JPH0663483A - Resin coating die - Google Patents

Abstract

(57) [Abstract] [Purpose] When manufacturing a multi-core, especially 5-core or more optical fiber tape core wire by batch coating, there is no disorder in the arrangement state of multiple optical fiber element wires, and correct alignment is possible. (EN) A die for resin coating capable of producing an optical fiber ribbon which maintains its state. [Structure] Two or more coat parts 14 and 18 composed of resin reservoir parts 15 and 19 and dice parts 16 and 20 are provided in series, and the opening dimension of the dice part 16 on the entry side of the optical fiber element wires 1 ... It is made smaller than the opening size of the die portion 20 on the line side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin coating die for manufacturing an optical fiber core wire (hereinafter referred to as a tape core wire).

[0002]

2. Description of the Related Art In a method for manufacturing a tape core wire, a plurality of pre-manufactured optical fiber wires (hereinafter referred to as "wires") are arranged in an aligned state and supplied to a resin coating die. There is a method in which a resin liquid such as an ultraviolet curable resin is applied in a die, and is collectively covered in a tape shape to cure the resin liquid.

By the way, in order to increase the capacity of the optical cable, it is required to increase the number of cores in the tape cores, and the development of 8-cores to 20-cores tape cores is in progress.

However, in the case of a multi-core tape core wire having a number of core wires of 8 or more, when a plurality of element wires are collectively covered in an aligned state as described above, it is important to properly maintain the aligned state and collectively cover the core wires. As the number increases, it becomes difficult, and the strand arrangement disorder as shown in FIGS. 4 and 5 easily occurs. In the figure, reference numeral 1 is an element wire, and 2 is a covering material.

If there is such a disorder in the arrangement of the wires in the tape core wire, a problem may occur during the collective fusion splicing and the collective connector connection of the tape core wires, and the tape core wires as shown in FIG. If there is a disorder in the thickness direction, the coating material 2 may not be removed uniformly, and the strands 1 may be cut.

[0006]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to manufacture a tape core wire in which the array state of the strands is not disturbed and the correct alignment state is maintained even in the manufacture of the multi-core tape core wire. The purpose is to obtain a resin coating die.

[0007]

The object of the present invention is to provide two or more coat portions formed of a resin reservoir portion and a die portion in series, and select one of the two or more coat portions for the die portion on the wire entry side. This is solved by making the opening size smaller than the opening size of the die portion on the outgoing line side.

The present invention will be described in detail below. Figure 1
An example of the resin coating die of the present invention (hereinafter, simply referred to as a die) is shown. The die has a half-split structure, reference numeral 11 indicates a base portion, and 12 indicates an upper portion.
By stacking the upper portion 12 on the upper portion 1 as indicated by an arrow in the figure, a die having a rectangular parallelepiped outer shape is configured. One end of the nipple portion 13 is opened on the front surface of this die, that is, on the side surface into which the plurality of strands 1 ... Are inserted.

The nipple portion 13 is a hollow cavity having a rectangular cross section for guiding a plurality of strands into the die in an aligned state.
Its width is slightly larger than the product of the number of wires and the wire diameter,
Its height is slightly larger than the wire diameter. The other end of the nipple portion 13 communicates with the first coat portion 14.

The first coat section 14 is composed of a first resin reservoir section 15 and a first die section 16. The first resin reservoir 15 stores a resin liquid such as an ultraviolet curable resin that serves as a coating material for the tape core wire, and contacts the resin liquid with the wires running there to apply the resin liquid. It is a space having a relatively large volume. A resin supply hole 17 is formed in an upper portion of the first resin reservoir liquid 15, and a pressure supply pipe from a resin liquid pressure supply device (not shown) is connected to the resin supply hole 17 so that the resin liquid amount is 0.5 to 2 kg.
It is supplied to the first resin reservoir 15 at a pressure of / cm ² .

The first die portion 16 defines the application amount and application position of the resin liquid applied on the surface of the wire, and has a rectangular cross section.

A second coat portion 18 is provided next to the first coat portion 14 so as to be continuous therewith. The second coat portion 18 is composed of a second resin reservoir portion 19 and a second die portion 20 similarly to the first coat portion 14, and a resin supply hole 21 is similarly provided above the second resin reservoir portion 19. Formed,
It has the same structure as the first resin reservoir 15. The second die part 20 also has a similar cross-sectional shape of a rectangle.
The opening size is slightly larger than the die portion 16. The rear end portion of the second die portion 20 is opened on the rear surface of the die, and the element wire group 1 collectively covered with the resin liquid is led out from here.

