WO2013012067A1 - プリフォームの温度調整装置及びプリフォームの温度調整方法、樹脂製容器及び樹脂製容器の製造方法 - Google Patents
プリフォームの温度調整装置及びプリフォームの温度調整方法、樹脂製容器及び樹脂製容器の製造方法 Download PDFInfo
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- WO2013012067A1 WO2013012067A1 PCT/JP2012/068471 JP2012068471W WO2013012067A1 WO 2013012067 A1 WO2013012067 A1 WO 2013012067A1 JP 2012068471 W JP2012068471 W JP 2012068471W WO 2013012067 A1 WO2013012067 A1 WO 2013012067A1
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- WIPO (PCT)
- Prior art keywords
- preform
- temperature
- pot
- temperature adjustment
- core
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 42
- 239000011347 resin Substances 0.000 title description 33
- 229920005989 resin Polymers 0.000 title description 33
- 238000004519 manufacturing process Methods 0.000 title description 14
- 238000001816 cooling Methods 0.000 claims abstract description 71
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 230000002093 peripheral effect Effects 0.000 claims description 86
- 238000001746 injection moulding Methods 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 11
- 230000001965 increasing effect Effects 0.000 claims description 6
- 238000000071 blow moulding Methods 0.000 abstract description 22
- 238000009826 distribution Methods 0.000 description 16
- 239000002537 cosmetic Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 239000011521 glass Substances 0.000 description 7
- 230000003028 elevating effect Effects 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Images
Classifications
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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
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
- B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
- B29B11/08—Injection moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/14—Making preforms characterised by structure or composition
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- 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
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
-
- 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
- B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
-
- 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
- B29C49/78—Measuring, controlling or regulating
- B29C49/786—Temperature
-
- 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
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
- B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
- B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
- B29C2949/0772—Closure retaining means
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
- B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
- B29C2949/078—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the bottom
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/081—Specified dimensions, e.g. values or ranges
- B29C2949/0811—Wall thickness
- B29C2949/0817—Wall thickness of the body
-
- 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/081—Specified dimensions, e.g. values or ranges
- B29C2949/0811—Wall thickness
- B29C2949/0818—Wall thickness of the bottom
-
- 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
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6427—Cooling of preforms
-
- 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
- B29C49/78—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/003—PET, i.e. poylethylene terephthalate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
Definitions
- Resin containers are advantageous in that they are difficult to break, are light and easy to handle, and are inexpensive.
- the blow molding method is a hot parison method that uses the retained heat (internal heat) during injection molding without cooling the preform to room temperature, and the preform is cooled to room temperature and then reheated and blow molded.
- the retained heat internal heat
- General molding of a preform is performed by injecting molten resin into an injection space formed by an injection cavity mold, an injection core mold, and a neck mold.
- the molten resin is rapidly cooled and solidified to about 80 ° C. on the inner and outer surfaces in contact with the cooled injection cavity mold and injection core mold to form a skin layer on the surface.
- the preform can be released from the injection mold while maintaining the shape.
- the inside of the preform is in an incompletely cooled state and is in a high temperature state of about 140 ° C.
- the bottom part is thick and the body part is relatively thin and uniform (having a good thickness distribution as a small and medium-sized container in which cosmetics and the like are stored).
- the method of forming these containers has not yet been established.
- the bottom portion of the bottomed preform is disposed at the standby position above the temperature adjustment pot, and the bottom portion of the bottomed preform is moved up by the pressing drive means.
- the wall surface is held in close contact.
- the bottom part of the bottomed preform is in close contact with the inner wall surface of the temperature adjustment pot without any gap, and the temperature adjustment is accurately performed from the outside of the bottomed preform.
- the temperature state and bottom shape (thickness) of the bottomed preform can be reliably controlled to a desired state, and a bottomed preform for obtaining a container with improved appearance can be obtained. become.
