Still, it does come with higher initial capital investment to acquire the equipment. This style of blow molding machine tends to be the most cost-effective solution, mainly when producing quantities of containers and bottles for widespread use. These processes are carried out by the same machine it is essentially a production line housed within one piece of equipment, taking care of three or four separate steps.Įach of these stations is automated so the equipment can run continuously without human input this can help increase your overall productivity within the factory and then dispense the finished bottles straight into the next step of your production line.īy reducing the number of machines, you can save valuable floor space and run a more compact operation overall. This type of injection blow molding refers to the machine being a single-stage of course, several processes need to occur to produce bottles within this. If your bottling plant relies on injection blow molding or injection stretch blow molding, you’ll need preforms of PET. Modern advances in the production methods of preforms have improved accuracy, and their shipping is relatively efficient as they’re compact and lightweight.įilling sites tend to favour doing things in this way since they don’t have to acquire the injection molding apparatus themselves or have skilled operators run it and check tolerances. It may be more cost-effective to purchase the preforms from another manufacturer. Working in this manner means you can produce the preforms yourself in-house and then store them until needed. Once cooled sufficiently, these PET preforms can be stored until needed, when they’ll be reheated and stretch blow molded to their final shape and size. Preform molds are contained within the machine where the plastic is injected under pressure, incorporating the bottleneck and thread as specified. These are produced using plastic injection molding the raw PET plastic pellets and heating them to adequate temperature can flow like a viscous liquid. To discover more about the specific details & science of PET plastics, this website can prove useful.

If the preform is run through a finishing machine before being turned into a bottle.

Whether the preform is allowed to cool after being injected, then reheated to temperature once ready to form or if the preform is kept sufficiently hot so that the reheating aspect is not needed.

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.

Pet moulding