JP2004218113A - Manufacturing method of glass cloth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing glass cloth, by which a twist is not imparted to a glass yarn constituting the gloss cloth. <P>SOLUTION: The method for producing the glass cloth comprises using the glass yarn 10 measured by a length measuring drum 14. A glass cake 12 is placed on a rotator so that the winding axis α of the glass cake is parallel with the revolving shaft β of the rotator. The glass yarn is wound on the length measuring drum so that a twist opposite to a twist caused by drawing out the glass yarn from the glass cake in the approximately winding axial direction is produced and the glass yarn is measured. The glass cloth is woven by using the measured glass yarn. The rotational speed of the rotator is controlled according to the change of the twist of the glass yarn caused according to the amount of the yarn drawn out from the glass cake so that the twist to be canceled is imparted by winding the glass yarn to be wound on the length measuring drum on the length measuring drum. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a glass cloth.
[0002]
[Prior art]
Glass cloth is used as a reinforcing material for forming a printed wiring board or the like. Printed wiring boards are used in electronic devices and the like, and electronic devices and the like have been aimed at miniaturization and high functionality with the advancement of technology in recent years. For this reason, glass cloth for printed wiring boards is also required to be smooth and thin.
[0003]
There is a method of opening and weaving non-twisted glass fiber strands to reduce the thickness of glass cloth (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
JP-A-9-324340
[0005]
[Problems to be solved by the invention]
However, even if non-twisted glass yarn is used for the original yarn, the following problems have occurred in the glass cloth manufacturing process.
[0006]
In the production of glass cloth, first, in a spinning step, a glass yarn wound on a winding tube and drawn from a glass cake, or further industrially twisted glass yarn is used as a warp and a weft. Then, in the weaving process of the glass cloth, the glass yarn for the weft is measured on a loom to a length corresponding to the width of the glass cloth. Generally, this length measurement is performed by winding a glass yarn drawn from a glass cake a plurality of times around a length measurement drum. However, if the glass yarn is wound around the measuring drum and pulled out, the glass yarn may be twisted once because the glass yarn goes around the outer circumference of the measuring drum at the time of drawing. Here, "twist" is not a twist when industrially twisted to a bundle of glass fiber filaments, but to a non-twisted glass yarn that is not subjected to such industrial twisting. For example, it means a twist that occurs naturally when it is pulled out from a length measuring drum or a glass cake.
[0007]
Therefore, even if a non-twisted glass yarn is used for the original yarn, the glass yarn measured as described above may be twisted in some cases. When such twisting occurs, the thickness of the glass cloth increases at that portion.
[0008]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a glass cloth in which a glass yarn constituting the glass cloth has no twist.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, a method for producing a glass cloth according to the present invention is a method for producing a glass cloth using glass yarns measured by a length measuring drum, wherein a glass cake is placed on a rotating body. Place the winding axis of the cake parallel to the rotation axis of the rotating body, and place the glass yarn on the measuring drum so that the twist is opposite to the twist caused by drawing the glass yarn from the glass cake in the direction of the winding axis. Winding and measuring the length, weaving a glass cloth using the measured glass yarn, twisting the glass yarn to be wound around the length measuring drum, which is canceled by winding around the length measuring drum, occurs. As described above, the present invention is characterized in that the rotation speed of the rotating body is controlled in response to a change in the twist of the glass yarn generated according to the amount of drawing from the glass cake.
[0010]
According to the above-described manufacturing method, the glass yarn is wound around the length measuring drum such that a twist opposite to that caused by drawing the glass yarn from the glass cake in a substantially winding axis direction is generated. At this time, as the twist canceled by winding around the measuring drum occurs in the glass yarn to be wound around the measuring drum, it corresponds to the change in the twist of the glass yarn that occurs according to the amount pulled out from the glass cake To control the rotation speed of the rotating body. Therefore, the twist of the measured glass yarn is eliminated, and a glass cloth can be woven using the glass yarn in which the twist has been eliminated.
