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CN-122029109-A - Double container, method for producing same, and pump type double container

CN122029109ACN 122029109 ACN122029109 ACN 122029109ACN-122029109-A

Abstract

Provided is a double container having improved impact resistance. According to the present invention, there is provided a double-layered container comprising a container body including an inner bag and a casing disposed so as to cover the inner bag, wherein the inner bag includes a1 st tube disposed in the casing and a2 nd tube having an outer diameter larger than the 1 st tube and disposed at a position closer to an opening end of the inner bag than the 1 st tube, the 2 nd tube includes a peripheral wall and a lower wall disposed below the peripheral wall and configured so that the peripheral wall is reduced in diameter toward the 1 st tube, and the inner bag is disposed so that the lower wall is in contact with the casing. The container of the present invention is excellent in recyclability, and therefore can be suitably used for producing recycled materials.

Inventors

  • Yoshida Kiichiro
  • Kajimoto Kingo
  • Mi Qiudaier
  • Mori Koshun

Assignees

  • 京洛株式会社

Dates

Publication Date
20260512
Application Date
20241011
Priority Date
20231017

Claims (20)

  1. 1. A double-layered container comprising a container body, The container body is provided with an inner bag and a housing arranged to cover the inner bag, The inner bag comprises a 1 st cylinder arranged in the outer shell and a2 nd cylinder with the outer diameter larger than the 1 st cylinder and arranged at a position closer to the opening end of the inner bag than the 1 st cylinder, The 2 nd cylinder is provided with a peripheral wall and a lower wall which is arranged at the lower side of the peripheral wall and is configured to enable the peripheral wall to shrink towards the 1 st cylinder, The inner bag is configured such that the lower wall abuts the outer shell.
  2. 2. The double container according to claim 1, wherein, A part or all of the side of the peripheral wall, which is close to the lower wall, is covered by the housing.
  3. 3. The double container according to claim 1, wherein, The angle of the peripheral wall with respect to the lower wall is 90 degrees or more.
  4. 4. The double container according to claim 1, wherein, The inner bag is provided with an engaging portion capable of engaging with the mouth mounting member at a protruding portion protruding from the opening end of the outer case, In the peripheral wall, a length between a lower surface of the lower wall and a lower surface of the engagement portion is 2mm or more.
  5. 5. The double container according to any one of claims 1 to 4, wherein, The double container includes a mouth part mounting member mounted on the mouth part of the container main body, The mouth part mounting member is provided with an outer cylinder, The opening end of the outer shell is provided with a basal surface opposite to the opening end of the outer cylinder and an annular convex part protruding from the basal surface, The annular projection projects toward the inside of the outer tube.
  6. 6. The double container according to claim 5, wherein, The apex of the annular convex part is higher than the opening end of the outer cylinder.
  7. 7. A double-layered container comprising a container body and a mouth part attachment member attached to the mouth part of the container body, The container body is provided with an inner bag and a housing arranged to cover the inner bag, The inner bag is provided with an engaging portion capable of engaging with the mouth mounting member at a protruding portion protruding from the opening end of the outer case, If the direction in which the central axis of the mouth portion of the container body extends is defined as the axial direction, In the axial direction, the length between the opening end of the inner bag and the lower surface of the clamping part is 4.0-5.0 mm.
  8. 8. The double container according to claim 7, wherein, The inner surface of the clamping part is provided with a concave part.
  9. 9. The double container according to claim 7, wherein, The inner bag is provided with an inclined surface and a sealing cylinder part in sequence at the side closer to the opening end than the lower surface, The inner surface of the sealing cylinder is tightly attached to the outer peripheral surface of the inner cylinder provided on the mouth mounting member, The inclined surface is configured to reduce the diameter of the engagement portion toward the seal cylinder portion, The length between the lower end of the sealing cylinder part and the lower surface of the clamping part is 1.2-4.0 mm.
  10. 10. The double container according to any one of claims 7 to 9, wherein, The inner bag is provided with a sealing cylinder part at the side closer to the opening end than the lower surface, The inner surface of the sealing cylinder is tightly attached to the outer peripheral surface of the inner cylinder provided on the mouth mounting member, If the direction in which the central axis of the mouth portion of the container body extends is defined as the axial direction, In the axial direction, the length between the opening end and the lower end of the sealing cylinder part is 0.5-3.3 mm.
  11. 11. A double-layered container comprising a container body, The container body is provided with an inner bag and a housing arranged to cover the inner bag, The inner bag and the outer shell are provided with a cam mechanism which moves the inner bag in a direction of being pulled out from the container main body by the rotation of the inner bag relative to the outer shell, The outer peripheral surface of the housing is provided with a1 st and a2 nd flange parts in sequence from the opening end side of the housing, The cam mechanism is configured such that a lower end of the cam mechanism is located closer to the open end than a lower surface of the 2 nd flange portion.
  12. 12. The double container according to claim 11, wherein, The 1 st flange portion is formed by expanding the diameter of the open end.
  13. 13. The double container according to claim 11 or 12, wherein, The double container includes a mouth part mounting member mounted on the mouth part of the container main body, The 1 st flange portion is not engaged with the mouth mounting member.
  14. 14. A double-layered container comprising a container body and a mouth attachment member attached to the mouth of the container body, The container body is provided with an inner bag and a housing arranged to cover the inner bag, The inner bag is provided with a protruding part protruding from the opening end of the outer shell, The protruding part is provided with an engaging part which can be engaged with the mouth mounting member, The engagement portion abuts against the housing.
  15. 15. The double container according to claim 14, wherein, The inner peripheral surface of the engaging portion is provided with a recess.
  16. 16. The double container according to claim 14, wherein, The inner bag is provided with a sealing cylinder part at a position closer to the opening end of the inner bag than the clamping part, The engagement portion includes an inclined wall configured to reduce the diameter of the engagement portion toward the seal cylinder portion, The inner surface of the seal cylinder is tightly attached to the outer peripheral surface of the inner cylinder provided on the mouth mounting member.
  17. 17. The double container according to claim 14, wherein, The housing has a flange portion at an opening end of the housing, The flange portion is in contact with the engagement portion.
  18. 18. A method for producing a double container, wherein the double container is a double container according to any one of claim 14 to claim 17, The manufacturing method comprises a step of manufacturing the container body by biaxially stretching and blow molding a preform, The preform having an inner preform that becomes the inner bag and an outer preform that becomes the outer shell, The inner preform is formed by direct blow molding.
  19. 19. A double container comprising a container body, an adapter, and a discharge member, The container body is provided with an inner bag and a housing arranged to cover the inner bag, The discharge member has a discharge port for discharging the contents of the inner bag, The adapter is configured to be engageable with both the container body and the discharge member.
  20. 20. The double container according to claim 19, wherein, The discharge member is a cap provided with a cap main body and an outer cap, The cover body is configured to be capable of being engaged with the adapter and is provided with the discharge port, The outer cover is configured to be capable of opening and closing the discharge port.

