WO2020262644A1 - Procédé de fabrication d'une préforme, récipient à double paroi et procédé de fabrication d'un récipient à double paroi - Google Patents

Procédé de fabrication d'une préforme, récipient à double paroi et procédé de fabrication d'un récipient à double paroi Download PDF

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Publication number
WO2020262644A1
WO2020262644A1 PCT/JP2020/025330 JP2020025330W WO2020262644A1 WO 2020262644 A1 WO2020262644 A1 WO 2020262644A1 JP 2020025330 W JP2020025330 W JP 2020025330W WO 2020262644 A1 WO2020262644 A1 WO 2020262644A1
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WIPO (PCT)
Prior art keywords
wall
double
walled container
preform
molded body
Prior art date
Application number
PCT/JP2020/025330
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English (en)
Japanese (ja)
Inventor
土屋　要一
遼 河村
Original Assignee
日精エー・エス・ビー機械株式会社
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Filing date
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Application filed by 日精エー・エス・ビー機械株式会社 filed Critical 日精エー・エス・ビー機械株式会社
Priority to JP2021527792A priority Critical patent/JPWO2020262644A1/ja
Publication of WO2020262644A1 publication Critical patent/WO2020262644A1/fr

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Classifications

    • 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
    • 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
    • B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/40—Details of walls
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Definitions

  • the present invention relates to a method for producing a preform, a method for producing a double-walled container, and a method for producing a double-walled container.
  • Patent Document 1 discloses a two-layer plastic bottle in which the inner layer is made of new plastic and the outer layer is made of recycled plastic.
  • Patent Document 2 describes an outer layer molding step of molding a tubular outer layer material with a recycled resin, and an inner layer for laminating and molding an inner layer material composed of a tubular virgin resin thinner than the outer layer material on the inner surface side of the outer layer material.
  • a molding process and a method for producing a laminated resin molded product having the molding process are disclosed.
  • the body has a double inner and outer wall structure, and an appropriate space is formed between the inner and outer walls to obtain a heat insulating effect.
  • recycled materials should be actively used in the containers, no ones that have been developed so that recycled materials can be used while being excellent in hygiene during use.
  • the present invention provides a method for producing a preform that can form a double-walled container that is excellent in hygiene during use even if the ratio of recycled materials used is large, and a method for producing the double-walled container and the double-walled container. With the goal.
  • the body portion is a first partial scheduled portion on the neck portion side, a second partially scheduled portion on the bottom side, and a third portion between the first partially scheduled portion and the second partially scheduled portion.
  • the thickness of the second planned portion, the third planned portion, and the bottom portion of the body portion is thinner than the thickness of the first partially scheduled portion.
  • the secondary molded body injection-molded in the second step is formed on the outside of the second partially scheduled portion, the third partially scheduled portion, and the bottom portion of the body portion of the primary molded body.
  • a resin double-walled container having an outer wall, an inner wall connected to the outer wall, an inner bottom connected to the inner wall, and an opening provided on the side opposite to the inner bottom across the inner wall.
  • the opening-side portion of the outer wall, the inner wall and the inner bottom have a two-layer structure composed of an inner layer made of recycled material and an outer layer made of virgin material.
  • the portion of the outer wall other than the portion on the opening side is made of recycled material.
  • the inner wall and the outer layer of the inner bottom are double-walled containers configured so that the contents contained in the double-walled container come into contact with each other.
  • a blow for forming an intermediate molded product by stretching and blowing a resin preform having an opening, a neck portion connected to the opening, a body portion connected to the neck portion, and a bottom portion connected to the body portion.
  • a method for manufacturing a double-walled container which comprises a pressing step of molding a double-walled container.
  • the intermediate molded product has an inner wall corresponding portion corresponding to the inner wall, an outer wall corresponding portion corresponding to the outer wall, and an inner bottom corresponding portion corresponding to the inner bottom.
  • the inner wall corresponding portion and the inner bottom corresponding portion are formed so as to bulge from the outer wall corresponding portion.
