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US 5,843,534 AGranted
Screen printing of surface layers
AssigneeIndustrial Technology Research Institute
InventorsDe-An Chang, Jin-Yuh Lu
Life of this patent
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Abstract
A formulation of solid powder, a solvent system, a binder material, and a plasticizing agent is described whose accomplishment is achieved by means of a step-by-step process. The pastes so formulated can be employed in a screen printing process to produce surface layer patterns with various specific physical properties such as phosphorescence, electrical conductivity, mechanical adhesion, and dielectric properties as desired.
Claims6
A method for forming surface layer patterns exhibiting specific physical properties comprising:
- formulating a paste comprising the steps of:
- blending of two solvent components by ultrasonic agitation;
- adding binder material to the solvent by heating to between about 80.degree. and 120.degree. C. for between about 45 to 75 minutes;
- adding a plasticing agent to the paste;
- passing the paste through a sieve to remove particulates;
- adding a solid powder;
- and
- milling the paste in a three-roll milling system;
- applying the paste to a fine-mesh screen in contact with a pattern stencil adjacent to a surface to be patterned;
- forming a layer pattern of paste material on the surface by forcing the paste through the stencil openings and screen mesh onto the surface by means of a squeegee;
- and
- post-screening conversion of the paste pattern to the corresponding pattern of desired material by appropriate treatment.
9 more elements
Dependencies are inferred from the claim text.