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Needling PANOX end caps on PANOX tubes

PANOX end-caps and PANOX tubes were developed and joined together. Initial attempts to needle separately produced parts resulted in a weak joint. After several modifications, a method was develooped where the layers that build up the end caps were directly needled onto the tubes.

Eight to ten cross shaped pieces were cut out of a PANOX felt and laid up on an antistatic foam mandrel (covered with a latex cap) to build up the end-cap. A poly-glycol-ester was used to keep the felt layers closely together. Additionally, a latex cap was pulled over the structure to hold the pieces together. Subsequently the felt pieces were needled directly onto the PANOX tube with a self developed device that pushed a single needle 120 times per minute into the pre-form and moved the needle along the whole end-cap. When the needle had reached the end of the sample, the sample was turned by a motor a little bit. This process was repeated until the whole end-cap was needled.

One advantage of this new method is that the joint between end-cap and tube is much stronger (compared to making end-cap and tube separately and joining both pieces thereafter). A second advantage is that the production time can be significantly reduced. A possible application is the production of PANOX tubes with end-caps.

Reported by

Newmet Composites Ltd. (a division of New Metals and Chemicals Ltd.)
Rue de St. Lawrence Waltham Abbey
EN9 1PF Waltham Abbey
United Kingdom
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