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BS ISO 11443:2021 – TC

BS ISO 11443:2021 – TC

$246.62

Tracked Changes. Plastics. Determination of the fluidity of plastics using capillary and slit-die rheometers

Published By Publication Date Number of Pages
BSI 2021 94
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This document specifies methods for determining the fluidity of plastics melts subjected to shear stresses at rates and temperatures approximating to those arising in plastics processing. Testing plastics melts in accordance with these methods is of great importance since the fluidity of plastics melts is generally not dependent solely on temperature, but also on other parameters; in particular shear rate and shear stress.

The methods described in this document are useful for determining melt viscosities from 10 Pa?s to 107 Pa?s, depending on the measurement range of the pressure and/or force transducer and the mechanical and physical characteristics of the rheometer. The shear rates occurring in extrusion rheometers range from 1 s?1 to 106 s?1.

Elongational effects at the die entrance cause extrudate swelling at the die exit. Methods for assessing extrudate swelling have also been included.

The rheological techniques described are not limited to the characterization of wall-adhering thermoplastics melts only; for example, thermoplastics exhibiting “slip” effects[ 1][ 2] and thermosetting plastics can be included. However, the methods used for determining the shear rate and shear viscosity are invalid for materials which are not wall-adhering. Nevertheless, this document can be used to characterize the rheological behaviour of such fluids for a given geometry.

PDF Catalog

PDF Pages PDF Title
1 30444331
49 A-30406603
50 undefined
55 Foreword
57 1 Scope
2 Normative references
3 Terms and definitions
60 4 General principles
5 Apparatus
5.1 Test device
5.1.1 General
61 5.1.2 Rheometer barrel
5.1.3 Capillary dies (method A)
65 5.1.4 Slit dies (method B)
5.1.5 Piston
5.2 Temperature control
66 5.3 Measurement of temperature and calibration
5.3.1 Test temperature
5.3.2 Measurement of test temperature
5.3.3 Temperature calibration
5.4 Measurement of pressure and calibration
5.4.1 Test pressure
67 5.4.2 Pressure drop along the length of the slit die
5.4.3 Calibration
5.5 Measurement of the volume flow rate of the sample
6 Sampling
7 Procedure
7.1 Cleaning the test device
68 7.2 Selection of test temperatures
69 7.3 Preparation of samples
7.4 Preheating
7.5 Determination of the maximum permissible test duration
70 7.6 Determination of test pressure at constant volume flow rate: Method 2
7.7 Determination of volume flow rate at constant test pressure: Method 1
7.8 Waiting periods during measurement
7.9 Measurement of extrudate swelling
7.9.1 General
71 7.9.2 Measurement at room temperature
7.9.3 Measurement at the test temperature
8 Expression of results
8.1 Volume flow rate
72 8.2 Apparent shear rate
8.2.1 General
8.2.2 Method A: Capillary dies
8.2.3 Method B: Slit dies
73 8.3 Apparent shear stress
8.3.1 General
8.3.2 Method A: Capillary dies
8.3.3 Method B: Slit dies
8.4 True shear stress
8.4.1 General
74 8.4.2 Bagley correction for capillary dies (method A)
77 8.4.3 Bagley correction for slit dies (method B)
78 8.4.4 Direct determination using slit dies (method B)
8.5 True shear rate
8.5.1 General
79 8.5.2 Method A: Capillary dies
8.5.3 Method B: Slit dies
8.6 Viscosity
8.7 Determination of extrudate swelling
8.7.1 Measurement at room temperature
80 8.7.2 Measurement at the test temperature
9 Precision
81 10 Test report
10.1 General
10.2 Test conditions
82 10.3 Flow characteristics
10.3.1 General
10.3.2 Graphical representation
83 10.3.3 Individual values
10.4 Visual examination
84 Annex A (informative) Method of correcting for the influence of H/B on the apparent shear rate
86 Annex B (informative) Measurement errors
87 Annex C (informative) Uncertainties in the determination of shear viscosity by capillary extrusion rheometry testing
92 Bibliography

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BS ISO 11443:2021 - TC
$246.62