JPH0857397A - Device for coating strip with resin - Google Patents

Abstract

PURPOSE: To provide the highly reliable device capable of minutely adjusting the supply of resin in accordance with the velocity of a traveling strip and its outer diameter and without causing nonuniform coating or the inclusion of bubbles. CONSTITUTION: This device is provided with a pressurizing tank 1 to supply a pressurized fluid, a closed feed tank 2 into which the pressurized fluid from the tank 1 is introduced through a solenoid valve 6, a closed die 3 supplied with a pressurized resin from a resin container 21 set in the feed tank 2 and coating a traveling optical fiber 102 with the resin and a means 4 to detect the outer diameter of the coated optical fiber 102, and the solenoid valve 6 is controlled in accordance with the detected outer diameter of the optical fiber 102.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear resin coating device for coating a running linear body with a predetermined resin.

[0002]

2. Description of the Related Art A coating apparatus shown in FIG. 2 is known as a coating apparatus for coating a running linear body, for example, an outer peripheral surface of an optical fiber with a predetermined resin.

This coating apparatus includes a die 10 for containing a predetermined UV resin (hereinafter abbreviated as resin) 100.
The resin is automatically supplied to the running optical fiber 102 from 1 at a constant amount. Since the resin contained in the die 101 is naturally reduced in the coating apparatus, appropriate means, for example, the liquid level sensor 103 is installed, and the resin to be contained has a predetermined level. Metering pump 1
04 is operated to replenish the resin to a predetermined level.

[0004]

However, the resin supply by the liquid level control as described above has the following disadvantages. The traveling speed of the filament to be coated is not always constant and may change for various reasons, but it is not possible to correspond to that speed with liquid level control, causing uneven coating. Sometimes. The resin contained in the die is replenished all at once when the liquid level drops to a predetermined level, in other words, a relatively large amount is replenished at one time. The bubbles are likely to be generated, and the bubbles may be coated on the linear body while being mixed with the resin. Since the pump is used to replenish the resin, it is not only prone to failure, but also requires troublesome maintenance and management, and is also problematic in terms of durability.

In view of the above-mentioned drawbacks, therefore, the present invention makes it possible to finely adjust the supply amount according to the speed and outer diameter of the traveling linear member, and to reduce the possibility of coating unevenness and bubbles mixing. Then, it aims at providing a highly reliable resin coating apparatus.

[0006]

That is, the present invention is a linear resin coating device for coating a running linear resin with a predetermined resin. A sealed supply tank into which a pressurized fluid is sent, and a resin that is sent under pressure from a resin container provided in this supply tank, and the running filament is coated with the resin. A die and a detection means for detecting the outer diameter dimension and / or the traveling speed of the coated linear body, and the detection means detects the outer diameter dimension and / or the traveling speed of the linear body according to the outer diameter dimension and / or the traveling speed. The solenoid valve is controlled to adjust the applied pressure.

[0007]

According to the present invention, the die is hermetically sealed so that the internal pressure can be freely adjusted, and the detection means is provided. The detection means constantly detects the outer diameter dimension and the traveling speed of the coated filament, and the die is The linear body can be satisfactorily coated by pumping the resin under the optimum internal pressure condition according to the size and speed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram showing a resin coating device for an optical fiber according to the present invention. This resin coating apparatus includes a pressure tank 1, a supply tank 2,
Die 3, outer diameter detecting means 4, controller 5, solenoid valve 6
It consists of and.

The pressure tank 1 is connected to the supply tank 2 in an airtight state via a communication pipe 11, and is filled with constantly pressurized air, nitrogen gas (N ₂ ) or other appropriate fluid. ing. The fluid filled in the pressure tank is preferably an inert gas which is incombustible and hardly reacts with the resin.

The supply tank 2 has a closed structure in which a pressurized fluid is sent from the pressure tank 1 through an electromagnetic valve 6, and a UV resin tank 21 having an open mouth is housed inside. . The UV resin tank 21 is connected to the die 3 in an airtight state via a communication pipe 22.
Not only the UV resin is supplied to, but the internal pressures of both sides are maintained almost even.

The die 3 is hermetically sealed and kept airtight, and the resin is continuously supplied from the UV resin tank 21 at a constant amount while adjusting the internal pressure. Need not be installed.

The outer diameter detecting means 4 is adapted to constantly detect the outer diameter dimension of the coated optical fiber 102, and an optical means is used. Then, a detection signal according to the outer diameter dimension detected by the outer diameter detecting means 4 is
The data is immediately output to the control unit 5, and is connected to the input of the control unit 5. In this embodiment, only the outer diameter dimension is detected, but the present invention is not limited to this, and the traveling speed of the linear member 102 may be detected, or both of them may be detected. You may.

The control section 5 has its input connected to the output of the outer diameter detecting means 4 in order to constantly adjust the internal pressure of the die 3 to an optimum state according to the outer diameter dimension of the optical fiber 102 from the input detection signal. At the same time, the output is connected to the solenoid valve 6, and the amount of opening of the solenoid valve 6 is appropriately adjusted to an analog type or a digital type for pressure control.

Therefore, according to this embodiment, if the outer diameter dimension of the coated optical fiber 102 becomes larger than the set value at a certain time, for example, the outer diameter detecting means 4 will be described.
Detects this and outputs a detection signal corresponding thereto to the control unit 5. Then, the control unit 5 having received this signal immediately detects the increase in the outer diameter dimension and outputs an appropriate control signal to the solenoid valve 6. For this reason, the opening amount of the solenoid valve 6 is narrowed down to an optimum state, so that the internal pressure of the die 3 is suppressed to an appropriate state. This allows the optical fiber 102
Since the inner pressure is immediately changed to the optimum internal pressure for suppressing the increase of the outer diameter and the supply amount of the resin to be coated is also suppressed, it is possible to quickly return to the set optimum outer diameter dimension.

[0015]

As described above, according to the present invention, the die is hermetically sealed so that the internal pressure can be freely adjusted, and the detection for detecting the outer diameter of the filament and the traveling speed is performed. The detection means successively detects the outer diameter of the coated filament and the traveling speed, and the die is always finely adjusted to the optimum internal pressure state according to the outer diameter of the filament and the traveling speed. Adjust to force the resin to flow,
Since the filament can be coated in a good condition, high-quality resin coating can be realized.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a resin coating apparatus according to the present invention.

FIG. 2 is a schematic configuration diagram showing a conventional resin coating device.

[Explanation of symbols]

 1 pressurized tank 2 supply tank 3 die 4 outer diameter detection means 5 controller 6 solenoid valve 102 optical fiber (filament)

Claims (1)

[Claims] 1. A linear resin coating device for coating a predetermined resin on a running linear body (102), which comprises applying pressure from a pressure tank (1) through a solenoid valve (6). A closed supply tank (2) into which a pressurized fluid is sent, and a resin container (21) provided in the supply tank (2) to which the resin to be pressure-fed is supplied, and the linear body ( 102) is provided with a sealed die (3) for coating the resin, and a detection means (4) for detecting the outer diameter dimension and / or the traveling speed of the coated linear body (102). A wire configured to control the solenoid valve (6) according to the outer diameter dimension of the linear body (102) detected by the means (4) and / or the traveling speed to adjust the pressing force. Strip resin coating equipment.