CN110244420A - The treatment process of PBT casing, the central-beam tube type fiber optic cable using and containing the PBT casing - Google Patents
The treatment process of PBT casing, the central-beam tube type fiber optic cable using and containing the PBT casing Download PDFInfo
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- CN110244420A CN110244420A CN201910519470.1A CN201910519470A CN110244420A CN 110244420 A CN110244420 A CN 110244420A CN 201910519470 A CN201910519470 A CN 201910519470A CN 110244420 A CN110244420 A CN 110244420A
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- pbt
- casing
- finished product
- temperature
- loose tube
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
Abstract
The present invention discloses the treatment process of PBT casing, the central-beam tube type fiber optic cable using and containing the PBT casing, belongs to the technical field of optical cable preparation.Low-temperature treatment is carried out after obtaining PBT base-material: optical fiber loose tube PBT semi-finished product are transferred at once in the incubator to -40 ° of low temperature and do low-temperature treatment 3-8 hours；Casing is taken out after the completion of low-temperature treatment immediately, outer shield two sides parallel steel wire tension is drawn to 20kg, while getting out corresponding mold, and casing unwrapping wire is using zero tension stringing, i.e. only straining pulley or dancing wheel；Form PBT Loose tube finished product.By the present invention in that improving the method for casing property with low-temperature treatment semi-finished product, it was improved substantially so that being grown more than casing originally, performance improvement is obvious after finished product production and stablizes.
Description
Technical field
The invention belongs to optical cable preparation technical field, more particularly to PBT casing treatment process, using and contain
The central-beam tube type fiber optic cable of the PBT casing.
Background technique
Existing center beam tube production is mainly that casing two sides add parallel steel wire, and the influence factor of main tensile property is set
Long more than the molding of pipe, technique is regulated and controled when this is mainly casing production, normal process be able to satisfy more than grow 0.2 ‰ -1.2 ‰
Left and right, the laying tension that the later period passes through change casing in the outer shield of production again carry out certain amendment, and the finished product produced stretches
Performance can satisfy substantially rower fibre strain under long-term pulling force≤0.05%, but the stretching of some high standards requirement, than
As fibre strain under long-term pulling force≤0.005%, be difficult to reach, be grown more than casing the case where not influencing the light characteristic of optical cable
Under be difficult to do again it is big.
Summary of the invention
The present invention is to solve technical problem present in above-mentioned background technique, in order to improve the optical cable of such central beam tube type
Tensile property, it is ensured that using can guarantee transmission stable performance under the long-term pulling force of particular surroundings, the present invention summarize with
Preceding technique substantially suitably increases length more than casing with a kind of method in the case where not influencing optical fiber light characteristic, is stretched with improving
Performance.
The present invention is achieved through the following technical solutions: the treatment process of PBT casing, specifically includes the following steps:
Step 1: 1,4- butanediol and terephthalic acid (TPA) are uniformly mixed mixed according to the proportion that molar ratio is 1.0-1.6
Slurry after conjunction；
Step 2: mixed slurry and polymerization catalyst one being played and carry out esterification in reaction kettle of the esterification, are esterified
Temperature is 200~270 DEG C, and esterification reaction pressure is 10kPa~500kPa；
Step 3: the material after esterification enters prepolymerization reaction kettle and carries out polycondensation reaction, and reaction pressure control is
100Pa~20kPa, reaction temperature are 200 DEG C~260 DEG C；
Step 4: the discharging of prepolymerization reaction kettle enters final polycondensation reaction kettle further progress polycondensation reaction, reaction temperature
It is 200 DEG C~260 DEG C, reaction pressure is 10Pa~1000Pa；
Step 5: the discharging of final polycondensation reaction kettle enters Granulation Equipments granulation, continuously enters solid phase system through metering, passes through
Pre- thermal crystalline, is viscosified subsequently into solid phase reactor, and reaction temperature gradient is 170 DEG C~210 DEG C, and reaction time is
15~20 hours, obtain PBT base-material；
Step 6: several optical fiber are bonded together to form fiber optic bundle by binder with belt-like form arrangement, are used
Extruding machine is enclosed with PBT base-material in the outside for the fiber optic bundle for being coated with the fiber paste that blocks water and obtains optical fiber loose tube PBT semi-finished product；
Step 7: optical fiber loose tube PBT semi-finished product are transferred at once small to low-temperature treatment 3-8 is in -40 ° of low temperature of incubator
When；Being set as -40 ° herein is by practice for the environment that can satisfy the minimum temperature that optical cable uses, minimum temperature is -
40°。
Step 8: taking out casing immediately after the completion of low-temperature treatment, outer shield two sides parallel steel wire tension is drawn to 20kg, while quasi-
Get corresponding mold ready；
Step 9: casing unwrapping wire uses zero tension stringing, i.e. only straining pulley or dancing wheel；Formed PBT Loose tube at
Product.
