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Three-layer co-extrusion loose tube method and three-layer loose tube for layer stranded optical fiber cable

A fiber optic cable, three-layer co-extrusion technology, applied in the field of optical cable manufacturing, can solve the problems of high and low temperature performance of optical cable, influence of tensile performance and transmission performance, poor consistency of excess length of loose tube, difficulty in consistent shrinkage performance of toner, etc. , achieve the effects of reducing production costs, bright colors, and increasing mechanical properties

Active Publication Date: 2019-04-19
浙江东通光网物联科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the rapid development of the current optical network, the number of large-core multi-layer twisted optical cables with more than twelve twisted units has also increased. The easy distinction between twisted units and the convenience of construction and connection have become problems, and due to different colors The shrinkage properties of the toner in the thermoplastic material are difficult to be consistent, which will lead to poor consistency of the excess length of loose tubes of different colors, and the high and low temperature performance, tensile performance, and transmission performance of the optical cable will be affected to a certain extent, and some parts may even appear. The case where the fiber attenuation exceeds the standard in the loose tube

Method used

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  • Three-layer co-extrusion loose tube method and three-layer loose tube for layer stranded optical fiber cable
  • Three-layer co-extrusion loose tube method and three-layer loose tube for layer stranded optical fiber cable

Examples

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Effect test

Embodiment 1

[0032] like figure 1 As shown, the present embodiment discloses a three-layer co-extruded loose tube method for a stranded optical fiber cable, including the following steps:

[0033] Step 1: Dry each layer of PBT material separately at 100°C (natural color inner layer material, outer layer colored leather material, outer layer colored strip material). Step 2: Transport the dried PBT natural color inner layer material, PBT outer layer color leather material and PBT outer layer color strip material to No. 1 extruder, No. 2 extruder and No. 3 extruder through different conveying pipelines in the extruder hopper.

[0034] The third step: In each plastic extruder, each layer of PBT material is melted, plasticized and transported through the screw and screw chamber, and enters the respective material distribution cones according to the different flow channels designed in the machine head: PBT inner layer material Convey to the inner distribution cone, the PBT outer layer color le...

Embodiment 2

[0040] Disclosed in the embodiment 2 is the three-layer co-extrusion loose tube method for the stranded optical fiber cable, comprising the following steps:

[0041] Step 1: Dry each layer of PP material (natural color inner layer material, outer color leather material, outer color strip material) at 80°C.

[0042] Step 2: Transport the dried PP natural color inner layer material, PP outer layer color leather material and PP outer layer color strip material to No. 1 extruder, No. 2 extruder and No. 3 extruder through different conveying pipelines. in the extruder hopper.

[0043] The third step: In each plastic extruder, each layer of PP material is melted, plasticized and conveyed through the screw and screw chamber, and enters the respective material distribution cone according to the different flow channels designed in the machine head: PP inner layer material Convey to the inner distributing cone, PP outer color leather material is conveyed to the outer distributing cone,...

Embodiment 3

[0049] Embodiment 3 discloses a three-layer co-extruded loose tube method for layer-stranded optical fiber cables, including the following steps:

[0050] Step 1: Dry each layer of PP material (natural color inner layer material, outer color leather material, outer color strip material) at 90°C.

[0051] Step 2: Transport the dried PP natural color inner layer material, PP outer layer color leather material and PP outer layer color strip material to No. 1 extruder, No. 2 extruder and No. 3 extruder through different conveying pipelines. in the extruder hopper.

[0052] The third step: In each plastic extruder, each layer of PP material is melted, plasticized and conveyed through the screw and screw chamber, and enters the respective material distribution cone according to the different flow channels designed in the machine head: PP inner layer material Convey to the inner distributing cone, PP outer color leather material is conveyed to the outer distributing cone, and PP outer...

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Abstract

The invention relates to a three-layer co-extruded loose tube method for a layer-stranded type optical fiber cable. A three-layer co-extruded loose tube is co-extruded by three screw extruders; due to the special runner design, the pressure control and the use of natural pigments and colorful pigments of the same base material, the problem of interface bonding force of three layers is solved, so that the production feasibility of the three-layer co-extruded loose tube is guaranteed; the problem of identification of the loose tube caused by more than 12 layer-stranded type optical cable stranding units and the problem of excess length caused by toners of colorful pigments are solved; the three-layer co-extruded loose tube has high use value.

Description

technical field [0001] The invention belongs to the field of optical cable manufacturing, and in particular relates to a three-layer co-extruded loose tube method and a three-layer loose tube for layer-stranded optical fiber cables. Background technique [0002] In the existing layer-stranded optical cable technology, the secondary coating layer of the loose tube is generally extruded from a single layer of thermoplastic material, and the loose tube has only twelve colors according to domestic standards. However, with the rapid development of the current optical network, the number of large-core multi-layer twisted optical cables with more than twelve twisted units has also increased. The easy distinction between twisted units and the convenience of construction and connection have become problems, and due to different colors The shrinkage properties of the toner in the thermoplastic material are difficult to be consistent, which will lead to poor consistency of the excess l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/44
CPCG02B6/443G02B6/4486
Inventor 吴迪刘沛东尹纪成吴俊雄沈新华潘红舟钱建荣江荣吴水荣居志纲王中凯孙丽华
Owner 浙江东通光网物联科技有限公司