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CWP Customer Training Seminar

CWP Customer Training Seminar

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CWP Customer Training Seminar

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  1. CWP Customer Training Seminar Chapter: 19 Screw Elements: Types, Function, Identification Basics on screw elements Conveying elements Kneading elements Neutral elements Installation of the screw elements Numbering of the screw elements Principle of operation of the screw elements Last Update: 01.2003/by:MK19.1

  2. CWP Customer Training Seminar • The Erdmenger patent "conditions of the sealing profile must be met" • Along the screw connection there must be the same cross-section at all points • Both shafts must have the same screw profile. Last Update: 01.2003/by:MK19.2

  3. Da Do Di Di a a Characteristic Dimensions Diameter ratio:Da / Di(indicates available volume) Specific capacity:Md / a3 (Indicates torque) Do = Outer screw diameter Di = Inner screw diameter a= Axle distance Last Update: 01.2003/by:MK19.3

  4. Conveying Elements Pitch (mm) a a Da p x Da High pitch Low pitch Last Update: 01.2003/by:MK19.4

  5. Conveying Elements Right and Left-Hand Pitch Extruder Rightflighted Elements Leftflighted Elements Conveying direction Conveying direction in against the direction of the extruder flow direction of the extruder flow Last Update: 01.2003/by:MK19.5

  6. Conveying Elements, Conveying, Last Update: 01.2003/by:MK19.6

  7. Kneading Blocks Kneading disc Stagger angle 1 1 2 2 3 3 4 4 5 (5) Wide kneading discs Narrow kneading discs Spacer ring Last Update: 01.2003/by:MK19.7

  8. Kneading Blocks • Kneading blocks comprise several kneading discs arranged behind one another. • The staggering angle by standard is 45 or 90° • The number and the width of the individual kneading discs is variable. • The position of the kneading discs at the beginning and the end should be identical, for compatibility with other kneading blocks (i.e. to keep the modular concept). Last Update: 01.2003/by:MK19.8

  9. Kneading Elements Last Update: 01.2003/by:MK19.9

  10. Kneading Elements Extruder Rightflighted Elements Neutral elements Leftflighted Elements Conveying direction Conveying direction Element without in the direction against direction own conveying of extruder flow of extruder flow Last Update: 01.2003/by:MK19.10

  11. Conveying and Kneading Elements, Left-Hand Pitch Last Update: 01.2003/by:MK19.11

  12. Quiz Q: Which connection between the screw element and the screw shaft is shown? A: Refer 18.1 ff Last Update: 01.2003/by:MK19.12

  13. Installation of Screw Elements Last Update: 01.2003/by:MK19.13

  14. Installation of Screw Set Elements Last Update: 01.2003/by:MK19.14

  15. Installation of Screw Set Elements 1-flight elements 2- flight elements 3- flight elements Faces always parallelly Faces always offset by 90° Faces always parallelly Last Update: 01.2003/by:MK19.15

  16. Profile Transitions Profile A Profile B Profile A Profile B • Transition piece required • for profile joint (profile A to B • if the faces of identical profiles are offset (kneading block) Risk of breakage Last Update: 01.2003/by:MK19.16

  17. Transition Elements • For technical fluidic reasons, but also to prevent mutual contact of the screws, a transition piece is necessary between different profile cross-sections, similar to that required for kneading blocks. • Spacer rings, with the same outside diameter as the inside diameter of the screw elements, can be used instead of transition elements in some cases. Last Update: 01.2003/by:MK19.17

  18. - - 0 0 . 2 1 0 6 0 / 0 6 0 - 2 4 8 0 4 0 Part Numbers on the Screw Elements Screw diameter Element length Material Pitch of conveying elements 00 Nitriding steel 05 Cr steel 68 CPR-HSS steel Profile No. of flights, direction 15 Wear and/or corrosion protected elements of composite materials 1 25 1 1-channel, right Screw element with sealing profile 2 2 2-channel, right Screw element with sealing profile 3 3-channel, right 6 Kneading block 4 1-channel, left 37 CPR - composite material 5 2-channel, left Connection Screw Elemnet/Shaft 3-channel, left 6 9 Special version Offset angle 00, 01, 02 Feather key (0°) 6-key 66, 67, 68 3 30° Kn.block : 4 0 5 24, 25, 34 Involute SC 4 45° 34 MEGA-Compounder 6 60° Other numbers available for special geometries. 9 90° No. of discs Last Update: 01.2003/by:MK19.18

  19. Recognising Screw Element Materials Material no. Material Specif. 00 05 Nitriding steel nitrified Standard wear protection HIP - composite 15 Corrosion and wear-resistant HIP - composite 25 Last Update: 01.2003/by:MK19.19

  20. Recognising Screw Element Materials Material no. Material Specif. Former standard wear protection HIP - composite 10 Soft martensitic hardened Cr-Ni steel with applied crest welding 28 Last Update: 01.2003/by:MK19.20

  21. Pressure Barrier Process Section Left-handed Conveying elements elements Conveying Kneading- Mixing elements elements Principle of Operation of the Screw Elements Mixing Kneading (homogenising) (dispersing) Last Update: 01.2003/by:MK19.21

  22. 2-flight elements Main portion of the product flows from one screw to the other. => lower transport capacity 1-flight elements Reduced product flow from one screw to the other. => improved transport capacity Conveying Mechanism Last Update: 01.2003/by:MK19.22

  23. Principle of Operation of the Conveying Elements Type of element Free cross-section Conveying efficiency 1-channel elements Standard elements "Undercut" elements Last Update: 01.2003/by:MK19.23

  24. Filling Level of Conveying Elements With decreasing pitch the free volume in the screw channel decreases, i.e. the filling level increases. Last Update: 01.2003/by:MK19.24

  25. Filling Level of Conveying Elements • Normally conveying elements with a high pitch are installed below the feed inlet. • The bulk material is compressed by the reduction in pitch in a downstream direction, i.e. as a result of reduction of the channel volume. Last Update: 01.2003/by:MK19.25

  26. standard X° neutral Merit comparison for different Kneading Blocks wide vs. narrow: standard vs. neutral: Type of element Mixing effect Conveying effect Type of element Mixing effect Conveying effect Kneading effect (shearing) Kneading effect (shearing) Last Update: 01.2003/by:MK19.26

  27. p [bar] p [bar] Left-Handed Elements product flow Last Update: 01.2003/by:MK19.27

  28. Left-Handed Elements Last Update: 01.2003/by:MK19.28

  29. Neutral kneader block Left-handed kneader block Left-handed screw element Principle of Operation of the Left-Handed Elements Build-up effect Type of element Right-handed screw element with low pitch Last Update: 01.2003/by:MK19.29

  30. re li re li re li re li re li 1 1 Tracer 2 2 0 50 100 150 Time (sec) 3 3 Residence Time with left and righthand KB with righthand kneading block without kneading block Last Update: 01.2003/by:MK19.30

  31. Recognising Screw Element Materials Q: Which features can be used to recognise the material of a screw element if the material code on the faces of the screw elements has become illegible with cleaning? A: refer Chapter 19, slide 18ff Last Update: 01.2003/by:MK19.31