JP6669487B2 - Disc for false twisting machine - Google Patents

Description

  The present invention relates to a false twister disc used in a false twister.

  BACKGROUND ART Conventionally, in order to twist a yarn, a method of contacting a plurality of rotating false twister disks (hereinafter, the false twister disk is sometimes simply referred to as a disk) has been used. Here, as a material of the disk, a resin such as a highly durable ceramic or urethane having a high twisting effect on a thread (easy to be twisted) as described in Patent Document 1 is used. I have.

JP-A-8-170235

  However, when a disk made of ceramics is used, the durability is high but the hardness is high, so that the sliding contact at the time of twisting causes the yarn to be scraped, so that so-called snow (powder dust) is easily generated. Was. In addition, it was difficult for the ceramics to twist the thread as compared with a resin such as urethane.

  On the other hand, in the case of a disk made of a resin such as urethane, the lubricating oil contained in the thread that comes into contact easily impregnates the resin such as urethane. It was easy to happen. In the disk described in Patent Document 1, a resin material is devised in order to suppress infiltration of lubricating oil. However, in recent years, it is required that the shape change of the disk is further reduced.

  Therefore, it is an object of the disk to provide a twisting effect on the yarn, and sufficient durability and shape stability. The present application solves such a problem.

The false twister disk according to the present embodiment includes a disc-shaped ceramic body having a convex curved side surface in an outer peripheral region, and a resin layer covering at least a part of the ceramic body. , Covering the side surface of the ceramic body, and having a thickness of 0.1 mm or more and 0.5 mm or less .

  The disk for a false twisting machine of the present embodiment has a twisting effect on the yarn, and has sufficient durability and shape stability.

1A shows a perspective view, FIG. 2B shows a cross-sectional view taken along the line XX ′, and FIG. 1C shows a state in which yarn is twisted using a disk. FIG. FIG. 3A is a perspective view, and FIG. 3B is a cross-sectional view taken along line YY ′, showing another example of the false twister disk according to the present embodiment. It is a schematic diagram of the false twisting machine using the disk for false twist of this embodiment.

  The disk for a false twisting machine of this embodiment includes a disc-shaped ceramic body and a resin layer covering at least a part of the ceramic body, and the resin layer covers an outer peripheral region of the ceramic body. Here, the disk shape is a circular shape in a plan view, a flat shape in a side view, and a ratio of diameter to thickness (thickness / diameter) of 0.3 or less. The outer peripheral region is, in other words, a region where the yarn slides. The outer peripheral region is, for example, a region corresponding to 0.97r or more from the center, where r is a radius from the center to the outer periphery in plan view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, in all the drawings of the present specification, the same parts are denoted by the same reference numerals and the description thereof will be appropriately omitted unless confusion occurs.

  1A and 1B show an example of a disk for a false twister according to the present embodiment. FIG. 1A is a perspective view, FIG. 1B is a cross-sectional view taken along line XX ′, and FIG. FIG. Here, the thread body S is, for example, a fiber made of polyester.

  The disk 10 for a false twister shown in FIG. 1 (hereinafter, simply referred to as a disk) is connected to a first main surface 1 and a second main surface 2 in a planar shape, a first main surface 1 and a second main surface 2, and An example including a side surface 6 having a convex curved surface shape and a support hole 3 penetrating the first main surface 1 and the second main surface 2 is shown. FIG. 1 shows an example in which the resin layer 5 covers the support hole 3 and a portion excluding the periphery of the support hole 3.

  The base of the disk 10 is a ceramic body 4, and the ceramic body 4 is preferably made of, for example, a ceramic (sintered body) mainly containing aluminum oxide, silicon carbide, or aluminum nitride. Ceramics containing the above components as main components have high thermal conductivity, so that heat generated by sliding contact between the resin layer 5 and the yarn can be quickly radiated.

  Here, the main component in the ceramics refers to a component that accounts for 80% by mass or more of the total 100% by mass of the components constituting the ceramic body 4. In specifying the components, the components may be identified by using an X-ray diffractometer and collating with a JCPDS card.

  The content of the component is determined by measuring the content of the metal element constituting the component by an X-ray fluorescence spectrometer (XRF) or an ICP (Inductively Coupled Plasma) emission spectrometer (ICP), and using an X-ray diffractometer. What is necessary is just to convert into the identified compound.