  • the double-walled container is pressed by pressing the inner bottom corresponding portion so that the inner wall corresponding portion formed so as to bulge from the outer wall corresponding portion is inverted to the inside of the outer wall corresponding portion.
  • the body of the preform comprises a first portion on the neck side, a second portion on the bottom side and a third portion between the first portion and the second portion.
  • the neck portion and the first portion of the body portion are made of recycled material.
  • a double-walled container having a two-layer structure in which the second portion, the third portion, and the bottom portion of the body portion are composed of an inner layer made of a recycled material and an outer layer made of a virgin material. It is a manufacturing method.
  • a method for producing a preform capable of forming a double-walled container excellent in hygiene during use even if the ratio of recycled materials used is large and a method for producing the double-walled container and the double-walled container. can do.
  • FIG. 1 is a cross-sectional view of the preform 10.
  • the preform 10 is a resin molded product including an opening 12, a neck portion 14 connected to the opening portion 12, a body portion 16 connected to the neck portion 14, and a bottom portion 18 connected to the body portion 16.
  • the body portion 16 of the preform 10 is tapered from the neck portion 14 side to the bottom portion 18 side.
  • the body 16 includes a first portion 16a on the neck 14 side, a second portion 16b on the bottom 18 side, and a third portion 16c between the first portion 16a and the second portion 16b. ..
  • the neck portion 14 and the first portion 16a of the body portion 16 are made of a recycled material prepared by reusing a used resin material.
  • the second portion 16b, the third portion 16c, and the bottom portion 18 of the body portion 16 are composed of an inner layer 22 made of the above-mentioned recycled material and an outer layer 24 made of a virgin material which is an unused resin material. It has a two-layer structure.
  • the first portion 16a and the inner layer 22 in the two-layer structure are continuous and are made of the same material.
  • the virgin material and recycled material are based on a synthetic resin such as polypropylene (PP) or polyethylene terephthalate (PET).
  • PP polypropylene
  • PET polyethylene terephthalate
  • the weight ratio of the recycled material contained in the preform 10 to the virgin material contained in the preform 10 is 2 or more.
  • the weight ratio of the outer layer 24 to the weight of the outer layer 24 at the 16b, the third portion 16c, and the bottom 18 is 2 or more.
  • the second portion 16b and the third portion 16c of the body portion 16 have a length in the direction extending from the neck portion 14 to the bottom portion 18 of the first portion 16a of the body portion 16.
  • the ratio to the total length in the direction extending from the neck portion 14 to the bottom portion 18 is preferably 0.1 or more and less than 1. Further, the ratio is more preferably 0.3 or more, and particularly preferably 0.5 or more. Further, the ratio is more preferably 0.9 or less, and particularly preferably 0.8 or less. Within the numerical range, the ratio of recycled materials used can be further improved, and the double-walled container 30 which is more excellent in terms of hygiene during use can be formed. Further, the thicknesses of the inner layer 22 and the outer layer 24 are substantially uniform in the second portion 16b, the third portion 16c, and the bottom portion 18 of the body portion 16.
  • FIG. 2 is a cross-sectional view of the double-walled container 30.
  • the double-walled container 30 is a resin container obtained by blow-molding the preform 10.
  • the double-walled container 30 has an outer wall 32, an inner wall 34 connected to the outer wall 32, an inner bottom 36 connected to the inner wall 34, and an opening 38 provided on the opposite side of the inner bottom 36 with the inner wall 34 interposed therebetween.
  • the outer wall 32 and the inner wall 34 are connected to each other via an edge 33 at an end portion on the opening 38 side.
  • the opposite end of the opening 38 of the inner wall 34 is connected via the inner bottom 36.
  • the portion 32a on the opening 38 side of the outer wall 32, the edge portion 33, the inner wall 34, and the inner bottom 36 are composed of an inner layer (base layer) 42 made of recycled material and an outer layer (coating layer) 44 made of virgin material. It has a two-layer structure.
  • the recycled material and the virgin material are the same materials as those described in Preform 10.
  • the portion 32b of the outer wall 32 other than the portion 32a on the opening 38 side is made of a recycled material.
