TWI677607B - Polyester filament - Google Patents

Abstract

The invention discloses a cotton imitation knitted fabric, a polyester fiber filament, and a production method thereof. The fabric is a weft knitted fabric woven from a woven material containing at least 45% by weight of polyester fiber filaments; the pore area distribution of the fabric is centered at 6000 to 22000 μm ² and dispersed at more than 2 σ, and the pore area is The coefficient of variation is greater than 40%. The polyester fiber filaments are alternately formed by false twist direction twist areas and reverse twist areas. The average length of the false twist direction twist areas is 0.3 cm or less, the length variation coefficient is 60% or more, and the diameter is the reverse twist area diameter. 30% to 70% of the total length of the polyester fiber filaments is 20.0% to 40.0%. The knitted fabric of the present invention has extremely strong cotton feel, and has good air permeability, bursting strength, water-absorbing quick-drying property and ultraviolet resistance.

Description

Polyester fiber filament and production method thereof

The invention relates to a cotton imitation knitted fabric, a polyester fiber filament and a production method thereof, and particularly relates to a cotton imitation knitted fabric suitable for making a T-shirt and a polyester fiber filament used as a raw material thereof.

At present, most of the knitted T-shirts on the market are cotton fibers. Compared with chemical fiber T-shirts, they have two major advantages: good softness and water absorption. However, the shortcomings of cotton products are gradually exposed during use, such as Both the air permeability and the quick-drying property are relatively poor. In addition, with the continuous increase of market demand, there is a certain pressure on the supply of cotton fibers, and at the same time, the cultivation of cotton is easily affected by the climate, which makes the supply of cotton raw materials very unstable. Therefore, it is very necessary to use chemical fiber instead of cotton fiber to produce imitation cotton knitted fabric which has the advantages of cotton and can solve the shortcomings of cotton.

At present, there are many researches on imitation cotton knitted fabrics. For example, patent document CN103898670A discloses a cotton imitation knitted fabric and a method for producing the same. By using pure polyester fiber staple fiber yarn, polyester cotton staple fiber yarn and elastic fiber, the knitted fabric is subjected to a high temperature alkali reduction process. Obtained a good soft feel and strong cotton feel, greatly improved water absorption and quick-drying, and improved the shortage of "suffocation" when wearing chemical fiber fabrics, but high temperature alkali reduction treatment will dissolve the hairiness on the surface of the fabric and reduce the fabric's Hairiness and high processing temperature require the use of caustic soda, which can not achieve the purpose of "energy saving and emission reduction", which increases the processing cost. In addition, most of the raw materials used for weaving are Short fibers will affect the breathability and breaking strength of the fabric.

Another example is disclosed in patent document CN102517775A. A jacquard air layer ultra-cotton moisture-absorbing and heat-generating knitted fabric uses at least a blended yarn formed of Porel fiber (capillary polyester fiber long fiber) and cellulose fiber, and the fibers in the blended yarn The content of plain fiber is 50% to 60%, so the knitting fabric obtained has a superior cotton-like effect and fast water absorption. However, because the used Porel fiber is a special functional fiber, the content is relatively high, which increases the production cost.

In addition, there are currently technologies for making the yarns have a certain natural fiber style by false-twisting the polyester fiber filaments. For example, patent document CN103603113A discloses a processing yarn obtained by fusing and twisting polyester fiber filaments to obtain a soft-feeling and uneven surface. The fabric produced by the processing yarn has a gravel feeling and a hollow feeling. The coefficient of variation of the length of the twist zone in the false twist direction of the thread is too small, the obtained fabric has a uniform pore area distribution, strong gloss, and does not have the appearance and feel of a cotton product; as disclosed in Patent Document Japanese Patent Application Laid-Open No. 2000-303287 The thread is fused, and the twisted portion in the false twist direction, the untwisted crimped portion, and the untwisted direction twisted portion alternately exist. The yarn surface can hardly be rough, and the gloss is reduced, which solves the cloth surface of the hemp fabric. Uniformity and rough feel, but it is difficult to control the untwisted crimped part between the twisted part in the false twist direction and the twisted part in the untwisting direction. The processing is complicated and costly, and the fabric made from it has a strong numbness. Can not have the feel and appearance comparable to cotton products.

In view of the above problems, an object of the present invention is to provide a polyester fiber filament that is simple to process, soft to the touch, and strong in natural fibers, and a cotton imitation made from the polyester fiber filament, which has superior effects and has good air permeability, breaking strength, and water absorption speed. Cotton-like knitted fabric with dryness and UV resistance.

The technical solution of the invention:

The cotton-like knitted fabric of the present invention is a weft knitted fabric woven from a woven material containing at least 45% by weight of polyester fiber filaments; the pore area distribution of the fabric is centered at 6000 to 22000 μm ² and dispersed at 2σ Above, and the coefficient of variation of the pore area is greater than 40%.

The polyester fiber filaments of the present invention are alternately formed by false twist direction twist areas and reverse twist areas, wherein the average length of the false twist direction twist areas is 0.3 cm or less, the coefficient of variation is 60% or more, and the diameter is reverse twist The diameter of the zone is 30% to 70%, and the total length of the false twist direction twist zone in the polyester fiber filament is 20.0% to 40.0% of the total length of the polyester fiber filament.

The pore area distribution of the cotton-like imitation knitted fabric of the present invention is consistent with that of cotton-containing products, and has the appearance of cotton-containing products; meanwhile, because polyester fiber filaments are used as the main raw material, it has good air permeability compared with short-fiber products (JISL1096 -2010 Standard A method: 75 to 150cm ³ / cm ² / s) and rupture strength (JISL1096-2010 standard: 700kpa or more); superior water absorption and quick-drying compared to cotton-containing products (KEKEN method: 60min The residual moisture content is less than 10%); Furthermore, because the uneven diameter of the polyester fiber filaments used in the present invention improves the diffuse reflection effect of the fabric, and the polyester fiber itself has an aromatic ring molecular structure that is resistant to ultraviolet rays, so The fabric has excellent UV resistance (Australian standard AS / NZS4399-1996: UPF value is above 45). The fabric of the present invention is particularly suitable for making T-shirts and the like. In addition, the method for processing the polyester fiber filaments of the present invention is simple, easy to handle, soft to the touch, and strong in natural fibers.

