Talking about the PCB plate making process
With the continuous development of the label printing industry, it has evolved from the previous common jobs to multi-color multi-color, and the self-adhesive printing machine has also turned from single-sheet paper to full-automatic web color printing. There are two processes for printing plate making in self-adhesive printing machines: flat pressing and round pressing. Flat press is used for both hard and soft substrates (polyester base) in the selection of plate materials, but for round flattening, only plates with polyester base can be used to achieve the best printing effect . The following describes the plate-making process of the resin plate.
First introduce the equipment for plate making. The resin plate making machine is composed of four systems: exposure, vacuum, plate washing and constant temperature drying. The light source of the plate-making machine is usually a side-by-side black light group, and the output power of the light source is about 360 nm. The purpose of the vacuum of the plate-making machine is to make the film closely match the plate material, and the resin plate after exposure will not be distorted. The plate-making machine washing system is composed of a stainless steel washing tank and a soft and hard brush and a motor. Bidirectional plane rotation. The drying box of the plate-making machine requires uniform heating, good circulation, and an automatic constant temperature device to avoid overheating.
1. Film production
Film production uses a camera to take pictures, or uses a computer to typeset, and uses a laser to typeset and distribute. Usually, a negative picture, that is, a negative picture of a positive character (negative film) is seen when the medicine film is facing upward. The density of the light-transmitting part of the film should be less than 0.05, and the density of the light-shielding part should be greater than 3. If it is lower than this standard, it will cause the exposure of ultraviolet rays to penetrate the film, so that the graphics will not be processed to the end. Do not crease the film. Color network cable jobs usually use electrical extension, or laser phototypesetting machine to release film.
2. Plate making process
(1) Exposure
First cut the plate material according to the size of the film. The plate material should be larger than the film by 2-3mm. The vacuum film must be cleaned. If there is dust and stains, use ethanol to remove it. Remove the protective film on the plate, so that the drug film surface of the film and the drug film of the plate face each other. Open the vacuum suction to line up the air between the film and the plate. Order the required exposure time. (This time is determined by the light source intensity of the plate-making machine lamp and the size of the plate-making font. If a plate has both large and small fonts, the exposure time should be determined separately: the exposure time for large characters is short, and the exposure time for small characters and thin lines is long. The large part is covered with a mask. When covering, the vacuum pump cannot be turned off to prevent the plate from drying out.
(2) Flushing
Paste the dried plate with double-sided adhesive tape on the automatic washing plate for two-way automatic washing, and wash the plate to the base of the plate (the washing tank must be filled with fresh water before washing and the washing temperature must be set).
(3) Drying
Use the sponge to absorb the floating water on the surface of the plate, and put it in a drying box for drying. The temperature is generally set between 60-70 ℃. The time is 10-20 minutes.
(4) Post exposure
After drying, the plate should be exposed again, so that the part with insufficient photosensitivity and incomplete curing is completely cured in this process, so that the plate can meet the required hardness standard.
Pet Nest,Small Dog House,Wooden Dog House,Extra Large Dog House
DongGuan Baby-Plus baby ware Co., Ltd. , https://www.baby-plus.com