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Kenplas Forum ==> Blow Molding ==> pe bottle & pet bottle difference
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PET preforms will be re-heated up to 110°C, so you have lower energy costs in a 2-stage process. The PET material is clear and is a good absorber for infrared radiation (re-heating is done with infrared heater lamps).
Another reason is that the PET material has a so called self regulated wall thickness effect. When the material is blown (starts with a bubble) the thin material becomes strengthen at ~0,25mm and "borrows" material from thicker areas during blowing, which leads to a smooth wall thickness distribution.
Other materials do not have this characteristic so that blowing becomes much more difficult (bottle bursts during blowing, bad material distrbution and low mechanical properties).

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 3/26/2009 7:58:44 PM By Daniel
PET is popular for water because it dosen't affect taste and the crystal clear plastic makes the water look good.
PET is not a good material for extrusion blow moulding as it has the wrong properties when molten.
It is easier to make pre-forms and then stretch the pre-form to the final shape. This semi-hot stretching also makes a stronger bottle as the long chains of the polymers are bi-axially stretched which increases stength.
You can of course buy water in gallon containers in many supermarkets.

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 9/25/2008 3:34:19 AM By Robin Enderby
hi
1. I would like to know why for storing mineral water only PET bottles use?
2.why we make preform from pet, but for making pe bottle we don't make preform?
3.also i would like to know other differences between pe and pet bottles.

best wishes

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 6/23/2008 3:26:01 PM By somayeh
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