berg seminar 13-15 february 2009 runnability technology for paper machine press section and single...
TRANSCRIPT
![Page 1: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/1.jpg)
BERG SEMINAR 13-15 February 2009
RUNNABILITY TECHNOLOGY FOR PAPER MACHINE
PRESS SECTION AND SINGLE FELTED DRYING SECTION
BERG SEMINAR 13-15 February 2009 Jouni Dahllund
![Page 2: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/2.jpg)
BERG SEMINAR 13-15 February 2009
PRESS SECTION AND PRESS TRANSFER
![Page 3: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/3.jpg)
BERG SEMINAR 13-15 February 2009
Problems at press section:
Poor machine/roll geometry too long opened and unsupported sheet draws
Moving surfaces such as felts, fabrics, rolls and the web considerable air flows and pressure differences sheet flutters
High draw breaks, defects, high schrinkage and quality problems
The sheet MD/CD strength ratio varies with an negative effect on runnability in printing.
![Page 4: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/4.jpg)
BERG SEMINAR 13-15 February 2009
EVsp web stabilizer eliminates blowing problems in free-standing presses
Typical problem:Press felt pumps and produces air layer between the web and the press felt. Before the press nip occurs an air bubble causing breaks and defects. Elimination of this phenomenon to be done with excessive draw, uhle box or the web stabilizer.
EVsp eliminates the blowing problem by blowing air out from the press nip and by creating vacuum between the box and press felt vacuum by blowing no mechanical contact to felt (no wear or damages) sheet in contact with the press felt
EVsp does not replace the suction transfer roll, but completes its function. Speed < 800 m/min even without suction transfer roll!!
![Page 5: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/5.jpg)
BERG SEMINAR 13-15 February 2009
EVp web stabilizer supports the sheet from the press to the dryer section
Creates a high vacuum between the box and the dryer fabric.
sheet in contact with the drying fabric less breaks low draw easy tail threading
Lower draw means also that there is less chemical pulp needed and that it is easier to achieve strength requirements.
![Page 6: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/6.jpg)
BERG SEMINAR 13-15 February 2009
SINGLE FELTED SECTIONS
![Page 7: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/7.jpg)
- In the beginning of the drying section, the first single felted groups are very sensitive to runThe web is still very wet and breaks easily
- Without support on web release between top cylinder and bottom roll the wet web tends to follow upper cylinderbreaks and paper defectshigh drawSolution vacuum behind the release
Air flows at web down- and uprun tend to release the web from the fabric breaks, creasing and paper wrinkles caused at upper cylinder nipSolution stabilizer (=vacuum) behind the fabric
PROBLEMS:
![Page 8: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/8.jpg)
BERG SEMINAR 13-15 February 2009
After EVG modification
EVsf web stabilizers
EVp web stabilizer
grade: copy paper, 1000 m/min
References of EV press- and single felted section optimization
![Page 9: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/9.jpg)
BERG SEMINAR 13-15 February 2009
grade: sack paper
EVsf web stabilizersEVsp web stabilizer
References of EV press- and single felted section optimization
![Page 10: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/10.jpg)
BERG SEMINAR 13-15 February 2009
EVsf web stabilizers
EVp web stabilizer
EVsp web stabilizer
grade: cigarette and tipping paper, speed 600 m/min
References of EV press- and single felted section optimization
![Page 11: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/11.jpg)
BERG SEMINAR 13-15 February 2009
For superior runnability and ropeless tail threading
at single felted section
![Page 12: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/12.jpg)
BERG SEMINAR 13-15 February 2009
For superior runnability and ropeless tail threading at single felted section
In EV EasyGo concept EVsf2-V Web Stabilizers are installed on top of the drilled vacuum rolls to support the sheet (stabilizer) and create a vacuum inside of the vacuum roll (suction). This box has two air connections i.e. blow and suction.
Drilling of the cylinders on site without cylinder remove enables minimal downtime.
![Page 13: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/13.jpg)
BERG SEMINAR 13-15 February 2009
Excellent runnability of the drying section
Ropeless tail threading
Additional PM speed
Fewer breaks and less time required for tail threading: Additional production time
Improved paper quality
Drilled holes of the vacuum rolls are big enough to prevent clogging (Ø6…8 mm)
Cost-effective investment, short pay-back time
No fabric contact
Drilling of the cylinders easier and less expensive than exhausting from the cylinder heads: no grooving and change of cylinder heads and bearings mean also
minimized down time
![Page 14: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/14.jpg)
BERG SEMINAR 13-15 February 2009
Burgo Villorba, PM 8 in Italy - LWC, speed 1500 m/min, width 4,5 m
After EV Drying section optimization
3 x EVsf2-V web stabilizers
15 x EVdf web stabilizers
EV Cleaner
References of EV EasyGo concept
![Page 15: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/15.jpg)
BERG SEMINAR 13-15 February 2009
References of EV EasyGo concept
Cartiere Miliani Fabriano, PM 3, Italy, copy paper, speed 1100 m/min, width 4,5 m
After EV Drying section optimization
EVdf web stabilizers EVsf2-V web stabilizers
Ropeless tail feeding with TailBlades
EVdf web stabilizers
![Page 16: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/16.jpg)
NEW TECHNOLOGY
FOR THE FIRST DRYING SECTION GROUPS TO OPTIMIZE WEB
RELEASE BETWEEN UPPER CYLINDER AND VACUUM ROLL
![Page 17: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/17.jpg)
BERG SEMINAR 13-15 February 2009
technology with EVsf3-V Web Stabilizer:
- High release vacuum zone
- Ensures optimal sheet release from upper cylinder
- Eliminates sheet flutter and paper defects
![Page 18: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/18.jpg)
BERG SEMINAR 13-15 February 2009
High release vacuum
Normal vacuum
Normal vacuum
![Page 19: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/19.jpg)
BERG SEMINAR 13-15 February 2009
0.5 0.750000000000003
1 1.50
200
400
600
800
1000
1200
1400
1600
1800
2000
4 mm distance nozzle/fabric 5 mm distance 6 mm distance 8 mm distance
VACUUM WITH DIFFERENT AIR PRESSURE
VA
CU
UM
AT
HIG
H P
RE
SS
UR
E A
RE
A [
Pa]
PRESSURE AT NOZZLE [bar]
Nozzle distance to fabric 4-8 mm
![Page 20: BERG SEMINAR 13-15 February 2009 RUNNABILITY TECHNOLOGY FOR PAPER MACHINE PRESS SECTION AND SINGLE FELTED DRYING SECTION BERG SEMINAR 13-15 February 2009](https://reader038.vdocuments.us/reader038/viewer/2022102900/551c27b15503469e4f8b5e99/html5/thumbnails/20.jpg)
BERG SEMINAR 13-15 February 2009
THANK YOU!