| 摘要 |
1,114,657. Forming articles by winding. VETRERIA ITALIANA BALZARETTI MODIGLIANI S.p.A. 2 Sept., 1966 [8 Sept., 1965; 22 June, 1966], No. 39224/66. Heading B8G. [Also in Division F2] A tubular structure of mineral fibres is made from a straight strip material 14, Fig. 1, that is fed via means S causing one edge of the strip to be elongated with respect to the other edge, the strip being then wound in overlapping helical convolutions on to a tubular mandrel 15 from which it is delivered axially. The material 14 has a thermosetting binding agent dispersed therein, this agent being set by means of heated gas escaping from openings 24, Fig. 7, in the mandrel 15 and permeating the fibrous material. An outer impervious coating strip 21 may be wrapped around the resulting tube and rollers 40, 41 may be used to flatten the stepped surface of the tube. The tubular structure is fed through an oven 31 to a device 18 that rotates in the same direction R as the tube and draws it off the mandrel. The tube is delivered to longitudinal cutting means 26 and transverse cutting means 27. The means S may be frusto-conical guide rollers 16 and 17. |
