Glossary of Terms

Glossary of Terms

A
AdditivesExternal substances mixed with the resin to enhance its characteristics (color, smoothness, fluidity)
Adhesive AssemblyJoining two or more plastic molded parts together using adhesives
Air BurnWhen gases inside the mold are not properly vented, they could burn up the surface of the part and leave black or brown burn marks
Automotive parts manufacturerA person or a company that makes parts relating to automobile industry, with the intention of selling
B
Back PressureResisting pressure induced on the molten material, when it is been injected into the mold. This increased the molding time since more injection forces are needed
BlushingPlastic mold can deform excessively in highly stressed areas and leave white deform marks
BrightenersKinds of additives used to increase brightness and smoothness of the surface
Broken Mold MarksDefects on the part caused by mold damages
C
ChargeMaterial quantity (weight or volume) used to fill up the mold one time
Co-InjectionInjection of multiple material into the mold simultaneously
Compression MoldingProcess of molding by applying pressure on top of the mold
Cycle TimeTime taken for a mold to fully finish and machine to come back to the original state
D
DegassingOpening and closing of the mold at early stage, which allows entrapped gases to bubble out
Direct GateThe sprue which directly allows the molten material to feed into the mold cavity
DiscolorationUnintended changes of color from designing conditions
E
Environmental SustainabilityIndefinite use of renewable energy, and harmless material, with increased levels of recycling and reusing, while nullifying the pollution. If a process comes with these characteristics, it can be identified as an environmentally sustainable process
ExtrusionForming continuous shapes by pressurizing molten material through a cavity
F
Family MoldA mold which consists of multiple different cavities and allows to produce multiple parts at once
FillerAn inert substance mixed with the original material, in order to increase the strength and other properties while maybe reducing the cost
FinishSurface quality and overall quality of the finished part
G
GateA channel which allows the molten material to flow into the mold cavity
Green ManufacturingEnvironment friendly manufacturing process which use renewable energy, and environmental material, with reduced wastages, pollution and emissions. Reusing and recycling are at high levels
H
Hot Runner MoldA mold which gates and other flow lines are kept under hot conditions. Since it is also insulted from cooling cavities, no scrap will be present at the end
I
In-Mold AssemblyMolding several parts using the injection molding process, then assembling them together by moving them inside the molding machine itself
Insert MoldingParts are manufacture by injecting plastic over a pre-placed metal insert (USB cables, electric plugs)
J
JettingA turbulent flow caused in the molten flow due to undersized gates
JigA tool used to whole the parts tightly during the manufacturing process
K
K-FactorUsed to indicate properties like insulation factor, or coefficient of thermal conductivity
Knockout PinThe pin that aids to remove the solidified part from the mold cavity
L
Land AreaThe area of mold parts that is in contact, when two mold parts are clamped together
LubricantsAdditives used to facilitate the molten material flow, without effecting original properties of the compound
M
Metal PartsParts manufactured by injecting metal powder into molds and pressurizing them until them are bounded as a sold
Mold InsertsParts that put inside the mold to achieve cavities in the molded part. Inserts are placed inside the mold cavity as separate components. They are also used to achieve desired cooling conditions
Mold Maker in ChinaChina is known to be the largest supplier of molding components to the world. There are many mold making companies located in china
Multi Shot MoldingInjecting multiple types  (color, type) materials sequentially in different places of the same mold
Multi-shots MoldMold used in multi shot molding. Here, the mold has multiple injection openings
Multi-components MoldMold used in multi component molding
Multi Component MoldingUsing combinations of multiple types of resins for the molding process, in order to increase the properties (aesthetics, strength) of final outcome. Multi-component molding is a variation of multi component molding
Multi-Color MoldMold used in multi-color molding. Here, the mold may or may not be partitioned to achieve desired color sequence
Multi-Color MoldingMaking continuous or discontinuous color patterned parts by injecting different colors of materials to the mold cavity, in desired places
N
Nucleating AgentAdditives mixed with polymers in order to facilitate increased crystallization rates
O
Orange PeelRough, lump full surface occurred by high moisture contents in the mold cavity and poor heat transferring means
Over MoldingMolding process where mold cavity is partially filled with one material, then the second material is injected over the first one such, first injection is enclosed by it
Over PackWhen molten material is flowed through gates, it has a tendency to fill the easiest path first. This causes the molten material to highly pack along that path ultimately leading to distortions
P
Parting LineThe line visible in the final part, where two mold halves were contacted
Plastic Injection MoldingMost frequently used method to manufacture plastic components. There, molten plastic in injected into a mold shaped as the desired part and left out to solidify. Whole process in done in an injection molding machine
Plastic Injection MoldsHollow containers made in desired part shape, which allows injected molten material to cool down and solidify inside them
Prototype MoldA primary mold built before the final mold, in order to ensure the shape and dimensions are correct
R
Recovery TimeThe time taken by the pumping screw to inject a shot and come back to the original state
ResinThe basic substance used in the molten stage for injection molding process
RunnerThe channel that connects the sprue and cavity gate
S
ScrapWaste of the molten process (impurities, residue after polishing)
Short ShotWhen the molten material is not enough to fill the whole cavity, it is called as short shot. The corners of final outcome would appear as melted
Stack MoldsOverall mold is designed by stacking two or more similar molds together and clamping them. Parts manufactured by stack mold will have two or more parting lines.
T
Tandem MoldsA type of stack mold but the molding process is done with multiple alternating injection cycles
ToolAnother word for the mold
U
UndercutAn irregular geometry (protrusion or indentation) that prevent the smooth removal of the part from the mold
V
VentSmall diameter hole cut on the mold in order to let the entrapped air to release
Virgin MaterialPlastic compound or resin that have not undergone any additional processing operation other than initial manufacturing processes
W
WarpageDistortion caused by excessive internal or external stresses
Y
Yellowness IndexWhen the color of a part is evaluated against yellow color scale, it is given a yellowness scale value