JPH01321957A - Fishnet - Google Patents

Abstract

PURPOSE:To obtain a fishnet outstanding in transparency and flexibility, resistant to developing mesh deviation at knotted parts by using conjugate monofilament with each specified melting point difference and sectional area ratio for the core polymer and sheath polymer. CONSTITUTION:(A) A polyamide polymer such as nylon 6 or nylon 66, 140-180 deg.C in melting point, as the sheath part 2, and (B) a second polyamide polymer with the melting point higher than that of the component A by >=20 deg.C, as the core part 1, are put to conjugate spinning into polyamide-based conjugate monofilament with the sectional area of the component A accounting for 10-30% of the total sectional area. These monofilaments are then netted and the resulting net is heat-set under tension to effect fusing of knotted parts, thus obtaining the objective fishnet.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fishing net made of monofilament thread and suitable for use in gill nets and the like.

Conventional technology Traditionally, fishing nets made of monofilament threads have been used to create fishing nets similar to underwater curtains. Although gillnets are most suitable for fishnets, they have the disadvantage that the knots that form the meshes are easily misaligned.In the case of gillnets, fish that are stuck in the meshes become violent in an attempt to escape. It is necessary to fix the knots of the fishing net so that they do not shift.In order to prevent the knots of the fishing net from shifting, protrusions are provided on the surface of the monofilament (Japanese Unexamined Patent Publication No. 61-124335). Cross section I rubbing (Utility Model Publication No. 48-15823, Japanese Unexamined Patent Publication No. 58-20138
Improvements to monofilaments such as 1) have been considered. In addition, knots are formed from single to double or triple knots, and adhesive resin is attached to the knitted net after it has been knitted.

Problems to be Solved by the Invention Among the above-mentioned means for preventing the misalignment of fishing nets, improvements in monofilament have not been able to sufficiently fix the knots, and the number of knots can also increase. Misalignment of the fish's eyes occurs and becomes thicker, but the nodule structure becomes complicated and productivity decreases, and the nodules become large and easily attract fish, causing them to be wary and reducing the catch. Also, when resin is fixed, the texture of the net fabric becomes hard,
There were problems such as yellowing during storage.

The present invention is intended to solve the above-mentioned problem, and is intended to solve the problem described above.
The purpose is to provide fishing nets suitable for this purpose.

Means for Solving the Problems In order to solve the above problems, the fishing net of the present invention has a core-sheath structure, the sheath part is made of a polyamide polymer having a melting point of 140°C or higher and lower than 180°C; The portion is made of a polyamide polymer whose melting point is 20°C or more higher than that of the polyamide polymer of the sheath portion, and the ratio of the sheath portion to the cross-sectional area is 1.
The net is knitted using 0 to 20% polyamide composite monofilament yarn.

Polyamide composite monolon 6 for knitting the fishing net of the present invention.
There are 66 and 12 copolymers, which can be used alone or in combination, and the melting point can be adjusted by selecting the copolymerization ratio of the copolymer. Since the core-sheath composite monofilament yarn uses the above-mentioned polyamide polymer for the core and sheath, it has excellent transparency, flexibility, and adhesiveness between the core and sheath. The polyamide polymer of the sheath has a melting point of 140°C or higher and lower than 180°C, and is 20°C lower than the melting point of the polyamide polymer of the core.
Use a lower one. After the knitting, the net fabric is tension-heated to apply a stronger stress than the node E to lightly fuse a part of the polyamide polymer in the sheath.
At this time, it is necessary to process the core within a temperature range that does not cause thermal deformation of the polyamide polymer. If the melting point of the polyamide-based polymer in the sheath is less than 140°C, the monofilament will soften and melt, causing stretching breakage and other problems, resulting in poor yarn-spinning properties, while if it is over 180°C, knots will form after the knitting network. The welding and fixing operation of the parts cannot be carried out smoothly. In addition, when welding and fixing knots after knitting, if we apply a fusion preventive agent such as a surfactant or oil to the braided fabric, we can prevent the parts of the net fabric outside the knots from fusing and fix the knots. Only the parts can be fused and fixed. In other words, since it is difficult for the anti-fusing agent to penetrate into the nodal areas where the monofilaments are in contact with each other, the contact surfaces between the monofilaments at the nodal areas are mainly fused, and the welding between the net legs of the net fabric is performed. does not occur. As the anti-fusing agent, a small amount of a dye, a surfactant, an oil agent, a water-soluble resin, etc. may be added.

