WO2012176777A1

WO2012176777A1 - Fiber guide

Info

Publication number: WO2012176777A1
Application number: PCT/JP2012/065645
Authority: WO
Inventors: 三垣　俊二; 祐大遠矢; 和幸平田; 実中須賀
Original assignee: 京セラ株式会社
Priority date: 2011-06-20
Filing date: 2012-06-19
Publication date: 2012-12-27
Also published as: JPWO2012176777A1; CN202809036U; CN102839438B; JP5269257B2; CN102839438A

Abstract

[Problem] To provide a high-hardness fiber guide with which fibers can be inhibited from suffering damage such as scratches, fraying, or fluffing and which has high wear resistance. [Solution] This fiber guide includes a yarn contact part (11) with which a yarn comes into contact, wherein at least the yarn contact part (11) is constituted of a sintered ceramic and the surface of the yarn contact part (11) has a skewness (Rsk) as determined from a roughness curve of -2.0 to 3.0. The region of the yarn contact part (11) which comes into contact with fibers (100) can hence be rendered relatively small. Consequently, wear of the yarn contact part (11) exerts a limited influence, and the fibers (100) can be inhibited from suffering damage.

Description

Fiber guide

The present invention relates to a fiber guide.

In the fiber manufacturing process, various types of fiber guides such as an oiling nozzle, a roller guide, a rod guide, and a traverse guide are attached to a textile machine and used in order to guide a fiber traveling at high speed.

In recent years, more and more fibers are produced with irregular cross sections. In addition, in order to increase production efficiency, the fiber feed rate is extremely high, 3000 to 8000 m / min. Furthermore, in order to have a function of emitting far infrared rays and a function of reducing light transmission, fibers containing hard particles such as titania, magnesia, and calcia are also made. Therefore, there has been a demand for a high-hardness fiber guide that does not cause damage such as scratches, tears, and fluff, and has high wear resistance.

As such a fiber guide, for example, Patent Document 1 is made of a ceramic containing 90% by weight or more of Al ₂ O ₃ as a main component, the average crystal grain size of Al ₂ O ₃ is 10 to 40 μm, and is on the surface. A fiber guide is disclosed in which each Al ₂ O ₃ crystal present has a central flat portion and a peripheral roundness.

JP-A-8-67420

However, in the fiber guide described in Patent Document 1, each Al ₂ O ₃ crystal existing on the surface has a flat portion at the center and a roundness around the center, and therefore guides fibers containing irregularly shaped fibers or hard particles. When used for a long period of time, the Al ₂ O ₃ crystal is worn out and tends to decrease, causing a problem of damaging the fiber.

In view of such a problem, the present invention provides a fiber guide that can reduce the influence of abrasion and suppress damage to the fiber.

The fiber guide of the present invention is characterized in that at least the contact portion with which the yarn contacts is made of a ceramic sintered body, and the skewness (Rsk) determined from the roughness curve of the surface of the contact portion is from −2.0 to 3.0. It is what.

According to the fiber guide of the present invention, at least the contact portion where the yarn contacts is made of a ceramic sintered body, and the skewness (Rsk) obtained from the surface roughness curve of the contact portion is −2.0 or more and 3.0 or less. Therefore, since the area in contact with the yarn in the yarn contact portion can be relatively reduced, the influence of abrasion on the yarn contact portion is small, and damage to the fiber can be suppressed.

The oiling nozzle which is an example of embodiment of the fiber guide of this embodiment form is shown, (a) is a perspective view, (b) is a sectional view in an AA 'line in (a), (c ) Is a schematic view showing in cross section an oiling nozzle in a state where oil is guided by guiding fibers. Other examples of the embodiment of the fiber guide of the present embodiment are respectively shown, (a) is a perspective view of a roller guide, (b) is a perspective view of a rod guide, and (c) is a perspective view of a traverse guide.

Hereinafter, an example of an embodiment of the fiber guide of this embodiment will be described.

1A and 1B show an oiling nozzle as an example of an embodiment of a fiber guide according to the present embodiment, FIG. 1A is a perspective view, and FIG. 1B is a cross-sectional view taken along line AA ′ in FIG. (C) is a schematic view showing the oiling nozzle in a cross-section in a state in which the fiber 100 is guided and oil is adhered thereto.

The oiling nozzle 10 of the example shown in FIG. 1 has an oil supply hole that opens on the inlet side of the yarn contact portion 11 with a groove-shaped guide surface formed in the oiling nozzle 10 for guiding the fiber 100 as the yarn contact portion 11. 12 and an oil sump 13 provided in the yarn contact portion 11.

