Call Us Today
+86-13165410090
Send us
Qihe New Materials and High end Equipment
Manufacturing industrial Park
Views: 0 Author: Site Editor Publish Time: 2025-11-03 Origin: Site
Bottle bottom not fully expanded (“thick bottom,” “collapsed bottom,” or “raised center”).
Base pattern unclear or material gathered in the center (whitening).
Bottom wall too thin on edges but too thick in the center.
| Category | Possible Cause | Corrective Action |
|---|---|---|
| Uneven Heating | Bottom of preform not heated enough | Increase bottom heating temperature or extend heating time to soften the preform evenly |
| Insufficient Air Pressure | Low pre-blow or high-pressure air | Check air system, maintain 25–35 bar; ensure timely pre-blow and main blow |
| Improper Stretch Rod Motion | Rod not reaching full depth or moving too slowly | Adjust stretch rod speed and stroke to reach the exact center of the mold bottom |
| Low Mold Temperature | Excessive cooling at the base | Raise mold bottom temperature or reduce cooling water flow |
| Poor Preform Design | Insufficient material at preform bottom | Redesign preform bottom thickness or adjust infrared lamp angle |
| Incorrect Air Timing | Delay between pre-blow and main blow | Optimize blowing sequence and timing parameters |
| Uneven Cooling | Water circulation imbalance | Inspect cooling channels, balance water flow and temperature |
Adjust bottom IR lamps to focus heat on the preform base.
Keep oven temperature stable to avoid uneven heating.
Synchronize stretching and pre-blow actions precisely.
Record daily parameter settings for quick troubleshooting.
Identify whether the issue is temperature-related or mechanical.
Observe preform color: dark = underheated, white = overstretched.
For repeated issues, recalibrate heating and stretching timing curves.
We pursue the same price, high-quality products, so that users have a better experience after receiving them. This is our responsibility and obligation
