JP2012100551A - Fishing line and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fishing line made of a PVdF monofilament, having a high visibility and excellent strength characteristics at the same time, and capable of being more easily and inexpensively manufactured than conventional technologies.SOLUTION: The fishing line is made of the monofilament obtained by fusing and spinning polyvinylidene fluoride resin, and has such strength characteristics that the tensile strength is 600-760 MPa and that the knot strength is 475-550 MPa. The surface roughness of the monofilament is in the range from 2.5 μm to 7.5 μm, and the total light transmittance measured by a turbidimeter is 90% or less.

Description

  The present invention relates to a fishing line mainly made of a polyvinylidene fluoride resin and having high visibility and excellent strength characteristics.

  A synthetic resin monofilament made of a polyvinylidene fluoride resin (hereinafter referred to as a PVdF resin unless otherwise specified) is excellent in toughness, wear resistance, weather resistance, etc., and particularly has a high specific gravity (1.79). Since it is easy to sink in water, has little water absorption, and has high sensitivity when fish is caught, it has been suitably used as a fishery material, particularly as a fishing line.

  Also, in traditional fishing, fish movements were captured by the movement of floating, but the floating is highly visible, but it moves and is swept away by the influence of wind, waves, tides, etc. It was difficult to capture the faith and therefore made fishing difficult.

  With the diversification of fishing methods in recent years, a method of catching fish faith using the fishing line, especially the movement of the road line as an index, is adopted without using the float that is easily affected by wind, waves, tides, etc. As a result, visibility of fishing lines is now required.

  In recent years, the movement of fishing lines can be used to change the position of the device at the tip of the fishing line, to manipulate the movement of the device, and to determine the movement of the fish on the device. In such a method, good visibility is required for fishing lines.

  Therefore, as a method for improving the visibility of the fishing line, for example, by dyeing a PVdF resin monofilament, a color that is conspicuous at the fishing spot (for example, yellow, orange, pink, etc.) is added to enhance the color contrast (for example, However, in this method, the visibility is improved to some extent as compared with an uncolored fishing line, but the visibility is improved because the thread itself is transparent. The effect was not sufficient.

  Further, as a technique for solving this problem, for example, a fishing line using a core-sheath composite monofilament having a core part containing a plate-like filler pigment and a transparent sheath part (see, for example, Patent Document 2), A fishing line using a core-sheath composite monofilament having an opaque core part having at least one hollow structure and a transparent sheath part (for example, see Patent Document 3) is already known.

  However, although these fishing lines have good visibility, since they are composite yarns, the production method is difficult and the production cost is high, so it cannot be said that they are sufficiently satisfactory for industrial use. . Moreover, since these fishing lines contain solids such as plate-like fillers and titanium oxide, it was not possible to obtain sufficient strength, particularly knot strength, which is an important characteristic for fishing lines.

  On the other hand, a method of making a fishing line opaque by blending various polymers has also been studied. For example, a fishing line made of a monofilament in which a polyolefin / acrylic copolymer resin is added to a PVdF resin (for example, see Patent Document 4) has already been developed. Although known, the polyolefin / acrylic copolymer resin is a special copolymer, so it is difficult to use as a general-purpose polymer, and the polyolefin component is not compatible with PVdF resin. There is a problem that the resin tends to act as a foreign substance in the yarn, and the tensile strength of the obtained monofilament is lowered, which is not always sufficient for use as a fishing line.

Japanese Patent Application Laid-Open No. 07-252722 JP 09-209214 A JP-A-003-253527 JP 2002-227029 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 made of PVdF resin monofilament which has both high visibility and excellent strength properties and can be easily and inexpensively manufactured as compared with the prior art.

  In order to achieve the above object, the present invention comprises a monofilament obtained by melt spinning a PVdF resin, has tensile properties of 600 to 760 MPa, knot strength of 475 to 550 MPa, A fishing line having a surface roughness in the range of 2.5 μm to 7.5 μm and a total light transmittance measured by a turbidimeter of 90% or less is provided.

In the fishing line of the present invention,
The monofilament is colored;
It is a preferable condition that the monofilament is alternately and repeatedly provided with colored portions and non-colored portions at regular intervals in the longitudinal direction. When these conditions are satisfied, a further excellent effect is expected. can do.

