Wood grain transfer formulations often use two polyesters with high and low hydroxyl values. If the difference between the two hydroxyl values is too small, the gelation time is not much different, and the separation between the coating film and the transfer paper is not easy. Through a large number of experiments, we have determined the hydroxyl value of the hydroxy polyester resin as 75 mgKOH/g. >75 mgKOH/g is a high hydroxyl value, <75 mgKOH/g is a low hydroxyl value, and the polyester resins of the two ranges of hydroxyl values are used to obtain a coating film which is easily separated from the transfer paper.
Wood grain transfer and water transfer printing technology
There are two types of wood grain transfer technology, one is watermark transfer technology, and the other is water drape transfer technology. The former mainly performs transfer of text and photo patterns, while the latter tends to carry out on the entire product surface. Complete transfer. In the "Introduction to Printing Industry" in 1973, it was pointed out: "Chinese printing is not invented by someone alone, nor was it suddenly invented in a certain era; it is the crystallization of the wisdom of thousands of sages. The accumulation of the millennium experience gradually integrates the collective creation of evolutionary development.
"Cubic Transfer uses a water-based film that is easily dissolved in water to carry the image. Because of the excellent tension of the water-coated film, in view of the Tang Dynasty, Tang, Tang, and Five Dynasties, Several remarks such as the Song Dynasty were overthrown by existing literature and cultural relics. Beijing stainless steel has no further discussion. Therefore, this article only briefly reviews and describes the Han Dynasty, the Six Dynasties, the Sui Dynasty and Jiang Yuan.
Printing is a process technology, which is a process and process for transferring a wood grain on a printing plate onto a substrate by a transfer material. It is easy to wrap around the surface of the product to form a graphic layer, and the surface of the product has a completely different appearance as a paint. Draping transfer technology can cover color patterns on workpieces of any shape, and the switcher solves the problem of stereoscopic product printing for manufacturers.
The surface coating can also add different lines on the surface of the product, such as skin, wood, jade and marble, and also avoid the imaginary position in the general board printing. And the education consultation in the printing process, because the surface of the product does not need to be in contact with the printed film, can avoid damage to the surface and integrity of the product.
Since wood grain transfer has the properties of corrosion resistance, impact resistance, aging resistance, abrasion resistance, fire resistance, and non-discoloration for 15 years in outdoor use, almost all products are produced in this way. For example, when you open the phone case, you can see the dense bar code label inside the cabinet. Many label requirements can withstand the test of time, long-term deformation, no fading, can not be worn by contact with solvents, can not be discolored due to high temperature, so it is necessary to use a special material printing medium and wood grain transfer material to ensure these Characteristics, general inkjet, laser printing technology can not be achieved.
Wood grain transfer use
Vacuum wood grain coating technology: After the electrostatic spraying of metal products is completed, the wood grain is transferred to the surface of the workpiece by thermal transfer. It is not easy to fade, the wood grain is realistic, and the product is improved. Widely used in: aluminum alloy doors and windows, security doors, fire doors, steel and wood furniture, file cabinets, computer casings, household appliances, metal parts and other high temperature resistant metal materials.