JP2008007881A - Oil-feeding roller and device for taking up spun yarn by using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems such that in an oil-feeding roller for continuously feeding an oil agent to a traveling yarn of a synthetic fiber and a device for taking up a spun yarn by using the same roller, since the traveling synthetic fiber yarn forms fluffs easily and the used oil agent remains at the inside, it is difficult to deal with the growth of mold or change of the oil agent. <P>SOLUTION: This oil-feeding roller 1 for feeding the oil agent to the traveling synthetic fiber yarn is characterized in that at least a traveling surface 1a on which the fiber yarn travels, consists of dense-quality ceramics having only independent pores. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an oil supply roller for continuously applying an oil agent to a running yarn of synthetic fiber and a spinning take-up device using the oil supply roller.

  Conventionally, as a method of continuously and evenly applying a certain amount of oil to a traveling synthetic fiber yarn, a part of a cylindrical oil supply roller is immersed in an oil tank containing the oil. Rotating, forming a uniform oil film on the running surface formed on the surface of the oil supply roller, and spinning the oiling roller system to apply oil to the yarn by running the yarn in contact with the running surface The device is used.

  This oiling roller system is a system in which an oil agent is applied to a multi-filament yarn of a large number of spindles (many threads) by a single oiling roller.

  However, in recent years, the running speed has been increased, and in the oiling roller system, when the oil film is not sufficiently formed, the oil agent may be applied only to one side of the yarn, and the oil agent is applied to the spinning that runs at high speed. It was difficult to do.

  In some synthetic fibers, a polymer to which various particles are added is often used in order to improve the function of the fiber. For example, adding titanium oxide particles as a matting agent to a polymer to perform melt spinning, spinning a black original yarn using a polymer to which carbon black has been added in advance, or enhancing the color developability of the obtained raw yarn For example, when adding fine particles having a specific particle diameter and hardness at a high concentration, various guides such as an oil supply guide and rollers in the spinning process are added. Not only will the process stability such as an increase in the number of yarn breaks be deteriorated due to early wear, but also the unevenness of the dye during the dyeing process tends to occur with the wear of the guide.

In order to solve these problems, the use of high-hardness ceramic guides and oiling rollers ensures high wear resistance and prevents the yarn from rubbing during the dyeing process even when the yarn runs at high speed. In order to prevent deterioration of quality such as uneven dyeing and to increase the oil supply power of the oil agent, the oil agent on the running surface of the oil supply roller is formed by forming the oil supply roller with porous ceramics. A technique for increasing the adhesion of the resin is widely used (see Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 10-266012 Japanese Patent Application Laid-Open No. 2005-281885

  However, when the oil supply roller made of ceramics as described above is made of porous ceramics in order to hold the oil agent on the running surface, the pores that open to the running surface of the yarn are in communication with the internal pores. , Easy to become a continuous vent.

  As described above, when the porous ceramics having the communication holes is used, in the spinning take-up device, the oil agent is hardly adsorbed to the communication hole of the oil supply roller and is not easily separated. In some cases, the oil agent before the change is mixed into the oil agent after the change. In such a case, there is a problem that the initial thread-like properties change due to the mixing of the oil before the change, although the yarn is selected according to the type of the oil. In addition, since the oil agent remains in the communication hole and does not easily come off, there is a problem that if the oil supply roller is not used for a long period of time, the remaining oil agent may be spoiled or mold is likely to occur. Furthermore, in recent years, the number of thin filaments with multifilaments has been increasing, and when made of porous ceramics with communication holes, fluff is likely to occur due to pores, and in particular, fine yarns with weak yarn strength such as acetate. There was a problem that the yarns were not only fuzzy but also broken.

  In particular, when the oil supply roller is rotated at a high speed, the frictional force between the oil supply roller and the thread becomes large and yarn breakage is likely to occur, and the rotation speed of the oil supply roller cannot be increased. When the rotation speed of the roller is low, an oil film cannot be sufficiently formed on the entire running surface of the oil supply roller, and thus the oil is limited to a high viscosity oil.