In a further embodiment, the time of the low-temperature treatment in the step 8 is 4 hours.
In a further embodiment, beam tube type cable uses material centered on.
A kind of heart bundled tube optical cable having high tensile property, is prepared, using extruding machine using above-mentioned PBT casing
It is successively enclosed with waterstop and steel aluminium strip from the inside to the outside in the outside of PBT Loose tube, then outside by 250 DEG C -270 DEG C
Nurse's skill, high density polyethylene (HDPE) squeeze out.
In a further embodiment, outer highly dense PE layers of the shield is provided with reinforcer along its length.
In a further embodiment, the binder is epoxy resin cure glue.
In a further embodiment, the outer shield technological temperature is 260 DEG C.
Beneficial effects of the present invention: in order to improve such central beam tube type optical cable tensile property, it is ensured that in Special Ring
Using can guarantee transmission stable performance under the long-term pulling force in border, the present invention before summary technique substantially with a kind of method
Suitably increase in the case where not influencing optical fiber light characteristic it is long more than casing, to improve tensile property, test proves that of the invention
The method for being improved casing property by using low-temperature treatment semi-finished product, was improved so that growing more than casing originally, finished product substantially
Performance improvement is obvious after production and stablizes.The method achieve a kind of production methods of high tensile optical cable.
Specific embodiment
In the following description, a large amount of concrete details are given so as to provide a more thorough understanding of the present invention.So
And it is obvious to the skilled person that the present invention may not need one or more of these details and be able to
Implement.In other examples, in order to avoid confusion with the present invention, for some technical characteristics well known in the art not into
Row description.
Of the existing technology in order to solve the problems, such as: existing center beam tube production is mainly that casing two sides add parallel steel
Silk, the influence factor of main tensile property be casing molding more than it is long, technique is regulated and controled when this is mainly casing production, normally
Technique be able to satisfy it is remaining grow 0.2 ‰ -1.2 ‰ or so, the later period pass through again in the outer shield of production change the laying tension of casing into
The certain amendment of row, the finished product tensile property produced can satisfy substantially rower fibre strain under long-term pulling force≤
0.05%, but the stretching of some high standards requirement, such as fibre strain under long-term pulling force≤0.005%, be difficult to reach,
It is grown more than casing and is difficult to do again in the case where not influencing the light characteristic of optical cable greatly.
Applicant has done related work in this regard, it has been investigated that: the prior art all can be to it when producing PBT casing
Cooling treatment is carried out, but the mode of the cooling treatment generally used is water cooling, therefore the temperature of water cooling is minimum all at 15 DEG C, because
Although this plays certain cooling effect, slower in Cooling Process, cooling temperature is higher, therefore not can guarantee PBT set
The base-material of pipe obtains required just remaining length in decrease temperature crystalline.
