| 摘要 |
PURPOSE:To obtain a fluorescent lamp without any ununiformities on a coated layer surface even when polyethylene oxide is used as a binder by spraying warm air with a specified range of temperature and air velocity from the top of a glass tube after coating process. CONSTITUTION:While a coated layer is being dried within at least 10% of the full length of a coated glass tube 6 from the top of the coated glass tube 6, the air sprayed on the coated glass tube 6 must have temperature (t) of 40 deg.C<=t <=80 deg.C and the warm air with its velocity (v) of 2m per second <=v<=15m per second is required to obtain an external view within the grade of a good product. Besides, to obtain the external view of the good product, the warm air of 50 deg.C<=t<=70 deg.C and of 4m per second <=v<= 14mper second is required. In this case, air velocity is measured by locating an anemothermometer at a position separated from a nozzle 5 approximately by 5mm.. This nozzle 5 is located at a position 5 to 15mm. from the top of the coated glass tube 6. |