- the preform temperature adjusting device is a cooling pot
- the temperature adjusting core is a cooling member
- the temperature adjustment block is a heating block.
- the bottom portion of the bottomed preform and a part of the peripheral portion continuous to the bottom portion can be reliably cooled, and the peripheral portion can be heated to a desired temperature state. it can.
- the preform temperature adjusting device according to the third aspect, wherein the bottomed preform is formed with respect to a peripheral portion continuous with the bottom portion.
- a thickened material is disposed between the temperature adjustment pot and the temperature adjustment core.
- a preform temperature control method comprising: a bottom portion and a peripheral portion continuous to the bottom portion by injection molding; and a thickness of the bottom portion relative to the peripheral portion.
- the bottom portion and a part of the peripheral portion continuous to the bottom portion are sandwiched between the cooling pot and the cooling core, and cooling is efficiently performed from both sides. Further, it becomes possible to more efficiently manufacture a resin container in which a thick bottom portion and a thin and uniform peripheral portion are adjacent to each other.
- the resin container and the resin container manufacturing method of the present invention can be obtained by using a preform for improving the appearance.
- a resin container in which a thick bottom portion and a thin and uniform body portion are adjacent to each other.
- FIG. 1 is a cross-sectional view showing the appearance of an injection-molded preform
- FIG. 2 is a cross-sectional view of a temperature adjusting device according to an embodiment of the present invention
- FIG. 3 is a temperature adjusting pot provided with a cooling pot and a heating block. Appearance
- FIG. 4 shows the appearance of the temperature adjustment core.
- the preform temperature adjusting device of the present invention is a device that adjusts the temperature and thickness of the bottomed preform made of injection-molded resin to a desired state. Then, a preform adjusted to a desired temperature and thickness is blow-molded into a container. When blow molding is performed, the distribution of the uneven thickness of the surrounding part (body part) is eliminated, the bottom part is locally thickened, and a container in which the degree of transparency and gloss are kept uniform is obtained. As described above, the temperature and thickness of the preform are adjusted by the temperature adjusting device of the present invention.
- the manufactured container is used, for example, as a container for cosmetics and the like whose appearance is important so as to have an aesthetic appearance that matches the container image of the consumer.
- An apparatus for producing a container from a preform includes an injection molding apparatus for injection molding a bottomed preform, a temperature adjustment apparatus for adjusting the temperature and thickness of the injection molded bottomed preform to a desired state, and temperature adjustment. And a blow molding device which blow-molds the bottomed preform into a hollow container.
- the bottomed preform is sequentially transferred to an injection molding device, a temperature adjustment device, and a blow molding device, for example, by a neck type of a rotating disk that is rotatably held on the blow molding device.
- a bottomed preform (preform) 1 as shown in FIG. 1 is injection molded.
- the preform 1 has an oral head 2 in which a thread groove is formed, a body portion 3 disposed below the oral head 2, and a bottom portion 4 that becomes a bottom surface portion of a hollow container after blow molding. That is, the preform 1 is in a state in which the body portion 3 as a peripheral portion is arranged continuously from the bottom portion 4.
- the thickness t ⁇ b> 2 of the bottom portion 4 is greater than or equal to the thickness t ⁇ b> 1 of the trunk portion 3 with respect to the thickness t ⁇ b> 1 of the trunk portion 3.
- the cooling pot 16 includes a bottom 4 of the preform 1 and an inner wall 16a that holds an outer peripheral surface portion of a lower portion (a part of the peripheral portion) 3a of the body 3 continuous to the bottom 4.
- the heating block 17 includes an inner wall surface 17a that faces the outer peripheral surface of the preform 1 except the lower portion 3a of the body portion 3 in a non-contact manner.
- each heating block can be independently temperature controlled, and can be appropriately set within a temperature range of 100 to 450 ° C., for example.
- the cooling pot 16 can be adjusted in temperature within a range of 10 to 90 ° C., for example.
