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Manual screen printing process is simple, no expensive equipment can meet the requirements of screen printing, less investment, good quality and high efficiency, in the screen printing industry, it still has a considerable advantage. Manual screen printing process now its three parts are outlined below for screen printing counterparts beginner reference. Network PCB Printed version of the operating network is technically engraved plate and photosensitive film printing down the hours, depending on the printability of substrates to choose a different plate methods. Patterns of network such as text line printed paper version can choose to carve film, continuous tone level Patten Screen Printing option of hanging on photographic printing down version of the rule of law. Now on its plate method described below. One engraved print edition film network (A) of the coating formulation and production of paper 1, lacquer coating formulation and production of paper Formula 100 grams of soft clean paint Super banana water or butyl acetate 200? 300 grams Castor oil 4? Six grams Operation The tracing paper or cellophane attached to flat wood or glass, the rubber Glue Petrol 1:1 deployment of uniform, with a shading brush to brush on the paper barrier until the dry spray, spray when the spray gun about six seven inches from the paper is appropriate; spray can be seven or eight times. Thickness by the master himself, the general lacquer on paper can be prepared thick, medium, thin three types. Spray the first layer to be slightly dry before spraying the second layer, third layer ......, If you make less, the system can also be used shading brush. Soft clean paint is colorless and transparent, and in the production of lacquer on paper, it must be paint stained, that is to add a little velvet painting or magenta, light green color, easy to stereotype when the resolution, color should light, not too strong, otherwise the impact of sight when engraved, dye to be dissolved with alcohol. Castor oil painting performance should the weather change and changes in weighing. Dibutyl substitute for castor oil, castor oil, but not as good. 2, gelatin film formulation and production of paper Formula Grade gelatin 20 g Water for 100? 300 grams Glycerol 3? 7 grams Operation The gelatin into full bloom with a container of water in cooking to melt, then add a little glycerin and dye velvet, fully stirred with a glass rod, with over 100 mesh screen filter. The polyester film-based paste in a flat piece of wood or glass, and with the shading brush-off plasma and ring B vinyl ketone solvent for brushing isolation layer on the paper, when dry spray or the system can use shading brush (the same way as before). Allowed to naturally dry, dry and ventilate Department placed the deposit. Preparation when the temperature exceeded 180 , it can add 1 gram of sodium sulfate. 3, nitro-lacquer coating modified the formula and production of paper Formula A side 10 grams of nitrocellulose 90 grams of butyl acetate 50 grams of ethyl acetate 10 grams of butanol 40 grams of toluene B side 12 g melamine formaldehyde resin 20 grams of castor oil modified alkyd resin Operation A and B sides to reconcile parties, adequate mix well. How paper with lacquer coating and heating at 120 for 2 hours can be engraved plate. (B) carve paint paper Will be issued into the film depicting the good ink on paper below well with cellophane tape, printed with the graver part of the film removed from the mount out. Multi-color engraved, to carefully examine the drawings, to distinguish the sequence of overlapping colors. To prevent walking Edition, carve the first time original larger in scope than chromatography, the second set of color range and manuscripts and other large, so that after printing is just consistent. First India to carve a little wide, after the engraver to India and other large. Also engraved contour line, contour line pressure is that color should be on the Road, one half outside of the office, contour lines are engraved and original samples have to be equal. (C) Stretching Wire and wire mesh should be based on the choice of substrates, the version method, the nature of printed material selection flexibility, print fine graphics may use 130? 150 mesh screen, graphic printing can be coarse use 100? 120 mesh, gelatin film version of paper on the need to use temperature may make use of silk screen, lacquer coating paper version of medication water, the version without the temperature, so better to use nylon mesh. With Stretching machine or hand-stretching method, the wire stretched in the box line, a good stretch mesh should be smooth, elastic medium, and screen wipe both sides with oil and dirt track glacial acetic acid. More exciting, please see>> I am an expert from huawo-projectorlamp.com, while we provides the quality product, such as Replacement Projector Lamps Manufacturer , Replacement bulb, Lcd projector lamps,and more.
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