TWI741824B - Glass fiber aggregate - Google Patents

Abstract

The glass fiber assembly of the present invention is a glass fiber assembly composed of a plurality of glass fibers. The glass fibers have a special-shaped cross section with a flat cross section. The average aspect ratio is divided by the aspect ratio of the glass fiber cross section. The value (percentage) after the mean value σ is 2.9% or less.

Description

Glass fiber aggregate

The present invention relates to the improvement of glass fiber aggregates.

Special-shaped glass fibers with non-circular cross-sections such as oblong or elliptical flat cross-sections can achieve high strengthening effects when they are mixed with resin and composited, and are used in various fields.

This kind of special-shaped cross-section glass fiber is generally manufactured by pulling molten glass from a nozzle and cooling it. At this time, when the cross-sectional shape of the glass fiber based on the shape of the nozzle hole at the tip of the nozzle is formed to produce the shaped cross-section glass fiber, the nozzle hole is often formed into a flat shape at the tip of the nozzle.

However, if a nozzle with a flat nozzle hole is used, if the viscosity of the molten glass drawn from the nozzle is too low, the surface tension will easily form a circular cross section of the molten glass just below the tip of the nozzle. Shaped cross-section glass fiber.

Here, for example, the nozzles disclosed in Figures 18 to 20 of Patent Document 1 have a pair of long wall portions facing each other in the short-diameter direction of the flat nozzle hole at the tip of the nozzle where the molten glass flows out. The notch part of the concave-shaped notch part cools and adjusts the viscosity of the molten glass.

[Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent No. 3369674

However, the notch portion disclosed in Figures 18 to 20 of Patent Document 1 is a rectangular shape with the opening width on the base end side (inflow side of molten glass) and the opening width on the tip side (outflow side of molten glass) substantially the same. . Therefore, the strength of the tip of the nozzle where the notch is provided will inevitably become weaker. Especially in order to provide a large opening area of the rectangular notch, when a rectangular notch is provided in substantially the entire area of the long wall, the remaining part of the nozzle tip except for the notch is essentially only on the long-diameter side of the nozzle hole. As a result, the strength of the tip of the nozzle is further reduced significantly.

However, since the high-temperature molten glass flows inside the nozzle and the surrounding temperature is increased, if the strength of the nozzle tip portion is low, the short wall portion may become wider toward the outside, and thermal deformation may occur. At this time, the shape of the nozzle hole at the tip of the nozzle is deformed, which increases the unevenness of the shape of the molded glass fiber, and it becomes difficult to form it stably.

In view of the above situation, the present invention aims to stabilize the molding of glass fibers with irregular cross-sections while suppressing the thermal deformation of the nozzle and appropriately adjusting the viscosity of the molten glass during molding.

The glass fiber assembly of the present invention developed to solve the above-mentioned problems is a glass fiber assembly composed of a plurality of glass fibers. The glass fibers have a special-shaped cross-section with a flat cross-section, and are characterized by: the average flatness ratio The value (percentage) obtained by dividing the value by the unevenness σ of the aspect ratio of the cross section of the glass fiber is 2.9% or less.

In the above configuration, the aspect ratio of the cross section is preferably 1.5-20.

According to the above-mentioned present invention, while suppressing the thermal deformation of the nozzle and appropriately adjusting the viscosity of the molten glass during molding, stable molding of glass fibers with irregular cross-sections can be performed.

1: Glass melting furnace

2: Forehearth

3: Feeding trough

4: bushing

5: Nozzle

51: Long Wall

52: Short wall

53: Nozzle hole

54: Notch

6: Cooling pipe

7: bobbin

G: Molten glass

Gm: glass fiber

Gs: tow

Gr: Fiber bundle

W: The opening width of the notch

F: cooling water

Fig. 1 is a cross-sectional view showing an apparatus for producing a glass fiber with a deformed cross section according to an embodiment of the present invention.

Fig. 2 is an enlarged cross-sectional view showing the periphery of the nozzle in Fig. 1.

Fig. 3 is an enlarged bottom view showing the periphery of the nozzle of Fig. 1.

Fig. 4A is a side view showing the nozzle of the first embodiment of the present invention.

Fig. 4B is a cross-sectional view of A1-A1 in Fig. 4A.

Figure 4C is a B1-B1 cross-sectional view of Figure 4A.

Fig. 4D is a cross-sectional view of C1-C1 in Fig. 4A.

