Low pressure molding is gaining in importance as a way to improve productivity in the production of high-volume, thin-walled packaging.
Procter & Gamble is developing low pressure injection molding through its iMFLUX business unit.
Now comes word that Netstal will demonstrate a 4+4 stack mold at the Fakuma trade show in Germany that makes margarine containers in a low-pressure injection compression molding process. Clamping force is reduced 40 percent compared to standard injection molding.
The big payoff of injection compression molding is a 10 to 20 percent reduction in resin costs because of narrow wall thicknesses and a lighter product. Manufacturing waste is also significantly reduced because of lower stress in the molding process.
Meanwhile, use of a stack mold overcomes the problem of slower cycle times of the injection compression process.
Moldmaker Plastisud developed a stack mold specially adapted to the requirements of the new production process. “The unique injection compression molding technology guarantees perfectly balanced parting planes with an extremely low dispersion rate” says Laurent Buzzo, CEO of Plastisud.
Thomas Iten, PAC application engineer at Netstal adds: “The special design of the stack mold developed by Plastisud plays a key role in this application.” Automation specialist Machines Pagès partnered in handling systems for in-mold labeling (IML).
Netstal only needed to slightly modify an Elion hybrid injection molding machine for the demonstration.