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III. PLASTICS EXTRUDERS

A. EXTRUDER PSH 125
B. EXTRUDER PSH 90
C. EXTRUDER PSH 63
D. EXTRUDERS: E25; E45; E60; E70; E90; E120
1.Purpose of the extruders - Intended for melting, homogenization and packing of the initial material - polyethylene low and high pressure, polypropylene,PVC. It is a component part of every extruder line - for pipes, flexible tubes, blown foil, profiles,isolation of cables , plastics granulation etc.
2.Description
The Extruders are completed with reducers, import from Italy and billets for cylinders from Germany.The Extruders are equipped with computer control produced in Bulgaria with details of Motorola.
The extruder has the following basic units:
  • Frame - upon it mount the basic units;
  • Cylinder - along with the feeding unit (hopper) has the function to supply the material into the turns of the rotating screw and along with it to do the plasticization and its ejection through the profiling head .The demands are the following: adequate mechanical strength with a view of obtaining high pressures at extrusion; adequate high smoothness upon the inner surface; high wear resistance and corrosion resistance;
  • Screw - mount it in the cylinder and through the shaft of the bearing unit set in motion. The screw surface is grinded and nitrided, which increase considerably the productivity and wear resistance;
  • Reducer - filled with cylindrical gear wheels with sloping teeth. The bodies of PSH-45, PSH-63, PSH-90 have a welded unit, while PSH-125 -cast iron castings, put to aging and free of heat stress. The driving is going on with direct-current motor, which through belt drive operate the reducer. On its part it sets in rotating motion the screw;
  • Electric equipment - intended for control the revolutions of the electric motor and thermoregulation the heating of the cylinder;
  • Cooling system - intended for cooling the cylinder and the screw. The press is air and water-cooled. The cooling of the cylinder is going on through ventilators, which push in the air into casings around the cylinder. The cooling of the screw and the cylinder in the feeding zone is going on through water. Our machines have a water cooling only in the feeding zone.For the rest zones we use precise thermoregulators of the Japanese company OMRON,which ensure accuracy 0.5 degrees.
  • Heating system - intended for heating of the cylinder .The heaters are grouped in heating zones;
  • Electric motor - intended for driving of the extruder. Use direct-current motor with a view to lightly control of the revolutions in wide range.
3.Working of the extruder
The mounted electric motor with adjustable revolutions through belt drive operate the reducer, which on its part sets in rotating motion the screw. The initial material feed into the hopper and from there in the power zone of the screw. Through the rotating motion of the screw the material is pushed out to the forming instrument through which come out elasticized. The plasticization of the material go on at the expense of the thermal separation, as a result of the transformation of the mechanical energy into thermal and extra quantity of heat from the heaters on the cylinder. Conditionally the cylinder and the screw in the direction of the material movement divide into 3 technological zones: feeding zone -intended for taking of the initial material; homogenizing -where take place the plasticization of the material and the transformation of the mechanical energy into thermal; injection -where the plasticized material injects with high pressure into the forming instrument.
A. EXTRUDER PSH 125
Description
Intended for melting, homogenization and concentrating of initial material. It is completed with reducer and DC motor with thyristor control. The screw and cylinder are made of high quality nitrided steel, wear-resisting.

Specifications
3NOMINAL SCREW DIAMETER /D/ 4". 92
EFFECTIVE SCREW LENGTH 25D
CONTROL THE SCREW REVOLUTIONS lightly from 10 to 100 rev/min
CONTROL RANGE OF TEMPERATURE 50 C to 450 C ( +/- 0.5 C )
HEATING ZONES OF THE CYLINDER 5
ELECTRIC DRIVE 140 hp
HEATING POWER OF THE CYLINDER 30 kW
COOLING OF THE CYLINDER IN THE FEEDING ZONE water
COOLING OF THE REST ZONES air
CAPACITY 250-300 kg/h
REGULATION OF THE SCREW REVOLUTIONS lightly,through el.motor with thyristor control

B.EXTRUDER PSH 90
Description
Intended for melting, homogenization and concentrating of initial material. It is completed with reducer and DC motor with thyristor control. The screw and cylinder are made of high quality nitrided steel, wear-resisting.
Extruder PSH90 Specifications
NOMINAL SCREW DIAMETER /D/ 3".54
EFFECTIVE SCREW LENGHT D 25
CONTROL THE SCREW REVOLUTIONS lightly from 10 to 100 rev/min
CONTROL RANGE OF THE TEMPERATURE 50 C to 450 C
( +/- 0.5 C )
HEATING ZONES OF THE CYLINDER 4
ELECTRIC DRIVE 75 hp
HEATING POWER 25 kW
C.EXTRUDER PSH 63
Specifications


NOMINAL SCREW DIAMETER /D/ 2".48
EFFECTIVE SCREW LENGHT D 25
CONTROL THE SCREW REVOLUTIONS lightly from 10 to 100 rev/min.
CONTROL RANGE OF THE TEMPERATURE 50 C to 450 C
( +/- 0.5 C )
HEATING ZONES OF THE CYLINDER 4
COOLING OF THE CYLINDER forced, air
ELECTRIC DRIVE 50 hp
HEATING POWER 13 kW

D.EXTRUDERS : E25; E45; E60; E70; E90; E120 (Type Exx)
Extruder E70
Specifications
TYPE E25 E45 E60 E70 E90 E120
Parameters
SCREW DIAMETER / IN/ 1" 1".77 2".36 2".75 3".54 4".72
CAPACITY OF THE EL. MOTOR/KW/ 3.7 11 15/ 22 22/ 30 37 70
HEATING ZONES 2 3 4 4 5 6
HEATING CAPACITY /KW/ 22 6 8 9 16 30
Extruders type Exx
The extruders' types Exx are intended for plasticization of thermoplastics. With the extruders Exx are completed all types extruder lines -for production of foil -sleeve and plane, for the production of plates and sections, pipes, hoses and flexible tubes, lines for the production of threads and cord, cable lines etc.
Operation
It is accomplished through direct -current motor with thyristor control, which allows lightly regulation of the screw revolutions and selection of optimal technological rate. The extruders are completed with reducers, import from Italy and billets for cylinders from Germany.
Cylinder and screw
Produced of high -quality alloyed steel according to the modern technology. The hardness of the cylinder (on the inner diameter) is guaranteed within the framework of 65-68 Hrc that presumes from 3 to 5 times longer life in comparison with the cylinders, which are produced according to the standard technology. The processing of different types thermoplastic materials presumes use of screws with different geometry and length. We offer optimal versions depending on the processed material.
Electric control
The electric control of the extruders is situated in separate electric cabinet. Depending on the customer's request we offer and taken out control panel. The electric control includes:
  • thyristor control of the basic motor
  • thermoregulation
Each heating zone has a thermoregulators type VEMA. It allows self-optimization the parameters of the object for regulation and possibility for lightly reach of the assigned temperature.
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Contact us:
9 Zlatovrah Str.
1164 Sofia, BULGARIA
Tel./Fax (+359 2) 870 3295
Mobile (+359 896) 872 859
E-mail: ktomov@usa.com

http://www.desislava20granulators.com