JP7448146B2 - Cake and glass yarn packaging - Google Patents

Description

The present invention relates to cakes and glass yarn packages.

Glass yarn is made by twisting together a large number of single glass fibers (filaments) into a thread. Glass yarn has excellent properties such as electrical insulation, dimensional stability, heat resistance, chemical resistance, and tensile strength, so it is used as raw material yarn for glass cloth, glass tape, glass sleeves, rubber reinforcement cord, etc. There is. One of the applications of glass cloth is printed wiring boards, and it greatly affects the quality of printed wiring boards. Glass cloth for printed wiring boards has become thinner, and the glass yarn used as the raw material has also become thinner (for example, about 0.3 to 5 tex).

A glass yarn package around which glass yarn is wound is manufactured through a spinning process and a twisting process as described below.
(1-1) Spinning process Glass raw materials are melted in a glass melting furnace and drawn out as a plurality of long glass fibers from a nozzle, and a sizing agent is applied to the plurality of long glass fibers to make them bundled into glass strands. Then, a collet equipped with a cylindrical winding tube is rotated to wind the glass strand onto the winding tube, and a cake (a tube formed by winding the strand immediately after being made into fiber from the bushing in the spinning process) is rolled up onto the winding tube. A mass of thread wound into a shape).
(1-2) Twisting process Glass strands are pulled out from the cake, twisted using a twisting machine to form glass yarn, and wound around a cylindrical bobbin to form a glass yarn package.

The number of glass strands wound into a cake largely depends on the nozzle temperature in the glass melting furnace, the glass liquid level height (glass head), and the winding speed by the collet. That is, if the nozzle temperature is raised, the amount of molten glass discharged increases, and therefore the diameter of the filaments constituting the glass strand and the number of the glass strand become larger. Furthermore, by increasing the height of the glass head, the extrusion pressure when the glass is discharged from the nozzle of the melting furnace increases, the amount of glass discharged increases, and the glass count increases. On the other hand, as the winding speed by the collet increases, the diameter of the filaments constituting the glass strand and the count of the glass strand decrease. Conventionally, it is common technical knowledge that the nozzle temperature, the winding speed of the glass head and the glass strand are controlled to be constant. That is, it is common technical knowledge that the number of glass strands in a cake should be constant from the beginning of winding to the end of winding.

For example, as a winding device for glass strands as described above, fibers are traversed by rotation of a spiral wire and reciprocating motion relative to a collet in the axial direction, and while rotating the collet, a package wrapped around the collet is In a device in which the fiber is wound so that both ends are tapered, the rotation speed of the collet and the winding speed of the fiber are approximately constant depending on the reciprocating position of the spiral wire relative to the collet that is reciprocating. A fiber winding device is known that controls the winding in this manner (see, for example, Patent Document 1). According to this fiber winding device, the spinning speed can be kept constant at all locations even when the package is traversed so that both ends are tapered and thickened. It is said that it will be possible to provide high-quality filaments with a constant filament diameter even when rolled into cakes, etc.

Japanese Patent Application Publication No. 11-49426

In the spinning process for producing a cake, the glass strand is wound up while being sprayed with water to prevent fluff from being mixed into the cake. In addition, since the sizing agent applied to the glass strands is water-based, the cake immediately after spinning contains a large amount of water. The obtained cake is then dried to volatilize a certain amount of moisture before being subjected to the twisting process, where the sizing agent applied to the glass strands tends to migrate and form a film on the surface of the dried cake (at the end of the cake winding). , adjacent glass strands on the surface of the cake are likely to be partially joined together by the film.

When setting the dried cake in the twisting machine in the twisting process, the worker pulls out the glass strands from the surface (outer layer side) of the cake, so-called opening, and passes the pulled out glass strands through the guide of the twisting machine. The yarn is passed through a traveler set in the ring of a twisting machine and wound multiple times around a bobbin, which is the winding core of the glass yarn package, and the bobbin is set on the spindle of a twisting machine and twisted to form a glass yarn package. In this case, the glass strand at the end of the winding of the cake that is drawn out corresponds in position to the glass yarn at the beginning of winding in the glass yarn package.

Here, the present inventors discovered that when the glass strands are taken out from the surface of the cake, as described above, the adjoining glass strands on the cake surface develop a film of the sizing agent applied to the glass strands. A phenomenon in which some of the plurality of filaments constituting the glass strand to be drawn out joins the glass strand that is still wound around the cake, and some of the filaments are torn and lost from the glass strand to be drawn out (herein referred to as This phenomenon is sometimes expressed as "lagging threads"). In particular, it was learned that the occurrence of lagging threads is more likely to occur when the glass strand count is small. . The present inventors have discovered that once a delayed thread occurs during cake unwinding, and if unwinding is continued, the number of missing filaments in the led out glass strand increases, and eventually the strand breaks. It has been learned that there is a problem in that a clue in the cake cannot be found, making it impossible to take out the cake, forcing the cake to be discarded, and resulting in failure to take out the cake.

In addition, the present inventors discovered that in the yarn twisting process, when the number of glass strands of the cake set in the yarn twisting machine becomes smaller, the operator needs relatively more time to set the cake on the traveler of the yarn twisting machine, and work efficiency decreases. I learned that.

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned problems, and provides a technology related to a cake that contributes to reducing the occurrence of poor lead-out and improving the workability of setting it in a twisting machine traveler, as well as producing a glass yarn package using the cake. The main challenge is to provide

The inventors of the present invention conducted extensive studies to solve the above problem, and found that conventionally, as disclosed in Patent Document 1, it is common general knowledge that the filament diameter and filament count are kept constant over the entire length of the glass strand wound around the cake. However, for example, in cake manufacturing, the winding speed is reduced at the timing of winding the strand at the end of winding (corresponding to the outermost layer), so that the count at the end of winding of the glass strand is lower than that of the glass strand. It has been found that the above problem can be solved by making the total length larger than the average count.

