JPH11262337A - Knotless net for seaweed culture - Google Patents

Abstract

(57) [Summary] [Problem] To provide a seaweed cultivation net having excellent adhesion and growth of nori buds and the like, no problem of nodule tightening, high strength, and good durability. SOLUTION: The knotless net for cultivating seaweed of the present invention comprises a raw yarn having a single fiber fineness of 50 to 1000 deniers of at least 6 yarns.
A net yarn made of a twisted yarn or a mixed twist yarn containing 0% by weight is finished so that the knot form is a knotless net.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knotless net used for cultivating seaweeds such as laver and mozuku. The present invention relates to a knotless seaweed cultivation net having a nodule structure which has no knot tightening problem and has high strength and good durability.

[0002]

2. Description of the Related Art The characteristics required for seaweed cultivation nets such as nori nets and mozuku cultivation nets are that they have good adhesion and growth of spores such as nori sprouts, and that they have high strength and good durability. And the like.

[0003] For example, in the case of a floating type laver net, what is woven with a mesh yarn obtained by twisting polyvinyl alcohol (vinylon) monofilament and polyamide multifilament is often used. In other words, vinylon monofilaments are used because of their excellent adhesion of nori buds and the like. On the other hand, polyamide multifilament yarns are used because only vinylon monofilaments have low netting strength and polyamide multifilaments are used. This is to supplement the strength with a filament.

[0004] In recent years, instead of the twisted yarn of the vinylon monofilament and the polyamide multifilament, for example, in order to further increase the net strength of the seaweed aquaculture net and to improve the durability of the net, for example, a special twisted yarn is used. Fairness 7
As described in JP-A-8188 and Jpn. Pat. Appln. KOKAI Publication No. 61-142878, the adhesiveness of nori sprouts and the like is improved by imparting hygroscopicity to polyamide fibers, and replacement of vinylon fibers is intended, or Attempts have been made to reduce the twist ratio of vinylon fibers by mixing and twisting vinylon fibers, polyamide fibers imparted with hygroscopicity and ordinary polyamide yarns to improve the strength and durability of the netting. .

[0005] However, in the above-mentioned conventional improvement method, particularly when vinylon fibers or polyamide fibers imparting hygroscopicity are monofilaments having a large single-filament fineness, if the ratio of monofilaments in the net yarn is increased, nodules of the net are formed. There was a problem that it was difficult to tighten and loosened easily.

[0006] If the twist ratio of vinylon monofilament or polyamide monofilament provided with hygroscopicity is small, or if the single fiber fineness of the polyamide fiber provided with hygroscopicity is small, the problem of loosening of the net does not occur. , Not only the strength is reduced and the net is easily stained,
There was a problem that the net became difficult to dry.

[0007] Accordingly, it is a reality that a net for cultivating a seaweed which has solved these drawbacks has been desired.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been achieved as a result of studying to solve the above-mentioned problems in the prior art, and has excellent adhesion and growth of nori buds and the like, An object of the present invention is to provide a seaweed cultivation net having high strength without a problem of tightness and excellent durability.

[0009]

In order to achieve the above object, the knotless net for cultivating seaweed of the present invention has a single fiber fineness of 5%.
A twisted or mixed-twisted yarn containing at least 60% by weight of a 0 to 1000 denier yarn is finished so that the knotting form is a knotless net.

[0010] In the knotless net for cultivating seaweed of the present invention, the twist coefficient K of the net yarn is 2000 to 3500.
The contact angle of the raw yarn with water measured by the Wilhelmy method is 70 degrees or less, and the raw yarn is made of a synthetic resin containing 0.2 to 30% by weight of polyetheresteramide, particularly polyamide. That the mesh yarn is a twist yarn consisting of only the original yarn, and that the mesh yarn is a mixed twist yarn comprising 60% by weight or more of the original yarn and 40% by weight or less of polyvinyl alcohol monofilament and / or multifilament. These conditions are preferable, and by applying these conditions, it is possible to expect a further excellent effect to be exhibited.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The knotless net for culturing seaweed of the present invention will be described below in detail.

