Effects of operation conditions and die angles on the pressure losses in capillary flow of polystyrene melt

J. Z. Liang; J. S.F. Chan; E. T.T. Wong

doi:10.1016/S0924-0136(01)00731-2

Effects of operation conditions and die angles on the pressure losses in capillary flow of polystyrene melt

J. Z. Liang, J. S.F. Chan, E. T.T. Wong

Hong Kong Metropolitan University

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

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 10² to 10³ 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°.

Original language	English
Pages (from-to)	118-121
Number of pages	4
Journal	Journal of Materials Processing Technology
Volume	114
Issue number	2
DOIs	https://doi.org/10.1016/S0924-0136(01)00731-2
Publication status	Published - 20 Jul 2001

Keywords

Capillary
Extrusion
Melt
Polystyrene
Pressure losses

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10.1016/S0924-0136(01)00731-2

Cite this

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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 102 to 103 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°.",

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AU - Liang, J. Z.

AU - Chan, J. S.F.

AU - Wong, E. T.T.

PY - 2001/7/20

Y1 - 2001/7/20

N2 - 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 102 to 103 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°.

AB - 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 102 to 103 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°.

KW - Capillary

KW - Extrusion

KW - Melt

KW - Polystyrene

KW - Pressure losses

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JO - Journal of Materials Processing Technology

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ER -

Effects of operation conditions and die angles on the pressure losses in capillary flow of polystyrene melt

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Keywords

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