Method for nozzle-injection of gas into molten glass
View Patent ↗A method and device for nozzle-injection of gas into molten glass is disclosed wherein a gas stream is introduced into the molten glass in a temporally pulsed throughput such that the gas stream is interrupted between two sequential pulses, the duration of each pulse amounting to less than one second.
1. Method for nozzle-injection of gas into molten glass, comprising:
1.1 introducing a gas stream into a molten mass in a temporally pulsed, throughput;
1.2 interrupting the gas stream between two sequential pulses by creating a pressure-free phase;
1.3 wherein duration of the pulses amounts to less than 1 s and wherein following the pulse the pressure falls from a maximum value to null within a time span of less than 100 ms.
2. Method according to claim 1 , wherein the duration of the pulses amounts to less than 100 ms.
3. Method according to claim 1 , wherein the duration of the pulses amounts to less than 50 ms.
4. Method according to claim 1 , wherein following the pulse the pressure falls from a maximum value to null within a time span of less than 50 ms.
5. Method according to claim 1 , wherein a temporal interval between two sequential pulses amounts to at least 1 s.
6. Method according to claim 1 , wherein a temporal interval between two sequential pulses amounts to at least 10 s.
7. Method according to claim 1 , further comprising the step of:
8.1 depleting the molten mass of foreign gases through flushing with O 2 gas;
8.2 wherein pulsing of the gas stream produces bubbles having a high surface-area/volume ratio through impressed pressure profiles, in order to minimize the bubble volume and to maximize the expelling of foreign gas.
8. Method according to claim 1 , wherein following the pulse the fall in pressure causes an underpressure of the gas stream which creates a backsucking effect.