Container consisting of a rigid outer container and a deformable inner bag and a production method thereof

By using EVOH and Surlyn mixed materials and glass beads on the outer layer of the inner bag, combined with the joint operation after the parison is expanded, the problem of adhesion between the inner bag and the outer container is solved, and the container is quickly separated and contacted and shortened. Production time.

CN115709849BActive Publication Date: 2024-12-10GAPLAST GMBH
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Patent Information

Application Number
CN202211006916.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2021-08-23
Filing Date
2022-08-22
Publication Date
2024-12-10
Estimated Expiration
2042-08-22

AI Technical Summary

Technical Problem

In the production process, existing containers composed of rigid outer containers and deformable inner bags, the problem of adhesion between the inner bag and the outer container leads to complex separation and contact steps, increasing the production time of ready-to-use containers.

Method used

By using EVOH with a rough surface with microscopic small raised and recessed in the outer layer of the inner bag, and adding glass beads of Surlyn and non-smooth surfaces during the coextrusion process, the adhesion is reduced while the modeling is in-form After the blank expands, the pinch-off joints are opened to form an air slit, allowing for slight adhesion and separation of the inner bag on the stamper.

Benefits of technology

Fast and easy separation and contact between the inner bag and the outer container is achieved, significantly shortening the production time of ready-to-use containers and allowing partial vacuum separation during discharge of the container contents.

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Abstract

The invention relates to a container consisting of a rigid outer container and a deformable inner bag and a method for producing the same. The method comprises that a first screw conveyor feeds a first thermoplastic plastic material for the outer container, at least a second and a third screw conveyor feed at least a second and a third thermoplastic plastic material for the inner bag to an extruder for co-extruding a parison consisting of at least a first, a second and a third layer, the excess material in the bottom region of the container to be produced is pinched off to form a web consisting of the material of the outer container which clamps the welded bottom seam of the inner bag, the parison is expanded by a pressure medium so that it comes into contact with the wall of a blow mold, the excess material below the weld is cut off, and the container is removed from the blow mold, the second thermoplastic plastic material forming the outer layer of the inner bag in contact with the outer container comprises a material having a rough surface with microscopically small protrusions and depressions in the hardened state, so that the adhesion between the outer container and the inner bag is minimized.
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Citation Information

Patent Citations

  • Container comprising a stiff outer section and an easily deformable inner bag, is formed by coextruding a blank, blow moulding, and applying a pressurising medium

    DE102006012487A1

  • Method for manufacturing a container and container with pressure equalization openings

    DE19626967C2

  • Container with an inner bag

    IN201834016165A

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    US20090039549A1

  • Container with an inner bag

    US20180334310A1