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Mitsubishi, BOPP Film Line, 1982, 4000 Tons Annual Capacity, 5.5m Film Width, 3 Layers

Description

  1. Overview
    1. Inventory number: E-874
    2. Mitsubishi BOPP film line
    3. 4000 tons annual capacity
    4. 5.5 meter film width
    5. 15-50 micron film thickness
    6. 3 layers
    7. Installed: 1982
    8. The line has been functioning from 1996 until today according to ISO 9001
  2. Condition
    1. Installed in running condition
    2. Pictures available
    3. The line is in good condition and very well maintained
    4. Maintenance has been made by the owner according to the prescription of its producer (MHI Nagoya) on the basis of a yearly maintenance plan
  3. Raw Material Supply
    1. Silo 70 m³ (1), 15 m³ (1), 7 m³ (1), 5 m³ (1)
    2. Roots blast-pipe (3)
    3. Conveyor spiral (4)
    4. Cell-type feeder (6)
    5. Blower (2)
    6. 2 t crane (2)
  4. Extrusion Section
    1. Primary extruder: 200 mm, 33:1 L/D, electrically heated, water cooled, 400 kW drive, heating 8/260 kW
    2. 2 satellite extruders: 65 mm screw diameter, 29:1 L/D ratio, electrically heated, 22 kW drive each, heating 5/24.5 kW
    3. 1 t crane (1)
  5. Filter
    1. Barrel filter, heating 20 kW
  6. Die/Head
    1. 3 layer die head with automatic profile control (robot and heated bolt), 26 kW heating
    2. Breadth of the lips of the die: 800 mm
  7. Caster
    1. Chilled roll: water cooled (3), nip-roll (2), air blade, 3.7 kW drive
    2. 2 t crane (1)
  8. MDO (Machine Direction Orientation)
    1. 8 preheat rolls (Cr-henger, 1’ bar vapour)
    2. 2 chrome stretch rolls (hot water)
    3. 7 nip rolls
    4. Sheet winder, infra-heating, engine 15 kW/7.5 kW
    5. 1 t crane (1)
  9. TDO (Transversal Direction Orientation)
    1. Pre-heating zone (3), stretching zone (3), annealing zone (2), chiller (1)
    2. 22 bar vapour treatment, exchanger, fan, 55 kW drive
    3. Endless series of 874 clips with automatic lubrication
  10. Edge Cutter Unit
    1. Roll of Cr chilled with water (1), edge cutter (1), nip-roll (1), engine 11 kW
    2. Edge grinder (2)
  11. Treatment Unit
    1. Roll in Cr chilled with water (1), rubbered treatment roll (2), nip-roll (2), roll chilled with water (1), engine 11 kW
    2. Corona stations (2), generators (2)
  12. Thickness Meter
    1. For the sheet Sr 90, PP film Pm 147
  13. Winder
    1. Carousel type (A and B)
    2. Tension roll (1)
    3. Winder engine 5.5 kW (2), switch engine 0.75 kW
    4. Max winder reel width: 5500 mm
    5. Max diameter of reels: 680 mm
    6. 3.2 t crane
  14. Slitter
    1. Max mill roll slitting breadth: 5500 mm, Ø 800 mm
    2. Number of slitter arms: 14, 2 of which are for edge cutting/trimming
    3. Max slitting breadth: 1650 mm, min 350 mm
    4. Max Ø 700 mm
    5. Winding on 2 sides, to the same core
    6. Air driven slitter arms with powder clutch and controlled stretching
    7. Unwinder stand with oscillator
    8. Guide rolls (3), final roll (1), furrowed roll (1), 5 mm, contact roll (1)
    9. Winder 18.5 kW
    10. Finish product unloading robot 2.8 t, 3.0 crane, 3.2 t crane
  15. Regranulation Unit
    1. Grinder mounted with fixed and rotating blades, 46.7 kW engine
    2. Flake container provided with cyclon and mixer
    3. Extruder: Ø 200 mm, L/D 29, 200 kW engine
    4. Filter switch horizontal positioned, hydraulically operated
    5. Die Ø 250 mm, Ø 3 mm furat, chiller tank
    6. Provided with guide-roll, continuous water changing, cutting unit, rotating cylindric blade, 7.5 kW engine
    7. RPP tank, 3 m³ provided with supply unit
  16. Process Description
    1. Bidirectional two-phase elongation of flat film
    2. PP granulates get melted, homogenized and formed into a sheet through a broad-gap die
    3. The sheet is transmitted between water-chilled chromate cylinders
    4. In the longitudinal expansion section the film is preheated to the expansion temperature, then expanded in one or two phases with a relatively high expansion speed
    5. The two edges of the film are fixed by an endless series of clips, and the film is introduced into the transversal expansion section
    6. After expansion follow the phases of temperature stabilization, edge trimming, surface treatment winding
    7. The expansion temperature influences the strength and optical properties of the film
    8. The product has longitudinal and transversal mechanic properties that differ; the effect of the transversal expansion is dominant
    9. Theoretically it is possible to expand the film first in transversal and after that in longitudinal direction
  17. Extrusion Line General Features
    1. The basic units are: the extruders, the moulding device, the MDO, the TDO and the winder
    2. The mixture necessary for the production of plain films is melted by the main extruder at 220-260 °C
    3. The temperature is in function of the revolution of the screw, the thickness of the film, and the properties of the raw material
    4. Between the normal transporting limbs of the screw there is installed another blocking limb that regulates the homologous state of the melt, the fluctuations of the temperature and the pressure
    5. The temperature of the extrusion zone is adjusted by a heating-chilling system
    6. The melt passes through the filter and the breaking roll to equilibrate the flux, create counter-pressure, and eliminate external, unmelted or burned parts
    7. The melt then gets to the static mixer that eliminates the radius directed temperature gradient
    8. From the mixer the melt gets to the broad-gap die
    9. For coextrusion-type films, the melt of copolymers necessary to the sealable superficial layers is produced by two coextruders
    10. The scope of the moulding unit is to chill the melt and form a sheet; the melt leaving the broad-gap die passes a gap of air of a few centimetres, after which it is pressed to the surface