JPH02289147A - Nylon multifilament plain fabrics - Google Patents

Abstract

PURPOSE:To obtain the title woven fabrics having excellent resistance to hydraulic pressure and excellent water repellency without no wale streak by treating yarns, which are formed by specifying the taking-up speed, optical birefringence and elongation at breakage, with finishing oil and weaving the yarns with water-jet looms with no twisting and sizing. CONSTITUTION:The yarn is taken up at a speed of higher than 3,500m/min to give filaments of 0.035 to 0.045 optical birefringence and 40 to 65% elongation at breakage. The filaments are treated with a finishing oil mainly containing wax and mineral oil so that the dynamic friction coefficient between the yarn to metal becomes higher than 0.30 and the static friction coefficient between the yarns, less than 0.25. The resultant filaments are woven with a water-jet loom machine under such conditions as the equation is satisfied where D is denier of the warp; N is the warp density of the gray fabric) to give the subject woven fabric of less than 15cm<3>/cm<2>/sec air permeability.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention uses nylon filament yarn (hereinafter referred to as "nylon 6POY yarn") obtained by high-speed spinning at a take-up speed of 3500+w/min or more as a warp. The individual filaments constituting the yarn are non-uniform and arranged to provide the maximum coverage factor. There are no warping defects and the physical properties are 9wi. In particular, it relates to textiles with excellent water pressure resistance and water repellency. [Prior art] Japanese Patent Application Laid-Open No. 52-99345 and Japanese Patent Application Laid-Open No. 55-8053
As described in Publication No. 5, nylon 6POY yarn has traditionally been converted into nylon 6 multifilament yarn (hereinafter referred to as "nylon 6FDY yarn") obtained by a two-step process of spinning and drawing for specific purposes. It is well known that they have relatively similar properties. In particular, nylon 6POY yarn with a birefringence index of 0.035 to 0.045 has physical properties such as a breaking elongation of 40 to 65% and a hot water shrinkage rate of 12% or less.
Like yarn, it is often used as a weft for textiles. In addition, if we pay attention to recent weaving technology, apart from special fields that handle high value-added products, we find that it is also used in many other fields.
In order to reduce processing costs, weaving is carried out using highly productive fluid jet looms such as water jet looms. In this case, especially when using nylon 6FDY yarn as the warp yarn, taffeta, fill, etc. can be produced at high speed of the loom without twisting or gluing. This makes a significant contribution to cost reduction. Currently, in order to further rationalize textile manufacturing costs, we are currently using a fluid jet loom using nylon 6POY yarn, which has a great advantage in terms of reducing raw yarn manufacturing costs, as the warp yarn, and creating a twist-free fabric. . Attempts have been made to weave without glue. However, using nylon 6 POY yarn as the warp,
It has been found that when weaving tucks using a fluid-jet loom without twisting or gluing, the resulting fabric has serious drawbacks in terms of physical properties and quality. it is,
The warp spacing is uneven due to tension unevenness in the longitudinal direction of the warp due to the fact that the cutting elongation is higher than that of the nylon 6FDY yarn. In other words, when weaving under high speed rotation such as in a water jet loom, the tension applied to the warp threads is: Normally, an average tension of 0.3 g per denier, equivalent to 21 g for 70 denier, is applied, and the maximum tension is applied at a position where the generation part cannot be measured (the heddle part where the warp threads move the most). Although it is not clear because of this, it is presumed that a tension of at least 2 to 3 times the average tension is applied between the VAs. Figure 3 shows nylon 6
These are the tensile strength and elongation curves of POY yarn A and nylon 6FDY yarn B. Looking at the initial tensile strength and elongation curve shown in Figure 3. It can be seen that nylon 6 POY yarn A has 2 to 3 times higher elongation than nylon 6FDY yarn B even at low tension. Therefore, when weaving, nylon 6POY
The yarn is more susceptible to distortion than nylon 6FDY yarn,
In case of poor warp shedding or slight tension unevenness, the degree of tension applied to the warp, or in other words, the apparent diameter of the upper warp differs, and as a result, the spacing between the warp threads, which are made up of several thousand pieces of wood, is dense in some areas and in other areas it is coarse. It is thought that this will result in a heterogeneous arrangement with a mixture of. When such a yarn arrangement is adopted, in terms of physical properties, water pressure resistance decreases due to high air permeability, and in terms of quality, warp-like defects appear. This is particularly a problem in fields such as windbreakers where water resistance is important.

