Case Study:
Reducing 8-Cavity Imbalance from 9.6% to 0.6% Using Cav-Bal®Study details
| Item | Case study value |
|---|---|
| Tool type | 8-cavity hot runner mould |
| Study type | Short-shot cavity balance |
| Data per stage | 3 shots per profile initially then reduced due to low shot-to-shot variation |
| Starting condition | Flat hot runner profile |
| Final result | Profile 3 |
| Starting measured imbalance | 9.58% |
| Final measured imbalance | 0.61% |
| Overall reduction in measured imbalance | Approximately 94% |
Cavity Balance Correction Summary
An 8-cavity hot runner balance study was carried out using Cav-Bal®. The initial short-shot study was completed with all hot runner drops set to the same temperature and produced a measured cavity imbalance of 9.58%.
Calculated profile corrections were then applied and the cavity balance improved progressively:
9.58% → 2.78% → 0.79% → 0.61%
This represents an overall reduction in measured imbalance of approximately 94%.
The average fill level remained close to 92% throughout the study, providing a consistent basis for comparing the cavity response at each stage. The final verification result placed all eight cavities within the selected ±2% deviation tolerance, with a maximum absolute cavity deviation of only 0.33%.
Screenshots from Cav-Bal®
Why this matters
In many moulding environments, cavity balancing is still done by judgement and repeated trial work. That can be slow, subjective, and difficult to document.
Cav-Bal® gives engineers a data driven method:
- measure cavity weights,
- calculate a corrected hot runner profile (calculated automatically in the software),
- run the next profile,
- review the measured response,
- continue only as needed.
The case study shows the process moving from a significant cavity imbalance to a highly balanced result in a small number of calculated steps.
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Cav-Bal® gives injection moulding engineers calculated hot runner tip corrections from short-shot cavity weight data.Register and download now for your free 30 day trial.