Until the middle of the quartz tube length 25 cm LP gas and oxygen gas hole closes up the heating.Cut off the part and then closed in the micro cutter to be 0.3 mm nozzle diameter.
The central portion of the quartz tube of length 25cm was heated until the clogged holes using LP gas and oxygen gas. Then is cut a closed part in the micro-cutter, was cut to the nozzle diameter is 0.3 mm.
The central portion of the quartz tube 25 cm in length and LP gas using oxygen gas to fill up the hole. Cut to pieces after stress in micro cutting, the cutter is closed until 0.3 nozzle diameter in mm.