The Main Methods Of Shoe Shoe Leather Printing Technology Are Analyzed.

< p > < strong > 1. dye printing < /strong > < /p >

< p > although the progress of textile printing and dyeing technology provides technical support for leather printing, leather can not be steamed at high temperature.

For this reason, there are a series of leather dyestuffs used abroad, mainly 1:2 type metal complex dyes. Since these dyes are printed, the leather plates do not need to be steamed and fixed. As long as they are dried, they can finish the printing task. For example, the "Sellaseth" series produced by Swiss Ciba Co., Ltd. is widely used in leather printing. However, the disadvantages of these dyes are high price and low strength, only about 30% to 50% of ordinary dyes.

With the continuous improvement of dyeing performance of leather, some special dyes for leather have appeared.

Leather fiber is different from ordinary fabric and other protein fibers. It has strong charge and various dyes also show great differences in leather affinity.

In the dyeing of the tannin leather, the depth of the chrome tanned leather is uneven, which obviously affects the color of the dyestuffs.

Therefore, some dyestuffs used in leather dyeing are often not satisfactory, and the fastness of dyeing is also poor.

This has promoted the development of special dyestuff for leather. In recent years, its varieties and quantities have increased greatly, and its tone is mainly black and brown in leather.

The ideal dye for leather can be dyed at room temperature and has good solubility and permeability. Dyed different leather can get the same color, good levelling and good fastness.

At present, special dyes for leather are usually selected from other dyestuffs and some suitable dyes are selected.

Therefore, there are many kinds of dyes in structure, including almost all kinds of dyes, including azo type (acid, straight) and metal complex dyes as the main body, especially the application of metal complex dyes in leather.

A series of dyestuffs selected from textile dyestuffs are of the same fastness as imported ones. They are brightly coloured and high in strength. However, their fastness to light is slightly worse. They can be dried after printing on leather and do not require steaming or washing.

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< p > shoes shoes leather printing dyes should be considered when choosing the following points.

Dyeing properties of dyes.

When the screen printing is done, the dyes with similar dye properties should be selected for coloring, so that their affinity and diffusion rate to leather fibers are very small, and the color and light can be effectively controlled.

The levelness is close.

If one of the dyes is too strong for the skin plate fiber and the diffusion rate is low, the migration of the dye will become worse. This phenomenon will inevitably result in the use of levelling agent.

Dyeing performance of dyes.

Generally speaking, dyes with good dyeing performance can be used to dye dark colored flowers. If the dyeing is poor, they can only print light colored flowers.

(4) staining fastness.

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< p > < strong > 2. pigment printing < /strong > < /p >.

< p > pigment printing is the largest printing method of leather printing. Pigment printing uses polymer compounds to form films on leather, because pigment printing can also stick pearls, gold and silver powder and pigments onto leather, which is capable of covering defects or uneven dyeing of some leather leather. Printing products can be changed into a wide variety of products, which can maximize the performance of leather's noble and gorgeous features.

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< p > < strong > 1) < a href= > //www.sjfzxm.com/news/index_c.asp > > printing > /a > process > /strong > /p >

< p > printing process < /p >

< p > spray (brush) platen glue, one skin, one screen printing, one hanging, one drop, one soft grading, one ruler storage, color paste formula and material paste formula < /p >

< p > CMA paste powder 200 g < /p >

< p > water 950 g < /p >

< p > emulsifier 50 g < /p >

< p > defoaming and homogeneous U 230 g < /p >

< p > preparation operation < /p >

< p > pour the weighing water into the mixing drum, start the blender (speed n>1 200r/m), knead the CMA powder into the barrel slowly, and add emulsifier and defoamer in turn, stirring and stirring for 30 min.

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< p > printing pigment formulation < /p >

< p > Paste 800 g < /p >

< p > resin (medium soft) 200 g < /p >

< p > thickener 30O g < /p >

< p > oN (Ruan Shuzhi) 100 g < /p >

< p > appropriate amount of paint (if printed pearlescent powder can be added to 100 g).

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< p > pigment formulation operation < /p >

< p > weighing in accordance with the above order, pour into the mixing barrel and stir evenly.

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< p > < strong > 2) the printing process of shoe leather is < /strong > < /p >.

< p > spray the water based platen glue on the screen printing machine platen, evenly spray and brush on the printing table.

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< p > paste: first of all, the leather is intact and colorless. The same batch of leather is arranged according to the size of the original leather, from small to large, and the screen printing decoration is mainly made of shoes and boots.

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< p > printing: first start from the first leather, print in order, and if there is still slurry on the screen, use the knife to recover the remaining pulp, then use it again after mixing.

A large area of flower pattern is usually printed 3 times, and small patterns can be scraped two times.

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< p > scratching and uncovering: hang up the air. At this time, the pigment can be fully absorbed by the leather and hanged until it is not sticky.

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< p > soft: put some material such as rubber ball in the drum, time (10~15) min, speed 17 r/min.

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