Silk screen printing production process includes multiple links and steps.If a don't pay attention to these links and step will produce a series of problems, a series of trouble.Such as:
Why after the sensitive glue screen must be completely dry?
Because if photosensitive inside rubber with slightly moisture, moisture can arise when exposed to light refraction, which affect the emulsion crosslinking degree.Another sensitive glue not dry thoroughly Will also hinder the crosslinking, leading to screen in the time of exposure after development of pinhole, degumming and sub and screen adhesion drop, less resistant to seal and other ills, therefore, before the exposure of photosensitive layer dry degree is very important.
And about the color of the wire mesh, wire mesh color varied, basically have white, yellow, amber, red and so on, with yellow silk screen is preferred.For particularly delicate printing, we often use import yellow silk screen.
Why use yellow silk screen?We know that the nature of gorgeous color is a function of the light, no light, no color, the color of light is decided by the frequency of light waves.Red, orange, yellow, green, green, blue, purple is the light of the people can feel the optic nerve, called visible light.Surface selective absorption and reflection of light and get a different color, in short, we can see any color is light color.When a beam of light to yellow surface, only the yellow light is reflected, stimulate the visual nerve of us and color, and other light is absorbed, so we see the object's color is yellow.
Due to the exposure in print, screen printing using ultraviolet light, light is by the color of blue and purple hue magenta two hybrid reflected light, which means a lack of yellow hue in the black.At the time of exposure, purple stacked plus yellow silk screen is black, so the yellow screen surface (that is, the bottom of the emulsion layer) is not sensitive or less exposure, so there will not be back "tan" phenomenon, the high image resolution, won't produce halation.
Will make a good coating solution put into stainless steel vats, coating solution accounted for about half of the tank.Coated screen bottom contact with inclined trough, while tilting groove outflow liquid photosensitive, slowly and evenly to slot upwards along the screen surface coating.Coating speed cannot too fast, too fast will cause emulsion foaming, the membrane surface can produce pinhole;The slow cause emulsion coating uneven.In order to obtain the best effect of coating, it's best to start out with substrates contact printing that side of the coating, coating area should be a little smaller than silk screen box, and then coated screen upside down again, and finally to screen opposite after coating is dry, so that the emulsion with mesh.With 30 ~ 35 ℃ hot air drying is the best, so that we can shorten the drying time.If the temperature is higher, more than 40 ℃, the screen will produce hot phenomenon of fog.
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