A production method of double-sided leather and its special composite device

Abstract

The invention provides a method for producing double-sided leather and special compound equipment thereof. The method comprises the following steps: mixing polyvinyl chloride resin powder, a plasticizer DOTP, 5 parts of a stabilizing agent, 8 parts of a foaming agent and 0.8 part of a TPU modifier, and stirring at a high speed; adding the mixture into an internal mixer and an open mill for plastifying, adding the mixture into the special compound equipment to be compounded with the base after plastifying, foaming at a low temperature, cooling, and rolling, thereby obtaining the double-sided leather. The special compound equipment comprises a four-roller calender and cloth racks, wherein the two cloth racks are positioned at the rear end of the four-roller calender; the lower cloth rack is arranged below the fourth roller of the calender; the upper cloth rack is arranged above the third roller of the calender; and an angle of 45 degrees is formed between the upper base cloth and the third / fourth roller clearance plane. According to the double-sided leather obtained by the method and the special compound equipment, the bottom cloth and a polyvinyl chloride film are flatly attached, adhesion is avoided, the foam pores are fine and dense, the leather is high in handfeel elasticity and high in fastness, and the requirements on high-grade case liners are met.

Description

technical field [0001] The invention relates to the field of artificial leather, in particular to a production method of double-sided leather and a special composite device thereof. Background technique [0002] Genuine leather is a kind of natural leather processed from mammalian animal skin. It has the characteristics of good flexibility, strong air permeability, and relatively comfortable hand feeling. There are many kinds of genuine leather, but most of them are expensive, and require storage and care It is relatively high, so it is not suitable for popularization, and human beings hunt animals excessively for leather, which has also become the chief culprit of many animals becoming extinct or endangered; artificial leather is a kind of leather that looks and feels like real leather and can be used instead of it. plastic Articles, usually based on fabric, coated with Synthetic resin Ordinary artificial leather is cheap, bright and colorful, and has a variety of varieti...

AI Technical Summary

Problems solved by technology

[0002] Genuine leather is a kind of natural leather processed from mammalian animal skin. It has the characteristics of good flexibility, strong air permeability, and relatively comfortable hand feeling. There are many kinds of genuine leather, but most of them are expensive, and require storage and care It is relatively high, so it is not suitable for popularization, and human beings hunt animals excessively for leather, which has also become the chief culprit of many animals becoming extinct or endangered; artificial leather is a kind of leather that looks and feels like real leather and can be used instead of it. plastic Articles, usually based on fabric, coated with Synthetic resin Ordinary artificial leather is cheap, bright and colorful, and has a variety of varieties, but its comfort is not as good as genuine leather, and its air permeability, wear resistance and cold resistance are also poor, and it is easy to age and wear

[0003] Artificial leather can be divided into polyvinyl chloride, polyamide, polyurethane, polyolefin, etc. according to different materials; among them, polyvinyl chloride is currently the most widely used artificial leather, and it can be divided into single-sided and double-sided according to the number of layers of the base fabric. One type, single-sided type refers to a composite of a layer of base fabric and a layer of polyvinyl chloride plastic glue; double-sided leather refers to a composite of two layers of base fabric and a middle layer of polyvinyl chloride. The inner lining of luggage, but most of the double-sided leather on the market only pursues the thickness and does not pursue its physical properties. A lot of calcium powder is used in the ingredients, resulting in large cells in the double-sided leather, poor hand elasticity, and low fastness. , can only be applied to the lining of low-end bags, and it is difficult to meet the requirements of fine cells and good elasticity in the lining of high-end bags; at present, double-sided leather is usually produced by calendering, and a cloth frame is placed behind the calender for bottoming The cloth is compounded with the calendered polyvinyl chloride film to form a single-sided leather, and the single-sided leather is compounded with the base cloth again to form a double-sided leather. Uniformity affects the quality of the final product, and the location of the high-grade inner lining is more stringent than the current requirements. The original design of the low-grade double-sided leather fabric rack is difficult to meet the production requirements.

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