CN115636600B - Coating die for low-speed low-tension drawing of large-core-diameter optical fiber - Google Patents
Coating die for low-speed low-tension drawing of large-core-diameter optical fiber Download PDFInfo
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- CN115636600B CN115636600B CN202211238815.4A CN202211238815A CN115636600B CN 115636600 B CN115636600 B CN 115636600B CN 202211238815 A CN202211238815 A CN 202211238815A CN 115636600 B CN115636600 B CN 115636600B
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- 238000000576 coating method Methods 0.000 title claims abstract description 122
- 239000011248 coating agent Substances 0.000 title claims abstract description 119
- 239000013307 optical fiber Substances 0.000 title claims abstract description 62
- 230000007704 transition Effects 0.000 claims abstract description 18
- 239000000835 fiber Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 20
- 238000012681 fiber drawing Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 13
- 238000005491 wire drawing Methods 0.000 description 10
- 239000010432 diamond Substances 0.000 description 9
- 229910003460 diamond Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 238000005253 cladding Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000007380 fibre production Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007607 die coating method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Landscapes
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention discloses a coating die for low-speed low-tension drawing of a large-core optical fiber, which comprises a die body, wherein the die body sequentially comprises an inner part and an outer part from inside to outside; the inside of the die comprises an upper inlet die surface, an upper inner hole coating diversion round edge, a lower inner hole coating diversion round edge, an inner die hole, a lower inner die hole outlet lower plane, a lower opening abdication step and a lower bottom edge from top to bottom in sequence; the outer part of the die sequentially comprises an upper inlet outer circle bevel edge transition table, an outer circle positioning die edge, an outer circle table top round mouth, an outer placing table top and an outer circle inner die edge from top to bottom. The coating die for low-speed low-tension drawing of the large-core-diameter optical fiber has the advantages of flexible use process, simple and convenient assembly, strong consistency of assembly stability, greatly improved production efficiency, reduced cost of the optical fiber drawing process and more effective guarantee of optimal performance of the optical fiber.
Description
Technical Field
The invention belongs to the technical field of optical fiber manufacturing, and particularly relates to a coating die for low-speed and low-tension drawing of a large-core-diameter optical fiber.
Background
The optical fiber drawing process refers to the process operation process that the prefabricated rod prepared in the previous process is heated and softened by a high-temperature furnace and then is drawn into the optical fiber with the diameter compounding requirement, and the core/cladding diameter ratio and the refractive index distribution form of the optical fiber are ensured to be unchanged.
The drawing die is a die which is needed to be used in the optical fiber drawing process, and the coating process in the optical fiber production process generally comprises the steps of coating the heated coating on the optical fiber through the optical fiber die in sequence for two times to form an inner coating and an outer coating of the optical fiber, wherein the optical fiber die is used as a core device for optical fiber coating and plays a decisive role in optical fiber coating.
The prior optical fiber coating device has complex internal structure, and the coating in a fluid state after being heated is easy to form bubbles at the beginning stage of being pumped into an optical fiber mould under the action of a booster pump of a central feeding system. The existence of bubbles in the optical fiber coating layer can affect the strength of the optical fiber, the optical fiber transmission performance at high and low temperatures and the service life of the optical fiber, and seriously affect the quality of the optical fiber, so that the elimination of the bubbles in the optical fiber coating is an important link in the quality control of the optical fiber production. For eliminating bubbles, the problem of the prior production process is generally solved by a mode of pre-discharging paint, but in the actual operation process, if the paint discharging time is short, the defect of the coating quality of the optical fiber can be caused, and the long paint discharging time can cause more paint waste.
In addition, along with the rapid development of large-size energy-transfer optical fibers and rare earth doped optical fibers, the diameter of a quartz glass cladding breaks through 1mm, various requirements exist for the proportion of coating diameters of users, a large number of different dies are needed to finish drawing tasks of different coating sizes, all foreign drawing coating dies are imported at present, the foreign drawing coating dies are quite expensive, the purchasing period is long, and when in error operation, the cost is high, meanwhile, the current drawing die design is mainly designed for the 125-micron cladding diameter of a common single-mode optical fiber and high-speed drawing, and the low-speed low-tension thin coating drawing process requirements of the large-core optical fiber cannot be met.
