While digital on-demand printing has gradually begun to reach the market, thermal transfer technology with the same personalized characteristics as on-demand printing has also been loved by people because it can print color graphics and text on paper products, On printing materials such as textiles, ceramics, plastics, metal, and label paper, the method is simple, the cost is low, and the personalization is strong, thus leading a new trend of transfer printing.

1. Features of transfer printing

Transfer printing is to first print graphics on the carrier to make a transfer material, and then use the printing glue head, thermal transfer printer, transfer printing paper or transfer printing film to transfer the graphics on the transfer material to the substrate. Transfer printing can be printed on the surface of substrates that are not easy to print on the printing machine in various forms, shaped objects or soft materials. Before printing, the image and text are printed on the intermediate transfer carrier, and then this carrier transfers them to the substrate by special technical means, such as heating, wetting, and pressing, to form a printed product. According to the classification of transfer printing technology, it can be divided into cold transfer printing, thermal transfer printing and pressure transfer printing.

1. Cold transfer printing

Can be divided into dry transfer printing and wet transfer printing.

Dry transfer printing: The carrier generally uses a plastic film, first pre-coating the release layer on the film, then printing graphics on the coating, and then using a sticker as an ink to print a layer of adhesive. It is pasted on the substrate during transfer printing and the carrier film can be removed.

Wet transfer printing: The carrier is generally made of paper or film, pre-coated with a water-soluble release layer, and after printing graphics, the back adhesive is printed. The back adhesive is water-soluble. When moistened with water, transfer to the substrate and remove the carrier.

2. Thermal transfer printing

Mainly include sublimation thermal transfer printing, deinking thermal transfer printing, flocking thermal transfer printing, thermal transfer printing, etc.

Sublimation thermal transfer printing: paper is used as the carrier, and sublimation ink is used for printing. During the transfer printing, the heated image can be transferred to the substrate. The inks used are formulated with sublimation dyes and are mostly used for the transfer printing of synthetic fiber fabrics.

Deinking and thermal transfer printing: paper or film is used as a carrier, and plastic ink is used for printing. Because the ink contains hot-melt linking material, generally no adhesive is printed. During the transfer printing, it is heated and pressurized. After the ink layer is heated, the bonding material melts and adheres to the substrate. When the carrier is removed, the graphic ink layer can be separated from the carrier and transferred to the substrate.

Flocking thermal transfer printing: use paper as a carrier, pre-coat a layer of hot melt adhesive on the paper, then flocking on the adhesive surface, and then use hot melt ink on the velvet surface (actually a hot melt adhesive formulated into a solution ) Printing graphics.

Thermal transfer printing: Simply put, the process of transferring ink from carbon ribbon media to paper or film with heat and pressure is mainly used for label printing. When the label passes through the printer's print head and pinch, heat and pressure transfer the ink to the label.

3. Pressure transfer printing

Such as pressure-sensitive transfer printing, the printing carrier generally uses a film, pre-coating the release layer and then printing graphics, and the back adhesive is printed with a special pressure-sensitive adhesive as the printing ink. During transfer printing, press the film on the glossy side of the film to transfer the image to the substrate.

2. Common types of label transfer printing

Label transfer printing is the use of physical and chemical methods-print patterns and color transfer printing on the substrate, common label transfer printing methods are as follows.

1. Wipe transfer printing

Mainly suitable for hard and smooth materials such as paper, wood, plastic, etc., used in art design, photo albums, toy stickers, scratch music, transfer printing paper, etc. When using it, release the release paper on the surface of the finished label, align the pattern with the position to be transferred and print, and evenly rub the back of the pressure-sensitive film with nails or wood chips, and tear the transparent film to complete the transfer of pictures and text.

2. Reverse pressure-sensitive transfer printing

There are three types of reverse pressure-sensitive transfer printing labels: solvent-resistant, scratch-resistant, and baking-resistant. Solvent-resistant type can withstand solvent scrubbing; scratch-resistant type can have good adhesion and scratch-resistant effect without any treatment after transfer printing, but to avoid scratching by hard objects; high-temperature baking type can be transferred during printing After glazing baking treatment, it is also possible to directly perform baking treatment without spraying varnish. Pressure-sensitive transfer printed labels are suitable for surface decoration of hard materials such as metal, plastic, synthetic materials, such as air conditioners, refrigerators, washing machines, water heater housings, fishing rods, clubs, bicycles, etc. When in use, only need to tear the protective film, align the transfer position and paste, evenly squeeze and tear the bottom paper to complete the pattern transfer.

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