1Stencil printing and stencil printing â€” to remove the designed artwork from the tracing paper, and then copy the repeated artwork in each color copy paper on screen printing paper, and copy several silk screen printing papers in several colors before copying the silk screen printing. In the same way that the drawing paper is marked with the â€œ10â€ character on the tracing paper, and then the same size of screen printing paper is used to copy the upper and lower â€œ10â€ word school marking marks so that they can be produced. When the screen is screened in color, accurate matching of the color screen can be achieved. Copy the pattern of each color on the screen printing paper with a cutting knife, empty a silk screen printing plate to check on the original, check whether the blank silk printing paper matches the original, and empty the various colors of silk screen printing paper. Prepare the upper frame. Before the upper frame, each color of the wooden frame must be calibrated on the original, and then on each wooden frame, there is also a â€œ10â€ word mark. So that each frame can be accurately printed silk screen. The hollow silk screen printing paper is placed on a flat bench. The â€œ10â€ mark of the screen frame is aligned with the â€œTenâ€ mark on the printing paper. After pressing the guideline, the film with the hollowed out side should be faced with silk. The frame is wiped all the time, so that the film on the screen printing paper shrinks and adheres to the screen.
After the solvent volatilizes, check if there is no sticky place, and then use banana water to stick it firmly. Finally, gently peel off the plastic paper on the other side of the screen printing paper to become screen printing, and When engraving silk screen printing paper, only the side of the color film is engraved, and the force should be uniform. Do not etch the bottom plastic paper.
2 Photographic plate: Transfer the original to the transparent film or glass plate by pen tracing or photographing. The ink used for the tracing of the pen must use carbon ink. The positive film produced is a positive grain version, both on the manuscript and the positive film. To mark the "10" school registration marks the same way as before.
In the darkroom (dark room can only use red light to illuminate all other light sources will not work) The photosensitive adhesive (sold on the market), according to the proportion of deployment, coated with a brush on the nylon mesh, glue to the first coating of nylon yarn Mesh raised surface, glue requirements thin glue layer even without bubbles, glue at room temperature to about 30 degrees is appropriate, high film gum film breakfast, on the good after the adhesive to allow the glue to dry, such as drying temperature control at 30 The longest drying time for degrees ~35 degrees can not exceed 5 hours. The glue dries too dry, which makes it easy to fall off after photosensitivity.
Put the side of ink on the transparence film or glass and paste it on the side of the photosensitive screen coated with glue, and then perform the sensitization. The exposure time is 5 to 10 minutes (For the production of the photosensitive cover and the inspiration table, please refer to: Unetched glass face. , and then use 30~35 degrees of water to wash for about 30 minutes, brush lightly with a wool brush.Wash away the sensitive adhesive at the photosensitive area, brush with light brush after drying, if it is found that the mesh is not clear should be re-washed, After the stencil is in good condition, if it is used for a large number of times, it must be lacquered and reinforced. Apply lacquer on the front and back of the screen again. Do not block the mesh in the pattern and finish it.
The place with trachoma will be coated with lacquer. If the pattern is unclear or the mesh hole is blocked, the needle can be used to pass through. The reinforcement can use 40% formaldehyde 100 grams, potassium dichromate 25 grams, add water to 1 thousand ml, and make the chromium film harden. . Self-made photosensitive adhesive formulation: Grade A gelatin 25 grams, 8 grams of ammonium dichromate, 180 milliliters of water, 25% ammonia 3 millimeters long. Method of preparation: Place the above medicines in a dark room and mix thoroughly with 70 degrees of heat. The formula can be painted and reinforced. For example, the photosensitive adhesive sold on the market need not be painted and reinforced. The method of brushing is the same as above.
Source: China Dyeing & Finishing Industry Information Center
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