JPH043930B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method of manufacturing a net using raw yarn for making a solution-colored net of excellent quality. [Prior art] Knotless fishing nets are generally used in purse seine fishing methods and set net fishing methods, and the lot units of the nets are large.
Moreover, since the number of threads that make up it is large and thick,
Dyeing by post-dying is not only economical but also difficult in terms of work; in this field, there are many dark blacks and dark browns (also called katsuchi), and the temperature conditions during dyeing are high because of the deep dyeing. It takes a long time, and
Since the dyeing waste liquid remains as a thick residual liquid, there are problems in that a large amount of cost is required for processing this waste liquid. The use of spun-dyed yarns has been proposed as a way to improve this current situation, and spun-dyed polyester yarns, spun-dyed nylon yarns, spun-dyed polyethylene yarns, spun-dyed polyvinylidene chloride yarns, etc. have been put on the market. ,
They are developed for different purposes. The quality of polyester yarn for fishing nets has improved dramatically in recent years, and it is not just a product that contains pigments in the polymer, but also has a transparent feel, and is not only dyed on the surface with dye. ,
The dye is evenly distributed inside, so sunlight,
Fishing net threads have been provided that are highly resistant to friction and seawater, and are highly durable. Dried nets are commercialized by using raw yarn with good fastness, and are processed with resin and heat set after knitting, but unlike dyeing, there is no moist heat treatment process, so the yarn oil is removed. Because the coefficient of friction between yarn layers is smaller than that of dyed netting, it feels soft when handled, and it has been pointed out that it is softer than the conventional feeling, and some improvements have been requested.
For this reason, improvements have been made, such as increasing the denier of the single yarns constituting the raw yarn and increasing the denier of the single yarns to an extent that does not inhibit knitting, but these have not always been satisfactory. [Problems to be Solved by the Invention] The present invention solves the various drawbacks of the prior art,
To provide a method for manufacturing a net using raw yarn for polyester spun-dyed net, which improves the net's texture, so-called net stiffness, and improves the overall performance of the net, such as further improving friction properties. It is something. [Means for Solving the Problems] The object of the present invention is achieved by the following configuration. (1) After stretching to 4.6 times or more, the maximum value of heat shrinkage stress obtained by relaxing treatment in the range of 2 to 5% is in the range of 180 to 220 °C,
It is made of polyester fibers whose heat shrinkage stress is 0.1 to 1.0 g/d, and the fiber has a maximum heat shrinkage stress value (A), and heat shrinkage at a temperature between 20°C and 100°C lower than the temperature showing the maximum value. After producing yarn for spun-dyed netting with a ratio (A/B) to stress value (B) of more than 1.10, the yarn is twisted and made into a net, and then the net is prepared in the range of 100 to 180°C. 1. A method for manufacturing a spun-dyed net, which comprises heating and relaxing the net, and then performing finishing heat treatment under tension at a temperature 20° C. or more higher than the preliminary heat treatment temperature. The polyester spun-dyed yarn used in the present invention has a maximum heat shrinkage stress in the range of 180 to 220°C,
It is made of polyester fibers whose heat shrinkage stress is 0.1 to 1.0 g/d, and from 20°C to 100
Ratio (A/
B) is larger than 1.10, but by using such a yarn, it is possible to increase the internal shrinkage rate between yarn layers of the net yarn, and the thermal shrinkage stress at the final finishing heat treatment temperature of the net, that is, the net shrinkage due to heat. Because we can maximize the shrinking power of the earth,
In addition to being able to greatly improve final set efficiency,
It is possible to obtain a net that is firm and has an excellent texture, and has good durability, drainage properties, and net handling properties. After the raw yarn is twisted and made into a net by a conventional method, the net after making the net is subjected to a specific finishing treatment in order to further increase the setting efficiency and produce a high-quality and durable net. That is, before the final finishing treatment (second stage), the temperature is 100 to 180℃ lower than the finishing temperature.
A preliminary heat treatment (first stage) is performed to relax the fabric, thereby causing appropriate internal shrinkage between the yarns. If the preliminary heat treatment temperature is too close to the final finish heat treatment temperature, the finish setting efficiency will be reduced, so a temperature difference of at least 20° C. is required. On the other hand, if the preliminary heat treatment temperature is set too low, the effect of the preliminary heat treatment will be lost, so the temperature difference between the two needs to be set within a range of 100°C or less. Therefore, in the present invention, this preliminary heat treatment is
