Method of making multi-layer plastic structures

Details Method of making multi-layer plastic structures Method of making multi-layer plastic structures

1984-07-16

1987-03-24

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624412, 15624422, 15624427, 428 35, B29C 4706, B32B 3130

Patent

active

046523251

ABSTRACT:
A multilayer plastics sheet destined to be formed into foodstuff containers by thermoforming has a barrier layer for low oxygen permeability, and incorporates reclaim material for providing desired mechanical properties to the sheet. The reclaim material represents 40-60% of the sheet by volume, and in order to incorporate these high reclaim levels without concomitant organoleptic problems the reclaim material is formed as a single layer adjacent what is to be the outside surface of the container. The sheet is accordingly highly asymmetric, but any substantial polymer melt instability during coextrusion tending to cause layer thickness variation and lack of visual appeal of the sheet is prevented by forming the sheet as two substantially symmetrical components which are individually and separately coextruded, and subsequently extrusion laminated together. Of the components one includes, and is symmetrical in relation to, the barrier layer, and the other likewise incorporates the reclaim layer.

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