| 摘要 |
A method and apparatus for the manufacture of metal needles, having torpedo-shaped or bullet-shaped points, for the use in fibrillating rollers. A metal wire is passed through a first pair of driven rollers and into a second pair of rollers driven at a greater speed. The two pairs of rollers are connected in an electrical circuit. Upon entering into the second pair of rollers, the wire closes the circuit, is electrically heated and mechanically tensioned and breaks. The circuit comprises a time-delay relay, the extent of the time-delay being determinative for the shape of the needle points. |
