Poly(propylene terephthalate) fiber and its manufacturing method, as well as processed yarn and its manufacturing method

Abstract

The polypropylene terephthalate fiber of this invention exhibits a peak thermal stress of 0.1 to 0.8 cN / dtex within a temperature range of 40 to 100°C, and a breaking elongation of 60 to 200%. Furthermore, the fiber manufacturing method of this invention involves melting and solidifying polypropylene terephthalate, winding it at a speed of 1000 m / min or higher, heating it with a heating roller at ±20°C of the glass transfer point, extending it by 1.0 to 2.0 times, then winding it around a heating roller at 50 to 150°C, and finally winding it at a speed of 2000 to 4800 m / min.

Description

Technical field

[0001] The invention relates to polypropylene terephthalate fibers with excellent processability and a method for manufacturing the same. In more detail, there are polypropylene terephthalate fibers with high shrinkage stresses with high elongation and excellent step passability during processing and the fabrication method of those. Prior technology

[0002] Polypropylene terephthalate (sometimes referred to hereafter as “PTT”) obtained by polycondensation of terephthalic acid with lower alkanes of terephthalic acid represented by dimethyl terephthalate and propylene glycol (1,3-propylene glycol) is used in fibers with low elasticity (soft touch), excellent elasticity at the same time Polymers with properties similar to polyamide in terms of sexual recovery, stainability, and properties similar to polyethylene terephthalate (hereafter sometimes referred to as “PET”) fibers in light resistance, thermal fixity, dimensional stability, and low water absorption are utilized in BCF carpets, brushes, and tennis wires.

[0003] Thus, as fiber morphologies used to utilize the above characteristics of polypropylene terephthalate fibers (hereafter sometimes referred to as “PTT fibers”) made of this polymer, various processed yarns are known. Among them, the fake cock processed yarns of PTT fibers, compared with other polyester fibers with similar molecular configuration to PTT fibers such as PET fibers, are more rich in elastic recovery, flexibility, and are expected to be extremely excellent as raw yarns for stretching.

[0004] However, although previous PTT fibers have the intrinsic advantages of high elastic recovery and excellent flexibility, they have the problem of low step passability when processing, especially PTT fibers with smaller single-fiber fibers.

[0005] Therefore there are limitations of processing methods, especially the problem of inability to adequately improve the characteristics of machined yarns such as curling properties.

[0006] For example, PET fibers of general purpose fibers are widely implemented in manufacturing methods of various processed yarns using partially aligned yarns with high production speeds (hereinafter sometimes referred to as “POY”). In particular, the use of extended dummy machining (so-called “POY-DTY machining”) etc. The manufacturing method of partial alignment yarn is also highly productive, and machining yarns with excellent winding properties can be obtained.

[0007] Therefore, various processing methods for PTT fibers, which have similar properties to PET fibers, have been explored. These methods utilize partially oriented fibers of PTT (hereinafter sometimes referred to as "PTT-POY").

[0008] For example, in Patent Document 1, in order to improve the processability of its fibers, a proposal is made to apply a specific finishing agent to PTT-POY fibers with a birefringence of 0.059 and an elongation of 71% wound at 3300 m / min. Furthermore, Patent Document 2 discloses PTT-POY fibers with a birefringence of 0.062 and an elongation of 74% wound at 3500 m / min, which are treated with a specific finishing agent.

[0009] However, the PTT-POY fiber disclosed in the aforementioned patent documents suffers from deformation due to the significant shrinkage of the yarn on the yarn bobbin during fiber winding, which prevents the yarn package from being unloaded from the spindle of the winding machine. Therefore, even when using high-strength yarn bobbins to suppress deformation, a bulging phenomenon (similar to swelling on the sides of the yarn package) or tight binding of the inner layers of the yarn package can still occur. Consequently, the tension when unwinding the yarn from the bobbin increases, and the tension fluctuation also becomes larger. During processing using PTT-POY fiber, numerous problems arise, including pilling, yarn breakage, uneven shrinkage, or uneven dyeing.

[0010] To address these issues, Patent Document 3 examines the method of applying heat before winding to reduce deformation. Patent Document 4 examines the use of partially oriented yarns spun at speeds below 2500 m / min, which reduces productivity. Conversely, Patent Document 5 proposes fibers drawn at high speeds of 4500-8000 m / min, with reduced peak temperatures of thermal stress.

[0011] However, the aforementioned processes involving PTT fibers all have issues with permeability. Consequently, it is ultimately difficult to produce processed yarns with high crimping properties using previously used partially oriented yarns (POY) made from PTT fibers. [Previous Technical Documents] [Patent Literature]

[0012] Patent Document 1: Japanese Patent Application Publication No. 11-229276 Patent Document 2: International Publication No. 1999-39041 Patent Document 3: Japanese Patent Application Publication No. 2001-254226 Patent Document 4: Japanese Patent Application Publication No. 2015-7306 Patent Literature 5: Bulletin of Japan Special Kai 2001-348729 Contents of the invention

[0013] [Invention of topics to solve]

[0014] The invention is accomplished in view of the above background for the purpose of providing flexible polypropylene terephthalate fibers with excellent processability and methods of fabrication thereof. [Means used to solve problems]

[0015] The polypropylene terephthalate fiber of the present invention is a polypropylene terephthalate fiber composed of more than 90 mole% of repeating units of propylene terephthalate, characterized by satisfying both the requirements of (A)~(C) described below. (A) In the temperature-thermal stress curve of the fiber, there is a peak of thermal stress in the range of temperature 40~100°C, (B) The peak value of this thermal stress in (A) is 0.1~0.8 cN / dtex, (C) The elongation at break of the fiber is 60~200%.

[0016] Thereby the minimum elasticity in the elongation 10% to 30% of the better fiber is 0.1~3 cN / dtex, or the birefringence (Δn) of the fiber is above 0.03 or less than 0.08, and the specific gravity is more than 1.319 and less than 1.340.

[0017] Another invented method of manufacturing polypropylene terephthalate fibers is characterized by melting and curing polypropylene terephthalate more than 90 mole% consisting of propylene terephthalate repeating units and then curling them at a curling speed above 1000m / min .

[0018] Further the present invention comprises a processed yarn made using the polypropylene terephthalate fibers described above, or the processing yarn thereof is a dummy machined yarn, and a method of manufacturing the processed yarn. [Invention Effect]

[0019] Polypropylene terephthalate fibers with excellent strength and processability are provided in accordance with the present invention and a method of fabrication thereof. Simple Explanation of the Diagram

[0020] [Figure 1] is a schematic diagram used to illustrate the maximum value of thermal stress in the temperature-thermal stress curve of a fiber. [Figure 2] is a schematic diagram illustrating the method for determining the maximum curling stress and the maximum curling elongation. [Figure 3] is a schematic diagram showing an example of irregular cross-sectional yarn shape and irregularity. [Figure 4] is a schematic diagram showing an example of flat cross-sectional yarn shape and irregular shape. Implementation

[0021] The present invention will now be described in detail.

[0022] (1) Polymer raw materials The polymer used in this invention will be described below. The polyester polymer that forms the fiber of this invention is poly(propylene terephthalate) (PTT), which consists of 90 moles or more of repeating units of propylene terephthalate. PTT, as used herein, is a polyester with terephthalic acid as the acid component and propylene glycol (1,3-propanediol) as the glycol component. This PTT may also contain up to 10 moles of other copolymer components.

[0023] Examples of such copolymerizing components include ester-forming monomers such as sodium isophthalic acid 5-sulfonate, potassium isophthalic acid 5-sulfonate, tetrabutyl strontium salt of 3,5-dicarboxylic acid benzenesulfonate, tributylmethyl strontium salt of 3,5-dicarboxylic acid benzenesulfonate, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexanediol, 1,4-cyclohexanediethanol, adipic acid, dodecanoic acid, and 1,4-cyclohexanedicarboxylic acid.

[0024] Furthermore, depending on the requirements, various additives such as matting agents, heat stabilizers, defoamers, colorants, flame retardants, antioxidants, ultraviolet absorbers, infrared absorbers, nucleating agents, and fluorescent whitening agents can be copolymerized or mixed.

[0025] The limit viscosity [η] of the polymer used in the present invention is preferably 0.5~1.5 and more preferably 0.75~1.2. In this range fibers with excellent strength and spinning properties can be obtained. When the limit viscosity does not reach 0.5, because the molecular weight of the polymer is too low, yarn breakage or fluffing is prone to occur during spinning or processing, and it is difficult to exhibit the required strengths such as dummy-handed processing yarns. On the contrary, when the ground limit viscosity exceeds 1.5, due to excessive melt viscosity, melt rupture or poor spinning is produced during spinning. Also, the limit viscosity [η] is the assay value described later in the term of the inventive embodiment.

