The model 640 / PQL pneumatic expanding shaft is standard in TISSUE industry. The OEMs that supply machines for this market, as well as the top five major fabric manufacturers, all use this model.

Our large diameter steel expandable shafts stay in operation 24 hours a day, 7 days a week in paper mills around the world.

They usually use multiple tube technology with internal and external valves for inflation / deflation.

The 640 / PQL model is the expansion shaft preferred by machine manufacturers for its use in the production of jumbo rolls of paper and tissue on cores.

Dozens or even hundreds of heavy and expensive expandable shafts currently used to wrap, store or transport reels are not needed.

Only from 3 to 6 640 / PQL shafts are needed to run non-stop.

On today’s high-speed paper machines, it is essential to minimize vibrations and unbalance. Our technology can centre the core on the shaft diameter before locking it. The metal centring ledges work in combination with the rubber gripping ledges: the metal ledges are designed to expand first, centring the core on the shaft diameter; subsequently, the rubber ones are raised to block it.

This allows the shafts to work quickly, without hitches or vibrations at higher speeds. All shafts are dynamically balanced up to grade G-1.6.

Each tube has its own internal valve for controlled expansion.

If one chamber fails, the remaining ones, being independent, remain inflated.

The fault is therefore easily identifiable and can be repaired if you have a set of hex wrenches, scissors and a kit of spare parts in just 10-15 minutes.

Very often the paper mills send back shaft for repairs: this is expensive and time-consuming.

The ability to repair our “in-house” shafts, instead of sending them back for maintenance, put the money back in your pocket.

MAIN ADVANTAGES OF SVECOM’S 640 PQL EXPANDING SHAFT

Experience

  • more than 50 years of successful installations in the paper mill and tissue sector
  • Close contact with machine manufacturers

Design

  • Multiple independent air chamber technology for better core centring, grip, use and maintenance
  • Steel body construction, high strength steel alloy journals and resistant urethane tubes
  • Balanced up to grade G-1.6

Performance

  • High speed winding with precise centring of the core
  • from 12 to 24 ledges running the entire length for maximum gripping force
  • Internal fail-safe valves for each air chamber ensuring that the cores are held firmly
  • No need for locking rings or cones that destroy the ends of the cores

Reduced cycle times

  • Reduced inflation and deflation times compared to competitors’ shafts; 10 seconds to inflate / 20 seconds to deflate
  • No locking device to remove when replacing the reels and no spacers are needed to keep the cores aligned
  • Greater space between the core and the shaft for easy insertion thanks to the Svecom centring function

Reduced safety risk

  • Heavy wrenches are not necessary to remove the locking nuts
  • No element can come loose and come off the shaft during winding
  • Strong and safe grip even in emergency stop conditions
  • Less need to use the bridge crane

Saving

  • Very small number of shafts required
  • Significantly increased productivity with non-stop production
  • Reduced maintenance costs