Moisture protection for multilayer extrusion blow molded bottles is provided by new desiccant-layer technology from Sasaki Chemical, Kyoto, Japan. TricorBraun, St. Louis, Mo., a distributor of packaging materials, has licensed the DryKeep technology and is working with a leading blow molder to develop three-layer containers for pharmaceuticals, nutraceuticals, and cosmetics. Sandwiched between inner and outer layers of HDPE is a moisture-abatement layer that consists of a proprietary magnesium sulfate desiccant blended with HDPE. The amount of desiccant ranges from 25% to 40%, depending on the application, and the layer constitutes about 40% to 60% of total bottle thickness. An unusual feature is that moisture bonds to the material and is not re-released back into the container. Within a 12-hr period, the desiccant material maintains moisture equilibrium in the range of 30% to 40% R.H. That moisture level is maintained even after opening and closing the package up to 1000 times, TricorBraun claims. In Japan, the desiccant system has been used in films for various moisture-sensitive pouches. TricorBraun is working on the fi rst bottle projects for cosmetics and pharmaceuticals. Tel: (800) 325-7782 . www.tricorbraun.com
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