| 摘要 |
PROBLEM TO BE SOLVED: To obtain a secure and efficient screwing work in a simple constitution and always adsorb the forming chips generated in screwing so as not to drop the chips on parts. SOLUTION: A coating material 8 containing microcapsules in which an absorbing and adsorbing material with an appropriate viscosity is enclosed is applied on a range of at least 60% from the front end of the total length of the leg 3 where the ridge 10 of a screw screwed in a work 20 is formed. Thereby, the chips 23 generated in screwing are adsorbed not to drop down. Hence, the screw can be screwed while directly forming a female screw in a soft work by a tapping screw and the chips generated in the screwing operation in forming the female screw do not drop down. And further, the chips neither drop on precise electronic instrument parts nor stick thereto. Accordingly, causes of troubles such as short or the like in a circuit of an electronic instrument are solved and causes of fire are eliminated.
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