Tag: screen printing PET film

The structure of traditional screen printing PET film is generally divided into substrate layer, release layer, printing layer and glue layer. The production process is as follows:

• Select a suitable substrate film. The main substrates of screen printing
• PETfilm are OPP, PET, PVC, CP, and PET is widely used. Because of its good stability, uniform tension, and extremely small thickness deviation of the film, PET is widely used.
• Coating the release agent, the release agent plays the role of separating the printing layer and the substrate of the screen printing PET Due to the fast volatilization speed of the release agent, attention should be paid to controlling the viscosity of the release agent, that is, the solid content. At the same time, attention should be paid to controlling the transparency of the release agent and the uniformity of coating to avoid affecting the printing effect and peeling effect.
• For printing ink, the drying temperature of the ink should be selected according to the solvent used. If the solvent is a quick-drying type, the drying temperature should be lowered. Pay attention to the printing color sequence of the thermal transfer film: first print the ink with low color transparency, and then print the ink with high color transparency, and apply one or more layers of white ink according to the pigment, so that the pattern level and tone after transfer are not affected by the background color of the workpiece Impact.
• Coat the glue layer. After the printing layer is dried, apply adhesive glue (also called back glue) to ensure that the printing layer adheres to the surface of the substrate. According to different materials, choose the appropriate temperature to dry the film again.

Kenteer has 27 years of experience in the coating film production of heat transfer materials. Its main products include: heat transfer vinyl, customized heat transfer sticker, screen printing PET film, heat transfer equipment, heat transfer ink, etc. And we are always on the go for better high quality for Kenteer printing factories clients. If you have related needs, please contact us.

You need to know why there is a cold peeling screen printing PET film in the market. Cold peeling screen printing PET film has the following advantages:

First, cold peeling screen printing PET film can peel together after the heat press, which can reduce labor costs, while hot peeling screen printing PET film must be peeled while the heat press, which must form an assembly line operation chain, resulting in an increased in personnel positions.

Second, there are some special fabrics, such as waterproof cloth, coated cloth and other fabrics, which are very thin and coated with colloidal materials. Only cold peeling screen printing PET film printed products can be used so that the fabric has sufficient properties after heat press. The fabric has enough time to restore its properties to ensure its adhesion and flatness after heat press; if it is a hot peeling screen printing PET film printed product, it is easy to wrinkle and warp, which will cause the material to be scrapped.

Tight release of cold peeling screen printing PET film when peeling, the reasons are as follows:

• The area of the printed pattern is too large, and the viscosity of the glue and the penetrating power of the glue solvent are very strong, which leads to the formation of infiltration between the printing glue and the release layer. As a result, the cut edge is torn off tightly, and there are also phenomena such as discoloration, wrinkling, and a pungent smell.

Solution: Pay attention to adjusting the ratio of solvents (main solvent, secondary solvent, auxiliary solvent), and try to reduce the proportion of strong solvents. At the same time, adjust the             viscosity of the glue, increase the solid content, and reduce the osmotic strength.

• The viscosity of the ink is too low to dry. In the actual production process, in order to improve efficiency and improve fluidity, printers often like to lower the viscosity of the ink. Although the adaptability of printing has been solved and the efficiency has been improved, side effects have also followed. This will cause the solvent in the ink to penetrate into the release layer, and at the same time increase the difficulty of volatilization, causing us to seal all the solvent in the inner layer, forming a release layer and ink layer that are miscible. After hot stamping, we tear off both the bottom layer and the bottom layer together in cold tearing. The phenomenon shows that the peeling is very tight, the surface is very rough, the smell is pungent, and even the color remains.

Solution: Increase the viscosity of the ink and strengthen the guarantee of baking; factories with good conditions can use one printing and one baking to ensure layer-by-layer drying.

• The release of screen printing PET film itself is peeled off tightly.

Test method: Take a blank screen printing PET film, use a film or 3M tape, and after bonding, do a tensile test and feel it through the hand. Conditional factories can use a general-purpose screw tensile tester for testing before printing to avoid unnecessary losses to you.

All our products have undergone pre-production raw materials and processes; in-production details and indicators; post-production standard tests to ensure that each batch of products meets the factory standards, and users can use them with confidence.