Wednesday, December 24, 2008

PC vs. PET 5 Gallon Jars

We have been receiving a lot of mail about polycarbonate 5 Gallon jars. 5 gallon jars otherwise referred to as 20 liter bottles are conventionally blown from regular PET preforms. Although these are costly to manufacture, because preforms are compact they can be outsourced overseas or from local manufacturers and blown on site by a semi-automatic blowing machine. The problem with regular PET 5 gallon jars is that they do not have a very long lifespan. These bottles are sent out and retrieved on a daily basis so durability is essential. Polycarbonate has a higher density and therefore produces a much stronger jar that lasts up to 4 times longer than a regular PET bottle. In most developed countries PET 5 gallon bottles have already been phased out and replaced with PC.

PC however can not be formed into preforms that can be heated and blown to full size at a later stage. PC jars must be manufactured on a single stage machine, sometimes referred to as an ASB machine. The preform is manufactured then immediately blown into full form while the plastic is still soft. The cost of this machine is relativly more expensive than the PET sollution but is still viable for larger cities in Africa.

If you are looking for more information about blow moulding machines for PET or PC bottles please do not hesitate to contact us.

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