JP5488863B2 - Glass fiber manufacturing apparatus and glass fiber manufacturing method - Google Patents

Description

  The present invention relates to an improvement in manufacturing technology of glass fibers having a flat cross-sectional shape.

  Glass fibers having a flat cross-sectional shape such as an oval or an ellipse can be used as a reinforcing material in a wide range of fields because they can achieve a high reinforcing effect when mixed and mixed with resin. Yes.

  This type of glass fiber draws molten glass downward from the nozzle holes of each nozzle in a state where a plurality of nozzles having flat nozzle holes are arranged on the bottom surface of a glass storage tank in which molten glass is stored. It is manufactured by cooling the drawn molten glass. In such a series of manufacturing processes, the purpose of cooling the molten glass drawn from the nozzle hole is to prevent the molten glass from being rounded by the surface tension. This is extremely important in producing a glass fiber having a cross-sectional shape.

  And as a cooling method utilized when manufacturing the glass fiber which has this kind of flat cross-sectional shape, for example, arranging a cooling plate (cooling fin) at intervals from the tip of the nozzle, What cools by blowing the gas induced | guided | derived with the said cooling plate to molten glass is known (for example, refer patent document 1).

JP 2003-48742 A

  By the way, in the case of producing a glass fiber having a flat cross-sectional shape, in order to obtain a sufficient reinforcing effect, the flatness (long diameter / short diameter) of the cross-sectional shape of the glass fiber is increased and such glass is used. It is important to produce the fibers efficiently.

  However, in the cooling method disclosed in Patent Document 1, since the cooling plate is disposed at a distance downward from the tip of the nozzle, the molten glass immediately after being drawn from the nozzle hole of the nozzle is formed by the cooling plate. It is difficult to receive a cooling effect. Therefore, the cooling efficiency of molten glass is bad. Thus, when the cooling efficiency of molten glass is bad, the molten glass pulled out from the nozzle hole is easily displaced in a direction in which the cross-sectional shape becomes circular due to surface tension. And the tendency which brings about the displacement of such a cross-sectional shape becomes large in the molten glass in a state with a still high temperature immediately after having pulled out from the nozzle hole. Therefore, as disclosed in Patent Document 1, in the cooling method in which the cooling plate is disposed at a distance from the tip of the nozzle, the glass fiber having a flat cross-sectional shape is efficiently manufactured. It becomes difficult. Such a problem becomes more prominent as an attempt is made to produce glass fibers having a large aspect ratio.

  This invention makes it a technical subject to efficiently manufacture the glass fiber which has flat cross-sectional shape by raising the cooling efficiency of the molten glass pulled out from the nozzle hole of a nozzle in view of the said situation.

  In order to solve the above problems, the glass fiber manufacturing apparatus according to the present invention includes a plurality of nozzles having flat nozzle holes arranged on the bottom surface of a glass storage tank in which molten glass is stored, and each of the nozzles In the glass fiber manufacturing apparatus for manufacturing glass fiber having a flat cross-sectional shape by cooling while pulling out the molten glass from the nozzle hole, the nozzle and the molten glass drawn from the nozzle hole of the nozzle And a cooling plate disposed so as to be opposed to each other with a gap therebetween, and the cooling plate induces gas to the gap to cool the molten glass. It is characterized by being configured to.

  According to such a configuration, the cooling plate faces both the nozzle and the molten glass with a gap in the vertical direction across both the nozzle and the molten glass drawn from the nozzle hole of the nozzle. It arrange | positions so that gas may be induced | guided | derived with respect to the clearance gap with a cooling plate, and a molten glass is cooled. Therefore, the part facing the cooling plate among the nozzle and the molten glass drawn out from the nozzle hole of the nozzle is continuously cooled by the gas induced by the cooling plate. As a result, the molten glass immediately after being drawn out from the nozzle hole of the nozzle included in the continuously cooled section can be immediately and efficiently cooled by the gas induced by the cooling plate. Therefore, the cooling efficiency of the molten glass drawn out from the nozzle hole of the nozzle is greatly improved, and it is possible to reliably suppress a situation in which the cross-sectional shape of the drawn molten glass is deformed round due to surface tension. That is, the molten glass drawn out from the flat nozzle hole is solidified without greatly changing its cross-sectional shape from the flat shape, and thus it is possible to efficiently produce glass fibers having a flat cross-sectional shape. It becomes.

