JP2009219359A - Fishline - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fishline comprising a core-sheath conjugate monofilament containing a polyamide-based resin as a main part, especially having the core-sheath interface improved in delamination thereof, and simultaneously satisfying low specific gravity and high water repellency. <P>SOLUTION: The fishline comprises the core-sheath conjugate monofilament obtained by using a polyamide-based resin as the core part 1 and a polyolefin-based resin having ≤1.0 specific gravity as the sheath part 2. The core-sheath conjugate monofilament has the core part with a cross-section shape of a multifoliate shape having a plurality of leaf slit parts 3 in the perpendicular direction of the fiber axis, and is regulated so that the ratio T/L of the length T of the outer periphery of the multifoliate cross section to the length L of the circumference of the circumcircle of the periphery may be within the range of 1.2-2.5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fishing line made of a core / sheath composite monofilament mainly composed of a polyamide-based resin, and particularly to a fishing line that has improved peeling at the core / sheath interface and simultaneously satisfies a low specific gravity and a high water repellency.

  Conventionally, monofilaments mainly composed of polyamide-based resin have many useful properties such as toughness and excellent flexibility, so they are widely used in fishery materials such as fishing lines and fishing nets and various industrial materials. in use.

  However, when a monofilament made of a polyamide-based resin is applied to a fishing line, there are two disadvantages: specific gravity and water repellency.

  In an application that naturally sinks light devices such as wingfishing fishing line, Harris thread attached to the tip of the float, and the thread pass through the float as the needle with the bait sinks there, Induction mechanisms that submerge food to the depths of fish naturally are becoming mainstream.

  At this time, the fishing line made of polyamide resin has a specific gravity of 1.14 and is higher than the specific gravity of seawater (1.02). Since the resistance of the sword increased and the food could not be submerged naturally, the performance as a road thread could not be fully demonstrated.

  As a technique for solving such a problem, for example, a fishing line (for example, see Patent Document 1) containing a low specific gravity additive in order to lower the specific gravity of a polyamide monofilament mainly composed of nylon 6/12 copolymer resin is known. It has been.

  However, although such a fishing line has a low specific gravity, it has not been improved in terms of water repellency, which is another drawback, and is not necessarily satisfactory.

  On the other hand, the monofilament made of polyamide resin has a drawback that the contact angle with water is about 50 degrees, and the strength is reduced by water absorption. For this reason, extremely high water repellency is required for fishing line applications that require particularly high strength.

  As a conventional technique for improving the water repellency of such a thermoplastic resin monofilament, for example, a composite monofilament in which a modified ethylenetetrafluoroethylene copolymer having a large contact angle is arranged in the outermost layer (see, for example, Patent Document 2) is known. It has been.

  However, although such a composite monofilament can improve the desired water repellency, the specific gravity of the modified ethylenetetrafluoroethylene copolymer is as high as 1.76, so that it satisfies both the low specific gravity and the high water repellency at the same time. I couldn't always be satisfied.

  On the other hand, the core-sheath composite monofilament composed of two or more kinds of different thermoplastic resins is intended to provide the monofilament with characteristics that cannot be expressed by individual polymers by complementing the characteristics of each polymer. Various studies have been made. In particular, as a conventional technique for improving the peeling at the core-sheath interface of the core-sheath composite monofilament, for example, a mixed polymer in which the thermoplastic resin A constituting the core part and the thermoplastic resin B constituting the sheath part are blended in a small amount with each other. A composite monofilament having a core portion and a sheath portion (see, for example, Patent Document 3) is already known.

However, although such composite monofilaments can improve the desired interfacial delamination, the characteristics of the desired polymer cannot be sufficiently obtained because different types of thermoplastic resins must be blended with each other. In addition, it was not satisfactory in terms of ease of manufacturing.
JP 2005-237228 A JP-A-2005-76158 JP 2002-371434 A

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

  Accordingly, an object of the present invention is to provide a fishing line having a lower specific gravity and higher water repellency than conventional polyamide fishing lines.

  In order to achieve the above object, according to the present invention, there is provided a core-sheath composite monofilament comprising a polyamide-based resin in the core and a polyolefin-based resin having a specific gravity of 1.0 or less in the sheath, wherein the core The cross-sectional shape perpendicular to the fiber axis is a multi-leaf cross section having a plurality of leaf cracks, and the ratio T / L of the outer peripheral length T of this multi-lobe cross section and the circumferential length L of the circumscribed circle of this outer periphery is 1. A fishing line is provided which comprises a core-sheath composite monofilament in the range of 2 to 2.5.

