Fur Printing Technology

Fur printing

It is the process of forming a color pattern on fur by means of dye or paint with the aid of physical and chemical reactions. For example, rabbit skin, Rex rabbit skin, goat skin and sheep shearing leather can be used to imitate leopard cat, leopard, tiger stripes and other patterns of movement or plant, which can be used for making collar, hat, clothing, trimming, etc.

These printing products are well received at home and abroad.

Fur printing has machine printing and hand printing. This article focuses on manual printing. The main tools are printing plate, push roll (or scraper) and brush.

The production of printed boards requires a large metal frame or plastic frame or a wooden frame to be stretched on nylon net or polyester wire net. There are patterns in the silk screen with hollowed out mesh and polyurethane coated with no pattern.

When printing, the color paste is scratched over the mesh and printed on the fur. In order to reduce the cost, it can also be carved into hollow plates with materials such as tinplate, zinc plate and plastic board.

When printing, the printing plate will be covered on the fur, and the brush will be dipped into the color paste, and then be painted on the printing plate to obtain the desired pattern pattern on the fur.

The size of the printing plate depends on the product. Large printing plate is similar to the size of fur pits (120cm*62cm). It can also be used as a printed sheet for rabbit skin.

Imitation tiger stripes need to be dyed first and then make a single color paste. The Panthers also need to dye the base color first. They need two kinds of color paste, two printing plates (flower core board, black circle plate). The flower like heart is pink or coloured, and the leaves are green or black. Whether the center color or outer ring color, the pigment material consists of dyes (or), paint, paste, auxiliaries, hair keeping agents, chromogenic agents and fixing agents.

1. Printing category

1.1 direct printing

1.1.1 screen printing

Use low humidity dyes, such as oxidation dyes, TIPPING DYES and BRUSHING DYES, to print on the woolen cloth through double plates or veneers.

1.1.2 engraving printing

Cover the coat or the skin plate with the printing plate, and brush the prepared slurry with a brush on the fur.

One point two

The printing plate is covered on the woolen blanket, and the bleaching solution is prepared from H2O2, ammonia water, wool retaining agent and auxiliaries.

One point three

1.3.1 was dyed with acid dye by LOWACENE DYES, LOWACENE ASSIST BH, LEVEL A, formic acid and water. The temperature was 60-65 degrees Celsius, time 2h..

1.3.2 covered the printing plate with dye coated wool.

BLEACH LCN-1 or LCN-3110g.

Formic acid 400ml Water 500ml

The white liquid is painted or sprayed on the hollowed out board.

1.4 glossy wool printing

On the smooth leather surface, the liquid (direct dyes, metal complex dyes, resins, etc.) will be printed with brush or spray method.

1.5 roller printing

Produce uneven patterns (regular or irregular) on the leather surface by means of a flower plate or embossing machine, such as

And the lizard pattern.

1, 6 pfer printing

First print the paste onto the paper and print it into pfer paper. Then the front side of the pfer paper will be tightly bonded to the surface and press at a certain temperature and pressure for a certain time to pfer the flower shape on the surface.

2.

Screening

Generally speaking, the following points should be taken into account when choosing printing dyes.

(1) color matching properties of dyes

When printing, dyes must be chosen to match the color, which means that there is not much difference between the affinity and diffusion rate of the skin fibers, so that the color light can be controlled effectively.

(2) leveling performance

Relatively speaking, a certain dye has greater affinity on the skin fiber, lower diffusion rate and poor mobility, which will inevitably cause levelling agents to solve the levelling problem.

When printing, this problem is not significant, as long as we consider leveling dye.

(3) fastness indicators

Acid dyes, oxidizing dyes, TIPPING DYES and BRUSHING DYES have different printing effects on woolen fabrics. If acid dyes are not able to meet their requirements due to temperature and other conditions, dye can not be diffused inside the fibers to produce internal bonds, but can only be adsorbed on the surface of the wool fibers. The indicators of the fastness can not be used at all. Therefore, it is not suitable to use the oxidation dyes and TIPPING DYES to combine with wool fibers at low temperature and suitable for fur printing.

(4) dye uptake

Dye dye can be printed in dark colors. On the contrary, it can only print light colors. The neutral dye has a large component. It combines with the amino acid of the skin fiber. Besides relying on the salt bond, it also relies on hydrogen bonding and Fan Dehua force, so it can be used to print the dark color.

To sum up, for leather printing, it is better to use direct dyes or liquid plus Sora dyes.

For wool printing, only ammoniated dyes, TPPING DYES and BRUSHING DYES can be used.

3. Screening of paste.

The printing paste is closely related to the printing effect. The selected paste should meet the following requirements: the paste and dye, the compatibility of the auxiliaries are better, the dispersing property of the paste in water is large, the water content of the paste is small, the paste is good for the adhesion of the fiber, the paste should be moderately wetted, and the washing property of the paste is better.

