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Injection molding: defection possibility and rules of design

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Defection possibility of injection molding

Defect Causes
Streak/Flash Infusion weight too high

Brace compel too low

Distorting/Warping Non-uniform cooling rate
Air pockets/bubbling Infusion temperature too high

An excessive amount of dampness in material

Non-uniform cooling rate

Unfilled areas Deficient shot volume

Stream rate of material too low

Sink marks Infusion weight too low

Non-uniform cooling rate

Ejector marks Cooling time too short

Discharge constrain too high

A considerable lot of the above deformities are caused by a non-uniform cooling rate. A variety in the cooling rate can be caused by non-uniform divider thickness or non-uniform mold temperature.

Rules of design in injection molding

Most extreme divider thickness

Lessening the most extreme divider thickness of a section to abbreviate the process duration (infusion time and cooling time particularly) and diminish the part volume

Part with thick walls injection molding false

Part with thick walls -incorrect way

Part with thin walls injection molding correct

Part with thin walls – correct

Uniform divider thickness will guarantee uniform cooling and lessen absconds

injection molding Non-uniform wall thickness (t1 ≠ t2)

Non-uniform wall thickness (t1 ≠ t2)

injection molding Uniform wall thickness (t1 = t2)

Uniform wall thickness (t1 = t2)


Round corners to lessen pressure focuses and break

Internal range ought to be at any rate the thickness of the dividers

injection molding sharp corner

Sharp corner

injection molding round corner

Round corner


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