WO2022074885A1 - Préforme et récipient en résine synthétique et procédé pour sa fabrication - Google Patents

Préforme et récipient en résine synthétique et procédé pour sa fabrication Download PDF

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Publication number
WO2022074885A1
WO2022074885A1 PCT/JP2021/025425 JP2021025425W WO2022074885A1 WO 2022074885 A1 WO2022074885 A1 WO 2022074885A1 JP 2021025425 W JP2021025425 W JP 2021025425W WO 2022074885 A1 WO2022074885 A1 WO 2022074885A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
preform
coating layer
synthetic resin
partially
Prior art date
Application number
PCT/JP2021/025425
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English (en)
Japanese (ja)
Inventor
弘光 清都
祐一 宮崎
洋一 田所
温 小宮
Original Assignee
東洋製罐株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 東洋製罐株式会社 filed Critical 東洋製罐株式会社
Publication of WO2022074885A1 publication Critical patent/WO2022074885A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—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
    • 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
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • 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

Definitions

  • the present invention relates to a preform, a container made of synthetic resin, and a method for manufacturing the same.
  • the preform in which a coating material layer is laminated on the outer peripheral surface side of the preform body, and a coating layer on the outer peripheral surface side of the container body.
  • the present invention relates to a synthetic resin container in which is laminated and a method for manufacturing the same.
  • a container made of synthetic resin in which a bottomed tubular preform is formed using a thermoplastic resin such as polyethylene terephthalate, and then this preform is molded into a bottle shape by biaxial stretch blow molding or the like, is used. It is used in a wide range of fields as a container containing various beverages and various seasonings.
  • This type of container is filled and sealed with its contents, and is usually put on the market with a label printed with its product name, contents display, and decorative design.
  • a label a shrink label attached by heat shrinkage, a seal label attached by an adhesive, and the like are known (see, for example, Patent Document 1).
  • the present inventors have completed the present invention as a result of repeated studies in order to provide a container made of synthetic resin having design features, which is not found in the container with the conventional label.
  • the preform according to the present invention is a preform for manufacturing a synthetic resin container by blow molding, and is laminated on a bottomed cylindrical preform main body having an opening on one end side and an outer peripheral surface side of the preform main body.
  • the covering material layer is provided with at least one of a thick portion having a partially thickened portion, a thin portion having a partially thinned portion, and a partially defective portion. It is a configuration that includes one.
  • the method for manufacturing a synthetic resin container according to the present invention is a method for manufacturing a synthetic resin container including a container body formed into a predetermined container shape and a coating layer laminated on the outer peripheral surface side of the container body.
  • the preform is blow-molded, and the thickness distribution of the coating material layer by at least one of the thick portion, the thin portion, or the defect portion is changed to the thickness distribution of the coating layer. There is a way to reflect it.
  • the synthetic resin container according to the present invention is a synthetic resin container provided with a container body formed into a predetermined container shape and a coating layer laminated on the outer peripheral surface side of the container body, and the coating is provided.
  • the layer is configured to include at least one of a partially thickened portion, a partially thinned portion, and a partially defective portion.
  • FIG. 1 is an end view taken along the line AA of FIG. It is explanatory drawing which shows the outline of the synthetic resin container which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the outline of the molding process of the preform which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the end face corresponding to AA end face of FIG. 1 about the modification of the preform which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the outline of the preform which concerns on 2nd Embodiment of this invention.
  • FIG. 1 is an explanatory view showing an outline of a preform according to the present embodiment
  • FIG. 2 is an end view taken along the line AA of FIG.
  • the preform 1 shown in these figures is for manufacturing a container 10 described later by blow molding, in which a mouth portion 2 is formed on one end side of a cylindrical body portion 4 and a hemispherical shape is formed on the other end side. It includes a bottomed tubular preform main body 1a having a bottom portion 5 formed and one end open, and a covering material layer 6 laminated on the outer peripheral surface side of the preform main body 1a.
  • FIG. 1 shows a vertical cross section of the preform 1 in which a part of the upper end side of the body 4 is cut out from the mouth 2 of the preform 1 when viewed from the front, and the preform main body 1a appearing in the cross section is covered.
  • the wall thickness of the material layer 6 is exaggerated and schematically depicted.
  • the wall thicknesses of the preform main body 1a and the covering material layer 6 appearing in the cross section are exaggerated and schematically depicted.
