Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- en:grafische_darstellung_der_ergebnisse:temperaturverlauf [2024/10/28 20:40] – neelest
+++ en:grafische_darstellung_der_ergebnisse:temperaturverlauf [2025/09/05 10:25] (aktuell) – [Radial temperature profile] neelest
@@ Zeile 1: / Zeile 1: @@
 ======Temperature profile ======
-In the technical analysis of the temperature curve of a screw extruder, the calculated temperatures are plotted at various support points along the length of the screw. These interpolation points represent defined positions along the screw at which calculations are performed.
+-> [[en:berechnungen:temperaturverlauf|To the calculation bases]]
+===== Visualisation of the temperature curve =====
+{{ :grafische_darstellung_der_ergebnisse:rex180_grafisch_en_006.png?nolink&1000 |}}
 =====Interpretation of the curves=====
-  *   ** Red curve**: Melt temperature curve along the length of the screw. This curve shows the calculated temperatures of the material that is melted during the process. The temperature curve is the result of thermal and mechanical influences acting on the material during the rotation of the screw, such as friction, shear and heat transfer from the heated zones of the barrel.
+  * ** Red curve**: The red curve represents the average melt temperature of the melt vortex. It begins with the temperature of the melt film (start temperature), which lies between the melting temperature and the barrel temperature. Typically, the temperature rises continuously, but can theoretically also fall due to correspondingly low barrel temperatures.
-  *   ** Blue curve**: Temperatures of the heating zones along the extruder barrel. This curve shows the temperatures that are set in the individual heating segments of the extruder barrel. These heating zones play a central role in regulating the temperature balance and supporting the melting of the material.
+  * ** Blue curve**: The blue curve represents the progression of the specified [[en:eingabe_der_zylinderdaten:eingabe_der_zylinderdaten|Internal cylinder wall temperature]]. The temperature is interpolated linearly between the specified heating zones.
+Depending on the process, the following additional curves are added:
+  * **Green curve**: In barrier zones, the temperature in the melt and solids channel is considered separately. The red curve corresponds to the temperature in the solids channel and the green curve to the temperature in the melt channel. At the end of the barrier, the temperature curve (in red) follows the end of the temperature curve in the melt channel (green).
+  * **Orange curve**: For shear parts, the temperature above the shear web is also shown. This is always higher than the average temperature and always corresponds at least to the heating zone temperature.
+  * **Purple curve**: For a [[en:eingabe_der_schneckendaten:eingabe_innentemperierter_schnecken|internally tempered screw]], the temperature at the base of the screw is also calculated.
+=====Analysis of the temperature curve=====
+  *     **Temperature curve (red and green curve)**: As a rule, the lowest possible outlet temperature is desirable for an energy-efficient process. The higher the temperature, the sooner and faster thermal damage to the plastic occurs. A greater thermal inhomogeneity can also be assumed. However, a high melting rate is usually accompanied by a high temperature. An optimised process therefore delivers a high melting rate at a low outlet temperature
+  *     **Heating zone temperature (blue curve)**: The cylinder temperatures must be selected so that a high melting rate can be achieved at the lowest possible outlet temperature. The temperature difference between the melt and the barrel should not be too great, especially in the rear part of the screw, as an inhomogeneous temperature distribution can be assumed in this case.
+  *     **Screw base temperature (purple curve)**: With an internally tempered worm, the temperature at the base of the worm is significantly cooler than the mean temperature. The greater the temperature difference between the base of the snail and the mean temperature, the more inhomogeneous the temperature distribution.
-=====Analysing the temperature curve:=====
+====== Radial temperature profile ======
-The visualisation of the temperature curve provides a differentiated view of the thermal conditions in the screw extruder. The two curves (red and blue) provide information on how the melt temperature interacts with the heating zone temperatures and whether the temperature profile along the screw length meets the process requirements.
+Additionally, another side window can be opened using the button in the top right corner. This window displays the radial temperature profile at the corresponding mouse position in the open diagram.
-  *   ** Melt temperature (red curve)**: The progression of the melt temperature along the screw provides information on how the material is thermally processed. Ideally, this curve should rise evenly, especially in the plasticising area where the material is melted. However, excessive heating can lead to thermal damage to the polymer, while insufficient heating slows down the melting process or makes it incomplete.
+{{ :grafische_darstellung_der_ergebnisse:rex180_grafisch_en_016.png?nolink&1000 |}}
-  *   ** Heating zone temperature (blue curve)**: The heating areas along the extruder barrel are divided into several zones, each of which can be controlled individually. The blue curve shows which temperatures are set in the individual zones. These temperatures are not only used to heat the material directly, but also to regulate the heat generated by the mechanical shear. In areas where the melt temperature becomes too high, the heating zones can cool, while in areas with a low temperature they can supply additional heat.
-{{ :grafische_darstellung_der_ergebnisse:rex171_grafisch_en_006.png?nolink |}}
+A "flat" temperature profile (no significant temperature differences in height) indicates good thermal homogeneity. In contrast, large temperature differences in the profile indicate poor thermal homogeneity.
 ===Further topics===
@@ Zeile 27: / Zeile 42: @@
   * [[en:grafische_darstellung_der_ergebnisse:verweilzeit]]
   * [[en:grafische_darstellung_der_ergebnisse:wandschubspannungen]]
-  * [[en:grafische_darstellung_der_ergebnisse:verweilzeitverteilung]]
   * [[en:grafische_darstellung_der_ergebnisse:mischverhalten]]
   * [[en:grafische_darstellung_der_ergebnisse:materialabbau]]
   * [[en:grafische_darstellung_der_ergebnisse:scherdeformationsgradient_und_schergeschwindigkeit]]
   * [[en:grafische_darstellung_der_ergebnisse:schlepp-druckstroemung]]
+  * [[faserlaengenabbau|]]
+  * [[faserlaengenverteilung|]]
+  * [[spannungsanalyse|]]
+  * [[kennlinienfeld|]]
+  * [[entgasung|]]
+  * [[zykluszeit|]]
   * [[en:grafische_darstellung_der_ergebnisse:kurzbericht]]
   * [[en:grafische_darstellung_der_ergebnisse:langbericht]]