Method for extracting spinnable collagenous fiber from leather corner waste and waste leather

Abstract

The invention belongs to the technical field of leather processing and particularly relates to a method for extracting spinnable collagenous fiber from leather corner waste and waste leather. The method comprises the steps of soaking and smashing collected leather corner waste and waste leather, adopting a wet method fiber extraction method to extract fiber from raw materials, processing the raw materials without adding chemical additives, and enabling the raw materials to be completely dissociated and loosened into collagenous fiber. Therefore, fiber output rate is high, the problem that extraction efficiency is low is resolved, separation evenness of fiber is improved, strength of leather collagenous fiber is guaranteed, and length distribution is even.

Description

technical field [0001] The invention belongs to the technical field of leather processing, and in particular relates to a method for extracting spinnable collagen fibers from leather corner waste and waste leather. Background technique [0002] my country is a world-recognized major producer of tanning and shoemaking. In recent years, the annual export volume of major commodities in my country's leather industry has been around US$30 billion. The development of the leather industry has not only created significant benefits for the national economy, but also contributed to environmental protection and ecological balance. Bring huge burden and pressure. [0003] At present, more than 90% of the tanneries adopt the chrome tanning method for main tanning. After chrome tanning, many mechanical processes such as trimming, smoothing, and leather grinding will inevitably produce a large amount of chromium-containing waste (also known as chrome leather slag, chrome leather shavings)....

AI Technical Summary

Problems solved by technology

[0006] Patent CN200510032848.3 introduces a manufacturing method of leather fiber base cloth, in which it is mentioned that animal leather residues or leftovers and recycled waste leather are processed to obtain leather fibers, but the raw materials need to be decolorized, graded, etc. The process is cumbersome, and additives such as degreasing agent and bleaching agent are added, which will reduce the strength of the fiber itself

And the equipment used is non-standard self-made equipment, which is not easy to popularize and apply

[0007] Patent CN200510038623.9 introduces a leather fiber separator, which is a device used to extract fibers from raw leather, but the structure of the device is complex and the fiber output rate is low. The fiber output rate of this device is only 30-50%, and the waste of raw materials is serious. ,low efficiency

[0008] Invention patents such as CN200810060022.1, CN200610035347.5 and CN101935896A have also improved and updated the equipment and methods for the extraction of leather collagen fibers, but the extraction efficiency, the length of the extracted fibers, the strength and the effect of subsequent applications are not perfect. satisfactory

More importantly, the equipment is non-standard equipment, which is difficult to promote and apply

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