| 摘要 |
1275433 Blow-moulding; heating preforms ROBERT BOSCH GmbH 25 July 1969 [27 July 1968] 37396/69 Heading B5A Blow-moulding apparatus includes an annular holder to receive a preform and at least one nozzle movable relative to the holder and directing heated medium toward the interior wall of the preform to heat it. As shown in the Figure, the holder comprises an annular shaft 20, rotatable in bush 22 of plate 21 by gears 30, 31 and carrying a ring 23 movable between upper and lower positions according to engagement of ball 27 thereof in either notch 28 or 29, respectively. With ring 23 in its lower position, with spring clips 26 released, an injection-moulded preform 11 may be received by the holder with its rim 14 in the annular groove formed by steps 24, 25 in the shaft 20 and ring 23, respectively. The ring 23 is then raised, engaging clips 26, and the shaft 20 with ring 23 and preform 11 is rotated while supplying steam, preferably superheated, through a fixed hollow mandrel 35 extending through shaft 20 into the preform 11 and having slits 39 at its upper end. The base 13 and rim 14 (via ring 23) are cooled by air supplied from nozzles 42, 44, respectively. The preform is then internally dried by hot air from mandrel 35 and the rotation then ceased. After lowering of ring 23 to release spring clips 26, the preform is then gripped by bifurcated fingers 57 pivotally mounted on a reciprocable block 58 of transfer device 55 and placed in blow mould 50. The fingers 57 are removed by movement of block 58 and blowing head 51 lowered. The preform is then stretched by plunger 52 and blown into article 10 by air from line 54.
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