| 摘要 |
A tube of thermoplastic synthetic material is formed in automatically continual operations. The leading end of a tubular slab of such material being extruded from an extrusion unit projects into a movably mounted preheater which is pushed thereby at extrusion speed. After the preheater has moved a predetermined distance, the extruded slab is severed and the speed of the preheater is accelerated by connecting it to a drive mechanism to longitudinally separate the severed tube from the extruding slab. The severed tube is now transferred automatically to a socket forming station where the preheated end is thrust into a socket forming device.
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