- the pot base 15 is provided with an elevating device 19 as a pressing drive means, and the temperature adjusting pots 12 are moved up and down by the elevating device 19 via the pot base 15.
- the core 22 is substantially brought into contact with a portion (a portion corresponding to a corner) where the stretch ratio of the preform 1 is high (including a state where the core 22 is close enough to be considered to be in contact), and the temperature of that portion is decreased.
- angular part can be suppressed. This is because stretching starts from a non-contact portion having a higher retained heat and is less likely to be stretched at a contact portion where the retained heat has decreased.
- a rectangular container having a sufficient thickness at the corner is manufactured by using the square core 22 and substantially contacting the portion that becomes the container corner of the preform 1. Is possible.
- a circuit for flowing a temperature adjusting medium such as water or oil (not shown) is provided, and the temperature can be set in a range of 10 ° C. to 90 ° C., for example.
- the core base 21 is provided with an elevating device as a pressing drive means (not shown), and the temperature adjusting cores 13 are moved up and down via the core base 21 by the elevating device.
- the outer peripheral surface of the bottom portion 4 and the lower portion 3 a of the trunk portion 3 continuous with the bottom portion 4 can be held by the inner wall surface 16 a of the cooling pot 16 ( Standby).
- the temperature adjusting core 13 is inserted into the preform 1, and the cooling core portion 23 can hold the bottom portion 4 and the inner peripheral surface of the lower portion 3 a of the trunk portion 3 continuous to the bottom portion 4.
- the temperature adjustment pot 12 and the temperature adjustment core 13 are brought relatively close to each other by the lifting device 19 of the pot base 15 and the lifting device of the core base 21 (or by one of the lifting devices), so that the temperature adjustment pot 12 and the temperature adjustment core 13
- the bottom portion 4 of the preform 1 disposed between the bottom portion 3 and the lower portion 3a of the body portion 3 continuing to the bottom portion 4 is formed on the inner wall surface of the temperature adjustment pot 12 (or the inner wall surface of the temperature adjustment pot 12 and the tip portion of the temperature adjustment core 13). Both) are held in close contact with each other.
- the contact portion of the inner peripheral surface of the preform 1 is cooled, and at the same time, the outer peripheral surface of the preform 1 is not in contact. Will be heated. Further, the bottom portion 4 of the preform 1 and the lower portion 3a of the body portion 3 continuous with the bottom portion 4 are mechanically pressed between the inner wall surface 16a of the cooling pot 16 and the cooling core portion 23, and the bottom portion of the final container is further improved. It is also possible to compress and deform to a shape close to. In this case, a part of the material on the bottom 4 side flows to the body 3 side.
- FIG. 5A shows a cross section of the preform 1 supplied to the temperature adjustment pot 12 (standby state), and FIG. 5B shows the bottom wall surface of the preform 1 in close contact with the cooling pot 16 for cooling.
- FIG. 5C shows a cross section in a state where the bottom portion 4 of the preform 1 is pressed and sandwiched between the cooling pot 16 of the temperature adjustment pot 12 and the cooling core portion 23 of the temperature adjustment core 13. It is shown.
- FIG. 6A shows a cross section of the preform 1 whose temperature has been adjusted to a desired state
- FIG. 6B shows a cross section of the container after blow molding. Further, FIG. 7 shows the appearance of the container.
- the cooling pot 16 of the temperature adjustment pot 12 is adjusted to a temperature required for predetermined cooling, and the heating block 17 is adjusted to a temperature required for predetermined heating. Further, the cooling core portion 23 of the temperature adjusting core 13 is adjusted to a temperature required for predetermined cooling.
- the temperature adjusting pots 12 are positioned (standby) at predetermined positions by the lifting device 19 via the pot base 15.
- the temperature adjustment pot 12 has a desired height ( ⁇ 1) so that the bottom portion 4 of the preform 1 and the lower portion 3a of the body portion 3 continuous with the bottom portion 4 can come into close contact with the inner wall surface 16a of the cooling pot 16. It raises only (FIG.5 (b)).