In the fishing line of the present invention,
The specific gravity of the core-sheath composite monofilament is in the range of 1.0 to 1.1,
The number of leaf cracks in the core of the core-sheath composite monofilament is 3 to 20,
The polyolefin resin is polypropylene and / or polyethylene resin,
The core-sheath composite monofilament has a core component-to-sheath component weight ratio of 95/5 to 70/30, and the core-sheath composite monofilament has a tensile strength of 6.0 cN / dtex or more and a knot strength of 3.0 cN / It is preferable that it is dtex or more, and when these conditions are applied, it is possible to expect further superior effects.

  According to the present invention, as described below, the core-sheath composite monofilament has a multi-leafed cross-section so that the adhesion area between the core and the sheath is increased, and not only the interface peeling is improved, but also the outermost layer. By disposing polyolefin having a low specific gravity and a high contact angle with water, a fishing line having a low specific gravity and a high water repellency can be obtained as compared with a conventional fishing line made only of a polyamide-based resin. Therefore, the fishing line of the present invention is extremely useful especially for the use of the road line, taking advantage of the above-described excellent characteristics.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  1A to 1C are cross-sectional views perpendicular to the fiber axis of a fishing line satisfying the conditions of the present invention, where reference numeral 1 is a core portion, 2 is a sheath portion, 3 is a leaf fissure portion, and a solid line T. Indicates the outer peripheral length of the cross-sectional shape of the core portion 1, and the broken line L indicates the peripheral length of a circle circumscribing the cross-sectional shape of the core portion 1.

  2 (d) to 2 (f) are cross-sectional views of a fishing line that does not satisfy the conditions of the present invention as seen in FIGS. 1 (a) to 1 (c). Reference numeral 2 denotes a sheath part, 3 denotes a leaf crack part, solid line T denotes the outer peripheral length of the cross-sectional shape of the core part 1, and wavy line L denotes the peripheral length of a circle circumscribing the cross-sectional shape of the core part 1.

  The monofilament constituting the fishing line of the present invention has a basic structure of a core-sheath composite monofilament using a polyamide-based resin for the core portion 1 and a polyolefin-based resin having a specific gravity of 1.0 or less for the sheath portion 2. By using a polyamide-based resin for the core portion 1 and a polyolefin-based resin for the sheath portion 2, it is possible to impart high water repellency to the fishing line while maintaining the toughness characteristic of a fishing line made of a polyamide-based resin. Further, the specific gravity of the polyolefin resin being 1.0 or less is necessary for obtaining a composite monofilament having an apparent specific gravity lower than that of a monofilament mainly composed of a polyamide resin.

  The polyamide resin constituting the core portion 1 is, for example, at least one selected from nylon 6, nylon 66, nylon 6/66, nylon 6/12, nylon 11, and nylon 12, but is not necessarily limited thereto. It is not something.

  The polyolefin resin constituting the sheath portion 2 is preferably polypropylene and / or polyethylene resin. These resins have a contact angle with water of about 90 degrees, and are excellent in water repellency compared to a contact angle of about 50 degrees with polyamide resins.

  In order to improve the interfacial delamination between the core portion 1 and the sheath portion 2 of the composite monofilament constituting the fishing line of the present invention, as shown in (a) to (c) of FIG. A multi-leaf whose cross-sectional shape in the vertical direction is a multi-leaf cross section having a plurality of leaf cracks 3 and the ratio T / L of the outer circumferential length T to the circumferential length L of the circumscribed circle is 1.2 to 2.5 It is necessary that the cross section is a cross section, and it is more preferable that the cross section is a multileaf cross section in which the T / L ratio is in the range of 1.3 to 2.3.

  Here, when the T / L ratio is lower than the above range (for example, (d) and (e) in FIG. 2), the adhesion between the core portion 1 and the sheath portion 2 is weak and tends to be easily peeled off. . On the contrary, when the T / L ratio exceeds the above range (for example, (f) in FIG. 2), the fineness of the core 1 is reduced although it is strong against peeling between the core 1 and the sheath 2. This tends to cause a decrease in strength.

  Moreover, it is preferable that the number of the leaf crack parts 3 is 3-20. When the number of leaf cracks 3 is out of the above range, the shape satisfying the T / L ratio is very limited. Therefore, the design of the die and the shape adjustment during spinning become very difficult. Therefore, it is not preferable.