  • the portion 32b and the inner layer 42 in the two-layer structure are continuous and are made of the same material.
  • the third portion 16c of the preform 10 described above corresponds to the portion 34a on the opening 38 side of the inner wall 34 of the double-walled container 30, the edge 33 and the portion 32a on the opening 38 side of the outer wall 32.
  • the outer layer 44 of the inner wall 34 and the inner bottom 36 has a concave shape, and the contents such as beverages contained in the double-walled container 30 are configured to come into contact with the concave outer layer 44.
  • the distance (diameter) between the inner walls 34 is smaller than the distance (diameter) between the outer walls 32, and the inner wall 34 is arranged inside the outer wall 32.
  • the edge 33 has an inner diameter of the same size as the inner diameter of the inner wall 34 on the opening 38 side, and has an outer diameter of the same size as the outer diameter of the outer wall 32 on the opening 38 side.
  • a space is formed between the inner wall 34 and the outer wall 32.
  • the end of the outer wall 32 on the outer side of the inner wall 34 opposite to the opening 38 is open, and the outer bottom 39 of the double-walled container 30 is open.
  • a medium such as air enters the space between the inner wall 34 and the outer wall 32 to obtain a heat insulating effect.
  • the double-walled container 30 can be used for applications such as coffee cups.
  • the weight ratio of the recycled material contained in the double-walled container 30 to the virgin material contained in the double-walled container 30 is 2 or more.
  • the outer wall 32 is the total weight of the portion 32b of the outer wall 32 other than the portion 32a on the opening 38 side and the portion 32a of the outer wall 32 on the opening 38 side, the edge portion 33, the inner wall 34, and the inner layer 42 of the inner bottom 36.
  • the weight ratio of the outer layer 44 to the weight of the portion 32a on the opening 38 side, the edge 33, the inner wall 34, and the inner bottom 36 is 2 or more.
  • the ratio to the length in the direction extending from 38 to the inner bottom 36 is preferably greater than 0 and 5 or less. Further, the ratio is more preferably 0.06 or more, and particularly preferably 0.1 or more. Further, the ratio is more preferably 3 or less, further preferably 1 or less, and particularly preferably 0.5 or less. Within the numerical range, the ratio of recycled materials used can be further improved, and the double-walled container 30 is more excellent in terms of hygiene during use.
  • the thicknesses of the inner layer 42 and the outer layer 44 are substantially uniform.
  • FIG. 3 is a flowchart showing a manufacturing process of the preform 10.
  • FIG. 4 is a diagram showing an aspect of injection molding of the preform 10.
  • the method for producing the preform 10 of the present embodiment includes a first step S1 and a second step S2, which are two-step injection molding steps.
  • the first step S1 is a step of injecting a recycled material into a first mold to inject and mold a primary molded body.
  • the second step S2 is a step of accommodating the primary molded body in the second mold, injecting a virgin material, and injecting the secondary molded body.
  • the cavity formed by the first mold 50 composed of the first cavity mold 52, the first injection core mold 54, and the neck mold 56 is formed through the first gate 58.
  • Inject recycled material When the filling of the recycled material into the cavity is completed, the primary molded body 60 is formed by maintaining the mold clamping of the first mold 50 for a predetermined time and then opening the mold 50.
  • the first cavity type 52 and the first injection core type 54 are provided with a circuit (medium flow hole or medium flow groove) through which a cooling medium (fluid) for cooling the primary molded body 60 flows, and the cooling medium thereof. Is appropriately set in the range of, for example, about 5 ° C to about 20 ° C.
  • the primary molded body 60 to be molded includes an opening 62, a neck portion 64 connected to the opening 62, a body portion 66 connected to the neck portion 64, and a bottom portion 68 connected to the body portion 66.
  • the body portion 66 includes a first partially scheduled portion (first partial forming portion) 66a on the neck portion 64 side, a second partially scheduled portion (second partial forming portion) 66b on the bottom 68 side, and a first portion.
  • a third partial scheduled portion (third partial forming portion) 66c between the scheduled portion 66a and the second partial scheduled portion 66b is provided.
