JP3985190B2 - Polyamide multifilament fabric and method for producing the same - Google Patents

Polyamide multifilament fabric and method for producing the same Download PDF

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JP3985190B2
JP3985190B2 JP2002134519A JP2002134519A JP3985190B2 JP 3985190 B2 JP3985190 B2 JP 3985190B2 JP 2002134519 A JP2002134519 A JP 2002134519A JP 2002134519 A JP2002134519 A JP 2002134519A JP 3985190 B2 JP3985190 B2 JP 3985190B2
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fabric
strength
tear strength
elongation
polyamide multifilament
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JP2003328250A (en
Inventor
裕行 宮野
美弘 松井
範樹 福西
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東洋紡績株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fabric for clothing and materials having a thin and soft texture and excellent tear strength, and more particularly to a polyamide multifilament woven fabric suitably used for film processing such as laminating and a method for producing the same.
[0002]
[Prior art]
As represented by the recent outdoor boom, consumers are increasingly leisure-oriented every year, and as a result, clothing uses including sports fields such as ski / snowboard wear and outdoor wear, materials for bags, sleeping bags, tents, paragliders, parachutes, etc. The demand for woven fabrics is increasing. By the way, high strength is required for textiles for clothing such as ski / snowboard wear, outdoor wear and other sports fields, bags, sleeping bags, tents, paragliders, parachutes, etc., especially tear strength and wear. Powerful improvement is required. In particular, when film processing such as laminating is performed, it is difficult for the yarn to slip, and thus the tear strength tends to decrease, and an improvement in the tear strength of the base fabric is increasingly desired.
[0003]
As a means for increasing the strength of the polyamide filament in order to obtain a fiber product that requires tear strength, Japanese Patent Application Laid-Open No. 11-247022 discloses a method for increasing the draw ratio and obtaining a high-strength polyamide filament. . However, such yarn has a high strength when stretched by 10% and, conversely, has a low elongation and the texture of the fabric becomes hard. Further, when the elongation is low, the number of yarns that are torn during the process of tearing the fabric is reduced, and the stress per yarn tends to concentrate. The phenomenon is one of tear strength measurement methods, and can be confirmed from the waveform of the chart of A-1 method (single tongue) described in JIS-L-1096. The absolute value of strength is small, and Appears with large fluctuations.
[0004]
In addition, if a yarn having a thick fineness is used to increase the tearing strength of the fabric, the fabric becomes thick and the texture becomes hard, making it unsuitable for applications that require compact storage such as tents, paragliders, and parachutes. Accordingly, there remains a need to develop a thin fabric base fabric that is composed of thin fine yarns, has high tear strength, is compact, and is soft.
[0005]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems of the prior art and provides a woven fabric having a compact and soft thin fabric base fabric and having a high tear strength, and is particularly suitable for film processing such as laminating. An object of the present invention is to provide a woven fabric and a method for producing the same.
[0006]
[Means for Solving the Problems]
As a result of intensive studies on this problem, the present invention has solved the above problem by the following means. That is, the present invention
1. Nylon 6 multifilament with a fineness of 60 dtex or less, 10% elongation strength of 2.0 to 3.0 cN / dtex and breaking elongation of 35 to 50% is woven into a ripstop structure, JIS-L- In the tear strength chart drawn by the single tongue method, the tear strength (L) in the warp cutting direction and the weft cutting direction (L) is 1.5 kgf or more according to the single tongue method described in 1096, and the tear strength (L) A polyamide multifilament woven fabric characterized in that the relationship of local minimum points (S) is L−S / L ≦ 0.5.
2. The polyamide multifilament woven fabric according to the first aspect, which is a polyamide multifilament woven fabric having a woven fabric thickness of 0.15 mm or less and a fabric basis weight of 100 g / m 2 or less.
3. 3. The polyamide multifilament woven fabric according to the first or second aspect, wherein the woven fabric organization is a ripstop organization.
4). Fineness of 60 dtex or less, at 10% elongation of the strength 3.0 cN / dtex 2.0, the elongation at break 35% to 50% of nylon 6 multifilament performs gluing is untwisted, then in re Ppusutoppu Organizational A method for producing a polyamide multifilament woven fabric characterized in that both the warp cutting by the single tongue method described in JIS-L-1096 and the tearing strength (L) in the weft cutting direction are 1.5 kgf or more .
