초록 ▼

To avoid distortion of metal strips flanking the glass fiber resin layers in a system for fabricating circuit board structures in a continuous press, the metal foil webs are bonded to glass fiber webs before the layers are introduced into the mouth of the continuous press and only in the mouth do co

To avoid distortion of metal strips flanking the glass fiber resin layers in a system for fabricating circuit board structures in a continuous press, the metal foil webs are bonded to glass fiber webs before the layers are introduced into the mouth of the continuous press and only in the mouth do composite layers meet additional glass fiber and resin layers.

대표청구항 ▼

A method of making a circuit board structure, comprising the steps of: (a) uniting a strip of a metal foil and a glass-fiber strip containing a thermally hardenable synthetic resin at a contact interface therebetween to form a two-layer composite strip; (b) continuously feeding said composite strip

A method of making a circuit board structure, comprising the steps of: (a) uniting a strip of a metal foil and a glass-fiber strip containing a thermally hardenable synthetic resin at a contact interface therebetween to form a two-layer composite strip; (b) continuously feeding said composite strip and additional continuous glass-fiber strips containing thermally hardenable synthetic resin together into a mouth of a continuous press between a pair of juxtaposed drums around which pressing belts are guided to form said mouth and between said pressing belts so as to form continuously a stack of said strips with said metal foil forming an outer surface of said stack, whereby said two-layer composite strip meets layers formed by said additional strips in said press, said uniting of step (a) comprises said metal foil and said glass-fiber strip being held under tension and applied to an arcuate portion formed by one of said belts as it rotates around a respective one of said drums and against which surface the layers of said two-layer composite strip are united; (c) passing said stack between said pressing belts through said press while heating said stack so as to merge said glass-fiber strips, compact said stack and harden said resin and form a continuous board, said metal foil and said glass-fiber strip united therewith shielding said additional glass-fiber strips from heat radiation emanating from at least one of said belts and from a respective one of said drums whereby said additional glass-fiber strips pass into said mouth without being subjected to detrimental thermal radiation; and (d) cooling said board.