WO2020262644A1 - Method for manufacturing preform, double-wall container, and method for manufacturing double-wall container - Google Patents

Method for manufacturing preform, double-wall container, and method for manufacturing double-wall container 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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WO
WIPO (PCT)
Prior art keywords
wall
double
walled container
preform
molded body
Prior art date
Application number
PCT/JP2020/025330
Other languages
French (fr)
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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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/en

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    • 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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
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Abstract

In this method for manufacturing a resin-made preform (10) that includes a primary molded body (60) and a secondary molded body (80), the primary molded body (60) obtained by injection molding in a first step is provided with an opening part (12), a neck part (14), a trunk part (16), and a bottom part (18). The trunk part (16) is provided with a to-be-first-portion section (16a) on the neck part (14) side, a to-be-second-portion section (16b) on the bottom part (18) side, and a to-be-third-portion section (16c) between the to-be-first-portion section (16a) and the to-be-second-portion section (16b). The thickness of each of the to-be-second-portion section (16b) and the to-be-third-portion section (16c) of the trunk part (16) and the bottom part (18) is less than the thickness of the to-be-first-portion section (16a). The secondary molded body (80) obtained by injection molding in a second step is formed on the outer side of the bottom part (18) and the to-be-second-portion section (16b) and the to-be-third-portion section (16c) of the trunk part (16) in the primary molded body (60).

Description

プリフォームの製造方法、二重壁容器および二重壁容器の製造方法Preform manufacturing method, double-walled container and double-walled container manufacturing method
　本発明は、プリフォームの製造方法、二重壁容器および二重壁容器の製造方法に関する。 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.
　特許文献１には、内層が新生プラスチック、外層が再生プラスチックで構成される２層構造のプラスチック製ボトルが開示されている。特許文献２には、リサイクル樹脂により筒状の外層材を成形する外層成形工程と、外層材の内面側に外層材よりも薄肉の筒状のバージン樹脂で構成される内層材を積層成形する内層成形工程と、を有する積層樹脂成形品の製造方法が開示されている。 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.
日本国特開２００２－１０３４２９号公報Japanese Patent Application Laid-Open No. 2002-103429 日本国特開２００２－１０４３６２号公報Japanese Patent Application Laid-Open No. 2002-104362
　近年プラスチックごみによる海洋汚染が大きく問題視されるようになり、プラスチックの３Ｒ（リユース、リデュース、リサイクル）の取り組みが国際的に活発化してきている。食品／飲料／医薬品用ボトル（食品系容器）で、内外二層構造で射出成形されたプリフォームをブロー成形し、内容物が接触する部分（内層）はバージン材、非接触部分（外層）はリサイクル材を、各々利用するという方法が開発されている。 In recent years, marine pollution caused by plastic waste has become a major issue, and plastic 3R (reuse, reduce, recycle) initiatives are becoming more active internationally. In a food / beverage / pharmaceutical bottle (food container), a preform that is injection-molded with an inner / outer two-layer structure is blow-molded, and the part that comes into contact with the contents (inner layer) is virgin material, and the non-contact part (outer layer) is A method of using each recycled material has been developed.
　ここで、樹脂製容器の中には、断熱作用（保冷保温作用）を備えたカップ式のものが存在する。この種の容器では、胴部を内外二重壁の構成とし、内壁と外壁との間に適度な空間を形成させることで断熱作用を得るようにしている。当該容器においてもリサイクル材を積極的に活用すべきであるところ、使用時の衛生面で優れつつリサイクル材を利用可能にしたものは現状開発されていない。 Here, among the resin containers, there is a cup type container having a heat insulating effect (cold heat insulating effect). In this type of container, 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. Although 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.
　本発明は、リサイクル材の使用比率が大きくても使用時の衛生面で優れる二重壁容器を形成できるプリフォームの製造方法、当該二重壁容器及び二重壁容器の製造方法を提供することを目的とする。 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.
　上記課題を解決することのできる本発明の一態様は、
　第１の金型にリサイクル材を射出し一次成形体を射出成形する第１の工程と、
　第２の金型に前記一次成形体を収容して、バージン材を射出し二次成形体を射出成形する第２の工程と、を含む、前記一次成形体および前記二次成形体を含む樹脂製のプリフォームの製造方法であって、
　前記第１の工程において射出成形される前記一次成形体は、開口部と、前記開口部と連なるネック部と、前記ネック部と連なる胴部と、前記胴部と連なる底部と、を備え、
　　前記胴部は、前記ネック部側の第１の部分予定部、前記底部側の第２の部分予定部および前記第１の部分予定部と前記第２の部分予定部との間の第３の部分予定部を備え、
　　前記胴部の前記第２の部分予定部および前記第３の部分予定部並びに前記底部の厚みは、前記第１の部分予定部の厚みよりも薄く、
　前記第２の工程において射出成形される前記二次成形体は、前記一次成形体の前記胴部の前記第２の部分予定部および前記第３の部分予定部並びに前記底部の外側に形成される、プリフォームの製造方法である。 One aspect of the present invention capable of solving the above problems is
The first step of injecting recycled material into the first mold to inject and mold the primary molded body,
A resin containing the primary molded body and the secondary molded body, which comprises a second step of accommodating the primary molded body in a second mold, injecting a virgin material, and injection molding the secondary molded body. It is a manufacturing method of preform made of
The primary molded body that is injection-molded in the first step includes an opening, a neck portion that connects to the opening, a body portion that connects to the neck portion, and a bottom portion that connects to the body portion.
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. With a partial schedule
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 method for manufacturing preforms.
　上記課題を解決することのできる本発明の別の態様は、
　外壁と、前記外壁と連なる内壁と、前記内壁と連なる内底と、前記内壁を挟んで前記内底と反対側に設けられた開口と、を有する樹脂製の二重壁容器であって、
　前記外壁の前記開口側の部分、前記内壁および前記内底は、リサイクル材で構成される内層およびバージン材で構成される外層により構成される二層構造を備え、
　前記外壁における前記開口側の部分以外の部分は、リサイクル材で構成されており、
　前記内壁および前記内底の前記外層は、前記二重壁容器に収容される内容物が接触するように構成されている、二重壁容器である。 Another aspect of the present invention capable of solving the above problems is
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.
　上記課題を解決することのできる本発明の別の態様は、
　開口部と、前記開口部と連なるネック部と、前記ネック部と連なる胴部と、前記胴部と連なる底部と、を備える樹脂製のプリフォームを延伸ブローすることにより中間成形品を成形するブロー工程と、
　前記中間成形品を押圧して、外壁と、前記外壁と連なる内壁と、前記内壁と連なる内底と、前記内壁を挟んで前記内底と反対側に設けられた開口と、を有する樹脂製の二重壁容器を成形する押圧工程と、を含む、二重壁容器の製造方法であって、
　前記中間成形品は、前記内壁に対応する内壁対応部と、前記外壁に対応する外壁対応部と、前記内底に対応する内底対応部と、を有し、
　前記内壁対応部および前記内底対応部は、前記外壁対応部から膨出するように形成され、
　前記押圧工程において、前記外壁対応部から膨出するように形成された前記内壁対応部が前記外壁対応部の内側まで反転するように、前記内底対応部を押圧することで前記二重壁容器を成形し、
　前記プリフォームの前記胴部は、前記ネック部側の第１の部分、前記底部側の第２の部分および前記第１の部分と前記第２の部分との間の第３の部分を備え、
　　前記ネック部および前記胴部の前記第１の部分は、リサイクル材で構成され、
　　前記胴部の前記第２の部分および前記第３の部分並びに前記底部は、リサイクル材で構成される内層およびバージン材で構成される外層により構成される二層構造を備える、二重壁容器の製造方法である。 Another aspect of the present invention capable of solving the above problems is
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. Process and
Made of resin by pressing the intermediate molded product to have 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. 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.