If the polyamide polymer of the sheath is more flexible than the polyamide polymer of the core, it will be easier to fix the knot. That is, when a knot is formed using a monofilament yarn, if the surface of the monofilament yarn is flexible, it will be slightly deformed by the knot stress, so it is thought that there will be less misalignment of the knot. The ratio of the sheath portion to the cross-sectional area of the composite monofilament yarn needs to be in the range of 10 to 30%, and 10%
If it is less than 30%, the knots are insufficiently fixed, and if it exceeds 30%, the physical properties of the net fabric will deteriorate, making it unsuitable for practical use.

Function: In the above structure, the net fabric knitted using polyamide composite monofilament yarn is tension-heat set to apply stronger stress to the knots (1). At the contact portion l of the monofilament yarns, the sheath portions, which have a lower melting point than the core portion, may be partially fused together to prevent misalignment.

Example A concentric circular core-sheath type polyamide composite monofilament yarn as shown in FIG. Manufactured by. After melt spinning using a core-sheath type composite spinneret with a core spinning temperature of 265°C, a sheath spinning temperature of 210°C, and a hole diameter of 0.9 m111 and 36 holes, the bath temperature was 1.
The undrawn monofilament cooled and solidified in a 0°C cooling water bath was then drawn 3.8 times in a 70°C hot water bath, then 1.3 times in a hot air oven at 170°C, and then further drawn in a 170°C hot air oven. 1
Heat treated with 10% relaxation in a hot air oven at 80℃ for 15 minutes.
It was wound up at a speed of 0 m/9. The drawn monofilament obtained had a diameter of 0234 rru'n. The above method (
From this, the melting point of each polyamide-based polymer supplied to the core and sheath of a core-sheath type composite spinneret is determined by the change in copolymerization ratio (E) at core/sheath (1) 210°/160°C, +2) 2
10℃/140℃, f3) 200℃/160℃.

(4) 200℃/140℃ and the sheath area is 2
0% composite monofilament yarn and melting point 210℃/
A polyamide composite monofilament yarn having a sheath area of (5) 10%16) 30% at 160°C was produced. The physical property values are as shown in Table 1.

Each of the obtained polyamide composite monofilament yarns (1)
~(6), knit a mesh in the knot form of the double knot shown in FIG.
% stretched, treated in 80℃ hot water for 30 seconds with one trowel,
Conventional staining was then carried out at 85° C. for 60 minutes, followed by air drying.

Next, heat the mesh with high pressure steam 1 after stretching it by 95%.
The mixture was treated at 10° C. for 3 minutes to obtain a gill net fabric. The physical properties of each of the obtained net fabrics were measured, and the results are shown in Table 1.

Comparative Example Monofilament 1ζ was produced by spinning and drawing under the same procedure and conditions as in the above example. It is a core-sheath type polyamide composite monofilament, (1) nylon 6 has a melting point of 220℃/22o℃ in the core and sheath, (2) nylon 6 has a melting point in the core and nylon 6/66 copolymer has a melting point in the sheath. 220℃/2
10℃, (3) Nylon 6 core, nylon 6/66 copolymer sheath, melting point 220℃/2oo℃, (4) Nylon 6/66 copolymer core, nylon 6/12 copolymer. (E/ 160
The sheath area of ℃ is (5) 5%, +6140%,
and single monofilaments of (7) nylon 6, (8) nylon 6/66 copolymer, and (9) nylon 6/12 copolymer (however, the spinning temperature is (71), (8) is 265°C, (9) ) is 210℃).

