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 (1)
What isTransfer printing fabric (cloth)
Printing pigments or dyes on paper, rubber or other carriers, and then pad printing onto the goods to be printed is called transfer printing, but in a narrow sense, transfer printing refers to Pad printing technology using needle textiles as carrier. Transfer printing is mainly used on polyester fiber products. With the improvement of transfer printing technology, it is also widely used on nylon, acrylic, cotton, linen, and wool fabrics.
Transfer printing fabric (cloth) divided into wet method, dry method, steam method, vacuum method, thermal method, etc. form. The transfer printing method can accurately reproduce patterns, facilitate mechanized production, and has a simple process. In particular, the post-printing process is simpler than traditional printing and dyeing and the printing feel is the same as printing and dyeing. Therefore, it has the potential to gradually replace the old printing method. However, most printing and dyeing factories in my country still use traditional printing and dyeing methods, and only a few production units use transfer printing for production.
1. Transfer printing fabric (fabric) Features
(1)Transfer printing fabric (cloth)The pattern has the characteristics of realistic pattern, detailed pattern, clear layering and strong three-dimensional effect. Transfer printing can print natural scenery and artistic patterns.
(2) Transfer printing fabric (cloth) The equipment has the characteristics of simple structure, small footprint, low investment and high economic efficiency. Since the equipment is tension-free processing, it is suitable for printing of various thicknesses. In addition, after transfer printing, it can be packaged and shipped without post-processing.
(3) Transfer printing fabric (cloth) does not have environmental pollution problems. Due to dry processing, there is no need for washing, steaming, drying and other processes, so there is no waste gas and waste water discharge.
(4) Transfer printing fabric (cloth) has the advantages of high production efficiency, labor saving and easy operation.
In addition to polyester, currently widely used hot-melt resins include polyamide, vinyl acetate copolymer and polyurethane. The main component of polyester hot melt adhesive is polyester resin, which is a polybasic acid. Obtained by lipidation with polyols. Polyamide hot melt adhesive has strong adhesion, toughness, low temperature resistance and excellent affinity with nylon fabrics, making it suitable for preparing nylon transfer printing paper. Ethylene-vinyl acetate copolymer has a low melting point and strong adhesion. After adding printing ink, it is suitable for producing transfer printing paper. Polyurethane hot melt adhesive is mainly used for gluing leather and polyhydrethylene plastic. For transfer printing, since the fabrics to be printed are different, it is best to use suitable hot melt adhesive ink.
Introduction to transfer printing fabric (fabric) knowledge
2. Principle of transfer printing fabric (fabric)
Transfer printing fabric (fabric) is mostly used for polyester fabrics. It is passed through high temperature (200℃ or so), the dye is heated to sublime into a gas phase and condenses on the polyester surface, and then flows into the fiber macromolecules. A printing method that penetrates the setting area and is fixed inside the fiber after cooling.
3. Transfer printing fabric (cloth) Requirements for dyes
The sublimation temperature of disperse dyes used in transfer printing should be lower than the melting point of fiber macromolecules and not damage the strength of the fabric. The suitable processing temperature for polyester is 180–210℃. Within this temperature range, the molecular weights of dye sublimation species are all between 230–270. There are generally three types of disperse dyes with molecular weights in this range.
Fast dyeing disperse dyes: the temperature is 180℃ can sublimate the hair color. If the temperature increases further, the color will change and the edges will bleed.
Good disperse dyes: temperature at 180–210℃ can sublimate hair color. Hair color curve is flat. The temperature during dyeing has little effect, so it is a suitable disperse dye for transfer printing.
Late dyeing disperse dyes: at 180– At 210℃ it is impossible for the dye to sublimate and develop color well. If the temperature is raised, good hair color can be obtained. This type of dye has a strong dependence on temperature when dyeing.
Based on the above situation, the dyes suitable for transfer printing fabric (fabric) should meet the following conditions:
(1 )The dye of transfer printing fabric (cloth) must be in 210℃ or below is fully sublimated and fixed on the fiber, and can obtain good washing fastness and ironing Iron fastness.
(2) The dye in transfer printed fabric (cloth) can fully sublimate and transform into gas phase dye macromolecules after being heated, and condense on the surface of the fabric , and can diffuse into the fiber.
(3) Transfer printing fabric (cloth) The dye used has a smaller affinity to the transfer paper and a larger affinity to the fabric.
(4) The dye of transfer printing fabric (fabric) should have bright and bright color.
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