Blow molding is a manufacturing process that uses air to inflate soft plastic into a mold cavity. This process is used to create a wide range of thin-walled, hollow plastic products that are used in everyday life, such as:

  • Parts for dishwashers, washing machines, ovens/stoves
  • Automobile parts (such as dashboard panels, exterior side panels, fuel tanks &  more)
  • Toys & Pet Toys 
  • Plastic Containers
  • Aircraft & Aviation parts

Types of Blow Molding

There are three different types of blow molding: extrusion blow molding, injection stretch blow molding, and injection blow molding.

Extrusion Blow Molding

During the extrusion blow molding process, plastic is melted and formed into a tube, known as a parison. The manufacturer blows hot air into the parison, inflating it into a hollow part based on the shape of the mold. Once the plastic cools, the molded part is ejected and replaced with a new parison to start the process over again. Examples of products created with extrusion blow molding include jars, containers, and plastic bottles.

Injection Stretch Blow Molding

The injection stretch blow molding process follows the same steps as injection blow molding to create a preform. Once the preform is heated to the right temperature, it gets stretched and infused with air until it reaches its final shape. Once the part cools, it is then discharged. Products that are typically made with injection stretch blow molding include soft drink bottles, cooking oil containers, personal care product bottles, and chemical containers. 

Injection Blow Molding

The injection blow molding process begins by creating a preform. The plastic material is injection molded into a heated cavity and onto a core pin. The cavity forms the outer shape of the part, while the core rod shapes the inside of the preform. The preform is typically shaped like a bottle or jar neck with a large amount of polymer attached to it. Once the preform is created, it is taken to the blow station where the core rod compresses air into it to form its final shape. The part is then cooled and ejected. This type of blow molding is often used to create very small containers for hospitality samples and pharmaceuticals.

At OMICO Plastics, we specialize in providing superior extrusion blow molding services. We are capable of producing extrusion blow molding products for industries such as appliances, automotive, children’s and pet toys, and lawn and garden equipment.

Blow Molded Products

Extrusion blow molding offers a range of benefits that make it well-suited to create various everyday products. These benefits include:

  • Versatility
  • Durability
  • Customizability
  • Lightweight
  • Cost-effectiveness 

These advantages make extrusion blow molding ideal for creating products across a range of applications, such as:

  • Appliances. Extrusion blow molding is capable of producing reliable and durable components for home appliances such as dishwashers, washing machines, and refrigerators.
  • Children’s toys. Plastic blow molding products can be created in a wide range of colors, making the process a great option for children’s toys. Extrusion blow molding can be used to create blocks, squeeze toys, toy truck shells, play structures, and more.
  • Automotive parts. Blow molding creates parts that are reliable, cost-effective, and won’t rust or corrode. Extrusion blow molding can create various automotive parts such as fuel tanks, cooling system parts, and parts that store fluid.
  • Lawn equipment. Products made by blow molding offer reduced weight and resistance to the elements, making them an ideal option for fuel tanks and fluid reservoirs for lawnmowers, pressure washers, and other lawn equipment.
  • Pet toys. Blow molding offers a great way to create durable, long-lasting, and easy to clean pet toys.
  • Miscellaneous. Extrusion blow molding can be used to create wheels, blow-molded containers, coolers, and more.

Extrusion Blow Molding from OMICO Plastics

At OMICO Plastics, we have over 50 years of experience providing top-quality extrusion blow molding services for customers in a range of industries. To learn more about our capabilities, or to get started on your custom blow molded parts, contact us today.