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GLOSSARY OF TERMS
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Dura+ User Manual
Injection Pressure:
The pressure on the face of the injection screw or ram
when injecting material into the mold, usually expressed in psi or bar.
Knockout Pins:
A rod or device for knocking a finished part out of a mold.
L/D Ratio:
A term used to help define an injection screw. This is the screw
length-to-diameter ratio.
Manifolds:
distribute melt from the inlet component to one or more sub-
manifolds within a Hot Runner.
Melt Flow Rate:
A measure of the molten viscosity of a polymer determined by
the weight of polymer extruded through an orifice under specified conditions of
pressure and temperature. Particular conditions are dependent upon the type
of polymer being tested. MFR usually is reported in grams per 10 minutes. Melt
flow rate defines the flow of a polypropylene resin. An extrusion weight of 2160
grams at 446°F (230°C) is used.
Melt Flow Index:
Term that defines the melt flow rate of a polyethylene resin.
An extrusion weight of 2160 grams at 310°F (190°C) is used.
Mold:
A series of machined steel plates containing cavities into which plastic
resin is injected to form a part.
Mold Frame:
A series of steel plates which contain mold components, including
cavities, cores, runner system, cooling system, ejection system, etc.
Mold-Temperature-Control Unit:
Auxiliary equipment used to control Hot
Runner temperature. Some units can both heat and cool the mold. Others,
called chillers, only cool the mold.
Moving Platen:
The platen of an injection molding machine that is moved by a
hydraulic ram or mechanical toggle.
Multi-Cavity Mold:
A mold having two or more impressions for forming finished
items in one machine cycle.
Multi-Material Molding:
The injection of two-or-more materials, in sequence,
into a single mold during a single molding cycle. The injection molding machine
is equipped with two-or-more plasticators. (See also co-injection)
Nest Plate:
A retainer plate in the mold with a depressed area for cavity blocks.
Non-Fill:
See short shot.
Non-Return Valve:
Screw tip that allows for material to flow in one direction
and then closes to prevent back flow during injection.
(Machine) Nozzle:
The hollow-cored, metal nose screwed into the injection
end of a plasticator. The nozzle matches the depression in the mold. This
nozzle allows transfer of the melt from the plasticator to the runner system and
cavities.
Glossary of Terms - continued
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