  • the mouth portion 2 of the preform 1 is a portion that becomes the mouth portion 20 of the container 10 as it is without being stretched by blow molding, and a screw thread 2a for attaching a cap (not shown) is provided on the outer peripheral surface of the mouth portion 2. It is provided. Further, a neck ring 2b is provided on the lower end side of the mouth portion 2 so as to project in an annular shape along the circumferential direction.
  • the preform 1 is softened by heating so that it can be blow-molded, and then set in a blow-molding mold (not shown), and the portion from directly under the neck ring 2b to the bottom 5 is stretched as necessary. While being stretched in the axial direction (longitudinal direction) by the rod, it is stretched in the axial direction and the circumferential direction (horizontal direction) by the high-pressure fluid blow. Then, the cavity shape of the blow molding mold is transferred to the stretched portion, so that the container 10 has a predetermined container shape. At this time, the container body 10a is formed by the stretched preform body 1a, and the dressing layer 6 laminated on the preform body 1a is integrally molded with the preform body 1a and laminated on the container body 10a. It is molded so as to be the coated coating layer 60.
  • the container 10 is a container formed into a predetermined container shape including a mouth portion 20, a shoulder portion 30, a body portion 40, and a bottom portion 50.
  • the main body 10a and the covering layer 60 laminated on the outer peripheral surface side of the container main body 10a are provided.
  • FIG. 3 shows a cross section of the container 10 in which a part of the upper end side of the shoulder portion 30 is cut out from the mouth portion 20 of the container 10 viewed from the front, and the container body 10a and the covering layer 60 appearing in the cross section.
  • the wall thickness is exaggerated and depicted schematically.
  • the lower end of the mouth portion 20 is connected to the shoulder portion 30 whose diameter increases toward the body portion 40.
  • the body portion 40 is a portion that occupies most of the height direction of the container 10, and the bottom portion 50 is connected to the lower end thereof.
  • the bottom portion 50 includes a ground contact portion 50a that comes into contact with the ground contact surface when the container 10 is upright, and the peripheral surface 50b of the bottom portion 50 is connected to the lower end of the body portion 40 while expanding the diameter from the ground contact portion 50a. ..
  • the height direction means a direction orthogonal to the horizontal plane when the container 10 is upright on the horizontal plane with the mouth portion 20 facing up, and the container 10 is in this state (the state shown in FIG. 3).
  • the vertical and horizontal directions and the vertical and horizontal directions of are specified. The same applies to the vertical and horizontal directions and the vertical and horizontal directions of the preform 1.
  • any blow-moldable thermoplastic resin can be used, but in consideration of recyclability, polyethylene terephthalate-based thermoplastics such as polyethylene terephthalate can be used. Polyester is preferred.
  • the resin material for forming the coating material layer 6 (coating layer 60), from the viewpoint of facilitating the work of peeling off the coating layer 60 and separating it from the container body 10a when the used container 10 is discarded. It is preferable to use a thermoplastic resin that is incompatible with the resin material that forms the reform body 1a.
  • the resin material forming the covering material layer 6 is, for example, a polyolefin-based resin such as polyethylene or polypropylene, or an ethylene-vinyl alcohol co-weight.
  • a polyamide-based resin such as a combination or a polymethoxylylene adipamide (MXD6) can be used.
  • additives such as pigments and colorants are added to the resin material forming the coating material layer 6 as necessary without being limited by the recyclability required for the container body 10a. Can be done.
  • the preform 1 in which the covering material layer 6 is laminated on the outer peripheral surface side of the preform main body 1a is molded as follows by, for example, an injection molding method called two-color molding or double molding. can do.
  • a core mold 100 that forms the inner peripheral surface of the preform main body 1a and the upper end surface of the mouth portion 2 thereof, and a mouth portion type 101 that forms the outer peripheral surface of the mouth portion 2 including the upper surface and the peripheral end surface of the neck ring 2b.
  • the first body mold 102 that forms the outer peripheral surface of the preform main body 1a from the lower surface to the bottom 5 of the neck ring 2b is molded, and the preform main body 1a is injection-molded (FIG. 4A). reference).
  • a second body type 103 configured to form a gap for forming the covering material layer 6 with the molded preform main body 1a is used.
  • the covering material layer 6 is formed on the outer peripheral surface side of the preform main body 1a.
  • the laminated preform 1 can be molded.
  • the first and second body types 102 and 103 are usually provided with a gate serving as an injection port for the resin material on the bottom 5 side of the preform 1, but in the example shown in FIG. 4, the gate is arranged.
  • the illustration of the gate is omitted.
  • the first and second body molds 102 and 103 are provided with a split mold structure that opens in a direction orthogonal to the axial direction, if necessary, so as not to hinder the mold opening. Needless to say, it can be.
  • the covering material layer 6 covers the entire surface from the bottom portion 5 to directly below the mouth portion 2, and the end side thereof is a neck ring provided on the lower end side of the mouth portion 2. It is preferable that the preform main body 1a is laminated on the outer peripheral surface side so as to reach the peripheral edge of the neck ring 2b while covering the lower surface of the 2b.
