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en:eingabe_der_schneckendaten:barrierezone [2025/01/16 14:43] – [Input mask] cschallen:eingabe_der_schneckendaten:barrierezone [2026/09/01 15:48] (aktuell) – admin
Zeile 4: Zeile 4:
 ===== General geometry of a barrier section ===== ===== General geometry of a barrier section =====
  
-Barrier zones are much more complex in their structure than feed, (de)compression and metering zones. In a barrier zone, a distinction is made between solid material and melt channel, as can be seen in the following illustrations. +Barrier zones are much more complex in their structure than feed, (de)compression and metering zones. In a barrier section, a distinction is made between solid and melt channel, as can be seen in the following illustrations. 
  
 {{ :eingabe_der_schneckendaten:abb_barriere_uebersicht_01_en.svg?800 |}} {{ :eingabe_der_schneckendaten:abb_barriere_uebersicht_01_en.svg?800 |}}
Zeile 10: Zeile 10:
 {{ :eingabe_der_schneckendaten:abb_barriere_uebersicht_02_en.svg?600 |}} {{ :eingabe_der_schneckendaten:abb_barriere_uebersicht_02_en.svg?600 |}}
  
-While the main web comes from the previous zone and merges into the subsequent zone, there is a barrier web within the barrier zone that separates the solids channel from the melt channel.+While the main flight comes from the previous section and merges into the subsequent zone, there is a barrier flight within the barrier section that separates the solids channel from the melt channel.
  
 At the beginning of the barrier zone, the solids channel predominates, whereas the melt channel begins anew. In the course of the barrier zone, the channel cross-section of the solids channel usually becomes smaller and that of the melt channel usually becomes larger. Typically, the solids channel is kept as wide and flat as possible so that the highest possible melting rate is achieved due to the large surface area. By reducing the channel cross-section, the melted plastic passes into the melt channel, which typically has a high channel depth for good temperature control. At the beginning of the barrier zone, the solids channel predominates, whereas the melt channel begins anew. In the course of the barrier zone, the channel cross-section of the solids channel usually becomes smaller and that of the melt channel usually becomes larger. Typically, the solids channel is kept as wide and flat as possible so that the highest possible melting rate is achieved due to the large surface area. By reducing the channel cross-section, the melted plastic passes into the melt channel, which typically has a high channel depth for good temperature control.
Zeile 23: Zeile 23:
 |L //or// L/D   | Length of the zone     |  |L //or// L/D   | Length of the zone     | 
 |δ (delta)  | Screw clearance| |δ (delta)  | Screw clearance|
-|b_i     | Number of flights |+|b_i     | Number of channel pairs |
 |t_h //or// t_h/D   | Pitch of main section | |t_h //or// t_h/D   | Pitch of main section |
 |t_b //or// t_b/D   | Pitch of barrier section | |t_b //or// t_b/D   | Pitch of barrier section |
Zeile 32: Zeile 32:
 |h_f_0 and h_f_1   | Channel depth of the solids channel at the start and end of the current zone | |h_f_0 and h_f_1   | Channel depth of the solids channel at the start and end of the current zone |
 |h_s_0 and h_s_1   | Channel depth of the melt channel at the start and end of the current zone | |h_s_0 and h_s_1   | Channel depth of the melt channel at the start and end of the current zone |
-|r_f_tr | Radius active flight of main section | +|r_f_tr | Radius active flight of main flight | 
-|r_f_ntr  | Radius non active flight of main section | +|r_f_ntr  | Radius non active flight of main flight | 
-|r_s_tr | Radius active flight of barrier section  | +|r_s_tr | Radius active flight of barrier flight | 
-|r_s_ntr  | Radius non active flight of barrier section | +|r_s_ntr  | Radius non active flight of barrier flight | 
-|gamma_f | Flight angle of main section | +|gamma_f | Flight angle of main flight | 
-|gamma_s | Flight angle of barrier section |+|gamma_s | Flight angle of barrier flight |
  
 It should be noted that a barrier zone **always** consists of an inlet, **at least** one main section and an outlet. Several main zones can be defined in succession in order to make gradual changes to the channel geometry. These can be added or removed using the "+" and "-" in the top right-hand corner of the input window. The number of pairs can only be changed in the inlet zone. The other barrier zones adopt these values. It should be noted that a barrier zone **always** consists of an inlet, **at least** one main section and an outlet. Several main zones can be defined in succession in order to make gradual changes to the channel geometry. These can be added or removed using the "+" and "-" in the top right-hand corner of the input window. The number of pairs can only be changed in the inlet zone. The other barrier zones adopt these values.
Zeile 43: Zeile 43:
 ===== Notes ===== ===== Notes =====
  
-**IMPORTANT**: In REX/PSI, the barrier zone inlet does **not** begin where the barrier web emerges from the main web, **but only** at the position where the melt channel begins. An initial melt channel width b_s_0 (> 0 mm) must be specified at the start of a barrier inlet zone. For example, if the melt channel starts with a radius of 2 mm between the barrier and main web, the initial channel width of the melt channel is assumed to be 4 mm and the start of the barrier zone is also set to this position.+**IMPORTANT**: In REX/PSI, the barrier zone inlet does **not** begin where the barrier flight emerges from the main flight, **but only** at the position where the melt channel begins. An initial melt channel width b_s_0 (> 0 mm) must be specified at the start of a barrier inlet zone. For example, if the melt channel starts with a radius of 2 mm between the barrier and main flight, the initial channel width of the melt channel is assumed to be 4 mm and the start of the barrier zone is also set to this position.
  
