Silk screen printing process and technical knowledge related to metal screen printing
Silk screen printing as a kind of application range is very wide, depending on the substrates can be divided into: fabric printing, plastic printing, printing, metal ceramic printing, glass printing, printing of electronic products, lottery printing, electricity ACTS the role of screen printing, advertising board metal screen printing, advertising board stainless steel screen printing, light reflector screen printing, silk screen printing electrochemical aluminum, silk screen print and lacquer screen printing and so on.

Metal screen printing

       Metal screen printing range is very wide, can print all kinds of signs, panels, signs and metal forming products, etc.They mostly decorated with direct printing, no much difference in screen printing techniques, just metal products are durable, surface decorative requirements higher, more durable, so before printing surface processing, such as surface coating, electroplating, anode oxidation and mechanical play MAO (brigade grain, drawing), etc.Printing, to ensure that the surface is clean, so be sure to wear gloves when working.If treated on the surface of product such as grease, fingerprints and dust stains, must use solvents such as trichloroethylene, diluents and petrol for.In addition, according to the surface of the metal to choose the appropriate printing ink performance, such as amino paint and epoxy coating on the surface of the lacquer that bake, amino and epoxy resin with thermosetting ink;Nitrocellulose lacquer and other natural drying coating, can use type solvent evaporation or oxidation drying inks, but must be careful with solvent or diluent, in order to prevent the destruction of paint, and after printing cover coating a layer of light oil, in order to improve the luster and protection of the surface;Metal plating surface can also be used thermosetting ink printing, but must pay attention to the electric plating and the difference in thermal expansion coefficient of metal, to control the heating temperature, avoid coating cracking resulted from the difference expansion coefficient;The anodic oxidation of aluminum plate can form a space uniform layer of oxide layer (about 2 ~ 10 microns thick), has a larger surface area, can improve the adhesion of the coating (ink), in addition, there is the performance of the adsorption of dye diffusion type ink or disseminated legal system for dyeing.

        1. Corrosion sign is a traditional sign, species are used as the instrument panel fill paint panels, sandblasting oxidation number used for vehicle license plate, equipments and various machine tool electrical corrosion baking enamel signs nameplate, of mechanical and electronic products used in industrial environment is poor, copper plating front panels, as instruments, electronic instrument surface decorative porcelain paint signs, oxide and glossy plates, etc.These signs on the graphic in the past are all from liquid photosensitive glue (fibrin glue, bone glue, gelatin, pva glue, etc.) by photochemical method now.The advantages of this method by deformation of the small, but the existing production process more production efficiency is low, many defects such as the intensity of labor and energy consumption.By adopting the method of silk screen printing graphic, several times can improve the production efficiency, save a large amount of auxiliary materials and energy.For readers under the concrete corrosion sign by screen printing technology.

         2.Screen printing aluminum oxidation dyeing brands aluminum oxide plate, the surface smooth, hard wear-resisting durable.Aluminum oxide signs, panels after oxidation closed surface has a layer of oxide film, the surface is hard and smooth.With general screen printing ink adhesion is poor, often should pay special attention on this point.To solve this problem, must first solution loss of screen printing ink and operational problems.Using alumina screen printing ink, is the solution of alumina in the printing ink film adhesion, strong degree such as the key to the problem.The ink is different from general ink, it will firmly adhere to the aluminum plate, and also has good light fastness, is an ideal printing ink to printing aluminum anodic oxidation plates.
3.The characteristics of the printing and color aluminum plates convex concave plates is painted in sunken place, good abrasion resistance, it also has the stereoscopic effect, more used by mechanical plaque and plaque, etc.Traditional method is to use artificial in corrosion of the sunken place painted (or with needles note paint), next reoccupy hand finish, remove residual paint edges.This method not only time-consuming, low efficiency, require the operator to have skilled techniques, and make signs often faces words is not clear, the handwriting deformation, the quality is not stable.Therefore, only to make some small batch, less chromatic number, quality is not high, the design is very simple.

        4.Silk screen embedded sandblasting oxidation coating aluminum label printing embedded sandblasting oxidation paint label process, is a traditional sign making craft.This kind of product appearance is silvery white, high surface hardness, good wear resistance.

         5.Screen printing wood from alumina plates water white alumina plates is recently in our country in a new type of the photon surface sign.This sign a milky appearance, smooth surface smooth, no AoTuGan, wet and heat resistance, salt fog resistance, mildew resistance, but also has the very strong fast, friction resistance, solvent resistance and other properties, applicable to need often wipe machine and the machine work under the condition of the environment is bad.More valuable is silk screen white water signs of alumina production process, high efficiency, less basic no "three wastes", its human, energy (including water, electricity) consumption of no more than a third of the traditional corrosion sign.

