Multiple layer sheet materials, and packages, and methods and ap

Details Multiple layer sheet materials, and packages, and methods and ap Multiple layer sheet materials, and packages, and methods and ap

1989-12-28

1993-08-17

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling rate of movement of molding material or its...

264171, 4251311, 4251335, 425462, B29C 4706

Patent

active

052366421

ABSTRACT:
Method, apparatus, and films, related to coextrusion of heat-sensitive polymer materials. The sensitive melt stream element (12) is encapsulated in a second polymeric melt stream element (16). Transport means (36) is preferably employed between the encapsulating means (20) and the die (42). A third melt stream element (68) is joined to one or both opposing surfaces (70) of the second melt stream element (16) between the encapsulating means (20) and the die (42). In the die (42) the encapsulated melt stream element (12) becomes an interior layer (46) between encapsulating layers (48A, 48B) derived from the second melt stream element (16). The third melt stream element (68) forms layers (72, 74) positioned outwardly of the encapsulating layers (48A, 48B). The positioning, on the interior of the extrudate, of edges (54) of layer (46) is adjusterd independently of the combined thicknesses of a layer derived from the third melt stream element (68) and an adjacent layer (48).

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