Disclosure of Invention
The invention aims to solve the problems and provide the coating die for the low-speed low-tension drawing of the large-core optical fiber, which has flexible use process, simple and convenient assembly and strong consistency of assembly stability, greatly improves the production efficiency, reduces the cost of the optical fiber drawing process and more effectively ensures that the optical fiber achieves the optimal performance.
The invention realizes the above purpose through the following technical scheme:
a coating die for low-speed low-tension drawing of large-core optical fibers comprises a die body, wherein the die body sequentially comprises an inner part and an outer part from inside to outside;
the inside of the die comprises an upper inlet die surface, an upper inner hole coating diversion round edge, a lower inner hole coating diversion round edge, an inner die hole, a lower inner die hole outlet lower plane, a lower opening abdication step and a lower bottom edge from top to bottom in sequence; the outer part of the die sequentially comprises an upper inlet outer circle bevel edge transition table, an outer circle positioning die edge, an outer circle table top round mouth, an outer placing table top and an outer circle inner die edge from top to bottom.
Preferably, the upper inlet die surface is designed in a horizontal plane, and the depth of the upper inlet die surface is 1-5mm.
As the preference of this embodiment, the upper circular edge of the inner hole coating diversion adopts a convex arc surface design, the convex arc radius is 3-30mm, and the angle of the circular edge is 5-35 degrees.
As the preference of this embodiment, the round edge under the inner hole coating water conservancy diversion adopts concave arc surface design, and concave arc radius is 5-80mm, and the arc edge angle is 8-60.
As the preference of the embodiment, the internal mold hole adopts a vertical plane design, the joint transition area between the internal mold hole and the lower round edge of the inner hole coating guide flow adopts a round corner design, and the diameter of the internal mold hole is 200-2000 mu m.
As the preference of the embodiment, the lower plane of the outlet of the internal mold hole adopts a horizontal plane design, and the depth of the lower plane of the outlet of the internal mold hole is 0.5-3mm; the lower opening abdication step adopts a vertical plane design, and the height of the lower opening abdication step is 1-5mm; the lower bottom edge of the die adopts a horizontal plane design, and the depth of the lower bottom edge is 1-10mm.
As the preferable mode of the embodiment, the upper inlet outer circle bevel edge transition table adopts a corner rounding and bevel edge over design mode, the corner rounding radius is 0.2-2.0mm, and the bevel edge angle is 3-15 degrees.
As the preference of this embodiment, the outer circle positioning die edge adopts the vertical plane design, the outer circle positioning die edge height is 1-5mm, and the inside central multilayer structure of the mould is all concentric with the outer circle positioning die edge.
As the preference of the embodiment, the radius of the round angle of the round opening of the outer table top of the outer circle is 0.1-2.0mm; the outer placing table top adopts a horizontal plane design, and the depth of the outer placing table top is 1-4mm.
As the preference of this embodiment, the outer circle internal mold edge adopts a vertical plane design, the outer circle internal mold edge and the outer circle positioning mold edge are parallel and concentric, and the depth of the outer circle internal mold edge is 1-15mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the coating die for the low-speed low-tension wire drawing of the large-core optical fiber, disclosed by the invention, the coating diversion effect of the die on the coating is enhanced through the convex arc surface design of the upper round edge of the inner hole coating diversion of the die, residual bubbles in the coating are rapidly extruded and removed through the carbon dioxide airflow flowing on the upper plane of the die, so that the bubble residues in the coating are reduced or even eliminated, meanwhile, the convex arc surface design of the upper round edge of the inner hole coating diversion can be used for effectively improving the fiber quartz glass infiltration effect of the coating coated convex sphere infiltration surface, and the loss of the coating is reduced.
