Faults and causes of direct plate making 1. The loss of the sensitive film in the development cannot make the plate. (1) Under exposure. (2) The dosage of photosensitizer is insufficient or invalid, and the sensitivity is reduced. 2. The whole image produces light gray. (1) The working place of coating and drying process of photographic solution is too bright. (2) Insufficient exposure time and development. (3) Part of the photosensitive coating and drying, over heating. (4) Exposure time is t
The quality of the printed matter is determined by the quality of the printing screen. How to make a high-quality printing screen is a direct issue for the printing enterprises to consider. Now let's understand the process of screen printing. Generally speaking, the production process of screen making is different because of the different photosensitive materials used. However, no matter which process is adopted, the following steps are indispensable in screen production: screen and fra
There is no ink on the surface of substrate (uneven ink leakage), the reason is: 1. The mesh number of the screen is too high, and the ink permeability is poor. 2. The sensitive film is too thick and the ink permeability is poor. . 3. There are scars on the blade of the rubber scraper. . 4. The pressure of the rubber scraper is not enough or uneven. . 5. The gap between screen printing plate and substrate is too
1. The screen printed PVC of PVC plastics was put into industrial production in 1931. PVC plastics have the advantages of bright color, not easy to crack, acid resistance, alkali resistance and low price. However, because of the toxicity of some auxiliary materials, PVC products are not suitable for food. PVC film has a wide variety of designs and colors. Most of the colorful plastic cloth and artificial leather sold in the market are PVC products. 2. ABS plastic screen pri
There are generally several printing methods for fabric printing: 1. Pigment direct printing is to print the prepared printing paste directly on the fabric, which is the most simple and commonly used process in the printing process. Coating direct printing process generally refers to printing on white or light colored fabrics, which is convenient in color matching and simple in process. After printing, it can be baked and applied to all kinds of fiber fabrics. According to the commonly
The screen is divided into metal screen and chemical fiber screen. Its name includes screen, screen, screen, etc. it has various specifications and wide uses. In screen printing industry, screen yarn is needed for drying screen plate. The mesh number of screen yarn is selected according to the requirements of printing materials. "Mesh" refers to the specification unit of wire mesh, which refers to the number of holes in the length of 1 inch (25.4mm). Mm is a simple unit of