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Polyester Bolting Cloth step detailed version(4)

Seven, Polyester Bolting Cloth coating

1, photosensitive material selection

At present, there are two kinds of photosensitive materials used in the market, one is photosensitive adhesive, and the advantage is that the process is simple, economical, practical, and the exposure speed is fast, the screen is durable, the film is easy to remove, and the solvent resistance is excellent. The other is photographic film, which is a pre-sensitized photosensitive material that is attached to the screen before exposure to the screen. It has hydrophilicity, strong resolution, sharp lines, strong durability and excellent performance. In the photosensitive adhesive, it is commonly known as "water film" because of its hydrophilicity.

Generally speaking, the requirement for printing on photosensitive materials is that the printing film formed by the photosensitive material should be suitable for the performance requirements of different kinds of inks, and has a considerable printing durability, can withstand the considerable number of scraping of the squeegee, and the screen The bonding force is good, no filming failure occurs during printing, and it is easy to peel off, which is beneficial to the recycling of the screen plate material.

2, coating

Required items: photosensitive glue, sizing machine (scraper), rack net.

The photosensitive paste on the market needs to be called by itself. The photosensitive powder can be conditioned with hot water, then poured into the photosensitive syrup and thoroughly mixed. It can be used after a few hours. The small factory can be sizing by the plate making workers, while the large factory has an automatic sizing machine with a very uniform thickness.

Place the dry, ready-to-use mesh on the coating station, place the screen in a stable position, and pour the photoresist into the bucket. (Note: appropriate amount)

Use a scraper to apply the photoresist evenly on the screen, first apply the printing surface (convex surface of the screen), then apply the ink surface (concave surface of the screen), usually three times per side.

The web is then dried and the process is the first. (Note: Line and character screen printing need to be coated twice) · If thick screen is required, it can be applied in multiple times, that is, after the first glue, immediately put it into the oven at 30-40 °C to dry. Remove the screen and apply the glue again. According to the required thickness, determine the number of times of coating. Note that the general printing surface (convex surface) should be coated 2-3 times more than the ink surface (concave surface). This operation is the second coating. (Note: This coating is only carried out on the contact surface of the screen)

Dry with a hair dryer or oven, do not have a dry or dry phenomenon, so as not to affect the quality of the plate. (Note: peeling off the photoresist)

Note: The gluing process is very important. The quality of the screen is good or bad. It depends on the glue, and the thickness of the plate is required to be uniform and uniform.

3, dry

After the silk screen photosensitive adhesive is applied, let it stand for 1-2 minutes, then put the wire into an oven at about 40 ° C for drying, then take it out and put it in a dark frame for use.

Note: The screen must be dried, otherwise it will affect the robustness of the screen.