[0026] The preparation method as a polymer used in the present invention may directly use the familiar method. Terephthalic acid or dimethyl terephthalate and propylene glycol are also about to be used as raw materials, one or more metal salts of a mixture of titanium tetrabutoxide, calcium acetate, magnesium acetate, cobalt acetate, titanium dioxide and silicon dioxide are added, and the reaction is under normal pressure or under pressure, followed by the addition of catalysts of titanium tetrabutoxide and antimony acetate at reduced pressure at 250~270°C. At any stage of polymerization, it is preferable to place a stabilizing agent before the polymerization condensation reaction, this is the view that improves whiteness, improves melting stability, and can inhibit the generation of organic matter with a molecular weight of less than 300 for PTT oligomers or acrolein, and allyl alcohol. As a stabilizer in that case, preferably 5- and / or 3-valent phosphorus compounds or hindered phenolic-based compounds.

[0027] (2) Polypropylene terephthalate fiber Polypropylene terephthalate fibers (PTT fibers) of the present invention are polymers consisting of more than 90 mole% of the above mentioned repeating units of propylene terephthalate. Further such PTT fibers can be obtained by melting the spun yarn by the method described later, by extension, heating, and the like.

[0028] Moreover, the PTT fibers of the present invention must simultaneously satisfy the requirements of (A)~(C) described below. (A) In the temperature-thermal stress curve of the fiber, there is a peak of thermal stress in the range of temperature 40~100°C. (B) The peak value of this thermal stress in (A) above is 0.1~0.8cN / dtex. (C) The elongation at break of the fiber is 60~200%.

[0029] First, the PTT fiber of the present invention must exist in the temperature-thermal stress curve of the fiber in the range of temperature 40~100°C a peak value that becomes the maximum (maximum value) of the thermal stress (hereafter sometimes referred to as "thermal shrinkage stress"). The peak value of the thermal stress here is the value of the maximum (peak) of the thermal stress corresponding to the point at which the differential coefficient of that temperature-thermal stress curve changes from positive to negative when depicting the temperature-thermal stress curve of the fiber as shown in Fig. 1 . and the so-called maximum value of thermal stress refers to the value at which the becoming maximum of each peak in the whole temperature range.

[0030] The peak value of this thermal stress is only in the range below 40°C, and the fiber shrinks significantly after curling and curling occurs. and the peak value of this thermal stress is too high in the range above 100°C, and the flexibility derived from PTT fibers cannot be obtained even as a processed yarn. Especially when the fake cock processing yarn, it is difficult to impart high curl. The better range for the peak of the thermal stress to exist is more than 50°C and below 100°C.

[0031] Furthermore, if the peak value of that thermal stress, as described above, exists in the range of temperature 40~100°C, it does not hurt to have more than 1 peak, for example, in the range above 100°C. In this case, the peak value of the thermal stress present in the range above 100°C can be greater or less than the peak value of the thermal stress present in the range of temperature 40~100°C, but the peak value in the range of 40~100°C for the better temperature is the maximum of the maximum value of each peak.

[0032] The PTT fibers of the present invention must have peak values ​​of the above-mentioned thermal stresses in the range of 0.1~0.8cN / dtex. The better is 0.11~0.6 cN / dtex, the better is 0.13~0.5 cN / dtex, and the extra best is in the range of 0.15~0.4 cN / dtex. The peak value of this thermal stress is too small, which will cause the tension during machining to decrease, the curling, etc. to become smaller. On the other hand, when the peak value of that thermal stress is too large, the tension during processing becomes too high, which becomes the cause of yarn breakage and loses flexibility.

[0033] Furthermore, the breaking elongation of the PTT fibers of the present invention must be 60~200%. The breaking elongation does not reach 60% due to the low elongation, fluffing and breakage are prone to occur during spinning or processing. On the other hand, when the elongation at the break exceeds 200%, it is prone to time change due to excessively low fiber alignment, and the fibers become very brittle even when stored at room temperature. Processed yarns of a certain quality in industry cannot be stably obtained in this situation. The optimal range of fracture elongation is 70~180%, the better range is 75~150%, and the extra optimal range is within the range of 80~130%.

[0034] Therefore the greatest feature of the PTT fiber of the present invention is a thermal stress peak of 0.1~0.8cN / dtex in the range of temperature 40~100°C. The PTT fibers of the present invention become fibers with inhibited crystallization by having heat shrinkage stress-like peaks in the range, which are compared in the degree of alignment. On the contrary, when the crystallization of PTT fibers is too high, the thermal stress peak at the high temperature side above 100°C becomes larger, and the peak of its thermal stress also tends to exceed 0.8cN / dtex. and in the case where the peak of thermal stress does not reach 0.1cN / dtex, the alignment degree is small, which deteriorates the passability of subsequent steps and prevents adequate processing. Especially the curling performance caused by dummy machining is practically insufficient.

[0035] The PTT fibers of the present invention become fibers with excellent processability by resorting to the peak temperature and stress values ​​of thermal stress as a suitable range without the occurrence of curling or subsequent yarn breakage during processing. Thereby, especially when performing extended dummy processing, it becomes an excellent fiber with both processability and curling properties.

[0036] Thus the single fiber fineness of the PTT fibers of the present invention is preferably 0.3~6.0dtex, more preferably 0.5~3.2dtex, and extra optimally 0.6~3.0dtex. When the single fiber fiber is too large, the fabric flexibility is lost due to the coarser single yarn. and when the single fiber fineness is less than 0.3dtex, yarn breakage occurs frequently and it is difficult to manufacture fibers.

[0037] Further, the number of fiber yarns during spinning as the PTT fiber of the present invention is preferably 3~500, more preferably 5~300, and especially 10~200. Moreover as the total fiber of the yarn made of such fiber yarns is preferably 10~200dtex, more preferably 20~150dtex. The total fiber is too small, the total fiber is too fine, and subsequently difficult to process. On the other hand, when the total fiber is too large, the softness of the fabric using the processed yarn after processing is lost.

[0038] Furthermore, the better shrinkage of the PTT fibers of the present invention in warm water at 65°C is 1~50%. When the shrinkage rate of 65°C warm water is too high, the structure is not fixed, even if the fibers are stored at room temperature, they still become brittle, and there is a situation where the production of processed yarns can not be stabilized without the occurrence of fluffing and breaking. Also, when the shrinkage rate in warm water at 65°C is too low, due to the progress of crystallization, the fibers become brittle, or not easily deformed, so fluffing, breakage occurs and it is difficult to carry out dummy processing.

[0039] Further, the fiber variation value U% of the PTT fibers of the present invention is preferably 0~2%. Here, the value of the change in fineness U% of the PTT fiber is the value obtained from the mass change of the fiber sample in the Half Inert mode using USTER TESTERUT-5 manufactured by Zellweger Uster Co., Ltd. With the apparatus the change in mass can be determined by resorting to the change in the dielectric coefficient when passing the fiber sample between the electrodes. Since the fibers obtain an uneven curve when passing through the device at a certain speed, the value of the change in fiber U% (hi%) can be found from its results. When the value of the change in fineness U% (hi%) exceeds 2%, fluffing or breaking of yarn often occurs during processing of the dummy, and there are cases where only processed yarns with uneven dyeing or uneven curling can be obtained. The fineness change value U% (hi%) is preferably less than 1.5% and more preferably less than 1.0%. The lower the U%, the better.

[0040] Further, the optimal minimum elasticity in the elongation length of 10% to 30% of the PTT fibers of the present invention is in the range of 0.1~3cN / dtex. and thus preferably in the range of 0.1~2cN / dtex. Minimum elasticity in elongation 10% to 30% When the elongation is too low, the tension during processing will decrease, which will make the curling smaller, unstable tension during yarn processing becomes the cause of staining spots and therefore poor. On the other hand, when that elasticity rate is too large, the tension during processing becomes larger, which becomes the cause of yarn breakage, and the loss of flexibility is therefore poor.

[0041] Further, the birefringence index (Δn) of the polypropylene terephthalate fiber of the present invention is preferably above 0.03 and below 0.08. Birefringence (Δn) too small, in, for example, the machining accompanied by subsequent extensions there is a tendency for the step passability of the yarn to decrease. There is thus a tendency for the curling performance to be easily insufficient after processing. On the other hand, when the birefringence index (Δn) is too large, it is easy to cause curling, which reduces the passability of the steps during spinning or post-processing.

