JP6097968B2 - Fiber structure and use thereof - Google Patents

Description

  The present invention relates to a fiber structure formed by twisting together a fiber assembly composed of a plurality of synthetic resin monofilaments, and more specifically, it has superior flexibility than monofilaments of the same diameter, and has large surface irregularities, The present invention relates to a synthetic fiber structure suitable for a wide range of uses such as a racket gut, a lead wire for wiring, a bird's proof wire, and an agricultural tension wire.

  The fiber structure made of monofilaments has superior flexibility compared to the case where monofilaments of the same diameter are used, and the surface formed on the fiber structure is uneven. It is used in a wide range of applications, such as lead wires for wiring, birdproof wires, and tension wires for agriculture.

  However, most of the conventional fiber structures are made by stringing a plurality of monofilaments having the same diameter, and since the unevenness of the surface of the fiber structure is small, there is an increasing demand for improvement thereof.

  As a method for forming the unevenness of the fiber structure, a method of forming a spiral ridge line on the outer surface by twisting a monofilament having a polygonal cross section (for example, see Patent Document 1), both ends of the same shape or different shapes. A method of twisting the longitudinal direction of a special deformed cross-section monofilament having a cross-sectional shape in which the portions are connected by a connecting portion having a thickness smaller than the minimum value of both end portions (for example, see Patent Document 2) has been proposed. However, in these methods, the unevenness of the surface of the fiber structure can be increased to some extent by devising the cross-sectional shape of the irregular-shaped monofilament, but since the monofilament is only twisted, Insufficient and further improvements are needed in this regard.

  On the other hand, as a method of improving the unevenness of the surface while maintaining the flexibility of the fiber structure, the diameter of at least one of the monofilaments constituting a stranded wire formed by twisting a plurality of monofilaments, the diameter of another monofilament (For example, refer to Patent Document 3). Although this method can be improved to some extent, the effect of improvement is small due to the combination of round cross sections, and further improvement is required.

JP 2000-217217 A JP 2005-348851 A Japanese Utility Model Publication No. 63-24911

  The present invention has been achieved as a result of studying the solution of the problems in the prior art as an object.

  Accordingly, an object of the present invention is to provide a fiber structure that is more flexible than monofilaments having the same diameter and has large surface irregularities.

  In order to achieve the above object, according to the present invention, there is provided a fiber structure obtained by twisting and heat-fixing a fiber assembly composed of a plurality of synthetic resin monofilaments, and the fiber assembly includes at least one strip. A fiber structure characterized in that the monofilament fineness of the irregular cross-section monofilament is 1.1 to 3.0 times the single-filament fineness of the round cross-section monofilament. Provided.

In the present invention synthetic fiber structure,
The irregular cross-section monofilament is twisted to form spiral irregularities on the surface,
It is preferable that the fiber structure has a twist number of 25 to 65 times / m and that the synthetic resin monofilament is made of a polyester resin.
Moreover, the fiber structure of the present invention can be preferably used for uses such as a racket gut, a lead wire for wiring, a bird's proof wire, and an agricultural tension wire.

  According to the present invention, as will be described below, it is possible to provide a fiber structure that is more flexible than a monofilament having the same diameter and has large surface irregularities.

It is a top view of the simulated piping used for the lineability evaluation in the Example.

  Below, the fiber structure of this invention is demonstrated.

  The fiber structure of the present invention is a fiber structure obtained by twisting and heat-fixing a fiber assembly composed of a plurality of synthetic resin monofilaments, and the fiber assembly includes at least one irregular cross-section monofilament and It is important that the single-filament fineness of the irregular-shaped monofilament is 1.1 to 3.0 times the single-filament fineness of the round-shaped monofilament.

  Here, when twisting the irregular cross-section monofilament, the fiber structure can be improved to some extent by adjusting the cross-sectional shape of the irregular cross-section monofilament, but it is not preferable because it will lack flexibility, When the fiber structure is composed of only monofilaments having a round cross section, flexibility can be obtained, but surface irregularities are reduced, which is not preferable. Furthermore, it is important that the fiber structure of the present invention is formed by twisting a plurality of synthetic resin monofilaments and heat-fixing them. When knitting like a braid, a uniform synthetic fiber structure due to the difference in single yarn fineness It is not preferable because the body cannot be obtained.

