JP2019133033A - Coating device for optical fiber ribbon, and method for manufacturing optical fiber ribbon - Google Patents

Abstract

To suppress, by a simple structure, the occurrence of a swirl of high temperature resin circuiting near the middle portion of a die nozzle and eliminate temperature unevenness in the longitudinal nozzle direction of a resin supplied to a die nozzle, and thereby prevent the thickness of a resin in the middle portion of an optical fiber ribbon from becoming thick.SOLUTION: A coating device 200 comprises: a die 10 in the middle portion of which is formed a nozzle 11 which a plurality of optical fiber ribbons arrayed along one plane pass through; a nipple 20 having an underside 23 that forms a resin reservoir, to which a coating resin is supplied, between the top face of the die 10 and itself, with an insertion hole 22 formed at the middle portion of the underside 23; and a die holder for holding the die 10 and the nipple 20, with a space therebetween, so that the nozzle 11 and the insertion hole 22 form a coaxial state. The opening periphery of the nozzle 11 on the top face 15 side of the die 10 is provided with, for example, a concavity, and a wall higher than the opening face of the nozzle 11 is formed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a coating apparatus for an optical fiber ribbon and a method for manufacturing the optical fiber ribbon.

  The optical fiber ribbon is formed by arranging a plurality of optical fibers along a single plane, applying an ultraviolet curable resin or the like to them and curing the resin. For example, as disclosed in Patent Documents 1 and 2, as a resin coating device for an optical fiber ribbon, a coating device in which a taper of a nozzle formed on a die or a gap between a die and a nipple is devised is known. ing.

  Further, in order to pull down the optical fiber to a subscriber's house or the like, it is necessary to separate (intermediate branch) from a multi-core optical fiber ribbon to a single-core optical fiber. In order to easily perform this, it is known to use an intermittent tape core wire in which adjacent optical fiber core wires are alternately bonded so that the optical fiber tape core wires can be easily separated from each other. Such intermittent tape cores are manufactured by, for example, manufacturing an optical fiber tape core integrated by a common coating layer and making intermittent cuts in the longitudinal direction in the common coating layer between adjacent optical fiber cores. can get.

Japanese Patent Laid-Open No. 10-227955 JP 2000-338377 A

  By the way, when manufacturing an optical fiber ribbon using a conventional coating apparatus, the tape thickness is reduced at the center of the optical fiber ribbon as the manufacturing speed, that is, the drawing speed of the optical fiber is increased. Thickness and uneven thickness are observed.

  FIG. 9 is a view for explaining the flow of resin in a conventional resin coating device for an optical fiber ribbon, and shows a cross-section of the main part viewed from the arrangement direction of the optical fiber ribbon. . The coating apparatus includes a die 10 ′ in which a nozzle 11 ′ having an oblong cross-sectional shape in which a plurality of optical fiber cores 2 pass and a short side of the rectangular shape formed in an arc shape is formed in the center, and an optical fiber A nipple 20 ′ having a fiber insertion hole 22 ′ having an oblong cross section formed in a circular arc shape with a rectangular cross section through which the core wire 2 passes or a short side of the rectangle formed in an arc shape, and a top surface of the die 10 ′. A resin reservoir 70 'is formed between 15' and the lower surface 23 'of the nipple 20'. The nozzle 11 ′ of the die 10 ′ has a taper 12 ′ in which the insertion port side of the optical fiber core wire 2 extends toward the upper surface. The optical fiber strands are arranged in a direction perpendicular to the paper surface of FIG.

  The cause of the uneven thickness in which the resin thickness of the optical fiber ribbon manufactured by such a manufacturing apparatus is uneven was analyzed. As a result, at the taper 12 ′ of the nozzle 11 ′ of the die 10 ′ when the optical fiber ribbon is formed, the resin generates shear heat, the resin flow as indicated by the arrow A occurs, and the heat generated resin partially flows back, Heat is returned to the resin reservoir 70 ′ between the die 10 ′ and the nipple 20 ′, and the resin with this heat circulates near the center, so the temperature at the center of the optical fiber ribbon is increased. I found out. The temperature of the resin reservoir 70 'can be lowered by mixing with new resin indicated by the arrow B sent from the supply system around the nozzle 11', but the overall temperature is lowered as indicated by the arrow C at the center of the tape. A vortex through which high temperature resin circulates occurs and does not mix with the surrounding resin, and the temperature remains high. When the temperature of the resin is high, the viscosity of the resin decreases, and therefore, it is considered that only the central portion of the tape becomes thick as a result of an increase in the flow rate of the resin. This phenomenon becomes more prominent as the linear velocity of the optical fiber 2 is increased.

