The Dow Chemical Co. and Cargill formed Cargill Dow Polymers LLC to develop and market polylactic acid (PLA) polymers. The PLA polymers are derived from renewable agricultural resources, such as corn or sugar beets. They are composed of chains of latic acid, a natural food ingredient, which can be produced by converting starch into sugar, then fermenting it to yield lactic acid. Water is removed to form lactide, which is converted into the PLA resins using a solvent-free polymerization. "Polylatic acid technology has the potential to provide a new product platform to compete with hydrocarbon-based thermoplastics, such as polyethylene, polystyrene, and polypropylene," says Jim Stoppert, president of the LLC. Like polyethylene terephtalate (PET), the polymers resist grease and oil and offer a flavor and odor barrier. They also provide for heat sealability at lower temperatures than polyolefin sealant resins, according to Stoppert. Contact Dow Customer Information Group at (800) .
Engineers throughout the US are in the midst of celebrating Engineers Week. But the celebration extends beyond the country’s borders, and even beyond the Earth itself; the crew of the International Space Station joined the festivities, too!
Many engineering professionals have come to view CAD as something of a commodity, not an area where much innovation can be expected. CAD tools continue to get better, however, with software delivering powerful capabilities for the evolving product design process.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.