What can we benefits from gas assisted injection molding?

Extend Design Guidelines

• Hollow Thick Parts or Thick Sections Within Parts

Can Enable:

– Large ribs or flow leaders without process penalties

– Higher stiffness-to-weight ratio in structured parts

– Molding large cross-sections (parts consolidation)

Lower Production Costs

• Short Shot Process With Hollow Sections Can Result in:

– Lower clamp tonnage

– Lower injection pressures

– Reduced cycle time vs. solid sections

• Smooth Surface Appearance Can Result in:

– Improved aesthetics vs. structural foam

– Reduced secondary operations

Dimensional Stability

• Uniform Packing from Within the Cavity Can Result in:

– Reduced stress within part

– Reduced part warpage

– Reduced sink marks

Enhance Flow/Tool Design

• Tool Design Freedom Can Be Obtained by:

– Replacement of external hot and cold runners with

Interior gas channels

– Elimination of undercuts (moving cores) in some parts

Several variations of gas assist molding are used by the plastics

industry. They are differentiated by the method and location of

the gas injection into the polymer melt. The gas can be injected

through the machine nozzle, runner system, sprue, or directly

into the mold cavity under a constant pressure or a constant

volume. Some gas injection methods are covered by one or

more process patents. An appropriate licensing agreement

must be obtained prior to utilizing a specific type of gas assist

molding process.