In the present invention, a knotted knotless mesh is a round shape that forms a mesh while twisting a net yarn.
Or it is knitted by a vertical knotless knitting machine,
This excludes the Russell net and the Mojiko net, which are widely referred to.

In general, frogs or knotted nets are used for laver nets. These frogs or knotted nets have advantages such as a high knitting speed (high productivity), a completely fixed knotted portion, and a low tendency to slip. On the other hand, there is a disadvantage that the nodes become bulky due to swelling. In particular, when using a fiber having a large single-filament fineness as a mesh yarn, the yarn is hard, so the knot becomes difficult to tighten and the knot portion becomes large, and the knot is displaced and deformed when handling the netting. There is. This tendency increases as the single-fiber fineness increases, or as the mixing ratio of the single-fiber fineness increases when the fibers having a high single-fiber fineness and other fibers are mixed and twisted.

On the other hand, the knotless knitting network is formed by twisting (or twisting) the net yarns while intertwisting them to form a net. Although it is slow, it does not become bulky because the knot cannot swell like a frog or knot net. This characteristic is the same even if the single-fiber fineness is large or the mixing ratio of the yarn with the large single-fiber fineness is large.
In addition, knotless nets are characterized by a higher net strength than frogs or knotted nets. In other words, frogs and knotted nets are always cut from the knotted part when the net is cut, and the knotted part's strength depends on the raw material, the number of plying yarns, the number of twists, etc. Is about 50 to 60%, but the knotless net is also cut from the intersection forming the mesh, but the strength retention rate for the portion other than the intersection is 90% or more, and the netting using the same yarn is used. If so, it is nearly twice as powerful as a frog or knotted net. Therefore, particularly when using a yarn having a large single-filament fineness, a knotless net is more advantageous in strength than a frog or knotted net.

In manufacturing the knotless net of the present invention,
In particular, the number of twists of the net yarn is important. In general, nets such as laver nets are made by twisting and then twisting. In the case of frogs or knotted nets, the knot is fixed even if the number of twists in the twist is lower. Therefore, the knot portion does not shift, but in the case of a knotless net, there is a problem that if the number of twists is small, the knot portion deviates from the intersection of the net yarn. That is, the shape of the knotless net is maintained by the number of twists of the net yarn, particularly the number of twists.
And if the diameter of the mesh yarn is the same, when the original yarn with a large single yarn fineness is plied, the number of single yarns is smaller than that of the original yarn with a small single yarn fineness, and Since the contact area of the single yarn is small, slippage easily occurs between yarns. Therefore, when using a large number of yarns having a large single-filament fineness, it is necessary to increase the number of ply twists of the knotless net so as to prevent the knitting from shifting. However, when the number of ply twists is increased while the number of ply twists is kept constant, the twist balance between the ply twist and the ply twist becomes worse, resulting in kink or winding in the direction in which the twist becomes stable when the net is stretched. In addition, workability is extremely reduced.

The twist balance between the upper twist and the lower twist in the knotless net is such that the twist ratio of the upper twist / primer twist is usually about 0.4 to 0.6. Therefore, in the case of a knotless net, it is necessary to increase the number of ply twists in order to knit a net that is less likely to be displaced and has a good balance. The number of priming is the thickness (diameter) of the mesh yarn
Therefore, it is convenient to indicate with a twist coefficient excluding the effect of thickness. The twist coefficient K at the time of the bottom twist is represented by the following equation.

