JP2008184698A - Hollow fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new hollow fiber containing two or more hollow parts in the cross-section of the fiber, having excellent buoyancy and suitable as a fishing line. <P>SOLUTION: The hollow fiber contains a plurality of independent hollow parts in the cross-section of the fiber, wherein at least a part of the multiple hollow parts constitutes a first hollow part group consisting of a plurality of hollow parts 2 distributed at a nearly equal distance from the center and a second hollow part group consisting of a plurality of hollow parts 3 distributed at a nearly equal distance toward the center compared with the first hollow part group. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hollow fiber having two or more hollow portions in a fiber cross-sectional shape, excellent in buoyancy, and suitable for a fishing line.

  Hitherto, hollow fibers have been proposed for the purpose of weight reduction and buoyancy. Especially in the fishing line field, since various characteristics of the line are required depending on the situation and purpose of the fishing ground, it is necessary to float the fishing line on the water surface. Several have been proposed.

  As a hollow fishing line that can float on the water surface, for example, there is a fishing line made of a hollow monofilament having one continuous hollow part at the center of the fiber. However, since this fishing line has a single hollow part continuously in the center of the fiber, when the force is applied, the hollow part is crushed and the cross-sectional shape becomes flat, buoyancy is reduced, twisting occurs, and There was a problem that it was inferior in strength.

  In order to solve the problem, a fishing line is formed of a monofilament in which a hollow chamber is formed in the vicinity of the center of the fiber while partition walls are provided at predetermined intervals in the longitudinal direction, and the hollow chamber is filled with air or a gas having a specific gravity lower than air. Has been proposed (see, for example, Patent Document 1). This fishing line is more resistant to crushing and breaking than a hollow monofilament provided with a hollow portion due to the action of the partition between the hollow chambers, and has less decrease in buoyancy and strength.

  However, when the length of the hollow chamber is long, it tends to be crushed and twisted, and is inferior in strength. When the hollow portion is shortened, buoyancy is reduced. Furthermore, since gas is blown in during the production, there are problems that the roundness is inferior and the diameter varies in the longitudinal direction, and the production is complicated and the productivity is also problematic.

  Therefore, in order to solve these problems, a monofilament made of a thermoplastic polymer having two or more hollow portions via a bridging portion in the cross-sectional shape of the filament, and a hollowness ratio of 1 to 50% A hollow fishing line characterized by the above has been proposed (see, for example, Patent Document 2). This hollow fishing line is less liable to be crushed and twisted than the previous hollow fishing line due to the action of the bridging portion, and the strength is reduced relatively little.

Japanese Patent No. 2956891 JP 2001-161237 A

  However, the fishing line having two or more hollow portions via the bridge portion described above has further points to be improved. For example, during repeated use, moisture gradually permeates from the outer surface toward the center, and there is a problem that moisture enters the hollow portion and buoyancy is reduced. As for the strength, further improvement is required, and it is desirable to reduce the strength reduction caused by providing the hollow portion.

  Then, this invention makes it a subject to provide the novel hollow fiber suitable for a fishing line etc.

  As a result of repeated studies to solve the problem of buoyancy reduction due to the ingress of moisture from the outer surface when the hollow fiber is used as a fishing line, the present inventor has obtained a cross-linked portion in the fiber cross-sectional shape as shown in FIG. The conventional hollow fiber having two or more hollow portions is improved, and for example, a cross-linking portion that divides the hollow portion shown in FIG. 1 into two in the fiber diameter direction is further provided. The fiber cross-sectional shape as shown in Fig. 2 is found, and as a result, not only the above problem of buoyancy reduction is solved, but also the strength reduction is reduced. The present inventors have found that an unprecedented metallic luster can be realized because of the light refraction or reflection effect brought about by the configuration of the part, and have completed the present invention.