The temperature is 100 to 180°C. FIG. 1 is a comparative plot of the heat shrinkage stress of the polyester yarn between a conventional type yarn and the yarn used in the present invention. For conventional type yarn, the maximum shrinkage stress value is 241℃, and the absolute value of shrinkage stress is as low as 0.09g/d. Although the ratio (A)/(B) is 2.7, even if this is used as a net yarn to produce a product, it is not possible to obtain the net stiffness that is the objective of the present invention. In the past, resin processing and hot water washing treatments have been used to improve this problem, but the current situation is that nothing satisfactory has yet been obtained. On the other hand, the yarn according to the present invention is obtained by stretching at a high magnification of 4.6 times or more and then relaxing in a range of 2 to 5%, and the temperature at which the maximum shrinkage stress value is reached is 204°C. Although the ratio of (A)/(B) at 150℃ preheat treatment is as low as 1.76, the maximum shrinkage stress value is as high as 0.142g/d, so overall,
It is possible to create nets with a firm and appropriate texture. The final finishing heat treatment temperature in the present invention is as follows:
Since the preliminary heat treatment temperature is 100 to 180°C, it is preferably in the range of 180 to 220°C. or,
Dry heat treatment is suitable for preliminary heat treatment, but
Treatment with high-temperature steam or high-temperature water in this temperature range may also be used. Just choose the most economical method that suits your process. In the present invention, heat shrinkage stress refers to the shrinkage force that acts when raw yarn is exposed to dry heat, measured as a relationship diagram between temperature and stress, using a "thermal stress measuring machine model KE-2" manufactured by Kanebo Engineering Co., Ltd. ”, make a 10cm loop of the raw yarn, hook the upper part to the hook attached to the U-gauge, and set the initial load to 1/30g/
d, put it on the lower hook, twisted the yarn at a specified heating temperature (120 seconds from room temperature to 300°C), and recorded the stress and temperature with an X-Y recorder. [Examples] The present invention will be explained in detail below using Examples. Example 1 Chips of polyethylene terephthalate containing 0.8% of brown pigment (25°C, intrinsic viscosity [η] 1.0 determined from O-chlorophenol solution) were heated to a melting temperature of 300°C using a normal spinning machine for thick materials. , number of cap holes
While spinning through 96 spindles and adding an oil agent,
It was wound at 5000m/min. The obtained undrawn yarn is first drawn in two stages at a draw ratio of 4.7 between the first hot roller 7 and the third hot roller 9 using the drawing device shown in FIG. 5% between
It was subjected to relaxation treatment and wound into winder 11. Thus total denier 1000d, tensile strength 6.1g/
d, elongation 27%, heat shrinkage stress 0.176g/d at 204℃
The yarn was obtained. Two of these threads are twisted together and wound around a woodwind. This twisted yarn is stored in a shuttle commonly called a "tetsuba" attached to the knotless knitting machine, and can be taken out through a tension spring guide. Put this through a knotless knitting machine,
While twisting the yarn, it was crossed with other twisted yarns to knit a net with a mesh size of 50 mm without knots. Next, this net was placed in a hot air drying chamber and subjected to the pretreatment conditions shown in Table 1 for 50 minutes.
When heat treated for a minute, the mesh size was 42mm. This net was further subjected to a vertical draw heat treatment at 210° C. and a stretching heat treatment for about 2 minutes under the finishing set conditions shown in Table 1, and a net with a mesh size of 48 mm could be made. Table 1 shows a comparison of the net stiffness, strength and elongation, frictional strength, etc. of this net, a conventional net (2% tension one-stage heat treatment), and the comparative product below. That is, as a comparison product, Example 1 was prepared under the preheat treatment conditions and final heat treatment conditions shown in Table 1.
A processed net from a knotless knitting machine was prepared. As a result, it can be seen that, compared to the conventional net and the comparative net, the net of the present invention obtained in Example 1 has firmness, good abrasion resistance, and excellent heat resistance. . That is, as is clear from Table 1, the conventional product had a lower level of hardness and abrasion than the product of the present invention, and was not stiff. In addition, all three types of comparative nets exhibited hardness and abrasion resistance at the same level as conventional products. In particular, those in which both the two stages are tensioned are extremely lacking in hardness and are extremely stiff.
The one in which both stages were relaxed had slightly better mesh stiffness than the conventional product, but had very poor abrasion resistance. In addition, products with relaxation and tension that were reversed to those of the present invention had slightly better elasticity than conventional products.

