Method for making permeable film
First Claim
Patent Images
1. 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.
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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.
20 Citations
25 Claims
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1. A method of increasing the permeability of a film comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
the particle material includes a ferromagnetic material; and
the selected physical force includes magnetic induction force.
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8. A method according to claim 1, wherein:
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the particle material includes carbon black, and the selected physical force includes infrared heating.
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9. A method according to claim 1, wherein the selected physical force is applied while said film is under tension.
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10. A method according to claim 1, wherein said providing step includes providing a film having at least two layers.
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11. A method according to claim 1, wherein said particles have a size of between about 2.5 μ
- m and about 25 μ
m.
- m and about 25 μ
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12. A method according to claim 1, wherein the at least one layer incorporates said particles in an amount of between about 0.4% and about 4% based on the weight of said film.
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13. The method of claim 1 wherein the providing step includes providing a film having a Young'"'"'s modulus as measured by ASTM D882 of at least about 200 MPa.
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14. The method of claim 1 wherein the providing step includes providing an oriented film.
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15. The method of claim 1 wherein the providing step includes providing a heat-shrinkable film having a total free shrink of from about 5% to about 150% at 85°
- C. in accordance with ASTM D2732.
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16. A method of increasing the permeability of a film comprising:
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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. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of increasing the permeability of a film comprising:
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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.
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Specification
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Current AssigneeCryovac Incorporated (Sealed Air)
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Original AssigneeCryovac Incorporated (Sealed Air)
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InventorsOwensby, Joseph E.
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Primary Examiner(s)JOHNSON, LINDA B
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Application NumberUS09/200,385Time in Patent Office812 DaysField of Search219/384, 264/154, 264/41US Class Current219/384CPC Class CodesB29C 55/005 characterised by the choice...B29K 2105/04 cellular or porousB29K 2105/16 Fillers
