The concept of pad printing machine printing plate and process characteristics
Pad printing steel version in the dominance of pad printing process, 100% of the oil disc pad printing machine and 16% of the oil cup pad printing machine using thickness around 15 mm thick steel plate;Another 77% oil cup type moving printing machine using thickness in 0.25 mm and 0.5 mm steel sheet, steel sheet or plate, plate making process is the same.Use the base material is also roughly the same.Steel plate must have a delicate structure, surface finish to be high enough.Guarantee after corrosion on the edge of the graphic in the former, and to ensure the integrity of network structure, make the printing graphic trimming sharpness and color reduction to get maximum implementation;The latter guarantee scraping clean degree and the rate of resistance to print.Oil cup pad printing machine use of thick plate on the surface of the degree of tolerance is more demanding, the surface of the degree of tolerance is too large on the one hand, speed up the process of wear oil cup, on the other hand also relationship with the seal of the ink, used in oil disc pad printing on the plate if you want to use in the oil cup machine to ensure that a higher surface smoothness and a lower flatness tolerance.
Sheet steel has better flexibility, so easy to guarantee scraping clean degree, but with the support substrate manufacturing precision of the thin plate, the surface of the substrate degrees of tolerance, blatantly ink will leak in the process of oil cup and plate sliding.Another factor is the manufacturing precision of oil cup sliding guide shaft, such as surface roughness and tolerance, embodied in the whole machine assembly level indicators, guide shaft and steel plate between the parallelism tolerance how to control becomes very important.From this perspective, thick steel plate oil cup pad printing machine manufacturing difficulty is greater.
The resin version
Resin version of the application to the pad printing process on time is not long, but has been ignored.Resin version with nylon photosensitive glue is given priority to, cast in zinc plate surface, similar to the resin version of stickers trademark used above.Nylon has the very good wear resistance, photosensitive after curing can be an asset to the oil cup or scraper friction over and over again.Use resin version first is easy to obtain the advantages of extremely fine outlets, printed in elegant small items, the resin version is preferred.If manufacturing oil cup pad printing machine embodies the manufacture level of an enterprise, then make use resin version of pad printing machine will be more difficult, nylon photosensitive glue after all belong to the high polymer material, when support its substrate manufacturing precision, pad printing machine to complete the general printing is not easy.High polymer material surface state is very careful, slight defect will seriously affect the printing quality.
Plate making process
The pad printing plate to use add protective nitric acid solution and ferric chloride solution for corrosion.The corrosion of acid is very smelly, generate nitric oxide and nitrogen dioxide does great harm to the human body, steel corrosion after enhancement is based on hydrogen peroxide as the main body of chemical solvents, also have certain harm to the person's skin.So the state has already banned in Europe.They began to use resin version or process with laser engraving.Corrosion zinco no powder corrosion machine reference to corrosion of the steel plate should be more novel ideas, some manufacturers have been successfully trial-produced, this method greatly reduces the pollution of the environment.Resin version of the plate are more environmental protection, and security.Use nylon photosensitive adhesive resin version, can use asperse essence to development.As the digital fashion, using digital way to make the pad printing resin version of the time will not wait too long.
ink
Pad printing ink is still given priority to with solvent ink, pad printing ink has been replaced with screen printing ink, the effect also is very good, at present most of the ink manufacturers the pad printing ink and screen printing ink as a series of production.But net edition printing ink used in pad printing process above also can appear a lot of problems.MARABU company takes the lead in developing the pad printing ink, in contrast, a dedicated pad printing ink dry faster and more stable, thixotropy is better.Pad printing process of the ink layer is thin, want to get a striking handwriting, ink pigment of higher purity, fineness finer, these are the manufacturing difficulties of the pad printing ink.At present, the pad printing inks besides MARABU company has special series, pad printing ink of the German DUJO company also began to occupy a certain market.In addition, a dedicated pad printing ink very few, to the production of screen printing ink for English COATES ink as a substitute for low-standard products also have a big market share.The pad printing ink market, lucrative, attracted many domestic enterprises research and development, domestic printing ink production have been very rapid development, prominent have good ink co., LTD., hangzhou branch in zhongshan looked ink printing ink co., LTD., shenzhen beautiful China co., LTD.