Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/24218
Title: Effects of operation conditions and die angles on the pressure losses in capillary flow of polystyrene melt
Authors: Liang, JZ
Chan, JSF
Wong, ETT
Keywords: Capillary
Extrusion
Melt
Polystyrene
Pressure losses
Issue Date: 2001
Publisher: Elsevier
Source: Journal of materials processing technology, 2001, v. 114, no. 2, p. 118-121 How to cite?
Journal: Journal of materials processing technology 
Abstract: The rheological properties of polystyrene (PS) melt were measured using a constant rate type of capillary rheometer over temperatures varied from 240 to 260°C and shear rates varied from 10 2 to 10 3 s -1. Dies with different entry angles were selected in order to identify the influence of the die angles on the pressure losses during extrusion of the melt. It was found that the end pressure losses increased non-linearly with increasing the piston speeds (V), while the extrusion rate sensitivity of it was insignificant at higher temperature. The total pressure drop (ΔP) in the die extrusion of the melt also increased non-linearly with the increase of V, and decreased with a rise of temperature. In addition, ΔP decreased with increasing the die angle (2α) and showed a minimum value when 2α was about 75°.
URI: http://hdl.handle.net/10397/24218
ISSN: 0924-0136
EISSN: 1873-4774
DOI: 10.1016/S0924-0136(01)00731-2
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