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Plastic Screen Printing

Addtime：2015/7/4 16:48:45 Hits：2159

Plastic Screen Printing
Printing of plastic parts, plastic products secondary mechanic (or reprocessing) in one. The so-called secondary processing is in the plastic injection molding, to conduct a surface decorative treatment, such as: plastic plating, plastic coating, plastic stamping, plastic silk screen. Plastic products so for secondary processing, mainly determined by the performance of a plastic itself, such as its dyeing relatively simple, and the colors of light-fastness is poor. To compensate for these shortcomings, improve the appearance of the decorative plastic products, on the need for secondary processing.
Many types of plastics, but on screen printing method, a sheet and a flat body with a flat screen printing method; can be expanded into the plane of the arc body with a curved surface printing method; profiled products is an indirect printing method. Different plastics solid resins, additives and molding method, a large difference in surface properties, especially surface smoothness, polarity and electrostatic problems, be a source of failure of the plastic screen.
1. PVC screen printing, PVC (PVC) put into industrial production in 1931. PVC has a bright color, easy to break, acid and alkali, low cost advantages. However, due to the production of PVC, adding some auxiliary materials, often with toxic, so PVC products should not serve food. PVC film color variety, colorful plastic sheeting commercially available, mostly PVC artificial leather products.
2. Screen printing plastic ABS plastic ABS resin, a plastic. In recent years, widely used in televisions, calculators and other products as well as many areas of the national economy. ABS plastic is acrylonitrile, butadiene, styrene terpolymer. Since the ABS plastic is a terpolymer, so the common characteristics of both of the three-component, acrylonitrile copolymer enables chemical resistant and has a surface hardness; butadiene polymer having a rubber-like toughness to make; styrene can The polymer has the characteristics of easy processing forming. ABS plastic in various colors, with a glossy appearance products, low water absorption, in a certain temperature range with good impact strength and surface hardness, better dimensional stability. Most of ABS resin at a temperature of -40 ℃ still considerable impact strength, toughness exhibited its products in the temperature range -40 ~ 60 ℃, ABS plastic, high molecular weight, good physical properties, easy processing, printing fit better.
3. Polyethylene, polypropylene plastic screen printing polyethylene (PE) plastic: polyethylene plastic extensive use by extrusion, injection molding process into various products. Polyethylene-based molecule by a methylene group consisting of a long chain, which contains a certain amount of side groups. The more polymer side chain group longer, the lower the crystallinity of the polymer. In other words, the higher the density of the polyethylene is not conducive finishes. Polyethylene in a variety of solvents is unclear, but when the temperature exceeds 70 ℃, a small amount of polyethylene dissolved in a solvent can be toluene, amyl acetate and the like. Polyethylene of this nature provides the conditions for the surface finishing. Available heated solvent soaked plastic to the surface swell, destroying part of the crystal to improve the adhesion of the ink film on the plastic surface. Fuming sulfuric acid, a mixture of concentrated nitric acid, chromic acid and sulfuric acid at room temperature can be slow to act on polyethylene; at 90 ~ 100 ℃ sulfuric acid and nitric acid, can rapidly destroy polyethylene; with a heavy lead-acid, potassium, sulfuric acid, distilled water The mixture, at 70 ~ 75 ℃ soaking polyethylene plastic, is conducive to enhancing the adhesion of the ink film on the plastic surface.
Polypropylene (PP) plastic: polypropylene plastic over the years is one of the important species development. The method is suitable for all molding. Do all kinds of pipes, all kinds of box and film and fiber. Industrial polypropylene having a high degree of spatial regularity, a high degree of crystallinity, and other macromolecular chains now index 89 to 95% range, also contain small amounts of amorphous atactic and crystalline low dimensional block structure. Melting point in the range of 170 ~ 175 ℃, a glass transition temperature of isotactic polymer -13 ~ 0 ℃, and syndiotactic polymers of O ℃. Concentrated nitric acid, fuming sulfuric acid can etch polypropylene, at higher temperatures, can be dissolved in aromatic and chlorinated hydrocarbons, at room temperature can only make it swell. Acids and esters, it also has some dissolution, regulations and other aggregate content increased with increased solvent resistance have been increased.
Overall polyethylene and polypropylene are the high degree of crystallinity, low surface tension polymer material non-polar molecular structure. In their molecular structure is not like carbon group, a carboxyl group, a hydroxyl group such polar groups, compared with the polyethylene, polypropylene finishes easier.
The plastic components of electronic products screen printing electronic products, especially radio products such as radios, tape recorders, television sets, for the appearance of the requirements are high. Graphic designers for exterior decoration products is very important, and less technology currently used for exterior decoration of our country, limiting the idea of artists, allowing them only by the size of products, the use of various lines, the plastic itself limited color, to change the appearance of the product. After the plastic screen developed for decorative electronic products bring convenience, so in recent years, a variety of electronic products, domestic plastic screen been widely used.
5. Screen printing plastic signs in recent years, after the plastic plate and plastic molding silk screen graphic text decorative components developed rapidly. As hard board PVC (PVC board), polycarbonate, ABS, PMMA, modified polystyrene plastic laminate is carried out by screen printing, it has been widely used, and achieved good decorative effect and economy benefits.
6. Soft, screen printing, silk screen ① plastic hoses rigid plastic parts. There are several ways printed plastic hose, the main way for the thermal transfer method. Thermal transfer dye sublimation method is to use ink or other material, the first graphic printed on transfer paper, and then bonded together with the substrate is heated from the back of the transfer paper, so the paper will dye sublimation Graphic transferred to the substrates. Plastic hose after surface treatment, is Sun Gas, the transfer paper from between the hose and a heating iron by heating iron transfer paper into the hose, heat transfer is completed. After the transfer tube into the drying apparatus, the drying temperature is generally about 65 ℃. ② soft plastic screen printing. Used for the production of soft plastic toys, such as inflatable cartoon toys. Usually the first on a sheet of plastic soft silk pattern, then the crop, the production of synthetic heat. The material thickness is 0.8 ~ 3.0mm. If screen printing two or more colors, most of the plastic will stretch, the second track error occurs chromatic color and the first color. This chromatic error commodity lost their original value, can not be as qualified products on store shelves. To this end, multi-color printing can be fixed only use soft plastic benches presses and no other way. Conduct long printing press, the substrates to be fixed using an adhesive. It is worth noting that the toy printing standard requirements must be non-toxic and harmless ink. ③ hard plastic screen printing. There are two hard plastic products hard plates and moldings. Tickets, signs, instrument dials, cosmetic containers are made of hard plastic.
Surface material according to the instrument panel screen printed panel may be metal, plastic and paint, the appropriate choice of ink printed on the panel in some text and graphics, showing some of the features of equipment, but also beautify the panel. Screen printing of text and graphics requirements of clarity, good adhesion, abrasion resistance, and also requires soft colors and elegant, giving people a sense of beauty. Here we discuss how to use the screen-printing process to improve the quality of the panel.
8. Polyester screen printing color signs polyester plate is a new breed of domestic signs in recent years it has rapidly developed. Because of its colorful, decorative, and easy to apply, the manufacturing method is simple, low cost, etc., and therefore welcomed by the majority of users, and quickly on a high, medium and low-grade electronic products, household appliances, as well as cultural goods has been universal application. Currently there are many specialized factories to produce such signs. However, because the production process of these factories are in accordance with need large quantities of plate processing design, so for those varieties, a small number of polyester label products, either from the process, or production cost point of view, are unable to adapt. Here are a polyester for printing color signs by screen printing technology for small-volume, multi-colored polyester label producer reference varieties.

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