Apparatus and method for screening green sheet with via hole using porous backing material

US5759669A · kind A · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Jon A. Casey · Poughkeepsie, US
• Cynthia J. Calli · Newburgh, US
• Darren T. Cook · Newburgh, US
• David B. Goland · Sopot, PL
• John U. Knickerbocker · Wappingers Falls, US
• Mark J. LaPlante · Montgomery, US
• David C. Long · Wappingers Falls, US
• Daniel S. Mackin · Pleasant Valley, US
• Kathleen Mary McGuire · Plattekill, US
• Keith C. O'Neil · Hughsonville, US
• Kevin M. Prettyman · Holmes, US
• Michael Thomas Puchalski · Carmel, US
• Joseph Saltarelli · Poughkeepsie, US
• Candace A. Sullivan · Pleasant Valley, US

Key dates

• Filing date: Dec 22, 1995
• Grant date: Jun 2, 1998
• Expiry date: Dec 22, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24802
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

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.