SHEET EXTRUSION PLANT

Extruder:

Machine with 65mm / 75mm / 90mm main extruder are offered in combination with one or two 40mm / 50mm co-extruders. The extruders are powered by AC motors with frequency drives. The motor and the extruder gearbox are coupled by V-belt giving in smoother operation. The thrust bearing is located inside the gearbox for best lubrication and heat dissipation. The Control Panel for the entire line is free standing.

Sheet Extrusion

(Click on image for enlarge version)

Screw:

Several different screw designs are offered. The L/D ratio is 1:30 for all screws and 1:32 for vacuum vented barrels for removing volatile constituents of material. Multipurpose screw design for HIPS, ABS and PP is also offered.

Barrel Heaters:

The barrel is heated using ceramic electric band heaters controlled by closed loop temperature controllers.

T-Die:

The die is coat hanger type of die with horizontal split line. It has adjustable and interchangeable lips for different ranges of sheet thickness. Dies have a flexible lip or choker bar. The sheet width can be adjusted on either side by deckling if needed.

Polishing Roller Stack:

The surface of plastic melt leaving the die is smoothened and cooled by rollers on passing through a 3 roll vertical polishing stack. The top and bottom rollers of the polishing stack are pneumatically movable while the center roller is fixed
The surface of roller is hard chrome plated and highly polished to minor finish. The rollers are temperature regulated. The rollers are double-shelled type with spiral circulating channels. All the three rollers have separate temperature control circuits.

Cooling Track:

The Sheet leaving the polishing stack moves on flat cooling track for cooling before entering the takeoff and trimming.

Takeoff and trimming:

After the cooling the sheet is pulled by a set of rubber nip rollers. The polishing Roller stack and take off rollers have independent drives the side edge is trim by a set of circular rotating knives or by fixed knives for thin gauges.

Winder Station / Guillotine

Single or double shaft winder are available as per requirement. For thicker sheets guillotine is provided, with electronic cut-to-length system

Co-extrusion Systems:

Different co-extrusion systems like A-B, B-A, B-A-B, B-A-C are offered. B-A system is generally used for high gloss layer of GPPS on HIPS sheet with main extruder running HIPS.

Technical Data

Note:

Also available sheet extrusion lines with two co-extruders.
Barrel Venting available in all extruders optionally.
Power requirement can vary as per actual system configuration.
T-Dies up to 1500mm width available.
Output depends on material used, screw design offered and actual machine configuration.
Machines suitable for ABS, PP, HDPE also available.