  In the method for producing a fishing line of the present invention, when a monofilament made of PVdF resin is melt-spun, the drawing heat quantity index J represented by the formula J = d / (T × t) is 0 in the first drawing step. A stretching process is performed so as to satisfy a range of 0.5 to 2.0 μm / (° C. · s).

  In the above formula, d is the monofilament diameter (μm), T is the first stage stretching temperature (° C.), and t is the monofilament passage time (s) passing through the first stage stretching bath.

  The fishing line of the present invention has high visibility and excellent strength characteristics at the same time, and can be manufactured easily and inexpensively compared to the prior art, and is extremely useful when used for luer lines and road lines. Yes, these characteristics are exhibited without regret.

  Hereinafter, the fishing line of the present invention will be described in detail.

  The fishing line of the present invention comprises a monofilament obtained by melt spinning PVdF resin, has tensile strength of 600 to 760 MPa, knot strength of 475 to 550 MPa, and monofilament surface roughness of 2.5 μm to 7. The total light transmittance as measured by a turbidimeter is 90% or less.

  First, the PVDF resin used in the present invention is a polymer containing a vinylidene fluoride unit, such as a vinylidene fluoride homopolymer, a copolymer containing 70% by weight or more of vinylidene fluoride as a constituent unit, A mixture of coalescence is mentioned.

  Examples of the copolymerizable monomer with vinylidene fluoride units include ethylene tetrafluoride, propylene hexafluoride, ethylene trifluoride, ethylene trifluoride chloride, and vinyl fluoride. Use at least one of these. can do.

  In the fishing line of the present invention, the monofilament obtained by melt spinning the PVdF resin is required to have a tensile strength of 600 to 760 MPa, a knot strength of 475 to 550 MPa, and a tensile strength of 650 to 760 MPa. The knot strength is preferably 500 to 550 MPa.

  This is because when the tensile strength is below the above range, the strength of the straight portion is low, so it is difficult to apply to fishing lines. Conversely, when the tensile strength is above the above range, the polymer of the fiber surface layer is highly oriented. This is because the nodule strength tends to decrease.

  Also, if the knot strength is below the above range, the knots between the yarns or the yarn and the hook are weakened, making it difficult to apply to fishing lines. Because of this, it becomes technically difficult.

  Further, in the fishing line of the present invention, it is necessary that irregularities of various sizes are regularly or irregularly formed on the entire surface of the monofilament. When this is expressed by surface roughness, the numerical value is 2 It is necessary to be in the range of 0.5 μm to 7.5 μm, and it is more preferable to be in the range of 3.0 μm to 7.0 μm.

  This is because if the surface roughness of the fishing line is below the above range, the light is not easily diffused and the visibility is difficult to obtain. Conversely, if the surface roughness is above the above range, the strength is lowered, particularly the knot strength is reduced. It becomes easy.

  Furthermore, the fishing line of the present invention needs to have a total light transmittance of 90% or less as measured with a turbidimeter, and preferably has a total light transmittance of 85% or less. This is because when the total light transmittance is 90% or more, the opacity is insufficient, and it becomes difficult to obtain sufficient visibility.

  The PVdF resin monofilament used as the fishing line of the present invention can be obtained by generally known melt spinning, but has excellent strength characteristics and high visibility by forming various irregularities on the surface. In order to obtain a resin monofilament, in the first drawing step, the melting point of the polyvinylidene fluoride resin used in the first drawing bath temperature (T) is minus 5 to 20 ° C., more preferably minus 5 to 15 ° C. And the stretching calorimetric index J represented by the formula J = d / (T × t) is 0.5 to 2.0 μm / (° C. · s), more preferably 1.0 to 1.5 μm / (° C. -It is necessary to perform an extending | stretching process so that the range of s) may be satisfy | filled.

  In the above formula, d is the monofilament diameter (μm), T is the first stage stretching temperature (° C.), and t is the monofilament passage time (s) passing through the first stage stretching bath.

  That is, when trying to stretch the first stage at a temperature higher than the melting point of the PVDF resin used minus 5 ° C., the yarn melts in the drawing bath and the PVDF monofilament cannot be obtained. Conversely, the melting point of the PVDF resin used minus 20 ° C. Attempting to stretch the first stage at a lower temperature makes it difficult to obtain the effect of roughening the surface of the PVdF resin monofilament, resulting in insufficient opacity and difficulty in obtaining sufficient visibility. As a result, PVDF monofilament cannot be obtained.