  • the container 10 is provided with the terminal side of the covering material layer 6 covering the lower surface of the neck ring 2b as it is. It is on the terminal side of the coating layer 60. Therefore, when the used container 10 is discarded, the end side of the coating layer 60 is separated from the neck ring 2b by hanging a finger on the end of the coating layer 60 reaching the peripheral edge of the neck ring 2b. By picking the separated end side with a finger and peeling the coating layer 60 from the container body 10a, the container body 10a and the coating layer 60 can be easily separated.
  • such an embodiment is particularly preferable when it is required to color the coating layer 60 to impart light-shielding property in order to suppress deterioration of the contents due to light.
  • the covering material layer 6 laminated on the outer peripheral surface side of the preform main body 1a is molded so as to include the thick portion 6a which is partially thickened, and is shown in FIGS. 1 and 2.
  • eight thick portions 6a extending along the axial direction are arranged in a vertical stripe pattern.
  • the covering material layer 6 is integrally molded with the preform main body 1a to become the covering layer 60.
  • the wall thickness distribution of the material layer 6 is reflected in the wall thickness distribution of the covering layer 60.
  • the thick portion 60a derived from the thick portion 6a of the covering material layer 6 is formed in the covering layer 60.
  • eight thick portions 60a derived from the thick portion 6a of the covering material layer 6 are arranged in a vertical stripe shape on the coating layer 60 included in the container 10. It forms a striped pattern.
  • the covering material layer 6 is formed with a thick portion 6a so as to project toward the surface side of the covering material layer 6, but the covering material layer is formed.
  • the thickness distribution of 6 is not limited to this as long as it can be reflected in the wall thickness distribution of the coating layer 60 included in the blow-molded container 10.
  • a recess may be provided in the preform main body 1a, and the recess may be filled with a resin material forming the covering material layer 6 to form a thick portion 60a. ..
  • FIG. 6 is an explanatory view showing an outline of the preform according to the present embodiment, and the right half of the preform 1 viewed from the front is cut out to show a vertical cross section thereof, but the preform appearing in the cross section is shown.
  • the wall thickness of the main body 1a and the covering material layer 6 is exaggerated and schematically depicted.
  • the preform 1 has a mouth portion 2 formed on one end side of a cylindrical body portion 4 and a hemispherical bottom portion 5 formed on the other end side, and one end thereof is open. It includes a bottomed tubular preform main body 1a and a covering material layer 6 laminated on the outer peripheral surface side of the preform main body 1a.
  • FIG. 7 shows an example of a container 10 obtained by blow-molding the preform 1 shown in FIG. 6, and the right half of the container 10 in the front view is cut out to show a vertical cross section thereof.
  • the wall thickness of the container body 10a and the coating layer 60 appearing in the cross section is exaggerated and schematically depicted.
  • the container 10 has a container body 10a formed into a predetermined container shape including a mouth portion 20, a shoulder portion 30, a body portion 40, and a bottom portion 50, and an outer peripheral surface of the container body 10a. It is provided with a coating layer 60 laminated on the side.
  • the covering material layer 6 laminated on the outer peripheral surface side of the preform main body 1a is formed so as to include the thick portion 6a which is partially thickened.
  • two thick portions 6a extending along the circumferential direction are arranged on the upper end side and the lower end side of the body portion 4, respectively.
  • the shoulder portion 30 is provided in the coating layer 60 included in the blow molded container 10.
  • the thick portion 60a is set to be arranged in an annular shape at a portion along the connection portion between the body portion 40 and the body portion 40 and a portion along the peripheral surface 50b of the bottom portion 50.
  • a portion along the joint portion between the shoulder portion 30 and the body portion 40 and the bottom portion 50 during transportation or when discharged from the vending machine are used.
  • the portion along the peripheral surface 50b is easily damaged, and the coating layer 60 may be damaged.
  • the thick portion 60a by disposing the thick portion 60a in these portions, the weight increase due to the formation of the entire coating layer 60 in the thick thickness is avoided, and the damage is avoided. It is also possible to selectively improve the strength of the susceptible portion. Further, by disposing the thick portion 60a on the covering layer 60 provided in the container 10, it is possible to impart design features that have not been seen in the past.
  • the thick portion 6a in the covering material layer 6 of the preform 1 is arranged at a portion where the container 10 is easily damaged according to the container shape of the container 10 obtained by blow molding the preform 1.
  • the point that the thick portion 60a is set to be arranged is different from the first embodiment described above, but since the other configurations are the same as those of the first embodiment described above, overlapping description will be omitted.
  • FIG. 8 is an explanatory view showing an outline of the preform according to the present embodiment
  • FIG. 9 is an end view of BB of FIG.
  • FIG. 8 shows a vertical cross section of the preform 1 seen from the front by cutting out a part of the upper end side of the body 4 from the mouth portion 2, but the preform main body 1a appearing in the cross section is covered.
