AIR SUPPLY RINGS FOR COOLING PLASTIC TUBING

摘要

The apparatus serves for air cooling and provides for an exchange of the internal cooling air through a central opening of the blow head. Air supply rings having outlet slots facing the tubing as well as air-guiding surfaces of small axial length are provided inside the tubing and spaced from the annular die orifice and serve to support the tubing. The cooling air supply rings have axially directed passages for the flow of the cooling air discharged by the lower cooling air supply rings.