Extrusion is an effective methold for forming plastic pipes using moveable mold blocks. (RDC 7/30/2009) 

Recent US Patents

9/7/2010
7,789,649
Device for extruding hollow strands

Diekhaus and Schmuhl of Inoex, Germany has developed a device for extruding hollow structures while cooling with a Ranque vortex chamber.  This allows for effective interior cooling is in calibrating devices designed for making a dimensional change while operation is in progress. (RDC 11/27/2010)

 

4/28/2009
7,524,177
Pipe molding system with vacuum and temperature controls of cooling plugs

4/14/2009
7,517,210
Apparatus for the manufacture of compound pipes
7,517,209
Molding apparatus with mold blocks having profiled face adjustment

Recent Journal Articles

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Review Articles

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Editor's Notes

As the literature is reviewed, and items of interest concerning this topic are found. These may be added in an abbreviated form with the reference. Readers and contributors are invited to add their own notes. Contributors may add them directly and other readers can simply send their notes to the editor, Roger Corneliussen at rcorneliussen@4spe.org. He may edit and add them to this page at his discretion.