Apparatus for injection molding multilayered articles

Details Apparatus for injection molding multilayered articles Apparatus for injection molding multilayered articles

2006-02-28

2006-02-28

Smith, Duane (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

C425S133500, C425S204000

Reexamination Certificate

active

07004739

ABSTRACT:
An apparatus for injection molding two compatible polymeric materials, in which two or more plasticizing zones on a screw are used to simultaneously or sequentially plasticize the two materials into a common accumulation space through separate pathways. The charge comprising multiple layers of material is then injected into a closed mold by means of forward axial motion of the screw with respect to its enclosing barrel. Once inside the mold, the first material forms a skin layer, totally or partially surrounding the other material. In this way a part having a plurality of material properties may be produced in a single operation.

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English language abstract of Japanese Patent Publication No. JP 976286, Published Mar. 25, 1997, Derwent Information LTD 1999.

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