METHOD OF MAKING FIBROUS COMPOSITES BY VACUUM INFUSION AND DEVICE TO THIS END Russian patent published in 2013 - IPC B29C70/44 

FIELD: process engineering.

SUBSTANCE: set of invention relates to making parts hardened by fibers from dry workpiece based on composite by vacuum infusion. Proposed method comprises placing preform with distribution fabric into working chamber. Then, rarefaction P₁ is created in vacuum chamber for feeding resin to fibrous preform and injecting resin therein for its impregnation. Thereafter, preform impregnated with resin is hardened to produce fibrous composite. Note here that air and gaseous inclusions are continuously removed from working chamber on preform opposite sides through first and second semi-permeable membranes into first and second chambers, respectively. Identical rarefaction P₂ and P₃ other than P₁ in said working chamber. Note here that difference in rarefaction P₁, P₂ and P₃ in vacuum channels allows transfer and removal of gaseous inclusions and excess resin from working chamber confined by preform and second semi-permeable membrane that does not contain distribution fabric into vacuum channel with rarefaction P₁ by placing working chamber drainage material therein above preform. Proposed method comprises first chamber confined by fixture and first semi-permeable membrane secured thereat by tight sealants. First chamber comprises first chamber drainage material and is communicated via vacuum channel with second rarefaction source. Proposed device comprises working chamber confined by first and second semi-permeable membranes. Said working chamber is connected via vacuum channel with first rarefaction source and communicated via resin feed channel with vessel with resin. Device comprises second working chamber confined by second semi-permeable membrane secured at fixture by tight sealants and gas- and resin-tight membrane secured at fixture by tight sealants. Second chamber comprises second chamber drainage material and is communicated via vacuum channel with second rarefaction source.

EFFECT: higher quality of fibrous composites.

10 cl, 5 dwg