Pass-type fur chromium-free tanning method

Abstract

The invention provides a pass-type fur chromium-free tanning method, which comprises the following steps: (1) adjusting the pH value of pickled fur to 4.5-6.0 by using an alkali liquid, and then adjusting the water content of the fur; or pre-tanning pickled fur by using an aluminum tanning agent, then adjusting the pH value of the pre-tanned fur to 4.5-6.0 by using an alkali liquor, and adjustingthe water content of the fur; (2) paving the fur on a conveying mesh belt in a single-layer manner in a direction that the fur surface is downward, uniformly spraying a tanning liquid prepared from anorganic tanning agent to the leather plate of the fur from the meat surface of the fur in a high-pressure jet flow mode through high-pressure spray nozzles arranged above the conveying mesh belt in an array mode under the condition that the conveying mesh belt drives the fur to move horizontally at a constant speed, and controlling the jet flow speed of the tanning liquid to enable the tanning liquid to be uniformly distributed in the leather plate of the fur; and (3) stacking the fur billets obtained in the step (2) for 24-48 hours to finish tanning. According to the method, the discharge amount of the tanning waste liquid can be effectively reduced, wool fibers are prevented from being damaged by the organic tanning agent, and the quality of the fur is improved.

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