  In recent years, an increasing number of spinning take-up devices that simultaneously spin a yarn weight of 12 ends (weights) or more are provided in the longitudinal direction of the oil supply roller (on the rotating shaft). The parallel direction) may be longer than 300 mm. When the longitudinal direction of the oil supply roller is elongated, the oil supply roller made of porous ceramics has low mechanical material properties compared to dense ceramics, and therefore has low rigidity, strength, and hardness. Since the specific rigidity is low, the oil supply roller bends due to its own weight, and if the oil supply roller is rotated while being bent, the yarn speed may be different between both ends and the center. It was.

  In addition, the yarn is often white before being dyed. However, when the surface of the oil supply roller on which the yarn travels is formed of white ceramics, the yarn and the oil supply roller It was difficult to identify. For this reason, there has been a problem that it is impossible to instantaneously determine whether a yarn is running on the surface of the oil supply roller or whether a defect such as yarn breakage has occurred.

  The oil supply roller of the present invention is an oil supply roller for applying an oil to a traveling synthetic fiber yarn, and at least the traveling surface on which the yarn travels is made of a dense ceramic having only independent pores. It is characterized by becoming.

  The oil supply roller of the present invention is characterized in that the independent pores have a pore occupancy ratio of 4% or less on the running surface.

  Furthermore, the oil supply roller of the present invention has an average pore diameter of 4 μm or less.

  Furthermore, the oil supply roller of the present invention is characterized in that the running surface has an arithmetic average height (Ra) of 1 μm or less.

  Furthermore, the oil supply roller of the present invention is characterized in that the ceramic is alumina ceramic.

Still further, the oil supply roller is characterized in that the running surface has a lightness index L ^* of 60 or less in a CIE 1976 L ^* a ^* b ^* color space.

  And the spinning take-up device of the present invention is characterized by using any of the oil supply rollers described above.

  According to the oil supply roller of the present invention, at least the running surface on which the yarn travels is made of dense ceramics having only independent pores, so that the occurrence of yarn fluff is low even at high speeds. A roller can be obtained.

  Further, since a base having high strength and high specific rigidity can be obtained, an oil supply roller having a small deflection is obtained. As a result, it is possible to provide an oil supply roller having a low degree of coaxiality and vibration, and a plurality of yarns can be provided. Even if the belt travels, the circumferential speed of each yarn can be made uniform.

  Further, since the traveling surface has only independent pores that do not communicate with the internal pores, the oil agent does not remain inside, and mold does not occur even when it is not used for a long period of time. Furthermore, even if the type of the oil agent is changed, the oil agent before the replacement is not mixed.

  The independent pores have a pore occupancy of 4% or less, the independent pores have an average pore diameter of 4 μm or less, or the surface on which the yarn travels has an arithmetic average height thereof. When (Ra) is 1 μm or less, it is possible to obtain an oil supply roller with less generation of yarn fluff even at high rotation.

  Furthermore, since the ceramic is an alumina ceramic, it has excellent chemical resistance, is not eroded by various oils, has excellent wear resistance even when running yarn, and has high strength and specific rigidity. A high supply roller can be obtained.

Furthermore, the oil supply roller, coloration of the ceramic, CIE1976L ^* a ^* b ^* Because in the color space ^{L *} is 60 or less, if the yarn of the white runs, roller oiling and yarn Can be easily identified, and it is easy to recognize whether the yarn is broken or traveling.

  And since the spinning take-up device of the present invention uses any of the oil supply rollers described above, it is possible to provide a spinning take-up device capable of taking up a good quality yarn without generating fuzz. .

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 is a perspective view showing an embodiment of an oil supply roller according to the present invention.

  As shown in FIG. 1, the oiling roller 1 of the present invention is a cylindrical body formed by forming a ceramic body having a metal core 1b and a running surface 1a on which a yarn made of synthetic fibers runs on the outer periphery thereof. And is for applying an oil agent to the yarn of the running synthetic fiber, characterized in that at least the running surface 1a is formed from a dense ceramic having only independent pores. .

