Jan 20, 2020
Contamination (especially when using recyclates) can be removed from the plastic melt with the help of a filter nozzle.
This saves the often very complex cleaning of the following mold components.
Furthermore the plastic melt is homogenized by the filter nozzle.
This has highly positive effects for the distribution of additives and colorants.
The fitler nozzle is attached to the injection unit using a machine-dependent adapter.
The filter removes any contamination (e.g. metal or wood shavings, not melted material) from the plastic melt.
The filter nozzle is very flexible and can be used for almost every application, as well as for filled materials, due to the different filter fineness.
If the filter is contaminated, it can be flushed without disassembly by an automatic “flushing process”.
Hot Runner: Filter nozzle with two different filter inserts.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Nov 5, 2018
In hot runner systems heater bands are used. This is to bring the temperature inside of the melt channel up to the wanted process temperature and keep it constantly at this level.
The hot runner system consists mostly of one manifold and one or more hot runner drops.
In order to control the temperature a sensors are used in combination with PID-Controller.
The aim is to reach a homogeneous temperature distribution within the melt channel.
Nov 15, 2018
In an injection molding tool, the melt channel between cylinder and cold runner / cavity is called hot runner.
The difference from a cold runner is that the hot runner has at least one heater band to keep the hot runner at temperature.
The melt inside the hot runner stays fluid during the complete cycle and will be used directly for the next shot.
No waste is produced.
Hot runners are used to save material or to avoid weld lines (sequential injection).
Nov 27, 2018
In a hot runner system, the hot runner nozzle is located between the manifold and cold runner or cavity.
As it is the last heated area for the melt, a good temperature control is important.
There are both, open and closed nozzles (valve gates).
Oct 16, 2025
This device is used for precise temperature control in hot runner systems of injection molds. By accurately regulating the heaters in the manifold and nozzles, it ensures a consistent melt temperature, which is essential for uniform cavity filling and avoiding quality deviations. Modern devices feature zone control, diagnostics, and overheating protection. Optimal temperature management reduces energy consumption and extends the service life of tool components.
Regler mit vier Regelzonen
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