[0007]
The present invention will be described in detail below.
The warp constituting the woven fabric of the present invention is a polyamide multifilament having a fineness of 60 dtex or less, a 10% elongation strength of 2.0 to 3.0 cN / dtex, and a breaking elongation of 35 to 50%. . Polyamide multifilament is a fiber with high strength, high toughness, abrasion resistance, and dimensional stability, and is used for industrial materials such as belts, hoses, tire cords, bags, sleeping bags, tents, paragliders, parachutes, etc. It is suitable for clothing applications including sports fields such as snowboard wear and outdoor wear. However, the present invention targets compact and soft thin fabric applications, specifically for industrial materials such as sleeping bags, tents, paragliders and parachutes, or sports clothing such as ski / snowboard wear and outdoor wear. The fineness is 60 dtex or less, more preferably 50 dtex or less.
[0008]
If the strength of the polyamide multifilament at 10% elongation is less than 2.0 cN / dtex, the strength of the filament is lowered and the tear strength of the fabric is lowered, which is not preferable for the present invention. On the other hand, if the strength at 10% elongation exceeds 3.0 cN / dtex, the fiber modulus becomes high, that is, the fiber becomes bent and hard, and the texture of the resulting woven fabric becomes difficult. When the breaking elongation of the polyamide multifilament is less than 35%, it is not desirable because the stress tends to concentrate on one yarn to be torn when the woven fabric is torn, and the tear strength becomes low. On the other hand, if it exceeds 50%, the breaking strength tends to be low even when various spinning and drawing conditions are adjusted, and this tends to cause a problem that the tearing strength of the woven fabric is lowered. Also. It is not preferable also from the viewpoint of textile dimensional stability.
[0009]
Next, it is desirable that the polyamide multifilament is glued in a non-twisted state, that is, without using a twisted yarn, using a synthetic glue or the like. Costing by gluing can be considered, but weaving and workability of fabrics are greatly improved by gluing using synthetic glue, etc., and high quality fabrics can be stably obtained. Total cost reduction is possible. Synthetic glues are glues such as acrylic glue and polyvinyl alcohol glue, and acrylic glues are polyacrylic acid soda, polyacrylamide, and polyacrylic acid ester. Synthetic glues are excellent in properties such as adhesiveness and high elongation, are inexpensive, and are preferably used for synthetic fibers such as polyester and polyamide fibers. Many kinds of glues are commercially available from glue manufacturers. Therefore, it is important to select and paste in consideration of characteristics such as desizing. In addition, the dry loom such as rapier, fly, and air jet loom and the water jet loom are different in the kind and blending ratio of the paste, so it is necessary to select them appropriately.
[0010]
The fabric of the present invention is for materials such as sleeping bags, tents, paragliders, parachutes, ski / snowboard wear, outdoor wear, and apparel, and is required to have a strong and firm fabric texture. Therefore, the organization of the fabric is preferably a plain organization having the most organization points, or a ripstop organization that combines the plain organization with Ishime and Nanako organization. There may be two or more stones and nanako parts in the ripstop organization. Generally, it is configured within the range of 2 to 5 and may be a double ripstop, and is not limited to the present invention.
[0011]
In the polyamide multifilament fabric of the present invention, when the organization is a ripstop, a standard evaluation method for measuring tear strength and a method used for quality control is a single method described in JIS-L-1096. It is necessary that the tear strength (L) in the warp cutting and weft cutting direction by the tongue method is 1.5 kgf or more. In the case of a ripstop organization, the stone, Nanako part, in other words, the aligning part can prevent the propagation of tearing and increase the tearing strength. However, if the size of the lattice pattern is too large in the ripstop organization, the tear strength is only partially increased, and the textile design is preferably a lattice pattern of 1 to 2 cm, more preferably a lattice pattern of 1 cm or less. It is desirable to do.
