When purchasing PET plastic packaging bottles, some people may find that the quality of some suppliers' products is very substandard, and the plastic bottles produced have problems such as "yellowing" and "white mist". However, they do not know the cause of the problem. Next, let the editor explain to you.

Why does it change color? Because PET has a certain hydrophilicity, when the moisture content exceeds the limit, the molecular weight of PET will decrease during processing, leading to problems such as discoloration and embrittlement. So if using recycled materials, the proportion of recycled materials should not be too high, and absolute dryness should be maintained.

The occurrence of opaque "white mist" phenomenon is due to poor control of mold temperature or material temperature. The mold should be kept at a low temperature and the cooling process must be fast, so that the cost of the plastic bottle produced can be transparent.

When purchasing PET plastic packaging bottles, in addition to paying attention to the occurrence of the above two problems, the editor reminds you to also pay attention to whether the bottle thickness is uniform, whether the bottle capacity is too small, whether there is oil stains, whether the height is different, whether there are problems such as neck concavity and material accumulation.