水转印技术工艺介绍（Introduction of water transfer printing
technology）
Water transfer printing technology, most are based on a plane or planar substrate such as decorative printing, film gravure, offset printing paper; screen printing substrate more, can print some irregular surfaces, such as plastic bottles; adaptability than screen printed printing and progress, but the scope is too narrow. The common point of these printing methods is to utilize the flexibility of the substrate to transfer the images on the plate to the substrate by pressure. Transfer technology belongs to indirect printing, graphic printing not by so directly on the substrate surface, printing, very much can transfer the substrate shape and type of materials, such as pressure water transfer printing technology is the use of water to add coating on the surface of an object, the transfer printing technology.
Water transfer printing technology classification
According to the characteristics of water transfer, can be divided into drape water transfer and water transfer.
1. water drape transfer printing
The so-called drape water transfer, refers to the decoration of all the surface of the object, the workpiece should be able to cover the whole surface (stereo) for pattern printing, this is its advantages; but the disadvantages are also obvious, that is by flexibility of the carrier in full contact with the substrate inevitably occur when tensile deformation, so. In
fact, the transfer to the surface of the object image to achieve fidelity.
For the transfer of water transfer paper printing ink color is mostly by decorative color and simple repetitive pattern, no fine print sensitive film; water transfer film is composed mostly of flexible water soluble film manufacturing, transfer film for three-dimensional transfer is difficult for small text and the level of image transfer replication.
2. water transfer
Water transfer is the transfer paper on graphic transfer to process the substrate surface, it is like the heat transfer process, just rely on hydraulic pressure transfer, water transfer printing technology is a recently popular graphic information, it can transfer a small area on the substrate surface, similar to shift printing printing but the investment effect, low cost, operation process is relatively simple, very popular with users. Water transfer process without activator, avoid organic solvent pollution, has obvious advantages in the production of handicrafts and decorations.
Water transfer material
Water transfer printing material refers to the surface of the substrate processing can transfer the overall picture printing film, the base material can be plastic film, or water transfer paper. This printing film as the image carrier, it appears to be a great progress in printing technology, because there are a lot of products is difficult to direct printing, and with this
carrier, people can use mature printing technology to print the first graphic will be printed on the carrier, then the image transferred to the substrate. If you have a high degree of heavy, strange shape, or small items, you can use the transfer process. For the single water transfer process, its adaptability is very wide, almost can not transfer products, used to transfer material of water transfer with water bestrow transfer film and water transfer paper.
(1) water drape transfer film
Similar to the production process of heat transfer membranes, the water transfer printing film is made by using an intaglio printing machine and a traditional printing process, and is printed on the surface of the water-soluble polyvinyl alcohol film. The substrate of water transfer printing film has a high rate of extensibility and is easily attached to the surface of the object easily. This is also the main reason why it is suitable for transferring on the surface of the whole object. But it is also obvious that the flexibility is great, that is, in the process of printing and transfer, the surface of the film is easy to deform. The second is the transfer process. If the processing is not good, the film may break. In order to avoid this shortcoming, we often put the water transfer coating printing film on the graphic design, with no specific shape, deformation does not affect the ornamental repeated patterns. Water transfer printing film can obtain high elongation in gravure printing, the cost can be reduced, with precise automatic tension control system of gravure printing machine, one can print 4 to 8 colors, overprint accuracy. Gravure printing water transfer film using water transfer printing ink,
and compared with traditional ink, water transfer printing ink water resistance is good, dry way is volatile drying.
(2) water transfer paper
The substrate water transfer paper is a special paper, soluble in water, from the aspect of structure, and drape water transfer film is not much difference, but the production process is very different. Water transfer paper is on the surface of the substrate by screen printing or offset printing to manufacture a transfer pattern, as shown in figure 1.
Screen printing water transfer printing ink is a kind of special water resistant ink, and offset water transfer printing ink can be replaced by general offset printing ink, use special water transfer offset printing ink better. It is difficult to make water transfer paper by screen printing, but the ink layer is very thick;
Offset printing, printing water transfer paper graphics and text to achieve higher resolution.
Water transfer paper printing ink jet printer, is now the most popular method of making and using the printer and computer more easily according to their own preferences personalized photo, so popular. The production process of water bestrow transfer film and water transfer paper as shown in figure 2.
Water transfer printing process
1. water drape process