GB752464A - Process and plant for the industrial and continuous production of bodies in particular shaped bodies in a fibrous conglomerate particularly of glass fibres for thermal and other insulations - Google Patents

Abstract

752,464. Moulding binder-impregnated fibre. ALGEMEENE KUNSTVEZEL MAATSCHAPPIJ N.V. Feb. 22, 1954 [Feb. 20, 1953], No. 5109/54. Class 87(2) A fibrous body or mat, e.g. of glass fibre impregnated with a binding material, e.g. thermoplastic or thermosetting resin. is shaped by rolling and jets of gas are forced through the mat to serve the double purpose of facilitating the setting of the binding material and removing any excess thereof. The fibrous mat 10, after being impregnated by being passed through a bath 12 of liquid binding material, is drawn between two hollow rollers 16, 17 with their circumferential surfaces contoured so that they co-operate to roll the material into the required cross-section and then between two hollow rollers 18, 19 contoured to complete the shaping. The rollers may be contoured to shape two sections side by side. There may however, be one pair of rollers only as there may be more than two pairs, all of similar construction. The second or later pairs of of rollers may run at a higher speed to exert sufficient traction on the material. The walls of the rollers are perforated, and one of a pair e.g. 16, has inside it a nozzle, e.g. 23, through which gas is directed to the inside of the wall so that it passes through the perforations to the fibrous mat in the nip. After passing through the mat the gas passes through the wall of the other roller of the pair, e.g. 17, which is also perforated, carrying with it excess binding material which it has removed from the mat. The action may be assisted by suction inside the second roller, applied through an axial tube e.g. 26. Thenozzles 23 &c. may be movable and spring- pressed to maintain their ends in contact with the insides of their rollers, to prevent gas leakage. The excess binding material emerges through the perforations of the rollers, e.g. 17 and into a trough 25 whence it may be collected. When there are two pairs of rollers, as shown, the conditions are that the gas primarily removes excess binding material between the first pair of rollers and its curing effect is only secondary. and that the gas primarily cures the binding material between the second pair of rollers and its pressure only removes the last of the excess binding material. With this object the pressure of the gas at the first pair of rollers is higher than at the second, and the temperature is conversely lower. For the required density, specific heat and chemical inertness a suitable gas is superheated and dried water vapour. The jets may be applied separately from the rollers and at the end of the process cold jets may be applied. As it issues from the last pair of rollers the moulded product is cut into lengths. e.g. by a circular saw 22. There may be heating and cooling tunnels at the entrance and exit of the machine. The product is intended' for thermal and acoustic insulation.