  FIG. 10 is a cross-sectional view showing an example of an optical fiber ribbon manufactured by using the manufacturing apparatus shown in FIG. In the optical fiber ribbon 1, six optical fibers 2 are arranged in parallel, and are integrated by a common coating layer 3 made of resin. Each optical fiber core wire 2 is provided with, for example, two resin coating layers around a glass fiber composed of a core and a clad. The thickness of the common coating layer 3 between the optical fiber cores 2 is larger at the center than at the end in the width direction (d3> d2> d1). When making an intermittent tape core wire by making a cut at a predetermined portion between the optical fiber core wires 2 of such an optical fiber tape core wire 1, a cut is easily made at a portion where the thickness of the common coating layer 3 is thin. However, there is a problem that it is difficult to make a stable cut at a thick portion of the common coating layer 3. Note that the uneven thickness of the coating resin occurs because the resin supplied to the die nozzle has temperature unevenness in the nozzle longitudinal direction, and if the resin temperature is uniform in the nozzle longitudinal direction, the temperature is somewhat There is no problem even if it goes up.

  The present invention has been made in view of these circumstances, and with a simple structure, the resin supplied to the die nozzle is suppressed by suppressing the circulation of the resin having a high temperature formed in the resin reservoir at the center of the die nozzle. An object of the present invention is to prevent the resin thickness at the center of the optical fiber ribbon from becoming thicker by eliminating the temperature unevenness in the nozzle longitudinal direction.

  In the coating device for an optical fiber ribbon according to one aspect of the present invention, a nozzle through which a plurality of optical fiber cores arranged along one plane passes is formed in a central portion, and the optical fiber core of the nozzle The insertion hole of the wire has a die having a tapered shape, and a lower surface forming a resin reservoir to which a coating resin is supplied between the upper surface of the die and an insertion hole through which the optical fiber core wire passes in the center portion A coating device for an optical fiber ribbon comprising: a nipple formed on a die holder; and a die holder that holds the die and the nipple with a gap so that the nozzle and the insertion hole are coaxial. A wall higher than the opening surface of the nozzle is provided around the opening of the nozzle on the upper surface side of the die.

  In addition, a method for manufacturing an optical fiber ribbon according to one aspect of the present invention is a method for manufacturing an optical fiber ribbon in which a plurality of optical fibers arranged along one plane are collectively coated with a resin. Thus, the above-described coating device for an optical fiber ribbon is used.

  According to the present invention, the wall provided around the nozzle of the die obstructs the generation of vortices caused by the resin reservoir, so that the generation of vortices that circulate high temperature resin near the center of the nozzle can be suppressed. Can do. For this reason, temperature unevenness in the nozzle longitudinal direction of the resin supplied to the nozzle of the die is eliminated, and it is possible to prevent the resin thickness at the center of the optical fiber ribbon from becoming thick. Moreover, even if the manufacturing speed is increased, there is no problem that the thickness of the resin is biased.

It is a figure for demonstrating the manufacturing method of the optical fiber ribbon based on one Embodiment of this invention. It is sectional drawing of the coating apparatus for optical fiber ribbons concerning the 1st Embodiment of this invention, and is the figure seen from the sequence direction of an optical fiber ribbon. It is a figure which shows the die | dye of the coating apparatus for optical fiber tape cable cores concerning the 1st Embodiment of this invention. It is a figure for demonstrating the flow of the resin in the coating device for optical fiber tape cable cores concerning the 1st Embodiment of this invention. It is a figure which shows the die | dye of the coating apparatus for optical fiber tape cable cores concerning the 2nd Embodiment of this invention. It is a figure which shows the die | dye of the coating apparatus for optical fiber tape cable cores concerning the 3rd Embodiment of this invention. It is a figure which shows the die | dye of the coating apparatus for optical fiber tape cable cores concerning the 4th Embodiment of this invention. It is a figure which shows the die | dye of the coating apparatus for optical fiber ribbons which concerns on the 5th Embodiment of this invention. It is a figure for demonstrating the flow of the resin in the conventional coating device for optical fiber tape core wires. It is a figure which shows an example of the optical fiber tape core wire manufactured using the coating apparatus for optical fiber tape core wires shown in FIG.