That is, the present invention
[1] A hollow fiber having a plurality of hollow portions independent from each other in the fiber cross section, wherein at least a part of the plurality of hollow portions is composed of a plurality of hollow portions distributed at substantially equal distances from the center. A hollow fiber, and a second hollow part group comprising a plurality of hollow parts distributed at a substantially equal distance closer to the center than the first hollow part group,
[2] The hollow fiber according to [1], further having one hollow part at the center part,
[3] The hollow fiber according to the preceding item [1] or [2], wherein the number of hollow portions constituting the first hollow portion group is equal to the number of hollow portions constituting the second hollow portion group,
[4] The hollow fiber according to any one of [1] to [3], wherein the number of hollow portions constituting the second hollow portion group is 3 to 16.
[5] The hollow fiber according to any one of [1] to [4] above, wherein the total hollowness of the whole is 3 to 40%,
[6] The hollow fiber according to any one of [1] to [5], wherein the total hollowness ratio of the second hollow portion group is 0.3 to 20%,
[7] The hollow fiber according to any one of [1] to [6], wherein the main constituent material is one resin selected from the group consisting of a polyamide resin, a polyolefin resin, a polyester resin, and a fluorine resin,
[8] The hollow fiber according to any one of [1] to [7], which is a monofilament,
[9] The hollow fiber according to any one of [1] to [8], which exhibits a metallic color tone, and [10] the hollow fiber according to any one of [1] to [9], which is a fishing line. .

  Since the hollow fiber of the present invention has a plurality of hollow parts in the fiber cross-sectional shape having the above-described specific configuration, there is a bridging part that divides the hollow part in the fiber diameter direction. Even when moisture enters the hollow part located near the outer surface when used, it is difficult for moisture to enter the hollow part located near the center via the bridge part. As a result, a decrease in buoyancy is suppressed. The hollow fiber of the present invention is less likely to cause crushing of the hollow portion or twisting of the yarn due to the action of the cross-linking portion, and the fiber strength reduction due to the provision of the hollow portion is suppressed. An excellent hollow fiber is obtained. Furthermore, the hollow fiber of the present invention can be made into a yarn exhibiting a metallic luster color regardless of the conventional method for producing gold yarn or silver yarn, and can be made into hollow fibers of various metallic colors.

  Hereinafter, the present invention will be described in detail. The hollow fiber of the present invention has hollow portions that are independent of each other in the fiber cross section. The hollow portions that are independent of each other are preferably continuous in the longitudinal direction of the fiber. The structure of the hollow portion and the like will be described below with reference to the drawings. However, the drawings are merely illustrative of the embodiments of the present invention, and the present invention is limited to the embodiments shown in the drawings. do not do. Moreover, since it is a schematic diagram, it does not accurately represent the hollow ratio or the like. In the following description, even when the term “cross section” is used instead of “fiber cross section”, it means a fiber cross section unless otherwise specified.

  FIG. 2 has a total of 12 hollow portions in cross section. Each hollow portion is arranged radially from the center of the cross section, and is divided into two groups. The first hollow portion group is composed of a plurality of (six in this figure) hollow portions disposed closer to the outer periphery than the other hollow portion groups and at substantially the same distance from the center, and this first hollow portion group. The hollow part 2 belonging to is referred to as the outer hollow part. Inside the first hollow portion group, that is, closer to the center, a plurality of (six in this figure) hollow portions that are also arranged at substantially equal distances from the center are arranged to form the second hollow portion group. ing. The hollow part 3 belonging to the first hollow part group is referred to as an inner hollow part.

  A portion that is interposed between the hollow portions and that separates the hollow portions from each other is referred to as a bridging portion. In the hollow fiber of the present invention, a bridging portion 4 (which is referred to as a radial bridging portion) oriented radially from the center and interposed between the outer hollow portions 2 or between the inner hollow portions 3 and the circumference There is a bridging portion 5 that is oriented in the direction and interposed between the outer hollow portion 2 and the inner hollow portion 3 (this bridging portion is referred to as a circumferential bridging portion). In the example of the conventional hollow fiber as shown in FIG. 1, only the radial cross-linking portion 4 exists. That each hollow part independent from each other is continuous in the longitudinal direction of the fiber means that the cross-linked part is continuous in the longitudinal direction of the fiber and becomes a partition that makes the hollow parts independent from each other.

