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A leather wet finishing process to improve the problem of poor leather position

A wet finishing and leather technology, which is applied in the field of leather wet finishing technology, can solve the problems of inability to eliminate poor animal skin parts, inability to adapt to large-scale production, and inability to meet large-scale production.

Active Publication Date: 2020-04-21
XINGYE LEATHER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By grouping batches, the differences between animal skins can be eliminated, but the position differences of the same animal skin cannot be eliminated; other methods can achieve certain effects in individual processing, but cannot meet the needs of large-scale production
2) Chemical method: choose appropriate combination treatment for different raw materials, and solve the position difference to make the finished leather feel even and consistent. But it is not suitable for mass production and cannot meet the requirements of mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1 discloses that a kind of leather wet finishing process for improving the problem of poor leather position comprises the following steps:

[0016] 1. The wet blue leather that has been squeezed and evenly shaved is grouped into batches, weighed, and the addition of other substances is calculated based on the weight of the wet blue leather as 100 parts by weight;

[0017] 2. Rinsing: Add 300 parts of water at 45°C, 0.5 part of formic acid, and 0.2 part of surfactant Borron SAF into the drum, turn it for 60 minutes, drain clean; and wash with 300 parts of water at 35°C for 5 minutes;

[0018] 3. Fill in the blanks: Add 120 parts of water at 35°C, 2.5 parts of melamine-aldehyde condensed amphoteric resin (Tumpler, TRUPOTAN MAU), 2 parts of modified protein (Dawei, DOWELLTAN TB66), turn for 50min, and adjust the pH with sodium formate to be 4.0-4.2 during the rotation of the drum;

[0019] 4. Retanning: Add 1 part of dye, 2 parts of melamine retanning agent TAN...

Embodiment 2

[0026] The leather wet finishing process for improving the problem of poor leather parts in Example 2 is basically the same as in Example 1, the difference is that the filling process in Example 2 is as follows: add 120°C of water at 35°C to the drum of the rinsed wet blue leather. 2 parts, 2 parts of anionic polycarboxylate (INCO, INCOFLOR PRETAN ANF, Spain), 2 parts of melamine-aldehyde condensed amphoteric resin (Tumpler, TRUPOTAN MAU), turn 50min, and adjust the pH to 4.0-4.2 with sodium formate.

[0027] Through the leather wet finishing process described in Example 2 to improve the problem of poor leather parts, the whole piece of crust leather has no loose surface, full hand feeling, and almost uniform thickness. No difference; about 10% higher utilization.

Embodiment 3

[0029]The leather wet finishing process for improving the problem of poor leather parts in Example 3 is basically the same as in Example 1, the difference is that the filling process in Example 3 is as follows: add 120°C of water at 35°C to the drum of the rinsed wet blue leather. 1.5 parts of acrylic acid polymer (Derui, MAGNOPAL TGR), adjust the pH to 4.0, turn 30min; add 1.5 parts of anionic polycarboxylate (Spain INCO, INCOFLOR PRETAN ANF), adjust the pH to 4.1, turn 30min; 2 parts Melamine-aldehyde condensed amphoteric resin (Tumpler, TRUPOTAN MAU), adjust the pH to 4.2, and turn for 60min.

[0030] Through the leather wet finishing process described in Example 3 to improve the problem of poor leather parts, the whole piece of crust leather has no loose surface, full hand feeling, and almost uniform thickness. Compared with other parts, the original loose belly part is almost No difference; about 10% higher utilization.

[0031] In summary, the leather wet finishing proc...

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Abstract

The invention relates to the technical field of leather production processes, and provides a leather wet arrangement process for improving leather part difference problems. A blank filling procedure is added after rinsing and before retanning; wet leather empty and loose parts consisting of collagenous fibers are selectively filled by using zwitterionic polymers to effectively improve the leatherpart difference problems; the thicknesses of whole leathers arranged through the leather wet arrangement process for improving the leather part difference problems are nearly uniform and consistent; and abdomen empty and loose parts are hardly different from other parts, so that the blank leather particle surface flatness and fineness are improved, and the blank leather utilization rate can be increased by 5-10%.

Description

technical field [0001] The invention relates to the technical field of tanning technology, in particular to a leather wet finishing process for improving the problem of poor leather parts. Background technique [0002] Leather is made from animal skin through very complicated physical (mechanical) processing and chemical treatment. Yellow cowhide is the most common raw material for tanning, and there are certain differences among its various parts: in terms of thickness, the buttocks are the thickest, the abdomen is the thinnest, the neck is between the two, and the thickness of the buttocks is about the same as that of the abdomen. Twice the thickness; judging from the weaving of collagen fibers, the buttocks are the tightest, with a higher weave angle; the abdomen is looser, with a lower weave angle; the neck is between the two. In addition, there are certain differences between different animal skins. [0003] In leather production, however, the raw hide is treated almo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C15/00C14C3/22C14C3/16C14C3/08C14C3/06C14C11/00
CPCC14C3/06C14C3/08C14C3/16C14C3/22C14C11/00C14C15/00
Inventor 孙辉永陈华增温会涛牛泽贾喜庆梁永贤
Owner XINGYE LEATHER TECH CO LTD
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