  In addition, since the cooling efficiency of the molten glass drawn from the nozzle is greatly improved, the section where the molten glass drawn from the nozzle tends to be rounded by the surface tension (section where the cross-sectional shape of the molten glass is easily deformed) is short. As a result, it becomes difficult to produce a difference in the rounding of the molten glass in the process, and as a result, it is possible to suppress variation in the flat ratio of the cooled and solidified glass fiber.

  Said structure WHEREIN: It is preferable that the said cooling plate is arrange | positioned in parallel with the major axis direction of the nozzle hole of the said nozzle.

  In this way, the cooling area of the nozzle and the molten glass by the cooling plate can be secured wider than when the cooling pipe is arranged in parallel with the minor axis direction of the nozzle hole of the nozzle. It can be improved further.

  Said structure WHEREIN: The said cooling plate may be connected with the outer peripheral surface of the cooling pipe which distribute | circulates a cooling fluid inside.

  In this way, the cooling plate itself is cooled by the cooling pipe, so that the heat around the cooling plate can be absorbed more efficiently, and an airflow can be easily formed around the cooling plate. That is, compared with the case where the cooling pipe is not connected to the cooling plate, the gas can be more efficiently guided to the gap between the nozzle and the molten glass and the cooling plate facing both of them.

  In the above configuration, the nozzle has a notch formed by cutting off a part of the nozzle forming wall at a tip thereof, and the cooling plate is disposed so as to cover at least a part of the notch. It is preferable.

  That is, if a notch is provided at the tip of the nozzle, the molten glass is cooled by the atmosphere in the vicinity of the nozzle through the notch. And if a cooling plate is arrange | positioned so that at least one part of this notch part may be covered, the gas induced | guided | derived by a cooling plate will act on molten glass through a notch part. Therefore, the molten glass can be efficiently cooled early due to the synergistic effect of the notch and the gas induced by the cooling plate.

  The glass fiber manufacturing method according to the present invention, which was created to solve the above problems, includes arranging a plurality of nozzles having flat nozzle holes on the bottom surface of a glass storage tank in which molten glass is stored, and each of the nozzles In the glass fiber manufacturing method of manufacturing a glass fiber having a flat cross-sectional shape by cooling while pulling out the molten glass from the nozzle hole of the nozzle, the molten glass drawn from the nozzle hole of the nozzle, A cooling plate is disposed so as to face both of them with a gap between them, and a gas is guided to the gap by the cooling plate to cool the molten glass. It is characterized by.

  According to such a method, in a state where both the nozzle and the molten glass drawn out from the nozzle hole of the nozzle are straddled in the vertical direction, the nozzle and the molten glass are cooled so as to face each other with a gap. A plate is arranged, and in this state, a gas is induced to the gap by the cooling plate to cool the molten glass. Therefore, the part facing the cooling plate among the nozzle and the molten glass drawn out from the nozzle hole of the nozzle is continuously cooled by the gas induced by the cooling plate. As a result, the molten glass immediately after being drawn out from the nozzle hole of the nozzle included in the continuously cooled section can be immediately and efficiently cooled by the gas induced by the cooling plate. Therefore, the cooling efficiency of the molten glass drawn out from the nozzle hole of the nozzle is greatly improved, and it is possible to reliably suppress a situation in which the cross-sectional shape of the drawn molten glass is deformed round due to surface tension. That is, the molten glass drawn out from the flat nozzle hole is solidified without greatly changing its cross-sectional shape from the flat shape, and thus it is possible to efficiently produce glass fibers having a flat cross-sectional shape. It becomes.