  FIG. 3 shows a cross section of a hollow fiber having four hollow portions, that is, four outer hollow portions 2 and four inner hollow portions 3, which are another embodiment of the hollow fiber of the present invention. 2 and FIG. 3 each have an inner hollow portion 3 near the center corresponding to each outer hollow portion 2, and the number of outer hollow portions 2 is equal to the number of inner hollow portions 3. Is shown. As described above, the aspect in which the number of the hollow portions constituting the first hollow portion group and the number of the hollow portions constituting the second hollow portion group are equal improves the strength balance or the cross-sectional shape of the fiber (outer shape). (Shape) is preferable to stabilize the shape as close to the core circle as possible. However, the present invention is not limited to such an embodiment.

  FIG. 4 shows another embodiment of the hollow fiber according to the present invention, in addition to the four outer hollow portions 2 and the four inner hollow portions 3, and further, one hollow portion 6 (this hollow portion) in the central portion. A hollow fiber having a total of nine hollow portions is shown. Thus, the hollow fiber of the present invention may have an embodiment having the central hollow portion 6 in addition to the first hollow portion group and the second hollow portion group. Instead of the single hollow center portion, there may be a plurality of hollow portions near the center.

  Further, in the hollow fiber of the present invention, a plurality of hollow portions arranged at substantially the same distance from the center are arranged closer to the center of the second hollow portion group, and the third hollow portion group or more. The aspect which comprises the hollow part group of this may be sufficient.

  The number of hollow portions in the hollow fiber of the present invention is not particularly limited, but the number of cross-linked portions is increased to improve shape stability (hardness of collapsing of hollow portions, etc.) and strength, and the hollow portion Considering that production becomes difficult if the number is too large, about 6 to 33 is preferable. The number of the hollow portions constituting the second hollow portion group is preferably 3 to 16, and more preferably equal to the number of the first hollow portions. The number of the second hollow portions may be an even number or an odd number.

  The hollow fiber of the present invention can maintain strength and prevent the hollow portion from being crushed by the presence of a bridging portion between a plurality of hollow portions in the cross-sectional shape of the fiber. In addition, the plurality of hollow portions are divided into a first hollow portion group composed of a plurality of outer hollow portions and a second hollow portion group composed of a plurality of inner hollow portions, and are located closer to the center than the circumferential cross-linking portion. The inner hollow portion located has a structure in which moisture is difficult to enter, and buoyancy reduction due to moisture ingress in the case of a fishing line can be suppressed.

  Further, the shape of the hollow portion is not particularly limited, but it is preferable that the outer hollow portions are uniform in shape and cross-sectional area in order to improve the shape stability and strength of the hollow fiber. Similarly, it is preferable that the inner hollow portions have uniform shapes and cross-sectional areas.

  Moreover, when there exists a center hollow part as shown in FIG. 4, it is preferable that the cross-sectional area of a center hollow part does not become so large.

  In addition, in the conventional hollow fiber, an aspect having a central hollow portion as shown in FIG. 5 is known. However, the buoyancy due to the ingress of moisture when the hollow fiber of this aspect is used as a fishing line in the same manner as the present invention. When trying to suppress the decrease, it is necessary to increase the cross-sectional area of the central hollow portion, resulting in a decrease in shape stability and a decrease in strength, and a hollow fiber exhibiting a metallic color tone as in the present invention. I can't do that either.

  In the hollow fiber of the present invention, the total total hollow ratio, which is the ratio of the total cross-sectional area of all hollow portions to the cross-sectional area of the fiber (meaning the total area inside the outer shell of the fiber), Although it sets suitably considering the objective, Preferably it is 3 to 40%, More preferably, it is 5 to 20%. By making the total hollow ratio within this range, a hollow fiber having a specific gravity that is lightweight and floats in water in the case of a fishing line while maintaining the strength and shape stability of the fiber due to the presence of the bridging portion. It becomes possible.

In addition, the specific gravity in the case of a fishing line said above means the calculation specific gravity which considered the hollow ratio as calculated by the following formula. For example, when nylon 6 resin is used as a constituent material, the true specific gravity of nylon 6 resin is approximately 1.14, and when the hollowness is 10 to 35%, the calculated specific gravity is 0.74 to 1 from the following formula: .03.
[Equation 1]
Calculated specific gravity = [(100−hollowness) / 100] × true specific gravity of resin

  When the hollow fiber of the present invention is a fishing line, the calculated specific gravity is preferably 1.1 or less. When the calculated specific gravity exceeds 1.1, it is difficult to float on the water surface or the sea surface, and it is difficult to use it suitably for fishing fishing. In the present invention, by selecting the type of resin and the hollowness as appropriate, various fishing lines having a floating condition (calculated specific gravity) according to the conditions of the fishing ground to be used can be obtained.