In the printing paste, a certain amount of paste must be added. Its function is to pfer the chemical materials such as dyes and auxiliaries to the skin to prevent the percolation of the pattern.

When the color is fixed, the paste is easy to wash away.

There are many varieties of printing paste, so it is necessary to optimize the paste that can meet the printing process requirements.

In dyeing, water is the disperse medium of dyes. In printing, paste becomes the disperse medium of dyes, so the paste is dispersed and aggregated, resulting in uneven printing.

At the same time, the properties of the paste should be considered. It should not react with acids or oxidants.

At present, the commonly used paste is starch and its products, gum, sodium alginate, cellulose derivatives and so on.

During the test, we made a comparative test on starch, Arabia gum, SX glue and thickener 44.

Amylose and amylopectin are two components in starch granules. They are chain like molecules, and the latter are branched chain molecules. Their basic chains are a glucose in glucose.

However, amylose is not easy to hydrolyze and can be suspended in water, heated and swellable, and become a very viscous suspension.

Amylose is easy to hydrolyze.

When heated and expanded into colloid, viscosity and permeability are not as good as amylopectin.

The contents of amylopectin in different starches varied greatly. The amylopectin content in wheat starch accounted for 15%, the amylopectin content in potato accounted for 1%-2%, and the bulk of glutinous rice was amylopectin.

Because of the implicit coordination group at the end of the starch molecule, it has reducibility. When the polymerization degree is high, the reducibility is not obvious.

When the wool is added to the oxidant after printing, if the starch paste is used, the oxidant will be used, such as the use of starch paste, after the oxidant will be used, such as the use of starch paste, will redox reaction, will consume a lot of oxidants, affecting the combination of dyes and fibers, or even pale.

Therefore, it is not advisable to use starch paste when printing with oxidized dyes.

Thickener 44 has been used as an oxidant dye paste. The paste does not react with oxidant, and the printing effect is good. However, after printing, the paste is difficult to wash.

This paste can be applied only for washing and labor.

The SX glue is tested and the printing effect is good. It does not react with oxidants and dyes. After printing, the paste is easy to wash away, and is suitable for printing with oxidized dyes.

Arabia gum (peach glue) for BRUSHING DYES

The color is uniform, printing effect is good, acid is not sticky, because the price is high, in fact, it does not use much.

4. Printing steps

4.1 material selection

According to the sample and user requirements, choose raw materials that conform to the process and user requirements for imitation.

For example, wolf skin imitation mink, marmot skin imitation mink, from the appearance of the wool to imagine, Rex rabbit skin, sheep shearing leather can imitate leopard flower.

The raw material is selected for printing, and the raw materials for rough selection should be selected. The fur should be removed for hair removal, hair loss, hair loss, withered hair, tortoise skin, broken boards and rotten plates.

4.2 raw skin preparation

4.2.1 pretreatment

The fur used for printing is often different from the color of the wool. The color is related to the color of the fur to be copied. Therefore, the wool should be treated before printing, such as bleaching or fading.

Formaldehyde is used to treat fur (retanning) before bleaching, so that the skin plate can resist the action of hydrogen peroxide.

4.2.2

For the white fur or decoloring fur, it needs to be dyed or disseminated into the color similar to the base color of the imitation fur.

4.3 printing is the key process of imitation. The quality of printing determines the imitation effect.

Imitation leopard, the center color is deeper than the background, the outer ring is black, and needs to be covered with plate.

Chemical materials include oxidation dyes, SX glue, penetrant, wool retaining agent MF-3, ammonia and hydrogen peroxide.

Before printing, use a brush to coat the wool. First print the center color, then print the outer ring black.

4.4 Desizing

The dark hair is printed. The problem of washing and removing pulp in water is not big. But when the base of the wool is white, it should pay special attention to prevent the pollution.

4.5 turn sawdust (wood chaff)

Roll the fur with drum, sawdust and brightener to make the hair loose and bright and float away.

4.6 note for printing

(1) when printing paste is ready, add proper preservatives, otherwise it will sour and deteriorate if placed too long.

(2) the preparation of paste should not be too thin, and there is room for adding moderate dye water. That is to say, if the paste is very thin, it will be thinner after adding dye water, and it will not be able to print.

(3) when all the ingredients such as paste and dye are added, defoamer can be added if bubbles are generated.

(4) if two plates need to be colored, two printing plates should be positioned to prevent misplacement of patterns.

After the first printing, it should be dried and then colored to prevent contamination.

(5) when printing, it is better to operate the roll by special person to prevent mistake or uneven force, so as not to appear.

The depth is not consistent.