Blow molding is used in the manufacture of hollow plastic parts, creating common components like PET bottles, HDPE jugs, and jerry cans. Variations on the process include extrusion blow molding (EBM), injection blow molding (IBM), and injection stretch blow molding (ISBM).

Avoid Four Common Traps In Granulation

Today, more than ever, granulation is an important step in the total production process. Our expert explains a few of the many common traps to avoid when thinking about granulators

Blow Molding: Essential Reading

Understanding the ‘Science’ of Color

And as with all sciences, there are fundamentals that must be considered to do color right. Here’s a helpful start.

Solve Four Common Problems in PET Stretch-Blow Molding

Here’s a quick guide to fixing four nettlesome problems in processing PET bottles.

Best Practices in Processing with Recycled Material

Inside: What brand owners are planning, and how processors ahead of the curve have already responded.

SPE Schedules First-Ever 'Virtual' ANTEC

Attendees can listen to keynotes and presentations live. Many presentations will also be recorded.

Use a DOE to Improve Consistency of Your Resin-Drying Process

Conducting a drying design of experiments (DOE) will ensure your polymer is properly dried every time. Here’s how to do it.  


FAQ: Blow Molding

What Are Common PET Stretch-Blow Molding Problems and How Can I Fix Them?

Common problems:

1. Pearlescence and haze

2. Insufficient top-load strength

3. Insufficient base clearance or rocker bottom

4. Drop-impact failure



How to Fix Uneven Wall Thickness in Stretch Blow Molding?

There are a number of conditions that must be maintained in order to achieve the described result. Following are the various issues that can skew wall thickness, in order of relevance:

Off-center gate

Uneven heating or cooling

Small stretch ratios

Part failure along the parting line is related to material processing conditions, parison geometry, molding conditions, mold design, or a combination of these factors. Developing the optimal material shape inside the part at the pinch-off is a key to building parting-line integrity.


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