JPH09142871A - Glass fiber producing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of clogging of a spinning nozzle and discoloration of a glass fiber and to provide an economic glass producing apparatus. SOLUTION: In this glass fiber producing apparatus equipped with a feeder 3 having plural flow holes on a flow channel floor of a molten glass 2 and a spinning bushing attached to each flow hole, the bushing 8 fitted to the flow hole 5 positioned at the highest upper stream of the feeder 3 has a weir 8a for stop defective glass 13 flowing along the flow channel floor of the feeder and comprises a section equipped with a drain nozzle 8d for discharging the defective glass 13 stopped by the weir 8a and a section equipped with a spinning nozzle 8e for spinning high-quality glass 12 flowing over the weir 8a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass fiber manufacturing apparatus.

[0002]

2. Description of the Related Art Generally, a glass fiber manufacturing apparatus has a feeder 23 through which a molten glass 22 melted in a melting furnace 21 flows, as shown in FIG. This feeder 23
A plurality of flow holes 25 and 26 are provided at a predetermined interval along the flow direction 24 of the molten glass 22 on the flow path floor of the spinning glass, and a spinning process having a large number of spinning nozzles under each flow hole. Bushings 27, 28 are attached. The glass fibers 29 are manufactured by spinning the glass by pulling out the glass from each of the spinning nozzles.

In such a glass fiber manufacturing apparatus,
Immediately after a new furnace construction or periodic repair, the glass becomes inhomogeneous and contains a large amount of foreign substances such as refractory pieces.Therefore, replace the normal spinning bushing only during the period until the glass quality stabilizes. Different kinds of glass, foreign substances, etc. are discharged using a drain bushing having two to three relatively large drain nozzles, and when the glass quality is stabilized, it is replaced with a spinning bushing having a spinning nozzle. (See, for example, Japanese Patent Publication No. 62-35978).

[0004]

However, in the melting furnace, it is a constituent component of the refractory material used for the furnace wall and the like not only during new construction or regular repairs but also during subsequent normal production. Cr, Zr, etc. may be eroded by the molten glass and eluted as impurities in the molten glass. In that case, the Cr and Zr components hardly diffuse into the molten glass, and since the defective glass having a high Cr and Zr concentration has a large specific gravity, it flows along the flow path floor of the feeder. Therefore, defective glass will flow into the spinning bushing (hereinafter referred to as the leading bushing) provided in the most upstream flow hole (hereinafter referred to as the leading flow hole), causing clogging of the spinning nozzle. In some cases, spinning cannot be performed, and the glass fiber spun by the leading bushing is colored by Cr.

As described above, since the technique disclosed in the above publication discharges foreign glass, foreign matters, etc. only during a certain period after new construction of the furnace or periodical repair, clogging of the spinning nozzle and glass fiber during normal production are performed. Can not solve the problem of coloring.

On the other hand, if the leading bushing is always used only for the drain of defective glass, there is a problem that the number of spinning bushings is reduced and the productivity is lowered.

An object of the present invention is to solve the above problems of clogging of spinning nozzles and coloring of glass fibers and to provide an economical glass fiber manufacturing apparatus.

[0008]

The glass fiber manufacturing apparatus of the present invention made to achieve the above object comprises a feeder having a plurality of flow holes in a flow passage floor of molten glass,
In a glass fiber manufacturing apparatus in which each flow hole is provided with a spinning bushing, the bushing provided in the flow hole located at the most upstream side of the feeder stops defective glass flowing along the flow path floor of the feeder. It has a weir, and is composed of a part provided with a drain nozzle for discharging defective glass stopped by the weir, and a part provided with a spinning nozzle for spinning good quality glass flowing over the weir. It is characterized by

[0009]

In the present invention, the bushing provided in the flow hole located at the most upstream side of the feeder has a weir for stopping defective glass flowing along the flow passage floor of the feeder, and is stopped by the weir. It is composed of a part provided with a drain nozzle for discharging defective glass and a part provided with a spinning nozzle for spinning good quality glass flowing over the weir. Good quality glass can be spun from the spinning nozzle while constantly discharging. Therefore, not only during the period when glass becomes inhomogeneous immediately after a new furnace construction or periodic repair, or when the glass quality becomes unstable due to the inclusion of a large amount of foreign substances such as refractory pieces, during normal glass fiber production. In this case, defective glass having a large specific gravity containing Cr, Zr, etc., which are the constituents of the refractory used for the furnace wall, etc. does not flow into the bushing provided with the spinning nozzle located downstream from the weir. The clogging of the spinning nozzle of the bushing and the coloring of the glass fiber by Cr can be prevented.

Further, in the present invention, since the leading bushing has both a drain for constantly discharging defective glass and a spinning bushing, it is not necessary to replace the drain dedicated bushing with the spinning bushing as in the prior art. Effective in production and equipment.

[0011]

EXAMPLE An example of the glass fiber manufacturing apparatus according to the present invention will be described below.