- the bottom 4 of the preform 1 and a part of the peripheral portion 3 continuous to the bottom 4 are expanded in diameter following the shape of the inner wall surface 16a of the cooling pot 16, so the length is slightly shortened.
- the thickness is also slightly thinner than (a).
- the inner wall surface 17a of the heating block 17 is opposed to the outer peripheral surface of the part excluding the lower part 3a of the body part 3 of the preform 1 in a non-contact manner.
- the bottom 4 and a part of the peripheral portion 3 continuous to the bottom 4 are cooled as a whole, resulting in a temperature lower than that of the barrel 3.
- resin meat remains on the bottom of the container after blowing. It becomes easy.
- the core 22 into the preform 1 by lowering the temperature adjusting core 13 via the pressing drive means of the core base 21.
- the lower limit position of the cooling core portion 23 which becomes the tip of the temperature adjusting core 13 can lightly contact the bottom portion 4 of the preform 1 and the inner peripheral surface portion of the lower portion 3a of the trunk portion 3 continuous to the bottom portion 4.
- the shape of the bottom 4 of the preform 1 and the shape of a part of the peripheral portion 3 continuing to the bottom 4 are not substantially changed from the point (b).
- the tip shape of the cooling core portion 23 is preferably flat rather than sharp. This is because the contact area with the inner surface of the bottom 4 of the preform 1 is increased, and the cooling efficiency is improved.
- the bottom part 4 of the preform 1 and the lower part 3 a of the body part 3 continuous to the bottom part 4 are mechanically compressed and sandwiched between the temperature adjustment pot 12 and the temperature adjustment core 13.
- the bottom part 4 of the preform 1 and the part 3b of the body part 3 other than the lower part 3a of the body part 3 continuous with the bottom part 4 are the inner wall surface 17a of the heating block 17 and the core 22 at a part other than the cooling core part 23. Heated in a non-contact manner. This condition avoids a shortage of internal heat required for blow molding within the range of the peripheral part and bottom part to be blow molded.
- the bottom part 4 of the preform 1 is cooled, the lower part 3a of the trunk part 3 continuing to the bottom part 4 is cooled, and the part 3b of the trunk part 3 other than the lower part 3a of the trunk part 3 is in a state that can be stretched. It is heated to adjust the temperature and shape of the preform 1 (a shape similar to the bottom shape of the final container) to a desired state.
- cooling is performed in a state in which the thickness in the vicinity of the lower portion 3a of the trunk portion 3 continuous with the bottom portion 4 and the bottom portion 4 of the preform 1 is ensured, and the shape is ensured by blow molding in a subsequent process
- Heating can be performed in a state where the thickness of the portion 3b of the body portion 3 of the preform 1 can be made relatively thin and can be uniformly stretched by blow molding in a subsequent process.
- the temperature distribution given to the preform 1 by the temperature adjusting device 11 and the temperature adjusting method described above depends on the shape and weight of the preform 1, the state of the temperature distribution from the time of injection molding, and the final container. It is changed depending on the shape and required standard value.
- the temperature adjustment pot 12 is raised first, but the temperature adjustment pot 12 and the temperature adjustment core 13 are not limited to this. Specifically, the length of the temperature adjustment processing time, which one of the temperature adjustment core 13 and the temperature adjustment pot 12 is separated from the preform 1 first (which of the cooling process and the heating process is made longer) depends on the preform. In order to give an appropriate temperature distribution to 1, it may be appropriately changed.
- the preform 1 adjusted to a predetermined shape (thickness) and temperature by the temperature adjusting device 11 is biaxially stretched by blow molding, and is cooled to a desired state as shown in FIG. 6B. 4 and the lower part 3a of the body part 3 continuous to the bottom part 4 are maintained, and the part 3b of the body part 3 of the preform 1 heated to ensure the stretchability is stretched uniformly and relatively thinly.
