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The Different Between Aluminum the Pattern Silk Screen Process and the Pattern Exposure Process

Pattern Silk Screen Process Machine required:  
Pattern Silk Screen Machine —Machine Hot Drying Machine —Etching Machine —Film Stripping Machine—Solder Mask Silk Screen Machine—Hot Drying Machine—Component Silk Screen Machine—Hot Drying Machine—Drilling Machine— V-cut Machine— Punching Machine— OSP— Packing Machine 

Screen printing process is to print the component shape, serial number and other descriptive text on the component surface or solder surface through screen printing, to facilitate the production process of circuit board plug-in (including surface packaging components of the patch) and future product maintenance operation.

The pattern silk screen process is light solid/heat solid ink, you can produce screen printing in a room, but can not guarantee the smooth surface of the plate itself, the alignment of the pad and so on, if it is white for a long time, it is easy to appear yellow and other phenomena, not up to the required luminous rate. 

And like also can not meet the requirements on some precision, such as a 3014 lamp bead welding plate, and made by screen printing process, bonding pad will be easy to shrink a lot, welding plate edge like jagged uneven, thus easy to cause brush solder paste and paste lamp bead difficulty, prone to invisible virtual welding problem, not only affects the accuracy of patch of light bead, There is also the result that the lamp bead life cannot be expected normally. 

The Pattern Exposure Process machines required： 
Coating Machine—Drying Oven—Exposure Machine—Developing Machine—    
Solder Mask Silk Screen Machine—Drying Oven—Component Silk Screen Machine—Drying Oven—Drilling Machine—V-cut Machine—Punching Machine—OSP—Packing Machine 

The pattern exposure process is to transfer the image from the original film to the photographic substrate by the action of the light source.

The pattern exposure process ink is must be adopted by the photosensitive ink, must be in grade 100000 dust-free workshop environment production, ensure the plate printing ink without any garbage and granular, there also need to print after curing with exposure machine graphics transfer, to development, that is to increase the two working procedure, has increased the utilities, Ink thickness to reach 15UM to 20UM so as to ensure that the board ink 266 degrees is not yellow, the reflectance rate reaches more than 92 percent, which produces a photographic process production cost and efficiency problems, so the LED aluminum substrate price is high. 
Like some 4MM board width and 0.2 line width line distance requires high precision board screen printing process is unable to achieve this requirement. 

https://www.youtube.com/watch?v=mfUUad9b58Q&ab_channel=CynthiaLi