  • the wall thickness of the material layer 6 is exaggerated and schematically depicted.
  • the wall thicknesses of the preform main body 1a and the covering material layer 6 appearing in the cross section are exaggerated and schematically depicted.
  • the preform 1 has a mouth portion 2 formed on one end side of a cylindrical body portion 4 and a hemispherical bottom portion 5 formed on the other end side, and one end thereof is open. It includes a bottomed tubular preform main body 1a and a covering material layer 6 laminated on the outer peripheral surface side of the preform main body 1a.
  • FIG. 10 shows an example of a container 10 obtained by blow-molding the preform 1 shown in FIGS. 8 and 9, and is a part of the upper end side of the shoulder portion 30 from the mouth portion 20 of the container 10 viewed from the front. Is cut out to show the cross section, but the thickness of the container body 10a and the coating layer 60 appearing in the cross section is exaggerated and schematically depicted.
  • the container 10 has a container body 10a formed into a predetermined container shape including a mouth portion 20, a shoulder portion 30, a body portion 40, and a bottom portion 50, and an outer peripheral surface of the container body 10a. It is provided with a coating layer 60 laminated on the side.
  • the dressing layer 6 laminated on the outer peripheral surface side of the preform main body 1a is molded so as to include the defective portion 6b in which the dressing layer 6 is partially defective, and is shown in FIGS. 8 and 9.
  • the defect portion 6b extending narrowly along the axial direction is arranged in a range extending from the upper end side to the bottom portion 5 side of the body portion 4.
  • the figure is shown in the container 10 blow-molded using the preform 1 provided with such a covering material layer 6, when the covering material layer 6 is integrally molded with the preform main body 1a to become the covering layer 60, the figure is shown. As shown in 10, the defect portion 60b derived from the defect portion 6b of the coating material layer 6 is formed in the coating layer 60.
  • the defective portion 60b is narrowly arranged in the covering layer 60 included in the container 10 in the range from the upper end side of the shoulder portion 30 to the bottom portion 50.
  • the coating layer 60 provided in the container 10 is formed with a defective portion 60b in which the coating layer 60 is partially defective, so that deterioration of the contents due to light is suppressed. Even when the 60 is colored to impart a light-shielding property, the liquid level of the content liquid in the container 10 can be visually recognized through the defective portion 60b. Further, by disposing the defective portion 60b on the covering layer 60 provided in the container 10, it is possible to impart design features that have not been seen in the past.
  • the covering material layer 6 is laminated on the outer peripheral surface side of the preform main body 1a so as to include the partially defective defective portion 6b, and the defective portion 60b derived from the defective portion 6b is the preform 1. It is different from the above-mentioned first embodiment in that it is formed into the coating layer 60 provided in the container 10 which is blow-molded. The explanation to be given is omitted.
  • a striped pattern formed by arranging thick portions 60a in a vertical stripe pattern on the coating layer 60 provided in the container 10 is shown, but it is formed on the coating layer 60.
  • the pattern is not limited to this. It may be a pattern consisting of figures, characters, various decorative patterns, combinations thereof, and the like. Further, the pattern formed on the coating layer 60 is not limited to the thick portion 60a that is partially thickened, and the coating layer 60 is partially deleted as shown in the above-mentioned third embodiment. It may be a defective portion 60b that has been made to be formed, or may be a thin portion in which the coating layer 60 is partially thinned, although not particularly shown.
  • a pattern formed by at least one of these or a combination thereof can be formed on the coating layer 60 provided in the container 10.
  • the covering layer 60 included in the container 10 has both a portion along the connecting portion between the shoulder portion 30 and the body portion 40 and a portion along the peripheral surface 50b of the bottom portion 50.
  • the thick portion 60a is arranged, but the present invention is not limited to this. If necessary, it may be either a portion along the joint portion between the shoulder portion 30 and the body portion 40 or a portion along the peripheral surface 50b of the bottom portion 50, and the container 10 is physically or chemically damaged.
  • the wall thickness distribution of the covering material layer 6 of the preform 1 is appropriately adjusted so that the thick portion 60a is arranged in the portion so that the strength of the susceptible portion can be selectively improved. can do.
  • At least one of the thick-walled portion, the thin-walled portion, or the defective portion, or a combination thereof is used. May be formed on the coating layer 60 provided in the container 10.
  • a container 10 formed into a container shape which is a so-called round bottle, is shown, but the present invention is not limited thereto. It may be a container shape called a so-called square bottle, or it may be a container shape having a bottom 50 which is a so-called petaloid shape. Further, the body portion 40 may be formed into a columnar shape, and the mouth portion 20 may be provided in the central portion on the upper surface side thereof in a container shape.
  • Preform 1a Preform body 6 Coating material layer 6a Thick part 6b Defect part 10 Container 10a Container body 20 Mouth 30 Shoulder 40 Body 50b Peripheral surface (peripheral surface of bottom) 60 Coating layer 60a Thick part 60b Defect part

