JPH1062301A - Method and device for evaluating surface tackiness of optical fiber core wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and quantitatively evaluate the surface tackiness of an optical fiber core wire by measuring a tension change added to the optical fiber core wire in winding at a fixed tension. SOLUTION: An optical fiber core wire 20 is wound on a winding roll 2 a number of times, and introduced into a transmitting side dancer roll 4. It is introduced into a receiving roll 5 through a first fixed roll 4g, a moving roll 4a and a second fixed roll 4c, and set to a tension pickup 7 between the rolls 4a, 4c. The core wire 20 passed through the roll 5 is mounted on a winding roll 3 through a winding side dancer roll 6 similar to the roll 4. Then, the roll 3 is rotated to impart a fixed tension to the core wire 20. The pickup 7 detects the moving quantity of a detecting roll by the tension of the core wire 20 to detect the tension, and displays and records it on a monitor 8. In this case, the tension change added to the core wire 20 becomes a value according to the surface tackiness, the surface tackiness of the core wire 20 can be easily and quantitatively measured and evaluated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for evaluating the surface tackiness of an optical fiber.

[0002]

2. Description of the Related Art An optical fiber core is generally formed by forming a coating layer made of an ultraviolet-curable resin such as an ultraviolet-curable urethane acrylate resin on one or a plurality of optical fibers. When storing the optical fiber, the optical fiber is wound around the bobbin many times. However, since the surface of the coating layer of the above-mentioned optical fiber core wire shows a slight adhesiveness (hereinafter referred to as surface tackiness), when the optical fiber core wires are stored on the bobbin in a state of being overlapped with each other for a long time, the overlapped light is The so-called blocking may occur where the fiber core wires adhere to each other and cannot be fed out.

[0003]

In order to evaluate the degree of adhesion between the optical fiber cores, conventionally, the optical fiber core wound on the bobbin is partially cut while being overlapped on the bobbin. Then, a method of visually confirming whether or not the optical fibers of the cut portion are bonded to each other is adopted. However, such a method for evaluating the surface tackiness is qualitative, and a method that can be evaluated more quantitatively has been demanded. The present invention has been made in view of the above circumstances, and has as its object to provide a method and an apparatus for easily and quantitatively evaluating the surface tackiness of an optical fiber.

[0004]

In order to solve the above-mentioned problems, the present invention employs the following method and apparatus for evaluating surface tackiness. The evaluation method of the surface tackiness of the present invention,
The optical fiber ribbon wound many times in a state of being overlapped on the delivery roll is wound up with a constant tension, and the surface tackiness of the optical fiber core wire is determined from the change in the tension applied to the optical fiber core during this winding. It is characterized by seeking. The surface tackiness evaluation device according to the present invention includes a delivery roll that is wound a number of times in a state where the optical fiber cores are overlapped with each other, and winds the optical fiber core wound on the delivery roll with a constant tension. And a tension measuring means disposed between the delivery roll and the winding means for measuring the tension applied to the optical fiber to be wound.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing an example of an apparatus for evaluating surface tackiness used in the method for evaluating surface tackiness according to the present invention. 1) a delivery roll 2 on which the optical fiber is wound around the body, a winding roll 3 serving as a winding means for winding the optical fiber sent from the delivery roll, and A sending-side dancer roll 4, a take-up roll 5, a take-up dancer roll 6,
A tension pickup 7 provided on the sending-out dancer roll 4.

[0006] The delivery roll 2 is, for example, a roll having a trunk diameter of 30 cm, and is capable of winding a long optical fiber core wire around the trunk. The delivery-side dancer roll 4 includes a movable roll 4a that can move upward, and first and second fixed rolls 4b and 4c provided above both sides of the movable roll 4a. The optical fiber core of the subject is guided to the dancer roll 4 through the first fixed roll 4b, the moving roll 4a, and the second fixed roll 4c in this order. When the tension applied to exceeds a predetermined amount,
The moving roll 4a moves to the fixed roll side to reduce the tension.

A tension pickup 7 is provided between the moving roll 4a and the second fixed roll 4c of the delivery-side dancer roll 4 as tension measuring means for measuring the tension applied to the optical fiber core at the time of winding. The tension pickup 7 is connected to a monitor 8 for displaying and recording the measured tension. As shown in FIG. 2, the tension pickup 7 has a detection roll 7a movable on the main body 9 and first and second auxiliary rolls 7b, 7 provided on both sides of the detection roll 7a.
c is provided. In the tension pickup 7, the optical fiber of the subject is guided through the lower part of the first auxiliary roll 7b, the upper part of the detection roll 7a, and the lower part of the second auxiliary roll 7c in this order. When the tension applied to the optical fiber core increases, the detection roll 7a is pressed upward by the optical fiber core and moves upward. The amount of movement is detected by a built-in strain gauge, and the optical fiber is detected based on the amount of movement. The tension applied to the cord is measured and can be displayed on the monitor 8.

The take-up roll 5 is for preventing a deviation in the winding direction of the optical fiber at the time of take-up. The take-up roll 5 includes a main roll 5a and a rubber belt 5 which is in contact with the outer periphery of the main roll 5a.
b, so that the optical fiber of the subject is guided between the main roll 5a and the rubber belt 5b. The take-up dancer roll 6 includes a moving roll 6a and first and second fixed rolls 6b and 6c, and has the same structure as the sending-out dancer roll 4.
The take-up roll 3 is rotated in a circumferential direction by a drive source (not shown), and can take up the optical fiber core wire with a constant tension.