As shown in FIG. 1, the melting furnace 1 is made of Cr ₂ O.
It is made of refractory materials including ₃ and ZrO ₂ . The molten glass 2 melted in the melting furnace 1 is made to flow in a traveling direction 4 toward a feeder 3. A plurality of flow holes 5, 6, 7 are provided at predetermined intervals in the traveling direction 4 on the flow path floor of the molten glass of the feeder 3. A leading bushing 8 is attached to the leading flow hole 5 located on the most upstream side of the feeder 3. The head bushing 8 has a weir 8a extending upward from the inside to stop the defective glass 13, and a single or a plurality of drain nozzles 8d for discharging the defective glass 13 stopped by the weir 8a are provided. Drain part 8b provided and good quality glass 1
Spinning station 8 provided with a spinning nozzle 8e for spinning 2.
c. Second and subsequent flow holes 6, 7
Spinning bushings 9 and 10 are attached to each of them.
These spinning bushings 9 and 10 have a large number of spinning nozzles. Below each bushing, a spinning means such as a winder is arranged, and when the good quality glass 12 is drawn out through each spinning nozzle and spinning is performed, the glass fiber 11 can be manufactured.

FIG. 1 is a schematic view showing a cross section of a leading bushing 8 having a weir 8a and a drain portion 8b into which a defective glass 13 flows and a portion 8c into which a good quality glass 12 flows. More specifically, as shown in FIG. 2, a weir 8a is provided on the leading bushing 8 and a partition wall 8f is arranged parallel to the traveling direction 4 to close the upper part of the spinning section 8c located upstream of the weir 8a. By providing the lid 8h on the upstream side and the lid 8i on the downstream side of the weir that closes the upper part of the drain portion 8b located downstream of the weir 8a, the drain portion 8b and the spinning portion 8c are arranged in parallel to the traveling direction 4. Is done.

A leading bushing 8 having the structure shown in FIG.
Is made of platinum and an alloy of 90% platinum and 10% rhodium, has a length of 200 mm parallel to the traveling direction 4, a width of 500 mm orthogonal to the traveling direction 4, and a height of 40 mm at the center of the upper portion of a bushing having a depth of 50 mm. It has a weir 8a having a thickness of 1 mm and a size that traverses the leading flow hole 5, and the opening for letting the defective glass 13 flow into the bushing is 10 in length.
The opening is 0 mm × width 150 mm, and the opening through which the good quality glass 12 flows into the bushing is 100 mm long × 350 mm wide. Inside the bushing, a drain portion 8b having a plate on which 800 chips of a drain nozzle 8d having an inner diameter of 2.0 mm for discharging the defective glass 13 are provided.
And a spinning section 8c having a plate provided with 1800 chips of a spinning nozzle 8e having an inner diameter of 1.5 mm for spinning the high-quality glass 12 are separated by a partition wall 8f.

The case where the glass fiber 11 is obtained by melting and spinning glass by using the apparatus shown in FIGS. 1 and 2 will be described below.

First, the glass raw material is melted in the melting furnace 1, and the melted molten glass 2 is flowed toward the feeder 3 and attached to the leading flow hole 5 of the flow passage floor of the feeder 3 as shown in FIG. It was supplied to the head bushing 8. In the leading bushing 8, the defective glass 13 flowing along the flow path floor of the feeder 3 is stopped by the weir 8a located above the leading bushing 8, and the stopped defective glass 13 is then drained by the drain nozzle 8d. I was led to location 8b. The good quality glass 12 that has flowed over the weir 8a is the spinning nozzle 8
e was introduced to the spinning station 8c. At the drain portion 8b, the defective glass 13 stopped by the weir 8a does not accumulate and cross over the weir 8a.
At the spinning section 8c, the good quality glass 12 was drawn out through the spinning nozzle 8e and the glass fiber 11 was spun. Defective glass 1 discharged above
3 was treated as cullet and reused.

[0017]

According to the glass fiber manufacturing apparatus of the present invention, the leading bushing serves both as a drain for constantly discharging defective glass having a large specific gravity and a spinning bushing, so that defective glass is always discharged during production. Therefore, it is possible to prevent clogging of the spinning nozzle and coloring of the glass fiber, and it is possible to produce a large amount of glass fiber of good quality, which is a practically excellent effect.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a glass fiber manufacturing apparatus of the present invention.

FIG. 2 is a perspective view showing a specific example of a leading bushing used in the present invention.

FIG. 3 is an explanatory view showing a conventional glass-glass fiber manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melting furnace 2 Molten glass 3 Feeder 4 Direction of movement 5 Leading flow hole 6, 7 Flow hole 8 Leading bushing 8a Weir 8b Drain part 8c Spinning part 8d Drain nozzle 8e Spinning nozzle 8f Partition wall 8h Weir upstream lid 8i Weir downstream Lid 9, 10 Bushing for spinning 11 Glass fiber 12 Good quality glass 13 Bad glass

Claims (1)

[Claims] 1. A glass fiber manufacturing apparatus comprising a feeder having a plurality of flow holes in a flow passage of molten glass, and a spinning bushing provided in each of the flow holes, wherein the flow hole is located at the most upstream position of the feeder. The provided bushing has a weir that stops the defective glass flowing along the flow path floor of the feeder, and a portion provided with a drain nozzle that discharges the defective glass stopped by the weir and the weir. An apparatus for producing a glass fiber, comprising: a portion provided with a spinning nozzle for spinning a high-quality glass flowing over the glass fiber.