【table】

[Table] Stretching ratio: +=tension, -=relaxation Here, the cantilever method net hardness ratio is JIS.L
-1096-6, 19, a test piece is placed along a horizontal table with a smooth surface with one end sloped at 45 degrees, and one end of the test piece is placed along the slope of the horizontal table. and accurately read the position of the other end of the test piece on the scale. Next, slide the test piece in the direction of the slope, read the length when one end of the test piece reaches the slope, and show the comparative value with the conventional method (finishing treatment at 200℃ x 2 minutes) set as 100. It is. Furthermore, the thread-thread friction test refers to the number of times the threads intersect and rub each other in water using a T-type abrasion tester manufactured by Toray Industries, Inc. until the threads break. In this case, the intersecting angle of the threads is 90° and the hanging load is 2 kg. Example 2 The knotless mesh having a mesh size of 50 mm, which was knitted in Example 1, was heat-treated by the process shown in FIG. A 5-fold dilution of Ota Kaken's "Hard Finishing Resin" liquid is placed in the resin tank 2 attached to the heat treatment machine, and the net 1 is immersed in the tank to be impregnated with the resin, taken out, and then placed in a mangle. 3, aperture rate 100
%, and then heat treated for 5 minutes in a dry heat treatment machine 4 at 150°C. In this case, the feeding net is overfed and set to cause net shrinkage of at least 5% or more. Furthermore, 210 consecutively
The film was stretched in a dry heat treatment machine at a temperature of 2 minutes at a stretching rate of 2 to 5%. As in Example 1, this net also had good net stiffness and was further treated with resin, so that it was possible to obtain a net with improved wear resistance. Example 3 An undrawn yarn was produced in the same manner as in Example 1 using polyethylene terephthalate chips containing 0.8% brown pigment (25°C, intrinsic viscosity 1.0 determined from an o-chlorophenol solution). This undrawn yarn was subjected to two-stage stretching and relaxation treatment in the same manner as in Example 1 under the stretching ratio and relaxation rate conditions shown in Table 2. Table 2 shows the yarn properties of the obtained raw yarn. This yarn is passed through a knotless knitting machine to form a net.
Pretreatment and finishing settings were carried out under the conditions shown in Table 3. The stiffness of the obtained net was evaluated and the results are shown in Table 3. Experiment Nos. 2, 3, and 4, which satisfied the present invention, were superior in stiffness, high quality, and durable compared to conventional products. In addition, it was also extremely good in terms of drainage and netting properties.

【table】

【table】

[Table] Humidity indicates moist heat.
[Effects of the Invention] Since the present invention has the above-mentioned configuration, it is possible to significantly improve the setting efficiency of the net fabric, and it has elasticity, excellent texture, and has good durability, drainage properties, and net handling properties. A dyed net can be obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating the relationship between the heat shrinkage stress at each temperature of the raw yarn, and FIG. 2 is an explanatory diagram illustrating the process used in the present invention. FIG. 3 is a schematic diagram of a drawing device for producing the spun-dyed yarn of the present invention. In the figure, 1: net, 2: resin tank, 3: mangle,
4: First dry heat treatment machine, 5: Finish heat treatment machine,
6: Supply roller, 7, 8, 9: Hot roller, 1
0: Winding roller, 11: Winder.

Claims (1)

[Claims] 1 After stretching to 4.6 times or more, the maximum value of the heat shrinkage stress is in the range of 180 to 220°C, obtained by relaxing treatment in the range of 2 to 5%, and the heat shrinkage stress is 0.1 to 1.0 g. /d, and the maximum heat shrinkage stress value (A) of the fiber
The ratio (A/B) of the thermal contraction stress value (B) at a temperature between 20°C and 100°C lower than the temperature showing the maximum value.
After producing yarn for spun-dyed nets with a diameter of greater than 1.10, the yarn is twisted and made into a net, the net is subjected to preheat treatment in the range of 100 to 180°C to relax it, and then the preheat treatment is performed. A method for producing a spun-dyed net, characterized by subjecting it to finishing heat treatment under tension at a temperature 20°C or more higher than the actual temperature.