Method for manufacturing primary preform product

Method for manufacturing primary preform product

  • CN 102,276,143 B
  • Filed: 06/13/2011
  • Issued: 09/12/2017
  • Est. Priority Date: 06/11/2010
  • Status: Active Grant
First Claim
Patent Images

1. a kind of method for manufacturing optical fiber primary preform product, it is handled using internal vapour deposition, wherein, doping and/Or undoped with glass formation gas air-flow be fed into via the supply side of hollow substrate tube with the supply side and dischargeThe inside of the hollow substrate tube of side, wherein, deposition of the glassy layer in the substrate tube is realized due to the presence of reaction zone,Double glazing base tube is surrounded by stove, and methods described is characterised by, the air-flow is being fed into the double glazing base tubeUndergo pretreatment before portion, the pretreatment selected from pre-add heat treatment, Pre-plasma processing or pre-add heat treatment with it is pre- etc.The combination of gas ions processing,The air-flow that the substrate tube will be fed into is considered to be the air-flow including primary air and one or more air-flows,Wherein, the flow velocity of the primary air is higher than the flow velocity of each described air-flow,Secondary air-flow includes oxygen and the fluorochemical of not hydrogen atoms,Only one or multiple described air-flow experience pre-treatment step.

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