  In the present invention, the total hollow ratio of the second hollow portion group, which is the ratio of the total cross-sectional area of the inner hollow portion belonging to the second hollow portion group to the fiber cross-sectional area, is 0.3 to 20 % Is preferable, and 0.5 to 10% is more preferable. By setting the total hollowness ratio of the second hollow portion group within this range, it is possible to effectively suppress a decrease in buoyancy due to moisture ingress in the case of a fishing line.

In addition, the hollow ratio in the present invention refers to the ratio of the cross-sectional area of the hollow portion in the cross-sectional shape of the single yarn, the microphotograph S optical microscope is attached to the Nikon Microphoto S optical microscope, and the cross-sectional shape of the single yarn cross-section The total area A of the cross section of the single yarn including all the hollow portions and the total area B of the hollow portions to be calculated are calculated by the following formula, and about five single yarns The average value of is adopted.
[Equation 2]
Hollow ratio (%) = [(area B) / (area A)] × 100

  That is, when calculating the total hollow ratio of the whole, the total of all areas of the hollow portions existing in the cross section is calculated as the area B, and when calculating the total hollow ratio of the second hollow portion group, the second hollow portion group The total of all areas of the hollow portions belonging to is calculated as area B.

  The hollow fiber of the present invention is preferably a synthetic fiber that can be melt-proofed. Although it does not specifically limit as resin used as the main constituent material of the hollow fiber of this invention, For example, a polyamide-type resin, a polyolefin-type resin, a polyester-type resin, a fluorine-type resin etc. can be used.

  Examples of the polyamide-based resin include aliphatic polyamides such as nylon 6, nylon 66, nylon 12, and copolymers thereof, semi-aromatic polyamides formed from aromatic diamines and dicarboxylic acids, and copolymers thereof.

  Examples of the polyester resin include terephthalic acid, isophthalic acid, naphthalene 2,6 dicarboxylic acid, phthalic acid, α, β- (4-carboxyphenoxy) ethane, 4,4′-dicarboxyphenyl, 5-sodium sulfoisophthalic acid, and the like. Aliphatic dicarboxylic acids such as aromatic dicarboxylic acid, adipic acid, sebacic acid or their esters, ethylene glycol, diethylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexane-1, Examples thereof include polyesters polycondensed from diol compounds such as 4-dimethanol, polyethylene glycol, and tetramethylene glycol, and copolymers thereof.

  Examples of the fluorine-based resin include polyvinylidene fluoride (PVDF), polytetrafluoroethylene, polymonochlorotrifluoroethylene, polyhexafluoropropylene, and copolymers thereof.

  When the hollow fiber of the present invention is a fishing line, it is preferable to use a polyamide-based resin as a main constituent material because it is inexpensive and has excellent strength and durability. It is preferred to use coalescence.

  When a polyamide-based resin is used, it is preferable that the relative viscosity of the resin (value measured at 96% sulfuric acid as a solvent, concentration 1 g / dl, temperature 25 ° C.) is 2.5 or more. If the relative viscosity is less than 2.5, the fiber strength tends to decrease. The upper limit of the relative viscosity is not particularly limited, but is preferably 4.8 or less in order to prevent the spinning and spinning properties from being lowered.

  The various resins described above may contain antiwear agents such as silicone, matting agents, modifiers, antistatic agents, pigments, and the like as long as the effects of the present invention are not significantly impaired.

  The hollow fiber of the present invention may be monofilament or multifilament, but monofilament is preferred. In the case of a fishing line, a monofilament is particularly preferable. Although it does not specifically limit as thickness of a hollow fiber, For example, in the case of a fishing line, about 100-1000 micrometers in diameter is preferable and about 120-800 micrometers in diameter is more preferable.

  The shape of the outline of the hollow fiber is preferably a perfect circle or a cross-sectional shape close to a perfect circle, but is not limited thereto. Moreover, it is not restricted to the thread | yarn whose diameter is constant in the longitudinal direction of a thread | yarn, You may be the hollow fiber which changed the diameter to the taper shape in the longitudinal direction of the thread | yarn.

