Screen printing mesh technology, billboard printing, glass printing plants, clothing printing plants, etc. are often used.
We understand the role of screen printing in identification signs in detail. The overall production process of identification signs can be divided into four processes: modeling (sheet metal welding), surface treatment (paint separation), and instruction content (content printing) , Assembled. The process of indicating content is both a functional experience of signage and an artistic expression. Therefore, in the entire logo production, the successful printing of the instruction content represents half of the logo production.
The content of the signage is printed in various forms: screen printing, transfer printing, and UV printing. These methods have their own advantages and disadvantages. Because the signage is a custom product, the specifications are not uniform, and the size and material of the product are different (from as small as the product nameplate, department card, unit card, bathroom card, Taiwan sign, etc .; as large as the spirit fortress, publicity column, guide card, lobby Card, total flat sign and parking lot sign) This determines the limitations of the use of transfer and UV printing, and the characteristics of screen printing: low cost and strong adaptability determine the breadth of his use in identification signs And irreplaceable.
Control of printing process parameters
Separation speed and separation distance of template and PCB (Snap-off)
After the screen printing is completed, the PCB is separated from the screen printing template, and the solder paste is left on the PCB instead of the screen printing holes. For fine silk screen holes, solder paste may be easier to adhere to the hole wall instead of the pad. The thickness of the template is important. Two factors are advantageous, the pad is a continuous area. In most cases, the inner wall of the silk hole is divided into four sides, which helps to release the solder paste. Second, gravity and the adhesive force with the pads, the solder paste is printed within 2 to 6 seconds of screen printing and separation. Pull out the wire hole and stick to the PCB. In order to maximize this beneficial effect, the separation can be delayed, and the PCB can be separated slowly at the beginning. Many machines allow a delay after silk screen printing, and the stroke speed of the falling head of the table can be adjusted to be slow.
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