[0011]
In the method for producing a glass cloth according to the present invention, it is preferable that the glass yarn is drawn from the inside of the glass cake, and the rotation speed of the rotating body is controlled so as to increase in accordance with the drawing amount of the glass yarn. .
[0012]
When the glass yarn is drawn from the inside of the glass cake, the inner diameter of the glass cake becomes longer according to the amount of drawing. Therefore, the twist per drawn length generated in the drawn glass yarn is reduced. On the other hand, the rotation speed of the rotating body is increased in response to the change in the twist of the glass yarn generated according to the amount of drawing of the glass yarn. Therefore, the glass yarn to be wound around the length measuring drum has a twist that is canceled by the length measuring drum.
[0013]
Further, the method for manufacturing a glass cloth according to the present invention is a method for manufacturing a glass cloth using glass yarns measured by a length measuring drum, wherein the winding axis of the glass cake is set on a rotating body. Place the glass yarn in parallel with the rotation axis of the rotating body, draw out the glass yarn from the glass cake in the direction of the winding axis, rotate the rotating body in the direction opposite to the rotation direction of the drawing position of the glass yarn in the glass cake, and rotate the glass yarn. The rotation speed of the rotating body is controlled so as to cancel the twist in response to the change in the twist of the glass yarn generated in accordance with the drawing of the glass yarn. Wrap around the drum and wind the glass yarn wound around the first drum around the length measuring drum so that the twist is opposite to the twist that occurs in the first drum Measuring poured, characterized by weaving the glass cloth with the length measuring glass yarns.
[0014]
According to such a manufacturing method, the glass yarn to be wound on the first drum is in a state in which no twist occurs. Therefore, when the glass yarn is wound around the first drum and further drawn, the glass yarn is twisted due to the winding around the first drum. Then, the glass yarn is wound around the length measuring drum so as to cause a twist opposite to the twist caused by the first drum, so that the twist of the glass yarn pulled out from the length measuring drum is canceled.
[0015]
In the method for manufacturing a glass cloth using the first drum and the length measuring drum as described above, when the glass yarn is drawn from the inside of the glass cake, the rotation speed of the rotating body is set to the amount of the drawn glass yarn. What is necessary is just to control so that it may decelerate according to it.
[0016]
Furthermore, the method for manufacturing a glass cloth according to the present invention is a method for manufacturing a glass cloth using glass yarn measured by a length measuring drum, wherein the glass cake is rotated, and the glass cake is rotated from the outside to the outer circumferential direction. Then, the glass yarn is pulled out and wound around the second drum, and the glass yarn wound around the second drum is wound around the length measuring drum so that a twist opposite to the twist generated in the glass yarn is generated. It is characterized by weaving a glass cloth using a long and measured glass yarn.
[0017]
According to the above method, since the glass yarn is drawn in the outer peripheral direction from the outside of the glass cake, the glass yarn is not twisted when the glass yarn is drawn. In addition, the length measuring drum is wound so as to generate a twist opposite to the twist generated in the second drum. Therefore, the twist of the glass yarn caused by the second drum is canceled by winding it around the length measuring drum and pulling it out. That is, the glass yarn pulled out from the length measuring drum is in a state where no twist is generated. Therefore, a glass cloth can be woven using a glass yarn free from such twisting.
[0018]
Furthermore, a glass cloth manufacturing method according to the present invention is characterized in that the glass cloth woven by the above-described manufacturing method is subjected to a fiber opening treatment.
[0019]
By performing the fiber opening treatment on the glass cloth in which the twist of the weft is reduced as much as possible, there is no restriction between the glass fiber filaments due to the twist, and the fiber opening becomes easier because the glass fiber filament moves smoothly. Further, since there is no difference between the twisted portion and the non-twisted portion of the glass yarn, the entire glass cloth is uniformly opened, and as a result, the glass cloth can be thinned.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same reference numerals are used for the same elements, and redundant description will be omitted.