Fig. 5A is a side view showing a nozzle for manufacturing a special-shaped cross-section glass fiber according to a second embodiment of the present invention.

Fig. 5B is a cross-sectional view of A2-A2 in Fig. 5A.

Figure 5C is a B2-B2 cross-sectional view of Figure 5A.

Figure 5D is a C2-C2 cross-sectional view of Figure 5A.

Fig. 6A is a side view showing the nozzle of the third embodiment of the present invention.

Fig. 6B is a cross-sectional view of A3-A3 in Fig. 6A.

Fig. 6C is a cross-sectional view of B3-B3 in Fig. 6A.

Figure 6D is a C3-C3 cross-sectional view of Figure 6A.

Fig. 7A is a side view showing the nozzle of the fourth embodiment of the present invention.

Fig. 7B is a cross-sectional view of A4-A4 in Fig. 7A.

Fig. 7C is a cross-sectional view of B4-B4 in Fig. 7A.

Figure 7D is a C4-C4 cross-sectional view of Figure 7A.

Fig. 8A is a side view showing the nozzle of the fifth embodiment of the present invention.

Fig. 8B is a cross-sectional view of A5-A5 in Fig. 8A.

Fig. 8C is a cross-sectional view of B5-B5 in Fig. 8A.

Fig. 8D is a cross-sectional view of C5-C5 in Fig. 8A.

Fig. 9A is a side view showing the nozzle of the sixth embodiment of the present invention.

Figure 9B is the A6-A6 cross-sectional view of Figure 9A.

Figure 9C is a B6-B6 cross-sectional view of Figure 9A.

Fig. 9D is a cross-sectional view of C6-C6 in Fig. 9A.

Fig. 10A is a side view showing the nozzle of the seventh embodiment of the present invention.

Fig. 10B is a cross-sectional view of A7-A7 in Fig. 10A.

Fig. 10C is a cross-sectional view of B7-B7 in Fig. 10A.

Fig. 10D is a cross-sectional view of C7-C7 in Fig. 10A.

Fig. 11A is a side view showing the nozzle of the eighth embodiment of the present invention.

Fig. 11B is a cross-sectional view of A8-A8 of Fig. 11A.

Fig. 11C is a cross-sectional view of B8-B8 in Fig. 11A.

Figure 11D is a C8-C8 cross-sectional view of Figure 11A.

Fig. 12A is a side view showing the nozzle of the ninth embodiment of the present invention.

Figure 12B is a cross-sectional view of A9-A9 of Figure 12A.

Figure 12C is a B9-B9 cross-sectional view of Figure 12A.

Figure 12D is a C9-C9 cross-sectional view of Figure 12A.

Fig. 13A is a side view showing a nozzle for producing a glass fiber with a deformed cross section according to a tenth embodiment of the present invention.

Fig. 13B is a cross-sectional view of A10-A10 in Fig. 13A.

Fig. 13C is a cross-sectional view of B10-B10 in Fig. 13A.

Figure 13D is a C10-C10 cross-sectional view of Figure 13A.

Fig. 14A is a side view showing a nozzle for manufacturing a special-shaped cross-section glass fiber according to an eleventh embodiment of the present invention.

Fig. 14B is a cross-sectional view of A11-A11 in Fig. 14A.

Figure 14C is a B11-B11 cross-sectional view of Figure 14A.

Fig. 14D is a cross-sectional view taken along line C11-C11 in Fig. 14A.

Fig. 15A is a side view showing a nozzle for manufacturing a special-shaped cross-section glass fiber according to a twelfth embodiment of the present invention.

Fig. 15B is a cross-sectional view of A12-A12 in Fig. 15A.

Fig. 15C is a cross-sectional view of B12-B12 of Fig. 15A.

Figure 15D is a C12-C12 cross-sectional view of Figure 15A.

Fig. 16A is a cross-sectional view schematically showing an example of a glass fiber having a special-shaped cross-section.

Fig. 16B is a cross-sectional view schematically showing an example of a glass fiber having a special-shaped cross-section.

FIG. 17A is a side view showing the nozzle of Comparative Example 1. FIG.

Fig. 17B is a cross-sectional view of A13-A13 in Fig. 17A.

Fig. 17C is a cross-sectional view of B13-B13 in Fig. 17A.

Figure 17D is a C13-C13 cross-sectional view of Figure 17A.

FIG. 18A is a side view showing the nozzle of Comparative Example 2. FIG.

