Continuous process for the manufacture of substrates for printed wire boards
AssigneeAkzo N.V.
InventorErik Middelman
Life of this patent
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Abstract
A method for the manufacture in a continuous process of a flat substrate from a fibres-reinforced matrix for a printed circuit, in which use is made of at least two moving layers of reinforcing fibres and the fibres are positioned in at least two crossing directions, whereupon the filaments layers provided with matrix material, optionally together with one or more electrical conducting layers, such as a metal foil, and/or insulating layers on one or on either outer side, are passed through a preferably heated laminating zone, such as a double belt press, characterized in that use is made of filaments-containing layers made up of a plurality of mutually parallel filaments that are not bonded in the form of a fabric and extend substantially linearly.
Claims25
A continuous process for the manufacture of a printed wire board from a fiber-reinforced matrix, the continuous process comprising a laying stage in which at least two layers of wholly unbonded unwoven threads of reinforcing fibers are superposed and laid on a transport element moving in a plane continuously in a production direction, an impregnation stage in which the layers of threads are passed through an impregnating zone to provide the layers with matrix material and a lamination stage in which the layers of threads are passed through a laminating zone to form a laminate of the layers of threads provided with matrix material, the laminate being provided on one side or on both sides with means for generating electrically conductive tracks, said layers of threads being composed of a plurality of mutually parallel threads of reinforcing fibers which extend substantially rectilinearly, and the layers are superposed such that reinforcing fibers are disposed in at least two crossing directions while remaining wholly unbonded.
The process of claim 7, wherein the laying stage comprises superposing an odd number of layers of threads in the range of from 3 to 7.
The process of claim 7, wherein an overall amount of reinforcing fibers to be provided in one or more of said layers of threads in a particular direction, is substantially equal to the overall amount of reinforcing fibres to be provided in one or more layers of threads in a crossing direction.
A continuous process for the manufacture of multilayer printed wire board, comprising a laying stage in which a board provided on either side with conductive tracks is provided on either side with a layer of wholly unbonded unwoven threads of reinforcing fibers, an impregnation stage in which the layers of threads are passed through an impregnating zone to provide the layers with matrix material and a lamination stage in which the board provided with the layers of threads is passed through a laminating zone, said fibers are laid on a transport element moving in a plane continuously in a production direction, in which process use is made of threads-containing layers composed of a plurality of mutually parallel threads which extend substantially rectilinearly while remaining wholly unbonded.
Dependencies are inferred from the claim text.