Squeegee pressure gauge is a display instrument that measures the friction between the squeegee and the screen according to the squeegee pressure. The unit of measurement is kg / cm. The test method is to place the test strip between the scraper and the polyester mesh, and use a pressure gauge to perform the pull test operation. During the measurement, the friction value is obtained according to the number indicated on the dial.
The coating trough is a tool used to apply photosensitizer on the screen. The coating trough is mostly made of stainless steel. This coating trough has the characteristics of light weight, light use, strong corrosion resistance, not easy to rust, and convenient production.
There are two uses for the coating trough: one is to apply photosensitive glue, and the other is to seal the mesh. When coating the photosensitive adhesive, first pour the photosensitive emulsion into the coating trough, generally the amount does not exceed 1/2 of the capacity of the coating trough. When using, tilt the polyester mesh frame that stretches the mesh about 70 degrees, and lean against the fixed bracket On the top, the blade edge of the coating trough into which the photosensitive emulsion is placed is horizontally leaned against the lower end of the screen frame, and then the coating trough is tilted slightly upward to make the photosensitive agent contact the Internet. Then make a smooth movement from bottom to top. In order to firmly combine the photosensitive film with the screen. Coating is carried out on both sides of the screen frame. The outer frame is coated more times than the inner surface. The specific operation method is: scrape once, dry once. In order to ensure the uniform thickness of the coating film, the position of the screen frame is changed up and down after each scraping, and the operation method is repeated until the required film thickness is reached.
It can be known from the foregoing that the coating trough is an important tool for coating photosensitive adhesive. The quality of the coating trough directly affects the quality of the polyester mesh printing plate. When using it, you should pay attention to the following aspects: 1) First, the edge of the blade that the coating trough is in contact with the wire mesh must ensure a high flatness, and there must be no traces of injury. If the flatness is low or there are scratches, the film layer after coating will have streaks or uneven film thickness, which will cause burrs and uneven ink layer thickness after printing. 2) Secondly, the edge of the cutting edge should be smooth. If this point is ignored, it will cause the result of scratching the screen when coating. 3) Because the stretched screen has a certain elasticity, the uneven thickness of the film is easy to occur during the coating process, that is, the film thickness in the middle part and the film on the four sides are thin. In order to avoid this kind of problem, usually when making the scraper, the side that touches the screen is slightly arc-shaped, so that the uneven film thickness caused by the elasticity of the screen can be avoided. 4) When making the scraper, try to choose stainless steel materials that are not embroidered, corrosion-resistant and lightweight.
PREVIOUS： Polyester mesh tool