[Problem to be solved by the invention]

The above-mentioned disadvantages of woven fabrics in terms of physical properties and quality are the essential disadvantages that occur when weaving using a water jet loom with nylon 6 POY threads as warp threads with virtually no twist or glue. Therefore, the problem cannot be solved by ordinary means such as changing the physical properties of the warp yarns or changing the number of filaments. The problem to be solved by the present invention is particularly noticeable in plain weave fabrics with a relatively low warp density, and is particularly noticeable in fabrics with a plain weave structure that has a relatively high warp density, such as diagonal weave and satin weave. There are few defects. Therefore, the present invention attempts to solve the problems with flat mm-thick objects. Therefore, when we examined the range of warp fineness (denier number) and gray warp density range of nylon multifilament fabrics that cause the above-mentioned defects, we found that the warp fineness (denier number) caused the problem. The range is 50-70
Denier and also. The problem range for gray warp density is 110 to 150 threads/inch for 50 denier.
At ~120 yarns/inch, the difference between dense and coarse warp spacing, so-called warp streak defects, suddenly becomes noticeable, and at 140 to 150 yarns/inch, it rapidly decreases. 95~ for 70 denier
At 130 lines/inch, warp streak defects start to become noticeable at around 95 lines/inch, become most noticeable at 110 to 120 lines/inch, and have a relatively high density of 120 to 130 lines/inch. It was found that the air permeability of the gray fabric decreased rapidly, and the same trend was observed for the air permeability of the gray fabric. In order to generalize these matters, if the warp fineness (denier number) is expressed as D and the gray warp density is N (threads/inches), then equation (1) is obtained. 800≦Nf10-:li, 1050. ------
−−−−−・−(1) In other words, (1) 2 is the square root of warp fineness (denier number) V'D & gray warp density N
It is said that when weaving a fabric in a water jet loom where the value of the product N zo is within the range determined by the above formula, a fabric with warp streak defects and high air permeability will be produced. It means that. The air permeability of the fabric in this range is 5 to 15 cJ/crA/ when Naicon 6FDY yarn is used for the warp.
seconds, while for nylon 6 POY yarn it is 15-35 cal/c++I/second. The purpose of the present invention is to weave a fabric in a water jet loom using nylon 6FDY yarn as the warp and having a warp with a fineness (denier number) falling within the range of formula (1) and a gray warp density. The aim is to eliminate the warp-like defects that have traditionally occurred in textiles.

[Means to solve the problem]

