Flexible packaging film

• US 3,912,843 A
• Filed: 06/29/1970
• Issued: 10/14/1975
• Est. Priority Date: 06/29/1970
• Status: Expired due to Term

• Current Assignee: BRH Corporation
• Original Assignee: Irvin L. Brazier
• Inventors: Brazier, Irvin L.
• Primary Examiner(s): Van Horn, Charles E.
• Assistant Examiner(s): Dawson, Robert A.
• Application Number:
  US05/050,614
• Time in Patent Office: 1,933 Days
• Field of Search: 99/171LP 117/7 161/227,247,254,402 426/415
• US Class Current: 428/475.8
• CPC Class Codes: B32B 2250/24 All layers being polymeric
• CPC Class Codes: B32B 2307/31 Heat sealable
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2323/10 Polypropylene
• CPC Class Codes: B32B 2553/00 Packaging equipment or accessories not otherwise provided for
• CPC Class Codes: B32B 27/00 Layered products comprising a layer of synthetic resin fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/31743 Next to addition polymer from unsaturated monomer[s]
• CPC Class Codes: Y10T 428/3192 Next to vinyl or vinylidene chloride polymer

Abstract

A multiple-layer flexible packaging film including layers of nylon, biaxially oriented polypropylene and a heat sealable polyolefin in which the polypropylene and the heat sealable polyolefin form exterior layers and the nylon is an interior layer positioned therebetween. A saran barrier layer is also included as an interior layer.

Claims

1. A FIRST EXTERIOR LAYER CONSISTNG OF BIXIALLY ORIENTED POLYPOLYLENE,

2. A flexible packaging film according to claim 1 further including:

a saran barrier layer positioned between the first and second exterior layers.

3. AN INTERIOR LAYER CONSISTING OF NYLON POSITIONED BETWEEN THE FIRST AND SECOND EXTERIOR LAYERS, THE FILM CHARACTERIZED IN TAT THE SECOND EXTERIOR LAYER AND THE INTERIOR LAYER ARE EACH MORE EXTENSIBLE THAN THE FIRST LAYER TO PROVIDE A FILM PARTICULARLY SUITABLE FOR MAKING GAS-FILLED PACKAGES RESISTANT TO COMPRESSIVE FAILURE AND BURST FAILURE.