Related Manuals for Mold-Masters Hot Runner
Summary of Contents for Mold-Masters Hot Runner
- Page 1 Hot Runner Hot Runner User Manual Troubleshooting Guide version 1 Original Instructions...
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Page 3: Table Of Contents
1.6.13 Parts Sticking to Core ................1-17 1.6.14 Short Parts .....................1-18 1.6.15 Sinks or Voids ..................1-19 1.6.16 Splay ......................1-20 1.6.17 Streaks ....................1-21 1.6.18 Stringing ....................1-22 1.6.19 Warped Parts ..................1-23 Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 5: Section 1 - Troubleshooting
Make sure the machine has been locked out and tagged out in accordance to the machines documented procedures. Failure to do so may lead to serious injury or death. This troubleshooting information assumes that the Hot Runner has been operational. Basic rules for troubleshooting are: •... -
Page 6: Importance Of Pre-Drying Resin
Make sure the mold has been properly stored, and is dry, clean, free of rust, dirt, moisture, residual resin, pigment and any protective coating. • Check that the temperature controller meets requirements, and is fully © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide... -
Page 7: Settings
For a more thorough analysis of the defect, refer to the Troubleshooting Section in the following pages. Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 8: Defect Types, Causes And Remedies Index
Rough Surface..................19-15 Parts Sticking to Cavity................19-16 Parts Sticking to Core ................19-17 Short Parts....................19-18 Sinks or Voids ..................19-19 Splay......................19-20 Streaks ....................19-21 Stringing ....................19-22 Warped Parts ...................19-23 Weld Lines ....................19-24 © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide... -
Page 9: Troubleshooting Typical Problems
2. Trace source of contamination and repair, remove or discard 3. Adjust melt temperature if necessary 4. Inspect for dead spots: gates, runners, nozzle, back flow valve 5. Inspect feed screw for degradation Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 10: Blisters Or Bubbles
1. Verify control and / or holding pressure 2. Increase back pressure 3. Increase mold temperature 4. Inspect back flow valve 5. Ensure proper venting 6. Increase gate size 7. Decrease vent land length © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide... -
Page 11: Flow Marks
2. Add a large cold slug area 3. Add cold wells at the end of the runner system 4. Use hot sprue bushing 5. Identify and eliminate dead pockets / sections Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 12: Burn Marks
5. Check thermocouple functionality 6. Reduce feed screw rotation 7. Reduce melt temperature 8. Increase mold cavity venting 9. Enlarge gate 10. Change gate position and / or size © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide... -
Page 13: Delaminating Parts
2. Increase mold temperature 3. Decrease injection speed 4. Eliminate contamination 5. Adjust regrind ratio 6. Adjust or change resin moisture content 7. Purge system 8. Reduce sharp corners at gate Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 14: Dimensional Irregularities
5. Monitor molding machine for irregularities 6. Balance regrind ratio 7. Increase gate size 8. Decrease gate land length 9. Balance the runner and / or gate system 10. Decrease cavity quantity © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide... -
Page 15: Discolored Parts
4. Adjust residence time 5. Adjust regrind ratio 6. Adjust cycle time 7. Check for external contamination sources 8. Ensure proper cooling in all areas 9. Increase mold venting Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 16: Flash
5. Inspect the mold for irregularities 6. Reduce the melt temperature 7. Inspect vent depth 8. Switch to higher tonnage clamping machine 9. Establish correct transfer position 10. Reduce hold pressure © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide... -
Page 17: Jetting
Cold melt Solution (in sequence): 1. Decrease injection speed 2. Verify nozzle temperature 3. Increase mold temperature 4. Increase melt temperature 5. Increase gate size 6. Modify gate location Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 18: Pitted Parts
1. Reduce shear 2. Reduce back pressure 3. Reduce injection speed 4. Modify temperature 5. Modify regrind ratio 6. Modify shot size 7. Inspect Hot Runner and nozzles © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide... -
Page 19: Rough Surface
3. Material • Cold melt Solution (in sequence): 1. Increase injection speed 2. Increase injection pressure 3. Increase melt temperature 4. Increase mold temperature 5. Inspect mold surface Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 20: Parts Sticking To Cavity
5. Reduce injection time 6. Adjust feed 7. Inspect mold finish 8. Increase mold opening cycle 9. Lower mold temperature 10. Adjust differential temperatures 11. Inspect for appropriate mold release © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide... -
Page 21: Parts Sticking To Core
6. Reduce mold closed time 7. Increase core temperature 8. Decrease nozzle temperature 9. Inspect mold for undercuts and / or improper draft 10. Verify mold bending ratio Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 22: Short Parts
3. Increase feed temperature by increasing cylinder temperature 4. Increase injection time 5. Increase mold temperature 6. Increase nozzle diameter 7. Inspect for restrictions 8. Increase gate size of sprue and runner system © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide... -
Page 23: Sinks Or Voids
8. Increase sprue or runner size 9. Increase gate size / reduce gate land length 10. Relocate gate closer to heavy / thicker areas 11. If possible, core out heavy wall sections Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 24: Splay
• Wrong injection pressure • Wrong injection speed • Low back pressure 2. Mold • Friction related burning in gate, nozzle or Hot Runner • Trapped volatile compounds 3. Material • Hot melt • Contaminated resin (moisture, dirt, organics) •... -
Page 25: Streaks
3. Inspect back flow ring for wear or cracks 4. Inspect feed screw for wear and tear 5. Inspect screw / barrel for tolerances 6. Verify heater operation 7. Verify thermocouple operation Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. -
Page 26: Stringing
Solution (in sequence): 1. Reduce back pressure 2. Modify nozzle temperature 3. Modify temperature profile 4. Eliminate sprue breaks 5. Increase cooling time 6. Decrease mold temperature at the gate © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide... -
Page 27: Warped Parts
6. Increase cooling time 7. Adjust injection pressure 8. Adjust mold temperature; set sequential temperatures based on part geometry 9. Check gate dimensions, quantities and locations 10. Re-design part if necessary Hot Runner Troubleshooting Guide © 2020 Mold-Masters (2007) Limited. All Rights Reserved. - Page 28 +86 512 86162882 e: singapore@moldmasters.com e: korea@moldmasters.com e: china@moldmasters.com INDIA JAPAN tel: +91 422 423 4888 tel: +81 44 986 2101 e: india@moldmasters.com e: japan@moldmasters.com www.moldmasters.com © 2020 Mold-Masters (2007) Limited. All Rights Reserved. Hot Runner Troubleshooting Guide...
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