CN1414405A - Gradational plastic optical fibre multi-layer compound extrusion moulding process - Google Patents
Gradational plastic optical fibre multi-layer compound extrusion moulding process Download PDFInfo
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- CN1414405A CN1414405A CN 01144812 CN01144812A CN1414405A CN 1414405 A CN1414405 A CN 1414405A CN 01144812 CN01144812 CN 01144812 CN 01144812 A CN01144812 A CN 01144812A CN 1414405 A CN1414405 A CN 1414405A
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Abstract
A graded index plastic fiber is a plastic optical fiber with the refractive index being gradual changed radially. The distribution of the refractive index being gradual changed in realized by using the diffusible molecules possessing the different refractive indexes as the refractive index regulator. Different amount of the regulator is diluted into the matrix of polymer so as to obtain the polymers with different refractive indexes. With the multiplex extruders being used, the polymers enters the feeding gate, which is in the shape of the central hole and multiple layer of annular openings, through the composite cavity and the cone-shaped extrusion exit. Thus, the transparent polymer with the core in the center and multiple layers in different refractive indexes being wrapped is obtained so as to form the graded index plastic fiber with its refractive index being distributed in parabola shape.
Description
Technical field
The present invention relates to the production technology of gradational plastic optical fibre.
Background technology
Glass optical fiber has been widely used in long range information and has propagated.But because the core diameter of glass optical fiber is little, the interfacing equipment costliness connects difficulty, and it is consuming time to take a lot of work, and has greatly increased the integrated cost of glass optical fiber transmission system when optical fiber is registered one's residence, and is difficult to the preferred material of registering one's residence as optical fiber.Plastic optical fiber can be made into 1 millimeter large core fiber with its good toughness, make to connect easily, and interfacing equipment is cheap, links simple and easy to do and has caused that people pay attention to widely.Early stage saltant plastic optical fiber because its fibre core has the refractive index of uniformity, causes bigger modal dispersion, has limited transfer rate.Thereby the development research of gradational plastic optical fibre becomes the focus of people's research.Existing a large amount of at present bibliographical informations is made the technology of gradational plastic optical fibre, as interface gel method, diffusion method etc.But these technology all adopt the technology of substep, and technology is loaded down with trivial details to be difficult to form serialization production, and product quality is difficult to stable control.
Langxun Technology Ltd had once applied for " being used to produce the method for a plastic optical fiber " patent of invention (CN1275479A) on Dec 6th, 2000 in China.Their technology is to adopt the macromolecular material of two kinds of different refractivities to extrude simultaneously, again by a high temperature cavity, makes that the micromolecule in the macromolecular material spreads the index distribution that obtains satisfaction under molten condition.This just needs diffusion chamber that enough slow of enough length or rate of extrusion will be arranged, and just can obtain index distribution preferably, has therefore also limited speed of production.This micromolecule that leans on fully spreads to the full-bodied molten mass of another kind from a kind of full-bodied molten mass, is to be difficult to obtain perfect index distribution, and can't the regulated at will index distribution.
Pi Shiteli optical fiber company limited once reported polymer optical fiber and preparation method thereof (patent publication No. CN1087726) in 1994, their method is the technology of substep.At first they make prefabricated polymer optical fiber by extruding the first and second straight polymer material layers, the prefabricated polymer optical fiber cooling that will obtain then, and the cooling device of employing is the water smoke that is used to provide molecular size, and prefabricated fiber is passed through.Because water smoke has contacted prefabricated fiber, makes molecule begin evaporation process, thereby the heat of prefabricated fiber is left.Second step placed prefabricated fiber another device through a heating furnace again, made prefabricated polymer fiber become the last polymer optical fiber that required gradient optical index distributes.Since their technology be distribute and cool off prefabricated fiber with water smoke during the course, this has all increased the contaminated chance of polymer fiber, this is to make the fatal defective of optical fiber.In addition, the repeatability of also restive each batch of Fen Bu technology product and the stability of performance.It is to be difficult to obtain level and smooth index distribution that refractive index is regulated in diffusion between the employing straight polymer.
