Method and arrangement for cooling an extruded hollow product
AssigneeUponor Innovation AB
InventorsKari Kirjavainen, Jyri Järvenkylä
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Abstract
The invention relates to a method and an arrangement for cooling an extruded hollow product. According to the invention, the extruder (1) is provided with means for sucking air through the pipe (2). The air to be sucked is thus in contact with the inner surface of the pipe (2), cooling the pipe from the inside. Therefore the cooling of the pipe (2) can be realized in an efficient and simple manner. By arranging the sucking to occur from the middle of the conical extruder (1), no weld line will be formed in the extruded product, and the extruder (1) can be cooled effectively from the inside. According to the invention, the heat contained by the air that has been sucked through the pipe (2) can also be utilized.
Claims20
A method for preparing an extruded hollow product comprising:
- (a) extruding material by feeding the material into an extruder, said extruder comprising at least one stator and at least one rotatable rotor for forcing the material from a supply side of the extruder onto a mandrel at an exit side of the extruder, the mandrel and the at least one stator defining an orifice that gives form to the extruded hollow product;
- and
- (b) sucking air through the extruded hollow product such that the air is sucked through one end of the product, contacts an inner surface of a wall of the product and cools the product and such that the air is then sucked through the extruder from an output end to an opposite second end and reduces a temperature of the extruder sufficiently to mitigate against overheating due to friction of material forced between the rotor and stator.
An apparatus comprising
- (a) an extruder for extruding material, said extruder comprising at least one stator and at least one rotatable rotor for forcing the material from a supply side of the extruder onto a mandrel at an exit side of the extruder, the mandrel and the at least one stator defining an orifice that forms the material into a hollow extruded product comprising a wall with an inner surface;
- and
- (b) blower means for sucking air (i) through the hollow extruded product such that the sucked air contacts the inner surface and cools the product and (ii) through the entire extruder to cool the extruder so as to mitigate against overheating due to friction of material forced between the rotor and stator without sucking air through the wall of the product.
Dependencies are inferred from the claim text.