P
USH1935HExpiredUtilityPatentIndex 70

Combination pouch and release sheet and method for producing same

Assignee: TREDEGAR CORPPriority: Sep 26, 1997Filed: Sep 26, 1997Granted: Jan 2, 2001
Est. expirySep 26, 2017(expired)· nominal 20-yr term from priority
Inventors:WILHOIT DARREL LOELTRIBBLE JAMES D
A61F 13/5611B32B 7/06B29C 59/10B29C 59/046B32B 2310/14B29K 2083/00B32B 3/28B32B 38/0008B32B 37/153B32B 2323/00B32B 38/06
70
PatentIndex Score
9
Cited by
42
References
35
Claims

Abstract

An improved release sheet for use in connection with a sanitary catamenial pad is disclosed. The improved release sheet exhibits superior noise, drape, bulk and gloss characteristics due to its method of production. A polyethylenic release material containing silicone capable of being fixed within the surface of the release material is coextruded with at least a base film to provide a film which is also embossed to provide a combination pouch and release sheet with superior physical characteristics. Corona treatment of the release material layer preferably occurs following embossing, but can occur prior to embossing or both prior to and following embossing to fix the silicone within the surface of the release material. In-line recycling of materials provides additional cost advantages.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
       1. A sheet having improved release properties, said sheet comprising: 
       a release material containing silicone;  
       a base film;  
       said release material coextruded with said base film to form a multilayered release film; said release material corona treated to fix into position on a molecular level said silicone; and  
       said release film including an embossed surface.  
     
     
       2. The sheet of claim  1 , wherein the release material is a polyolefin. 
     
     
       3. The sheet of claim  1 , wherein the release material is a polyethylemic polymer. 
     
     
       4. The sheet of claim  1 , wherein the base film is a polyolefin. 
     
     
       5. The sheet of claim  1 , wherein the base film does not contain silicone. 
     
     
       6. The sheet of claim  1 , wherein the base film comprises a polyethylenic material. 
     
     
       7. The sheet of claim  1 , wherein the multilayered release film is embossed. 
     
     
       8. The sheet of claim  7 , wherein said release material is corona treated after the release film is embossed. 
     
     
       9. The sheet of claim  7 , wherein said release material is corona treated before the release film is embossed. 
     
     
       10. The sheet of claim  7 , wherein said release material is corona treated both prior to and following embossing of the release film. 
     
     
       11. The sheet of claim  1 , wherein the sheet is used in connection with a combination pouch and release sheet for a sanitary catamenial pad. 
     
     
       12. The sheet of claim  1 , wherein the base film is comprised of a polyolefin containing silicone. 
     
     
       13. A combination pouch and sheet having improved release properties, said combination pouch and sheet comprising: 
       an upper layer comprised of a polyethylenic polymer release material containing silicone;  
       a core layer comprised of a polyolefin base film not containing silicone;  
       a lower layer comprised of a polyolefin base material not containing silicone;  
       said core layer coextruded with said upper layer and said lower layer to form a multilayered release film;  
       said upper layer corona treated to fix into position on a molecular level said silicone; and  
       said multilayered release film embossed to provide said sheet.  
     
     
       14. The combination pouch and sheet of claim  13 , wherein the core layer is comprised of a polyolefin base film containing silicone. 
     
     
       15. A method for the production of a sheet having improved release properties, said sheet comprising the steps of: 
       preselecting a release material;  
       preselecting a base material;  
       preselecting a base film;  
       coextruding a layer of said release material and a layer of said base material on opposing sides of a layer of the base film to form a release film;  
       embossing the release film to provide improved physical characteristics; and  
       corona treating the surface of the release material layer of the release film.  
     
     
       16. The method of claim  15 , wherein the steps of preselecting a release material and a base material include the selection of polyolefins. 
     
     
       17. The method of claim  15 , wherein the step of preselecting a release material includes the selection of a polyethylenic polymer containing silicone. 
     
     
       18. The method of claim  15 , wherein the step of preselecting a base material includes the selection of a polyethylenic polymer not containing silicone. 
     
     
       19. The method of claim  15 , wherein the step of preselecting a base film includes the selection of a polyolefin. 
     
     
       20. The method of claim  15 , wherein the step of preselecting a base film includes selection of a polyethylenic polymer not containing silicone. 
     
     
       21. The method of claim  15 , wherein the sheet is used as a combination pouch and release sheet for a sanitary catamenial pad. 
     
     
       22. The method of claim  15 , wherein the release material layer is corona treated after the sheet is embossed. 
     
     
       23. The method of claim  15 , wherein the release material layer is corona treated before the sheet is embossed. 
     
     
       24. The method of claim  15 , wherein the release is corona treated both prior to and following embossing the sheet. 
     
     
       25. A method for the production of a sheet having improved release properties, comprising the steps of: 
       preselecting a release material of polyethylenic polymer containing silicone;  
       preselecting a base film of polyethylenic polymer not containing silicone;  
       coextruding at least one layer of said release material onto a layer of said base film to form a release film;  
       embossing said release film; and  
       corona treating the surface of the release material layer of the release film to fix into position on a molecular level the silicone.  
     
     
       26. The method of claim  25 , wherein the sheet is used as a combination pouch and release sheet for a sanitary catamenial pad. 
     
     
       27. The method of claim  25 , wherein the release material layer is corona treated after the release film is embossed. 
     
     
       28. The method of claim  25 , wherein the release material layer is corona treated before the release film is embossed. 
     
     
       29. The method of claim  25 , wherein the release material is corona treated both prior to and following embossing of the release film. 
     
     
       30. The sheet of claim  1 , wherein said release material layer is less than about 10% of the total thickness of said multilayered release film. 
     
     
       31. The combination pouch and sheet of claim  13 , wherein said upper layer is less than about 10% of the total thickness of said multilayered release film. 
     
     
       32. The combination pouch and sheet of claim  31 , wherein said lower layer is less than about 10% of the total thickness of said multilayered release film. 
     
     
       33. The method of claim  15 , wherein the layer of said release material is less than about 10% of the total thickness of said release film. 
     
     
       34. The method of claim  33 , wherein the layer of said base material is less than about 10% of the total thickness of said release film. 
     
     
       35. The method of claim  25 , wherein the layer of said release material is less than about 10% of the total thickness of said release film.

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