In the pressing step, 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. Molded,
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.
　本発明によれば、リサイクル材の使用比率が大きくても使用時の衛生面で優れる二重壁容器を形成できるプリフォームの製造方法、当該二重壁容器及び二重壁容器の製造方法を提供することができる。 According to the present invention, there is provided 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.
実施形態に係るプリフォームを表す断面図である。It is sectional drawing which shows the preform which concerns on embodiment. 実施形態に係る二重壁容器を表す断面図である。It is sectional drawing which shows the double-walled container which concerns on embodiment. 実施形態に係るプリフォームの製造工程を表すフローチャートである。It is a flowchart which shows the manufacturing process of the preform which concerns on embodiment. 実施形態に係るプリフォームの射出成形の態様を表す断面図である。It is sectional drawing which shows the mode of injection molding of the preform which concerns on embodiment. 実施形態に係る二重壁容器の製造工程を表すフローチャートである。It is a flowchart which shows the manufacturing process of the double-walled container which concerns on embodiment. 実施形態に係る中間成形品のブロー成形の態様を表す断面図である。It is sectional drawing which shows the mode of blow molding of the intermediate molded article which concerns on embodiment. 実施形態に係る二重壁容器を成形する押圧工程の態様を表す断面図である。It is sectional drawing which shows the mode of the pressing process which forms the double-walled container which concerns on embodiment. 押圧工程の別の態様を示す図である。It is a figure which shows another aspect of a pressing process. 押圧工程の別の態様を示す図である。It is a figure which shows another aspect of a pressing process. 実施形態に係る中間成形品または二重壁容器の製造装置を示す図である。It is a figure which shows the manufacturing apparatus of the intermediate molded article or a double-walled container which concerns on embodiment. 実施形態に係る製造装置を用いた中間成形品または二重壁容器の製造工程を表すフローチャートである。It is a flowchart which shows the manufacturing process of an intermediate molded article or a double-walled container using the manufacturing apparatus which concerns on embodiment.
　以下、本発明の実施形態について、図面を参照して説明する。尚、本図面に示された各部材の寸法は、説明の便宜上、実際の各部材の寸法とは異なる場合がある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The dimensions of each member shown in this drawing may differ from the actual dimensions of each member for convenience of explanation.
　まず、図１を参照して、実施形態に係るプリフォーム１０について説明する。図１はプリフォーム１０の断面図である。プリフォーム１０は開口部１２、開口部１２と連なるネック部１４、ネック部１４と連なる胴部１６、および胴部１６と連なる底部１８を備える、樹脂成形品である。プリフォーム１０の胴部１６は、ネック部１４側から底部１８側にかけてテーパーしている。胴部１６は、ネック部１４側の第１の部分１６ａ、底部１８側の第２の部分１６ｂおよび第１の部分１６ａと第２の部分１６ｂとの間の第３の部分１６ｃを備えている。 First, the preform 10 according to the embodiment will be described with reference to FIG. 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. ..
　ネック部１４および胴部１６の第１の部分１６ａは、使用済の樹脂材料を再生利用して調製されたリサイクル材で構成される。胴部１６の第２の部分１６ｂおよび第３の部分１６ｃ並びに底部１８は、前述のリサイクル材で構成される内層２２および未使用の樹脂材料であるバージン材で構成される外層２４により構成される二層構造を備える。第１の部分１６ａと前記二層構造における内層２２は連続しており、同一の材料で構成されている。バージン材およびリサイクル材はポリプロピレン（ＰＰ）やポリエチレンテレフタレート（ＰＥＴ）等の合成樹脂を母材とする。プリフォーム１０は後述する二重壁容器３０を成形するために使用される。 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). The preform 10 is used for molding the double-walled container 30, which will be described later.
　プリフォーム１０に含まれるリサイクル材の、プリフォーム１０に含まれるバージン材に対する重量比は２以上である。具体的には、胴部１６の第１の部分１６ａと胴部１６の第２の部分１６ｂおよび第３の部分１６ｃ並びに底部１８における内層２２との合計重量の、胴部１６の第２の部分１６ｂおよび第３の部分１６ｃ並びに底部１８における外層２４の重量に対する重量比は２以上である。また、特に限定されるものではないが、胴部１６の第１の部分１６ａのネック部１４から底部１８へ延びる方向における長さの、胴部１６の第２の部分１６ｂおよび第３の部分１６ｃのネック部１４から底部１８へ延びる方向における長さの合計に対する比が、０．１以上１未満であると好ましい。また、当該比は０．３以上であるとより好ましく、０．５以上であると特に好ましい。また、当該比は０．９以下であるとより好ましく、０．８以下であると特に好ましい。当該数値範囲であることで、リサイクル材の使用比率をより向上でき、使用時の衛生面でより優れた二重壁容器３０を形成できる。また、胴部１６の第２の部分１６ｂおよび第３の部分１６ｃ並びに底部１８において、内層２２および外層２４の厚みは略均一である。 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. Specifically, the second portion of the body portion 16 of the total weight of the first portion 16a of the body portion 16, the second portion 16b and the third portion 16c of the body portion 16, and the inner layer 22 at the bottom portion 18. 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. Further, although not particularly limited, 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.
　次に、図２を参照して、実施形態に係る二重壁容器３０について説明する。図２は二重壁容器３０の断面図である。二重壁容器３０はプリフォーム１０をブロー成形することにより得られた樹脂製容器である。二重壁容器３０は、外壁３２と、外壁３２と連なる内壁３４と、内壁３４と連なる内底３６と、内壁３４を挟んで内底３６の反対側に設けられた開口３８と、を有する。外壁３２と内壁３４とはそれぞれの開口３８側の端部において縁部３３を介して連なっている。内壁３４の開口３８の反対側の端部は内底３６を介して連なっている。外壁３２の開口３８側の部分３２ａ、縁部３３、内壁３４および内底３６は、リサイクル材で構成される内層（ベース層）４２およびバージン材で構成される外層（被覆層）４４により構成される二層構造を備える。リサイクル材およびバージン材はプリフォーム１０において説明したものと同一の材料である。外壁３２における開口３８側の部分３２ａ以外の部分３２ｂは、リサイクル材で構成される。部分３２ｂと前記二層構造における内層４２は連続しており、同一の材料で構成されている。前述のプリフォーム１０の第３の部分１６ｃは、二重壁容器３０の内壁３４の開口３８側の部分３４ａ、縁部３３および外壁３２の開口３８側の部分３２ａに対応する。なお、内壁３４および内底３６の外層４４は凹部形状であり、二重壁容器３０に収容される飲料等の内容物が当該凹部形状の外層４４に接触するように構成されている。 Next, the double-walled container 30 according to the embodiment will be described with reference to FIG. 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.