These monofilaments were knitted into a net fabric in the same manner as in the above examples, and then dyed and stretched.

However, after dyeing and air-drying] immerse in a 30-fold diluted aqueous solution of chorozine resin (Nylon Fix LF 100, manufactured by Ota Kaken Co., Ltd.) for 5 minutes, dehydrate for 10 seconds in a centrifugal dehydrator, process the resin, and air dry. After the film was stretched by 95%, it was treated with high pressure steam at 110°C for 3 minutes. Also, (1).

(21, (3), (7), (8), (9)
The monofilament E was knitted in the triple knot form shown in Fig. 3, and the other conditions were the same as in Example 1.
This treatment was carried out to form a net fabric. The physical property values and mesh physical property values of each monofilament are listed in Table 1.

In Table 1, the tensile strength, knot strength, and Young's modulus of the monofilament physical properties were measured according to JISL-1013. In addition, among the physical properties of the net fabric, the hooking strength is a measure of the strength of the net fabric, and the reversal rate is a measure of the fixity of the knots of the net fabric. They were measured according to J ISL-1043, and were calculated using the following formula: Calculated from E.

To evaluate misalignment, measure the hooking strength of the fabric 20 times, and count the number of measurements when one knot misalignment (displacement of the knot) is observed before the knot is cut. Those in which misalignment occurred were indicated by ×, those in which misalignment occurred once or twice were indicated by △, and those in which no misalignment occurred were indicated by O.

As is clear from the results shown in Table 1, this example
In this case, each composite monofilament has high knot strength and excellent tensile strength, and the resulting net fabric has no mesh deviation and has an extremely high hooking strength. Comparative example] Here,
The melting point difference between the polyamide of the sheath and the polyamide of the core is 20
℃, Young's modulus is high and flexibility is low (11, (2
1) It is difficult to fuse the sheath part, causing misalignment, and the hooking strength of the net fabric is poor, and (4), the melting point of the polyamide in the sheath part is less than 140°C. On the other hand, if the melting point is 180°C or higher (
3) When processing the net fabric, the welding operation of the knots cannot be carried out smoothly, resulting in misalignment and poor hooking strength of the net fabric. In addition, in cases where the sheath area is less than 10% (5), monofilament with a single structure (7), (81), the fusion between the I and the knot during fabrication is insufficient, or there is no fusion at all. Because it does not fit, the mesh may be misaligned and the hooking strength of the net fabric will be poor, and it may become loose.
This is a monofilament of low melting point polyamide structure (
9) has poor tensile strength, knot strength, and mesh hooking strength, and (6), which has a sheath area of more than 30%, also has poor tensile strength,
The knot strength and the hooking strength of the net fabric are poor.

Effects of the Invention As described above, the fishing net of the present invention has a core-sheath structure, the sheath part is made of a polyamide polymer having a melting point of 140°C or more and less than 180°C, and the core part has a melting point higher than that of the sheath part. It is made of a polyamide polymer whose temperature is 20°C or more higher than the polyamide polymer of
%, it is made of heat-sealable polyamide composite monofilament yarn with excellent tensile strength and knot strength, so the knots of the net fabric after knitting can be easily fixed using conventional processing equipment. There is no need for a knotted structure or resin treatment to prevent slippage, the knots are small, have a good texture, do not slip off, have excellent hooking strength, are highly productive, and have excellent fishing performance. It is excellent.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of the polyamide composite monofilament used in the examples of the present invention, Fig. 2 is a schematic plan view showing the form of double knots in the knots, and Fig. 3 is a schematic plan view showing the form of triple knots in the knots. It is a schematic plan view showing a form. ■...Core part, 2...Sheath part.

Claims (1)

[Claims] 1. Has a core-sheath structure, and the sheath part has a melting point of 140°C or higher, 18
The core portion is made of a polyamide polymer having a melting point higher than that of the polyamide polymer of the sheath portion by 20° C. or more, and the ratio of the sheath portion to the cross-sectional area is 10 to 30°C. % fishing net knitted using polyamide composite monofilament yarn.