[0017]

(Equation 1) T: The number of ply twists per 10 cm D: The yarn fineness at the time of ply twist Normally, in the case of a frog or knotted net, the twist coefficient K is 1600 to 200.
It is about 0. However, the twist coefficient K of the knotless net of the present invention using a large number of fibers having a large single-filament fineness is 2,000 to 35.
It is preferably about 00, and most preferably 2200 to 3000. The reason is that if the twist coefficient K is lower than 2,000, the number of upper twists in a well-balanced state is also low, resulting in misalignment of the netting. Conversely, if the twist coefficient K is higher than 3500, the twisted mesh This is because the decline in the strength of the earth becomes too large. Here, the twist coefficient K is obtained from the net of the finished product. If the knotless net has two structures, ie, the lower twist and the upper twist, it indicates the time of the lower twist, and the knotless net is the lower twist and the middle twist. In the case of a three-layered structure, a middle twist is shown.

The twisting coefficient K is measured by a twist detector according to JIS-L1034.
In accordance with (Testing method of nylon filament for fishing nets), fix between the chucks with a test length of 25 cm, untwist the upper twist, measure the length between the chucks after untwisting the upper strand, and perform the priming or medium twisting. The twist can be untwisted, and the number of twists can be determined by dividing the number of twists by the inter-chuck length after untwisting.

In the knotless net for cultivating seaweeds of the present invention, a single yarn having a fineness of 50 to 1000 denier is used, and a twisted or mixed twisted yarn containing 60% by weight or more in the mesh is used. It is characterized by a net yarn, which is an important condition in order to combine each of the drying characteristics of the net yarn, the prevention of dirt, the adhesion of laver sprouts, and the high strength.

That is, the currently used vinylon monofilament has extremely good adhesion of laver spores and the like, and has a single-fiber fineness of about 500 denier, but has low tensile strength and knot strength, and low bending fatigue. There is a disadvantage that it is bad. For this reason, even if the twist ratio of the vinylon monofilament is increased to 60% by weight or more, the drying property and the prevention of dirt of the net yarn can be improved, but the strength cannot be improved and the durability of the netting is rather lowered, which is not preferable. .

Therefore, by mixing and twisting with a monofilament having a higher strength than vinylon fiber or a yarn having excellent adhesion of laver spores equal to or higher than vinylon fiber, the drying property, antifouling property, laver sprout of the above-mentioned mesh yarn can be obtained. It is necessary to obtain a netting which has both adhesion and strength.

However, if fibers having a single yarn fineness of more than 1000 denier are twisted into the net yarn at 60% by weight or more, the net strength is too large and the net fabric is bulky even if it is a knotless net. It is not preferable because it is hard and difficult to handle. Further, fibers having a single yarn fineness of less than 50 denier
When mixed by more than 0% by weight, after laminating spores on the net, it takes too much time for the net to dry in the drying process at the time of raising seedlings. It is not preferable because it tends to adhere to the seaweed and tends to alienate the growth of nori sprout.

In the present invention, the single yarn fineness is 50 to 100.
The 0-denier yarn can be mixed and twisted appropriately in combination with various yarns in consideration of the flexibility and strength of the mesh yarn, the adhesion of laver spores, and the like. Single yarn fineness is 50-22
A 0 denier yarn may be used 100%, that is, it may be used as a twisted yarn consisting of only 100%. However, in the case of a single yarn fineness of 220 denier to 1000 denier, drying at the time of drying is too fast for buds. Since burning may occur, the twist ratio with other yarns is preferably about 60 to 70% by weight.

As a means for twisting a raw yarn having a single yarn fineness of 50 to 1000 denier into a mesh yarn by 60% by weight or more, for example, two types of vinylon monofilament and another monofilament having higher strength than vinylon are twisted. Polyester monofilaments may be further added to improve drying property.

Among them, a monofilament of 400 to 500 denier having a high strength and excellent adhesion of laver spores has a monofilament of about 60 to 70%, and a conventional single filament fineness of 30%.
It is most preferred that a multifilament nylon multifilament having a denier is twisted to form a net yarn.

