AirCurtainTM for center roll sheet release

AirCurtain will neutralize the pressure difference between the top and bottom sides of the paper. AirCurtain releases the sheet more easily at the center roll and thus creates potential for speed increase.

Main Benefits

  • 10-25% less draw after centre roll01
  • Less sheet breaks and improved runnability
  • Better release control at centre roll
  • Improve sheet strength properties
  • Less porosity
  • Better bonding strength
  • Better tensile strength
  • Better sheet properties after coating
  • Minimize possible re-wetting caused by centre roll lubrication shower
  • Wider sheet at the reel

Air Curtain is quick to install and very easy to operate. An integrated and automated cleaning system keeps the Air Curtain beam clean. Air Curtain can be a part of a press section rebuild where the open draws are minimized. Short open draws have minimal sheet movement and this gives potential for higher Air Curtain pressure.

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Optimized press geometry, Air Curtain and Press Runshooter.

References

Air Curtain has been successfully delivered to over 100 machines globally. Most of the fast running printing paper and linerboard machines with center rolls are using this patented technology. Our customers are for example; APP, Burgo, Domtar, Emin Ledier, International Paper, Mondi, NewPage, Norske Skog, Nippon Paper, Oji, Palm, SCA, Stora Enso and UPM.

Due to confidentiality reasons, the names of the mills are not shown for following cases.

Fine Paper, 1 600 m/min, 55 t/h

air-curtain-case-fine-paper
  • Tri-nip press with shoe
  • Draw from center roll to 1st dryer reduced 4,2 % - 3,55%
  • Due to draw reduction machine speed was increased
  • Less paper defects and sheet breaks

LWC, 1 900 m/min, 50 t/h

air-curtain-case-lwc-1900
  • Tri-nip press with shoe
  • Draw from center roll to 1st dryer reduced 3,09 % - 2,74%
  • Due to draw reduction machine speed was increased
  • Better paper properties before and after coating

LWC, 1 500 m/min, 40 t/h

air-curtain-case-lwc-1500
  • 4-nip press with shoe
  • Draw from center roll to 4th press reduced 2,3 % - 1,6 %
  • Better paper properties before and after coating
  • Less sheet breaks

Newsprint, 1 550 m/min, 33 t/h

air-curtain-case-newsprint
  • Tri-nip press
  • Draw from center roll to 1st dryer reduced 3,8 % - 3,3%
  • Less sheet breaks

Linerboard, 1 400 m/min, 50 t/h

  • Tri-nip press
  • Draw from center roll to 1st dryer reduced 2,75 % - 2,48%
  • Less sheet breaks
 

RunTechnology

Our passion in the paper industry is to create the best productivity and the lowest energy consumption for our customers. Thousands of installations around the globe.

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Contact

Runtech Systems Oy
Kastarintie 27
FI-35990 KOLHO, FINLAND
Tel: +358 3 471 1000
Fax: +358 3 471 1099
Email: runtech (A) runtech.fi
Business ID: 1052834-3

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