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What is Decoupled Molding?
- A processing technique that separates the Fill, Pack, &
Hold stages of the injection process.
- Separates speed control from pressure control.
- Filling of molds is controlled exclusively by machine velocity
with abundant pressure.
- Viscosity variations are accounted for with changes in hydraulic
pressure at transfer.
- Transfer from fill is determined at 90-98% full and accounts
for all screw inertia.
Why use Decoupled Molding?
- It minimizes process sensitivity to viscosity variations from
all causes.
- Fill times remain constant.
- Easily adapts to fast fill speeds by adjusting screw transfer
position earlier in the travel.
- Standardized molding technique for everyone to use across all
shifts.
- Reduces processing adjustments to their influence on the four
plastic variables: Heat, Pressure, Flow, Cooling.
- AMA Plastics has a close working partnership with RJG, the developer
of the Decoupled molding method.
Benefits of Decoupled Molding
- Utilizes full capability of machines.
- Standardized molding technique for all molding machines.
- Simplifies documentation for normalized processes and machine
independence.
- Decoupled molding is the most consistent method of molding
consistent with quality.
- Utilized with mold pressure transducers can reduce static pressure
variations, the major cause of part variation.
- This method allows for large shifts in plastic viscosity as
supplied by all material manufacturers.
- A molding process can be documented via Universal Process Sheets
not machine specific, but process specific.
- This systematic approach allows all technical personnel to
process the same way, without the guess work.
- This method has certified training for all levels of manufacturing.
- AMA has an in-house RJG certified trainer for Decoupled Molding.
- Helps to identify tooling issues by virtue of rigorous mold
tryouts, and the most capable processes by virtue of DOE, Windows
studies, or other means of data collection.
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