  In addition, since the cooling efficiency of the molten glass drawn from the nozzle is greatly improved, the section where the molten glass drawn from the nozzle tends to be rounded by the surface tension (section where the cross-sectional shape of the molten glass is easily deformed) is short. As a result, it becomes difficult to produce a difference in the rounding of the molten glass in the process, and as a result, it is possible to suppress variation in the flat ratio of the cooled and solidified glass fiber.

  In the above method, it is preferable to produce a glass fiber having a cross-sectional flatness ratio (major axis / minor axis) of more than 1 and 30 or less.

  In other words, even if a flatness ratio exceeding 30 is realized, it is not possible to expect a reinforcing effect that is commensurate with it, but only various management items for maintaining the flatness ratio are unreasonably increased, which is economically preferable. Absent. Therefore, when considering both the reinforcing effect that can be expected of glass fiber and an economical viewpoint, the flatness ratio of the cross-sectional shape of the glass fiber is preferably more than 1 and 30 or less, and 2 or more and 25 or less. More preferably, it is more preferably 3 or more and 20 or less.

  As described above, according to the present invention, the melt drawn from the nozzle hole of the nozzle by the gas induced by the cooling plate disposed so as to straddle both the nozzle and the molten glass drawn from the nozzle hole of the nozzle. Since the glass is efficiently cooled, it is possible to efficiently produce glass fibers having a flat cross-sectional shape.

It is a longitudinal cross-sectional view which shows the arrangement | positioning relationship between the nozzle and cooling plate directly under a bushing of the glass fiber manufacturing apparatus which concerns on one Embodiment of this invention. It is a cross-sectional view which shows the arrangement | positioning relationship of the nozzle and cooling plate just under a bushing of the glass fiber manufacturing apparatus shown in FIG. (A)-(D) are longitudinal cross-sectional views which show the modification of the cooling plate used for this embodiment. (A)-(C) are perspective views which show the modification of the nozzle used for this embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view showing the positional relationship between a nozzle and a cooling plate immediately below the bushing of the glass fiber manufacturing apparatus according to this embodiment, and FIG. 2 is a horizontal cross section showing the positional relationship between the nozzle and the cooling plate immediately below the bushing. FIG. As shown in these drawings, this glass fiber manufacturing apparatus manufactures (spins) glass fibers having a flat cross-sectional shape from a molten glass 1 having a glass composition such as E glass, D glass, AR glass or the like. For this purpose, a glass melting furnace is provided outside the figure. The molten glass 1 melted in the glass melting furnace flows into a glass storage tank disposed on the downstream side of the glass melting furnace. This glass storage tank is energized and heated, and is managed so as to be in an optimum temperature condition (for example, within a range of 1100 to 1300 ° C.). The bushing 2 constituting the bottom surface of this glass storage tank has a plurality of The nozzles 3 are arranged in an aligned state.

  The nozzle 3 has a flat nozzle hole 3a, and has a notch 3b formed by cutting a part of the nozzle forming wall at the tip. The nozzle 3 is arranged so that the major axis of the nozzle hole 3 a is parallel to the lateral direction (long side direction) of the bushing 2. In this state, the nozzles 3 adjacent to each other in the longitudinal direction (short side direction) of the bushing 2 are arranged so that the sides where the notches 3b are formed every two rows face each other.

