Spinneret for producing hollow filaments

for bi-component filaments. Two distinct fluid spinning compositions are brought together for extrusion on either side of a knife edge intersectmg each spinning opening, of a multiholed nozzle. T h e distribution system includes a slotted distributor plate with separate radial channels and a conically-shaped insert having alternate inner and outer radial slots in fluid connection with separate feed systems. Glass cord reinforcement of elastomer

articles Shoemaker, P. S. and Kiamp, W. K. (Uniroyal I n c ) U S Patent 3,554,260 ,,~,,,,,,-,,,oT,,~eae.i,;mJin~,io~ or reduction of broken glass cords in pneumatic tyres is accomplished by Using cords with a tensile efficiency-greater than 75% and a twist product within the range of zero to 0.300 turns. Tensile efficiency is a ratio of the in-rubber tensile strength of t h e cord to its theoretical calculated tensile strength.

textile material around the moiald surface. T h e textile may be coated with a binder and the assembly baked sufficiently to coke the binder so as to reinforce and mechanically link the textile material. This has been specifically applied to graphite moulds for high pressure applications.

Composite metal fibre and plastic structures and methods for producing the

(University Patents Inc) US Patent 3/556,914 (19 January 1971) A composite metal fibre structure is described where the metal fibre is anodized, colour coated metal, frequently aluminium. T h e fibres are composite sandwich members having exposed metal on all sides. These are felted and non-metallurgically bonded after which the pores may be filled with plastic to yield a non-porous composite or left to yield a porous plastic bonded skeleton of rigid or flexible sheet.

Spimneret for producing hollow filammts

Moore, M. S. US Patent 3,555,600 (19 January 1971) A spinneret is described for spinning hollow filaments having a m a x i m u m amount of open space in relation to the outside dimensions. Filaments are extruded from a g r o u p of three slots having a dog-leg arran.~ment facing into an adjacent slot. Ftlaments have a sharl~ly defined inner and outer triangular cross section. Application in reinforced laminates, belts and hoses are reported. Process for oxidizing and carbonizing acrylic fibres

H01sten, J. R. and Morrison, J. G. (Monsanto Co) US Patent 3,556,729

Composite retnforeed plastic foam sheet Lemelson, J. H. US Patent 3,556,918

1971) ~ 9 January composite sheet-like

article is described comprising a base sheet of flexible cellular plastic and a body of reinforcing elements secured to one or both surfaces of the sheet. In scouring applications the reinforcement extending, to the surface is secured. T h e c o m p o m e sheet may be formed by welding strips or filamental elements to the surface of the sheet or by co-extruding reinforcement and the plastic base.

(19 January 1971) Acrylic fibre under tension is heated to 230°C in an atmosphere of oxygen and bromine, forming a permeable sheath around the fibre. The fibre is t h e n heated in oxygen above 250°C allowing complete permeation of oxygen through the fibre core. T h e oxidized fibres may be used for fireproof fabrics or further graphitized in an inert atmosphere. This method reduces the pre-oxidation time for the fibres. Composite metal article having nickel alloy having coats containing chromium and aluminlum Berkley, S. G. and Suya~a, F. (United Aircraft Corp) US Patent 3,556,744

(19 Januar),, -1971) A method is described to produce a high temperature resistant composite. An alloy from the group consisting of nickel base, cobalt base and iron base alloys is provided with a chromium coating by a dispersion method and a second chromium-aluminium coating by the same dispersion method. Fibre reinforced hot pressing molds

Ruoff, W. H. (Union Carbide Corp)

US Patent 3,556,893 (19 January 1971) A method for reinforcing a refractory mould by wrapping a carbonaceous

COMPOSITES December 1971

Fibre-resin c o m p ~ t e of polyamide and fibrel

Green, J. R. and Rivers, J. T. (E. I. Du Pont de Nemours and Co) US Patent 3,556,922 (19 Jmnuary 1971) A fibre-resin composite is described consisting of carbocyclic aromatic polyamide fibres and inorganic fibres such as borides, carbides, nitrides and graphites. These composites are useful m compressive applications, Flexural properties of the composites are significantly improved in comparison with composites containing polyamide or inorganic fibres alone.

Composite

bearing

and

process

of

manufacture Lipscomb, W. P. and Schreffer, R. Z. (Allied Chem Corp) US Patent 3,558,202 (26 January 1971) A section of a bearing surface material .formed on a mandrel is wrapped on ~ts outerside with a multi-constituent yarn such as polycaproamide and poly(ethylene terephthalate) which is heated tO produce fusion and shrinkage whereby a composite bearing having the shape of the mandrel is produced.

UK PA TENTS Fibre reinforced composites

Cannell, J. C. and Parratt, N. J.

(Ministry of Aviation Supply) UK 1,236,012 (16

Patent Specification, June 1971)

The manufacture of composites based on an aluminium powder matrix reinforced with up to 20% by weight of alumina fibres or silicon nitride or silicon carbide whiskers. T h e nonductile aluminium matrix yields a composite having high strength and adequate toughness retaining these properues to a marked degree at elevated temperature. Alaminium-steel composite materials

Anderson, E. and Spreadborough, J. (Compagnie Pechiney) UK Patent

Specification, 1,235,973 (16 June 1971) A composite material is described comprising a matrix of aluminium or aluminium alloy reinforced by parallel layers of steel strips. The steel strips are coated with aluminium or aluminium alloy, the longitudinal axes of the steel strips in each layer are mutually parallel. T h e advantage of strip rather than fibre reinforcement is that reinforcement is equally good in both transverse and longitudinal directions. Improved mamnfaeture of composite structural laminates (Woodall Industries Inc) UK Patent

Specification, 1,235,823 (16 June 1971) T h e manufacture is described of a laminated panel comprising a cellular core of foamed plastics material joined to porous sheets impregnated with resin. T h e fibre matting is d!spersed m both the core and resin ~mpregnated layers. This overcomes the normal bonding problems encountered with cellular laminates resulting in a light and structurally strong material. Carbon articles, shaped carbon reticles reinforced with ¢mrbon 61mnents Townsend, B. A. and Morgan, P. E. (Courtaulds Ltd) UK Patent Specification, 1,236,015 (16 June 1971) A process is described for the production of a reinforced shaped article of carbon which comprizes moulding a non-fibrous carbonaceous material, with, if necessary, the addition of a binder. A reinforcement of carbon filaments is used substantially all of which are in the same direction followed by carbonizing the resultant composite material. T h e presence of the filament reinforcement minimizes handling and carbonizing precautions for shaped articles. Carbon filament production Townsend, B. A. (Courtaulds Ltd)

UK Patent Specification, 1,236,018 (16 June 1971) A process for making carbon filaments is described in which organic filamentary material, or similar material previously subjected to heat treatment, is fed continuously through a