W. R. Grace Co.

W. R. Grace & Co., Cryovac Div.

W. R. Grace & Co., Cryovac Division

Michael D Esakov

Frederick D Stringer

Daniel J Ferguson

Arvid Honkanen

David C Hudgens, Jr

Daniel F Ferguson

A heat sealable and shrinkable, coextruded, multi-layer packaging film having a propylene homopolymer base layer and a skin layer of a preferred blend of 60% to 80% propylene-ethylene copolymer with propylene homopolymer provides a sealing temperature range of up to 30.degree. C.

Heat sealable, multi-ply polypropylene film

In the process of extruding tubular thermoplastic film or tape, the production rate can be improved by using a smooth support plug to stabilize and shape the extrudate after it has been cooled and at least partially solidified. A principal function of the support plug is to assist in supporting the long slender column of partially solidified extrudate which is above the plug. The result is a significant increase in the output of the extrusion process.

Method and apparatus for high speed extrusion of thermoplastic materials

An apparatus and process for laminating a flexible sheet of covering material to a foamed thermoplastic sheet wherein the process includes the steps of expanding aged or directly extruded thermoplastic foam sheet by heat until the foam has reached its softening point; heating the covering material to above the melting point of the foam; and, applying the heated covering material to the softened foam sheet to bond the sheet to the foam thereby forming a laminated product.

Low density laminated foam and process and apparatus for producing same

Growing community of inventors

Greer, SC, United States of America

Michael D Esakov