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Injection Blow Molding

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

Injection blow molding (IBM) is identical to extrusion blow molding, except that the parison is created around a core rod or metal shank by an injection molding process. The parison comprises a fully formed bottle/jar neck and a thick polymer tube serving as the bottle’s body. Read More…

Injection Blow Molding Injection blow molding is a two step process that uses a mandrel to form the preform, and a blow molding machine to form it into a plastic container. Thermoplastics like high density and low density polyethylene, polycarbonate, polypropylene, polyvinyl chloride, Barex and polyethylene terephthalate are all used in injection blow molding to produce containers like tanks, jars and bottles.
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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 Injection Blow Molding?

Injection blow molding (IBM) is identical to extrusion blow molding, except that the parison is created around a core rod or metal shank by an injection molding process. The parison comprises a fully formed bottle/jar neck and a thick polymer tube serving as the bottle's body.

Injection blow molding is a procedure that combines several different techniques. First, a preform is injection molded and then blown into the desired shape, necessitating the use of two molds: one for the preform and one for the final blown form.

For large-scale production of hollow things, injection blow molding is used. Bottles, jars, and other containers are the most common applications. Unlike extrusion blow molding, injection blow molding provides better aesthetic and dimensional quality bottles.

Plastic Bottles

Injection Blow Molding Process

Since it is essentially two forming processes combined into one, injection blow molding involves more steps than other forms of blow molding. First, a parison made of plastic is formed when a thermoplastic preform is heated to molten form and injected around a hollow mandrel called a blow stem.

Once semi-cured but still soft and formable, the newly formed parison, which is still around the stem, is placed into the blow molding chamber. The steel blow stem then extends, forcing the plastic to elongate to the desired size of the product, which will also increase its overall strength.

Then, compressed air is injected through the hollow blow stem and into the parison. The almost-molten plastic inflates like a balloon and is blown against the walls of the mold cavity, taking its shape.

After it cools and hardens, the newly formed plastic container is ejected from the mold. It exhibits a seamless design and does not need to be trimmed. Injection blow molding machines use multiple mandrels and may form up to 12 containers simultaneously.

Injection Blow Molding

Injection Blow Molding Machines

When selecting an injection blow molding machine, there are three primary considerations. The first is the plastifier's capacity to plasticize enough plastic material to achieve maximum cavitation.

Because the IBM machine's cycles are quite fast, the plastifier's recovery time can be a limiting issue regarding how many cavities can be made or how quickly a cycle can be used in production.

The second factor is the clamp tonnage capacity of the injection station. Clamp tonnage is computed by multiplying the predicted area of the preform as it is cut on the horizontal plane by the number of cavities and the injection pressure required to fill the parison injection mold with thermoplastic material.

Injection pressures for LDPE, HDPE, and PP are typically 3000–5000 psi, but injection pressures for PVC, polycarbonate, and PET can be as high as 8000–10,000 psi. With an injection clamp ranging from 5 to 180 tons and a hydraulically actuated clamp, injection blow molding machines are offered.

The dry cycle, or the time it takes for the mold to open, index the table, and close, is the third significant consideration when choosing an IBM machine. This cycle wastes time for the consumer and should be kept to a bare minimum. Machines with a 1.5-second open, index, and closure time are available, whereas others require 2.7 seconds.

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Advantages of Injection Blow Molding

  • There should be no scrap with the right tool and a well-managed shop. In the mold, all of the bottles are completely finished. Scrap is generated during the startup process and due to color mixing problems. Re-run junk does not affect the process.
  • During cavity filling, the injection blow receives some orientation from the injection stage. Also, because the temperature of plastic drops by roughly 150 degrees, styrene orients into a strong container. There is no influence on P.E.
  • When employing transparent materials, containers are always clear because some orientation happens during blow-up in the hoop direction, and polypropylene is clearer.
  • With retractable bottom plugs in the blow mold, there is a lot of creative freedom for bottom forms.
  • Accuracy is great for plug inserts for squeeze bottles or cap seals for flexible materials (nose or deodorant spray).

Injection Blow Molding Informational Video

 

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