Howard H Castleman

US Patent:

40487369, Sep 20, 1977

Filed:

Feb 11, 1975

Appl. No.:

5/548895

Inventors:

Howard H. Castleman - Charlotte NC
Henry G. Stewart - Harrisburg NC

Assignee:

Package Products Company, Inc. - Charlotte NC

International Classification:

A44C 300

US Classification:

40 2R

Abstract:

A substantially opaque printed heat sealable composite sheet material suitable for use as a packaging material and including a front film of a transparent oriented heat stable polymer, a layer of printing underlying the front film and visible on the outer surface thereof, a rear film of a pigmented polymer of a predetermined color having a readily heat sealable outer surface, and an intermediate film of a substantially opaque pigmented polymer tightly bonded to the inner surface of the front film and to the inner surface of the rear film and serving to increase the opacity of the sheet material and to enhance the brightness and purity of color of the layer of printing.