Oct. 18, 2022
1、 Causes and solutions of negative film deformation: Reason: (1) Temperature and humidity control failure (2) The temperature rise of the exposure machine is too high Solution: (1) Generally, the temperature is controlled at 22 ± 2 ℃ and the humidity is 55% ± 5% RH. (2) The exposure machine with cold light source or cooling device shall be used and the backup film shall be replaced continuously.
Oct. 09, 2022
The purpose of etching is to etch the unprotected non-conductive part of copper on the printed circuit board with patterns made in the previous process to form a circuit. The etching includes inner layer etching and outer layer etching. The inner layer adopts acid etching, and the wet film or dry film is an anti-corrosion agent; The outer layer is alkaline etched, and tin lead is the corrosion inhibitor.
Sep. 29, 2022
Huawei Mate 50 series has been officially put on sale, "sold out in seconds", in the first sale process, there is no doubt that the reproduction of "one machine is hard to find" the grand situation. Tiktok blogger Boge Review has been the first to take apart the Huawei Mate 50 Pro, giving us a peek inside. Similar to other smartphones, starting from the back of the body of the Mate 50 Pro, the back can be opened after heating. When compared with the Mate 40 Pro, the internal layout of the two phones is basically the same, but the camera position is different.
Sep. 21, 2022
Core tip: Many customers think that the film temperature and pressure should be increased to enhance the adhesion after the hole is broken in the dry film mask. In fact, this view is incorrect.
Sep. 15, 2022
Screen printing refers to the screen printing plate with pictures and texts made by using the screen as the plate base and using the photosensitive plate making method. Screen printing consists of five elements, screen printing plate, scraper, ink, printing stand and substrate. The basic principle of screen printing is that part of the screen can pass through the ink and part of the screen can not pass through the ink. When printing, pour ink into one end of the screen printing plate, apply a certain pressure on the ink part of the screen printing plate with a scraper, and at the same time move towards the other end of the screen printing plate at a constant speed. During the movement, the ink is squeezed from the mesh of the graphic part to the substrate by the scraper.
Sep. 07, 2022
What is the difference between gold plating and silver plating on PCB? The PCB used in the wide variety of board products in the market is a dazzling variety of colors. The common PCB colors are black, green, blue, yellow, purple, red and brown. In addition, some manufacturers have also developed white, pink and other PCB with different colors.