Fig. 18B is a cross-sectional view of A14-A14 in Fig. 18A.

Hereinafter, the embodiments of the present invention will be explained based on the attached drawings.

(One embodiment of manufacturing device and manufacturing method for special-shaped cross-section glass fiber)

As shown in FIG. 1, the manufacturing apparatus of the shaped cross-section glass fiber of the present embodiment includes a glass melting furnace 1; a forehearth 2 connected to the glass melting furnace 1; and a feeding trough 3 connected to the forehearth 2. Here, in the orthogonal coordinate system composed of XYZ shown in Fig. 1, the X direction and the Y direction are horizontal directions, and the Z direction is the vertical direction (hereinafter, the same).

The molten glass G is supplied to the feed tank 3 from the glass melting furnace 1 through the forehearth 2 and is stored in the feed tank 3. Although FIG. 1 shows one feed tank 3, the glass melting furnace 1 may be connected to a plurality of feed tanks 3.

In this embodiment, molten glass G is made of E glass, but it may be other glass materials such as D glass, S glass, AR glass, and C glass.

The bottom of the feeding trough 3 is formed by a bushing 4. The bush 4 is attached to the feed tank 3 through a bush block or the like. A plurality of nozzles 5 are provided at the bottom of the bush 4. A cooling pipe 6 as a cooling means is provided in the vicinity of each nozzle 5.

The molten glass G stored in the feed tank 3 from the plurality of nozzles 5 provided in the bush 4 is pulled downward to produce glass fiber (monofilament) Gm. At this time, the viscosity of the molten glass G at the forming temperature is set in the range of 10 ^2.0 to 10 ^3.5 dPa•s (preferably 10 ^2.5 to 10 ^3.3 dPa•s). In addition, the viscosity of the molten glass Gm at the molding temperature is the viscosity of the molten glass G flowing into the nozzle 5. The surface of the glass fiber G is coated with a collector by an applicator not shown, and 100 to 10,000 are spun into a tow Gs. The tow Gs after spinning is wound on the bobbin 7 of the winding device as the fiber bundle Gr. The tow Gs is cut into a predetermined length of about 1 to 20 mm, for example, and used as a cut glass strand.

The glass melting furnace 1, the forehearth 2, the feeding trough 3, the liner 4, the nozzle 5 and the cooling pipe 6 are at least partially formed of platinum or platinum alloy (for example, platinum rhodium alloy).

In order to adjust the viscosity of the molten glass G, it is also possible to select one or a plurality of elements from the forehearth 2, the feeding trough 3, and the liner 4 to be heated by electric heating or the like.

As shown in Figures 2 and 3, the nozzle 5 is at the tip (lower part), and is provided with a pair of long wall portions (first wall portions) 51 facing each other in the X direction; a pair facing each other in the Y direction Short wall portion (second wall portion) 52; and a flat nozzle hole 53 formed by dividing the long wall portion 51 and the short wall portion 52. Each long wall portion 51 is provided with a notch 54, and a part of the nozzle hole 53 communicates with the outer space of the nozzle 5 through the notch 54. In this embodiment, the long-diameter direction of the nozzle hole 53 coincides with the Y direction, and the short-diameter direction of the nozzle hole 53 coincides with the X direction. In addition, in this embodiment, the X-direction dimension of the short wall portion 52 is shorter than the Y-direction dimension of the long wall portion 51. Of course, the relationship between the dimensions of the wall portions 51 and 52 is not particularly limited.

The cooling pipe 6 uses fluid cooling water F to circulate inside it to achieve a cooling effect. The cooling pipe 6 is a plate-shaped body, and is arranged so that the plate surface is along the up-down direction. In addition, although the cooling pipe 6 is integrally provided at the bottom of the bushing 4 in this embodiment, it may be provided separately from the bottom of the bushing 4. In addition, the cooling pipe 6 may be a circular tubular body. The height position of the cooling cylinder 6 can be appropriately adjusted according to the cooling conditions of the molten glass G. For example, the cooling pipe 6 can also be It is arranged above the tip of the nozzle 5 so as not to directly face the molten glass G drawn from the nozzle 5, and it may be arranged across both the nozzle 5 and the molten glass G drawn from the nozzle 5. The cooling means is not limited to the cooling pipe 6, as long as it is a cooling wing or the like that can induce air flow to achieve a cooling effect. The components that are not necessary for the cooling means can also be omitted.

