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Method for improving flexibility of yak decorative fur/leather cutis plate by acid swelling and splitting

A technology of acid swelling and softness, which is applied in the field of leather and fur manufacturing, and can solve the problem that the loosening or lubricating effect of leather collagen fiber bundles cannot be fully exerted, the improvement of the softness of yak decorative fur leather board is not significant, and the problem of yak decorative fur leather Hard board and other problems, to achieve the effect of easy implementation, increased equipment investment, and low cost

Inactive Publication Date: 2012-12-05
西藏自治区拉萨皮革厂 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when these conventional processes that can improve the softness of fur leather panels are directly used in the production of yak decorative fur leather, there are the following problems: ① Due to the thickness of yak leather panels, and there is no piece in the production process of conventional yak decorative fur leather Therefore, the thickness of the leather board cannot be reduced, making it difficult for the materials used in these chemical methods, that is, enzyme preparations, acids or fatliquoring agents, to penetrate completely and evenly into the yak decorative fur leather board, so it is impossible to fully exert the effect of these materials on the leather board. The loosening or lubricating effect of collagen fiber bundles, therefore, the obtained yak decorative fur leather board is still relatively hard
②In the softening process such as drum softening, although mechanical beating can be used to improve the softness of yak decorative fur leather panels to a certain extent, however, due to the dense and long hair of yak fur, in order to prevent hair knots Balls will damage the aesthetics of the fur quilt. The mechanical force applied in these softening processes should not be too large. Therefore, the effect of improving the softness of yak decorative fur leather panels is not significant.

Method used

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  • Method for improving flexibility of yak decorative fur/leather cutis plate by acid swelling and splitting
  • Method for improving flexibility of yak decorative fur/leather cutis plate by acid swelling and splitting
  • Method for improving flexibility of yak decorative fur/leather cutis plate by acid swelling and splitting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 5 pieces of yak hides that have been soaked in water, degreased and combed into the drum, add water with a liquid ratio of 10 at 20°C, and rotate for 30 minutes; then add sodium chloride and anhydrous sodium sulfate with a mass ratio of 1:1 to make The concentration is 10g / L, and then rotate for 30 minutes; then add formic acid in 4 times at 1.5g / L, 1.0g / L, 1.0g / L, 1.0g / L in unequal parts, each interval is 1.5 hours, Make the final concentration 4.5g / L, during which the drum rotates; after that, the drum rotates at a speed of 4r / min, and stops for 50min every 10min, until the total time of acid swelling reaches 48 hours; the yak hide is taken out from the drum, according to the routine The yak decorative fur fur processing technology carries out combing and finishing, and then performs skinning and controls the thickness of the leather board after the skinning to be 70-75% of the initial thickness of the leather board; after that, conventional follow-up processing ca...

Embodiment 2

[0024] Put 5 pieces of yak hides that have been soaked in water, degreased and combed into the drum, add water with a liquid ratio of 8 at 25°C, and rotate for 30 minutes; then add sodium chloride to make the concentration 10g / L, and rotate for 30 minutes; Then add formic acid in 3 times in equal parts, with an interval of 1 hour between each time, so that the final concentration is 3g / L, during which the drum rotates; after that, the drum rotates at a speed of 4r / min, and stops for 50min every 10min until the acid expands. The total time reaches 24 hours; the yak skin is taken out from the drum, combed and finished according to the conventional yak decorative fur processing technology, and then the skin is sliced ​​and the thickness of the skin after the skin is controlled to be 80-85% of the initial thickness of the skin; Afterwards, conventional follow-up processing can be carried out.

Embodiment 3

[0026] Put 5 pieces of yak hides that have been soaked in water, degreased and combed into the drum, add water with a liquid ratio of 9 at 25°C, and rotate for 30 minutes; then add potassium chloride to make the concentration 7.5g / L, and rotate for 30 minutes ; Then add formic acid in 5 times in equal parts, with an interval of 1 hour between each time, so that the final concentration is 5g / L, during which the drum rotates; after that, the drum rotates at a speed of 3r / min, and stops for 50min every 10min until the acid The total expansion time reaches 36 hours; the yak skin is taken out from the drum, combed and finished according to the conventional yak decorative fur processing technology, and then the skin is sliced ​​and the thickness of the skin plate is controlled to be 80-85% of the initial thickness of the skin plate ; Thereafter, conventional follow-up processing can be carried out.

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Abstract

The invention discloses a method for improving the flexibility of a yak decorative fur / leather cutis plate by acid swelling and splitting. In the method, acid swelling, combing, tidying and splitting are sequentially carried out after a degreasing procedure in the conventional production of a yak decorative fur / leather, wherein acid swelling liquid used in the acid swelling procedure is prepared from the following materials: 2-5g / L of acidic materials, 5-15g / L of acid swelling regulator and water as the solvent; and the control process parameters are as follows: the temperature is 20-30 DEG C, the rotation speed of a rotor drum is 3-6r / min, the liquor ratio is 8-10, and the time is 24-48 hours. The invention breaks with convention to skillfully make use of the acid swelling regulator to carry out splitting under the condition that collagen fibers of the cutis plate are moderately swollen, loosened and increased in thickness by the acidic materials, so that the thickness of the cutis plate is greatly decreased, the uniformity of the cutis plate is improved, and the penetration of chemical materials in subsequent procedures as well as the dispersion or lubrication effect of the chemical materials on the collagen fibers of the cutis plate is promoted, and therefore, the flexibility of the yak decorative fur / leather cutis plate is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of leather and fur manufacture, and relates to a method for acid-swelling and peeling yak hide in a conventional production process of yak decorative fur to improve the softness of a yak decorative fur board. Background technique [0002] my country's yak leather output accounts for 85% of the world's output, and it is an important resource for my country's leather industry. Yak leather has the characteristics of long hair, thick and thick coat, large sheet width and high strength. It is an excellent raw material for decorative fur leather. [0003] With the improvement of people's living standards, the requirements for yak decorative fur products have been developed towards the direction of beautiful fur quilt, soft, plump and elastic leather board. There is a big difference in weaving tightness, and there are often large pieces of oil on the skin, which brings great difficulties to the production of yak f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/08C14B1/02
Inventor 陈武勇龚英张涛左秋马成义陈小云肖烈忠
Owner 西藏自治区拉萨皮革厂
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