Company founded 1975 US-based machinery business experienced in worldwide sales.

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Davis Standard, Sheet Co-Extrusion Line, 2008, 2290mm, 115mm Extruder

Davis Standard, Sheet Co-Extrusion Line, 2008, 2290mm, 115mm Extruder

Description

  1. Overview
    1. 2290 mm Davis Standard sheet co-extrusion line
    2. 115 mm extruder (2008) with screen changer, melt pump, 2150 mm die head, 2290 mm stack, haul-off cutter
  2. Extruder
    1. 115 mm Davis Standard extruder with 30:1 L/D ratio
    2. Heavily chrome plated barrier screw said to be designed by DS for HDPE and PP
    3. 6 zone electrically heated barrel, air cooled barrel
    4. Heavy duty gear reducer with double reduction helical gears, nominal reduction ratio of 17:1
    5. Rated 298 kW at 100 rpm with a 1.50 service factor
    6. Thrust bearing with a B-10 life of 453,000 hours at 100 rpm and 345 bar
    7. Belted connection of motor to input shaft
    8. Extruder component built October 2008 is virtually unused
  3. Drive Motor
    1. 305 kW DC drive motor, modern laminated frame with fan cooling and tacho speed feedback
    2. 1850/2150/2350 rpm with field weakening (screw rpm max 105/122/134 depending on material)
    3. Year 2000
  4. Screen Changer
    1. Extek 150 mm hydraulically operated lantern slide screen changer with power pack and accumulator
    2. Year 1997
  5. Control Panel
    1. Eurotherm control panel suite housing: main DC motor thyristor unit (with dedicated field weakening module for higher screw speed), gear pump thyristor unit and +20 zone temperature controls (includes 7 die zones) plus melt temp indicator
    2. Integrated pressure instrument panel: prescreen post screen melt pressure
    3. Year 1997
  6. Melt Pump and Mixer
    1. Maag Trudex 90/56 gear pump with Lenze reduction gearbox
    2. 20 kW Lenze DC drive motor at 3150 rpm max giving 110 rpm on gear pump
    3. Static mixer
  7. Coextrusion Block and Die
    1. Coextrusion block with removable co-ex plate, adaptor (a range of coextruders available at extra cost)
    2. 2150 mm EDI Ultraflex sheet die, inclined choke bar flexilip with removable bottom lip
    3. Die gap approximately 6 mm
    4. Die support stand
  8. Operator Controls
    1. Pedestal panel adjacent to roll stack for operator control of rolls open/close, haul-off open/close, centreline height adjustment, retract forward and back
  9. Roll Stack
    1. 2290 mm Sterling 3 roll vertical polishing stack with 3 x 400 mm rolls
    2. 3 individual drives via reduction gearbox and 2.2 kW DC motors with encoder speed feedback giving roll speeds up to 3.7 rpm up to 4.7 m/min
    3. Hydraulic ram top and bottom roll engagement with hydraulic power pack and accumulator
    4. Taper wedge bottom nip gap adjustment
    5. Rotary valves for roll heating/cooling
    6. Roll centre line motorized height adjustment
    7. Retract motor and gear box
    8. Stack mounted upon V groove wheels with rails
  10. Roll Temperature Controllers
    1. 3 off independent roll oil temperature controllers each with multi bank heaters, oil pump and water cooled heat exchangers model HT40
  11. Cooling Conveyor
    1. Cooling conveyor
  12. Haul-Off
    1. 2290 mm Sterling 2 roll haul-off with rubber covered roll
    2. Pneumatic ram roll engagement
    3. Bottom roll driven by 2.2 kW DC drive motor with encoder speed feedback via reduction gearbox
  13. Cooling Conveyor
    1. Cooling conveyor
  14. Cutter
    1. Heavy duty guillotine sheet cutter with motorized conveyor discharge