639 PS – Pneumatic expanding shafts with leaves
The Model 639/PS is recommended for unwinding or rewinding rolls with and without cores.
It can be used with multi-slits also for very narrow web widths. The body of the shaft is available in steel and the expansion leaves come in either steel 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 a single inflatable tube that exerts pressure to engage the expandors when air is applied. An exclusive tube protector works to substantially reduce wear and potential tube leakage. Models ordered with journals bigger than 50 mm diameter can be fitted with the SVECOM quick-change air tube, which will allow you to change tubes without removing the shaft from the roll or the machine.
Standard sizes available for this Model are listed below.
Core diameter: from 70 to 500 mm.
Face width: from 600 to 5000 mm.
Expansion range: 8 mm on diameter
Air pressure: min. 5 bar (suggested 6 bar)
Contact SVECOM for Non-Standard requirements.Download pdf file