In large quantities of nets printing production process, if a specific link a bit not advertent, can bring a series of trouble to production, and this situation, one day does not solve, will has been plagued by production.
Here is the main production often encountered and extremely easy to ignore several problems were discussed.
-the color of the screen
The color of the screen with a white, yellow, red, amber, among them with yellow silk screen is preferred. We produce in common use in Japan or Germany import of the 270 ~ 280 T yellow silk screen, for special delicate prints, we used to use 350 T of imported yellow silk screen.
Why should use yellow silk screen? We know, nature of the gorgeous colour all is caused by the role, no light is no color, the color of the light is the frequency of the decision by the light waves. Red, orange, yellow, green, blue, basket, purple is people visual nerve can feel light, called visible light. The object surface selective absorption of light and reflection and get a different color, in short, we can see the color is the color of any light. That is when a ray of light exposure to yellow object surface, only yellow light is reflected, stimulate our visual nerve and color, and other color are absorbed, so we see the color of the object is yellow.
Due to the nets < a hreef=http://www.printing-in-china.com title="printing china">printing in sun exposure, the version is ultraviolet light, and purple light is green and magenta color by the two kinds of hue of mixed reflects light, and that is the lack of yellow hue in black. In the exposure, purple and yellow is stack of screen into black, so yellow silk screen surface (namely the bottom of the emulsion layer) not photographic or less exposure, so it won't appear "back sun" phenomenon, obtained image high-definition, won't produce dizzy shadows.
What is sun back? That is when the light passes through the transparent parts of the film emulsion to layer, located in the central part of the layer in coating or the bottom of the screen of white occurs on the surface reflection refraction and the phenomenon such as xu haifeng, just from the bottom and inside coating exposure, this phenomenon is called "back up. It can cause exposure produce virtual dizzy, the influence of representation of the tone.
Second, coating of photographic emulsions
Will made good photosensitive liquid into the stainless steel vats, photosensitive liquid accounts for about half of the slot. Coating tank and the tilt of the lower screen contact, make out side tilt sensitive liquid trough, side slowly and evenly up along the screen to the groove surface coating. Speed can not be too fast, too fast coating can cause emulsion membrane surface bubbles, can produce pinhole; Users can cause of photographic emulsions coating not divide evenly. In order to obtain the best coating, it is best to effect from printing contact with that side of the coating, coating should be on area than a smaller screen box, and then some will net edition upside down again, finally, a coating net edition opposite coating for drying after, so that emulsion with nets holes. With 30 to 35 ℃ hot air drying for best, so can shorten the drying time. If the temperature is higher, more than 40 ℃, nets version will produce hot HuiWu phenomenon.
Emulsion liquid phase in low mode, the mode of coating film with dry and rise, the ability after dry completely meet the prescribed mode, so bask version should make before and after dry, dry finish drying short version.
Of course, as a result of each production factory production condition is different, the coating method and number are also different. Our factory adopted coating method is a one-time coating is in place, that is, all three times, and then back on dry.
Due to the page layout from dust can make nets version, so be produce pinhole indoor clean. At the same time must deal with bad screen can also cause nets edition surface needle too much. Photographic emulsions coating, dry place too bright, can make whole net edition images generated the hair of the mist, influence on the clarity of the prints and saturation.
Our nets printing is mainly producing daily-use ceramics decals, to export products, domestic products of services. Perennial export the United States, Britain, Canada and other countries 20 head set tableware, noodles bowl and cook dish, highly preferred.
Three, plate burning, trim
Bask version, should first check before photographic film of face and sun version of the glass surface if there is a dirty work or dust, best first dip in with cotton yarn alcohol is wiped clean again after work. A kind of film surface adhere halogenating silver as positive, piece of the peculiar burnish side for the opposite. Bask version shall be the YaoMo face film and nets version of the emulsion was set aside, joint surface bite line for exposure. The exposure time should be according to the type of photographic thorn, photographic film coating thickness, Yang picture black degree of compaction and printing request. The photographic film coating layer of the thick, need exposure time is long, so that some corresponding edition film completely cured. If Yang in the picture graphic black enough, is real in gray and not black, should be shorten the time exposure, accordingly, so as to extend the development time not the graphic photographic part completely fully.