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How to do metal screen printing?

Polyester bolting cloth are used in a wide range of metal screen printing, and can be used to print all kinds of marking roots, panels, signs and metal molded products. Most of them are decorated with direct printing. There is no big difference in silk screen printing skills. Only metal products are durable goods, and the surface decoration requirements are higher and more durable. Therefore, surface treatment is often performed before printing, such as surface coating, electroplating, and anode. Oxidation or mechanical hairing (bringing, drawing). When printing, make sure that the surface is clean, so always wear gloves when working. If the treated surface is covered with grease, fingerprints and dust, it must be washed off with solvents such as trichloroethylene, thinner and gasoline. In addition, according to the surface properties of the metal, suitable printing inks, such as amino baking varnish and epoxy baking varnish coating surface, should be made of amino and epoxy thermosetting inks; natural drying coatings such as nitro varnish. Solvent-evaporable or oxidative drying inks may be used, but solvents or thinners must be used with caution to prevent damage to the paint surface, and a layer of varnish is added after printing to improve gloss and protect the entire surface; the metal plating surface is also It can be printed with thermosetting ink, but it must pay attention to the difference between the thermal expansion coefficient of the plating layer and the metal to control the heating temperature, avoiding the difference of the expansion coefficient and causing the coating to crack. The anodization of the aluminum plate will form a uniform oxide layer (thickness). 2~10μm), it has a large surface area, can improve the adhesion of the coating (ink), and also has the property of adsorbing dyes, and can make dyeing signs by diffusion type ink or dip dyeing method.

1. Silk screen convex and concave color aluminum signboard The convex and concave signboard is characterized by painting in the concave part, which has good abrasion resistance and three-dimensional effect, and is mostly used for mechanical nameplates and company plaques. The traditional method of making is to manually paint the corroded recess (or paint with a needle) and then manually trim it to remove the residual paint on the edges. This method is not only time-consuming, low-efficiency, requires the operator to have skilled skills, and the signboards are often unclear, the characters are deformed, and the quality is very unstable. Therefore, it is limited to making some signs with small batch size, low color number, low quality requirements, and very simple pattern.

2. Screen printing plating plaque plaque is a product produced by many sign factories. The plaque is mainly made of metal materials, which requires solemnity, obviousness and strong decoration. Among the traditional metal plaques, brass plaques, corroded words, and black lacquered plaques are the most common. With the constant change of people's aesthetic views and the gradual development of the commodity economy, there are new and different requirements for the quality of plaques. The introduction of silk screen technology in the signage industry has not only promoted the development of silk screen technology, but also provided technical means for the sign industry to develop new products. The new electroplating plaque of silk screen printing is the combination of sign plating and silk screen printing. The basic method is to form a plain text on the copper plate by silk screen printing, to cover the unpatterned part with the ink layer, and to form a copper, nickel, and chromium system for the silver portion of the pattern, and then mechanically shape and protect it.