Pneumatic expanding shafts with leaves mod. 639 PSC


Pneumatic expanding shaft with leaves model 639 PSC is recommended for unwinding or winding rolls with and without cores.

It can be used with multi-slits even with very narrow web widths. The body of the shaft is available in steel or aluminum, depending on the reel weight and the expansion leaves come in either steel, aluminum or rubber covered depending upon core material and torque requirements. The journal ends are also available in a variety of steels and are always custom-made. Expansion is accomplished by one (or more) air activated pistons that mechanically engage the expandors. Expansion can be spring-activated so as to grant core is gripped also in case of air leakage in the machine. An automatic web clamping device can be fitted for a quicker and easier winding start to customer’s request.

Standard sizes available for this Model are listed below.

Require an estimate


Core diameter: from 70 to 500 mm

Face width: from 800 to 4000 mm

Expansion range: 10/12 mm on diameter

Air pressure: min. 5 bar (suggested 6 bar)


Contact SVECOM for Non-Standard requirements.

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