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Joachim Müller

Reinhard Koch

Dirk Berthel

A method and a facility produce polylactide (PLA) by polymerization, in which a lactide mixture is mixed with at least one catalyst, is introduced into a modular planetary roller extruder and the finished PLA is then removed. The lactide mixture continuously passes through segments of the extruder. The course of the reaction is measured and controlled in the segments in a targeted manner such that the temperature can be set by heating and/or cooling. The pressure can be variably set depending on pressure values to be checked by a controllable gas extraction and/or a controllable extruder speed and/or static variability of the planetary rollers and/or a variable metering speed of the lactide mixture and/or a variable mixing ratio of the lactide mixture. Flammable gas is removed in an explosion-protected zone in a partial region of the extruder. Additives are introduced into the extruder during the rolling process.

Method and facility for producing polylactide (PLA) from a lactide mixture by means of polymerization

The invention relates to a leaky coaxial antenna () comprising an inner conductor (), a dielectric () around the inner conductor (), and a first shield conductor () disposed around the dielectric (), the first shield conductor having openings () distributed in longitudinal direction of the inner conductor () and being adapted in that electromagnetic energy passes through the openings (). A second shield conductor () is disposed around or underneath the first shield conductor (), the second shield conductor () being adapted to cover or mask at least a number of the openings () of the first shield conductor in a shielded section (S-S). The second shield conductor () is arranged discontinuously In the longitudinal direction of the antenna () defining uncovered or unmasked portions (AS-AS) of the first shield conductor () in the longitudinal direction of the antenna which are adapted in that electromagnetic energy passes through the uncovered portions (AS-AS). Thus, the present invention suggests a two-layer shield for improving the properties of a leaky coaxial antenna with respect to e.g. aerospace applications.

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91785 Pleinfeld, Germany

Joachim Müller