JPH0250227B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a nylon 6-fiber yarn (hereinafter referred to as "nylon 6POY yarn") obtained by a one-step high-speed spinning method.
Nylon 6 which is woven using a fluid jet loom (hereinafter referred to as "fluid jet loom") such as a water jet loom or an air jet loom (hereinafter referred to as "fluid jet loom") with a take-up speed of 3500 m/min or more as warp threads. The present invention relates to a method for manufacturing textiles. (Prior technology) In recent years, in the weaving field, with the exception of fields that handle special textiles such as high-value-added products, weaving costs have increased with the advancement of weaving technology centered on highly productive fluid jet looms, etc. In particular, in weaving technologies such as taffeta and twill, which use nylon 6 yarn (hereinafter referred to as ``nylon 6FDY''), which is produced by a two-step process of spinning and drawing (hereinafter referred to as "nylon 6FDY"), as the warp, Significant progress has been made, such as by eliminating glue and increasing the speed of loom rotation. Here, for the nylon 6POY yarn obtained at a take-up speed of 3,500 m/min or more, we are not only satisfied with the rationalization effect in the yarn manufacturing aspect of reducing the yarn cost, but also using fluid injection with excellent productivity. There has also been a strong demand for streamlining the weaving process using type looms. (Problem to be solved by the invention) However, nylon 6POY with a birefringence of 0.035 to 0.045 obtained at a drawing speed of 3500 m/min or more
The yarn has physical properties such as a cutting elongation of 40% to 65% and a hot water shrinkage rate of 12% or less. As described in Publication No. 80535, it has properties very similar to nylon 6FDY yarn and can be used relatively easily as a weft for textiles, but it can also be used as a warp when weaving with a fluid jet loom. It has been found that when used, it causes serious quality defects in the resulting fabric. In other words, woven fabrics using nylon 6POY yarns as warp threads have warp-like defects that have luster spots in the warp direction, which do not occur in woven fabrics using nylon 6FDY threads as warp threads, commonly known as irritating defects. There are some drawbacks to nylon
It was found that the quality of the fabric was completely different from that of fabrics using 6FDY yarn as the warp, and the product value of the fabric was significantly reduced. As a result of intensive studies, we have come to the conclusion that the main causes of such irritating defects are as follows. In other words, apart from the physical properties of the nylon 6POY yarn, the fundamental problem is that the arrangement of each filament in the axis direction of a single yarn is disordered, which is a normal spun-drawn yarn. Compared to the case of nylon 6FDY yarn, this is extremely small.
In other words, in the case of nylon 6POY yarn,
Because there is little disorder in the arrangement of the individual filaments that make up the warp, which is made up of several thousand warps, a part with a high degree of disorder in the filament arrangement, which occurs with a certain probability, is adjacent to a part with less disorder, resulting in a type of disorder. This results in shiny spots and an irritating defect. In this way, the filaments that make up the nylon 6POY yarn have less disorder in their alignment in the yarn axis direction, and the filaments that make up the nylon 6FDY yarn have more disorder in their alignment than the nylon 6POY yarn. Since the manufacturing process for nylon 6POY yarn is a one-step process rather than a two-step process like nylon 6FDY yarn, the distance that the yarn passes through during the manufacturing stage is shortened, which inevitably leads to Compared to nylon 6FDY yarn, the frequency of contact with guides and rollers is lower, and the winding package is usually in the form of a cheese due to high-speed winding, and the original twist is about 1 to 2 times/m. On the other hand, nylon 6FDY yarn has less contact with guides, rollers, etc. than nylon 6POY yarn. In particular, in the drawing process, the package cage is produced in the form of a pirn, so a ring-type drawing machine is used, so there is contact between the ring and the yarn, and the original twist is also
This is because the filaments that make up the yarn are applied about 10 times/m, so the arrangement of the filaments that make up the yarn is more disordered than in the case of the filaments that make up the nylon 6POY yarn. Furthermore, the filament arrangement of nylon 6POY yarn is less disordered than that of nylon 6FDY yarn because nylon 6POY yarn has higher elongation than nylon 6FDY yarn in terms of its physical properties. Sometimes it's for a reason. When weaving with a fluid jet loom, the warp of nylon 6FDY yarn does not absorb the strain caused by fluctuations in warp tension due to shedding motion due to its low elongation.
