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Canadian Plastics - September 2010

Features

PET BOTTLES: Pushing the boundaries of LIGHTWEIGHTING
Lightweighting PET bottles seems like the perfect win-win strategy, reducing the impact of packaging on both the environment and profit margins. It's hotter than ever, but are we reaching the limits?

Botox for Blown Film
Wrinkles in blown film applications occur for two major reasons: First, bubble instability causes web movement as the bubble is collapsed. Second, uneven tension across the web overcomes the modulus (stiffness) of the web, resulting in permanent deformations in the film. Here's how to prevent both.

INJECTION MOLDING GETS TRIM
Cutting material usage, cycle times -- and equipment prices; When it comes to new developments in injection molding machines, energy savings tend to get the lion's share of attention. But don't be fooled: I/M machine manufacturers have been working to deliver other improvements too. Canadian Plastics looks at some of the latest technologies to help molders reduce resin consumption and trim cycle times -- without necessarily forking over big bucks.

MEDICAL DEVICE MOLDING: YEA or NAY?
You know the statistics: As the baby boom generation enters their sunset years, the global demand for medical devices of all sorts is projected to skyrocket. Grabbing a slice of that market probably sounds like a no-brainer to most plastics processors. But is it? Here's a look at some of the pros and cons.

Quick tips for solving balance problems
Injection molding isn't easy -- as viscosity changes while the plastic melt is in motion, the odds of making balanced parts get smaller. The good news? Hot runners can help fine-tune the balancing process.

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