  In the illustrated example, the notch 3b is formed over a region of one third of the entire circumference of the nozzle hole 3a of the nozzle 3. The upper limit of the vertical dimension (depth) L1 of the notch 3b is preferably less than or equal to ½ of the vertical dimension (full length) L2 of the nozzle 3, and the lower limit of the vertical dimension L1 of the notch 3b is The diameter of the nozzle hole 3a of the nozzle 3 is preferably ½ or more of the equivalent circle diameter (referred to as the diameter of a circle having the same area as the cross-sectional area of the nozzle hole 3a; hereinafter the same). The reason for defining the vertical dimension L1 of the notch 3b in this way is as follows. That is, when the vertical dimension L1 of the notch 3b exceeds 1/2 of the vertical dimension L2 of the nozzle 3, the strength of the nozzle 3 is lowered, and there is a risk of deformation when used for a long time. . On the other hand, if the vertical dimension L1 of the notch 3b is less than half the equivalent circle diameter of the cross-sectional area of the nozzle hole 3a, the cooling effect of the molten glass 1 by the notch 3b may not be expected sufficiently. There is. Therefore, it is preferable that the upper limit value and the lower limit value of the vertical dimension L1 of the notch 3b are the above numerical values.

  Cooling plates 4 and 5 are arranged between the nozzles 3 adjacent to each other in the longitudinal direction of the bushing 2 so as to be parallel to the lateral direction of the bushing 2. That is, the cooling plates 4 and 5 are arranged in parallel with the major axis direction of the nozzle hole 3 a of the nozzle 3. In this state, the cooling plates 4 and 5 are placed on both the nozzle 3 and the molten glass 1 in a state of straddling both the nozzle 3 and the molten glass 1 drawn from the nozzle hole 3a in the vertical direction. They are arranged to face each other with a gap. Since the gas (atmosphere) is induced in the gap by the cooling plates 4 and 5, the molten glass 1 is cooled by the gas induced in the gap.

  As shown in FIG. 1, the cross-sectional shape of the cooling plates 4 and 5 has an oval shape (track shape) that is long in the vertical direction. And the dimension in the longitudinal cross-section of the cooling plates 4 and 5 is set to 5-50 mm in the vertical (height) dimension L3, and 0.5-5 mm in the horizontal (thickness) dimension. The reason for setting such dimensions is as follows. That is, when the vertical dimension and the horizontal dimension in the longitudinal section of the cooling plates 4 and 5 become too large, the cooling plates 4 and 5 become in the way and are connected to the molten glass 1 drawn from the nozzle holes 3a of the respective nozzles 3. There are restrictions on the place where the spinning process (spinning process) for spinning a plurality of cooled and solidified glass fibers can be performed. On the other hand, if the vertical dimension and the horizontal dimension in the longitudinal section of the cooling plates 4 and 5 are too small, the cooling efficiency by the cooling plates 4 and 5 is lowered. Therefore, it is preferable to set the vertical dimension and the horizontal dimension in the longitudinal section of the cooling plates 4 and 5 within the above numerical range. Of the vertical dimension L3 of the cooling plates 4 and 5, the dimension L4 of the part facing the nozzle 3 and the dimension L5 of the part facing the molten glass 1 drawn from the nozzle hole 3a of the nozzle 3 are shown. May be the same as in the illustrated example, or one of the vertical dimensions L4 (L5) may be longer than the other vertical dimension L5 (L4). Good. The cooling plates 4 and 5 may be solid, but from the viewpoint of weight reduction, the entire interior may be hollow, or the interior may be partially formed of a porous material.

  The cooling plates 4 and 5 are disposed on both sides of the nozzle 3. Among these, the cooling plate 4 arrange | positioned at the side in which the notch part 3b of the nozzle 3 is formed is arrange | positioned so that at least one part of the notch part 3b may be covered from a side. In the present embodiment, the cooling plates 4 and 5 are arranged on both sides of the nozzle 3, but the cooling plate 4 (5) may be arranged only on either one side. In this case, it is preferable to arrange the cooling plate 4 only on the side where the notch 3b of the nozzle 3 is formed.

