| 摘要 |
PURPOSE:To obtain excellent profile and size stability and rigidity by melting and spinning thermoplastic polyester, molding a monofilament with a specific extension multiplying factor and a diameter into a spiral, and specifying its spring index and pitch interval. CONSTITUTION:A monofilament with a diameter of 1.2-5.0mm. made by melting and spinning thermoplastic polyester and extending it at an extension multiplying factor of three times or more is molded into a spiral, the spring index D/d is set to 3-7, where D is the diameter of the spring and (d) is the diameter of the monofilament, and the pitch interval is set to DX0.5(mm.) or less. In this case, polyethylene terephthalate or the like is used for thermoplastic polyester. The polyester monofilament is produced by extruding a molten polymer through a spinning nozzle and spinning it, cooling it and applying oil to it, then extending and heat-fixing it. Accordingly, excellent rigidity and profile and size stability can be obtained. |
