| 摘要 |
PROBLEM TO BE SOLVED: To improve the efficiency in cooling a material to be coated by using a double pipe for a connection, introducing air into the outer pipe and a coating material into the central pipeline, changing the respective paths to a mixing and blowing part, mixing the air and the material at the mixing and blowing part and blowing off the mixture. SOLUTION: The air A sent to outer air passage 13 of a spray nozzle 11 by a compressor is introduced into the central passage at a tip opening 13C and blown into a contracting part 15 by changing the passage to the central side. As a result, a negative pressure is generated, the oil O in an oil container is delivered to a central oil feed hose 6 in small amts., passed through the oil passage 14 of the nozzle 11 and sent to the contracting part 15. The oil O is atomized by the air A and sprayed on a work and cutting blade from a blowoff port 17. At this time, the outlet inner diameter of the air passage 13 is about 1 mm, the air A is blown off at a high speed, hence the work and cutting blade are powerfully and locally cooled, and the distortion, deformation, deterioration, or the like, are prevented.
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