  Therefore, by making the cross-sectional shape as described above, the contact area between the core portion 1 and the sheath portion 2 is increased, and thus a tough monofilament that is difficult to peel off can be obtained.

  Next, in the fishing line of the present invention, the apparent specific gravity of the composite monofilament is preferably 1.0 to 1.1.

  Here, when the apparent specific gravity of the composite monofilament is less than 1.0, it is not preferable because it is floated on the water surface when it is used as a road thread, and is easily affected by surface tide or wind. Further, if the apparent specific gravity exceeds 1.1, it tends to sink too much when used as a road yarn, and the resistance of the road yarn increases, which is not preferable.

  Furthermore, in the core-sheath composite monofilament constituting the fishing line of the present invention, the weight ratio of the core component to the sheath component is preferably in the range of 95/5 to 70/30.

  Here, when the weight ratio of the core component and the sheath component is out of the above range, not only the toughness of the polyamide resin is lost, but also the operability tends to be difficult.

  The fishing line of the present invention preferably has a tensile strength of 6.0 cN / dtex or more and a knot strength of 3.0 cN / dtex or more.

  If the tensile strength or knot strength falls below the above range, the thread will break when the fish is hung, and not only will the fish that have been hung out escape, but it may also flow up to an expensive float. Because there is no.

  The composite monofilament constituting the fishing line of the present invention can be efficiently produced by the method described below.

  First, in melt spinning the composite monofilament, normal conditions using a composite spinning machine can be adopted, the polymer temperature is 200 to 350 ° C., the extrusion pressure is 1 to 50 MPa, the nozzle diameter is 0.1 to 20 mm, Conditions such as a spinning speed of 0.3 to 100 m / min can be appropriately selected.

  Next, the monofilament spun from each extruder and combined with the core sheath in the die passes through a short gas zone and is then cooled in a cooling bath. As a cooling medium here, A liquid inert to the polymer, usually water or warm water, is used.

  The cooled and solidified composite monofilament continues to be sent to the first drawing step. As an atmosphere (bath) for drawing and heat setting, a heated heat medium bath such as warm water, polyethylene glycol, glycerin and silicone oil, hot air is used. A body bath and a steam bath are used.

  In the stretching step, one-stage or multi-stage stretching is performed, but a preferable total stretching ratio is usually 5.0 times or more, preferably 5.5 times or more, although it varies depending on the thermoplastic resin constituting the monofilament.

  After the one-step or multi-step stretching, an appropriate constant length and / or relaxation heat treatment can be performed for the purpose of removing stretching strain as necessary.

  It should be noted that the fishing line of the present invention can be provided with additives such as pigments, dyes, light-resistant agents, ultraviolet absorbers, antioxidants, fluorescent brighteners, crystallization inhibitors, and the like as required. To the extent that it does not inhibit, it can be added to the core component and / or the sheath component during the polymerization process, after polymerization or just before spinning.

  Further, the outer shape of the fishing line of the present invention is not necessarily limited to a circular cross section, and can take any shape such as a triangular cross section, a square cross section, and a multi-leaf cross section, and a plurality of monofilaments. It does not exclude the secondary processing such as twisting or twisting a single yarn. In terms of structure, not only a two-layer structure but also a multilayer core-sheath structure of three or more layers is not excluded.

  As described above, the fishing line made of a composite monofilament in which the core component of the present invention is a polyamide resin and the sheath component is a polyolefin resin has a multi-leaf cross section at the core portion, thereby increasing the bonding area of the core sheath and the interface. Peeling has been improved, and by placing polyolefin with a low specific gravity and a high contact angle with water in the outermost layer, a fishing line with low specific gravity and high water repellency can be obtained compared to conventional fishing lines made of polyamide resin. In particular, it is extremely useful as a road thread for fishing of sharkfish.

  Hereinafter, the present invention will be described based on examples. Evaluation of monofilaments in the examples was performed according to the following method.

[Tensile strength and wet and dry knot strength]
Measurement was performed according to JISL1013.

[Apparent specific gravity measurement]
It carried out according to the definition of JISZ8807. That is, a sample piece cut into small pieces was submerged in a liquid, the specific gravity of the liquid was changed, the sample was adjusted so as to float in the liquid, and the specific gravity of the liquid was measured to obtain the apparent specific gravity of the sample.

