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The Extrusion Blow Molding Process in Plastic Bottle Production

Blow molded products are all around us. From water bottles to carrying cases for power tools, blow molding is a fast, efficient, and inexpensive way to manufacture many of the things we use every day.

Processes to Plastic Bottle Blow Molding

There are four different blow molding processes used to produce plastic containers and bottles: injection blow molding, stretch blow molding, reheat and blow molding, and extrusion blow molding. Of all the processes, the least complicated is perhaps extrusion blow molding. It is also among the most versatile and cost effective ways to produce a vast array of different products.

Extrusion Blow Molding Production

In extrusion blow molding production, a tube of hot plastic called a parison is extruded into a mold that has been water cooled. The mold is then closed and air is blown into the tube to inflate it to the dimensions of the mold. Once the hot plastic hits the cooled mold, it “freezes” and maintains the shape of the mold.

Extrusion blow molding is generally considered to be the most versatile of all the blow molding processes because it allows for a much wider variety of sizes, shapes, handles, and neck openings. Injection blow molding on the other hand, is suitable only for smaller containers with no handle ware involved. Extrusion blow molding products can be produced at a lesser cost in part because the molds are much less expensive to produce and can be made in a much shorter time span.

Blow Molding Products Produced with the Extrusion Process

Western Case Inc. produces a vast array of extrusion blow molded products, from reservoirs and tanks, to toys and sporting goods. Our manufacturing and engineering teamwork closely with each client to assure that their needs are met and even exceeded. Providing quality blow molded products around the world, pride ourselves on placing customer satisfaction at the top of our list of priorities.

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