  Since the hollow fiber of the present invention has not only a radial cross-linked portion but also a circumferential cross-linked portion in the cross section, the strength reduction is suppressed regardless of the presence of the hollow portion, and the linear strength and / or knot strength is excellent. For example, when a monofilament is formed using a polyamide-based resin, the linear strength is preferably about 7.0 to 9.5 cN / dtex, more preferably about 7.6 to 9.5 cN / dtex, and the nodule strength is 5.5. ˜8.0 cN / dtex, more preferably 6.0 to 8.0 cN / dtex. By setting it as such intensity | strength, it can be used more suitably as a fishing line, and it can be used without a problem also in severe conditions, such as the situation where flows, such as a mountain stream, are quick.

  In the present invention, in addition to the above-described suppression of buoyancy reduction, improvement of shape stability and strength, a hollow fiber having a unique property that is considered to be due to optical action can be obtained. That is, in the present invention, a hollow fiber exhibiting a metallic color tone can be obtained by arranging a plurality of outer hollow portions and a plurality of inner hollow portions as described above. As yarns exhibiting a metallic color tone, yarns coated with a metal film of gold or silver and yarns using metal fibers are known. However, in the present invention, a metal film or metal fibers are used, or a metallic tone is used. It is possible to obtain a yarn having a metallic color tone without using any pigments or dyes. However, the hollow fiber of the present invention is not necessarily limited to the one exhibiting a metallic color tone, and may have a non-metallic color tone by using a matting agent as necessary. In addition, the phrase “presenting a metallic color tone without using a metal film or metal fiber or using a metallic pigment or dye” means that the hollow fiber of the present invention contains a metal or a metal compound. It does not mean that it must not be.

  The mechanism for obtaining a metallic color tone with the hollow fiber of the present invention is not clear, but it is probably due to the refraction or irregular reflection of light caused by the arrangement of the hollow portion unique to the present invention. For this reason, various metallic tones can be obtained simply by using ordinary pigments or dyes that are not metallic, for example, a metallic pink hollow fiber is obtained by using a pink pigment that is usually used to color pink. Similarly, it is possible to obtain a metallic green hollow fiber using a green pigment, and similarly it is possible to obtain a metallic silver hollow fiber using a gray pigment, and similarly using a yellow pigment. Thus, a metallic gold hollow fiber can be obtained. The amount of the pigment used at this time is not particularly limited, and can be set according to a commonly used amount, and various color tones can be realized by appropriately increasing or decreasing. Even without using any pigments or dyes, it is possible to obtain hollow fibers that shine in a metallic tone. Of course, a mixture of a plurality of types of pigments or dyes can also be used.

  In this way, no example of the metallic color tone yarn obtained without using a metal film or metal fiber was found in the knowledge of the present inventor, especially in the fishing line field, there was a need for a colorful fishing line. Regardless, there is no metallic fishing line in the past even though a fluorescent fishing line is present.

  The hollow fiber of the present invention may be used not only as a single material but also as a resin-coated yarn having a resin coating on the outer periphery. In conventional resin-coated yarns, in order to improve the buoyancy characteristics, it was often necessary to use a foamable resin containing a foaming agent as a coating resin. Since the yarn has excellent buoyancy characteristics, a resin-coated yarn having excellent buoyancy characteristics can be obtained without using a foamable resin, so the degree of freedom in selecting a coating resin is great.

  The thickness of the resin coating layer in the resin coating yarn can be set as appropriate, and the thickness may be uniform in the length direction of the yarn, so that the entire thickness of the resin coating yarn changes in a tapered shape. The thickness may be gradually increased. The resin-coated yarn whose thickness changes in a tapered shape is suitable for a fishing line for fly fishing.

  The hollow fiber of the present invention is a conventional hollow fiber production method, except that the shape and arrangement of the spinneret orifice are appropriately changed according to the number, position, and hollow rate of the hollow part of the single yarn to be obtained. It can be manufactured in the same manner. The application of the manufacturing method for appropriately changing the shape and arrangement of the orifice of the spinneret is easy for those skilled in the art.