[0042] Further, the specific gravity of the polypropylene terephthalate fiber of the present invention is preferably 1.319 or more or less than 1.340. Again here, the specific gravity of the fibers is proportional to the degree of crystallization. When the specific gravity is small, it is easy to cause curling. Processing difficulties especially in machining accompanied by extension. On the other hand, when the specific gravity is larger, it is poor due to the frequent occurrence of fluffing. There is a tendency to not easily curl when post-processing for dummy processing.

[0043] Based on the view of step stability, the cross-sectional shape of the PTT fibers of the present invention is preferably a solid circular cross-section, but it can also be an irregular-type cross-sectional fiber or a hollow fiber. For example, as PTT fibers of the present invention, it may also be constituted of irregular-type cross-sectional fibers or flat-sectioned fibers of a cross-shaped section or a triangular section, or a star-shaped section, in which case a unique texture can be obtained and thus preferably. However, when the irregular type or flattening is too large, there is a tendency to fluff or deteriorate poor stability when spinning the yarn.

[0044] Thus the PTT fibers of the present invention are fibers in which the temperature range in which the peak value of thermal stress exists or its peak value (maximum value) and the elongation at break fall in a suitable numerical range, and it is a fiber that has both alignment and degree of crystallization of the moderately amorphous part. Thus the PTT fibers of the present invention are particularly preferable for use after processing including high-speed extension processing. Especially in extended dummy processing, it can inhibit the curling of the fiber yarn strips before and after processing. Further by carrying out POY-DTY processing using PTT fiber, high winding properties of processed yarn can be obtained, can obtain the process of curling and elongation of the processed yarn.

[0045] Further the PTT fibers of the present invention can be processed stably even if the single yarn fineness of the fibers is reduced and are most suitable for manufacturing soft textured fabrics. Moreover, the PTT fibers of the present invention can maintain stabilizer properties for a long period even in the state of the partial alignment yarn before post-processing, which is particularly useful in industry.

[0046] (3) Fabrication method of polypropylene terephthalate fiber This polypropylene terephthalate fiber (PTT fiber) can be glassed by PTT by curling the melted and cured polypropylene terephthalate (PTT) at a curling speed of more than 1000m / min The glass transition point was heated by a heating roll of ±20°C, followed by a 1.0~2.0-fold extension, and then obtained by winding at a speed of 2000~4800m / min after being wound in a heating roll of 50~150°C.

[0047] As a melt-cured PTT polymer self-spun yarn, the curling speed of the metal cover just after spinning must be a speed of 1000m / min or more, but further preferably 1000~4000m / min, especially 1300~3000m / min. At this time when curled at less than 1000m / min, the alignment at the PTT mainly in the amorphous part was smaller, and eventually a PTT yarn with adequate partial alignment could not be obtained. Moreover, the curling of the raw yarn becomes larger, and the maximum value of the heat shrinkage stress becomes smaller. In that case, in the subsequent dummy cock machining, etc., high winding performance could not be obtained.

[0048] and the temperature of the treatment once the coiled PTT fiber is about to be extended must be cryogenic heating in the range of ±20°C of the glass transition point of the PTT. The further optimal range is the glass transition point minus 20°C and plus 10°C, but the particularly optimal range is the glass transition point minus 15°C and plus 5°C. When the fibers are set at a low temperature of -20°C before the glass transition point, the fibers cause shrinkage of the neck during extension, which makes the extension point unstable and the gauze spot enlarges. There is a tendency to make the shrinkage part become a high temperature exceeding the glass transition point +20°C due to the shrinkage neck causing the fiber to heat up. On the other hand, when the heating treatment is implemented at a heating roller at a temperature above the glass transition point +20°C, the extension tension decreases and the swing of the traveling yarns is unstable, making the yarns in contact with each other and becoming the cause of yarn breakage. Also, polypropylene terephthalate (PTT) has a glass transition point at low temperatures below 55°C due to becoming a different sawtooth-like molecular configuration from polyethylene terephthalate (PET) of the same polyester fiber.

[0049] Furthermore, the heating treatment of a heating roller with a glass transition point ±20°C in the fabrication method of the present invention is preferably set to a stable and suitable temperature range for fibers wound several times on a self-driven metal roller.

[0050] Further before the above-mentioned low-temperature heating roller treatment, it is preferable to resort to rapid cooling by blowing or oil-agent attachment treatment during the melting and curing of the polymer to pre-reduce the fiber temperature.

[0051] and as the preferably the cycle speed of the roller for cryogenic heating immediately prior to the extension treatment is a speed of 1000~4000m / min, which is further preferably a speed of 1300~3000m / min, especially a speed of 1700~2500m / min.

[0052] Therefore in the manufacturing method of the PTT fiber of the present invention, the treatment followed by the low-temperature heating roller must be extended at 1.0 times~2.0 times. When the extension magnification is less than 1.0 times, that is, when not extended, the alignment degree of the amorphous part of the polymer becomes low, the fiber relaxes and problems such as unspun yarn occur. On the other hand, at extension magnifications greater than 2.0 times, the degree of crystallization is too large, making it difficult to carry out effective post-processing. For example, in extended dummy machining, high curlability cannot be imparted. and further as the extension magnification of that low-temperature extension, preferably greater than 1.03 times and not up to 2.0 times, more preferably in the range of 1.05 times~1.8 times, and extra optimally in the range of 1.1 times~1.6 times.

[0053] In the fabrication method of the present invention, it is important to perform an extension at a comparative low temperature near such a glass transition point. Incidentally, in the usual high-temperature heating extension, the alignment or degree of crystallization of the polymer molecules becomes higher, and the maximum value of the peak of thermal stress moves to the high-temperature side above 100°C. Such reduced fiber break elongation makes it difficult to perform effective post-machining, especially post-processing such as pseudo-pin curling machining accompanied by extension.

[0054] Then in the manufacturing method of the present invention, it must be heated with a heating roller of 50~150°C after the extension at low temperature. Here as a treatment utilizing heated rollers, it is also better to wind multiple secondary fibers on self-driven metal rollers. Below 50°C, the degree of crystallization is insufficient, and the yarn after curling relaxes and cannot be rolled stably. Also at temperatures higher than 150°C when wound in the heating roller, crystallization is too high, the tension becomes higher during yarn processing, and the extension magnification cannot be improved during post-processing. For example, in extended dummy machining, adequate curling could not be imparted.

[0055] In the fabrication method of the PTT fibers of the present invention, the stability or post-processability during preservation is improved by the recourse of continuous extension and thermal fixation at comparatively low temperatures in the vicinity of such a glass transition point. Moreover, the obtained PTT fibers have similar properties to the previously known PET-POY and become PTT partially aligned fibers with excellent step passability.

[0056] and thus as the final winding speed of the melted and cured PTT fibers wound after the heating roller must be in the range of 2000 m / min to 4800 m / min. Further optimal in the range of 2200m / min to 4000m / min, especially in the range of 2400m / min to 3500m / min. When the final curling speed is less than 2000m / min, due to the low alignment of the fibers, the fibers become brittle, especially when the fibers are preserved under high temperature and high humidity, and the processing of the fibers and the processing of the extended dummy become difficult. On the other hand, when the curling speed of the PTT fibers cured after melting exceeds 4800m / min, the crystallization progresses and the elongation of the fibers becomes too low, making it unsuitable for various subsequent post-processing. And linting or breakage is easy to occur during spinning or dummy processing.

[0057] and the better tension during curling is 0.02~0.20 cN / dtex. If the previously carried out melt-spun yarns such as PET or nylon are rolled at such a low tension, the yarn travel is unstable, the yarn will detach from the horizontal arm of the curling machine and breakage, or switching errors occur when the winding yarn is automatically switched to the next yarn tube in automatic winding machines.

[0058] However, this problem does not occur with PTT fibers even when wound at extremely low tension, and a better packaged yarn with a smooth, knot-free winding can be obtained by setting the tension to low. However, if the tension is too low, it becomes difficult to guide the yarn across the winding machine, resulting in poor packaging such as bulging, and there is a tendency for the yarn to detach from the cross arm and break. Conversely, if the tension is too high, there is a tendency for the knots to become stronger over time. The preferred tension during winding is 0.025~0.15 cN / dtex, and the ideal tension is 0.03~0.10 cN / dtex.

[0059] In this invention, interlacing can also be performed as needed during the spinning process. Interlacing can be performed at any of the following times: before applying the finishing agent, before heat treatment, before winding, or at multiple points.

