| 摘要 |
1,160,952. Synthetic polymer-elastomeric articles. DUNLOP CO. Ltd. 26 Aug., 1966 [8 Sept., 1965], No. 38446/65. Heading B5B. [Also in Divisions B7 and D1] An elastomeric article such as a pneumatic type carcass is made by shaping a sheet of orientatable fissile material with elastomeric material applied thereto into annular form and supporting it at each side by means of an endless bead wire, the bead wires being disposed in coaxial spaced apart relationship with the sheet spanning them, the sheet gripping the wires or being bonded or welded thereto, and inflating and expanding the sheet so as to orientate the fissile material and at least partially fibrillating the sheet. By "orientatable fissile material" is meant synthetic linear polymers, e.g. polyamides such as nylon and polypropylene, while natural or synthetic rubber or plasticized polyvinyl chloride are examples of elastomeric material. The elastomeric material may be applied in sheet form. The sheet may be expanded by means of an intermediary internally located expansible resilient rubber diaphragm or tube or may be inflated directly. The diaphragm may have different degrees of expansion over parts of its surface so enabling different degrees of orientation in the sheet to be attained. The fissile sheet may be pre-stretched before stretching to an extent less than that required for fibrillation to occur and a plurality of sheets may be used. Heat may be employed in the inflating or pre-stretching operations. Fibrillation of the fissile sheet may take place towards the end of the expansion and may be induced by relatively rotating or rotatably oscillating the bead wires or by reciprocating them towards and away from one another or by a combination of any of these methods or other means of fibrillation, e.g. twisting, rubbing or impacting the sheet, may be used. Alternatively fibrillation may take place in a finally built up article, such as a tyre, when the tyre is expanded into a mould. |
