PROCESS AND APPARATUS FOR RESIN IMPREGNATION OF A POROUS WEB

摘要

A process and an apparatus are disclosed for impregnating a porous web with a thermosettable resin. The process involves the use of resin application means comprising a rotating roller (4) on which is deposited a liquid-form thermosettable resin in essentially uncured state, passing a porous web (2) in countercurrent contact with the thermosettable resin so as to transfer the thermosettable resin into the porous web, exposing the resin-containing porous substrate to an elevated temperature lower than that maintained for partial cure; and passing the resin-containing fibrous web to a heating zone to partially cure the resin and form a prepreg. The process is particularly suited for application of a solventless resin formulation to a glass web in the preparation of a prepreg for an electrical laminate. The apparatus includes resin application means comprising a rotating roller (4); means for applying a liquid-form thermosettable resin onto the rotatable roller; means for advancing, in a countercurrent direction with respect to the direction of motion of the roller, a fibrous web (2) to the roller and in contact with the thermosettable resin thereon and thence to a resin cure zone; and means (13) between the rotatable roller and the resin cure zone (14) to apply heat to the resin-containing substrate.