Process and apparatus for resin impregnation of a fibrous substr

Details Process and apparatus for resin impregnation of a fibrous substr Process and apparatus for resin impregnation of a fibrous substr

1994-05-25

1996-02-20

Bell, Janyce

Coating processes

Application to opposite sides of sheet, web, or strip

Roller applicator utilized

4273898, 427428, B05D 100

Patent

active

054927226

ABSTRACT:
Apparatus and process are described for impregnating a fibrous substrate with a thermosettable resin. The process involves the use of resin application means comprising a moving surface on which is positioned a liquid-form thermosettable resin in essentially uncured state, passing a fibrous web in countercurrent contact with the thermosettable resin so as to transfer the thermosettable resin into the fibrous web, 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 movable surface; means for applying a liquid-form thermosettable resin onto the movable surface; means for advancing, in a countercurrent direction with respect to the direction of motion of the movable surface, a fibrous web to the movable surface and in contact with the thermosettable resin thereon and thence to a resin cure zone; and means not in contact with the opposite side of the fibrous web at the point of resin transfer for maintaining tension in the glass web sufficient to promote transfer of the liquid resin film from the movable surface into the interior of the glass web.

REFERENCES:
patent: 3826703 (1974-07-01), Russell
patent: 3881445 (1975-05-01), Nothinger
patent: 4139591 (1979-02-01), Jurisich
patent: 4185133 (1980-01-01), Woemer
patent: 4327143 (1982-04-01), Alvino
patent: 4767643 (1988-08-01), Westervelt
patent: 4774107 (1988-09-01), Kwiatkowski et al.
patent: 4804509 (1989-02-01), Angell
patent: 4886684 (1989-12-01), Schnell et al.
Encyclopedia of Chemical Technology, 3rd Ed., "Coating Processes," pp. 386-426 (no date).
"Formulating with Dow Epoxy Resins: Electrical Laminates," Dow Chemical Company (1990). (no mo.).

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