Do you know sublimation transfer process?
Since the new century, the development of textile transfer technology has been extremely rapid, and the market share in the fabric decoration market has been rising. One of the main reasons is the limitation of traditional high-pollution printing and dyeing technology at the national level.
The sublimation transfer machine mainly has two structural forms, one is flat flat type, and the other is round flat type. The flat-press flat transfer machine is simple in structure and low in price. It has been brilliant for a while, but with the transformation and upgrading of traditional high-pollution printing and dyeing enterprises and China's entry into the ranks of middle-income countries, the roller type is faster and saves labor costs. The flattening presses began to show significant advantages.
Schematic diagram of transfer printing:
First, the principle of roller printing
The picture above is the structural schematic of the roller printing machine. The cloth and the sublimation transfer paper that has been printed are synchronized into the gap between the heating roller and the felt. The felt is pressed against the surface of the roll by a pressure roller and moved relative to the heated roll. The pattern on the thermal transfer paper is transferred to the surface of the cloth due to heat and pressure. The process of physically converting solids directly into gases is called "sublimation," and the process of converting gas to solids is called "condensation." However, the author has asked the insiders for proof, and there is no test to prove that sublimation occurred during the transfer process. Whether in the extreme time, the pigment on the thermal transfer paper has undergone sublimation and desublimation, and it needs expert confirmation!
In any case, the process technology is called sublimation transfer technology.
In the 1990s, textile industry developed countries such as Spain and Italy took the lead in developing roller printing machines, but they were not popularized. In addition to price factors, their low production efficiency is also a constraint factor. The most common on the market are various pneumatic flat heat transfer machines.
Advantages of the roller printing machine:
Readers may be confused. The previous article just said that the roller printing machine is inefficient, and now it has become faster. In fact, the speed is only relatively speaking. Compared with the large-scale industrial dyeing and finishing technology, the speed of the roller printing machine is simply low, but the speed of the roller printing machine is nearly 5 times faster than that of the ordinary flat transfer machine.
The process technology of the roller printing machine basically has no environmental pollution problem, the paper can be recycled, and the felt does not volatilize harmful components in the human body under high temperature conditions. The ink printed on the paper by the printer uses water or alcohol as a solvent and can be discharged directly into the groundwater system. Some organic dyes may cause skin irritation, but they are special and fully controllable.
Personalization is a realistic challenge to large-scale industrial production. The trend of the apparel industry's orders to small batches, individualization, and diversification is obvious. In the printing industry, the most personalized technology is printing technology. Because it is integrated with the computer, it can realize various small batch customization. The front-end technology of the roller printing machine is printing technology, which extends the personalization of printing technology to specific consumers.
Wide range of adaptation
The roller printing machine is not only suitable for the cut pieces of the finished clothes, but also suitable for the roll type fabric. Some users have tried to use the roller printing machine to achieve satisfactory results in the transfer of carpet and metal sheets. Through the necessary machine upgrades, the roller printing machine can also transfer glass, wood and decorative materials.