　図２において外壁３２同士の間隔（直径）よりも内壁３４同士の間隔（直径）は小さく、内壁３４は外壁３２の内側に配置されている。縁部３３は内壁３４の開口３８側の内径と同じ大きさの内径を有し、かつ外壁３２の開口３８側の外径と同じ大きさの外径を有する。内壁３４および外壁３２の間には空間が形成されている。内壁３４より外方側の外壁３２の開口３８と反対側の端部は解放されており、二重壁容器３０の外底３９は開放されている。内壁３４および外壁３２の間の空間に空気等の媒体が入り断熱効果が得られる。二重壁容器３０は、コーヒーカップ等の用途に使用できる。 In FIG. 2, 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.
　二重壁容器３０に含まれるリサイクル材の、二重壁容器３０に含まれるバージン材に対する重量比は２以上である。具体的には、外壁３２における開口３８側の部分３２ａ以外の部分３２ｂと外壁３２の開口３８側の部分３２ａ、縁部３３、内壁３４および内底３６における内層４２との合計重量の、外壁３２の開口３８側の部分３２ａ、縁部３３、内壁３４および内底３６における外層４４の重量に対する重量比は２以上である。また、特に限定されるものではないが、外壁３２の開口３８側の部分３２ａの開口３８から内底３６へ延びる方向における長さの、外壁３２における開口３８側の部分３２ａ以外の部分３２ｂの開口３８から内底３６へ延びる方向における長さに対する比が、０より大きく５以下であると好ましい。また、当該比は０．０６以上であるとより好ましく、０．１以上であると特に好ましい。また、当該比は３以下であるとより好ましく、１以下であるとさらに好ましく、０．５以下であると特に好ましい。当該数値範囲であることで、リサイクル材の使用比率をより向上でき、使用時の衛生面でより優れた二重壁容器３０となる。内層４２および外層４４の厚みは略均一である。 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. Specifically, 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. Further, although not particularly limited, the opening of the portion 32b of the outer wall 32 other than the portion 32a on the opening 38 side of the length in the direction extending from the opening 38 of the portion 32a on the opening 38 side of the outer wall 32 to the inner bottom 36. 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.
　次に、図３および図４を参照して、プリフォーム１０の製造方法について説明する。図３はプリフォーム１０の製造工程を示すフローチャートである。図４はプリフォーム１０の射出成形の態様を示す図である。 Next, a method for manufacturing the preform 10 will be described with reference to FIGS. 3 and 4. 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.
　図３に示すように、本実施形態のプリフォーム１０の製造方法は、二段階の射出成形工程となる、第１の工程Ｓ１と、第２の工程Ｓ２とを含む。第１の工程Ｓ１は、第１の金型にリサイクル材を射出し一次成形体を射出成形する工程である。第２の工程Ｓ２は、第２の金型に前記一次成形体を収容して、バージン材を射出し二次成形体を射出成形する工程である。 As shown in FIG. 3, 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.
　ここで、図４を参照して各工程について説明する。第１の工程Ｓ１では、第１のキャビティ型５２、第１の射出コア型５４およびネック型５６で構成される第１の金型５０が形成するキャビティ内に、第１のゲート５８を介してリサイクル材を射出する。リサイクル材のキャビティ内への充填が完了したところで、所定時間第１の金型５０の型締めを維持し、その後開放することで、一次成形体６０を成形する。なお、第１のキャビティ型５２や第１の射出コア型５４には、一次成形体６０を冷却させる冷却媒体（流体）が流れる回路（媒体流通孔または媒体流通溝）が設けられ、その冷却媒体は、例えば約５℃～約２０℃の範囲内で適宜設定される。 Here, each process will be described with reference to FIG. In the first step S1, 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.
　成形される一次成形体６０は、開口部６２と、開口部６２と連なるネック部６４と、ネック部６４と連なる胴部６６と、胴部６６と連なる底部６８と、を備える。胴部６６は、ネック部６４側の第１の部分予定部（第１の部分形成部）６６ａ、底部６８側の第２の部分予定部（第２の部分形成部）６６ｂおよび第１の部分予定部６６ａと第２の部分予定部６６ｂとの間の第３の部分予定部（第３の部分形成部）６６ｃを備える。胴部６６の第２の部分予定部６６ｂおよび第３の部分予定部６６ｃ並びに底部６８の厚みは、第１の部分予定部６６ａの厚みよりも薄い。また、特に限定されるものではないが、胴部６６の第１の部分予定部６６ａのネック部６４から底部６８へ延びる方向における長さの、胴部６６の第２の部分予定部６６ｂおよび第３の部分予定部６６ｃのネック部６４から底部６８へ延びる方向における長さの合計に対する比は、上述のプリフォーム１０の第１の部分１６ａの、第２の部分１６ｂおよび第３の部分１６ｃに対する長さの比と同様の態様であると好ましい。 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.
　成形された一次成形体６０は、第１の射出コア型５４およびネック型５６と共に上昇されて第１のキャビティ型５２から離される。また、第１の射出コア型５４はさらに上昇されて一次成形体６０から離される。そして、一次成形体６０はネック型５６に保持された状態で図示を省略する回転手段によってネック型５６ごと回転されて、第２のキャビティ型７２の上方に配置される。 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.
　第２の工程Ｓ２では、第２の射出コア型７４および第２のキャビティ型７２に対して一次成形体６０を保持するネック型５６を型締めすることで、第２のキャビティ型７２、第２の射出コア型７４およびネック型５６で構成される第２の金型７０に一次成形体６０を収容する。そして、第２の金型７０が形成するキャビティ内のうちの、一次成形体６０の胴部６６の第２の部分予定部６６ｂおよび第３の部分予定部６６ｃ並びに底部６８の外側に第２のゲート７８を介してバージン材を射出する。バージン材のキャビティ内への充填が完了したところで、所定時間第２の金型７０の型締めを維持し、その後開放することで、一次成形体６０と、その胴部６６の第２の部分予定部６６ｂおよび第３の部分予定部６６ｃ並びに底部６８の外側に形成された二次成形体８０と、を含むプリフォーム１０を成形する。 In the second step S2, 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. When the filling of the virgin material into the cavity is completed, the mold tightening of the second mold 70 is maintained for a predetermined time, and then the mold is opened to plan the second part of the primary molded body 60 and its body 66. A preform 10 including a portion 66b, a third partial scheduled portion 66c, and a secondary molded body 80 formed on the outside of the bottom portion 68 is formed.
　なお、本実施形態では、前のプリフォーム１０の第２の工程Ｓ２の間に、次のプリフォーム１０の第１の工程Ｓ１が実施される。また、第２のキャビティ型７２や第２の射出コア型７４にも、二次成形体８０および一次成形体６０を冷却させる冷却媒体が流れる回路が設けられ、その冷却媒体は、例えば約５℃～約２０℃の範囲内で適宜設定される。なお、第１の金型５０と第２の金型７０とで冷却媒体の温度、つまり、冷却強度を異ならせても良い（例えば、第１の金型５０より第２の金型７０の冷却媒体の温度を低く設定する。）。さらに、第２の金型７０でも、第２のキャビティ型７２と第２の射出コア型７４とで冷却強度を変えても構わない（例えば、第２の射出コア型５５より第２のキャビティ型７２の冷却媒体の温度を低く設定する。）。 In this embodiment, the first step S1 of the next preform 10 is carried out during the second step S2 of the previous preform 10. Further, 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.). Further, in the second mold 70, 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.).
