Method for manufacturing packaging materials with a polyolefin foam layer
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United States of America Patent
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Sep 21, 2004
Grant Date -
N/A
app pub date -
Jan 4, 2000
filing date -
Feb 17, 1995
priority date (Note) -
Expired
status (Latency Note)
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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 (30) 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 (14) and the further bonding layer (30) 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).
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