1‧‧‧ false twist direction twist zone

2‧‧‧ reverse twist zone

3‧‧‧ false twist direction twist zone

4‧‧‧Polyester pre-oriented yarn POY

5‧‧‧ First Rolla

6‧‧‧The first hot box

7‧‧‧ false twister

8‧‧‧ Moving sliver

9‧‧‧ Second Rolla

10‧‧‧Second Hot Box

11‧‧‧ Third Rolla

12‧‧‧ polyester filament

13‧‧‧ take-up tube

FIG. 1 is a side view of a polyester fiber filament of the present invention in the longitudinal direction. Of which: 1 It is a false twist direction twist area, 2 is a reverse direction twist area, and 3 is a false twist direction twist area.

FIG. 2 is a processing flowchart of the polyester fiber filament of the present invention. Among them, 4 is a polyester fiber pre-oriented yarn POY, 5 is a first roller, 6 is a first heat box, 7 is a false twister, 8 is a moving sliver, 9 is a second roller, and 10 is a second heat box , 11 is a third roller, 12 is a polyester fiber filament (textile-processed yarn DTY), and 13 is a take-up drum.

The knitted fabric of the present invention is a weft knitted fabric woven from a weaving raw material containing at least 45% by weight of polyester fiber filaments, and has a pore area distribution centered on 6000 to 22000 μm ² and dispersed over 2σ, and the pore area The coefficient of variation is greater than 40%.

Considering that polyester fiber filaments in chemical fibers are simple to process and low in cost; compared to polyester fiber staple fiber fabrics, polyester fiber filament fabrics are superior in air permeability and breaking strength, so they are used as the braid of the present invention. raw material. In addition, considering that weft-knitted tissue has better elasticity and softer comfort than other types of tissue, it is used as the knitted fabric of the present invention.

If the content of the polyester fiber filament used in the woven material of the present invention is less than 45%, the pores of the fabric will decrease, the air permeability will decrease, and the wearing comfort will be affected; moreover, the appearance of imitation cotton-containing products cannot be obtained. The distribution center of the pore area is not within 6000 to 22000 μm ² .

In the present invention, the pore area distribution of the fabric is centered at 6000 to 22000 μm ² , dispersed over 2σ, and the coefficient of variation (CV) of the pore area is greater than 40%, which is consistent with the appearance effect of cotton-containing products. When the center of the pore area distribution of the fabric is less than 6000 μm ² , it means that the pores of the fabric become smaller and tighter, and the fabric feels too hard, which results in a decrease in cotton feel. In addition, when the fabric is too tight, the fabric's breathability decreases and the elasticity decreases, greatly Reduced wearing comfort. When the center of the pore area distribution of the fabric is greater than 22000 μm ² , it means that the pores of the fabric become larger, the fabric is too loose, and it cannot meet the requirements of lumbar bone and thickness of cotton products. If the pore area is dispersed within 2σ and the coefficient of variation of the pore area of the fabric is less than 40%, it means that the pore size of the fabric is uniform, the unevenness is weak, and the gloss of the fabric is relatively strong (that is, the sense of chemical fiber is strong), which is lower than that of cotton-containing products. Gloss is contrary.

In order to make the pore distribution of the fabric closer to the cotton-containing product, the polyester fiber filament content used in the present invention is preferably 100%. The larger the polyester fiber filament content used, the more uneven the pore area distribution, and the more it can mimic the appearance and feel of cotton staple fiber fabrics. Of course, in the present invention, for example, polyester fiber staple fiber yarn, natural fiber staple fiber yarn, and the like can be interwoven with the polyester fiber filament used in the invention to achieve the effect of cotton imitation.

Preferably, the polyester fiber filaments used in the present invention are alternately formed by false twist direction twist regions and reverse direction twist regions, wherein the average length of the false twist direction twist regions is 0.3 cm or less, the length variation coefficient is 60% or more, The diameter is 30% to 70% of the diameter of the reverse twist zone, and the total length of the false twist direction twist zone in the polyester fiber filament is 20.0% to 40.0% of the total length of the polyester fiber filament. Such polyester fiber filaments not only have an appearance, but also have properties similar to cotton spinning. The false twist direction twist area refers to the untwisted portion of the yarn, and the reverse twist area refers to the untwisted portion of the yarn.

If the average length of the twisted area of the polyester fiber used in the present invention is greater than 0.3 cm in the false twist direction, the proportion of the false twisted direction twist area in the yarn length direction increases, and the yarn is relatively thinner and harder. The lumbar texture of the fabrics produced by the fabrics increased, but the touch tended to harden.

If the length variation coefficient (C.V) of the polyester fiber filament used in the present invention is less than 60%, the pore area distribution of the fabric made therefrom tends to become uniform, There may be a phenomenon that the effect of cotton imitation is weakened, and it is difficult to obtain the appearance of cotton imitation.

In the polyester fiber filament used in the present invention, the smaller the ratio of the diameter of the false twist direction twist zone to the diameter of the reverse twist zone, that is, the larger the difference between the diameter of the false twist direction twist zone and the diameter of the reverse twist zone, the larger the fabric. The more uneven the area distribution of the pores, the closer the appearance of the fabric is to cotton-containing products; however, if the ratio of the diameter of the twisted area in the false twist direction to the diameter of the reversed twist area is less than 30%, the diameter of the twisted area in the false twist direction is The diameter difference in the direction twist area is too large, which may cause the fabric to have too large pores, reduce the sense of compactness, and affect the effect of cotton imitation. If the ratio of the diameter of the false twist direction twist zone to the diameter of the reverse twist zone is greater than 70%, the difference between the diameter of the false twist direction twist zone and the diameter of the reverse twist zone is not large, which may cause the fabric's pore distribution to be too uniform. Affects the appearance of imitation cotton; in addition, it may also cause the diameter of the false twisted area in the opposite direction of the yarn to become thinner, making the fabric softer.

In addition, the smaller the ratio of the total length of the polyester fiber filaments in the false twist direction to the total length of the polyester fiber filaments used in the present invention, the better the fluffy and soft feel of the fabric can be given. If the proportion of the twisted area in the false twist direction is less than 20%, although the fluffy feeling and softness of the fabric are improved, the problem of lower back texture may occur, and the unity of the waist and softness of cotton products cannot be achieved; and If the proportion of the twist area in the false twist direction is greater than 40%, although the lumbar texture of the fabric is increased, there may be a problem that the softness is reduced, and the unity of the lumbar texture and the softness of cotton products may not be achieved.

