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Waste leather renovating method

A leather and waste technology, applied in the field of refurbishment of waste leather, can solve the problems of not being able to get rid of the old and aging feeling, high toxicity, high labor intensity, etc., and achieve the effects of low toxicity in the production environment, recovery of sensory properties, and high production efficiency

Inactive Publication Date: 2013-03-20
东莞市德富皮革制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a process still has some problems as follows: 1) Simple solvent treatment is limited to some newly produced, non-cross-linked coated leathers, and is very difficult for some high-pressure ironed, embossed, strongly cross-linked, old leathers. Difficult to remove with simple solvent treatment; 2) The basic feature of leather fragments is small area, simple manual processing is not only labor-intensive but also low in efficiency, poor product uniformity, and low output; 3) Most old leather has a simple touch after simple painting and color change Bad, can't get rid of the old and aging feeling, and finally it's hard to get rid of the defects of low production process efficiency, high toxicity, and low product quality

Method used

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  • Waste leather renovating method

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Embodiment 1

[0041] A method for refurbishing waste and old leather, comprising a treatment agent deployment process, a leather pretreatment process and a leather renewing process, specifically:

[0042] Ⅰ. Preparation process of treatment agent

[0043] Calculated in parts by weight, mix 70 parts of water, 5 parts of low-carbon alcohol, 2 parts of low-carbon ether and 0.5 part of ammonia water, mix well and cool to room temperature to prepare the treatment agent; the water used is warm water with a temperature of 30±2°C .

[0044] Ⅱ. Leather pretreatment process

[0045] First put 1000kg of waste leather in a stainless steel container, pass hot air at 85°C into the stainless steel container, keep the relative humidity at 100%, and let it stand for 20 minutes;

[0046] Then, after cooling the heat-treated leather to normal temperature, transfer it to a drum with constant temperature and humidity. At the same time, add 10kg of warm water at 60±2°C and 5kg of the treatment agent formulated...

Embodiment 2

[0051]A method for refurbishing waste and old leather, comprising a treatment agent deployment process, a leather pretreatment process and a leather renewing process, specifically:

[0052] Ⅰ. Preparation process of treatment agent

[0053] Calculated in parts by weight, mix 72 parts of water, 6 parts of low-carbon alcohol, 3 parts of low-carbon ether and 0.6 part of ammonia water, mix well and cool to normal temperature to prepare the treatment agent; the water used is warm water with a temperature of 30±2°C .

[0054] Ⅱ. Leather pretreatment process

[0055] First put 100kg of waste leather in a stainless steel container, pass hot air at 88°C into the stainless steel container, keep the relative humidity at 100%, and let it stand for 25 minutes;

[0056] Then cool the heat-treated leather to normal temperature, transfer it to a drum with constant temperature and humidity, add 25kg of water at 60±2°C and 8kg of the treatment agent prepared in step 1 to the drum, and turn on...

Embodiment 3

[0061] A method for refurbishing waste and old leather, comprising a treatment agent deployment process, a leather pretreatment process and a leather renewing process, specifically:

[0062] Ⅰ. Preparation process of treatment agent

[0063] Calculated by weight, mix 72 parts of water, 6 parts of low-carbon alcohol, 3 parts of low-carbon ether and 0.7 part of ammonia water, and mix well to prepare the treatment agent; the water used is warm water with a temperature of 30±2°C.

[0064] Ⅱ. Leather pretreatment process

[0065] First put 1000kg of waste leather in a stainless steel container, pass hot air at 90°C into the stainless steel container, keep the relative humidity at 100%, and let it stand for 24 minutes;

[0066] Then cool the heat-treated leather to room temperature, transfer it to a drum with constant temperature and humidity, add 30kg of warm water at 60±2°C and 10kg of the treatment agent prepared in step 1 to the drum, and turn on the drum for 4 hours Finally, ...

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Abstract

The invention relates to the technical field of leather manufacturing, in particular to a waste leather renovating method. The method comprises a treating agent blending procedure, a leather pretreatment procedure and a leather renovation procedure, and comprises the following concrete steps: on the basis of not damaging the leather body, destroying the original cured, cross-linked, waterproof and wearable coatings on the waste leather by using a semi-solvent mode as well as mechanical forces; and then, carrying out recovery treatment on the pretreated leather by using a scrap leather cleaning machine, a special scrap leather scalding machine and a scrap leather spraying machine, thus obtaining the renovated leather. The invention has the advantages of low cost and high production efficiency, and the renovated leather is similar to newly-produced leather in appearance and hand feeling.

Description

technical field [0001] The invention relates to the technical field of leather manufacture, in particular to a method for refurbishing waste leather. technical background [0002] Light industry is an important pillar industry in my country, and leather is the main export product of light industry products. my country is a big leather manufacturing country, and it is also a big consumer of leather products. Every year, there are nearly 5,000 tons in my country, and nearly 20,000 tons in Europe and the United States of leather scraps and waste leather products due to furniture manufacturing or waste. Judging from the waste leather acquired in the past five years, 1 / 3 of them can be directly used for surface sensory correction and reuse; 1 / 3 needs to be processed by physical-chemical treatment before surface sensory correction and reuse; 1 / 3 It needs to be crushed and compounded to regenerate. What's more noteworthy is that the world's leather production is increasing at a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C9/00C14C9/02C14B1/54C14C11/00
Inventor 单志华李翎陈蔓玲周成飘
Owner 东莞市德富皮革制品有限公司