That is, the present invention provides inventions of the following aspects.
Item 1. A cake in which a glass strand is wound, wherein a count Tc1 at the end of winding of the glass strand in the cake is larger than an average count Tc of the entire length of the glass strand in the cake.
Item 2. Item 2. The cake according to item 1, wherein the ratio of the length Lc1 of the glass strand at the end of winding to the total length Lc of the glass strand (Lc1/Lc×100) is 0.001 to 10%.
Item 3. Item 3. The cake according to item 1 or 2, wherein the ratio (Tc1/Tc) of the count Tc1 of the winding end portion of the glass strand to the average count Tc of the entire length of the glass strand is 1.1 to 5.0.
Item 4. The cake according to any one of items 1 to 3, wherein the average count Tc is 0.3 to 4.5 tex.
Item 5. A glass yarn package in which a glass yarn is wound, wherein a count Tp1 of a winding start portion of the glass yarn in the glass yarn package is larger than an average count Tp of the entire length of the glass yarn in the yarn package. Yarn package.
Item 6. Item 5. The glass yarn package according to Item 5, wherein a ratio (Lp1/Lp×100) of the length Lp1 of the glass yarn at the winding start portion to the total length Lp of the glass yarn is 0.001 to 10%.
Section 7. Item 7. The glass yarn package according to item 5 or 6, wherein the ratio (Tp1/Tp) of the count Tp1 at the winding start portion of the glass yarn to the average count Tp of the entire length of the glass yarn is 1.1 to 5.0. .
Section 8. The glass yarn package according to any one of items 5 to 7, wherein the average count Tp is 0.3 to 4.5 tex.

According to the cake of the present invention, it is a cake in which a glass strand is wound, and the count Tc1 of the winding end portion of the glass strand in the cake is greater than the average count Tc of the entire length of the glass strand in the cake. Since the glass strand is large, for example, even when the glass strand has a small count, it can contribute to reducing the occurrence of poor lead-out and improving the workability of setting it in the twisting machine traveler.

Further, according to the glass yarn package of the present invention, it is obtained by twisting using the above cake, and when the cake is set in the twisting machine traveler, the glass yarn package corresponds in position to the glass strand at the end of winding of the cake. Since the average count Tp1 of the glass yarn at the beginning of winding is larger than the average count Tp of the entire length of the glass yarn in the yarn package, the glass yarn at the beginning of winding is more likely to be set on the bobbin more reliably. It can contribute to improving the quality of glass yarn packages.

It is a schematic diagram explaining an example of the manufacturing method of the cake of preferable embodiment in a spinning process. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, showing the cake pulled out from the collet. It is a schematic diagram explaining an example of the manufacturing method of the glass yarn package of preferable embodiment in a twisting process.

1. Cake The cake of the present invention is a cake in which a glass strand is wound, and the number Tc1 of the winding end portion of the glass strand in the cake is larger than the average number Tc of the entire length of the glass strand in the cake. . Hereinafter, preferred embodiments of the cake of the present invention will be described in detail.

<Preferred embodiment of the cake of the present invention>
The cake of the present invention has glass strands wrapped around it. A glass strand is a fiber bundle made by directly aligning and converging a plurality of glass filaments pulled out from a glass melting furnace nozzle.

The glass material constituting the glass filament is not particularly limited. For example, examples of the glass composition include glass materials that are known glass compositions, such as E glass, T glass, S glass, D glass, NE glass, L glass, C glass, or AR glass. . Also, a low dielectric glass composition having a dielectric constant of 5 or less and a dielectric loss tangent of 5×10 ⁻⁴ or less at a frequency of 1 MHz at room temperature, or 40≦SiO ₂ ≦60, 15≦ expressed in mass % Glass compositions containing B ₂ O ₃ ≦35 and 10≦Al ₂ O ₃ ≦20 may also be mentioned.

FIG. 1 is a schematic diagram illustrating an example of a method for producing a cake 1 according to a preferred embodiment in a spinning process. In addition, below, description may be made according to the directions shown in FIG. 1, that is, top, bottom, right, and left. Although the description will be made according to these directions, the present invention is not limited to these directions. The spinning device of a preferred embodiment includes a glass melting furnace 5 that melts the glass material, and a plurality of nozzles 6 that are included in the glass melting furnace 5 and that discharge molten glass from the glass melting furnace 5 to form glass filaments 4. , an applicator 7 that applies a focusing agent 8 to the glass filament 4, a gathering shoe 9 that directly aligns and collects the glass filaments 4 to form a glass strand 2, and a gathering shoe 9 that directly aligns and collects the glass filaments 4 to form a glass strand 2; It includes a traverse (not shown) for winding up the glass strand 2 and a collet 10 for winding up the glass strand 2. 2 is a cross-sectional view taken along the line AA in FIG. 1, and is a diagram showing the cross-sectional shape of the cake 1 pulled out from the collet 10. In FIGS. 1 and 2, a cake 1 includes a cake bobbin 3 and a glass strand 2 wound around the cake bobbin 3.

In FIG. 1, a cake bobbin 3 has a cylindrical shape, and is inserted and set into a collet 10 having a cylindrical outer shape. As the collet 10 rotates in the circumferential direction, the cake bobbin 3 inserted into the collet 10 also rotates in the circumferential direction, and the glass strand 2 is wound around the cake bobbin 3. Here, as described above, the number of the glass strand 2 depends on the temperature of the nozzle 6, the glass head, and the winding speed by the collet 10. For example, if the rotation speed of the collet 10 is reduced while controlling the temperature of the nozzle 6 and the glass head to be constant, the winding speed of the glass strand 2 will be reduced while the discharge amount of molten glass remains the same. Number 2 will be larger.