[0021]
(1st Embodiment)
1 to 4 are diagrams illustrating a method for manufacturing a glass cloth for a printed circuit board according to the present embodiment.
[0022]
In the present embodiment, a non-twisted glass yarn or a non-twisted glass yarn (hereinafter simply referred to as “yarn”) 10 using only the weft is used as the warp and the weft of the glass cloth. Usually, the yarn constituting the glass cloth is obtained by coating a glass fiber filament with a sizing agent, twisting the bundle, and twisting it industrially. On the other hand, the non-twisted yarn 10 used in the present embodiment means a yarn that is not twisted. Further, as the yarn 10 for the warp and the weft, the glass fiber filaments constituting them may be both irregular cross-section fibers or circular cross-section fibers, or one of the yarns 10 for the warp and the weft. May be composed of fibers having an irregular cross section and the other may be composed of fibers having a circular cross section.
[0023]
As shown in FIG. 1, a glass cloth is basically manufactured through a spinning step S10, a warping step S12, a weaving step S14, a fiber opening step S16, a deoiling step S18, and a surface treatment step S20. Hereinafter, each step will be described.
[0024]
In the spinning step S10, the non-twisted yarn 10 is wound around a winding tube to form a glass cake (hereinafter simply referred to as "cake") 12.
[0025]
In the warping step S12, the yarn 10 is drawn out of the cake 12 so as not to be twisted, and is warped.
[0026]
In order to pull out the yarn 10 from the cake 12 without twisting, for example, the yarn 10 may be drawn from the outside of the cake 12 to the outer peripheral direction as shown in FIG. In the present embodiment, a method in which the yarn 10 is drawn from the outside of the cake 12 toward the outer periphery of the cake 12 in this manner is called a creel method.
[0027]
In the weaving step S14, the yarn 10 is pulled out from the inside of the cake 12 substantially in the direction of the winding axis α, and the diameter D shown in FIG. ₀ The yarn 10 is wound around the length measuring drum 14 a plurality of times and the length corresponding to the width of the glass cloth is measured. Pulling out the yarn 10 from the cake 12 substantially in the direction of the winding axis α is called a pull method. Then, the measured yarn 10 is used as the weft, and the yarn 10 warped in the warping step S12 is woven as a warp by an air jet loom, a rapier loom, or the like. The weave is not particularly limited, and plain weave, satin weave, twill weave, nanako weave, or the like may be used.
[0028]
By the way, when the yarn 10 is wound around the length measuring drum 14, when the yarn 10 is pulled out from the length measuring drum 14, the yarn 10 is twisted once every time the yarn 10 goes around the outer circumference of the length measuring drum 14. The degree of torsion generated when wound around a cylindrical body such as a drum having a diameter D (mm) and pulled out in the direction of the substantially central axis thereof is expressed as 25 / (π · D) per 25 (mm). , Hereinafter referred to as the torsion index.
[0029]
When manufacturing a thin glass cloth, the number of twists of the yarn 10 drawn from the length measuring drum 14 needs to be 3 times / 1200 mm or less (twist index: 0.06 or less), and 1 time / It is preferably 1200 mm or less (twist index: 0.02 or less), and more preferably 0.5 times / 1200 mm or less (twist index: 0.01 or less).
[0030]
In the present embodiment, the length is measured so that the yarn 10 drawn from the length measuring drum 14 is not twisted. The length measuring method in the present embodiment will be described with reference to FIG.
[0031]
First, as shown in FIG. 3, the cake 12 is placed on a rotating body 16 such as a turntable so that the winding axis α of the cake 12 substantially coincides with the rotating axis β of the rotating body 16. In addition, the rotating body 16 is connected to a control device (not shown) so that the rotating speed is controlled.
