Public Program
PLASTIC INJECTION MOLDING DEFECTS PREVENTION & ROOT CAUSE ANALYSIS
Course Introduction
Specifically designed for the practicing designer and molder.
This workshop focuses on prevention methods for defects and developing systematic root cause analysis skills. For solving molded-part defects and improving part quality problems.
Course objective
- How to prevent defects from occurring in the first place?
- Eighty % of plastic parts problems originate from poor design.
- Gap analysis between DFM (Design for Manufacturing best practices) and your actual problems
- Root cause analysis
- Troubleshooting injection moulding defects in a systematic manner
- Implementing sustainable measures in place to prevent defects recurrence
- Scientific explanations on why these problems occur.
Course Content
1. Plastic drying
- Degradation
- Drying time
- Drying temperature
- Types of dryers
- Moisture measurement
- Overdrying effect
2. Process optimization & scientific molding
- Optimization of injection phase
- Cavity balance
- Pressure drop
- Process window
- Gate seal time
- Cooling time
- Screw speed & back pressure
3. Surface Defects
- Flow lines and jetting
- Splay (moisture or trapped air)
- Haze, blush, and poor gloss
- Mold mark
- Gate blush and gate splay
- Ink smearing
- Incomplete molding
- Race tracking
- Jetting
- Moldflow simulation errors
4. Burning and Contamination Problems
- Burn marks and black specks
- Burn streaks
- Contamination
- Discoloration or poor color match
5. Physical Problems
- Flash
- Short shots
- Sink marks
- Vacuum voids and bubbles
- Burrs
- Bulging
- Overweight
- Ejector marks
6. Geometry Maintenance Problems
- Under- or over-sized dimensions
- Poor dimensional repeatability (poor Cpk)
- Warpage and bowing
7. Structural Defects
- Cracking, crazing, and brittleness
- Weld lines
- Stuck parts and pin push marks
- Long gates and plugged gates
- Drag marks and mold damage
- Break during assembly
- Break after usage
8. Troubleshooting Procedures and Logic
- How to effectively approach, analyze, and implement troubleshooting procedures.
9. Exploring Root Causes
- Explore the root causes of the various defects from the perspective of the plastic material as it fills, compresses, and cools within the cavity.
10. Part Defectives and Potential Solutions
- How to avoid potential design-related problems?
- How to optimize the part quality with process-related solutions?
11. Troubleshooting Guides (The Good, The Bad, The Efficient)
- A comparison of the different troubleshooting guide formats, including which tend to be most effective for solving molded part problems.
12. Evaluating Attendees’ Molded Part Samples
- Defective part samples brought in by the participants will be discussed in a group format.
- An understanding by the participants of the processing conditions or a current process set-up sheet will greatly facilitate this discussion.
“Unlock new opportunities by joining our training. Sign up now and invest in your future!”
- 24 & 25 February 2025
- MON & TUE
- 9AM - 5PM
- WYNDHAM GRAND BANGSAR KUALA LUMPUR HOTEL / LIVE ZOOM TRAINING
By: HYBRID PUBLIC PROGRAM
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