The total fineness of the polyester fiber filaments used in the present invention is 56 to 220 dtex. When the total fineness is less than 56 dtex, the pore area of the fabric made from it becomes smaller, the pore area difference is reduced, and the thickness of the fabric is thin, there may be no appearance effect and hand feel of cotton imitation; and when the total fineness is more than 220 dtex, The pores of the obtained fabric become larger, and it may not be as dense as a cotton product, and the fabric is too thick In fact, the effect of imitation cotton is not good.

The monofilament fineness of the polyester fiber filament used in the present invention is preferably less than 1.3 dtex. If the monofilament fineness is greater than 1.3dtex, it may affect the delicate feel of the fabric and reduce the cotton-like effect.

The fabric of the present invention is obtained by weaving a single of the above-mentioned polyester fiber filaments or merging two of the above-mentioned polyester fiber filaments, and then knitting and then processing such as refining, dyeing, and shaping, so as to ensure the compactness of the fabric and the pore distribution. Unite. For example, if 56 to 100 dtex of the above-mentioned polyester fiber filaments are used, we can use two feeds for weaving; if we use 100 to 220 dtex of the above-mentioned polyester fiber filaments, we can use single feed for weaving.

In order to make the feel of the fabric more similar to that of cotton products, the cotton-like knitted fabric of the present invention is preferably obtained through a fluffing process. The equipment used for raising is not particularly limited. It can use the Italian Sperotto sander sander, with a speed of 5 to 30 m / min, a tension of 0.4 to 0.6 MPa, and a number of sand skins of 160 to 240 #.

Preferably, the bending stiffness (B) of the cotton-like knitted fabric of the present invention is 0.015 to 0.045 N‧ cm ² / cm, the surface roughness (SMD) is 3 to 6 μ, and the compression specific work (WC) is 0.2 to 0.8 N‧ cm / cm ² , these properties are consistent with the cotton T-shirt fabrics on the market. The invention solves the technical difficulty that the ordinary polyester fiber filament imitation cotton fabric has the same surface roughness as the cotton-containing product, but the bending stiffness and compression specific work cannot meet the requirements of the cotton product. Here, the bending stiffness refers to the rigidity and flexibility of the fabric, which expresses the waist-bone feel of the fabric. The larger the value, the greater the stiffness of the fabric, while the cotton products have a certain softness and lumbar feel; the surface roughness refers to the flatness of the fabric surface. Small means that the fabric feels smooth, otherwise it is rough; Compression specific power refers to the fluffy feeling of the fabric. The larger the value, the more fluffy the fabric.

The cotton-like knitted fabric of the present invention is not particularly limited in terms of the woven structure, and is To give the fabric a certain sense of compactness, a flat needle structure or an uneven structure can be used, and a flat needle structure is preferred.

The polyester fiber filament of the present invention can be prepared by the following method: the polyester fiber pre-oriented yarn POY is passed through a first roller and heated in a first hot box according to the procedure of FIG. 2, and then sequentially introduced into a false twister , The second roller, the second hot box, and the third roller to obtain a product; wherein the temperature in the first hot box is 230 to 250 ° C; and the D / Y ratio is 1.5 to 2.5. In the foregoing steps, there is no limitation on the speed, but it is preferably 300 to 500 m / min for the convenience of operation; the extension ratio is also not limited, but it is preferably 1.10 to 2.00 for the convenience of operation.

The polyester fiber pre-oriented yarn POY used in the foregoing step can be obtained by a method known in the art, for example, it can be obtained by melt spinning using a commercially available polyester fiber chip material. The speed of melt-spinning can be appropriately set, and is preferably performed at a speed of 2500 to 3500 m / min. The fineness and the number of monofilaments of the obtained polyester fiber pre-oriented yarn POY are not particularly limited, but in order to obtain polyester fiber filaments suitable for the present invention, the fineness of the polyester fiber pre-oriented yarn POY is preferably 70 to 280 dtex. The number of monofilaments is preferably 70 to 280.

In the above process, when the temperature of the first hot box is lower than 230 ° C, although the average length of the twisted area in the false twist direction can be controlled below 0.3 cm, the proportion of its total length to the total length of the polyester fiber filaments will be Less than 20%, the softness of the fabric made by it is improved, the lumbar bone feel is weakened, and the feel of cotton imitation cannot be obtained; and the diameter ratio of the false twist direction twist area to the reverse direction twist area will be less than 30%. The difference in diameter becomes larger, so that although the pore area distribution of the fabric can be made more uneven, it will also cause some pore areas in the fabric to be too large to achieve the same compactness as cotton products. If the temperature of the first hot box is higher than 250 ° C, the The average length is more than 0.3cm, and the total length of the total length of the filament will exceed 40%. Although the lumbar texture of the fabric made by it is improved, the softness is greatly reduced, and the feel of cotton-like fabric cannot be obtained. If the ratio of the diameter of the twisted area in the false twist direction to the diameter of the reversed twist area is greater than 70%, the diameter of the false twisted area in the reverse direction of the yarn becomes smaller, and the entire yarn is too stiff, which affects the cotton-like effect of the fabric (softness ).

In order to obtain the neps-like effect, the coefficient of variation (CV) of the length of the twist zone in the false twist direction of polyester fiber filaments needs to be controlled above 60%. Therefore, during processing, the D / Y ratio needs to be set to 1.5 to 2.5. The D / Y ratio here is the surface speed of the stack divided by the surface speed of 2 rollers. If the D / Y ratio is less than 1.5, the untwisting tension is too large, the twist area in the false twist direction is destroyed, and the length distribution becomes too uniform, resulting in too small a coefficient of variation (CV). When the coefficient of variation (CV) is less than 60%, the The pore area distribution of the fabrics produced by it has a tendency to become uniform, and the effect of neps-like is weakened, and the appearance of cotton-containing products may not be obtained; and if the D / Y ratio is greater than 2.5, the untwisting tension is too small, and the yarn quality Can not guarantee.

Preferably, the fineness of the polyester fiber filaments of the present invention is 56 to 220 dtex. If the fineness is less than 56dtex, that is to say, the raw material yarn used is relatively thin. During the first hot box false twisting process, the excessively thin raw material yarn may cause excessive fusion and false twisting, which makes it difficult to unravel the twisted area in the reverse direction during the untwisting process. Twist to make the diameter smaller, the diameter difference between the false twist direction twist area and the reverse twist area becomes smaller, the pore area of the fabric formed by it becomes smaller, and the difference in pore area tends to become inconspicuous, which may be difficult Obtain the appearance of cotton-containing products; in addition, it may cause the average length of the twisted area in the false twist direction to be greater than 0.3 cm, and the total length of the total length of the filaments to be greater than 40%. The silk feel will be relatively hard. Although the waist-bone feel of the fabric formed by it is improved, it is difficult to obtain a soft feel like cotton products. If the fineness is greater than 220dtex If the raw yarn used is relatively thick, in the first hot box false twisting process, the raw yarn may be too thick, which may cause insufficient fusion. In this way, the diameter of the false twist zone in the reverse direction will be relatively large. The ratio of the diameter of the false twist direction twist zone to the diameter of the reverse twist zone may be less than 30%, then the diameter difference between the two regions becomes larger, and the pore area of the fabric formed by it becomes larger, such as cotton Product-like compactness tends to decrease; in addition, it is possible to make the total length of the twisted area in the false twist direction less than 20% of the total filament length, and it is difficult for fabrics made from it to obtain lumbar bones containing cotton products sense.