       6.The printing aluminum oxide color plates of aluminum surface anodic oxidation plates is one of the signs varieties, which has been widely applied.It has a beautiful, bright, high hardness, good wear resistance, etc.Under the previous process for aluminum materials, mechanical polishing, chemical polishing, oxidation;Indirect silk screen version of the legal system, zinc barium Bai Hou paint alkyd varnish to protect printing;With dye printing ink staining.This process whether or dyed silk version, there are materials, complex process and low printing endurance, poor resolution, the shortcomings of high cost.Under the condition of existing technology, developed a set of working procedure is relatively simple, good quality, high efficiency of the new process is possible.New process with non-toxic type diazo photosensitive glue directly legal screen plate, proved to plate making fast, high resolution, high printing endurance, less material requirements.And protection paint, dyeing, printing can be printed material process combined into one, namely the self-made aqueous dye printing, direct dyeing, successive matching color, without color cylinder.Thus greatly simplifies the whole process and procedure, make the surface oxidation dyeing sign with the new method.

       7. Glossy 3-dimension embossing aluminum plates with the continuous development of production technology, people's material and spiritual improvement of living standards, people not only to the functional requirement of the products is higher and higher, and the product modelling, also put forward higher request.Especially with the development of market economy at home and abroad, the expansion of the foreign trade, the product features and quality requirements also more and more apparent.In order to improve the product market competition ability, the high grade product of glossy 3-dimension embossing plates have been widely used.

        8.Screen printing electroplating plaque plaque is one of the many signs factory production products.Plaque mainly metal materials, it requires solemnly, obviously, adornment sex is strong.In traditional metal plaque, especially for brass, corrosion word, note black paint plaque is most common.Constantly changing as people aesthetic point of view, the gradual development of commodity economy, also about the quality of the plaques have new different requirements.Screen printing technology is introduced because of the sign industry, not only promoted the development of printing technology, but also to sign industry provides a technology to develop new products.Screen printing new type electroplating plaque is the sign of legal system electroplating, the combination of the screen printing process.Its basic method is clear graphics, legal system on the copper plate with screen printing ink layer of protection cover without graphics, the graphics silver tree parts of the system of copper, nickel, chromium plating, again for plastic machinery, and protection.

         9.Imitation metal etching screen printing imitation metal etching and printing products, metal etching effect on the vision.To achieve the above effect, the surface of substrates should be have a bright luster.On substrates with transparent ink printing ink into a concave and convex coated, frosted glass of rough surface, have a sharp contrast between the rough surface of combination, make the printing like concave shape, the mirror is produced on the convex printing effect.The stronger the contrast, etching effect is better.The effect of concave and convex and ink film coating thickness is proportional to the.Its high ink containing solids, if using low mesh plate, the effect will be better.This technique is used originally acrylic emulsion (50% solids) of gel ink, in its 180 ℃ after the dry heat treatment.So substrates is limited to heat the metal and glass, etc., can't use hard plastic and paper.Because of the use of acrylic emulsion and other high viscosity gel ink, and the temperature in the operation, ink viscosity stability is poor, the quality of the product fluctuates greatly.Since used in screen printing uv drying inks, printing process, the technique has a lot of flexibility.Uv ink is 100% type, ultraviolet light ink can be hardened 3 ~ 5 seconds, during which the surface temperature of about 100 ℃ or so.If you use water cooled UV irradiation, the temperature can drop to around 60 ℃, which will also increase, the kinds of substrates can be in aluminum foil with bright luster, vinyl chloride film evaporation paper, vapor deposition, deposition printed materials such as polyester film.

       10.Screen printing conical dial screen printing method of conical dial: graphic screen printing on the transfer printing rubber first, and then the conical parts loaded on the special fixture self-made, and out of the heat transfer rubber roll, thus graphic transfer into the conical parts.

       11.Tile-like oxidation brands imitation porcelain anodic oxidation plate are porcelain glaze surface, soft luster, has the very good resistance to resistance, high hardness and wear resistance, good insulation resistance and electrical insulation, good covering ability and ideal adsorption ability, is the best of instrument especially the adornment of the high-grade machine.But in the process of production of chromium gas escape, therefore the operation device should be equipped with good ventilation and ventilation equipment, in order to avoid poisoning.Imitation porcelain surface pretreatment methods of oxide signs and silk screen embedded sandblasting oxidation paint panels are basically the same, just the imitation porcelain oxidation corrosion signs generally do not need a chemical polishing, and direct oxidation.Fangci oxidation corrosion signs, imitation porcelain oxidation dyeing brands and imitation porcelain printing plate punching processing generally before oxidation.Fangci oxidation corrosion sign after oxidation process with embedded sandblasting oxidation paint process is the same, tile-like oxidation dyeing label technology and screen printing aluminum oxide color label.