New reheat stretch-blow molding machines are specially designed for low-volume production of water bottles made of biodegradable polylactic acid (PLA) resin. The Freedom Series from Norland International Inc., Lincoln, Neb., can produce PLA bottles up to 1.5-liter size at 4500/hr. Norland is primarily a manufacturer of water-bottling equipment and also makes small reheat stretch-blow machines with two to four cavities and recently came out with a machine model BM8L for PET bottles up to 8 liters. Norland has made several machine adaptations to handle PLA's heat sensitivity. While PET preforms are reheated to 100 C, PLA preforms must be heated to just 75 C. Each lamp in the four heat tunnels is individually controlled. Special barrier shields in the tunnels help protect preforms from premature heat exposure. A U-shaped cooling channel is incorporated in the mold to facilitate better heat transfer.
Norland International Inc.
P.O. Box 67189 Lincoln, NE 68512
Phone (402) 441-3737 Fax (402) 441-3736