  Further, as shown in FIG. 2, one end of the cooling plates 4 and 5 in the longitudinal direction is connected to the outer peripheral surface of a cooling pipe 7 through which a cooling liquid 6 such as water flows. In this way, since the cooling plates 4 and 5 themselves are cooled by the cooling pipe 7, the heat around the cooling plate 4 is absorbed more efficiently, and an airflow is easily formed around the cooling plates 4 and 5. Become. That is, in comparison with the case where the cooling pipe 7 is not connected to the cooling plates 4 and 5, the gas is more efficiently guided to the gap between the nozzle 3 and the molten glass 1 and the cooling plates 4 and 5 facing both of them. can do. Moreover, since the temperature of the cooling plates 4 and 5 can be easily managed, it is possible to reliably prevent a situation in which the cooling efficiency varies among the cooling plates 4 and 5. Instead of connecting the cooling pipe 7 to the end of the cooling plates 4 and 5, the cooling pipe 7 is arranged on the upper end side or the lower end side of the cooling plates 4 and 5 in parallel with the longitudinal direction of the cooling plates 4 and 5. The cooling pipe 7 may be connected to the upper end side or the lower end side of the cooling plate 4.

  Next, a method for producing a glass fiber having a flat cross-sectional shape by the glass fiber production apparatus according to the present embodiment configured as described above will be specifically described below.

  First, in the raw material preparation step, a plurality of glass raw materials are weighed so as to have an E glass composition, for example, and then the weighed glass raw materials are mixed by a batch mixer to form a mixed batch raw material. Next, the obtained mixed batch raw material is charged into a silo, and the mixed batch raw material is continuously charged from a silo into a melting chamber of a glass melting furnace by a raw material charging machine such as a screw charger. At this time, the glass cullet is put into the melting chamber of the glass melting furnace together with the mixed batch raw material as necessary.

  The glass raw material thrown into the melting chamber is rapidly heated by a heat source of electric heating, a high-temperature gas or radiant heat in the melting chamber, etc., to cause a high-temperature chemical reaction to be in a roughly molten state. Then, the reaction further proceeds with time, and after the initial reaction gas and the like are released, the homogeneous molten glass 1 is obtained. And the homogenized molten glass 1 flows into a feeder through the forehearth of a glass melting furnace.

  And the molten glass 1 which flowed into the glass storage tank installed in the feeder front-end | tip is the nozzle hole of each nozzle 3 arranged in the bushing 2 which comprises the bottom face of a glass storage tank, as shown in FIG.1 and FIG.2. It is continuously drawn downward from 3a. At this time, the cooling plates 4 and 5 have a gap between both the nozzle 3 and the molten glass 1 in a state of straddling both the nozzle 3 and the molten glass 1 drawn from the nozzle hole 3a along the vertical direction. Since the cooling plates 4 and 5 are disposed so as to face each other, the gas is induced into the gap by the cooling plates 4 and 5 to cool the molten glass 1. If it does in this way, the part (part corresponding to L3 shown in FIG. 1) which opposes the cooling plates 4 and 5 between the nozzle 3 and the molten glass 1 pulled out from the nozzle hole 3a will be shown. , Continuously cooled by the gas induced by the cooling plates 4, 5. As a result, the molten glass 1 immediately after being drawn out from the nozzle hole 3a included in the continuously cooled section can be immediately and efficiently cooled by the gas induced by the cooling plates 4 and 5. Become. Therefore, the cooling efficiency of the molten glass 1 drawn out from the nozzle hole 3a is greatly improved, and the cross-sectional shape of the molten glass 1 drawn out from the nozzle hole 3a is reliably suppressed from being rounded by surface tension. Can do. That is, since the molten glass 1 drawn out from the flat nozzle hole 3a is solidified without greatly changing its cross-sectional shape from the flat shape, it is possible to efficiently produce glass fibers having a flat cross-sectional shape. Is possible.