  • the thickness of the second partially scheduled portion 66b, the third partially scheduled portion 66c, and the bottom portion 68 of the body portion 66 is thinner than the thickness of the first partially scheduled portion 66a. Further, although not particularly limited, the second partially scheduled portion 66b and the second portion of the body portion 66 having a length in the direction extending from the neck portion 64 to the bottom portion 68 of the first partially scheduled portion 66a of the body portion 66.
  • the ratio of the total length of the partial planned portion 66c in the direction extending from the neck portion 64 to the bottom portion 68 is the ratio of the first portion 16a of the above-mentioned preform 10 to the second portion 16b and the third portion 16c. It is preferable that the embodiment is similar to the length ratio.
  • the molded primary molded body 60 is raised together with the first injection core mold 54 and the neck mold 56 and separated from the first cavity mold 52. Further, the first injection core mold 54 is further raised and separated from the primary molded body 60. Then, the primary molded body 60 is rotated together with the neck mold 56 by a rotating means (not shown) while being held by the neck mold 56, and is arranged above the second cavity mold 72.
  • the neck mold 56 holding the primary molded body 60 is molded with respect to the second injection core mold 74 and the second cavity mold 72 to form the second cavity mold 72 and the second cavity mold 72.
  • the primary molded body 60 is housed in a second mold 70 composed of the injection core mold 74 and the neck mold 56. Then, in the cavity formed by the second mold 70, the second partially scheduled portion 66b and the third partially scheduled portion 66c of the body portion 66 of the primary molded body 60 and the second portion outside the bottom portion 68.
  • the virgin material is injected through the gate 78.
  • the first step S1 of the next preform 10 is carried out during the second step S2 of the previous preform 10.
  • the second cavity type 72 and the second injection core type 74 are also provided with a circuit through which a cooling medium for cooling the secondary molded body 80 and the primary molded body 60 flows, and the cooling medium is, for example, about 5 ° C. It is appropriately set within the range of about 20 ° C.
  • the temperature of the cooling medium that is, the cooling intensity may be different between the first mold 50 and the second mold 70 (for example, cooling of the second mold 70 from the first mold 50). Set the temperature of the medium low.).
  • the cooling strength may be changed between the second cavity mold 72 and the second injection core mold 74 (for example, the second cavity mold than the second injection core mold 55). The temperature of the cooling medium of 72 is set low.).
  • the primary molded body 60 and the secondary molding are formed so that the weight ratio of the recycled material contained in the preform 10 to the virgin material contained in the preform 10 is 2 or more. Mold the body 80.
  • the secondary molded body is injection-molded so that the thickness of the body 16 and the bottom 18 of the preform 10 is uniform.
  • the thicknesses of the second partially scheduled portion 66b, the third partially scheduled portion 66c, and the bottom portion 68 of the primary molded body are substantially the same as the thickness of the secondary molded body.
  • the third partially planned portion 66c of the primary molded body 60 and the secondary molded body 80 formed on the outside thereof are on the opening 38 side of the inner wall 34 of the double wall container 30 formed from the preform 10.
  • the portion 32a on the opening 38 side of the portion and the outer wall 32 corresponds to the portion 32a on the opening 38 side of the portion and the outer wall 32 (see FIG. 2).
  • FIG. 5 is a flowchart showing a manufacturing process of the double-walled container 30.
  • FIG. 6 is a diagram showing a mode of blow molding of an intermediate molded product described later.
  • FIG. 7 is a diagram showing an aspect of a pressing process for molding the double-walled container 30.
  • the method for manufacturing the double-walled container 30 of the present embodiment includes a blowing step S3 and a pressing step S4.
  • the blow step S3 is a step of forming an intermediate molded product by stretching and blowing the preform 10.
  • the pressing step S4 is a step of pressing the intermediate molded product to form the double-walled container 30.
  • the blow process S3 will be described with reference to FIG.
  • the preform 10 (not shown) held in the blow neck type 92 is housed in the blow molding unit 90 including at least the blow cavity type 94, the blow bottom type 96 and the drawing rod 98, and the preform 10 is placed.
