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1486229 Feeding parisons through a furnace KUREHA KAGAKU KOGYO KK and MITSUITOATSU CHEMICALS Inc 17 Dec 1974 [27 Dec 1973] 54523/74 Heading F4B [Also in Divisions B5 and B8] A tubular parison 26 (e.g. of plastics material) of non-circular internal cross-section, Fig. 4, is mounted on a conveyer in predetermined position relative to receiving means 19 thereon, carried into a hot air furnace, rotated about its tube axis within the furnace, carried out of the furnace and its rotation arrested outside the furnace when in a predetermined orientation. Thereby the parison can then be presented in known orientation to a mould. The conveyer comprises chains 3, 3a with pins 20 therebetween. On the ends of the pins 20 are parison receiving means 19 each comprising a support pin 23, a bed 22 and a sprocket 25. The receiving means 19 has a flat surface 29, Fig. 5, at one side thereof, and this flat surface 29 is brought into predetermined position against a plate 30. A parison 26 is then lowered onto the receiving means 19 and rotated until its non- circular inner surface can pass downwardly over a correspondingly shaped part of the outer portion of the means 19. As the conveyer moves through the furnace, the sprocket 25 engages a chain at the side of the conveyer and is thereby rotated, thus rotating the means 19 and the parison 26. After leaving the furnace, the rotating parison receiving means 19 is stopped in a predetermined orientation by means of a device of the same construction as that shown in Fig. 5. The parison can thus be removed in known orientation for presenting to the mould. The furnace comprises horizontal air inlet ducts (1), Figs. 1 and 2 (not shown), and vertical outlet ducts (2). The conveyer is continuous and takes a sinuous path through the furnace. The parisons are charged to the conveyer at (18), Fig. 2 (not shown), and are oriented relative to the parison receiving means 19 by apparatus illustrated in Fig. 3 (and Figs. 6-13, not shown). Specification 1,402,381 is referred to.
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