  Furthermore, a notch 3b is formed at the tip of the nozzle 3, and a cooling plate 4 is disposed so as to cover the notch 3b from the side. Therefore, the molten glass 1 is cooled by the atmosphere (gas) in the vicinity of the nozzle 3 through the notch 3b. Moreover, the gas induced | guided | derived by the cooling plate 4 acts on the molten glass 1 through the notch part 3b. Therefore, the molten glass 1 can be efficiently cooled early due to the synergistic effect of the notch 3 b and the cooling plate 4.

  In this embodiment, since the cooling plates 4 and 5 are arranged on both sides of the nozzle 3, the molten glass 1 immediately after being drawn from the nozzle hole 3 a of the nozzle 3 is guided by the cooling plates 4 and 5. The gas is cooled from both sides at once. Therefore, compared with the case where the cooling plate 4 (5) is disposed only on one side of the nozzle 3, the cooling efficiency of the molten glass 1 can be improved.

  In such a cooling process of the molten glass 1, the nozzle 3 itself is also cooled by the gas induced by the gap by the cooling plate 4, so that it is possible to suppress the aged deterioration of the nozzle 3 due to heat.

  And the sizing agent is applied to the surface of the glass fiber obtained from the molten glass 1 thus cooled by an applicator or the like, and 3000 to 10000 are spun into one strand ( Spinning process). Thereafter, the spun strand is wound up as a cake, and is cut into a predetermined length of, for example, about 1 to 20 mm as necessary, and used as a glass chopped strand. The flatness ratio of the cross-sectional shape of the glass fiber (monofilament) constituting the glass chopped strand can be set to more than 1 and 30 or less. In practical terms, the flatness ratio of the cross-sectional shape of the glass fiber is preferably 2 or more and 25 or less.

  In addition, glass chopped strands made of glass fibers having a flat cross-sectional shape manufactured in this way are combined with resin materials, etc., and when molding composite materials by extrusion molding, excellent molding dimensions with less distortion after molding It is possible to obtain a molded body that can achieve accuracy.

  In addition, this invention is not limited to said embodiment, It can implement with a various form. For example, in the above-described embodiment, the case where the longitudinal cross-sectional shape of the cooling plates 4 and 5 has an oval shape that is elongated in the vertical direction has been described, but various shapes can be employed. Specifically, the vertical cross-sectional shape of the cooling plates 4 and 5 is a rectangular shape as shown in FIG. 3A, a wedge shape that gradually narrows downward as shown in FIG. ) Or a substantially rectangular shape with a plurality of irregularities formed on the surface as shown in FIG. As shown in FIG. 4D, if a plurality of irregularities are formed on the surface, the surface area increases, so that the heat absorption efficiency of the surrounding heat by the cooling plates 4 and 5 is improved. Therefore, an air flow is easily formed by the cooling plate 4, and the gas can be more efficiently guided into the gap. Such an effect is not limited to the case where the longitudinal cross-sectional shape of the cooling plates 4 and 5 is substantially rectangular, but is similarly enjoyed when the cooling plates 4 and 5 have various shapes. can do. Further, the unevenness formed on the surfaces of the cooling plates 4 and 5 may be dimples, wavy meandering patterns, etc. in addition to the stepped shape as shown.

  In the above-described embodiment, the case where one notch 3b of the nozzle 3 is formed in one-third of the entire circumference of the nozzle hole 3a has been described. However, the present invention is not limited to this. Specifically, for example, one notch portion 3b of the nozzle 3 may be formed in a half region of the entire circumference of the nozzle hole 3a as shown in FIG. 4A, or the nozzle hole 3a. One may be formed over a region of ½ or more of the entire circumference. Further, as shown in FIG. 5B, the notch 3b may be provided on each of the two opposing long sides of the nozzle hole 3a. Furthermore, as shown in FIG. 5C, a plurality of (three in the figure) cutouts 3b on the long side of one side of the nozzle hole 3a may be provided.