  The core body 1b is made of a metal such as an aluminum alloy or stainless steel. For example, the core body 1b may have a structure in which the inside is hollow and the both end surfaces are sandwiched between metal bosses for weight reduction. The bonding with the ceramic body to be provided may be an adhesive, a structure that is mechanically fastened by bolts and nuts, or a structure that uses both. In the case of bonding using an adhesive, an epoxy-based adhesive is preferable as high as possible, but a silicone-based adhesive may be used when oil erosion is affected.

  The cylindrical ceramic body formed on the outer periphery of the core body 1b is made of a dense ceramic having at least the traveling surface 1a having only independent holes.

Here, the dense is a ceramic having a water absorption of 0.05% or less that can be measured according to the following method, and is a method for measuring the density and open porosity of a sintered body of fine ceramics in JIS R 1634. In accordance with the dry weight W ₁ and saturated water weight W ₃ ,
Water absorption rate (%) = (W ₃ −W ₁ ) × 100 / W ₁
It is a value calculated by the following formula.

  Further, the independent pores mean pores in which the pores are not in communication with each other, and are open to the running surface without communicating with other pores and exist independently. As will be described later, the independent pores have an average pore diameter of 4 μm or less. In addition, although the pores are communicating with each other and at least one place is an open pore, in the present invention, the continuous pore is a pore having an average pore diameter exceeding 4 μm.

  By forming the running surface 1a with such a dense ceramic having only independent pores, the strength of the ceramic body is improved, and even if the rotational speed of the oil supply roller 1 is improved, it is difficult to break, and only the independent pores are formed. Because the oil agent does not remain inside the ceramic body, it can effectively prevent mold from being generated by the remaining oil agent even when it is not used for a long time, and even if the type of oil agent is replaced, the oil agent used last time Can also be prevented from mixing. In addition, since it is made of dense ceramics, it is possible to obtain the oil supply roller 1 with little friction with the running yarn even at high rotation and with less fuzz generation. In addition, since a base having high strength and high specific rigidity can be obtained, the oil supply roller 1 has a small deflection, and the running surface 1a (outer peripheral surface) has a great deflection and coaxiality with respect to the inner core 1b. The oil supply roller 1 can be obtained.

  Usually, the thickness of the oil film on the running surface 1a of the oil supply roller 1 is preferably 5 to 40 μm. However, since it is made of dense ceramics having only independent pores, the rotational speed is adjusted as described above. The thickness of the oil film can be easily adjusted. Further, since the running surface 1a is smooth, the oil agent is easily attached, and a uniform oil film can be easily formed on the running surface 1a. Therefore, it is not necessary to adjust the thickness of the oil film with the viscosity of the oil emulsion as in the prior art, and it is possible to freely adjust the oil film according to the rotational speed of the oil supply roller 1. Furthermore, it is possible to obtain the oil supply roller 1 that is not damaged by the centrifugal force even when it rotates at a high speed.

  The independent pores preferably have a pore occupancy of 4% or less on the running surface 1a, and even when the oiling roller 1 rotates at high speed and the yarn runs on the running surface 1a at high speed, Generation of fluff can be suppressed. If the pore occupancy exceeds 4%, the generation of fluff on the yarn may not be suppressed. Further, it is more preferable that the pore occupancy is in the range of 2 to 3%, and the synthetic fiber forming the yarn is suitable for the yarn types such as polyester, acetate, nylon, acrylic, rayon, and particularly in dry spinning. The cross section of the yarn such as acetate is not close to a circle, and is particularly preferable when used for a yarn type having a unique shape.

  Furthermore, the independent pores preferably have an average pore diameter of 4 μm or less, and even when the yarn travels on the traveling surface 1a at a high speed, the edge portion of the pores does not damage the yarn. Generation | occurrence | production of the fluff of a yarn can be suppressed and the dyeing | staining unevenness of the running surface 1a can also be prevented effectively. When the average pore diameter exceeds 4 μm, it is not preferable because the occurrence of fluff may not be suppressed when the yarn travels at a high speed. Further, if the average pore diameter becomes too small, the oil retaining ability is impaired in the formation of the oil film, so that it is difficult to form an oil film on the running surface 1a of the oil supply roller 1, and it is difficult to suppress the generation of yarn fluff. Become. Therefore, the average pore diameter is more preferably in the range of 2 to 4 μm.