Summary of the invention
In view of above-mentioned, but task of the present invention provides a kind of manufacturing process with quantity-produced gradational plastic optical fibre of industrially scalable, and it can be controlled effectively to the index distribution of optical fiber.
Task of the present invention is achieved through the following technical solutions:
A kind of gradational plastic optical fibre multi-layer compound extrusion moulding process is characterized in that:
The transparent polymer master batch that the n kind is had different refractivity, add n platform extruder respectively, and extruded through a composite die by extruder separately respectively, become and have the fibrous of n layer, the diameter of fiber is from 0.2mm to 3mm, wherein, n 〉=3 and n≤100, polymer masterbatch is similar polymers or polymer masterbatch not of the same race.
Employed composite die in a kind of gradational plastic optical fibre multi-layer compound extrusion moulding process is characterized in that: this composite die is made up of with annular feeding mouth, Compound Cavity, the tapered extrusion of core a center hole, n layer.The length of Compound Cavity is from 1mm to 2M, and its diameter is from 0.2mm to 50mm.
In addition:
The transparent polymer master batch of n kind different refractivity respectively by separately extruder after a composite die is extruded synchronously, can stretch become through traction engine again has the fibrous of n layer.
N kind polymer masterbatch, its variations in refractive index are n
0＞n
1＞n
2＞n
3...＞n
nOr n
0＜n
1＜n
2＜n
3...＜n
nOr be arbitrarily arrangement.
Can n will be had
0The polymkeric substance centering circular hole place of refractive index has n
1The polymkeric substance of refractive index places the ground floor near center hole, has n
2The polymkeric substance of refractive index places the second layer near center hole, and the rest may be inferred.
Also can n will be had
0The polymkeric substance centering circular hole place of refractive index has n
1The polymkeric substance of refractive index places the ground floor near center hole, has n
2The polymkeric substance of refractive index places the second layer near center hole, and the rest may be inferred.
Advantage of the present invention:
Because manufacturing process of the present invention can change the refractive index height of extruding the number of plies and every layer, thereby can obtain desirable index distribution.When the control number of plies is abundant, then do not need this process of diffusion chamber can obtain level and smooth Parabolic index distribution yet.Can get the plastic optical fiber of the index distribution of special requirement by the refractive index of every layer of any change.
MULTILAYER COMPOSITE coextrusion of the present invention is made optical fiber fabrication technology and is had random adjustability of refractive index and controllability, because manufacturing process itself has continuity, so reduced optical fiber contaminated chance in process of production.
Description of drawings
Fig. 1 is the transverse cross-sectional view of the structure of composite die;
Fig. 2 is the gradational plastic optical fibre refractive index profile.
Embodiment
The invention provides a kind of MULTILAYER COMPOSITE and extrude the continuous production processes of making gradational plastic optical fibre.In this technology: the transparent polymer master batch that the n kind has different refractivity adds n platform extruder respectively, and extruded through a composite die by extruder separately respectively, become and have the fibrous of n layer, the diameter of fiber is from 0.2mm to 3mm, wherein, n 〉=3 and n≤100, polymer masterbatch are similar polymers or polymer masterbatch not of the same race.
Composite die is made up of a center pit and n concentric circles that varies in size, and thus, is divided into the n layer from inside to outside round center pit, and the innermost layer is a ground floor, is the second layer secondly, and the like, can reach 100 layers.
The polymkeric substance of maximum refractive index is squeezed into the center pit part in the composite die, the polymkeric substance of second high index of refraction is squeezed into the ground floor in the composite die, the polymkeric substance of the 3rd high index of refraction is squeezed into the second layer in the composite die, and the like, so form the plastic optical fiber that refractive index is gradual change.The plastic optical fiber of this structure has the distribution situation that refractive index diminishes than marine crab grain circumferential edge gradually from the edge, center, and its result produces the plastic optical fiber that self focusing-type light is propagated.
