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VENTING: PRESSURIZATION

VENTING: PRESSURIZATION. R. Dru Laws – Seljan Company Regional Meeting, Madison WI May 15 th , 2018. A Thought on Training. By my definition, training is not an investment It’s a liability … … until you can at least “pay back” the cost associated with the training

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VENTING: PRESSURIZATION

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  1. VENTING:PRESSURIZATION R. Dru Laws – Seljan Company Regional Meeting, Madison WI May 15th, 2018

  2. A Thought on Training • By my definition, training is not an investment • It’s a liability … • … until you can at least “pay back” the cost associated with the training • Do you know how much your company spent to get you here?

  3. Training Liability Training Investment Training

  4. Finishing is the key • The hidden value of “investment training” is in the finishing of it • Our industry is not at a shortage of starters • We need finishers • (Imagine trying to sell an un-finished rotomolded part) • Decide now you will be a finisher, and turn your attendance here into investment training • Finishers will always be allowed to return

  5. Presentation Outline • Introduction • Classic Temperature Profile • Layer Maturation • Pressure in the Oven Station • Pressure in the Cooling Station • Venting/Pressure when Foaming • Conclusion

  6. INTRODUCTION

  7. Introduction Pressure is just as valuable to our process as temperature It provides valuable benefits in the heating and cooling portions of the cycle We need to understand it, so we can learn to control it.

  8. TEMPERATURE PROFILE

  9. Temperature Profile Roy Crawford

  10. Temperature Profile Roy Crawford

  11. Temperature Profile Roy Crawford

  12. Temperature Profile Roy Crawford

  13. Temperature Profile Roy Crawford

  14. Temperature Profile Roy Crawford

  15. Temperature Profile Roy Crawford

  16. Temperature Profile We can thus observe: • When powder first sticks to the mold • When the powder has been consumed • When optimal melt sintering has occurred • When solidification is occurring • When the plastic separates from the mold C B D A E Roy Crawford

  17. LAYER MATURATION

  18. Layer Maturation Roy Crawford

  19. Layer Maturation Roy Crawford

  20. Layer Maturation Roy Crawford

  21. Layer Maturation Roy Crawford

  22. Layer Maturation Roy Crawford

  23. Layer Maturation Roy Crawford

  24. Layer Maturation Roy Crawford

  25. Layer Maturation Why is this TRADITIONALLY the last picture? Roy Crawford

  26. PRESSURE: IN THE OVEN STATION

  27. What about … Venting & Pressure? Video link

  28. What about … Venting & Pressure? What is the difference between blow-holes and suck-holes? Roy Crawford

  29. What about … Venting & Pressure? Roy Crawford

  30. What about … Venting & Pressure? Roy Crawford

  31. Pressurization R&D Leonardo Mold

  32. Pressurization R&D Leonardo Part

  33. Baseline Cycle Thickness = 3/8” Target PIAT = 400°F Vent = open MFE = 101 ft-lbs

  34. Baseline Cycle

  35. Max Pressurized Cycle Thickness = 3/8” Target PIAT = 400°F Vent = closed (5.5 psi) MFE = 118 ft-lbs

  36. Max Pressurized Cycle

  37. Pressure: Theory vs. Actual Thickness = n/a Target PIAT = 400°F Vent = theory vs. actual P=P0*(T/T0)

  38. Pressure: Theory vs. Actual

  39. Reduced PIAT to 355°F, open vent Thickness = 3/8” Target PIAT = 355°F Vent = open MFE = 87 ft-lbs

  40. Reduced PIAT to 355°F, open vent

  41. Reduced PIAT to 355°F, closed vent Thickness = 3/8” Target PIAT = 355°F Vent = closed (4.7 psi) MFE = 116 ft-lbs

  42. Reduced PIAT to 355°F, closed vent

  43. Reduced PIAT to 325°F, closed vent Thickness = 3/8” Target PIAT = 325°F Vent = closed (4.3 psi) MFE = 103 ft-lbs

  44. Reduced PIAT to 325°F, closed vent

  45. Supavents™ What about those of us who don’t have pressure monitoring equipment? product link

  46. PIAT to 355°F, Supavent™ Thickness = 3/8” Target PIAT = 355°F Vent = Supavent™ (3.5 psi) MFE = 98 ft-lbs

  47. PIAT to 355°F, Supavent™

  48. PIAT to 400°F, Supavent™ Thickness = 3/8” Target PIAT = 400°F Vent = Supavent™ (4.3 psi) MFE = 113 ft-lbs

  49. PIAT to 400°F, Supavent™

  50. Comparison

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