In this embodiment, the fiber guide is composed of a ceramic sintered body (hereinafter sometimes referred to simply as a sintered body), and frictional heat is generated as compared with the case where the fiber guide is made of metal or resin. Since it is difficult, damage to the fiber can be reduced. As the ceramic, for example, alumina, zirconia, titania, silicon carbide, silicon nitride, or a composite thereof is preferably used.

In addition, the material of the fiber guide can be identified using an XRD (X-ray diffraction) method or an XRF (fluorescence X-ray analysis) method.

In addition, the entrance side of the yarn connection part 11 said here is the side into which the fiber 100 enters the yarn connection part 11, and in FIG.1 (c), it is the right side of a figure. In the example shown in FIG. 1 (c), the fiber 100 enters the yarn contact portion 11 from the right inlet side and exits in the direction indicated by the white arrow.

Then, as shown in FIG. 1 (c), the fiber 100 is fed at a high speed in the direction of the white arrow while sliding on the yarn contact portion 11, and at the same time, the oil is ejected from the oil supply hole 12 to the fiber 100. Oil is attached.

At this time, the ejected oil moves together with the fiber 100 and accumulates in the oil reservoir 13, and the accumulated oil adheres to the entire surface of the fiber 100.

Such an oiling nozzle 10 is required not only to allow the oil to adhere well to the fiber 100 but also to use the fiber 100 without damaging it for a long time.

FIG. 2 shows another example of the embodiment of the fiber guide of this embodiment, (a) is a perspective view of a roller guide, (b) is a perspective view of a rod guide, and (c) is a traverse guide. FIG.

A roller guide 20 which is another example of the embodiment of the fiber guide of the present embodiment shown in FIG. 2A is used in many textile machines, and this roller guide 20 rotates in a V-groove shape. The fiber 100 is guided by using the guide surface as the yarn contact portion 11. Further, the rod guide 30 shown in FIG. 2B is used for converging and separating the fibers at various places of the textile machine, and the outer peripheral surface of the rod guide 30 has the fibers 100 as the yarn contact portions 11. It is a guide. The traverse guide 40 shown in FIG. 2 (c) reciprocates in parallel with the cylindrical axis near the outer periphery of the package that rotates around the cylindrical axis when the fiber 100 is wound around the outer periphery of the cylindrical package. The fiber 100 that has passed through the groove-shaped yarn-contacting portion 11 is used for guiding the fiber 100 to the package and winding it with a uniform thickness.

And since these fiber guides all have the yarn contact portion 11 slide with the fiber 100, the fiber cross section is particularly harsh to guide the fiber containing the irregularly shaped fiber or the hard particle-containing fiber at a high speed. Under the conditions, it is required that the fiber 100 is less damaged even if the yarn contact portion 11 is worn. Therefore, in the fiber guide of this embodiment, it is important that the skewness (Rsk) obtained from the surface roughness curve of the yarn contact portion 11 is −2.0 or more and 3.0 or less.

By adopting such a configuration of the yarn contact portion 11 of the fiber guide, the region that becomes the valley can be widened in the region that becomes the peak and the region that becomes the valley indicated by the roughness curve in the yarn contact portion 11. The area where the fiber comes into contact with the yarn contact portion can be reduced. Thereby, even if the yarn contact portion 11 is worn, damage to the fiber 100 can be suppressed.

A more preferable range of skewness (Rsk) is a range of 0.5 to 2.5. Within this range, it is possible to further increase the valley region indicated by the roughness curve, and further reduce the region where the fiber 100 is in contact with the yarn-attached portion. Also, damage to the fiber 100 can be further suppressed.

Further, in the fiber guide of this embodiment, it is preferable that the kurtosis (Rku) obtained from the roughness curve of the surface of the yarn contact portion 11 is 1.5 or more and 4.5 or less.

By setting the fiber guide yarn contact portion 11 to such a configuration, the radius of curvature of the top of the mountain indicated by the roughness curve can be made relatively small. As a result, the fiber 100 can easily slide on the surface of the yarn-attached portion 11, and the load on the fiber 100 due to friction with the yarn-attached portion 11 can be reduced, whereby damage to the fiber can be suppressed.

A more preferable range of kurtosis (Rku) is 2.8 or more and 4.5 or less. Within this range, the radius of curvature of the peak of the peak indicated by the roughness curve can be further reduced, so that a state close to point contact with the fiber 100 can be obtained. Thereby, the region where the fiber 100 is in contact with the yarn contact portion can be further reduced, and the burden on the fiber 100 due to friction with the yarn contact portion 11 can be further reduced, whereby damage to the fiber can be further suppressed.

Note that the skewness (Rsk) and kurtosis (Rku) on the surface of the yarn contact portion 11 can be measured based on JIS B 0601-2001, and can be measured using a commercially available contact or non-contact type surface roughness meter. it can.