(Description of the embodiment of the present invention)
First, embodiments of the present invention will be listed and described.
In the coating device for an optical fiber ribbon according to one aspect (1) of the present invention, a nozzle through which a plurality of optical fiber cores arranged along one plane passes is formed in a central portion, and the nozzle Insertion hole through which the optical fiber core wire has a die having a tapered insertion port side of the optical fiber core wire and a lower surface forming a resin reservoir to which a coating resin is supplied between the upper surface of the die Is a coating apparatus for an optical fiber ribbon comprising: a nipple formed in a central portion; and a die holder that holds the die and the nipple spaced apart so that the nozzle and the insertion hole are coaxial. In addition, a wall higher than the opening surface of the nozzle is provided around the opening of the nozzle on the upper surface side of the die.
According to this aspect, the wall provided around the nozzle of the die prevents the generation of vortices generated by the resin reservoir, so that the generation of vortices circulating high temperature resin near the center of the nozzle can be suppressed. Can do. For this reason, temperature unevenness in the nozzle longitudinal direction of the resin supplied to the nozzle of the die is eliminated, and it is possible to prevent the resin thickness at the center of the optical fiber ribbon from becoming thick. Moreover, even if the manufacturing speed is increased, there is no problem that the thickness of the resin is biased.

As one aspect (2) of the present invention, in the above-described coating device for an optical fiber ribbon, it is preferable that the wall is disposed on both sides of the nozzle along at least the longitudinal direction of the nozzle.
According to this aspect, it is possible to reliably suppress the occurrence of uneven thickness due to the temperature rising only in the central portion of the tape.

As one aspect (3) of the present invention, in the coating apparatus for an optical fiber ribbon, the wall is formed from a recess surrounding the periphery of the opening of the nozzle.
As one aspect (4) of the present invention, in the coating device for an optical fiber ribbon, the hollow has an elliptical shape with the longitudinal direction of the nozzle as the major axis.
As one aspect (5) of the present invention, in the coating device for an optical fiber ribbon, the recess has a circular shape formed around the center of the nozzle.
As one aspect (6) of the present invention, in the coating apparatus for an optical fiber ribbon, the recess has a square shape formed around the nozzle.
According to these aspects, a wall higher than the opening surface of the nozzle can be formed around the opening of the nozzle on the upper surface side of the die by simple processing.

As one aspect (7) of the present invention, in the above-described coating device for an optical fiber ribbon, the wall is formed of a convex portion provided in parallel with the longitudinal direction of the nozzle.
As one aspect (8) of the present invention, in the above-described coating device for an optical fiber ribbon, the convex portion is divided in the vicinity of the central portion of the nozzle.
As one aspect (9) of the present invention, in the above-described coating device for an optical fiber ribbon, the wall is formed by a convex portion that surrounds the periphery of the opening of the nozzle.
According to these aspects, one form of the wall provided on the upper surface side of the die can be provided. Further, by dividing the convex portion in the vicinity of the central portion of the nozzle or surrounding the nozzle, temperature unevenness in the longitudinal direction of the resin supplied to the nozzle of the die can be further suppressed.

As one aspect (10) of the present invention, in the coating apparatus for an optical fiber ribbon, the height of the wall is ¼ to ½ of a distance between the upper surface of the die and the lower surface of the nipple. It is desirable to have a length.
According to this aspect, the height of the wall provided around the nozzle can be set to an optimum value with respect to the axial height of the resin reservoir.

The manufacturing method of the optical fiber ribbon according to the aspect (11) of the present invention is a manufacturing method of an optical fiber ribbon in which a plurality of optical fibers arranged along one plane are collectively coated with a resin. Thus, the above-described coating device for the optical fiber ribbon is used.
According to this aspect, it is possible to prevent an increase in the thickness of the resin in the central portion of the tape by increasing the temperature only in the central portion of the tape, and the manufacturing speed can be increased.

(Details of the embodiment of the present invention)
Specific examples of the coating device for an optical fiber ribbon and the method for manufacturing the optical fiber ribbon according to the embodiment of the present invention will be described below with reference to the drawings. In addition, this invention is not limited to the following illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to the claim are included. Moreover, as long as the combination is possible about several embodiment, this invention includes what combined arbitrary embodiment. In the following description, the same reference numerals in different drawings are the same, and the description thereof may be omitted.

