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CWP Customer Training Seminar

CWP Customer Training Seminar. Chapter: 18 Process Section. Screw Connection Profiles Barrels: Anti-wear Design, Cooling, Flanges Heating and cooling channels Screw tips Injection head. Screw Connection Profiles. 2-key profile. 6-key profile. Involute profile. Low torque.

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CWP Customer Training Seminar

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  1. CWP Customer Training Seminar Chapter: 18 Process Section Screw Connection Profiles Barrels: Anti-wear Design, Cooling, Flanges Heating and cooling channels Screw tips Injection head Standardseminar Jan.2001

  2. Screw Connection Profiles 2-keyprofile 6-keyprofile Involuteprofile Low torque Medium torque High torque Last Update: 01.2003/by:MK<Kap>.2

  3. ZSK Modular System Last Update: 01.2003/by:MK<Kap>.3

  4. Insulating Plate Between Barrels 1 and 2 Feed 1 1 - Insulating plate between barrels 1 and 2 Last Update: 01.2003/by:MK<Kap>.4

  5. ZSK Barrel with Wear Protection Inserts Barrel with wear protection(CONFORMACLAD) Barrel with replaceable wear sleeve Last Update: 01.2003/by:MK<Kap>.5

  6. Barrel with Side Feed and Vent Backward Vent Side Feed Material Flow Last Update: 01.2003/by:MK<Kap>.6

  7. Heating, e.g. Steam 40 bar Coolant e.g. Water Coolant e.g. Water Electrical heating Barrel Cooling and Heating A. Vapour/Liquid Heating B. Electrical Heating Last Update: 01.2003/by:MK<Kap>.7

  8. ZSK 380 – Barrel Heating and Cooling System Last Update: 01.2003/by:MK<Kap>.8

  9. Barrel Clamps Last Update: 01.2003/by:MK<Kap>.9

  10. Installation of a ZSK 380 Clamp Last Update: 01.2003/by:MK<Kap>.10

  11. Quiz Why is the first barrel in the process section (feed barrel) not heated ? If the feed barrel were heated, the feed-in polymer powder would adhere to the feed opening and melt. As a result a wall layer would build up and the diameter of the feed inlet would continuously shrink. Last Update: 01.2003/by:MK<Kap>.11

  12. Quiz What prevents the heat expanding from screw barrel no.2 into the only cooled screw barrel no.1 ? An insulating plate with a thickness of 1.5 mm is fitted between the feed barrel and barrel 2. This prevents the temperature of the barrel expanding to the feed barrel. Last Update: 01.2003/by:MK<Kap>.12

  13. Tip tightening torques at 20°C in Nm: ZSK 25 40 50 58 70 92 133 Bolt 5 30 60 115 130 260 570 Cap - 10 15 25 35 115 240 Standard Screw Tip for ZSK Side Feed LefthandThread Install when machine is cold!! Last Update: 01.2003/by:MK<Kap>.13

  14. Standard Screw Tip Flow profile in 8-0 piece Temp. and colour distribution at the measuring point Black PE melting charge Measuring point Tmax – Tmin= 60°C Slow MixingBlack into White Last Update: 01.2003/by:MK<Kap>.14

  15. Standard Screw Tip • With the 8-0 piece the screw points form the transition zone from twin screw to round. • Rotating at high circumferential speeds, the tips should not exert any negative influence on the polymer melting charge which flows relatively slowly in an axial direction. • Conventional conical screw points result in non-uniform melt temperatures, product is heated excessively near tip surface. • Radial mixing no longer takes -> melt inhomogenities occur. Last Update: 01.2003/by:MK<Kap>.15

  16. Mixing Screw Tips Last Update: 01.2003/by:MK<Kap>.16

  17. Mixing Screw Tips • ... do reduce heating of the melting charge • ... ensure intensive radial mixing, which has a • ... have a temperature compensation effect • ... reduce melt inhomogeneities • ... increase improve product quality Last Update: 01.2003/by:MK<Kap>.17

  18. Mixing Screw Points Flow profile in 8-0 piece Temp. and colour distribution at the measuring point Tmax – Tmin= 20°C Fast MixingBlack into White Black PE melting charge Measuring point Last Update: 01.2003/by:MK<Kap>.18

  19. Injection Head Pos. 1 8-0 Transition piece Pos. 2 Breaker plate Pos. 3 Injection head Pos. 4 Die strip Pos. 5 David (Maintenance arm) Pos. 6 Securing screws 5 6 1 2 3 4 Last Update: 01.2003/by:MK<Kap>.19

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