In the present invention, the birefringence obtained when the spinning take-off speed is 3500 m/min or more is 0.035 to 0.045. Cutting elongation is 40
A thread made of ~65% nylon multifilament is coated with an oil agent mainly composed of wax and mineral oil, so that the coefficient of dynamic friction between the thread and metal in dry and wet conditions is 0.30.
As described above, the yarn treated so that the coefficient of static friction between the yarns is 0.25 or less is used without twisting or gluing, and the fineness of the warp (
By weaving a plain woven fabric in which the multiplicative product Nv'D of the square root f of (denier) D and the warp density N (threads/inches) of the gray fabric is within the range of formula 11 below, in a water jet loom, the gray fabric The gist is a nylon multifilament plain woven fabric characterized by an air permeability of 15 cJ/cta 7 seconds or less.800≦NV'10-:i;1050...
(1) Hereinafter, the steel/iron multifilament plain woven fabric according to the present invention (hereinafter referred to as "plain woven fabric of the present invention") will be explained in detail. In the plain woven fabric of the present invention, the coefficient of dynamic friction between the nylon 6 POY yarn and the metal in dry and wet conditions must be 0.30 or more. In other words, the dynamic friction coefficient between the thread and the metal, in other words, the dry friction coefficient between the warp and heald during weaving, and the wet friction coefficient between the warp and reed are 0.30.
By doing more than that. By increasing the frictional force of the warp threads against the heddles and reeds and actively and probabilistically disarranging the filaments into a uniform arrangement, a good woven fabric without warp defects can be obtained as a whole, and furthermore, The physical properties of the fabric, especially the air permeability, are reduced. When this dynamic friction coefficient is less than 0.30,
There is little opportunity for the filament arrangement to be disturbed, and the warp spacing is a mixture of dense and coarse sections, resulting in warp streak defects. The purpose of the present invention cannot be achieved. In addition, the static friction coefficient between the yarns under dry and wet conditions is set to 0.25 or less to prevent fuzz during weaving. By reducing the amount, weavability is improved. If the coefficient of static friction in the present invention exceeds 0.25, the filaments of the yarn will open. There is a lot of fuzz and the weavability is significantly reduced. In the plain woven fabric of the present invention, the coefficient of dynamic friction between the yarns and the metal under dry and wet conditions is 0.30 or more, and the static Il between the yarns is 0.30 or more. A friction coefficient of 0.25 or less can be easily achieved by adding a sizing agent such as polyethylene wax to a smoothing agent mainly composed of mineral oil as an after-oiling agent during spinning or warping. . In addition, the method for measuring the frictional properties of the plain woven fabric of the present invention will be explained with reference to the drawings. FIG. 1 is an explanatory diagram of the method for measuring the coefficient of dynamic friction in the present invention. Yarn 1 from speed controller 7 to 300ra
Pulled out at a speed of 7 minutes, chrome-plated diameter 10
Tension measuring devices 5 and 6 are installed on the metal rod 2 so that the angle θ is 1200. One tension measuring device 5 is 25g
The tension is adjusted by the tension applying device 3 so that The dynamic friction coefficient μd is determined by the following formula. FIG. 2 is an explanatory diagram of the method for measuring the coefficient of static friction in the present invention. One side 10 of the inclined plate 9 inclined around the fixed shaft 8
A load V/+g of 1/30 of the yarn fineness (denier) is suspended from the other end of 11, and a 10 cm loop of yarn 4 is placed in the center between 10 and 11. A load W2g of yarn fineness (denier) of 1750 is hung. The initial inclination angle θ2 at this time is read. Next, the inclined plate 9 is rotated by a motor (not shown) by 1° around the fixed shaft 8.
/sec. The angle θ3 (not shown) at which the yarn 4'' on the yarn 4 starts moving is read from the angle plate 12. The static friction coefficient μs is determined by the following formula: ps = jan(θ3-θ2) The term "wet" means that the yarn was immersed in water at 20"C for 1 minute. In addition, in the plain woven fabric of the present invention, the birefringence of the nylon 6 POY yarn obtained at a take-up speed of 3500 m/min or more is 0.035 to 0.045. Cutting elongation 40-60%
The reason for this is as follows. If the birefringence index is less than 0.035 or the cutting elongation exceeds 60%, problems will arise in the formation of the package itself when producing the nylon 6POY yarn, and furthermore, the resulting nylon 6POY yarn The quality of the thread varies greatly due to changes in the thread over time, making it difficult to use as a warp. Moreover, this birefringence is 0.045. Yarns with a breaking elongation of 40% or less can be obtained by either the take-up speed or the spindle type.
＜If you try to obtain it by force, you will ignore economic efficiency and go against the rationalization of yarn manufacturing costs. The yarns used in the plain woven fabric of the present invention may basically be those obtained by a one-step method.
Regardless of whether stretching is performed or not. Further, the cross-sectional shape of the filament is not limited to the usual circular shape, but may also have a modified cross-section or a hollow cross-section. The plain woven fabric of the present invention thus obtained is subjected to additional processing such as acrylic coating in order to obtain a woven fabric with excellent physical properties, particularly water pressure resistance and TA water resistance. In order to obtain good water pressure resistance and i88 in the final product, it is necessary to maintain the air permeability in the gray fabric below 15 cd/cd 7 seconds. However, this can be easily achieved by appropriately setting the ratio and adhesion of wax and mineral oil, which are the main components of the oil agent.

[Effect]

In the manufacturing method of the present invention, when weaving using a water jet loom using nylon 6POY yarn as a warp without twist and no glue, if the filament arrangement of the warp is disturbed and an uneven arrangement occurs, the 5 warp Focusing on the fact that the spacing between the warp threads and the warp threads becomes closer and no warp-like defects occur, we actively disturb the arrangement of the constituent filaments of the warp threads by increasing the coefficient of friction between them and the heddles and reeds. The weavability is improved by lowering the coefficient of friction between the strips. Due to the non-uniform arrangement of the filaments formed in this way, the spacing between the warp threads, which are made up of thousands of warp threads, is made dense. When nylon 6POY yarn is used for the warp, it is designed to eliminate the characteristic warp streak defects that have traditionally occurred, and the air permeability of the gray fabric has been increased to 15cnl/cr.
A: By keeping it for 7 seconds or less, the physical properties of the fabric, especially water pressure resistance and 1Q water resistance, are improved.

