In blow molding, hollow plastic parts are being formed through a manufacturing process that is generally categorized into three main methods, namely injection blow molding, extrusion blow molding and injection stretch blow molding. Basically, the extrusion blow molding starts with melting down the plastic and forming it into a parison—a rounded mass of molten material formed by rolling it immediately after being removed from the furnace, with its final form being a tube-like plastic that has a hole in one end that serves as a passage way for compressed air. This material is then clamped into a mold and then blown by air, of which pressure will push the plastic out in order to match the mold. Once it has cooled and hardened, the mold would open up to eject the part. In the case of injection and injection stretch blow molding, these processes use a preform, which is a piece that already has a form beforehand.
- It is a revolutionary form of technology.
Blow molding is said to have revolutionized the industrial sector by allowing companies to use it widely to meet consumers’ needs for plastic ware. As you can see, this plastic production method brought about a lot of production perks, such as quick manufacturing and high volume outputs, which means that we are able to produce a lot of plastic containers.
- It can produce a variety of products.
Most plastic containers on the market today that holds some forms of liquid has went through this process. In fact, the commonness of blow molding has allowed engineers to try and create a variety of applications and designs, which resulted to multiple interesting uses. Just to mention a few, the products created using this technology include fuel tanks, seat support for vehicles, flower pots and toy wheels.
- It comes with low costs.
With a focus on extrusion blow molding, it uses a lower level of pressure, which means that machinery costs are low, making it easier and more cost-efficient to mold external threads or open-ended and large parts, which can be split by opening a closed molding. Moreover, the use of this technology will allow you to reduce labor costs.
- It allows for multiple methods of production.
As already implied, blow molding uses various methods to create final products. For one, extrusion blow molding works similarly as traditional glass blowing, where materials are blown through a long tube to work on the end, which can create products, such as light bulbs. As for injection blow molding, it is employed to produce receptacles in huge quantities, where melted polymers are injected into the blow mold, instead of being blown through by air. Now, this technology is continuing to develop to improve such production methods, using tweaks in design and moving towards pure automation.
- It promotes a higher level of productivity.
This technology has always been moving forward with the purpose of becoming universally used with plastic production. It has allowed for a significant increase in production capabilities, allowing manufacturers to produce greater quantities in just a short period of time. Using machines that allow for 3D moldings, it has allowed for a production cycle that is much faster.
- It offers the benefits of automation.
Blow molding was taken to greater heights when the Placo X-Y machine from Japan was developed, giving rise to 3D blow molding. Basically, this is an automated production method that allows for minimal flash (excess polymer) around the material, seamless part incorporation and increased speed of production, thanks to the precise receptacle it creates.
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