4800 mm Paper Machine Printing Writing

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4800 mm Beloit Walmsley Paper Machine: Fourdrinier type, Original year of manufacture 1962 with many rebuilds over the years. Basement design. Drive R/H from flowbox. Last major rebuild was in 1987. Production 85,000 t/year.

Deckle 4800 mm, production 10 to 12 t/hr, at 80 gsm production 12 t/hr, speed 340 to 600 m/min, gsm range 55 to 150. Typical papers produced: offset printing 60 to 150 gsm density 0.75, copy laser papers 80 to 100 gsm and coating base papers 80 to 120 gsm.

Stock Preparation

Celleco cleaners Cleanpac in four stages.

Primary pressure screen Beloit Italia slot CN60, multi blade rotor stainless steel with basket 0.3mm slots , V belt drive.

Secondary screen Voith VS 20 stainless with 0.3 mm slots, V belt drive and plant ref 48-257

Tertiary screen Voith ML10 Minisorter with basket 0.3 mm slots.

Paper machine

Wet end: Valmet Symflow Jetmatic MI ref No 48A – 05, flowbox supplied in the year 1987, with CD basis weight control approx 0.7 gsm. Design speed 1000 m/min., slice width 5100 mm, flow dimensional speed 850 m/min, slice flow 191 l/s/m with an HB internal pressure loss 80 Kpa, max slice flow 229 l/s/m with an HB internal loss of 125 kPa and a minimum slice flow 130 l/s.m with an HB internal pressure loss 40 kPa.

Wire length 33.3 mtrs and width 5300 mm. The wire has a top former by Beloit. Wire length 14.2 mm and 5350 mm wide. Breast roll to Couch centres are 18 mtrs. Pneumatic wire tension control.

Wire frame beams stainless and supports, run out frames etc are m/s and cast iron. Wire frame on top and bottom wire is cantilevered. The wire length 33,223 mm and width 5232 mm. Breast roll and couch roll centres are 14,020mm

Press section:

The press frame is M/S and C.I construction. Some parts of press frames are cantilevered.

Suction pick up transfer press with bottom water cooled roll

Straight through first press after vacuum pick up from pick up with Load 230 pli, The bottom press roll is a suction roll.

Second press plain through type press with load 400pli . This machine does not have an under machine pulper at the wet end and when break occur the paper is rejected onto machine floor by a flat belt conveyor.

Third press is smoothing plain type press with load 130 pli

The sheet moisture after the presses is 55%.

Dryer sections:

Pre dryer section with 32 drying cylinders in four sections, diameter 1524 mm, face width 5189 mm, bolted ends, A/F bearings, central lubrication, cylinder ends bolted internal rotary Johnson siphons with some spreader bars .bolted cylinder ends, design pressure 340 kPa Manual felt stretchers. The cylinder drives are enclosed gear type. The dryer section has an open type hood with sliding doors.

Valmet Metso IQ scanner fed by a Fibron tail feed system, the scanner is measuring moisture and gsm.

Size press:

Inclined pneumatic loaded Puddle type press applying approx 6 gsm of starch. Pick up design.

Impact infrared dryer.

After dryers:

10 drying cylinders, diameter 1524 mm, face width 5189 mm, bolted ends, A/F bearings, central lubrication, cylinder ends bolted internal rotary Johnson siphons with some spreader bars .bolted cylinder ends, design pressure 340 kPa Manual felt stretchers. The cylinder drives are enclosed gear type. Dryer section has an open hood with top sliding doors.

Calender

Four roll calender with three cold nips available, normal use only one or two nips. With Calcoil profile control. Top loading .The calendar has an air feed shute.

From the calendar the tail is fed to reel up via an air chute system.

Metso 2000 year 1988, scanner is measuring ash, moisture, grammage, profile and the colour via QC lab in the machine house.

Hole detector

Horizontal drum reel up for reel diameter 2300 mm, roll accelerator, tape feed by TVSA for roll change over.

Machine drive.

Toshiba manufacture, digital design, sectional drive. DC.

Machine house cranes are:

Eilbeck/ABUS OHTC ,two 20 ton blocks and a Moore OHTC two 30 ton blocks.

The paper machine has had rebuilds:

Digital drive.

After dryer steam pressure increase.

After dryer Infra Red dryer.