  In general, when the surface of the monofilament is roughened due to foaming scratches or scratches, the strength is reduced. However, as in the present invention, in the first stretching process, the stretching heat quantity index J is applied so as to satisfy the above range. And the surface can be roughened while maintaining a strong specific.

  And, when the drawing treatment is performed so that the value of the drawing calorie index J is less than the above range, the tensile strength of the PVdF resin monofilament tends to be lowered, and sufficient strength characteristics cannot be maintained as a fishing line. When the stretching treatment is performed so as to exceed, it becomes difficult to obtain the effect of roughening the surface of the PVdF resin monofilament, and it becomes difficult to obtain sufficient visibility due to insufficient opacity.

  In the fishing line of the present invention, after the surface of the PVdF resin monofilament is roughened in the first drawing step, the total draw ratio is 5.5 to 7.0 times, preferably 6.0 to 6 in a hot gas bath. When multi-stage stretching is performed so as to be 5 times, a fishing line with higher strength characteristics can be obtained.

  In addition, the stretched PVdF resin monofilament may be appropriately subjected to constant length and / or relaxation heat treatment for the purpose of removing stretching strain.

  In the present invention, the entire PVdF resin monofilament may be colored in yellow, orange, pink, or the like by using an existing coloring / dying method, and the colored portion and the non-colored portion in the longitudinal direction of the PVdF resin monofilament. May be applied alternately with each other, or more than one color may be alternately colored in the longitudinal direction of the PVdF resin monofilament, thereby further enhancing the color contrast and further improving the visibility. To do.

  Further, the cross-sectional shape of the fishing line of the present invention is not necessarily limited to a circular cross section, and may be a polygonal cross section such as a triangular cross section or a square cross section, or an irregular cross section such as a multileaf cross section, depending on the purpose. Further, it may be subjected to secondary processing such as twisting PVdF resin monofilaments or twisting a single yarn.

  Further, the diameter of the fishing line of the present invention is not particularly limited. However, the fishing line is preferably preferably 0.05 mm to 1 mm, more preferably 0.1 mm to 0.7 mm from the viewpoint of visibility and strength characteristics.

  When the PVdF resin monofilament obtained in this way is used as a fishing line, it has higher visibility and superior strength characteristics compared to a conventional fishing line made of PVdF resin monofilament. Furthermore, it can be manufactured easily and inexpensively without using polyolefin / acrylic copolymer resins, etc., so it is extremely useful when used for luer lines and road yarns, and these characteristics are regrettable. Demonstrate.

  Hereinafter, the PVdF resin monofilament used as the fishing line of the present invention will be described based on examples. Physical property measurement of the PVdF resin monofilament and evaluation of the fishing line were performed according to the following methods.

[Tensile strength and knot strength]
It measured according to the prescription | regulation of JISL1013. In other words, a sample taken in a bowl shape was left in a temperature / humidity adjustment chamber at 20 ° C. and 65% RH for 24 hours, and then, using a “Tensilon” RTM500 type tensile tester manufactured by Orientec Co., Ltd., yarn length: 250 mm, tensile speed : Measured under conditions of 300 mm / min, and the tensile strength (cN / dtex) was determined by dividing the cutting strength (N) by the fineness (dtex).

[diameter]
The diameter of the PVdF resin monofilament was randomly measured with a digital micrometer (manufactured by MITUTOMO) at five points, and the average value was displayed.

[Surface roughness]
Using the “Digital Microscope VHX-500F” manufactured by Keyence Corporation, the surface of the yarn was magnified 700 times and photographed in 3D mode, and the image was 302.5 μm parallel to the fiber axis of the PVdF resin monofilament in profile mode. The unevenness on the surface of the yarn in the range was measured, the difference where the height difference was the largest was determined, and this was defined as the surface roughness.

[Total light transmittance]
PVdF resin monofilaments were arranged in a horizontal line without any gap on a mount having a square hole of 17 mm square in the center, and fixed with tape to prepare a measurement sample. This measurement sample was set on a turbidimeter NDH2000 manufactured by Nippon Denshoku Industries Co., Ltd., and the total light transmittance was measured.