[Interfacial peeling evaluation]
At the tip of a 5.5 mmφ stainless steel round bar (circular flat cross section), the crushing part is crushed by applying a force so that the width of the crushing part is about 2.5 times the thickness of the thread. By observing the degree of peeling at the interface with the naked eye, the following criteria were used.
○: No peeling observed with an optical microscope (magnification 40 times). X: Overall peeling observed with an optical microscope (magnification 40 times).

[Actual fishing evaluation]
We asked several anglers to evaluate actual fishing, and evaluated in the following two stages.
○… I was able to fish without any problems in terms of resistance, water repellency and strength of the road thread. ×… I was unable to continue fishing because of any problems in the resistance, water repellency and strength of the road thread. Or it was not suitable for fishing.

[Example 1]
Nylon 6 (M1021T manufactured by Toray, melting point: 222 ° C., specific gravity: 1.14, hereinafter referred to as N6) is used as a core component (80% by weight), and polyethylene (Ultzex 20100J, manufactured by Mitsui Chemicals), melting point: 120 ° C., specific gravity: 0.00. 92, hereinafter referred to as PE) as a sheath component (20% by weight), melted in an extruder-type composite spinning machine, and spun through a core-sheath composite die (hole diameter: 1.0 mm) having a cross-sectional shape of 8 cores, Furthermore, it cooled in 20 degreeC water.

  Next, this unstretched yarn was stretched in the first stage by 3.5 times in a steam stretching bath at 100 ° C., and further in the second stage by 1.7 times in a dry heat bath at 180 ° C. (total stretching ratio: 5. 6 times), and then passed through a dry heat bath at 180 ° C. at a treatment magnification of 0.9 times to carry out heat treatment, so that the diameter is 0.235 mm, the outer peripheral length T of the core and the peripheral length L of the circumscribed circle. A monofilament having the characteristics shown in Table 1 with a ratio T / L of 2.18 was obtained.

[Example 2]
In the same manner as in Example 1 except that the core-sheath weight ratio was 70/30 and the core-sheath composite die (hole diameter 1.0 mm) in which the cross-sectional shape of the core part had three leaves was used, the diameter 0.235 mm, A monofilament having the characteristics shown in Table 1 having a T / L ratio of 1.27 was obtained.

[Example 3]
The core component is a copolymer resin of nylon 6 and nylon 66 (Toray M6041, melting point: 195 ° C., specific gravity: 1.14, hereinafter referred to as N6 / 66), and the sheath component is a polypropylene resin (A5014 made by Union Polymer, melting point: 170). A monofilament having the characteristics shown in Table 1 having a diameter of 0.235 mm and a T / L ratio of 2.18 was obtained in the same manner as in Example 1 except that the temperature was changed to 0 ° C., specific gravity of 0.91, and hereinafter referred to as PP. Obtained.

[Example 4]
Nylon 6 and nylon 12 copolymer resin (7034T made by Ube Industries, melting point: 201 ° C., specific gravity: 1.11, hereinafter referred to as N6 / 12), sheath component changed to PP, and the core-sheath weight ratio A composite monofilament having the characteristics shown in Table 1 having a diameter of 0.235 mm and a T / L ratio of 1.21 was obtained in the same manner as in Example 1 except that the ratio was 95/5.

[Example 5]
The core component is changed to N6 / 12, the sheath component is changed to Hi Milan (Mitsui / Dupont Polychemical 1554Zn, melting point: 97 ° C., specific gravity: 0.95), and the core-sheath composite base has a star-shaped cross section. Table 1 with a diameter of 0.235 mm and a T / L ratio of 1.36 was used in the same manner as in Example 1 except that (hole diameter 1.0 mm) was used and the core-sheath weight ratio was 70/30. A monofilament having the above characteristics was obtained.

[Comparative Example 1]
In Example 1, the core-sheath component was replaced, and the core component was changed to PE, and the sheath component was changed to N6. In the same manner as in Example 1, the diameter was 0.235 mm and the T / L ratio was 1.92 in Table 1. A monofilament having the characteristics shown was obtained.

[Comparative Example 2]
In Example 1, the same conditions as in Example 1 were adopted except that the sheath component was polyvinylidene fluoride (Daikin VP832, melting point: 176 ° C., specific gravity: 1.78, hereinafter referred to as PVdF). A monofilament having the characteristics shown in Table 1 having 0.235 mm and a T / L ratio of 2.26 was obtained.