Further, in the fiber guide of the present embodiment, it is preferable that 15 or more and 60 or less crystal particles having an equivalent circle diameter of 10 μm or more exist in the range of 10030 μm ^{2 on} the surface of the yarn contact portion 11.

When the surface of the yarn-attached portion 11 has such a structure, since many crystal particles having a large crystal grain size are present on the surface of the yarn-attached portion 11, the thermal conductivity is improved. As a result, heat generated when the fiber 100 slides on the yarn contact portion 11 is less likely to accumulate in the yarn contact portion and can be dissipated, so that damage to the fiber due to frictional heat can be reduced.

The number of crystal grains of 10μm or more can be counted using a scanning electron microscope with a magnification of 1000x, taking a photograph of the surface of the yarn contact portion 11 with a reflected electron image, and using image analysis software for the 85μm × 118μm observation image. The crystal grain size of the equivalent circle diameter of each crystal particle is obtained, the crystal particles of 10 μm or more are counted, the same operation is performed at another location, a total of 5 locations are measured, and the average value is calculated. be able to.

Further, in the fiber guide of the present embodiment, the ceramic sintered body has Al as 92.0% by mass or more and 97.0% by mass or less in terms of Al ₂ O ₃ , Ca as 0.7% by mass or more and 4.0% by mass or less in terms of CaO, and Ti as TiO 2. 2.2 wt% to 0.5 wt% in ₂ equivalent or less, it is preferable that the Zr containing 1.0 wt% to 3.0 wt% in terms of ZrO _2.

Since Al is contained in an amount of 92.0% by mass or more and 97.0% by mass or less in terms of Al ₂ O ₃ , the ceramic sintered body has high hardness and excellent wear resistance, so that the life as a fiber guide tends to be long. In addition, since Al ₂ O ₃ having a high thermal conductivity is contained in a large amount of 92.0% by mass or more and 97.0% by mass or less, heat generated when the fiber 100 slides on the yarn-attached portion 11 is difficult to accumulate in the yarn-attached portion. Since the heat can be dissipated, the fiber damage due to frictional heat can be reduced.

In addition, since Ca is contained in an amount of 0.7% by mass or more and 4.0% by mass or less in terms of CaO, CaO (calcia) is dissolved in Al ₂ O ₃ (alumina), so that the surface tension of the crystal surface is reduced at the stage of sintering. Crystals can be rounded as a result of the increase in size and the formation of calcium aluminate (CaAl ₂ O ₄ ). Note that the same effect can be obtained by using barium oxide (BaO) or strontium oxide (SrO) instead of CaO (calcia).

Further, Ti, from that it contains less 2.2 wt% to 0.5 wt% in terms of TiO _2, TiO 2 _(titania), together with acts as a sintering aid, part of which dispersed in solid solution in the crystal grains of alumina As a result, the strength of the sintered body is improved, and cracks generated in the crystal grain boundaries and the crystal particles due to the collision between the yarn contact portion 11 and the hard particles contained in the fiber 100 can be suppressed, so that the wear resistance can be improved. it can.

Further, the Zr from that contained 1.0 wt% to 3.0 wt% in terms of ZrO _2, without ZrO 2 _(zirconia) is the solid solution with the alumina present in the grain boundaries of alumina and alumina, crystalline alumina A portion of the grain growth is constrained by zirconia, and alumina crystals grow three-dimensionally. Therefore, alumina crystals are formed to protrude, and contact with the fiber 100 is reduced while maintaining high wear resistance. Therefore, damage to the fiber 100 can be suppressed. In order for the zirconia crystals to exist at the grain boundary between alumina and alumina and to bring about the above-mentioned effects, it is preferable that zirconia crystals smaller than the average crystal grain size of alumina exist in a dispersed state. It is preferable that zirconia crystals exist at the triple point of each crystal of alumina.

The average crystal grain size of alumina is preferably 3 μm or more and 15 μm or less, and the average crystal grain size of zirconia is preferably 0.4 μm or more and less than 1.5 μm.

The same effect can be obtained by using hafnia (HfO ₂ ) or ceria (CeO ₂ ) instead of zirconia.

The average crystal grain size of alumina and zirconia was mirror-finished with a scanning electron microscope at a magnification of 750 to 5000 times, and thermal etching was performed in the range of 50 to 100 ° C lower than the firing temperature. After that, take a photograph with a backscattered electron image, draw three straight lines at an arbitrary place in the photograph, and measure the number of crystals of alumina and zirconia crossed by the straight line and the total length of each of the crystals. , By dividing the total length of each crystal by the number of each crystal.

