Appeal No. 1998-2119
Application No. 08/343,965
pressure is carried out on a laminated base material before
heat-pressing the base material and a metal foil together in a
molding machine. This precuring step eliminates wrinkles or
waves, which results from the difference in the thermal
expansion coefficient between the laminated base material and
the metal foil. The preferred embodiment of Figure 1
discloses four layers of impregnated cloth sheets (1)
laminated through a set of squeeze rollers (2), laying
polyethylene terephthalate films (4) on the cloth sheets and
laminating the films to the cloth layer via rollers (3). This
product is then heated in a hot air heating furnace (5)
without applying any pressure to carry out the precuring step.
Then, the polyethylene terephthalate films (4) are removed by
using wind-up rollers (6). To create the final laminate
assembly, metal
foils (8) are laid on the precured laminated cloth sheet by
rollers (7) and the composite is then subjected to a double
belt press (9) which provides heat and pressure to the
assembly for bonding the metal foils and the impregnated cloth
sheets together.
8
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