Kortec Inc. claims it has broken a barrier in multilayer PET bottling with the launch of the first 72-cavity coinjection molding system.
Previous coinjection platforms were limited to 48 cavity molds, but Kortec has developed the 72-cavity PET technology for a 300-ton Husky injection press. The Beverly, Mass., supplier of turnkey coinjection systems unveiled the new model at Nova Pack Americas 2003, held Feb. 3-4 in Orlando.
The system allows for multilayer bottles that include barrier and oxygen-scavenging layers.
The technology first was developed for a specialty carbonated soft drink in a 71/2-ounce bottle that required a shelf life of 16 weeks, about twice the shelf life of a monolayer bottle.
``The simplicity of our technology allows us to downsize to fit into the standard Husky mold layouts,'' said John Kermet, Kortec vice president of marketing and sales.
The 72-cavity system costs about 25 percent more than a 48-cavity version, but the 50 percent improvement in productivity yields a 20 percent improvement in capital costs, he said. The Kortec system works on three-layer bottles, and the company is developing equipment for a four-layer system, Kermet said.
Kortec said the new system has a cycle time of less than 18 seconds, the same as an equivalent monolayer bottle.