A kind of chrome-free tanning method of through type fur

Abstract

The invention provides a chrome-free tanning method for through-type fur, which comprises the following steps: (1) adjusting the pH value of the pickled fur to 4.5-6.0 with lye, and then adjusting the water content of the fur; or, using an aluminum tanning agent Pre-tan the pickled fur, then use lye to adjust the pH value of the pre-tanned fur to 4.5-6.0 and adjust the moisture content of the fur; On the condition that the transmission mesh belt drives the fur to move horizontally at a uniform speed, the tanning liquid prepared by the organic tanning agent is evenly sprayed from the flesh surface of the fur to On the skin board of the fur, control the jet velocity of the tanning liquid so that the tanning liquid is evenly distributed in the skin board of the fur; (3) Pile the fur blanks obtained in step (2) for 24-48 hours to complete the tanning. The method can effectively reduce the discharge of tanning waste liquid, avoid organic tanning agents from damaging wool fibers, and improve the quality of fur.

Description

technical field [0001] The invention belongs to the technical field of fur processing and production, and relates to a chrome-free tanning method for through-type fur. Background technique [0002] At present, most fur products are tanned with basic chromium sulfate. The biggest advantage of chrome tanned leather is that the finished leather has high moisture and heat stability, which is conducive to subsequent dyeing operations. With the enhancement of consumers' health awareness, chrome-free tanned fur products will be It is the future development trend. There are two main types of machinery used in the tanning process - drums and grooves. The most commonly used is the drum, through the rotation of the drum, the tanning agent in the bath liquid can be promoted to penetrate into the leather board evenly, but the penetration of the tanning agent from the tanning liquid into the leather board is relatively slow, and the tanning time is long. In the tanning agent penetration...

AI Technical Summary

Problems solved by technology

The process of tanning in the bath is a solid-liquid mass transfer process. For chrome tanning, there is a problem that the tanning agent in the bath cannot be completely absorbed by the skin. After tanning, a large amount of chrome tanning waste will be produced. These waste liquids contain chromium compounds and neutral salts, which cannot be discharged directly, which brings about the problem of chrome tanning waste liquid treatment, which not only causes environmental pressure, but also increases production costs

For organic tanning agents, the currently available organic tanning agents are mainly formaldehyde, glutaraldehyde, organic phosphine, etc., although they can solve the environmental and safety problems caused by chromium salt tanning to a certain extent, but due to the existing Fur tanning is done by immersing the whole fur in a bath. Both the quilt and the leather board will be in contact with the tanning agent. The long-term contact between the tanning agent and the wool fiber will cause certain damage to the wool fiber, or the tanning agent and the wool fiber will grow. Time interaction leads to the problem of hair yellowing, and the use of organic tanning agents still cannot avoid the problem of discharge and treatment of tanning waste