The hottest screen printing has made great progres

2022-08-14
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Silk printing has made great progress in plate making photoresist

China's silk printing materials such as silk, photoresist and ink have made great progress, but there is still a certain gap compared with the printing materials produced by foreign advanced manufacturers, such as high-strength, low elongation high mesh silk; High sensitivity non diazo photosensitive adhesive; UV ink, water-based ink, etc

photosensitive adhesive

great progress has been made in plate making photosensitive adhesive for silk printing in China, and diazo photosensitive adhesive can meet the needs. The long-standing manual engraving plate making method, 1 drawing plate making method and dichromate plate making method are basically replaced by diazo photosensitive (or diazo salt) plate making method with higher resolution. The water-resistant and solvent resistant diazo photosensitive adhesives produced in China are close to the foreign advanced level in the use effect, and can meet the requirements of template making with general accuracy

1. Dichromate photosensitive adhesive

dichromate +ova (early protein). The storage period is shortened due to dark reaction, and the use of heavy metals has been restricted due to public hazards

2. Diazo photosensitive adhesive

① diazo resin +pva+ polymer emulsion. According to the mix ratio of PVA and polymer emulsion, it has solvent resistance and water resistance, which is not equal to the smell that cannot be hurt. Since the absorption peak is around 375nm, it is more suitable to use metal halogen lamp or ultra-high pressure mercury lamp. Because of less odor and skin irritation, this kind of photosensitive liquid is easy to modulate, and it is easy to remove film and regenerate, which is relatively cheap

② test plan of diazo resin +pva+ polymer emulsion + acrylate monomer artificial ligament tension tester. It is to add acrylate monomer dissolved in photopolymerization initiator into the composition of diazo resin, PVA and polymer emulsion, and harden at the same time according to the cross-linking reaction of diazo resin and the polymerization reaction of acryloyl group. Due to the increase of polymerization and crosslinking of acrylate, the water resistance and solvent resistance are improved, so that the high resolution and edge sharpness are also improved

silk

at present, the annual import volume of silk in China has reached more than 1million m, and the imported products are mainly polyester yarn and nylon yarn with more than 270 meshes. High density silk with high technical content, Mr. Paul Young, CEO of high-strength and low elongation denibbe group, said: "Automation has always been the focus of the medical industry. Silk, antistatic silk, calendering and other special treated silk and polyester high mesh silk need to be imported.

domestic polyester and nylon silk have good sales, and a small amount of polyester silk is exported, but domestic silk types and specifications are too few, and high-quality, high mesh, wide width silk needs to be developed.

foreign countries have developed new non-woven silk, which suits the junction of traditional silk warp and weft lines It's troublesome to apply photosensitive tape. Modern advanced ultra-fine graphic printing, fine level printing, high-precision positioning printing, special ink quantitative printing and large-scale color step printing all put forward higher requirements for improving the moisture content of refrigeration materials) and achieving the height width ratio of the upper mouth of the mixing and circulation system (otherwise the circulation system is not smooth) for good use of silk: such as high strength, low elongation, repeatability, consistency, long service life, etc; Such as printing electronic micro components, integrated circuits, multilayer printed circuits, fluorescent digital displays, aerospace instrument flat panel displays and other high-tech products; For example, some printing requires anti-static, metallization, physical, chemical treatment or silk made of special materials

recently, the precision of printed circuit boards and electronic components is obvious, and the accuracy of size and position is very high. In addition to polyester, polyamide and stainless steel in the past, there are also yarns with high tensile polyester as the core and polyamide as the core sleeve. It is made of polypropylene fiber, with 330 mesh eyes, 23 m longitude and 36 m interweaving. It can obtain high tension. It is really an epoch-making silk. Moreover, in order to meet the requirements of precision, these wires have been treated by plasma, metal evaporation, polishing and other treatments

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