As shown in FIG. 1 etc., in a preferred embodiment, as the glass strand 2 is wound around the cake bobbin 3 in the spinning process, the glass strand 2 is sequentially deposited on the cake bobbin 3, and the winding section around which the glass strand 2 is wound is formed. The outer diameter increases, and when a predetermined amount of winding is reached, winding is completed and cake 1 is obtained. In a preferred embodiment, the temperature of the nozzle 6 and the rotational speed of the glass head and collet 10 are set so that the number of the glass strands 2 is constant from the beginning to the end of the winding. be done. Then, the rotational speed of the collet 10 is reduced from the time when the winding end portion of the glass strand 2 is reached, and the count Tc1 at the winding end portion of the glass strand 2 can be made larger than the predetermined count. According to the cake 1 of the present invention, it is a cake in which the glass strands 2 are wound, and the count Tc1 of the winding end portion of the glass strands 2 in the cake is such that the count Tc1 of the glass strands 2 in the cake is Since it is larger than the average count Tc of the entire length, for example, even if the count of the glass strand 2 is small, it can contribute to reducing the occurrence of lead-out defects and improving the workability of setting it in the twisting machine traveler. In addition, in the cake 1 of the present invention, it is sufficient that the count Tc1 of the winding end portion of the glass strand 2 in the cake 1 is larger than the average count Tc of the entire length of the glass strand 2 in the cake; Other than that, the strand 2 may include a portion where the count is higher than Tc, or may not include the portion.

In the cake 1 of the present invention, the length Lc1 of the glass strand 2 at the end of winding, which has a count Tc1 larger than the average count Tc of the total length Lc of the glass strand 2, is a length that can reduce the occurrence of poor lead-out. If so, there are no particular restrictions. For example, regarding the above Lc1, the ratio (Lc1/Lc×100) of the length Lc1 of the glass strand 2 at the end of winding to the total length Lc of the glass strand 2 wound around the cake 1 is 0.001 to 10. %, preferably 0.05 to 10%. Furthermore, the upper limit of the ratio (Lc1/Lc×100) may be 5%, 1%, 0.2%, 0.1% or 0.01%. Further, the specific length of Lc is, for example, 40 km to 400 km, preferably 40 to 300 km. Further, the specific length of Lc1 is 0.002 to 40 km, preferably 0.02 to 30 km. Furthermore, Lc1 can be set to 0.002 to 3 km, and the upper limit of Lc1 can also be 1 km, 0.2 km, 0.1 km, or 0.01 km.

In the cake 1 of the present invention, the number Tc1 of the glass strand 2 at the winding end portion having a number larger than the average number Tc of the entire length of the glass strand 2 is not particularly limited as long as it is larger than the above Tc. For example, regarding Tc1, the ratio (Tc1/Tc) of the count Tc1 at the end of winding of the glass strand 2 to the average count Tc of the entire length of the glass strand 2 is 1.1 to 5.0. In addition, from the viewpoint of making the effects of the present invention even more remarkable, specific examples of the above-mentioned Tc include 0.3 to 4.5 tex, preferably 0.3 to 2.5 tex, and 0.3 to 4.5 tex, preferably 0.3 to 2.5 tex, and .8 to 2 tex is more preferred. Further, from the same viewpoint, specific examples of the Tc1 include 0.33 to 22.5 tex, preferably 0.33 to 12.5 tex, and 0.88 to 10 tex. In addition, in the present invention, the count is measured according to JIS R 3420:2013 7.1. The above Tc can be determined by sampling the glass strand 2 from the cake 1 at 20 locations at equal intervals along the entire length of the glass strand 2, in 5-100 m increments, preferably in 10 m increments, and more preferably in 5 m increments. The average value of the counts at 20 locations is defined as Tc. For example, when the total length Lc is 10 km, first, 5 m of glass strand 2 is sampled from the end of winding (0 m point). Next, the glass strand 2 was unwound for 495 m, then 5 m was sampled, and this was repeated the remaining 18 times to measure the count at 20 locations. 10000m/20=500m, and the sum of 5m length to collect + 495m length to unwind is the above 500m.) Tc1 is a sample of 5 to 100 m, preferably 10 m, more preferably 5 m from the end of winding within the range of length Lc1, and the measured count is defined as Tc1.

In the cake 1 of the present invention, the average diameter of the filaments constituting the glass strand 2 is not particularly limited. For example, the filament average diameter Dc of the glass strand 2 in the portion other than the winding end portion where the glass strand 2 having the winding count Tc1 which is larger than the average winding count Tc of the entire length of the glass strand 2 is The ratio (Dc1/Dc) of the filament average diameter Dc1 of the glass strand 2 is 1.05 to 2.25. Further, for example, the effect of the present invention can be made even more remarkable by setting the filament average diameter Dc at a portion other than the winding end portion where the glass strand 2 having a count Tc1 larger than the average count Tc of the entire length of the glass strand 2 is wound. From the viewpoint of achieving the desired thickness, the thickness is preferably 3 to 5 μm, and preferably 3 to 4.5 μm. Further, from the same viewpoint, the filament average diameter Dc1 of the glass strand 2 at the winding end portion having a count Tc1 larger than the average count Tc of the entire length of the glass strand 2 is 3.2 to 11.3 μm, and 4 to Preferably, the thickness is 8 μm. In the present invention, the filament average diameter is determined by embedding a glass thread such as a glass strand in an epoxy resin (trade name 3091, manufactured by Marumoto Struers Co., Ltd.), curing it, and polishing it to the extent that the cross section of the glass thread can be observed. Observation and measurement are performed using a SEM (trade name JSM-6390A manufactured by JEOL Ltd.) at a magnification of 3000 times. The glass thread (glass strand) is sampled from all locations, the diameters of all the filaments of the glass thread are measured, and the average value is calculated, which is taken as the average filament diameter of the glass thread.