  • the intermediate molded product 100 is molded by blowing with a blow medium.
  • the pressing rod 96a may be provided on the blow bottom type.
  • a gas such as air can be used.
  • a liquid such as water may be used, or a mixed medium of gas and liquid may be used.
  • the intermediate molded product 100 molded in the blow step S3 includes an inner wall corresponding portion 104 corresponding to the inner wall 34 of the double wall container 30, an outer wall corresponding portion 102 corresponding to the outer wall 32 of the double wall container 30, and a double wall. It has an inner bottom corresponding portion 106 corresponding to the inner bottom 36 of the container 30.
  • the inner bottom corresponding portion 106 is configured to be connected to the inner wall corresponding portion 104.
  • the inner wall corresponding portion 104 is configured to be connected to the outer wall corresponding portion 102.
  • the inner wall corresponding portion 104 and the inner bottom corresponding portion 106 are formed so as to bulge from the outer wall corresponding portion 102.
  • the portion 102a on the inner bottom corresponding portion 106 side of the outer wall corresponding portion 102, the inner wall corresponding portion 104 and the inner bottom corresponding portion 106 are two layers composed of an inner layer 112 made of recycled material and an outer layer 114 made of virgin material. It has a structure.
  • the recycled material and the virgin material are the same materials as those described in Preform 10.
  • the portion 102b other than the portion 102a on the inner bottom corresponding portion 106 side of the outer wall corresponding portion 102 is made of a recycled material.
  • the portion 102b and the inner layer 112 in the two-layer structure are continuous and are made of the same material.
  • the third portion 16c of the preform 10 described above corresponds to the portion 102a of the inner wall corresponding portion 104 of the intermediate molded product 100 on the outer wall corresponding portion 102 side and the portion 102a of the outer wall corresponding portion 102 on the inner bottom corresponding portion 106 side.
  • the pressing step S4 will be described with reference to FIG. 7.
  • the inner bottom corresponding portion 106 of the intermediate molded product 100 molded in the blow step S3 is pressed in the blow molding unit 90, and the inner wall corresponding portion 104 formed so as to bulge from the outer wall corresponding portion 102. Is inverted to the inside of the outer wall corresponding portion 102 to form the double wall container 30.
  • the inner bottom corresponding portion 106 is pressed by raising the pressing rod 96a provided in the blow bottom type 96 so as to be able to move up and down.
  • the stretching rod 98 may be raised together, or the stretching rod 98 may be raised in advance.
  • the double-walled container 30 is formed.
  • the pressing step S4 does not have to be performed in the blow molding unit 90. For example, it may be carried out at the reversing part or the taking-out part provided on the downstream side of the blow molding part, or may be carried out by another mechanism (device) after taking out the intermediate molded product 100 from the manufacturing apparatus.
  • the pressing step S4 shows another aspect of the pressing step S4, which is carried out by a reversing portion or an taking-out portion provided on the downstream side of the blow molding portion in the manufacturing apparatus, or an apparatus (pressing apparatus) different from the manufacturing apparatus. It is a figure which shows.
  • the intermediate molded product 100 in which the inner wall corresponding portion 104 and the inner bottom corresponding portion 106 are in a softened state and the outer wall corresponding portion 102 is in a solidified state is housed in the accommodating die 310 (FIG. 8), and the convex pressing metal is used.
  • the mold 330 may be moved to the accommodation mold 310 side, the inner bottom corresponding portion 106 may be pushed into the accommodating recess 311 of the accommodating mold 310, and the inner wall corresponding portion 104 may be inverted to the inside of the outer wall corresponding portion 102 (FIG. 9).
  • the portion is held (pressed) in a fixed position by the flat surface (upper surface) of the accommodating mold 310 located on the opening side of the accommodating recess 311 and the flat surface (lower surface) of the ring-shaped mold movable with respect to the accommodating recess 311. You may let me.
  • the convex pressing die 330 is a cylindrical die that tapers toward the tip.
  • the convex pressing die 330 is sized so that it does not come into contact with the housing recess 311 when it is moved to the storage recess 311 of the storage die 310.
