Silk screen method
At present, the market network version of the process because of its raw materials, production process is different.We have learned, used to make web version of the technology on the market at present there are mainly two types: direct method emulsion liquid type, the direct method of film, in the process of the sensitizing type as a result of the characteristics and function of the two process is different, its operation process is different.
A, liquid type direct method sensitive glue
Sensitive glue process of the method is simple, economic and practical.Its characteristics are fast exposure and screen are durable and easy to membrane, excellent solvent resistance, its production process is:
Net processing and optional network to match glue to glue, drying, exposure and development - >
Its work environment is 15 ~ 20 ℃ temperature, relative humidity is 50 ~ 65%, under the yellow light darkroom operations.
Does the net processing and network
New screen before use must use grinding paste processing on the net, net each screen with a thoroughly degreasing degreasing agent, specific operation method is water wet silk screen on both sides, coated with grinding paste or degreasing agent, then apply evenly with brush and let stand for 1 minute, finally rinse off with clear water.
Used by the network if no longer use, can use remover soak, then wash clean, must do degreasing process before use.
Screen cleaning, drying processes.System network can choose according to need net dozen mesh, screen printing line generally use 120 t/cm, resistance welding of 100-120 - t/cm, characters of 100-120 - t/cm, 43-120 - t, carbon bridge oil seal stripping adhesive 18 to 36 t.
Does with glue
Direct method sensitive glue on the city at present there are two types: one is single fluid type, this type is the sensitizer direct preparation of the photosensitive glue in production, can be directly used types;The other is a "dual curing photosensitive glue.The photosensitive glue must be configured before use, namely the sensitizing agent adding suitable amount of water in photosensitive glue after even mixing, through the up and down or so fully mixing, the configuration is complete.With glue work finished at least two hours before use, is the best way in one working day before coming off work before with good adhesive, which work the next day.Remember, with good adhesive must let stand for 2 hours, just can use to glue the foam disappeared, otherwise there will be unexpected quality accident.
Does the glue
Dry the good to stay with the net placed on the glue, combine the right amount of photosensitive glue scraper, the first coating printing surface convex (mesh), paint and ink surface concave (mesh), general each 3 knives, thick screen if required, so can be divided into multiple besmear to brush, namely after the glue for the first time, immediately into 30 to 40 ℃ baking in the oven, remove the silk glue again, according to the required thickness, decided to glue, pay attention to the general printing surface (convex (concave) than ink surface besmear more 2-3 times.
Coating process is very important, screen quality, on glue, all requirements section thickness uniform, have stereo feeling.
Does dry
After the printing photosensitive plastic coating, first let stand for 1 to 2 minutes, and then put the screen in around 40 ℃ baking in the oven, drying out in the dark frame.
Note: the screen must be dry, otherwise will affect the network version of robustness.
Does the exposure
The film film release.it stickers (convex) on surface of the silk screen printing, and then put inside the vacuum exposure machine exposure.Exposure time according to the thickness of the sensitive glue, and exposure to light energy and the system of network version of the requirements (general line, resistance welding, characters, different screen exposure time requested), generally before use to use the slide rule to determine the exposure time exposure, and then fixed by the system of network version of the exposure time.
Note: the exposure time is too short, can cause sensitive glue is easy to fall off, line coarsens, resistance welding point not firm, characters, unstable;Long exposure time, can cause development is endless and line thinner quality accidents.Special advice, therefore, the accurate exposure time is derived from the practice of science must be used before in the production of exposure exposure ruler set the exposure time, and then fixed exposure time, don't do things according to experience, blind operation.
The mental development
Remove the screen from the exposure machine, remove the film, with gentle pressure cold water first (20-30 ℃ temperature water) wet silk screen on both sides, humid about 30 to 60 seconds, then rinse thoroughly with water cannon, until the image is displayed, then all round with absorbent cloth blot excess water, then put screen in 30 to 40 ℃ baking in the oven.
Does check to use
Screen after drying, the screen made by check again carefully whether to conform to the requirements of the production and processing, if mark immediately to do a good job of censorship, to make the production personnel to use;If you have any unsatisfactory, be repaired or reworked immediately.
Second, advance direct film sensitizing type
This film is a photosensitive material, in the process of the sensitization to stick on the screen in front of the screen exposure, is hydrophilic, solution like power, line Octavia degree good, strong and durable, its performance is superior to the sensitive glue, because of its hydrophilic, commonly known as "water film".Its operating process is:
Net processing and optional network to stick film, drying to exposure and development, set aside
Its work environment is temperature 18 to 23 ℃, relative humidity is 55-65%, yellow light, or soft light operation.
Water film in the operating process, silk screen processing before and choose network, drying, exposure and development process is the same as the sensitive glue production operation process, such as film process is different, just here, we will discuss this process concentrates on process:
Does stick film
Will screen tilted 45 ℃ in the gluing on the shelf, the screen with watering can spray wet, and then the screen with scraper water evenly, no blisters to exist;Fe reunite the water volume, make the powder, and then carefully put powder on the silk screen printing surface (convex), after put good use watering can to ink surface (concave) water, wet water film powder completely, can't see the white, reoccupy scraper evenly gently in the printing surface (convex) to water pressure, reoccupy scraper to ink surface (concave) put the squeeze out excess water gently scrape, finally the net with dust cloth box of excess moisture blot, at this point, lamination process is complete.
Stick film quality, it is the request screen must be clean and not garbage, Hang point;Second, water control, there can be no blisters, sticker pieces must be evenly not wrinkle phenomenon;
Water film in the production process must pay attention to: the paster wants even, film version must be dry, before exposure to film on the protection of the base film torn off