| 摘要 |
1,191,902. Foamed plastics laminate. FARBENFABRIKEN BAYER A.G. 4 May, 1967 [11 May, 1966], No. 20789/67. Heading B5N. [Also in Division D1] A process for the production of a foamed plastics article reinforced in at least its marginal zone by a crimped fibre web or webs, the web or webs consisting of smooth or structured monofils, which monofils are crimped and have an individual titre of over 40 denier, at least some of the monofils being synthetic, comprises placing the crimped web or webs in the mould in which the foaming reaction is conducted. The or each web may be made by laying and stitching monofils, may vary in thickness, may be of polyamide monofils, may include natural or synthetic strengthening agents, may also include natural, mineral, metallic, or other synthetic fibres, and may be pretreated with a compound which is capable of reacting with the reaction mixture which produces the plastics foam. The plastics foam may be a polyamide, polyurethane, phenol-formaldehyde, unsaturated polyester, or epoxide resin or P.V.C. The fibre web may reinforce the whole of the volume of the plastics foam in which case it is held in place in a mould or a hollow body by pressure or by a bonding agent whilst the reaction mixture is foamed to fill the mould or hollow body. The reinforced plastics foam may be laminated with or sandwiched between layers of metal, wood, cardboard, paper or plastics. The reinforcement may comprise webs of different densities or thicknesses, and in one embodiment a plastics foam sandwich core is reinforced in its marginal zones by webs of one thickness, and in its central zone by a thicker lighter web. Alternatively the central zone is reinforced only in localized areas. In another example the reinforcement web is thicker than the plastics foam so that it projects on one face thereof. |