  • the outer shape of the convex pressing die 330 is transferred as the outer shape of the inner wall 34 of the double wall container 30.
  • the manufacturing apparatus includes a first injection molding section for injection molding a preform, a second injection molding section, a temperature control section for controlling the temperature of the molded preform 10 to a suitable temperature for blowing, and a temperature-controlled preform 10. 5 to 6 stations including at least a blow-molded part for molding the intermediate molded product 100 or the double-walled container 30 by blowing, and a take-out part for taking out the molded intermediate molded product 100 or the double-walled container 30.
  • a formula manufacturing apparatus (blow molding apparatus) can be mentioned (see Japanese Patent Application Laid-Open No. 55-11136).
  • the intermediate molded product 100 is taken out from the manufacturing apparatus at the take-out portion, another mechanism (pressing mechanism) is provided as a part of the manufacturing apparatus on the downstream side of the manufacturing apparatus.
  • the modes of the injection molding part and the blow molding part the configurations of the modes (FIGS. 4, FIG. 6, FIG. 7, FIG. 8 and FIG. 9) described in the manufacturing method of the preform 10 and the manufacturing method of the double-walled container 30, respectively. Is adopted.
  • the manufacturing apparatus is a hot parison type resin container manufacturing apparatus, and continuously manufactures the preform 10 and the intermediate molded product 100 or the double-walled container 30.
  • FIG. 10 is a diagram showing an example of a 6-station type manufacturing apparatus.
  • the 6-station type manufacturing apparatus 350 shown in FIG. 10 is formed by a first injection molding unit 352 that injects recycled material from a first injection device 362 to inject and molds a primary molded body, and a first injection molding unit 352.
  • the virgin material is injected from the second injection device 363 to the outside of the first temperature control section 354 for controlling the temperature of the primary molded body and the primary molded body temperature controlled by the first temperature control section 354, and the secondary is secondary.
  • the preform 10 and the intermediate molded product 100 or the double-walled container 30 are conveyed in the direction of the arrow shown by the conveying device 370 composed of a turntable or the like.
  • another mechanism is provided as a part of the manufacturing apparatus on the downstream side of the manufacturing apparatus 350.
  • FIG. 11 is a diagram showing a flow of a manufacturing method of an intermediate molded product or a double-walled container when a 6-station type manufacturing apparatus is adopted.
  • the method for manufacturing an intermediate molded product or a double-walled container carried out by the 6-station type manufacturing apparatus 350 shown in FIG. 10 includes a first injection molding step S31 in which a recycled material is injected to inject a primary molded product, and a first injection molding step S31.
  • a first temperature control step S32 for controlling the temperature of the primary molded body formed in the injection molding step S31 of 1, and a virgin material is injected to the outside of the primary molded body temperature controlled in the first temperature control step S32.
  • the second temperature control step S34 for controlling the temperature of the molded preform 10 to a suitable temperature for blowing, and the temperature-controlled preform 10.
  • a blow molding step S35 for molding the intermediate molded product 100 or the double-walled container 30 is provided.
  • the blow molding step S35 includes at least the above-mentioned blow step.
  • the above-mentioned pressing step is preferably carried out in the blow molding step S35, but it is carried out in the reversing part or the taking-out part provided on the downstream side, or by another mechanism after taking out the intermediate molded product 100 from the manufacturing apparatus 350. It doesn't matter if you do it
  • the body is composed of an inner / outer double wall, and an appropriate space is formed between the inner wall and the outer wall to obtain a heat insulating effect (cold heat insulating effect).
  • the present inventors diligently studied a resin container that uses a large amount of recycled material and has excellent hygiene during use. As a result, it was found that by manufacturing a double-walled container with a specific preform, it is possible to form a double-walled container having excellent hygiene during use even if the ratio of recycled materials used is large. That is, the neck portion 14 and the first portion 16a of the body portion 16 are made of recycled material, and the second portion 16b and third portion 16c of the body portion 16 and the bottom portion 18 are made of recycled material.
  • preform 10 which has a two-layer structure composed of an outer layer 24 made of a virgin material and a container inner surface of the inner wall 34 and the inner bottom 36 of the double-walled container 30 to be molded and the user.
