Natural milling and coating process for high-grade nappa elastic leather

Abstract

The invention belongs to the technical field of leather processing, and particularly relates to a high-grade nappa elastic leather natural milling and finishing process which comprises the following procedures: toggling fixing, wax sealing, standing, primary milling slurry spraying, primary ironing, secondary milling slurry spraying, secondary ironing, cold milling, color repairing, hand feeling agent spraying and tertiary ironing. Through the bottom coating wax sealing technology, the problems of environmental pollution and inconvenient operation of a solvent type bottom sealing agent are solved, a natural sealing layer is built for the surface of the crust and serves as connection between the elastic crust and a dry-milling slurry layer, and the natural wax feeling of the crust is remarkably improved; and through the floating coat and milling technology, the grade utilization rate of the elastic crust leather is greatly improved, and the coating and milling style is changed from an uncontrollable coating style to a coating style with extremely high controllability. The two technologies are combined, so that the problems of low grade utilization rate, poor style attractiveness and environmental pollution of the elastic leather are effectively solved, meanwhile, the coating thought of the elastic leather is diverged, and the application value of the product is further improved.

Description

technical field [0001] The invention belongs to the technical field of leather processing, and in particular relates to a high-grade napa elastic leather natural drop pattern finishing process. Background technique [0002] Regarding the production of elastic leather, because of its high elasticity, it has a broad market and is favored by domestic and foreign consumers. However, the finishing technology is also limited by its high elongation, resulting in a monotonous product style. The inability to produce high-quality and aesthetically pleasing finished products has resulted in the dilemma that the leather industry has its own characteristics, but cannot produce good finishing products. The problems faced are: ①The elongation rate of the elastic leather embryo is large, and the conventional coating technology often has the problem of stretching and leakage; The coating is harsh, resulting in poor style and hand feeling; ③The physical properties are not up to standard, and...

AI Technical Summary

Problems solved by technology

[0002] Regarding the production of elastic leather, because of its high elasticity, it has a broad market and is favored by domestic and foreign consumers. However, the finishing technology is also limited by its high elongation, resulting in a monotonous product style. Can't produce high-quality and beautiful finished products, resulting in the dilemma that the leather industry has its own characteristics, but can't produce good finishing products

The problems faced are: ①The elongation rate of the elastic leather embryo is large, and the conventional coating technology often has the problem of stretching and leakage; The coating is harsh, resulting in poor style and hand feeling; ③The physical properties are not up to standard, and the wet and dry wiping performance of the finished product, formaldehyde content, etc. are difficult to handle; Good style, so low sorting rate, resulting in high cost of stretch leather

[0007] ① Excessive reliance on sorting, which consumes manpower and working hours, also leads to a low sorting rate of leather embryos suitable for high-end products; for poor-grade leather, the surface is trimmed to make NUBUCK leather, which reduces the value of the product and causes a load on the environment. It can fundamentally improve the grade utilization rate of products;

[0008] ② At the cost of repainting, the style and feel of the product are sacrificed. Too much application of pigment paste, repair paste, and resin will increase the production cost, but the manufactured product is low-grade elastic leather, and the product is not competitive.

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