Method for making flexible dry milled leather through low-grade wet blue leather

Abstract

The invention relates to the technical field of leather making process, and provides a method for making flexible dry milled leather through low-grade wet blue leather. The method comprises the stepsof water squeezing shaving and weighing of the selected low-grade wet blue leather, softening and rising, washing, neutralizing, washing, grease adding, washing, drum outlet standing, water squeezingextension, primary hanging airing drying, softening, dyeing, washing, color registering, washing, surface treatment, washing, drum outlet standing, water squeezing extension, secondary hanging airingdrying, flesh side water spraying and standing, vibration staking, milling and coating. On the basis of the traditional process, three procedures of retanning, filling and vacuum drying in the after-tanning wet machining segment can be removed, the whole operation flow is short, the method is suitable for large-batch production use, the cost is reduced by 30%, the leather yield is increased by 20%, the leather hand feeling is soft and light, the leather body is rich and elastic, the pattern is full and uniform, and the utilization rate is high.

Description

technical field [0001] The invention relates to the technical field of tanning technology, in particular to a method for making soft tumbled leather by using low-grade wet blue leather. Background technique [0002] Low-grade wetblue leather refers to wetblue leather with defects or disabilities such as loose surface, thorn scratches, and blood tendons on the grain surface. The causes of low-grade wet blue leather can be specifically divided into: ①The animals are produced during the growth period or after slaughtering, such as horsefly bites, abrasions, ringworm, branding, etc. formed during the growth period of the animals, and the tracing knife produced after the animals are slaughtered ②Improper treatment process from raw hide to wet blue leather, such as insufficient soaking and liming resulting in obvious blood tendons, improper control of temperature and mechanical action during soaking and liming, improper fleshing operation, etc. face serious. The existence of the...

AI Technical Summary

Problems solved by technology

However, the oil in wet blue leather is almost completely removed in the pre-tanning preparation process, and with the loss of moisture in the leather, the collagen fibers are bonded together, the mobility is reduced, the hand feeling becomes stiff, and the softness is extremely low.