Preliminary study of polymer melt rheological behavior flowing through micro-channels

Chen, S.C.; Tsai, R.; Chien, Rean‐Der; Lin, Tzu-Yang

doi:10.1016/j.icheatmasstransfer.2004.07.004

Cited by 44 publications

(40 citation statements)

References 4 publications

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“…Recent investigations report a series of measurement of melt viscosity within small dimension geometries using high-fluidity amorphous ABS and PS resin [28,29], and high-low density PE, as well as high crystallinity POM resin [30]. From the measured pressure drop obtained from pressure transducers and melt volumetric flow rate, it is possible to calculate the viscosity values.…”

Section: Analysis On the Polymeric Materials And Their Selectionmentioning

confidence: 99%

The Micro Injection Moulding Process for Polymeric Components Manufacturing

Surace¹,

Trotta²,

Bellantone³

et al. 2012

New Technologies - Trends, Innovations and Research

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Section: Analysis On the Polymeric Materials And Their Selectionmentioning

confidence: 99%

The Micro Injection Moulding Process for Polymeric Components Manufacturing

Surace¹,

Trotta²,

Bellantone³

et al. 2012

New Technologies - Trends, Innovations and Research

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“…(1) (2) where " is the shear stress tensor, # · is the shear rate tensor, x, y and z shows the directions. " zz means the shear stress acting on the surface perpendicular to the z axis and showing in z direction.…”

Section: Theoretical Background and Calculationsmentioning

confidence: 99%

“…The most important machine parameters are listed in Table 2. There are some instrumented injection moulds [1][2][3][4][5] but the one developed by us is basically different from them. The material enters in the centreline of the mould from the sprue bush and goes to the parting line.…”

Section: Measuring Systemmentioning

confidence: 99%

“…Many laboratory instruments can be found on the market but only a few of them are suitable for measuring the flow properties of polymeric material in the processing environment. On-line extrusiometers are wide-spread instruments, but injection moulding machines are hardly used for rheological tests [1][2][3][4][5][6]. One of the main goals of our research is to develop a special injection mould which is suitable to determine the rheological properties of polymers at a high deformation rate.…”

Section: Introductionmentioning

confidence: 99%

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Rheological and thermal analysis of the filling stage of injection moulding

Szűcs¹,

Belina²

2012

Express Polym. Lett.

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Abstract.Flow conditions are different in the cavity of the injection mould from the capillary flow of a laboratory rheological instrument. An injection moulding slit die rheometer (Rheo-mould) was designed with a series of slit and orifice dies. Four pressure sensors were built in the stationary side of the mould, therefore the pressure could be measured at four different places. A changeable slit die insert was designed in the moving side. The shear stress and the shear rate can be calculated from the pressure gradient and from the flow rate of the melt, respectively. Flow curves of low density polyethylene were determined using Bagley, Rabinowitsch and Mooney corrections. The results were compared to the flow curves determined by Göttfert and Haake capillary equipments. It was found that the agreement between the methods is excellent.

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“…Based on the measured pressure drop from pressure transducers and melt volumetric flow rate, one can evaluate the viscosity values using a capillary flow model and slit flow model with Rabinowitsch and Walter corrections, respectively. For ABS and PS resin [17][18], it was found that the percentage reduction in viscosity value increases as the micro channel size decreases, when compared with the data obtained from the traditional capillary rheometer. The ratio of the slip velocity to mean velocity was also found to be increased as the decreased size of the micro channels.…”

Section: Introductionmentioning

confidence: 99%

Rheological behaviour of low/high density polyethylene melt flowing through micro-channels

Chen

2008

E-Polymers

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Abstract:The determination of the proper rheological behaviour of the polymer melt within micro structured geometry is vital for accurately simulating the micro moulding. The paucity of suitable equipments is one of main hurdles in the investigation of micro melt rheology. In the present study, a measurement system for the melt viscosity of low and high density polyethylene polymer melts flowing through micro-channels was established. The capillary flow model with Rabinowitsch correction was used in the calculations of the viscosity based on the measured pressure drop and volumetric flow rate. The effect of the morphology structure on the viscosity characteristics for both the LDPE and HDPE resins within micro-channels was investigated and discussed. It was found that the measured viscosity values for LDPE and HDPE in the test ranges are significantly lower (about 40~56% and 22~29% for LDPE and HDPE, respectively, flowing through a channel size of 150μm) than those obtained with a traditional capillary rheometer. Moreover, both the percentage reduction in the viscosity value and the ratio of the slip velocity to the mean velocity increase as the micro-channel size decreases. It can be observed that the rheological behaviours of the HDPE and LDPE resins in microscopic scale are different from those in macroscopic scale as a result of the wall slip effect. It also revealed that the wall slip occurs more easily for the LDPE resin within micro channels than HDPE resin due to enlarged effect of morphology structure.

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Preliminary study of polymer melt rheological behavior flowing through micro-channels

Cited by 44 publications

References 4 publications

The Micro Injection Moulding Process for Polymeric Components Manufacturing

The Micro Injection Moulding Process for Polymeric Components Manufacturing

Rheological and thermal analysis of the filling stage of injection moulding

Rheological behaviour of low/high density polyethylene melt flowing through micro-channels

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