Over the last three years, most of Alcan Packaging’s slitters and printers in the UK have been converted to lightweight Svecom 640/PQL airshafts supplied by Jarshire. With bodies manufactured from aluminium profile with gripping and centring ledges, all the shafts have been under 22 kg in weight - even those for 152 mm ID cores that carry over 1,000 kg in reel weight.
The 640/PQL centring shaft both grips the core and self-centres it to “guarantee” concentric and true running. Equally spaced rows of expanding ledges are set in ‘T’ slots that extend continuously along the length of the shaft's body. These are assembled into the shaft, expanded and then turned on a lathe to a precise expanded diameter based on the client’s core ID specification.
The fully moulded rubber gripping ledges are bonded to a steel backing that protects the bladders from knives and prevents the ledges coming out of the slots under high torque conditions. Bladders under each gripping ledge are inflated simultaneously through a single air valve, raising them to grip the core's internal diameter; then the shaft is deflated, steel spring clips positively retract the ledges below the shaft body surface for sure and easy removal from the core.
Jarshire claims the 640/PQL runs faster, will hold more weight, has greater gripping power, achieves greater expansion and is far easier to repair than any other shaft. Svecom’s multi-bladdered principle is also said to reduce maintenance costs significantly.
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