[0032]
Next, the yarn 10 is pulled out from the inside of the cake 12 by a pull method. As described above, when the yarn 10 is pulled out by the pull method, the drawing position P of the yarn 10 rotates along the inner periphery of the cake 10 as the yarn 10 is drawn. Therefore, the yarn 10 is twisted. The direction of this twist depends on how the cake 12 is placed, but in the present embodiment, the drawn yarn 10 is twisted clockwise, that is, the drawn position P is rotated in the direction of arrow A in FIG. . Such a clockwise twist is called an S-shaped twist. The twist opposite to the S-type twist, that is, the left-handed twist of the yarn 10 is called a Z-type twist.
[0033]
Then, the yarn 10 drawn from the cake 12 is wound around the length measuring drum 14 so that a Z-shaped twist is generated.
[0034]
When the yarn 10 is drawn from the cake 12 as described above, the rotating body 16 is rotated in the same direction as the direction in which the yarn 10 is released (arrow A in FIG. 3) so that an S-shaped twist is generated in the yarn 10. Rotate. In addition, the rotational speed of the rotating body 16 is applied to the yarn 10 to be wound around the length measuring drum 14 by the amount of twist canceled by the length measuring drum 14, that is, the twist index of the Z-shaped twist generated by the length measuring drum 14. The S-type twist, which is the same index, is increased so as to always occur in the yarn 10. The reason for increasing the rotation speed in this way will be described below. In the following description, the diameter D of the length measuring drum 14 will be described. ₀ Is set to 150 mm. Also, the inner diameter D of the cake 12 before the yarn 10 is drawn out. ₁ Is 150 mm and the outer diameter D of the cake 12 ₂ Is set to 300 mm.
[0035]
When the yarn 10 is pulled out, the inner diameter D ₁ Is 150 mm, the twist index S of the twist generated in the yarn 10 ₁ Is 0.053. Also, the outer diameter D of the cake 12 ₂ Is 300 mm. ₂ Index S for one round of ₂ Is 0.027.
[0036]
That is, if the yarn 12 is pulled out from the cake 12 when the cake 12 is placed on a fixed base, the twist index of the S-type twist generated in the yarn 10 as the yarn 10 is pulled out is 0.053 to 0. .027.
[0037]
On the other hand, the diameter D of the length measuring drum 14 ₀ Is 150 mm, the torsion index Z of the torsion by the length measuring drum 14 is 0.053.
[0038]
Therefore, in order to cause the yarn 10 to be wound around the length measuring drum 14 to have an S-type twist of 0.053, which is the same as the twist index Z, a decrease in the twist index of the yarn 10 (S ₁ -S ₂ ) Needs to be supplemented by the rotation of the rotating body 16. Then, the rotational speed of the rotating body 16 must be increased to compensate for the decrease in the twist index.
[0039]
By controlling the rotation speed of the rotating body 16 as described above as the yarn 10 is drawn, the S-shaped twist having a twist index of 0.053 always occurs in the yarn 10 drawn from the cake 12. On the other hand, the diameter D of the length measuring drum 14 ₀ Is 150 mm, and the yarn 10 is wound so that a Z-shaped twist is generated on the length measuring drum 14. The S-type twist and the Z-type twist are opposite directions as described above.
[0040]
Therefore, the yarn 10 drawn from the length measuring drum 14 is a non-twisted yarn 10 in which the twist has been canceled. A glass cloth is woven using the non-twisted yarn 10 as the yarn 10 for the weft.
[0041]
In the opening process S16, the glass cloth woven in the weaving process S14 is opened. As the fiber opening treatment method, there are an ultrasonic method in which the glass cloth is opened in water under ultrasonic vibration, a pressing method using a rotating cylinder in which the glass cloth is opened by pressing the glass cloth in hot water with a vertically rotating cylindrical body, a glass method. A columnar flow high-pressure water jetting method, in which the columnar flow high-pressure water is sprayed onto the cloth to open the cloth, a vibrating washer method, a ridgeline method, or the like may be applied.
[0042]
In the deoiling step S18, the glass cloth that has passed through the fiber opening processing step S16 is deoiled. Here, the deoiling treatment is to remove a sizing agent or the like adhering to the glass fiber filaments constituting the yarn 10, for example, to heat-treat the glass cloth in a heating furnace or the like.