【Example】

The birefringence obtained at a spinning take-off speed of 4500 m/min is 0.
．． 042. The warp is made of 70 denier/12 filament circular cross-section nylon 6POY yarn with a cutting elongation of 58% and a number of entanglements of 15 strands/la, and is oiled with mineral oil, anionic activator, wax, etc. as the main ingredients during warping. Oiling was carried out with various blends of the following, to prepare yarns of Examples having friction coefficients within the numerically limited range of the present invention and Comparative Examples having friction coefficients outside the range. As the weft, a 70 denier/24 filament circular cross-section nylon 6 POY yarn having the same take-up speed, birefringence, cutting elongation, etc. as the warp was used. For gray fabric, the longitudinal density (N) is 118 lines/inch and the latitudinal density is 87 lines/inch (therefore, N V/T = 118X r - =
987). A plain weave was woven using a Tsudakoma ZW-303 type water jet loom with a rotation speed of 750 times/m. The results are listed in Table 1. The evaluation method in Table 1 is as follows. (11 Weaving performance: ◎ when the weaving operability is extremely good, ○ when it is good)
, If there is a lot of warp fuzz and operation is difficult, △. Cases in which weaving operability was extremely poor were marked with an x. (2) Fabric quality: The fabric after weaving was evaluated with the naked eye. If there were no warp streak defects at all, it was rated ◎, and if it was similarly good, it was rated ○. △ if there are some warp streak defects but within the passing range in inspection.
Cases where there were too many warp-stripe defects and the fabric inspection failed were marked with an x. (3) Air permeability and water pressure air permeability were measured in accordance with JIS (L-1096). The water pressure resistance was measured using the JIS (L-1092) water pressure resistance measuring method (low water pressure method) on fabrics that were dyed and then acrylic coated. As is clear from Table 1, the example
・Number 4 is that the dynamic friction coefficient of the warp against metal under dry and wet conditions, which is numerically limited in the present invention, is 0.30 or more. In addition, the coefficient of static friction between yarns satisfies all conditions of 0.25 or less, which improves (1) weavability, (2) fabric quality, (
3) Good results were obtained regarding air permeability and water pressure resistance. However, the first comparative example, test N11l-!, is outside the scope of the numerical limitations of the present invention. lh2・ll&
Regarding No. 15 and Magnetic No. 6, the evaluation result was that it was poor in either (1) weavability or (2) fabric quality, or both.

【Effect of the invention】

According to the invention, nylon 6 PO used as warp threads
By imparting appropriate frictional properties to the Y yarn, it is possible to arrange the individual filaments that make up the warp unevenly and to achieve the maximum cover factor, which can solve problems in the past in textiles. This eliminates the quality defects, that is, the warp streak defects, and provides a fabric with excellent fabric properties, especially water pressure resistance and tn water resistance.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a method for measuring the coefficient of dynamic friction of a plain woven fabric of the present invention, FIG. 2 is an explanatory diagram of a method of measuring the coefficient of static friction of a plain woven fabric of the present invention, and FIG. 3 is an explanatory diagram of a method of measuring the coefficient of static friction of a plain woven fabric of the present invention. It is a physical property diagram of yarn. In addition, 1, 4, and 4 are threads, 2 is a metal rod, 3 is a tension applying device, 5 and 6 are tension measuring devices, 7 is a speed controller,
8 is a fixed shaft, 9 is an inclined plate, 12 is an angle plate, A is a curve of nylon 5POY yarn, and B is a curve of nylon 6FDY yarn.

Claims (1)

[Claims] (1) Birefringence obtained at a spinning take-off speed of 3500 m/min or higher is 0.035 to 0.045, and the cutting elongation is 40 to 6.
A thread made of 5% nylon multifilament is coated with an oil agent mainly composed of wax and mineral oil, so that the coefficient of dynamic friction between the thread and metal in dry and wet conditions is 0.30.
As described above, the yarn treated so that the coefficient of static friction between the yarns is 0.25 or less is used without twisting or gluing, and the fineness of the warp (
By weaving a plain woven fabric in which the multiplicative product N√D of the square root √D of (denier) D and the warp density N (lines/inches) of the gray fabric is within the range of formula (1) below, in a water jet loom, A nylon multifilament plain woven fabric characterized by having a gray air permeability of 15 cm^2/cm^2/sec or less. 800≦N√D≦1050・・・・・・・・・・・・・
...(1)