JPS6212630A - Device for spinning glass fiber - Google Patents

Abstract

PURPOSE:To carry out smoothly automatic regeneration of cut filament even in the case of small diameter and to obtain efficiently glass fibers, by spinning molten glass by the use of an orifice plate wherein a great number of orifices of a specific structure are closely arranged. CONSTITUTION:Part of the orifice plate 1 is protruded from the bottom to the top while keeping the thickness of the plate 1 constant, the conic dents 3 are formed on the bottom of the plate 1, the two orifices 2 are slantingly bored through each of the dent 3 in such a way that the outlets of the orifices are high at the sides close to each other and low at the opposite sides and a great number of the dents 3 are arranged in the plate 1. Then, the orifice plate 1 is attached to the bottom of the bushing 4, the molten glass 5 put in the bushing is made to flow through a great number of the orifices 2, spun into a great number of the filaments 6 and the glass fibers are wound through the applicator 7, the collecting device 8 and the traverse motion 10 round the winding pipe 11. Even if one filament is cut during spinning, the molten glass crawls up to the center of the dent 3, is joined with a filament from another orifice and separated to regenerate automatically a filament.

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION The present invention utilizes a bushing having an orifice plate at the bottom with a number of orifices arranged in a close array, allowing the molten glass in the bushing to flow out through the orifices and exit each orifice. Glass Il miscellaneous in which cones of molten glass are formed, these cones are stretched to form filaments, and the numerous filaments thus formed are collected into one or more strands and wound around a collet. III to the spinning device.

"Prior Art" In the above-mentioned spinning device, if one filament breaks due to the presence of foreign matter or air bubbles in the glass during operation or other causes,
The cone that formed the cut filament spreads laterally on the lower surface of the orifice plate, merges with the adjacent cone, cuts the adjacent filament, and furthermore, the merge spreads to the adjacent cone one after another, until the entire orifice plate is merged.

This phenomenon is called "flooding" and is well known in the art. When such flooding occurs - the winding operation must be stopped, a skilled worker must manually separate the combined glass into individual filaments, and the winding operation must be started again, resulting in wasted waste. The amount of time and raw materials used will significantly reduce productivity.

In order to solve this problem, when one filament breaks, there is no need to manually separate and regenerate it.
An orifice plate that automatically regenerates cut filament while the winding operation continues is disclosed in Japanese Patent Application Laid-Open No. 60-3634.
This was proposed in Publication No. 5. This orifice plate has an orifice with a cross-sectional shape that is long in one direction, such as a rectangle, an ellipse, or a crescent shape, and at least two of these orifices.
The orifice plates are arranged in a symmetrical manner so that one longitudinal end of each group is close to each other, and the orifice plate is recessed at a suitable position from bottom to top while keeping the thickness of the orifice plate virtually constant. A recess is formed in the lower surface in which at least a portion of each orifice outlet of each group is open, and thus each orifice outlet of each group is inclined such that it is higher on the side closer to the center of the recess and lower on the side far from the center. Therefore, when one filament in a group is cut, the molten glass flowing out of the orifice outlet of the cut filament immediately merges with the molten glass flowing out of the other orifice outlet of the filament in the same group that continues to form. Then, the combined molten glass is automatically separated into individual orifices by the tensile action of the filament formed through said other orifice, and in this way the cut filament is automatically regenerated.

"Problems to be Solved by the Invention" The automatic regenerating orifice plate disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 60-36345 has a problem in that it takes a relatively long time from the time the filament is cut to the time it is regenerated. ,
For this reason, the molten lath flowing out from the orifice between cutting and regeneration tends to form large lumps that adhere to the regenerated filament and break it when it comes into contact with other filaments in a concentrator or the like. This tendency becomes more pronounced as the glass lump attached to the recycled filament becomes larger and as the spun filament becomes thinner. Therefore, JP-A-60-3634
The orifice plate of Publication No. 5 cannot be applied to spinning filaments with a diameter below a certain limit, and even if thick filaments can be avoided from being cut by glass lumps, products with large lumps attached may not be used depending on the application. Undesirable.

Furthermore, the orifice plate disclosed in Japanese Patent Application Laid-Open No. 60-36345@ has a problem in that the orifice has a special cross-sectional shape, requiring a special machining method such as electric discharge machining, which takes time and cost to manufacture.

"Means for Solving the Problems" The present invention is a glass fiber spinning device that uses an orifice plate with a relatively simple structure and can smoothly automatically regenerate cut filaments even when spinning small diameter filaments. JP-A-60-3634
Similar to the orifice plate of Publication No. 5, at least two orifices are arranged in a group in a symmetrical relationship, and at least a portion of the outlet of each orifice in the group makes the orifice plate substantially constant in thickness. While maintaining the same position, recess it from the bottom to the top so that it opens into the recess formed on the bottom surface of the orifice plate, so that the outlet of each orifice is higher on the side closer to the center of the recess and lower on the side far from the center of the recess. This method allows a cut filament to be tilted and regenerated with the help of other filaments in the same group.
The feature is that the cross-sectional shape of the orifice is circular.

