylon 6 [UBE nylon 1023FD (trade name), relative viscosity ηr = 3.6] manufactured by Ube Industries, Ltd., and MXD6 used was manufactured by Mitsubishi Gas Chemical Company Xylylene adipamide “MX nylon 6007 (trade name), relative viscosity ηr = 2.7”.
(Biaxial stretching process)
Next, as shown in FIG. 1, the raw film 1 is inserted between a pair of pinch rolls 11, and then heated by a heating unit 12 (set temperature: 310 ° C.) while being pressed into a gas, and stretched. The starting point was blown with a flow rate of 15 m 3 / min to expand into a bubble, and taken up by a pair of downstream pinch rolls 14 to perform simultaneous biaxial stretching in the MD direction and the TD direction by the tubular method. The magnification during this stretching was 3.0 times in the MD direction and 3.2 times in the TD direction. (First heat treatment step and second heat treatment step)
Next, as shown in FIG. 1, the film 2 is subjected to heat treatment at a temperature of 170 ° C. by the first heat treatment apparatus 20, and then passed through the separation apparatus 30 and then heat treated at a temperature of 210 ° C. by the second heat treatment apparatus 40. Was given. In addition, as the gripping member 72 in the gripping tool 70 of the first heat treatment apparatus 20, a member having an R-shaped curvature radius of 5 mmR at the end of the gripping member 72 was used. In addition, as the gripping member 72 in the gripping tool 70 of the second heat treatment apparatus 40, one having a radius of curvature of 1 mmR in the R shape at the end of the gripping member 72 was used.
(Winding process)
Next, as shown in FIG. 1, the film 3 heat-set in the second heat treatment step is wound as two films 3 </ b> A and 3 </ b> B on two winding rolls 62 via a guide roll 61 via a tension control device 50. A biaxially stretched nylon film was produced.
The straight cut property of the obtained biaxially stretched nylon film was evaluated. The obtained results are shown in Table 1. In addition, line stability and film fusion in the manufacturing process were evaluated. The obtained results are shown in Table 1.
［実施例２～１１、比較例１］
　表１に示す原料組成および製造条件に従って各条件を変更した以外は実施例１と同様にして、二軸延伸ナイロンフィルムを製造した。
　得られた二軸延伸ナイロンフィルムの直線カット性をそれぞれ評価した。得られた結果を表１に示す。また、製造過程におけるライン安定性およびフィルム融着を評価した。得られた結果を表１に示す。 [Examples 2 to 11, Comparative Example 1]
A biaxially stretched nylon film was produced in the same manner as in Example 1 except that each condition was changed according to the raw material composition and production conditions shown in Table 1.
The linear cut properties of the obtained biaxially stretched nylon films were evaluated. The obtained results are shown in Table 1. In addition, line stability and film fusion in the manufacturing process were evaluated. The obtained results are shown in Table 1.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　表１に示す結果からも明らかなように、第一熱処理装置２０の把持具７０における把持部材７２に、曲率半径が３ｍｍＲ以上１５ｍｍＲ以下のＲ形状が設けられている場合（実施例１～６、１０および１１）には、フィルムに熱処理を施す際のフィルム切れを防止でき、フィルムの連続生産性を向上できることが確認された。なお、第一熱処理装置２０および第二熱処理装置４０の把持具７０における把持部材７２に、曲率半径が３ｍｍＲ以上１５ｍｍＲ以下のＲ形状が設けられている場合（実施例１０および１１）には、フィルムの連続生産性をより向上できる。
　一方、第一熱処理装置２０の把持具７０における把持部材７２にＲ形状が設けられていない場合（比較例１）には、第一熱処理工程において頻繁にフィルム切れが発生した。
　また、第一熱処理装置２０の把持具７０における把持部材７２に、曲率半径が３ｍｍＲ未満のＲ形状が設けられている場合（実施例７～８）には、フィルムに熱処理を施す際のフィルム切れを十分には抑制できなかった。さらに、第一熱処理工程を行わなかった場合（実施例９）には、フィルムの融着が発生する点で好ましくないことが確認された。 As is apparent from the results shown in Table 1, when the gripping member 72 of the gripping tool 70 of the first heat treatment apparatus 20 is provided with an R shape having a radius of curvature of 3 mmR or more and 15 mmR or less (Examples 1 to 6, 10 and 11), it was confirmed that the film can be prevented from being cut when heat-treated, and the continuous productivity of the film can be improved. When the gripping member 72 in the gripping tool 70 of the first heat treatment apparatus 20 and the second heat treatment apparatus 40 is provided with an R shape having a curvature radius of 3 mmR or more and 15 mmR or less (Examples 10 and 11), a film The continuous productivity can be further improved.
On the other hand, when the gripping member 72 in the gripping tool 70 of the first heat treatment apparatus 20 is not provided with an R shape (Comparative Example 1), film breakage frequently occurred in the first heat treatment step.
Further, when the gripping member 72 of the gripping tool 70 of the first heat treatment apparatus 20 is provided with an R shape with a radius of curvature of less than 3 mmR (Examples 7 to 8), the film breakage when the film is heat-treated Could not be sufficiently suppressed. Furthermore, when the first heat treatment step was not performed (Example 9), it was confirmed that it was not preferable in terms of the occurrence of film fusion.
　本発明の把持具および熱処理方法は、フィルム（特に二軸延伸ナイロンフィルム）を製造する技術として有用である。また、本発明により得られるフィルムは、食品包装材料、医薬品包装材料、電子部品包装材料、日用品包装材料として有用である。 The gripping tool and heat treatment method of the present invention are useful as a technique for producing a film (particularly a biaxially stretched nylon film). Moreover, the film obtained by this invention is useful as a food packaging material, a pharmaceutical packaging material, an electronic component packaging material, and a daily necessities packaging material.
　　２…基材フィルム
　　３…二軸延伸ナイロンフィルム
　　２０…第一熱処理装置
　　２１…テンター
　　２２…加熱炉
　　４０…第二熱処理装置
　　４１…テンター
　　４２…加熱炉
　　７０…把持具
　　７１…基体部材
　　７２…把持部材 DESCRIPTION OF SYMBOLS 2 ... Base film 3 ... Biaxially-stretched nylon film 20 ... 1st heat processing apparatus 21 ... Tenter 22 ... Heating furnace 40 ... 2nd heat processing apparatus 41 ... Tenter 42 ... Heating furnace 70 ... Holding tool 71 ... Base member 72 ... Holding member

