Method for treating slunk

Abstract

The invention provides a method for treating slunk. The method comprises the steps of: mainly soaking the slunk with water, coating, liming, deliming, softening, pickling and bating, wherein a coating liquor comprises the components of water, sodium sulfide, sodium hydrosulfide, a liming auxiliary agent and starch; and a liming liquor comprises the components of water, multielement mixed alkali, liming enzyme, sodium sulfide and a liming auxiliary agent. By adding the liming auxiliary agent and the starch in the coating process, the concentration of sodium sulfide is adjusted, the treatment effect on skin slunk grains can be enhanced, a smooth skin surface can be favorably obtained, and the cleanliness of the skin surface is increased; meanwhile, the multielement mixed alkali, in place of lime, can act together with the liming enzyme in the liming process, so that collagen fibers are favorably dispersed and fiber bundles are expanded. As lime is unnecessarily added to the coating and liming processes, the problems of high cost, serious pollution and equipment corrosion brought by lime can be avoided; and as the skin surface of the slunk is tender and susceptible, the problem of damage to the skin surface can be avoided due to no lime addition.

Description

technical field [0001] The invention belongs to the technical field of leather processing, and in particular relates to a method for processing fetal cowhide. Background technique [0002] Unprocessed raw hides and hides are mainly composed of collagen fibers, fibrin, elastic fibers, arrector pili muscles, etc. After drying, they harden, lose flexibility and softness, and are easy to break and shrink when exposed to high temperatures. For tanning. Tanning is to remove the hair and non-collagen fibers of the raw hide, so that the collagen fibers of the dermis are moderately loosened, fixed and strengthened, and then a series of chemical (including biochemical) and mechanical treatments such as finishing. During the tanning process, it is necessary to remove other non-collagen fiber substances as much as possible on the basis of protecting and opening the collagen fibers, and liming treatment can achieve this purpose. [0003] The importance of liming treatment has long been...

AI Technical Summary

Problems solved by technology

However, the use of lime will bring the following problems at the same time: the lime absorption and utilization rate of the hides is low, and at least 20% of the lime weight of the hides needs to be added to meet the requirements of tanning; most of the used lime will be suspended in water, forming A large amount of sludge is seriously polluted, which makes sewage treatment difficult; the liming process needs to be completed in drum equipment, and limestone is a strong alkali, which will cause corrosion to the equipment; the skin will form alkali swelling during the liming process, The thickness can be more than 3 times, resulting in fragile and sensitive grain surface, and lime is easy to form hard calcium spots on the drum, increasing the risk of damage to the grain surface of the hide; in order to prevent gray spots and uneven dyeing of the hide in the later stage of processing The problem is that deliming treatment needs to be carried out in the later stage to remove all the lime. In this step, a deliming agent with a high price needs to be introduced, which increases the cost of production and processing