(2) According to the coating die for the low-speed low-tension wire drawing of the large-core optical fiber, disclosed by the invention, through the concave arc surface design of the inner hole coating diversion round edge of the die, the coating pressure effect of the die on the surface of the quartz glass of the optical fiber is enhanced, so that the coating is uniformly and symmetrically wrapped, the centering effect of the reinforced optical fiber is strengthened by the increased pressure tenderness, the concentricity performance of the coating is improved, the diamond coating is adopted for strengthening, the smoothness and the abrasion resistance of the surface are improved, the abrasion and the surface defects of the inner hole coating diversion round edge in the coating process of the large-flow coating large-core optical fiber are reduced, and the coating quality is improved.
(3) According to the coating die for the low-speed low-tension drawing of the large-core optical fiber, disclosed by the invention, the overflow of the coating in the process of demolding at the lower opening of the inner die hole can be reduced, the die table is polluted by the coating, the assembly of the die and the die table in the process of drawing and coating for a long time is stable, and the assembly precision of the die and the concentricity performance of the coating are improved.
(4) The coating die for low-speed and low-tension drawing of the large-core optical fiber has the advantages of flexible use process, simple and convenient assembly, strong consistency of assembly stability, greatly improved production efficiency, reduced cost of the optical fiber drawing process and more effective guarantee of the optical fiber reaching the optimal performance.
Drawings
FIG. 1 is a schematic side sectional view of the present invention;
FIG. 2 is a schematic cross-sectional view of an upper die inlet according to the present invention;
FIG. 3 is a schematic cross-sectional view of a lower die opening according to the present invention.
The figure shows: 101. the upper inlet die surface 102, the upper round edge for guiding the inner hole coating, the lower round edge for guiding 104, the inner die hole, 105, the lower plane of the outlet of the inner die hole, 106, the lower opening step, 107, the lower bottom edge, 201, the upper inlet outer circle bevel edge transition table, 202, the outermost layer is an outer circle positioning die edge, 203, an outer circle table top round opening, 204, an outer placing table top, 205 and an outer circle inner die edge.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, an embodiment of the present invention provides a coating die for low-speed and low-tension drawing of a large-core fiber, which includes a die body, in this embodiment, the die body adopts a central symmetrical structure design, the material is stainless steel, the die body sequentially includes an inner part and an outer part from inside to outside, the die inner part sequentially includes an upper inlet die surface 101, an inner hole coating material diversion upper round edge 102, an inner hole coating material diversion lower round edge 103, an inner die hole 104, an inner die hole outlet lower plane 105, a lower opening abdicating step 106, and a lower bottom edge 107 from top to bottom, and the die outer part sequentially includes an upper inlet outer circular bevel edge transition table 201, an outer circular positioning die edge 202, an outer circular table round opening 203, an outer placing table 204, and an outer circular inner die edge 205 from top to bottom. The die body will be described in further detail below.
Referring to fig. 1-3, the upper inlet die surface 101 is designed in a horizontal plane, the depth of the upper inlet die surface 101 is 1-5mm (in this embodiment, the depth of the upper inlet die surface 101 is preferably 2 mm), and the upper inlet die surface 101 performs the function of introducing the coating material, and is assembled with an applicator die (not shown) pressing cap.
Referring to fig. 1-3, the upper circular edge 102 of the inner hole coating material is designed with a convex arc surface, and the convex arc surface of the upper circular edge 102 of the inner hole coating material is designed to balance the pressure configuration of the coating material in the mold. In this embodiment, the convex arc radius is 3-30mm and the arc edge angle is 5-35 ° (in this embodiment, the convex arc radius is 5mm and the arc edge angle is 20 °). The convex arc surface design of the round edge 102 on the inner hole coating diversion can enhance the coating diversion effect of the die, residual bubbles inside the coating are rapidly removed by extrusion through the carbon dioxide airflow flowing on the upper plane of the die, so that the bubble residues inside the coating are reduced or even eliminated, meanwhile, the convex arc surface design of the round edge 102 on the inner hole coating diversion can effectively improve the fiber quartz glass infiltration effect of the coating convex sphere infiltration surface, and reduce the loss of the coating.
