Large-scale screen production process and precautions

First, the application of large-scale screen

The large-scale screen can meet the screen printing of large-scale patterns, and it is particularly advantageous for large-scale decoration. Such as textiles, such as fabric sheets, curtains, carpets, fabrics and other fabric printing; arts and crafts, billboards, large-scale hanging, posters, billboards; large-scale decorative decoration of large aluminum alloy, copper, iron and other whole metal plate Directly printed on a variety of patterns; can also be used in large-scale glass printing paste etching, so that a large glass surface shows a matte effect, and can improve efficiency and reduce costs.

Second, the choice of frame material

The use of aluminum alloy, wood, iron frame making net frame, the material strength is hard to deform. 1. The frame is made of aluminum alloy with stiffeners. 2. The large wooden frame is reinforced with 3# or 4# angle iron around it to increase the strength.

Third, the production of the screen

Stretch net

The use of two hand-screw tensioning machines together to use a large-scale screen is an economical and practical method of stretching the net and can achieve satisfactory results. Pneumatic stretching machine used to stretch large screen requires a lot of chucks, equipment investment.

2. Film production

When lower-precision screens are produced, the negatives can be drawn on tracing paper to create negatives, which can reduce costs. Another production method uses a computer engraving machine to engrave the required text, patterns (black sticky notes), and paste it on the glass to make plates. High-precision screens can be exported using the A3 laser machine and then converted into large negatives.

3. Screen cleaning

The cleaning of large-scale screens is mainly carried out by hand, and two self-made spray pipes with the same width as the screen (one-half hole drilled by 1/2-inch iron pipe) can reciprocate up and down, and can also be flushed with a high-pressure water gun.

4. Screen drying

Many people cooperate to dry the screen plate by using a hair dryer. During operation, the hot air outlet of the hair dryer should be kept at a certain distance from the screen plate to prevent the screen plate from being locally damaged by heat. Can also be used electric heating plate, electric stove, electric heating and other drying.

5. Photosensitive adhesive

The tension in the middle of a large screen is smaller than the two sides. In order to ensure the uniformity of the edge of the screen and the center of the adhesive layer when coated on the photosensitive adhesive, the edge of the adhesive applicator can be made into a slightly convex arc shape. The screens that have been coated with photosensitive adhesives after drying should be protected from direct sunlight.

6. Sensitive

When the overall pattern of a large screen is segmented and gradually exposed to light, the light-sensitive part and the unsensitized part are covered with black paper (cloth), and after all the sections are completely dried, they are tested under the same conditions. The appropriate exposure time, and then large-scale printing.

7. development

Can first wet the screen, then use the version of the spray gun, water gun version, or spray with a human sprayer, after the development of clear, and then use the pot water screen splash, drifting away glue. Until all the graphics appear.

8. Revised, closed net

According to the original repair pinholes and should not leak the ink, if there is a little missing lines, the pattern is like through the impenetrable, use a small amount of paint remover, carefully trace lines, patterns. A few minutes later, the screen was sprayed with clean water until the mesh screen was completely transparent.

Fourth, screen printing operation

1. Adding materials

In order to apply the printing material on the screen in segments, after scraping with a squeegee, the printing material is immediately dispersed on the entire screen plate with a squeegee.

2. Scraper and function

Available 8-12mm oil thickness glue scraper self-made scraper, scraper handle to be as thick as possible.

Two people simultaneously operate the squeegee so that the middle and the edges of the screen are pressed evenly. When scraping the ink, one end of the squeegee is grasped by one hand, and the other hand grips the middle of the squeegee. The speed of the squeegee is consistent.

Source: Coinprint