13-1
GLOSSARY OF TERMS
© 2020 Mold-Masters (2007) Limited. All Rights Reserved.
Dura+ User Manual
Section 13 - Glossary of
Terms
Aspect Ratio:
Ratio of total flow length to average wall thickness.
Back Pressure:
The pressure applied to the plastic during screw recovery.
By increasing back pressure, mixing and plasticating are improved; however,
screw recovery rates are reduced.
Backplate:
Inlet component to the Hot Runner manifold.
Barrel
: The part of the molding press where resin is melted.
B-side:
The mold half that mounts to the moving side of the injection molding
press. Sometimes referred to as the core side of the mold or the cold half, the
B-side has ejector pins to push the part out of the open mold. An analysis of
the part geometry determines the optimal part orientation to ensure that it will
remain on the B-side when the mold is opened.
Clamp Force:
The force required to hold the mold shut so resin cannot escape
during injection.
Contoured Pins:
Ejector pins with the ends shaped to match a sloping surface
on the part.
Core:
A convex feature on either side of the mold that will enter an opposing
cavity when the mold is closed. The void between the cavity and core is where
the resin solidifies and forms the part. Often the B-side of a mold is referred to
as the core side.
Core-cavity:
The design of a mold where the A-side forms the outside of the
part and the B-side forms the inside. The advantage to this approach is that the
part will shrink onto the B-side so it can be ejected, and if the inside and outside
are drafted with equal and opposite draft the wall thickness will be constant.
Cycle Time:
The time it takes to make one part including the closing of the
mold, the injection of the resin, the solidification of the part, the opening of the
mold and the ejection of the part.
Cavity:
The space inside a mold into which material is injected.
Clamp:
The part of an injection molding machine incorporating the platens that
provides the force necessary to hold the mold closed during injection of the
molten resin and open the mold to eject the molded part.
Clamping Plate:
A plate fitted to a mold and used to fasten the mold to a
platen.
Clamping Pressure
: The pressure applied to the mold to keep it closed during
a cycle, usually expressed in tons.
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