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Through-type bath-free leather tanning method based on water jet technology

A technology of water jet technology, applied in small raw hide/big raw hide/leather/fur treatment, leather/skin/leather/raw hide chemical treatment equipment, small raw hide/big raw hide/leather skin/fur chemical treatment, etc., can solve the problem Solve the problems of limited tanning agent utilization rate and slow penetration, so as to avoid the generation of tanning waste liquid, reduce the dosage and improve the production efficiency

Active Publication Date: 2020-03-27
珍寿实业(商丘)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key of the present invention is to use the high-pressure jet technology to directly spray the tanning liquid into the skin fibers of the bare hides whose pH value has been adjusted by pickling and lye, so as to realize the bathless tanning of leather and solve the problem of traditional inorganic salt tanning. The tanning agent in the solid-liquid mass transfer process has the problems of slow penetration into the skin and limited utilization of the tanning agent in the bath liquid, as well as the production of a large amount of tanning waste liquid. The tanning method provided by the invention does not need the traditional mass transfer process, and can not only Fundamentally avoid the generation of tanning waste liquid, and the present invention can make the tanning agent sprayed into the leather fiber be It can enter the combination of bare hide and hide fiber in a short time, and further combine the tanning agent and hide fiber in the later stacking process. The tanning equipment takes a very short time, which is conducive to improving production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, the goatskin is tanned using the water-jet technology-based through-type bathless leather tanning method provided by the present invention, and the steps are as follows:

[0034] (1) Soak the pickled goat skin with a thickness of 0.8mm in the sodium bicarbonate bath, adjust the pH value of the pickled goat skin to 4.5, and then squeeze the water to the bare skin with a roller squeezer The water content is about 35wt.%.

[0035] (2) Lay the bare hide treated in step (1) on the conveying mesh belt in a single layer with the grain facing downward, and the conveying mesh belt moves at a constant speed of 0.2m / s, and the conveying mesh belt drives the bare hide horizontally Under the condition of uniform movement, the tanning solution containing 40g / L basic chromium sulfate (basicity is 38%) is evenly sprayed from the flesh surface of the bare hide in the form of high-pressure jets through the high-pressure nozzles arrayed above the conveyor belt To tan ...

Embodiment 2

[0040] In this embodiment, the sheep skin is tanned by using the bathless leather tanning method based on the water jet technology provided by the present invention, and the steps are as follows:

[0041] (1) Soak the pickled sheep skin with a thickness of 0.8mm in the sodium formate bath, then add sodium bicarbonate to the sodium formate bath, adjust the pH value of the pickled sheep skin to 4.8, and then use a roller Squeeze water with a water squeezer until the water content of the bare hide reaches about 30wt.%.

[0042] (2) Lay the bare hide treated in step (1) on the conveying mesh belt in a single layer with the grain facing downward, and the conveying mesh belt moves at a constant speed of 0.5m / s, and the conveying mesh belt drives the bare hide horizontally Under the condition of uniform motion, the tanning liquor of 30g / L basic chromium sulfate (basicity is 33%) is sprayed evenly from the flesh surface of bare hide to The bare leather is tanned on the bare leather, ...

Embodiment 3

[0047] In the present embodiment, cowhide is tanned using the water-jet technology-based through-type bathless leather tanning method provided by the present invention, and the steps are as follows:

[0048] (1) Soak the pickled cowhide bare hide with a thickness of 0.8 mm in a sodium carbonate bath, adjust the pH value of the pickled cowhide bare hide to 5.0, and then squeeze water to the bare hide with a roller squeezer. The water content is about 35wt.%.

[0049] (2) Lay the bare hide treated in step (1) on the conveying mesh belt in a single layer with the grain facing downward, and the conveying mesh belt moves at a constant speed of 0.4m / s, and the conveying mesh belt drives the bare hide horizontally Under the condition of uniform motion, the tanning solution of 40g / L basic chromium sulfate (alkalinity is 33%) is sprayed evenly from the flesh surface of bare hide to the The bare leather is tanned on the bare leather, and the jet velocity of the tanning solution is cont...

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Abstract

The invention provides a through-type bath-free leather tanning method based on a water jet technology, wherein the method comprises the following steps: (1) adjusting the pH value of pickled bare leather to 4.5-5.0 by using alkali liquor, and then adjusting the water content of the bare leather to 25 wt.%-40 wt.%; (2) tiling the bare leather treated in the step (1) on a transmission mesh belt ina single-layer manner in a grain surface downward direction, under the condition that the transmission mesh belt drives the bare leather to move horizontally at a constant speed, uniformly spraying atanning liquid prepared from an inorganic tanning agent to the bare leather from the meat surface of the bare leather in a high-pressure jet flow mode through high-pressure nozzles arranged above theconveying mesh belt in an array mode, so as to make the tanning liquid uniformly distributed in the bare leather to tan the bare leather, and controlling the jet flow speed of the tanning liquid to enable the tanning liquid to penetrate through the bare leather to reach the grain surface; and (3) stacking a leather blank treated in the step (2) for 24-48 h to finish tanning of the leather. According to the invention, bath-free tanning of leather is realized, and the problem of discharge of tanning waste liquid can be fundamentally solved.

Description

technical field [0001] The invention belongs to the technical field of leather processing and production, and relates to a through-type bathless leather tanning method based on water jet technology. Background technique [0002] The process of treating bare leather with tanning agents to convert it into leather is called tanning, and tanning is the most important process in leather processing. Compared with raw hides, leather or cooked hides have better resistance to heat and humidity, chemical resistance and biodegradation. The common tanning methods of leather can be divided into inorganic salt tanning, organic tanning and the combination of the two. At present, about 90% of the leather is tanned with basic chromium sulfate. The biggest advantage of chrome tanned leather is that the finished leather has high moisture and heat resistance stability. , Subsequent processing supporting materials are complete and the technology is mature. [0003] At present, the mechanical e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/04C14C3/06C14C15/00
CPCC14C3/04C14C3/06C14C15/00
Inventor 张宗才毛博王颖萱夏巧王兵
Owner 珍寿实业(商丘)有限公司