In this embodiment, as shown in FIG. 3, at the bottom of the bushing 4, a plurality of nozzle rows L are arranged in parallel at intervals in the X direction. Each nozzle row L is configured by arranging a plurality of nozzles 5 with the longitudinal direction of the nozzle hole 53 in the Y direction on the same straight line extending in the Y direction. The cooling pipe 6 is arranged between the nozzle rows L adjacent to the X direction in parallel with the nozzle rows L. Thereby, the cooling pipe 6 faces the notch 54 of the nozzle 5, and the molten glass G circulating in the nozzle 5 is cooled by the notch 54. Specifically, in the tip portion of the nozzle 5, the molten glass G is rapidly cooled by the cooling pipe 6 from a temperature of 1000° C. or higher. In addition, the cooling pipe 6 also has a cooling bush 4 or a nozzle 5, which suppresses such thermal deterioration and improves durability.

(The first embodiment of the nozzle)

As shown in FIGS. 4A to 4D, the notch portion 54 provided in each long wall portion 51 of the nozzle 5 gradually expands the opening width W in the Y direction toward the front end side. In this embodiment, the notch portions 54 and 54 provided in the respective long wall portions 51 and 51 are triangles of the same size, and the long wall portion 51 is formed only at the central portion except for both ends in the Y direction. In detail, the notch portion 54 has a vertex T1 on the center line M1 of the long wall portion 51, and is opposed to It is a symmetrical two equilateral triangles (including equilateral triangles) on the center line M1. The apex angle θ1 is, for example, 40 to 150° (preferably 60 to 120°). In addition, in this embodiment, the nozzle hole 53 is a flat oval (or ellipse) and has a constant shape in the Z direction. As shown in Figure 4D, in the tip portion of the nozzle 5, the nozzle hole 53 has a ratio (a/b) of 1.5 to 20 ( Preferably it is the range of 3-10).

According to the above configuration, it is possible to suppress the deformation of the shape of the notch 54 caused by the nozzle 5, and it is also possible to sufficiently ensure the opening area of the notch 54. Therefore, the glass fiber Gm having a non-circular cross section such as a flat shape or the like can be formed stably. In other words, the unevenness of the cross-sectional shape of the manufactured glass fiber Gm becomes smaller.

When the nozzle 5 has a flat nozzle hole 53 separated by a long wall 51 and a short wall 52 at the tip, the shape of the base end (upper part) may be the same as or different from the shape of the tip.

The shape of the notch 54 of the nozzle 5 can be variously deformed. Hereinafter, a modification example thereof will be described.

(The second embodiment of the nozzle)

As shown in Figures 5A to 5D, the notches 54 and 54 provided in the respective long wall portions 51 and 51 are triangles of the same size, and the base end side of the long wall portion 51 may also be formed in a partial area in the Y direction , And the front end side of the long wall portion 51 is formed in the entire area in the Y direction. In detail, in this embodiment, the notch 54 has an apex on the center line M2 of the long wall 51 T2 is a symmetrical two equilateral triangle with respect to the center line M2. The apex angle θ2 is, for example, 90 to 165° (preferably 100 to 150°). In addition, in this embodiment, the nozzle hole 53 has a flat oblong shape and has a constant shape in the Z direction.

(The third embodiment of the nozzle)

As shown in Figs. 6A to 6D, the notches 54 and 54 provided in the respective long wall portions 51, 51 are arcuates of the same size, and may be formed only at both ends of the long wall portion 51 except for the Y-direction. The central part. In detail, in this embodiment, the notch 54 has an apex T3 on the center line M3 of the long wall part 51, and is a semicircular symmetrical with respect to the center line M3 (the length of the chord becomes an arcuate shape with a diameter). The radius of curvature R3 is, for example, less than 0.5 to 5 mm (preferably 2 to 4 mm). In addition, the notch portion 54 may have an arcuate shape with a chord length smaller than the diameter of the circle, or a concave curve that is not an arc. In addition, in this embodiment, the nozzle hole 53 has a flat oblong shape and has a constant shape in the Z direction.

