A kind of manufacturing process of step formwork

Abstract

A production process of a step stencil. The production process flow is as follows: substrate processing (cutting) ->pre-treatment (degreasing, pickling, and sandblasting) -> film mounting -> double sided exposure -> double sided developing-> etching (a printing surface with up steps) -> film stripping -> pre-treatment (degreasing and pickling) -> laser cutting (openings of flat openings and up steps). The process includes etching and laser cutting steps, and a metal stencil having a printing surface with up steps can be produced by using the process. The metal stencil produced by using the process has a high position alignment precision of the pattern opening of the area of up steps with a substrate opening; walls of opening holes of the overall stencil are smooth and straight and without undesirable phenomena of burrs or jags, etc.; the metal stencil has good surface quality and no undesirable defects of deformation, whitening, etc.; and the COV of the board thickness uniformity is less than10%.

Description

technical field [0001] The invention relates to a preparation process of a stepped template, which belongs to the field of material manufacturing and processing, and specifically relates to a printing mask in the field of SMT with raised steps (up steps) on the printing surface and opening patterns in the raised step area. Mixed preparation process of the template. Background technique [0002] With the rapid development of my country's electronics industry, stencil printing technology has also been applied in the electronics manufacturing industry, and SMT printing is a typical example. In the manufacturing process of electronic products, soldering electronic components and PCB needs to put tin on the PCB first, and there are hundreds of pads on the PCB that need to be tinned. The position of each pad corresponds to the electronic component. The best way to accurately tin the pads that need to be tinned at one time is to print. The usual method used in the electronics man...

AI Technical Summary

Problems solved by technology

However, the opening precision of the steel mold made by the traditional technology through laser cutting technology cannot meet the requirements, and the quality of the board surface is not high enough.

However, the electroformed nickel mask is easy to form pinholes and rough spots on the surface of the plate, and the solution is unstable, high cost, and high energy consumption.

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