Method of producing an internally reinforced thermoplastic film and film and articles produced therefrom
AssigneeMobil Oil Corporation
InventorGordon L. Benoit
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Abstract
A method for producing an internally reinforced aeolotropic thermoplastic film web through coextrusion of two polymeric materials, and more particularly, a method of forming a film web possessing an enhanced tensile strength in at least the longitudinal or machine direction of the film web. A plastic film having internal striplike reinforcements entirely embedded within a matrix material is formed by the inventive method, and such film is utilized for various articles; for instance, plastic bags, bag components such as handles by liners, stretch wrap film, and the like.
Claims20
An internally reinforced aeolotropic thermoplastic film web constituted of coextruded thermoplastic resins having an increased tear resistance and tensile strength in at least the longitudinal or machine direction of said film web;
- comprising:
- (a) a first thermoplastic resin forming a matrix for said thermoplastic film web;
- and
- (b) a plurality of discrete parallel spaced continuous strips or stripes of a second thermoplastic resin embedded entirely within the confines of said first film web-forming thermoplastic matrix and extending in the machine direction of said film web to constitute said internally reinforced aeolotropic thermoplastic film having said increased tensile strength.
A method of producing an internally reinforced aeolotropic thermoplastic film web constituted of coextruded thermoplastic resins, said film having an increased tensile strength in at least the longitudinal or machine direction of said film web;
- comprising the steps of:
- (a) extruding a first thermoplastic resin through an extrusion die orifice so as to form said resin into a matrix for said thermoplastic film web;
- (b) concurrently extruding a plurality of discrete continuous strips or stripes of a second thermoplastic resin through said die orifice, said strips extending in parallel spaced relationship in the machine direction of said film web, and said strips being embedded entirely within the confines of said first film web-forming thermoplastic matrix so as to produce said internally reinforced aeolotropic thermoplastic film web.
Dependencies are inferred from the claim text.