In the cake 1 of the present invention, the number of filaments constituting the glass strand 2 is not particularly limited. For example, the number of filaments of the glass strand 2 in a portion other than the winding end portion where the glass strand 2 having a count Tc1 larger than the average count Tc of the entire length of the glass strand 2 is wound, and the glass strand at the winding end portion having the winding count Tc1 The number of filaments in the two cases can be the same. Further, the number of filaments constituting the glass strand 2 is 25 to 100.

2. Glass Yarn Package The glass yarn package of the present invention is a glass yarn package in which glass yarn is wound, and the count Tp1 of the winding start portion of the glass yarn in the glass yarn package is the same as that of the glass yarn in the yarn package. It is larger than the average count Tp of the entire length of the yarn. Hereinafter, preferred embodiments of the cake of the present invention will be described in detail.

<Preferred embodiment of the glass yarn package of the present invention>
The glass yarn package of the present invention is wound with glass yarn. Glass yarn is made by twisting together a large number of single glass fibers (filaments) into a thread.

In the glass yarn, the glass material constituting the glass filament is the same as the glass strand described above.

FIG. 3 is a schematic diagram illustrating an example of a method for manufacturing a glass yarn package 11 according to a preferred embodiment in a twisting process. In FIG. 3, (A) is a diagram showing how the glass strand 2 at the end of the winding of the cake 1 is pulled out and twisted to form the glass yarn 12 and wound as the beginning of the winding of the glass yarn package 11. Figure (B) shows how the glass strand 2 at the beginning of winding of the cake 1 is pulled out and twisted to form glass yarn 12 and wound as the end of winding of the glass yarn package 11. A preferred embodiment of the twisting device includes a creel (not shown) to which the above-described cake 1 used for yarn feeding is attached, which rotates the cake 1 in the circumferential direction and draws out the glass strand 2 according to the rotational speed; A guide 14 that adjusts ballooning of the glass strand 2, a ring 15 that reciprocates in the vertical direction (in the axial direction of the glass yarn package bobbin 13), a traveler (not shown) rotatably held by the ring 15, and a glass yarn package bobbin 13. A spindle (not shown) is inserted into the space, fixes and rotates the glass yarn package bobbin 13, and winds the glass yarn 12 onto the glass yarn package bobbin 13.

As shown in FIG. 3(A), the winding end portion of the glass strand 2 having a count Tc1 larger than the average count Tc of the entire length of the glass strand 2 of the cake 1 of the present invention is the glass yarn 12 in the glass yarn package 11. Positionally corresponds to the beginning of the winding. That is, the glass yarn package 11 of the present invention is obtained by twisting the cake 1 of the present invention, and when the cake 1 is set on the twister traveler, the glass strands 2 at the end of winding of the cake 1 are twisted. Since the count Tp1 of the glass yarn 12 at the beginning of winding, which corresponds to the position, is larger than the average count Tp of the entire length of the glass yarn 12 in the yarn package 11, the glass yarn 12 at the beginning of winding is more reliable. This makes it easier to set the glass yarn package bobbin 13 on the glass yarn package bobbin 13, which contributes to improving the quality of the glass yarn package 11, such as reducing fuzz. In addition, in the glass yarn package 11 of the present invention, if the count Tp1 of the winding start portion of the glass yarn 12 in the glass yarn package 11 is larger than the average count Tp of the entire length of the glass yarn 12 in the glass yarn package 11. Often, the glass yarn 12 may include a portion where the count is higher than Tp other than the winding start portion, or may not include the portion.

In the glass yarn package 11 of the present invention, the length Lp1 of the glass yarn 12 at the winding start portion, which has a count Tp1 larger than the average count Tp of the entire length Lp of the glass yarn 12, is not particularly limited. For example, regarding Lp1, the ratio (Lp1/Lp×100) of the length Lp1 of the glass yarn 11 at the winding start portion to the total length Lp of the glass yarn 11 wound around the glass yarn package 11 is 0.001 to 10%. and preferably 0.05 to 10%. Furthermore, the upper limit of the ratio (Lp1/Lp×100) may be 5%, 1%, 0.2%, 0.1% or 0.01%. Further, the specific length of Lp is, for example, 40 km to 400 km, preferably 40 to 300 km. Further, the specific length of Lp1 is 0.002 to 40 km, preferably 0.02 to 30 km. Further, Lp1 can be set to 0.002 to 3 km, and the upper limit of Lp1 can also be set to 1 km, 0.2 km, 0.1 km, or 0.01 km.

In the glass yarn package 11 of the present invention, the count Tp1 of the glass yarn 12 at the winding start portion, which has a count Tp1 larger than the average count Tp of the entire length of the glass yarn 12, is not particularly limited as long as it is larger than the above Tp. For example, regarding Tp1, the ratio (Tp1/Tp) of the count Tp1 of the winding start portion of the glass yarn 12 to the average count Tp of the entire length of the glass yarn 12 is 1.1 to 5.0. Further, from the viewpoint of making the effects of the present invention even more remarkable, specific examples of the above-mentioned Tp include 0.3 to 4.5 tex, preferably 0.3 to 2.5 tex, and 0.3 to 4.5 tex, preferably 0.3 to 2.5 tex, and .8 to 2 tex is more preferred. Further, from the same point of view, specific examples of the Tp1 include 0.33 to 22.5 tex, preferably 0.33 to 12.5 tex, and 0.88 to 10 tex. In addition, in the present invention, the count is measured according to JIS R 3420:2013 7.1. The above Tp is determined by sampling the glass yarn 12 from the glass yarn package at 20 locations at equal intervals along the entire length of the glass yarn 12, in 5 to 100 m increments, preferably in 10 m increments, and more preferably in 5 m increments. is measured, and the average value of the counts at 20 locations is defined as Tp. For example, when the total length Lp is 10 km, first, 5 m of glass yarn 12 is collected from the end of winding. Next, after unwinding 495 m of glass yarn 12, 5 m of glass yarn was taken, and this was repeated the remaining 18 times to measure the count at 20 locations. 10000m/20=500m, and the sum of 5m length to collect + 495m length to unwind is the above 500m.) Tp1 is a sample of 5 to 100 m, preferably 10 m, more preferably 5 m from the beginning of winding within the range of length Lp1, and the measured count is defined as Tp1.