[0043]
Then, in the surface treatment step S20, the de-oiled glass cloth is impregnated with the coupling agent to obtain a glass cloth for a printed wiring board.
[0044]
Conventionally, the cake 12 is fixed, and the yarn 10 pulled out from the cake 12 by a pull method is wound around the length measuring drum 14 so that a Z-shaped twist is generated. In this way, the measured twist of the yarn 10 is equal to the inner diameter D of the cake 12. ₁ Is the diameter D of the measuring drum 14 ₀ Is the same as the above, but the inside diameter D of the cake 12 is ₁ All the twists could not be eliminated because the yarn became larger as the yarn 10 was pulled out.
[0045]
On the other hand, in the present embodiment, the cake 12 is placed on the rotating body 16. And the inner diameter D of the cake 12 ₁ The rotation speed of the rotating body 16 is controlled such that the S-shaped twist having the same twist index as that of the length measuring drum 14 always occurs in the yarn 10 to be wound around the length measuring drum 14 with the increase of the length. Rotate. Therefore, when the yarn 10 is measured by the length measuring drum 14, the twist generated before being wound around the length measuring drum 14 is canceled when the yarn 10 is pulled out from the length measuring drum 14. That is, the measured yarn 10 for weft has the same non-twist as the yarn 10 constituting the cake 12. If the glass cloth is woven using such a yarn 10, twisting due to length measurement does not occur. Therefore, there is no constraint between the glass fiber filaments due to the twist of the yarn 10, so that the glass fiber is opened when the glass cloth is opened. The fiber can be uniformly opened to the filament unit, and as a result, the thickness of the glass cloth can be reduced.
[0046]
In the method for manufacturing a glass cloth according to the present embodiment, there is a fiber opening processing step S16 after the weaving step S14. For example, if the yarn 10 is opened before weaving, there is a risk that the opened glass fiber filaments will re-bundle during weaving. However, in this embodiment, since the opening process is performed after weaving as described above, the opening can be performed effectively and reliably, and the industrial production is efficient.
[0047]
(Second embodiment)
A second embodiment will be described. In the second embodiment, similarly to the first embodiment, a glass cloth is manufactured according to the manufacturing process of FIG. However, in the weaving step S14, the method of measuring the length so that the measured yarn 10 is not twisted is different from the first embodiment. A method for measuring the length of the yarn 10 in the present embodiment will be described with reference to FIG.
[0048]
As in the case of the first embodiment, the cake 12 is placed on the rotating body 16 such that the winding axis α of the cake 12 substantially coincides with the rotating axis β of the rotating body 16. Inner diameter D before drawing out yarn 10 of cake 12 of FIG. ₁ And outer diameter D ₂ Are, for example, 150 mm and 300 mm as in the first embodiment.
[0049]
The yarn 10 is pulled out from the inside of the cake 12 by a pull method. Here, the yarn 10 is pulled out while rotating the rotating body 16 so as to cancel the S-shaped twist caused by pulling out the yarn 10. The rotating body 16 is controlled as follows so as to cancel the twist of the yarn 10 caused by drawing from the cake 12.
[0050]
The twist of the yarn 10 pulled out from the cake 12 by the pull method is caused by the fact that the yarn 10 is pulled out when the drawing position of the yarn 10 is canceled along the inner periphery of the cake 12 when the yarn 10 is drawn. Does not rotate in the circumferential direction. However, as the yarn 10 is pulled out, the inner diameter D ₁ Is increased, the yarn 10 is pulled out in the radial direction of the cake 12. Therefore, the rotating body 16 controls the yarn 10 to be drawn out in the radial direction without moving in the circumferential direction of the cake 12.
