May 25, 2021
Granulate for the production of plastic parts is usually fed to the injection molding machine via a permanently installed hopper. If the material is changed frequently or if small quantities of material are processed, the fixed hopper is unsuitable for handling.
In order to apply e.g. cleaning granulate safely and without spillage at the injection molding machine, a universal hopper is therefore ideally used. This has a magnetic base and can be quickly replaced on the machine. With an integrated closing slide, an exact and economical dosage of the respective material is made possible. This means that a universal funnel is also ideal for sampling or for processing very small quantities.
Injection molding process:
CAD data set of a universal funnel for use on any injection moulding machine
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Dec 6, 2018
In the injection mold, in general, every cooling circuit stays at one temperature over the complete cycle.
For parts with a high demand on surface quality it is important that the melt reproduces the cavity perfectly.
A variotherm process is used to achieve this.
Hereby one or more cooling channels will be processed with a lot higher temperature during filling phase (A in the picture below).
As this results in a longer cycle time, the coolant temperature is decreased during cooling phase (B in the picture below) to speed up the process.
The phase of mold movement (C in the picture below) is used to heat up the coolant of the specific circuits to the higher temperature for the next cycle.
Dec 11, 2018
After approximately 95-98% of part filling the switch between filling and packing phase is made.
This point is called VP-Switch (red arrow).
It is the change from the flowrate controlled filling to the pressure controlled packing phase.
The right time for the switch can be found with the help of the cavity pressure.
