JP2014097879A - Optical fiber winding method, optical fiber wound around bobbin and optical fiber transportation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber winding method that can reduce the transmission loss of an optical fiber and also prevent the winding collapse of an optical fiber.SOLUTION: An optical fiber 10 is wound around a bobbin 11 so that, if a winding tensile force is set as T(N) and a traverse pitch is set as P(mm) when the optical fiber 10 with an external diameter of about 250 μm is wound around the bobbin 11, T/Pis 0.5 N/mmor more and 6.3 N/mmor less.

Description

  The present invention relates to an optical fiber winding method, a bobbin wound optical fiber, and an optical fiber transport method.

  Conventionally, when an optical fiber is transported, a bobbin around which the optical fiber is wound is accommodated and transported in a cardboard package. As this package, for example, one as shown in Patent Document 1 can be used.

JP-A-10-324370

  When a bobbin around which an optical fiber is wound is transported using a packing body used in Patent Document 1, if the winding tension when winding the optical fiber onto the bobbin is low, the optical fiber is transported. The optical fiber may collapse due to vibration or impact. Further, when the winding tension of the optical fiber is increased in order to prevent the optical fiber from collapsing, the optical fiber is subjected to a lateral pressure, which increases transmission loss.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an optical fiber winding method capable of both reducing transmission loss of an optical fiber and preventing the optical fiber from collapsing. Another object of the present invention is to provide a bobbin-wound optical fiber wound by this winding method and a method for transporting this optical fiber.

An optical fiber winding method of the present invention that can solve the above-mentioned problems is
T / P ² is 0.5 N / mm ² or more and 6.3 N, where T (N) is a winding tension when winding an optical fiber having an outer diameter of about 250 μm around a bobbin, and P (mm) is a traverse pitch. / Mm ² or less.

  The bobbin-wound optical fiber of the present invention is characterized by being wound around the bobbin by the above-described optical fiber winding method.

  The method for transporting an optical fiber according to the present invention is characterized in that the bobbin-wrapped optical fiber is accommodated in a packing box and transported.

According to the optical fiber transport method of the present invention,
A buffer material is disposed at the bottom of the packing box, and the bobbin-wrapped optical fiber is accommodated on the buffer material,
It is good also as a structure set so that the maximum value of the impact added to the said bobbin winding optical fiber may be set to less than 18.5G when the said packaging box in which the said bobbin winding optical fiber was dropped from 300 mm in height.

According to the optical fiber transport method of the present invention,
It is good also as a structure which conveys the said bobbin winding optical fiber so that the maximum value of the impact added to the said bobbin winding optical fiber is less than 18.5G.

  According to the present invention, an optical fiber is wound around a bobbin while adjusting the winding tension and traverse pitch of the optical fiber to be appropriate values. As a result, it is possible to prevent the optical fiber from collapsing when the bobbin-wrapped optical fiber is conveyed while suppressing transmission loss of the optical fiber as much as possible. Therefore, it is not necessary to rewind the optical fiber after conveyance, and workability can be improved.

It is a perspective view of the bobbin by which the optical fiber which concerns on this invention was wound up. It is a perspective view which shows an example of the packaging box in which the bobbin of FIG. 1 is accommodated. It is a top view which shows the state in which the bobbin was accommodated in the packaging box of FIG. It is a partial fragmentary sectional view of the packaging box of FIG.

  Hereinafter, an example of an embodiment according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the optical fiber 10 is, for example, one in which the outer periphery of a glass fiber composed of a core and a clad is coated with a resin, and the outer diameter thereof is, for example, 250 μm. The optical fiber 10 is bundled into an optical cable for use in optical communication, for example.

  The bobbin 11 for winding the optical fiber 10 is made of, for example, a synthetic resin such as plastic, and has a cylindrical body portion 11a and a pair of disk-shaped hooks provided at both ends of the body portion 11a. Part 11b.

  When the optical fiber 10 is wound around the bobbin 11, the optical fiber 10 needs to be wound evenly on the body 11 a of the bobbin 11. Therefore, the bobbin 11 winds the optical fiber 11 while being traversed in the axial direction of the bobbin 11 at a predetermined traverse speed by a traverse motor (not shown). The winding method of the optical fiber 10 is not limited to this bobbin traverse method. For example, a roller traverse in which the bobbin 1 is fixed and a guide roller that guides the optical fiber 10 before winding is traversed in the axial direction of the bobbin 11 and the optical fiber 10 is evenly wound on the body 11 a of the bobbin 11. A method may be adopted.

In this embodiment, the winding tension of the optical fiber 10 T (N), when the traverse pitch was P (mm), and T / ^{P 2} is 0.5 N / mm ² or more 6.3N / mm ² or less Thus, the optical fiber 10 is wound around the bobbin 11.