The yarn of the present invention, such as a monofilament, has a water contact angle of 7 as measured by the Wilhelmy method.
It is desirable that it is 0 degrees or less. That is, a yarn having a low contact angle with water has excellent adhesion of spores such as laver, and more preferably a yarn having many small irregularities on the surface of a fiber is most preferable. This is because if there are many small irregularities on the surface of the fiber, spores such as seaweed and the like will not easily fall off under the influence of waves. The method of forming small irregularities on the fiber surface may be based on the shape of a die used at the time of spinning.For example, in the case of nylon monofilament, ethylene bisphthalamide as a crystal inhibitor used for the purpose of obtaining transparency May be omitted.

The term "contact angle with water" as used in the present invention refers to the surface tension (σ) when a single yarn is put into or pulled out of a liquid.
The force acting on the single yarn is (F), the fiber diameter is (d),
When the contact angle is (θ), this is a value derived from the equation F = πdσcosθ. That is, it is a value derived by the Wilhelmy method of calculating the contact angle (θ) by calculating the resistance (F) when a single yarn is put into or pulled out of a liquid with a microbalance.

The contact angle of the Wilhelmy method includes an advancing contact angle obtained from the surface tension when a sample (single yarn) is put into a liquid and a receding contact angle obtained from the surface tension when the sample (single yarn) is drawn out of the liquid. Are indicated by advancing contact angles. The contact angle can also be measured by attaching a water drop (ion-exchanged water) to the surface of the plate with a microcylinder and reading the angle with a goniometer of Elma Optical Co., Ltd. Although the degree corresponds to 65 degrees in the water drop method, it is difficult to measure by the water drop method particularly when the diameter of a single yarn is small, so it is preferable to use the Wilhelmy method.

When the contact angle of the yarn is larger than 70 degrees,
Even if the surface of the yarn has irregularities, it is not preferable because the attached seaweed spores and the like tend to fall off.

There are various methods for obtaining a yarn having a contact angle with water of 70 degrees or less. In other words, originally high hygroscopicity like vinylon fiber,
A material having a low contact angle may be used.
As described in JP-A-8188, a method of post-processing with a substance which improves the hygroscopicity and lowers the contact angle is disclosed in, for example, Japanese Utility Model Application Laid-Open No. 61-142878 and Japanese Patent Application Laid-Open No.
As described in JP-A-193637, a fiber obtained by a method of kneading a material having high hygroscopicity into a polymer and spinning it together may be used as a material. However,
When kneading a highly hygroscopic substance into a polymer, it is necessary that the highly hygroscopic substance to be kneaded is not colored, and the fibers after kneading are not colored.
If the fibers are colored, it is difficult to see the spores when judging the adhesion state during the operation of attaching the spores such as laver and it is difficult to attach an appropriate number of the spores.

Further, when kneading a highly hygroscopic substance, a substance which exhibits an effect with a small amount of kneading rate should be selected as the high hygroscopic substance to be kneaded in order to make it difficult to lower the strength of the yarn. It is desirable to do.

The use of a polyetheresteramide is preferred as a material which can greatly reduce the contact angle with water at a small kneading rate and is hardly colored during and after spinning.

The polyetheresteramide is a block copolymer having an ether bond, an ester bond and an amino bond in the same molecular chain, and is more particularly selected from lactams, aminocarboxylic acids and salts of diamines and dicarboxylic acids. A block copolymer obtained by subjecting one or more polyamide-forming components (A) and a polyetherester-forming component (B) composed of dicarboxylic acid and poly (alkylene oxide) glycol to a polycondensation reaction. is there.

The kneading ratio of this polyetheresteramide to the raw yarn-forming polymer is 0.2 to 30% by weight.
More preferably, it is 1 to 15% by weight.

As the base polymer of the yarn into which a highly hygroscopic material is kneaded, for example, polyetheresteramide, polyamide or polyester having high strength after spinning is preferable, particularly nylon 6, nylon 66, nylon 6 and nylon 66. A copolymer obtained by copolymerization of nylon 6 and nylon 66 is particularly preferred, and a copolymer of nylon 6 and nylon 66 having high strength and flexibility of the raw yarn is particularly preferred.

