When Plastics Need Memory

 

Hard Drive
5 MB of memory in 1956

When we speak of memory in plastic materials, we are talking about a plastic parts ability to return to its original shape after it is deformed in some way. More specifically, we are talking about a part being able to return to its original shape after being held in a flexed position for an extended period of time.

The question is, what makes a material have good memory and what materials are best used for applications that require this property?

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News Digest Week of 7/18/2016

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Plastics remain material of choice for inject-able drug packaging

Chase Plastics sets up Mexican subsidiary

Spot PE and PP prices firming up

DuPont starts up mega-compounding plant in Shenzhen China

Austrian family tries to live without plastics for one year to prove health benefits

Sonoco ramping up production of plastic cans

Polymer based flexible hose market to reach 500 million kg by 2020

DSM’s EcoPaXX provides high hydrolysis resistance for automotive cooling systems

If you want to know why you should not use hydrolysis resistant nylon, read here

 

Understanding Nylon and Moisture

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Nylon is one of the oldest and most commonly used thermoplastics but there still seems to be a lot of confusion about properly drying nylon and in general about how nylon is affected by moisture. Moisture in the raw material causes many processing issues and part failures and the affects that moisture has on molded parts seems to confound people as well. I hope in this article to clear some of this up.

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Weekly News Digest Week of 7/11/2016

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Polypropylene based compound eyes TPU market in gearshift knob application

Electric bike turns to PBT/ASA alloy for battery housing

Amcor closing Ohio based bottle preform production plant

Milliken touts polypropylene additives at K2016

Solvay expands PPS portfolio for food packaging

“Rivet” Graphine proves it’s mettle

SABIC shows new high flow polypropylene for packaging applications

 

Plastic Weathering Demysitfied

Old Car Desert

One the biggest technological advancements in plastics over the last 30 or so years have been the improvement in UV stability. I can remember how fast vinyl dashboards in cars used to split and crack from sunlight exposure. Today, you rarely see that until the car has been in the junk yard for a few years. Even white vinyl siding and fencing seem to hold their color reasonably well for a decade or more. This is thanks to additives manufacturers developing really sophisticated stabilizers and anti-oxidants that can be compounded into various plastic materials.

In this post, I wanted to de-mystify what causes UV damage to plastics and how UV stability is tested.

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Weekly News Digest Week of 6/27/2016

The Front Page Newsroom

IBM discovers new recycling process to convert old smartphones and CDs

Dow cutting 2500 jobs in Dow Corning integration

A. Schulman sues form Citadel owners for claiming fraudulent business practices

A. Schulman still sees benefits from acquisition of Citadel

Man dies in press accident at injection molder in Auburn Hills MI

New lubricated TPV challenges rubber in gaskets and seals

BASF launches new global pigments brand

Company develops long glass fiber reinforced polyolefin sheet

Material prices flat

The next target of the anti-plastic crowd: your garden hose

Polypropylene prices lowest since 2009

DSM launches new polyamides for die cast metal replacement

 

 

The Confusing World of TPE

Diamond Rubber Company

There is an excellent albeit highly technical article in the April 2016 SPE magazine, Plastics Engineering, about the differences between thermoplastic elastomers (TPE) and thermoset rubber. You can read it here.

Because I talk primarily about thermoplastics here at The Weekly Pellet, I thought that I might expand on the article a little bit and talk about the different types of TPE that are commercially available.

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