Future screen printing material market development trend

China's screen Printing Materials such as silk screens, sensitized adhesives, and inks have made great progress, but there are still some gaps compared with screen printing materials produced by foreign advanced manufacturers, such as high-strength, low-elongation high-mesh filaments. Net; high-sensitivity non-diazo-sensitive plastic; UV inks, water-based inks.

First, the screen

At present, China's annual import volume of screens has reached more than 1 million m. The imported products are mainly 270-mesh polyester screens and nylon screens. High-density high-density wire mesh screens, high-strength low-stretch screens, anti-static screens, calendering, and other special screens and polyester high-end screens are all required to be imported.

Domestic polyester meshes and nylon meshes have a good market, and polyester meshes have a small amount of exports. However, domestic mesh types and specifications are too few, and high-quality, high-mesh, wide-width meshes are yet to be developed.

A new kind of non-woven wire mesh has been developed abroad, which overcomes the trouble of applying photo-sensitive tape at the intersection of the traditional wire and weft lines. Modern high-quality ultra-fine graphic screen printing, subtle screen printing, high-precision positioning screen printing, special ink quantitative screen printing and large-scale color tone screen printing, all put forward higher requirements for the use of screens: such as high strength , low elongation variability, repeatability, consistency, long service life, etc.; such as printed electronic micro components, integrated circuits, multilayer printed circuits, fluorescent digital displays, aerospace instrument flat panel displays and other high-tech products; such as when Some screen printing requires anti-static, metallized, physical, chemical or special material screens.

Recently, the precision of printed circuit boards and electronic components has become apparent, and the accuracy of dimensional positions is demanding. In addition to polyester, polyamide, and stainless steel, silk screens were made of high-resistance polyester yarn cores and polyamide cores. It is made of polypropylene ester fiber with mesh mesh of 330 mesh, longitude of 23μm and interweaving of 36μm. It can achieve high tension and is truly an epoch-making screen. Moreover, in order to meet the requirements for precision, these screens have been subjected to various treatments such as plasma treatment, metal deposition, and polishing.

Second, photosensitive adhesive

China's screen printing has made great progress in the development of photosensitive adhesives, and diazo-type photosensitive adhesives have been able to meet the needs. The long-established hand-engraving method 1 describes the plate-making method, and the dichromate type plate-making method is basically replaced by a resolution-enhanced diazo photosensitive (or diazonium salt) plate making method. The water-resistant and solvent-resistant diazo photosensitive adhesives produced in China are close to the advanced level in use and can meet the requirements for general-precision template production.

1. Dichromate photosensitive adhesive

Dichromate + OVA (early protein). Due to the dark reaction, the shelf life is shortened, and due to the presence of heavy metal pollution problems, it has been restricted.

2. Diazo photosensitive adhesive

1 diazo resin + PVA + polymer emulsion. According to the mixing ratio of PVA and polymer emulsion, it has solvent resistance and water resistance. Double absorption peak near 375nm, so the use of metal halide or ultra-high pressure mercury lamp is more appropriate. This type of photosensitive liquid is less odor and skin irritant, and it is easy to modulate. It is also easy to release and regenerate. It is cheaper.

2 diazo resin + PVA + polymer emulsion + acrylate monomer. An acrylate monomer dissolved in a photopolymerization initiator is added to a diazo resin, a PVA, and a polymer emulsion, and hardened simultaneously according to a cross-linking reaction of a diazo resin and an acryloyl polymerization reaction. Due to the increased polymerized cross-linking of acrylates, water resistance and solvent resistance are improved, so that high resolution and edge definition are also improved.

3. Non-diazoresin

1SBQ. PVA + polymer emulsion SBQ. PVA is an abbreviation of PVA added with a styrene pyridinium salt. SBQ is a phenylpyridinium salt, not only high sensitivity, but also good water resistance. Crosslinked PVA, insoluble in water. This compound has a high sensitivity and has excellent storage stability in the state of applying a photosensitive liquid.

2SBQ. PVA+ Polymer Emulsion+ Acrylate Because SBQ is used as cross-linking agent, high sensitivity is achieved, and thick-film version (300-400 μm) is also easy to make. In the current screen printing sensitizers, water-based and solvent-based inks can be used, and high-sensitivity plates can be produced, referring to such sensitizers.

It is predicted that in the 21st century, SBQ photosensitive adhesives will replace diazo type photosensitive adhesives and become the most used photosensitive adhesives. SBQ is a single-liquid type photoresist, so no photosensitizer is needed; it can be used immediately, saving time and not wasting. The sensitivity is 3-5 times higher than that of diazo photosensitive adhesive and the exposure time is about 1/5 of diazo. It can save energy, reduce costs and improve work efficiency. High resolution, superior original reproduction performance and developing performance. Thin lines can be ultra-precision printing. High concentration, good coating performance, smooth film surface, clear plate lines, and can make thick film screen. The stability of storage is excellent, and it can be stored in high temperature and humid climate for at least 3 years without any influence on plate making. Therefore, it is possible to produce a PS plate (pre-coated plate) or a film for long-term storage.

In the past, color overlay in screen printing, the image accuracy can only reach 40-100l, as seen in the CD (DVD) disk printing, audio and video images and electronic game products, the demand for more vivid printing dramatically. For this reason, the image should reach 80-133l or more. The photosensitive adhesive is a non-diazophobic adhesive, which is the direction of future development.

Third, screen printing ink development trend

China's production of screen printing inks is relatively complete, both solvent-based inks suitable for a variety of substrates, but also the newly developed water-based inks and UV inks, some of the quality is very good, it should be said that rapid development. However, due to the wide variety of screen printing substrates such as metals, plastics, ceramics, glass, sheets, leather, fabrics, and the like, either flat or profiled screen printing requires a large amount of screen printing inks that are compatible with the substrates.

At present, China's high-quality, high-precision printing inks and special-purpose inks, four-color screening inks and UV inks are almost imported. Therefore, there are infinitely bright prospects for the application and development of screen printing inks. For this purpose, screen printing ink companies should develop inks with corresponding fineness, fluidity, viscosity and other characteristics for different substrates and process requirements for printing materials and different industries. This is to improve the quality of screen printing products and broaden them. The important way of screen printing industry. In particular, China's water-based ink UV ink future is immeasurable and needs to be vigorously developed.