Plastic bottle blowing apparatus

摘要

861,212. Blow-moulding hollow plastic articles. FLAX CORPORATION. May 25, 1959, No. 17807/59. Class 87(2). A plastic bottle &c. is blow-moulded in a machine by first injection-moulding a preform 65 in a blank mould 16 comprising a body mould 19, a neck mould 18 and a core 171, guiding the neck mould and the preform to a movable blow-mould 49, fitting blowing apparatus thereon, blow-moulding the preform, and moving the blow mould through a setting and also an ejection station. Plasticized material is fed by a screw extruder to a chamber 4 through feed line 5, piston rod 12a is advanced to open valve 10b, and the piston 8 raised to inject the material into the blank mould 16, and produce preform 65. The mould halves 19 are then separated by a pneumatically operated toggle mechanism, Fig. 4 (not shown), core 17 raised, and a neck mould supporting arm 46, which is keyed to a vertical shaft 47 rotatably attached to a turret, is lifted by advancing the turret a quarter turn so that a stationary cam 53, Fig. 6, engaged by a roller 52 on arm 50 causes the neck mould to be swung counter clockwise against spring 51 into alignment with a blow-mould 49. The halves of mould 49 are closed on the neck mould 18 and a lower plate 88 by a pneumatically operated rack and piniontoggle mechanism, Fig. 9 (not shown). A blowing apparatus 134 carried by a table on the turret as lowered on to the neck mould by piston 135 and air pressure is applied to line 136 to form a moulded article 65a, Fig. 12. The blow-mould 49 and neck mould 18 are then guided through a setting and an article release station and the cycle is then continued with a set of four moulds 49 and four moulds 18 aligned except at the station S when each mould 18 swings aside to form part of the blank mould 16. The apparatus is automatically controlled by two timers and the turret which is rotated is steps in adjustable elevation. Mould 49 is cooled and core 171, which in one embodiment may be transferred with the preform to the blow mould, may be heated or cooled and is extendable to stretch the preform before blowing and allow air to pass from passage 183.