Plastic container

• US 3,934,749 A
• Filed: 09/11/1974
• Issued: 01/27/1976
• Est. Priority Date: 09/11/1974
• Status: Expired due to Term

• Current Assignee: Polysar Plastics, Inc.
• Original Assignee: Polysar Plastics, Inc.
• Inventors: Andrulionis, Algis Steven
• Primary Examiner(s): Dixson, Jr., William T.
• Assistant Examiner(s): Pollard, Steven M.
• Application Number:
  US05/504,884
• Time in Patent Office: 503 Days
• Field of Search: 229/43, 220/9 F, 220/63 R, 220/256, 220/257, 220/258, 220/359, 220/63, 220/9
• US Class Current: 220/256.1
• CPC Class Codes: B32B 2439/40 Closed containers
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/288 comprising polyketones
• CPC Class Codes: B32B 27/302 comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
• CPC Class Codes: B32B 27/304 comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B65D 1/28 formed of laminated material
• CPC Class Codes: B65D 2251/0018 of the 43-type
• CPC Class Codes: B65D 2251/0093 Membrane
• CPC Class Codes: B65D 2577/2025 Multi-layered container, e.g. laminated, coated
• CPC Class Codes: B65D 51/20 Caps, lids, or covers co-operating with an inner closure arranged to be opened by piercing, cutting, or tearing B65D51/185 takes precedence; co-operating with an auxiliary container for additional articles or materials B65D51/28
• CPC Class Codes: B65D 77/2032 by peeling or tearing the cover from the container
• CPC Class Codes: B65D 77/208 the cover having a cap-like or plug-like shape
• CPC Class Codes: Y10S 220/902 Foam

Abstract

A covered plastic container, and a method for the manufacture thereof, is provided in which a plastic laminate cover is sealed to the walls of the container in such a manner that only the inner layer of the laminate cover is sealed to the container and that the outer layer or layers of the laminate cover are removable therefrom and thereafter usable as a press-on cover.

Claims

1. A covered plastic container comprising a body wall and closed bottom end and sealed to a rim of the upper end of the body wall a plastic laminate cover comprising an inner plastic layer sealed to said rim of said upper end of the body wall thereby forming a hermetic seal and weakly adhering to the outer surface of said inner plastic layer and at least one outer plastic layer which is separable from said inner layer, said at least one outer plastic layer being so shaped and formed as to act as a press-on lid for said container when separated from said inner plastic layer, said inner plastic layer and said at least one outer plastic layer being originally formed as a laminate cover.

2. The container of claim 1 wherein said body wall and said closed bottom end are a single layer of plastic selected from polyethylene, polypropylene, polystyrene, polyvinyl chloride and acrylonitrile-butadiene-styrene resin.

3. The container of claim 1 wherein said body wall and said closed bottom end are a laminate of two plastics selected from polyethylene-polystyrene, polyethylene-high impact polystyrene, polypropylene-polystyrene, polyvinyl chloride-polystyrene and high impact polystyrene-polystyrene.

4. The laminate cover of claim 1 in which the inner layer is selected from polyethylene, polypropylene, polyvinyl chloride and high impact polystyrene.

5. The laminate cover of claim 1 in which the at least one outer layer is selected from crystal polystyrene, high impact polystyrene and high impact polystyrene/crystal polystyrene.

6. A process for the manufacture of a plastic container equipped with a plastic laminate cover wherein the inner layer of said plastic laminate cover is sealed to a rim of the upper end of the body wall of said container by a sealing process selected from heat sealing, friction or spin welding, ultrasonic welding, heat shrinking and adhesive sealing, said plastic laminate cover comprising said inner layer sealed to a rim of said body wall thereby forming a hermetic seal and weakly adhering to said inner layer and at least one outer plastic layer which is separable from said inner layer.

7. The process of claim 6 wherein a heated or heatable element is contacted with said laminate cover and sufficient heat is applied to cause the inner layer of said laminate cover to seal to the upper end of the body wall of said container.

8. The process of claim 6 wherein said laminate cover is sealed to said body wall by friction or spin welding by causing said cover to be spun in a rotating motion while in contact with said body wall.

9. A covered plastic container comprising a body wall and closed bottom end and sealed to the upper end of the body wall a laminate cover comprising an inner plastic layer sealed to said upper end of the body wall and weakly adhering to the outer surface of said inner plastic layer an at least one outer plastic layer which is separable from said inner layer, said at least one outer plastic layer being so shaped and formed as to act as a press-on lid for said container when separated from said inner plastic layer, said inner plastic layer and said at least one outer plastic layer being originally formed as a laminate cover, and having a release agent provided between said inner layer and said at least one outer layer.