machine to make plastic molds

Plastic Blow Molding Services

If you’ve been searching for professional plastic blow molding services, you’ve come to the right place. Our diverse facilities allow us to blow mold containers ranging from 35 lbs. to just a few ounces with a variety of finishes. Our equipment allows us to manufacture plastic blow molded products ranging from medical and consumer goods, to containers, automotive and industrial applications. Our company offers numerous types of resins, ranging from commodity resin such as High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), Polypropylene (PP), and engineering resin such as K-Resin, PETG, and Polycarbonate, to name a few.

FAQs about Plastic Blow Molding

What is Blow Molding Plastic?

Blow molding is a manufacturing process in which plastic resin is melted, hollowed out, and formed into the desired size and shape.

How Does a Blow Molding Machine Work?

Blow molding machines may seem complicated (and many of them are!), but most of them work by following these steps:

  1. Plastic is fed through a hopper or screw depending on the type of machine.
  2. Plastic is superheated beyond its melting point, fed through a parison (see below to learn what that is), and clamped in place.
  3. The machine uses compressed air to inflate the parison.
  4. Heated plastic balloons then fill the mold space.
  5. After the plastic is cool, the technician opens the mold, removes the part, and sends it on to the next step.

What is a parison in blow molding?

The parison is a tube-like plastic piece that allows compressed air to travel through, pushing the plastic out to match the mold of your designed piece.

What plastic is most used for blow molding?

Some of the most common plastics used in blow molding include ABS, high- and low-density polyethylene, and commodity grades resin such as LLPE, HPDE, PP, and engineer resin grades ABS, PC, and Elastomers. To see an even longer list of plastics commonly used, check out our What is Blow Molding informational page.

Extrusion Blow Molding

The extrusion blow molding process entails melting the plastic and extruding it into a parison. The parison is captured and secured to a cooled aluminum mold where compressed air is injected; inflating the plastic into the shape of a hollow bottle, container or part. Many parts constructed by the extrusion blow molding process include most polyethylene or plastic hollow products, custom plastic bottles, cans, and industrial parts such as drums.

blow molded plastic products

Often, the process of plastic blow molding products may include hand trimming, where plastic products have an excess of material due to the extrusion blow molding process. The excess layer of material is trimmed off by a precision knife around the plastic product to cut the excess material away. The excess plastic material is then recycled and reused to create new moldings. Spin trimmers are commonly used on materials such as HDPE, PE, and LDPE to trim a neck finish.

Before we begin the extrusion blow molding process, we take into consideration the important factors of polymer viscosity, melting point and strength, strain recovery, specified crystallization rates, and thermal properties. One of our most popular plastic resins chosen for plastic bottles is high density polyethylene (HDPE). This type of material is economical, resistant to impact, and provides a good moisture barrier that is compatible with different types of acids and caustics. HDPE is most commonly used in FDA-approved food grade products due to its rigid properties.

Custom Blow Molded Product Design & Production

Are you looking for a custom product for a short run? No problem, short or long runs of custom products are easily accommodated. How about those tough products with double walls and irregular parting lines? Bring ’em on. Blow Molded Products has a history of successfully making those parts others won’t even attempt. Is product quality your number one priority? No worries here—from design to finish, the accent on quality details is what sets Blow Molded Products apart.

Blow Molded Products’ experience in blow molding allows us to design and manufacture those tough jobs others can’t. From conception to completion, Blow Molded Products’ team of experts will turn your design into a finished product you can be proud of. And, all of this done under one roof—giving you excellent results at affordable prices.

blow molded plastic products

Some of the Markets & Industries We Serve:

  • Automotive
  • Consumer
  • Electronics
  • Fuel Oil Tanks
  • Furniture
  • Health & Safety
  • Lawn & Garden
  • Marine
  • Medical
  • Packaging
  • Point Of Sale Displays
  • Recreational
  • Seating
  • Sporting Goods
  • Toys

Blow molded products

Our vast expertise also allows us to easily run traditional single wall parts. Whether we design and build your mold or use your existing tooling, you can count on the highest quality products, on time delivery—all at reasonable prices.