Plastic Blow Molding

Plastic Blow Molding

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 gallons to just a few ounces with a variety of finishes. This equipment allows us to construct plastic blow molded products ranging from medical, consumer, and industrial applications. Our company offers numerous types of resins, ranging from High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), Polypropylene (PP), K-Resin, PETG, and Polystyrene (PS) to name a few.

So how does blow molding exactly work? Blow molding is a manufacturing process is which your selected material (in this case, plastic resin), is melted and hollowed out. Once hollow, it’s formed into tube of plastic (parison). 

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. The part is ejected once the plastic is cooled and hardened. The part is then trimmed to remove flash and other secondary operators.

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, bottles, cans, and industrial parts such as drums.

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.

At Blow Molded Products, we are able to customize your products to your liking and we ensure a high attention to quality and detail from beginning to end.

Our highly skilled engineers are ready to meet all your plastic blow molding needs with exceptional value and economical prices. Call us today for all of your plastic blow molding needs!