Browse Prior Art Database

Film Carrier on Green Sheet

IP.com Disclosure Number: IPCOM000081460D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Desai, KS: AUTHOR [+2]

Abstract

A thin plastic or metal film is applied onto a green ceramic sheet, to improve its handling properties and dimensional stability. The film is also used as a via repair mask.

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Film Carrier on Green Sheet

A thin plastic or metal film is applied onto a green ceramic sheet, to improve its handling properties and dimensional stability. The film is also used as a via repair mask.

The film with high tensile and yield strengths, and which is compatible with the metal paste system such as the MYLAR* film 2, is laminated to the green ceramic sheet 3 at 150 degrees F and 100 - 130 psi to produce the structure shown in Fig. 1A. Locating holes 4 are punched through the composite 2, 3 as shown in Fig. 1B. Via holes 5 are formed as shown in Fig. 1C.

The composite 2, 3 is turned upside down and the vias 5 are filled with conductive paste, and lines 6 are screened onto the surface of the ceramic green sheet 3. Some of the vias 5 may not be completely filled, as shown in Fig. 1D. These vias may be completely filled by filling conductive paste through film 2, as shown in Fig. 1E. The film 2 is then peeled from the ceramic 3.

The use of the MYLAR carrier reduces the dimensional shrinkage of the green sheet due to paste solvents interaction. 1/2 mil thick MYLAR shows approximately a four times increase in the yield strength of the green sheet. The increase in the strength depends on the thickness and the mechanical properties of the film. * Trademark of E.I. du Pont de Nemours & Co.

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