Making technology of natural dry milled leather

Abstract

The invention relates to the technical field of making technologies of leather, and provides a making technology of natural dry milled leather. The making technology of the natural dry milled leather shortens the production time, improves the plumpness and uniformity of the pattern of the natural dry milled leather and enlarges the application range of leather sources through physical technologies. The making technology of the natural dry milled leather comprises the following steps: preparing wet blue leather, selecting, squeezing and spreading, weighing, returning the wet blue leather to a drum and immersing the wet blue leather in water, squeezing and spreading, carrying out vacuum treatment, drying, rinsing and neutralizing, carrying out closed washing, filling and dyeing, fatliquoring, carrying out color processing, washing by using water and discharging the obtained leather from the drum, carrying out stacking standing, squeezing and spreading, carrying out vacuum treatment, naturally hanging for airing, spraying water to regain moisture, standing, carrying out vibration softening, milling, and finishing.

Description

technical field [0001] The invention relates to the technical field of leather production technology, in particular to a production technology of natural grain leather. Background technique [0002] At present, many companies have their own unique natural wrestling leather production technology. Li Lin of Sichuan Dawei Technology Co., Ltd. selects low-grade leather, uses acid enzymes to soften the blue leather, and uses conventional processes to retan, dye, and fatliquify. Methods The natural shattered sofa leather is produced, and the obtained leather can meet the requirements of the sofa leather with a high yield. Zhang Yong of Mingzhong Trading Co., Ltd. selects thick blue leather without slices. After smoothing, weighing, rewetting, rinsing, chrome retanning, neutralization, dyeing and oiling, fixing, wet stretching, breaking and coating, Production of thick full grain natural tumbled sofa leather. However, the process of these natural wrestling leathers is more compl...

AI Technical Summary

Problems solved by technology

However, the process of these natural wrestling leathers is more complicated, the production cycle is long, and the cost is high.

On the other hand, the existing natural falling process mostly opens the fibers by strengthening the method of rewetting and softening and wet stretching. Although this can make the fibers fully loose, it is also easy to cause the defects of loose surface or damaged grain surface. There are problems such as long production cycle, low fullness and uniformity of patterns, strong selectivity of process to leather source, etc.