What is transfer printing fabric (fabric)? Introduction to transfer printing fabric (fabric) knowledge? What is the purpose of transfer printing fabric (cloth)? Transfer printing fabric (fabric) English (2)
IV. Color ink for printing transfer paper
Transfer printing fabric (fabric) For printing on transfer paper, most printing and screen printing processes and equipment are used. Color ink is composed of dyes, carriers, binders, etc. The preparation of color ink is to mix the above three ingredients and pour them into a colloid mill or three-roller grinder to grind them so that the dye is evenly distributed in the color ink.
(1) Vehicle The function of the vehicle is to evenly distribute the dye in the color ink and transfer the dye from the printing equipment to the transfer paper. The vehicle should be cheap, non-toxic and non-flammable. According to this requirement, water is suitable. However, transfer paper is composed of cellulose. When water is used as the vehicle, the fibers will expand, causing deformation of fine patterns. Moreover, because water evaporates slowly, it is difficult to produce at high speed. If organic solvent-based colorants are used, although the paper deformation is small, the color ink can print fine patterns and has suitable volatility, which is conducive to higher-speed production. But it has the disadvantages of higher cost and easy combustion. Be careful when using it. Oil vehicles, such as high boiling point oils, can also be used. However, high boiling point oil will cause the dye to diffuse deep into the transfer paper, thus affecting the amount of dye transfer from the transfer paper to the fabric.
(2) Binder Binder refers to the substance that controls the viscosity of the ink. If the amount of binder is too small, the viscosity of the color ink cannot be guaranteed, resulting in poor printing transfer paper effect. If the amount of binder is too large, the transfer speed of dye from the transfer paper to the fabric will be slowed down, resulting in residues on the transfer paper. Too much dye. Depending on the vehicle used, the binder should be selected separately. When water is used as the vehicle, commonly used synthetic dragon gum or carboxymethyl cellulose is used as the binder: when organic solvents or oils are used as the vehicle, ethyl cellulose can be used as the binder.
5. Transfer printing fabric (cloth) Printing method of floral paper
Printing of floral paper is a process in which colored inks are printed onto transfer paper through printing and screen printing methods. At present, transfer printing paper is mostly printed by printing method. There are four printing methods for decals: gravure printing, letterpress printing, offset printing and screen printing. Printing methods are used to print decals, with gravure printing being the most common. The screen printing method is suitable for printing small batches and multiple varieties of transfer printing paper, and the paper can be made at the printing and dyeing factory. It has the characteristics of low cost, fast speed, thick color and easy operation. However, due to the use of water-soluble ink in the screen printing method, the three-dimensional effect and outline clarity of the pattern on the flower paper are not good, the pattern is thick, and the characteristics of the transfer printing pattern cannot be exerted.
6. Transfer printing fabric (fabric) to transfer paper Requirements
When printing transfer paper for transfer printing, the transfer paper used should have the following characteristics:
(1) It must have sufficient strength;
(2) The affinity for the color ink should be small, However, the transfer paper must have good covering power for the ink;
(3) The transfer paper should not be deformed, brittle or yellow during the printing process.
(4) The transfer paper should have appropriate hygroscopicity. Too little hygroscopicity will cause mismatching of color and ink; too much hygroscopicity will cause deformation of the transfer paper. Therefore, the filler must be strictly controlled when producing transfer paper. It is more suitable to use semi-fillers from the papermaking industry.
According to the above requirements, the transfer paper should meet the following standards:
Hygroscopicity 40–100g/㎡
The tear strength is about100kg/5x20cm
Breathability 500—2000l/min
Weight 60–70g/㎡
Ph value 4.5–5.5
No dirt exists
Transfer paper is best made of softwood pulp. Among them, chemical method It is better to make half of the paper pulp and half of the mechanical pulp. This can ensure that the decal paper will not become brittle or yellow when treated at high temperatures.
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