Professional designer and manufacture of CCD machines for ONE STOP SOLUTION.
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Professional designer and manufacture of CCD machines for ONE STOP SOLUTION.
What is the purpose of the scraper pressure gauge?
The 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:
Put the test strip between the scraper and the wire mesh, and use the pressure gauge to operate by pulling the test method. During measurement, the friction force value is obtained according to the number indicated on the dial.
What is the purpose of the scraper? What is the specific coating method?
The scraper is a tool used to coat the sensitizer on the screen, also known as the sizing machine. The commonly used scraper is mostly made of stainless steel material. This scraper has the characteristics of light weight, easy use, strong corrosion resistance, not easy to rust, and easy to make.
The scraper has two purposes, one is to apply photosensitive adhesive, and the other is to seal the net. When coating the photosensitive adhesive, first pour the photosensitive emulsion into the scraper, and generally the pouring amount does not exceed 1/2 of the capacity of the scraper. When in use, tilt the frame of the stretched net about 70 degrees, lean on the fixed bracket, put the blade edge of the scraper into which the photosensitive emulsion is placed horizontally against the lower end of the screen frame, and then make the scraper slightly upward. Tilt brings the sensitizer into contact with the web. Then make a steady movement from bottom to top. In order to firmly combine the photosensitive film with the screen. Coating is scraping on the inside and outside of the screen frame. The times of coating on the outside of the screen frame are more than those on the inside. The specific operation method is: scrape once and dry once. In order to ensure the uniform thickness of the coating film, after each scraping, the position of the screen frame is changed up and down, and this operation method is repeated until the required film thickness is reached.
What are the main technical specifications and requirements of the scraper?
It can be seen from the foregoing that the scraper is an important tool for coating photosensitive adhesive, and the quality of the scraper directly affects the quality of the screen printing plate. The following aspects should be paid attention to: firstly, the edge of the scraper in contact with the wire mesh must ensure high flatness and no traces of bumps. If the flatness is low or there are bumps, the coated film will have streaks or uneven thickness of the film, resulting in burrs and uneven thickness of the ink layer after printing. The second is that the edge of the cutting edge is required to be smooth. If this is ignored, it will cause the consequence of scratching the screen during coating. The third is that because the stretched wire mesh has a certain elasticity, the phenomenon of uneven thickness of the film is prone to occur during scraping, that is, the film is thick in the middle and thin in the four sides. In order to avoid such problems, the side that touches the screen is usually slightly arc-shaped when making the scraper, which can avoid the phenomenon of uneven film thickness caused by the elasticity of the screen. Fourth, when making scrapers, try to use stainless steel materials that are rust-free, corrosion-resistant and light-weight.
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