The content of alumina, calcia, titania and zirconia contained in the sintered body constituting the yarn contact portion 11 of the oiling nozzle 10 showing an example of the embodiment of the fiber guide of this embodiment is ICP (Inductively Coupled Plasma ) Quantitative analysis using emission spectroscopy, and all the values obtained can be measured in terms of oxides.

The fiber guide of the present embodiment, 0.50 wt% to 0.10 wt% of ceramic sintered body of Si in terms of SiO ₂ or less, it is preferable to contain less 0.14 wt% 0.02 wt% in terms of MgO to Mg .

Since Si is contained in an amount of 0.10 mass% or more and 0.50 mass% or less in terms of SiO ₂ (silica), a glass phase is formed at the grain boundaries of alumina and zirconia to promote sintering, and firing is performed at a low temperature in a short time. Therefore, it becomes easy to suppress abnormal grain growth of alumina crystals. Further, since Mg is contained in an amount of 0.02% by mass or more and 0.14% by mass or less in terms of MgO (magnesia), magnesia has an effect of suppressing abnormal grain growth of alumina crystal grains as a grain growth inhibitor, and has a uniform crystal structure It becomes possible to set it as the sintered compact which has. As a result, the alumina crystal of the yarn-contacting portion 11 and the fiber 100 stably come into contact with each other at a constant interval, so that the yarn-contacting portion 11 is less worn and damage to the fiber 100 is easily suppressed.

Note that the contents of silica and magnesia can be measured quantitatively using ICP (Inductively-Coupled-Plasma) emission spectroscopy and all the obtained values can be measured in terms of oxides.

Further, in the fiber guide of this embodiment, it is preferable that the root mean square roughness (Rq) of the yarn contact portion 11 is 0.5 μm or more and 1.3 μm or less.

Since the root mean square roughness (Rq) of the yarn-attached part 11 is 0.5 μm or more and 1.3 μm or less, the protrusions formed by protruding alumina crystal particles are highly dispersed and pass through the yarn-attached part 11. The fibers 100 to be made are likely to be in point contact with the projections of the alumina crystal particles, and the fibers 100 are hardly damaged. In order to further suppress wear due to contact with the fiber 100, the yarn contact portion 11 preferably has an arithmetic average roughness (Ra) of 1.0 μm or less.

The fiber guide of the present embodiment is preferably a ceramic sintered body containing chromium oxide (Cr 2 _O _3).

If the ceramic sintered body contains chromium oxide, the fiber guide can be colored pink and the fibers 100 can be easily identified. More specifically, the lightness index L * in the CIE 1976 L * a * b * color space is 30 or more and 79 or less, and the chromaticness index a by containing 0.01 to 2.0% by mass with respect to the alumina content. * And b * can be 8 or more and 40 or less and -3 or more and 5 or less, respectively, and visibility can be improved. Therefore, when the fiber 100 is damaged, the camera monitor recognizes it quickly, and the fiber guide can be replaced at an appropriate time. The color of the fiber guide may be selected according to the color of the fiber 100 in accordance with the recognizability of the camera monitor. If iron oxide is used instead of chromium oxide, a brown fiber guide can be obtained if manganese dioxide is used. it can. The content of iron oxide and manganese dioxide is preferably 0.01% by mass or more and 10.0% by mass or less with respect to the content of alumina.

The contents of chromium oxide, iron oxide and manganese dioxide can be quantitatively analyzed using ICP (Inductively-Coupled-Plasma) emission spectrometry, and all the obtained values can be measured in terms of oxides.

Further, in the above example, the fiber guide of the present embodiment has been described using the oiling nozzle 10 shown in FIG. 1. However, the present invention is not limited to this, and the roller guide 20, the rod guide 30, and the traverse guide 40 as shown in FIG. Also included are fiber guides such as ring guides, eyelets and snail guides which are not shown.

In the above example, the fiber guide is described using an example of a ceramic sintered body. However, in the present embodiment, at least the yarn contact portion 11 only needs to be formed of a ceramic sintered body. Therefore, for example, the yarn contact portion 11 may be made of a ceramic sintered body, and the other part may be made of, for example, a metal or a resin.

Next, a method for manufacturing a fiber guide made of a ceramic sintered body according to the present embodiment will be described using the oiling nozzle 10 as an example.

For example, alumina, zirconia, titania, silicon carbide, silicon nitride, or a composite thereof and a sintering aid are mixed in a predetermined ratio, and the raw material, solvent, and ball are put into a ball mill and pulverized to a predetermined particle size. To prepare a slurry.

