Extrusion foaming
The use of physical blowing agents such as carbon dioxide or nitrogen in extrusion foaming processes enables lighter parts and lower raw material consumption
The physical blowing agent is first injected into the polymer melt by means of a metering device with high precision and then dissolves into the polymer. Pressure is maintained throughout the extruder. A rapid pressure drop produces a homogeneous cell structure of the foamed polymer. The result is a lightweight, stable product that can be used in a wide range of applications, including packaging, automotive, construction and manufacturing.
Typical products foamed with carbon dioxide are extruded polystyrene (XPS) insulation panels or extruded polystyrene foam films for food packaging. Nitrogen is mainly used in the production of polyethylene cable insulation.
Inert gas dosing device
The patented DSD 500 metering device enables precise metering of inert gases, e.g. gaseous nitrogen or liquid carbon dioxide into an extruder, injection molding machine or PUR foaming system.
The flow rate is controlled extremely precisely and independently of pressure, temperature or type of gas.
Booster systems for liquid carbon dioxide
Choose from our wide range of high-performance low-pressure pumping systems for liquid carbon dioxide for your foaming process. The systems with max. 80 bar can be used to supply any type of metering pumps with bubble-free liquid carbon dioxide. The carbon dioxide pressure can be adjusted according to your needs.
Internal cooling during extrusion
The use of liquid carbon dioxide for internal cooling during extrusion of profiles and pipes increases extrusion capacity at very low investment costs
Uniform cooling of the profile reduces unwanted deformation and product quality is improved. No residues or moisture remain inside the profile. This patented technology is particularly recommended for thick-walled parts and for extrusion lines with limited cooling distances.
