Cryovac, Inc.

Bradford E Webster

Anton L Timmons

George Dean Wofford

John R Wolf

Rafizi Ramli

Christopher Brown

Larry Bikle McAllister

Lawrence E Roberts

Jennifer S Peavey

Larry B Mcallllister

A die for coextruding a plurality of fluid layers includes one or more distribution plates for forming relatively thick layers, and a microlayer assembly for forming a plurality of microlayers. The die further includes internal fluid passages and/or forming surfaces to allow the microlayers to assemble into a microlayered fluid mass prior to merging with the relatively thick layers from the distribution plates.

Die for coextruding a plurality of fluid layers

A die for coextruding a plurality of fluid layers generally includes a primary forming stem, one or more distribution plates, and a microlayer assembly. The microlayer assembly includes a microlayer forming stem and a plurality of microlayer distribution plates.

Method for coextruding a plurality of fluid layers

A multilayer, heat-shrinkable film generally includes at least one bulk layer and a microlayer section comprising at least 10 microlayers, each of which has a thickness ranging from about 0.001 to 0.015 mil. The ratio of the thickness of any of the microlayers to the thickness of the bulk layer is at least about 1:2. The film has a total free shrink (ASTM D2732-03) of at least about 10% at 200&#xb0; F.

Multilayer, heat-shrinkable film comprising a plurality of microlayers

A multilayer, heat-shrinkable film generally includes at least one bulk layer and a microlayer section comprising a plurality of microlayers. The ratio of the thickness of any of the microlayers to the thickness of the bulk layer ranges from about 1:2 to about 1:40.

The invention is an extrusion apparatus having a driven feed segment that is rotatably driven about central mandrel or within a housing member. Rotation of the driven feed segment subjects one or more streams of resin introduced onto a surface thereof to transverse shear during radial flow. One of more driven feed segments can be assembled with other components of conventional extrusion die assemblies. Extrusion die assemblies can include one or more driven feed segments rotated in the same or opposite direction of each other. The number of streams of resin and rotational speed of the driven feed segment can be controlled to produce microlayered film having in excess of 4000 layers.

Growing community of inventors

Moore, SC, United States of America

Bradford E Webster