  The round cross section monofilament referred to in the present invention refers to a monofilament in which the cross section of the monofilament has a substantially round cross section. Here, the substantially round cross-section means that the cross-section has a round cross-sectional shape with a roundness (a value obtained by expressing a ratio of a minor axis to a major axis in 100%) of 80% or more.

  Next, the number of twists of the fiber structure of the present invention is not particularly limited, but is preferably in the range of 25 to 65 times / m, preferably 30 to 50 times / m. When the number of twists of the synthetic fiber structure is 25 times / m or less, the yarn is easily broken, and when the number of turns is 65 times / m or more, it is not preferable because the twist is strong and flexibility is easily impaired.

  Another feature of the fiber structure of the present invention is that the single yarn fineness of the modified monofilament monofilament is 1.1 to 3.0 times, preferably 1.2 to 2 times the single yarn fineness of other round cross-section monofilaments. .5 is important.

  If the monofilament fineness of the modified cross-section monofilament is less than 1.1 times the single-filament fineness of the round cross-section monofilament, the surface irregularity of the synthetic fiber structure becomes small, which is undesirable. If the single filament fineness of the round cross-section monofilament is larger than 3.0 times, the monofilament has too different rigidity, so that when twisted, the cross-section monofilament is wound around the round cross-section monofilament, resulting in a fiber structure. This is not preferable because it lacks flexibility and the surface irregularities become small.

  Here, the cross-sectional shape of the irregular-shaped monofilament is not particularly limited, and the polygonal shape such as triangle, quadrilateral, pentagon, clover shape, petal shape, star shape, gear shape, etc., track shape, rectangular shape and irregular shape cross section It can be appropriately selected within a range that does not impair the object of the present invention, such as a joined flat shape. In addition, the irregular cross-section monofilament can be used as it is by twisting it with a round cross-section monofilament, but in order to apply a more uniform twist, the surface may be formed with spiral irregularities by applying a lower twist. preferable.

  The monofilament constituting the synthetic fiber structure of the present invention is preferably made of a polyester resin. The polyester resin is preferably polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polypropylene terephthalate, polymethylene naphthalate, polybutylene naphthalate, polypropylene naphthalate or a copolymer or blend of two or more thereof. However, polyethylene terephthalate is preferably used.

  In addition, the monofilament used in the synthetic fiber structure of the present invention includes, for example, a pigment, a dye, a weathering agent, a light resistance agent, an ultraviolet absorber, an antioxidant, a heat resistance agent, a fluorescent whitening agent, a crystallization as necessary. Various additives such as inhibitors, plasticizers, end group blocking agents, etc., various modifiers such as waxes, silicone oils, fluororesins, and the like in the raw material polymerization process, as long as the object of the present invention is not impaired. It can be added after polymerization or just before spinning.

  Although it does not specifically limit as a use of the fiber structure of this invention, It can use preferably for uses, such as a gut for rackets, a lead wire for wiring, a bird-proof wire, and a tension wire for agriculture.

  When the fiber structure of the present invention is used as a racket gut, since it is a fiber structure in which a plurality of monofilaments are twisted, the impact absorption, spin rate is higher than when a conventional polyester monofilament is used as a gut. Excellent in properties.

  When the fiber structure of the present invention is used as a lead wire for through-wires, the flexibility of the fiber structure is improved and the unevenness is increased, thereby reducing the number of contacts with the piping and improving the lineability. Become.

  When the fiber structure of the present invention is used as a bird's-proof wire, the effect of preventing birds is improved by increasing the cracks caused by the irregularities on the surface of the fiber structure.

  When the fiber structure of the present invention is used as an agricultural tension wire, the vines are easily entangled with the irregularities on the surface, and it is possible to suppress the vines from falling due to their own weight due to the growth of the plant. This eliminates the need to bind the vines and saves time.

  Next, an example of the manufacturing method of the synthetic fiber structure of the present invention will be described.

  The method for producing the synthetic fiber structure of the present invention does not require any special production apparatus, and can be produced by a known method.