[0060] As the winding machine used in this invention, any winding machine can be driven by a main shaft, a contact roller, or both a main shaft and a contact roller. However, a winding machine that drives both the main shaft and the contact roller is preferred because it can wind up a larger quantity. When only one of the contact roller or the main shaft is driven, the other rotates due to friction from the drive shaft. Therefore, the yarn bobbin mounted on the main shaft and the contact roller will have different surface speeds due to slippage. As a result, when the yarn winds from the contact roller onto the main shaft, the yarn will elongate or loosen, causing changes in tension and deteriorating the winding state. The yarn is also prone to damage due to friction. By driving both the main shaft and the contact roller, the surface speed difference between the contact roller and the yarn bobbin can be controlled, slippage can be reduced, and the yarn quality and winding state can be improved.

[0061] The lead angle during fiber winding is preferably 3.5° to 11°. If it is less than 3.5°, the yarns cannot cross each other, making them prone to slippage, spiderweb-like patterns, or bulging. Furthermore, if it exceeds 11°, the amount of yarn wound at the ends of the yarn tube increases, resulting in a larger end diameter than the central diameter. Therefore, only the ends contact the contact rollers during winding, leading to deterioration of yarn quality. Additionally, the tension fluctuations when the wound yarn is unwound increase, often resulting in pilling or yarn breakage. The lead angle is more preferably 4° to 10°, and particularly preferably 5° to 9°. This yields a packaged yarn tube made from the specific polyester fiber of this invention.

[0062] The PTT fibers obtained by such a manufacturing method of the present invention become fibers of so-called partially aligned fibers (POY) said to be moderately aligned of the polymer molecules constituting the fibers. With the usual method of manufacturing POY of polyester fibers, melting and spitting can only be carried out at high-speed spinning yarns with a rolling speed (spun yarn speed) of 2500m / min or more, and extension treatment with reduced elongation is usually not possible. However, in the present invention, in order to improve the preservation stability and processability of PTT, a heat treatment at a comparatively low temperature and consequently high temperature near the glass transition point is a necessary condition. In the fabrication method of the present invention, such rapid succession of heat treatment after extension at low temperature has the effect of improving the preservation stability of PTT fibers.

[0063] (4) Processed yarns made of polypropylene terephthalate fibers Processed yarns of the present invention are processed yarns using polypropylene terephthalate fibers (PTT fibers) described above. Further the processed yarn of the present invention is preferably a fake knitted processed yarn.

[0064] Thus as a better present invention the same dummy jelly processing yarn is preferably in order to satisfy the following physical properties.

[0065] Also, as a polypropylene terephthalate dummy processing yarn (hereafter sometimes referred to as “PTT dummy processing yarn”), preferably more than 90 mole% polypropylene terephthalate composed of repeating units of propylene terephthalate and simultaneously satisfying the requirements (1)~(6) described below.

[0066] (1) Single fiber fiber: 3.2dtex or less (2) Fracture strength ≧2.5 cN / dtex (3) Elongation at break: 20~80% (4) Maximum curl elongation ≧150% (5) Maximum compression stress ≧0.020 cN / dtex

[0067] Further the single-fiber fiber of the PTT dummy processing yarn of the present invention is better than 3.2dtex. Further preferably above 0.1dtex, or 0.3~3.2dtex, but more preferably at 0.5~3.0dtex, and more preferably at 0.6~2.4dtex. When the single fiber fiber is greater than 3.2dtex, the fabric flexibility is lost due to the coarseness of the single yarn. and the single fiber fiber over hours, frequent yarn breakage and inability to make fiber.

[0068] Furthermore, the better breaking strength of the PTT dummy machining yarn of the present invention is 2.5cN / dtex or more. The better range is 2.5~4.0 cN / dtex, and the extra optimal range is 2.7~3.7 cN / dtex. The practical use is difficult when the fracture strength is less than 2.5cN / dtex.

[0069] Also, the fracture elongation of the PTT dummy machining yarn of the present invention is preferably 20~80%. Thereby the better is in the range of 22~70%, or the extra best is in the range of 26~60%. When the breaking elongation does not reach 20%, there is a tendency to fluff or break the yarn during spinning or dummy processing due to too low elongation. On the other hand, the tendency of the fracture elongation to exceed 80% will cause the plastic deformation of the fiber to be too large and deteriorate the morphological stability.

[0070] Furthermore, the maximum curl elongation of the PTT dummy machining yarn of the present invention is preferably 150% or more. When the maximum curl elongation does not reach 150%, there is a tendency to have low curl elongation without adequate stretchability.

[0071] Furthermore, the maximum curling stress of the PTT dummy machining yarn of the present invention is preferably above 0.020 cN / dtex. When the maximum curling stress does not reach 0.020cN / dtex, there is a tendency for the rolling strain to become lower and the pullback to weaken.

[0072] Previously, stable quality PTT fiber processed yarns with such fine texture or excellent skin touch and large breaking elongation with excellent curling characteristics could not be obtained. In the present invention, these physical properties can be obtained for the first time in post-processed yarns by resorting to the use of PTT fibers in which the temperature range present at the maximum value of the thermal stress or whose maximum value and elongation at break fall in a moderate numerical range. Polyester processed yarns with excellent stretchability that characterize PTT fibers are easily elongated even at low loads can be obtained.

[0073] Furthermore, the fineness change value (regular%) of the PTT dummy machining yarn of the present invention is preferably less than 2.0%. When the fiber change value U% (regular%) exceeds 2.0%, especially during the processing of dummy, there is a tendency to become unevenly dyed or unevenly curled dummy processed yarn. U% (regular%) is preferably less than 1.5%. The lower the U%, the better.

[0074] The value U% (regular%) of the change in fineness of the dummy jersey processed yarn here is the value obtained from the mass change of the fiber sample using USTER TESTER UT-5 made by Zellweger Uster Co., Ltd. With the apparatus the change in mass can be determined by resorting to the change in the dielectric coefficient when passing the fiber sample between the electrodes. Uneven curves are obtained when passing through the device at a certain speed. From its results the value of the change in fiber U% (regular%) can be found.

[0075] Further the total fiber of the PTT dummy processing yarn of the present invention is preferably 10~200dtex, and further preferably is 15~150dtex or more, especially in the range of 20~60dtex. When the total fiber is less than 10 dtex, the total fiber is too fine and difficult to become a processed yarn. On the other hand, when the total fiber is greater than 200dtex, it is poor due to loss of fabric flexibility.

[0076] Further, the PTT dummy yarn processing yarns of the present invention may also be constructed of irregular-type cross-section fibers such as cross-shaped or triangular cross-sections, or star-shaped sections, in which case a unique texture can be obtained and thus preferably. The so-called irregular type degree of the irregular type profile fiber here is shown in Fig. 3. Determine the maximum inscribed circular diameter r and the minimum external tangent circular diameter R of the fiber profile with irregular type = R / r. When the irregular type does not reach 1.15, the difference with the circular section becomes small and therefore poor. And when the irregular type exceeds 10.0, the alignment difference between the outer and inner sides of the yarn profile shape during spinning becomes larger, and the resulting yarn has more fluff and looseness, and is not suitable for processing.

[0077] Furthermore the PTT dummy machining yarn of the present invention may also be composed of flat cross-sectioned fibers, if so a unique texture can be obtained and therefore preferably. The flatness of the fibers in the so-called flattened profile here, as shown in Fig. 4, depicts a rectangle cut out from the fiber profile, determines its long side L and short side H, the value calculated with flatness = L / H, in the present invention, the value of flatness = L / H is preferably 2.0~10.0. When the flatness does not reach 2.0, it is poor due to the smaller difference with the circular section. And when the flatness exceeds 10.0, the spinning yarn is prone to fluffing and poor stability therefore poor.

[0078] (5) Manufacturing method of processed yarns made of polypropylene terephthalate fibers PTT-processed yarns of the present invention as described above may be manufactured by processing polypropylene terephthalate fibers (PTT fibers) through the above invention. Further as a processed yarn of the present invention, preferably a dummy processed yarn manufactured by the PTT fiber of the present invention by dummy processing.

[0079] Also, the PTT-processed yarns of the present invention can be obtained by post-processing PTT fibers made of polypropylene terephthalate composed of more than 90 mole% of repeating units of propylene terephthalate while satisfying the requirements of (A)~(C) below. (A) In the temperature-thermal stress curve of the fiber, there is a maximum of thermal stress in the range of temperature 40~100°C, (B) The maximum value of this thermal stress in (A) is 0.1~0.8 cN / dtex, (C) The minimum elasticity in elongation 10% to 30% is 0.1~2cN / dtex.

[0080] Each of the above elements from (A) to (C) is the same as the constituent elements of the PTT fibers of the present invention as described previously.

[0081] Further in the manufacturing method of the PTT processed yarn of the present invention, the one having the physical properties of the preceding PTT processed yarn is preferable.