(First embodiment)
FIG. 1 is a diagram for explaining a method of manufacturing an optical fiber ribbon according to an embodiment of the present invention.
The optical fiber ribbon manufacturing apparatus includes a supply device 100. In the supply device 100, n (for example, 6) reels 101 to 106 corresponding to the number of optical fibers of the optical fiber tape 1 are provided. n dancer rollers 111 to 116 and a guide roller 120 are provided. An optical fiber core wire 2 is wound around each of the reels 101 to 106. The optical fiber core 2 has an outer diameter of 240 to 250 μm, and is provided with, for example, two resin coating layers around a glass fiber having a standard outer diameter of 125 μm made of a core and a clad as shown in FIG. is there. The optical fiber cores 2 fed out from the reels 101 to 106 are each given a tension of about several tens of gf by the dancer rollers 111 to 116, and are arranged on one arrangement surface when passing through the guide rollers 120. The optical fiber core 2 is further concentrated by a guide roller 130 immediately above and sent to the coating apparatus 200.

  The optical fiber core wire 2 is inserted into such a coating apparatus 200 and pulled with a predetermined tension at the subsequent stage. Thereby, the inserted optical fiber core wire 2 is guided by the nipple in the coating apparatus 200 to be in a desired arrangement, and is sent to the die. It is applied around the line 2. The ultraviolet curable resin is supplied from a pressure type resin tank 210. Then, the six optical fiber core wires 2 coated with the ultraviolet curable resin are cured by being irradiated with ultraviolet rays in the ultraviolet irradiation device 220. The cured ultraviolet curable resin becomes a common coating layer, and the 6-fiber optical fiber ribbon 1 is formed.

  The optical fiber ribbon 1 cured by being irradiated with ultraviolet rays by the ultraviolet irradiation device 220 has a guide roller 230, a delivery capstan 310, a take-up tension control dancer roller 320, and a reel through an intermittent processing device 400. It is sent to the winding device 330. For example, the intermittent processing apparatus 400 uses a cutting roller (not shown) to form an intermittent connection portion of the optical fiber ribbon 1 so that the common coating layer 3 between the predetermined optical fibers 2 of the optical fiber ribbon 1 is formed. Are periodically cut in the thickness direction. In the winding device 330, the optical fiber ribbon 1 that has become an intermittent ribbon is wound around a reel through a guide. The winding tension of the entire optical fiber ribbon at this time is set to several tens gf to several hundreds gf, for example.

  In this way, the optical fiber ribbon is manufactured, and the coating apparatus 200 coats a thermoplastic resin, not an ultraviolet curable resin, as a taped resin for forming the common coating layer 3. Also good. In this case, the coating apparatus 200 includes an extruder that extrudes a thermoplastic resin and a cooling device that cools the extruded resin. In any case, it is effective to cure the resin as soon as possible after passing through the die 10 in order to maintain the shape of the optical fiber ribbon 1.

  Next, the coating apparatus 200 will be described. FIG. 2 is a cross-sectional view of the coating device for an optical fiber ribbon according to the first embodiment of the present invention, as viewed from the arrangement direction of the optical fiber ribbon. FIG. 3 is a view showing a die of this coating apparatus, FIG. 3 (A) is a perspective view of the die as viewed obliquely from above, and FIG. 3 (B) is an XX arrow shown in FIG. 3 (A). FIG. 3C is a cross-sectional view, and FIG. 3C is a view of the die as viewed from above, and FIG. 3D is a view of the die as viewed from below. In the present specification, the upstream side in the transport direction of the optical fiber core is the upper side, and the downstream side is the lower side.

  As shown in FIG. 2, the coating apparatus 200 has an outer sleeve 40 and an inner sleeve 30 coaxially inside a holder 50, and a die 10 and a nipple (also referred to as a point) inside the inner sleeve 30. ) 20. The holder 50 has, for example, a cup shape, and a resin passage 51 penetrating in the radial direction is provided at an appropriate position on the side surface of the holder 50. Also, the outer sleeve 40 is provided with a resin passage 41 communicating with the resin passage 51 provided in the holder 50, and the resin passage 41 is a space formed by the inner sleeve 30 and the outer sleeve 40. The resin reservoir 32 is communicated. In addition, although the die holder holding the die | dye of this invention is comprised from the holder 50, the outer sleeve 40, and the inner sleeve 30, it is not limited to this.

