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Production technology of air-blowing optical fiber cable double-layer co-extrusion casing pipe

A fiber optic cable, double-layer co-extrusion technology, applied in the field of air-blown fiber optic cable double-layer co-extrusion casing production process, to achieve the effects of improved mechanical properties, excellent flexibility and fluidity

Inactive Publication Date: 2015-12-02
JIANGSU HENGTONG PHOTOELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The essence of this solution is still to use PBT single-layer extrusion, but with the addition of PC, the effect will be improved to a certain extent

Method used

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  • Production technology of air-blowing optical fiber cable double-layer co-extrusion casing pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Dry PBT at 80°C and dry PC at 100°C;

[0016] 2) In step 1), the weight ratio of 50% PC after drying and the weight ratio of 50% PBT after drying are respectively put into No. 1 extruder and No. 2 extruder for melting and plasticization, and No. 1 extruder extrudes the PC material. , its temperature is 268-280 ℃, the No. 2 extruder extrudes PBT material, and its temperature is 250-265 ℃;

[0017] 3) In step 2), the melted and plasticized PC and PBT materials are merged in the die of the die, and the optical fiber that penetrates into the die and is filled with ointment is covered at the same time;

[0018] 4) Step 3) After molding, the sleeve coated with the ointment-filled optical fiber is cooled in circulating water at 20-40° C., and is pulled with a force of 4N while cooling;

[0019] 5) Close the casing in 4) at a speed of 150-220 m / min.

Embodiment 2

[0021] 1) Dry PBT at 80°C and dry PC at 100°C;

[0022] 2) In step 1), the weight ratio of 60% PC after drying and the weight ratio of 40% PBT after drying are respectively put into No. 1 extruder and No. 2 extruder to melt and plasticize, and No. 1 extruder extrudes the PC material. , its temperature is 268-280 ℃, the No. 2 extruder extrudes PBT material, and its temperature is 250-265 ℃;

[0023] 3) In step 2), the melted and plasticized PC and PBT materials are merged in the die of the die, and the optical fiber that penetrates into the die and is filled with ointment is covered at the same time;

[0024] 4) Step 3) After molding, the sleeve coated with the ointment-filled optical fiber is cooled in circulating water at 20-40° C., and is pulled with a force of 4N while cooling;

[0025] 5) Close the casing in 4) at a speed of 150-220 m / min.

Embodiment 3

[0027] 1) Dry PBT at 80°C and dry PC at 100°C;

[0028] 2) In step 1), the weight ratio of 70% PC after drying and the weight ratio of 30% PBT after drying are respectively put into No. 1 extruder and No. 2 extruder for melting and plasticization, and No. 1 extruder extrudes the PC material. , its temperature is 268-280 ℃, the No. 2 extruder extrudes PBT material, and its temperature is 250-265 ℃;

[0029] 3) In step 2), the melted and plasticized PC and PBT materials are merged in the die of the die, and simultaneously cover the optical fiber that penetrates the die and is filled with ointment;

[0030] 4) Step 3) After molding, the sleeve coated with the ointment-filled optical fiber is cooled in circulating water at 20-40° C., and is pulled with a force of 4N while cooling;

[0031] 5) Close the casing in 4) at a speed of 150-220 m / min.

[0032] The obtained casing of the present invention is subjected to a mechanical property test, and the obtained results are shown in t...

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Abstract

The invention discloses a production technology of an air-blowing optical fiber cable double-layer co-extrusion casing pipe. The technology comprises the following steps that (1), PBT is dried at a temperature ranging from 80 DEG C to 90 DEG C, and PC is dried at a temperature ranging from 90 DEG C to 100 DEG C; (2), the dried PC and the dried PBT in the step (1) are put into a first extruder and a second extruder respectively to be molten and plastified, the first extruder extrudes the PC, the temperature of the PC ranges from 268 DEG C to 280 DEG C, the second extruder extrudes PBT, and the temperature of the PBT ranges from 250 DEG C to 265 DEG C; (3), the molten and plastified PC and PBT in the step (2) are jointed in a machine head bush die and then are compositely molded, and meanwhile, an optical fiber which penetrates into a machine head and is filled with ointment is wrapped; (4), the casing pipe with the optical fiber which is molded in the step (3) and wrapped and filled with the ointment is cooled in circulating water at a temperature ranging from 20 DEG C to 40 DEG C, and 4N force is used for carrying out traction while cooling is carried out; and (5), the casing pipe in the step (4) is reeled with the speed ranging from 150 to 220m / min.

Description

technical field [0001] The invention relates to a production process for a double-layer co-extrusion sleeve of an air-blown optical fiber cable, and belongs to the technical field of new materials. Background technique [0002] The air-blown micro-optical cable has high optical fiber density and small diameter, and can enter the silicon-core micro-tube with relatively small diameter to improve the utilization rate of communication pipes; the micro-air-blown optical fiber cable with high optical fiber density and small diameter solves the problem of current network construction. High investment cost and low fiber utilization. At the same time, the corresponding loose tube needs to have the characteristics of low back shrinkage, low fiber excess length, high tensile elastic modulus, and bending elastic modulus. Most of the loose tubes used in optical cables are extruded in a single layer of PBT materials. Since PBT is a crystalline material and the crystallization is incomple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/02B29C47/04B29C47/06B29C47/56
CPCB29C48/17B29C48/154B29C48/18B29C48/49
Inventor 刘沛东张增强许人东沈新华轩传吴居志纲潘红舟吴迪吴金华施李萍吴水荣
Owner JIANGSU HENGTONG PHOTOELECTRIC
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