[0082] In the present invention, the PTT fibers described above may obtain PTT dummy processed yarns of purpose by resorting to dummy processing under the following conditions, for example. ‧Fake condition Fake Machine Type: HTS-15V by TMT Machinery Co., Ltd. (Disc Fake Method) Disc speed: 1000~20000rpm (dish diameter 3~10cm) Feed-in speed: 500~1000m / min 1st feed-in rate: -5.0~+5.0% 1st heater temperature (non-contact): 200~300°C 2nd heater temperature (non-contact): 150~250°C 2nd feed-in clamp Pinch roller speed: 600~1500m / min 2nd feed-in rate: -5.0~+5.0% Feed-in Rate Before Curling: -5.0~+5.0% In addition to the above-mentioned disc type extended dummy machining, friction type dummy processing machines with clamp pinch type and the like are also suitable for utilizing the highly productive features of the PTT fibers of the present invention in high-speed extended dummy machining. Also, the previous type of sales type, air heating type, etc. of the fake cock processing machine can also be used.

[0083] The PTT fibers of the present invention as described previously are fibers in which the temperature range in which the peak value of the thermal stress exists or whose peak value and elongation at break are within a suitable numerical range. Therefore the fabrication method of the processed yarn using the PTT fiber, even for the PTT fiber, is also a fabrication method that is adequately inhibited and subsequent step passability such as the occurrence of the PTT fiber. It is especially applicable to the manufacturing method of so-called extended dummy machining included in extended machining at high speeds. Moreover, PTT-processed yarns with small single yarn fineness where step passability is usually more difficult can also be obtained.

[0084] The manufacturing method of the PTT-processed yarn of the present invention produces adequate thermal stress during the processing step for stabilization processing. Therefore the elasticity of the curling of PTT machined yarns in the elongation process becomes larger, and as a result, PTT dummy-stitch machined yarns with greater maximum winding stress and excellent pullback can be obtained.

[0085] Thus the invention comprises the invention described below.

[0086] 1. A polypropylene terephthalate fiber which is a polypropylene terephthalate fiber composed of more than 90 mole% of repeating units of propylene terephthalate characterized by simultaneously satisfying the requirements of (A)~(C) below. (A) In the temperature-thermal stress curve of the fiber, there is a peak of thermal stress in the range of temperature 40~100°C, (B) The peak value of this thermal stress in (A) is 0.1~0.8 cN / dtex, (C) The elongation at break of the fiber is 60~200%.

[0087] 2. A polypropylene terephthalate fiber as described above 1, where the minimum elasticity in the elongation of the fiber from 10% to 30% is 0.1~3cN / dtex.

[0088] 3. Polypropylene terephthalate fiber as described above 1 or 2, wherein the fiber has a birefringence index (Δn) above 0.03 or less than 0.08, and a specific gravity above 1.319 or less than 1.340.

[0089] 4. A method for manufacturing polypropylene terephthalate fiber characterized by melting and curing polypropylene terephthalate more than 90 mole% composed of repeating units of propylene terephthalate and curling at a curling speed of more than 1000m / min. This was followed by heating with a heating roller of ±20°C at the glass transition point of polypropylene terephthalate, followed by a 1.0~2.0-fold extension, and then winding at a speed of 2000~4800m / min after being wound in a heating roller of 50~150°C.

[0090] 5. A processed yarn made using polypropylene terephthalate fiber as in any of the above.

[0091] 6. The processed yarn as described above 5, wherein the processed yarn is a dummy machined yarn.

[0092] 7. A method of manufacturing a processed yarn such as above 5.

[0093] 8. A polypropylene terephthalate dummy machined yarn consisting of more than 90 mole% polypropylene terephthalate composed of repeating units of propylene terephthalate and simultaneously satisfying the requirements of (1)~(6) below. (1) Single fiber fiber: 3.2dtex or less (2) Fracture strength ≧2.5 cN / dtex (3) Elongation at break: 20~80% (4) Maximum curl elongation ≧150% (5) Maximum compression stress ≧0.020 cN / dtex.

[0094] 9. The polypropylene terephthalate dummy process yarn as described above 8 has a total fineness of 10~200dtex.

[0095] 10. The polypropylene terephthalate dummy processing yarn as described above 8 or 9, wherein the polypropylene terephthalate dummy machining yarn is made of irregular type profile fibers with an irregular type degree of 1.15~10.0.

[0096] 11. The polypropylene terephthalate dummy machined yarn as in any one of the above mentioned 8 to 10, wherein the polypropylene terephthalate dummy jelly machined yarn is made of flat cross-section fibers with a flatness of 2.0~10.0.

[0097] 12. A method of manufacturing a machined yarn characterized by processing a polypropylene terephthalate fiber as in any one of 1 to 3 above.

[0098] 13. A method of fabricating a dummy-prong processing yarn characterized by dummy processing a polypropylene terephthalate fiber as in any of the above 1 to 3 . [Example]

[0099] Embodiments and comparative examples of the invention are elaborated secondly, but the invention is not limited by those. Furthermore, each assay item in the embodiment is determined by means of the following method.

[0100] (1) Limit viscosity [η] The limit viscosity [η] was obtained by extrapolating the specific viscosity ηsp at 35°C, o-chlorobenzene minute to the specific ηsp / C of concentration C (g / 1

[0101] (2) Specific gravity The specific gravity of the sample was determined based on the flotation and sinking method of JIS-L-1013 8.17.1.

[0102] (3) Birefringence (Δn) According to page 969 of the Fiber Ready-Raw Materials chapter (5th edition, issued by Maruzen Co., Ltd. in 1978), using an optical microscope and a compensator, from the delay of the polarization observed on the fiber surface.

[0103] (4) Maximum of Thermal Stress The temperature present and the maxima of thermal stress KE-2 made by Bell Textile Engineering Company was used. The assay was performed at an initial overweight of 0.044 cN / dtex and a rising temperature of 100°C / min. The obtained data were set as temperature on the horizontal axis and thermal stress (heat shrinkage stress) on the longitudinal axis to be plotted to depict the temperature-thermal stress curve. Find the temperature, thermal stress (thermal shrinkage stress) at the point at which the differential coefficient of that temperature-thermal stress curve changes from positive to negative, and find the maximum stress for that stress divided by the fiber.

[0104] (5) 65°C Warm Water Shrinkage (HWS) Based on JIS-L-1013, the hot water temperature was set to 65°C and the change in the size of the stranded yarn was found, set to the shrinkage rate in warm water at 65°C.

[0105] Using a scale detector with a frame circumference of 1.125m, an initial load of 0.27cN / dtex was applied and rolled back at a speed of 120 times / min to make a small yarn with 40 rolls. A load of 20 times the initial load was applied to determine the length L 0 (mm) of the yarn. Secondly, the load was removed, the sample was immersed in warm water at 65°C for 30 minutes and removed, dried naturally again A load of 20 times the initial load was applied to determine the length of the skein L 1 (mm), and the warm water shrinkage was calculated by the following formula.

[0106] (6) Fiberness Fineness of multifiber yarns was determined according to JIS-L-1013. and the single fiber fiber is obtained by dividing its value by the number of single yarns of the multifiber yarn.

[0107] (7-1) Fiber Variation Value U% (PTT Fiber; hi%) USTER TESTER UT-5 made by Zellweger Uster Co., Ltd. was determined under the following conditions in Half Inert mode. Yarn supply speed: 400m / min Determined yarn length: 2000m.

[0108] (7-2) Fiber Variation Value U% (Processed Yarn; Regular %) USTER TESTER UT-5 made by Zellweger Uster Co., Ltd. was determined under the following conditions in Half Inert mode. Assay conditions Yarn supply speed: Regular mode Yarn speed: 200m / min Number of fucks: 10,000 times / minute fuck Tension Range: 10 Determined fiber length: 2,000m Yarn supply speed: 400m / min Determined yarn length: 2000m.

[0109] (8) Breaking strength, breaking elongation (fiber breaking strength, fiber breaking elongation) Based on JIS-L-1013 TENSILON made by ORIENTEC (Stock) Company using a fixed-speed elongation type tensile testing machine was determined at a clamp spacing of 20 cm and a tensile speed of 20 cm / min.

[0110] (9) Minimum elastic modulus in elongation of 10% to 30% Based on JIS-L-1013, using the TENSILON manufactured by ORIENTEC Co., Ltd. with a constant speed elongation type tensile testing machine, the measurement was carried out with a grip interval of 20 cm and a tensile speed of 20 cm / min. The tangent slope with the smallest slope among the tangents of the SS curve in the elongation range of 10% to 30% was obtained as the elastic modulus.