[Comparative Example 3]
In Example 1, the same as in Example 1 except that a core-sheath composite die (hole diameter 1.0 mm) having a round cross-sectional shape of the core part was used and the core-sheath weight ratio was 70/30. A monofilament having the characteristics shown in Table 1 having a diameter of 0.235 mm and a T / L ratio of 1.00 was obtained.

[Comparative Example 4]
In Example 1, except that the core-sheath composite die (hole diameter 1.0 mm) in which the cross-sectional shape of the core part is a triangle is used and the core-sheath weight ratio is 70/30, the same as in Example 1, A monofilament having the characteristics shown in Table 1 having a diameter of 0.235 mm and a T / L ratio of 0.84 was obtained.

[Comparative Example 5]
In Example 1, the same as in Example 1 except that a core-sheath composite die (hole diameter: 1.0 mm) having a cross-sectional shape of 10 cores was used and the core-sheath weight ratio was 70/30. A monofilament having the characteristics shown in Table 1 having a diameter of 0.235 mm and a T / L ratio of 2.72 was obtained.
Table 1 also shows the results of evaluating various properties using these monofilaments as fishing lines.

  As is apparent from the results in Table 1, the fishing line of the present invention (Examples 1 to 5) was improved in terms of interfacial peeling, and was excellent in low specific gravity and high water repellency compared to a fishing line made of polyamide resin. Demonstrate performance.

  On the other hand, among the fishing lines in which the core component and the sheath component deviated from the scope of the present invention, the fishing line (Comparative Example 1) in which the sheath component was N6 was reduced in strength due to water absorption and could not withstand long-term use. Moreover, although the fishing line (comparative example 2) which made the sheath component PVdF was excellent in water repellency, since the apparent specific gravity was high, when used for fishing, the resistance of the line increased and the bait could not be sunk naturally. .

  Moreover, among the fishing lines whose cross-sectional shape of the core part deviated from the range of the present invention, the fishing line having a T / L ratio lower than the range (Comparative Examples 3 and 4) caused interfacial peeling and could not withstand actual fishing. . Further, the fishing line (Comparative Example 5) having a T / L ratio exceeding the range of the present invention was insufficient in strength and did not endure actual fishing.

  As described above, the fishing line of the present invention has a core-sheath interface of a core-sheath composite monofilament mainly composed of a polyamide-based resin without causing problems such as a decrease in spinnability and occurrence of a breakage in the actual fishing line. Because of its improved peeling and low specific gravity and high water repellency, it is extremely useful as a modern fishing hook thread that sinks a light mechanism with an induction mechanism.

(A)-(c) is sectional drawing of a perpendicular direction with the fiber axis of the fishing line which satisfy | fills the conditions of this invention (D)-(f) is sectional drawing at the time of seeing the fishing line which does not satisfy | fill the conditions of this invention similarly to Fig.1 (a)-(c).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core part 2 Sheath part 3 Leaf crack part T The outer periphery length (mm) of the cross-sectional shape of a core
L Circumference of the circle circumscribing the cross-sectional shape of the core (mm)

Claims (6)

A core-sheath composite monofilament comprising a polyamide-based resin in the core and a polyolefin resin having a specific gravity of 1.0 or less in the sheath, the cross-sectional shape perpendicular to the fiber axis of the core being a plurality of leaf cracks Core-sheath composite monofilament comprising a multi-lobed cross section having a portion, and a ratio T / L of the outer circumferential length T of the multi-lobed section to the circumferential length L of the circumscribed circle of the outer circumference is in the range of 1.2 to 2.5 A fishing line characterized by comprising The fishing line according to claim 1, wherein the apparent specific gravity of the core-sheath composite monofilament is in the range of 1.0 to 1.1. The fishing line according to claim 1 or 2, wherein the core-sheath composite monofilament has 3 to 20 leaf cracks in the core. The fishing line according to any one of claims 1 to 3, wherein the polyolefin resin is polypropylene and / or polyethylene resin. The fishing line according to any one of claims 1 to 4, wherein a weight ratio of the core component / sheath component of the core-sheath composite monofilament is in a range of 95/5 to 70/30. The fishing line according to any one of claims 1 to 5, wherein the core-sheath composite monofilament has a tensile strength of 6.0 cN / dtex or more and a knot strength of 3.0 cN / dtex or more.

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