If nylon 6POY yarn is used as the warp, it will absorb this strain due to its high elongation, making it less likely that the filament arrangement of the POY yarn will be disturbed. Note that interlace interlacing is an effective means to disturb the arrangement of the filaments that make up the yarn, but nylon 6POY yarn obtained at a take-up speed of 3,500 m/min or more is used as the warp for weaving on a fluid jet loom. In order to eliminate the irritating defects that occur when
As mentioned above, preferably the number of interlaces is 40 or more, but since the current interlace technology can industrially only achieve a number of at most 30 or more interlaces, it is possible to eliminate irritable defects by interlace interlace processing. It is currently extremely difficult to resolve this issue. In addition, as knowledge related to the irritation-like defects that occur due to the magnitude of disorder in the arrangement of the filaments that make up the yarn, for example, Japanese Patent Publication No. 57-25658 and Japanese Patent Publication No. 60-25531, etc. Although some have been described, what is described is fundamentally different from the disordered arrangement of filaments according to the present invention. In other words, the special public service in 1977
-25658 and Japanese Patent Publication No. 60-25531, the filament structure is basically a two-stage arrangement or a three-stage arrangement, and depending on the mixing ratio of the number of stages in the arrangement, a kind of irritation-like defect occurs. This is a phenomenon specific to the yarn obtained by the conventional two-step spinning-drawing method, whereas the disorder of the filament arrangement according to the present invention is caused by, for example, a phenomenon in the two-stage arrangement of filaments. This is an irritating defect caused by disordered arrangement of filaments in a three-stage filament arrangement, or disordered arrangement of filaments in a three-stage filament arrangement. This phenomenon can be said to be unique to yarns obtained by a single-step method of high-speed spinning, which is different from yarns given. In view of the above points, the present invention is made of nylon that has a birefringence of 0.035 to 0.045, a cutting elongation of 40% to 60%, and a hot water shrinkage rate of 12% or less, obtained at a drawing speed of 3500 m/min or more. Even when weaving on a fluid jet loom using nylon 6POY yarn, which has less filament disorder than 6FDY yarn, and whose entanglement number is less than 30 threads/m, as warp threads, the surface of the fabric The object of the present invention is to provide a method for producing a nylon 6 fabric that does not produce irritating defects. (Means for solving the problem) That is, the present invention has a birefringence △n of 0.035 to 0.045 and a cutting elongation obtained at a drawing speed of 3500 m/min or more.
Nylon with a hot water shrinkage rate of 40% to 60% and less than 12%
It is characterized by being 6POY, using untwisted and unsealed yarn with less than 30 entanglements/m as warp threads, and weaving by cross-beating at a crank angle of 10° to 35° using a fluid jet loom. This is a method for producing a nylon 6 fabric. The method for manufacturing a nylon 6 fabric according to the present invention (hereinafter referred to as "the manufacturing method of the present invention") will be described in detail below. That is, in the manufacturing method of the present invention, the birefringence Δn is
0.035 to 0.045, a cutting elongation of 40% to 60%, a hot water shrinkage rate of 12% or less and a take-up speed of 3500 m/min or more. This is a method of manufacturing nylon 6 fabric using a fluid jet loom using untwisted and unsealed warp yarns with a number of less than 30 threads/m, but the reed beating is performed at a crank angle of 10° to 35°. It is characterized by being carried out by cross-beating. In the above cases, the yarn take-up speed is set to 3500.
Nylon 6POY is limited to m/min or more.
