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Home > News > Extrusion

An all-round metering system for all blowing agents in foam extrusion

Source:Adsale Plastics Network Date :2024-06-25 Editor :RC
Copyright: This article was originally written/edited by Adsale Plastics Network (AdsaleCPRJ.com), republishing and excerpting are not allowed without permission. For any copyright infringement, we will pursue legal liability in accordance with the law.

LEWA offers its ecofoam metering system for all blowing agents in foam extrusion to solve complex extrusion process caused by variance in blowing agents and their process conditions, such as high pressure or deviating temperatures.


LEWA ecofoam metering system_480.jpg

LEWA ecofoam metering system is designed for all blowing agents in foam extrusion.

 

Challenge in foam extrusion

 

Different blowing agents are used in foam extrusion, such as carbon dioxide, propane, butane, pentane or halogenated hydrocarbons such as Freon 152a.

 

Although discharge pressures and temperatures of these media differ, the metering of blowing agent into plastic melt must be consistently precise in order to achieve a homogeneous and high-quality end product.

 

Universal extruder system for testing all blowing agents

 

The LEWA ecofoam metering system is specifically designed to meter all common blowing agents precisely and reliably. To ensure the required constant foam quality, the quantity of blowing agent in the LEWA ecofoam is adjusted proportionally to the rotation speed of the extruder.

 

The smart control technology continuously compares the signal from the flow meter with the guide signal and regulates the rotation speed of the drive motor accordingly. Due to the pump's pressure-stiff characteristic curve, metering remains constant even for fluctuating extruder pressure.

 

At its core, LEWA ecofoam metering system is hermetically tight and consists of a LEWA ecoflow diaphragm metering pump, which delivers the blowing agent at a pressure of 50-350 bar.

 

The flow rate depends on the set pressure and the compressibility of the medium. For example, it can be 13 kg/h CO2, 8 kg/h i-butane or 20 kg/h H2O at 250 bar.

 

As the system was designed for all known blowing agents, it is explosion-proof for flammable media, such as propane or butane as standard, and is equipped with a cooling unit for carbon dioxide.

 

To ensure the system can be easily transported for testing purposes, all components are securely mounted on a common mount base.


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