  Upper portions of the inner sleeve 30, the outer sleeve 40, and the holder 50 are covered with a lid 60, and an opening 61 is provided at the center of the lid 60. The upper opening 21 formed in the center of the nipple 20 is exposed from the opening 61. The plurality of optical fiber core wires 2 enter the coating apparatus 200 from the upper opening 21 of the nipple 20. In addition, a bottom opening 42 and a bottom opening 52 are formed at the center positions of the bottoms of the outer sleeve 40 and the holder 50, respectively. And out of the coating apparatus 200.

  The inner sleeve 30 is provided with a resin passage 31 penetrating in a radial direction at an appropriate position of the resin storage portion 32, and the resin passage 31 is formed on the inner peripheral surface of the inner sleeve 30 and the outer peripheral surface of the nipple 20. The resin passage 71 communicates with the resin passage 71. The die 10 is disposed below the nipple 20 at a predetermined interval, and a lower inner peripheral surface of the inner sleeve 30, a lower surface 23 of the nipple 20, and a space surrounded by the upper surface of the die 10 form a resin reservoir 70. doing. The resin supplied from the resin tank 210 shown in FIG. 1 is the resin passage 51 of the holder 50, the resin passage 41 of the outer sleeve 40, the resin reservoir 32, the resin passage 31 of the inner sleeve 30, and the outer peripheral surface of the nipple 20. The resin is supplied to the resin reservoir 70 from the circumferential direction through the resin passage 71. The resin reservoir 70 can store the supplied resin.

  The nipple 20 is located on the lid 60 side and is fitted to the inner peripheral surface of the inner sleeve 30. A fiber insertion hole 22 through which the optical fiber core wire 2 passes is formed at the lower center position of the nipple 20. The fiber insertion hole 22 is, for example, an oval having a rectangular short side formed into an arc shape or a rectangle, and the inner surface is mirror-finished. The plurality of optical fiber cores 2 are guided by the fiber insertion holes 22 and arranged in a single plane at a desired pitch. The fiber insertion hole 22 opens into the resin reservoir 70.

  The die 10 is positioned below the nipple 20 and is fitted to the inner peripheral surface of the inner sleeve 30. At the center position of the die 10, a nozzle 11 is formed through which the optical fiber core wire 2 exiting from the nipple 20 passes. The nozzle 11 is coaxial with the fiber insertion hole 22 of the nipple 20 and extends along the vertical direction, and penetrates the die 10. The nozzle 11 is open to the resin reservoir 70, and the plurality of optical fiber cores 2 arranged along one plane pass through the nozzle 11 in a state where resin is applied to the periphery.

  Next, the die used for the coating apparatus of this embodiment will be described. As shown in FIG. 3, the die 10 has a substantially cylindrical shape, and a nozzle 11 through which the optical fiber core wire 2 passes is formed at the center. This nozzle 11 has an oval or rectangular shape in which the cross section on the insertion port side of the optical fiber core wire 2, that is, the resin reservoir 70 side is, for example, a rectangular short side formed into an arc shape, and the inner surface has a taper 12. Is formed. The cross section on the discharge port side of the optical fiber core wire 2 of the nozzle 11, that is, the outlet side, has a predetermined shape corresponding to the arrangement shape of the optical fiber core wires 12. A wall 14 higher than the opening surface 16 of the nozzle 11 is provided in the peripheral portion of the nozzle 11 between the nozzle 11 of the die 10 and the inner sleeve 30.

  In this embodiment, the wall 14 is formed of a recess 13 surrounding the periphery of the nozzle opening of the nozzle 11, and the recess 13 has an elliptical shape having the major axis in the longitudinal direction of the oval or rectangle of the nozzle 11. doing.

  Next, the flow of resin in the coating apparatus of this embodiment will be described. FIG. 4 is a view for explaining the flow of resin in the coating device for the optical fiber ribbon of this embodiment, and shows a cross-section of the main part viewed from the arrangement direction of the optical fiber ribbon. . At the taper 12 of the nozzle 11 of the die 10 at the time of forming the optical fiber ribbon, the resin generates shear heat and a resin flow as indicated by an arrow A occurs, and the resin whose temperature has risen partially flows back into the resin reservoir 70. However, in the die 10 of the present embodiment, the wall 14 is formed around the opening of the nozzle 11, so that the vortex in which the resin having a high temperature indicated by the arrow C circulates in the central portion of the optical fiber ribbon. Occurrence can be suppressed. For this reason, it is possible to prevent the resin supplied to the die nozzle from being uneven in temperature in the longitudinal direction of the nozzle, and to prevent the resin from becoming thick at the center of the optical fiber ribbon.

