| 摘要 |
1,270,688. Moulding plastics such as foamed plastics. BADISCHE ANILIN- & SODAFABRIK A.G. 29 Aug., 1969 [6 Sept., 1968], No. 43051/69. Heading B5A. Continuous lengths of plastics material, in particular foamed plastics material, are made in a moulding apparatus which comprises a chamber having at least two walls of separate panels guided on rails and movable in the direction of delivery of the lengths, and means for carrying out said movement comprising a pusher which engages the upstream panels. As shown, Fig. 2, the chamber comprises segments 6, 6a bolted together, which form the outer side walls, a strip 5 which forms the upper wall, a similar strip forming the lower wall (not shown), and panels 3 which slide against ribs 10 of panels 6, 6a, Fig. 3, and engage guide rails 1, 2. Panels 3 and strips 5 define a space 7 into which starting material is fed, preferably from a plurality of mouths 46 by compressed air. In the embodiment shown, foamed plastics lengths are made by prefoaming the starting material by admission of steam to chamber 7 via orifices 47 in panels 3. Steam pressure is maintained in chambers 8 of segments 6 by sealing strips 23 and (24), Fig. 4 (not shown). The prefoamed material is moved forwardly by panels 3 and is fully foamed by further steam heating, 'the prefoamed material always acting as a buffer between the feed and heating zones. Downstream segments 6a form a cooling zone and comprise serpentine tubes (27), Fig. 7 (not shown), for the delivery of water or cold air. Panels 3 are forwarded by pusher 31, Fig. 2, having a ram 32 and panel engaging means 33. At the downstream end of the apparatus the downstream panels are moved transversely on portions 1a, 2a of rail guide 1, 2 by means of piston and cylinder units 38 to be returned to pusher 31 via rail guides 41, 42 and guide portions 1b 2b, the latter being reciprocated by further piston and cylinder units 38. The emerging length of material may be cut by a cutter which moves longitudinally with the length. |
