Reducing leather and preparation method thereof

A technology of leather and leather materials, applied in the field of restored leather and its preparation, can solve problems such as unsuitable for commercial use, loose weaving, etc., and achieve the effect of wide application range, large leather and high grade

Active Publication Date: 2010-10-06
GUANGZHOU WUYUAN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese Invention Patent Application Publication CN1779002A discloses a collagen fiber reduced leather base cloth and its preparation method, which provides a method for effectively obtaining collagen fibers from leather and weaving it into a base cloth through non-woven technology. The base fabric obtained by the method already has a weaving structure similar to natural leather, but its weaving is loose, and the apparent density is only 0.25-0.3g / cm 3 , 500g / m 2 The tear strength of the base fabric is only about 8N. It is only a kind of base material and is not suitable for commercial use without further treatment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

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preparation example Construction

[0034] The core steps of the preparation of the restored leather in the present invention include defibration to prepare collagen fibers, netting, spunlace and shrinkage setting. Now describe the preferred specific implementation of each step.

[0035] Collagen fiber preparation: Put raw leather leftovers into a liquid opener for defibration. The liquid defibrillator can be self-made. It is equipped with at least one beater and carding fiber device in the container. The solution used in the liquid opener For water, according to the different leather materials, 0.5wt%-5wt% emulsified oil and 2wt%-5wt% defoamer can be added to the liquid according to the proportion of water. The reciprocating beating makes the fibers gradually loosen and separate and maintain a length range of 10-40mm. The separated fibers are pulled out by the carding device inside the machine and discharged out of the machine. The formed fibers are dried by equipment or naturally, and then opened by an existi...

Embodiment 1

[0042] (1) Collagen fiber preparation: put the chrome-tanned leather or its leftovers into a liquid opener (the device disclosed in the Chinese invention patent announcement specification CN 100545329C, the same below) for defibration. The solution used in the liquid opener is water, and 2wt% emulsified oil and 3wt% defoamer are added to the liquid in proportion to water. The fibers formed by defibration are dried by equipment or naturally, and then fully opened by the FA104 six-roller opener to obtain collagen fibers.

[0043] (2) Web forming: the collagen fibers obtained above are formed into 200g / m by K12 air-laid machine 2 collagen fiber network.

[0044] (3) Spunlace: Pass the above collagen fibers through one flat spunlace and five drum spunlaces, the spunlace pressures are 60bar, 150bar, 200bar, 100bar and 80bar respectively, so that the collagen fibers and their branches interpenetrate and interweave to form The net-like weaving structure very similar to leather is c...

Embodiment 2

[0049] Process Description:

[0050] The raw material is vegetable tanned genuine leather or its leftovers, which are defibered and wet-laid (100g / m 2 ), after spunlace, the spunlace leather material is obtained. The shrinkage temperature of the spunlace leather material is 80° C., and the steam heating is carried out by using a pass-through steamer to shrink the spunlace leather material, and the steam temperature is 85° C. The shrinkage temperature detection method is the same as in Example 1.

[0051] All the other processes are the same as in Example 1.

[0052] The weight of the restored leather processed by the above process steps is 230g / m 2 ±8%; apparent density 0.38g / cm 3 ; Tear strength ≥ 20N.

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Abstract

The invention discloses reducing leather and a preparation method thereof. The leather is mainly and three-dimensionally weaved by collagenous fiber obtained by defibrination of leather materials, and the apparent density thereof is 0.35g / cm3-1.4g / cm3. The preparation method of the leather comprises the steps: carrying out defibrination on the leather materials to prepare the collagenous fiber, forming web, carrying out hydroentanglement and wet-hot shrinkage and forming. The leather is reducing leather, the weaving structure, the apparent density, all strength indexes and wear resistance of which are approximate to those of true leather. Compared with the true leather, the reducing leather has the advantages that the leather is large and tidy and can be cut randomly, the weaving apparent density is consistent without location difference; and simultaneously, the raw materials of the reducing leather mainly adopt corner wastes in the leather-working industry. The promotion of the method can enhance the circulation and reutilization of resources in the leather-working industry, and is beneficial to realizing transformation from the traditional leather-working industry to the energy-saving and environment-friendly industry.

Description

technical field [0001] The invention relates to leather, in particular to a reduced leather and a preparation method thereof. Background technique [0002] The tanning industry has been born for many years. It uses the skins of animals to remove the flesh, depilate, and degrease, and then undergoes a series of chemical reactions through tanning, filling, dyeing, and fatliquoring processes, and finally becomes a certain acid-resistant leather. , Alkaline, hot and humid, yet soft and plump finished leather. The leather of animals is mainly woven from collagen fibers and a small amount of elastic fibers and reticular fibers. Collagen fibers account for about 95% of the total skin weight. The tanning process is actually to tan and modify the collagen fibers to make their chemical properties change. certain changes. [0003] The industrial utilization of animal skins is mainly for tanning. In the tanning process, there are various defects in the raw hides, such as scalding, fa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/46D01C3/00C14C3/02C14C9/02D06P3/32
CPCA61F13/00012C08L89/06Y10T442/3195D01C3/00D04H1/30D04H1/46D04H1/49
Inventor 张立文
Owner GUANGZHOU WUYUAN NEW MATERIAL CO LTD
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