In addition, the technology that also can adopt refractive index oppositely to distribute, be that the polymkeric substance of lowest refractive index is squeezed into the center pit part in the composite die, the polymkeric substance of next to the lowest refractive index is squeezed into the ground floor in the composite die, the polymkeric substance of the 3rd low refractive index is squeezed into the second layer in the composite die, and the like, can reach 100 layers.So just, obtaining refractive index is that water caltrop is blind from the center along hunt the storehouse small drum used in the army in ancient China mythical bird like the phoenix ピ disagreement earthworm of grinning than marine crab, and its result of arrange Shun produces the gradational plastic optical fibre that light is dispersed propagation.
By to the parameter of expressing technique such as temperature, flow velocity, and composite die head, Compound Cavity, extrude the port accuracy control over temperature, can form the variation that index distribution is the parabolic type uniform and stable, reach the gradational plastic optical fibre of needs of expected design.
Technology involved in the present invention is made up of following several steps:
At first preparation contains the polymer monomer solution of variable concentrations refractive index correctives, after the polymerization, obtains having the superpolymer master batch of different refractivity.Usually the polymerizing master batch (n＞2) that needs the above different refractivity of preparation n kind.
The superpolymer master batch that then these is had a different refractivity places extruder separately respectively, needs n above extruder usually.These extruders are connected respectively on center hole and the composite die of each layer with core annular feeding mouth, the superpolymer master batch is extruded through each extruder and is entered in the Compound Cavity, move to along Compound Cavity on the termination mould of Compound Cavity, obtain fibrous optical fiber through traction again.Wherein Compound Cavity length is from 1mm to 2m, and its diameter is from 0.2mm to 50mm.
Embodiment:
At first prepare 6 kinds of methyl methacrylate solution that contain variable concentrations refractive index correctives.The mass percentage concentration of correctives is respectively: 25%, 20%, 15%, 10%, 5%, 0%.Selecting bromobenzene is the refractive index correctives.130 ℃ of following polymerizations 10 hours, obtain having the superpolymer master batch of different refractivity.Then these the 6 kinds superpolymer master batches with different refractivity are placed extruder separately respectively.Be pressed against in the Compound Cavity through the composite die head.Move to Compound Cavity termination mould along Compound Cavity.The horizontal section synoptic diagram of composite die head is provided by Fig. 1.The diameter of Compound Cavity is 20mm, and length is 10mm, and the diameter in exit is 3mm.Obtain the fibrous optical fiber of 1mm through traction.The index distribution of optical fiber is provided by Fig. 2.
Among Fig. 1:
PN0: polymeric layer with maximum refractive index n0;
PN1: ground floor has the polymkeric substance of n1 refractive index;
PN2: the second layer has the polymkeric substance of n2 refractive index;
PN3: the 3rd layer of polymkeric substance with n3 refractive index;
PN4: outermost layer has the polymkeric substance of n4 refractive index.
The foregoing description only for explanation the present invention is, is not to be used to limit scope of patent protection of the present invention, for any equivalents of doing according to the foregoing description, and all should be within scope of patent protection of the present invention.
Claims (9)
1. gradational plastic optical fibre multi-layer compound extrusion moulding process is characterized in that:
The transparent polymer master batch that the n kind is had different refractivity, add n platform extruder respectively, and extruded through a composite die by extruder separately respectively, become and have the fibrous of n layer, the diameter of fiber is from 0.2mm to 3mm, wherein, n＞3 and n≤100, polymer masterbatch is similar polymers or polymer masterbatch not of the same race.
2. gradational plastic optical fibre multi-layer compound extrusion moulding process as claimed in claim 1, it is characterized in that: the transparent polymer master batch of n kind different refractivity respectively by separately extruder after a composite die is extruded synchronously, stretching to become through traction engine again has the fibrous of n layer.
3. gradational plastic optical fibre multi-layer compound extrusion moulding process as claimed in claim 1 or 2 is characterized in that: the transparent polymer master batch of n kind different refractivity, its variations in refractive index are n
0＞n
1＞n
2＞n
3...＞n
n
4. gradational plastic optical fibre multi-layer compound extrusion moulding process as claimed in claim 1 or 2 is characterized in that: the transparent polymer master batch of n kind different refractivity, its variations in refractive index are n
0＜n
1＜n
2＜n
3...＜n
n
5. gradational plastic optical fibre multi-layer compound extrusion moulding process as claimed in claim 1 or 2 is characterized in that: the transparent polymer master batch of n kind different refractivity, its variations in refractive index are arrangement arbitrarily.
