A kind of preparation technology of cow blue wet leather

Abstract

The invention relates to the technical field of leather processing, and provides a preparation process for bovine wetblue leather with large leather area, open growth lines, good comprehensive performance and low environmental pollution, and bovine wetblue leather produced through the bovine wetblue leather preparation process Large width, open texture, tight and fine grain surface, consistent color, uniform thickness, soft, plump and elastic leather body, high physical strength, and the production process is simple and easy to implement, and the production cost is appropriate. Wastewater is also used in the implementation process. Clean production technologies such as recycling, less ash, less sulfur, hair preservation and depilation, ammonia-free deliming and softening, and salt-free pickling and chrome tanning can save water for tanning, significantly reduce tanning pollution, reduce pollution treatment costs, and have good energy saving Emission reduction benefits, suitable for industrial production; the preparation process of cow wet blue leather specifically includes batching of cow raw hides → soaking → depilation, swelling → fleshing → splitting → deliming, softening → pretreatment → squeezing, flaking Leather → pickling, chrome tanning → washing, drumming.

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