Process for the manufacture of composite materials

Process for the manufacture of composite materials

Electrically conductive silicone elastomers Kehrer, G.P. and Smith, W.G. (Dow Coming Corporation, Midland, MI, USA) US Pat 4 279 783 (21 July 1981) An...

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Electrically conductive silicone elastomers Kehrer, G.P. and Smith, W.G. (Dow Coming Corporation, Midland, MI, USA) US Pat 4 279 783 (21 July 1981) An electrically conductive silicone elastomer product is described. The silicone matrix contains 0.3-5.0% by weight of graphite fibres with an average length of 1-6 mm.

Long.lived heavy-duty pavement marking Ethen, J.L.(Minnesota Mining and Manufacturing Company, St Paul, MN, USA) US Pat 4 282 281 (4 August 1981) The material consists of a polymer-based sheet (containing unvulcanized a c r y l o n i t r i t e - b u t a d i e n e ) in which is dispersed particulate fillers and glass microspheres.

The product is a porous body with sound absorbing properties. It consists of sintered irregular-shaped particles of a base material of Al or Al alloy powder and a second material of AI alloy powder (with melting point 10°C lower than that of base material). The body contains an interconnecting network of pores, such as that the pores comprise 33-50% of the total volume of the body.

Composite material compositions using wastepaper and method for producing same Nakajima, Y. (Kabushiki Kaisha Mikuni Seisakusho, Tokyo, Japan) US Pat 4 279 790 (21 July 1981) The composition is produced by mixing and beating 100 parts (by weight) of cut wastepaper (of size les than 30mm) with a molten mixture of 70-150 parts of thermoplastic resin and about 20 parts of rubber.

Composite drum head Muchnick, S.N. (Research Development Systems Incorporated, El Monte, CA, USA) US Pat 4 282 793 (11 August 1981) A membrane structure which comprises an interwoven fabric of polyaramid fibres rigidized with a hardened epoxy resin, and containing micropores, is presented. The manufacture of a drum head and drum from the material is also described.

Composite sheet material Tidmarsh, J.N. and Swift, G.N. (Dycem Limited, Bristol, England) US Pat 4 286 681 (18 August 1981) The sheet material is fabricated by bonding together in sequence a top layer of highlyplaticized PVC; an intermediate barrier of non-foamed polymeric material; and a fibrous backing.

Loaded polyurethane articles MacGregor, C.J. and Parker, R.A. (The Goodyear Tire & Rubber Company, Akron, OH, USA) US Pat 4 279 799 (21 July 1981) A polyurethane composition, containing sufficient milled glass fibres to exhibit anisotropic properties, is described. The anisotropic properties are reduced by the presence of an appropriate amount of mica.

PBT molding compositions containing mica and a composite polymer Charles, J.J. and Gasman, R.C. (GAF Corporation, New York, NY, USA) US Pat 4 283 326 (I1 August 1981) The moulding composition consists 40 wt% poly (C2-C4 alkylene terephthalate), 1-40 wt% phlogophite mica flakes and 5-30 wt% multiphase composite polymer. The latter is made up of an elastomeric phase and a rigid thermoplastic phase which polymerizes in the presence of the elastomer.

Laminated film or sheet structure and process for production thereof Hiraoka, T. and Fujiyoshi, K. (Mitsui Petrochemical Industries Limited, Tokyo, Japan) US Pat 4 279 957 (21 July 1981) The laminated product consists of two adhesively bonded synthetic resin films sandwiched between, and melt-adhered to, two non-oriented synthetic resin layers.

Fiber reinforced plastic members McLain, P.H. (Shakespeare Company, Columbia, SC, USA) US Pat 4 283 446 (11 August 1981) A tubular plastic member of variable diameter, containing longitudinal fibre reinforcing strands in the form of left and right handed helices, is decribed.

Modified polyester compositions Dieck, R.L.(General Electric Company, Pittsfield, MA, USA) US Pat 4 280 948 (28 July 1981) Compositions of a thermoplastic resin are given and a glass fibre-reinforced composite fabricated from the resin is described.

Composite materials with a core and an adhering coating united thereto (Damminger, R, Trulben, Federal Republic of Germany) US Pat 4 283 449 (11 August 1981) The structural material has a low density core of closely folded or crushed metal foil or filaments surrounded by a rigid synthetic resin coat of higher density than the core. The porosity of the core is claimed to result in good bonding with the coating layer.

