introduced at 1410 to 1800°C. The fibres are converted to silicon carbide.
Improvements in or relating to the moulding of reinforced cementitious articles (Thyssen (Great Britain) Limited) UK Pat I 417001 (lO Dec 1975) Glass fibres and dry cement are mixed, compacted in a mould, vacuum applied and water admitted. Very fast curing cements can be used giving quick turn-round of moulds. Improvements in or relating to the forming of composite metal wires, rods and bars (AB Garphytte Bruk) UK Pat 1 417 046 (10 Dec 1975) A metal core is surrounded by a tubular sheath of another metal and joined by an explosive bonding process. The assembly may be mechanically worked to form a wire. Manufacture of fibre reinforced members (Siemens Aktiengesellschaft) UK Pat 1 417 084 (10 Dec 1975) Large diameter rods of molybdenum or tungsten alloys are spaced apart, side by side in a mould and surrounded by a nickel based alloy matrix. Hot working causes plastic deformation and substantial reduction in the rod thickness to give a fibrous reinforcement. The product may be used in another matrix and worked to reduce the size further. Polyester synthetic fibre for use as a rubber-reinforcing materials and rubber reinforced thereby (The Yokohama Rubber Co Ltd) UK Pat 1 417347(10Dec 1975) Improved adhesion to rubber results from treating the fibre with an aqueous solution of the reaction product of an excess of resorcinol with an allyl halide and an alkali metal hydroxide to which is added, in turn, formalin and ammonia. After drying a conventional resorcinol-formaldehyde latex is applied. Filament wound vessel and method of manufacture (Hercules Incorporated) UK Pat 1 417 350 (10 Dec 1975) A composite rocket case consists of an outer open ended shell with a predetermined ratio of hoop strength to axial strength and a separate inner shell with a lower ratio of hoop strength to axial strength. The inner shell is slid
into the outer shell open end first. When internal pressure is applied the inner shell expands and develops a frictional bond between the shells.
Process for producing carbon fibres (Japan Exlan Company Limited) UK Pat 1 417494 (lO Dec 1975) High quality fibres are made from any polyacrylonitrile fibre by using a rapid oxidation stage followed by treatment with ultrasonic waves in a liquid medium before the high temperature carbonisation. The intermediate treatment removes pitchy and tarry materials from the preoxidised fibre. Fibre reinforced plastics flat webs (Nitto Boseki Co Ltd) UK Pat 1 417 768 (17Dec 1975) Smooth, strain-free fibre reinforced sheets are made continuously by sandwiching a resin impregnated fibre web between inert plastics films and curing by ionising radiation while applying lengthwise and transverse tension to the films. Improvements in plates of thermoplastics material reinforced with glass fibres and their method of manufacture (Socidtd Chimique des Charbonnages) UK Pat 1 418 512 (24 Dec 1975) Panels containing uniformly dispersed glass fibres with lengths 10 to 100 mm are made by mixing the fibres with the powdered thermoplastic in such a way that the fibres are separated into their elementary filaments. A method and a moulding compound or prepreg for the manufacture of fibre reinforced synthetic resin shaped parts (Resopal Werk H. Rommler GmbH) UK Pat 1 418 642 (24 Dec 1975) Continuous glass fibre rovings are impregnated with thermosetting resin and wound on storage spools. The prepreg is later fed to a screw extruder or injection moulding machine where it is drawn in and shaped with simultaneous diminution of the fibres. Articles of thermoplastic polymers reinforced by glass fibres (Tokuyama Sekisui Kogya Kabushiki Kaisha) UK Pat I 418 753 (24 Dec 1975) A low bulk density glass mat, which is compressible but essentially recovers its shape when the load is removed, is mixed with resin and
moulded under pressure. On heating later to the softening point of the resin under a lower pressure than that used on moulding the mat expands and forms a porous moulding. Making shaped articles from partieu. late material and an anaerobic adhesive (CIBA-GEIGY AG) UK Pat 1 419 800 (31 Dec I975) Foundry moulds and cores can be made very quickly using sand and an anaerobic adhesive of the acrylic ester type. Preferably an oxygen-free atmosphere is maintained with an inert gas. Thermoplastics fdms having fibrous f'daments dispersed therein (Nippon Oil Company Limited) UK Pat 1 419 890 (31 Dec 1975) Plastics paper absorbent to ink is made from a film consisting of a thermoplastics resin containing fibrous filaments by stretching to develop voids round the filaments and applying a solvent to expose a portion of the voids adjacent to the surface. Process for the preparation of impregnated fibre webs (Chemische Industrie Aku-Goodrich BV) UK Pat I 420 429 (7Jan 1976) A fibre web formed on a paper-making machine by the wet method is impregnated with a foamed polymer latex made heat sensitive to cause coagulation at 35 to 65°C, heated and dried.
Production of composite pigments of iron oxide and carbon black (Bayer Aktiengesellschaft) UK Pat 1 420 833 (14 Jan 1976) A continuous, economic, process involves heating a suspension of iron oxide and/or hydroxide to 450 to 850°C with a hot gas laden with carbon black in the presence of an additive to promote bonding between the oxide and carbon. The additive may be high molecular weight organic substances, such as molasses, which are easily thermally decomposed. Calcium sulphate whisker fibres and the method for the manufacture thereof (Franklin Key Inc) UK Pat I 420 866 (14 Jan 1976} Liquid, aqueous mixtures of calcium sulphate dihydrate are heated to 105 to 150°C until calcium sulphate
COMPOSITES. JULY 1976