　第１の工程Ｓ１および第２の工程Ｓ２では、プリフォーム１０に含まれるリサイクル材の、プリフォーム１０に含まれるバージン材に対する重量比が２以上となるように、一次成形体６０および二次成形体８０を成形する。第２の工程では、プリフォーム１０の胴部１６および底部１８の厚みが均一になるように二次成形体を射出成形する。本実施形態において、一次成形体の第２の部分予定部６６ｂ、第３の部分予定部６６ｃおよび底部６８の厚みは、二次成形体の厚みと略同一である。一次成形体のこれらの部分（６６ｂ、６６ｃ、６８）の厚みと二次成形体の厚みとの比は、特に限定されるものではないが、例えば、一次成形体のこれらの部分（６６ｂ、６６ｃ、６８）の厚み：二次成形体の厚み＝１：２～５：１としてもよく、特に１：１～３：１に設定されると好ましい。また、一次成形体６０の第１の部分予定部６６ａ、第２の部分予定部６６ｂおよび第３の部分予定部６６ｃは、それぞれプリフォーム１０の第１の部分１６ａ、第２の部分１６ｂおよび第３の部分１６ｃの少なくとも一部を構成する。すなわち、一次成形体６０の第３の部分予定部６６ｃと、その外側に形成された二次成形体８０とは、プリフォーム１０から成形される二重壁容器３０の内壁３４の開口３８側の部分および外壁３２の開口３８側の部分３２ａに対応する（図２参照）。 In the first step S1 and the second step S2, 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. In the second step, 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. In the present embodiment, 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 ratio of the thickness of these parts (66b, 66c, 68) of the primary molded body to the thickness of the secondary molded body is not particularly limited, but for example, these parts (66b, 66c) of the primary molded body. , 68) Thickness: Thickness of the secondary molded product = 1: 2 to 5: 1, and particularly preferably set to 1: 1 to 3: 1. Further, the first partially scheduled portion 66a, the second partially scheduled portion 66b, and the third partially scheduled portion 66c of the primary molded body 60 are the first portion 16a, the second portion 16b, and the third portion of the preform 10, respectively. It constitutes at least a part of the part 16c of 3. That is, 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. Corresponds to the portion 32a on the opening 38 side of the portion and the outer wall 32 (see FIG. 2).
　次に図５～図７を参照して、二重壁容器３０の製造方法について説明する。図５は、二重壁容器３０の製造工程を示すフローチャートである。図６は、後述する中間成形品のブロー成形の態様を表す図である。図７は、二重壁容器３０を成形する押圧工程の態様を表す図である。図５に示すように、本実施形態の二重壁容器３０の製造方法は、ブロー工程Ｓ３と、押圧工程Ｓ４と、を含む。ブロー工程Ｓ３は、プリフォーム１０を延伸ブローすることにより中間成形品を成形する工程である。押圧工程Ｓ４は、中間成形品を押圧して、二重壁容器３０を成形する工程である。 Next, a method for manufacturing the double-walled container 30 will be described with reference to FIGS. 5 to 7. 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. As shown in FIG. 5, 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.
　ここで、図６を参照してブロー工程Ｓ３を説明する。ブロー工程Ｓ３では、ブローネック型９２に保持されたプリフォーム１０（図示省略）を、ブローキャビティ型９４、ブロー底型９６および延伸ロッド９８を少なくとも含むブロー成形ユニット９０に収容し、プリフォーム１０を延伸ロッド９８で延伸させつつ、ブロー媒体でブローして中間成形品１００を成形する。なお、押圧ロッド９６ａをブロー底型に設けても良い。ブロー媒体としては、空気等の気体を用いることができる。また、水などの液体を用いてもよく、気体と液体との混合媒体を用いてもよい。 Here, the blow process S3 will be described with reference to FIG. In the blow step S3, 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. While stretching with the stretching rod 98, 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. As the blow medium, a gas such as air can be used. Further, a liquid such as water may be used, or a mixed medium of gas and liquid may be used.
　ブロー工程Ｓ３で成形される中間成形品１００は、二重壁容器３０の内壁３４に対応する内壁対応部１０４と、二重壁容器３０の外壁３２に対応する外壁対応部１０２と、二重壁容器３０の内底３６に対応する内底対応部１０６と、を有する。内底対応部１０６は、内壁対応部１０４と連なるように構成されている。内壁対応部１０４は外壁対応部１０２と連なるように構成されている。内壁対応部１０４および内底対応部１０６は、外壁対応部１０２から膨出するように形成されている。 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.
　外壁対応部１０２の内底対応部１０６側の部分１０２ａ、内壁対応部１０４および内底対応部１０６は、リサイクル材で構成される内層１１２およびバージン材で構成される外層１１４により構成される二層構造を備える。リサイクル材およびバージン材はプリフォーム１０において説明したものと同一の材料である。外壁対応部１０２の内底対応部１０６側の部分１０２ａ以外の部分１０２ｂは、リサイクル材で構成される。部分１０２ｂと前記二層構造における内層１１２は連続しており、同一の材料で構成されている。前述のプリフォーム１０の第３の部分１６ｃは、中間成形品１００の内壁対応部１０４の外壁対応部１０２側の部分および外壁対応部１０２の内底対応部１０６側の部分１０２ａに対応する。 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.
　続いて、図７を参照して押圧工程Ｓ４を説明する。押圧工程Ｓ４では、ブロー工程Ｓ３で成形された中間成形品１００の内底対応部１０６をブロー成形ユニット９０内で押圧して、外壁対応部１０２から膨出するように形成された内壁対応部１０４を外壁対応部１０２の内側まで反転させて、二重壁容器３０を成形する。具体的にはブロー底型９６が備える昇降可能に構成された押圧ロッド９６ａを上昇させることで、内底対応部１０６を押圧する。この際延伸ロッド９８を併せて上昇させても良く、またあらかじめ延伸ロッド９８を上昇させておいても良い。以上により、二重壁容器３０が成形される。なお、押圧工程Ｓ４は、ブロー成形ユニット９０内で行わなくても構わない。例えば、ブロー成形部の下流側に設けた反転部や取出し部で実施したり、製造装置から中間成形品１００を取り出した後に別の機構（装置）により実施したりしても構わない。 Subsequently, the pressing step S4 will be described with reference to FIG. 7. In the pressing step S4, 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. Specifically, 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. At this time, the stretching rod 98 may be raised together, or the stretching rod 98 may be raised in advance. As described above, 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.