Simultaneously in order to guarantee, the heart bundled tube optical cable for applying PBT casing still can satisfy in its tensile property
GYDXTW-96B1: fibre strain≤0.005% at long-term pulling force 600N, optical fiber additional attenuation≤0.03dB；
Fibre strain≤0.15% at short-term pulling force 2400N, optical fiber additional attenuation≤0.1dB；
Optical cable secular strain≤0.20%；
Embodiment 1
The production of PBT casing semi-finished product first, specifically includes the following steps:
Step 1: 1,4- butanediol and terephthalic acid (TPA) are uniformly mixed mixed according to the proportion that molar ratio is 1.0-1.6
Slurry after conjunction；
Step 2: mixed slurry and polymerization catalyst one being played and carry out esterification in reaction kettle of the esterification, are esterified
Temperature is 200~270 DEG C, and esterification reaction pressure is 10kPa~500kPa；
Step 3: the material after esterification enters prepolymerization reaction kettle and carries out polycondensation reaction, and reaction pressure control is
100Pa~20kPa, reaction temperature are 200 DEG C~260 DEG C；
Step 4: the discharging of prepolymerization reaction kettle enters final polycondensation reaction kettle further progress polycondensation reaction, reaction temperature
It is 200 DEG C~260 DEG C, reaction pressure is 10Pa~1000Pa；
Step 5: the discharging of final polycondensation reaction kettle enters Granulation Equipments granulation, continuously enters solid phase system through metering, passes through
Pre- thermal crystalline, is viscosified subsequently into solid phase reactor, and reaction temperature gradient is 170 DEG C~210 DEG C, and reaction time is
15~20 hours, obtain PBT base-material；
Step 6: several optical fiber are bonded together to form fiber optic bundle by binder with belt-like form arrangement, are used
Extruding machine is enclosed with PBT base-material in the outside for the fiber optic bundle for being coated with the fiber paste that blocks water and obtains optical fiber loose tube PBT semi-finished product；
Step 7: optical fiber loose tube PBT semi-finished product are transferred at once small to low-temperature treatment 2 is done in -40 ° of low temperature of incubator
When；
Step 8: taking out casing immediately after the completion of low-temperature treatment, outer shield two sides parallel steel wire tension is drawn to 20kg, while quasi-
Get corresponding mold ready；The parallel steel wire in two sides is controlled by the magnetic powder brake of steel wire pay-off stand, can be accurately controlled steel wire
Tension reach 20kg；If going to draw using spring scale, value of thrust fluctuation is big, undesirable；If 20g, which is not achieved, in pulling force to lead
Causing finished product to leave appearance integrally can be in bending, and the Loose tube to internal layer is also to have compressing, is caused unqualified；Defective item
There is step in mainly segment difference, i.e. transmission graph curve, this can make signal give a discount；
Step 9: casing unwrapping wire uses zero tension stringing, i.e. only straining pulley or dancing wheel；In this step, but
Straining pulley or dancing wheel are that straining pulley eats up remaining length in order to prevent, reduce the remaining length in most；Form PBT Loose tube finished product.
Step 1 to step 7 is the production stage of existing PBT optical fiber loose tube in above-mentioned steps, using PBT optical fiber
Loose tube finished product A prepares heart bundled tube optical cable A, specifically includes the following steps: using extruding machine in PBT optical fiber loose tube finished product A
Outside be successively enclosed with waterstop, steel aluminium strip and highly dense PE layer of outer shield from the inside to the outside, the high density polyethylene (HDPE) is by 260
DEG C outer nurse's skill squeeze out, highly dense PE layer of the outer shield is provided with reinforcer along its length, and the reinforcer is that phosphatization applies
The single steel wire of layer.
Embodiment 2
The present embodiment difference from example 1 is that: step 7: the optical fiber loose tube PBT semi-finished product after increasing stick are
It is transferred at quarter to doing low-temperature treatment 3 hours in -40 ° of low temperature of incubator；It is other same as Example 1.
Heart bundled tube optical cable B is prepared using PBT optical fiber loose tube finished product B, remaining step is same as Example 1.
Embodiment 3
The present embodiment and embodiment 2 the difference is that: step 7: the optical fiber loose tube PBT semi-finished product after increasing stick are
It is transferred at quarter to low-temperature treatment is done 5 hours in -40 ° of low temperature of incubator, remaining step is same as Example 2, prepares PBT optical fiber pine set
Pipe finished product C.