Claims (9)

  1. 　フィルムに熱処理を施す際に用いる把持具であって、
    　前記把持具は、基体部材と、この基体部材との間で前記フィルムを把持する把持部材とを備え、
    　前記把持部材には、前記フィルムの流れ方向における上流側および下流側のうち少なくとも上流側の端部にＲ形状が設けられている
    　ことを特徴とする把持具。     A gripping tool used when heat-treating a film,
    The gripping tool includes a base member and a gripping member for gripping the film between the base member,
    The gripping device is characterized in that the gripping member is provided with an R-shape at least at the upstream end of the upstream side and the downstream side in the film flow direction.
  2. 　請求項１に記載の把持具において、
    　前記Ｒ形状が、曲率半径が３ｍｍＲ以上１５ｍｍＲ以下のＲ形状が設けられている
    　ことを特徴とする把持具。     The gripping tool according to claim 1, wherein
    The R-shape is provided with an R-shape having a radius of curvature of 3 mmR or more and 15 mmR or less.
  3. 　請求項２に記載の把持具において、
    　前記把持部のＲ形状における曲率半径が、５ｍｍＲ以上である
    　ことを特徴とする把持具。     The gripping tool according to claim 2, wherein
    A gripping tool, wherein a radius of curvature of the grip portion in an R shape is 5 mmR or more.
  4. 　フィルムを把持して熱処理を施すフィルムの熱処理方法であって、
    　請求項１から請求項３のいずれか一項に記載の把持具を用いて、前記フィルムを把持する
    　ことを特徴とする熱処理方法。     A film heat treatment method for gripping a film and performing heat treatment,
    The heat processing method characterized by gripping the film using the gripping tool according to any one of claims 1 to 3.
  5. 　請求項４に記載の熱処理方法において、
    　前記熱処理は、第一熱処理および第二熱処理の２段階で施され、
    　少なくとも前記第一熱処理を施す際には、前記把持具を用いる
    　ことを特徴とする熱処理方法。     The heat treatment method according to claim 4,
    The heat treatment is performed in two stages, a first heat treatment and a second heat treatment,
    The gripping tool is used when performing the first heat treatment at least.
  6. 　請求項５に記載の熱処理方法において、
    　前記フィルムは、二軸延伸後のフィルムである
    　ことを特徴とする熱処理方法。     In the heat processing method of Claim 5,
    The heat treatment method, wherein the film is a film after biaxial stretching.
  7. 　請求項６に記載の熱処理方法において、
    　前記フィルムは、ナイロン６（以後、Ｎｙ６ともいう）とメタキシリレンアジパミド（以後、ＭＸＤ６ともいう）とを原料として含み、
    　前記原料は、Ｎｙ６が４０質量％から８５質量％まで、ＭＸＤ６が１５質量％から６０質量％まで（両者の合計は１００質量％）からなるバージン原料と、
    　Ｎｙ６およびＭＸＤ６を溶融混練してなる熱履歴品とを含み、
    　前記熱履歴品におけるＭＸＤ６の融点は、２３３℃以上２３８℃以下であり、かつ、
    　前記熱履歴品の含有量は、原料全量基準で５質量％以上４０質量％以下である
    　ことを特徴とする熱処理方法。     The heat treatment method according to claim 6,
    The film contains nylon 6 (hereinafter also referred to as Ny6) and metaxylylene adipamide (hereinafter also referred to as MXD6) as raw materials,
    The raw material is a virgin raw material in which Ny6 is 40% by mass to 85% by mass, MXD6 is 15% by mass to 60% by mass (the total of both is 100% by mass),
    Including a heat history product obtained by melt-kneading Ny6 and MXD6,
    The melting point of MXD6 in the heat history product is 233 ° C. or higher and 238 ° C. or lower, and
    Content of the said heat history goods is 5 mass% or more and 40 mass% or less on the raw material whole quantity basis. The heat processing method characterized by the above-mentioned.
  8. 　請求項５から請求項７のいずれか一項に記載の熱処理方法において、
    　前記第一熱処理は、テンター方式にて、前記フィルムの流れ方向に対する幅方向の両端を前記把持具で把持しながら、前記フィルムに熱をかける処理であり、
    　前記第一熱処理における熱処理温度は、１２０℃以上１９０℃以下であり、かつ、
    　前記第一熱処理における弛緩率は、１５％以下である
    　ことを特徴とする熱処理方法。     In the heat treatment method according to any one of claims 5 to 7,
    The first heat treatment is a process of applying heat to the film while gripping both ends in the width direction with respect to the flow direction of the film with the gripping tool in a tenter method.
    The heat treatment temperature in the first heat treatment is 120 ° C. or higher and 190 ° C. or lower, and
    The relaxation rate in the first heat treatment is 15% or less.
  9. 　請求項５から請求項７のいずれか一項に記載の熱処理方法において、
    　前記第二熱処理は、テンター方式にて、前記フィルムの流れ方向に対する幅方向の両端を前記把持具で把持しながら、前記フィルムに熱をかける処理であり、
    　前記第二熱処理における熱処理温度は、１９０℃以上２２０℃以下であり、かつ、
    　前記第二熱処理における弛緩率は、１５％以下である
    　ことを特徴とする熱処理方法。     In the heat treatment method according to any one of claims 5 to 7,
    The second heat treatment is a process of applying heat to the film while gripping both ends in the width direction with respect to the flow direction of the film with the gripping tool in a tenter method.
    The heat treatment temperature in the second heat treatment is 190 ° C. or higher and 220 ° C. or lower, and
    The relaxation rate in the second heat treatment is 15% or less.
PCT/JP2012/080547 2011-12-01 2012-11-27 Gripper and heat treatment method WO2013080940A1 (en)

