JP4622107B2 - False twisted yarn and method for producing the same - Google Patents

Description

（比較例１〜３）
実施例１と同じ未延伸糸を用い、加工速度４００（ｍ／ｍｉｎ）、糸条加熱体として、７５℃の加熱ピンを使用し、先延伸倍率を１．０〜１．２（倍）で行ない、その後、連続してフリクションタイプの施撚具でＤ／Ｙ比１．８、仮撚ヒータ温度１６０（℃）、仮撚延伸倍率０．９〜１．２５（倍）、トータル延伸倍率０．９〜１．４４（倍）で延伸仮撚り加工を行なった結果を表２に示した。
【００３３】
【表２】

【００３４】
【発明の効果】
本発明によれば、仮撚加工するに際し、糸条温度をＰＴＴのＴｇ温度４５℃以上１４５℃以下に加熱した状態で、先に予備延伸を行い、その後連続して仮撚加工することにより工程数が少なくできるため工程通過性が向上し、同時に毛羽数も減少可能となる。
【００３５】
また、仮撚加工において高温加工が可能になることにより、伸縮復元率が向上され、ストレッチのある編織物に適した仮撚加工糸が得られる。
【００３６】
また、加工糸伸度が抑えられるため、残留伸度が少なく、寸法安定性が良好で乾熱収縮率の低減され、織物のシボ、シワの発生が抑えられ優れた表面品位が得られソフトな風合でかつストレッチがある染色性良好な仮撚加工糸を得ることができる。
【図面の簡単な説明】
【図１】 図１は、本発明の予備延伸仮撚加工糸を得るための、仮撚装置の一例を示す工程図である。
【符号の説明】
１：未延伸糸
２：ガイド
３：延伸ローラー
４：ホットピン
５：フィードローラー
６：ヒータ
７：仮撚施撚具
８：デリベリーローラー
１１：テイクアップローラー
１２：巻取りチーズ
（交絡を施す場合）
９：交絡ノズル
１０：交絡ローラー
１１：テイクアップローラー
１２：巻取りチーズ[0001]
BACKGROUND OF THE INVENTION
The present invention is suitable for excellent woven or knitted fabric material for the stretch and the surface quality is related to the false twisted yarn contact and its manufacturing method of polytrimethylene terephthalate multifilament.
[0002]
[Prior art]
In general, polyester false twisted yarns are suitable for stretch materials and are currently widely used for clothing, but polytrimethylene terephthalate false twisted yarns having excellent texture and dyeability have been proposed.
[0003]
Conventionally, in Japanese Patent Application Laid-Open No. 11-302932, a method of performing a conventional false twisting process after performing a pre-stretching and then once performing a relaxation treatment when stretching a polytrimethylene terephthalate multifilament. Has been proposed. However, according to this method, although the stability in high-speed processing is improved, since the three steps of the pre-stretching step, the relaxation step, and the false twisting step must be passed, the cost increases due to an increase in the number of steps. There is a problem that process passability such as a decrease in processing yarn strength due to an increase in fluff deteriorates.
[0004]
Further, as proposed in JP-A-9-78373, after obtaining a drawn yarn by drawing an undrawn yarn, this drawn yarn is false twisted in a separate step, and false twisted crimped yarn is obtained. In the method for producing the yarn, after drawing the undrawn yarn and winding it up as a drawn yarn, a separate process is required to false twist the drawn yarn, leading to an increase in cost, Since many guides pass in the process of extending | stretching, there exists a problem which it becomes easy to generate | occur | produce fluff.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a polytrimethylene terephthalate multifilament false twisted yarn suitable for a knitted fabric excellent in stretchability and surface quality, and a production method.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present inventor has intensively studied, and after performing preliminary stretching under specific conditions, when performing false twisting, enables high temperature processing of false twisting, resulting in crimp characteristics. The present inventors have found a technique for obtaining the effects of improvement, suppression of false twisting yarn elongation and reduction of hot water shrinkage, and have completed the present invention.
[0007]
That is, the false twisted yarn of the present invention is a false twisted yarn comprising polytrimethylene terephthalate multifilament and satisfying the following formula.
[0008]
45 ≦ CR (%)
25 ≦ EX (%) ≦ 45
5 ≦ DS (%) ≦ 20
(However, CR: expansion and contraction recovery rate (%), EX: processed yarn elongation (%), DS: dry heat shrinkage rate (%))
The false twisted yarn production method of the present invention substantially comprises a polytrimethylene terephthalate multifilament yarn, and when the false twist is performed, the polytrimethylene terephthalate filament yarn temperature is set to 45 ° C. or higher and 145 ° C. or lower. By preliminarily stretching once in the heated state, and then performing false twisting at a total stretching ratio of 1.0 to 1.6 in the preliminary stretching and false twisting continuously when false twisting is performed. In addition, high temperature processing at a heat setting temperature of 150 ° C. or higher and 200 ° C. or lower becomes possible. As a result, the false twisted yarn of the present invention having a stretch recovery rate (CR) of 30% or more, a dry heat shrinkage rate of 5% or more and 30% or less, and a processed yarn elongation of 25 (%) or more and 45 (%) or less. It can be obtained.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail.
[0010]
The false twisted yarn of the present invention is essentially composed of polytrimethylene terephthalate (hereinafter sometimes abbreviated as PTT), and more specifically, terephthalic acid as the main acidic component, It is a polyester obtained by using 1,3 propanediol as the main glycol component. However, it may contain a copolymer component capable of forming another ester bond at a ratio of 20 mol%, more preferably 10 mol% or less. Examples of the copolymerizable compound include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, and sebacic acid, while glycol components include, for example, ethylene glycol and diethylene glycol. , Butanediol, neopentyl glycol, cyclohexane dimethanol, polyethylene glycol, polytrimethylene glycol and the like, but are not limited thereto.
[0011]
