| 摘要 |
1,254,631. Drying continuous material. GOODYEAR TIRE & RUBBER CO. 9 April, 1969 [15 May, 1968; 16 May, 1968], No. No. 18099/69. Heading F4G. [Also in Division G3] Continuous material, such as tyre cord, is dried by passing it vertically past exposed flame gas fired infra-red heaters and simultaneously directing gas streams on to the material. Webbing 12, Fig. 1, after coating with a latex and resorcinol-formaldehyde-based adhesive 19 in a tank 20 is dried in a tower 14 comprising eight pairs of opposed dryer units 16. Each dryer comprises an infra-red radiant heater 28, 31, Fig. 6, and means for passing a stream of air 42 across the surface of the web 12 to remove evolved water vapour. The heaters are prefer. ably of the type in which a burning gas-air mixture heats a plate to incandescence. The stream of air is produced from a nozzle 50 elongated across the web, deflected against the web by a baffle 54 and exhausted through a duct 58. A mesh screen 64 prevents the stream adversely affecting the burner. Overlapping plates 90 prevent lateral loss of radiation and air from stream 42. A thermocouple 101, sensing the temperature of the web, is used to vary manually or automatically any combination of the following: (a) Fabric speed. (b) The fuel supply or gas-air mixer motor of the burner. (c) The air flow by means of a damper in duct 48 or the speed of the blower fan. Damage to the web by residual infra-red radiation when the web is stopped and the burners shut down is prevented by retracting the burner to the dotted position using an hydraulic and mechanical linkage, and opening the damper to maximize the air flow through nozzle 50. |
