Air shafts pneumatic clamping with leafs (LEAF Type)
WISTEC winding shaft for 70 mm cores; 4 aluminium leafs on the circumference
The design of a shaft with clamping shells is characterized by the fact that the clamping force is transmitted by means of shells located on the outside. The continuous leafs made of steel or aluminium expand by a central hose. The clamping force thus acts almost uniformly over the entire inner circumference of 360°. This prevents deformation of the cores, especially with thin walls and narrow partitions.
Profiled clamping shells are used for better power transmission. In this way, even narrow rolls, mounted on one side, can be securely clamped.
WISTEC expansion shaft for 76 mm cores; shells profiled lengthwise
WISTEC shell clamping shaft with hard chrome-plated clamping shells for 100 mm sleeves
A shaft with clamping shells can also be equipped with roller conveyors for loading and unloading.
WISTEC expansion shaft for 3" sleeves with clamping shells and roller conveyor.
WISTEC expansion shaft with shells; design for winding without core
The leaf shaft is the preferred shaft type, which can also be used for coreless winding.
The operating principle is as follows: The web material is inserted into the gap between a gripping lamella under a fixed leaf. When compressed air is applied, the beginning of the web is clamped firmly, while the other leafs expand. When the winding process is finished, the leafs return to their nominal diameter when the shaft is vented. At the same time the web start is released and the reel can be pushed off the shaft.
The following solution has proven to be very useful for clamping very voluminous materials, and with widely varying thicknesses: The beginning of the web is clamped between the expanding clamping shells and a fixed element (bar). Different positions can be selected for the bar.
WISTEC winding shaft, special design for coreless winding of foam webs
The stabilizing element for the clamping rod can be removed with a handle when removing the roll.