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Extrusion Blow Molding

A reliable source for Extrusion Blow Molding information and a resource for accessing leading Extrusion Blow Molding and suppliers.

Extrusion blow molding bottles are made to hold beverages like juice and pop, liquid soap, detergent, and motor oil for consumer and industrial applications within the food and beverage, automotive, cleaning products, medical, cosmetics, and drinking water industries. Read More…

Extrusion Blow Molding Informational Video

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Leading Manufacturers

Winfield, KS  |  620-221-9464

No matter what your blow molding request, Western Industries is ready to assist you. We believe in thinking outside the mold, and using unique methods to come up with 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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Western Industries Plastic Products LLC $$$

Riverside, CA  |  951-360-6055

At Blow Molded Products, we have experience doing custom blow molding for a multitude of industries, including furniture, sporting goods, health and safety, electronics, and more.

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Blow Molded Products $$$

Sturgis, MI  |  269-651-9488

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.

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Iceberg Molding $$$

Riverside, CA  |  951-354-0258

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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Hi-Rel Plastics & Molding $$$

Mayodan, NC  |  336-949-4107

Since 2009, Blow Molded Solutions has been a leader in the blow molding plastic industry. Our expert team works alongside our customers to ensure that our products meet their needs. We are committed to manufacturing high-quality products that meet and exceed the customer's expectations.

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Blow Molded Solutions $$$

Coloma, MI  |  269-849-3200

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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SPI Blow Molding LLC $$$
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What is Extrusion Blow Molding?

Extrusion blow molding bottles are made to hold beverages like juice and pop, liquid soap, detergent, and motor oil for consumer and industrial applications within the food and beverage, automotive, cleaning products, medical, cosmetics, and drinking water industries.

They are extruded into two mirror molds and have a visible seam dividing the bottle in half. Compared to other blow molding processes, extrusion blow molding generates little waste, all of which is recyclable. In addition, blow molding is distinguished by the hollow tube extruded from the machine to form the pieces.

The name for this tube is a parison. The parison is subsequently encased in a hollow mold, which cycles to the blow station. While another parison is being extruded from the machine, the parison within the mold is molded using air pressure at the blow station, resulting in a shorter cycle time.

Parison Extrusion

Extrusion Blow Molding Process

Extrusion blow molding begins with the formation of a parison, which is a plastic tubular preform. Plastic pellets are loaded into a hopper and fed into an extruder screw with a heating unit. As the pellets pass through the screw, they become molten and are pumped toward the die head.

The liquid plastic flows horizontally and then downward and emerges as a soft tube preform. The preform, called a parison, is then extruded by compressed air as two molds simultaneously come together to form a cavity in the shape of the container. The plastic balloons out and is stretched thin into the mold cavity, taking its shape.

The mold cavity is then chilled by cold water running through the molds. The newly formed part will always have a seam where the two mirror molds came together and a small point at the bottom where the plastic balloon started.

Some parts may have excess plastic that needs trimming from the neck or parting lines. The newly formed plastic parts are then put through post forming operations, including drilling, die cutting, milling, painting, and adding decals or labels.

Each container or part only takes a few seconds to form and may be done in high volumes. Therefore, they are formed in a continuous or intermittent method.

Extrusion Blow Molding

Machines Used in Extrusion Blow Molding

The two-station and continuous machines are the two types of extrusion blow molding machines. A two-station machine, often known as a "shuttle," moves a common mold back and forth between the extruding parison and the blow station. A continuous, or "wheel," machine continuously produces parts using similar molds.

Larger pieces may be produced using extrusion blow molding than injection blow molding. It's also less expensive, and the part has no internal tensions. However, when utilizing extrusion blow molding, more scrap is created, and there is less control over the correctness of crucial dimensions.

Blow Molding Machine

Advantages of Extrusion Blow Molding

  • Compared to IBM, EBM offers benefits such as lower tooling costs and the inclusion of blown handle-ware, among others.
  • One of the key advantages of IBM is that there is no flash or scrap during processing. It provides the best of all wall thicknesses and plastic distribution control, as well as the ability to mold key bottleneck finishes more precisely. After blowing the plastic melt, the initial IBM preforming cavities are constructed to have the exact dimensions required, accounting for any shrinkage, etc., that may occur. Internal and external neck finishes can be molded with a precision of at least four mil (0.10 mm). It also provides precise weight control in the completed product to within 0.1 g.

Disadvantages of Extrusion Blow Molding

  • Controlling parison swell, creating scrap, limited wall thickness control, and plastic distribution could all be disadvantages or restrictions. Blown solid handles can be formed during the BM process if needed. For some designed molds, trimming can be done in the mold, or supplementary trimming processes can be added to the production lines. Scrap is considerably decreased while using 3-D molding.
  • Other disadvantages include high tooling costs and the limit to solid handle-ware. In addition, it was previously believed that extrusion blown products were limited to extremely small products (however, large and complex products were fabricated once the market developed).

Extrusion Blow Molding Informational Video

 

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