In the yarn package 11 of the present invention, the average diameter of the filaments constituting the glass yarn 12 is not particularly limited. For example, the filament average diameter Dp of the glass yarn 12 in a portion other than the winding start portion where the glass yarn 12 having a count Tp1 larger than the average count Tp of the entire length of the glass yarn 12 is wound, It is mentioned that the ratio (Dp1/Dp) of the filament average diameter Dp1 of the glass yarn 12 of the portion is 1.1 to 5.0. Further, for example, the effect of the present invention can be made even more noticeable by setting the filament average diameter Dp at a portion other than the winding start portion where the glass yarn 12 having a count Tp1 larger than the average count Tp of the entire length of the glass yarn 12 is wound. From the viewpoint of achieving the desired thickness, the thickness is preferably 3 to 5 μm, and preferably 3 to 4.5 μm. Further, from the same viewpoint, the filament average diameter Dp1 of the glass yarn at the winding end portion having a count Tp1 larger than the average count Tp of the entire length of the glass yarn 12 is 3.2 to 11.3 μm, and 4 to 8 μm. are preferred.

In the yarn package 11 of the present invention, the number of filaments constituting the glass yarn 12 is not particularly limited. For example, the number of filaments of the glass yarn 12 in a portion other than the winding start portion where the glass yarn 12 having a count Tp1 larger than the average count Tp of the entire length of the glass yarn 12 is wound, and the number of filaments in the winding start portion having a count Tp1. The number of filaments in the glass yarn 12 can be the same. Furthermore, the number of filaments constituting the glass yarn 12 is 25 to 100.

In the yarn package 11 of the present invention, the number of twists of the glass yarn 12 is not particularly limited, but may be, for example, 0 to 1.5 twists/25 mm, preferably 0.3 to 1.0 twists/25 mm. The direction of twist may be either the S direction or the Z direction.

The use of the yarn package 11 of the present invention is not particularly limited. In particular, as glass cloth for printed wiring boards has become thinner, the raw material glass yarn has also become lower in count (for example, about 0.3 to 5 tex), and the lower the count of glass yarn 12, the faster the winding. Considering that it becomes difficult for the glass yarn at the beginning to be set on the bobbin more reliably, and problems such as the generation of fuzz, which is a problem as a glass cloth for printed wiring boards, are likely to occur, the yarn package 11 of the present invention is printed. It is preferable to use it for a glass cloth for wiring boards because the effects of the present invention can be exhibited even more markedly. Further, when weaving glass cloth using the yarn package 11 of the present invention, the glass yarn 12 at the beginning of winding, which has a count Tp1 larger than the average count Tp of the entire length of the glass yarn 12, is not included in the glass cloth. , preferably weaving.

The present invention will be explained in detail below by showing Examples and Comparative Examples. However, the present invention is not limited to the examples.

<Example 1>
1. Manufacture of Cake A cake was manufactured using the spinning apparatus described above as the preferred embodiment shown in FIG. Specifically, E glass was used as the glass material, and the glass material was melted in the glass melting furnace 5 and discharged from the nozzle 6 to form the filament 4. A sizing agent 8 is applied to the filament 4 with an applicator 7, 40 filaments are converged with a gathering shoe 9 to form a glass strand 2, a collet 10 into which a cake bobbin 3 is inserted is rotated in the circumferential direction, and traversing is performed while traversing. A cake 1 was manufactured by winding the glass strand 2 around a cake bobbin 3. At this time, the average count Tc of the entire length of the glass strand 2 is 1.1 tex from the start of winding the glass strand 2 (0 m from the start of winding) to the end of winding (from the start of winding to 199.825 km). The temperature of the nozzle 6 and the rotation speed of the glass head and collet 10 are adjusted so that the spinning speed is adjusted so that the rotation speed of the collet 10 is adjusted continuously from the 199.825 km point while keeping the temperature of the nozzle 6 and the glass head as they are. was reduced to 2/5 times the size and rolled to 0.175 km to form Cake 1. The obtained cake 1 has an average count Tc of the entire length of the glass strand 2 of 1.1 tex, a total length Lc of 200 km, a count Tc1 of the end of the winding of the glass strand 2 of 2.75 tex, and an average count Tc of the end of the winding of the glass strand 2 of 2.75 tex. The length Lc1 of the glass strand 2 is 0.175 km, the ratio of the length Lc1 of the glass strand 2 at the end of winding to the total length Lc of the glass strand 2 (Lc1/Lc×100) is 0.088%, the glass strand 2 The ratio (Tc1/Tc) of the count Tc1 at the end of winding of the glass strand 2 to the average count Tc over the entire length of the glass strand 2 was 2.5. Table 1 shows the physical properties.

In addition, in the above cake 1, Tc is determined by sampling 20 points of 5 m each at intervals of 10,000 m from the end of winding the glass strand 2 (200 km from the start of winding, 0 m from the end of winding) and measuring the count at each of the 20 points. The average value of the count was defined as Tc. Specifically, 5 m of glass strand 2 was sampled from the end of winding (0 m point from the end of winding). Next, the glass strand 2 was unwound for 9995 m, and then 5 m was sampled. This was repeated the remaining 18 times to measure the count at 20 locations, and the average value of the count at the 20 locations was defined as Tc. Moreover, Tc1 was sampled from 5 m from the end of winding of the strand 2 (0 m point), and the measured count was defined as Tc1.

