The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 2004
Filed:
Jan. 04, 2000
Jacques Laurent, Blonay, CH;
Michel Pittet, Billens, CH;
Convenience Food Systems, B.V., En Bakel, NL;
Abstract
The inventive method for producing packaging materials consisting of a polyolefin foam layer (B) coated with a coating film (A) on at least one side, which packaging material is formable into self supporting packaging items, such as trays, by thermoforming or folding, comprises a coextrusion step or an extrusion lamination step in which step the bonding between the polyolefin foam layer (B) and the coating is achieved. With the extrusion lamination step, the method is as follows: In a first method step, a single-layer or multi-layer coating film (A) is produced by extrusion or coextrusion, in a second method step a polyolefin foam sheet (B) is produced by expansion and extrusion and in the third method step the polyolefin foam sheet (B) is coated with the coating film (A) by extrusion lamination, wherein a polyolefin bonding layer ( ) is extruded between the foam sheet (B) and the coating film (A) and pressure is applied to the combination. At least the one surface of the coating film (A) facing the foam layer (B) consists of a polyolefin and this bonding layer ( ) and the further bonding layer ( ) extruded in the third method step consist of polyolefins based on the monomer which is the main monomer of the polyolefin of the foam layer (B).