Further, titanium dioxide as a matting agent, silica or alumina fine particles as a lubricant, hindered phenol derivatives, coloring pigments, and the like as antioxidants can be added as necessary. The intrinsic viscosity of the polytrimethylene terephthalate is preferably 0.5 or more and 1.2 or less. If it is less than 0.5, it may be difficult to stably spin due to frequent unevenness of fineness and yarn breakage during spinning, and even if obtained, it may be inferior in practical aspects such as tensile strength and bending wear resistance. .
[0012]
Moreover, in this invention, it can spin stably by making intrinsic viscosity into 1.2 or less. More preferably, the intrinsic viscosity of polytrimethylene terephthalate is 0.8 or more and 1.0 or less.
[0013]
The cross-sectional shape of the single yarn of the fiber is not particularly limited, and other shapes such as circular, triangular, flat, hexagonal, hollow, indeterminate, bimetal, etc. The fineness ranges from 50 decitex to 1,000 decitex according to the purpose of use. May be selected as appropriate.
[0014]
The physical properties of the PTT processed yarn of the present invention are as follows: the stretch recovery rate is 45 (%) or more, the processed yarn elongation is 25 (%) or more and 45 (%) or less, and the dry heat shrinkage rate is 5 (%) or more and 20 (%) or less. It is necessary to be.
[0015]
First, when the expansion / contraction restoration rate of the PTT processed yarn is less than 45 (%), a sufficient stretch of 15% or more cannot be obtained when it is made into a woven fabric. In order to obtain a stretch of woven fabric of 15 (%) or more, a stretch recovery rate of 45 (%) or more is required. The expansion / contraction restoration rate is preferably 50 (%) or more, and more preferably 50 to 60 (%).
[0016]
The processed yarn elongation of the PTT processed yarn needs to be 25 (%) or more and 45 (%) or less. When the processed yarn elongation is less than 25 (%), it becomes easier to fluff or break when passing through the subsequent process, and since the processed yarn itself has a low elongation, the processed yarn stretch is also reduced, resulting in a woven fabric. Sometimes you don't get enough stretch. In addition, if the processed yarn elongation exceeds 45 (%), the processed yarn elongation is high, which tends to cause sinking. Also, when the fabric is dyed and processed, the shrinkage is increased and the texture is increased in the finishing process. Adjustment and surface quality adjustment are difficult, and wrinkles and wrinkles are likely to occur. The processed yarn elongation is preferably 30 (%) or more, more preferably 35 to 40 (%).
[0017]
If the dry heat shrinkage rate of the PTT processed yarn is 5 (%) or less, the texture of the fabric in the dyeing process becomes paper-like, so a soft texture cannot be obtained. In the relaxation process of time or dyeing, texture adjustment and surface quality adjustment are difficult, and wrinkles and wrinkles are likely to occur. The dry heat shrinkage rate is preferably 10 (%) or more, more preferably 10 to 15 (%).
[0018]
Therefore, in the present invention, it is necessary to set conditions that satisfy these three characteristics at the same time. If even one characteristic is deviated, the stretchability, the surface quality of the fabric, and the like are deteriorated, and the present invention is not completed.
[0019]
That is , according to the false twisted yarn production method of the present invention, when the polytrimethylene terephthalate filament yarn temperature is heated to 45 ° C. or higher and 145 ° C. or lower, preliminary stretching is performed once, and then false twisting is performed. By performing false twisting at a total draw ratio of 1.0 to 1.6 and preliminarily stretching and false twisting, and by performing high temperature processing at a heat setting temperature of 150 ° C. to 200 ° C. Three requirements can be obtained.
[0020]
The stretch recovery rate (%), false twisted yarn elongation (%) and temporary hot water shrinkage rate (%) in the present invention are measured by the following methods.
[0021]
(1) Expansion / contraction recovery rate (CR) (%)
The sample is wound 10 times on a measuring machine with a circumference of 0.8 m under a tension of 90 mg / dtex, and then suspended from a rod and left for about 24 hours. This casserole is hydrothermally treated at 90 ° C. for 20 minutes in a non-tensioned state, and then suspended on a rod and left for about 12 hours. Place one end of the cassette after leaving it on the hook, apply the initial load and measurement load to the other end, hang it in water and leave it for 2 minutes. At this time, the initial load (g) = 1.8 mg / dtex, the measurement load (g) = 90 mg / dtex, and the water temperature 20 ± 2 ° C. Let L be the inner length of the left casket. Furthermore, it is left for 2 minutes in a state where only the initial load is excluded except for the measurement load, and the inside length of the left case is measured to be L1. From this, the expansion / contraction restoration rate is obtained using the following equation.
Expansion and contraction rate (CR) (%) = {(L−L1) / L} × 100.
[0022]
(2) Processing yarn elongation (%)
According to the tensile test test method described in JIS-L-1013, 8.5.1 standard time test, it measured using the Instron type constant speed extension type tensile tester.
[0023]
(3) Dry heat shrinkage (%)
In accordance with JIS-L-1013, 8.18.2 casserole shrinkage (A) method, the dry heat shrinkage was determined using the following equation.
Dry heat shrinkage (%) = {(L−L1) / L} × 100.
[0024]