The raw yarn of the present invention can be obtained by a known method of mixing and spinning polyamide with an extruder spinning machine, for example, using a master batch obtained by adding polyetheresteramide to polyamide. It is not something to be done.

Thus, the single yarn fineness is 50 to 1000
The knotless net for seaweed cultivation of the present invention, in which a knitted yarn composed of a twisted yarn or a mixed twisted yarn containing at least 60% by weight of denier yarn is finished so as to form a knotless netting,
It has excellent adhesion and growth properties of laver buds, etc. and has excellent properties of high strength without dangling problems and good durability, and by utilizing these characteristics, it has excellent characteristics such as laver and mozuku. It can be preferably used as a culture net.

[0038]

The present invention will be described in more detail with reference to the following examples. In addition, each evaluation characteristic in this example was measured by the following method.

[Net yarn fineness] It was determined from the weight of a net yarn having a length of 1 m.

[Mesh thread diameter] Measured under the condition of an initial load of 100 g / cm ² using a compression elasticity tester manufactured by Nakayama Electric Industry Co., Ltd. [Strength of mesh thread] A knot or an intersection according to JIS-L1034. Was included in the center of the sample.
In addition, as a method of expressing the degree of tightness of the nodule, the size of the nodule or intersection was measured with a magnifying glass.

[Moisture content after drying] The nets cut to a length of 1 m were immersed in water for 24 hours, and a sample was taken out in an atmosphere where the temperature and humidity were adjusted to a standard state and suspended vertically.
It was indicated by the water content at the elapse of minutes. The water content is shown by the following equation. Water content = weight after wet-dry weight / dry weight × 100 (%): The higher the water content, the longer the drying time.

[Adhesiveness of Nori Sprouts] Seeds were placed in artificial seawater at 17 ° C., and the samples were immersed for a certain period of time in a state in which spores were released. Are counted and expressed.

[Size of Nodule or Intersection]
In a state of being spread in the vertical direction, the length in the vertical direction (a) and the length in the horizontal direction (b) were measured, and an initial load of 100 g / cm ² was measured using a compression elasticity tester manufactured by Nakayama Electric Industry Co., Ltd. The thickness (c) was measured under the conditions and indicated by the value of a × b × c.

Example 1 Single yarn fineness was 440 denier,
The knot strength is 5.1 g / d, the contact angle with water measured by Wilhelmy method is 67 degrees, and nylon 6 and nylon 66 containing 4% by weight of polyetheresteramide are 95: 5.
A monofilament made of a nylon 6/66 copolymer having a weight ratio of
Using a round knotless knitting machine manufactured by Chuo Zoki Co., Ltd., a knitting yarn obtained by mixing and twisting 16 nylon 6 multifilament yarns of 450 denier 15 filaments (having a single yarn fineness of 30 denier) was used, and a lower twist coefficient K = In 2200, knit the net into two children.
After setting in a hot water at 0 ° C. for a fixed length of 3 minutes, the mixture was air-dried to obtain a knotless net having a monofilament yarn having a twist ratio of 64.7% by weight. Table 1 shows the results of evaluating various performances of the knotless network.

[Example 2] A knitted yarn consisting of a twisted yarn using 46 monofilament raw yarns used in Example 1 was knitted, set and air-dried in the same manner as in Example 1 to obtain a knotless knitted fabric. Obtained. Table 1 also shows the results of evaluating various performances of the knotless network.

Example 3 Fourteen monofilament yarns used in Example 1, 12 vinylon monofilament yarns having a single yarn fineness of 500 denier, and 450 denier single yarn fineness of 30 denier used in Example 1 A knitting yarn obtained by mixing and twisting 18 denier nylon 6 multifilament yarns,
By knitting, setting and air-drying in the same manner as in Example 1,
A knotless net having a mixing ratio of the monofilament yarn of 60% by weight was obtained. Table 1 also shows the results of evaluating various performances of the knotless network.