Heart bundled tube optical cable C is prepared using PBT optical fiber loose tube finished product C.
Embodiment 4
The present embodiment and embodiment 2 the difference is that: step 7: the optical fiber loose tube PBT semi-finished product after increasing stick are
It is transferred at quarter to low-temperature treatment is done 8 hours in -40 ° of low temperature of incubator, remaining step is same as Example 2, prepares PBT optical fiber pine set
Pipe finished product D.
Heart bundled tube optical cable D is prepared using PBT optical fiber loose tube finished product D.
Embodiment 5
The present embodiment and embodiment 2 the difference is that: step 7: the optical fiber loose tube PBT semi-finished product after increasing stick are
It is transferred at quarter to low-temperature treatment is done 9 hours in -40 ° of low temperature of incubator, remaining step is same as Example 2, prepares PBT optical fiber pine set
Pipe finished product E.
Heart bundled tube optical cable E is prepared using PBT optical fiber loose tube finished product E.
Embodiment 6
The present embodiment and embodiment 2 the difference is that: optical fiber loose tube PBT semi-finished product do not carry out low-temperature treatment, i.e.,
Do not carry out the operation of step 7 to step 10, other the step of it is identical to step 6 as step 1, prepare PBT optical fiber loose tube
Finished product F.Heart bundled tube optical cable F is prepared using PBT optical fiber loose tube finished product F.
Embodiment 7
To PBT optical fiber loose tube finished product A, PBT optical fiber loose tube finished product B prepared in embodiment 1 and embodiment 6,
PBT optical fiber loose tube finished product C, PBT optical fiber loose tube finished product D and PBT optical fiber loose tube finished product E and PBT optical fiber loose tube finished product F
Remaining long detection is carried out respectively.
Testing tool includes: remaining long testboard and blade.Test temperature: 25 DEG C.
Sampling: PBT optical fiber loose tube finished product A, PBT optical fiber loose tube finished product B, PBT optical fiber loose tube finished product C, PBT optical fiber
After Loose tube finished product D and PBT optical fiber loose tube finished product E and PBT optical fiber loose tube finished product F distinguishes lower wall, first by end doubling, use
Adhesive tape is wound, around 8 meters of lower loose tube, equally by 8 meters of the casing of releasing of end doubling, after being wound with adhesive tape on rear side of adhesive tape
It cuts.
Measurement: 1, according to the specification of Loose tube, one end selects the counterweight of different weight, what Loose tube specification and counterweight selected
Relationship is shown in Table 1；
The matching relationship of table 1 Loose tube specification and counterweight weight
2,8 meters of casings of sampling are placed on remaining long testboard, both ends are clamped with crocodile clip, notice that Loose tube should be at this time
In the V-groove of remaining long testboard, and both ends need to reserve same length；
3, after fixing sample, Loose tube is vertically cut simultaneously at 0 scale at remaining long testboard both ends with blade；
4, sample is removed from remaining long testboard, optical fiber is extracted out from casing side, pay attention to when taking pumping it is firmly uniform,
By optical fiber wiping machine paper wiped clean while extraction；
5, optical fiber one end of extraction is fixed at 0 scale of remaining long testboard, then with appropriate tension by the light of extraction
Fibre is straightened, and reads the scale Δ of the remaining long testboard other end；
Remaining length is calculated, formula is as follows:
Remaining length (‰)=(fiber lengths-Loose tube length)/Loose tube length * ‰
Simple calculating formula: remaining length (‰)=Δ * 0.2, test result is as shown in table 2.