[0111] (10) Glass transition point The glass transition point is obtained from the heating curve of heating from room temperature to 300 °C at a heating rate of 10 °C / min in a nitrogen atmosphere by differential scanning calorimetry (DSC) with a specified amount of polymer pellets sealed in an aluminum sample pan. <(

[0112] (11) Crimp performance A sample of polyester false twist textured yarn was wound on a hank frame under a tension of 0.044 cN / dtex to make a hank (yarn) with a coarseness of about 3300 dtex. Two loads of 0.00177 cN / dtex and 0.177 cN / dtex were applied to one end of the hank, and the length S0 (cm) after 1 minute was measured.

[0113] Next, in the state where the load of 0.177 cN / dtex was removed from the hank, it was treated in boiling water at 100 °C for 20 minutes. After the boiling water treatment, the load of 0.00177 cN / dtex was removed from the hank, and it was naturally dried in a free state without load for 24 hours. The two loads of 0.00177 cN / dtex and 0.177 cN / dtex were applied to the hank again, and the length S1 (cm) after 1 minute was measured.

[0114] Next, the length S2 (cm) after 1 minute was measured with the load of 0.177 cN / dtex removed from the hank, and the crimp ratio was calculated using the following formula, and the average value of 10 measurement values was calculated. Crimp ratio (%) = [(S1 - S2) / S0] × 100 At this time, if the crimp ratio is 30% or more, it is marked as ○ for those with high crimp performance, and if the crimp ratio is less than 30%, it is marked as × as it cannot be said to have high crimp performance.

[0115] (12) Maximum crimp stress and maximum crimp elongation of false twist textured yarn The stress-elongation curve of dummy-handled processing yarns was determined by the following method‧conditions. a.Remove the dummy pin processing yarn in boiling water for 30 minutes and leave it in air at room temperature for more than 4 hours to dry. Secondly, the stress-elongation curve at full stress up to 0.882cN / dtex was depicted according to JIS-L-1013 (tensile test method). b.On the stress-elongation curve determined by the above method‧conditions, as shown in Fig. 1, find the intersection of the curve tangent of the process (initial) of coiling and elongation and the curve tangent of the process of elongation of the fiber itself. The value obtained by dividing the stress corresponding to that intersection by the fineness of the machined yarn was set as the maximum curling stress. and the elongation corresponding to that intersection is set to the maximum convolution elongation.

[0116] [Example 1] Dimethyl terephthalate and 1,3-propylene glycol were fed in at a molar ratio of 1:2, and titanium tetrabutoxide equivalent to 0.1 wt% of dimethyl terephthalate was added to complete the transesterification reaction at a heater temperature of 240°C at normal pressure. This was followed by the addition of 0.1 wt% of titanium tetrabutoxide of the theoretical polymer amount and 0.5 wt% of titanium dioxide of the theoretical polymer amount and reacted at 270°C for 3 hours. The resulting polymer was constructed of 100 mole% repeating units of propylene terephthalate with a limit viscosity of 1.0.

[0117] Also, the glass transition point of the obtained polymer was 51°C.

[0118] The resulting polymer was dried by the usual method, melted at 265°C after moisture became 50ppm, and extruded at a spitting amount of 25.9g / min through a spun yarn mouth arranged in one row of 36 hole openings with a diameter of 0.27mm.

[0119] After rapid cooling of the extruded molten multifiber yarn with a blowing air speed of 4.0 m / min to a solid multifiber yarn, an oil containing octyl stearate 60 wt%, polyoxyethylene alkyl ether 15 wt%, and potassium phosphate 3 wt% were made into a water emulsion finisher with a concentration of 10 wt%.

[0120] Secondly, after winding the solid multifiber yarn in a roller of 2100m / min at a circumference speed of 2100m / min heated to 55°C, it was wound in a 1.3-fold extension to the roller heated to 80°C. The obtained fiber properties are noted in Table 1 . After determining the thermal stress of the obtained fibers, the first peak of thermal stress was greater at 61°C and thermal stress of 0.20cN / dtex, and the second peak was smaller at 191°C and less than 0.08cN / dtex.

[0121] Further using the obtained fibers obtained above, dummy processing is carried out in such a way that the elongation of the obtained processed yarn becomes 40% of the extension dummy processing extending to 1.3 times by the following conditions. The curling characteristics of the obtained dummy-handled processing yarns are shown together in Table 1 . ‧Fake condition Fake Machine Type: HTS-15V by TMT Machinery Co., Ltd. (Disc Fake Method) Disc speed: 5900 rpm (disc diameter 5.8cm) Feed-in speed: 462m / min 1st feed-in rate: ±0% 1st heater temperature (non-contact): 280°C 2nd heater temperature (non-contact): 280°C 2nd feed-in clamp Pinch roller speed: 600m / min Feed-in Rate 2: 1.0% Feed-in rate before scrolling: 3.0%.

[0122] [Example 2] In addition to changing the spit amount of the polymer, the heat treatment after attaching the oil agent, and the extension magnification, a fiber-wound cylinder yarn-like package of 100dtex / 36 roots (f) was obtained as in the same implementation as in Example 1.

[0123] The speed of the solid multifiber yarn being wound in a drum heated to 55°C is also increased from 2100m / min at a weekly speed to 2300m / min, and the extension rate is changed from 1.3 times to 1.2 times, subsequently replacing a heating roller at 80°C, and wound at 100°C. Subsequently using a winding machine in the manner of driving both the spindle and contacting the roller, the winding speed was 2650m / min. Also to be consistent with the final fiber, adjust the amount of polymer spit.

[0124] The obtained fiber properties are noted in Table 1 . After determining the thermal stress of the resulting fibers, the first peak of thermal stress was greater at 61°C and thermal stress of 0.17cN / dtex, but the second peak was smaller at 191°C and less than 0.08 cN / dtex.

[0125] Further using the obtained fibers described above, dummy processing is carried out in such a manner that the elongation of the obtained processed yarn becomes 40%. Extended dummy processing extending up to 1.3 times under the same conditions as in Example 1. The curling characteristics of the obtained dummy-handled processing yarns are shown together in Table 1 .

[0126] [Example 3] In addition to changing the spit amount of the polymer, the heat treatment after attaching the oil agent, and the extension magnification, a fiber-wound cylinder yarn-like package of 100dtex / 36 roots (f) was obtained as in the same implementation as in Example 1.

[0127] The speed of solid multifiber yarn wound in a roller heated to 55°C is also increased from 2100m / min to 2500m / min, the extension rate is changed from 1.3 times to 1.1 times, and subsequently in place of a heating roller at 80°C, and wound in a heated roller at 100°C. Subsequently using a curling machine in a manner that drives both the spindle and contacting the roller, the winding speed is 2700m / min. Also to be consistent with the final fiber, adjust the amount of polymer spit.

[0128] The obtained fiber properties are noted in Table 1 . After determining the thermal stress of the obtained fibers, the 1st peak of thermal stress was greater at 60°C and thermal stress of 0.13cN / dtex, but the second peak was smaller at 191°C and less than 0.08 cN / dtex.

[0129] Further using the obtained fibers described above, dummy processing is carried out in such a manner that the elongation of the obtained processed yarn becomes 40% extended dummy processing under the same conditions as in Example 1 but extending to 1.35 times. The curling characteristics of the obtained dummy-handled processing yarns are shown together in Table 1 .

[0130] [Example 4] In addition to changing the spit amount of the polymer, the limit viscosity of polypropylene terephthalate changed to 1.3 from 1.0 of Example 1, it was implemented as in Example 1 to obtain a solid multifiber yarn with the oil agent attached.

[0131] Subsequently, it was wound on a roller heated to 55°C with a speed speed of 2160m / min, which was then wound on a heated roller at 80°C with a 1.2-fold extension. Also to be consistent with the final fiber, adjust the amount of polymer spit. The glass transition point temperature of the obtained polymer changed to 52°C from 51°C in Example 1 .

[0132] The obtained fiber properties are noted in Table 1 . After determining the thermal stress of the obtained fibers, the first peak of thermal stress was greater at 63°C and thermal stress of 0.30cN / dtex, but the second peak was smaller at 191°C and less than 0.08 cN / dtex.

[0133] Further using the obtained fibers described above, dummy processing is carried out in such a way that the elongation of the obtained processed yarn becomes 40%. The curling characteristics of the obtained dummy-handled processing yarns are shown together in Table 1 .

[0134] [Example 5] In addition to changing the spit amount of the polymer, the heat treatment temperature after attaching the oil agent and also the fiber temperature at the time of extension treatment, a fiber-wound cylinder yarn-like package of 100dtex / 36 roots (f) was obtained as implemented in the same manner as in Example 1.