Description

Double container, method for producing same, and pump type double container Technical Field The present invention relates to a double container, a method for producing the same, and a pump type double container. Background (1 St to 3 rd and 5 th aspects) Conventionally, a double container including a container body having a case and an inner bag is known. For example, patent document 1 discloses a method for manufacturing a container body, which comprises biaxially stretching and blow molding a preform comprising an inner preform and an outer preform, thereby manufacturing a container body having an inner bag and an outer shell covering the inner bag. (1 St to 2 nd aspect) In the container body of patent document 1, the inner bag includes a projection projecting from the open end of the outer case, and an abutment flange for abutting against the open end of the outer case is provided on the projection. (Aspect 3) In the structure of patent document 1, the discharge member attached to the mouth of the container body includes a main body portion and a band portion, and the band portion engaged with the outer case is removed, so that the main body portion engaged with the inner bag can be rotated together with the inner bag to pull out the inner bag. (Aspect 4) Conventionally, a double container including a container body having a case and an inner bag is known. For example, patent document 2 discloses a double container formed by biaxial stretch blow molding in a state where a case preform and an inner bag preform are laminated. (Aspect 5) In the structure of patent document 1, the mouth attachment member attached to the mouth of the container body is engaged with the inner bag, and the mouth attachment member can be rotated together with the inner bag to pull out the inner bag. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2023-26868 Patent document 2 Japanese patent application laid-open No. 2019-10741 Disclosure of Invention Problems to be solved by the invention (Aspect 1) As a result of conducting a drop test at a low temperature for a double container having a container body having the same constitution as that of patent document 1, the present inventors found that when an inner preform is molded by direct blow molding, the inner bag is liable to break at the abutment flange. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a double container having improved impact resistance. (Aspect 2) In patent document 1, the mouth attachment member is engaged with an engagement projection provided on the inner bag, and the inner bag is pulled out by pulling the mouth attachment member. Further, a seal structure is employed in which the outer peripheral surface of the inner tube provided on the mouth mounting member is brought into close contact with the inner peripheral surface of the inner bag. In patent document 1, the engagement convex portion of the inner bag is provided at the opening end of the inner bag, and the seal structure is formed at a portion where the engagement convex portion is provided. The shape of the inner peripheral surface of the inner preform does not reflect the shape of the outer peripheral surface when the inner preform is formed by injection molding, and thus the above-described sealing structure can be adopted, but when the inner preform is formed by direct blow molding, the shape of the inner peripheral surface of the inner preform reflects the shape of the outer peripheral surface, and thus a concave portion reflecting the shape of the outer peripheral surface of the engaging convex portion is formed on the inner peripheral surface of the engaging convex portion, and thus the above-described sealing structure is difficult to adopt. When the inner preform is formed by direct blow molding, it is conceivable to provide a portion capable of forming the seal structure on the side closer to the opening end than the engaging convex portion, but this may cause a problem that the protruding amount of the protruding portion becomes excessively large, and the degree of freedom of selecting the mouth attachment member is easily lowered. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a double container capable of reducing the protrusion amount of an inner bag from an open end of a housing. (Aspect 3) Further, in the double container in which the inner bag is pulled out from the container body as in patent document 1, the shape of the engaging portion provided at the mouth of the double container may be special, or the outer diameter of the mouth may be larger than that of a general container such as a PET bottle, and in this case, a cap of a standard product cannot be used, and it is necessary to develop the cap by itself. However, self-developing the cap can easily lead to problems of both dev