The pore occupancy and the average pore diameter are measured, for example, under the following conditions using LUZEX-FS manufactured by Nireco. The magnification is 100 times, the measurement area at one time is 9.0 × 10 ⁻² mm ² , the number of measurements is 10 times, the total measurement area is 9.0 × 10 ⁻¹ mm ² , and the lamp voltage is 5V.

  The running surface 1a preferably has an arithmetic average height (Ra) of 1 μm or less, and even when the yarn runs on the running surface 1a at high speed, fluff can be generated on the yarn. It is. When the arithmetic average height (Ra) exceeds 1 μm, the unevenness of the running surface 1a becomes large. Therefore, the yarn may be damaged when the yarn runs at a high speed. There is a possibility that uneven dyeing such as partially different dyeing colors may occur. Further, when the arithmetic average height Ra is less than 0.6 μm, the thickness of the oil film on the traveling surface 1a becomes thin, and the yarn may travel while slipping on the traveling surface 1a. Therefore, the arithmetic average height (Ra) is particularly preferably 0.6 μm or more and 1 μm or less.

  In addition, what is necessary is just to measure arithmetic mean height (Ra) based on JISB0601-2001. However, the measurement length and the cut-off value are 2.5 mm and 0.8 mm, respectively. In the case of measuring using a stylus type surface roughness meter, a stylus having a stylus tip radius of 2 μm is used, and the scanning speed of the stylus may be 0.5 mm / second. What is necessary is just to obtain | require the average value of arithmetic average height (Ra) from the arithmetic average height (Ra) of five places obtained by this measurement.

Further, the ceramic is preferably an alumina ceramic, excellent in chemical resistance, not eroded by various oil agents, excellent in wear resistance against running of yarn, and high in strength. A highly rigid supply roller 1 can be obtained. In addition, if the alumina purity is higher than 90%, the rigidity becomes high, and in particular, the specific rigidity (Young's modulus / specific gravity) can be greater than 80 GPa · cm ³ / g. Even when the size of the roller 1 is increased, the deflection due to the weight of the oiling roller can be kept small, so that the yarn speed of the oiling roller can be the same at both ends and the central portion. In order to achieve a specific rigidity of 80 GPa · cm ³ / g or more, the Young's modulus is preferably 310 GPa or more.

The running surface 1a of the oil supply roller 1 preferably has a lightness index L ^* in the CIE 1976 L ^* a ^* b ^* color space of 60 or less. Here, the lightness index L ^* is an index indicating the lightness and darkness of the color tone ^{. When} the value of the lightness index L ^* is large, the color tone is bright, and when the value of the lightness index L ^* is small, the color tone is dark. The value of the lightness index L ^* is set to 60 or less because the hues a ^* and b ^* do not significantly affect the reflectance of the visible light from the running surface 1a, but greatly affect the reflectance. Lightness index L ^* . If L ^* is 60 or less, it becomes easy to distinguish the coloration of the yarn and the surface 1 with the naked eye. On the other hand, when the lightness index L ^* exceeds 60, it is difficult to distinguish the white yarn. Further, the lightness index is preferably L ^* 40 or less.

In the L ^* a ^* b ^* color system, L ^* indicates a lightness index, that is, the degree of perception of light and darkness, and a ^* and b ^* are perceptual chromaticity indices, that is, two colors of hue and saturation. It shows the attributes of visual perception that are attributed together.

By the way, as the ceramic, for example, it is made of an alumina ceramic made of an oxide containing at least one of Ti, Co, Mn and Fe as a metal element and having an Al ₂ O ₃ conversion purity of 90% or more. It ’s good. Thus, it is sufficient to obtain a color with L ^* of 60 or less in the color solid (L ^* , a ^* , b ^* ). Preferably, at least one of Ti, Co, Mn and Fe is contained in the alumina ceramic in a total amount of 6 to 9.5% by mass in terms of TiO ₂ , CoO, MnO ₂ and Fe ₂ O ₃ .

  Next, a specific method for manufacturing the oil supply roller of the present invention will be described.

