10 screen printing experience
1. In the production of fine screen version, why the use of yellow screen than white screen exposure time to be increased?
Because the white screen refraction and reflection in the screen printing material is white light, the spectrum can be approximated to photosensitive material, while the yellow screen refraction, the reflection of the spectrum is close to the security of light-sensitive materials, the role of light-sensitive materials , So with its production of screen, the exposure time should be appropriately increased (1/2 to 1/3 or so), to avoid underexposure and reduce the light-sensitive materials and screen bonding fastness.
2 multicolor overprinting a few pieces of screen Why screen lines (by, latitude) cutting direction, tension and other requirements to be consistent?
As in the textile screen, the warp and weft yarns are subject to different pulling force, when several screens are respectively warp or weft-based production, the left multi-color overprint, you can not fall in the correct color area , From Lai produce stack (color) and empty color and other defects. , Keep the screen lines, cutting direction, stretching the consistency of tension, uh, to ensure that the overprinting position is accurate, does not produce misplaced.
3. Screen in the use of the process of why the extension, variant?
The main reason for the screen elongation is that the tension of the screen is not up to the rated requirements so that it can not withstand the pressure of the squeegeeing.According to the material factors, the reason for the screen modification should also pay attention to the time effect, that is, After a release of the force process, in order to maintain the stability of the screen tension. Generally should be stretched screen placed more than 24 hours to produce graphics.
4. After the exposure of photosensitive adhesive crosslinking, bridging, solid content definition and role?
The photosensitive resin from the linear structure into the network structure of the process is called the resin cross-linked, so that the formation of lipid molecules or derived from insoluble solvent in the structure of the phenomenon, known as resin bridging. High-quality photosensitive adhesive is made of photosensitive resin with good bridging properties, which can improve the wear resistance of the screen plate and improve the screen pattern accuracy. The solid content refers to the amount of residual resin after the water in the photoresist is completely volatilized, as a percentage of the photoresist. Containing high solid light Jiao, a higher concentration, made of screen graphics crisp, full, on the screen accuracy can also play a role in improving.
5. Screen exposure time and what factors?
Screen exposure time and the glue layer thickness, image detail, photographic backplane contrast, screen performance, the exposure of the voltage level, power and temperature changes and other factors, in general, sensitive adhesive thick, low temperature exposure The time is relatively long, the image is fine, the light source is new, the negative of the film is big, the exposure time can be shortened appropriately.
6. When the exposure time is appropriate, the screen after the development of light-sensitive adhesive and screen is not firmly linked to what is the reason?
The main reason is the screen pre-treatment is not good, grinding net degreasing is not enough. Polyester mesh must be grinded with an abrasive paste to roughen the surface so as to increase the bonding area with the photosensitive material. The degreasing of the screen necessitates that the screen be fully hydrophilic and, in addition, incomplete drying after application of the photo-sensitive adhesive (film) will also cause the release of the photo-sensitive material after development.
7. How to print the thickness of 0.05 ~ 0.1 mm thick lines?
Generally consider from three aspects: a. Should use coarse mesh, such as 43T or 54T screen; b. Should be used with good bridging performance, solid content (Plus-8000) sensitive adhesive and thick hair Such as: mixed plate method; c. Should be used with a certain viscosity of the ink, so that the high blot without collapse.
Reference plate technology:
First: go to the screen according to the conventional method of scraping light Jiao, scraping five layers, each layer should be dried at 45 ℃, and then foil (paste capillaries 80), completely dry and then peeled off transparent base, and then 40 ~ 45 ℃ back to more than 30 minutes, and then exposure, development, drying, sealing can be.
Second: The first capillary 80 affixed to the screen printing surface, and then squeegee photosensitive ink scratch twice, at 40 ~ 45 ℃ under the drying, peeled off the film base. Then wipe five layers of photosensitive glue on the capillary film, each time at 40 ~ 45 ℃ for drying, and then exposure, development, drying, sealing can be.
Requires ink viscosity control at about 300PaS, in the screen printing machine can print thick thick 0.05 ~ 0.12 mm lines
8. How to adjust the screen printing ink viscosity?
Before using the ink stick to fully stir the ink is generally believed that the ink stick from the ink in the ink about 25 centimeters, the ink from the ink stick on the continuous flow down, can be considered appropriate viscosity. If the ink drops downwards and downwards from the ink stick, it shows that the viscosity is high and the diluent needs to be adjusted.
9. screen printing ink toning what is the point?
Should be provided by the manufacturer's standard color card deployment, the best in the direct sunlight without deployment. Grading steps should be gradually deepened from the shallow start, so that gradually close to the standard color card. When allocating color difference, it is necessary to consider the influence of substrate type and background color, the difference between dry ink and wet ink, and the influence of imprinted thickness on color development. As far as possible, the types of color inks to be used are minimized, the primary colors are adjusted as far as possible, Bright, not gray.
10 UV ink screen printing color how to arrange?
UV ink is ink by UV absorption and curing, the various colors of ink required curing time varies. As the magenta light transmittance of 50 to 60%, 20 to 30% yellow, 8 to 20% cyan, black is about 12%, according to the color of the 180-420nm UV absorption of the other, usually UV ink screen printing The order is black-cyan-yellow-poinsettia, which does not affect the UV cure rate.
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