Electronic designers utilize the terms screen printing, screen printing legend and silk screen to signify composing on a printed circuit board. Screen printing is undeniably more advantageous and adaptable than other customary printing strategies. For a certain something, the surface doesn’t need to be printed under tension, in contrast to carving or lithography, and it doesn’t need to be planar. Screen printing inks can be utilized to deal with an assortment of surfaces -, for example, materials, earthenware production, metal, wood, paper, glass, and plastic. Thus, screen printing is utilized in various enterprises, from dress to item marks to heavy copper pcb printing.
The screen printing innovation is fairly basic and doesn’t call for high abilities. A screen is made out of a bit of permeable, finely woven texture – initially made of silk, yet now they are made of polyester or nylon – extended over a wooden or aluminum outline. Regions of the screen are closed off with a non porous stencil which is a negative of the picture to be printed. As such, the open spaces are the place where the ink will show up. The screen is set on top of a bit of dry paper or texture. Ink is put on top of the screen, and a squeegee or elastic cutting edge is utilized to push the ink uniformly into the screen openings and onto the substrate. The ink goes through the open spaces in the screen onto the paper or texture put under and afterward the screen is removed. The screen can be re-utilized subsequent to cleaning.
The gadgets Printed Circuit Board industry is developing at a genuinely quick speed as new financially savvy creation advances are opened up. Direct advanced printing is usurping the conventional photolithography and screen printing measures that have administered the PCB business throughout the previous twenty years. Direct computerized printing is utilized to individualize PCBs only preceding their get together. The conspicuous point is to print a one of a kind blemish on each board that can be later used to recognize the board. The imprint should be lasting and inerasable and will ordinarily contain 1D or 2D machine comprehensible codes alongside alpha numeric characters.
Enormous scope producers of PCB state 1,000,000 sheets and more for every year use screen printing with thermally relieved ink to print the legends that cover each side of the board. Thusly, computerized printing can not print the entire side of a board at a value that will be serious with screen printing costs. A few different alternatives for individualizing are anyway accessible including Preprinted Label Application, Solvent Based Continuous Ink Jet Digital Printing, Laser Ablated Ink Patches and so on
Preprinted Label Application: People who production low volumes of PCBs start with names imprinted on office gear and hand applied to each PCB either preceding or after gathering. In any case, if the item volumes shoot up, the dependability and cost of hand applying names turns into an issue. Computerized frameworks that print and apply names are likewise accessible. The debilitation is these frameworks should put names precisely because of PCB space imperatives.