Blow Molded Plastics Manufacturers and Companies

IQS Directory provides a detailed list of blow molded plastic manufacturers and suppliers. Find blow molded plastic companies that can design, engineer, and manufacture blow molded plastics to your specifications. Peruse our website to review and discover top blow molded plastic manufacturers with roll over ads and complete product descriptions. Connect with the blow molded plastic manufacturers through our hassle-free and efficient request for quote form. You are provided company profiles, website links, locations, phone numbers, product videos, and product information. Read reviews and stay informed with product new articles. Whether you are looking for manufacturers of blow molded specialties, blow molded parts, and blow molded products of every type, IQS is the premier source for you.

  • Winfield, KS

    No matter what your blow molding needs are Western Industries is ready to assist you. We believe in thinking outside the mold and using unique methods to come up with large-part blow molding solutions for our customers. We have access to state-of-the-art technology and over 100 years of combined experience serving a variety of industries. When you choose Western Industries, you have the Western Advantage. Call today for more information!

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  • Aurora, OH

    At Lerner Molded Plastics, we specialize in crafting high-quality blow molded products tailored to meet the diverse needs of our clients. With years of expertise in the industry, we take pride in our ability to deliver innovative solutions that exceed expectations.. For more information about our capabilities, contact us today!

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  • Sturgis, MI

    With blow molding presses from 1 to 80 lbs., Iceberg Molding has the ability & resources for every step of your blow molding requirements - from a competitive part quote to part & product development support start to finish. Iceberg Molding has an established infrastructure like no other. We can simply mold parts for you or completely assemble & ship your finished products anywhere in the world.

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  • Riverside, CA

    Founded in 1984, Hi-Rel Plastics & Molding, Inc. is a turn-key manufacturer who offers custom blow molding and custom plastic injection molding for a variety of industries. With more than 35 years of experience, our quality products are unparalleled. We process an almost infinite variety of thermoplastic resins, our prices are competitive, our delivery is on time, and we offer superior customer service. Our company is ISO 9001:2015, AS 9100 Rev D, 13485:2016 Certified.

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  • Valencia, CA

    Valencia Plastics is a leading edge blow molder with new methods to add value & ensure superior quality for any job from 10 grams to 3 lbs. Discover our expertise with many plastics & a wide range of machinery. Customers can expect the best from concept to end blow molded plastic product. Industries we serve include aerospace, defense, medical, commercial & pharmaceutical.

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  • Coloma, MI

    Since 1952, SPI Blow Molding has provided custom blow molding for a diverse range of industries, such as agricultural, plumbing, electronics, and more. Our team can meet your needs with a variety of plastics, such as HDPE, ABS, polycarbonate, and TPE. Secondary operations and assembly services are also available. SPI is a leader in our industry due to our customer-oriented ability to deliver successful production solutions and unmatched product quality.

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  • Centralia, ON

    EXI-plast is a full-service provider of custom plastic moulding services, specializing in blow moulded solutions for customers worldwide across a wide variety of industries. With over 30 years of experience developing, producing, and finishing custom plastic products, we have also become a sustainability leader through the integration of postconsumer resins. With products ranging from less than 1lb up to 30lbs, EXI-plast is Molding the Future!

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Blow Molded Plastics Industry Information

Blow Molded Plastics

Blow molded plastics are those hollow plastic products that have been created through the process of plastic blow molding.

Quick links to Blow Molded Plastics Information

The History of Plastic Blow Molding

The idea of plastic blow molding originally came from glassblowing, a similar process of earlier origin, and the first blow molding machine was produced around 1938. It was with such a product that, in 1939, plastic bottles were first mass-produced in the United States. However, due to limited resources in the 1940’s, blow molding did not truly become popular until later. Today, blow molded plastics are made from thermoplastics like acetal, polyamide, polystyrene, polyvinyl chloride (PVC), low density polycarbonate (LDPE), high density polycarbonate (HDPE) and polypropylene. Typically, they are characterized by thin walls and durable structures. Blow molded plastic products are quite diverse, including items such as drums, cases, containers, beverage bottles, toys and sports equipment.

Process of Extrusion Blow Molding

To create products such as these, manufacturers use three main processes associated with plastic blow molding: extrusion blow molding, injection blow molding and injection stretch blow molding. In extrusion blow molding (EBM), before the process begins, manufacturers take raw plastic resin, melt it down and form it into a hollow cylinder known as a parison. To kick things off, the parison is clamped into a mold, where a blow pin forces compressed air into it and it expands until it fills out the mold cavity, taking on its shape. Once it reaches its intended shape and size, the plastic is allowed to cool, typically with the aid of conduction, and harden. The last step is to remove it from the mold, which may or may not be done with the help of ejector pins. Extrusion blow molding produces the vast majority of blow molded plastics.

Injection Blow Molding Process

Next, injection blow molding (IBM) is performed in three main segments: injection, blowing and ejection. First, a molten polymer is fed into a hot runner manifold and injected via nozzles into a heated cavity and onto a core pin. The polymer surrounding the pin takes on the shape of the cavity, forming an exterior, while the core pin ensures that it remains hollow. Second, this pin rotates its way to a blow molding station, where the mold is clamped around a core rod, inflated inside a preform and cooled. Lastly, once hardened, the finished product is moved into the ejection position and stripped off the core rod. Note that injection blow molding is the least commonly utilized plastic blow molding process and is only used to create small capacity bottles and jars. Its infrequent usage is due to the fact that it is difficult to control the base center during the blowing process. Also, using this method, handles cannot be added and barrier strength cannot be increased.

Plastic Blow Molding Images and Illustrations

blow molding machine
The blow molding machine compresses the air then inflates the preform until the plastic is molded according to the profile.
parison extrusion
This process is the preparation of the parison or preform to be inflated
extrusion blow molding
Extrusion blow molding involves the extrusion of a parison with a predetermined length which is held by a split the die on the ends, which is sealed on one end while the other end is fitted to an air supply.
injection blow molding
Injection blow molding combines the same attributes for injection molding and blow molding by using the injection molding then blowing the plastic into shape.
injection stretch blow molding
A modified version of the injection blow molding process involving stretching the plastic with a pull rod, enclose the plastic with a die, and then is inflated to the shape.

Injection Stretch Blow Molding Process

The final blow molding process, injection stretch blow molding, works quite similarly to injection blow molding. The main way in which it differs from the former is its use of bottle-shaped preforms. Note that injection stretch blow molding can be carried out using one of two methods: single-stage or two-stage. In the first method, both the preform and the bottle are blown in the same machine. In the second method, the preforms are created first, using the injection molding process, then they are later reheated and stretched into their intended shape and size. The latter step is done using pressurized air and core rods, which help the preforms stretch properly. Stretch blow molding is known for producing very high volumes of oval, rectangular or cylindrical bottles. Also, generally speaking, this process impedes bottle design very little. However, it does create somewhat high costs and it requires a larger amount of floor space than most.

Air Flow and Blow Molding

When performed properly, plastic blow molding processes yield plastic products with fairly long lifespans. The key to well-made blow molded plastics is air flow: in order to create strong, uniform walls, manufacturers must take care to apply pressurized air in a controlled and constant stream. This ensures even expansion. The inconsistent application of air would lead to varying wall thicknesses, which would likely result in products with diminished durability and strength. Per the request of their customers, manufacturers can affordably create products of different shapes, sizes and capabilities. They can even inject colors into the plastic before it is formed, without compromising their fast turnaround times. Plastic manufacturers are eager to collaborate; reach out to them today to find out more.

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Blow Molded Plastics Informational Video