Further, Al and _Al 2 _{O 3} 97.0 wt% 92.0 wt% or more in terms of less, Ca and 0.7 mass% or less than 4.0 wt% in terms of CaO, Ti less 2.2 wt% to 0.5 wt% in terms of TiO _2, a Zr In order to obtain a sintered body containing 1.0% by mass or more and 3.0% by mass or less in terms of ZrO ₂ , the content of alumina, calcia, titania and yttria having a purity of 99.5% by mass or more and an average particle size of 0.3 to 1 μm 2 mol% of zirconia is mixed at a predetermined ratio, and this raw material, solvent and balls are put into a ball mill and pulverized to a predetermined particle size to produce a slurry. Further, instead of adding calcia and titania, calcium titanate (CaTiO ₃ ) may be added, and calcia and titania may be added as a deficiency. When silica, magnesium hydroxide and chromium oxide are added, for example, each powder having a purity of 99.5% by mass or more and an average particle size of 0.1 to 1 μm is weighed and mixed to a predetermined amount. The raw material, solvent and balls are put in a ball mill and pulverized to a predetermined particle size to produce a slurry.

Next, after adding a binder to the obtained slurry, a spray dryer is used to produce granules by spray drying.

Next, this granule is put into a mechanical press, and pressure is applied to produce a molded body having a predetermined shape. The molded body is subjected to cutting or the like to obtain an oiling nozzle shape. In addition, you may produce a molded object by the injection molding method.

The obtained oiling nozzle shaped molded body is, for example, when alumina is the main component, the maximum temperature is 1450 to 1750 ° C. in the atmospheric air, and the holding time at this maximum temperature is 1 to 8 hours. What is necessary is just to bake. Here, when calcia is added, the higher the calcination temperature and the longer the calcination time, the greater the amount of solid solution of calcia in alumina, so the value of kurtosis (Rku) decreases. Further, by adding titania, silica and magnesium hydroxide, the maximum temperature during firing can be set low and the holding time can be shortened, so that it is easy to suppress the abnormal growth of the crystal grain size of alumina. Note that firing conditions such as maximum temperature and holding time vary depending on the shape and size of the product or the type of firing furnace, and may be adjusted as necessary.

Next, the oiling nozzle 10 of the present embodiment can be obtained by finishing the entire surface of the obtained oiling nozzle-shaped sintered body with a barrel polishing machine. Further, blasting or the like may be combined as preprocessing.

In addition, finishing with a barrel polishing machine is performed by using a known barrel apparatus, and adding an appropriate amount of abrasive grains with a ratio of water, media, and product being about 1: 0.8: 0.5. The medium to be used can have a size of 6 to 10 mm, and the shape may be selected from spherical, triangular prism, rhombus, cylindrical, and oblique cylindrical, but it is preferable to use a spherical shape. By using a spherical material, it is easy to make point contact with the product, and it becomes easy to control skewness. Moreover, the abrasive grain to be used may be a GC grain, and may be an abrasive grain in which the first abrasive grain having a coarse count and the fine second abrasive grain are mixed. For example, the first abrasive grain and the second abrasive grain may be used. By setting the mixing ratio with the grains to 8: 2, the skewness can be adjusted by the second abrasive grains while the surface is smoothed by the first abrasive grains. In particular, it is preferable to use first abrasive grains of # 150 to # 320 and second abrasive grains of # 1200 to # 6000. The cultosis can be controlled by performing the rotation speed and the processing time of 50 to 130 rpm · 10 to 50 hours, respectively, with a barrel grinder. By processing within these ranges, it is possible to control the respective skewness and kurtosis obtained from the surface roughness curve of the yarn-attached portion 11 to be -2.0 to 3.0 and 1.5 to 4.5, respectively.

In addition, when the barrel processing time is lengthened in the finishing process, kurtosis tends to decrease. Further, when the size of the medium and the count of the second abrasive grain are made fine, the skewness tends to increase. Note that the crystal grain size can be appropriately adjusted depending on the firing temperature, and the crystal grain size can be increased if the temperature is high, and the crystal grain size can be decreased if the temperature is low.

The oiling nozzle 10 obtained in this way can have a skewness (Rsk) obtained from a roughness curve of the surface of the yarn contact portion 11 of −2.0 or more and 3.0 or less. In the region that becomes the peak and the region that becomes the valley, the region that becomes the valley can be widened, and the region in which the fiber contacts the yarn contact portion can be reduced. Thereby, compared with the case where the yarn contact portion 11 is a flat surface, the area in contact with the fiber can be reduced, so that even if the surface of the yarn contact portion 11 is worn, the fiber is Opportunities for contact can be reduced, and damage to the fibers can be suppressed.

