Blow Molding

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).

Blow Molding

Uniloy Enhances Parts E-Store

Online ordering has been expanded to include parts for shuttle blow molding machines, keyword searching and same-day shipping.

ESSENTIAL READING

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Biopolymers 21 Aug 2023

How to Extrusion Blow Mold PHA/PLA Blends

You need to pay attention to the inherent characteristics of biopolymers PHA/PLA materials when setting process parameters to realize better and more consistent outcomes.

Postconsumer 11 Nov 2022

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

Injection Molding 22 Oct 2022

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.

Packaging 26 Jun 2022

Solve Four Common Problems in PET Stretch-Blow Molding

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

Purging Compounds 1 Nov 2019

Follow These Steps to Purge Accumulator-Head Blow Molders

Preventive purging with a commercial product between resins or colors and during normal shutdown and startup cycles can prevent excessive loss of resin and production time.

Stretch Blow Molding 19 Oct 2016

What Blow Molders Say About All-Electric Machines

They are well established in Europe, but molders in North America are just beginning to come around to all-electrics’ improved performance, maintenance, cleanliness, and—yes— energy efficiency. Here’s first-hand testimony, from the U.S. and abroad.

Change molds faster with Smartflow FasTie Tie-In

Latest Blow Molding News And Updates

Packaging 29 Sep 2025

K 2025: New Hybrid ISBM Machine Offers Upgrades for HDPE Bottles

Nissei ASB introduces hybrid version of ASB 70DPH machine that offers greater productivity and design freedom for HDPE bottles.

Recycled Materials 26 Sep 2025

PET Bottle Design Combines Super Light Weight With Premium Aesthetics

KHS adopts a “premium lightweight approach” with its new 0.25-L KHS Premium Lite PET bottle for still water.

Additives 24 Sep 2025

Dow Announces Alternative to Fluoropolymer Polymer Processing Aids

Dowsil 5-1050 PPA for film packaging.

PET 12 Sep 2025

Sidel Launches ‘Game-Changing’ Laser Heating for PET Preforms

“World’s-first” technology promises higher quality and productivity, lightweighting and lower maintenance.

Blow Molding 8 Sep 2025

K 2025: Workhorse Shuttle Machine Updated for Remote Diagnostics

Tahara adds internet connectivity to its most popular electric machine.

k show 28 Aug 2025

Economical Electric Machines, Expanded Services from Bekum at K 2025

Line of all-electric extrusion-blow machines boasts lower cost of acquisition and ownership while company expands services for non-Bekum machines.

Glycon: Run with the leaders in High Performance

Featured Posts

Blow Molding 23 Sep 2025

Stepping Into a New Role: Sustainability Director at a Blow Molding Company

What does it mean to take on a relatively rare job title at a midsize blow molding firm? About a year in, Stephanie von Vultee explains how her position promotes the interests of her employer and its customers.

k show 9 Sep 2025

K 2025: Commercial Debut of Parison-Shaping System Said To Be Simpler, Less Expensive, More Versatile

Tahara will demonstrate the first commercial version of the GWDS parison-shaping system for complex parts, boasting numerous advantages over popular PWDS devices.

Stretch Blow Molding 1 Aug 2025

Blow Molder Packs Sustainability Into Every Container

With back-to-back EcoVadis platinum recognitions, Ring Container Technologies is a sustainability frontrunner. PT toured the company’s Fontana, California, blow molding facility to see what it takes to be an eco-conscious producer of plastics packaging.

Packaging 13 Jun 2025

Blow Molder’s Packing & Shipping Upgrades Save Bottle Customer Over $90,000

Currier Plastics’ continuous improvement program brought new efficiencies in processing, packaging and shipping for the molder and for a bottle customer.

Packaging 10 Feb 2025

Is There a Better Way to Heat PET Preforms for Stretch-Blow Molding?

Is near-infrared (NIR) heating better, faster and more energy efficient? So far, only two machine builders are making such claims for NIR in place of standard mid-infrared preform heating, though their systems appear to be well accepted. Meanwhile, an altogether different alternative is in the works.

Blow Molding 10 Jan 2025

PolyJohn Turns to Blow Molding, Doubles Its Productivity

Leading maker of portable sanitation products knew thermoforming, sheet extrusion, rotomolding and injection molding. Then it found the missing link to higher productivity and new markets: blow molding.

Imperial Industries welded resin storage silos

Biodegradable CFAs Molding and Extrusion

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

Fixes: https://www.ptonline.com/articles/solving-four-common-problems-in-pet-stretch-blow-molding

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

How to Fix Pinch-Off Failures?

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.