Apparatus and method for screening green sheet with via hole usi

Stock material or miscellaneous articles – Structurally defined web or sheet – Including aperture

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428131, 428137, 428138, 428145, 428901, 156 8912, 156 8928, 264651, 264614, 264619, 264660, 264672, 427 97, 427 96, 427261, 427191, 4273722, 29851, B29C 3700, B32B 324

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active

057596697

ABSTRACT:
The present invention relates generally to a new apparatus and method for screening using porous backing material. More particularly, the invention encompasses an apparatus that uses a porous backing material which is adhered to a green sheet during the screening process. Basically, a backing layer having a very high porosity is adhered to a green sheet, while the green sheet is screened. During the drying process of the green sheet some of the screening fluids are absorbed by the porous backing layer, which allows the screened vias of the green sheet to have a smooth surface.

REFERENCES:
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patent: 5130067 (1992-07-01), Flaitz et al.
patent: 5139712 (1992-08-01), Hese et al.
patent: 5198162 (1993-03-01), Park et al.
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patent: 5273657 (1993-12-01), Nakashima et al.
patent: 5290504 (1994-03-01), Milkovich et al.
patent: 5387474 (1995-02-01), Mikeska et al.
K. S. Desai et al., "Backing Material for MLC Screening", IBM Technical Disclosure Bulletin, vol. 24 No. 10 p. 5119 Mar. 1982.

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