| 摘要 |
PURPOSE:To extend the service life of the titled jig by using a polyphenylene sulfide material for a substrate holding jig at the time of forming an Ni-P alloy layer by an electroless plating method as an underlying layer on a substrate surface for a magnetic disk. CONSTITUTION:The shape of a plating jig 1 is the same as the shape of the conventional jig and the polyphenylene sulfide is used for the material of said jig. The plating jig 1 consists of a supporting shaft 2 and a mounting part 4 and 20-30 pieces of grooves 3 are provided to the shaft 2. Disk substrates 5 are passed through their holes onto the shaft 2 from the top end B thereof, then the substrates are loosely fitted in the respective grooves 3. The substrates 5 are passed through the holes 6 of the disks onto the shafts 2 and are loosely fitted in the grooves 3. The holes 6 of the substrates 5 and part of the shaft of the grooves 3 are held in contact with each other by the weight of the substrates 5. The substrates 5 rotate as well when the shaft 2 rotates. Since the polyphenylene sulfide is highly resistant to heat and chemicals, the material is not changed and deteriorated in properties by plating and the pretreatment thereof and the jig having the long service life is obtd.
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