What is image transfer
What is image transfer
One of the steps in making a printed board is to transfer the circuit image from the photographic substrate to the copper-clad laminate to form a mask image that is resistant to corrosion or electroplating. Corrosion resistant images are used in the "print-etching process", in which a protective corrosion resistant material is used to form a positive image on a copper-clad laminate. Unwanted copper foil, which is not protected by an inhibitor, is removed in a subsequent chemical etching process. After etching, the corrosion resistant layer is removed to obtain the desired image of the bare copper circuit. And good plating image used in electroplating technology "", which is a protective corrosion resistant materials in copper clad laminate negative phase is formed on the image, the image is needed to copper surface, after dealing with the clean, coarsening, etc, on which the copper plating or plating metal layer (tin lead, tin, nickel, tin, gold, etc.), then remove the corrosion layer etching, metal plating layer corrosion effect in the etching process.
The above two processes are summarized as follows:
Printing etching process flow:
Blanking → board cleaning treatment → wet film coating → exposure → development (dry film sticking → exposure → development) → etching → film removal → enter the next process
The Tian plating process is summarized as follows:
Blanking → drilling → hole metallization → pre-copper plating → plate surface cleaning → wet film coating → exposure → development (paste dry film → exposure → development) → negative phase image formation
→ Graph copper plating → graph metal corrosion resistant layer → remove film → etching → enter the next process
There are two methods for image transfer, one is screen printing image transfer, one is photochemical image transfer. Screen printing image transfer cost is lower than photochemical image transfer, especially in the case of large production batch, but screen printing corrosion resistant materials usually can only produce more than or equal to.25 mm printed wire, and photochemical image transfer used photoresist long to produce high-resolution clear image. This chapter covers the latter approach.
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