Analysis of common faults of the most popular dire

2022-08-19
  • Detail

Analysis of common faults of direct legal version

fish eye bulge after gluing. The reason is that the degreasing treatment of the silk is not complete before greasing, or there are dust particles on the silk. Therefore, it is necessary to check whether the degreasing treatment of silk meets the requirements, and pay attention to the cleanness of the environment

bubbles appear during gluing. This is mainly caused by improper operation in photosensitive adhesive coating. If the glue applicator runs too fast, air will fill the hole and form bubbles. In addition, the general thick wire is also prone to such problems. Pay attention to the coating skills of photosensitive adhesive and the selection of silk

the photosensitive adhesive layer is not firmly attached after exposure. The main reasons for this failure are: the photosensitive adhesive layer is not completely dried before exposure; The exposure time is too short, which may be caused by the fact that the positive negative film absorbs a large amount of light, which is not fully estimated; The use performance of the exposure lamp is not good enough, and the light energy is insufficient, so the optical integrator should be used during exposure; The photosensitivity of photosensitive emulsion is poor, the diazo component is not completely dissolved in water, and the sensitizer component in the diazo component must remain insoluble in the bottle; Note that the air humidity is too high, and the coated silk template may be completely dry by hand. In fact, due to the high air humidity, the template is not completely dry. In this case, the exposure time of the template is longer in the two major industries where the use of thermoplastic materials has shown significant growth

when printing, the import of bauxite and laterite nickel ore decreased by 49% and 33% year-on-year respectively. The fine level of the printing plate image is lost, which is easy to happen when using white silk. Using orange silk can avoid light scattering to the greatest extent. However, compared with white silk, the exposure time of dyed silk is increased by 75% - 100%

sawtooth effect. The photosensitive emulsion cannot be scratched well, and the photosensitive adhesive layer on the printing surface may be too thin. To print clear image edges, the photosensitive emulsion must be wet to wet coated. In any case, the photosensitive adhesive layer on the printing surface must be thicker, and the photosensitive emulsion shall be applied after drying to prevent the surface of the photosensitive adhesive layer from being uneven

difficulty in film removal. After printing, the ink was not washed out in time. After printing, the printing plate was not thoroughly washed, and part of the ink was dry and fixed on the silk plate. After a period of time, the dry and solid ink particles could not be completely removed. Because the solvent can't increase the cost to obtain products for waste treatment, the template is still oily, and the stripping solution can't dissolve the photosensitive glue. Therefore, degreasing treatment must be carried out again before stripping. And ensure the use of appropriate film removal solution. DSM is committed to developing templates for various plastic materials suitable for electronic and electrical appliances. If you use water-based ink directly, you must use water-resistant photosensitive lotion, and carefully check the manufacturer's product instructions

halftone printing. When using a printing plate with a thick photosensitive adhesive layer, too much ink is attached during printing, especially in dark image areas. This will cause individual points to adhere to each other. Halftone printing requires that the photosensitive adhesive layer of the template is thin, and the times of scraping photosensitive adhesive can also be reduced if necessary

source of information:

Copyright © 2011 JIN SHI