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again, the need for a continuous 3-4 times, until the film reaches the desired thickness is reached, then the exposure.
(4) the temperature of the oven, it is preferable to use an adjustable temperature oven. The drying temperature sensitive adhesive, generally controlled at about 40 degrees, the baking time is too long or the temperature is too high, will affect the quality of the photosensitive layer.
(5) security lighting: studio lighting, generally used orange, yellow or red light as security lighting, but visually, the orange-yellow light comfortable. Its brightness to be able to clearly see all the articles is appropriate.
(6) Test negatives: on the bottom plate must be carefully checked before the copy, including the layout of dust, backplanes blackness broken lines missing, sand hole defects and other items of positive and negative images of text to meet the requirements.
B, the indirect method:
(1) Prepare the frame and the photosensitive film: good to stretch the frame (nylon with 220-260 purposes) with a 10% aqueous solution of sodium phosphate cleaning to remove oil. Wire mesh photosensitive film is a film of poly alcohol gel as the main body of photoresist, film is a film on a transparent plastic sheet 0.12-0.06 mm gelatin-based photosensitive agent is applied to the body, then prior to use graphic size, width on each side out of 20 mm, with a cloth to wipe off the powder dirt film.
(2) Exposure: the film within the film and the bottom plate is pressed against the plate, with exposed carbon lamp or a xenon lamp. Distance between the screen frame and the light source is 50-60 cm, exposure time 2-6 minutes.
(3) Development: After exposure, the Philippine film on the plate, with warm water for 1-2 minutes
