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ISO 11443-2014 pdf free download
ISO 11443-2014 pdf free download.Plastics — Determination of the fluidity of plastics using capillary and slit-die rheometers
Plastiques — Determination de lafluidité au noyen de rhéomètres équipés d’unefihière capillaire ou plate.
18.104.22.168 To determine the apparent shear rate and the apparent shear stress rap with one capillary die, the ratio L/D of the length L to the diameter D of the capillary die shall be at least 16 and its inlet angle shall be 1800, unless otherwise specified by the referring International Standard. Only data obtained with capillaries of the same inlet angle (±1°). length (±0,025 mm), and diameter (±0,007 mm) shall be compared. The inlet angle is defined In Figure 1.
it is recommended that a die of length either 16 mm or 20 mm, diameter oil mm, and entry angle of 1800 be used (see Note 1). Options for the die diameter of 0,5 mm, 2 mm, or 4 mm are permitted when the recommended value is not appropriate, for example br heavily filled materials. For dies of diameter other than 1 mm, the recommended ratio of length to diameter (LID) shall be the same, where possible, as that of the 1-mm-diameter die used in that instrument.
NOTE 1 Die lengths of 16 mm and 20 mm are most commonly used, the choice often being dependent on, and limited by, the design of the instrument.
NOTE 2 For a given value of the apparent shear rate, the effect olshear heating of the melt is reduced by use of smaller diameter capillary dies.
22.214.171.124 To determine the true shear rate y and the true shear stress r, capillary dies of the same diameter (±0,007 mm) and inlet angle (± 10) and having at least two different LID ratios selected from the recommended series LID = 0,25 to 1, 5, 10, 16. 20, 30, and 40 (see also 8A.2) are required, provided the following conditions are met.
The use of only two dies, of the same diameter (±0,007 mm) and inlet angle (±10), of LID S 5 and LID 16 Is permitted where the test conditions are such that the resultant Bagley plot is not significantly nonlinear, i.e. these conditions having been established in advance for each class of sample, by using additional dies (see UA). When using only two dies, the difference in the LID ratios of the two dies shall be at least 15.
It is recommended that, when using only two dies to determine shear viscosity corrected for entrance pressure drop effects, a short die of length-to-diameter (LID) ratio in the range 0,25 to 1, and a long die of length-to-diameter (LID) ratio in the range 16 to 20. both dies having a diameter of 1 mm and an entry angle of 180°, be used. Options for the die diameter, of 0,5 mm. 2 mm, or 4 mm, shall be permitted when the recommended value of 1 mm is not appropriate, for example for heavily filled materials. For dies of diameter other than 1 mm, the recommended ratios of length to diameter (LID) shall be the same as that specified for the 1-mm-diameter dies.
NOTE The procedure for correction for entrance pressure drop effects (see 8A) is based on an extrapolation of data to a die length of zero, rather than by making the approximation that the short die yields the entrance pressure drop value.ISO 11443-2014 pdf free download.
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