Here, the traverse pitch P indicates the amount of movement of the bobbin 11 or guide roller when the optical fiber 10 is wound around the bobbin 11 once. In the present embodiment, the traverse pitch P is, for example, 0.4 to 0.7 mm.
The winding tension T is considered to have a greater influence on the collapse and transmission loss than the traverse pitch P. That is, the change amount of the traverse pitch P is less likely to appear as a numerical value than the change amount of the winding tension T. Therefore, in this embodiment, by adopting “T / P ² ” that is a value obtained by dividing the winding tension T by the value obtained by squaring the traverse pitch P, the winding tension T and the traverse pitch P are balanced. ing.

  As shown in FIG. 2, the packaging box 20 according to the present embodiment has a box body 21 as a base structure. The box 21 has a bottom surface portion 22 that forms a bottom surface, a side surface portion 23 that forms a side surface, and an upper surface portion 24 that forms an upper surface.

  As shown in FIG. 3, a partition plate 25 is provided inside the box body 21 of the packing box 20, and a plurality of storage spaces S are formed inside the box body 21 by the partition plate 25. ing. In these accommodation spaces S, the bobbins 11 shown in FIG. 1 are accommodated.

  As the box 21, for example, a box having a length of 800 mm, a depth of 640 mm, and a height of 320 mm is used, and for example, eight bobbins 11 around which the optical fiber 10 is wound can be accommodated.

  As shown in FIG. 4, for example, a plurality of (three in this case) cushioning materials 27 formed of reinforced cardboard are disposed on the bottom surface portion 22 of the box body 21. The bobbin 11 is accommodated on the plurality of buffer materials 27.

  The optical fiber 10 is transported and stored in a state where it is wound around the bobbin 11 and accommodated in the accommodating space S of the packaging box 20.

  In general, the optical fiber 10 is housed and shipped in a packing box 20 while being wound around a bobbin 11, and is transported by a truck, a ship, an airplane, or the like.

When the optical fiber 10 wound around the bobbin 11 is transported, if the winding tension T when the optical fiber 10 is wound around the bobbin 11 is low, the optical fiber 10 is wound due to vibration or the like when transporting the optical fiber 10. Collapse may occur. Such unwinding of the optical fiber 10 causes disconnection when the optical fiber 10 is pulled out from the bobbin 11 to manufacture an optical cable. Therefore, the work of rewinding the optical fiber 10 is necessary, and workability is deteriorated. End up.
On the other hand, when the winding tension T of the optical fiber 10 is increased in order to prevent the optical fiber 10 from collapsing, the optical fibers 10 are in strong contact with each other, so that the glass fiber of the optical fiber 10 receives a lateral pressure and transmission loss is high. turn into.

  Further, if the traverse pitch P is narrowed more than necessary to prevent the optical fiber 10 from collapsing, the adjacent optical fibers 10 come into contact with each other, and the transmission loss of the optical fiber 10 is high due to the influence of the side pressure due to the contact between the optical fibers 10. turn into. On the other hand, if the traverse pitch P is widened, there will be an unnecessarily large gap between the adjacent optical fibers 10, so that there is a high possibility that the optical fiber 10 will collapse when the bobbin 11 is conveyed.

On the other hand, according to the optical fiber 10 according to the present embodiment, when the winding tension when the optical fiber 10 is wound around the bobbin 11 is T (N) and the traverse pitch is P (mm), T / P ² is set to be 0.5 N / mm ² or more 6.3N / mm ² or less. That is, the optical fiber 10 is wound around the bobbin 11 while adjusting the winding tension T and the traverse pitch P of the optical fiber 10 to be appropriate values. Thereby, it is possible to prevent the optical fiber 10 from collapsing when the bobbin 11 around which the optical fiber 10 is wound is accommodated in the packaging box 20 and conveyed while suppressing an increase in transmission loss of the optical fiber 10 as much as possible.

  And according to this optical fiber 10, while being able to suppress the disconnection of the optical fiber 10 accompanying the collapse of the optical fiber 10 after conveyance, the rewinding of the optical fiber 10 becomes unnecessary, and workability | operativity is improved. Can do.

  In the present embodiment, a plurality of cushioning materials 27 are arranged on the bottom surface portion 22 of the packing box 20, and the bobbins 11 are accommodated and transported on these cushioning materials 27. The impact applied to the optical fiber 10 can be suppressed, and the collapse of the optical fiber 10 can be reliably prevented.

(1) Evaluation of collapse The packaging box 20 containing eight bobbins 11 wound with the optical fiber 10 of a predetermined length is dropped from a height of 300 mm, and the optical fiber 10 in the packaging box 20 is collapsed at that time. Evaluated. As shown in Table 1, T / ^{P 2} is prepared bobbin 11 having a six values from 0.2 N / mm ² to 7.0 N / mm ^2, the winding of the optical fiber 10 after the drop test for each The collapse was evaluated.
Specifically, the bobbin 11 after the drop test was confirmed visually and by palpation to evaluate whether or not the optical fiber 10 was collapsed. In Table 1, “◯” indicates that no collapse was confirmed by visual inspection and palpation, and “△” indicates that there is no particular problem with visual inspection, but the optical fiber 10 wound around the bobbin 11 is touched by hand. The winding of the optical fiber 10 is slightly loose, indicating that the optical fiber 10 has moved easily. “X” indicates that the optical fiber 10 has been confirmed to be collapsed by visual observation.

