Method of processing mechanically removed porcine skins for ultimate gelatin or leather production
AssigneeDubuque Packing Company
InventorsEdward A. Whitney, Gerald M. Weiss
Life of this patent
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Abstract
A process for treatment of mechanically removed porcine skins for the production of edible gelatin or of both gelatin and leather, the present invention provides a step-wise method for chemical dehairing and degreasing of the skin, which method offers an environmentally more acceptable procedure for dehairing, degreasing, and ultimately treating the skin to produce gelatin and leather, the quality of the ultimate products being uncommonly high. The dehaired and degreased skin can then be processed for conventional gelatin production or said skin can be mechanically split into a grain layer for leather or gelatin production and a flesh layer for conventional gelatin or leather production.
Claims6
In a process for treating porcine skins which have been removed from the carcasses of porcine animals, the improvement comprising dehairing said skins in an over-all time of approximately 80 minutes by the following steps:
- (a) removing subcutaneous adipose and proteinaceous tissue from the skins for about 5 minutes with water constituting about 50% of the weight of skins at a temperature of about 85.degree. F. (29.4.degree. C.);
- (b) chemically burning the skins from step (a) for about 20 minutes with a solution at 85.degree. F..+-.1.degree. F. (29.4.degree. C..+-.0.56.degree. C.), the burning solution comprising about 3% lime, 6% soda ash, 1% sodium sulfhydrate, and 1% dimethylamine sulfate in aqueous solution, all measured by weight of skins;
- (c) neutralizing the product from step (b) with the neutralizing solution containing about 4% ammonium sulfate by weight of skins in water at 85.degree. F..+-.1.degree. F. (29.4.degree. C..+-.0.56.degree. C.) for about 5 minutes;
- (d) acidifying the product of step (c) with sulfuric acid solution containing about 1/2% sulfuric acid by weight of skins in water at 85.degree. F..+-.1.degree. F. (29.4.degree. C..+-.0.56.degree. C.) for about 30 minutes;
- and
- (e) washing out residual chemicals from the treated skins produced in step (d) for about 20 minutes with a washing solution of lime in water at a temperature of 85.degree. F..+-.1.degree. F. (29.4.degree. C..+-.0.56.degree. C.).
Dependencies are inferred from the claim text.