[0012]
When the tear strength (L) is less than 1.5 kgf, the tear strength (L) is easily broken when used in sports applications, resulting in inferior durability. In particular, when film processing such as laminating is performed for the purpose of imparting moisture permeability and waterproof properties, tear strength tends to be remarkably lowered. Therefore, tear strength of preferably 2.0 kgf or more, more preferably 2.5 kgf or more ( It is particularly preferred to have L).
[0013]
In the product of the present invention, in the tear strength chart drawn by the single tongue method, the relationship between the tear strength (L) and the minimum point (S) must be L−S / L ≦ 0.5. This relationship is obtained because the polyamide multifilament of the present invention is a nylon 6 multifilament having a 10% elongation strength of 2.0 to 3.0 cN / dtex and a breaking elongation of 35 to 50%. When the strength and elongation characteristics of nylon 6 multifilament do not satisfy this range, the relationship between tear strength (L) and minimum point (S) does not satisfy L−S / L ≦ 0.5. The reason for this is that when the elongation is low, the number of yarns that are torn during the process of tearing is reduced, and the stress per yarn tends to concentrate. And the relationship between the tear strength (L) and the minimum point (S) does not satisfy L−S / L ≦ 0.5. However, in the present invention, since the number of yarns to be torn is dispersed due to the high elongation and the stress per one piece is reduced, the drop in tear strength when cut is reduced, and the tear strength (L) and the minimum The relationship between the points (S) satisfies L−S / L ≦ 0.5. Satisfying this relationship can be said to be a polyamide multifilament fabric having excellent high toughness. A method for measuring the tear strength (L) and the minimum point (S) will be described later.
[0014]
Further, it is desirable that the woven fabric of the present invention has a thickness of 0.15 mm or less and a basis weight of 100 g / m 2 or less. When the thickness is larger than 0.15 mm, the texture is hard, or when the film is processed, it becomes thick, which is not preferable for sports applications. It is preferably 0.12 mm or less, more preferably 0.08 mm or less. And, regarding weighting, materials such as sleeping bags, tents, paragliders, parachutes, ski / snowboard wear, outdoor wear, etc., which are the main uses of the present invention, are required to be lightweight in terms of compactness and storage, The fabric weight is preferably 100 g / m 2 or less, more preferably 80 g / m 2 .
[0015]
The method for producing the polyamide filament used in the present invention is generally obtained by melt spinning a chip having a relative viscosity of 2.5 or more and 4.5 or less at a temperature of 250 to 300 ° C., and spinning drawing by a spin draw method. It can be produced by a continuous apparatus or an apparatus that performs spinning and stretching in two steps.
[0016]
The polyamide filament of the present invention is a filament having an amide bond classified as a synthetic fiber, represented by nylon 6, nylon 46 and nylon 66, and may be a copolymer or a mixture mainly composed of them. In order to improve hygroscopicity, a hygroscopic monomer may be copolymerized, or a core-sheath type composite fiber in which a hygroscopic resin is confined in the core may be used. Nylon 6 is preferably employed from the viewpoint of softness and cost, and is optimal for the polyamide multifilament fabric of the present invention.
[0017]
The cross-sectional shape of the nylon multifilament of the present invention is not particularly limited, and is represented by a round shape, a triangular shape, a hollow shape, and a cross shape, and may be an aggregate having different cross sections. Moreover, the deformity and the hollowness are not particularly limited. The number of filaments is not limited, but multifilaments formed of at least 10 filaments are used.
[0018]
Various additives added to the nylon multifilament of the present invention are not particularly limited, and a hygroscopic substance, an antioxidant, a matting agent, an ultraviolet absorber, an antibacterial agent and the like may be added alone or in combination. Further, mechanical properties other than the strong elongation properties of the nylon multifilament of the present invention, such as boiling water shrinkage rate, thermal stress, birefringence, and thickness spots, are within the normal range and are not particularly limited.
[0019]
Further, the polyamide filament of the present invention may be crimped such as false twist, or may be a mixed yarn or a composite yarn with filaments having different shrinkage ratios or different cross-sectional shapes.
[0020]
【Example】
Hereinafter, the present invention will be described based on examples. The evaluation method used in the present invention is as follows.