  Here, the ceramic body 4 contains aluminum oxide as a main component from the viewpoint that it is relatively easy to process into a desired shape, has the mechanical properties required of the disk 10, and is inexpensive. It is preferably a ceramic, and in this case, the content of aluminum oxide is preferably 99% by mass or more.

  The main component of the resin layer 5 is preferably urethane. When the main component of the resin layer 5 is urethane, for example, the urethane is obtained by curing a polyol as a main component and an isocyanate as a curing agent. The polyol is, for example, at least one of a polyacrylate polyol, a polymethacrylate polyol, a polyester polyol, a polyurethane polyol, and a polysiloxane polyol. The isocyanate is, for example, at least one of 1,6-hexamethylene diisocyanate, isophorone diisocyanate, and 4,4'-methylene dicyclohexyl diisocyanate.

  When the main component of the resin layer 5 is urethane, the resin layer 5 may contain, for example, 0.1% by mass or more and 0.75% by mass or less. When the fluorine content is within this range, the yarn S can always be imparted with a stable twist, the quality of the yarn can be improved, and the life of the resin layer 5 can be extended.

  Here, the main component in the resin layer 5 refers to a component that accounts for 60% by mass or more of the total 100% by mass of the components constituting the resin layer 5.

  The content of each component constituting the resin layer 5 may be determined by using a Fourier transform infrared spectrophotometer (FT-IR) to create a calibration curve from the intensity ratio of IR characteristic absorption of each component.

  The disk 10 has a shaft (not shown) inserted and fixed in the support hole 3, and the disk 10 rotates with the rotation of the shaft. Then, in the individual disk 10 when the yarn S is twisted using the disk 10, as shown in FIG. 1C, a portion corresponding to the outer peripheral region of the ceramic body 4 is covered with the resin layer 5. The thread S is pressed against the surface of the sliding contact area 6.

  The disk 10 according to the present embodiment does not directly contact the ceramic body 4 with the yarn S, but makes the yarn S abut on the surface of the sliding contact area 6 covered with the resin layer 5, so that the snow ( The generation of powdery dust) is suppressed. The resin layer 5 has a thickness of, for example, 0.1 mm or more and 1.5 mm or less, and is thinner than the disk itself made of resin, so that the shape change of the disk 10 due to impregnation of the lubricating oil attached to the yarn S is suppressed. ing. Therefore, the disk 10 of the present embodiment has a twisting effect on the yarn S and sufficient durability and shape stability.

  Further, the shape of the sliding contact area 6 is an important factor that determines the twist state of the yarn S. Therefore, it is preferable that the outer peripheral region of the ceramic body 4 serving as the base has a convex curved shape in a cross-sectional view as shown in FIG. In this manner, if the sliding contact area 6 located in the outer peripheral area of the ceramic body 4 has a convex curved shape, it is possible to suppress a temporal change in the twist state of the yarn S.

Various parameters representing the surface properties of the resin layer 5, for example, the maximum peak height (R _p ) of the roughness curve is 0.6 μm or more and 1.7 μm or less, and the maximum valley depth (R _v ) of the roughness curve is 0. 0.05 μm or more and 2.5 μm, ten-point average roughness (R _z ) of 1.2 μm or more and 3.7 μm or less, arithmetic average roughness (R _a ) of 0.23 μm or less, root mean square roughness (R _q ) Is 0.45 μm or less, the skewness (R _sk ) is -1.9 or more and 1.3 or less, and the kurtosis (R _ku ) is. 5 or more and 10.2 or less, and the cutting level difference (R _δc ) of the roughness curve is 0.2 μm or less.

The various parameters described above can be measured using a laser microscope (manufactured by KEYENCE CORPORATION, ultra-depth color 3D shape measuring microscope (VK-9500 or its successor model)) in accordance with JIS B 0601-2001. As measurement conditions, the magnification is 1000 times (eyepiece: 20 times, objective lens: 50 times), the measurement mode is color ultra-depth, the measurement resolution (pitch) in the height direction is 0.02 μm, and the optical zoom is 1.0. times, measuring range 278μm × 210μm, the cut-off value lambda _s 2.5 [mu] m, may be set the cut-off value lambda _c to 0.08 .mu.m.

  Further, the color tone of the surface of the resin layer 5 is preferably a color tone other than white or yellow so that adhesion of dust or the like caused by sliding contact with the yarn S is easy to determine. In particular, the color tone of the surface of the resin layer 5 is green, for example, the lightness index L * in the CIE1976L * a * b * color space by diffuse reflection light processing is 40 or more and 42 or less, and the chromaticness index a * is −53. It is preferable that the chromaticity index b * is 6 or more and 7 or less.

