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US 6,188,043 B1Granted
Method for making permeable film
AssigneeCryovac, Inc.
InventorJoseph E. Owensby
Life of this patent
Estimating the term…
Abstract
In a method for making a permeable film, a physical force is applied to a film of a first material containing particles of a second material which is different from the first material. The second material has a higher susceptibility to the physical force than does the first material. Applying the physical force to the film affects the particles which in turn affect the first material of the film, thereby increasing permeability of the film.
Claims25
A method of increasing the permeability of a film comprising:
- providing a film having:
- at least one layer comprising one or more polymeric materials selected from the group consisting of olefinic resins, poly(vinyl chloride), ionomers, nylons, and homo- and co-polymers of ethylene;
- and
- a plurality of solid particles incorporated into the at least one layer, wherein the solid particles:
- comprise a particle material different from the one or more polymeric materials;
- and
- have a higher susceptibility to a selected physical force than does the one or more polymeric materials;
- and
- applying the selected physical force to said film so as to affect said particles and create perforations in the at least one layer, whereby the permeability of the at least one layer is increased.
6 more elements
A method of increasing the permeability of a film comprising:
- providing a film having:
- at least one layer comprising a first material;
- and
- a plurality of solid particles incorporated into the at least one layer, wherein the solid particles:
- comprise a second material different from the first material;
- and
- have a higher susceptibility than the first material to a selected physical force selected from the group consisting of inductive heating, infrared heating, magnetic force, ultrasonic excitation, microwave irradiation, e-beam irradiation, laser irradiation, and mechanical stretching;
- and
- applying the selected physical force to the film to affect the particles and create perforations in the at least one layer, whereby the permeability of the at least one layer is increased.
6 more elements
A method of increasing the permeability of a film comprising:
- providing an oriented, heat-shrinkable film having:
- a Young's modulus as measured by ASTM D882 of at least about 200 MPa;
- a total free shrink of from about 5% to about 150% at 85° C. in accordance with ASTM D2732;
- at least one layer comprising a first material;
- and
- a plurality of solid particles incorporated into the at least one layer, wherein the solid particles:
- comprise a second particle material different from the first material;
- and
- have a higher susceptibility than the first material to a selected physical force;
- and
- applying the selected physical force to said film so as to affect said particles and create perforations in the at least one layer, whereby the permeability of the at least one layer is increased.
8 more elements
Dependencies are inferred from the claim text.