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Dura+ User Manual
GLOSSARY OF TERMS
© 2020 Mold-Masters (2007) Limited. All Rights Reserved.
Closed-loop Control:
System for monitoring complete, injection molding-
process conditions of temperature, pressure and time, and automatically
making any changes required to keep part production within preset tolerances.
Cooling Channels:
Channels located within the body of a mold through which
a cooling medium is circulated to control the mold surface temperature.
Cushion:
Extra material left in barrel during cycle to try and ensure that the
part is packed out during the hold time.
Cycle:
The complete sequence of operations in a process to complete one set
of moldings. The cycle is taken at a point in the operation and ends when this
point is again reached and moving platens of the clamp unit in the fully open
position.
Cycle Time:
The time required by an injection molding system to mold a part.
Dwell:
A pause in the applied pressure to a mold during the injection cycle just
before the mold is completely closed. This dwell allows any gases formed or
present to escape from the molding material.
Ejector Pins:
Pins that are pushed into a mold cavity from the rear as the mold
opens to force the finished part out of the mold. Also called knockout pins.
Ejector Return Pins:
Projections that push the ejector assembly back as the
mold closes. Also called surface pins or return pins.
Ejector Rod:
A bar that actuates the ejector assembly when the mold opens.
Family Mold:
A multi-cavity mold where each of the cavities forms one of the
component parts of an assembled finished part.
Fill:
The packing of the cavity or cavities of the mold as required to give a
complete part or parts that are free of flash.
Flow:
A qualitative description of the fluidity of a plastic material during the
process of molding. A measure of its moldability generally expressed as melt
flow rate or melt index.
Gate:
An orifice through which the melt enters the mold cavity.
Hot Tip Gate:
An injection molding method that uses a heated gate on the
A-side of the part to eliminate the creation of any runner or sprue. The gate
vestige will be a small sharp bump that can be trimmed if necessary.
Hot Runner Mold:
A mold in which the runners are insulated from the chilled
cavities and are kept hot. Hot Runner molds make parts that have no scrap.
Injection:
The process of forcing melted resin into a mold.
Glossary of Terms - continued