| 摘要 |
<p>1312948 Blow-moulding OWENS-ILLINOIS Inc 19 June 1970 [20 June 1969] 29946/70 Heading B5A In an extrusion-blow moulding process, successive portions of a continuously, vertically extruded tube are engaged within a series of vertically reciprocating blow-moulds travelling along separate pairs of guides parallel to the direction of travel of the blow moulds at least one blow-mould travelling downwardly while the tube is inflated therein and while at least one other blow-mould travels upwardly. As shown in Figs. 1, 2, a tubular parison 46 is fed from extruder 30 and engaged by one of blow moulds 44, 46 which moves downwardly therewith while the other blow-mould is open and moves upwardly past it. Blow mould 44 is supported by carrier 60 comprising two plates 100, 102 and slides on rods 68, 70. The mould halves 48, 50 are keyed to rods 84, 86 which are rotated for mould opening or closing through linkage 144 by cam roller 140. Blow mould 46 is similarly supported on carrier 66. Vertical movement of carriers 60, 66 is effected through linkages 112, 114 from cam wheels 108, 110 (see Fig. 3, not shown). Blowing air is supplied to the moulds when descending and closed around the parison through lines 210 via rotating valve 200 (Figs. 7, 8, not shown). Valve 200, cam rollers 140, 142, and cam wheels 108, 110 are all mounted on a common drive shaft 116. The moulds are held closed against blowing pressure by biasing mechanism (Figs. 4, 6, not shown) actuated from cams 314, 316. The moulds have refrigerated cooling ducts (278, Fig. 10, not shown), and an electroformed metallic surface (260) encapsulated, e.g. in a silicone compound (262).</p> |