Although the fiber guide manufacturing method of this embodiment has been described by taking the manufacturing method of the oiling nozzle 10 as an example, for example, a roller guide 20 shown in FIG. 2A or a traverse guide 40 shown in FIG. In the case of producing a fiber guide, a manufacturing method similar to that for the oiling nozzle 10 may be used. For example, in the case of a fiber guide such as the rod-shaped rod guide 30 shown in FIG. Then, a binder is added to the mixed raw material to prepare a clay, and this clay is formed into a rod shape by an extrusion molding method and cut to an appropriate length, and then fired and sintered in the same manner as the oiling nozzle 10. A body is obtained, and the necessary grinding or barrel polishing may be appropriately selected and processed.

Hereinafter, an embodiment of the present invention will be described using an oiling nozzle 10 which is an example of a fiber guide.

First, 99.0% by mass of alumina with a purity of 99.5% by mass, 0.5% by mass of calcia, and 0.5% by mass of silica are weighed and mixed, and a solvent and balls are added to this raw material to add a ball mill. The slurry was pulverized until a predetermined particle size was obtained. Then, after adding a binder to this slurry, this slurry was spray-dried using the spray dryer, and the granule was produced.

Using this granule, a molded body was produced by a mechanical press and then cut to obtain an oiling nozzle-shaped molded body.

The obtained oiling nozzle-shaped compact was fired in an air atmosphere at a maximum temperature of 1670 ° C. and a holding time at the maximum temperature of 1 hour to obtain an oiling nozzle-shaped sintered body.

Next, the entire surface of the oiling nozzle-shaped sintered body was finished with a barrel grinder. As described above, the barrel processing conditions were as follows: the amount of water, product, and media charged was 1: 0.8: 0.5 using a centrifugal barrel polishing machine, and an appropriate amount of GC abrasive was added. The media has a spherical shape with the size shown in Table 1 and is made of alumina, and the abrasive is a mixture of two types of counts of GC abrasives shown in Table 1. Processing was carried out at 90 rpm with the barrel time shown in Table 1. In the barrel polishing machine, each sample was obtained by changing the kurtosis (Rku) and skewness (Rsk) to the values shown in Table 1 by combining the barrel time, the number of abrasive grains, and the average particle diameter of the media. The oiling nozzle 10 was produced.

The average surface roughness (Ra), kurtosis (Rku), and skewness (Rsk) on the surface are based on JISB 0601-2001, with a cutoff value of 0.8 mm, a measurement length of 0.8 mm, and a measurement speed of 0.8 mm / sec. . The measuring instrument used was measured using a surface roughness meter SE-3300 manufactured by Kosaka Laboratory.

The fiber 100 used in the test contained 1.2% by mass of titanium oxide having an average crystal grain size of 1.2 μm, 75 denier, 36 filaments, and polyester having a square cross section of the fiber 100. Oiling was carried out with an oil agent application amount of 2 to 4% by mass based on the mass of the fiber 100, and a water emulsion oil agent was used. The feeding speed of the fiber 100 was set to 5000 m / min.

For each sample, if it is confirmed that any damage to the fiber 100 has occurred, it is determined that the oiling nozzle 10 needs to be replaced, and the life until the oiling nozzle 10 needs to be replaced is determined. (Time) was compared.

All samples had an average surface roughness (Ra) of 0.8 μm or less.

The results obtained are shown in Table 1.

From the results shown in Table 1, a sample No. having a skewness (Rsk) of −2.0 or more and 3.0 or less determined from the surface roughness curve of the yarn-attached portion. Samples Nos. 2 to 5 have a lifetime of at least 400 hours and are out of this range. Compared with 1 and 6, it was found that the improvement was 15 hours or more. In particular, sample no. 3 and 4 were found to have a skewness (Rsk) of 0.5 to 2.5 and a lifetime of 420 hours or more.

In addition, the sample No. in which the kurtosis (Rku) obtained from the surface roughness curve of the yarn contact portion is 1.5 or more and 4.5 or less. Samples Nos. 8 to 10 have a lifetime of at least 445 hours and are out of this range. Compared to 7 and 11, it was found that the improvement was more than 10 hours.

From the above, the skewness (Rsk) obtained from the roughness curve of the surface of the yarn-attached portion is -2.0 or more and 3.0 or less, so that the yarn-attached portion 11 is compared with the flat surface as compared with the case where the yarn-attached portion 11 is a flat surface. Since the area in contact with the fiber 100 in the portion 11 can be reduced, the chance that the fiber 100 contacts the contact portion 11 even if the surface of the contact portion 11 is worn can be reduced, and the life of the fiber guide can be reduced. It can be seen that the damage to the fiber 100 can be reduced. Among them, sample No. Nos. 3 and 4 have a skewness (Rsk) of 0.5 or more and 2.5 or less, indicating that the life of the fiber guide is as long as 420 hours or more and damage to the fiber 100 can be reduced.

