- المجال: Software
- Number of terms: 1241
- Number of blossaries: 0
- Company Profile:
Moldflow develops plastic injection molding software.
A value that represents the force created by the flow of plastic past the wires of an integrated circuit. The wire sweep index (also known as sweep index) is the sum of viscosity times velocity at each grid point in the model, with the result averaged by the number of grid points.
If the wire sweep index is high in regions of the model containing wires, then it indicates a possible location for wire breakage. Since viscosity is dependent on temperature, shear rate, and the rate of cure, a sweep index may be reduced by changes to these variables.
Industry:Software
A valve gate is a component of a hot runner system. The sprues from the hot runner drop through the cavity plate to the part(s). Each sprue has a rod that can be moved forward to cut off flow through the sprue. The opening of the sprue is timed to be just after the melt front has passed that location. The lower pressure drop through the hot runner system is passed on to the gate, allowing lower filling pressures and reduction in the number of weld lines in the part.
Industry:Software
A vent is a small channel at the end of a flow path that allows air to escape the cavity.
Industry:Software
A weld line is a weakness or visible flaw created when two or more flow paths meet during the filling process. If the two flow fronts have cooled before meeting they don't interdiffuse well and can cause a weakness in the moulded part. A line, notch and /or colour change can appear.
Move weld lines to areas where strength is of less importance and visual appearance is less obvious. You can move weld lines by changing:
*Polymer injection location.
*Wall thickness.
Industry:Software
Also known as decompression or pull-back, suck back is a technique used to clear polymer from the injection nozzle by moving the screw away from the nozzle.
Industry:Software
Also known as silver streaks. There are a few different types:
*Moisture - Streaking occurs opposite the flow direction, due to a high residual moisture content. Drying the material properly will remove this defect.
Air - Air is trapped and cannot escape while the mould is filling. The air is drawn to the surface and stretched in the direction of the flow causing streak marks.
Industry:Software
An insert is a component that is placed into the mould before the injection phase and is anchored into the plastic part by being partially or wholly surrounded by the injected plastic. Typical inserts may have threads, may be electrically conductive, or may be a different plastic material.
Industry:Software
An isotropic material has material properties that are the same in all directions. There are no directional effects of orientation or crystallinity.
Industry:Software
An open loop controller does not respond to measurements of the value being controlled.
See closed loop controller.
Industry:Software