[0021]
(Explanation of evaluation method)
Relative viscosity:
The sample solution was prepared by dissolving the sample in 96.3 ± 0.1 wt% reagent-grade concentrated sulfuric acid so that the polymer concentration was 10 mg / ml, and the water dropped at a temperature of 20 ° C. ± 0.05 ° C. The relative viscosity of the solution is measured using an Ostwald viscometer of several to 7 seconds. In the measurement, using the same viscometer, the relative viscosity RV is calculated from the ratio of the drop time T0 (second) of 20 ml of sulfuric acid and the drop time T1 (second) of 20 ml of the sample solution, which is the same as when the sample solution was adjusted. Calculate using.
RV = T1 / T0
[0022]
Strength at 10% elongation: ST10 (cN / dtex), elongation at break: DE (%):
Instron Japan K.K. Model 4310 is used for measurement. Add 1/33 gram to the yarn fineness (dtex.) As the initial load, create an SS chart under the conditions of a yarn length of 20 cm and a tensile speed of 20 cm / min, and measure n = 3 for one sample. Read the elongation at break and the strength at 10% elongation from the chart and determine the average value of each.
Fineness (decitex):
Three 100 m polyamide multifilament cassettes were prepared, each weight (g) was measured, an average value was obtained, and multiplied by 100.
[0023]
Tearing strength (L) and minimum point (S):
The tear strength (single tongue A-1 method) defined in JIS-L-1096 was adopted, and measurement was performed at a tensile speed of 10 cm / min and a chart speed of 5 cm / min. The tear strength (L) and the minimum point (S) were determined by the following procedure.
1 From the location excluding 0.5 cm from the first maximum point of the waveform drawn on the chart,
Divide evenly at intervals of 1.25 cm, and read the tear strength at the maximum point and the next largest point within each equal portion.
2 The average value of the tear strength at the read maximum point and the next largest point was determined and used as the tear strength (L).
3 Next, read the tear strength of the local minimum point and the next smaller point in each equal division.
4 2. In the same manner as described above, the average value of the tear strengths of the minimum point and the next smallest point was obtained and set as the minimum point (S).
3 However, if there is evidence of thread slippage, it is not regarded as a minimum point. Returning to the procedure, the operation was repeated equally.
[0024]
Thickness:
For fabrics not subjected to film processing, the fabric thickness (mm) is measured at five random locations with a thickness meter, and the average value is obtained.
About the cloth which is film-processed, five places are measured at random from observation by SEM, and the average value is obtained.
[0025]
Example 1
Nylon 6 polymer having a relative viscosity of ηr = 3.51 was melt-spun from a die having 24 round holes at a spinning temperature of 280 ° C., drawn at a spinning speed of 3200 m / min and a drawing temperature of 160 ° C., and a strength at 10% elongation. Of 2.70 cN / dtex and a multifilament of 33 dtex 24 filaments with a breaking elongation of 43.0%. As a woven warp, the multifilament is glued using an acrylate copolymer ammonium salt type plus size J-30 manufactured by Kyoyo Chemical Industry Co., Ltd. in a non-twisted state, and the weft is not glued. The yarn was used as it was in the untwisted state, and was set to a warp density of 165 yarns / in and a weft yarn density of 136 yarns / in, and woven with a ripstop structure. In addition, weaving property was good, warp breakage and fluff were not generated, the operating rate of the loom was high, and the obtained raw machine was also of high quality. The obtained raw machine was refined and dyed and finished according to a conventional method to obtain a woven fabric having a warp density of 175 yarns / in and a weft density of 144 yarns / in. The resulting fabric has a warp tear strength (L) of 3.7 kgf, LS / L = 0.29, a weft tear strength (L) of 3.0 kgf, and LS / L = 0.28. Was 0.08 mm and the basis weight was 43 g / m 2 . The texture was very soft, and the fabric was excellent in tearing strength despite being thin. Further, when laminating was performed according to a conventional method, the tear strength was 2.0 kgf for the transverse tear strength and 1.8 kgf for the weft tear strength, which was sufficient for sports applications. The results are shown in Table 1.