In addition, since the kurtosis (Rku) obtained from the surface roughness curve of the yarn-attached portion is 1.5 or more and 4.5 or less, the radius of curvature of the tip of the protrusion can be relatively reduced in the yarn-attached portion, It can be seen that since the load on the fiber due to friction can be further reduced, the damage to the fiber can be further reduced, leading to prevention of scratches, tears and fluff. Among them, sample No. In Nos. 9 and 10, the kurtosis (Rku) is not less than 2.8 and not more than 4.5, which indicates that the life of the fiber guide is as long as 450 hours or more and damage to the fiber 100 can be reduced.

Next, a test was conducted on the influence of the number of crystal particles on the life of the oiling nozzle 10 at the yarn contact portion 11 of the oiling nozzle 10 as an example of the fiber guide.

The same method as in Example 1 was performed until the molded body was produced.

Moreover, regarding the firing, each sample was fired at the firing temperature shown in Table 2 for 1 hour.

The resulting sintered body has a media particle size of 6 to 10 mm, first abrasive grain counts of # 150 to # 320, second abrasive grain counts of # 1200 to # 6000, and barrel polishing. The processing time by the machine is 10 to 50 hours. Within this range, the skewness (Rsk) obtained from the surface roughness curve of the yarn-attached part is -2.0 to 3.0, the kurtosis (Rku) is 1.5 to 4.5, and the arithmetic average roughness The thickness (Ra) was adjusted to 0.8 μm or less. Sample No. 13 shows the sample No. of Example 1. It was produced by the same method as 9.

Then, on the surface of the yarn contact portion 11, the surface of the sintered body was photographed with a reflected electron image at a magnification of 1000 using a scanning electron microscope, and an observation image having a range of 85 μm × 118 μm (observation area: 10030 μm ² ). The image particle size of each crystal particle at the equivalent circle diameter was determined using image analysis software, and the crystal particles having an equivalent circle diameter of 10 μm or more were counted. In addition, it calculated | required by performing the operation | work in a total of 5 places with the same method, and calculating the average value.

In addition, the influence of the number of crystal grains on the life of the oiling nozzle 10 was tested under the same test conditions as in Example 1.

Table 2 shows the results obtained.

From the results shown in Table 2, the surface of the yarn contact portion, the circle equivalent diameter 10μm or more crystal grains, in the range of 10030Myuemu ^2, the sample exists 15 or more 60 or less No. Samples Nos. 13 to 16 have a lifetime of at least 445 hours, and are out of this range. Compared to 12 and 17, it was found that the improvement was more than 15 hours.

Next, a test was performed on the influence of the contents of alumina, calcia, titania and zirconia on the life of the oiling nozzle 10 in the yarn contact portion 11 of the oiling nozzle 10 as an example of the fiber guide.

First, the ratio (content) when the sintered body is alumina having a purity of 99.9% by mass, calcia, titania, and zirconia having a yttria content ratio of 2 mol% is the ratio shown in Table 3. A solvent and balls were added to this raw material, and the mixture was pulverized to a predetermined particle size with a ball mill to prepare a slurry. Then, after adding a binder to this slurry, this slurry was spray-dried using the spray dryer, and the granule was produced.

Next, this granule was put into a mechanical press and molded by applying pressure so as to obtain the shape of the oiling nozzle 10 shown in FIG.

The obtained molded body was fired in an air atmosphere with a maximum temperature of 1550 ° C. and a holding time at the maximum temperature of 1 hour.

After this, for the obtained sintered body, the media particle size is 6-10 mm, the first abrasive count is # 150- # 320, the second abrasive count is # 1200- # 6000, barrel The processing time by the polishing machine is 10 to 50 hours. Within this range, the skewness (Rsk) obtained from the surface roughness curve of the yarn-attached part is −2.0 to 3.0, the kurtosis (Rku) is 1.5 to 4.5, and the arithmetic average The sample was adjusted so that the roughness (Ra) was 0.8 μm or less. 18 to 43 oiling nozzles 10 were obtained.

Sample No. The oiling nozzle 10 shown in FIG. 1 was prepared by adding 99.0% by mass of alumina powder having a purity of 99.5%, a particle size of 0.6 μm, and a specific surface area of 8 m ² / g, containing calcia in the balance, and putting it in a mechanical press. The shape was molded by applying pressure, fired at 1650 ° C., mirror-finished with a barrel, and refired at 1700 ° C. to produce.

The proportions of alumina, calcia, titania and zirconia contained in this oiling nozzle 10 are quantitatively analyzed for the sintered body using ICP (Inductively Coupled Plasma) emission spectroscopy, and all the values obtained are converted to oxides. And measured.