  The value of the lightness index L * and the values of the chromaticness indices a * and b * in the CIE1976 L * a * b * color space on the surface of the resin layer 5 can be determined in accordance with JIS Z 8722-2009. For example, a spectral color difference meter (NF777 manufactured by Nippon Denshoku Industries Co., Ltd. or its successor) may be used as the measurement conditions, with the light source set to the CIE standard light source D65 and the viewing angle set to 2 °.

  2A and 2B show another example of the false twister disc according to the present embodiment. FIG. 2A is a perspective view, and FIG. 2B is a cross-sectional view taken along line YY '.

  The disk 10 shown in FIG. 1 has the ceramic body 4 formed integrally, while the disk 20 for a false twisting machine shown in FIG. 2 is formed by stacking three ceramic bodies 4a, 4b, 4c. ing. At the left and right ends of the ceramic body 4 in the cross section shown in FIG. 2B, a step may appear due to the three ceramic bodies 4a, 4b, and 4c being overlapped. By covering, no step appears on the surface of the disk 20.

  In the embodiment shown in FIG. 2, a plurality of ceramic bodies 4a, 4b, 4c are combined, and a space 4d is provided near the center of the ceramic body 4. When the disk 20 having such a configuration has the same size, the disk 20 is lighter than the disk 10 shown in FIG. 1 and can reduce the force applied to the rotation of the disk 20. The power required for the false twisting operation can be reduced.

  FIG. 3 is a schematic diagram of a false twisting machine using the false twisting disk of the present embodiment.

  The false twisting machine 30 shown in FIG. 3 includes shafts 7a, 7b, 7c installed at predetermined intervals, and the disks 10a, 10b, 10c are located at predetermined intervals on these shafts 7a, 7b, 7c. ing. The disks 10a, 10b, and 10c are arranged so that at least some of them overlap when viewed from above. The shafts 7a, 7b, 7c are rotatably supported by a plate 8 arranged on the lower side, and the shafts 7a, 7b are connected by a belt 9a, and the shafts 7b, 7c are connected by a belt 9b. I have. Further, the shaft body 7b is connected to the drive belt 11.

  The guide disk 12 to which the thread 13 comes into contact first is located at the uppermost part of the shaft body 7a. The guide disk 12 may have the same shape as the false twist disk 10. Further, a truncated cone-shaped knife edge disk 14 is located at a portion where the thread 13 comes into contact last.

  When the shaft 7b is rotated by the drive source (not shown) via the drive belt 11, the shafts 7a and 7c also rotate in the same direction as the shaft 7b by the belts 9a and 9b. In this state, when the yarn body 13 is run so as to be in sliding contact with the guide disk 12, the false twisting disk 10 and the knife edge disk 14, the yarn 13 is stretched by the regulation by each false twisting disk 10 and the rotational force. The twist is given by the frictional force with the false twisting disk 10.

  Next, an example of a method for manufacturing a false twist disk of the present embodiment will be described.

  A solvent containing a resin such as urethane is applied to at least a surface portion of an outer peripheral region of a ceramic body manufactured through steps such as molding, firing, and polishing. As the coating method, for example, a coating method such as a bar coating method, a roll coating method, or a gravure coating method can be used.

  Then, the temperature is set to, for example, 80 ° C. or more and 180 ° C. or less to remove the solvent and cure the resin such as urethane, and then the resin is dried and solidified, whereby the disk for a false twister of the present embodiment can be obtained.

  The present invention is not limited to the above-described embodiments, and various changes, improvements, combinations, and the like can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 1st main surface 2 2nd main surface 3 Support hole 4 Ceramic body 5 Resin layer 6 Sliding area 7 Shaft 8 Plate 9 Belt 10, 20 Disk for false twisting machine 11 Drive belt 12 Guide disk S, 13 Thread 14 Knife edge disk 30 false twisting machine

Claims (3)

Comprising a disc-shaped ceramic body consisting comprises a side surface which is convex curved in the outer peripheral region, and a resin layer covering at least a portion of the ceramic body, the resin layer covers the side surface of the ceramic body A disk for a false twisting machine , having a thickness of 0.1 mm or more and 0.5 mm or less . The disk for a false twisting machine according to claim 1 , wherein the ceramic body has the resin layer covering the entire side surface .   3. The disk for a false twisting machine according to claim 1, wherein the main component of the resin layer is urethane.

Images