[0051]
More specifically, the rotation direction of the rotating body 16 is the direction in which the Z-shaped twist is generated in the yarn 10 in order to eliminate the S-shaped twist, that is, the rotation of the drawing position P of the yarn 10 in the cake 12 in FIG. It is rotated in the direction (direction of arrow B) opposite to the direction (direction of arrow A). By the way, assuming that the yarn 12 is pulled out from the cake 12 by placing the cake 12 on a fixed base, if the yarn 10 is pulled out from the cake 12, the S-shaped twist generated in the yarn 10 will be caused by the inner diameter D of the cake 12. ₁ Is the outer diameter of D ₂ And the twist index is S ₁ To S ₂ That is, it is reduced from 0.053 to 0.027. Therefore, the rotation speed of the rotating body 16 is controlled so as to be reduced in accordance with such a decrease in the torsion index.
[0052]
The yarn 10 whose twist has been eliminated by the rotation of the rotator 16 is used as the diameter D of the length measuring drum 14 as shown in FIG. ₀ Diameter D almost the same as ₀ Is wound around the first drum 18. The first drum 18 is wound with the yarn 10 so that when the yarn 10 is pulled out from the first drum 18, the yarn 10 has an S-shaped twist.
[0053]
Then, the yarn 10 is pulled out from the first drum 18 and wound around the length measuring drum 14 so that a Z-shaped twist, which is a twist opposite to the S-shaped twist, occurs.
[0054]
Diameter D of first drum 18 ₀ And the diameter D of the measuring drum 14 ₀ And the directions of torsion generated by pulling out from the first drum 18 and the length measuring drum 14 are opposite to each other. Therefore, the torsion caused by being pulled out from the first drum 18 is eliminated when being pulled out from the length measuring drum 14. Therefore, the measured yarn 10 is a non-twisted yarn 10 having no twist.
[0055]
A glass cloth is woven using such a non-twisted yarn 10 as a weft.
[0056]
The glass cloth woven as described above is subjected to opening processing, deoiling processing, and surface treatment in the same manner as in the first embodiment, to obtain a glass cloth for a printed wiring board.
[0057]
In the present embodiment, the yarn 10 is drawn out without rotating in the circumferential direction by rotating the rotating body 16. Therefore, it can be easily determined whether or not the yarn 10 is twisted. The operation and effect of the fact that the yarn 10 measured by the length measuring drum 14 is not twisted are the same as those in the first embodiment. Further, the operation and effect of applying the opening process after weaving are the same as in the case of the first embodiment.
[0058]
(Third embodiment)
A third embodiment will be described. In the third embodiment, similarly to the first embodiment, a glass cloth is manufactured according to the manufacturing process of FIG. However, in the weaving process S14, a method for eliminating the twist of the yarn 10 due to the length measurement is different from that of the first embodiment.
[0059]
In the weaving step S14 in the third embodiment, the length is measured as shown in FIG.
[0060]
First, as shown in FIG. 6, the yarn 10 is pulled out from the cake 12 by a creel method. The diameter D is substantially the same as that of the length measuring drum 14. ₀ Is wound around the second drum 20 having a shape such that an S-shaped twist is generated.
[0061]
Next, the yarn 10 drawn from the second drum 20 is wound so that a Z-shaped twist is generated in the length measuring drum 14, that is, in a direction opposite to the direction wound around the second drum 20.
[0062]
As described above, when the yarn 10 is pulled out from the cake 12 by the creel method, the yarn 10 to be wound on the second drum 20 has no twist. On the other hand, since the second drum 20 is wound so as to generate an S-shaped twist, the yarn 10 drawn from the second drum 20 in the direction of the center axis thereof has an S-shaped twist. On the other hand, the length measuring drum 14 is wound so as to generate a Z-shaped twist. As described above, since the diameter of the length measuring drum 14 and the diameter of the second drum 20 are substantially equal, the twist index of the twist by the second drum 20 and the twist index of the twist by the length measuring drum 14 are the same. Therefore, the twist generated in the yarn 10 to be wound on the length measuring drum 14 is canceled when the yarn 10 is pulled out from the length measuring drum 14. Therefore, the measured yarn 10 is a yarn 10 in which no twist has occurred.