This is to obtain yarn and to enhance the effect of the manufacturing method of the present invention. Furthermore, the reason why the birefringence index is limited to 0.035 to 0.045 is that if it is less than 0.035, the elongation will be too high, and even if the manufacturing method of the present invention is carried out, the occurrence of warp-like defects on the fabric surface will be prevented. If the elongation at break exceeds 0.045, the heat shrinkage rate becomes too large and the dimensional stability deteriorates.
% and the hot water shrinkage rate exceeds 12%, the same applies, so the cutting elongation is limited to 60% or less and the hot water shrinkage rate is limited to 12% or less.
In addition, the cutting elongation is less than 40% and the number of entanglements is less than 30 pieces/m.
This is because it has been found that, in the case of 30 pieces/m or more, there is no risk of causing warp-like defects as far as the cutting elongation and the number of entanglements are concerned. Note that the number of confounds mentioned above is defined in U.S. Patent No. 2985995.
It was obtained by measuring according to the measurement method described in the specification of the publication, that is, the sample length was 1 m.
Apply a load of "thread denier x 0.2 g" to the bottom end of the bundle, insert a hook with "single thread denier x 1 g" into the center of the yarn bundle at the top end of the sample, and spin the yarn at a speed of 1 to 2 cm per second.
Drop the hook gently at a speed of
This is the value calculated by 100/L x 1/2. In addition, cross beating in the above case refers to a reed beating method in which the upper and lower warp yarns in the opening are closed and crossed after weft insertion during weaving, and the weft yarns are beaten with a reed after the crossing. After inserting the weft,
The reed beating method in which the weft yarns are beaten with a reed before the upper and lower warp yarns are closed during shedding is called open beating. Cross-beating of 10° to 35° means that the upper and lower warps close after weft insertion, then open while reversing the vertical positions of the warp, and when the reed is opened for the first time at a crank angle of 10° to 35°, the reed is at its maximum. This refers to a method of beating the reed in a forward motion. For example, when the reed reaches its maximum crank angle of 10 degrees after opening, it is called 10 degrees cross-beating. . Furthermore, in the manufacturing method of the present invention, the reed beating method is limited to cross-beating because, in the manufacturing method of the present invention, each of the warp yarns constituting the warp yarns is This is intended to cause disorder in the arrangement within the filament. In open beating, the sliding friction force is small and it is impossible to obtain the required disorder in the filament arrangement, whereas in cross beating, the sliding friction force is small and it is impossible to obtain the required disorder in the arrangement of filaments.In contrast, in cross beating, the friction between the inserted weft and warp yarns is generated over a very short time. This is because the mutual effect of this effect and the sliding friction effect between the upper and lower warp yarns that inevitably arises accompanying this effect can disturb the arrangement of the individual filaments constituting the warp yarns. The reason why this cross-beating is limited to between 10° and 35° is because if the cross-beating is less than 10°, the above-mentioned sliding friction effect will be insufficient and the required alignment of each filament will be disturbed. In addition, if the crossbeating exceeds 35°, it will have a significant negative impact on weaving performance, such as poor weft insertion and increased shrinkage of the gray fabric width, causing temples to come off. Because it will be. (Function) In the manufacturing method of the present invention, focusing on the fact that there is a large relationship between the opening crank angle during reed beating and the disorder of the arrangement of each filament in the yarn axis direction, When weaving using a fluid jet loom using 6POY yarn as the warp, the warp is 10° to 35° in order to prevent the occurrence of irritating defects caused by the disordered arrangement of the filaments that make up the warp, which occurs on the surface of the fabric. Cross-beating is carried out within the range of up to 200°C, and at this time, the reed blades give each filament just the right amount of sliding action, and the filaments of each warp thread are given the necessary disordered arrangement to prevent the occurrence of irritable defects. It is intended to cause this to occur. (Example) The warp was spun at a spinning speed of 4000 m/min, with a birefringence index of 0.040, a cutting elongation of 58%, and a hot water shrinkage rate of 9.2.