(The fourth embodiment of the nozzle)

As shown in Figs. 7A to 7D, the notches 54 and 54 provided in the respective long wall portions 51 and 51 are arcuates of the same size, and the base end side of the long wall portion 51 may be formed in a partial area in the Y direction. , And the front end side of the long wall portion 51 is formed in the entire area in the Y direction. In detail, in this embodiment, the notch 54 has a vertex T4 on the centerline M4 of the long wall portion 51, and is symmetrical with respect to the centerline M4, and the chord length is smaller than the diameter of the circle. shape. The radius of curvature R4 is, for example, 5-20 mm (preferably 5-10 mm). In addition, the notch portion 54 may be a semicircular shape or a concave curve other than an arc. In addition, in this embodiment, the nozzle hole 53 has a flat oblong shape and has a constant shape in the Z direction.

(The fifth embodiment of the nozzle)

As shown in Figs. 8A to 8D, the notches 54 and 54 provided in the respective long wall portions 51, 51 are trapezoids of the same size, and may be formed only at both ends of the long wall portion 51 except for the Y-direction. The central part. Specifically, in this embodiment, the notch 54 has the center point T5 of the upper bottom on the center line M5 of the long wall part 51, and is a symmetrical isometric trapezoid with respect to the center line M5 (the upper bottom is shorter than the lower bottom). The internal angle θ5 (the internal angles on both sides of the upper bottom) is, for example, greater than 90° to 160° (preferably 110° to 150°). In addition, in this embodiment, the nozzle hole 53 has a flat oblong shape and has a constant shape in the Z direction.

(The sixth embodiment of the nozzle)

As shown in Figures 9A to 9D, the notches 54 and 54 provided on the long wall portions 51 and 51 are trapezoidal in the same size, and the base end side of the long wall portion 51 may be formed in a partial area in the Y direction. , And the front end side of the long wall portion 51 is formed in the entire area in the Y direction. In detail, in this embodiment, the notch 54 has the center point T6 of the upper bottom on the center line M6 of the long wall part 51, and is symmetrical with respect to the center line M6 in an isometric trapezoid shape. The internal angle θ6 (the internal angles on both sides of the upper bottom) is, for example, greater than 90°~160° (preferably 110°~150°). In addition, in this embodiment, the nozzle hole 53 has a flat oblong shape and has a constant shape in the Z direction.

In addition, the shape of the nozzle hole 53 can be variously deformed. Hereinafter, an embodiment which is a modified example thereof will be described. In addition, the shape of the notch 54 is illustrated by taking the triangle shown in FIG. 4A as an example, but it is not limited to this, and it may have the shape of the notch 54 in the above-mentioned modification.

(The seventh embodiment of the nozzle)

As shown in Figs. 10A to 10D, in the base end of the nozzle 5, the nozzle hole 53 may also have a slit 53a elongated in the Y direction and provided at both ends of the slit 53a. The size in the X direction is larger than that of the slit. The part 53a is a large enlarged part 53b. Specifically, in this embodiment, the nozzle hole 53 has an enlarged portion 53b formed in a circular dumbbell shape. As shown in FIG. 10D, the shape of the nozzle hole 53 may be changed at the tip of the nozzle 5 in which the notch 54 is formed so that the flow path area in the Y direction becomes substantially the same (in the example of the figure, it is an oval). At this time, the flow path of the nozzle hole 53 at the base end shown in FIGS. 10B and 10C is all included in the flow path of the nozzle hole 53 at the front end shown in FIG. 10D. In addition, the tip portion of the nozzle 5 may be provided with the nozzle hole 53 having the same dumbbell shape.

(Eighth Embodiment of Nozzle)

As shown in FIGS. 11A to 11D, in the base end of the nozzle 5, the nozzle hole 53 may have an area change portion 53c whose flow path area gradually expands from the center in the Y direction toward both ends. Specifically, in this embodiment, spray The mouth hole 53 is a shape in which each vertex of two equilateral triangles is abutted, and the bisector of the vertex angle is arranged on the same straight line (Y direction). As shown in FIG. 11D, the shape of the nozzle hole 53 may be changed at the tip of the nozzle 5 in which the notch 54 is formed so that the flow path area in the Y direction becomes substantially the same (the example of the figure is rectangular). At this time, the flow path of the nozzle hole 53 at the base end shown in FIGS. 11B and 11C is all included in the flow path of the nozzle hole 53 at the front end shown in FIG. 11D.

(Ninth Embodiment of Nozzle)

As shown in FIGS. 12A to 12D, the nozzle hole 53 may be a rectangle with a certain shape in the Z direction.