  Here, the height h of the wall 14, in this embodiment, the height h from the opening surface 16 of the nozzle 11 to the upper surface 15 of the die 10 is the distance d between the upper surface 15 of the die 10 and the lower surface 23 of the nipple, that is, It is preferable to have a length that is ¼ to ½ of the interval d of the resin reservoir 70 in order to prevent the occurrence of resin temperature unevenness. Further, the height of the wall 14 is the same in other embodiments described later.

  As described above, in the present embodiment, as shown in FIG. 3, the wall 14 is formed from the elliptical recess 13 surrounding the periphery of the opening of the nozzle 11, but the recess is formed around the center of the nozzle 11. It may be circular.

(Second Embodiment)
FIG. 5 is a diagram showing a die of a coating device for an optical fiber ribbon according to a second embodiment of the present invention. In the present embodiment, a rectangular recess 13 is provided so as to surround the opening of the nozzle 11 provided at the center of the substantially cylindrical die 10. Thus, a wall 14 higher than the opening surface 16 of the nozzle 11 is formed in the peripheral portion of the nozzle 11 between the nozzle 11 of the die 10 and the inner sleeve 30. The wall 14 of the present embodiment has the same function as that of the wall 14 described in the first embodiment, and suppresses the generation of vortices in which a resin having a high temperature circulates in the center portion of the optical fiber ribbon. Can do. For this reason, it is possible to prevent the resin supplied to the die nozzle from being uneven in temperature in the longitudinal direction of the nozzle, and to prevent the resin from becoming thick at the center of the optical fiber ribbon. In order to prevent the resin from staying at the square corners, the corners may be rounded.

(Third embodiment)
FIG. 6 is a view showing a die of a coating device for an optical fiber ribbon according to a third embodiment of the present invention. In the present embodiment, an oval or rectangular nozzle 11 whose cross section is formed in an arc shape on a short side of a rectangle, for example, is provided at the center of the substantially cylindrical die 10 and is parallel to the longitudinal direction of the nozzle 11. On both sides, convex portions 17 projecting from the upper surface of the die are provided. A wall 14 higher than the upper surface 15 that becomes the opening surface of the nozzle 11 is formed by the convex portion 17.

  The wall 14 of the present embodiment does not surround the entire periphery of the nozzle 11 as in the first embodiment, but the vortex of the resin having a high temperature circulating in the central portion of the optical fiber ribbon. It acts as a baffle plate to suppress the occurrence. For this reason, it is possible to prevent the resin supplied to the die nozzle from being uneven in temperature in the longitudinal direction of the nozzle, and to prevent the resin from becoming thick at the center of the optical fiber ribbon. Also in the present embodiment, the height of the wall 14 is set to 1 mm or more, and the distance between the upper surface 15 of the die 10 and the lower surface 23 of the nipple, that is, the length of 1/4 to 1/2 of the distance between the resin reservoirs 70 is set. It is desirable.

(Fourth embodiment)
FIG. 7: is a figure which shows the die | dye of the coating device for optical fiber tape cable cores concerning the 4th Embodiment of this invention. In the present embodiment, an oval or rectangular nozzle 11 whose cross section is formed in an arc shape on a short side of a rectangle, for example, is provided at the center of the substantially cylindrical die 10 and is parallel to the longitudinal direction of the nozzle 11. Divided convex portions 17a and 17b projecting from the upper surface of the die are provided on both sides. A wall 14 higher than the upper surface 15 serving as an opening surface of the nozzle 11 is formed by the convex portions 17a and 17b.

  In the third embodiment, the convex portions 17 are formed on both sides of the entire length of the nozzle 11 in the longitudinal direction. However, if the convex portions 17 are present over the entire length in this way, the nozzle 11 is supplied to the central portion. The temperature of the resin to be applied may be suppressed lower than the end portion. In this embodiment, since the convex portions 17a and 17b are divided in the vicinity of the central portion of the nozzle, the temperature of the resin supplied to the nozzle of the die can be made more uniform.