Meanwhile, it is preferable that the monofilament fineness of the polyester fiber filaments of the present invention is 1.30 dtex or less. When the first hot box temperature is set to 230 to 250 ° C and the D / Y ratio is set to 1.5 to 2.5, if the monofilament fineness of the polyester fiber filament of the final product is greater than 1.30 dtex, the monofilament fineness of the raw filament is also compared. Large, the appearance of polyester fiber filaments produced under the above processing conditions is close to that of cotton yarns, and the pore distribution of fabrics made from them is similar to that of cotton-containing products, but because the monofilament is relatively high, cotton products may be included The delicate feeling is difficult to obtain.

[Example]

The test methods of the parameters involved in the present invention are as follows:

(1) The standard deviation of the pore area of the fabric and the center value of the pore area distribution

①Preparing the sample: Cut a 20cm × 20cm sample with a flat surface from the fabric; ② Take a photo of the sample's cloth under a digital microscope (KEYENCE) 50x lens. (A) Rotate the control panel. The brightness knob adjusts the brightness of the sample between 1/3 and 2/3. When less than 1/3, the exposure rate is too small, and the sample photo is too dark, and the pores on the sample cannot be identified; when it is greater than 2/3, the exposure rate is too large, and the pores on the same sample cannot be identified; (b) the lens is adjusted to 50 times , And adjust the sharpness of the sample by rotating the focus knob on the XY stage or control board to ensure that the pores on the sample are clear. When the lens magnification is too small, the appearance area of the sample pores is too small, which affects the accuracy of the next extraction of the pore area. When the lens magnification is too high, the total area of the sample photo taken is too small, and the number of pores is small, affecting the pore area. Actual distribution accuracy; (c) Save the picture, the area of the fabric presented in the picture is about 3.6 × 10 ⁷ μm ² ; ③ Use the brightness extraction in the automatic area measurement function provided by KEYENCE company VHX-2000 / Ver2.35 software Method; (a) click the automatic measurement area button; (b) select the brightness extraction method to extract the brightness area map of the sample photo; (c) select the "dark" option in the interface to get the pore map in the photo; (d) ) Adjust the threshold so that the pores of the sample are covered exactly. The range of the threshold is -80 to +80. If the threshold is too small or too large, the actual pore size of the sample is not covered. If the threshold is too small, the measured pore area is larger than the actual area. When it is too large, the measured pore area is larger than the actual area; (e) Finally, click "Next" to get the pore area data of the sample and save the data. The standard deviation σ of the pore area of the sample and the central value of the pore area distribution μ (unit: μm ² ) are recorded.

(2) Coefficient of variation

① Coefficient of variation of fabric pore area: standard deviation of pore area σ ÷ central value of pore area distribution μ × 100%. ② Coefficient of variation of the length of the twist zone of the polyester fiber filament in the false twist direction: The coefficient of variation of the length of the twist zone in the false twist direction = the standard deviation of the length of the twist zone in the false twist direction σ ÷ average value of the length of the twist zone in the false twist direction μ × 100% .

Among them, 50 cm polyester filaments were randomly selected, and then the lengths of the 20 twisted areas in the false twist direction were measured. Finally, the standard deviation σ and the average length μ were calculated (for the test method, see "(7) Polyester fiber length below" The ratio of the length of the twisted area in the false twist direction on the yarn to the total length of the polyester fiber filaments ").

(3) Bending stiffness

According to the KES FB2 method. (KES fabric style instrument is a fabric style instrument designed and manufactured by Dr. Kawabata Professor of Kyoto University, Japan, of which FB2 is a bending performance tester.)

(4) Surface roughness

According to the KES FB4 method. (KES fabric style meter is a fabric style meter designed and manufactured by Dr. Kawabata Professor of Kyoto University in Japan, of which FB4 is a friction and surface roughness tester.)

(5) Compression ratio work

According to the KES FB3 method. (KES fabric style meter is a fabric style meter designed and manufactured by Dr. Kawabata Professor of Kyoto University in Japan, of which FB3 is a compression performance and thickness tester.)

(6) The ratio of the diameter of the twist zone in the false twist direction to the diameter of the twist zone in the reverse direction on the polyester fiber filament

Five 20 cm polyester filaments of the present invention were randomly selected from the fabric. Using a digital microscope from KEYENCE, a measuring tool of KEYENCE digital system was used under a 50x lens to measure the false twist direction of each polyester filament. Zone and reverse twist zone diameter. Five sets of data were measured for each polyester filament and the average value of the ratio of each was calculated. After all five were measured, the average value of the total ratio was calculated.

(7) Proportion of the length of the twist zone in the false twist direction on the polyester fiber filament to the total length of the polyester fiber filament

Five polyester filaments of the present invention were randomly selected from the fabric and 50 cm, and each filament was tensioned at 0.1 g / D, and then EIB-E (Lawson-Hermerfeld model LAWSON) was used. -HEMPHILL) to measure the length of the twist zone in the false twist direction on the filament. Each polyester fiber filament is measured with 5 sets of data and the average length ratio of each is calculated. After the 5 are measured, the final average length ratio is calculated. .

(8) Softness of polyester filament

According to 20 people's sensory evaluation, according to the softness of the filament, it was divided into 4 grades of excellent, good, medium and poor. Among them, 15 or more people thought that the filament was soft, which was excellent, 10 to 14 people were good, 5 to 10 were medium, and less than 5 people were poor.

The present invention will be further described with reference to the following examples and comparative examples.

