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S. Crosta, S-2, 2-Roll Thermobonding Machine, 3600mm, 90000 kg Pressure

Description

  1. Overview
    1. New rolls’ patent
    2. Type: S-2
    3. Diameter bowl 600 mm steel manufacture
    4. Ground bowl surface 3600 mm
    5. Total pneumatic pressure 90,000 kgs
    6. Specific linear pressure load 250 kg/cm
    7. Speed 3-50 m/min
    8. Temperature max 250°C, with primary oil at 280°C
  2. Frame
    1. Welded steel-sheet construction, with covering guards
  3. Rolls
    1. Both upper and lower rolls are driven and mounted on internal axles by oscillating bearings
    2. Rolls are hardened by induction (hardness 50/54 HRC Rockwell), chromium plated and ground with parallel grinding
    3. Lubrication by grease
    4. Each roll is provided with two rotary joints and two flexible hoses with male threads and rotating flange for rolls heated by diathermic oil (oil inlet and outlet on opposite sides)
    5. Both bowls are covered by our new international patent that includes 4 supporting points inside the roll in order to guarantee maximum evenness of pressure and temperature
  4. Pressure Unit
    1. Consists of a pair of pneumatic actuators, connected to the calender’s rollers by means of tie-rods
    2. Machine is provided with a 20 bar air compressor, comprising a 2.3 kW motor, a tank and the necessary instruments for pressure adjustment and control
  5. Drive
    1. The motor drives, by a simultaneous action on the two necks, both bowls, through a belt drive
  6. Transmissions
    1. Two idle transmission rollers, of chromium-plated steel, arranged in the front and rear side of the calender
  7. Solenoid Valves
    1. Devices to reduce automatically the pressure during standstill of the machine in order to prevent any damage to the bowls
  8. Safety
    1. Calender is provided – on both inlet and outlet side – with two safety guards consisting of doors manually sliding along proper guides
    2. Each door is provided with its own limit-switch
    3. The safety system is completely redundant and includes two safety devices with double channel and feedback control, a module for zero speed detection and double contactors for motors
    4. The machine’s emergency circuit is at the maximum safety level according to EN 954-1: category 4
  9. Electric Control Unit
    1. By inverter, protection IP54, running speed adjustable manually from 3 to 50 m/min
    2. Consisting of an a.c. motor power-rate 22 kW
    3. A box complete with pneumatic and electric controls painted in RAL 7035
    4. Voltage 400 V / 50 Hz
  10. Thermic Equipment for Roller Heating
    1. To reach a temperature of 250°C max with diathermic oil at 280°C
    2. Composed of heat exchanger, oil/oil, 200,000 K cal/h
    3. Motor driven pump – for the cylinders’ oil circulation
    4. Tank for collecting and storage of diathermic oil, about 500 L
    5. Expansion tank, about 200 L
  11. Paint
    1. The machine will be painted in green RAL 6011
  12. Not Included
    1. Connections between control box and calender
    2. Diathermic oil plant
    3. Insulation and protection of rotating joints and flexible hoses
    4. Diathermic oil
    5. Positioning and levelling of the machine