2 embodiment 1 of table to embodiment 6 Loose tube more than long test result
According to the result shown in table 2, by this method treated Loose tube under the specification of same grade, remaining length and length
The Loose tube being prepared under conventional method, it can be seen that, it is that can accord with carrying out semi-finished product processing to Loose tube semi-finished product
Guarantee remaining long effective growth in the case where standardization.Illustrate this mistake that super low temperature is immediately entered after semi-finished product generate
Cheng Zhong, PBT casing generate biggish huge contraction, this obtained it is required just remaining long, and in this method there are one
Most important step be casing unwrapping wire using zero tension stringing, i.e. only straining pulley or dancing wheel, at ultralow temperature
Reason replaces conventional casing unwrapping wire to walk from straining pulley, can either generate contraction, and can prevent straining pulley from eating up remaining length.
Embodiment 8
On the basis of the above, to using, a process for preparing the heart bundled tube optical cable A come, heart bundled tube optical cable B, the hearts to restrain
Formula optical cable C, heart bundled tube optical cable D and heart bundled tube optical cable E carry out light characteristic detection.Heart bundled tube optical cable A, heart bundled tube optical cable
B, stretching experiment detection light characteristic is done after heart bundled tube optical cable C, heart bundled tube optical cable D and heart bundled tube optical cable E room temperature are offline
(1550nm wavelength) detection 5 groups of identical conditions data of room temperature are as shown in table 3 below, every kilometer of pad value of optical fiber (dB/km) data root
It is qualified to examine according to 1550nm standard≤0.22dB/km.
The every kilometer of pad value of optical fiber of 3 embodiment 1 of table into embodiment 6
Embodiment 9
To using, a process for preparing the heart bundled tube optical cable A come, heart bundled tube optical cable B, heart bundled tube optical cable C, heart pipe
Bundle cable D and heart bundled tube optical cable E such as is stretched, is flattened, being impacted at a series of mechanics properties testing, the test result such as table
Shown in 4.
4 embodiment 1 of table to embodiment 6 heart bundled tube optical cable mechanics properties testing data
It is found by table 4, the every mechanical property for the heart bundled tube optical cable that this method prepares all is satisfactory
And the additional attenuation of optical fiber, strain, optical fiber overstrain are all effectively improved, while sheath is opened without eyesight is visible
It splits.
In conclusion by the present invention in that improving the method for casing property with low-temperature treatment semi-finished product, so that long more than casing
It is improved substantially originally, performance improvement is obvious after finished product production and stability.
Claims (7)
1. a kind for the treatment of process of PBT casing, which is characterized in that specifically includes the following steps:
Step 1: after 1,4- butanediol and terephthalic acid (TPA) are uniformly mixed to mix according to the proportion that molar ratio is 1.0-1.6
Slurry；
Step 2: mixed slurry and polymerization catalyst one are played and carry out esterification, esterification temperature in reaction kettle of the esterification
It is 200~270 DEG C, esterification reaction pressure is 10kPa~500kPa；
Step 3: the material after esterification enter prepolymerization reaction kettle carry out polycondensation reaction, reaction pressure control be 100Pa~
20kPa, reaction temperature are 200 DEG C~260 DEG C；
Step 4: the discharging of prepolymerization reaction kettle enters final polycondensation reaction kettle further progress polycondensation reaction, reaction temperature 200
DEG C~260 DEG C, reaction pressure is 10Pa~1000Pa；
Step 5: the discharging of final polycondensation reaction kettle enters Granulation Equipments granulation, solid phase system is continuously entered through metering, by preheating
Crystallization, viscosified subsequently into solid phase reactor, reaction temperature gradient be 170 DEG C~210 DEG C, reaction time be 15~
20 hours, obtain PBT base-material；
Step 6: several optical fiber are bonded together to form fiber optic bundle by binder with belt-like form arrangement, using extrusion molding
Machine is enclosed with PBT base-material in the outside for the fiber optic bundle for being coated with the fiber paste that blocks water and obtains optical fiber loose tube PBT semi-finished product；
Step 7: optical fiber loose tube PBT semi-finished product are transferred at once to doing low-temperature treatment 3-8 hours in -40 ° of low temperature of incubator；
Step 8: taking out casing immediately after the completion of low-temperature treatment, outer shield two sides parallel steel wire tension draws to 20kg, is ready to simultaneously
Corresponding mold；
Step 9: casing unwrapping wire uses zero tension stringing, i.e. only straining pulley or dancing wheel；Form PBT Loose tube finished product.