  • a part of the outer wall 32 that comes into contact with the lips, including the outer surface of the container, can be made of virgin material, the container can be made excellent in terms of hygiene, and a high proportion of recycled material is used. can do.
  • the neck portion 14 and the first portion 16a of the body portion 16 are made of recycled material, and the second portion 16b and the third portion 16c of the body portion 16 and a part of the bottom portion 18 are formed.
  • the recycled material can be used in a weight ratio of 2 or more with respect to the virgin material, and the recycled material can be used in a high ratio.
  • the thickness of the second partially scheduled portion 66b, the third partially scheduled portion 66c, and the bottom portion 68 of the body portion 66 is set to the thickness of the first portion of the body portion 66.
  • the primary molded body 60 which is thinner than the thickness of the partially planned portion 66a, is injection-molded, and in the second step S2, the second partially planned portion 66b and the third partially scheduled portion 66b of the body portion 66 of the primary molded body 60.
  • the secondary molded body 80 is formed on the outside of the 66c and the bottom portion 68 to form the preform 10.
  • the portion including the outer surface of the container can be made of a virgin material, the container can be made excellent in terms of hygiene, and a high proportion of recycled material can be used.
  • the secondary molded body 80 is injection-molded so that the thicknesses of the body 16 and the bottom 18 of the preform 10 are uniform, so that the double-walled container 30 is highly productive.
  • a preform 10 capable of forming the above can be provided.
  • the double-walled container 30 is composed of a portion 32a on the opening 38 side of the outer wall 32, an inner layer 42 whose inner wall 34 and inner bottom 36 are made of recycled material, and an outer layer 44 made of virgin material.
  • the inner wall 34 of the double-walled container 30 and the inner surface of the inner bottom 36 and the user's lips can be formed.
  • a part of the outer wall 32 in contact including the outer surface of the container can be made of virgin material, the container can be made excellent in terms of hygiene, and a high proportion of recycled material can be used. it can.
  • the present invention is not limited to the above-described embodiment, and can be freely modified, improved, and the like as appropriate.
  • the material, shape, size, numerical value, form, number, arrangement location, etc. of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.
  • the virgin material and the recycled material use PP resin as a base material
  • the materials are not limited thereto.
  • the recycled material and the virgin material may be made of different base resin materials.
  • the edge 33 of the double-walled container 30 of the above embodiment has an inner diameter of the same size as the inner diameter of the inner wall 34 on the opening 38 side and the same size as the outer diameter of the outer wall 32 on the opening 38 side.
  • the present invention is not limited thereto.
  • it may be a flange-shaped edge having an outer diameter larger than the outer diameter on the opening 38 side of the outer wall 32.
  • blow step S3 and the pressing step S4 are carried out in the same blow molding unit 90 in the above embodiment
  • the blow step S3 may be performed by one molding unit to mold the intermediate molded product 100, and the intermediate molded product 100 may be moved to another molding unit to carry out the pressing step S4.
  • the temperature of the intermediate molded product 100 is adjusted so that the intermediate molded product 100 can be pressed and reversed in the pressing step S4.
  • the blow step S3 and the pressing step S4 are carried out in the same blow molding unit 90, the number of steps can be reduced, which is preferable.
  • the manufacturing apparatus of the double-walled container 30 of the 5 to 6 station type has been described in the above embodiment, the present invention is not limited to this aspect. It may be a manufacturing apparatus composed of a blow molding part which forms a double-walled container 30 from a preform 10 manufactured by another manufacturing apparatus. Further, it may be a manufacturing apparatus including at least an injection molding unit and a blow molding unit.
  • a resin preform having an opening, a neck portion connected to the opening, a body portion connected to the neck portion, and a bottom portion connected to the body portion.
  • the body includes a first portion on the neck side, a second portion on the bottom side, and a third portion between the first portion and the second portion.
  • the neck portion and the first portion of the body portion are made of recycled material.
  • a preform having a two-layer structure in which the second portion, the third portion, and the bottom portion of the body portion are composed of an inner layer made of a recycled material and an outer layer made of a virgin material.
