PROCESS FOR THE SEPARATION OF A SUBSTANTIAL QUANTITY OF FAT FROM A RAW MATERIAL FOR PRODUCING GLUE

摘要

Most of the fat content is separated by heating to a temp. below contraction temp. of collagen and above fat m.pt. followed by compression to separate the fat and albumin where the unswollen skin is tanned to give a contraction temp. of 43-70 degrees C and acidified in a bath of pH 1.7-3 (adjusted by inorganic acid) and then agitated in a axially rotating tank. Tanning is performed with 0.1-2% formaldehyde. Animal skin contains 80% water, 6% collagen and 14% fat. On dry wt. the fats are 30-66%. Requires one pressing operation only to extract high quality fat, using much less water. The product is used as animal foodstuffs.