[Example 1]

Polyester fiber chip raw materials (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) were selected and melt-spun at a speed of 2800 m / min to obtain a polyester fiber POY with a fineness of 128 dtex and a single filament number of 144; and then The process in FIG. 2 is false twisted under the conditions of a speed of 400 m / min, a first hot box temperature of 238 ° C., an elongation ratio of 1.26, and a D / Y ratio of 1.9. The fineness is 100 dtex, the number of filaments is 144, Polyester filament with a monofilament fineness of 0.69 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist areas and reverse direction twist areas, wherein the average length of the false twist direction twist areas is 0.13 cm, the length variation coefficient (CV) is 78%, and the diameter is the reverse twist area. The diameter is 43%, and the total length of the twisted area in the false twist direction is 31.3% of the total length of the polyester fiber filament. See Table 1 for details.

[Example 2]

Polyester fiber chip material (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) was selected and melt-spun at a speed of 2800m / min to obtain a polyester fiber POY with a fineness of 252dtex and a single filament number of 278; and then The process in FIG. 2 is subjected to false twist processing under processing conditions of a speed of 400 m / min, a first hot box temperature of 238 ° C., an elongation ratio of 1.26, and a D / Y ratio of 1.9 to obtain a fineness of 200 dtex and a number of filaments of 278. Polyester filament with a monofilament fineness of 0.72 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist areas and reverse direction twist areas. The average length of the false twist direction twist areas is 0.10 cm, the length variation coefficient (CV) is 78%, and the diameter is the reverse twist area. The diameter is 40%, and the total length of the twisted area in the false twist direction is 22.0% of the total length of the polyester fiber filament. See Table 1 for details.

[Example 3]

Polyester fiber chip material (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) was selected, and melt spinning was performed at a speed of 2800m / min to obtain a polyester fiber POY with a fineness of 71 dtex and a number of single filaments of 78; and then The process shown in FIG. 2 is false-twisted under processing conditions of a speed of 400 m / min, a first hot box temperature of 238 ° C., an elongation ratio of 1.26, and a D / Y ratio of 1.9. A fineness of 56 dtex and a number of filaments of 78 are obtained. Polyester filament with a monofilament fineness of 0.72 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist areas and reverse direction twist areas. The average length of the false twist direction twist areas is 0.18 cm, the length variation coefficient (CV) is 79%, and the diameter is the reverse twist area. The diameter is 55%, and the total length of the twisted area in the false twist direction is 35.0% of the total length of the polyester fiber filament. See Table 1 for details.

[Example 4]

Polyester fiber chip raw material (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) was selected, and melt spinning was performed at a speed of 2800m / min to obtain a fineness of 128dtex, Polyester fiber POY with 144 monofilaments; then, according to the procedure of FIG. 2, the processing conditions are 400 m / min, the first hot box temperature is 232 ° C., the stretching ratio is 1.26, and the D / Y ratio is 1.9. Twisting was performed to obtain a polyester fiber filament having a fineness of 100 dtex, a number of filaments of 144, and a filament fineness of 0.69 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist areas and reverse direction twist areas. The average length of the false twist direction twist areas is 0.10 cm, the length variation coefficient (CV) is 77%, and the diameter is the reverse twist area. The total length of the 39% diameter and false twist direction twist zone is 21.0% of the total length of the polyester fiber filaments. See Table 1 for details.

[Example 5]

Polyester fiber chip raw material (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) was selected, and melt spinning was performed at a speed of 2800m / min to obtain a polyester fiber POY with a fineness of 128dtex and a number of single filaments of 144; and then according to the figure Step 2 is false twist processing under processing conditions of a speed of 400 m / min, a first hot box temperature of 245 ° C, an elongation ratio of 1.26, and a D / Y ratio of 1.9 to obtain a fineness of 100 dtex, a number of filaments of 144, Polyester filament with a monofilament fineness of 0.69 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist areas and reverse direction twist areas. The average length of the false twist direction twist areas is 0.25 cm, the length variation coefficient (CV) is 78%, and the diameter is the reverse twist area. The diameter is 54%, and the total length of the twisted area in the false twist direction is 38.0% of the total length of the polyester fiber filament. See Table 1 for details.

[Example 6]

Polyester fiber chip raw materials (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) were selected and melt-spun at a speed of 2800 m / min to obtain a polyester fiber POY with a fineness of 128 dtex and a single filament number of 144; and then The process of FIG. 2 uses a speed of 400 m / min, a first hot box temperature of 238 ° C, an extension ratio of 1.26, and a D / Y ratio of 1.6. Twisting processing was performed under the processing conditions to obtain polyester fiber filaments having a fineness of 100 dtex, a number of monofilaments of 144, and a monofilament fineness of 0.69 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist areas and reverse direction twist areas, wherein the average length of the false twist direction twist areas is 0.25 cm, the length variation coefficient (CV) is 61%, and the diameter is the reverse twist area. The total length of 56% of the diameter and the length of the twisted area in the false twist direction is 38.0% of the total length of the polyester fiber filaments. See Table 1 for details.

[Example 7]

Polyester fiber chip raw materials (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) were selected and melt-spun at a speed of 2800 m / min to obtain a polyester fiber POY with a fineness of 128 dtex and a single filament number of 144; and then The process shown in FIG. 2 is false-twisted under processing conditions of a speed of 400 m / min, a first hot box temperature of 238 ° C., an elongation ratio of 1.26, and a D / Y ratio of 2.3. The fineness is 100 dtex and the number of filaments is 144. Polyester filaments with a monofilament fineness of 0.69 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist areas and reverse direction twist areas. The average length of the false twist direction twist areas is 0.10 cm, the length variation coefficient (CV) is 90%, and the diameter is the reverse twist area. The total length of the 38% diameter and false twist direction twist zone is 21.0% of the total length of the polyester fiber filaments. See Table 1 for details.

[Example 8]

Polyester fiber chip raw materials (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) were selected and melt-spun at a speed of 2800m / min to obtain a polyester fiber POY with a fineness of 169dtex and a number of monofilaments of 96; and then The process in FIG. 2 is subjected to false twist processing under processing conditions of a speed of 400 m / min, a first hot box temperature of 238 ° C., an elongation ratio of 1.26, and a D / Y ratio of 1.9 to obtain a fineness of 134 dtex and a number of filaments of 96. Polyester filaments with a monofilament fineness of 1.40 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist regions and reverse direction twist regions. The average length of the false twist direction twist regions is 0.12 cm, the length variation coefficient (CV) is 79%, and the diameter is the reverse twist region. The diameter is 40%, and the total length of the twisted area in the false twist direction is 28.0% of the total length of the polyester fiber filament. See Table 1 for details.