[Visibility]
We asked several anglers to evaluate actual fishing, and evaluated in the following two stages.
○… It was fully visible at the fishing spot,
×: Visible at the fishing spot.

[Actual fishing test]
Actually, 10 anglers used the fishing line of the present invention to perform spatula fishing, and the use feeling at the time of fishing was judged according to the following criteria.
○ ... I was able to catch a big fish without any problems,
× ・ ・ ・ When I hung the fish, I lost the fishing line.

[Example 1]
PVdF resin pellets (manufactured by Daikin, VP835: melting point = 176 ° C.) were supplied to an extruder spinning machine, melted and kneaded at a spinning temperature of 260 ° C., and a polymer melt was spun from the spinneret.

  Then, this polymer melt is cooled and solidified in a polyethylene glycol solution at 20 ° C. to obtain an unstretched yarn, and this unstretched yarn is further stretched 4.5 times in a polyethylene glycol bath at a stretching bath temperature of 162 ° C. Went. The drawing bath passing time at this time was 0.76 seconds, and the drawing heat quantity index J was 1.79 μm / (° C. · s).

  Next, an intermediate heat treatment of 0.95 times was carried out in a polyethylene glycol bath at 155 ° C., and further, the second stage drawing was carried out in a dry heat bath at 180 ° C. so that the total draw ratio was 6.4 times. Thereafter, 0.90 times heat treatment was performed in a dry heat bath at 155 ° C. to obtain a PVDF resin monofilament having a diameter of about 0.22 mm.

[Example 2]
A dyeing solution containing 2.5% by weight of a conjugated cationic dye (Basacryl BrilliantRedBG manufactured by BASF) was applied to the entire PVDF resin monofilament obtained in Example 1, and the treatment magnification was 1.00 in a dry heat bath at 150 ° C. After double curing, excess dye was washed away to obtain a colored PVdF resin monofilament having a diameter of 0.22 mm.

[Example 3]
In the longitudinal direction of the PVD resin F monofilament obtained in Example 1, 2.5% by weight of a conjugated cationic dye (Basacryl Brilliant Red BG manufactured by BASF) was added to the dyed part so that a dyed part and a non-dyed part appeared at intervals of 500 mm. The blended dyeing solution was applied and cured in a dry heat bath at 150 ° C. at a treatment magnification of 1.00 times, and then the excess dye was washed away to obtain a partially dyed PVdF monofilament having a diameter of 0.22 mm.

[Example 4]
A diameter of 0.22 mm was obtained in the same manner as in Example 1 except that the stretching bath passage time was increased by extending the length of the first-stage stretching bath, and the stretching calorie index J was changed as shown in Table 1. Of PVdF resin monofilament was obtained.

[Comparative Example 1]
The diameter in the same manner as in Example 1 except that the length of the drawing bath was shortened by changing the length of the first drawing bath to change the drawing calorie index J as shown in Table 1. A 0.22 mm PVdF resin monofilament was obtained.

[Comparative Example 2]
By extending the length of the first drawing bath, the drawing bath passage time was increased, and the drawing heat quantity index J was changed as shown in Table 1, and the diameter was about 0. A 22 mm PVdF resin monofilament was obtained.

[Comparative Example 3]
The whole PVDF monofilament obtained in Comparative Example 1 was coated with a dye solution containing 2.5% by weight of a conjugated cationic dye (Basacryl Brilliant Red BG manufactured by BASF) and treated at a processing rate of 1.00 times in a 150 ° C. dry heat bath. After curing, excess dye was washed away to obtain a colored PVdF resin monofilament having a diameter of 0.22 mm.

[Comparative Example 4]
An attempt was made to obtain a PVdF resin monofilament having a diameter of about 0.22 mm in the same manner as in Example 1 except that the melting temperature of the PVDF resin using the first stage drawing temperature was set to a temperature higher than minus 5 ° C. Since the yarn was melted in the eye drawing bath, a monofilament could not be obtained.

[Comparative Example 5]
An attempt was made to obtain a PVdF resin monofilament having a diameter of about 0.22 mm in the same manner as in Example 1 except that the melting temperature of the PVDF resin using the first drawing temperature was set to a temperature lower than -20 ° C. Monofilament could not be obtained because the yarn was broken in the eye drawing bath.