  For example, an example of a manufacturing method in the case of a monofilament will be described. A monofilament that is spun by supplying thermoplastic resin to a melt spinning apparatus equipped with a spinneret whose orifice shape and arrangement are designed so that the desired hollow cross section is obtained is passed through a liquid and cooled and solidified. After winding or without winding, the film is stretched while being heated in a liquid or gas, and subjected to relaxation heat treatment if necessary.

  To change the hollow ratio, change the shape of the orifice, change the relative viscosity of the polymer, change the distance from spinning to cooling (air gap), change the temperature of the cooling liquid, etc. Is effective.

  An example in which nylon 6 is used as the thermoplastic resin will be described in more detail. First, melt spinning is performed at a melting temperature of about 260 to 280 ° C., and in the stretching process, the first stage stretching of 3.0 to 4.0 times is performed at a temperature of 90 to 95 ° C. so as not to move the stretching point. Do. Subsequently, the second stage stretching is performed at a temperature of 190 to 240 ° C., which is higher than the first stage stretching, so that the ratio is 1.5 to 2.0 times and the total stretching ratio is 5.5 to 6.5 times. . Then, relaxation heat treatment is performed at a temperature of 190 to 245 ° C. so as to be 0.8 to 1.0 times.

  The hollow fiber of the present invention is particularly suitable for fishing lines, but the application is not limited, and it can be used for industrial material applications such as fish nets and civil engineering buildings, and can have a metallic color tone. Therefore, it can be applied to applications that make use of its decorative properties, such as strings of bows, guts of tennis or badminton rackets, other sports equipment and outdoor equipment, sports clothing and outdoor clothing, and interiors of vehicles and houses.

Next, the present invention will be specifically described with reference to examples, but the present invention is not limited to such examples. Moreover, although the hollow fiber suitable for a fishing line was manufactured in the Example, the hollow fiber of this invention is not necessarily limited to a fishing line. In addition, measurement and evaluation of various values in the examples were performed as follows.
[Yarn Properties] The fineness, linear strength and elongation, knot strength and elongation were measured according to JIS 1013.
[Hollow rate] The hollow ratio was measured and calculated by the above method.
[Calculated specific gravity] The specific gravity was calculated by the above formula. At this time, calculation was performed ignoring the pigment in the example including the pigment.

Example 1
0.15% by mass of ethylenebisstearylamide is added to 12.5 kg of nylon 6 / nylon 66 copolymer resin chip (Mitsubishi Engineering Plastics Co., Ltd., product number: 2030J) with a relative viscosity of 4.5, and a normal extruder In the mold melt spinning apparatus, melt spinning was performed at a temperature of 270 ° C. using a spinneret having 13 hollow portions (6 outer hollow portions, 6 inner hollow portions, 1 central hollow portion). . After cooling the filament extruded from the spinneret with 15 ° C. water, the undrawn yarn was subsequently drawn 3.25 times in a 95 ° C. hot water bath (first stage drawing), and then hot air at 195 ° C. The film was stretched 1.81 times in the stretching furnace (second-stage stretching), and then subjected to a relaxation heat treatment of 0.9 times in a hot air oven at 200 ° C.
The cross-sectional shape of the obtained hollow fiber (monofilament) is as shown in FIG. 6, the fineness is 678 dtex, the total total hollowness (total hollowness) is 20.0%, the inner hollow part, that is, the second The total hollow ratio (hollow ratio 2) of the hollow portion group was 6.0%.

Examples 2-4
A hollow fiber (monofilament) was obtained by performing the same operation as in Example 1 except that the production conditions were changed as shown in Table 1 to change the fineness.

Examples 5 and 6
Except for adding 12.0 g of a pink compounding pigment (pigment having the composition shown in Table 2 below) to 12.5 kg of the copolymer nylon chip and changing the spinning conditions as shown in Table 1 below. The same operation as in Example 1 was performed to obtain a hollow fiber (monofilament).

Example 7
A hollow fiber (monofilament) was obtained by performing the same operation as in Example 1 except that the spinneret was replaced and the spinning conditions were changed as shown in Table 4 below. In the spinneret used here, the number and arrangement of the holes are the same as those of the base used in Example 1, and the number of hollow portions is 13 (6 outer hollow portions, 6 inner hollow portions, 1 central hollow portion 1). 6), the opening ratio of the orifice is slightly different, and the resulting hollow fiber (monofilament) has a cross-sectional shape as shown in FIG. 6, but the hollow ratio is slightly different. .

