VER3827 - 2650 mm Soft calender

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1. Soft calender data
Year of construction: 1998

1.1 Execution of works

The soft calender was designed and made according to the actual E.C. directives and with E.N. standards.
If the standards are not prescribed by those, a German DIN standard is used.
The calender is made of a couple of two cylinders placed one above the other, in which the upper cylinder is fix and the bottom one is hydraulically loaded.

1.2 Frame

The frame is open type, adapted for a quick cylinder change in vertical or axial sense. The cylinders are installed on a united couple of supports

1.3 Cylinder configuration

First nip cylinders seen from web direction:

Superior cylinder: PERITHERM KUSTERS, Ø 610 mm, made in cast iron, ground.
Inferior cylinder: SWIMMING KUSTERS, Ø 423 mm, made in cast iron, dressed in MOL

Second nip cylinders seen from web direction:

Superior cylinder : PERITHERM KUSTERS,Ø 610 mm, made in cast iron, ground.
Inferior cylinder : SWIMMING KUSTERS,Ø 423 mm, made in cast iron, dressed in MOL
The position of superior and inferior cylinder is interchangeable.

Spare rolls available: 1 hard and 1 soft

2. TEHNICAL DATA

2.1 PRODUCTION DATA

Paper grammage: min 60 g/m²; max 150 g/m²
Paper width: approx 2450 mm
Temperature of paper: around 60 C°
Humidity of paper: around 6%
Tension of paper: min 0.3 N/mm; max 0.9 N/mm

2.2Soft calender dates:

Rolls width: 2650 mm
Bearing centre distance: 3450 mm
Linear pressure: min 20 N/mm; max 200 N/mm
Designed speed: 650 m/min
Production speed: 325 m/min

2.3 Temperatures

Outside cast iron chilled cylinder: 160 C°
Outside MOL dressed cylinder: 110 C°

2.4Weights (approximate values)

Total weight of soft calender on its foundations: 34000 kg
Weight on each side: static 17000 daN; dynamic 25500 daN

Cylinders with supports:

PERITHERM KUSTERS: 6800 kg
SWIMMING KUSTERS: 3000 kg

2.5 Electrical consumption

Electrical consumption of calender for every nip: 46 Kw

PERITHERM KUSTERS cylinder: 23 Kw
SWIMMING KUSTERS cylinder: 23 Kw
Sheet guide cylinder: 0.8 Kw
Sheet spread cylinder: 1.6 Kw

2.6 Other electrical consumption

Doctor blades: 4 x 0.18 Kw
Heat exchanger PERITHERM KUSTERS: 2 x 115 Kw
Hydraulic system: 1 x 26 Kw

2.7 Needed voltage and consumptions

Voltage: 380 V
Frequency: 50 Hz
Voltage on control desk: 220 V
Chilling water temperature: 25 C°
Temperature of air: max 35 C°
Temperature of electrical panel: 5 - 40 C°
Humidity in electrical panels: 30 - 90%
Pressure in pneumatic circles: 5,5 bar

Consumption of water for cooling of:
Heat exchanger for PERITHERM KUSTERS: 6,5 m³/h
Oil unit: 3 m³/h
Indipendent lubrication unit
Indipendent hydraulic unit
Electric panel: we can take the parts belonging to the calender, and leave the parts pertinent to the paper machine