Next, an example of a production method for obtaining the PTT false twisted yarn of the present invention is shown in FIG. PTT unstretched yarn (1) of highly oriented unstretched yarn is unwound, supplied from the guide (2) to the prestretching roller (3), and prestretched by the feed roller (5) through the stretching pin (4). Do. After that, the feed roller (5) is supplied to the false twisting region, twisted by the false twisting tool (7), heat-set with the heater (6), pulled out from the delivery roller (8), and taken. It is a manufacturing method wound up as a PTT false twist cheese (10) with an up roller (9). Manufacture with entanglement process, if convergence is required, relax with relaxation roller (10), treat with entanglement nozzle (9), and wind up as PTT false twisted cheese (12) with take-up roller (11) Is the method. The method for producing a PTT false twisted yarn of the present invention is a method characterized in that a drawing step or preliminary drawing is performed before the false twisting step and then false twisting is continuously performed.
[0025]
In the present invention, the temporary twist heater temperature is 150 ° C. or more and 200 ° C. or less. However, if the heater temperature is less than 150 ° C., the heat setting property is insufficient and the expansion / contraction recovery rate (CR) is 45% or less, preferably Absent. Further, prior to false twisting as a condition for obtaining the false twisted yarn of the present invention, pre-stretching is first performed in a state where the yarn temperature is heated to 45 ° C. or higher and 150 ° C. or lower, and then the temporary twist is continuously performed. It is necessary to twist.
[0026]
When the yarn temperature is less than 45 ° C., the strength is remarkably reduced due to the vicinity of the glass transition point of PPT, fluff is generated due to poor drawing at the time of preliminary drawing, and drawing becomes uneven and yarn breakage occurs. When the temperature exceeds 150 ° C., the strength of the PTT is significantly reduced by heat, and fluff is generated and yarn breakage occurs as in the case of 45 ° C. or less.
[0027]
In the present invention, it is particularly important to perform false twisting continuously after preliminary stretching. That is, by being guided to the false twist region while the yarn at the time of pre-drawing is in a tensioned state, the heat fixing effect of the yarn is increased, the expansion / contraction recovery rate (CR) is increased, and the false twisted yarn It is considered that the residual elongation can be suppressed and the dry heat shrinkage rate can also be reduced.
[0028]
The processing magnification and false twist number of the false twisting process may be set in consideration of the final processed yarn elongation, and the total draw ratio (1.0 ≦ first draw ratio × false twist draw ratio) that does not cause fluff or yarn breakage. By processing within the range of ≦ 1.6), the residual elongation of the false twisted yarn can be suppressed, the dry heat shrinkage rate can be reduced, and the preliminary drawing effect can be sufficiently exhibited. Moreover, as a combination of a pre-drawing ratio and a false twist drawing ratio, a pre-drawing ratio of 1.0 (times), a false twist drawing ratio of 1.35 (times), a total draw ratio of 1.35 (times), and a pre-drawing ratio of 1. 0 (times), false twist draw ratio 1.0 (times), total draw ratio 1.0 (times), etc. can be processed, but first draw ratio 0.9 (times), false twist draw ratio 1. When the total draw ratio is 5 (times) and the total draw ratio is 1.35 (times), if the film is relaxed during the pre-drawing, the yarn becomes slack and the yarn breakage frequently occurs and the processing becomes impossible. Times) or more, and it is important that the total draw ratio is 1.0 (times) to 1.6 (times).
[0029]
The temperature is preferably 160 ° C. or higher and 200 ° C. or lower, more preferably 175 ° C. or higher and 190 ° C. or lower, in order to have high stretch false twisted yarn characteristics. However, when the temperature exceeds 200 ° C., there is a problem that yarn breakage due to a decrease in strength due to heat increases even in a sufficiently high orientation state due to pre-stretching. Need to be set. The heating method for pre-stretching can be either a contact type such as a pin type or a non-contact type such as a tube heater. The entanglement process is determined by the use of processed yarn, texture, single yarn use, and composite use. Yarn can be processed by single yarn processing or composite processing. As a use of the processed yarn, it is preferably used as a woven fabric, but since the texture is dry and does not stick to the skin, it is suitably used for yukata and kimono.
[0030]
【Example】
Next, the present invention will be specifically described with reference to the examples summarized in Table 1.
[0031]
(Examples 1-4)
Using a highly oriented unstretched yarn of 130 dtex 36 filament and elongation of 109.8 (%) as the unstretched yarn, a processing speed of 400 (m / min), and using a heating pin of 75 ° C. as the yarn heater, The first draw ratio is 1.0 to 1.2 (times), and then continuously with a friction type twisting tool, D / Y ratio 1.8, false twist heater temperature 160 (° C.), false twist draw ratio Stretch false twisting was performed at 1.0 to 1.6 (times) and a total draw ratio of 1.0 to 1.6 (times) to produce false twisted yarns. Table 1 shows the false twisted yarn characteristics of stretch recovery rate (CR) (%), processed yarn elongation (%), and dry heat shrinkage rate (%). The false twisted yarn thus obtained was made into a plain woven fabric, subjected to normal dyeing finish, and subjected to a sensory evaluation on the stretchability of the fabric and the surface quality, wrinkles, wrinkles and texture of the fabric.
[0032]
[Table 1]