2. a kind for the treatment of process of PBT casing according to claim 1, which is characterized in that the low temperature in the step 8
The time of processing is 4 hours.
3. a kind of application for the PBT casing for having high tensile property that treatment process using claims 1 or 2 is prepared,
Be characterized in that, centered on beam tube type cable use material.
4. a kind of heart bundled tube optical cable for having high tensile property, is prepared using PBT casing as described in claim 1,
It is characterized in that, being successively enclosed with waterstop and steel aluminium strip from the inside to the outside in the outside of PBT Loose tube using extruding machine, then
In outer nurse's skill by 250 DEG C -270 DEG C, high density polyethylene (HDPE) is squeezed out.
5. a kind of heart bundled tube optical cable for having high tensile property according to claim 4, which is characterized in that the outer shield
Highly dense PE layers is provided with reinforcer along its length.
6. a kind of heart bundled tube optical cable for having high tensile property according to claim 4, which is characterized in that the bonding
Agent is epoxy resin cure glue.
7. a kind for the treatment of process of PBT casing according to claim 4, which is characterized in that the outer shield technological temperature is
260℃。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910519470.1A CN110244420B (en) | 2019-06-17 | 2019-06-17 | Treatment process and application of PBT (polybutylene terephthalate) sleeve and central beam tube type optical cable containing PBT sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910519470.1A CN110244420B (en) | 2019-06-17 | 2019-06-17 | Treatment process and application of PBT (polybutylene terephthalate) sleeve and central beam tube type optical cable containing PBT sleeve |
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| Publication Number | Publication Date |
|---|---|
| CN110244420A true CN110244420A (en) | 2019-09-17 |
| CN110244420B CN110244420B (en) | 2020-05-19 |
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| CN201910519470.1A Active CN110244420B (en) | 2019-06-17 | 2019-06-17 | Treatment process and application of PBT (polybutylene terephthalate) sleeve and central beam tube type optical cable containing PBT sleeve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432763A (en) * | 2020-12-09 | 2021-03-02 | 南京华信藤仓光通信有限公司 | Butterfly cable qualification judging method based on optical fiber length and attenuation detection |
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| CN102675608A (en) * | 2011-03-10 | 2012-09-19 | 中国石油化工集团公司 | Method for preparing material special for polybutylene terephthalate (PBT) optical fiber loose tubes |
| CN203324547U (en) * | 2013-07-25 | 2013-12-04 | 杭州富通通信技术股份有限公司 | Novel FTTH (Fiber to the Home)-used 8-shaped optical cable and die thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2288456Y (en) * | 1996-01-06 | 1998-08-19 | 孙泽民 | Centre pipe type small composite optical cable for railway |
| US20080087047A1 (en) * | 2003-07-14 | 2008-04-17 | Massachusetts Institute Of Technology | Optoelectronic fiber codrawn from conducting, semiconducting, and isulating materials |
| CN102675608A (en) * | 2011-03-10 | 2012-09-19 | 中国石油化工集团公司 | Method for preparing material special for polybutylene terephthalate (PBT) optical fiber loose tubes |
| CN202049267U (en) * | 2011-04-27 | 2011-11-23 | 山东太平洋光缆有限公司 | Flat loose tube optical fiber band communication optical cable |
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| CN203324547U (en) * | 2013-07-25 | 2013-12-04 | 杭州富通通信技术股份有限公司 | Novel FTTH (Fiber to the Home)-used 8-shaped optical cable and die thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432763A (en) * | 2020-12-09 | 2021-03-02 | 南京华信藤仓光通信有限公司 | Butterfly cable qualification judging method based on optical fiber length and attenuation detection |
| CN112432763B (en) * | 2020-12-09 | 2023-12-08 | 南京华信藤仓光通信有限公司 | Butterfly cable qualification judging method based on optical fiber length and attenuation detection |
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