News & Press Releases

NEWS - Acrolab Featured in Tube & Pipe Magazine - Advances in filament winding technology


  November 10, 2009 - Acrolab featured in Tube & Pipe technology Magazine

Cure of thermoset filament wound pipe sections with induction heat
 [As printed in Tube and Pipe Technology Nov 2009 Vol 22 No 6]
A SUPER-THERMAL conductive mandrel technology developed by Acrolab Ltd, Canada, permits curing of filament wound pipe and tube sections by heating the mandrel uniformly, while rotating using an Ambrell induction heating power supply. Induction heating provides clean, precise, even heat. This combination of technologies eliminates the need for cure ovens, saving time and energy.Trademarked the Isomandrel™, the new mandrel design consists of a process internal to the mandrel that enhances its thermal conductivity and thermal reactivity. The process permits heat to be applied in a localised concentration that is then rapidly and homogeneously redistributed over the complete mandrel working surface. Isomandrel technology, when coupled with induction heating, permits the mandrel and filament winding to continue rotating while being heated to an optimum controlled temperature to effect cure. This heating occurs while the assembly is still rotating in the winding machine or on a rotating fixture within the manufacturing cell.
Acrolab Ltd, working with McClean Anderson Inc, USA, and Ameritherm, an Ambrell company of Scottsville New York, as a technology team, constructed the curing cell at McClean Anderson’s laboratory. The induction heated Isomandrel curing station was used to cure a number of 48" long pipe sections wound with glass and carbon fiber epoxy pre-pregs, provided by TCR Composites of Ogden Utah. They were wound on a 3" OD Isomandrel.At the end of the winding cycle, the sections were successfully cured on the Isomandrel using an Ambrell induction heating power supply and coil assembly while the Isomandrel and winding were still mounted and rotating at a reduced 10 RPM on the Super Hornet Winder.By providing high thermal energy uniformly over the entire mandrel surface outward through the filament winding, the cure is completed in a shorter time, with less energy, while providing a significantly more uniform cure and resin rich ID. Ameritherm and McClean Anderson are currently developing a fully software/hardware integrated station to provide the controlled power and recipe requirements to integrate with Acrolab’s Isomandrel™ technology.

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