How to Determine The PCB Exposure Time & Positioning?
PCB exposure means that under UV irradiation, the photoinitiator absorbs light energy and decomposes into free radicals, which then lead to the polymerization and crosslinking reaction of luminescent polymerized monomers. After the reaction, a large molecular structure insoluble in dilute alkali solution is formed. Exposure is generally carried out in the automatic double-sided exposure machine. …
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