Linde has launched new technology that can help North American manufacturers of extruded polystyrene (XPS), polystyrene foam insulation board and polyolefin foaming processes, replace some or all hydrocarbon foaming agents with carbon dioxide (CO2) or nitrogen (N2), and high-pressure gas dosing systems.

Plastinum® DSD 400 metering device

Plastinum® DSD 400 metering device

Use of these inert gases provides consistent, eco-conscious foaming while also reducing the risk of fire hazards.

Linde’s new DSD 400 metering system and process is just one technology from Linde’s PLASTINUM® suite of customer solutions for the plastics industry. Linde’s team of technical consultants and engineers matches the correct process to customers’ individual process needs.

The DSD 400 device is able to provide precise amounts of liquid CO2 or gaseous N2 during the extrusion process to help optimise foaming and reduce density with its high performance compressor, mass flow meters and dynamic control valve.

In addition, the device has the ability to quickly react to constantly changing pressure fluctuations at the extruder allows for a stable extrusion processes and delivers consistent foam structures during continuous extrusion foaming. This allows a customer to minimise, or sometimes even eliminate, the use of flammable hydrocarbons that can affect environmental emissions from the site.

The DSD 400 inert gas metering device handles pressures up to 5081 psi (400 bar) and can pump liquid CO2 through the control valve at a constant rate at speeds up to 66 lb/hr (30 kg/hr).

Similar to Linde’s DSD 500 metering system, the DSD 400 device offers highly accurate dosing and low gas consumption for high efficiency. It features lightweight and compact design for easy installation. Both systems are rated for pressures in excess of 6000 psi, for polymer foaming. However, the DSD 400 device provides a lower cost solution for customers who may not need extreme accuracy in continuous foaming processes.