Next, a method for evaluating the surface tackiness of an optical fiber core using the evaluation apparatus 1 will be described. First, according to the following procedure, the optical fiber core wire 20 to be inspected is used.
Is set in the evaluation device 1. The optical fiber core wire 20 is wound around the winding roll 2 many times so that the core wires overlap each other. Next, the optical fiber core wire 20 wound on the winding roll 2 is fed out from one end thereof, and is introduced into the sending-side dancer roll 4. In this dancer roll 4, the optical fiber core wire 20 is composed of a first fixed roll 4b, a moving roll 4a,
And the second fixed roll 4c is guided in this order. At this time, the optical fiber 20 between the moving roll 4a and the second fixed roll 4c is set on the tension pickup 7.

Next, the optical fiber core wire 20 having passed through the sending-side dancer roll 4 is introduced into the take-up roll 5. At this time, the optical fiber 20 is sandwiched between the main roll 5a and the rubber belt 5b. Optical fiber core wire 2 passing through take-up roll 5
0 is introduced into the take-up dancer roll 6, and the first fixed roll 6b and the moving roll 6
a, the second fixed roll 6c is guided to pass in this order. Subsequently, the optical fiber core wire 20 passing through the take-up dancer roll 6 is guided toward the take-up roll 3 and attached to the take-up roll 3.

After setting the optical fiber core 20 in the evaluation device 1 as described above, a drive source (not shown) is driven to rotate the winding roll 3 in the winding direction, and the optical fiber core 20 is Winding is performed at a constant tension, the tension applied to the optical fiber 20 is measured by the tension pickup 7, and the measured value is recorded on the monitor 8. If the surface tackiness of the optical fiber 20 is relatively low, the winding of the optical fiber 20 from the winding roll 2 becomes smooth during this winding process, and the winding of the optical fiber 20 is performed by winding.
The amount of change in tension applied is small. However, take-up roll 2
When the optical fiber cores 20 that overlap each other are partially adhered to each other due to their surface tackiness and are difficult to be drawn out, the tension applied to the optical fiber cores 20 by winding greatly changes.

As described above, the optical fiber 2
Since the change in tension applied to zero is a value corresponding to the surface tackiness, the evaluation device 1 having the above configuration can easily and quantitatively measure the surface tackiness of the optical fiber 20 from the change in tension. Can be. In addition, by measuring the surface tackiness in this way, it is possible to predict in advance whether or not blocking will occur when the optical fiber core is wound around the bobbin for a long period of time. Further, according to the method for evaluating the surface tackiness using the evaluation device 1, the surface tackiness of the optical fiber 20 can be easily and quantitatively measured.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Three types of optical fiber core wires having a coating layer formed on an optical fiber and having an outer diameter of 250 μm and a length of 10,000 m were manufactured by changing the ultraviolet curing resin for forming the coating layer. The evaluation device 1 shown in FIG.
And wound on a take-up roll 2 (body diameter 30 cm) in a state of being overlapped with each other a number of times, and taken up by a take-up roll 3 at a tension of 50 gf. The tension applied to each of the optical fibers during the winding was measured by the tension pickup 7 over the entire winding process, and the change in the tension was recorded (Examples 1 to 3). Table 1 shows the difference between the maximum value and the minimum value of the tension recorded in each example.

Next, the optical fiber core wires used in these examples are wound around a bobbin having a body diameter of 30 cm many times in a state of being overlapped with each other and stored at 40 ° C. for one month. It was checked whether the core wire could be extended from the bobbin. The case where the feeding was smoothly performed was evaluated as ○, and the case where the optical fiber core was blocked on the bobbin and the feeding was not possible was evaluated as ×,
The results are shown in Table 1.

[0015]

[Table 1]

As shown in Table 1, in Example 3 where the change in tension was relatively large, blocking of the optical fiber core occurred after storage for one month, whereas Examples 1 and 2 where the change in tension was small. It can be seen that smooth feeding was possible even after storage for one month.

[0017]

According to the evaluation method of the present invention, the surface of the optical fiber is measured by measuring the change in the tension applied to the optical fiber when the optical fiber is wound at a constant tension. The tackiness can be easily and quantitatively measured. In addition, by measuring the surface tackiness in this way, it is possible to predict in advance the occurrence of blocking when the optical fiber core is wound around the bobbin for a long period of time. According to the evaluation device of the present invention,
The surface tackiness of the optical fiber can be easily and quantitatively measured.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of an evaluation device of the present invention.

FIG. 2 is a front view showing a tension pickup of the evaluation device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Evaluation device, 2 ... Sending roll, 3 ... Winding roll (winding means), 7 ... Tension pickup (tensile measuring means)

Claims (2)

[Claims] An optical fiber core wound a large number of times in a state of being overlapped on a delivery roll is wound up at a constant tension, and a change in tension applied to the optical fiber core at the time of winding is taken into account. A method for evaluating the surface tackiness of an optical fiber core, comprising determining the surface tackiness of a fiber. 2. A delivery roll that is wound a number of times with optical fiber cores overlapping each other, winding means for winding the optical fiber core wound on the delivery roll with a constant tension, An evaluation of the surface tackiness of the optical fiber core, comprising: tension measuring means disposed between the delivery roll and the winding means for measuring the tension applied to the optical fiber core to be wound. apparatus.