Process for joining and reinforcing insulating panels

Abstracts of patents Compiled by H. Priestner, Rolls-Royce Ltd

Adhesion of elastomers to fibres Torti, L. and Bertelli, G. UK Patent

Specification, 197O)

1,195,868

(24 June

Efficient adhesion between textile fibres and polymers or terpolymers can be achieved by treating the fibres with a resorcinol-formaldehyde resin in combination with a latex of ethylene-alpha-olefin-polyene terpolymer, chemically modified by introduction of a halogen. Sulphur for vulcanization may be incorporated. Tenacious adhesion under conditions of severe heating due to dynamic stresses is achieved. Tyres, conveyor belts, drive belts are all suitable areas of application.

Monocarbide reinforced eutectic alloys and articles United

Aircraft

UK 1,196,529 (24

Corporation

Patent Specification, June 1970}

Unidirectional solidification of a eutectic alloy, based on nickel, cobalt or chromium, is achieved with a monocarbide of titanium, zirconium, hafnium, vanadium, niobium, or tantalum. The carbide phase is present in the form of high strength fibres, unidirectionally orientated, and embedded in the metallic matrix. These eutectic composites are suitable for use in the high inlet temperature areas of advanced gas turbine engines as they display high strengths over a range of elevated temperatures.

Glass fibre reinforced thermoplastic resin structures Baumann, J. A. and Ingraham, G. E.

UK Patent Specification, 1,197,064 (1 July 1970) The production of laminates suitable for the thermoforming of plastic parts, as used in the automobile industry, is described. Mats of glass fibre are impregnated with resin and bonded sheets of the laminate resin are interleaved with sheets of prepreg. The final laminated sheet is produced by hot pressing. Thermoplastic resins are used, being economic and also having excellent adhesion to glass fibres when thermally degraded. A mouldable supporting element for

reinforcing synthetic resin Process for joining and reinforcing insulating panels Bonnet, A. UK Patent Specification,

1,196,284 (24 June 1970) The construction of heat insulating panels, particularly their jointing, is described for application to trucks and railway cars for the carriage of perishable goods. Glass fibres impregnated with a polyester resin form the bonding material. When two panels are joined in the same plane, an I-shaped element is placed between the panels, before the resin/fibre mix is introduced. Reinforcement of roof and floor for particular types of transport are described.

Pawlicki, H. R. UK Patent Specifica-

tion, 1,197,511 (8July 1970) Rubber articles reinforced with regenerated cellulose fibres Poole, A. G. UK Patent Specification,

1,196,590 {1 July 1970) The bond strength between rubber reinforced with regenerated cellulose fibres is greatly improved by the incorporation of a primary or secondary amino ethyl cellulose or both. Originally the amino ethyl cellulose was added to improve the acid dyeing quality of regenerated cellulose fibres. Applications to tyres and footwear are envisaged.

An improvement in using wire netting as a reinforcement for glass fibre reinforced plastics is given. The glass fibre mats are interwoven with the wire netting, giving a flexible but dimensionally stable element. Boat hulls and other objects with intricate profiles can be more easily manufactured. Lay-up procedures are simplified and deepdrawing chambers are unnecessary. Recessed surface portions on a structure can now be achieved.

Improvements in or relating to the reinforcement of plastics sheets or pipes: improved impact properties Tansley, A. V. UK Patent Specifica-

tion, 1,197,562 (8July 1970) An improved composite building material and its manufacturing method: fibre reinforced cement Toray Engineering Co. Ltd. UK Patent

Specification, 1970)

1,196,301

(24 June

A composite building material is produced from a foamed cement composition, reinforced with glass or asbestos fibres and sandwiched between two plates. The composition is firmly bonded to the plates, which may be piaster boards, veneer boards or synthetic resinous boards. Connecting blocks are placed in the cement-filled cavity to act as spacers. The cement composition is introduced at elevated temperature and pressure.

Polyacrylonitrile production

and

carbon

fibre

Furness, V. I., Marshal, B. W., Baillie, J., Kazesinski, B. and Walker, W. UK

Patent Specification, July 1970)

1,196,599 (1

Carbon fibres with improved tenacity are produced from polyacrylonitrile fibres. The tow of fibres is passed through preheating baths and steam to stretch the tow, after the spinning process. The temperature ranges are given and the tow may be stretched up to 22 times. The spinning solvent used in the preheating baths is an alkali metal thiocyanate. After carbonization, the fibres exhibit greater ultimate tensile strength than standard polyacrylonitrile fibres.

Delamination frequently occurs in p v c sheets or pipes which are clad with a reinforcing layer of resin bonded glass fibres. To improve the impact strength, an adhesive of natural or synthetic elastomer is applied to the PVC in solution in a volatile solvent. The adhesive must remain fiowable between the surface of the pipe or sheet and the reinforcement; neoprene is specifically mentioned.

Improvements in or relating to blades for a gas turbine engine: fabrication of compressor blades and discs Wallett, J. S. UK Patent Specification,

1,197,647 (8July 1970) To produce a disc of compressor blades for a gas turbine engine from

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