Mandrel Connecting

Mandrel Connecting

Summary of the pipe extrusion line

Summary of the pipe extrusion line

In one aspect of the present pipe extrusion line, the disadvantages of the prior art are overcome by providing a pipe extrusion die having a space separating the layer-forming channels. The structure of the pipe extrusion die with this space allows for pipes of more than two layers to be formed that may consist of different materials having different temperature profiles. Having a space between the layer-forming channels allows the added advantage that the individual die assemblies can be moved longitudinally prior to and during manufacture.

In another aspect of the present corrugated pipe extrusion line, there is also provided an extrusion die that allows for adjustment of the die lips from a location near the extrusion head. Adjustment of the die lips at a location near the extrusion head allows for adjustment of individual die layers and for die layers to be modified during manufacture of the pipe.

In a further aspect of the present corrugated pipe production line, there is provided an improved vacuum cooling mandrel that uses a single cooling channel with multiple vacuum ports to provide more control over the structure and appearance of the pipe that is formed.

According to one aspect of the plastic pelletizing line, therefore, there is provided an extrusion die for use in an apparatus to produce multi-layered pipes, the extrusion die comprising: (a) a first and second die assembly, each die assembly comprising: (i) an extrusion head having a central bore and a lateral opening for receiving an extrudate; (ii) a nozzle, operably connected to the extrusion head, the nozzle having an outer die lip at a free end of the nozzle; (iii) a hollow mandrel coaxially located in the central bore, (iv) an inner mandrel coaxially located in the hollow mandrel and in the nozzle, the inner mandrel having an inner die lip at a free end of the inner mandrel; the inner die lip and outer die lip defining a die gap; and, (v) the nozzle and inner mandrel defining a layer-forming channel in fluid communication with the lateral opening and the die gap; wherein a central portion of the nozzle of the second die assembly is co-axially located within the inner mandrel of the first die assembly such that the nozzle of the second die assembly and the inner mandrel of the first die assembly define an air space.

 

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corrugated pipe production line plastic pelletizing line

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