　図８および図９は、製造装置においてブロー成形部の下流側に設けた反転部や取出し部、または、製造装置とは別の装置（押圧装置）で実施される、押圧工程Ｓ４の別の態様を示す図である。押圧工程Ｓ４では、内壁対応部１０４と内底対応部１０６が軟化状態で外壁対応部１０２が固化状態である中間成形品１００を収容金型３１０に収容して（図８）、凸状押圧金型３３０を収容金型３１０側に移動させ、内底対応部１０６を収容金型３１０の収容凹部３１１内に押し込んで、内壁対応部１０４を外壁対応部１０２の内側まで反転させてもよい（図９）。なお、凸状押圧金型３３０を収容金型３１０側に移動させる前、外壁対応部１０２を収容金型３１０の収容凹部３１１に嵌入させた状態で、内壁対応部１０４と外壁対応部１０２の境界部を、収容凹部３１１の開口側に位置する収容金型３１０の平面（上面）と収容凹部３１１に対して移動可能なリング状金型の平面（下面）とにより、位置不動に保持（押圧）させてもよい。凸状押圧金型３３０は、先端に向けてテーパー形状となる円筒形状の金型である。凸状押圧金型３３０は収容金型３１０の収容凹部３１１に移動されたときに、収容凹部３１１に接触しない大きさとされる。この方法では、凸状押圧金型３３０の外形が、二重壁容器３０の内壁３４の外形として転写される。 8 and 9 show 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. In the pressing step S4, 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). Before moving the convex pressing die 330 to the accommodation die 310 side, the boundary between the inner wall corresponding portion 104 and the outer wall corresponding portion 102 in a state where the outer wall corresponding portion 102 is fitted into the accommodating recess 311 of the accommodating die 310. 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. In this method, 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.
　ここで、中間成形品１００または二重壁容器３０の製造装置の一例を説明する。当該製造装置としては、プリフォームを射出成形する第１の射出成形部と第２の射出成形部、成形されたプリフォーム１０をブロー適温に温調する温調部、温調されたプリフォーム１０をブローすることで中間成形品１００または二重壁容器３０を成形するブロー成形部、および成形された中間成形品１００または二重壁容器３０を取り出すための取出部を少なくとも備える、５から６ステーション式の製造装置（ブロー成形装置）が挙げられる（日本国特開昭５５－１１１２３６号参照）。中間成形品１００が取出部で製造装置から取り出される場合、製造装置の下流側に、製造装置の一部として別の機構（押圧機構）が設けられる。射出成形部及びブロー成形部の態様としては、それぞれプリフォーム１０の製造方法及び二重壁容器３０の製造方法において説明した態様（図４、図６、図７、図８および図９）の構成が採用される。当該製造装置は、ホットパリソン式の樹脂製容器の製造装置であって、プリフォーム１０及び中間成形品１００または二重壁容器３０の製造を連続的に実施する。 Here, an example of a manufacturing apparatus for the intermediate molded product 100 or the double-walled container 30 will be described. 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). When 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. As 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.
　図１０は、６ステーション式の製造装置の一例を示す図である。図１０に示す６ステーション式の製造装置３５０は、第１の射出装置３６２からリサイクル材を射出し一次成形体を射出成形する第１の射出成形部３５２と、第１の射出成形部３５２で形成された一次成形体を温調する第１の温調部３５４と、第１の温調部３５４で温調された一次成形体の外側に第２の射出装置３６３からバージン材を射出し二次成形体を射出成形する第２の射出成形部３５３と、成形されたプリフォーム１０をブロー適温に温調する第２の温調部３５５と、温調されたプリフォーム１０をブローすることで中間成形品１００または二重壁容器３０を成形するブロー成形部３５６と、成形された中間成形品１００または二重壁容器３０を取り出すための取出部３５８と、を備える。製造装置３５０において、プリフォーム１０および中間成形品１００または二重壁容器３０は回転盤等で構成される搬送装置３７０によって図示する矢印の方向に搬送される。中間成形品１００が取出部３５８で製造装置３５０から取り出される場合、製造装置３５０の下流側に、製造装置の一部として別の機構（押圧機構）が設けられる。 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. An intermediate between a second injection molding section 353 that injection-molds a molded body, a second temperature control section 355 that controls the temperature of the molded preform 10 to a suitable temperature for blowing, and a temperature-controlled preform 10 by blowing. It is provided with a blow molding unit 356 for molding the molded product 100 or the double-walled container 30, and a take-out unit 358 for taking out the molded intermediate molded product 100 or the double-walled container 30. In the manufacturing apparatus 350, 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. When the intermediate molded product 100 is taken out from the manufacturing apparatus 350 by the take-out portion 358, another mechanism (pressing mechanism) is provided as a part of the manufacturing apparatus on the downstream side of the manufacturing apparatus 350.
　図１１は、６ステーション式の製造装置を採用した場合の中間成形品または二重壁容器の製造方法のフローを示す図である。図１０に示す６ステーション式の製造装置３５０により実施される中間成形品または二重壁容器の製造方法は、リサイクル材を射出し一次成形体を射出成形する第１の射出成形工程Ｓ３１と、第１の射出成形工程Ｓ３１で形成された一次成形体を温調する第１の温調工程Ｓ３２と、第１の温調工程Ｓ３２で温調された一次成形体の外側にバージン材を射出し二次成形体を射出成形する第２の射出成形工程Ｓ３３と、成形されたプリフォーム１０をブロー適温に温調する第２の温調工程Ｓ３４と、温調されたプリフォーム１０をブローすることで中間成形品１００または二重壁容器３０を成形するブロー成形工程Ｓ３５と、を備える。ブロー成形工程Ｓ３５は、上述のブロー工程を少なくとも含む。上述の押圧工程は、ブロー成形工程Ｓ３５で実施されるのが望ましいが、下流側に設けた反転部や取出部で実施したり、製造装置３５０から中間成形品１００を取り出した後に別の機構により実施したりしても構わない 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. By blowing the second injection molding step S33 for injection molding the next molded product, 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
　ところで、プラスチックの３Ｒの取り組みが国際的に活発化する中、例えば、洗剤用／トナー用合成樹脂製容器（非食品系容器）は、使用済容器を粉砕し得られたフレーク材や再生ペレット材とバージン材とのブレンド材が利用され、製造されることが多い。一方、食品／飲料／医薬品用合成樹脂製容器（食品系容器）は衛生面に優れることが要求されるため、リサイクル材の利用はあまり進展していない。 By the way, while the 3Rs of plastics are becoming more active internationally, for example, synthetic resin containers for detergents / toners (non-food containers) are flakes and recycled pellets obtained by crushing used containers. Often manufactured using a blend of virgin and virgin. On the other hand, since synthetic resin containers for food / beverage / pharmaceutical products (food-based containers) are required to have excellent hygiene, the use of recycled materials has not made much progress.
　ここで、樹脂製容器の中には、胴部を内外二重壁の構成とし、内壁と外壁との間に適度な空間を形成させることで断熱作用（保冷保温作用）を得るカップ式のものが存在する。当該容器においてもリサイクル材を積極的に活用すべきであるところ、使用時の衛生面で優れつつリサイクル材を利用可能にしたものは現状開発されていない。 Here, in the resin container, 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). Exists. Although recycled materials should be actively utilized in the containers, no ones that have been developed so that recycled materials can be used while being excellent in hygiene during use.