[0135] It is also about to change the temperature of the heating drum for winding solid multifiber yarn from 55°C to 40°C, the speed to be decelerated from 2100m / min to 2000m / min at a weekly speed, and the extension ratio to be maintained at 1.3 times, subsequently replacing the heating roller of 80°C, and the heating drum winding at 100°C. Subsequently using a winding machine in the manner of driving both the spindle and contacting the roller, winding at a winding speed of 2550m / min, a fiber-wound cylinder yarn-like package of 100dtex / 36 strands (f) was obtained. Also to be consistent with the final fiber, adjust the amount of polymer spit.

[0136] The obtained fiber properties are noted in Table 1 . After determining the thermal stress of the resulting fibers, the first peak of thermal stress was 61°C and thermal stress of 0.22cN / dtex, which is larger than that of Example 1 . and the second peak as in Example 1 is smaller at 191°C, 0.08 cN / dtex or less.

[0137] Further using the obtained fibers described above, dummy machining is implemented in such a way that the elongation of the resulting machined yarn becomes 40% Extended dummy processing is performed at the same conditions as in Example 1 but becoming an extension magnification of 1.35 times. The curling characteristics of the obtained dummy-handled processing yarns are shown together in Table 1 . Compared to Embodiment 1 Although the strength of the dummy machined yarn is reduced, the winding performance is more superior compared to Embodiment 1.

[0138] [Example 6] In addition to changing the spit amount of the polymer, the heat treatment temperature after attaching the oil agent and also the fiber temperature at the time of extension treatment, a fiber-wound cylinder yarn-like package of 100dtex / 36 roots (f) was obtained as implemented in the same manner as in Example 1.

[0139] It is also about to change the temperature of the heating drum for winding solid multifiber yarn from 55°C to 60°C, the speed to be decelerated from 2100m / min to 2000m / min at the weekly speed, and the extension rate to be maintained at 1.3 times, subsequently replacing the heating roller of 80°C, and the heating drum winding at 100°C. Subsequently using a winding machine in the manner of driving both the spindle and contacting the roller, winding at a winding speed of 2550m / min, a fiber-wound cylinder yarn-like package of 100dtex / 36 strands (f) was obtained. Also to be consistent with the final fiber, adjust the amount of polymer spit.

[0140] The obtained fiber properties are noted in Table 1 . After determining the thermal stress of the resulting fibers, the first peak of thermal stress was 63°C and thermal stress of 0.13cN / dtex, which is the same value as the other embodiments. However, the temperature of the 2nd peak was also 191°C, but its thermal stress was a higher value of 0.09cN / dtex.

[0141] Further using the obtained fibers described above, dummy machining is implemented in such a way that the elongation of the resulting machined yarn becomes 40% Extended dummy processing is performed at the same conditions as in Example 1 but becoming an extension magnification of 1.35 times. The curling characteristics of the obtained dummy-stitch processed yarns are shown in Table 1 . Compared to Embodiment 1 Although the curling performance of the dummy-handled machined yarn is reduced, it has superior winding performance than the comparison example.

[0142] [Comparative Example 1] Except for the amount of spitting of the polymer, no extension after attachment of the oil agent, a fiber-wound cylinder yarn-like package of 100dtex / 36 roots (f) was obtained by the same implementation as in Example 1. Also to be consistent with the final fiber, adjust the amount of polymer spit.

[0143] Also after obtaining a solid multifiber yarn with an oiled agent attached by the same method as in Example 1, the solid multifiber yarn is wound in a roller heated to 55°C at a circumference speed of 2510 m / min, and subsequently rolled at a curling speed of 2500 m / min without extension to obtain a cylinder yarn-like package.

[0144] The obtained fiber properties are noted in Table 1 . The birefringence is 0.047 and smaller, the maximum value of thermal stress is also the lower of 0.05cN / dtex. and high shrinkage in warm water, which is a poorly stable fiber when preserved.

[0145] Using the fibers obtained above, dummy processing was implemented in such a way that the elongation of the resulting processed yarn became 40% The extension dummy was performed under the same conditions as in Example 1 and with an extension multiplier of 1.3 times, but a majority of yarn breakage occurred during the extension dummy step and no sample could be taken.

[0146] [Comparative Example 2] In addition to not performing extension but accelerating the curling speed after attaching the oil agent, improving the fiber for alignment, a fiber-wound cylinder yarn-like package of 100dtex / 36 roots (f) was obtained as in the same implementation as in Example 1. Also to be consistent with the final fiber, adjust the amount of polymer spit.

[0147] Also after obtaining a solid multifiber yarn with oil attached by the same method as in Example 1, the solid multifiber yarn is wound in a roller heated to 50°C at a circumference speed of 3010 m / min, and subsequently rolled at a rolling speed of 3000 m / min to obtain the cylinder yarn-like package.

[0148] The obtained fiber properties are noted in Table 1 . The birefringence was improved from 0.047 of Example 1 to 0.052, but the maximum value of thermal stress was the lower of 0.06cN / dtex. and high shrinkage in warm water, which is a poorly stable fiber when preserved.

[0149] Using the obtained fibers described above, dummy machining was implemented in such a way that the elongation of the resulting machined yarn became 40% Extended dummy was performed under the same conditions as in Example 1 and with an extension multiplier of 1.3 times. Although no yarn breakage, etc. occurs and samples can be taken, but for poor curling performance.

[0150] [Comparative Example 3] In addition to performing a high-power extension after attaching the oil agent, a fiber-wound cylinder yarn-like package of 100 dtex / 36 roots (f) was obtained as implemented in the same manner as in Example 1.

[0151] Also after obtaining a solid multifiber yarn with oil attached by the same method as in Example 1, the solid multifiber yarn is wound in a relatively low speed roller heated to 55°C at a circumference speed of 900 m / min, and subsequently a high-power extension of 3.1 times is performed to obtain a cylinder yarn-like package at a curling speed of 2800 m / min.

[0152] The obtained fiber properties are noted in Table 1 . The birefringence is 0.065 and higher, and the maximum peak temperature of thermal stress is also higher at 190°C and 0.20cN / dtex. and the lower thermal stress value in the temperature range below 100°C.

[0153] Also using the obtained fibers above, dummy processing is implemented so that the elongation of the obtained processed yarn becomes 40% Extension dummy processing is performed under the same conditions as in Example 1 but the extension magnification is set to 1.05 times, although no yarn breakage, etc. occurs and the sample can be taken, but for poor curling performance.

[0154] [Comparative Example 4] Except that no extension and heat treatment were performed after attachment of the oil agent, but the curling speed was more accelerated than in Example 2, improving the alignment of the fibers, a fiber-wound cylinder yarn-like package of 100dtex / 36 roots (f) was obtained as implemented in the same way as in Example 1.

[0155] Also after obtaining a solid multifiber yarn with an oil agent attached by the same method as in Example 1, the solid multifiber yarn is wound in a roller with a circumference speed of 5650 m / min and subsequently curled at a curling speed of 5500 m / min to obtain the cylinder yarn-like packaging.

[0156] The obtained fiber properties are noted in Table 1 . The higher birefringence index of 0.082 and the specific gravity of the fiber polymer was also higher than 1.332. and is a fiber with a lower elongation at break of 55% and a high value of the variation in fiber.

[0157] Using the obtained fibers described above, dummy processing is implemented so that the elongation of the obtained machined yarn becomes 40% Extended dummy processing is performed under the same conditions as in Example 1 but the extension ratio is set to 1.1 times, although no yarn breakage, etc. occurs and the sample can be taken, but for poor curling performance.

[0158]

[0159] [Example 7] As in Example 1, dimethyl terephthalate and 1,3-propylene glycol were fed in at a molar ratio of 1:2 to obtain a polymer constructed from a repeat unit of 100 mole% of propylene terephthalate repeating unit with a limit viscosity of 1.0.

[0160] The resulting polymer was dried by the usual method, melted at 265°C after moisture became 50ppm, and extruded through a spun yarn mouth arranged in one row of 48 hole openings with a diameter of 0.27mm.

[0161] After rapid cooling of the extruded molten multifiber yarn with a blowing air speed of 2.0 m / min to a solid multifiber yarn, an oil containing octyl stearate 60 wt%, polyoxyethylene alkyl ether 15 wt%, and potassium phosphate 3 wt% were made into a water emulsion finisher with a concentration of 10 wt%.

[0162] Secondly, after winding the solid multifiber yarn in a roller of 2300m / min at a circumference speed of 2300m / min heated to 50°C, it was wound in a 1.2-fold extension to the roller heated to 80°C, and subsequently, a yarn-wrapped roller of 73dtex / 48 cylinders of yarn-wrapped (f) was obtained by curling at a speed of 2700m / min using a winding machine that drives both the spindle and contacting the roller.