In this embodiment, the concave arc surface design is adopted for the lower circular edge 103 of the inner hole coating material guide flow, so that the coating material pressure acts symmetrically with the center of the arc as the center, and the coating material pressure centering effect is enhanced. The radius of the concave arc is 5-80mm and the angle of the circular arc edge is 8-60 ° (in this embodiment, the radius of the convex arc is 40mm and the angle of the circular arc edge is 30 °). The inner hole coating diversion lower round edge 103 of the die adopts a concave arc surface design, the inner hole coating diversion lower round edge 103 plays a role in coating pressure coating, and the coating pressure acts on the coating wrapped by the inner hole coating diversion lower round edge 103 through the inner hole coating diversion lower round edge 103, so that the coating tightly wraps the optical fiber, the pressure is conducted to the outer circle of the optical fiber, the pressure centering effect is generated, the centering pressure effect of the coating material on the optical fiber is enhanced under the condition of low tension wire drawing, and the concentricity of the coating and the optical fiber cladding is improved and enhanced. Further optimizing the present embodiment, the surface of the inner hole coating material guide down round edge 103 is polished and diamond coating strengthening is performed, wherein the polishing precision is PP103 less than or equal to 0.5 μm, and the thickness of the diamond coating is 0.5-18 μm (in the present embodiment, the polishing precision is 0.3 μm, and the thickness of the diamond coating is 3.5 μm). The inner hole coating diversion lower round edge 103 is reinforced by adopting a diamond coating, so that the smoothness and abrasion resistance of the surface are improved, the abrasion and surface defects of the inner hole coating diversion lower round edge in the coating process of the large-flow coating large-core optical fiber are reduced, and the coating quality is improved.
Referring to fig. 1-3, the inner die hole 104 is designed in a vertical plane, the joint transition area between the inner die hole 104 and the round edge 103 of the inner die coating material under the diversion is designed in a round corner, and the diameter of the inner die hole is 200-2000 μm (in this embodiment, the diameter of the inner die hole 104 is 600 μm). The inner die hole 104 surface is polished and diamond plating strengthening is performed with a polishing accuracy of not more than 0.3 μm and a diamond plating thickness of 5 to 50 μm (in this embodiment, a polishing accuracy of 0.2 μm and a diamond plating thickness of 3.5 μm). In this embodiment, the inner die hole 104 plays a role of coating sizing, and the outer diameter of the optical fiber coating is adjusted by setting the aperture size of the inner die hole 104. In this embodiment, the vertical plane design of the inner die hole 104 and the connection transition area between the inner die hole and the lower round edge 103 of the inner hole coating guide flow adopt a round corner design, so that the surface finish polishing and the diamond coating strengthening are performed, the surface shearing force resistance of the inner die hole in the process of wire drawing and coating of the large-core-diameter optical fiber is further enhanced, the coating is prevented from being damaged by pulling at the outlet of the die hole, and the coating quality is improved.
Referring to fig. 1-3, the lower plane 105 of the outlet of the inner die hole is designed in a horizontal plane, and the depth of the lower plane of the outlet of the inner die hole is 0.5-3mm (in this embodiment, the depth of the lower plane 105 of the outlet of the inner die hole is 1 mm). The lower orifice relief step 106 is designed in a vertical plane, and the height of the lower orifice relief step is 1-5mm (in this embodiment, the height of the lower orifice relief step 106 is 3 mm). The lower bottom edge 107 of the mold is designed in a horizontal plane, and the depth of the lower bottom edge 107 is 1-10mm (in this embodiment, the depth of the lower bottom edge 107 is 5 mm). In this embodiment, through the design of the lower opening abdication step 106, the overflow of the coating in the process of demolding of the lower opening of the inner die hole can be reduced, so that the assembly of the die and the die table in the process of long-time wire drawing and coating is stable, and the assembly precision of the die and the concentricity performance of the coating are improved.