(Tenth Embodiment of Nozzle)

As shown in FIGS. 13A to 13D, the nozzle hole 53 at the base end of the nozzle 5 may be divided into a plurality of nozzle holes 53d. Specifically, the nozzle hole 53d has a circular shape, and is provided at both ends in the Y direction at an interval from the center. As shown in FIG. 13D, the shape of the nozzle hole 53 may be changed at the tip portion of the nozzle 5 in which the notch 54 is formed so that the divided plural nozzle holes 53d merge into one (an oval shape in the example in the figure). At this time, the flow path of the nozzle hole 53 at the base end shown in FIGS. 13B and 13C is all included in the flow path of the nozzle hole 53 at the front end shown in FIG. 13D.

(Eleventh Embodiment of Nozzle)

As shown in Figures 14A to 14D, the base end of the nozzle 5 sprays The nozzle hole 53 may alternately have a large-area portion 53e with a large flow path area and a small-area portion 53f with a small flow path area in the Y direction. In detail, in this embodiment, circular large-area parts 53e are provided at both ends and the center part in the Y direction. Between adjacent large-area parts 53e, circular small-area parts 53f are provided to connect with each other. Large area 53e on both sides. As shown in FIG. 14D, the shape of the nozzle hole 53 may be changed at the tip of the nozzle 5 where the notch 54 is formed so that the flow path area in the Y direction becomes substantially the same (in the example of the figure, it is an oval). At this time, the flow path of the nozzle hole 53 at the base end shown in FIGS. 14B and 14C is all included in the flow path of the nozzle hole 53 at the front end shown in FIG. 14D.

(Twelfth Embodiment of Nozzle)

As shown in FIGS. 15A to 15D, in the base end of the nozzle 5, the nozzle hole 53 may have an area change portion 53g whose flow path area gradually decreases from the center in the Y direction toward both ends. Specifically, in this embodiment, the shape of the nozzle hole 53 is a rhombus. At this time, as shown in Figure 15D, at the tip of the nozzle 5 where the notch 54 is formed, the shape of the nozzle hole 53 may be changed so that the flow path area in the Y direction becomes substantially the same (the example of the figure is an oval shape). At this time, the flow path of the nozzle hole 53 at the base end shown in FIGS. 15B and 15C is all included in the flow path of the nozzle hole 53 at the front end shown in FIG. 15D.

The glass fiber Gm produced by pulling out the molten glass G from the nozzle 5 of the above-mentioned manufacturing device is a special shape with a flat cross section (a cross section perpendicular to the drawing direction) as shown in Figures 16A and 16B. section. In this embodiment, when the long diameter of the cross section of the glass fiber Gm is A and the short diameter is B, the aspect ratio (A/B) of the cross-sectional shape is in the range of 1.5 to 20 (preferably 3 to 10) . In addition, as long as it is a tow Gs composed of the above glass fiber Gm, for example, when it is cut to a length of 3mm to form a chopped glass strand, it is suitable for obtaining components with strict requirements for dimensional crystallinity such as the frame of electronic control equipment. The nature of it is used as a reinforcing material for the necessary composite material. Thereby, the effect of reducing the distortion of the frame body after injection molding or improving the strength is obtained.

In addition, in the present embodiment, the value obtained by dividing the average value of the aspect ratio by the uneven value σ of the aspect ratio of the glass fiber Gm, expressed as a percentage, is 15% or less. That is, glass fiber Gm with little unevenness can be obtained. In addition, it is preferable that the value obtained by dividing the average value of the aspect ratio by the uneven value σ of the aspect ratio of the glass fiber Gm by a percentage is 10% or less.

Here, the aspect ratio of the glass fiber Gm is measured as follows. First, in order to observe the cross section of the glass fiber Gm, the glass fiber Gm was vertically embedded in Technovit, a room temperature hardening resin manufactured by Kulzer Corporation, and the resin was cured and polished. Next, observe the cross-sectional shape of the glass fiber Gm with a polarizing microscope, and measure the respective lengths of the major axis and the minor axis of the glass fiber Gm observed using the image processing software WinROOF manufactured by Mitani Corporation, to calculate the aspect ratio (longer diameter/ Short path). In addition, the non-average value σ of the aspect ratio is a standard deviation calculated from the aspect ratio obtained by observing the cross section of 50 glass fibers Gm.

In addition, the present invention is not limited to the above-mentioned embodiment, and can be implemented in various forms.

