In this article, we are going to put the process of blow molding for producing plastic parts under the magnifying glass and identify the best machines to use for this process. This piece is intended to help end users make the best decisions when in they&#;re in the market for a Blow Molding Machine based on the type and/or shape of the product they&#;re making.
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How Blow Molding Works
First, let's review the blow molding process as a whole. Blow molding is a specific process by which hollow plastic parts are formed. Much like blowing up a balloon, plastic materials are heated and then filled with air to force them to conform to the shape of a mold. Hollow glass products like bottles are also formed this way, but let's just stick to plastic for now.
The process usually begins by injection molding: melting down the plastic and forming it in a mold, what is called a &#;preform.&#; After preforming the part, it is transferred to a blow molder wherein the part is mounted in another mold or &#;injection case,&#; heated to soften the material again, and then has air blown into it&#;pushing the now soft and elastic plastic outward to match the &#;mold.&#; The mold is basically the final shape of the desired part.
The two main types of machines that perform this process are extrusion blow molding machines and injection blow molding machines. They both operate in similar ways to create your product but have different advantages and disadvantages regarding production.
Extrusion Blow Molding Machines
Extrusion blow molders melt the plastic and &#;extrude&#; it into the injection case to then be clamped together by the platens and form the desired shape. Extrusion simply means to &#;squeeze&#; the melted plastic out. Think of your tube of toothpaste. When you squeeze out a portion, you are extruding the toothpaste out of the tube. Once the plastic is molded into the shape and cooled off sufficiently, the part is then ejected and your machine is ready to start the process over again. Examples of products made through this process include milk jugs, shampoo bottles, and various automotive parts like the air intake tubing on your truck.
Advantages of extrusion blow molding Machines include low tool and die cost, faster production rates, and the ability to mold complex parts with ease.
Disadvantages of this type of blow molding include low strength of your plastic products and the fact that it is limited to manufacturing hollow parts only.
Injection Blow Molding Machines
Injection blow molding machines utilize the barrel and screw assembly that melts the plastic and injects it into a heated cavity and core pin, which looks quite similar to a test tube. The cavity mold forms the outside shape of the product and is clamped around a core rod, forming the inside of the product. It is then inflated with compressed air to match the mold and cooled. Once the product is cooled, it is then ejected and your machine is ready to begin the process again. This process is primarily used to make small medical tubes and single serving bottles.
Advantages of injection blow molding is that the finished product is more accurate, hence the focus on producing items for the medical field.
Disadvantages are that this process only suitable only for small capacity bottles and handles cannot be made (like the handle on your milk jug).
Southern Fabricating Machinery Sales has many options for machinery that fall into these categories and can help your blow molding operation be successful. For more information on the machines currently in our inventory, give us a call or check out our website today to learn more about blow molding and many other manufacturing processes.
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For manufacturing plastic bottles, experts rely on a state-of-the-art blow molding machine. With this particular process, a manufacturer produces a broad range of finished products in varying sizes and shapes. Because of that, multiple industries depend on a professional company to make a specific type of plastic bottle needed.
However, a top manufacturer uses a blow molding machine for producing a lot more than just plastic bottles. Although that is the primary function, blow molding machinery is ideal for other products. With different types of plastics available for this process, a skilled manufacturer can serve all kinds of businesses with standard and customized requests.
Plastic for Blow Molding Machinery
Following are some examples of the best plastics used with a blow molding machine. Keep in mind that because each has unique properties, it is imperative the customer work with a manufacturer with extensive knowledge of the various options available, thereby selecting the correct plastic for the product.
- High-density Polyethylene (HDPE) &#; Of all the materials used with blow molding machinery, this is the most common. Used to create bottles for different applications, not only is HDPE durable but also one of the safest plastics available.
- Polyethylene Terephthalate (PET) &#; As a type of polyester, companies use PET to manufacture clear bottles.
- Polypropylene (PP) &#; As another popular plastic, PP has excellent stiffness and low-density, making it perfect for high-temperature applications. Although translucent, a manufacturer can color it.
- Polycarbonate (PC) &#; As a clear and strong material, PC works great for producing plastic bottles, especially those with complex shapes.
Reaching Beyond Plastic Bottles
Every day, you either see or handle plastic bottles used for things like water, soda, cleaning products, and so on. However, blow molding machinery can produce far more than just bottles. Using the same materials listed, plus a few extra, a manufacturer has the capabilities to produce products for all types of industries and applications. Here are two examples:
- HDPE &#; With this plastic, manufacturers produce containers for antifreeze, motor oil, and shampoo. However, HDPW is also the material of choice for producing industrial drums, fuel tanks, and other larger items.
- PC &#; This material makes a perfect choice for anything that requires extreme strength, including bulletproof glass. However, manufacturers also use it to make 5-gallon water containers and eyeglasses.
With a blow molding machine, a company can make plastic specimen containers and tubing used by the medical sector, watering cans for avid gardeners, jars that hold soup, peanut butter, and an assortment of other foods, and makeup cases and containers for the cosmetics industry, among many others.
Selecting a Reputable Blow Molding Machine Manufacturer
For your company to produce stellar products that meet strict criteria, you need top-of-the-line machinery. That means turning to an experienced blow molding machine manufacturer like PET All Manufacturing. We provide our customers with only the most advanced machines available. Whether you need to produce bottles or some other type of plastic product, you can count on us to deliver excellent machinery.
Want more information on Blow Molding Systems? Feel free to contact us.
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