Stencil Outer Attracting Means for Printing Accuracy
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Solution Overview
Problem
Screen printing devices face challenges in maintaining printing accuracy due to stencil positional displacement during the printing process, which is exacerbated by the formation of hollows under negative pressure, leading to uneven paste application and reduced accuracy.
Innovation Solution
The implementation of outer attracting means on the printing device, positioned outside the squeegee sliding region, to securely hold the stencil in place using suction holes, preventing positional displacement and ensuring accurate paste application by avoiding deformation-induced hollows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If suction holes are provided on clamps to hold the stencil by negative pressure, then positional displacement of the stencil is prevented, but hollows are formed in the stencil causing cream solder to trail and printing accuracy to deteriorate
Solution Approach 1:
The attracting function is segmented into two distinct systems: inner attracting means (suction holes in clamps) for preventing stencil displacement, and outer attracting means (suction holes in outer clamps) for preventing hollow formation. This segmentation allows each system to perform its specific function without interfering with the other, resolving the contradiction between stability and precision
Solution Approach 2:
The outer attracting means acts as an intermediary system that provides additional support to the stencil at the edges, preventing the formation of hollows that would otherwise occur due to the inner suction holes. This intermediary system maintains both stencil stability and printing accuracy by distributing the suction forces more evenly
2Manufacturing precision
If sucking force by clamps is reduced to prevent hollows, then cream solder trailing is prevented, but holding force for the stencil deteriorates causing positional displacement
Solution Approach 1:
The holding function is segmented between inner clamps with suction holes for precision control and outer clamps with suction holes for stability control. This allows the inner clamps to use reduced sucking force without compromising overall stencil stability, as the outer clamps provide the necessary holding force
Solution Approach 2:
The inner and outer attracting means are combined to work together as a unified system. The outer attracting means complements the inner system by providing additional holding force at the stencil edges, allowing the inner clamps to operate with reduced suction force while maintaining both stability and precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances printing accuracy by maintaining stencil stability and preventing paste trailing, resulting in consistent and precise application of paste onto the substrate.
Implementation Method 1
outer attracting means, provided on an outside of a squeegee sliding region in which the squeegee slides over the stencil, for holding the stencil by attracting an undersurface side thereof
Data Source
AI summary
A printing device capable of improving the printing accuracy by preventing positional displacement of a stencil applies paste on a stencil onto a substrate by spreading the paste by sliding a squeegee along a surface of the stencil disposed on the substrate. Outer attracting means for holding the stencil by attracting an undersurface side thereof is provided on the outside of a squeegee sliding region in which the squeegee slides over the stencil.