[Comparative Example 1] 15 monofilament raw yarns used in Example 1, 12 vinylon monofilaments having a single yarn fineness of 500 denier, and 18 nylon 6 multifilament yarns having a single yarn fineness of 30 denier were used. After the twisted knitting yarn is twisted with a ring twisting machine at a twisting coefficient K = 1700, a twisting is performed at a ratio of 0.48 to the twisting to obtain a three-ply twisted yarn, which is manufactured by Toyo Kogyo Co., Ltd. The knitting rate of the monofilament yarn is 60.9% by weight by knitting with a frog or a knitting machine made of stainless steel and setting and air-drying in the same manner as in Example 1.
I got a frog or knotted net. Table 1 also shows the results of evaluating various performances of this frog or knot network.

Comparative Example 2 A raw vinylon monofilament yarn having a denier of 500 denier used in Example 3 was used.
The knitting yarn obtained by mixing and twisting the book and 28 nylon 6 multifilament yarns having a denier of 450 denier and a single yarn fineness of 30 denier used in Example 1 was knitted in the same manner as in Example 1;
By air-drying, a knotless net having a twist ratio of the above vinylon monofilament yarn of 38.8% by weight was obtained. Table 1 also shows the results of evaluating various performances of the knotless network.

[0049]

[Table 1] As is clear from the results in Table 1, the knotless network of the present invention is:
Compared to the conventional frog or knot net (Comparative Example 1) and the knotless net having a low twist ratio of the monofilament yarn (Comparative Example 2), the strength, moisture content after drying, adhesion of laver buds and knot tightness are more balanced. Excellent.

[0050]

As described above, the knotless net for cultivating seaweeds of the present invention has excellent adhesion and growth of nori buds and the like, and has high strength of the netting so that it is difficult to break the net and has high durability. It is excellent in that it is excellent in that it does not shift during handling of the netting, that it has no knots, it has a small bulk, that the net yarn has excellent drying properties, and that it is difficult for dirt to adhere during use. It has characteristics and can be preferably used as a net for aquaculture such as laver and mozuku by utilizing these characteristics.

Claims (8)

[Claims] 1. A net yarn comprising a twisted yarn or a mixed twist yarn containing at least 60% by weight of a raw yarn having a single yarn fineness of 50 to 1000 denier is finished so as to form a knotless knotted mesh. Knotless net for seaweed cultivation. 2. The twist coefficient K of the net yarn is 2000 to 35.
The knotless net for cultivating seaweeds according to claim 1, characterized in that it is in the range of 00. 3. The knotless net for cultivating seaweeds according to claim 1, wherein a contact angle of the raw yarn with water measured by a Wilhelmy method is 70 degrees or less. 4. The marine algae culture according to claim 1, wherein the raw yarn is made of a synthetic resin containing 0.2 to 30% by weight of polyetheresteramide. Knotted net. 5. The knotless knot for cultivating seaweed according to claim 1, wherein the raw yarn is made of a polyamide containing 0.2 to 30% by weight of polyetheresteramide. network. 6. The knotless net for cultivating seaweeds according to claim 1, wherein the mesh yarn is a twist yarn consisting of only the raw yarn. 7. The yarn according to claim 1, wherein the mesh yarn is a twisted yarn comprising 60% by weight or more of the raw yarn and 40% by weight or less of polyamide monofilament and / or multifilament. The knotless net for cultivating seaweed according to the above item. 8. The yarn according to claim 1, wherein the mesh yarn is a twisted yarn comprising 60% by weight or more of the raw yarn and 40% by weight or less of polyvinyl alcohol monofilament and / or multifilament. 2. The knotless net for cultivating seaweed according to claim 1.