Dec 7, 2018
The display of the injection molding process in the theory is called injection molding simulation.
In the early development of a project, it is used to check and optimize geometry, process and mold.
This way, different versions can be tested at low costs in order to use the best version for the mold.
The optimization of the process during simulation helps to use less materials for the trials and saves time.
Also for the error analysis, the injection molding simulation can be used to find the parameters with the most influence, for example with the help of a DoE.
Jan 5, 2019
The machine builds up an appropriate pressure in order to move the melt into the cavity.
Dependent on the extending flow path length until the flow path end the pressure is rising during filling of the part.
The highest injection pressure can be found usually at the machine nozzle at VP-Switch.
Thin wall thickness leads to a higher pressure difference between melt entrance and melt front.
Nov 27, 2018
A mold is usually divided into two sides according to their function.
The side with the runner system is called injection side.
This side is not moved, therefore another common name is “fixed side”.
Nov 29, 2018
In the injection molding process, the period of filling cold runner (if it exists) and cavity is called injection time (purple line in time pressure diagram below).
A slow injection time has the advantage to have less shear and gentler treated material.However, there is the risk of high injection pressure or unfilled parts due to intense cooling of the melt because of a low injection time.
Oct 13, 2020
The injection molding machine can be separated into different units.
At the beginning of the injection molding process stands the injection unit.
It contains the hopper, through which the granule rinses inside the cylinder with the screw.
The rotating screw and the heating rods at the outside of the cylinder cause the melting and homogenization of the plastic while the meld is transferred to the tip of the screw.
Here the plastic is metered for the process.
At the end of the injection unit is a nozzle through which the melt is pushed into the mold by the forward moving screw during during injection.
The
injection unit with
hopper, cylinder, screw and heating rod.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
