High-quality screen printing application technology (on)

The pursuit of high quality screen printing, as screen printing workers, should first have the right quality concept. Second, there should be good work habits: for example, the working environment should be kept clean. All appliances are well maintained. If you do not have a vacuum cleaner, do not use a brush during the cleaning work to avoid flying dust. Cleaning of the floor, cleaning of tables and utensils requires the use of a damp cloth. Clean working conditions can improve the quality of work and also improve the working environment. It helps to achieve the high quality of screen printing.

Negatives: Before we start printing, we need positive negatives. What are the requirements for a good negative?

The film base and polyester film of the film must be highly transparent.

The film surface should be on the front of the film. We often find that some users use the negative film on the reverse side of the negative film, and use it for offset printing. The quality of the negative film will not be guaranteed. Because the silk screen printing plate requires the image of the film side of the film should be in close contact with the photosensitive layer of the film.

Density (density = darkness) needs to be greater than D3. Offset uses less than D3 positive film. Therefore, the densitometer is required to measure the density of the positive film.

Density of images and texts across the negatives requires higher values. Hand carved masks should not be used as screen printing plates. The backsheet should be made using a hard-height photographic film.

Before using a negative plate, it is necessary to clean it with a detergent or a dust roller.

Nowadays, many negatives are made using a laser photocopying system, so it is usually possible to produce positive-quality negatives. Some manufacturers use desktop computers and laser printers to make negatives. This is a fairly simple way to make negatives. It is designed using a computer and printed on a special film using a laser printer to print the desired image and text. Negatives.

Wire Mesh: The screen used for screen printing is not an ordinary fabric but a high-strength material with very small tolerances. For example, we may all know that in a screen of 120 mesh/cm, there are 24,000 meters of wire per square meter, or 14400 holes per square centimeter, but in fact there is much more to this knowledge about screens.

SEFAR PET1000 mesh has:

1, high tension

2, the lower tension loss

3, high tension stability

4, good wear resistance

5, low water absorption

6, good resistance to acid etching

At the same time, the textile structure of the screen is also very important for screen printers. You can find the required technical specifications in the technical documentation. What is the benefit of knowing all these data? Let us look at the relevant data:

1, wire diameter: It is the index that determines the final imaging ability.

2. Mesh/CM: The strength and possible tension of the screen can be determined because the effective cross-section and wire diameter of the screen per cm determine the relative stability of the screen. Both of these factors also determine all other parameters. Such as the thickness of the screen, the size of the opening of the screen, the open area ratio of the screen.

3, the thickness of the screen and the opening area determines the amount of ink, and the theoretical volume of ink penetration. The theoretical ink-permeation volume is useful for comparing screens of different brands, different meshes, and different wire diameters. It can also show the amount of ink consumed for a particular job.

PA2000: I would like to mention here a special wire mesh PA2000 specially designed for tile printing. It is made of high-strength fibers, which can reduce the tension loss better and improve the positioning accuracy. At the same time, the number of prints is at least twice that of ordinary screens. In other words, it has a very high abrasion resistance.

Net frame: We all know very well that only a solid frame can control the entire printing process. For example, the magnitude of tension loss and the degree of tension stability.