Silk Screen Printing Screen making the request and its technology – screen, scre
Screen printing plate a lot, also has its own advantages and disadvantages, we are now printing plate using the photosensitive plate main method of indirect method. It is the use of light-sensitive chemical changes in pulp, that part of light generated by the photosensitive paste hardening and cross-linked together to form combined with the screen version of a solid film, is not sensitive portion of wash water or other imaging developer solution to form a through-hole made of wire mesh printed version.
First version should be chosen to match with the phase screen wipe, wash with a high efficiency, water repeatedly washed, dried in the air inactive. Then the deployment of good photographic paste evenly brush the wire-line, the screen placed in 60-65 in the oven, bake 10-13 minutes, then brush again evenly photosensitive paste, dried in the oven, out to be exposed, drying time is too long or too high will cause imaging difficult, off-grid difficult, contrary version of film is not strong, the exposure is not through.
In response to bottom plate before exposure for an inspection to see whether the smooth edge of bottom plate, clarity of writing, with or without scratches, dew point and other phenomena, then Plate For exposure. Phase version in place should normally be placed in the network's central site can also be printed according to the actual demands placed on their own. To achieve good plate edge effects, the angle generally better with net wire 30 degrees, straight Stretching should be Network box Completely vertical, it is necessary to avoid the web version of the holes and bubbles and other blemishes. Must pay attention to the front and back papers of film to prevent the network system against. In the light of the most important part is to closely mesh with the bottom plate attached to prevent the drying out of the plan made false or even scrapped.
Exposure, the light from the plate should be the actual map of the diagonal prevail (for information), the exposure time to determine the extent of bottom plate of the fine. With the plate (single lamp 2000W) should normally be from 80 to 100 seconds is appropriate. Perspective should be carefully wiped off the glass. Develop a long exposure time difficult, time short-film is not strong, developing easy to fall off easily when the formation of jagged edges.
Imaging: the screen light exposure through immersion in water 12 minutes (30 -40 warm water better, to shorten the development time), to keep Akira Network Edition and other sensitive parts are not fully absorb the water expansion After the Run, you can rinse with high water, etc. proofing and graphic appears, contrast should be completed in a short time. No matter what kind of screen is not sensitive parts must be completely clean.
Imaging degree of control principles: transparency and imaging in remarkable premise, the shorter the better. Too long, the film moisture expansion seriously affect image clarity, and easily lost, easily broken version of film; time is too short, imaging will not completely leave Mongolia nebula (that I glue) cause waste Edition. I was very thin layer of glue Sensitive adhesive Residual film, easy to image details of the Department in a highly transparent, difficult to distinguish, often mistaken for significant penetration, and printing inks can not.
Out after developing the screen dry with absorbent paper or newspaper network version of the water, flat home at 60-65 in the oven drying out. If there are hole points, or some version of the opening should not be used close up some plastic to make the appropriate remedial treatment (drying time should not be too long, otherwise the screen will cause difficulties in re-use when stripping).
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