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

L'invention concerne un récipient en résine synthétique présentant une caractéristique de conception non classique qui est réalisé par : moulage par soufflage d'une préforme 1 pourvue d'un corps de préforme 1a tubulaire à fond qui s'ouvre en une extrémité correspondante et une couche 6 de matériau de revêtement comprenant au moins une partie parmi une partie épaisse 6a stratifiée sur un côté de surface circonférentielle externe du corps de préforme 1a et étant partiellement épaisse, une partie mince étant partiellement mince et une partie découpée 6b étant partiellement découpée ; et la réflexion d'une distribution d'épaisseur de la couche 6 de matériau de revêtement sur une distribution d'épaisseurs d'une couche 60 de revêtement comprise dans un récipient 10 ayant été moulé par soufflage.
PCT/JP2021/025425 2020-10-07 2021-07-06 Préforme et récipient en résine synthétique et procédé pour sa fabrication WO2022074885A1 (fr)

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JP2020170086A JP2022061869A (ja) 2020-10-07 2020-10-07 プリフォーム、並びに、合成樹脂製容器及びその製造方法
JP2020-170086 2020-10-07

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WO2022074885A1 true WO2022074885A1 (fr) 2022-04-14

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1190975A (ja) * 1997-09-18 1999-04-06 Toyo Seikan Kaisha Ltd 回収ポリエステル樹脂層を有する多層プリフォームと該多層プリフォームの製造方法及びこの多層プリフォームから成形された多層容器
JP2016068476A (ja) * 2014-09-30 2016-05-09 大日本印刷株式会社 複合容器の製造方法、複合プリフォーム、複合容器および底部保護部材
JP2019131300A (ja) * 2019-04-25 2019-08-08 大日本印刷株式会社 複合容器およびその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1190975A (ja) * 1997-09-18 1999-04-06 Toyo Seikan Kaisha Ltd 回収ポリエステル樹脂層を有する多層プリフォームと該多層プリフォームの製造方法及びこの多層プリフォームから成形された多層容器
JP2016068476A (ja) * 2014-09-30 2016-05-09 大日本印刷株式会社 複合容器の製造方法、複合プリフォーム、複合容器および底部保護部材
JP2019131300A (ja) * 2019-04-25 2019-08-08 大日本印刷株式会社 複合容器およびその製造方法

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