Manufacturing process of semi-vegetable tanned wrinkled leather of cow leather

A production process, semi-vegetable tanning technology, applied in the direction of leather impregnation, leather softening, leather drying, etc., to reduce the content of chromium, reduce pollution, and improve added value.

Inactive Publication Date: 2011-06-01
锦兴皮业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects existing in the existing cowhide tanning process, and provide a new manufacturing process of cowhide semi-vegetable tanned grain leather, the technical problem to be solved is to make it tanned with a small amount of chrome tanning agent first, Then use vegetable tanning agent to tan the raw hide, under the premise of ensuring the quality of leather, the content of chromium in the tanning waste liquid is greatly reduced, and the pollution of chromium to the environment is reduced; at the same time, the vegetable tanning agent in the leather can also effectively prevent six Valence chromium production, very suitable for practical

Method used

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specific Embodiment approach

[0027] In order to further elaborate the technical means and effects adopted by the present invention to achieve the intended purpose of the invention, the specific implementation methods, methods and steps of the production process of cowhide semi-vegetable tanned tumbled leather proposed according to the present invention will be described below in conjunction with preferred embodiments. , features and their effects are described in detail below.

[0028] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed descriptions with preferred embodiments. Through the description of specific implementation methods, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained.

[0029] The production process of cowhide semi-vegetable tanned tumbled leather in a preferred embodiment of the present...

Embodiment 1

[0041] 1. Initial tanning: At room temperature, add 4% chrome tanning agent to the weight of the limed hide in the pickling solution in the drum with a water content of 70% of the weight of the limed hide, and rotate the drum for 2 hours; Sodium acetate of 1% of the weight of gray skins, rotating the drum for 1 hour; continue to add 1.5% baking soda for the weight of gray skins in 4 times, wherein the time interval between adding baking soda every two times is 30 minutes, so that the rotating drum Adjust the pH value of the liquid in the drum to 3.8-4.0, and then rotate the drum for 2 hours; then stop the rotation of the drum and let it stand for 18-20 hours; and then turn the drum again for 30 minutes, then take the blue skin out of the drum and let it rest Set for 24 hours.

[0042] 2. Deacidification: Put the initially tanned blue skins into the drum again, add 150% water of the weight of the limed skins, and add 1% of the weight of the grayed skins to the drum at room temp...

Embodiment 2

[0050] 1. Initial tanning: At room temperature, add chrome tanning agent with 5% weight of liming hide in the pickling solution in the drum with the water content of 70% of the weight of liming hide, and rotate the drum for 3 hours; 1.5% sodium acetate by tare weight, and rotate the drum for 2 hours; continue to add 1.5% baking soda for liming skin weight in 4 times, wherein the time interval between every two additions of baking soda is 30 minutes, so that the drum Adjust the pH value of the inner liquid to 3.8-4.0, and then rotate the drum for 3 hours; then stop the rotation of the drum, and let it stand for 18-20 hours; and then turn the drum again for 30 minutes, take the blue skin out of the drum, and let it stand 48 hours.

[0051] 2. Deacidification: Put the initially tanned blue skins into the drum again, add 150% water of the weight of the limed skins, and add 1.5% of the weight of the grayed skins to the drum at room temperature. Sodium metabisulfite and For the sod...

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Abstract

The invention relates to a manufacturing process of the semi-vegetable tanned wrinkled leather of cow leather, which comprises the working procedures of initial tanning, deacidifying, vegetable tanning, filling and dry finishing. In the method provided by the invention, firstly tanning is carried out on raw hide by a small quantity of chromium tanning agent and then by a vegetable tanning agent, thereby under the premise of guaranteeing the quality of the leather, greatly reducing the content of chromium in tanning waste liquid, lightening the pollution of the chromium to the environment and effectively inhibiting the generation of hexavalent chromium through the vegetable tanning agent in the leather; and meanwhile, the granule surface of the leather is tightened through the working procedures of dry finishing and coating, and natural winkles are formed on the granule surface, thereby covering the injury of the granule surface of the leather and improving the additional value of the leather.

Description

technical field [0001] The invention relates to a production process of cowhide in the leather industry, in particular to a production process of cowhide semi-vegetable tanned tumbled leather. Background technique [0002] Tanning is a key process in leather production. After the tanning process, the raw hide protein is cross-linked and denatured to obtain properties such as moisture and heat resistance and resistance to microbial action, and the raw hide structure undergoes a qualitative change to become a valuable leather. Tanning agent is a leather chemical material that completes this qualitative change. Among all tanning agents developed by human beings, chrome tanning agent has been occupying a dominant position for more than one hundred years after its advent due to its superior tanning performance. An essential tanning material in modern tanning production. Chrome tanned leather has good moisture and heat stability, softness and plumpness, and good formability, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/04C14C3/10C14C3/28C14C9/02C14C9/00C14C1/00C14B1/58C14B1/40C14C11/00
Inventor 许连来张永兵陈杰
Owner 锦兴皮业科技有限公司
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