6. gradational plastic optical fibre multi-layer compound extrusion moulding process as claimed in claim 3 is characterized in that: have n
0The polymkeric substance centering circular hole place of refractive index has n
1The polymkeric substance of refractive index places the ground floor near center hole, has n
2The polymkeric substance of refractive index places the second layer near center hole, and the rest may be inferred.
7. gradational plastic optical fibre multi-layer compound extrusion moulding process as claimed in claim 4 is characterized in that: have n
0The polymkeric substance centering circular hole place of refractive index has n
1The polymkeric substance of refractive index places the ground floor near center hole, has n
2The polymkeric substance of refractive index places the second layer near center hole, and the rest may be inferred.
8. employed composite die in the gradational plastic optical fibre multi-layer compound extrusion moulding process, it is characterized in that: this composite die is made up of with annular feeding mouth, Compound Cavity, the tapered extrusion of core a center hole, n layer.
9. composite die as claimed in claim 8 is characterized in that: the length of described Compound Cavity is from 1mm to 2M, and its diameter is from 0.2mm to 50mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144812 CN1236333C (en) | 2001-12-24 | 2001-12-24 | Gradational plastic optical fibre multi-layer compound extrusion moulding process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01144812 CN1236333C (en) | 2001-12-24 | 2001-12-24 | Gradational plastic optical fibre multi-layer compound extrusion moulding process |
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| CN1414405A true CN1414405A (en) | 2003-04-30 |
| CN1236333C CN1236333C (en) | 2006-01-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303440C (en) * | 2003-05-29 | 2007-03-07 | 三星电子株式会社 | Photonic crystal fiber preform and photonic crystal fiber manufactured using the same |
| CN102114708A (en) * | 2009-12-31 | 2011-07-06 | 中国科学院理化技术研究所 | Method and device for continuously preparing organic polymer optical fiber with refractive index gradually changing along radial direction |
| CN107561634A (en) * | 2017-09-12 | 2018-01-09 | 厦门华方软件科技有限公司 | Ultrahigh speed communication polymer optical fiber and preparation method thereof |
| CN110716261A (en) * | 2019-09-18 | 2020-01-21 | 东南大学 | Multilayer flexible waveguide writing device and preparation method of multi-cladding polymer waveguide |
| CN114603890A (en) * | 2020-12-08 | 2022-06-10 | 深南电路股份有限公司 | Manufacturing device of organic optical waveguide element and spray head assembly thereof |
-
2001
- 2001-12-24 CN CN 01144812 patent/CN1236333C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1303440C (en) * | 2003-05-29 | 2007-03-07 | 三星电子株式会社 | Photonic crystal fiber preform and photonic crystal fiber manufactured using the same |
| CN102114708A (en) * | 2009-12-31 | 2011-07-06 | 中国科学院理化技术研究所 | Method and device for continuously preparing organic polymer optical fiber with refractive index gradually changing along radial direction |
| CN107561634A (en) * | 2017-09-12 | 2018-01-09 | 厦门华方软件科技有限公司 | Ultrahigh speed communication polymer optical fiber and preparation method thereof |
| CN107561634B (en) * | 2017-09-12 | 2023-06-20 | 厦门华方软件科技有限公司 | Polymer optical fiber for ultra-high speed communication and preparation method thereof |
| CN110716261A (en) * | 2019-09-18 | 2020-01-21 | 东南大学 | Multilayer flexible waveguide writing device and preparation method of multi-cladding polymer waveguide |
| CN110716261B (en) * | 2019-09-18 | 2022-03-18 | 东南大学 | Multilayer flexible waveguide writing device and preparation method of multi-cladding polymer waveguide |
| CN114603890A (en) * | 2020-12-08 | 2022-06-10 | 深南电路股份有限公司 | Manufacturing device of organic optical waveguide element and spray head assembly thereof |
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| Publication number | Publication date |
|---|---|
| CN1236333C (en) | 2006-01-11 |
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