Abstracts of patents Compiled by H. Priestner US PA TENTS Glass fibre elastomeric moulding compound and products made therefrom Marzocchi, A. (Owens-Corning Fiberglas Corp) US Patent, 3,538,974 (10
November 19 70} Elastomeric-glass-fibre moulding compounds comprise a continuous phase of elastomeric material and a discontinuous phase of chopped glass fibres, ¼ - 1 ½ in long. The fibres form both fibre bundles and individual fibres, which are uniformly distributed throughout the matrix. The majority of the fibres form the bundles. The moulding compounds may be used for rubber tyres, belting and hose.
Adhesive systems method of bonding reinforcement to rubber and resulting products Yurcick, P. A. and Bills, C. T. (Ashland Oil & Refining Co) US Pat-
ent, 3,538,972 (10 November 1970) A polyester fibre reinforcement is coated in a single-dip process, with an aqueous mixture of rubber latex, phenol sulphide resin and sufficient reactive aldehyde to render the resin thermosetting. After drying, the coated reinforcement is brought into contact with an unvulcanized solid rubber matrix. The resultant composite is subjected to heat and pressure to vulcanize the rubber. Improved adhesion is displayed at high temperature in dynamic stress. Vehicle tyres are the envisaged application.
Method and apparatus for making resin impregnated glass fiber mats Goerden, L., Grunewald, R. and Krosch, J. (Farbenfabriken Bayer Aktiengesellschaft) US Patent,
3,536,549 (27 October 1970) A composite comprising foil/glassfibre/foil mats is made by interposing glass fibres between two distinct foils, which have a surface coating of polyester resin. The composite mat is subjected to compacting, kneading and levelling through a series of roll pair nips. The rolling process can be carried out with a series of roll pairs or with a n u m b e r of rollers pressed against a single large substrate roller.
stantly maintained taut in both planes while being coated with a continuously prepared mix of resin and catalyzer. One film moves horizontally while its coating is partially cured and sequentially covered with layers of resin and material, glass fibres for example. The other film, also with a partially cured coating, is then brought into contact with the layer of fibres. The composite is pressed together and cured to complete the web. The two films are stripped away to leave the fibrereinforced resin sheets.
resin stock is presented. The roving, resin and hardener are all introduced continuously into a composing tube. The composite is cured after leaving the tube, by applying ultrasonic energy at the curing station. The composing tube is shaped according to the desired end-product and is also supplied with spaced pressure jets to ensure good impregnation of the rovings by the resin.
High modulus carbonaceous material and apparatus and methods for mailing the same Gibson, D. W. (Hitco) UK Patent
Specification, 1,217,170 (31 December 1970'1 Glass rovings impregnated with thermoplastic polyurethane resins Hofer, P. H. (Union Carbide Corp) US
Glass rovings, impregnated with thermoplastic polyurethane resins, are characterised by a low-weight hightensile-strength ratio, relatively low elongation, excellent flexibility and excellent abrasion resistance. The composite structure is suitable for use in non-braided, non-woven rope, in aerial antenna systems and buoyant submarine cables. Such cables can be used for antenna systems to transmit and receive radio signals, while the submarine is in deep submergence.
UK PA TENTS Continuous filaments of carbon Rendell, M. (Courtaulds Ltd)
UK 1,217,852 (31
Patent Specification, December 1970'1
This batch process for the production of carbon fibres aims at obtaining specially high Young's modulus values. The precursor is heated in an oxygenenriched atmosphere, wound onto a former, and heated in an inert atmosphere to over 1000°C. The former is removed to permit shrinkage. A further heating step takes the temperature to 2500 C, and is maintained for up to three hours. Continuous carbon fibres result if the final stage is omitted: otherwise the product is graphitized carbon. O
Method of manufacturing composite laminated resinous sheets Simon, A. (Compagnie de SaintGobain) US Patent, 3,536,551 (27
Process and apparatus for continuously forming fibre reinforced resin stock (Glastrusions Inc) UK Patent Specific-
ation, 1,217,559 (31 December 1970J
Two films, as they are individually unwound from supply rolls, are con-
A machine for the continuous production of fibre reinforced plastic
A method is described for the preparation of high modulus carbon fibres. A nonconductive strand is heated to render the fibre conductive. Resistive heating is carried out in an inert atmosphere for a period of up to 10 sec to a temperature of over 2000°C. Simultaneously, the strand is stretched by between 10% and 50%. The strand feed mechanism and furnace of this continuous process are shown.
Carbon filaments: production of carbon filament package Higgins, F. J. (Courtaulds Ltd) UK
Patent Specification, January 1971'1
Precursor fibres of polyacrylonitrile, up to 3 m in length are heated to between 200°C and 300°C in an oxygen-rich atmosphere. The filaments are wrapped in a cloth of carbon fibres to minimize handling damage during the subsequent operations. Bending of the fibre bundle is prevented and the carbonized filaments produced do not have kinks. The entire package is retained for both carbonization and graphitization steps.
Method of producing a fibre assembly Hayward, A. P. St. J. (Rolls-Royce Ltd) UK Patent Specification,
1,218,589 (6January 1971'1 A composite of polyacrylonitrile fibres and epoxy resin is laid up in a mould comprising a series of V-shaped recesses. These recesses assist the fibres in retaining their parallelism. Lengths are laid up until the recesses are filled and continued to produce an outer layer which joins and bridges the recesses. The product comprises a sheet of resin-impregnated fibres with a ridged lower surface, the fibres being parallel to maximize axial strength.
COMPOSITESJune 1971 12]