-The division into the individual barrier zones is usually determined on the basis of changes in the channel gradient or changes in the channel depth profile.+The division into the individual barrier zones is usually determined on the basis of changes in the flight pitch or changes in the channel depth profile.
  
 {{ :eingabe_der_schneckendaten:abb_barriere_zonenaufteilung_en.svg?400 |}} {{ :eingabe_der_schneckendaten:abb_barriere_zonenaufteilung_en.svg?400 |}}
Zeile 52: Zeile 52:
    
 <details><summary>**Overview of input masks**</summary> <details><summary>**Overview of input masks**</summary>
 +==== New dialogue====
 +{{ :en:eingabe_der_schneckendaten:rex190_barriere_en_001.png?nolink |}}
 +==== Classic dialogue====
 {{ :eingabe_der_schneckendaten:rex180_barriere_en_001.png?nolink |}} {{ :eingabe_der_schneckendaten:rex180_barriere_en_001.png?nolink |}}
 {{ :eingabe_der_schneckendaten:rex180_barriere_en_002.png?nolink |}} {{ :eingabe_der_schneckendaten:rex180_barriere_en_002.png?nolink |}}
 {{ :eingabe_der_schneckendaten:rex180_barriere_en_003.png?nolink |}} {{ :eingabe_der_schneckendaten:rex180_barriere_en_003.png?nolink |}}
 +
 </details> </details>
  
-===== Determination of duct widths =====+===== Determination of channel widths =====
  
-The calculation of the channel widths within the barrier feed section, main section +The calculation of the channel widths within the barrier inflow-, main- 
-and outlet section has been revised in the REX version 6 and 18 respectively PSI version 4 and 16.+and outflow section has been revised in REX version 6 and 18 respectively PSI version 4 and 16.
 Therefore, the saved values of a barrier screw file in a previous PSI/REX version will Therefore, the saved values of a barrier screw file in a previous PSI/REX version will
 generally not correspond to the channel widths of a newly entered barrier screw generally not correspond to the channel widths of a newly entered barrier screw
 although the geometrical parameters that determine the channel width (length, gear pitch, etc.) are identical. although the geometrical parameters that determine the channel width (length, gear pitch, etc.) are identical.
  
-When loading a barrier screw file of a previous PSI/REX version, REX 6 respectively +When loading a barrier screw file from an earlier REX/PSI version, REX or PSI automatically updates the stored solid and melt channel widths. If the user performs a calculation with the previously loaded barrier screw, the calculation will be carried out using the updated channel widths.
-PSI 4 does automatically update the saved solid and melt channel widths. If the user +
-does the calculation of this previously loaded barrier screw, the calculation is +
-executed with the new channel widths. +
  
-The barrier zone begins with the barrier walkway and ends with the barrier walkway. The position for determining the channel width is therefore on the barrier web. The position where the barrier web begins (in REX/PSI, i.e. where the initial width of the melt channel is specified) determines the initial aisle widths of the barrier zone (coordinate x=0 in the following figure). +The barrier zone begins with the barrier flight and ends with the barrier flight. The position for determining the channel width is therefore on the barrier flight. The position where the barrier flight begins (in REX/PSI, i.e. where the initial width of the melt channel is specified) determines the initial channel widths of the barrier zone (coordinate x=0 in the following figure). 
  
 {{ :eingabe_der_schneckendaten:abb_barriere_kanalbreite_01_de_en.svg?1000 |}} {{ :eingabe_der_schneckendaten:abb_barriere_kanalbreite_01_de_en.svg?1000 |}}
  
-This means that the passive (non-driving flank) of the barrier web determines the position for determining the aisle width as a function of the coordinate x in the axial direction. However, as can be seen in the figure, the aisle width is always determined perpendicular to the main web.+This means that the passive (non-driving) side of the barrier flight determines the position for determining the channel width as a function of the coordinate x in the axial direction. However, as can be seen in the figure, the channel width is always determined orthogonal to the main flight.
  
-In the entry and exit zones, only the aisle widths at the zone transition (b_f/s_00 and b_f/s_11) are specified. In barrier main sections, the widths are also specified at the positions at which the channels are first (b_f/s_01) and last (b_f/s_10) completely **within** the main section (see following figure). +In the inflow and outflow section, only the channel widths at the zone transition (b_f/s_00 and b_f/s_11) are specified. In barrier main sections, the widths are also specified at the positions at which the channels are first (b_f/s_01) and last (b_f/s_10) completely **within** the main section (see following figure). 
  
 {{ :eingabe_der_schneckendaten:abb_barriere_kanalbreite_02_en.svg?nolink&700 |}} {{ :eingabe_der_schneckendaten:abb_barriere_kanalbreite_02_en.svg?nolink&700 |}}