Composition and method for making a flexible packaging film

Patent metadata

Field	Value
Publication number	US-9631063-B2
Application number	US-201313828259-A
Country	US
Kind code	B2
Filing date	Mar 14, 2013
Priority date	Mar 14, 2013
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

Composition and method for making a flexible packaging film having highly loaded with at least one inorganic filler. A blown HDPE film comprising at least 50% by weight inorganic filler is oriented in the machine direction to increase yield and tensile strength, and reduce gauge variation to improve print qualities.

First claim

What is claimed is:

1. A method of making a flexible packaging film comprising:
providing a blown film comprising high density polyethylene resin, at least one skin layer on said blown film, wherein said skin layer comprises EAA (ethylene acrylic acid), wherein the blown film comprises at least 50% by weight inorganic filler, and an initial thickness;
compressing said blown film between rollers; and
orienting said blown film in a machine direction by passing the blown film between a set of heating rollers and stretching the blown film between the slow draw roller and a fast draw roller to produce an oriented film having a final thickness which is at least 35% less than said initial thickness.

2. The method of claim 1 wherein said inorganic filler comprises at least one of talc, clays, silicon dioxide, diatamaceous earth, Kaolin, micas, gypsum, potassium nitrate, sodium chloride, metal chlorides, dolomite, bentonite, montmorillonite, metal sulfates, ammonium nitrate, sodium nitrate, titanium dioxides, and calcium carbonate.

3. The method of claim 1 wherein said orienting step comprises a draw ratio of between 1.1:1 and 3.0:1.

4. The method of claim 1 , wherein said orienting further comprises:
passing the blown film between a set of annealing rollers; and
passing the blown film between a set of cooling rollers.

Assignees

• Frito Lay North America Inc

Inventors

• Leidolf Ashley
• Rodgers Brad Dewayne
• Soucy Benjamin

Classifications

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• B32B27/306

  comprising vinyl acetate or vinyl alcohol (co)polymers · CPC title

• B32B19/00

  Layered products comprising {a layer of} natural mineral fibres or particles, e.g. asbestos, mica · CPC title

• B32B27/302

  comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers · CPC title

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title