2. Evaluation of opening 1000 cakes 1 manufactured above were prepared, each was dried for 24 hours at a temperature of 20°C and a humidity of 50%, and the strands 2 at the end of rolling of the 1000 cakes were opened by a skilled worker. The number of cakes with a defective lead, in which the lead could not be found due to the occurrence of delayed threads, etc., was counted, and the defective lead rate was calculated. As a result, the defective rate was 0.7%. The results are shown in Table 1.

3. Manufacture of Glass Yarn Package One hundred of the above-described cakes 1 were prepared, and glass yarn packages 11 were manufactured using the twisting machine described above as a preferred embodiment shown in FIG. Cake 1 was placed on the creel.

3-1. Evaluation of workability of yarn preparation work A skilled worker pulls out the glass strand 2 at the end of the winding of the cake 1, passes it through the guide 14, wraps it around the cylindrical glass yarn package bobbin 13 multiple times, and sets it on the spindle. Preparation work for manufacturing the glass yarn package 11 was carried out by passing the glass strand between the guide 14 and the portion wound around the bobbin 13 through a conical traveler attached to the ring 15. This was done for 100 cakes 1, the time required to set all 100 cakes was totaled, and the time was divided by 100 to calculate the average working time required to set each cake 1. As a result, the average working time was 32 seconds. The results are shown in Table 1.

3-2. Manufacture of glass yarn package 11 For the yarn that has been subjected to the above twisting preparation work, twist the yarn by adjusting the rotational speed of the creel and the rotational speed of the spindle so that the number of twists is 0.5 (twists/25mm), A glass yarn package 11 was manufactured. In the obtained glass yarn package 11, the average count Tp of the entire length of the glass yarn 12 is 1.1 tex, the total length Lp is 175 km, the count Tp1 of the glass yarn 12 at the beginning of winding is 2.75 tex, and the average count Tp of the entire length of the glass yarn 12 is 2.75 tex. The length Lp1 of the glass yarn 12 at the part is 0.175 km, the ratio of the length Lp1 of the glass yarn 12 at the beginning of winding to the total length Lp of the glass yarn 12 (Lp1/Lp×100) is 0.1%, and the glass The ratio (Tp1/Tp) of the count Tp1 of the winding start portion of the glass yarn 12 to the average count Tp of the entire length of the yarn 12 was 2.5.

In addition, in the above-mentioned yarn package 11, Tp was determined by sampling 20 points of 5 m each from the end of winding of the yarn 12 every 8750 m, measuring the count at each point, and taking the average value of the counts at 20 points as Tp. Specifically, 5 m of the glass yarn 12 was sampled from the end of winding (0 m point from the end of winding). Next, 8,745 m of the glass yarn 12 was unwound, and 5 m of the yarn was sampled. This was repeated 18 times to measure the count at 20 locations, and the average value of the counts at the 20 locations was defined as Tp. Further, Tp1 was obtained by sampling 5 m from the winding start of the yarn 12 (0 m point from the winding start), and the measured count was defined as Tp1.

In each of the 100 glass yarn packages 11 obtained, the glass yarn 12 at the beginning of winding is more securely set in the bobbin 13, and there is less fuzz, making it suitable for use in glass cloth for printed wiring boards. The quality was okay.

<Example 2>
1. Manufacture of Cake A cake was manufactured using the spinning apparatus described above as the preferred embodiment shown in FIG. Specifically, E glass was used as the glass material, and the glass material was melted in the glass melting furnace 5 and discharged from the nozzle 6 to form the filament 4. A sizing agent 8 is applied to the filament 4 with an applicator 7, 40 filaments are converged with a gathering shoe 9 to form a glass strand 2, a collet 10 into which a cake bobbin 3 is inserted is rotated in the circumferential direction, and traversing is performed while traversing. A cake 1 was manufactured by winding the glass strand 2 around a cake bobbin 3. At this time, the average count Tc of the entire length of the glass strand 2 is 1.1 tex from the start of winding the glass strand 2 (0 m from the start of winding) to the end of winding (from the start of winding to 199.99125 km). The temperature of the nozzle 6 and the rotational speed of the glass head and collet 10 are adjusted so that the spinning is performed, and from the 199.99125 km point onwards, the rotational speed of the collet 10 is adjusted while keeping the temperature of the nozzle 6 and the glass head as they are. was reduced to 2/5 times the size and rolled to a length of 0.00875 km to form cake 1. The obtained cake 1 has an average count Tc of the entire length of the glass strand 2 of 1.1 tex, a total length Lc of 200 km, a count Tc1 of the end of the winding of the glass strand 2 of 2.75 tex, and an average count Tc of the end of the winding of the glass strand 2 of 2.75 tex. The length Lc1 of the glass strand 2 is 0.00875 km, the ratio of the length Lc1 of the glass strand 2 at the end of winding to the total length Lc of the glass strand 2 (Lc1/Lc×100) is 0.004%, the glass strand 2 The ratio (Tc1/Tc) of the count Tc1 at the end of winding of the glass strand 2 to the average count Tc over the entire length of the glass strand 2 was 2.5. Table 1 shows the physical properties, etc.

In addition, in the above cake 1, Tc is determined by sampling 20 points of 5 m each at intervals of 10,000 m from the end of winding the glass strand 2 (200 km from the start of winding, 0 m from the end of winding) and measuring the count at each of the 20 points. The average value of the count was defined as Tc. Specifically, 5 m of glass strand 2 was sampled from the end of winding (0 m point from the end of winding). Next, the glass strand 2 was unwound for 9995 m, and then 5 m was sampled. This was repeated the remaining 18 times to measure the count at 20 locations, and the average value of the count at the 20 locations was defined as Tc. Moreover, Tc1 was sampled from 5 m from the end of winding of the strand 2 (0 m point), and the measured count was defined as Tc1.