Referring to fig. 1-3, the outer circumferential positioning die edge 202 is the outermost layer of the die, and is assembled by matching the outer diameter of the outer circumferential positioning die edge 202 with a mounting hole of a wire drawing coating device (not labeled in the figure), so that the die is mounted in a centering manner, and the inner center multi-layer structure of the die is concentric with the outer circumferential positioning die edge. In this embodiment, the outer circumferential positioning die edge 202 is designed in a vertical plane, and the outer circumferential positioning die edge height is 1-5mm (in this embodiment, the outer circumferential positioning die edge 202 height is 3 mm). The intermediate transition area between the upper inlet die face 101 and the outer circle positioning die edge 202 is an upper inlet outer circle bevel edge transition table 201, the upper inlet outer circle bevel edge transition table 201 adopts a round angle and bevel edge over design mode, the round angle radius of the bevel edge transition table is 0.2-2.0mm, the bevel angle of the upper inlet outer circle bevel edge transition table 201 is 3-15 degrees (in the embodiment, the round angle radius is 0.4mm, and the bevel angle is 6 degrees). The transition area between the upper inlet die surface 101 and the outer circle positioning die edge 202 is the upper inlet outer circle bevel edge transition table 201, so that the edge collision damage of the die in the process of assembling with the die table can be effectively reduced, the influence of the die surface on the die assembly precision is reduced, and the die assembly consistency is improved.
Referring to fig. 1-3, the outer placement stage 204 is designed as a horizontal plane, the mold is placed on the applicator assembly plane (not labeled in the figure) by the outer placement stage 204, the outer placement stage 204 is a horizontal reference plane of the mold, the depth of the outer placement stage is 1-4mm, and the outer placement stage 204 is attached to the applicator assembly plane. In this embodiment, the requirements of the outer placement mesa 204 on the horizontal flatness and the horizontal straightness are high, the horizontal flatness p204 of the outer placement mesa 204 is less than or equal to 0.01mm, the horizontal straightness s204 of the outer placement mesa is less than or equal to 0.1 μm/1000mm (in this embodiment, the depth of the outer placement mesa 204 is 2mm, the horizontal flatness of the outer placement mesa 204 is 0.006mm, and the horizontal straightness is 0.06 μm/1000 mm). The joint area of the outer circle positioning die edge 202 and the outer placement table top 204 is designed by adopting an outer circle outer table top round opening 203, and the round corner radius of the outer circle outer table top round opening 203 is 0.1-2.0mm (in the embodiment, the round corner radius of the outer circle outer table top round opening 203 is 0.7 mm). Through the round mouth design of the joint area of the outer circle positioning die edge 202 and the outer placement table 204, the edge collision damage of the die in the assembly process of the die table can be effectively reduced, the influence of the die edge on the assembly precision of the die is reduced, and the assembly consistency of the die is improved.
Referring to fig. 1-3, the outer circular inner mold edge 205 is designed in a vertical plane, and the outer circular inner mold edge 205 and the outer circular positioning mold edge 202 are parallel and concentric. The depth of the outer cylindrical inner mold edge 205 is 1-15mm (in this embodiment, the depth of the outer cylindrical inner mold edge 205 is 3 mm).
