JPS605536B2 - Method and device for preventing devitrification of molten glass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a glass fiber thread, and more particularly to a method and device for preventing devitrification of molten glass in a glass weaving total spinning device.

Conventionally, a nearly horizontal channel that receives molten glass, a flow path formed on the bottom wall of this channel through which the molten glass flows down, and a flow path that is installed in alignment with this flow path to collect the molten glass that has flowed down the flow path. Glass fiber paper yarn devices having a pusher for weaving glass are known.

Recently, in such glass fiber paper yarn machines, it has become necessary to weave glass fibers from glass materials that are prone to devitrification and tend to have problems with meltability and grading properties, such as alkali-resistant glass fibers. It is in operation. For example, glass materials for alkali-resistant glass fibers generally contain a large amount of ZrO2, but glass materials containing such a large amount of ZrO2 and glass materials with other special compositions are almost always in the liquid phase. The temperature is higher than that of ordinary glass, and the difference between the paper yarn temperature (viscosity at 1 poise) and the liquidus temperature is small, for example, the difference is 3000 or less. Therefore, it is easy to crystallize during cutting, and the problem of devitrification is extremely likely to occur. The occurrence of devitrification in the molten glass becomes a cause of breakage of the glass fiber paper yarn. The object of the present invention is to
When spinning glass fibers from glass materials that contain a large amount of 02 components or have a special glass composition that easily devitrifies, it can prevent devitrification of the molten glass and reduce the factors that cause glass fibers to break. An object of the present invention is to provide a method and device for preventing devitrification of molten glass.

Conventionally, the problem of devitrification that occurs when weaving glass materials that are prone to devitrification, such as those containing a large amount of two components of Z or having a special glass composition, is that devitrification is formed within the bushing or on the bottom surface of the bushing. The problem of molten glass in the chip/zure has been discussed.

However, as a result of various studies, it has been found that there is a problem in which the molten glass becomes a bigger obstacle in the process of entering the bushing from the channel of the furnace. To explain this point using the case of alkali-resistant glass fiber glass materials as an example, glass materials containing a large amount of Z"02 tend to have two components of Z sinking to the bottom of the furnace during the melting and fining process. When glass flows slowly through a long channel of a hearth, a layer of glass containing a large amount of Z2 is deposited at the bottom of the channel.

This rich glass layer of Z-Illusion 2 has a higher liquidus temperature than normal glass. On the other hand, as the molten glass in the channel flows down into the bushing through the flow path, the temperature of the molten glass flowing close to the side walls defining the flow path gradually decreases as it flows down. Therefore, when the Zr02-rich glass layer flows close to the side wall defining the channel, devitrification occurs and crystals crystallize. The crystallized crystals flow into the bushing and cause the fibers to break in the paper yarn. The present invention has been made based on the above-mentioned discovery, and according to the present invention, a substantially horizontal channel for receiving molten glass, and a flow path formed in the bottom wall of the channel, through which the molten glass in the channel flows downward. , a method for preventing devitrification of molten glass in a glass fiber paper yarn device having a bushing that is attached in alignment with the flow path and spins molten glass flowing down the flow path; There is obtained a method characterized in that the molten glass flowing down the flow path is placed in a position adjacent to the side wall in the width direction of the channel. Further, according to the present invention, a substantially horizontal channel for receiving molten glass, a flow path formed in the bottom wall of the channel and through which the molten glass flows down, and a channel installed in alignment with the flow path, A device for preventing devitrification of molten glass in a glass fiber yarn device having a pushing device for spinning molten glass flowing down the flow path, a stirrer having blades attached to a rotating shaft;
and a drive device for rotationally driving the stirrer is installed such that the blades of the stirrer are located adjacent to a side wall in the width direction of the channel among the side walls defining the flow path. A device with characteristics is obtained.

o The rotation speed of the pestle device is preferably 5-3pm. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the entire glass fiber weaving apparatus, and this embodiment shows an example of a haze melting furnace which is electrically melted and refined.

In the figure, reference numeral 1 indicates a melting chamber, into which a glass batch 3 is charged by a charger 2, heated and melted by a molybdenum electrode 4, passes through a throat 5, passes through a riser 6, and reaches a channel 8 of a furhearth 7. . na 0
The melting chamber 1 is heated by the flame of a burner, or
It is also possible to use this flame in combination with electrical heating. The entire fur hearth 7 is made of a heat-resistant material such as refractory resin, and in addition to the above-mentioned substantially horizontal channel 8 that receives the molten glass 9, a bottom wall 101 of the channel 8 is formed, and a bottom wall 101 of the channel 8 is formed. It has a channel 11 through which the molten glass 9 flows down, and a pusher 012 which is attached in alignment with the channel 11 and which threads the molten glass flowing down the channel 11.

