Transfer printing refers to a printing method that presents irregular undulations on the surface of some substrates, or formed objects, or soft materials, which is not convenient for printing on the printing press.Classification Of Transfer Printing

       In order to print images and characters on the surface of these substrates, the images and characters must be printed on a material called intermediate transfer carrier, Classification Of Transfer Printing

      and then transferred to the substrates by this carrier through some methods, such as heating, wetting, pressure, etc., and finally form printed matter.Classification Of Transfer Printing

       Transfer printing is classified by transfer mode, including direct pad printing and indirect pad printing. Direct pad printing is to use the pad printing head to suck the ink on the concave plate on the special pad printing machine,Classification Of Transfer Printing

       and then transfer it to the substrate. It is mostly used for irregular concave convex containers, small decorations, toys and tableware on the surface.Classification Of Transfer Printing

        Indirect pad printing uses special transfer paper or transfer film to print patterns first, and then transfer them to the substrate. It is mostly used for ceramic decal printing, textile printing, commodity label printing and so on. Classification Of Transfer Printing

       According to the classification of transfer technology, there are wet transfer, heat transfer and pressure transfer.Classification Of Transfer Printing

      Transfer printing has a wide range of applications. First of all, its substrates not only have different shapes, but also have a variety of materials. Classification Of Transfer Printing

       Some irregularly shaped formed containers, children’s toys, furniture, trademarks and other daily necessities such as ceramics, glass, plastics, textiles and leather are widely used for printing. Classification Of Transfer Printing

       Transfer printing can almost make up for the printing of various materials that can not be printed by many curved surface printing. Except that direct pad printing is printed on a special pad printing machine,Classification Of Transfer Printing

        other transfer printing is off-line printing, that is, the intermediate transfer implant and the substrate are independent, and they do not affect their processing.Classification Of Transfer Printing

       Because transfer printing can be applied to planar or irregular concave convex surfaces, such as multi segment surfaces, multi curved surfaces and multi angular planes, and can realize multi-color exquisite printing, it also plays an important role in the field of packaging printing.Classification Of Transfer Printing

      Direct pad printing is based on the principle of intaglio printing, that is, after all the ink is coated on the concave plate, the ink in the blank part of the convex surface is engraved with a scraper, Classification Of Transfer Printing

      only the ink in the pattern part of the concave surface is left, and then the ink is pasted with a pad printing head made of silicone rubber under pressure, and then transferred to the substrate. Classification Of Transfer Printing

       Pad printing machine is the main equipment of pad printing, in which the pad printing head plays the role of transfer. Therefore, pad printing plate, pad printing head and pad printing ink constitute the three elements of pad printing process, and the pad printing process is automatically completed by the pad printing machine.  Classification Of Transfer Printing

      On the premise of determining the pad printing plate and pad printing head, the quality and performance of pad printing ink has become the decisive factor of pad printing effect.Classification Of Transfer Printing

For the performance of pad printing ink, the following printability is required:Classification Of Transfer Printing

(1) Suitable drying speed. Generally speaking, pad printing ink is a fast drying ink based on volatile drying, but relatively speaking, there are two kinds of pad printing ink:Classification Of Transfer Printing

      slow drying and fast drying, that is, generally, those who dry within 2-5s are fast drying pad printing ink, and those who dry above 5S are slow drying pad printing ink.Classification Of Transfer Printing

(2) Good deinking ability. This deinking ability refers to the deinking ability of the pad printing ink to the pad printing head, that is, the ability of the ink to transfer from the pad printing head to the substrate. Of course, it is also related to the deinking ability of the pad printing head.Classification Of Transfer Printing

(3) Good ink adhesion. Due to the wide range of pad printing and many kinds of substrate materials, pad printing ink is required to have good adhesion to different substrate materials. Classification Of Transfer Printing

      In addition, as a pad printing ink, it is also required not to corrode the pad printing head and plate. Therefore, the solvents used in mobile ink are usually butyl acetate, cyclohexanone and turpentine.Classification Of Transfer Printing

        Indirect pad printing is a printing method to transfer the image to other substrate materials after printing through a transition carrier for those substrate materials that are not suitable for printing on the surface of direct printing machine, such as some plane, three-dimensional, curved surface and their products.Classification Of Transfer Printing

        There are many indirect transfer printing methods, including decal printing, heat transfer, temperature transfer, pressure transfer and self-adhesive trademark printing.Classification Of Transfer Printing

       The printing methods on this transition transfer body include lithography, embossing and gravure printing. In recent years, with the continuous improvement of screen printing technology, the increase of the variety of screen printing materials and the improvement of equipment, Classification Of Transfer Printing

       a transfer technology using screen printing method has emerged, which provides more printing methods for indirect transfer printing, which is undoubtedly greatly expanded;Classification Of Transfer Printing

       Application scope of transfer printing. The following focuses on fabric heat transfer printing.Classification Of Transfer Printing

        In addition to printing and dyeing and silk screen printing technology, in order to improve the printing effect and increase the three-dimensional sense of the image, many fabric fiber products use heat transfer printing methods, such as sublimation dispersion dyeing transfer, melting transfer, film removal transfer, etc. Classification Of Transfer Printing

        Heat transfer printing is mostly used in the transfer of trademarks or pictures and texts of fiber products, such as clothing, shoes, hats and bags. The base material of heat transfer printing is paper (or film), which is coated with release agent. Classification Of Transfer Printing

       This paper has a certain adsorption capacity for ink, more importantly, it has a certain deinking capacity, and can withstand a temperature of about 150 ℃.Classification Of Transfer Printing

        First, select the printing methods according to different requirements, such as embossing, lithography, gravure and screen printing, either of which can be used. Classification Of Transfer Printing

        Then make the corresponding printing plate and use heat transfer paper (or film) for monochrome or multicolor printing on the printing machine. Classification Of Transfer Printing

        After printing, apply a layer of heat transfer adhesive for standby. During transfer printing, the transfer paper printed and coated with heat transfer adhesive is closely connected with the textile on the transfer machine.Classification Of Transfer Printing

        Under the temperature of 150-170 ℃ and the pressure of 0.1-0.25kgf/c ㎡ (g.8-24.5kpa), the printed pattern can be separated from the paper surface and transferred to the fabric and firmly attached to the fabric after 5-10S hot pressing.Classification Of Transfer Printing

       For the heat transfer adhesive that must be used in heat transfer printing, according to the author’s understanding, there is no production in China, or the quality can not meet the requirements, it still needs to rely on import.Classification Of Transfer Printing