When the invention is used, the drawing parameters of the matched drawn large-core-diameter optical fiber are as follows: the diameter of the quartz glass cladding of the optical fiber is 600+/-2 mu m; the temperature of the hot zone of the wire drawing furnace is 2050 ℃; the length of the hot zone of the wire drawing furnace is 100mm; the wire drawing speed is 18+/-2 m/min; the wiredrawing tension is 46+/-3 g; the thickness of the coating layer was 20.+ -.2. Mu.m. The optical fiber coating parameters of the finally obtained large-core optical fiber are as follows: 20g of paint discharge amount; the coating has no bubbles and no defects; the thickness of the coating is 20+/-1 mu m; the concentricity error of the coating and the cladding is 0.2 mu m; the surface of the coating is smooth; the coating is stripped without residue.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (6)
1. A coating die for drawing of big core diameter optic fibre low-speed low tension, includes mould body, its characterized in that: the die body sequentially comprises an inner part and an outer part from inside to outside;
the inside of the die sequentially comprises an upper inlet die surface (101), an inner hole coating diversion upper round edge (102), an inner hole coating diversion lower round edge (103), an inner die hole (104), an inner die hole outlet lower plane (105), a lower opening abdication step (106) and a lower bottom edge (107) from top to bottom;
the outer part of the die sequentially comprises an upper inlet outer circle bevel edge transition table (201), an outer circle positioning die edge (202), an outer circle outer table top round opening (203), an outer placing table top (204) and an outer circle inner die edge (205) from top to bottom;
the upper circular edge (102) of the inner hole coating diversion adopts a convex arc surface design, the radius of the convex arc is 3-30mm, and the angle of the circular edge is 5-35 degrees;
the inner hole coating diversion lower round edge (103) adopts a concave arc surface design, the radius of the concave arc is 5-80mm, and the angle of the arc edge is 8-60 degrees;
the internal mold hole (104) adopts a vertical plane design, a joint transition area between the internal mold hole (104) and a round edge (103) under the diversion of the inner hole coating adopts a round corner design, and the diameter of the internal mold hole (104) is 200-2000 mu m;
the lower plane (105) of the outlet of the internal mold hole adopts a horizontal plane design, and the depth of the lower plane (105) of the outlet of the internal mold hole is 0.5-3mm; the lower opening abdication step (106) adopts a vertical plane design, and the height of the lower opening abdication step (106) is 1-5mm; the lower bottom edge (107) of the die adopts a horizontal plane design, and the depth of the lower bottom edge (107) is 1-10mm.
2. The coating die for low-speed low-tension drawing of large-core optical fiber according to claim 1, wherein: the upper inlet die surface (101) is designed in a horizontal plane, and the depth of the upper inlet die surface (101) is 1-5mm.
3. The coating die for low-speed low-tension drawing of large-core optical fiber according to claim 1, wherein: the upper inlet outer circle bevel edge transition table (201) adopts a corner rounding and bevel edge over design mode, the corner rounding radius is 0.2-2.0mm, and the bevel edge angle is 3-15 degrees.
4. The coating die for low-speed low-tension drawing of large-core optical fiber according to claim 1, wherein: the outer circle positioning die edge (202) is designed in a vertical plane, the height of the outer circle positioning die edge (202) is 1-5mm, and the inner center multi-layer structure of the die is concentric with the outer circle positioning die edge (202).
5. The coating die for low-speed low-tension drawing of large-core optical fiber according to claim 1, wherein: the round corner radius of the round opening (203) of the outer circular table top is 0.1-2.0mm; the outer placing table top (204) adopts a horizontal plane design, and the depth of the outer placing table top (204) is 1-4mm.
6. The coating die for low-speed low-tension drawing of large-core optical fiber according to claim 1, wherein: the outer circle inner die edge (205) is designed in a vertical plane, the outer circle inner die edge (205) is parallel and concentric with the outer circle positioning die edge (202), and the depth of the outer circle inner die edge is 1-15mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211238815.4A CN115636600B (en) | 2022-10-11 | 2022-10-11 | Coating die for low-speed low-tension drawing of large-core-diameter optical fiber |
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| CN202211238815.4A CN115636600B (en) | 2022-10-11 | 2022-10-11 | Coating die for low-speed low-tension drawing of large-core-diameter optical fiber |
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| CN115636600A CN115636600A (en) | 2023-01-24 |
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| CN110225896A (en) * | 2017-01-24 | 2019-09-10 | 康宁股份有限公司 | Optical fiber coating die head with reduced wet length |
| JP6612964B1 (en) * | 2018-12-27 | 2019-11-27 | 株式会社フジクラ | Optical fiber manufacturing method and optical fiber manufacturing apparatus |
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