Composite preform, method for manufacturing same, composite container, method for manufacturing said composite container, and heat shrinkable plastic member

Patent metadata

Field	Value
Publication number	US-11213992-B2
Application number	US-201716310564-A
Country	US
Kind code	B2
Filing date	Jun 16, 2017
Priority date	Jun 17, 2016
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A method for manufacturing a composite preform is provided, including preparing a preform that is formed from a plastic material, preparing a tubular heat shrinkable plastic member that is longer than the preform and has a margin for thermocompression bonding at one end, inserting the preform into the plastic member having the plastic member undergo thermal shrinkage by heating the preform and the plastic member, and bonding the margin of the plastic member by thermocompression.

First claim

The invention claimed is:

1. A method for manufacturing a composite preform, comprising:
preparing a preform formed from a plastic material and having a mouth portion, a body portion connected to the mouth portion, and a bottom portion connected to the body portion;
preparing a tubular heat shrinkable plastic member longer than the body portion and the bottom portion of the preform and having a margin for thermocompression bonding at one end;
inserting the preform into the plastic member;
having the plastic member undergo thermal shrinkage by heating the preform and the plastic member; and
bonding the margin of the plastic member by thermocompression, wherein one part of the margin is bonded to another part of the margin.

2. The method for manufacturing a composite preform according to claim 1 , wherein a first facing surface and a second facing surface disposed so as to face each other are formed at the margin and a part of the first facing surface and a part of the second facing surface are compression-bonded to each other.

3. The method for manufacturing a composite preform according to claim 2 , wherein the first facing surface and the second facing surface are compression-bonded in mutual misalignment in an axial direction of the plastic member.

4. The method for manufacturing a composite preform according to claim 1 , wherein the margin has a length of 3 mm or more.

5. The method for manufacturing a composite preform according to claim 1 , wherein the thermocompression bonding of the margin is performed by means of an instrument having a flat or uneven surface.

6. The method for manufacturing a composite preform according to claim 5 , wherein the instrument has a surface temperature of 100° C. or more and 250° C. or less.

7. The method for manufacturing a composite preform according to claim 1 , wherein a pressure during the thermocompression bonding of the margin is 50 N/cm2 or more and 1,000 N/cm2 or less.

8. The method for manufacturing a composite preform according to claim 1 , wherein the heat shrinkable plastic member has a temperature of 80° C. or more and 200° C. or less during the thermocompression bonding of the margin.

9. A method for manufacturing a composite container, the method comprising:
heating a composite preform obtained by the method according to claim 1 ; and
inserting the composite preform into a blow molding mold; and
integrally expanding attic preform and the plastic member of the composite preform by blow molding to the composite preform after the heating.

10. A composite preform comprising:
a preform having a mouth portion, a body portion connected to the mouth portion, and a bottom portion connected to the body portion; and
a heat shrinkable plastic member that is longer than the body portion and the bottom portion of the preform, the heat shrinkable plastic member having a margin for thermocompression bonding at one end, and
wherein the plastic member is provided to surround an outside of the preform, and
wherein one part of the margin of the plastic member is bonded to a another part of the margin by thermocompression.

11. The composite preform according to claim 10 , wherein a first facing surface and a second facing surface disposed so as to face each other are formed at the margin and a part of the first facing surface and a part of the second facing surface are compression-bonded to each other.

12. The composite preform according to claim 11 , wherein the first facing surface and the second facing surface are compression-bonded in mutual misalignment in an axial direction of the plastic member.

13. A composite container comprising a blow molded article of the composite preform according to claim 10 , the composite container comprising:
a container main body having a mouth portion, a body portion provided below the mouth portion, and a bottom portion provided below the body portion; and
the heat shrinkable plastic member provided in contact with an outside of the container main body,
wherein one part of the margin of the plastic member is bonded to another part of the margin by thermocompression.

14. A composite preform comprising:
a preform having a mouth portion, a body portion connected to the mouth portion, and a bottom portion connected to the body portion; and
a heat shrinkable plastic member provided to surround an outside of the preform,
wherein an end portion of the plastic member on the bottom portion side of the preform forms a compression bonding bottom portion by being compression-bonded along a shape of the bottom portion of the preform, and
wherein one part of the compression bonding bottom portion is bonded to another part of the compression bonding bottom portion.

15. A composite container comprising a blow molded article of the composite preform according to claim 14 , the composite container comprising:
a container main body having a mouth portion, a body portion provided below the mouth portion, and a bottom portion provided below the body portion;
the heat shrinkable plastic member provided in contact with an outside of the container main body,
wherein one end of the plastic member on the bottom portion side of the container main body forms a compression bonding bottom portion by being compression-bonded, and
wherein one part of the compression bonding bottom portion is bonded to another part of the compression bonding bottom portion.

16. A method for manufacturing a composite preform, the method comprising:
preparing a preform having a mouth portion, a body portion connected to the mouth portion, and a bottom portion connected to the body portion;
preparing a tubular heat shrinkable plastic member that is longer than the body portion and the bottom portion of the preform;
inserting the preform into the tubular heat shrinkable plastic member;
heating the preform and the plastic member to cause the plastic member to undergo thermal shrinkage; and
forming a compression bonding bottom portion by performing thermocompression bonding on an end portion of the plastic member on the bottom portion side of the preform along a shape of the bottom portion of the preform,
wherein one part of the compression bonding bottom portion is bonded to another part of the compression bonding bottom portion.

17. The method for manufacturing a composite preform according to claim 16 , wherein the thermocompression bonding is performed by means of an instrument having a flat or uneven surface.

18. The method for manufacturing a composite preform according to claim 17 , wherein the instrument has a surface temperature of 100° C. or more and 250° C. or less.

19. The method for manufacturing a composite preform according to claim 16 , wherein a pressure during the thermocompression bonding is 50 N/cm2 or more and 1,000 N/cm2 or less.

20. The method for manufacturing a composite preform according to claim 16 , wherein the heat shrinkable plastic member has a temperature of 80° C. or more and 200° C. or less during the thermocompression bonding.

21. The method for manufacturing a composite preform according to claim 16 , further comprising performing cutting such that a length from a vertex of the bottom portion of the preform to an endmost part of the plastic member is 0.5 mm or more and 5 mm or less.

22. The method for manufacturing a composite preform according to claim 16 , wherein a length of the plastic member exceeds a sum of lengths of the body portion and the bottom portion of the preform by 3 mm or mor

Assignees

• Dainippon Printing Co Ltd

Inventors

• Suga Yusuke
• Miyawaki Takuma
• Hirose Kazuya
• Hashimoto Daichi

Classifications

• B29C2949/0715

  the preform having one end closed · CPC title

• B29C49/04102

  extruding the material continuously · CPC title

• B29C49/22

  using multilayered preforms or parisons · CPC title

• B29C49/24 Primary

  Lining or labelling · CPC title

• B29B11/14

  characterised by structure or composition · CPC title