First, what is digital thermal transfer?
Digital thermal transfer technology is a new technology that combines traditional thermal transfer technology with digital printing technology to print color images and patterns without plate-making.
At the earliest, this technology was not used in the clothing (textile) industry, but in billboards, signs, or ceramics. Later generations have expanded it and applied it to the clothing industry.
Here, the digital thermal transfer we are going to talk about is digital thermal transfer using inkjet printing technology as a technical form, because it can guarantee a certain width and fixed length, which is suitable for industrial production.
Second, digital thermal transfer is a new technology to adapt to market changes
Strictly speaking, the market positioning of digital thermal transfer technology and products is a personalized product market, which is a new technology to meet the needs of personalized market development and consumers' demand for personalized products. It is also a traditional thermal transfer technology. And an effective complement to the traditional thermal transfer product market. Traditional thermal transfer products are difficult to produce small batches of personalized products due to technical limitations and plate-making costs.
Therefore, in the past traditional thermal transfer market, the technology dedicated to personalized products has a period of market blank. The advent of digital thermal transfer has made it possible to produce personalized thermal transfer products. Moreover, the printing quality of digital thermal transfer product image patterns far exceeds the traditional thermal transfer technology. This is why digital thermal transfer technology can be promoted and popularized in just a few years.
Third, the understanding of thermal transfer and the characteristics of traditional thermal transfer
1 thermal transfer concept:
The commonly used thermal transfer is a technical form in which a pattern and an image on a thermal transfer paper are transferred to a 180C0--230C0 transfer on different material media using a thermal transfer device.
The earliest thermal transfer technology is applied in the textile printing and dyeing industry and the shoe material industry. Later, with the development of the times and the advancement of technology, the application fields have been increasing. Especially the emergence of digital technology and the emergence of personalized consumption concepts have made the application of thermal transfer technology more popular and extensive. The application products are endless and cover almost all material fields. . For example, metal, wood, stone, ceramic, glass, PVC, leather, chemical fiber fabrics can be transferred to beautiful patterns and images using thermal transfer technology to produce and produce exquisite products.
2 thermal transfer printing method
There are two kinds, one kind of sublimation transfer method:
After the color paste produced by the heat-raising disperse dye is printed into a printing paper by a screen or a gravure, the pattern on the printing paper is transferred onto a desired medium.
The second is the thermosetting transfer method:
The thermosetting ink, also known as hot melt adhesive, is printed on the printed paper by screen printing, and then transferred to the cultural shirt and clothing.
The difference between the two methods is that the sublimation transfer method is mainly applied to chemical fiber cloth and hard material coated with thermal transfer coating, and the thermosetting transfer method is mainly applied to pure cotton products. Second, the texture produced by the two methods is also different. After the transfer of the sublimation pattern, the original texture of the material is not changed, and the hand feeling and the look are good. After the thermosetting pattern is transferred, a layer of gel is formed on the surface of the attached object, which is inferior in hand and airtight. The two printing methods have their own advantages and disadvantages in production and production, each with its own characteristics.
3 types of thermal transfer
Thermal separation: Thermal separation is again seen as a "hot strip" transfer. She is one of the most popular transfer, because when used on a shirt, it has the same soft texture as the direct use of screen printing. The reason why it is called "hot peeling" is because after applying the transfer product for 10 seconds by the hot press, the paper is quickly peeled off and the ink is divided into two. Some of the ink will be transferred to the shirt while the other part will remain on the paper. This gives the transfer product a soft texture.
Cold peeling: Cold peeling transfer is still very popular. It is mainly used for the printing of sportswear and for metal foil printing on shirts. In fact, if you can operate correctly, you can choose either thermal separation or cold stripping for transfer printing. There is no difference between the effect of heat separation and cold stripping and the operation. The real difference is the application of the paper and press. When you use cold peeling, cool the transfer paper for about 30 seconds before you strip the paper. This operation causes the ink to remain completely on the garment, and the transferred pattern has a strong elastic texture similar to rubber. Cold-release prints are generally not suitable if larger prints are printed on t-shirts because they are very hot on the body and can affect the breathability of the shirt. They also cannot be washed because cracks can occur in the rubber layer on the top of the ink. Then, the cold peeling came back as a "retro" type of print and was being used again.
Inkjet transfer: Inkjet is commonly used when printing shirts directly and making transfer products. Conversion inkjet is a special type of ink that is automatically ejected under high temperature pressure.
4 Characteristics and technical methods of traditional thermal transfer
There are three technical methods of traditional thermal transfer: silk screen thermal transfer, gravure (copper plate, electro-engraving plate) thermal transfer, offset thermal transfer. The traditional sublimation thermal transfer feature is printed.
Fourth, thermal transfer process
1, thermal transfer printing is divided into transfer film printing and transfer processing:
(1) The printing of transfer film adopts dot printing (resolution up to 300dpi) to pre-print the pattern on the surface of the film. The printed pattern is rich in layers, colorful, ever-changing, small in color difference, good in reproducibility, and can meet the requirements of design designers. Effective and suitable for mass production;
(2) Transfer processing The fine transfer pattern on the transfer film is transferred to the surface of the product by one-time processing (heating and pressing) of the heat transfer machine. After the molding, the ink layer is integrated with the surface of the product, which is beautiful and beautiful, greatly improving the product. Grade.
Today, thermal transfer technology has been widely used in textiles, plastics, cosmetics, toys, electrical appliances, building materials, gifts, food packaging, stationery and other industries.
2. What are the principles and characteristics of the thermal transfer process:
The principle of thermal transfer: pre-print the color pattern on the heat-resistant substrate film (by release treatment), and then transfer it to the surface of the product by hot stamping with special transfer equipment. Reliable technical stability, good material formulation and equipment close cooperation.
Thermal transfer process features: simple operation, low production process, high efficiency, no pollution, small footprint, and low investment. After printing, the adhesion is good, the gloss is high, the picture is clear, the color is accurate, the color is bright, safe and non-toxic, and after hot stamping, it can be processed by spray blasting, secondary injection molding, bending and punching.
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