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Понеділок, 05 травня 2014 00:00

БДМ для производства легковесной печатной бумаги

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№ 5727   
Ширина: 6650 мм. Скорость: 1000 - 1050 м/мин., Производительность: 433 т/сутки. Продукция: 49 - 70 г/м.кв.

БДМ для производства легковесной печатной бумаги.
Ширина: 6650 мм.
Скорость: 1000 - 1050 м/мин.
Продукция: 49 – 70 г/м.кв.
Производительность: 433 т/сутки.
Модернизация: 1983 год. В 1997 году установка новой мокрой части "Valmet"

Расчётная скорость:
Сеточной части - 1400 м/мин
Прессовой части - 1000 м/мин
Сушильной секции - 1000 м/мин
Dryer section - 1000 м/мин
Максимальная скорость привода - 1200 м/мин


Machine is right hand drive from the flowbox with a sectional electric drive.
Grammage range 49 to 70 gsm.  Average running grammages 52 to 55 gsm.
Average production at 54.3 gsm amd machine speed 1013 m/min is 433 t/day.
Machine efficiency approvimately 85%.
Average operational speed 1000 to 1050 m/min.
The machine house has two cranes and one will be retained with the building. DCS Valmet Dematic VME stations rebuilt. Modern heat recovery system. Steam system pressures 10/6/2.5 bars.
Soleplate centres 7850mm and deckle after the rewinder 6650mm.

Approach flow
Metso Deculator                       

LD cleaners in three stages.
Groundwood refiners: two Metso JCO-1 conical refiners.
Kraft pulp refiners: two Voith SDM-1 refiners with 30” diameter discs.
Back water fibre recovery by Nash vacuum assisted by Hedemora disc filter.
Four pressure screens prior to the headbox. Reject pressure screen in basement. Three Voith model GR21 pressure screens year 1983 hole size 1.8 mm and one MODUScreen H3 with by Ahlstrom R with 0.25 mm slotted basket. Reject screen Tampella model 24P.
Machine has a variable speed fan pump.

Wire Section
Flowbox Valmet HHSD 7080 mm slice width, dilution control , auto slice control actuators (total of 117).
Valmet Speedformer: model HSS.
Wire width: 7260mm
Soleplate centres: 7850mm
Dryness after the wire: 19%.

Press Section
Three press sections.
First and second press of Voith manufacture: double press rebuilt 1975.
Third press: Valmet SYMZS.
Dryness after press sections: 49 to 50%
Press maximum loadings: 55 kN/m first press, 100 kN/m second press and 130 kN/m third press.

Dryer Section
The Voith manufactured dryer section in enclosed hood by Voith/Valmet in 1983, with front lifting doors. Total of 60 dryers, all on A/F bearings with auto lub system.
Auto felt guiding and tensioning,  steam and condensate at the rear of the dryers, sheathen rope tail feed, operational pressure 2.5 bar. As indicated the dryer section had a complete rebuild in 1982 where it was totally removed, new bearings fitted, painted, parts repaired and rebuilt, repainted etc.

Calender
The calender has only one roll remaining and is used as a lead roll for the Honeywell moisture spray system. This section has an air transfer system from dryers through to the reel up.
Scanner: Metso IQ measuring gsm, profile, and ash.

Reel Up
Voith horizontal reel up, rebuilt 1983, hydraulic operation, reel spool store above reel up, reel shell accelerator, maximum reel diameter 2000mm.  Reel transfer crane to the rewinder.

Vacuum pumps
Nash 2001, 2001, 6002, 6002, 6002, 6002, 6002, 6002, 6002, 9001 and 9001.

Rewinder
Wartsilla rewinder: seven roll stations, centre reel design, reel shell unwind, design speed 2000 m/min, auto knife setting, tension control, normal finished reel width 2600mm, maximum roll weight 3500 kgs. Deckle after the rewinder 6650mm.

Read 2746 times Last modified on Вівторок, 18 червня 2019 11:59

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