In the vicinity of the bushing 12, the bottom wall 10 of the furhearth 7 generally has a double structure of an upper layer flow block 13 and a lower layer bushing block 14. However, the flow block 13 can also be made thicker and have a single layer structure. The bushing 12 is electrically resistance heated to reheat the supplied molten glass and control the temperature. The molten glass 9 from the melting furnace 1 is heated by a heating element 2 such as silicon carbide.
The fluid slowly flows at a predetermined depth in the channel 8 while being thermally maintained and regulated by the flow path 1 defined by the side walls of the flow block 13 and the bushing block 14.
1, the paper is turned into paper threads at a bushing 12 and made into fibers. The furhearth 7 is also provided with a hawk ephemeris 15 which is a feature of the present invention in connection with the flow path 11.

In this embodiment, there are two flywheel devices in each channel 11. As shown in detail in FIG. 2, the fly stirrer 15 consists of a stirrer 18 having blades 17 attached to a rotating shaft 16, and a drive device, ie, a motor 19, for driving the stirrer 18 in rotation. The fly stirrer device 15 is installed such that the blades 17 of the stirrer 18 are located adjacent to the side wall 201 in the width direction of the channel 8 among the side walls defining the flow path 11 . The rotating shaft 16 of the stirrer 18 is a platinum pipe with the lower end closed, and the blades 17 can be a plurality of blades welded to the platinum pipe. The axis of rotation 16 of the stirrer 18 extends outside the channel 8 through an opening 22 in the top wall or ceiling brick 21 of the furnace, at which point a drive 19 is connected to the axis of rotation 16. . The drive device 19 is mounted on an underframe 23, and the underframe 23 is made of, for example, iron angle members assembled into a box shape, and its lower end is attached to the top wall 21 of the fur hearth 7 so as to straddle the top wall 21 of the fur hearth 7. It can be attached to a support fitting 24 fixed to the outer surface of the side wall.

Further, the stirrer 18 is connected to the driving device 19 through the opening 22 of the top wall 21.
Since it is necessary to take out the entire blade and replace it, the diameter of the Sekiguchi 22 is large enough to allow the blade 17 to come out.
For example, since there are eight ribs in diameter, it is preferable to cover the upper side of the opening 22 with a heat insulating material 26 in order to minimize heat dissipation from the entrance 22. The heat insulating material 25 can be made of, for example, heat-retaining bricks, alumina fibers, or ceramic fiber boards. It is preferable that the heat insulating material 25 is divided into two parts as shown in FIG. 3, and in this embodiment, the thickness of the heat insulating material 25 is 5 mm. The shape of the blades 17 of the stirrer 18 is preferably such that the tips of the blades are twisted downward, as shown in FIGS. 4 and 5, so that the effect of pushing the molten glass downward by rotation can be obtained.
To explain the operation of the Takaazusa apparatus 15, the molten glass 9 flows through the channel 8 while being thermally held and adjusted by the heating element 26, but in the process, the ZrQ component tends to sink to the bottom of the channel 8. According to the example, a glass layer A having a high concentration of Z2 of about 10% was formed over about 0.7 willow at the boundary with the bottom refractory.

This means that, for example, 2-S of Z containing 15% Zr02
In the case of i02-R'○-Na20-based alkali-resistant glass material, the content of 2 in Z in glass layer A is 16.
5%, and the liquidus temperature is 1200q of normal glass composition.
It means rising from o to 1260q0. In addition, in the bottom wall 10 of the channel 8, the top surface of the flow block 13 is at a relatively high temperature due to the high temperature molten glass flowing in contact with it, but the temperature increases in the cross-sectional direction from the flow block 13 to the bottom surface of the bushing block 14. There is a descent. Therefore, the temperature of the molten glass flowing close to the side wall 20 in the width direction of the channel 8 defining the flow path 11 is
It gradually decreases as the molten glass flows down. Therefore, when the molten glass of the glass layer A, whose liquidus temperature has increased and is more likely to crystallize as described above, flows down along the side wall 201, there is a risk of crystallization and devitrification in the process.
This danger can be avoided by installing the lamp device 15 having the blades 17 of the stirrer 18 at two adjacent sides of the side wall, as described above.
The problem can be almost completely eliminated by using molten glass as a rope. Looking at this effect in an example, the fiberization rate before installing the Azusa device was 65%,
Approximately 90% of the causes of cutting during fiberization were Z-2 crystal stones.