  For example, polyester pellets are supplied to a known melt spinning machine, unstretched yarn extruded through a die of any shape from the melt spinning machine is cooled and solidified in a cooling water bath, and then heated at a heat transfer temperature of 3 or more at the glass transition of the synthetic resin. First, a synthetic resin monofilament is obtained by stretching in a single step or a double step in a range of 0.0 to 6.5 and then performing a relaxation or constant length heat treatment in a range of 0.85 to 1.0.

  The synthetic resin monofilaments thus obtained are aligned in the combination of the scope of the present invention, and twisted by applying S twist or Z twist while heating at a temperature above the glass transition point of the synthetic resin in a tension state, The fiber structure of the present invention is obtained by rapid cooling.

  The fiber structure of the present invention thus obtained can be used in a wide range of applications such as a racket gut, a lead wire for wiring, a bird's proof wire, and an agricultural tension wire.

Hereinafter, the synthetic fiber structure of the present invention will be described in more detail based on examples. In addition, evaluation of the synthetic fiber structure in an Example was performed with the following method. In addition, Examples 1-3 and 5-8 are reference examples.

[Fineness]
According to the definition of JIS L1013: 2010. That is, after the sample taken in the shape of a bowl was left in a temperature / humidity adjustment chamber at 20 ° C. and 65% RH for 24 hours, 20 samples having a length of 90 cm were taken, the mass at that time was measured, and the following formula was calculated.

    Fineness = sample mass / sample length × 1000.

[Long diameter and short diameter of monofilament]
Using a coolant-proof micrometer (measurement range 0 to 25 mm) manufactured by Mitutoyo Corporation, measure the maximum diameter and the minimum diameter at the same point in the longitudinal direction of the filament for each of five samples while rotating the monofilament. The average value of the maximum diameter was defined as the major axis, and the average value of the minimum diameter was defined as the minor axis.

[Roundness]
From the major axis and minor axis of the monofilament, roundness was calculated by the following formula.

    Roundness = minor axis / major axis × 100.

[Evaluation when used as a racket gut]
A fiber structure created assuming a racket gut was stretched on a tennis racket with a tension of 50Lb, and a tennis ball was tried by a high-level tennis player, and a gut using a conventional polyester monofilament was used. Evaluation was made on resilience, ball control, impact resistance, and resistance to changes in properties due to the environment.

[Evaluation when used as a bird protection line]
A fiber structure created assuming a bird-proof line was stretched over a goldfish culture pond for half a year, and the flying state of the bird during that period was evaluated in comparison with the case using a conventional bird-proof line using a round cross-section monofilament. .

[Evaluation when used as lead wire for wiring]
When the lead structure is assumed, the fiber structure is prepared by passing through the lead wire from the opening A to B of the simulated pipe formed as shown in FIG. The lead wire was evaluated for the lineability.

In addition, the elbow for electric wiring (commercial item) was used for piping at each corner, and the lengths a to f were as follows: a: 1.0 m
b: 1.2m
c: 2.4 m
d: 1.2m
e: 2.6 m
f: 1.4m
g: 2.6 m
[Evaluation when used as agricultural tension wire]
The fiber structure created assuming the tension line for agriculture is used as a tension line to catch the vine of the hop in the farm of hop cultivation, and compared with a tension line in which a plurality of monofilaments of conventional round cross section are twisted together. And evaluated.
[Example 1]
Polyethylene terephthalate resin (J055: limiting viscosity 1.37) manufactured by Mitsui Chemicals, which is a polyester resin, is used as a synthetic resin. This is supplied to an extruder type spinning machine, melted and kneaded at a spinning temperature of 300 ° C., and then passed through a gear pump. An undrawn yarn made of a polyester resin was obtained by passing through the filtration layer in the spinning pack, spinning from a spinning nozzle for producing a modified cross-section yarn having a clover cross section, and immediately cooling and solidifying in a warm water bath at 75 ° C. Subsequently, the obtained unstretched yarn was subjected to primary stretching 3.0 times in a 90 ° C. hot water bath, and then subjected to secondary stretching 1.8 times in a dry heat atmosphere at 260 ° C. to give a total draw ratio of 5.4. A modified cross-section monofilament made of polyester resin having a cross section of double and fineness of 4635 dtex was prepared.

