Method of producing an internally smooth, externally ribbed tube from extrudable plastic and apparatus for carrying out the method
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United States of America Patent
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Jan 8, 1991
Issued Date -
N/A
app pub date -
Jan 4, 1990
filing date -
Nov 5, 1987
priority date (Note) -
Expired
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Abstract
In the production of plastic tubes or pipes which are internally smooth-walled but have peripheral ribs externally, in particular from extrudable, more especially thermoplastic plastic such as PVC, a good filling of the cavities in the moving mold which are provided to form the ribs, is achieved in that said cavities are filled with the molten plastic first at a distance from the separating plane of the moving mold and last in the region of said separating plane.
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