[Comparative Example 1]

Polyester fiber chip material (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) was selected and melt-spun at a speed of 2800 m / min to obtain a polyester fiber POY with a fineness of 40 dtex and a number of 36 monofilaments; and then The process in FIG. 2 is subjected to false twist processing under processing conditions of a speed of 400 m / min, a first hot box temperature of 238 ° C., an elongation ratio of 1.26, and a D / Y ratio of 1.9 to obtain a fineness of 28 dtex and a number of filaments of 36. Polyester filament with a monofilament fineness of 0.78 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist areas and reverse direction twist areas. The average length of the false twist direction twist areas is 0.31 cm, the length variation coefficient (CV) is 78%, and the diameter is the reverse twist area. The total length of the twist zone in the diameter of 80% and the false twist direction is 42.0% of the total length of the polyester fiber filaments. See Table 1 for details.

[Comparative Example 2]

Polyester fiber chip raw material (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) was selected and melt-spun at a speed of 2800m / min to obtain a polyester fiber POY with a fineness of 410dtex and a number of 288 monofilaments; and then The process in FIG. 2 is subjected to false twist processing under processing conditions of a speed of 400 m / min, a first hot box temperature of 238 ° C., an elongation ratio of 1.26, and a D / Y ratio of 1.9 to obtain a fineness of 250 dtex and a number of filaments of 288. Polyester filament with a monofilament fineness of 0.87 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist regions and reverse direction twist regions, wherein the average length of the false twist direction twist regions is 0.08 cm and the length variation coefficient (C.V) is 79%, the diameter is 28% of the diameter of the reverse twist zone, and the total length of the false twist direction twist zone is 18.0% of the total length of the polyester fiber filament. See Table 1 for details.

[Comparative Example 3]

Polyester fiber chip raw materials (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) were selected and melt-spun at a speed of 2800 m / min to obtain a polyester fiber POY with a fineness of 128 dtex and a single filament number of 144; and then The process in FIG. 2 is false twisted under processing conditions of a speed of 400 m / min, a first hot box temperature of 252 ° C., an elongation ratio of 1.26, and a D / Y ratio of 1.9. A fineness of 100 dtex and a number of filaments of 144 are obtained. Polyester filaments with a monofilament fineness of 0.69 dtex.

The obtained polyester fiber false-twisted filaments are formed alternately in the false-twist direction twist zone and the reverse-direction twist zone. The average length of the false-twist direction twist zone is 0.35 cm, the length variation coefficient (CV) is 79%, and the diameter is the reverse direction. The diameter of the twist zone is 78%, and the total length of the twist zone in the false twist direction is 42.0% of the total length of the polyester fiber filament. See Table 1 for details.

[Comparative Example 4]

Polyester fiber chip raw materials (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) were selected and melt-spun at a speed of 2800 m / min to obtain a polyester fiber POY with a fineness of 128 dtex and a single filament number of 144; and then The process in FIG. 2 is subjected to false twist processing under processing conditions of a speed of 400 m / min, a first hot box temperature of 225 ° C., an elongation ratio of 1.26, and a D / Y ratio of 1.9 to obtain a fineness of 100 dtex and a number of filaments of 144. Polyester filaments with a monofilament fineness of 0.69 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist areas and reverse twist areas. The average length of the false twist direction twist areas is 0.06 cm, the length variation coefficient (CV) is 80%, and the diameter is the reverse twist area. The diameter is 26%, and the total length of the twisted area in the false twist direction is 18.0% of the total length of the polyester fiber filament. See Table 1 for details.

[Comparative Example 5]

Polyester fiber chip raw materials (made by Toray Synthetic Fiber (Nantong) Co., Ltd.) were selected and melt-spun at a speed of 2800 m / min to obtain a polyester fiber POY with a fineness of 128 dtex and a single filament number of 144; and then The process in FIG. 2 is subjected to false twist processing under processing conditions of a speed of 400 m / min, a first hot box temperature of 238 ° C., an elongation ratio of 1.26, and a D / Y ratio of 1.3 to obtain a fineness of 100 dtex and a number of filaments of 144. Polyester filaments with a monofilament fineness of 0.69 dtex.

The obtained polyester fiber filaments are alternately formed by false twist direction twist areas and reverse direction twist areas. The average length of the false twist direction twist areas is 0.38 cm, the length variation coefficient (CV) is 55%, and the diameter is the reverse twist area. 68% of the diameter and the total length of the twist zone in the false twist direction are 55.0% of the total length of the polyester fiber filaments. See Table 1 for details.

[Example 9]

55% by weight of 56 dtex-78f ordinary polyester fiber false twist processing yarn (manufactured by Toray Synthetic Fiber (Nantong) Co., Ltd.) and 45% by weight of the polyester fiber filament of Example 3 were used in a single-sided circular knitting machine. The plain fabric was knitted with a flat needle to obtain a grey fabric, and then the fabric was refined (80 ° C × 20min), dyed (98 ° C × 30min), shaped (160 ° C × 72 seconds), and fluffed to obtain the cotton-like knitted fabric of the present invention.

The pore area distribution of the obtained fabric is centered at 6000 μm ² and dispersed above 2σ. The coefficient of variation (CV) of the pore area is 41%, the bending stiffness (B) is 0.025N‧cm ² / cm, and the surface roughness (SMD) is 4.1μ, compression specific work (WC) is 0.35N‧cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Example 10]

55% by weight of 200dtex-278f ordinary polyester fiber false twist processing yarn (manufactured by Toray Synthetic Fiber (Nantong) Co., Ltd.) and 45% by weight of the polymer of Example 2 were selected. Ester fiber filaments were knitted on a single-sided circular knitting machine to obtain a grey fabric, and then refined (80 ° C × 20min), dyed (98 ° C × 30min), shaped (160 ° C × 72S), and fluffed to obtain the present invention. Cotton-knit fabric.

The pore area distribution of the obtained fabric is centered on 15000 μm ² and dispersed above 2σ. The coefficient of variation (CV) of the pore area is 47%, the bending stiffness (B) is 0.015N‧cm ² / cm, and the surface roughness (SMD) is 3.0 μ, compression specific work (WC) was 0.80N‧cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Example 11]

35% by weight of 100dtex-144f ordinary polyester fiber false twist processing yarn (manufactured by Toray Synthetic Fiber (Nantong) Co., Ltd.) and 65% by weight of the polyester fiber filament of Example 7 were used on a single-sided circular knitting machine. The plain fabric is knitted to obtain a grey fabric, which is then refined (80 ° C × 20min), dyed (98 ° C × 30min), and shaped (160 ° C × 72S) to obtain the cotton imitation knitted fabric of the present invention.

