Abstract
This paper is a study on the elongational deformation induced by pins in pin-barrel cold-feed extruders. The mathematical model is established by using simple flow field, plate model, and Newton constitutive relation. It is proved that there is elongational deformation when the fluid bypasses the pin, and the elongational deformation is quantitatively calculated. The finite element method is used to simulate the flow field of the screw mixing section of the pin-barrel cold-feed extruder with different specifications. The velocity vector nephogram in the simulation results is analyzed by numerical analysis of elongational deformation and compared with the theoretical elongational deformation value. The results show that the simulated and theoretical values of elongational deformation are approximately consistent. The numerical analysis of the key factors affecting the elongational deformation shows that the elongational deformation will gradually increase with the increase of screw diameter. For the screw of the same specification, the increasing helical angle will reduce the elongational deformation, and the increasing rotational speed will linearly increase the elongational deformation in unit time. This study can be used to roughly estimate the elongational deformation induced by pins and establish the mixing theoretical model of the pin-barrel cold-feed extruder.
Highlights
Since its birth in 1972, the pin-barrel cold-feed extruder has been paid more and more attention by rubber industry, especially by tire manufacturers
Through simple flow field and geometric simplification, the mathematical model was established to prove and quantitatively calculate the elongational deformation induced by pins
The mathematical model in the theoretical analysis was verified by simulating the flow field in the mixing section, and it was found that the simulated value of elongational deformation was approximately consistent with the theoretical value
Summary
Since its birth in 1972, the pin-barrel cold-feed extruder has been paid more and more attention by rubber industry, especially by tire manufacturers. Yabushita et al used a white compound and a black compound to study the mixing performance of pin barrel extruder with two rows of pins and ordinary cold-feed extruder Their contrastive experimental results showed that the introduction of pins could greatly improve the distribution mixing effect [6]. Shin and White used the flow analysis network method to study the influence of introducing slots in the screw flights and pins on the barrel on the screw pump characteristics. Their analysis results showed that the slots in the screw flights reduced the pumping capacity and the pumping capacity of the two extruders was very close [7]. Brzoskowski et al, through the establishment of kinematic model and the use of flow network analysis method, concluded that the reorientation and elongation of the rubber compounds induced by pin movement were the key factors to obtain good mixing effect [8]
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