Class Code: 2623
Per NCCI's Scopes Code Description:
Tanning—raw hides are washed in a solution of caustic soda, borax, and salt soda to clean and soften. Excess flesh is removed by fleshing machines. Hides are then placed in a lime solution to remove hair and are softened by agitating paddles using chemicals such as oropan, puerine, ammonium chloride, and an inert material such as corn meal. Treating with a solution of sulphuric acid and salt follows. Tanning is then carried out in revolving drums containing water, salt, green basic chromium sulfate, and sodium bicarbonate. Tanned hides are split, dyed, and finished. Sheepskin may be tanned with or without wool, dependent upon its use.
Leather Embossing—applies to a specialist risk that obtains hides or skins from a tannery. The risk dyes the leather, embosses it, grains it, and finishes by hand rubbing and buffing. The finished leather is sent to shoe or leather goods manufacturers.
Leather Mfg.—Patent or Enamel—tanned hides are split into desired thickness, degreased, given a coat of linseed oil and lampblack thinned with naphtha, and again coated with a mixture of linseed oil and pyroxylin. Stock is then baked and rubbed down with pumice. The coating (adding varnish and coloring), baking, and rubbing down may be repeated several times.
Wool Pulling—there are three methods of pulling wool from pelts. The simplest is “sweating” the pelts until wool is loosened to be pulled by hand or machine. This method could damage the valuable skin. The lime process involves the painting of the flesh side of the pelts with lime. This loosens the wool but also causes skin damage and has a bad effect on the dyeing quality of the wool. The depilatory process is the best and varies from the lime process in that a solution of sodium sulfate, sulphuric acid, and oyster shells is used instead of lime.