The pore area distribution of the obtained fabric is centered at 14000 μm ² and dispersed above 2σ. The coefficient of variation (CV) of the pore area is 51%, the bending stiffness (B) is 0.024N‧cm ² / cm, and the surface roughness (SMD) is 3.8 μ, compression specific work (WC) is 0.75N‧cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Example 12]

35% by weight of 100dtex-144f ordinary polyester fiber false twist processing yarn (manufactured by Toray Synthetic Fiber (Nantong) Co., Ltd.) and 65% by weight of the polyester fiber of Example 6 were used on a single-sided circular knitting machine. The plain fabric is knitted to obtain a grey fabric, which is then refined (80 ° C × 20min), dyed (98 ° C × 30min), and shaped (160 ° C × 72S) to obtain the cotton imitation knitted fabric of the present invention.

The pore area distribution of the obtained fabric is centered at 13000 μm ² and dispersed above 2σ. The coefficient of variation (CV) of the pore area is 48%, the bending stiffness (B) is 0.034N‧cm ² / cm, and the surface roughness (SMD) is 4.9 μ, compression specific work (WC) is 0.30N‧cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Example 13]

100% by weight of the polyester fiber filaments of Example 3 were used to form a grey fabric by weaving with flat needles on a single-sided circular knitting machine in the form of double yarn combining, and then refining (80 ° C × 20min) and dyeing (98 ° C × 30min), setting (160 ° C × 72S), and fuzzing to obtain the cotton-like knitted fabric of the present invention.

The pore area distribution of the obtained fabric is centered at 6900 μm ² and dispersed above 2σ, the coefficient of variation (CV) of the pore area is 58%, the bending stiffness (B) is 0.045N‧cm ² / cm, and the surface roughness (SMD) is 6.0 μ and compression specific work (WC) of 0.20 N‧cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Example 14]

100% by weight of the polyester fiber filament of Example 2 was used, and the tianzhu tissue was woven on a single-sided circular knitting machine to obtain a grey fabric, which was then refined (80 ° C × 20min), dyeed (98 ° C × 30min), and shaped (160 ° C). × 72S) and raising processing to obtain the cotton-like knitted fabric of the present invention.

The pore area distribution of the obtained fabric was centered at 22000 μm ² and dispersed above 2σ. The coefficient of variation (CV) of the pore area was 63%, the bending stiffness (B) was 0.037 N · cm ² / cm, and the surface roughness (SMD) was 5.1μ, compression specific work (WC) is 0.50N‧cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Example 15]

100% by weight of the polyester fiber filaments of Example 8 were used to knit on a single-sided circular knitting machine to obtain a grey fabric, which was then refined (80 ° C × 20min) and dyed. Color (98 ℃ × 30min), setting (160 ℃ × 72S), and fluffing process to obtain imitation cotton knitted fabric.

The pore area distribution of the obtained fabric was centered at 19000 μm ² and dispersed above 2σ. The coefficient of variation (CV) of the pore area was 64%, the bending stiffness (B) was 0.046 N · cm ² / cm, and the surface roughness (SMD) was 6.3 μ, compression specific work (WC) is 0.48N‧cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Comparative Example 6]

60% by weight of 56dtex-78f ordinary polyester fiber false twist processing yarn (manufactured by Toray Synthetic Fiber (Nantong) Co., Ltd.) and 40% by weight of the polyester fiber filament of Example 3 were selected on a single-sided circular knitting machine. Plain fabric is knitted to obtain a grey fabric, which is then refined (80 ° C × 20min), dyed (98 ° C × 30min), shaped (160 ° C × 72S), and raised to obtain a cotton-like knitted fabric.

The pore area distribution of the obtained fabric is centered at 4600 μm ² and dispersed above 2σ, the coefficient of variation (CV) of the pore area is 30%, the bending stiffness (B) is 0.012N‧cm ² / cm, and the surface roughness (SMD) is 2.1μ, compression specific work (WC) is 0.36N‧cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Comparative Example 7]

60% by weight of 200dtex-278f ordinary polyester fiber false twist processing yarn (manufactured by Toray Synthetic Fiber (Nantong) Co., Ltd.) and 40% by weight of the polyester fiber of Example 2 were used on a single-sided circular knitting machine. Plain fabric is knitted to obtain a grey fabric, which is then refined (80 ° C × 20min), dyed (98 ° C × 30min), shaped (160 ° C × 72S), and raised to obtain a cotton-like knitted fabric.

The pore area distribution of the obtained fabric is centered at 12000 μm ² and dispersed above 2σ. The coefficient of variation (CV) of the pore area is 35%, the bending stiffness (B) is 0.008N‧cm ² / cm, and the surface roughness (SMD) is 1.8 μ and compression specific work (WC) of 0.85N ‧ cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Comparative Example 8]

55% by weight of 28dtex-36f ordinary polyester fiber false twist processing yarn (manufactured by Toray Synthetic Fiber (Nantong) Co., Ltd.) and 45% by weight of polyester fiber filament of Comparative Example 1 were used on a single-sided circular knitting machine The plain fabric is knitted to obtain a grey fabric, which is then refined (80 ° C × 20min), dyed (98 ° C × 30min), and shaped (160 ° C × 72S) to obtain a cotton-like knitted fabric.

The pore area distribution of the obtained fabric was centered at 4200 μm ² and dispersed above 2σ. The coefficient of variation (CV) of the pore area was 27%, the bending stiffness (B) was 0.030 N · cm ² / cm, and the surface roughness (SMD) was 5.0 μ and compression specific work (WC) of 0.18 N · cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Comparative Example 9]

55% by weight of 250dtex-288f ordinary polyester fiber false twist processing yarn (manufactured by Toray Synthetic Fiber (Nantong) Co., Ltd.) and 45% by weight of polyester fiber filament of Comparative Example 2 were used on a single-sided circular knitting machine Plain fabric is knitted to obtain a grey fabric, which is then refined (80 ° C × 20min), dyed (98 ° C × 30min), shaped (160 ° C × 72S), and raised to obtain a cotton-like knitted fabric.

The pore area distribution of the obtained fabric was centered at 25000 μm ² and dispersed above 2σ. The coefficient of variation (CV) of the pore area was 51%, the bending stiffness (B) was 0.007N‧cm ² / cm, and the surface roughness (SMD) was 1.6 μ and compression specific work (WC) was 0.90 N‧cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

[Comparative Example 10]

100% by weight of the polyester fiber filaments of Comparative Example 6 were used to knit on a single-sided circular knitting machine to obtain a grey fabric, which was then refined (80 ° C × 20min) and dyed. Color (98 ° C × 30min), setting (160 ° C × 72 seconds), and fluffing processing to obtain imitation cotton knitted fabric.

