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Biaxially Oriented PE100 Pipes by Die-Drawing [PE]

 

Taraiya, Ward

# 1998 Gothenburg

Over the last decade Leeds University has developed a continuous die-drawing process to produce thick uniaxially and biaxially oriented polymeric products. Die-drawing offers a simple and effective route to stronger and stiffer polymer products. Biaxially oriented pipes with their improved hoop strength offer particular benefit to the pipe industry, allowing a much higher pressure to be used for any given wall thickness. In previous papersl-10 we have described the die-drawing process to produce biaxially oriented tubes of polyethylene, polypropylene, PVC and PET using a very simple batch process.
Recent work has shown that the mechanical properties of isotropic PElOO can also be improved by die-drawing. Hoop strengths of 32 MPa and even greater can be obtained for material with initial hoop strength in isotropic pipe of 21.5 MPa. Impact strengths also show significant improvement.

The production of biaxially oriented pipe of commercial quality depends on carefully controlling a number of parameters in the drawing process. The most important influences on the pipe quality are these of dimensional accuracy of the feed stock and uniformity of temperature during the drawing operation. Post-mandrel cooling of the drawn pipe allows it to be drawn at higher speeds.

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Related papers

2021 Amsterdam : A NEW GENERATION OF HIGH PERFORMANCE BIAXIALLY ORIENTED POLYETHYLENE AND POLYPROPYLENE PRESSURE PIPES

Author(s) : A. Taraiya, P. Degenhart, M. Soliman, M. Boerakker, R. Handstanger, R. Kleppinger

Since the introduction of polyolefins for pressure pipes, continuous improvements have been made to meet ever-higher demands on their performance and to expand their application window beyond their original scope, mostly based on new resin formulations. Today, we also continue to push the limit to provide better...

2006 Washington DC : Biaxially Oriented PP Pipes

Author(s) : Soliman, Voets, Raven, Kleppinger, Ward

The Leeds die-drawing process has been used to produce biaxially oriented polypropylene pipes with significant enhancement of hoop mechanical properties in terms of tensile modulus and tensile strength due to a unique orientation of the a-crystallites throughout their cross section. Pendulum impact tests and...

1995 Edinburgh : Biaxially Oriented Polymer Tubes by the Die-Drawing Process

Author(s) : Taraiya, Ward

The die-drawing process was developed in this laboratory to produce thick uniaxially or biaxially oriented products.'" Earlier efforts to produce oriented polymer tubes at Leeds University were based on hydrostatic extrusion. Hope et a17 showed that, by using a stationary mandrel and converging die arrangement, round...

1992 Eindhoven : High Strength Oriented HDPE Pipes

Author(s) : Ward, Atkinson, Greig, Hansard

A novel die-drawing process has been developed at Leeds University. By incorporating a mandrel, pipes may be expanded hoopwise whilst being drawn axially. Such biaxially-oriented pipes have properties better suited to the transmission of gases and liquids than either isotropic or longitudinally-drawn pipes. In this...

1992 Eindhoven : The Failure of Long Term Pressure Properties of Plastic Pressure Pipes

Author(s) : Marhsall, Harry, Ward, Pearson

Existing test methods used for the characterisation of long term strength properties of plastic materials for use in pressure pipe duties have been reviewed. A notched "C" ring type test has been developed to define the long term crack resistance and strength properties of a CPE modified PVC. Since materials of this...

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