| 摘要 |
<p>A process is described for minimizing resin waste in the impregnation of a porous web with a thermosettable resin. The process involves the use of resin application means comprising a rotatable roller (4) on which is deposited a liquid-form thermosettable resin; passing a fibrous substrate (2) in countercurrent contact with the thermosettable resin on the rotating roller so as to transfer the thermosettable resin to the fibrous substrate (2), removing any untransferred resin from the rotating roller (4) and depositing the removed resin onto the fibrous substrate prior to contact thereof with the rotating roller; and passing the resin-containing fibrous web to a heating zone to partially cure the resin. 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.</p> |