2. Evaluation of opening 1,000 of the above cakes were prepared, each was dried for 24 hours at a temperature of 20°C and humidity of 50%, and a skilled worker performed opening of strand 2 at the end of winding of the 1,000 cakes to determine whether there was a delay thread, etc. We counted the number of cakes that were defective due to the occurrence of a problem in which a clue could not be found, and calculated the defective defect rate. As a result, the defective rate was 1.0%. The results are shown in Table 1.

3. Manufacture of Glass Yarn Package One hundred of the above-described cakes 1 were prepared, and glass yarn packages 11 were manufactured using the twisting machine described above as a preferred embodiment shown in FIG. Cake 1 was placed on the creel.

3-1. Evaluation of workability of yarn preparation work A skilled worker pulls out the glass strand 2 at the end of the winding of the cake 1, passes it through the guide 14, wraps it around the cylindrical glass yarn package bobbin 13 multiple times, and sets it on the spindle. Preparation work for manufacturing the glass yarn package 11 was carried out by passing the glass strand between the guide 14 and the portion wound around the bobbin 13 through a conical type traveler attached to the ring 15. This was done for 100 cakes 1, the time required to set all 100 cakes was totaled, and the time was divided by 100 to calculate the average working time required to set each cake 1. As a result, the average working time was 49 seconds. The results are shown in Table 1.

3-2. Manufacture of glass yarn package 11 For the yarn that has been subjected to the above twisting preparation work, twist the yarn by adjusting the rotational speed of the creel and the rotational speed of the spindle so that the number of twists is 0.5 (twists/25mm), A glass yarn package 11 was manufactured. In the obtained glass yarn package 11, the average count Tp of the entire length of the glass yarn 12 is 1.1 tex, the total length Lp is 175 km, the count Tp1 of the glass yarn 12 at the beginning of winding is 2.75 tex, and the average count Tp of the entire length of the glass yarn 12 is 2.75 tex. The length Lp1 of the glass yarn 12 at the part is 0.00875 km, the ratio of the length Lp1 of the glass yarn 12 at the beginning of winding to the total length Lp of the glass yarn 12 (Lp1/Lp×100) is 0.005%, and the glass The ratio (Tp1/Tp) of the count Tp1 of the winding start portion of the glass yarn 12 to the average count Tp of the entire length of the yarn 12 was 2.5.

In addition, in the above-mentioned yarn package 11, Tp was determined by sampling 20 points of 5 m each from the end of winding of the yarn 12 every 8750 m, measuring the count at each point, and taking the average value of the counts at 20 points as Tp. Specifically, 5 m of the glass yarn 12 was sampled from the end of winding (0 m point from the end of winding). Next, 8,745 m of the glass yarn 12 was unwound, and 5 m of the yarn was sampled. This was repeated 18 times to measure the count at 20 locations, and the average value of the counts at the 20 locations was defined as Tp. Further, Tp1 was obtained by sampling 5 m from the winding start of the yarn 12 (0 m point from the winding start), and the measured count was defined as Tp1.

In each of the 100 glass yarn packages 11 obtained, the glass yarn 12 at the beginning of winding is more securely set in the bobbin 13, and there is less fuzz, making it suitable for use in glass cloth for printed wiring boards. The quality was okay.

<Comparative example 1>
1. Manufacture of Cake A cake was manufactured using the spinning apparatus described above as the preferred embodiment shown in FIG. Specifically, E glass was used as the glass material, and the glass material was melted in the glass melting furnace 5 and discharged from the nozzle 6 to form the filament 4. A sizing agent 8 is applied to the filament 4 with an applicator 7, 40 filaments are converged with a gathering shoe 9 to form a glass strand 2, a collet 10 into which a cake bobbin 3 is inserted is rotated in the circumferential direction, and traversing is performed while traversing. A cake 1 was manufactured by winding the glass strand 2 around a cake bobbin 3. At this time, the temperature of the nozzle 6 is adjusted such that the average count Tc of the entire length of the glass strand 2 is 1.1 tex from the start of winding the glass strand 2 (0 m point from the start of winding) to the end of winding (200 km point from the start of winding). Cake 1 was obtained by spinning by adjusting the rotational speed of the glass head and collet 10. In the obtained cake 1, the average count Tc of the entire length of the glass strand 2 was 1.1 tex, the total length Lc was 200 km, and the count Tc1 of the end portion of the glass strand 2 was also 1.1 tex. Table 1 shows the physical properties.

In addition, in the above cake 1, Tc is determined by sampling 20 points of 5 m each at intervals of 10,000 m from the end of winding of strand 2 (200 km from the start of winding, 0 m from the end of winding), and measuring the count at each of the 20 points. The average value of the count was defined as Tc. Specifically, 5 m of glass strand 2 was sampled from the end of winding (0 m point from the end of winding). Next, the glass strand 2 was unwound for 9995 m, and then 5 m was sampled. This was repeated the remaining 18 times to measure the count at 20 locations, and the average value of the count at the 20 locations was defined as Tc. Moreover, Tc1 was sampled from 5 m from the end of winding of the strand 2 (0 m point), and the measured count was defined as Tc1.

2. Evaluation of opening 1,000 of the above cakes were prepared, each was dried for 24 hours at a temperature of 20°C and humidity of 50%, and a skilled worker performed opening of strand 2 at the end of winding of the 1,000 cakes to determine whether there was a delay thread, etc. We counted the number of cakes that were defective due to the occurrence of a problem in which a clue could not be found, and calculated the defective defect rate. As a result, the defective rate was 4.0%. The results are shown in Table 1.

