======Tribological data======

===== Material data - Tribology=====

The tribological data (coefficients of friction) of the material are entered in the ‘Tribology’ tab. The input is optional and is only required for the calculation of [[en:berechnungen:nutbuchsenberechnung|Grooved bushings]].
  * **Barrel friction coefficient** $\mu_z$: Coefficient of friction between the plastic and the barrel
  * **Screw friction coefficient** $\mu_s$: Coefficient of friction between the plastic and the screw
  * **Friction coefficient at melt film formation** $\mu_{z1}$: Coefficient of friction when changing from solid friction to melt film friction (only required for [[en:berechnungen:nutbuchsenberechnung|limited speed orientated grooved bushing calculation]]). This value is difficult to determine. Calibration based on known grooved bushing processes is recommended.
  * **Internal coefficient of friction** $\mu_i$: Coefficient of friction between the granules

{{ :materialdaten:rex180_mat_en_006.png?nolink |}}

However, determining the necessary friction coefficients is problematic and error-prone.

===Further topics===
  * [[en:materialdaten:datenbankanbindung_an_pam|]]
  * [[en:materialdaten:allgemeineangaben|]]
  * [[en:materialdaten:thermodynamische_daten|]]
  * [[en:materialdaten:dichtedaten_bzw._spezifisches_volumen|]]
  * [[en:materialdaten:rheologische_materialdaten|]]
  * [[en:materialdaten:technologische_daten|]]
  * [[en:materialdaten:tribologische_daten|]]
  * [[en:materialdaten:zusatzstoffe|]]
  * [[en:materialdaten:molekulargewicht|]]
  * [[en:materialdaten:faserabbau|]]
  * [[en:materialdaten:eingabe_von_mischungen|]]