Browse Prior Art Database

Temperature Control Plate

IP.com Disclosure Number: IPCOM000089016D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Wiley: AUTHOR

Abstract

This article describes a temperature control plate for use in a lamination press for laminating together the layers of a multilayer printed-circuit card or board.

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Temperature Control Plate

This article describes a temperature control plate for use in a lamination press for laminating together the layers of a multilayer printed-circuit card or board.

A laminating press can exhibit nonuniform temperatures during heating. This is known to cause misregistration in the circuit boards being laminated. The use of a pair of temperature control plates, one for each platen surface, minimizes the effects of this problem. Each control plate is constructed to have a variable thermal conductivity or a variable specific heat characteristic across its surface area. Each plate has roughly the size of the press platen, and has reduced thermal conductivity (or increased specific heat) in regions where the heat rise is most rapid. This reduces the heat transfer rate to the workpiece being laminated, and results in a uniform temperature profile at the workpiece even though the platen temperature profile is not uniform.

Fig. 1 shows a cross section of one embodiment of a temperature control plate. It consists of a metal plate with holes in it, the hotter areas having the most closely spaced holes and the cooler areas having fewer, if any, holes. Fig. 2 shows another embodiment of the control plate. In this case, the plate is comprised of two layers, one being a high thermal conductivity material (metal) and the other being a low thermal conductivity material (heat insulation). The thickness of the heat insulation material varies in accordance w...