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Exposure machine is a machine that transmits image information from a film or other transparent body to a surface coated with photosensitive material by turning on light and emitting ultraviolet wavelengths. In the printed circuit board manufacturing process of the exposure machine, one of the most critical processes is to transfer the negative image to …
PCB edge beveling machine operation manual: A. Unpacking and installation When unpacking, first check that the outer packaging is not damaged. If there is any damage, contact our factory. If there is no damage, open it carefully. Put the machine into a suitable position, and adjust the feet to a level. Check whether the machine …
Why is there side corrosion in the metal etching process? The two most critical and at the same time the most important parameters in metal etching. The etching speed determines the length of the etching processing cycle. The faster the etching speed and the shorter the etching processing cycle, the higher the production efficiency, and …
We often see large and small holes on circuit boards. Holes can be roughly divided into PTH (Plating Through Hole) and NPTH (Non Plating Through Hole). “It’s because this kind of hole really penetrates from one side of the circuit board to the other. In fact, in addition to the through holes in the circuit …
Etching machines can be divided into chemical etching machines and electrolytic etching machines. In chemical etching, a chemical solution is used to achieve the purpose of etching through a chemical reaction. A chemical etching machine is a technology that removes materials by chemical reaction or physical impact. Automatic etching machine: The automatic chemical etching machine …
PCB circuit board tin spraying, also called hot air leveling, is an important process in the production of PCB circuit boards. The surface treatment of PCB circuit boards can be divided into two types: lead and lead-free: Lead HAL The so-called lead-sprayed tin refers to the tin in a certain proportion, and the lead will …
The developer of the water-soluble dry film is a 1-2% anhydrous sodium carbonate solution with a liquid temperature of 30-40°C. The development mechanism is that the active groups in the unexposed part of the photosensitive film react with the dilute alkali solution to generate soluble substances and dissolve. During development, the active group carboxyl-COOH interacts …
The difference between electroless gold plating and electroplating gold (electroless gold plating is also called immersion gold; gold plating usually refers to electroplating gold). 1.The difference in principle FLASH GOLD (electroless gold plating) uses the method of chemical deposition! PLANTING GOLD uses the principle of electrolysis! 2.The difference in appearance Electroplating gold has electro-gold leads, …