Browse Prior Art Database

Cavity Lamination to Size Process

IP.com Disclosure Number: IPCOM000045819D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Fessel, BS: AUTHOR [+4]

Abstract

A new cavity lamination process is provided for use in the manufacture of multilayer ceramic substrates. Subsequent to the punching and screening operations, the green sheets are stacked in a prescribed order. This stack is then placed in the lamination die, which is mounted in a 200-ton hydraulic lamination press, then blanked and laminated in accordance with the present process.

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Cavity Lamination to Size Process

A new cavity lamination process is provided for use in the manufacture of multilayer ceramic substrates. Subsequent to the punching and screening operations, the green sheets are stacked in a prescribed order. This stack is then placed in the lamination die, which is mounted in a 200-ton hydraulic lamination press, then blanked and laminated in accordance with the present process.

The stack of green sheets is put on a cutting die and moved to a partial close or a pre-set position under low to medium pressure, typically 20,000 lbs. At this position, the stack of green sheets is almost contacting the edge of the cavity which has a complementary shape with respect to the cutting die. The stack is preheated, typically at 168 degrees F for 1.5 minutes.

Then, the stack is cut at a high pressure, typically 80,000 lbs., and laminated at this pressure for two minutes. Alternatively, the stack can be blanked at a medium pressure, such as 20,000 lbs., and laminated at a high pressure for two minutes. The die is opened, and the blanked laminated plate of green sheets is taken out of the die for a subsequent cycle of sintering. This blanking and laminating process produces j smooth undistorted laminate edge.

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