Example

(Example 1)

The long wall portion 51 is used to line up 100 bushings of the nozzle 5 in parallel in a straight line as shown in Fig. 8A to Fig. 8D, and spinning is performed at a temperature at which ^{the viscosity of the molten glass becomes 10 3.0 dPa·s.} Observing the cross-sectional shape of the obtained glass fiber, the average aspect ratio (long diameter/short diameter) was 4.8, and the uneven value σ was 0.14. As a result, the value (percentage) obtained by dividing the average of the aspect ratio by σ was 2.9%. In addition, there was no nozzle deformation after one week of production.

(Example 2)

The long wall portion 51 is used to line up 100 bushes of nozzles 5 in parallel in a straight line as shown in Fig. 15A to Fig. 15D, and spinning is performed at a molding temperature at which ^{the viscosity of the molten glass becomes 10 3.0 dPa·s.} Observing the cross-sectional shape of the obtained glass fiber, the average aspect ratio was 2.8, and the uneven value σ was 0.24. As a result, the value (percentage) obtained by dividing the average of the aspect ratio by σ was 8.5%. In addition, there was no nozzle deformation after one week of production.

(Example 3)

Use the long wall 51 to line up 100 bushes of the nozzle 5 in parallel in a straight line as shown in Figs. 8A to 8D and the cooling fins arranged parallel to the long wall 51 of the nozzle 5, and the viscosity of the molten glass becomes 10 ^3.0 Spinning is performed at the forming temperature of dPa‧s. Observing the cross-sectional shape of the obtained glass fiber, the average aspect ratio was 5.0, and the uneven value σ was 0.10. As a result, the value (percentage) obtained by dividing the average of the aspect ratio by σ was 2%. In addition, there was no nozzle deformation after one week of production.

(Comparative example 1)

Use long wall portion 102 are parallel to the first set 100 as in FIG 17A - FIG. 17D showing the first nozzle on a line 101 to the bush, the viscosity of the molten glass to the forming temperature becomes 10 ^3.0 dPa‧s by spinning. The nozzle 101 includes a long wall portion 102 and a short wall portion 103, and the long wall portion 102 has a rectangular notch 105. The nozzle hole 104 has an oblong shape, and has a constant shape in the vertical direction. Observing the cross-sectional shape of the obtained glass fiber, the average aspect ratio was 2.2, and the uneven value σ was 0.27. As a result, the value (percentage) obtained by dividing the average of the aspect ratio by σ was 12.2%. In addition, after a week of continuous production, it was confirmed that the nozzle was deformed.

(Comparative example 2)

The long wall portion 202 is used to set 100 nozzles 201 in parallel on a straight line, as shown in Fig. 18A to Fig. 18D, and spinning is performed at a molding temperature where ^{the viscosity of the molten glass becomes 10 3.0 dPa·s.} The nozzle 201 includes a long wall portion 202 and a short wall portion 203, but neither the long wall portion 202 nor the short wall portion 203 has a notch. The nozzle 204 has an oblong shape, and the vertical direction is constant. Observing the cross-sectional shape of the obtained glass fiber, the average aspect ratio was 1.8, and the uneven value σ was 0.11. As a result, the value (percentage) obtained by dividing the average of the aspect ratio by σ was 6%. In addition, it was confirmed that there was no deformation of the nozzle tip even after production continued for one week.

As explained above, in Examples 1 to 3, the average of the aspect ratio of the glass fiber is increased by the effect of the notch, and the shape of the notch is appropriately adjusted without deformation at the tip of the nozzle, so unevenness can be obtained. Good results with small σ. In contrast, in Comparative Example 1, the effect of the notch portion increased the average aspect ratio of the glass fiber, and the nozzle tip portion was deformed due to the improper notch portion, resulting in an increase in the unevenness σ. In addition, in Comparative Example 2, since there is no notch, compared with Examples 1 to 3, the average aspect ratio becomes smaller. Therefore, it can be confirmed that according to the present invention, the deformation of the nozzle can be suppressed, and the forming of the glass fiber with a special-shaped cross-section can be performed stably.

5: Nozzle

51: Long Wall

53: Nozzle hole

54: Notch

M1: Centerline

W: The opening width of the notch

T1: vertex

θ1: Vertex angle

Claims (2)

A glass fiber assembly consisting of a plurality of glass fibers, characterized in that the glass fiber has a special-shaped cross-section with a flat cross-section, and the average value of the aspect ratio is divided by the uneven value σ of the aspect ratio of the cross-section. The value (percentage) is 2.9% or less. The glass fiber aggregate according to claim 1, wherein the aspect ratio of the cross section is 1.5-20.

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