Second, the process of 820 series photosensitive ink, the type is different, the use of different processes, but the early process steps are basically the same. Including the following processes: Original design or topic selection - Separation, film preparation - Substrate cleaning and surface treatment - Photosensitive ink coating - Hot air pre-drying - Cooling to room temperature - Plus film exposure (high pressure mercury lamp, iodine lamp , black light, metal halogen) - development - drying ...

1. Tricolor photosensitive ink reproduction artwork process The following is the production process of color copper engraving:
Original manuscript design or selection of a color separation, film production (color manuscript copy is not copied in color, but the color of the manuscript computer color separation, divided into multiple monochrome slices for reproduction, the ideal color separation It divides the manuscript into yellow, magenta, and cyan, plus a black version, commonly known as the four-color negative film, which uses a negative film. In addition, the original is divided into five colors and six colors. Edition, eight-color version, etc.) - Substrate cleaning and surface treatment - Photosensitive ink coating such as full screen printing (full screen printing on white background, -200-300 mesh screen size. LPN-820W, SR -302W, UV-MI-20W) - Hot air pre-drying (75-85°C, 30-60 min, SR-302W130-150°C/20 min, UV-MI-20W UV curing) - Cooling to room temperature (baking The version should be cooled in the dark to room temperature before exposure, otherwise there will be a sticky film phenomenon.To prevent sticky film, especially in the summer, after a long time exposure, the photoreceptor temperature is higher, you can apply a small amount of talc in the film Powder.) Plus a film, exposure (light source can be used high-pressure mercury lamp, iodine lamp, black light, metal halogen lamp, light source is different, feel The time is different, in which the high-pressure mercury lamp has a short photosensitive time for 820 photosensitive inks.) A 1% sodium carbonate aqueous solution is developed, jet development, spray pressure 2-3 kg/cm2, 20-30°C, development 30-120s-drying (The developed photo-cured film should be dried with hot air as soon as possible, or dried at 90-110°C for 5-10 min to improve the fastness of the photo-sensitive film to the substrate. Direct UV curing can also be used to increase the hardness of the cured film. Solvent resistance, if the process is unsuccessful, the surface photosensitive film can also be washed away without damaging the underlying cured film and reducing the loss.) A photosensitive ink coating -2, drying, cooling, sensitization, development, Wash and dry.

The first color is usually black (LPR-820BK250) screen mesh 300-420 mesh.
The second color is usually blue (cyan) (LPR-820BL7072).
The third color is usually magenta (LPR-620R236).
The fourth color is usually yellow (LPR-820Y208).
Glossy or imitation oil painting (SR-305 or UV-MI-20N).
Regarding the printing color sequence, there are no fixed procedures to follow, the subject matter is different, the screen is different, the printing color sequence is different, and the effect is not the same.

2. Colored sand ink (830) Application process Substrate cleaning, drying

A screen printing liquid photosensitive resist plating resist ink LPR-800 (200-300 mesh), the level of screen mesh used depends on the etching depth, the deeper the corrosion, the lower the mesh number, otherwise the higher

- Pre-drying (75-8°C, 15-50 min)
-Exposure (such as lkw high-pressure lamp, lamp 50cm exposure 30-60s)
- Development (1% Na2, CO3, 20-30°C, 10-60s)
-Washing - Drying (100~l20°C, 10-15 min)
- Etching (Electro-etching or Chemical-Corrosion) If it is a titanium plate, first remove the titanium film to get ink (3%-5% NaOH) to obtain a positive character. Etching the metal plate. Full version Screen printing LPR-830 ​​color sand Ink (100-200 mesh)
- Pre-drying (75-85°C, 15-50 min)
-Exposure (1kW high-pressure mercury lamp, lamp foot giant 50CE exposed for 1-2 min) Because the photosensitive film is thicker and contains colored sand grains, the ultraviolet rays are not easily penetrated, so the required photosensitive time is longer than that of the LPR-800 series ink-developing (1 %Na2,CO3,20-30°C,10-60s)
-Washing - hot air drying (100-120°C. 15-20 min.) Signs with a light or matte gold background effect - UV cover (Screen printing UV varnish, 200-300 mesh) or thermosetting varnish (SR-305N), High-glossy sand signage - UV curing (1kW high-pressure mercury lamp, lamp distance 10-15CE, 10-20s) or heat curing 130-150°C/20-30 min.

(3) Application Process Flow of Spot Color Ink and Sunlight Series Photosensitive Inks Using 820 series photosensitive inks not only can be used as a substitute for liquid photo resist inks to produce precision metal signs, but also can be permanently retained on the substrate, or instead of manually Filling paint or electrophoretic paint filling process.

Substrate cleaning and processing - Ink E LRP-820 (100-420 mesh) or LPR-800 series ink - Pre-drying (75-85°C, 30-50 min)
- Exposure (such as lkW high-pressure mercury lamp, lamp distance 50cm, exposure 30-60s)
- Development (1% Na2, CO3, 20-30°C, 30-120s)
- Washing - Drying (100-120°C, 10-15min)

If the pattern needs to be retained permanently, the drying temperature can be increased, such as 120°C/20-30min. Drying improves the adhesion, hardness, and acid and alkali resistance of the ink to the substrate. If you add 820 curing agent to 820 series photosensitive inks, the ratio is 10:2, mixed before printing, and the resulting cured film hardness can reach 5-6H.

- Chemical etching or etching - Removing film (3%-5% caustic solution)
- Drying (90-100°C, 5-10min)
Photosensitive coloring - full version of screen printing 820 spot color photosensitive ink (100-200 mesh)
- Pre-drying (75-80°C, 30-50 min)
- Positive film exposure (such as lkw high-pressure mercury lamp, lamp distance 50cm, exposure 30-60s)
- Development (1% Na2, CO3, 20-30°C, 30-120s)
-Washing - Drying (120°C, 20-30 min) gives a two- or multi-coloured precision label.
A cover (anti-UV, anti-acid, anti-scratch).