  A round cross-section monofilament made of polyester resin having a fineness of 1758 dtex was produced by the same method except that the discharge amount and the cross-sectional shape of the spinning nozzle were changed to the round cross-section yarn production method in the production method of the irregular cross-section monofilament made of polyester resin. .

  After the monomorphic monofilament and the seven round cross-section monofilaments are gathered to form a fiber assembly, and then twisted in the S direction at a twist rate of 45 times / m in a dry heat bath at 240 ° C. The fiber assembly was heat-fixed by quenching in 20 ° C. cooling water to obtain a fiber structure.

When the obtained fiber structure was used as a racket gut, the spin performance was superior to that when a conventional polyester gut was used, the feel at impact was soft, and the ball control was easy.
[Example 2]
In the manufacturing method of the modified cross-section monofilament made of polyester resin of Example 1, the modified cross-section monofilament made of polyester resin with a fineness of 8884 dtex in the same manner except that the discharge amount and the cross-sectional shape of the spinning nozzle were changed to a triangle It was created.

  Next, a polyester resin round cross-section monofilament having a fineness of 6161 dtex was prepared in the same manner except that the cross-sectional shape of the spinning nozzle was changed to a round cross section.

  A fiber structure was obtained in the same manner as in Example 1 except that the number of twists was changed to 35 times / m using one irregular cross-section monofilament and one round cross-section monofilament.

When the obtained fiber structure was used as a racket gut, as in Example 1, the spin property was superior to that when a conventional polyester gut was used, the feel at impact was soft, and ball control was easy.
[Example 3]
In the method for producing a modified cross-section monofilament made of polyester resin in Example 1, the discharge section and the cross-sectional shape of the spinning nozzle were changed to a square, and the cross-section of the polyester resin having a squareness of 3915 dtex was changed in the same manner. A monofilament was made.

  Next, in the method for producing a modified cross-section monofilament made of polyethylene terephthalate resin, a round cross-section monofilament made of polyester resin having a fineness of 1357 dtex was used in the same manner except that the discharge amount and the cross-sectional shape of the spinning nozzle were changed to a round cross-section. Created.

  A fiber structure was obtained in the same manner as in Example 1 except that the number of twists was changed to 50 turns / m using two irregular cross-section monofilaments and seven round cross-section monofilaments.

When the obtained fiber structure was evaluated as a bird-proof line, there were more light irregular reflections and fewer birds flying than conventional bird-proof lines.
[Example 4]
In the production method of the modified cross-section monofilament made of polyester resin of Example 3, a modified cross-section monofilament made of polyester resin having a square cross section with a fineness of 5856 dtex was prepared in the same manner except that the discharge amount was changed. The produced monofilament is twisted in the Z direction at a twist rate of 25 turns / m in a dry heat bath at 240 ° C. with a single wire, and then rapidly cooled in cooling water at 20 ° C. By fixing, an irregular cross-section monofilament with a lower twist was prepared.

  Next, Toray polyamide resin (M1041: relative viscosity 4.4) was used as a synthetic resin, which was supplied to an extruder type spinning machine, melted and kneaded at a spinning temperature of 290 ° C., then passed through a gear pump, An undrawn yarn made of polyamide resin that was spun from a spinning nozzle for producing a round cross-section yarn and immediately cooled and solidified in a cooling bath at 20 ° C. was obtained. Subsequently, the obtained undrawn yarn was subjected to primary drawing 3.8 times in a steam atmosphere at 100 ° C., and then subjected to secondary drawing 1.42 times in a dry heat atmosphere at 220 ° C. to give a total draw ratio of 5. A round cross-section monofilament having a fineness of 4900 and a fineness of 3900 dtex was prepared.

  A fiber structure was obtained in the same manner as in Example 1 except that one irregular cross-section monofilament and two round cross-section monofilaments were used and the number of twists was changed to 45 times / m.

When the obtained fiber structure was evaluated as a bird-proof line, as in Example 3, the diffuse reflection of light was larger than that of the conventional bird-proof line, and the number of flying birds was also small.
[Example 5]
In the manufacturing method of the irregular cross-section monofilament made of polyester resin of Example 1, the discharge cross section and the cross-sectional shape of the spinning nozzle were changed to a triangle in the same manner, but the cross-section of the polyester resin with a fineness of 96044 dtex was triangular. A monofilament was made.