First, alumina (Al ₂ O ₃ ) powder as a main raw material, silicon oxide (SiO ₂ ) powder and magnesium oxide (MgO) powder as a sintering aid, and iron oxide (Fe ₂ ) as a blackening agent as raw materials. O ₃ ) powder, manganese oxide (MnO ₂ ), cobalt oxide (Co ₂ O ₃ ) powder and titanium oxide (TiO ₂ ) powder are wet-mixed and pulverized with water, and the resulting slurry is spray dryer Spray dry and granulate to make granules. The obtained granule is molded into a cylindrical shape at a pressure in the range of 80 to 100 MPa by using cold isostatic pressing (CIP) or powder pressing using a mold. A shaped compact is produced.

  Next, a cylindrical alumina ceramic is obtained by firing in an oxidizing atmosphere so that the highest firing temperature is in the range of 1420 to 1520 ° C.

Meanwhile, the proportion of the powder in the raw materials, specifically, an alumina powder 90 mass% or more, the SiO ₂ 0.8 to 2 wt%, the MgO 0.3 to 0.8 wt%, _Fe 2 O ₃ may be 0.5 to 1% by mass, MnO ₂ may be 4 to 5.5% by mass, Co ₂ O ₃ may be 1 to 2% by mass, and TiO ₂ may be 0.5 to 1% by mass. Thereby, the obtained alumina becomes black alumina ceramics and can be distinguished from the white yarn.

  Black ceramics obtained with the composition of each powder in the raw material as described above have a Young's modulus of 300 to 350 GPa, a Vickers hardness (Hv1) of 12 to 14 GPa, and a three-point bending strength of 300 to 350 MPa. It will be excellent.

In addition, the porosity is 4% or less, the average pore diameter is 4 μm, the apparent density is 3.8 to 3.9 g / cm ³ , the average crystal grain size is ³ to 8 μm, and the pores on the surface are independent. Cylindrical alumina ceramics composed only of pores can be obtained. Here, will be apparent density preferably be prepared so as to be 3.8~3.9g / cm ^3, to lower the specific stiffness the greater than 3.9g / cm ^3, 3.8g / If it is smaller than cm ^{3, the} Young's modulus will be lowered, and the specific rigidity will be lowered as well. In particular, by setting the pore occupancy rate to 4% or less, it becomes possible to produce alumina ceramics that can easily form an oil film on the surface layer even with dense ceramics.

  And the roller 1 for oil supply can be manufactured by inserting and adhering the core 1b inside the said cylindrical alumina ceramics. The oil supply roller 1 may have a cylindrical shape, and in this case, the core body 1b is unnecessary.

  The oil supply roller 1 is a drive roller that rotates as the core body 1b rotates. However, in the case of a structure using a bearing that does not infiltrate the oil agent, the oil supply roller 1 is a driven roller that freely rotates as the yarn travels. It may be a roller.

  Next, the spinning take-up device of the present invention will be described.

  FIG. 2 is an explanatory view schematically showing an embodiment of the spinning take-up device according to the present invention.

  According to FIG. 2, the spinning take-up device 10 installs a refueling roller 1 directly below the base 3, cools the yarn Y spun from the base 3 via the cooling device 2, and supplies oil. The roller 1 is driven to apply an oil, the entanglement processing device 4 performs the entanglement processing, and the winding device 7 winds the yarn Y through the godet rollers 5 and 6.

  The oil supply roller 1 uses the oil supply roller 1 of the present invention described above. By using the oil supply roller 1 of the present invention, it is possible to provide a spinning take-up device capable of taking up a good quality yarn Y without generation of fuzz.

  Examples of the present invention will be described below.

  A sample comprising the oil supply roller of the present invention was produced as follows.

