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Agra Plast A S
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Agra Plast A S
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Priority to ES1968152070UpriorityCriticalpatent/ES152070Y/en
Publication of ES152070UpublicationCriticalpatent/ES152070U/en
Application grantedgrantedCritical
Publication of ES152070YpublicationCriticalpatent/ES152070Y/en
Shaping Of Tube Ends By Bending Or Straightening
(AREA)
Abstract
A method to be used in the manufacture of plastic drainage pipes, particularly polyethylene, by which method the tube is provided with holes, characterized in that holes are formed by traversing the walls of said tube by means of heating pins. At a temperature above the softening temperature of the material of the tube, so that projecting collars are formed around said holes. (Machine-translation by Google Translate, not legally binding)
Process for the manufacture of plastic pipes, the wall of which contains fibrous material and granular material in the matrix of cured polymeric material.