Polyurethane doctor blade
Because the offset printing ink cannot be compatible with the PVC film, the letterpress printing plate is swollen and corroded by the PVC ink, so usually only two methods of gravure printing and screen printing can be used for printing. The printed PVC film will soften and deform at 60~70°C, and the printing will not be on the printing plate, let alone the overprinting accuracy. Therefore, the drying temperature of the drying box during printing cannot be higher than 60°C, and the printing is generally dried. The temperature is preferably 20~30 °C. If you use the gravure printing machine of the direct heating type drying box, the heating of the drying box can not be opened, and the light can be blown off. This article will introduce you to the polyurethane squeegee.
Such periodic fluctuations not only have a certain influence on the plate roller base, but also the effect on the doctor blade is very obvious. The long time vibration will make the doctor blade scrape dirty, resulting in dirty version. A phenomenon occurs. By increasing the pressure on the doctor blade pressure, the problem can be solved in a short period of time, but the problem cannot be solved fundamentally, and it also has a significant impact on the service life of the doctor blade.
The polishing quality of the surface of the plate roller is mainly manifested by the number of burrs around the cell. The good quality plate has a clean, no burr, and the cells are clear and there are no impurities inside. This ensures that the plate roller does not damage the doctor blade during the printing process. After the squeegee is frequently replaced, if there is still a ruled line on the printed product, it can be generally determined that there is a problem of polishing quality of the plate roll.
The principle of the printing ink for plastic film is what performance of the plastic film with the performance of the plastic ink, that is, the ink connecting material and the printed PVC film have the same performance, will have affinity, will be well combined. The PVC film swells and dissolves in a solvent of a fat, a ketone, an aromatic hydrocarbon, and a halogenated hydrocarbon, so that a composite ink containing an oxidized polypropylene containing a large amount of a fat and a ketone cannot be used. When using a surface-printing ink of polyamide, it is necessary to prevent the precipitation of the softening agent in the PVC film, and the ink is anti-adhesive, and film adhesion occurs. In addition, the use of PVC special ink, also pay attention to the amount of ink can not be too large, otherwise the PVC film will be swollen and melted by the cyclohexanone solvent in the ink, resulting in roughening or wrinkling of the film surface.
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