Browse Prior Art Database

Pressure Pad for High Temperature Lamination

IP.com Disclosure Number: IPCOM000100588D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Ellis, TL: AUTHOR [+3]

Abstract

Disclosed is a pressure pad for lamination of dielectric materials that require a high temperature for the material to flow. Typically, thermoplastic materials, such as polytetrafluoroethylene, require a temperature of 700 degrees Fahrenheit or greater for lamination into printed circuit cores and/or composites. At these temperatures, the pressure pad material usually used for lamination, i.e., blotter paper, burns in the lamination press. This invention covers the use of a reusable pressure pad formed from glass cloth, and enveloped in a thin metal foil, as depicted in the figure.

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Pressure Pad for High Temperature Lamination

       Disclosed is a pressure pad for lamination of dielectric
materials that require a high temperature for the material to flow.
Typically, thermoplastic materials, such as polytetrafluoroethylene,
require a temperature of 700 degrees Fahrenheit or greater for
lamination into printed circuit cores and/or composites.  At these
temperatures, the pressure pad material usually used for lamination,
i.e., blotter paper, burns in the lamination press.  This invention
covers the use of a reusable pressure pad formed from glass cloth,
and enveloped in a thin metal foil, as depicted in the figure.

      In a typical embodiment, the laminating press would be loaded
with the following pieces:
1.  A carrier plate to hold the part(s) to be laminated.
2.  A pressure pad, consisting of two sheets of aluminum foil with
eight sheets of glass cloth in between.
3.  A stainless steel planishing plate.
4.  The part to be laminated, consisting of two sheets of copper,
with the high temperature dielectric in between.
5.  A stainless steel planishing plate.
6.  A pressure pad, consisting of two sheets of aluminum foil with
eight sheets of glass cloth in between.

      The press is then closed upon the assemblage, heat and pressure
are applied, causing the dielectric material to soften and flow,
forming the laminate.  The glass cloth pressure pad applies uniform
pressure across the laminate, resulting in a very uniform thickness...