High Definition Stencils With Easy to Clean Properties for Screen Printing
AssigneePhoto Stencil, Inc.
InventorGuocun Chen
Life of this patent
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Abstract
This invention is for production of a screen printing stencil system with hard nickel or nickel-cobalt base metal foil (10) with amorphous carbon nanocomposite intermediate layer having low coefficient of friction (30) and alternative layers of amorphous carbon nanocomposite (41) and amorphous fluorocarbon (42) optimized for its wettability in broad contact areas between squeegee blade and the stencil and oleophobic amorphous fluorocarbon-rich coatings (43) on the inner walls of through holes (20) and (21) to provide easy release of solder paste or metallic paste for high definition screen plating of small feature dimensions and easy to clean properties. US Patent Documents (1) 20130220152 Febuary 2013 K. Shibusawa (2) 6228471 B1 May 2001 Neerinck et al
Claims21
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The process for manufacturing of the stencil system comprising the steps of
- a. plating a base nickel layer in a nickel sulfamate solution for enhanced surface smoothness;
- b. develop the designed features of a PCB through photolithographic process on the base nickel layer;
- c. electroforming the hard nickel or nickel-cobalt stencil base metal (10) in the said solutions;
- d. deposition of the said intermediate amorphous carbon a-C:H and a-Si:O, nanocomposite layer (30) and (31) in a vacuum chamber using PACVD, PVD, and FAPVD technology;
- and
- e. deposition of the said alternative layers of alternative layers (40) of hydrophilic a-C:H and a-Si:O nanocomposite (41) and fluorinated a-C:H and a-Si:O (42).
- f. deposition of the said fluorocarbon-rich top layer (43) on the inner walls of the featured through holes (20) and (21).
A substrate stencil comprising:
- a metal substrate including nickel or a nickel-cobalt alloy and forming at least one aperture, the metal substrate having microhardness in range between 440 and 580 Vickers.
Dependencies are inferred from the claim text.