Apparatus for molding articles from fibrous concrete

Apparatus for molding articles from fibrous concrete

different compatible fibre-forming, aqueousbased ceramic precursor liquid. The components may be selected from: titania, aluminachromia (IV) oxide, al...

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different compatible fibre-forming, aqueousbased ceramic precursor liquid. The components may be selected from: titania, aluminachromia (IV) oxide, alumina-silica, thoriasilica (III) oxide, alumina-boria, aluminaboria-silica, or zirconia-silica. Glass fiber reinforced propylene-ethylene copolymer base resin composition Matsuno, Y., Miyamoto, T. and Morita, H. (Nissan Motor Company Limited, Yokohama, Japan) US Pat 4 707 505 (17 November

1987) A glass fibre-reinforced resin suitable as a moulding material for automobile instrument panels comprises 55-77 wt% of a propylene-ethylene block copolymer partially modified by graft polymerization with an unsaturated carboxylic acid; 5-15 wt% of an ethylene-propylene rubber; and 18-30 wt% of glass fibre of 8-15 ~tm filament diameter. The composition is pelletized from the melted state such that the glass fibre dispersed in the resin has a filament length not less than 550 Inn. Fire.resistant wood composites, in particular wallboards, process for manufacture of same and use of a bonding agent in the manufacture Forss, B. (Forss Consult Ky, Kb, Finland) US Pat 4 708 910 (24 November 1987) The fire-resistant composite material comprises wood-chips, -fibre, or -wool, or sawdust bound together by finely-ground hydraulic blast-furnace slag activated by an activator which has an alkaline reaction and water glass. Polymer compositions containing magnetically susceptible filler Ryan, T. G. (Imperial Chemical Industries pie, London, UK) US Pat 4 708 976 (24 November 1987) In new polymer compositions 0.05-5.0wt% of a finely divided magnetically susceptible filler is added to the molten mixture of a polymer which is capable of forming a thermotropic melt which exhibits anisotropic properties and passed through a magnetic field prior to or during the formation of a shaped product.

PROCESSES Method of making leaf spring Epel, J. N. (Southfield), Morse, J. J. (Rochester) and Trebilcock, T. N. (Southgate) (all of MI, USA) US Pat 4 707317 (17 November 1987) The method and apparatus for making a leaf spring from continuous strands of glass fibres impregnated with resin are described. The glass fibres are wound onto a rectangular winding frame which has the means of imparting a bias between its ends. The fibres are then placed in a mould and pressed, under tension, during curing. Composite cord manufacturing method Cousin, J-C, and Robin, J. A. (Cousin Freres, Wervicoq Sud, France) US Pat 4 707 977 (24 November 1987) A method for manufacturing a cord, particularly for tennis rackets, from two thermoplastic materials, one being textile multifilament synthetic yarns and the other being a

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binder, with a softening point lower than that of the first component, each having a weight ration of 45-55% of the total weight is described. The first component is passed through a die and the second component is heated to a semiliquid state and introduced to the yarns under pressure in the die so that the yarns are impregnated before being twisted together, compressed and cooled. Reinforced pistons Day, R. A., Tommis, N. and Baker, A. R. (AE pic, Warwicks, UK) US Pat 4 708 104 (24 November 1987) A method of making a reinforced piston for an engine or a compressor is described. A reinforcement of fibres is prepared which contains a region in which a finely divided particulate material is incorporated. This reinforcement is inserted into a mould which is then filled with molten metal and the whole solidified under pressure. The metal penetrates into both regions of the reinforcement to form a piston comprising two regions with different characteristics. Injection molds for the manufacture of composite bodies Schomblond, J. (Cartier Industrie, Thyez, France) US Pat 4 708 614 (24 November 1987) An apparatus for moulding composite bodies having concentric sections formed from separate mouldable materials is described. The mould contains a bore which is encircled by a cavity. The bore contains two axially aligned opposing members, shaped so that the second cavity is formed between them. Two independent injectors fill each of the cavities with different mouldable material. Apparatus for producing organic fillerblended resin compositions Aoki, K. and Moteki, T. (Chisso Corporation, Osaka, Japan) US Pat 4 708 623 (24 November 1987) An apparatus for receiving and extruding an admixture of a thermoplastic resin and a fibre-rich, roughly-divided organic filler raw material is described. Both parts of the apparatus are elongated cylinders containing screws that are free to rotate within. They are joined by a frustro-conical section, the smaller end joined to the incoming screw and the larger to the outgoing. The incoming section is fed from a section in which the mixture of raw ingredients is plasticized. This, in turn, is fed by a section in which the fibres are disentangled and kneaded. Apparatus for molding articles from fibrous concrete Mkhikian, R. M., Shaginian, S. G., Markarian, T. G., Khaidukov, G. K., Velidzhanian, S. V., Manukian, A. R., Karapetian, A. K., Kazarian, A. V. and Airapetian, R. R. (Nauchno-Issledovatelsky Institut Stroitelstva I Arkhitektury, Erevan, USSR) US Pat 4 708 628 (24 November 1987) The apparatus for moulding articles from concrete containing fibres comprises a tray and a gantry mounted on a frame, free to move above the tray. The gantry holds a concrete placer and a concrete levelling device with a compacting roller behind. The leveller comprises a number of rotatable rod-like spirals of equal pitch and diameter arranged vertically above the length of the compacting roller.

