The Right Way To Screen Print On Plastic Products
The way to display screen print on plastic merchandise?
The screen printing is the secondary processing of virtually all sorts of plastic merchandise. The reason being mainly decided by the properties of the plastic itself, similar to its simple dyeability, and the week solarised colorfastness. To compensate for these shortcomings and to enhance the looks of plastic merchandise, secondary processing is important. Plastic printing refers to the technical process of transferring visual original info/picture onto a plastic product utilizing a printing display or other methods. Printing on plastic products includes gravure printing, flexographic printing, display screen printing, anti-counterfeiting printing, and jet printing, transfer printing, and so on particular printing methods. Nowadays, it has been able to print on plastic merchandise with completely different surface textures, different hardnesses, and totally different shapes, and is broadly used for decoration of plastic packaging movies and plastic containers.
There are numerous types of plastic merchandise. If they're classified by the display screen printing methodology, the sheet and aircraft plastic use plain display screen-printed, the cambered floor use curved silk display printing, and the abnormity is utilizing indirect screen printing.
The plastic objects include a polar substance in its molecular structure, which has glorious chemical stability, it’s corrosion-resistant to most acid and alkali, and insoluble in frequent solvents at regular temperature. Moreover, additives akin to antioxidants and stabilizers are added into the ink scale back the affinity between the plastic surface and the ink, additionally the ink dried slowly after printing. Meanwhile, the plastic floor does not have the porosity just like the paper may absorb the ink. Therefore, the surface of the plastic gadgets to be printed has to be processed earlier than printing, that would enhance the adhesion of the ink to the plastic items, make the ink layer adhesive firmly, the display printed picture more distinct, full and vivid. Specific remedy could additionally enhance the floor properties of plastics immediately, such as antistatic property, and many others.
There are primarily the following substrates of plastic merchandise suitable for display printing:
Polyvinyl chloride plastic. Polyvinyl chloride (PVC) was put into industrial production in 1931. Polyvinyl chloride plastic has the advantages of vibrant shade, anti-break, acid & alkali resistance, and low cost value. However, the addition of some auxiliary materials during PVC manufacturing is normally toxic, so PVC products cannot use for food container. PVC movie has a large variety of colors, and a lot of the commercially available colorful plastic sheets and artificial leathers are polyvinyl chloride products.
ABS plastic. ABS resin plastic is an engineering plastic. In recent times, it has been widely utilized in televisions, calculators, and different products as well as in lots of areas of the nationwide industries. ABS plastic is a terpolymer of acrylonitrile, butadiene, and styrene, it has the typical characteristics of three elements. Acrylonitrile makes the copolymer has chemical corrosion-resistant and particular surface hardness; butadiene makes the polymer have rubber-like toughness; The polymer has characterized of simple process & forming.
Polyethylene (PE) plastic. Polyethylene plastics are widely used and can be made into numerous completed products by extrusion molding, injection molding, and other molding processes. The molecular chain of polyethylene consists of an extended string of methylene groups, which containing pendant teams. The longer the pendant group within the polymer chain, the lower the crystallinity of the polymer. That is to say, the higher the density of polyethylene, the extra unfavorable surface printing. Polyethylene is insoluble in various solvents, however, when the temperature exceeds 70 ° C, polyethylene can be ratherish dissolved in the solvent reminiscent of toluene or amyl acetate. This makes it doable to polyethylene floor printing. Soaking the plastic right into a heating solvent to destroy the surface to increase the adhesion of the ink film on the PE plastic surface. A mixture of fuming sulfuric acid concentrated nitric acid, chromic acid, and sulfuric acid may corros on polyethylene slowly at regular temperature; sulfuric acid and nitric acid can destroy polyethylene rapidly at 90100 a hundred one hundred °C. Mix the heavy potassium plumbite, sulfuric acid & distilled water, soak the PE plastic in the mixture at 70seventy five 75 °C, which is useful to boost the adhesion of the ink movie on the plastic surface.
Polypropylene (PP) plastic. Polypropylene has been one of the essential number of plastics in the years of improvement. Suitable for all molding methods. Can be processed to all kinds of pipes, boxes, containers, films & fibers, and many others. Industrial polypropylene has a high spatial regularity, excessive crystallinity, equal index ratio 89% to 95%, accommodates a little bit of macromolecular chains of amorphous stereostructure and low crystalline stereoblock. It’s melting level 170-175 ° C, the vitrification temperature is -13 ° C -0 ° C, and the syndiotactic polymer is zero ° C. PE plastic shall be etched in concentrated nitric acid and fuming sulphuric acid, and dissolved in aromatic hydrocarbons and chlorinated hydrocarbons at increased temperatures, and will only be expanded at room temperature. Acids and esters could also dissolve them, and solvent resistance will increase as the content material of isotactic polymers will increase. All screen printing requires the display screen as a substrate. Framed display with the graphic course of. The 5 main components of screen printing: screen printing screen printing mesh, squeegee, ink, printing plat, and substrate. The silkscreen mesh on the display body may very well be transmitted by way of the ink, and the non-picture space of the mesh can not. When printing the plastic product, pour the ink at one finish of the screen printing screen, pressing and slipping the squeegee with the ink to the opposite finish of the display, and the ink is scraped via the display mesh onto the plastic substrate to get the required image and characters.
Taking the character printing on the ABS plastic keyboard as an example, let’s look at the printing of specific plastic products. ABS plastic is usually used to make the keyboard due to its glossy appearance, low water absorption, glorious impact energy and surface hardness beneath particular temperature range, and glorious dimensional stability. Most of the ABS resins plastic remain favorable impact energy. Toughness at -40 ° C. The ABS resin merchandise are broadly used at -forty ° C to 60 ° C temperature. The ABS resin products are broadly used at -forty ° C to 60 ° C temperature. ABS plastic has a high molecular weight, good physical properties, good molding property, and wonderful printability.
The phrase keys are rapped frequently, it requires glorious adhesion of the characters to the plastic keys, good wear resistance, solvent resistance, and sweat resistance. The phrase key has a really small area (the minimal dimension is 6.8mmx3.5mm), industrial filter mesh which want excessive printing precision and enormous amount. It is inappropriate to use the reverse paste method. Therefore, display screen printing is perfect. Jig the phrase keys to resolve the problem convex surface through the screen printing.
For the ink choosing, due to the less brightness and color of plastic inks, easy to dam the display, and low adhesion, it’s not adapt to the keyboard. The important thing point to decide on the ink for ABS product is nice brightness, average viscosity to anti-blocking display, and strong adhesion to the ABS plastic. The ink cannot be high viscosity; otherwise, the printed phrases could be rubbed off with fingers by regular pressure simply. Also, after the ink drying, a skinny layer of varnish needs to be sprayed onto the floor, to improve the brightness and protect the ink layer significantly.
The ABS keyboard silk display printing process is as under:
Silk screen printing mesh preparation. Use 230 mesh depend, mesh stretching, and cleansing.
Screen making. Use photosensitive adhesive screen making or movie screen making methodology.
Pre-processing of plastic parts. Soaking with degreaser and washing.
Screen printing. Set the ABS plastic keys with particular fixtures, and screen printing use the devoted ink.
Initial inspection. Cleaning the unqualified with alcohol and re-display printing.
Drying. Oven-baked at 60 ° C for 0. Should you loved this informative article in addition to you would want to get more information with regards to coustic mesh (More inspiring ideas) i implore you to check out our internet site. 5 hours or at room temperature for two hours.