Injection molded parts play a critical role in modern industrial production. 然而, even minor details can lead to unnecessary defects, posing challenges in injection molding processes. One common issue is the occurrence of cracking defects. 所以, what are the primary causes of cracking defects in injection molded parts?
- High Proportion of Recycled Material in Raw Materials: Using too much recycled material can increase shrinkage directionality or lead to uneven filler distribution in the raw material.
- Contaminated or Poorly Dried Raw Plastic Material: Contaminants, volatiles, or insufficient drying in raw plastic can contribute to cracking.
- Improper Ejection Design: Insufficient ejection angle, thin walls, sharp corners, or notches in the product can lead to stress concentration.
- Insufficient Hold Pressure and Injection Time: Short holding and injection times, or improper cooling times, can also be contributing factors.
- Uneven or Low Mold Temperature: Low or uneven mold temperature, combined with slow injection speed and low pressure, may result in cracks.
- Improper Molding Conditions: Excessive stress or poor ejection can cause structural weakness.
- Improper Use of Release Agent: Incorrect use of release agents or uneven cooling after demolding can lead to defects.
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