| abstract |
In order to provide a method and a device which allows an effective controllable temperature profile on a glass tube shaped body of a metering draw needle, the invention proposes that the aggregates nozzle ring, metering needle with the glass tube shaped body a) by a NF-AC and / or b) be electrically heated by a MF / HF field. As a result, a devitrification on the aggregates, which makes disturbing as a pull strip on the glass tubes, avoided. |