TEXTURED FILM WITH DEEP POCKETS

Abstract

A thermoplastic film having a first surface defining pockets, each pocket having a depth and breadth and a bottom, the bottom is preferably textured and is thinner than the thickness of the first surface. Devices made from the film include one or more of a variety of materials contained within the pockets and a second layer overlying the first surface to cover the openings of the pockets. A process of making the film is also disclosed.

Description

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 shows a schematic of the textured film of the present invention.

FIG. 2 shows a cross-section of the textured film as seen along line A-A of FIG. 1.

FIG. 3 shows a schematic of a delivery system comprising the textured film of FIG. 1.

FIG. 4 shows a schematic of a production line for producing the textured film of FIG. 1.

FIG. 5 shows a section of the composite screen formed from two different tools.

Claims

1. A textured film having a first surface defining a plurality of pockets, each pocket having a bottom with a thickness less than that of said first surface.

2. The device of claim 1, wherein said pockets are arranged in a pattern and wherein said pockets are of substantially equal size.

3. The device of claim 1, wherein each pocket has a textured second surface at said bottom.

4. The device of claim 3, wherein said second surface is continuous and not apertured.

5. The device of claim 4, wherein said second surface has a texture of 20-60 cells per linear inch.

6. The device of claim 3, wherein the texture on said second surface has a z-direction delta and wherein the ratio of depth to said delta is about 1.5 to about 5.

7. The device of claim 1, wherein said film material is selected from the group consisting of polyolefins, polyamides, polyesters, polyvinylchlorides, and polyacrylic acids.

8. The film of claim 1, wherein the film is selected from the group consisting of biodegradable and compostable films.

9. A device comprising a textured film having a first surface defining pockets and a second layer overlaying said first surface.

10. The device of claim 9, wherein at least one of said pockets contains an active substance and wherein said second layer is selected from the group consisting of a woven fabric, a nonwoven fabric, a film and combinations thereof.

11. The device of claim 10, wherein said active substance is selected from the group consisting of cleaning agents, scents, solvents, skin lotions, sun screens, topical medications, reactive substances, neutralizing agents, antimicrobial agents, and mixtures thereof; wherein each pocket has a bottom having a thickness less than that of the first surface; and wherein said device is constructed to deliver said active substance upon the application of pressure.

12. The device of claim 10, wherein said active substance is selected from the group consisting of reactive chemicals, activated charcoal, neutralizing agents, antimicrobial agents, super absorbent material, and mixtures thereof and wherein said device is constructed to absorb fluids into at least one of said pockets.

13. The device of claim 10, wherein said active substance is selected from the group consisting of insecticides, herbicides, fertilizers, and mixtures thereof and wherein said device is constructed to release said active substance under predetermined conditions.

14. The device of claim 10, wherein said active substance comprises at least one substance selected from the group consisting of gasses, gels, and liquids and wherein said device is constructed to retain the active substance when said device is subjected to pressure.

15. The film of claim 1, wherein the film is selected from the group consisting of biodegradable and compostable films.

16. A method of making a textured film, comprising (1) providing a suction roll having a first tool defining voids and a second tool disposed within said first tool and defining a texture within said voids; and (2) contacting a web of polymeric material with said suction roll to draw said web onto said first and second tools, whereby the voids create pockets in a first surface of said web having a thickness, each pocket having a textured bottom created by said texture of said second tool, and wherein each textured bottom has a thickness less than the thickness of said first surface.

17. The method of claim 16, wherein said first and second tools are discrete cylindrical members, one disposed within the other.

18. The method of claim 16, wherein said first and second tools are integrally formed.

19. The method of claim 16, wherein said web of polymeric material comprises a film and wherein said process further comprises heating said film above its softening point.

20. The method of claim 16, wherein the web of polymeric material comprises a molten polymer curtain.