Decoupled Molding Defined
DeCoupled Molding is a processing technique that separates the fill, pack, and hold stages of the injection process. Speed control is distinctly separated from pressure control. The filling of the molds is controlled exclusively by machine velocity with abundant pressure. Viscosity variations are accounted for with changes in hydraulic pressure at transfer. The transfer from fill is determined at 90 to 98% full and accounts for all screw inertia.
Why Use DeCoupled Molding?
DeCoupled Molding minimizes sensitivity to viscosity variations from all causes. Fill times remain constant because of easy adaptation to fast fill speeds, adjusting screw position early in the travel. This is a standardized molding technique for all employees to use across all shifts. Process adjustments are reduced to their influence on the four plastic variables: heat, pressure, flow, and cooling. AMA Plastics has a close relationship with RJG, the developer of the DeCoupled Molding Methodology.
Benefits of DeCoupled Molding
The DeCoupled Molding Method utilizes full capability of machines. It is a standardized molding technique for all molding machines. Documentation is simplified for normalized processes and machine independence. This is the most consistent method of molding in regard to quality. When DeCoupled Molding is utilized with mold pressure transducers, static pressure variations that are major cause of part variation are dramatically reduced. This method allows for large shifts in plastics viscosity as supplied by all material manufacturers. A molding process can be documented by Universal Process Sheets not machine specific, but process specific. This systematic approach allows all technical personnel to process the same way, every time without the guess work. DeCoupled Molding has certified training for all levels of manufacturing.