Fiber-reinforced resin composition containing polypbenylene ether resin Sugio, A., Mash, M. and Matunaga, M. (Mitsubishi Gas Chemical Company Incorporated, Japan) US Pat 4 282 139 (4 August

1981) A fibre-reinforced resin with improved rigidity and dimensional stability is claimed. The resin component contains at least 30% by weight of a polyphenylene ether, the balance being a styrene resin. The reinforcement is chrysotile asbestos fibres, which are used in pellet form, in the amount 10-100 parts by weight per 100 parts of resin. Methods of making an article of bonded material particles (Chase, B.J., Rushforth, R.W.E. and Selman, G.J., Reading, Berkshire, England) US Pat 4 282 174 (4 August 1981) The article contains at least 92.5% by weight of metallic particles (selected from the platinum group metals, gold and silver) and a thermoplastic polymeric material. The process involves mixing particles of the metal and polymer, and moulding the mixture under pressure at elevated temperatures.

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Structural laminate Hipchen. D.E., Skowronski, M.J. and Hagan, J.R. (The Celotex Corporation, Tampa, FL, USA) US Pat 4 284 683 (18 August 1981) The laminate comprises at least one planar facing sheet, a rigid foam and glass fibres distributed evenly throughout the foam. The fibres are arranged in layers, parallel to the facing sheet. Polymer sizing compositions and methods yielding glass fibres having reduced tackiness Fahey, D.M. (PPG Industries Incorporated, Pittsburgh, PA, USA) US Put 4 286 019 (25 August 1981) An aqueous sizing composition for glass fibres is described. The glass fibres treated with the sizing have reduced tackiness but still permit good adhesion with elastomeric materials. Foamable polyester composition Craft, D.I. and Kramer, M. (General Electric Company, Pittsfield, MA, USA) US Pat 4 288 561 (8 September 1981) The composition of a foamable thermoplastic injection mouidable composite is given as a poly (1,4-butylene terephthalate) resin containing 5-50 wt% fibrous glass or mineral and a foaming agent.

PROCESSES Pre-frabricated composite metallic heattransmitting plate unit (Hascoe, N., Larchmont, NY, USA) US Pat 4 283 464 (11 August 1981) A composite metallic plate for transmitting heat from a heat source to a heat-absorbing medium is presented. The plate has a pair of high tensile strength metallic plate members with thermal expansion coefficient approximately the same as the heat source; a plurality of holes extending through the two members; and a layer of relative malleable metallic material between the two members and filling the holes. The second constituent has a heat-transfer coefficient of at least 0.3 Cal/cm2/cm/s/°C. Porous body of aluminlum or its alloy and a manufacturing method thereof Morimto, T., Ohsaki, T., Ohkawa, T. and Matsuzawa, K. (Nippon Dia Clevite Company Limited, Narashino, Japan) US Pat 4 283 465 (11 August 1981)

Mechanical joinder of composite shaft to metallic end members Stanwood, J.W., Clarke, W.A. and Macleane, J. (Ford Aerospace & Communications Corporation, Detroit, MI, USA) US Pat 4 279 275 (21 July 1981) A metal/composite joint is formed between an outer hollow tube made from fibreadhesive composite material and an inner cylindrical metal sleeve with longitudinal parallel grooves. The fibres from the composite material are compacted into the grooves, which have a radius of between 1 and 4 times the radius of the fibres. Process for the manufacture of composite materials Winterbottom, P.H. (Turner & Newall Limited, Manchester, UK) US Pat 4 279 695 (21 July 1981) The process describes the manufacture of a carbon fibre-reinforced composite material. A web of organic fibres (cellulose,

COMPOSITES. JULY 1983

polyethylene or polypropylene) is placed in a slurry of inorganic binder and ball clay, and reinforcing carbon fibres (E < 125 GPa) are added. The finished composite is formed by dewatering the aqueous slurry.

Jointing of concrete structure Tanaka, H. and Tomizawa, C. (Sumitomo Chemical Company Limited, Osaka, Japan) US Pat 4 279 950 (21 July 1981) Concrete structures may be jointed by applying an adhesive of given composition to the base concrete structure and then laying the new concrete on top. The adhesive comprises an emulsion having a glass transition temperature in the range - 5 to +5°C. Method for making resin panels Morse, D.B. (Kemlite Corporation, Joliet, IL, USA) US Pat 4 282 049 (4 August 1981) The production of a glass fibre-reinforced resin panel is described. Manufacture of seamless laminated tubing Dopkin, R.J. and Hochberg, J. (E.I. Du Pont de Nemours and Company, Wilmington, DE, USA) US Pat 4 282 905 (11 August 1981) The tube is formed by placing a tube of chemically inert thermoplastic within a close-fitting seamless fabric sleeve of an inert fibre, heating the tube to soften the plastic, expanding the softened tube by inflation or centrifugal force therby forcing

the polymer between the interstices of the fabric sleeve, and cooling the tube while the polymer is still within the sleeve so that an integral pipe is formed.