　本発明者らは、リサイクル材を多く利用しつつも使用時の衛生に優れる樹脂製容器を鋭意検討した。その結果、特定のプリフォームによって二重壁容器を製造することにより、リサイクル材の使用比率が大きくても使用時の衛生面で優れる二重壁容器を形成できることを見出した。すなわち、ネック部１４および胴部１６の第１の部分１６ａがリサイクル材で構成され、胴部１６の第２の部分１６ｂおよび第３の部分１６ｃ並びに底部１８が、リサイクル材で構成される内層２２およびバージン材で構成される外層２４により構成される二層構造を備える、上記のプリフォーム１０によれば、成形される二重壁容器３０の内壁３４および内底３６の容器内側表面および使用者の唇が接触する外壁３２の一部の容器外側表面を含む部分をバージン材で構成することができ、当該容器を衛生面で優れたものとすることができ、かつリサイクル材を高い割合で利用することができる。 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. According to the above-mentioned 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.
　また、上記のプリフォーム１０は、ネック部１４および胴部１６の第１の部分１６ａをリサイクル材で構成し、胴部１６の第２の部分１６ｂおよび第３の部分１６ｃ並びに底部１８の一部もリサイクル材で構成することで、リサイクル材をバージン材に対して２以上の重量比で利用することができ、高い割合でリサイクル材を利用することができている。 Further, in the preform 10, 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. By constructing the recycled material, 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.
　また、上記のプリフォーム１０の製造方法では、第１の工程Ｓ１において、胴部６６の第２の部分予定部６６ｂおよび第３の部分予定部６６ｃ並びに底部６８の厚みを胴部６６の第１の部分予定部６６ａの厚みよりも薄い一次成形体６０を射出成形して、第２の工程Ｓ２において、一次成形体６０の胴部６６の第２の部分予定部６６ｂおよび第３の部分予定部６６ｃ並びに底部６８の外側に二次成形体８０を形成して、プリフォーム１０を形成している。当該製造方法により製造されるプリフォーム１０では、上記で説明したように、成形される二重壁容器３０の内壁３４および内底３６の容器内側表面および使用者の唇が接触する外壁３２の一部の容器外側表面を含む部分をバージン材で構成することができ、当該容器を衛生面で優れたものとすることができ、かつリサイクル材を高い割合で利用することができる。 Further, in the above-mentioned manufacturing method of the preform 10, in the first step S1, 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. In the preform 10 manufactured by the manufacturing method, as described above, one of the inner wall 34 of the double-walled container 30 to be molded, the inner surface of the inner bottom 36 of the container, and the outer wall 32 in contact with the user's lips. 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.
　また、上記のプリフォーム１０の製造方法では、プリフォーム１０の胴部１６および底部１８の厚みが均一になるように二次成形体８０を射出成形することで、生産性良く二重壁容器３０を形成することができるプリフォーム１０を提供できる。 Further, in the above-mentioned manufacturing method of the preform 10, 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.
　また、上記の二重壁容器３０は、外壁３２の開口３８側の部分３２ａ、内壁３４および内底３６がリサイクル材で構成される内層４２およびバージン材で構成される外層４４により構成される二層構造を備え、外壁３２の開口３８側の部分３２ａ以外の部分３２ｂがリサイクル材で構成されることで、二重壁容器３０の内壁３４および内底３６の容器内側表面および使用者の唇が接触する外壁３２の一部の容器外側表面を含む部分をバージン材で構成することができ、当該容器を衛生面で優れたものとすることができ、かつリサイクル材を高い割合で利用することができる。 Further, 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. By providing a layered structure and forming a portion 32b other than the portion 32a on the opening 38 side of the outer wall 32 with a recycled 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.
　なお、本発明は、上述した実施形態に限定されず、適宜、変形、改良等が自在である。その他、上述した実施形態における各構成要素の材質、形状、寸法、数値、形態、数、配置場所等は、本発明を達成できるものであれば任意であり、限定されない。 The present invention is not limited to the above-described embodiment, and can be freely modified, improved, and the like as appropriate. In addition, 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.
　例えば、上記の実施形態において、バージン材およびリサイクル材はＰＰ樹脂を母材とする態様を説明したが、材料がこれに限定されるものではない。ただし、耐熱性に優れる合成樹脂材料を採用すると好ましい。なお、耐熱性が優れている材料であれば、リサイクル材とバージン材とがそれぞれ異なるベース樹脂材料で構成されていても良い。 For example, in the above embodiment, the embodiment in which the virgin material and the recycled material use PP resin as a base material has been described, but the materials are not limited thereto. However, it is preferable to use a synthetic resin material having excellent heat resistance. As long as the material has excellent heat resistance, the recycled material and the virgin material may be made of different base resin materials.
　例えば、上記の実施形態の二重壁容器３０の縁部３３として、内壁３４の開口３８側の内径と同じ大きさの内径を有し、かつ外壁３２の開口３８側の外径と同じ大きさの外径を有するものを説明したが、本発明はこれに限定されるものではない。例えば、外壁３２の開口３８側の外径よりも大きい外径を有する、フランジ形状の縁部としてもよい。 For example, 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. Although the one having the outer diameter of is described, the present invention is not limited thereto. For example, 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.
　また、上記の実施形態において同一のブロー成形ユニット９０内でブロー工程Ｓ３および押圧工程Ｓ４を実施する態様を説明したが、本発明はこの態様に限定されない。ブロー工程Ｓ３を一つの成形ユニットで行って中間成形品１００を成形し、別の成形ユニットに中間成形品１００を移動して押圧工程Ｓ４を実施する態様としても良い。この場合、必要に応じて、押圧工程Ｓ４にて中間成形品１００の押圧反転が可能な状態となるように、中間成形品１００を温調する。なお、同一のブロー成形ユニット９０内でブロー工程Ｓ３および押圧工程Ｓ４を実施する場合は工程数を削減することができ好ましい。 Further, although the embodiment in which the blow step S3 and the pressing step S4 are carried out in the same blow molding unit 90 in the above embodiment has been described, the present invention is not limited to this 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. In this case, if necessary, 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. When 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.
　また、上記の実施形態において５～６ステーション式の二重壁容器３０の製造装置を説明したが、本発明はこの態様に限定されない。別の製造装置で製造されたプリフォーム１０から二重壁容器３０を成形するブロー成形部で構成される製造装置であってもよい。また、少なくとも射出成形部およびブロー成形部を備える製造装置としてもよい。 Further, although 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.