On the other hand, by the method of the present invention, when a fly cloth was attached and the stirrer was stirred at a ratio of 2 pm, the fiberization yield was significantly improved to 91%, and there was no generation of Zr02-based crystal stones. Note that it is not preferable that the height of the blade 17 attached adjacent to the side wall 20 is too high or too low. If the blades 17 of the stirrer 18 are located too low, for example below the bottom surface of the pushing block 14, this is undesirable as it disturbs the laminar flow of the molten glass that reaches the nozzle of the bushing tip. Furthermore, since the relatively high position of the flow block 13 is at a high temperature, there is little risk of crystallization. Also, if the distance B between the two side walls of the blades 17 of the stirrer 18 is too small, the butching flock 1
4 or the bricks of the flow block 13 are eroded and become lumpy, which can cause breakage during weaving.Also, allowance for the bending of the rotating shaft 16 of the stirrer 18 is required, so generally the distance B is from the 15 side to the 25 side. It is preferable that

Bushing block 14 and flow block 13 can be covered with platinum, in which case distance B can be made somewhat narrower. In addition, in the clothing layer 15, the starrer 1
The rotation speed of No. 8 is preferably 5 to 3 pm; if it is slower than &pm, there is no effect; on the other hand, if it is faster than 3 pm, the refractory will be severely eroded and bubbles will be formed, which will impede the fiberization efficiency. It turned out to be.

As is clear from the above, according to the present invention, the blades of the stirrer are positioned adjacent to the side wall in the width direction of the channel among the side walls defining the flow path from the channel to the pushing in a glass fiber grade yarn device. Since the molten glass, which is prone to crystallization, flows down close to the side wall, it can be prevented from crystallizing or devitrifying the molten glass. Without substantially changing the glass fiber yarn device used for paper yarn, devitrification is more likely to occur and glass can be easily spun.

[Brief explanation of the drawing]

FIG. 1 shows an overall schematic sectional view of a glass fiber paper thread device to which the method and device for preventing devitrification of molten glass of the present invention are applied, and FIG. 2 shows the flow path and the glass fiber paper thread device of FIG. FIG. 3 is an enlarged cross-sectional view of the pushing portion, showing details of the devitrification prevention device of the present invention; FIG. 3 is a cross-sectional view of the heat insulating material shown in FIG. 2; , Figure 4 is
FIG. 5 is a side view of the stirrer showing details of the blades of the stirrer of the hawk layer shown in FIG. 2, and FIG. 5 is a bottom view of the stirrer shown in FIG. 4. In the figure, code 8...channel, 9...
Molten glass, 10...Bottom wall of channel, 11
...Flow path, 12...Butssing, 1,
5...Tonazusa device, 16... Rotating shaft, 17...
...Feather, 18...Starla, 19...
...Drive device, 20...Side wall, 21...
・Top wall. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A substantially horizontal channel for receiving molten glass, a flow path formed on the bottom wall of the channel and through which the molten glass in the channel flows, and a channel installed in alignment with the flow path, In a method for preventing devitrification of molten glass in a glass fiber spinning apparatus having a bushing for spinning molten glass flowing down a channel, a position adjacent to a side wall in the width direction of the channel among the side walls defining the channel. A method characterized in that the molten glass flowing down the flow path is stirred. 2. A method for preventing devitrification of molten glass according to claim 1, wherein the molten glass is stirred by a rotary stirring device. 3. The method for preventing devitrification of molten glass according to claim 2, in which the molten glass is stirred by rotating the rotary stirring device at a rotation speed of 5 to 30 rpm. 4. A substantially horizontal channel for receiving molten glass, a channel formed on the bottom wall of the channel and through which the molten glass in the channel flows, and a channel installed in alignment with the channel and flowing down the channel. In a device for preventing devitrification of molten glass in a glass fiber spinning device having a bushing for spinning molten glass, a stirring device comprising a stirrer with blades attached to a rotating shaft and a drive device for rotationally driving the stirrer, An apparatus characterized in that the blades of the stirrer are installed so as to be located adjacent to a side wall in the width direction of the channel among the side walls defining the flow path. 5. In the method for preventing devitrification of molten glass according to claim 4, the rotating shaft of the stirrer extends through the top wall of the channel, and the driving device connects the rotating shaft to the outside of the channel. devices connected to. 6. The device for preventing devitrification of molten glass according to claim 4 or 5, wherein the blades of the stirrer are shaped to push down the molten glass.