  Further, in the above-described embodiment, the case where the notch 3b is formed by cutting out the region including the tip of the nozzle 3 so that a part of the tip of the nozzle 3 is discontinuous in the circumferential direction by the notch 3b. However, the region excluding the tip of the nozzle 3 may be cut out to form the notch 3b so that the tip of the nozzle 3 is continuous in the circumferential direction. That is, only the nozzle forming wall excluding the tip of the nozzle 3 may be cut into, for example, an oval shape to form the notch 3b. In this case, the distance from the tip of the nozzle 3 to the lower end of the notch 3b (the end of the notch 3b on the nozzle tip side) is set to be not more than five times the equivalent circle diameter of the nozzle hole 3a. Is preferred. This is because when the distance exceeds a dimension equivalent to five times the equivalent circle diameter of the nozzle hole 3a, the molten glass 1 oozes out from the cutout portion 3b and the surroundings are wet with the molten glass, which may impede production. .

  In the above embodiment, the cooling plates 4 and 5 have been described in the case where they are arranged in parallel with the horizontal direction (long side direction) of the bushing 2 and in parallel with the vertical direction (short side direction) of the bushing 2. You may arrange | position in parallel with the horizontal direction of the bushing 2 in parallel with the vertical direction of the bushing 2. As shown in FIG. That is, the cooling plates 4 and 5 may be arranged in parallel with the minor axis direction of the nozzle hole 3 a of the nozzle 3.

  Furthermore, although said embodiment demonstrated the case where the manufactured glass fiber was utilized as a chopped strand, it is not limited to this, It can utilize as various glass fiber products. Specific examples include yarn, roving, DWR (direct winding roving), milled fiber, cloth (woven fabric), mat, tape, and braid other than chopped strands.

DESCRIPTION OF SYMBOLS 1 Molten glass 2 Bushing 3 Nozzle 3a Nozzle hole 3b Notch 4, 5 Cooling plate 6 Coolant 7 Cooling pipe

Claims (6)

On the bottom of the glass reservoir in which the molten glass is reservoir, a nozzle for have a notch on one long side side wall portions of the organic and and tip the flat nozzle hole is more sequences, each of the nozzle holes of the nozzle In the glass fiber manufacturing apparatus for manufacturing glass fiber having a flat cross-sectional shape by cooling while pulling out the molten glass from
And the notch portion of the nozzle, in a state where both the spanning vertically between the molten glass drawn out from the nozzle holes of the nozzle, a cooling plate disposed to face with a gap on both,
The glass plate manufacturing apparatus, wherein the cooling plate is configured to cool the molten glass by inducing gas to the gap.   The glass fiber manufacturing apparatus of Claim 1 with which the said cooling plate is arrange | positioned in parallel with the major axis direction of the nozzle hole of the said nozzle.   The glass fiber manufacturing apparatus of Claim 1 or 2 with which the said cooling plate is connected with the outer peripheral surface of the cooling pipe which distribute | circulates a cooling fluid inside. In a state of straddling the other long side wall portion without the notch portion of the nozzle and the molten glass drawn out from the nozzle hole of the nozzle in the vertical direction so as to face both with a gap. The glass fiber manufacturing apparatus of any one of Claims 1-3 further provided with the arrange | positioned cooling plate. On the bottom of the glass reservoir in which the molten glass is reservoir, a nozzle for have a notch in the side wall portion of one long side of the perforated to and tip the flat nozzle hole is more sequences, each of said nozzles In the glass fiber production method for producing glass fibers having a flat cross-sectional shape by cooling while pulling out the molten glass from the nozzle holes,
In a state straddling both the notch portion of the nozzle and the molten glass drawn out from the nozzle hole of the nozzle in the vertical direction, a cooling plate is disposed so as to face both with a gap,
A glass fiber manufacturing method, wherein the molten glass is cooled by inducing gas to the gap by the cooling plate.   The glass fiber manufacturing method according to claim 5, wherein the glass fiber is manufactured so that a flatness ratio of a cross-sectional shape is more than 1 and 30 or less.

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