(2) Evaluation of transmission loss Next, using an optical pulse tester (OTDR: Optical Time Domain Reflectometer) with a wavelength of 1.55 μm, an optical pulse is incident from the end face of the optical fiber 10 wound under each condition. The transmission loss (OTDR waveform) of the optical fiber 10 was evaluated. Specifically, whether the loss increase at the beginning winding bobbin 11 (under the bobbin winding) occurs, the evaluation as well as T / ^{P 2} of collapse winding is 0.2 N / mm ² to 7.0 N / mm ² N = 200 was evaluated for each of the bobbins having the six types of values. When the winding tension T is high, stress is particularly applied to the lower opening side of the optical fiber 10 wound around the bobbin 11, so that the transmission loss is increased on the lower opening side, and as a result, the loss at the lower bobbin winding increases. To do.
In this example, the case where there was an increase in loss in the bobbin lower winding was regarded as defective, and the rate of occurrence of loss increase in the bobbin lower winding (rewinding rate requiring rewinding) was evaluated. When the rewinding rate is less than 1%, “◯ (good)”, when the rewinding rate is 1% or more and less than 10%, “△ (normal)”, and when the rewinding rate is 10% or more, “×” (Bad).

(3) Evaluation results Table 1 shows the evaluation results of the collapse and transmission loss.

As shown in Table 1, in the evaluation of the roll collapse, the roll collapse was visually confirmed when T / P ² was 0.2 N / mm. However, when T / P ² was 0.5 N / mm, the roll collapse was visually observed. No collapse was confirmed, and it was confirmed by palpation that the winding of the optical fiber 10 was somewhat loose. In addition, when T / P ² was 2.4 to 7.0 N / mm, no collapse was observed visually and by palpation.
In the evaluation of the transmission loss, Saimakiritsu the T / ^{P 2} is 0.2~4.4N / mm is good, re-winding ratio in T / ^{P 2} is 6.3N / mm is a common However, the rewinding rate was poor when T / P ² was 7.0 N / mm.

Thus, in the case T / ^{P 2} is 0.5 N / mm ² or more 6.3N / mm ² or less, it is an acceptable range for the winding collapse and transmission loss of the optical fiber 10 was confirmed.

Also, falling in the evaluation of the above (1) winding collapse, the optical fiber 10, especially wound T / ^{P 2} as 0.5 N / mm ² or more 6.3N / mm ² or less, the optical fiber 10 from a height 300mm It was found that the collapse of the optical fiber 10 hardly occurs when the maximum value of the impact applied to the optical fiber 10 is less than 18.5 G. In general, since the impact applied to the optical fiber 10 during transportation is smaller than the impact applied to the optical fiber 10 when dropped from a height of 300 mm, the maximum value of the impact applied to the optical fiber 10 is 18.5G. It can be said that if the bobbin 11 is conveyed so as to be less than that, the collapse of the optical fiber 10 can be reliably prevented.

  Although an example of an embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and other configurations can be adopted as necessary.

  For example, the box body 21 constituting the packing box 20 may be other than a cardboard box, and may be made of, for example, hard plastic.

10: Optical fiber, 11: Bobbin, 20: Packing box, 21: Box body, 25: Partition plate, 27: Buffer material

Claims (5)

An optical fiber winding method,
T / P ² is 0.5 N / mm ² or more and 6.3 N, where T (N) is a winding tension when winding an optical fiber having an outer diameter of about 250 μm around a bobbin, and P (mm) is a traverse pitch. / Mm < ² > or less, The optical fiber winding method characterized by the above-mentioned.   A bobbin-wound optical fiber which is wound around the bobbin by the optical fiber winding method according to claim 1.   A bobbin-wound optical fiber according to claim 2 is accommodated in a packing box and transported. It is a conveyance method of the optical fiber according to claim 3,
A buffer material is disposed at the bottom of the packing box, and the bobbin-wrapped optical fiber is accommodated on the buffer material,
The maximum value of the impact applied to the bobbin-wound optical fiber when the packaging box containing the bobbin-wound optical fiber is dropped from a height of 300 mm is set to be less than 18.5 G. Optical fiber transport method. It is a conveyance method of the optical fiber according to claim 3,
A method of transporting an optical fiber, wherein the bobbin-wrapped optical fiber is transported so that a maximum value of impact applied to the bobbin-wrapped optical fiber is less than 18.5 G.

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