Laminating apparatus for prepreg materials (Taniguchi, A., Ojio, K., Tamamoto, T. and Sana, T. (Kawasaki Jukogyo Kabushiki Kaisha, Kobe, Japan) US Pat 4 708 761 (24 November 1987) A means for multi-laminating different kinds of prepreg material sheets is described. A roll stocker contains a number of rolls ot prepreg material tape on a common axis. The lay-up table is free to move along the stocker in the direction of the common axis and contains a means of cutting the prepreg sheets and a means of compacting them. Metalllzing fiber re-inforeed component Zankl, W. (Dornier GmbH, Friedrichshafen, FRG) US Pat 4 708 778 (24 November 1987) A method of elcctrolytically depositing a metallic layer on a component made from fibre-reinforced material, providing the component contains a hollow or concave portion which is not to be metallized, is described. The concave portion is provided with a wall extension and then sealed off from the rest ot the component which is immersed in the electrolytic bath for metal deposition. Methods of compressively molding articles from resin coated filler materials Bellet, R. J., Broyer, E., Bekker, A. Y. and Lace, M. A. (Amphenol Corporation, Wailingford, CT, USA) US Pat 4 708 839 (24 November 1987) In this method the filler, comprising 60-98 wt% of the material, is in powder form, each individual particle having the resin precipitated onto its surface. The material is placed in the mould and compressed at room temperature at a rate sufficient to achieve an adiabatic increase in temperature to above the Tg of the resin (compression time <1-2 s). The component is then heated, outside the mould, to a temperature equal to the crystallization temperature of the resin for as long as it takes to crystallize the resin. Process for manufacturing a turbine or compressor wheel made of composite material and wheel thus obtained Broquere, B. and Etienne, J. (Societe Europeene de Propulsion, Puteaux, France) US Pat 4 709 457 (1 December 1987) At least two helicoidal textures, each formed by weaving a spiral band with helicoidal warp yarns and weft yarns which are substantially perpendicular to the axis of the texture, are assembled by 'screwing' them in each other and stacking them by mutally approaching their interlaced turns and densified to obtain a preform for a turbine or compressor wheel Apparatus for exposing fibrous reinfaree. ments of fiber reinforced resin body Nishino, Y., Yamamoto, M., Uda, T., Kondo, K., Kondo, T. and Kondo, K. (Hitachi Zosen Corporation, Japan) US Pat 4 709 714 (1 December 1987) An apparatus which will heat a portion of the reinforced resin body; uses a vibrator press for roughly cracking the resin in a resinremoving liquid; uses a second vibrator press with a jet of heated resin-removing liquid so that the resin is finely cracked; has a~a ultrasonic cleaning means for roughly washing off the cracked resin matrix in a heated resin-removing liquid; and applies a shower of heated purified resin-removing liquid to completely wash off the remaining cracked resin matrix is described.

COMPOSITES. JANUARY 1989