  • the body portion is a first partial scheduled portion on the neck portion side, a second partially scheduled portion on the bottom side, and a third portion between the first partially scheduled portion and the second partially scheduled portion.
  • the thickness of the second planned portion, the third planned portion, and the bottom portion of the body portion is thinner than the thickness of the first partially scheduled portion.
  • the secondary molded body injection-molded in the second step is formed on the outside of the second partially scheduled portion, the third partially scheduled portion, and the bottom portion of the body portion of the primary molded body.
  • Preform manufacturing method [5] The method for producing a preform according to [4], wherein the weight ratio of the recycled material injected in the first step to the virgin material injected in the second step is 2 or more.
  • a resin double-walled container having an outer wall, an inner wall connected to the outer wall, an inner bottom connected to the inner wall, and an opening provided on the side opposite to the inner bottom across the inner wall.
  • the opening-side portion of the outer wall, the inner wall and the inner bottom have a two-layer structure composed of an inner layer made of recycled material and an outer layer made of virgin material.
  • the portion of the outer wall other than the portion on the opening side is made of recycled material.
  • a method for manufacturing a double-walled container which comprises a pressing step of molding a double-walled container.
  • the intermediate molded product has an inner wall corresponding portion corresponding to the inner wall, an outer wall corresponding portion corresponding to the outer wall, and an inner bottom corresponding portion corresponding to the inner bottom.
  • the inner wall corresponding portion and the inner bottom corresponding portion are formed so as to bulge from the outer wall corresponding portion.
  • the double-walled container is pressed by pressing the inner bottom corresponding portion so that the inner wall corresponding portion formed so as to bulge from the outer wall corresponding portion is inverted to the inside of the outer wall corresponding portion.
  • the body of the preform comprises a first portion on the neck side, a second portion on the bottom side and a third portion between the first portion and the second portion.
  • the neck portion and the first portion of the body portion are made of recycled material.

Landscapes

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

Abstract

Dans ce procédé de fabrication d'une préforme en résine (10) qui comprend un corps moulé primaire (60) et un corps moulé secondaire (80), le corps moulé primaire (60) obtenu par moulage par injection dans une première étape comprend une partie ouverture (12), une partie col (14), une partie tronc (16) et une partie inférieure (18). La partie tronc (16) comprend une section de partie à placer en premier (16a) du côté de la partie col (14), une section de partie à placer en deuxième (16b) du côté de la partie inférieure (18), et une section de partie à placer en troisième (16c) entre la section de partie à placer en premier (16a) et la section de partie à placer en deuxième (16b). L'épaisseur de chacune de la section de partie à placer en deuxième (16b) et de la section de partie à placer en troisième (16c) de la partie tronc (16) et de la partie inférieure (18) est inférieure à l'épaisseur de la section de partie à placer en premier (16a). Le corps moulé secondaire (80) obtenu par moulage par injection dans une seconde étape est formé sur le côté externe de la partie inférieure (18) et de la section de partie à placer en deuxième (16b) et de la section de partie à placer en troisième (16c) de la partie tronc (16) dans le corps moulé primaire (60).
PCT/JP2020/025330 2019-06-28 2020-06-26 Procédé de fabrication d'une préforme, récipient à double paroi et procédé de fabrication d'un récipient à double paroi WO2020262644A1 (fr)

Priority Applications (1)

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JP2019121122 2019-06-28

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003312721A (ja) * 2002-04-23 2003-11-06 Toyo Seikan Kaisha Ltd 多層プラスチック容器
JP2005205906A (ja) * 2003-12-26 2005-08-04 Toyobo Co Ltd 熱収縮性ポリエステル系フィルムおよび熱収縮性ラベル

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003312721A (ja) * 2002-04-23 2003-11-06 Toyo Seikan Kaisha Ltd 多層プラスチック容器
JP2005205906A (ja) * 2003-12-26 2005-08-04 Toyobo Co Ltd 熱収縮性ポリエステル系フィルムおよび熱収縮性ラベル

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