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The “Right” machine for the job?

The “Right” machine for the job?. The Tool. The Material. Introduction. But which Machines?????????. Legal Requirement. MSDS. Moulding. CH. O. 3. O. C. O. C. n. CH. 3. What is Polycarbonate?. 800. 100. Tensile strength (kg/cm2). 700. 50. Izod impact strength (kg cm/cm).

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The “Right” machine for the job?

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  1. The “Right” machine forthe job?

  2. The Tool The Material Introduction

  3. But which Machines?????????

  4. Legal Requirement MSDS

  5. Moulding

  6. CH O 3 O C O C n CH 3 What is Polycarbonate?

  7. 800 100 Tensile strength (kg/cm2) 700 50 Izod impact strength (kg cm/cm) 0 600 2 2.5 3.0 Molecular weight (x10 ) 4 Molecular Weight Vs. Strength

  8. 10 6 5 Flow Value (10 m/sec) 4 3 2 1.5 20,000 25,000 30,000 Molecular weight Molecular Weight Vs. Flow

  9. Injection Moulding Hopper Clamping unit Screw & Barrel Nozzle

  10. Clamping Pressure Calculated by multiplying the projected area of the cavity (cavities), including runner system by the maximum internal pressure (hold pressure).

  11. Clamping Pressure • ABS 0.45 to 0.65T/cm2 • LCP 0.75 to 0.8T/cm2 • PA 0.65 to 0.75 T/cm2 • PBTP 0.65 to 0.75 T/cm2 • PC 0.5 to 0.8 T/cm2 • PE 0.15 to 0.55 T/cm2 • PETP 0.65to 0.75T/cm2 • PMMA 0.45 to 0.75 T/cm2 • POM 0.85 to 1 T/cm2 • PP 0.15 to 0.55 T/cm2 • PPS 0.3 to 0.6 T/cm2 • PS 0.3 to 0.5 T/cm2

  12. Injection Unit Hopper Screw & Barrel Nozzle

  13. Screw Design

  14. Screw Types

  15. Screw Tangential Speed-M/S • ABS 0.2 (GR,FR) - 0.3 • ETPV 0.2 • PA 0.15 (GR,FR) – 0.4 • PBTP 0.2 (GR,FR) – 0.3 • PC 0.2 (GR,FR) - 0.3 • PE 0.5 – 0.6 • PETP 0.15 (FR) – 0.20 • PMMA 0.2 (ST) – 0.3

  16. Screw Tangential Speed-M/S • POM 0.15 (GR,ST) – 0.3 • PP 0.3 (GR) – 0.6 • PPA 0.15 • PPS 0.15 • PS 0.3 (HI) - 0.6 • PVC <0.1 • SAN 0.3 • TPC-ET <0.2 • TPUR <0.15

  17. Screw Speed Calculation Beware: High speed = high heat (through shear). High speed = high abrasion with filled Materials. Beware: High back pressure increases shear (temperature) and cycle time but not necessary melt quality.

  18. 4 10 280c 300c Melt viscosity (poise) 320c 3 10 3 4 10 10 Shear Rate (Sec ) -1 Melt Viscosity characteristics

  19. PPH PA 6 GPPS 120 PPC HDPE Spiral flow length (cm) LDPE 80 POM ABS Polycarbonate 40 2 40 (Kg/cm G) 140 Injection Pressure Pressure Vs. Flow

  20. 10000 35 min 20 min 1000 Residence time Lowering of mol. wt. (Mv) 5 min 100 350 340 320 300 280 Moulding temp (deg.C) Temp. Vs. Molecular Weight

  21. Hold-on-time Toughened Nylon 6.6

  22. Temperature Profiles

  23. The right Melt temperature The right Melt quality Conclusion

  24. A Polymer for Every Application

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