PT ZONE: Blow Molding

PT Article Something New for PET: Injection-Compression-Stretch-Blow Molding
Continuous, rotary injection-compression molding of preforms is linked to rotary stretch-blow molding. More (+)
PT Article Planning on Investing in Equipment? Best Be Decisive
Gardner’s capital-spending survey results project a big uptick in equipment investment this year. But processors who dawdle might not be able to buy what they want. More (+)


Amcor Wins Race for Hot-Fill PET with Metal Lug Closure

Consumers get the reassuring "pop" of freshness without the weight and fragility of glass.

Commodity Resin Prices Heading Down

Falling global feedstock costs and demand destruction concerns are forcing prices downward.

Growth Continues, Slowly

Processing market grows for the 11th month out of 12.

Why Processors Are Rediscovering Liquid Colorants

In extrusion, injection, and blow molding, liquid color is enjoying something of a renaissance. Cost is one reason, but advances in pigments, carriers, delivery systems, and innovative service programs have played a role too.

How to Address Uneven Wall Thickness in Stretch-Blow Molding

Many conditions must be met to get the best wall distribution in a PET bottle. Skilled operators are, as always, indispensable.

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Blow Molding


In blow molding, material is melted then formed to create a hollow part. There are various types of blow molding: extrusion blow molding; injection blow molding; and stretch blow molding. Blow molded products can be broadly classified into packaging (such as soda bottles) or industrial (like fuel tanks).

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» Purging Compound

Sooner or later you will need to purge your machine. Which material should you use to purge your screw and barrel?

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