| 摘要 |
PROBLEM TO BE SOLVED: To reduce ceramic heater manufacturing failures.SOLUTION: A molding die is used, which includes: a fold molding part, which is provided for molding an unbaked fold that is to be provided as a fold after baking; and a pair of lead molding parts, which is provided for molding a pair of unbaked leads that are to be provided as a pair of leads after baking and of which each one end is connected with each of both ends of the fold molding part. By using this molding die, mold material is injected from the other end of each of the pair of lead molding parts. Thereby, an unbaked resistor that is to be provided as a resistor after baking is molded by injection molding. In the molding die, the minimum cross-sectional area in a range from a channel for injecting the mold material into the pair of lead molding parts to the pair of lead molding parts is 15 to 35% of the maximum cross-sectional area in this range. The injection molding is carried out under the conditions in which the fusing point of wax contained in the mold material is 70 to 80°C, and the temperature of the mold material when injection takes place is 125 to 150°C. |