(Comparative Examples 1-3)
Using the same undrawn yarn as in Example 1, a processing speed of 400 (m / min), a heating pin at 75 ° C. as a yarn heating body, and a predrawing ratio of 1.0 to 1.2 (times) After that, continuously with a friction type twisting tool, D / Y ratio 1.8, false twist heater temperature 160 (° C.), false twist draw ratio 0.9-1.25 (times), total draw ratio 0 Table 2 shows the results of stretching false twisting at .9 to 1.44 (times).
[0033]
[Table 2]

[0034]
【The invention's effect】
According to the present invention, when false twisting is performed, the yarn is heated to a PTT Tg temperature of 45 ° C. or higher and 145 ° C. or lower, preliminarily stretched first, and then false twisted. Since the number can be reduced, process passability is improved, and at the same time, the number of fluffs can be reduced.
[0035]
Moreover, by enabling high-temperature processing in false twisting, the stretch recovery rate is improved, and false twisted yarn suitable for a knitted fabric with stretch can be obtained.
[0036]
In addition, since the processed yarn elongation is suppressed, the residual elongation is small, the dimensional stability is good, the dry heat shrinkage is reduced, the occurrence of wrinkles and wrinkles in the fabric is suppressed, and excellent surface quality is obtained and soft. A false twisted yarn with good texture and good dyeability can be obtained.
[Brief description of the drawings]
FIG. 1 is a process diagram showing an example of a false twisting device for obtaining a predrawn false twisted yarn of the present invention.
[Explanation of symbols]
1: Undrawn yarn 2: Guide 3: Drawing roller 4: Hot pin 5: Feed roller 6: Heater 7: False twisting tool 8: Delivery roller 11: Take-up roller 12: Winding cheese (when entangled)
9: Entangling nozzle 10: Entangling roller 11: Take-up roller 12: Winding cheese

Claims (2)

A false twisted yarn comprising polytrimethylene terephthalate multifilament and satisfying the following formula.
45 ≦ CR (%)
25 ≦ EX (%) ≦ 45
5 ≦ DS (%) ≦ 20
(However, CR: expansion and contraction recovery rate (%), EX: processed yarn elongation (%), DS: dry heat shrinkage rate (%)) When the polytrimethylene terephthalate multifilament is stretched in a state of being heated to 45 ° C. or higher and 145 ° C. or lower and subsequently continuously twisted at a heater temperature of 150 ° C. or higher and 200 ° C. or lower, the draw ratio (Pe in the heated state) ) And the false twisting ratio (Fe), the false twisting process is performed under the condition that the relationship between the total draw ratios satisfies the following formula:
1.0 ≦ Pe × Fe ≦ 1.6
Pe: Heated stretch ratio (times)
Fe: false twist draw ratio (times)

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