　以下、上述した実施形態およびその変形から抽出される態様を列記する。
［１］
　開口部と、前記開口部と連なるネック部と、前記ネック部と連なる胴部と、前記胴部と連なる底部と、を備える樹脂製のプリフォームであって、
　前記胴部は、前記ネック部側の第１の部分、前記底部側の第２の部分および前記第１の部分と前記第２の部分との間の第３の部分を備え、
　前記ネック部および前記胴部の前記第１の部分は、リサイクル材で構成され、
　前記胴部の前記第２の部分および前記第３の部分並びに前記底部は、リサイクル材で構成される内層およびバージン材で構成される外層により構成される二層構造を備える、プリフォーム。
［２］
　プリフォームに含まれるリサイクル材の、プリフォームに含まれるバージン材に対する重量比は２以上である、［１］に記載のプリフォーム。
［３］
　外壁と、前記外壁と連なる内壁と、前記内壁と連なる内底と、を有する二重壁容器を成形するためのプリフォームであって、前記第３の部分は前記二重壁容器の前記内壁の少なくとも一部および前記外壁の少なくとも一部に対応する、［１］または［２］に記載のプリフォーム。
［４］
　第１の金型にリサイクル材を射出し一次成形体を射出成形する第１の工程と、
　第２の金型に前記一次成形体を収容して、バージン材を射出し二次成形体を射出成形する第２の工程と、を含む、前記一次成形体および前記二次成形体を含む樹脂製のプリフォームの製造方法であって、
　前記第１の工程において射出成形される前記一次成形体は、開口部と、前記開口部と連なるネック部と、前記ネック部と連なる胴部と、前記胴部と連なる底部と、を備え、
　　前記胴部は、前記ネック部側の第１の部分予定部、前記底部側の第２の部分予定部および前記第１の部分予定部と前記第２の部分予定部との間の第３の部分予定部を備え、
　　前記胴部の前記第２の部分予定部および前記第３の部分予定部並びに前記底部の厚みは、前記第１の部分予定部の厚みよりも薄く、
　前記第２の工程において射出成形される前記二次成形体は、前記一次成形体の前記胴部の前記第２の部分予定部および前記第３の部分予定部並びに前記底部の外側に形成される、プリフォームの製造方法。
［５］
　前記第１の工程で射出される前記リサイクル材の、前記第２の工程で射出される前記バージン材に対する重量比は２以上である、［４］に記載のプリフォームの製造方法。
［６］
　前記第２の工程において、プリフォームの胴部および底部の厚みが均一になるように前記二次成形体を射出成形する、［４］または［５］に記載のプリフォームの製造方法。
［７］
　外壁と、前記外壁と連なる内壁と、前記内壁と連なる内底と、を有する二重壁容器を成形するためのプリフォームの製造方法であって、前記一次成形体の前記第３の部分予定部およびその外側に形成された前記二次成形体は前記二重壁容器の前記内壁の少なくとも一部および前記外壁の少なくとも一部に対応する、［４］～［６］のいずれかに記載のプリフォームの製造方法。
［８］
　外壁と、前記外壁と連なる内壁と、前記内壁と連なる内底と、前記内壁を挟んで前記内底と反対側に設けられた開口と、を有する樹脂製の二重壁容器であって、
　前記外壁の前記開口側の部分、前記内壁および前記内底は、リサイクル材で構成される内層およびバージン材で構成される外層により構成される二層構造を備え、
　前記外壁における前記開口側の部分以外の部分は、リサイクル材で構成されており、
　前記内壁および前記内底の前記外層は、前記二重壁容器に収容される内容物が接触するように構成されている、二重壁容器。
［９］
　二重壁容器に含まれるリサイクル材の、二重壁容器に含まれるバージン材に対する重量比は２以上である、［８］に記載の二重壁容器。
［１０］
　開口部と、前記開口部と連なるネック部と、前記ネック部と連なる胴部と、前記胴部と連なる底部と、を備える樹脂製のプリフォームを延伸ブローすることにより中間成形品を成形するブロー工程と、
　前記中間成形品を押圧して、外壁と、前記外壁と連なる内壁と、前記内壁と連なる内底と、前記内壁を挟んで前記内底と反対側に設けられた開口と、を有する樹脂製の二重壁容器を成形する押圧工程と、を含む、二重壁容器の製造方法であって、
　前記中間成形品は、前記内壁に対応する内壁対応部と、前記外壁に対応する外壁対応部と、前記内底に対応する内底対応部と、を有し、
　前記内壁対応部および前記内底対応部は、前記外壁対応部から膨出するように形成され、
　前記押圧工程において、前記外壁対応部から膨出するように形成された前記内壁対応部が前記外壁対応部の内側まで反転するように、前記内底対応部を押圧することで前記二重壁容器を成形し、
　前記プリフォームの前記胴部は、前記ネック部側の第１の部分、前記底部側の第２の部分および前記第１の部分と前記第２の部分との間の第３の部分を備え、
　　前記ネック部および前記胴部の前記第１の部分は、リサイクル材で構成され、
　　前記胴部の前記第２の部分および前記第３の部分並びに前記底部は、リサイクル材で構成される内層およびバージン材で構成される外層により構成される二層構造を備える、二重壁容器の製造方法。
［１１］
　前記第３の部分は前記二重壁容器の前記内壁の少なくとも一部および前記外壁の少なくとも一部に対応する、［１０］に記載の二重壁容器の製造方法。 Hereinafter, embodiments extracted from the above-described embodiments and modifications thereof will be listed.
[1]
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.
[2]
The preform according to [1], wherein the weight ratio of the recycled material contained in the preform to the virgin material contained in the preform is 2 or more.
[3]
A preform for molding a double-walled container having an outer wall, an inner wall connected to the outer wall, and an inner bottom connected to the inner wall, and the third portion is the inner wall of the double-walled container. The preform according to [1] or [2], which corresponds to at least a part and at least a part of the outer wall.
[4]
The first step of injecting recycled material into the first mold to inject and mold the primary molded body,
A resin containing the primary molded body and the secondary molded body, which comprises a second step of accommodating the primary molded body in a second mold, injecting a virgin material, and injection molding the secondary molded body. It is a manufacturing method of preform made of
The primary molded body that is injection-molded in the first step includes an opening, a neck portion that connects to the opening, a body portion that connects to the neck portion, and a bottom portion that connects to the body portion.
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. With a partial schedule
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.
[6]
The method for producing a preform according to [4] or [5], wherein in the second step, the secondary molded body is injection-molded so that the thickness of the body and bottom of the preform is uniform.
[7]
A method for manufacturing a preform for molding a double-walled container having an outer wall, an inner wall connected to the outer wall, and an inner bottom connected to the inner wall, wherein the third partial planned portion of the primary molded body is formed. The product according to any one of [4] to [6], wherein the secondary molded product formed on the outer side thereof corresponds to at least a part of the inner wall and at least a part of the outer wall of the double-walled container. Remodeling manufacturing method.
[8]
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 double-walled container in which the inner wall and the outer layer of the inner bottom are configured to come into contact with the contents contained in the double-walled container.
[9]
The double-walled container according to [8], wherein the weight ratio of the recycled material contained in the double-walled container to the virgin material contained in the double-walled container is 2 or more.
[10]
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. Process and
Made of resin by pressing the intermediate molded product to have 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. 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.
In the pressing step, 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. Molded,
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. Production method.
[11]
The method for producing a double-walled container according to [10], wherein the third portion corresponds to at least a part of the inner wall of the double-walled container and at least a part of the outer wall.
　本発明を特定の態様を参照して詳細に説明したが、本発明の精神と範囲を離れることなく様々な変更および修正が可能であることは、当業者にとって明らかである。
　なお、本願は、２０１９年６月２８日付で出願された日本国特許出願（特願２０１９－１２１１２２）に基づいており、その全体が引用により援用される。また、ここに引用されるすべての参照は全体として取り込まれる。 Although the present invention has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that various modifications and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application (Japanese Patent Application No. 2019-121122) filed on June 28, 2019, and the entire application is incorporated by reference. Also, all references cited here are taken in as a whole.
