Preparation process of bovine blue wet leather

Abstract

The invention relates to the technical field of leather processing and provides a preparation process of bovine blue wet leather with a large leather area, broad growth patterns, great comprehensive performance and small environmental pollution. The bovine blue wet leather prepared by the preparation process of the bovine blue wet leather is large in width, broad in pattern, compact and fine in grain surfaces, consistent in color, uniform in thickness, soft, plump and elastic in leather body and high in physical strength. Moreover, the production process flow is simple and easy to implement, and the production cost is proper; in an implementation process, recycling of wastewater, preservation and removal of hair with less ash and sulfur, ammonia-free deashing and softening, salt-free pickling chrome tanning and other clean production technologies are also adopted. The water for tanning can be saved, the pollution of tanning is obviously reduced, the pollution disposal cost is lowered,considerable benefits of energy conservation and emission reduction are provided, and the preparation process is suitable for industrial production and use. The preparation process of the bovine bluewet leather specifically comprises the following steps of batching of bovine raw material leather, soaking in water, hair removal and expansion, beef removal, splitting, ash removal and softening, pretreatment, dewatering and peeling, soaking in acid and tanning with chrome and washing with water and discharging.

Description

technical field [0001] The invention relates to the technical field of tanning chemistry and engineering, in particular to a preparation process of bovine wet blue leather. Background technique [0002] Raw hides are the basic material of the tanning industry. The most common and the largest number of raw hides are three types, namely cowhide, sheepskin and pigskin. Among them, cowhide is the most important raw hide raw material resource for the world leather industry. The processing process from cow raw hide to cow wet blue leather is mainly: batching → pre-soaking → fleshing → main soaking → dehairing, liming → fleshing, splitting → deliming → softening → pickling → chrome tanning → wet blue Leather, the cow wet blue leather prepared by this conventional process, the grain wrinkles are often not fully opened, and the thickness uniformity is poor, making the processing process difficult to control, the loose surface rate is high, and there are often poor physical properties...

AI Technical Summary

Problems solved by technology

The processing process from cow raw hide to cow wet blue leather is mainly: batching → pre-soaking → fleshing → main soaking → dehairing, liming → fleshing, splitting → deliming → softening → pickling → chrome tanning → wet blue Leather, the cow wet blue leather prepared by this conventional process, the grain wrinkles are often not fully opened, and the thickness uniformity is poor, making the processing process difficult to control, the loose surface rate is high, and there are often poor physical properties The problem

In addition, in the conventional preparation process of bovine wet blue leather, ash-alkali depilation, ammonium salt deliming, salt pickling and other highly polluting technologies have been used, resulting in a large amount of waste water, Sludge, and contains high COD, sulfur ions, ammonia nitrogen, chloride ions, chromium ions and other pollutants, which is more harmful to the environment