The pore area distribution of the obtained fabric is centered at 8000 μm ² and dispersed above 2σ. The coefficient of variation (CV) of the pore area is 25%, the bending stiffness (B) is 0.050 N‧ cm ² / cm, and the surface roughness (SMD) is 7.1 μ, compression specific work (WC) is 0.15N‧cm / cm ² . The performance parameters of the obtained fabric are shown in Table 2.

Can be known from Table 1

(1) It can be seen from Example 1, Example 2 and Example 3 that the higher the total fineness, the shorter the average length of the twisted area in the false twist direction, the smaller the proportion of the filament, and the twisted direction The smaller the diameter ratio of the zone, but the coefficient of variation of length is basically unchanged.

(2) As can be seen from Example 1, Example 4, and Example 5, when the same polyester fiber POY is processed with the same false twist speed, stretch ratio, and D / Y ratio, the higher the temperature of the first hot box, The average length of the twisted region in the false twist direction of the obtained polyester fiber filament was relatively long, and the proportion of the yarn on the filament increased, which was larger than the diameter ratio of the twisted region in the reverse direction, but the length variation coefficient was close.

(3) It can be seen from Example 1, Example 6, and Example 7 that when the same polyester fiber POY is processed with the same false twist speed, the first hot box temperature, and the draw ratio, the higher the D / Y ratio, The smaller the average length of the twisted area in the false twist direction of the obtained polyester fiber filament, the smaller the proportion of the yarn on the filament, and the smaller the diameter ratio to the twisted area in the reverse direction, the larger the coefficient of variation in length and the softer the yarn.

(4) As can be seen from Example 8, when the monofilament fineness exceeds 1.3 dtex, although the yarn appearance and various performance indexes are close to those of cotton spinning, the yarn feel becomes worse.

(5) As can be seen from Comparative Example 1 and Comparative Example 2, when the total fineness of the polyester fiber filaments is too small or too large, the appearance and performance similar to that of cotton spinning cannot be obtained; too small a polyester fiber full stiff yarn may be formed. If it is too large, it will become ordinary polyester fiber false twisted yarn.

(6) It can be seen from Comparative Example 3 that when the first hot box temperature exceeds 250 ° C, the yarn is completely stiff and hard; from Comparative Example 4, it can be seen that when the first hot box temperature is lower than 230 ° C, the yarn is excessive. Fluffy, close to ordinary polyester fiber false twisted yarn.

(7) As can be seen from Comparative Example 5, when the D / Y ratio is less than 1.5, the appearance and performance similar to cotton spinning cannot be obtained, and the yarn is stiff.

From Table 2:

(1) It can be seen from Example 9 and Example 13, Example 10 and Example 14 that at the same fineness, the content of yarn 2 increases, the pore area of the fabric becomes larger, and the pore area distribution coefficient of variation becomes larger; bending The stiffness becomes larger, the surface roughness becomes larger, and the compression specific work becomes smaller, that is, the effect of cotton imitation becomes stronger.

(2) As can be seen from Example 11 and Example 12, the smaller the diameter ratio of yarn 2 and the larger the coefficient of variation of the length of the twisted area in the false twist direction, the larger the porosity of the fabric, and the larger the coefficient of variation of the pore area of the fabric. That is, the more uneven the distribution; in addition, the length of the twist zone in the false twist direction becomes shorter and the proportion becomes smaller. The softness of the fabric increases, the bending stiffness decreases, the surface roughness decreases, and the compression specific work increases, that is, the bulkiness increases.

(3) It can be seen from Example 9 and Example 10 that the larger the fineness of the yarn 2, the smaller the diameter ratio, the larger the pore area of the fabric, and the larger the coefficient of variation of the pore area, the more uneven the distribution; The shorter the average length of the zone and the smaller the proportion, the smaller the bending stiffness of the fabric, the smaller the surface roughness, and the smaller the compression specific work, that is, the larger the bulk.

(4) It can be seen from Example 15 that although the pore distribution of the fabric is close to that of cotton-containing products, since the monofilament fineness of yarn 2 exceeds 1.3 dtex, the surface roughness of the fabric is relatively large, which affects the effect of cotton imitation.

(5) As can be seen from Comparative Examples 6 and 7, when the content of yarn 2 is less than 45%, the coefficient of variation of the pore area consistent with that of the cotton-containing product cannot be obtained, and therefore the appearance of the cotton product is not provided.

(6) As can be seen from Comparative Example 8, because the used yarn 2 is a full-stiff yarn of ordinary polyester fiber, the fabric cannot obtain the same appearance as the cotton-containing product (the pore area and the coefficient of variation of the pore area are too small); and the fabric is fluffy Spend a small, cotton-free product.

(7) As can be seen from Comparative Example 9, the used yarn 2 is close to the ordinary polyester false-twisted yarn. As a result, the pore area of the fabric is too large, and the compactness of the cotton-free product is insufficient; and the bending rigidity of the fabric is insufficient, and the lumbar texture of the cotton-free product is insufficient.

(8) As can be seen from Comparative Example 10, because the used yarn 2 does not have the appearance and performance similar to that of cotton spinning, the pore distribution of the fabric is too uniform, and the appearance of the non-cotton product; and the bending stiffness is too large, the non-cotton product Soft feeling.

Claims (3)

A polyester fiber filament, characterized in that the polyester fiber filament is alternately formed by a false twist direction twist zone and a reverse direction twist zone, wherein the average length of the false twist direction twist zone is 0.3 cm or less and the length variation coefficient It is 60% or more, the diameter is 30% to 70% of the diameter of the twist zone in the reverse direction, and the length is 20.0% to 40.0% of the total length of the polyester fiber filament. The polyester fiber filament according to claim 1, wherein the polyester fiber filament has a total fineness of 56 to 220 dtex and a monofilament fineness of 1.30 dtex or less. A method for manufacturing polyester fiber filaments of claim 1 or 2, comprising the steps of: introducing a polyester fiber pre-oriented yarn into a first roller, then introducing it into a first hot box for heating, and then sequentially introducing a false twister , The second roller, the second hot box, and the third roller to obtain the polyester fiber filament; wherein the temperature in the first hot box is 230 to 250 ° C; and the D / Y ratio in the foregoing step is 1.5 to 2.5.