Baking process of enameled wire – temperature distribution
The distribution of oven temperature has a great relationship with the baking of enameled wire. The distribution of oven temperature has two requirements: longitudinal temperature and transverse temperature. The longitudinal temperature requirements are curvilinear, that is, from low to high, and then from high to low. Transverse temperature requires a straight line. The uniformity of transverse temperature depends on factors such as heating, heat preservation, and hot air convection of the equipment.
The enameling process requires the enameled furnace to meet the
a) Accurate temperature control, ±5℃
b) The furnace temperature curve can be adjusted, and the maximum temperature in the curing zone can reach 550 °C
c) The transverse temperature difference does not exceed 5°C.
There are generally three temperatures in an oven: heat source temperature, air temperature, and wire temperature. It is customary to say that the furnace temperature is measured by a thermocouple placed in the air, and the temperature is generally close to the temperature of the gas in the furnace. T source>T gas>T paint>T line (T paint is the temperature at which the paint produces physical and chemical changes in the oven) Usually T paint is about 100°C lower than T gas.
The longitudinal direction of the oven is divided into an evaporation zone and a solidification zone. The evaporation zone is mainly to evaporate the solvent, and the curing zone is mainly to cure the paint film.