How You Can Screen Print On Plastic Products?

Learn how to display print on plastic products?

The display screen printing is the secondary processing of virtually all sorts of plastic merchandise. The reason is primarily decided by the properties of the plastic itself, such as its simple dyeability, and the week solarised colorfastness. To compensate for these shortcomings and to enhance the appearance of plastic products, secondary processing is necessary. Plastic printing refers to the technical strategy of transferring visual authentic info/image onto a plastic product utilizing a printing display screen or different ways. Printing on plastic merchandise includes gravure printing, flexographic printing, display screen printing, anti-counterfeiting printing, and jet printing, transfer printing, and many others particular printing strategies. Nowadays, it has been in a position to print on plastic merchandise with different floor textures, totally different hardnesses, and completely different shapes, and is broadly used for decoration of plastic packaging films and plastic containers.

There are many types of plastic products. If they are labeled by the screen printing method, the sheet and airplane plastic use plain display screen-printed, the cambered surface use curved silk display screen printing, and the abnormity is utilizing oblique display printing.

The plastic items comprise a polar substance in its molecular structure, which has excellent chemical stability, it’s corrosion-resistant to most acid and alkali, and insoluble in common solvents at normal temperature. Moreover, additives reminiscent of antioxidants and stabilizers are added into the ink scale back the affinity between the plastic floor and the ink, also the ink dried slowly after printing. Meanwhile, the plastic surface does not have the porosity like the paper might absorb the ink. Therefore, the surface of the plastic objects to be printed needs to be processed before printing, that might improve the adhesion of the ink to the plastic gadgets, make the ink layer adhesive firmly, the screen printed image more distinct, complete and vivid. Specific therapy could also improve the floor properties of plastics instantly, similar to antistatic property, and so forth.

There are primarily the following substrates of plastic products appropriate for display printing:

Polyvinyl chloride plastic. Polyvinyl chloride (PVC) was put into industrial production in 1931. Polyvinyl chloride plastic has the advantages of brilliant colour, anti-break, acid & alkali resistance, and low cost value. However, the addition of some auxiliary materials throughout PVC manufacturing is normally toxic, so PVC products can’t use for meals container. PVC movie has a large variety of colours, and most of the commercially available colorful plastic sheets and artificial leathers are polyvinyl chloride merchandise.

ABS plastic. ABS resin plastic is an engineering plastic. In recent times, it has been widely utilized in televisions, calculators, and different products in addition to in lots of areas of the nationwide industries. ABS plastic is a terpolymer of acrylonitrile, butadiene, and styrene, it has the standard traits of three components. Acrylonitrile makes the copolymer has chemical corrosion-resistant and particular floor hardness; butadiene makes the polymer have rubber-like toughness; The polymer has characterized of easy course of & forming.

Polyethylene (PE) plastic. Polyethylene plastics are broadly used and might be made into numerous finished products by extrusion molding, injection molding, and other molding processes. The molecular chain of polyethylene consists of a protracted string of methylene groups, which containing pendant groups. The longer the pendant group within the polymer chain, the decrease the crystallinity of the polymer. That is to say, the upper the density of polyethylene, the extra unfavorable surface printing. Polyethylene is insoluble in numerous solvents, nevertheless, when the temperature exceeds 70 ° C, polyethylene may be ratherish dissolved within the solvent similar to toluene or amyl acetate. This makes it potential to polyethylene floor printing. Soaking the plastic into a heating solvent to destroy the surface to extend the adhesion of the ink film on the PE plastic floor. A mixture of fuming sulfuric acid concentrated nitric acid, chromic acid, and sulfuric acid could corros on polyethylene slowly at regular temperature; sulfuric acid and nitric acid can destroy polyethylene rapidly at 90a hundred 100 one hundred °C. Mix the heavy potassium plumbite, sulfuric acid & distilled water, soak the PE plastic in the mixture at 7075 seventy five °C, which is helpful to reinforce the adhesion of the ink movie on the plastic surface.

Polypropylene (PP) plastic. Polypropylene has been one of many essential number of plastics within the years of improvement. Suitable for all molding strategies. Can be processed to all sorts of pipes, bins, containers, films & fibers, etc. Industrial polypropylene has a high spatial regularity, high crystallinity, equal index ratio 89% to 95%, accommodates just a little of macromolecular chains of amorphous stereostructure and low crystalline stereoblock. It’s melting level 170-175 ° C, the vitrification temperature is -13 ° C -zero ° 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 higher temperatures, and can only be expanded at room temperature. Acids and esters might also dissolve them, and solvent resistance increases as the content of isotactic polymers will increase. All display printing requires the display as a substrate. Framed display screen with the graphic course of. The five main components of screen printing: screen printing display, squeegee, ink, printing plat, and substrate. The silkscreen mesh on the screen body could be transmitted via the ink, and the non-image area of the coustic mesh can not. When printing the plastic product, pour the ink at one end of the display screen printing screen, urgent and slipping the squeegee with the ink to the other end of the display, and the ink is scraped via the display screen 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, excellent impression strength and floor hardness underneath particular temperature range, and wonderful dimensional stability. A lot of the ABS resins plastic remain favorable influence energy. Toughness at -forty ° C. The ABS resin merchandise are widely used at -40 ° C to 60 ° C temperature. The ABS resin merchandise are broadly used at -40 ° C to 60 ° C temperature. ABS plastic has a excessive molecular weight, good physical properties, good molding property, and excellent printability.

The phrase keys are rapped ceaselessly, it requires glorious adhesion of the characters to the plastic keys, good wear resistance, solvent resistance, and sweat resistance. The phrase key has a very small area (the minimum measurement is 6.8mmx3.5mm), which need high printing precision and large quantity. It is inappropriate to make use of the reverse paste technique. Therefore, screen printing is perfect. Jig the phrase keys to solve the problem convex floor in the course of the screen printing.

For the ink choosing, as a result of less brightness and color of plastic inks, straightforward to block 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, moderate viscosity to anti-blocking display, and robust adhesion to the ABS plastic. The ink can not be excessive viscosity; otherwise, the printed phrases may be rubbed off with fingers by regular power simply. In the event you loved this short article and you wish to receive more info about coustic mesh [4mark said] assure visit our webpage. Also, after the ink drying, a skinny layer of varnish should be sprayed onto the floor, to improve the brightness and protect the ink layer considerably.

The ABS keyboard silk display printing course of is as below:

Silk screen printing mesh preparation. Use 230 mesh depend, mesh stretching, and cleansing.

Screen making. Use photosensitive adhesive display screen making or film display screen making method.

Pre-processing of plastic components. Soaking with degreaser and washing.

Screen printing. Set the ABS plastic keys with special fixtures, and display printing use the dedicated ink.

Initial inspection. Cleaning the unqualified with alcohol and re-display printing.

Drying. Oven-baked at 60 ° C for 0.5 hours or at room temperature for 2 hours.

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