[0026]
(Example 2)
Nylon 6 polymer having a relative viscosity ηr = 3.51 was melt-spun from a die having 34 round holes at a spinning temperature of 285 ° C., drawn at a spinning speed of 2300 m / min and a drawing temperature of 160 ° C., and a strength at 10% elongation. Was 2.39 cN / dtex and a 44 dtex 34 filament multifilament having a breaking elongation of 47.4% was obtained. In the same manner as in Example 1, the multifilament was glued for warp, the weft was used as it was without twisting, and the warp density was set to 145 / in and the weft density was set to 120 / in. Weaving was performed. Similar to Example 1, weaving property was good, warp breakage and fluff were not generated, the operating rate of the loom was high, and the obtained raw machine was also of high quality. The obtained raw machine was refined and dyed and finished according to a conventional method to obtain a woven fabric having a warp density of 157 yarns / in and a weft density of 124 yarns / in. The resulting woven fabric has a warp tear strength of 4.7 kgf, LS / L = 0.31, a weft tear strength of 4.4 kgf, LS / L = 0.41, a thickness of 0.10 mm, and a basis weight of 52 g / m 2 . The texture was very soft, and it was a polyamide multifilament woven fabric having high toughness with excellent tear strength despite being thin. The results are shown in Table 1.
[0027]
(Comparative Example 1)
In Example 1, Example 1 was followed except that the draw ratio of the multifilament was changed and the strength at 10% elongation was 3.20 cN / dtex and the elongation at break was 33.0%. Compared to Example 1, the resulting fabric had a tear tear strength of 3.1 kgf, LS / L = 0.60, a weft tear strength of 2.8 kgf, LS / L = 0.58, and a thickness of 0. 0.08 mm, and the basis weight was 43 g / m 2 . Although the texture was very soft, the tear strength was weaker than that of Example 1, and the woven fabric had a high LS / L value and a large fluctuation in waveform. The results are shown in Table 1.
[0028]
(Comparative Example 2)
In Example 2, a nylon 66 polymer having a relative viscosity ηr = 3.2 was used to prepare a multifilament of 44 dtex 34 filaments. The resulting nylon 66 multifilament had a 10% elongation strength of 2.80 cN / dtex and a breaking elongation of 33.2%. Using the nylon 66 multifilament, a woven fabric was obtained in exactly the same manner as in Example 2 below. The resulting fabric has a warp tear strength of 2.9 kgf, LS / L = 0.70, a weft tear strength of 3.2 kgf, LS / L = 0.75, a thickness of 0.10 mm, and a basis weight. Was 52 g / m 2 . Although the texture was very soft, it was a polyamide multifilament woven fabric having a lower tear strength than that of Example 2, a LS / L value was high, and the woven fabric had a large waveform fluctuation. The results are shown in Table 1.
[0029]
[Table 1]
[0030]
【The invention's effect】
According to the present invention, the sleeping bag, tents, paraglider, parachute, ski / snowboard wear, which is excellent in soft and compact with the necessary tear strength even if it is thin, excellent in tearing strength even if thin. It has become possible to provide polyamide multifilament fabric suitable for materials such as outdoor wear and clothing.

Claims (4)

  1. Fineness of 60 dtex or less, 3.0 strength at 10% elongation from 2.0 cN / dtex, elongation at break 35% to 50% of nylon 6 multifilament is being woven in ripstop tissue, JIS-L- The tear strength (L) in the warp cutting direction and the weft cutting direction (L) described in 1096 is 1.5 kgf or more, and A polyamide multifilament woven fabric characterized in that the relationship of local minimum points (S) is L−S / L ≦ 0.5.
  2. The polyamide multifilament fabric according to claim 1, wherein the polyamide multifilament fabric is a polyamide multifilament fabric having a fabric thickness of 0.15 mm or less and a fabric basis weight of 100 g / m 2 or less.
  3. The polyamide multifilament fabric according to claim 1 or 2, wherein the organization of the fabric is a ripstop organization.
  4. Fineness of 60 dtex or less, at 10% elongation of the strength 3.0 cN / dtex 2.0, the elongation at break 35% to 50% of nylon 6 multifilament performs gluing is untwisted, then in re Ppusutoppu Organizational A method for producing a polyamide multifilament woven fabric characterized in that both the warp cutting by the single tongue method described in JIS-L-1096 and the tearing strength (L) in the weft cutting direction are 1.5 kgf or more .
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