Mass-prone print problems in screen printing

In the large-volume screen printing production process, if a specific link does not pay attention, it will bring a series of troubles to the production, and this situation will not be resolved a day, it will always plagued the production of printing plates, repair the printing plate Before, you should check the photosensitive surface of the film and the glass surface of the printing station for dirty work or dust. It is best to clean it with cotton and alcohol before cleaning. The surface of the film with silver halide attachment is frontal, and the glossy side of the film is negative. When printing, the film surface of the film and the emulsion surface of the screen should be closely attached, leaving the bite line for exposure. Exposure time should be based on the type of photosensitive thorn, the coating thickness of the photosensitive film, the degree of blackness of the positive picture, and the printing requirements. The thicker the coating layer of the photosensitive film, the longer the exposure time required for the film to be completely cured. If the image on the Yang picture is not solid enough, ie gray but not black, the exposure time should be shortened and the development time should be extended accordingly so that the unilluminated image part is completely transparent.

After the development is completed, the surface of the screen should be quickly removed with a sponge or a highly absorbent paper to perform hot air or dry naturally. If the heating temperature is too high during drying, the image on the printing plate will produce errors to a certain extent or cause the screen plate to loosen, affecting the overlay accuracy during printing.

In order to strengthen the stocks, improve the water resistance and solvent resistance, and prevent the joints of the screen and the frame from leaking ink during printing, the edges of the graphics may be wrapped and reinforced with a wide tape, and plugged with the sealant or emulsion. Bonding sites, pinholes on the screen, and unwanted openings. For the small stain on the pattern part and a little of the sensitized adhesive, you can use a wide tape to stick it, you can also use light cyclohexanone or alcohol to gently wipe it, you can also use a small needle to gently point, make the screen to keep Transparent. However, the action is soft and gentle, and the action is too large and will damage the screen.