FIBERGLASS REINFORCED LAMINATES (LAMINATED MATERIALS), ELECTRONIC WIRING BOARDS, AND PART ASSEMBLY PROCESSES Russian patent published in 2004 - IPC

FIELD: electrical engineering; reinforced laminates for printed- circuit boards. SUBSTANCE: laminate incorporates reinforced fabric of threads including E glass fibers coated with material compatible with polymeric matrix material. Calcination loss for threads amounts to 0.01 - 0.6 mass percent and tractive force in transport under impact of air jet is about 100 000 effective gf per 1 g of yarn mass, amount of loss being evaluated by means of needle air-jet nozzle assembly with internal air-jet chamber, 2 mm in diameter, and nozzle outlet pipe, 20 cm in length, at yarn feed speed of 274 m per minute and air pressure of 310 kPa. Bending strength of such laminate in filling direction is 3•10⁷ kg/sq. m. Thread coating may include polyester and polymer chosen from polymers of vinyl pyrrolidone, vinyl alcohol, starches, and mixtures thereof. Coefficient of thermal expansion of laminate in direction of z axis is below 4.5% at 288 C. EFFECT: enhanced strength characteristics of laminates. 58 cl, 7 dwg, 14 tbl