Do You Know That How The Plastic Bottles Are Produced
When you visit the supermarket for shopping, you may take a look at the drinking water and the food cooking oil which are in different bottle volume, small ones or big ones, normally made of PET. Plastic bottles are used in common now.
How The Plastic Bottles Are Produced:
Here is the machine called plastic PET bottle blowing machine which can make different shape and volume plastic bottles.
Firstly you need to get the plastic PET bottle preform and then the plastic PET bottle blow molding machine.
Here is the standard process of the bottle blowing.
The bottle preforms will be automatically moved to the infrared heating zone where they will be heated softly and then go towards the bottle blowing molds.
The bottle blowing molds are designed according to the bottle shape like the round bottle or the square bottle even the special custom-ed made shape.
The heated bottle preforms inside the bottle blowing molds will be blown by the high-pressure clean air. The whole process can be done within several seconds. After this, the blowing molds open and the final products of the plastic PET bottle will be finished.
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FAQ:
Q: What is the working principle of a PET blow molding machine?
A: A PET blow molding system first places a heated PET preform into a mold, and then uses high-pressure compressed air to blow it into the desired bottle shape. The entire process includes steps such as heating, mold closing, blowing, pressure holding, exhaust, and mold opening.
Q: What are the differences between fully automatic and semi-automatic PET blow molding machines?
A:Fully automatic: The entire process from preform loading, heating, blowing, to bottle unloading is automated, suitable for large-scale continuous production (such as beverage factories), with high efficiency (up to several thousand bottles/hour).
Semi-automatic: Requires manual preform loading or bottle removal, suitable for small batches, multiple varieties, or start-up companies, with low investment cost and high flexibility.
Q: Can the same blow molding machine be used to produce different bottle types?
A: Yes, but it requires changing the corresponding mold and adjusting parameters (heating zone, blowing pressure, stretching rod stroke, etc.). Some high-end models support a quick mold change system (<30 minutes for mold change).
Q: Why do the blown bottles have a white or hazy appearance at the bottom?
A: This is usually caused by uneven heating or insufficient preform temperature. Solutions:
- Adjust the infrared lamp power and heating time;
- Ensure the preforms are dry (moisture can cause crystallization and whitening);
- Check if the mold cooling is uniform.
