An evaluation of the cavity transfer mixer for the extrusion of rigid PVC on both single and twin screw extruders

1987 ◽  
Vol 9 (2) ◽  
pp. 63-66 ◽  
Author(s):  
G. M. Gale
Keyword(s):  
Twin Screw Extruders ◽  
Twin Screw ◽  
Rigid Pvc ◽  
Screw Extruders

scholarly journals The Role of Calender Gap in Barrel and Screw Wear in Counterrotating Twin Screw Extruders

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 990
Author(s):  
Abdullah Demirci ◽  
Ismail Teke ◽  
Nickolas D. Polychronopoulos ◽  
John Vlachopoulos
Keyword(s):  
Large Diameter ◽  
Industrial Sector ◽  
Additional Contribution ◽  
Twin Screw Extruders ◽  
Flow Simulations ◽  
Twin Screw ◽  
Rigid Pvc ◽  
Resultant Forces ◽  
Screw Extruders

It has been known in the industrial sector that in closely intermeshing counterrotating twin screw extruders, large separating forces develop in the calender gap, which push the screws towards the barrel wall. The result is significant wear in the region defined by 30°- and 60°-degree angles from the vertical. In the present investigation, pressures were measured around the barrel in extrusion of two rigid PVC resins in a laboratory extruder of 55 mm diameter and the forces on the screw core were determined. Numerical flow simulations were also carried out using the power-law viscosity parameters of the resins. From the experimental results, it was determined that the resultant forces are in the 30 degree angle direction, and from the computer simulations, the angle is between 18° and 25°. It is argued that the resultant force angle will be somewhat larger in large diameter extruders, due to the additional contribution of gravity.

Investigations on the extrusion of rigid PVC on twin screw extruders

1980 ◽  
Vol 2 (3) ◽  
pp. 174-182
Author(s):  
J. Lutterbeck ◽  
G. Menges ◽  
H. Potente
Keyword(s):  
Twin Screw Extruders ◽  
Twin Screw ◽  
Rigid Pvc ◽  
Screw Extruders

Mechanisms of mixing in single and co-rotating twin screw extruders

1995 ◽  
Vol 35 (17) ◽  
pp. 1325-1338 ◽  
Author(s):  
Adeniyi Lawal ◽  
Dilhan M. Kalyon
Keyword(s):  
Twin Screw Extruders ◽  
Twin Screw ◽  
Screw Extruders
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