  Next, in the manufacturing method of the irregular cross-section monofilament made of the ester resin, a round cross-section monofilament made of polyester resin having a fineness of 62,674 dtex was prepared in the same manner except that the discharge amount and the cross-sectional shape of the spinning nozzle were changed to a round cross-section. did.

  A fiber structure was obtained in the same manner as in Example 1 except that one irregular cross-section monofilament and two round cross-section monofilaments were used and the number of twists was changed to 48 times / m.

  When the obtained fiber structure was passed through the simulated piping of FIG. 1 as a lead wire for wiring, it was possible to smoothly pass from the opening A to B.

[Example 6]
In the method for producing a modified cross-section monofilament made of polyester resin of Example 5, a modified cross-section monofilament made of polyester resin having a fineness of 148898 dtex in a triangular shape was prepared in the same manner except that the discharge amount was changed.

  Next, in the method for producing the irregular cross-section monofilament made of polyester resin, a round cross-section monofilament made of polyester resin having a fineness of 53339 dtex is prepared in the same manner except that the discharge amount and the cross-sectional shape of the spinning nozzle are changed to a round cross-section. did.

  A fiber structure was obtained in the same manner as in Example 1 except that one irregular cross-section monofilament and one round cross-section monofilament were used and the number of twists was changed to 27 times / m.

  When the obtained fiber structure was passed through the simulated piping of FIG. 1 as a lead wire for wiring, it was possible to smoothly pass from the openings A to B as in Example 5.

[Example 7]
In the method for producing a modified cross-section monofilament made of polyester resin in Example 1, a round cross-section monofilament made of polyester resin having a fineness of 3915 dtex was prepared in the same manner except that the discharge amount and the cross-sectional shape of the spinning nozzle were changed to a round cross-section. did.

  Except for using three modified monofilament monofilaments made of polyester resin with a fineness of 8884 dtex in cross section created in Example 2 and two round cross-section monofilaments with the fineness of 3915 dtex, except that the number of twists was changed to 45 times / m. A fiber structure was obtained in the same manner as in Example 1.

  When the obtained fiber structure was used as an agricultural tension line, the vines were better entangled than conventional tension lines, and cultivation was possible without binding the vines on the way.

[Example 8]
Using the two modified monofilament monofilaments made of polyester resin with a fineness of 8884 dtex made in Example 2 and the five round cross-section monofilaments made of polyester resin with a fineness of 3915 dtex made in Example 7, the number of twists A fiber structure was obtained in the same manner as in Example 1 except that the number of times was changed to 45 times / m.

  When the obtained fiber structure was used as an agricultural tension line, the vines were better entangled than the conventional tension line as in Example 7, and cultivation was possible without binding the vines on the way.

[Comparative Example 1]
In the method for producing a modified monofilament monofilament made of polyester resin in Example 1, a modified monofilament monofilament made of polyester resin having a clover fineness of 15983 dtex was prepared in the same manner except that the discharge amount was changed.

  After the monofilament monofilament is twisted in the S direction at a twist rate of 45 turns / m in a dry heat bath at 240 ° C. with a single wire, the monofilament monofilament is rapidly cooled in cooling water at 20 ° C. Was heat-fixed to obtain a modified cross-section monofilament having a ridge line in the fiber axis direction.

When the obtained monofilament was used as a racket gut, it was only formed by twisting a clover-shaped cross-section monofilament monofilament to form a spiral ridgeline on the surface, compared with a conventional polyester gut. Thus, although the ease of applying the spin is improved to some extent, the flexible effect cannot be obtained, so that the feel at impact is not improved and the ball control is difficult.
In addition, when the fiber structure is used as a bird's-proof wire, the surface has spiral irregularities, but the effect of causing irregular reflection of light is small because the irregularities are small, and the conventional round cross-section monofilament is used. Compared to the bird line, there was no improvement in the effect of preventing bird flight.

[Comparative Example 2]
In the manufacturing method of the irregular cross section monofilament made of polyester resin of Example 1, the discharge section and the cross section shape of the spinning nozzle were changed to a triangle in the same way, but the cross section of the fineness 190612 dtex was a triangular cross section made of polyester resin A monofilament was made.

