A simplified color-changing process of two-layer cowhide

A two-layer cowhide and craftsmanship technology, applied in dyeing, textiles and papermaking, etc., can solve the problems of complicated operation, great influence on the quality of finished leather, and high cost, and achieve the effect of simple operation control, less material consumption, and good quality

Active Publication Date: 2017-06-09
CHINA LIGHT IND WUHAN DESIGN ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The previous fading process was rarely adopted by tanning enterprises due to its high cost, complicated operation, and great impact on the quality of finished leather.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1. Weigh the double-layer leather blank as the basis for the amount of water and other raw materials added in the subsequent process (the following are all based on the weight percentage of the double-layer leather blank). Throw the two-layer leather blank into the drum, and then go to step 2.

[0030] Step 2, return water

[0031] Add 45°C hot water of 300% of the weight of the two-layer leather blank to the drum, adjust the drum speed to 8rad / min, rotate for 90min, and drain.

[0032] Step 3, decolorization

[0033] Add 200% of the weight of the split leather at 50°C to the drum, then add 3% of the weight of the split leather to the weight of sodium carbonate, 6% of the weight of the split leather, sodium dithionite, turn Adjust the drum speed to 10rad / min, decolorize for 60min, wash with water until the floating color is removed, and drain.

[0034] Step 4. Retanning

[0035] Add 150% of the split leather weight of hot water at 30°C to the drum, then add 3% ...

Embodiment 2

[0045] Step 1. Weigh the double-layer leather blank as the basis for the amount of water and other raw materials added in the subsequent process (the following are all based on the weight percentage of the double-layer leather blank). Throw the two-layer leather blank into the drum, and then go to step 2.

[0046] Step 2, return water

[0047] Add 55°C hot water with 250% of the weight of the two-layer leather blank to the drum, adjust the drum speed to 8rad / min, rotate for 90min, and drain.

[0048] Step 3, decolorization

[0049] Add 150% of the split leather weight of hot water at 60°C to the drum, then add 2% of the split leather weight of sodium carbonate, 4% of the split leather weight of sodium dithionite, and adjust the drum speed to 10rad / min, decolorize for 60 min, wash with water until the floating color is removed, and drain.

[0050] Step 4. Retanning

[0051] Add 100% of the weight of the split leather blank at 40°C to the drum, then add 2% of the weight of ...

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PUM

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Abstract

The invention discloses a simplified process for changing the color of two-layer cowhide, which comprises the step of weighing the two-layer leather blank; the step of returning water; the step of decolorizing; the step of retanning; the step of dyeing; the step of expanding liquid; the step of fixing color; . The raw material of the present invention is a semi-finished leather base. Through scientific processing and reasonable control of process parameters, the decolorization degree of the leather base is high. After re-dying, the color is bright and uniform, soft and comfortable, and the leather board is strong without adverse effects on fiber strength. By decolorizing and retanning the semi-finished two-layer leather, the leather can be recolored, and the product is non-toxic and environmentally friendly; it can be applied to the secondary production of leather; it has opened up a new way for the secondary utilization of leather. Greatly enhance the flexibility and security of business operations, with significant economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of tanning technology, and more specifically relates to a simplified color-changing process of two-layer cowhide. Background technique [0002] After decades of rapid development, my country's leather industry has become a pillar industry of the light industry, and at the same time, my country has also become the world's first leather production and trade base. However, the international market is unpredictable, the domestic tanning industry is greatly affected by the international economic situation, and the financial crisis is still turbulent. Many tanneries have been hit hard due to customer order cancellations and inventory backlogs. In order to eliminate inventory and calmly respond to market changes, dyed leather blanks must be reprocessed to bring them back to the market. And the primary problem that occurs at this time is exactly the need to carry out good decolorization treatment to the semi-finish...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P3/32D06P1/00D06P1/673D06P1/52D06P1/653
Inventor 吴芍君
Owner CHINA LIGHT IND WUHAN DESIGN ENG CO LTD
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