[0163] The resulting yarn is secondly used to fabricate the dummy jelly processing yarn in a disc dummy fashion at an extension of 1.3 under the same conditions as in Example 1. The physical properties of the obtained processed yarns are shown in Table 2 .

[0164] [Example 8] In addition to changing the spun yarn metal cover and extruding through a spun yarn mouth arranged in one row of 24 hole openings with a diameter of 0.27 mm, a cylindrical yarn-like package of 73dtex / 24 strands (f) coiled with fibers was obtained as in Example 7.

[0165] Secondly the resulting fibers were processed under the same conditions as in Example 7 to obtain the dummy processing yarn. The physical properties of the obtained processed yarns are shown in Table 2 .

[0166] [Example 9] In addition to changing the spun yarn metal cover and extruding through a spun yarn mouth arranged in one row of 62 hole openings with a diameter of 0.27 mm, a cylindrical yarn-like package of fiber coiled with 56 dtex / 62 roots (f) was obtained as in Example 7.

[0167] Secondly the resulting fibers were processed under the same conditions as in Example 7 to obtain the dummy processing yarn. The physical properties of the obtained processed yarns are shown in Table 2 .

[0168] [Example 10] In addition to changing the spun yarn metal cover and extruding through a spun yarn mouth arranged in one row of 72 hole openings with a diameter of 0.20 mm, a cylindrical yarn-like package of fiber coiled with 73dtex / 72 roots (f) was obtained as in Example 7.

[0169] Secondly the resulting fibers were processed under the same conditions as in Example 7 to obtain the dummy processing yarn. The physical properties of the obtained processed yarns are shown in Table 2 .

[0170] [Example 11] In addition to changing the spun yarn metal cover, a metal cover in the shape of a cross section with a slit width of 0.6 mm and a length of 1.2 mm is extruded through a spun yarn mouth with a one-fold arrangement of 24 hole openings, a cylinder yarn-like package of 73dtex / 24 strands (f) coiled with fibers was obtained as in Example 7. The resulting irregular type profile veil has an irregular type degree of 2.2.

[0171] Secondly the resulting fibers were processed under the same conditions as in Example 7 to obtain the dummy processing yarn. The physical properties of the obtained processed yarns are shown in Table 2 .

[0172] [Example 12] In addition to changing the spun yarn metal cover to obtain a cylindrical yarn-like package of 73dtex / 24 strands (f) of fibers coiled in a cylindrical yarn-like package with a slit width of 0.06mm and a slit length of 0.5mm extending from the center in direction 3 from the center at an angle of 120°, extruded in the same manner as in Example 7. The resulting irregular type profile veil has an irregular type degree of 1.6.

[0173] Secondly the resulting fibers were processed under the same conditions as in Example 7 to obtain the dummy processing yarn. The physical properties of the obtained processed yarns are shown in Table 2 .

[0174] [Example 13] In addition to changing the spun yarn metal cover, a metal cover in the shape of a flat section with a slit width of 0.14 mm and a length of 1.4 mm is extruded through a spun yarn mouth arranged in one weight of 24 hole openings, which was implemented as in Example 7 to obtain a cylinder yarn-like package of 73dtex / 24 strands (f) coiled with fibers. The flattening of the resulting flattened cross-sectional veil was 3.4.

[0175] Secondly the resulting fibers were processed under the same conditions as in Example 7 to obtain the dummy processing yarn. The physical properties of the obtained processed yarns are shown in Table 2 .

[0176] [Compare Example 5] A cylindrical yarn-like wrapping of fiber coils of 73dtex / 48 roots (f) was obtained, except for no extension after attachment of the oil agent, which was implemented similarly as in Example 7.

[0177] It is also said that melt spinning was carried out under the same conditions as in Example 7. After winding the solid multifiber yarn to a roller heated to 50°C with a circumference speed of 2510m / min, unextended directly rolled at a rolling speed of 2500m / min to obtain a cylinder yarn-like packaging.

[0178] The thermal stress of the obtained fibers peaked at 55°C and at the peak was 0.08cN / dtex. and the minimum elasticity in the elongation of the fiber from 10% to 30% was 0N / dtex.

[0179] Secondly the resulting fibers were processed with dummy jerseys under the same conditions as in Example 7. Although processed yarns were obtained, the processed yarns could not be obtained due to broken yarns.

[0180] [Comparative Example 6] Except for the self-comparison Example 5 changing the spun yarn metal cover and extruding through the spun yarn mouth one-fold arrangement of the openings of 12 holes with a diameter of 0.30 mm, a cylinder yarn-like package of 108 dtex / 12 strands (f) (single yarn fineness 9.0 dtex) coiled with fibers was obtained as in Example 7.

[0181] The thermal stress of the obtained fibers peaked at 55°C and at the peak was 0.08cN / dtex. and the minimum elasticity in the elongation of the fiber from 10% to 30% was 0N / dtex.

[0182] Secondly the resulting fibers were processed at the same conditions as in Example 1 to obtain the dummy processing yarn. Can be processed yarn for the high curl of the fake cock, but the single yarn fiber is coarser, for the harder texture. The physical properties of the obtained processed yarns are shown in Table 2 .

[0183] [Comparative Example 7] The spun yarn metal cover was changed from Example 7 and extruded through a spun yarn mouth arranged in one heavy arrangement of openings of 36 holes with a diameter of 0.30 mm. Second, after winding in a roller heated to 50°C at a circumference speed of 1500m / min, after a 2.0-fold extension, it was wound in a roller heated to 130°C, and subsequently rolled at an extension rate of about 2 times at an extension rate of 2900m / min using a winding machine using a winding machine to drive both the spindle and the contact roller to obtain 95 dtex / 3 yarn-like packages of yarn-like rolls at a speed of 2900m / min.

[0184] The thermal stress of the obtained fibers peaked at 190°C and the thermal stress at the peak was 0.20cN / dtex. and the value of the thermal stress in the temperature range below 100°C is lower. and the minimum elasticity in the elongation of the fiber from 10% to 30% was 3.3N / dtex.

[0185] Both the degree of crystallization, and the degree of alignment progressed due to thermal extension, in the manner of the disc dummy of Example 7, with no dummy applied. Therefore, the fake cock processing yarn is obtained by resorting to the following false cock conditions. In this case, the processing speed can only be carried out at a processing speed of 100m / min relative to 600m / min in Example 7. The physical properties of the obtained processed yarns are shown in Table 2 . ‧Fake condition Type of Fake Machine: LS-2 Made by Mitsubishi Heavy Industries (Sell Counterfeit Method) Spindle speed: 27500 rpm Fake number: 3840T / m 1st feed-in rate: ±0% 1st heater temperature (contact): 160°C 2nd heater temperature (non-contact): 150°C 2nd feed-in rate: +15%

[0186] [Industrial Availability]

[0187] Polypropylene terephthalate fibers resistant to step tension during processing and their fabrication methods were obtained according to the present invention and with high elongation. Thereby obtaining polypropylene terephthalate processed yarn that does not easily cause yarn breakage during processing, with high winding properties, its industrial value is great.

[0188] R: Minimum circumradius r: Radius of the largest inscribed circle L: The longer side of the externally tangent rectangle H: Short side of the circumscribed rectangle

Claims

1. A polypropylene terephthalate fiber, which is a polypropylene terephthalate fiber composed of more than 90 mole% of repeating units of propylene terephthalate, characterized by simultaneously satisfying the following requirements of (A)~(C): (A) In the temperature-thermal stress curve of the fiber, there is a peak of thermal stress in the range of temperature 40~100°C. (B) In the temperature-thermal stress curve of the fiber, there is a peak of thermal stress in the range of temperature 40~100°C, and the peak of this thermal stress is 0.1~0.8cN / dtex, and (C) the elongation at break of the fiber is 60~200%.

2. The polypropylene terephthalate fiber of claim 1, wherein the minimum elasticity in 10% to 30% of the elongation of the fiber is 0.1~3cN / dtex.

3. The polypropylene terephthalate fiber of claim 1, wherein the fiber has a birefringence index (Δn) of 0.03 or more or less than 0.08 and a specific gravity of 1.319 or less.

4. A method for the manufacture of polypropylene terephthalate fiber characterized by melting and curing polypropylene terephthalate more than 90 mole% consisting of propylene terephthalate repeating units and then curling at a curling speed above 1000m / min .

5. A processed yarn made using polypropylene terephthalate fiber as in any one of claims 1 to 3.

6. If the processed yarn of claim 5, wherein the processed yarn is a dummy machined yarn.

7. A method of manufacturing processed yarn as in claim 5.

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