  As in the case of Comparative Example 1, the irregular cross-section monofilament was obtained by forming a ridge line in the fiber axis direction in which a single wire was twisted in the S direction at a twist number of 45 turns / m.

  When the obtained irregular cross-section monofilament was passed through a simulated pipe as a lead wire for wiring, it was only formed by forming a helical ridgeline on the surface by hanging the monofilament monofilament with a triangular cross-section, and it was flexible. The chip was notched and the ridge line irregularities were small, so that the line resistance increased, and the lead wire could not be pushed in the middle from the opening A to B, and could not be used as a lead wire for line connection. In addition, when the obtained fiber structure is used as an agricultural tension wire, the surface unevenness is small, the tangles of the vines are bad, and when the hops bear fruit, they cannot withstand their own weight and the vines are lowered. It was necessary to tie the vine to the line on the way.

[Comparative Example 3]
Using one modified cross-section monofilament made of polyester resin having a fineness of 4635 dtex made in Example 1 and 7 round cross-section monofilaments made of polyester resin having a fineness of 1758 dtex made in Example 1, the braid is made of braid Attempts were made to create a synthetic fiber structure. However, the use of a monofilament having a large fineness in one braid resulted in a distorted fiber structure and lacked practicality.

[Comparative Example 4]
In the method for producing a modified cross-section monofilament made of polyester resin in Example 1, a round cross-section monofilament made of polyester resin having a fineness of 4700 dtex was prepared in the same manner except that the discharge amount and the cross-sectional shape of the spinning nozzle were changed to a round cross-section. did.

  Example 1 except that one round cross-section monofilament and seven round cross-section monofilaments made of polyester resin having a fineness of 1758 dtex prepared in Example 1 were used and the number of twists was changed to 45 times / m. The fiber structure was obtained by the method.

  When the obtained fiber structure was used as a racket gut, it was composed only of round cross-section monofilaments with different finenesses, so a soft feel at impact was obtained compared to the conventional polyester gut. Since the unevenness of the film becomes small, the ease of applying the spin is insufficient. In addition, when the fiber structure is used as a bird-proof wire, the surface unevenness is reduced, so that there is little surface flickering, and many birds have come in like the conventional bird-proof wire.

[Comparative Example 5]
A clover-shaped polymonofilament having a fineness of 62,674 dtex was prepared in the same manner as in Example 1 except that the discharge rate was changed in the method for producing a modified cross-section monofilament made of polyester resin. Next, a polyester resin round cross-section monofilament having a fineness of 69362 dtex was prepared in the same manner as in the polymonofilament manufacturing method of Example 1, except that the discharge amount and the cross-sectional shape of the spinning nozzle were changed to a round cross-section.

  A fiber structure in the same manner as in Example 1 except that two clover-shaped polymonofilaments having a fineness of 62673 dtex and one round cross-section polymonofilament having a fineness of 69362 dtex were used and the number of twists was changed to 45 times / m. Got.

  When the obtained fiber structure is passed through a simulated pipe as a lead wire for wiring, since a fiber structure is formed by twisting a plurality of monofilaments, flexibility is obtained. Since the ratio of the fineness of the monofilament is small, the ridges are small, the resistance of wiring is increased, and the lead wire cannot be pushed in the middle from the opening A to B, and used as a lead wire for wiring. It was impossible.

[Comparative Example 6]
A fiber structure was obtained in the same manner as in Example 1 except that four square-section polymonofilaments having a fineness of 3915 dtex prepared in Example 3 were used and the number of twists was changed to 45 times / m.

  When the obtained fiber structure is used as a racket gut, it is composed of only monofilaments with the same fineness, so that a soft feel at impact was obtained compared to the conventional polyester gut, Since the unevenness on the surface becomes small, the ease of applying the spin is insufficient. In addition, when the fiber structure is used as a bird-proof wire, the surface unevenness is reduced, so that there is little surface flickering, and many birds have come in like the conventional bird-proof wire.

