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).

NPE

Manual Leak Tester and Vision Option

NPE2024: New from ALPS Inspection are the affordable BenchPlus manual leak tester and a vision option to add defect detection to leak testers.

ESSENTIAL READING

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Packaging 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.

processing tips 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.

technology in action 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.

Barrier 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.

Latest Blow Molding News And Updates

Packaging 22 Mar 2024

Advanced Inspection of Bottles and Labels

NPE2024: Intravis shows new system for full label inspection on round, randomly oriented bottles; and redesigned bottle inspection system with more modular design.

NPE 1 Mar 2024

All-Electric Shuttle and Stretch-Blow Machines

NPE2024: Meccanoplastica shows off a double-sided shuttle for containers up to 5 L and a reheat stretch-blow molder for up to 2.5 L PET containers with four cavities — both all-electric.

Packaging 28 Feb 2024

New 15-Ton, All-Electric Shuttle

NPE2024: Plastiblow demonstrates double-station, quad-head machine making 500-ml HDPE bottles.

NPE 27 Feb 2024

Large Recip-Screw Machine Boasts Numerous Upgrades

Rocheleau adds side-shift option, new controls and diagnostics to its RS-90 unit.

NPE 23 Feb 2024

High-Output Drum Machine Boasts Fast Cooling, Color Change

NPE2024: Graham Engineering’s new 40-lb accumulator press has adjustable-height extruder platform.

NPE 16 Feb 2024

Midsize Electric Shuttle Blow Molder Balances Flexibility, Compactness

NPE2024: New Magic EBM model is loaded with features for the U.S. market.

Orbetron new for 2024 micro twin screw feeder

New Tinius Olsen VectorExtensometer testing

Featured Posts

Stretch Blow Molding 11 Mar 2024

At NPE, Cypet to Show Latest Achievements in Large PET Containers

Maker of one-stage ISBM machines will show off new sizes and styles of handled and stackable PET containers, including novel interlocking products.

Injection Molding 16 Feb 2024

In the Zone: Bottles

The Bottle Zone is the place to explore cutting-edge bottle and container technologies.

Packaging 14 Feb 2024

Get Color Changes Right In Extrusion Blow Molding

Follow these best practices to minimize loss of time, material and labor during color changes in molding containers from bottles to jerrycans. The authors explore what this means for each step of the process, from raw-material infeed to handling and reprocessing tails and trim.

Blow Molding 5 Jan 2024

Use Interactive Production Scheduling to Improve Your Plant's Efficiencies

When evaluating ERP solutions, consider the power of interactive production scheduling to effectively plan and allocate primary and secondary equipment, materials and resources on the overall production capacity of the business and conclude that this is a key area that cannot be overlooked.

Packaging 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.

Blow Molding 16 Aug 2023

Foam-Core Multilayer Blow Molding: How It’s Done

Learn here how to take advantage of new lightweighting and recycle utilization opportunities in consumer packaging, thanks to a collaboration of leaders in microcellular foaming and multilayer head design.

Shell Polymers (Real)ationships start here ad

Guill - World Leader in Extrusion Tooling

Processing additives for Plastics recycling stream

Mold Cooling Visibility with TracerVM Flow Meters

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.