- the container is molded into a container (resin container) in which the distribution of the uneven thickness of the bottom part and the body part is eliminated and the degree of transparency and the degree of gloss are maintained in a uniform state.
- examples of resins that can be used in the present apparatus and method include polyethylene terephthalate (PET) and polypropylene (PP).
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Geometry (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
また、本発明は、樹脂製容器及び樹脂製容器の製造方法に関する。
2 口頭部
3 周囲部(胴部) 4 底部
6 回転盤
7 ネック型
11 温度調整装置
12 温度調整ポット
13 温度調整コア
15 ポットベース
16 冷却ポット
17 加熱ブロック
18 連結台
19 押付け駆動手段(昇降装置)
21 押付け駆動手段(コアベース)
22 コア
23 先端部(冷却コア部)
25 容器(最終容器)
26 底部
27 周囲部(胴部)
Claims (7)
- 有底プリフォームの底部及び前記底部に連続する周囲部の一部の外周面に接触する温度調整ポットと、
前記有底プリフォームの前記周囲部の外側に配される温度調整ブロックと、
前記温度調整ポットにより前記有底プリフォームの底部壁面を密着させて保持させる押付け駆動手段とを備えた
ことを特徴とするプリフォームの温度調整装置。 - 有底プリフォームの底部及び前記底部に連続する周囲部の一部の外周面を保持する温度調整ポットと、
前記有底プリフォームの前記周囲部の外側に配される温度調整ブロックと、
前記有底プリフォームの内側に挿入され、先端部で前記底部及び前記底部に連続する前記周囲部の一部の内周面に接触する温度調整コアと、
前記温度調整ポットと前記温度調整コアの間に前記有底プリフォームの底部壁面を保持し、前記温度調整ポットと前記温度調整コアを相対的に接近させ前記底部および前記周囲部の一部を密着させて挟持する押付け駆動手段とを備えた
ことを特徴とするプリフォームの温度調整装置。 - 請求項2に記載のプリフォームの温度調整装置において、
前記温度調整ポットは冷却用のポットであり、
前記温度調整コアは冷却用のコアであり、
前記温度調整ブロックは加熱用のブロックである
ことを特徴とするプリフォームの温度調整装置。 - 請求項3に記載のプリフォームの温度調整装置において、
前記有底プリフォームは、前記底部に連続する周囲部に対し前記底部の肉厚が厚くされたものが前記温度調整ポットと前記温度調整コアの間に配される
ことを特徴とするプリフォームの温度調整装置。 - 射出成形により、底部及び前記底部に連続する周囲部を有し前記周囲部に対して前記底部の肉厚が厚くされた有底プリフォームを成形し、
前記有底プリフォームの前記底部及び前記底部に連続する周囲部の一部の外周面を温度調整ポットにより密着保持して温度調整し、
前記有底プリフォームの前記底部に連続する周囲部の一部を除く前記周囲部の部位を所定の温度に相対的に昇温させる
ことを特徴とするプリフォームの温度調整方法。 - 請求項5に記載のプリフォームの温度調整方法において、
前記底部及び前記底部に連続する周囲部の一部が冷却用のポットと冷却用のコアの間に配され、冷却用のポットと冷却用のコアを互いに接近させることにより、前記底部及び前記底部に連続する周囲部の一部の外周面が冷却用のポットに密着すると共に内周面が冷却用のコアに密着して冷却される
ことを特徴とするプリフォームの温度調整方法。 - 請求項6に記載のプリフォームの温度調整方法において、
前記底部及び前記底部に連続する周囲部の一部を除く前記有底プリフォームの周囲部は完全な非接触状態もしくは周囲部の内周面において一部接触状態で所定の温度に相対的に昇温される
ことを特徴とするプリフォームの温度調整方法。
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US10144168B2 (en) | 2018-12-04 |
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