Common problems during the bottle stretch blowing process. Part 6

Problem No. 9 :  Bottle milky color.

Symptom: It may happen on the bottle body and bottle below-neck part. The most common place is at the bottle.

1. Foggy-like milky color: this is caused by low heating temperature.

2. Cleat milky color: this is caused by high heating temperature.

l Causes& Solutions:

1. Foggy-like milky color. Increase the heating temperature for the milky color part.

2. Clear milky color. Reduce the heating temperature for the milky color part.

3. If all bottles are looking good, but just some of the bottles are milky color. There may be another two considerations:

3.1. Pre blow pressure is too low. Try increase the pre blow pressure.

3.2. Air leaking on the pre blow part. Blow nozzle is too high above the bottle neck, or the two sides of the molds are not in the same level.

 

l Conclusion for all these articles:

These above mentioned problems are the normally problems for the blow molding process. They may happen on the bottles at the same time, and affect the bottle quality very seriously.

We will need to study and learn and try to figure out the solutions in a comprehensive way.

At the beginning of the blow molding process, we can take only one preform for testing. When we get the bottle, we check the bottle to see what is the bottle look like, then we find the right solution according to the problems on the bottles.

We need to be patient and careful on handling all these problems.

http://www.sinobema.com/Difference-between-bottles-of-pure-water?article_id=100

From Sino Beverage Machinery Co., Ltd China
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