Then, in these two first and second coat portions 14 and 18, the opening size of the first die portion 16 shown in FIG. 2, that is, the width W ¹ and D ¹ is the same as that of the second die shown in FIG. The width W ² and the height D ^{2 of the} portion 20 are respectively smaller than or equal to each other. Further, the opening size of the first die portion 16 satisfies the following formulas (I) and (II), where d is the strand diameter and n is the strand diameter in the range of 150 to 400 μm. Stipulated in.

0 μm <D ¹ −d ≦ 50 μm (I)

0 μm <W ¹ −d · n ≦ 200 μm (II)

In order to manufacture a tape core wire by using the die having such a structure, a predetermined number of strands 1 ... Are arranged in an aligned state and fed into the inside from the nipple portion 13 on the front surface of the die to form the first coat. The coating is run from the portion 14 toward the second coating portion 18, and the resin liquid is applied to the coating portions 14 and 18 to coat the strands 1 ...

At this time, in such a die, the opening size of the first die portion 16 of the first coat portion 14 is determined so as to satisfy the above equations (I) and (II). As shown in FIG. 2, the clearance between the inner wall surface of the first die portion 16 and the strands is small, and the plurality of strands 1 ... Are kept in the correct alignment state, and the resin liquid is applied thinly. That is, the arrangement of the strands 1 ... Is controlled in the first die 16 section.

The strands 1 ... Maintained in this aligned state and lightly coated with the resin liquid are sent to the second coat section 18, but the opening size of the second die section 20 is the first die section 16 Therefore, the resin liquid is further applied onto the resin liquid covered with the first die portion 16 without disturbing the aligned state, and the width and the thickness as the tape core wire are determined here. That is, in the second die portion 20, the width, thickness and shape of the finished tape core wire are controlled.

In this way, according to this die, a multi-core tape core wire, particularly a tape core wire of 8 cores or more having a large number of core wires can be manufactured in a correct alignment state without disturbing the arrangement state of the wire strands. You can It should be noted that in the above example, the coat portion is 2
However, three or more may be provided in series. In this case, the opening size of the die part may be gradually increased from the incoming line side to the outgoing line side.

[0020]

As described above, in the die of the present invention, in the coat portion having the die portion, the opening size of the die part on the wire entry side is smaller than the opening size of the die part on the output side. Therefore, it is possible to manufacture a multi-core tape core wire in a state in which the array state of each element wire is properly arranged.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an example of a die of the present invention with a partial cross section.

FIG. 2 is a cross-sectional view showing an open state of a first die portion of the die of the present invention.

FIG. 3 is a cross-sectional view showing an open state of a second die portion of the die of the present invention.

FIG. 4 is a cross-sectional view showing an example of a tape core wire manufactured by a conventional die.

FIG. 5 is a sectional view showing another example of a tape core wire manufactured by a conventional die.

[Explanation of symbols]

1 ... strand, 14 ... first coat part, 16 ... first die part,
18 ... 2nd coat part, 20 ... 2nd dice part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Suehiro Miyamoto 1440 Rokuzaki, Sakura City, Chiba Prefecture Fujikura Electric Wire Co., Ltd. Sakura Factory

Claims (3)

[Claims] 1. A curable resin liquid having a nipple portion, a coating portion composed of a resin reservoir portion and a die portion, a plurality of optical fiber strands being inserted from the nipple portion in an aligned state, and a resin reservoir portion. In a resin coating die for producing an optical fiber tape core wire, which is coated with and is collectively coated in a tape form at a die portion, two or more coat portions are provided in series, and among these two or more coat portions, A resin coating die, characterized in that an opening size of a die part on an input side of an optical fiber element wire is smaller than an opening size of a die part on an output side. 2. When the width of the opening of the first die portion from the entry side is W, the height is D, the diameter of the optical fiber strand is d, and the number of strands is n, the following formula (I) is obtained. And 0 μm <D−d ≦ 50 μm (I) 0 μm <W−d · n ≦ 200 μm (II) (II) Formula, The resin coating die according to claim 1. 3. A method for manufacturing an optical fiber ribbon, which comprises manufacturing an optical fiber ribbon using the resin coating die according to claim 1.