Stretch molding of the bottle shape vs blow molding.If you need a parison or preform, for PET bottle blow molding, you will require preforms.There are, of course, some variations of the exact steps depending on whether you’re operating a single-stage or two-stage production line. Remove the cured and shaped, cooled bottle from the equipment.Cooling of the preform, so it holds shape.Injection of liquid PET into a preform mold specific to the bottle shape and size.Heating of the PET material to correct temperature where it is workable.Thorough drying of PET materials and dehumidification.
Whether you are using a single-stage or two-stage blow molding machine for producing bottles, the following steps need to happen: Since most beverage bottles are manufactured from PET plastic, the demand for reliable, efficient machinery will also grow.Īs with all manufacturing processes, some steps need to be followed systematically, ensuring a consistent product and quality for your customers. With numbers like this, the plastic bottle industry is only poised to continue growing in the years ahead as the uptake increases in countries that still rely on glass over plastic. That’s 40 billion per month and 1.3 billion per year.” If you have a stretch blow molding machine, there will be one more step here to shape the bottle, after which the finished bottles are allowed to cool and then ejected so they can move to the next step of your setup.Īccording to Habits Of Waste, “481.6 BILLION plastic bottles were used worldwide in a single year. The hot pressurised air is blown into the plastic preform or parison to produce the bottles. Your preforms or parisons then get heated up to make them workable before being blown into the desired size and shape. This is calculated in advance, so you end up with the exact bottle you need.
The PET plastic will need to be heated up and formed into the desired size, shape, and weight if manufacturing them in-house. PET starts by being inserted into the machines via a preform or parison these can be made within the same factory or purchased separately. It is a manufacturing process typically used for creating plastic bottles however, it can also be used to produce oil cans and larger plastic containers.īlow molding is also used in the mass production of glass bottles and jars.įor this article, we will focus on PET plastic blow molding.
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