There are two ways involved in manufacturing plastic water bottles. The first one has a two step process that use preforms or parsions that appear like test tube. This is known to be the injection stretch blow molding.
The first step starts with the liquefied polyethylene terephthalate into the cavity in which the test tube shape will be formed. The preform will be cooled down before it is moved into the conditioning station where it would be reheated and softened to prepare it for the next step.
The second step is the phase in which the preform would take its final shape. This process involves blowing where the preform is heated quickly and placed in stretch blow molding hot air is brought into the hollow plastic. This will inflate it into a final product. Then the design number as well as the name of the company will be found at the bottom part of the bottle. This will be encrypted in the blowing stage before it is booted out for cooling.
In the second method, all of the processes required in making water bottles are accomplished in a single done. This helps minimize the use for manpower, space and energy required for machinery. The two step method is quite an advantage for water bottles that prefer to stock on preforms or want to buy them from suppliers. If there is adequate preforms available, the system is proven faster compared to using single step process. A single blowing ejection cycle can actually produce average of 1300 or more plastic water bottles, depending on the size and volume of the bottle.
The rate of production is identified by the thickness of the wall of the bottle as well as the number of cavities that are in the machine. If a bottle has wall thickness of about 3.0mm can take 14 seconds to inflate the preform to its full sized shape.
Recycling plants can turn back the used bottle into raw materials through chemical processes such as hydrolysis in which higher water pressure is applied into the PER on supercritical conditions. Plastic water bottle users are suggested to recycle them since it would take hundreds of years for plastic to decompose.