First, 90.5% by mass of alumina (Al ₂ O ₃ ) powder as a main material as raw materials, 1% by mass of silicon oxide (SiO ₂ ) powder and 0.5% by mass of magnesium oxide (MgO) powder as sintering aids. %, And as a blackening agent, iron oxide (Fe ₂ O ₃ ) powder 0.8 mass%, manganese oxide (MnO ₂ ) 4.7 mass%, cobalt oxide (Co ₂ O ₃ ) powder 1.7 mass% and After 0.8% by mass of titanium oxide (TiO ₂ ) powder was wet-mixed and pulverized with water, the resulting slurry was spray-dried and granulated with a spray dryer to prepare granules. The obtained granules were formed into a cylindrical shape at a pressure in the range of 80 MPa by cold isostatic pressing (CIP) to produce a plurality of cylindrical shaped bodies. The obtained cylindrical molded body was fired at 1420 to 1520 ° C. in the air to obtain a cylindrical alumina ceramic. The obtained cylindrical alumina ceramics were ground and processed into a shape having an outer diameter of 100 mm, an inner diameter of 60 mm, and a length of 100 mm to obtain an oil supply roller. After processing, a core made of an aluminum alloy was inserted into the inside of the cylinder through an adhesive made of an epoxy resin and joined to obtain a sample of the present invention.

  Further, a test piece having a diameter of 10 mm and a thickness of 5 mm was cut out from the obtained cylindrical alumina ceramic.

  Using the obtained sample of the present invention and the cut out test piece, the following measurements and evaluations were performed.

  The arithmetic average height (Ra) of the surface of the oil supply roller was measured. In addition, what is necessary is just to measure arithmetic mean height (Ra) based on JISB0601-2001. If the measurement length and cut-off value are 2.5 mm and 0.8 mm, respectively, and a stylus type surface roughness meter is used for measurement, use a stylus with a stylus tip radius of 2 μm. The scanning speed of the needle may be 0.5 mm / second. What is necessary is just to obtain | require the average value of arithmetic average height (Ra) from the arithmetic average height (Ra) of five places obtained by this measurement.

The porosity and average pore diameter of the test piece described above were measured at 9.0 × 10 ⁻² mm ² and measured 10 times at a magnification of 100 times with LUZEX-FS manufactured by Nireco. , Measured as a total area of 9.0 × 10 ⁻¹ mm ² and a lamp voltage of 5V.

  Using a spinning take-up device as shown in FIG. 2, the oil content of the acetate tow yarn was adhered. The take-up speed at that time was constant at 2500 m / min. The oil was emulsion oil. The presence or absence of fluff at that time was determined to be “with fluff” if the number of wound yarns was 10,000 m or more. In addition, when the thread breaks during winding, it is determined that there is a thread break. Furthermore, the yarn was dyed in blue and observed for uneven dyeing.

The results are shown in Table 1.

  From these results, the samples of the present invention, No. Samples Nos. 2 to 9 have no thread breakage and sample Nos. Samples Nos. 3 to 9 were free from fluff and had an average pore diameter of 4 μm or less. In Nos. 4 to 9, fuzz and dyeing unevenness did not occur.

  On the other hand, as a comparative example, the sample No. No. 1 was found to cause fluff and thread breakage.

It is a perspective view which shows one Example of the roller for oil supply which concerns on this invention. It is explanatory drawing which shows typically one Example of a spinning take-up apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Oil supply roller 1a ... Traveling surface 1b ... Core body 2 ... Cooling device 3 ... Base 4 ... Confounding processing device 5 ... Godet roller 6 ... Godet roller 7 ... Winding Take-up device 10 ... Spinning take-up device Y ... Yarn

Claims (7)

A lubrication roller for applying an oil to a traveling synthetic fiber yarn, wherein at least the traveling surface on which the yarn travels is made of a dense ceramic having only independent pores. roller. The oil supply roller according to claim 1, wherein the independent pores have a pore occupancy ratio of 4% or less on the running surface. 3. The oil supply roller according to claim 1, wherein the independent pores have an average pore diameter of 4 μm or less. 4. The oil supply roller according to claim 1, wherein the running surface has an arithmetic average height (Ra) of 1 μm or less. 5. The oil supply roller according to claim 1, wherein the ceramic is an alumina ceramic. 6. The oil supply roller according to claim 1, wherein the running surface has a lightness index L ^* in a CIE 1976 L ^* a ^* b ^* color space of 60 or less. A spinning take-up device using the oil supply roller according to any one of claims 1 to 6.

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