[Comparative Example 7]
In the method for producing a modified cross-section monofilament made of polyester resin of Example 1, a round cross-section monofilament made of polyester resin having a fineness of 96044 dtex was obtained in the same manner except that the discharge amount and the cross-sectional shape of the spinning nozzle were changed to a round cross-section. Created.
Other than changing the number of twists to 45 times / m using one round cross-section polymonofilament with fineness of 96044 dtex and one irregular cross-section monofilament made of polyester resin with a fineness of 96044 dtex made in Example 5 Obtained a fiber structure in the same manner as in Example 1.

  When the obtained fiber structure is passed through a simulated pipe as a lead wire for wiring, since the fiber structure is formed by multiplying by a plurality of monofilaments, flexibility is obtained, but the fineness ratio of the monofilament is Since the ridge line unevenness is low and the line resistance is large, the lead wire cannot be pushed in the middle from the opening A to B, and cannot be used as a lead wire for wire passing.

[Comparative Example 8]
Using one irregular cross-section monofilament made of polyester resin with a fineness of 8884 dtex made in Example 2 and five round cross-section monofilaments made of polyester resin with a fineness of 1357 dtex made in Example 3, the number of twists was A fiber structure was obtained in the same manner as in Example 1 except that the number of times was changed to 45 times / m.

  When the obtained fiber structure is used as a racket gut, the monofilament fineness of the irregular cross-section monofilament and the fineness ratio of the round cross-section monofilament become too large, and the monofilament stiffness is too different, so if the twist is applied Since the cross-section monofilament is shaped like a round cross-section monofilament, and a flexible effect cannot be obtained compared to a conventional polyester gut, there is no improvement in the shot feeling and the ball control is difficult. Since the unevenness of the surface becomes small, the ease of applying the spin is insufficient. In addition, when the fiber structure is used as a bird-proof wire, the surface unevenness is reduced, so that there is little surface flickering, and many birds have come in like the conventional bird-proof wire.

  The structures of the monofilaments prepared in Examples and Comparative Examples and the fiber structures obtained using the monofilaments are summarized in Table 1.

  As is apparent from the results of Table 1 and Examples 1 to 8, the synthetic fiber structure satisfying the conditions of the present invention is used for rackets by taking advantage of the flexibility of the fiber structure and the size of the surface irregularities. It can be used effectively in a wide range of applications such as gut, bird proof wires, lead wires for through wires, and tension wires for agriculture.

  On the other hand, the fiber structure (Comparative Examples 1 to 8) that does not satisfy the conditions of the present invention is used as a racket gut because it lacks the flexibility of the fiber structure or the surface unevenness is small. In such a case, the impact absorbability is inferior and the hitting property is deteriorated, or the spin property is inferior. In addition, when used as a bird-proof wire, the surface has little cracking and the bird-proof effect is small, and when used as a lead wire for wiring, it is caught in the middle of the simulated piping, making it impossible to connect, When used as a tension line, there was a problem that the vines were weakly attached and lowered by their own weight, and they were not practical enough.

  As described above, the fiber structure of the present invention has improved flexibility by twisting together a plurality of synthetic resin monofilaments, and the irregularities on the surface of the fiber structure are increased by inserting deformed cross-section monofilaments. It can be widely used in applications such as racket guts, lead wires for wiring, birdproof wires, and agricultural tension wires.

A: Opening at the simulated piping entrance B: Opening at the simulated piping exit

Claims (7)

A fiber structure obtained by heat by twisting fiber aggregate composed of a plurality of synthetic resin monofilament, the fiber aggregate is composed of a modified cross-section monofilaments and round cross-section monofilaments of at least 1 Article, the The irregular cross-section monofilament is twisted to form spiral irregularities on the surface, and the single-filament fineness of the irregular cross-section monofilament is 1.1 to 3.0 times the single-filament fineness of the round cross-section monofilament. A fibrous structure characterized by that. The fiber structure according to claim 1 , wherein the number of twists of the fiber structure is 25 to 65 times / m. Textile structure according to claim 1 or 2, wherein the synthetic resin monofilament is characterized and in that it consists of a polyester resin. The racket gut which consists of a fiber structure of any one of Claims 1-3 . Botori wire made of fibrous structure according to any one of claims 1-3. The lead wire for wiring which consists of a fiber structure of any one of Claims 1-3 . An agricultural tension wire comprising the fiber structure according to any one of claims 1 to 3 .

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