Example 8
A hollow fiber (monofilament) was obtained by performing the same operation as in Example 7 except that 10.0 g of yellow pigment (pigment shown in Table 3 below) was added to 12.5 kg of copolymer nylon chips. It was.

Example 9
A hollow fiber (monofilament) was obtained in the same manner as in Example 7 except that 1.25 g of a gray compounding pigment (pigment having the composition shown in Table 3 below) was added to 12.5 kg of copolymer nylon chips. )
Example 10
A hollow fiber (monofilament) was obtained by performing the same operation as in Example 9 except that the amount of the blended pigment was 2.5 g.

  In addition, the yarn production conditions in Examples 1 to 6 are shown in Table 1 below, and the yarn production conditions in Examples 7 to 10 are shown in Table 4 below. Here, regarding the roller speed, the first stage stretching is performed between the roller 1 and the roller 2, the second stage stretching is performed between the roller 2 and the roller 3, and the relaxation heat treatment is performed between the roller 3 and the roller 4. It is in. Moreover, the composition of the pigment used in Examples 5, 6 and 8 to 10 is shown in Table 3 below. The physical properties of the hollow fibers obtained in Examples 1 to 6 are shown in Table 2 below, and the physical properties of the hollow fibers obtained in Examples 7 to 10 are shown in Table 5 below.

As is clear from the results shown in the table, the hollow fibers of Examples 1 to 10 have sufficient yarn physical properties, a small specific gravity, can float over the water surface and the sea surface for a long period of time, and have a roundness. And no twisting occurred, and it was suitable as a fishing line for fishing.
Further, when observed under the clear sky during the day, the hollow fibers of Examples 5 and 6 exhibit a color tone shining in metallic pink, and the hollow fiber of Example 8 exhibits a color tone shining in metallic gold. The hollow fiber had a metallic silver shine. The hollow fibers of Examples 1 to 4 and 7 in which no pigment for coloring was used also looked shining metallic.

It is a cross-sectional schematic diagram which shows an example of the conventional hollow fiber. It is a cross-sectional schematic diagram which shows one embodiment of the hollow fiber of this invention. It is a cross-sectional schematic diagram which shows the other embodiment of the hollow fiber of this invention. It is a cross-sectional schematic diagram which shows the other embodiment of the hollow fiber of this invention. It is a cross-sectional schematic diagram which shows the other example of the conventional hollow fiber. It is a cross-sectional schematic diagram which shows the other embodiment of the hollow fiber of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow part 2 Outer hollow part 3 Inner hollow part 4 Radial direction bridge part 5 Circumferential direction bridge part 6 Center hollow part

Claims (10)

  A hollow fiber having a plurality of hollow portions independent of each other in the fiber cross section, wherein at least a part of the plurality of hollow portions is composed of a plurality of hollow portions distributed at substantially equal distances from the center. A hollow fiber comprising a group and a second hollow part group comprising a plurality of hollow parts distributed at substantially equal distances closer to the center than the first hollow part group.   Furthermore, the hollow fiber of Claim 1 which has one hollow part in center part.   The hollow fiber according to claim 1 or 2, wherein the number of hollow portions constituting the first hollow portion group is equal to the number of hollow portions constituting the second hollow portion group.   The hollow fiber according to any one of claims 1 to 3, wherein the number of hollow portions constituting the second hollow portion group is 3 to 16.   The hollow fiber according to any one of claims 1 to 4, wherein the total hollowness is 3 to 40%.   The hollow fiber according to any one of claims 1 to 5, wherein the total hollowness of the second hollow portion group is 0.3 to 20%.   The hollow fiber according to any one of claims 1 to 6, wherein the main constituent material is one resin selected from the group consisting of a polyamide-based resin, a polyolefin-based resin, a polyester-based resin, and a fluorine-based resin.   It is a monofilament, The hollow fiber in any one of Claims 1-7.   The hollow fiber according to any one of claims 1 to 8, which exhibits a metallic color tone.   It is a fishing line, The hollow fiber in any one of Claims 1-9.

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