(Fifth embodiment)
FIG. 8: is a figure which shows the die | dye of the coating device for optical fiber tape cable cores concerning the 5th Embodiment of this invention. In this embodiment, an oval or rectangular nozzle 11 whose cross section is formed in a circular arc shape, for example, a rectangular short side is provided at the central portion of the substantially cylindrical die 10, and is convex around the periphery of the opening of the nozzle 11. A portion 18 is provided. The convex portion 18 forms a wall 14 higher than the upper surface 15 serving as the opening surface of the nozzle 11. The wall 14 of the present embodiment has the same function as that of the wall 14 described in the first embodiment, and suppresses the generation of vortices in which a resin having a high temperature circulates in the center portion of the optical fiber ribbon. Can do. For this reason, it is possible to prevent the resin supplied to the die nozzle from being uneven in temperature in the longitudinal direction of the nozzle, and to prevent the resin from becoming thick at the center of the optical fiber ribbon. In order to prevent the resin from staying at the square corners, the corners may be rounded.

  As described above, if the walls 14 are arranged at least on both sides of the nozzle 11 along the longitudinal direction of the nozzle 11, the temperature of the resin supplied to the central portion of the nozzle 11 is prevented from becoming high. The shape can be changed in various ways.

DESCRIPTION OF SYMBOLS 1 ... Optical fiber ribbon, 2 ... Optical fiber core, 3 ... Common coating layer, 10, 10 '... Die, 11, 11' ... Nozzle, 12, 12 '... Taper, 13 ... Depression, 14 ... Wall, 15, 15 '... upper surface, 16 ... opening surface, 17, 17a, 17b, 18 ... convex portion, 20, 20' ... nipple, 21 ... upper opening, 22, 22 '... insertion hole, 23, 23' ... lower surface 30 ... Inner sleeve 31, 41, 51, 71 ... Resin passageway, 32 ... Resin reservoir, 40 ... Outer sleeve, 42, 52 ... Bottom opening, 50 ... Holder, 60 ... Lid, 61 ... Opening, 70, 70 '... Resin reservoir, 100 ... Supply device, 101-106 ... Reel, 111-116 ... Dancer roller, 120, 230 ... Guide roller, 130 ... Direct guide roller, 200 ... Coating device, 210 ... Resin tank, 220 ... UV irradiation device , 310 ... feed-out capstan, 320 ... winding tension control dancer roller, 330 ... winding device, 400 ... intermittent processing device.

Claims (11)

A nozzle through which a plurality of optical fiber cores arranged along one plane passes is formed in the center, and a die on which the insertion port side of the optical fiber core of the nozzle is tapered,
A nipple having a lower surface forming a resin reservoir to which a coating resin is supplied between the upper surface of the die and an insertion hole through which the optical fiber core wire passes;
A coating device for an optical fiber ribbon comprising a die holder that holds the die and the nipple with a gap so that the nozzle and the insertion hole are coaxial,
A coating apparatus for an optical fiber ribbon, wherein a wall higher than the opening surface of the nozzle is provided around the opening of the nozzle on the upper surface side of the die.   2. The coating device for an optical fiber ribbon according to claim 1, wherein the walls are disposed on both sides of the nozzle along at least the longitudinal direction of the nozzle.   The coating device for an optical fiber ribbon according to claim 1 or 2, wherein the wall is formed of a recess surrounding the periphery of the opening of the nozzle.   The coating device for an optical fiber ribbon according to claim 3, wherein the recess has an elliptical shape with the longitudinal direction of the nozzle as a major axis.   The coating device for an optical fiber ribbon according to claim 3, wherein the recess has a circular shape formed around the center of the nozzle.   The coating device for an optical fiber ribbon according to claim 3, wherein the recess has a square shape formed around the nozzle.   The coating device for an optical fiber ribbon according to claim 1 or 2, wherein the wall is formed of a convex portion provided in parallel with the longitudinal direction of the nozzle.   The coating device for an optical fiber ribbon according to claim 7, wherein the convex portion is divided in the vicinity of a central portion of the nozzle.   The coating device for an optical fiber ribbon according to claim 1 or 2, wherein the wall is formed of a convex portion that surrounds the periphery of the opening of the nozzle.   The optical fiber ribbon according to any one of claims 1 to 9, wherein the height of the wall has a length that is ¼ to ½ of a distance between the upper surface of the die and the lower surface of the nipple. Coating equipment.   11. A method of manufacturing an optical fiber tape core in which a plurality of optical fiber cores arranged along one plane are collectively covered with a resin, wherein the optical fiber tape core according to claim 1. An optical fiber ribbon manufacturing method using a wire coating apparatus.

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