3. Manufacture of Glass Yarn Package One hundred of the above-described cakes 1 were prepared, and glass yarn packages 11 were manufactured using the twisting machine described above as the preferred embodiment shown in FIG. Cake 1 was placed on the creel.

3-1. Evaluation of workability of yarn preparation work A skilled worker pulls out the glass strand 2 at the end of the winding of the cake 1, passes it through the guide 14, wraps it around the cylindrical glass yarn package bobbin 13 multiple times, and sets it on the spindle. Preparation work for manufacturing the glass yarn package 11 was carried out by passing the glass strand between the guide 14 and the portion wound around the bobbin 13 through a conical type traveler attached to the ring 15. This was done for 100 cakes 1, the time required to set all 100 cakes was totaled, and the time was divided by 100 to calculate the average working time required to set each cake 1. As a result, the average working time was 55 seconds. The results are shown in Table 1.

3-2. Manufacture of glass yarn package 11 For the yarn that has been subjected to the above twisting preparation work, twist the yarn by adjusting the rotational speed of the creel and the rotational speed of the spindle so that the number of twists is 0.5 (twists/25mm), A glass yarn package 11 was manufactured. In the obtained glass yarn package 11, the average count Tp of the entire length of the glass yarn 12 was 1.1 tex, the total length Lp was 175 km, and the count Tp1 of the winding start portion of the glass yarn 12 was also 1.1 tex.

In addition, in the above-mentioned yarn package 11, Tp was determined by sampling 20 points of 5 m each from the end of winding of the yarn 12 every 8750 m, measuring the count at each point, and taking the average value of the counts at 20 points as Tp. Specifically, 5 m of the glass yarn 12 was sampled from the end of winding (0 m point from the end of winding). Next, 8,745 m of the glass yarn 12 was unwound, and 5 m of the yarn was sampled. This was repeated 18 times to measure the count at 20 locations, and the average value of the counts at the 20 locations was defined as Tp. Further, Tp1 was obtained by sampling 5 m from the winding start of the yarn 12 (0 m point from the winding start), and the measured count was defined as Tp1.

As is clear from Table 1, Examples 1 and 2 are cakes in which glass strands are wound, and the count Tc1 at the end of winding of the glass strands in the cake is the same as that of the glass strands in the cake. Since it is larger than the average count Tc of the entire length, it can contribute to reducing the occurrence of poor lead-out and improving the workability of setting it in the twisting machine traveler.

On the other hand, Comparative Example 1 is a cake in which glass strands are wound, and the count Tc1 of the winding end portion of the glass strand in the cake is the same as the average count Tc of the entire length of the glass strand in the cake. (The filament diameter and filament count were kept constant over the entire length of the glass strand wound around the cake.) Therefore, there were many cases of poor lead-out, and it was necessary to improve the workability of setting it on the twister traveler. It was impossible to plan for it.

1 cake 2 glass strand 3 cake bobbin 4 glass filament 5 glass melting furnace 6 nozzle 7 applicator 8 sizing agent 9 gathering shoe 10 collet 11 glass yarn package 12 glass yarn 13 glass yarn package bobbin 14 guide 15 ring

Claims (4)

It is a cake wrapped with glass strands,
Tc1, which is the count measured by sampling 5 m from the end of the winding of the cake, is the average count of the total length of the glass strand in the cake, and 20 points at equal intervals with respect to the total length of the glass strand, Collect 5 m each and measure the count of each sample, and the count is greater than the average Tc of the 20 points.
The ratio of the Tc1 to the Tc (Tc1/Tc) is 1.1 to 5.0,
A cake whose Tc is 0.3 to 4.5tex . A glass yarn package wrapped with glass yarn,
5 m of the glass yarn package was sampled from the winding start, and the measured count Tp1 is the average count of the entire length of the glass yarn in the yarn package, and the count was measured at equal intervals with respect to the entire length of the glass yarn. Samples were taken at 20 locations, each 5 m long, and the count was measured at each location, and the count was greater than Tp, which was the average value of the 20 locations .
The ratio of the Tp1 to the Tp (Tp1/Tp) is 1.1 to 5.0,
A glass yarn package , wherein the Tp is 0.3 to 4.5 tex . a glass melting furnace; a plurality of nozzles that are included in the glass melting furnace and discharge molten glass from the glass melting furnace to form glass filaments; and a gathering shoe that directly draws and converges the glass filaments to form a glass strand. , using a spinning device equipped with a traverse for traversing the glass strand on a cake bobbin in the left-right direction, and a collet for winding the glass strand,
A method for producing a cake, in which the cake bobbin is set on the collet, and the glass strand is wound around the cake bobbin that rotates as the collet rotates,
When the total length of the glass strand is Lc, by decreasing the rotation speed of the collet from a point where the length Lc1 from the end of winding of the glass strand satisfies the following formula,
The average count of the entire length of the glass strand in the cake, which is the average count of the 20 points taken from 20 points at equal intervals of 5 m each over the entire length of the glass strand and measured. A method for producing a cake in which the ratio (Tc1/Tc) of Tc1, which is the count measured by sampling 5 m from the end of rolling of the cake, to Tc, which is the value, is 1.1 to 5.0.
(Formula) 0.001≦(Lc1/Lc×100)≦10 A method of manufacturing a glass yarn package wrapped with glass yarn, the method comprising:
By using the cake obtained by the method for producing a cake according to claim 3, the average count of the entire length of the glass yarn package is 20 points at equal intervals along the entire length of the glass yarn. , 5 m each was sampled and the count was measured at each point, and the ratio (Tp1/Tp) of Tp1, which is the count measured by sampling 5 m from the beginning of winding of the glass yarn, to Tp, which is the average value of the count at 20 locations. A method for producing a glass yarn to obtain a glass yarn having a particle diameter of 1.1 to 5.0.