Lead coated alumina fiber and lead matrix composites thereof Hartmann, H.S. (E.I. Du Pont de Nemours and Company, Wilmington, DE, USA) US Pat 4 282 922 (11 August 1981) A process for preparing lead-coated alumina fibres is described: the fibres are treated with a solution or dispersion of glass containing ~ 74% lead oxide; the coated fibres are then heated to form an adherent glass film on the fibres; and finally, the glass-coated fibres are treated in a reducing atmosphere at 600-900°C, to convert the lead oxide to metallic lead. The lead matrix composite, formed by placing the lead coated alumina fibres in molten lead and solidifying the mixture, is presented. Phenolic laminates with furan resin coating Mayer, N. and Schuller, L. (Societe chimiques des Charbonnages, Paris, France) US Pat 4 283 462 (11 August 1981) A process for producing a reinforced phenolic resin laminate coated with at least one surface layer of furan resin bonded directly to the phenolic laminate, is described. The furan resin is deposited in the mould, and alternate layers of phenolic resin and fibre reinforcement are laid down when the furan coating begins to harden. After cure, the resulting laminate is claimed to have no surface irregularities due to pitting or fibre projection.

Fiber reinforced ceramics produced without pressing or sin tering us/rig a slurry comprising a silicate and a powdered ceramic Rauch, H.W. (General Electric Company, Philadelphia, PA, USA)US Pat 4 284 664 (18 August 1981) A ceramic composite and its method of manufacture are presented. The composite is formed by adding a fibrous reinforcement to a slurry of an aqueous alkalisilicate and a powdered ceramic, and removing the moisture content by drying. No pressing or sintering is necessary. Reinforchtg member for castable material and process of mixing reinforcing elements with said material Moens, J. (N.V. Bekaert SA, Zwevegem, Belgium) US Pat 4 284 667 (18 August 1981) The process produces a multiplicity of reinforcing elements with said material. Reinforcing member for castable material and process of mixing reinforcing elements with said material Moens, J. (N.V. Bekaert SA, Zwevegem, Belgium) US Pat 4 284 667 (18 August 1981) The process produces a multiplicity of reinforcing members for a castable cementitious matrix material. Steel wires of 0.1-1.0 mm thickness are bundled together, dipped into a bath of hardenable binder, removed from the bath and chopped transversely into pieces with a length: thickness ratio of 50200.

Calendar Event

Time and place

Further details from

Use of

mineral by-products in concrete

31 July-5 August 1983 Quebec, Canada

Mr Molhotra, CANMET, 405 Rochester Street, Ottawa, Ontario K1A 0G 1, Canada

16th National symposium: Fracture mechanics

15-18 August 1983 Columbus, OH, USA

Dr M.G. Kanninen, Battelle Columbus Laboratories, 505 King Avenue, Columbus, OH 43201, USA

4th International conference: 15-19 August 1983 Stockholm, Sweden Mechanical Behaviour of Materials

Conference Secretariat ICM4, Dr N.G. Ohlson, Royal Institute of Technology, Materials Research Center, S-100 44 Stockholm 70, Sweden

International symposium: Rock bolting

September 1983 Lulea, Sweden

Kurssekretariazet, University of Lulea, S-951 87, Lulea, Sweden

Course and Seminar: Fibre composites; design manufacture and performance

6-9 September 1983 Cambridge, UK

Dr P.W.R. Beaumont, Cambridge University, Engineering Department, Trumpington Street, Cambridge CB2 1PZ, England

International conference: 'Testing, Evaluation and Quality Control of Composites'

13-14 September 1983 Guildford, UK

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Fire resistant conveyor belting

13-14 September 1983 Lancaster, UK

G.W. Stockdale, The Plastics and Rubber Institute, 11 Hobart Place, London SWlW OH L, England

2nd International Conference: Composite structures

14-16 September 1983 Paisley, Scotland

Mrs C. MacDonald, Centre for Liaison with Industry and Commerce, Paisley College of Technology, High Street, Paisley, Renfrewshire, Scotland

COMPOSITES . JULY 1983

Tim Feest, Conference Organizer, Butterworth Scientific Ltd Journals Division, PO Box 63, Westbury House, Bury Street, Guildford, Surrey GU2 5BH, UK

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