Frederick D Stringer

US Patent:

42871514, Sep 1, 1981

Filed:

Dec 13, 1976

Appl. No.:

5/749861

Inventors:

Michael D. Esakov - Greer SC
David C. Hudgens - Lyman SC
Frederick D. Stringer - Greenville SC

Assignee:

W. R. Grace & Co. - Duncan SC

International Classification:

B29F 308

US Classification:

264560

Abstract:

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.

US Patent:

44394780, Mar 27, 1984

Filed:

Apr 15, 1982

Appl. No.:

6/368598

Inventors:

Daniel F. Ferguson - Spartanburg SC
Frederick D. Stringer - Greenville SC
Michael D. Esakov - Greer SC

Assignee:

W. R. Grace & Co., Cryovac Division

International Classification:

B32B 2708

US Classification:

428137

Abstract:

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.

US Patent:

42422973, Dec 30, 1980

Filed:

Dec 31, 1979

Appl. No.:

6/108879

Inventors:

Raymond B. Dacey - Simpsonville SC
Frederick D. Stringer - Greenville SC

Assignee:

W. R. Grace & Co. - Duncan SC

International Classification:

B29C 2500
B29D 720
B29D 722

US Classification:

264230

Abstract:

A generally cylindrical core for winding a web of sheetlike material has portions with a lesser diameter than other portions such that otherwise baggy areas of the web overlie the lesser diameter area of the core. The core particularly solves the problem of elongated edges on a wound film of heat shrinkable thermoplastic material caused by differential shrinkage about a core.

US Patent:

43903851, Jun 28, 1983

Filed:

Nov 27, 1981

Appl. No.:

6/325161

Inventors:

Daniel J. Ferguson - Spartanburg SC
Frederick D. Stringer - Greenville SC
Michael D. Esakov - Greer SC

Assignee:

W. R. Grace & Co., Cryovac Div. - Duncan SC

International Classification:

B32B 3116

US Classification:

156229

Abstract:

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.

US Patent:

41147561, Sep 19, 1978

Filed:

Dec 13, 1976

Appl. No.:

5/749945

Inventors:

Raymond B. Dacey - Simpsonville SC
Frederick David Stringer - Greenville SC

Assignee:

W. R. Grace & Co. - Duncan SC

International Classification:

B65D 8567
B65H 7702

US Classification:

206389

Abstract:

A generally cylindrical core for winding a web of sheetlike material has portions with a lesser diameter than other portions such that otherwise baggy areas of the web overlie the lesser diameter area of the core. The core particularly solves the problem of elongated edges on a wound film of heat shrinkable thermoplastic material caused by differential shrinkage about a core.