JPS5833025B2 - Tofusouchi - Google Patents

Description

Detailed Description of the Invention The present invention involves applying a thermosetting resin such as an epoxy resin, a low viscosity resin such as a varnish, or a paint to a thickness of 1 to 10 μm to a thin metal or non-metal wire having a diameter of 1 mm or less. This relates to a device that performs insulation or reinforcement by baking or reacting in a furnace.

Conventionally, in this type of apparatus, as shown in FIG.
The wire is baked or reacted and hardened, forming an insulating or reinforcing layer for the wire, which is then wound onto a bobbin or the like.

The role of the felt 3 or sponge in this case is to remove excess resin or paint applied to the line 1 by the application device 2;
By making the adhesion resistance of the surface uniform, and by keeping the surface tension and adhesion resistance of the adhesion-resistant resin or paint on the surface, and the adhesion between the wire and the adhesion resistance, in a well-balanced state, the hardened layer after baking or reaction is The purpose is to equalize the thickness and eliminate eccentricity between the hardened layer and the wire.

Particularly when coating a glass fiber core wire with a resin as a reinforcing layer, such as an optical fiber, the coating method and the uniformity of the adhesion resistance are major problems.

If the thickness, size, material, and pressing or squeezing force of the felt or sponge are properly set, the cured layer 5 of the cured resin or paint will be uniform along the line as shown in Figure 2 a. .

It is well known that if the drawing is not done using felt or sponge, the line will look like the one shown in Figure 2, and the appearance and properties will be significantly worse.

This phenomenon occurs regardless of whether the manufacturing line shown in Figure 1 is horizontal (lines run horizontally) or vertical (lines run vertically), and the above discussion can be applied regardless of whether the line is vertical or horizontal.

However, the weak point of the method shown in Figure 1 is that while the line is running, excess resin or paint is squeezed by the felt or sponge, so it accumulates on the felt or sponge and its wetness changes, causing it to pass through the felt or sponge. The subsequent adhesion resistance changes over time, and the cured layer, which was initially good as shown in Figure 2a, gradually deteriorates as shown in Figure 2.

Furthermore, depending on the type of resin or paint, the resin or paint accumulated on the felt or sponge may harden on the felt or sponge part due to ambient temperature or other factors during operation, which may cause line breaks.

The present invention not only provides a means to overcome the above-mentioned weaknesses, but also provides a method for automatically controlling the thickness of the cured layer by selecting appropriate conditions.

One embodiment of the present invention will be described with reference to FIG.

The line 1 whose surface is coated with resin or paint in the application section is squeezed with felt 3 or sponge on the circumference of roller 6 to obtain a uniform amount of resin or paint.

At this time, the felt 3 or sponge is transferred to the third
Since it rotates in the rotational direction indicated by the arrow in the figure at a circumferential speed that is extremely slow compared to the linear speed, the wet state of the constricted portion is always maintained uniformly.

7 is a motor that rotates the roller 6 and a speed reduction system.

For example, if it is running at a linear speed of 10 m/min, and the outer diameter of the felt 3 is 50 mm and the rotation speed is 0.1 rpm, the peripheral speed is 0.1
minute, which is 0.15% of the linear velocity.

Conversely, the effect of felt rotation is 0.15 of the linear velocity.
This is simply a change in the amount of coating due to a change in percentage.

As is clear from the above simple calculation, when the felt is rotated at an extremely low circumferential speed, it can be considered that the felt is almost in a stopped state.

The pressing force of the felt at this time can be easily achieved by rotating the servo motor 8 and pressing the axis of the roller 6 with the spring 11 using the mechanism of the screw 9 and nut part 10 (fixed).

Therefore, the pressing force can be adjusted by rotating the operator sabot moke 8 or by manually turning the screw 9.

In addition, in this method, the thickness of the cured layer can be easily controlled by measuring the wire diameter after curing and feeding it back to the roller rotation motor 7 or the pressing force control motor 8.

The simplest embodiment is shown in Fig. 3, but in this case, it becomes unusable after the felt has rotated once, so by making use of this basic embodiment shown in Fig. Examples are shown in FIGS. 4 and 5.

In FIG. 4, the felt 3 of the aperture is arranged in a capsun shape, so that the operating time, that is, the interval between felt replacements can be made longer than in the case of FIG.

In FIG. 5, the strip of felt 3 is pulled out from the supply stand 12 by driving the pinch roller 13 for take-up by the motor 14, and the felt that has finished its use is collected into a collection box 15.

(In FIG. 5, only the right half is shown in detail, but the left half is omitted.) The holding force of the holding portion 16 can be adjusted by installing the same mechanism as shown in FIG. 3.

In addition to the above-mentioned method, there are various methods of adjusting the pressing force, such as a method using weights and a method using air, and any of these methods may be used.

Further, in FIG. 5, the felt is pulled out by a roller 13a with needles, but various shapes of the roller can be considered, and one method is to wind it up directly on a drum.

The coating device of the present invention includes an optical fiber primary coat,
This can be applied to enameled wires, etc.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of a production line that applies resin or paint to thin wires, and Figures 2a and b show lines with a uniformly hardened layer of resin or paint and unevenly hardened layers, respectively. The explanatory drawings and FIGS. 3 to 5 show the main parts (
FIG. 3 is an explanatory view of an example (squeezed portion of excessively applied resin or paint). 1 is a thin wire, 2 is a coating device, 3 is a squeezer, 4 is a baking oven, 5 is a hardened layer of resin or paint, 6 is a roller, 7 is a motor, 8 is a servo motor, 9 is a screw, 10 is a nut part, 11 is a spring, 12 is a supply stand, 13 is a pinch roller, 13
14 is a motor, 15 is a used felt collection box, and 16 is a presser foot.

Claims (1)

[Claims] 1. In a coating device for applying low viscosity resin or paint to a thin line, which is avoided from the application section, squeezing section, and baking oven, in order to make the low viscosity resin or paint applied to the thin line that has passed through the application section to a constant thickness. To thin wires of low viscosity resin or paint, characterized in that felt or sponge, etc. with a squeeze to remove excess is continuously supplied and has a mechanism to control the wetness of the felt or sponge at a constant level. coating equipment.