[0063]
Then, using the measured yarn 10 as a weft, a glass cloth is woven using the yarn 10 warped in the warping step S12 as a warp.
[0064]
The glass cloth woven as described above is subjected to fiber opening treatment, deoiling treatment and surface treatment in the same manner as in the first embodiment and the second embodiment to obtain a glass cloth for a printed wiring board.
[0065]
In the present embodiment, the twist of the measured yarn 10 can be easily eliminated by merely preparing the second drum 20 in addition to the length measuring drum 14. The operation and effect of the fact that the yarn 10 measured by the length measuring drum 14 is not twisted are the same as those in the first embodiment. Further, the operation and effect of applying the opening process after weaving are the same as in the case of the first embodiment.
[0066]
In the above-described first to third embodiments, the length measuring drum is wound around the Z-shaped torsion, but the direction is not particularly limited. In the first embodiment, it may be wound so as to generate a twist in a direction opposite to the direction of the twist generated by being pulled out of the cake. In the second and third embodiments, the direction of winding around the second drum may be used. It may be wound in the opposite direction.
[0067]
Further, in the first embodiment, the rotating body is rotated in the direction in which the yarn drawn from the cake causes an S-type twist, and in the second embodiment, the yarn is rotated in the direction in which the Z-type twist is generated in the yarn. However, it is not necessary to limit to these. In the first embodiment, the yarn drawn from the cake is rotated in the direction in which the twist increases, and in the second embodiment, the yarn drawn in the cake is rotated in the direction in which the twist is eliminated.
[0068]
In the first to third embodiments, a yarn composed of fibers having an irregular cross section or a yarn having a circular cross section may be used.
[0069]
Further, the diameter of the first drum in the second embodiment and the diameter of the second drum in the third embodiment are substantially the same as the diameter of the length measuring drum. , At least three times / 1200 mm or less (twist index: 0.06 or less).
[0070]
Further, in the first to third embodiments, the non-twisted yarn 10 is used for both the warp and the weft, but the warp is usually drawn out and warped by the creel system. No twisting occurs when the yarn 10 is pulled out without using the method shown in FIG. Also, as in the embodiment of the present invention, the use of the non-twisted yarn 10 for both the warp and the weft produces a great effect. However, the warp uses a normal twisted yarn, and only the weft is used in the non-twisted yarn 10. The effect can be obtained even if it is implemented.
[0071]
Further, the thickness of the glass cloth is manufactured to be 100 μm or less, but is not necessarily limited to 100 μm or less. In the above embodiment, the thinner the glass cloth is, the more effective it is, and a glass cloth of 30 μm or less can be manufactured.
[0072]
Further, in the above-described first to third embodiments, the fiber opening processing step S16 is introduced between the weaving step S14 and the deoiling step S14. Depending on the required properties of the cloth, it can be introduced after the deoiling step S18 or after the surface treatment step S20.
[0073]
Furthermore, in the first to third embodiments, the length measuring drum 14 has a cylindrical shape, but is not limited to this. For example, the tapered measuring drum 22 may be tapered in the direction in which the yarn is drawn from the measuring drum. In this case, the first drum of the second embodiment and the second drum of the third embodiment have the same shape as the tapered length measuring drum. The shape of the taper is desirably such that the difference in the twist index depending on the winding position of the yarn 10 can be ignored. Here, the case where the difference in the torsion index is negligible is described as an example in which the length is measured using the tapered length measuring drum 22 as in the first embodiment. Even if the rotating body 16 is controlled with respect to the torsion index determined by the diameter on the side of the end portion, the measured twist of the yarn 10 is about 3 times / 1200 mm or less.
[0074]
By making the length measuring drum, the first drum, and the second drum tapered as described above, the yarn 10 can be more smoothly pulled out.
[0075]
FIG. 6 is a process chart showing a method of measuring the length of the yarn 10 when the tapered length measuring drum 22 and the first drum 24 are used in the second embodiment. When the length measuring drum 22 and the first drum 24 are used, they are arranged in the same direction as shown in FIG. This is the same in the case of the third embodiment.
