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光纤预制棒生产方法对比
光纤预制棒生产方法对比
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所属报告:
长飞光纤-投资价值分析报告:行业回暖+横向拓展迎来成长拐点-220406(41页).pdf
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光纤预制棒制造工艺目前为“两步法”,即首先通过气相沉积法等方法制成预制棒芯棒,之后在芯棒外采用不同技术制造外包层,以增加单根预制棒的可拉丝长度,提高生产效率。1)芯棒制造:如今普遍使用气相沉积法,主要包括轴向汽相沉积法(VAD)、管外化学汽相沉积法(OVD)、改进化学汽相沉积法(MCVD)、等离子体化学汽相沉积法(PCVD)。其中 VAD 和 OVD 都属于管外气相沉积法,MCVD 和 PCVD 属于管内气相沉积法。2)外包层制造:通常采用大套管法(RIC)工艺,使套管与芯棒熔为一体,也可使用 OVD 法在棒的侧面沉积、制作预制棒的外包层部分。
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当前图表所属:
长飞光纤-投资价值分析报告:行业回暖+横向拓展迎来成长拐点-220406(41页).pdf
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