% of nylon 6POY70D/12F yarn,
The number of entanglements is 15 pieces/m, 25 pieces/m, and 35 pieces/m.
Using a seed, and using the same nylon 6POY70D/24F yarn as the weft, the gray warp density was 107.
The taffeta was woven using a water jet loom model ZW-200 manufactured by Tsudakoma Co., Ltd., with a weft density of 82 threads/inch and a rotation speed of 650 times/minute. At this time, both the production method of the present invention and a comparative example in which the production method of the present invention was not adopted were carried out, and the results shown in Table 1 were obtained. The table also shows the amount of cost required for interlacing the threads and the technical difficulty thereof.

[Table] As is clear from Table 1, there is a strong relationship between the opening crank angle during reed beating and the occurrence of irritable defects, and this is different in the case of No. 5, where the number of entanglements is 35 pieces/m. Cases No. 1 to No. 4 according to the manufacturing method of the present invention where the number of entanglements is less than 30 pieces/m, and No. 4 of the comparative example.
7. Looking at this with respect to the case of No. 8, it is found that with the 10° to 35° cross beating of No. 1 to No. 4, there is no occurrence of irritating defects, but even if there are, they are small enough to be of practical use. While it is not a problem, no.
7. In the case of No. 8 with 5° cross-beating, the occurrence of irritating defects is increasing. Incidentally, in the open beating of Comparative Example No. 6, the most irritating defects occurred among the Examples in Table 1. Also No.2
As shown in the figure, when the opening crank angle is 35°,
Its weavability has become common. But this is
This means that the weavability is lower than in the cases of No. 1, No. 3, and No. 4. That is, it can be seen that 35° is the upper limit angle that does not cause poor weavability. Also, when comparing No. 4, No. 5, and No. 8, No. 5
When the number of entanglements is 35/m, no irritating defects occur even when cross-beating at an angle of about 5°, which is not considered to be the implementation of the manufacturing method of the present invention, but when the number of entanglements is less than 30/m, such as 25/ In No. m, the cross-beating angle is 20 degrees, which is the manufacturing method of the present invention. No. 4 has no irritating defects, but the cross-beating angle of No. It can be seen that a certain number 8 has many irritating defects. Furthermore, Fig. 1 shows schematic diagrams for each case of No. 4, No. 6, and No. 8 to show the disorder in the arrangement of filaments in the warp after weaving in the yarn axis direction. Regarding the manufacturing method of the present invention
The disorder in the filament arrangement in figure a in case of No. 4 is the largest, followed by the disorder in figure b in case of comparative example No. 8, which is not related to the manufacturing method of the present invention. It can be seen that the disturbance in diagram c for No. 6 is the minimum. (Effects of the Invention) The manufacturing method of the present invention provides a method for weaving nylon 6POY yarn obtained at a take-up speed of 3500 m/min or higher using a fluid jet loom as a non-twisted and non-sizing warp. By setting the opening crank angle to a cross-beating angle of 10° to 35°, it is possible to completely prevent the occurrence of irritating defects that occur on the surface of the fabric. Using high-speed draw-spun nylon 6POY yarn for the warp, which was considered extremely difficult, it enables the production of high-quality textiles at high speeds and high operating rates, improving productivity and quality. This is a truly great contribution.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of filaments in the warp after weaving, where a shows the case of the present invention and b and c show the case of a comparative example.

Claims (1)

[Claims] 1 Birefringence △n obtained at a drawing speed of 3500 m/min or more is 0.035 to 0.045, and the cutting elongation is 40% to 60%,
Cross-beating at a crank angle of 10° to 35° using a fluid-jet loom using untwisted and glueless yarns made of nylon 6 with a hot water shrinkage rate of 12% or less and less than 30 entanglements/m as warp threads. A method for producing a nylon 6 fabric, comprising the steps of weaving.