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ABSTRACT
More than half of pipes are fabricated in thermoplastics and all of them by extrusion, a fabrication process of constant straight cutting. This article is dedicated to the extrusion lines allowing for the implementation of tubes with specific properties and applications. Thus, the reticulation improves the tubes mechanical resistance to high temperatures. The usage of corrugators allows for the production of lighter tubes requiring less matter. The two expansion processes (physical and chemical) produce multilayer pipes with a central alveolar layer essentially used for draining water. The article finally lists the most common extrusion defects along with their causes and remedies.
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Read the articleAUTHOR
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Stéphan PUISSANT: Teacher-researcher, GIP InSIC
INTRODUCTION
After a presentation, in the previous dossier
For example, for installation pipes (distribution of hot or cold water inside buildings), and particularly underfloor heating pipes, cross-linking provides greater mechanical resistance at higher temperatures.
What's more, since the mechanical strength of pipes depends mainly on their external walls, the use of an expanded or corrugated layer (pipe with a corrugated surface) results in a lighter product requiring less raw material.
Finally, the use of coextruded tubes (made up of several layers) makes it possible to combine the qualities of different materials.
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Tube extrusion lines
Cross-linking
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Patents
Infinitely adjustable calibrating shell for continuous extruded plastic parts especially plastic pipes W02004/091891
Calibrating device (Calibration rings with diameter controlled by radial screws) W02004/103684A1
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Pexassociation : http://www.pexassociation.com/
Plastics pipe institute (PPI) : http://www.plasticpipe.org/index.html
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