Fibrous base web bonding system and method
First Claim
1. A bonded porous fibrous sheet material for use in the manufacture of food casings and the like comprising a fibrous base web containing about 10% by weight and less of a bonding system comprising a first treatment of a thermoplastic film forming material effective for imparting high alkaline strength to the base web and a subsequent treatment of a film forming material and an insolubilizing agent for the film forming material, said subsequent treatment being effective to impart high wet strength and absorption to the first treated web without substantially reducing the alkaline strength thereof.
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Accused Products
Abstract
A bonded porous sheet material for use in the manufacture of food casing, said material being produced by treating a fibrous web with a thermoplastic film forming material which bonds the fibers of the web and imparts high alkaline strength to the treated wet and subsequently treating the bonded fiber web with a solution of film forming material and an insolubilizing agent for the film forming material.
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Citations
20 Claims
- 1. A bonded porous fibrous sheet material for use in the manufacture of food casings and the like comprising a fibrous base web containing about 10% by weight and less of a bonding system comprising a first treatment of a thermoplastic film forming material effective for imparting high alkaline strength to the base web and a subsequent treatment of a film forming material and an insolubilizing agent for the film forming material, said subsequent treatment being effective to impart high wet strength and absorption to the first treated web without substantially reducing the alkaline strength thereof.
- 13. A food packaging material comprising a fibrous base web and a coating thereon comprising a first treatment of a poly(vinyl alcohol) film forming material and a subsequent treatment of a film forming material selected from the group consisting of celulose based materials, cationic and anionic starches and modified proteins and an insolubilizing agent for the film forming material selected from the group consisting of dialdehydes, alkaline curing resins, melamine formaldehyde, glyoxylated polyacrylamides, multivalent metal ions, inorganic salts, urea formaldehyde and polyamides.
- 14. A process for producing a bonded porous fibrous sheet material for use in the manufacture of food casings comprising the steps of treatment the base web material with a first bonding solution of a thermoplastic film forming material effective for imparting high alkaline strength to the web and subsequently treating the thermoplastic bonded web with a solution of a film forming material and an insolubilizing agent for the film forming material, said subsequent treatment being effective to impart high wet strength and absorption to the first treated web without substantially reducing the alkaline strength thereof.
Specification