641 PR - Pneumatic expanding shafts with ledges and rotating body

Model 641/PR is recommended for winding of plastic material that should not be stretched.

It can be used for all types of cores and for multiple rolls. The body of the shaft is available either on light alloy or on steel, and expandors are usually in rubber, to grant the perfect core gripping. The journal ends are also available in a variety of steels and are always custom-made; as they are mounted on roller bearings and connected through a passing bar, they rotate simultaneously and grant therefore a uniform winding. Expansion is obtained by a system of inflatable tubes that are located beneath each row of expandors. Each tube exerts pressure equally to engage the expandors when air is applied. This system results in greater self-centering qualities than other pneumatic shafts presently available. Tube changes are quick and easy, accomplished without journal removal. Hex sockets free both expandors and tube for a quick procedure.

Standard sizes available for this model are listed below.


  • Core diameter: from 50 to 600 mm.
  • Face width: up to 9000 mm.
  • Expansion range: 8 mm on diameter

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