[Comparative Example 6]
A diameter of about 0.00 mm was obtained in the same manner as in Example 1 except that the first stage drawing temperature was set to a temperature lower than the melting point of PVDF resin minus 20 ° C. and the bath length was increased to obtain the drawing calorie index J. A 22 mm PVdF resin monofilament was obtained.

  Table 1 shows the physical property measurement results of the obtained PVdF resin monofilament and the actual fishing evaluation results when this is used as a spatula thread.

  As is clear from the results in Table 1, the fishing line of the present invention (Examples 1 to 4) has both high visibility and excellent strength characteristics at the same time, and is superior to the conventional fishing line. I understand.

  On the other hand, the fishing line (Comparative Example 1) in which the drawing heat amount index J at the first stage drawing is larger than the range specified in the present invention by changing the drawing bath length is insufficient for the knot strength because the heat quantity at the first stage drawing is insufficient. In the actual fishing test, not only the feeling of use becomes worse, but also the effect of roughening the surface of the PVdF resin monofilament at the first stage of stretching cannot be obtained, so the surface roughness becomes small and visible in the actual fishing test. I got worse.

  In addition, the fishing line (Comparative Example 2) in which the drawing heat amount index J at the time of first-stage drawing becomes smaller than the range defined in the present invention by changing the drawing bath length is too much heat at the time of first-stage drawing. Further, the tensile strength was lowered, and the effect of roughening the surface of the PVdF resin monofilament was too high, so that the knot strength was lowered, and the usability was deteriorated in the actual fishing test.

  Furthermore, the fishing line (Comparative Example 3) dyed PVdF resin monofilament with less surface roughness and inferior visibility has a slightly improved visibility due to the color contrast with the fishing spot, but is a transparent thread. It was difficult to see depending on the weather.

  When the temperature of the PVDF resin using the first-stage drawing temperature is set to a temperature higher than minus 5 ° C. (Comparative Example 4), the temperature of the first-stage drawing bath is too high. As a result, a stretched monofilament could not be obtained.

  On the other hand, when the melting temperature of the PVDF resin using the first stage stretching temperature is set to a temperature lower than minus 20 ° C. (Comparative Example 5), the first stage stretching bath temperature is insufficient, the yarn breaks during stretching, and the stretched monofilament Couldn't get.

  In addition, the fishing line (Comparative Example 6), which is set at a temperature lower than the melting point minus 20 ° C. of the PVDF resin using the first stage stretching temperature and lengthens the bath length and earns the stretch calorie index J, is compared with the total one-stage stretching. Although the amount of heat was sufficient, yarn breakage did not occur, but the absolute temperature during the first stage stretching was insufficient, resulting in a lower knot strength, and in the actual fishing test, the feeling of use became worse, and the first stage stretching Since the effect of roughening the surface of the PVdF resin monofilament is sometimes not obtained, the surface roughness is reduced and the visibility is deteriorated in the actual fishing test.

  As described above, the fishing line of the present invention has high visibility and excellent strength characteristics as compared with the conventional fishing line made of PVdF resin monofilament, and can be manufactured easily and inexpensively compared with the conventional technique. When used as a luer line or road thread, its performance can be fully demonstrated.

Claims (4)

It consists of a monofilament obtained by melt spinning a polyvinylidene fluoride resin, has a tensile strength of 600 to 760 MPa, a knot strength of 475 to 550 MPa, and a monofilament surface roughness of 2.5 μm to 7.5 μm. A fishing line having a total light transmittance of 90% or less as measured by a turbidimeter. The fishing line according to claim 1, wherein the monofilament is colored. The fishing line according to claim 1 or 2, wherein colored portions and non-colored portions are alternately and repeatedly applied to the monofilament at regular intervals in the longitudinal direction. When melt spinning a monofilament made of a polyvinylidene fluoride resin, in the first drawing step, the drawing heat quantity index J represented by the formula J = d / (T × t) is 0.5 to 2.0 μm / (° C. The method for producing a fishing line according to any one of claims 1 to 3, wherein a drawing process is performed so as to satisfy the range of s).
In the above formula, d is the monofilament diameter (μm), T is the first stage stretching temperature (° C.), and t is the monofilament passage time (s) passing through the first stage stretching bath.