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Glossary: Design Terms
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- Injection or fill time
- time required to fill the cavity or mold.
- Insert
- a removable part of the mold imparting increased resistance to wear or heat transferability to
that area of the mold.
- Isobar
- a line of equal pressure. In MOLDFLOW graphic output, any point along an isobar sees the same
cavity pressure as any other point along the same isobar.
- Isochrone
- a line of equal time. In MOLDFLOW graphic output, any point along an isochrone is filled at the
same time as any other point along the same isochrone.
- Isotherm
- a line of equal temperature. In MOLDFLOW graphic output, any point along an isotherm is at the
same temperature as any other point along the same isotherm.
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- Land
- gate dimension parallel to the direction of melt flow.
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- Material database
- the file of the information on each material acceptably tested for use in flow analysis modeling.
- Maximum shear stress
- the critical shear stress level for the material prior to part deformation.
- Meld line
- the juncture of two flow fronts moving in the same direction rather than in opposite directions.
Meld lines should be positioned in least sensitive areas.
- Melt
- the molten material which will fill the mold cavity to form the part.
- Mesh
- the finite elements.
- Mold
- the blocks containing the core, cavity, runners and sprue.
- Molding conditions
- all associated conditions (mold temperature, fill time, etc.) required to fill the mold. Also referred to as proce/ssing conditions.
- Molding sensitivity
- the variability of the pressure to fill the cavity and temperature of the melt at the part as
influenced by changes in injection time and barrel melt temperature.
- Mold temperature
- the temperature at which the mold is maintained.
- Molding window
- the range of molding conditions under which a part can be successfully molded (refer to molding sensitivity).
- Multidirectional flow
- flow direction changes during filling resulting in orientation in different directions which can
cause flow marks, stresses and warping.
- Multiple cavity mold
- produces more that one identical part with each cycle.
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- Naturally balanced runner system
- each succe/ssion of runner is identical to the runners in the same succe/ssion in all other flows
in the mold.
- Node
- defined by x, y, z coordinates which in turn defines one point of an element (triangle).
- Nominal Wall
- The nominal wall is what gives the part its basic shape and strength. It forms the framework to which are added all other details to the part.
- Nozzle
- hollow metal hose screwed into the extrusion end of the heating cylinder (barrel) of an injection machine
designed to form a seal under pressure between the heating cylinder (barrel) and the mold.
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- Orientation
- the arrangement of the molecules of the melt. If the molecules are orientated, they are aligned
with each other; if non-orientated they are not in alignment. In general, orientated material
shrinks more than non-orientated materials and has more residual stresses.
- Orifice
- opening.
- Out-of-round
- failure to remain round.
- Overpack
- melt will fill the easiest flow path first and will continue to pack this area while material
reaches the other areas. This is a cause of warping created by unbalanced flow.
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- Part
- the payload formed in the cavity.
- Partially-balanced runner system
- composed of both naturally and artificially balanced runners.
- Parting line
- mark on the part indicating where the two halves of the mold met in closing.
- Part quality
- acceptable standard as defined by part application and/or environment.
- Plots
- graphical representations of analysis results.
- Pressure drop
- the amount of pressure required to fill that section. Adding up the pressure drops over every
section in a flow path totals the pressure required to fill the mold.
- Proce/ssing conditions
- refer to molding conditions.
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