Then, under the same conditions as in Examples 1 and 2, a test was conducted regarding the influence of the contents of alumina, calcia, titania and zirconia on the life of the oiling nozzle.

Table 3 shows the obtained results.

From the results shown in Table 3, the ceramic sintered body shows that Al is 92.0% by mass or more and 97.0% by mass or less in terms of Al ₂ O ₃ , Ca is 0.7% by mass or more and 4.0% by mass or less in terms of CaO, and Ti is in terms of TiO ₂ . Sample No. 0.5 to 2.2% by mass, Zr containing 1.0 to 3.0% by mass in terms of ZrO ₂ . Samples Nos. 19 to 22, 25 to 28, 31 to 34, and 37 to 40 have a lifetime of at least 520 hours and are outside this range. Compared with 18, 23, 24, 29, 30, 35, 36, 41 to 44, it was found that the improvement was over 40 hours.

From the above, at least the ceramic sintered body constituting the yarn contact section, Al and _Al 2 _{O 3} 97.0 wt% 92.0 wt% or more in terms of less, Ca and 0.7 mass% or less than 4.0 wt% in terms of CaO, Ti 2.2 wt% to 0.5 wt% in terms of TiO ₂ or less, by containing more than 3.0 mass% to 1.0 mass% in terms of ZrO ₂ and Zr, while maintaining high wear resistance, with less damage to the fibers 100 It turns out that deterioration of a thread quality can be suppressed.

Next, the ratio (content) of the sintered body of alumina, calcia, titania, zirconia with a yttria content ratio of 2 mol%, and further with silica and magnesia is the ratio shown in Table 2. The subsequent steps were the same as in Example 1 and the sample No. 45 to 56 oiling nozzles 10 were produced.

Thereafter, the test was conducted on the influence of silica and magnesia on the life of the oiling nozzle 10 under the same test conditions as in Examples 1 to 3.

Further, the ratio of alumina, calcia, titania, zirconia, silica and magnesia contained in the oiling nozzle 10 was determined by analyzing the sintered body using ICP emission spectroscopic analysis as in Example 3.

Table 4 shows the obtained results.

From the results shown in Table 4, the ceramic sintered body contains sample No. 1 containing Si in the range of 0.10 to 0.50% by mass in terms of SiO ₂ and Mg in the range of 0.02 to 0.14% by mass in terms of MgO. Samples 46-49 and 52-55 are sample Nos. It was found that the wear resistance was improved compared to 45, 50, 51 and 56, and damage to the fiber 100 could be suppressed.

From the above, the ceramic sintered body constituting at least the yarn contact portion contains Si in an amount of 0.10 to 0.50% by mass in terms of SiO ₂ and Mg in an amount of 0.02 to 0.14% by mass in terms of MgO, thereby providing high wear resistance. It can be seen that the damage to the fiber 100 can be reduced and the deterioration of the yarn quality can be suppressed while maintaining.

10: Oiling nozzle 11: Yarn contact part 12: Oil supply hole 13: Oil reservoir 20: Roller guide 30: Rod guide 40: Traverse guide 100: Fiber

Claims

At least the yarn contact portion in contact with the yarn is made of a ceramic sintered body, and the skewness (Rsk) obtained from the roughness curve of the surface of the yarn contact portion is from −2.0 to 3.0. Fiber guide.
The fiber guide according to claim 1, wherein a skewness (Rsk) obtained from a surface roughness curve of the yarn-attached portion is 0.5 or more and 2.5 or less.
The fiber guide according to claim 1 or 2, wherein a kurtosis (Rku) obtained from a surface roughness curve of the yarn-attached portion is 1.5 or more and 4.5 or less.
The fiber guide according to any one of claims 1 to 3, wherein a kurtosis (Rku) obtained from a surface roughness curve of the yarn-attached portion is 2.8 or more and 4.5 or less.
5. The crystal grain having an equivalent circle diameter of 10 μm or more exists in the range of 1530 to 60 in a range of 10030 μm 2 on the surface of the yarn-attached portion. Fiber guide.
In the ceramic sintered body, Al is 92.0% by mass or more and 97.0% by mass or less in terms of Al 2 O 3 , Ca is 0.7% by mass or more and 4.0% by mass or less in terms of CaO, and Ti is converted in terms of TiO 2. 5 to 2.2% by mass, and Zr is contained in an amount of 1.0% by mass to 3.0% by mass in terms of ZrO 2. The described fiber guide.
Claims, characterized in that the ceramic sintered body of Si to SiO 2 0.50 wt% to 0.10 wt% in terms of less, Mg and containing less 0.14 wt% 0.02 wt% in terms of MgO The fiber guide according to any one of claims 1 to 6.