Triton, the leading provider of off-premise ATMs, and Mack Molding have launched the first new external gas-assist molding (EGM) program into commercial production in the U.S., according to Cinpres Gas Injection (CGI) Inc., the company that licenses the technology.
“Four other molders have bought EGM licenses from Cinpres, but the front fascia on Triton’s 8100 Series cash machine is the first domestic program to make production shipments under license from Cinpres,” confirms Steve Ham, Cinpres application engineer.
Designed to yield sink-free surfaces over ribs and bosses, external gas technology “forms a pillow of nitrogen around the core of the part and presses the core against the cavity in a very gentle, uniform fashion,” explains Ken Kincaid, Mack technical engineering manager, “improving part surface quality.”
First, the mold is virtually filled with plastic. Then, pressurized nitrogen is injected onto the core surface of the mold. The nitrogen evenly presses the core against the cavity, or critical appearance side of the part, and squeezes out sink marks.
While that may sound simple, proprietary know-how brings out the best in this process. Read this issue’s case study to learn more about the advantages of external gas-assist molding and how it is used to solve sink problems and cut costs on Triton’s part, which has six different types of mounting features and about 30 randomly located internal ribs.