Precise metering of blowing agents and additives
LEWA
When manufacturing insulation panels, packaging foils or molded parts, blowing agents must be metered into the plastic melt under high pressure and extreme temperatures in order to achieve a high-quality result. The Ecofoam system (photo) is a new complete solution that includes pump, measuring and control technology that delivers precision and minimized downtime. It pumps the blowing agents (such as CO 2, propane, butane, halogenated hydrocarbon and pentane) in quantities proportional to the speed of the extruder, thereby guaranteeing precise metering, even when pressures are fluctuating. For liquids that naturally display a wax-like consistency, this company has also developed heatable systems that are designed for temperatures of up to 130°C and pressures of up to 500 bars. These metering systems are suitable for a large variety of additives, including flame retardants, lubricants and static inhibitors, as well as plasticizers. Hall 7a, Stand B26 — LEWA GmbH, Leonberg, Germany