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GLOSSARY OF TERMS
© 2020 Mold-Masters (2007) Limited. All Rights Reserved.
Dura+ User Manual
Shot:
The complete amount of melt injected during a molding cycle, including
that which fills the runner system.
Shot Capacity:
Generally based on polystyrene, this is the maximum weight of
plastic that can be displaced or injected by a single injection stroke. Generally
expressed as ounces of polystyrene.
Single-Cavity Mold:
A mold having only one cavity and producing only one
finished part per cycle.
Sprue Bushing:
A hardened-steel insert in the mold that accepts the Screw
nozzle and provides an opening for transferring the melt.
Sprue Gate:
A passageway through which melt flows from the nozzle to the
mold cavity.
Sprue:
The feed opening provided in injection molding between the nozzle and
cavity or runner system.
Stationary Platen:
The large front plate of an injection molding press to which
the front plate of the mold is secured. This platen does not move during normal
operation.
Thermoplastic:
A polymer which melts or flows when heated. Thermoplastic
polymers are usually not highly cross-linked, and act much like molecular
solids: low melting and boiling points, high ductile strength.
Thermoset:
A polymer that does not melt when heated. Thermoset polymers
“set” into a given shape when first made and afterwards do not flow or melt, but
rather decompose upon heating. They are often highly cross-linked polymers,
with properties similar to those of network covalent solids, i.e., hard and strong.
Valve Disk:
Manifold component designed to be compressed by thermal
expansive forces to form part of the plastic sealing mechanism. Its high
tolerance bore allows the valve pin to shift through it without plastic leakage
and part of it enters the melt stream and helps guide the plastic flow without
stagnation.
Valve Gating:
An injection molding method that uses a mechanical shut off to
open and close the gate orifice.
Vent:
A shallow channel or opening cut in the cavity to allow air or gases to
escape as the melt fills the cavity.
Some glossary content © DRM Associates 2008 / © Protomold 1999-2009
Glossary of Terms - continued
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