Retanning process of environmentally friendly vegetable tanned elastic leather products

Abstract

The invention belongs to the technical field of production of elastic leather products, and discloses a retanning process of an environmentally friendly vegetable tanned elastic leather product, comprising the following steps: 1) backwatering the elastic leather skin; 2) retanning; 3) dyeing ;4) Fatliquoring; 5) Mounting, squeezing water, hanging to dry; 6) Spraying water on the surface of the board, standing still, breaking down to soften; 7) Piecing: peel the skin to a thickness of 0.2mm; 8) Adhesive; 9) 10) Put on a horse, squeeze water, hang to dry; 11) Spray water on the surface of the board, let it stand still, and break it to soften. The vegetable tanned elastic leather clothing product processed by the processing technology of the invention maintains good elasticity, skin strength, thinness and uniformity.

Description

technical field [0001] The invention belongs to the technical field of production of elastic leather products, and in particular relates to a retanning process for environmentally friendly vegetable tanned elastic leather products. Background technique [0002] Regarding the production of vegetable tanned elastic leather apparel products, there are currently two main problems: ①Pure vegetable tanned leather has a big defect in that its physical properties are not high, and its tensile and tear resistance is poor, while elastic leather requires a high High elongation performance, and requires subsequent skins to be very thin to achieve good uniformity, which brings great challenges to the water retanning process, and retanning must be used to improve the uniformity and strength of the skin;② Stretch leather requires a uniform thickness, mostly kept at 0.2 mm. On such a thin and light basis, it is necessary to maintain high elasticity, which poses a great challenge to the accu...

AI Technical Summary

Problems solved by technology

[0002] Regarding the production of vegetable tanned elastic leather apparel products, there are currently two main problems: ①Pure vegetable tanned leather has a big defect in that its physical properties are not high, and its tensile and tear resistance is poor, while elastic leather requires a high High elongation performance, and requires subsequent skins to be very thin to achieve good uniformity, which brings great challenges to the water retanning process, and retanning must be used to improve the uniformity and strength of the skin;② Stretch leather requires a uniform thickness, mostly kept at 0.2 mm. On such a thin and light basis, it is necessary to maintain high elasticity, which poses a great challenge to the accuracy of the leather sheeting machine.

[0005] Even if the above-mentioned technical means are adopted, the prior art still has the following disadvantages: ①The treatment effect is not good, the tear resistance of the leather is average, and the hygienic performance of the leather body is not good. It is difficult to effectively solve the physical properties of the leather only by combining tanning with chrome powder. Insufficient problem, after many production verifications, even if the conventional combined tanning methods such as "chrome-aluminum", "plant-chrome" and "aldehyde-chrome" are adopted, the finished elastic leather will still have a certain proportion of leather body strength Poor problem, which will affect the customer's wearing experience; ②The process is lengthy, requiring smoothing and grinding processes to further thin the leather, which increases production costs and prolongs the production cycle; ③Adding chromium-containing materials in the retanning process can Improve the performance of the finished product, such as leather fullness, softness, waterproof performance, etc., but at the same time cause environmental and safety hazards. One is that chromium-containing waste cannot be effectively treated, which is harmful to the environment; the other is chrome-tanned leather products. Contains trace amounts of hexavalent chromium, long-term wearing safety cannot be guaranteed

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