１０：プリフォーム、１２：開口部、１４：ネック部、１６：胴部、１６ａ：第１の部分、１６ｂ：第２の部分、１６ｃ：第３の部分、１８：底部、２２：内層、２４：外層、３０：二重壁容器、３２：外壁、３４：内壁、３６：内底、３８：開口、４２：内層、４４：外層、５０：第１の金型、５２：第１のキャビティ型、５４：第１の射出コア型、５６：ネック型、５８：第１のゲート、６０：一次成形体、７０：第２の金型、７２：第２のキャビティ型、７４：第２の射出コア型、７８：第２のゲート、８０：二次成形体、９０：ブロー成形ユニット、１００：中間成形品 10: Preform, 12: Opening, 14: Neck, 16: Body, 16a: First part, 16b: Second part, 16c: Third part, 18: Bottom, 22: Inner layer, 24 : Outer layer, 30: Double wall container, 32: Outer wall, 34: Inner wall, 36: Inner bottom, 38: Opening, 42: Inner layer, 44: Outer layer, 50: First mold, 52: First cavity mold , 54: 1st injection core mold, 56: neck mold, 58: 1st gate, 60: primary molding, 70: 2nd mold, 72: 2nd cavity mold, 74: 2nd injection Core mold, 78: 2nd gate, 80: Secondary molded product, 90: Blow molding unit, 100: Intermediate molded product

Claims (6)

  1. 　第１の金型にリサイクル材を射出し一次成形体を射出成形する第１の工程と、
    　第２の金型に前記一次成形体を収容して、バージン材を射出し二次成形体を射出成形する第２の工程と、を含む、前記一次成形体および前記二次成形体を含む樹脂製のプリフォームの製造方法であって、
    　前記第１の工程において射出成形される前記一次成形体は、開口部と、前記開口部と連なるネック部と、前記ネック部と連なる胴部と、前記胴部と連なる底部と、を備え、
    　　前記胴部は、前記ネック部側の第１の部分予定部、前記底部側の第２の部分予定部および前記第１の部分予定部と前記第２の部分予定部との間の第３の部分予定部を備え、
    　　前記胴部の前記第２の部分予定部および前記第３の部分予定部並びに前記底部の厚みは、前記第１の部分予定部の厚みよりも薄く、
    　前記第２の工程において射出成形される前記二次成形体は、前記一次成形体の前記胴部の前記第２の部分予定部および前記第３の部分予定部並びに前記底部の外側に形成される、プリフォームの製造方法。     The first step of injecting recycled material into the first mold to inject and mold the primary molded body,
    A resin containing the primary molded body and the secondary molded body, which comprises a second step of accommodating the primary molded body in a second mold, injecting a virgin material, and injection molding the secondary molded body. It is a manufacturing method of preform made of
    The primary molded body that is injection-molded in the first step includes an opening, a neck portion that connects to the opening, a body portion that connects to the neck portion, and a bottom portion that connects to the body portion.
    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. With a partial schedule
    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.
  2. 　前記第１の工程で射出される前記リサイクル材の、前記第２の工程で射出される前記バージン材に対する重量比は２以上である、請求項１に記載のプリフォームの製造方法。 The method for producing a preform according to claim 1, 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.
  3. 　外壁と、前記外壁と連なる内壁と、前記内壁と連なる内底と、を有する二重壁容器を成形するためのプリフォームの製造方法であって、前記一次成形体の前記第３の部分予定部およびその外側に形成された前記二次成形体は前記二重壁容器の前記内壁の少なくとも一部および前記外壁の少なくとも一部に対応する、請求項１または請求項２に記載のプリフォームの製造方法。 A method for manufacturing a preform for molding a double-walled container having an outer wall, an inner wall connected to the outer wall, and an inner bottom connected to the inner wall, wherein the third partial planned portion of the primary molded body is formed. The production of the preform according to claim 1 or 2, wherein the secondary molded product formed on the outside thereof corresponds to at least a part of the inner wall of the double-walled container and at least a part of the outer wall. Method.
  4. 　外壁と、前記外壁と連なる内壁と、前記内壁と連なる内底と、前記内壁を挟んで前記内底と反対側に設けられた開口と、を有する樹脂製の二重壁容器であって、
    　前記外壁の前記開口側の部分、前記内壁および前記内底は、リサイクル材で構成される内層およびバージン材で構成される外層により構成される二層構造を備え、
    　前記外壁における前記開口側の部分以外の部分は、リサイクル材で構成されており、
    　前記内壁および前記内底の前記外層は、前記二重壁容器に収容される内容物が接触するように構成されている、二重壁容器。     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 double-walled container in which the inner wall and the outer layer of the inner bottom are configured to come into contact with the contents contained in the double-walled container.
  5. 　二重壁容器に含まれるリサイクル材の、二重壁容器に含まれるバージン材に対する重量比は２以上である、請求項４に記載の二重壁容器。 The double-walled container according to claim 4, wherein the weight ratio of the recycled material contained in the double-walled container to the virgin material contained in the double-walled container is 2 or more.
  6. 　開口部と、前記開口部と連なるネック部と、前記ネック部と連なる胴部と、前記胴部と連なる底部と、を備える樹脂製のプリフォームを延伸ブローすることにより中間成形品を成形するブロー工程と、
    　前記中間成形品を押圧して、外壁と、前記外壁と連なる内壁と、前記内壁と連なる内底と、前記内壁を挟んで前記内底と反対側に設けられた開口と、を有する樹脂製の二重壁容器を成形する押圧工程と、を含む、二重壁容器の製造方法であって、
    　前記中間成形品は、前記内壁に対応する内壁対応部と、前記外壁に対応する外壁対応部と、前記内底に対応する内底対応部と、を有し、
    　前記内壁対応部および前記内底対応部は、前記外壁対応部から膨出するように形成され、
    　前記押圧工程において、前記外壁対応部から膨出するように形成された前記内壁対応部が前記外壁対応部の内側まで反転するように、前記内底対応部を押圧することで前記二重壁容器を成形し、
    　前記プリフォームの前記胴部は、前記ネック部側の第１の部分、前記底部側の第２の部分および前記第１の部分と前記第２の部分との間の第３の部分を備え、
    　　前記ネック部および前記胴部の前記第１の部分は、リサイクル材で構成され、
    　　前記胴部の前記第２の部分および前記第３の部分並びに前記底部は、リサイクル材で構成される内層およびバージン材で構成される外層により構成される二層構造を備える、二重壁容器の製造方法。     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. Process and
    Made of resin by pressing the intermediate molded product to have 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. 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.
    In the pressing step, 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. Molded,
    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. Production method.
PCT/JP2020/025330 2019-06-28 2020-06-26 Method for manufacturing preform, double-wall container, and method for manufacturing double-wall container WO2020262644A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003312721A (en) * 2002-04-23 2003-11-06 Toyo Seikan Kaisha Ltd Multi-layer plastic container
JP2005205906A (en) * 2003-12-26 2005-08-04 Toyobo Co Ltd Heat shrinking polyester film and heat shrinking label

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003312721A (en) * 2002-04-23 2003-11-06 Toyo Seikan Kaisha Ltd Multi-layer plastic container
JP2005205906A (en) * 2003-12-26 2005-08-04 Toyobo Co Ltd Heat shrinking polyester film and heat shrinking label

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