"Operation" According to the present invention, since the orifice is circular,
Compared to a rectangular orifice like the orifice plate of Publication No. 36345, if the distance between the first pair of orifices is the same, the distance between the orifice centers will be shorter and the resistance to the flow of molten glass will be smaller. Therefore, for the same flow rate, the cross-sectional area becomes smaller and the distance between the orifice centers becomes shorter. Therefore, since the distance between adjacent filaments is shortened, when one filament is cut, the time it takes for it to coalesce with the adjacent filament is shorter than with a rectangular orifice. Since the time required for this process is shorter, the amount of molten glass that does not form into filaments and accumulates in the center of the recess during this time is reduced. For this reason, after the filament is regenerated, the glass lumps that are pulled out from the recess and solidified and transported attached to the regenerated filament become smaller, so that the tendency to break the adjacent filament when it comes into contact with it becomes weaker, and the filament becomes smaller in diameter. It becomes possible to spin.

"Embodiment" FIG. 1 is a plan view showing a part of the lower surface of an embodiment of the orifice plate used in the present invention, and FIG. 2 is a plan view showing a portion of the orifice plate shown in FIG. It is a cut sectional view. The orifice plate 1 has an array of circular orifices 2 in pairs, and the portion of the orifice plate containing the eight pairs of orifices 2°2 is removed from below, keeping the thickness of the orifice plate virtually constant. A number of conical recesses 3 are formed on the lower surface of the orifice plate by recessing it upward. The outlets of the eight pairs of two orifices 2, 2 therefore open obliquely into the recess 3 such that the side adjacent to the beans is higher and the opposite side is lower. The eight pairs of two orifices 2.2 are usually arranged symmetrically with respect to the center of the recess 3 and the entire outlet is contained within the recess 3, but the center of symmetry of the two orifices is the center of the recess. Even if the two orifices deviate from each other, or a portion of the outlet protrudes outside the recess, the present invention can be carried out as long as the two orifices have at least a portion of the outlet on the slope of the recess and face each other. It is possible.

FIG. 3 is a front view showing the operating state of the glass fiber spinning apparatus of the present invention using the orifice plate having the above structure. Molten glass 5 in a bushing 4 having an orifice plate 1 at the bottom flows out through a number of orifices 2 and is spun into a number of filaments 6 into an applicator 7.
After applying the sizing agent in the strand 9, a strand 9 is
focused on. The strand 9 is traversed by a traverse device 10 and wound onto a winding tube 11. In the figure, 12 is a manifold in which a large number of air nozzles for spraying cooling air onto the lower surface of the orifice plate 1 are arranged.

According to the present invention, when one filament is cut by the above device during spinning operation, the cut filament is automatically regenerated by the process shown in FIG. Figure 4 (a) shows a state in which cones of molten glass are formed under each of a pair of orifices opening in one recess and are stably spun into filaments, and (b) shows a state where the filament is spun into filaments. One of the molten glass cones has broken and one of the molten glass cones has begun to shrink. The molten glass in the bushing continues to flow out of the orifice where the filament was cut, but since this molten glass is not subjected to any downward pulling force, it spreads around as shown in (c), with some of it flowing out to the apex at the center of the recess. It creeps up toward the cone formed at the other orifice exit. The molten glass that continues to flow out to the outlet of the orifice where the filament was cut increases its contact with the other cone, and finally coalesces with the other cone as shown in (d), forming a single piece of molten glass flowing out from the two orifices. A thick filament is formed from this cone. When this state is reached, the cone formed across the two orifices receives a force G that pulls it apart diagonally downward in both directions along the orifice exit surface as shown in (e) when it is pulled by the filament, so it becomes concave. A void is formed near the center of the orifice, and this void gradually expands downward until the cone completely splits and separates into two cones, one for each orifice, as shown in (f). Normal filaments are formed. The filament thus cut is automatically regenerated with the help of the filament formed in the other orifice of the pair.

5 and 6 are a plan view and a sectional view showing the arrangement relationship between a pair of orifices and a recess in an orifice plate in which rectangular orifices are formed according to the principles of the invention disclosed in Japanese Patent Application Laid-Open No. 60-36345. It is. This orifice plate is different from the orifice plate of the present invention having circular orifices shown in FIGS. The distance is getting bigger. Also, since a rectangular orifice provides greater resistance to the flow of molten glass than a circular orifice, the cross-sectional area must be increased in order to equalize the amount of molten glass flowing out to spin filaments of the same diameter. Must be. This means that the distance between the orifice centers becomes larger. Therefore, the rectangular orifice 2' shown in FIGS. 5 and 6 has a relatively large distance between the filaments formed from adjacent orifices 2' in pairs, so that when the filament is cut, it continues to the orifice. It takes a relatively long time for the outflowing molten glass to creep toward the center of the recess 3' and merge with the molten glass flowing out into the adjacent orifice, so it collects in the center of the recess without becoming a filament. The amount of molten glass increases. At the same time as the filament is regenerated, this accumulated molten glass becomes a large lump of glass that adheres to the regenerated filament and is transported, and when this is transported to a place where it comes into contact with other filaments, such as the concentrator 8. Damage and cut this.