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WO2021090692A1 (en) * 2019-11-08 2021-05-14 住友化学株式会社 Method for manufacturing dried film roll

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JPS62278018A (en) * 1986-05-28 1987-12-02 Toray Ind Inc Biaxial co-stretching of plastic film
JPH06106619A (en) * 1992-09-24 1994-04-19 Idemitsu Petrochem Co Ltd Manufacture of easily tearable film
JPH11277621A (en) * 1998-03-31 1999-10-12 Toray Ind Inc Biaxially oriented thermoplastic resin film and manufacture thereof
JP2000198140A (en) * 1998-10-29 2000-07-18 Toray Ind Inc Tenter clip and production of thermoplastic resin film
JP2001187421A (en) * 2000-01-05 2001-07-10 Toray Ind Inc Tenter clip and producing method for thermoplastic resin film
JP2001334569A (en) * 2000-05-26 2001-12-04 Toray Ind Inc Method for manufacturing thermoplastic resin film

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JPS62278018A (en) * 1986-05-28 1987-12-02 Toray Ind Inc Biaxial co-stretching of plastic film
JPH06106619A (en) * 1992-09-24 1994-04-19 Idemitsu Petrochem Co Ltd Manufacture of easily tearable film
JPH11277621A (en) * 1998-03-31 1999-10-12 Toray Ind Inc Biaxially oriented thermoplastic resin film and manufacture thereof
JP2000198140A (en) * 1998-10-29 2000-07-18 Toray Ind Inc Tenter clip and production of thermoplastic resin film
JP2001187421A (en) * 2000-01-05 2001-07-10 Toray Ind Inc Tenter clip and producing method for thermoplastic resin film
JP2001334569A (en) * 2000-05-26 2001-12-04 Toray Ind Inc Method for manufacturing thermoplastic resin film

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021090692A1 (en) * 2019-11-08 2021-05-14 住友化学株式会社 Method for manufacturing dried film roll
CN114641443A (en) * 2019-11-08 2022-06-17 住友化学株式会社 Method for producing dried film roll
KR20220097473A (en) 2019-11-08 2022-07-07 스미또모 가가꾸 가부시키가이샤 Method of making dry film rolls

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