| 摘要 |
<p>1346660 Moulding articles of fibrous elastomeric material SEMPERIT AG 3 Aug 1971 [5 Aug 1970] 36437/71 Heading B5A [Also in Divisions B7 and C3] In a method of moulding an article, e.g. a tyre, conveyer band or bellows, composed of an elastomeric material in which fibres are embedded, a preform of such material is moulded and then subjected to a treatment causing the fibres in one section to be differently orientated from fibres in another section. In the moulding of a tyre, a tread 12 is positioned in a mould and a web 15 having fibres oriented in the peripheral direction is then located in the mould which comprises a main compartment 7 and auxiliary ring-shaped compartments 5, 6 with pistons 8 and 9. The latter are displaced to force the material in the compartments 5, 6 into the remainder of the compartment 7 causing the fibres forming the tyre sidewalls to be reorientated in the radial direction. The mould core 4 has grooves 18 influencing the flow direction. In a modification the mould has ring- shaped sections at the bead regions rotatable in the peripheral direction causing orientation of fibres in that direction. In a further embodiment the auxiliary compartments are located adjacent the bead regions and the mould core 29, Fig. 6, includes a ring-shaped section 30 with ribs 31 movable in the peripheral direction providing peripherally orientated fibres. Fig. 14 illustrates a mould for the production of a conveyer band with side walls in which a semifinished product 65 with lengthwise orientated fibres is located in a mould cavity and its end portions are compressed by sections 66, 67 and forced into portions 69 causing re-orientation of the fibres into the transverse direction. The elastomeric material may comprise mixtures of natural rubber, styrene-butadiene rubber and polybutadiene rubber. The fibres may be of polyester, rayon, polyamide, glass or metal. By the appropriate design of the tyre mould, e.g. its grooves or ribs, asymmetrical tyres may be produced.</p> |