For this reason, the self-regeneration method using a long and narrow orifice as shown in JP-A-60-36345 has a limit to the diameter of the filament to which it can be applied.

The circular orifice 2 of the present invention can reduce the distance between filaments spun from a pair of adjacent orifices, so when a filament is cut, it takes less time to merge with an adjacent filament, resulting in a regenerated filament. Since the glass clumps that adhere are smaller, there is less chance of cutting other filaments. Therefore, the present invention can sufficiently exhibit the self-regeneration effect of cut filaments even when spinning filaments with a small diameter.

Data from comparative experiments conducted on a rectangular orifice and a circular orifice of the present invention are shown in Table 1.

Table 1 As shown in Table 1, the distance between adjacent filaments formed from a pair of orifices is 31 m for the circular orifice, while it is 51 m for the rectangular orifice.

Figure 7 shows rectangular orifice and circular orifice.
When one of the two filaments formed from a pair of orifices is cut, the time required for the molten glass flowing into one orifice to join the molten glass flowing out from the other orifice, and the glass per pair of orifices It is a graph showing the results of measuring the relationship with the discharge amount. In the graph, A is a rectangular orifice and B is a circular orifice, clearly showing that the circular orifice has a shorter merging time. Furthermore, this graph shows that the difference in merging time between the culm rectangular orifice, which reduces the amount of glass discharged, and the circular orifice, increases, and the circular orifice of the water-spinning invention, which reduces the fiber diameter of the filament that will be spun from now on, is more advantageous. It turns out that it becomes According to the experimental results, the minimum msi diameter of the filament that can utilize the self-regeneration effect was 15.1μ for the rectangular orifice, whereas it was 13.1μ for the circular orifice of the present invention.

In the embodiment of the present invention described above, a pair of orifices 2 are disposed facing each other in each recess 3 so that the two orifices cooperate to regenerate the cut filament. It is also possible to arrange three or four of these orifices symmetrically for each recess so that the four orifices cooperate in self-renewal as a group. Also, instead of providing one recess for each pair of orifices, one common long groove is formed for multiple pairs of orifices, as shown in Figure 8, and multiple pairs of recesses are formed across the center line. each of the orifices may be arranged.

"Effects of the Invention" Since the present invention uses a circular orifice, the distance between adjacent filaments is shorter than that of a long orifice, so that the filament is cut and then merged with the adjacent filament. Due to the automatic separating action, the time required for the filament to be regenerated is shortened, and during this time the orifice where the filament was cut flows out, reducing the amount of molten glass that remains without being formed into a filament. As a result, when the filament is regenerated, the molten glass that remains solidifies and the glass lumps that adhere to the regenerated filament become smaller, making it less likely that it will be cut when it comes into contact with other filaments, making it possible to spin filaments with a correspondingly smaller diameter. becomes applicable to Further, a circular orifice has the advantage of being easier to process than a long orifice.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a part of the lower surface of an embodiment of the orifice plate used in the present invention, and Fig. 2 is a plan view showing a part of the orifice plate in Fig. 1 along line ■-n. This is a cross section. FIG. 3 is a front view showing the state in which the glass fiber spinning apparatus of the present invention is operated using the above-mentioned orifice plate. FIG. 4 is an explanatory diagram showing the process by which one filament is regenerated according to the present invention when it is cut. 5 and 6 are a plan view and a sectional view showing the arrangement relationship between a pair of orifices and recesses in a conventionally known self-regenerating orifice plate having rectangular orifices. FIG. 7 is a graph showing the results of measuring the relationship between the merging time of cut filaments and the discharge amount of molten glass for a rectangular orifice and a circular orifice. FIG. 8 is a perspective view of an embodiment in which the recess is formed as a continuous groove common to a plurality of orifices. 1... Orifice plate 2... Orifice 3... Concavity

Claims (1)

[Claims] A number of closely spaced orifices are arranged in a symmetrical relationship in groups of at least two orifices, and the orifice plate is positioned at the lower side while maintaining a substantially constant thickness of the orifice plate. is recessed upward from the orifice plate to form a recess in which at least a portion of each orifice outlet of each group opens, such that each orifice outlet of each group is higher and farther from the center of the recess. Use an orifice plate that is sloped to be lower on the side, and when one of the filaments in the group is cut, the molten glass will flow out into the orifice outlet of the cut filament, continuing the formation of the filaments in the same group. It automatically merges the molten glass flowing out of another orifice outlet, and then automatically separates the merged molten glass into individual orifices by the tensile action of the filament formed through said other orifice, thus automatically regenerating the cut filament. 1. A glass fiber spinning apparatus capable of performing the above-mentioned orifices, wherein each of the orifices has a circular cross-sectional shape.