[0076]
【The invention's effect】
According to the present invention, since the glass yarn measured by the length measuring drum is not twisted, the glass yarn constituting the woven glass cloth is not twisted. Therefore, an increase in the thickness due to the twist of the glass yarn constituting the glass cloth does not occur. Therefore, the glass cloth can be made thin.
[0077]
In addition, since the fiber cloth is woven by using the glass yarn whose twist has been eliminated as described above, the fiber cloth can be spread uniformly down to the glass fiber filament unit, and the glass cloth can be further thinned.
[Brief description of the drawings]
FIG. 1 is a process chart showing one embodiment of a method for manufacturing a glass cloth to which the present invention is applied.
FIG. 2 is a diagram showing one technique for extracting yarn from a cake.
FIG. 3 is a diagram showing one method of setting a state in which a yarn drawn from a length measuring drum has no twist.
FIG. 4 is a diagram showing another method for setting a state in which the yarn drawn from the length measuring drum has no twist.
FIG. 5 is a diagram showing still another method for setting a state in which the yarn drawn from the length measuring drum has no twist.
FIG. 6 is a process diagram in a case where length measurement is performed using a tapered length measurement drum and a first drum in the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Glass yarn, 12 ... Glass cake, 14 ... Length measuring drum, 16 ... Rotating body, 18 ... First drum, 20 ... Second drum, 22 ... Tapered length measuring drum, 24 ... Tapered first drum .

Claims (5)

A method of manufacturing a glass cloth using a glass yarn measured by a length measuring drum,
The glass cake is placed on a rotating body such that the winding axis of the glass cake is parallel to the rotating axis of the rotating body, and the twist is opposite to the twist caused by drawing out the glass yarn from the glass cake in a substantially winding axis direction. The glass yarn is wound around the length measuring drum so that a twist is generated, the length is measured, and a glass cloth is woven using the measured length of the glass yarn,
The glass yarn to be wound around the length measuring drum has a twist that is canceled according to the length of the glass yarn so that the twist is canceled by winding the length around the length measuring drum. A method of controlling the rotation speed of the rotating body in accordance with the change of the glass cloth. 2. The method according to claim 1, wherein the glass yarn is drawn out from the inside of the glass cake, and a rotation speed of the rotating body is controlled so as to increase in accordance with a drawing amount of the glass yarn. 3. . A method of manufacturing a glass cloth using a glass yarn measured by a length measuring drum,
Place the glass cake on a rotating body such that the winding axis of the glass cake is parallel to the rotating axis of the rotating body,
Pulling out the glass yarn in a substantially winding axis direction from the glass cake, rotating the rotating body in a direction opposite to a rotation direction of a drawing position of the glass yarn in the glass cake, and generating the glass yarn in accordance with the drawing of the glass yarn. The rotation speed of the rotating body is controlled so as to cancel the twist in response to the change in the twist of the glass yarn, and the glass yarn whose twist has been canceled by the rotation of the rotating body is wound around a first drum, and The glass yarn wound around one drum is wound around the length measuring drum so that a twist opposite to the twist generated in the first drum occurs, and the length is measured, and the glass cloth is used to measure the glass cloth. A method for producing a glass cloth, which comprises weaving. A method for producing a glass cloth using a glass yarn measured by a length measuring drum,
The glass cake is rotated, the glass yarn is pulled out from the outside of the glass cake in an outer circumferential direction, and is wound around a second drum. The glass yarn wound around the second drum is wound around the length measuring drum. A method of manufacturing a glass cloth, comprising: wrapping a glass cloth so as to generate a twist opposite to the twist generated in the above, measuring the length, and weaving the glass cloth using the measured glass yarn. A method for producing a glass cloth, further comprising subjecting the glass cloth woven according to any one of claims 1 to 4 to a fiber opening treatment.

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