WO2018113767A1

WO2018113767A1 - Hollow polyester long fiber and preparation method therefor

Info

Publication number: WO2018113767A1
Application number: PCT/CN2017/117924
Authority: WO
Inventors: 倪春健; 吉宫隆之
Original assignee: 东丽纤维研究所（中国）有限公司
Priority date: 2016-12-23
Filing date: 2017-12-22
Publication date: 2018-06-28
Also published as: EP3561160A4; CN109844189A; JP7081598B2; AU2017379039A1; TW201827661A; EP3561160A1; RU2748416C2; CN108239794A; RU2019119407A; US20200017995A1; CA3047479A1; TWI793092B; JP2020502377A; KR102338025B1; PH12019501278A1; KR20190092431A; RU2019119407A3

Abstract

A hollow polyester long fiber has a cross-sectional hollowness ranging from 20.0% to 45.0%, the long fiber in natural state being of a three-dimensional crimped shape, and the radius of curvature of the crimped shape being 10.0 mm-50.0 mm. The fluffily processed tows obtained by processing the hollow polyester long fiber have high fluffiness.

Description

[Invention name established by ISA according to Rule 37.2] Polyester hollow long fiber and preparation method thereof

Technical field

The invention relates to a hollow long fiber of hollow crimped shape and a preparation method thereof, and the hollow long fiber is suitable for making long cotton for filling.

Background technique

In the textile industry, feather downs of waterfowl, such as goose down, duck down, etc., are usually filled in duvets, sleeping bags and various cold and warm products. Bird flu that has occurred worldwide has led to a sharp decline in the production of down, which has caused prices to rise. At the same time, consumers also have doubts about the safety of down. If the natural feathers are not adequately washed, it will cause bad odor. Therefore, it is necessary to remove the odor-causing dirt in advance and maintain the cleanliness of the feathers. Moreover, there is a problem that it is difficult to wash the feathers, such as feathers and feather jackets.

To this end, the industry is committed to the use of synthetic fibers instead of filling animal down. Chinese patent CN186187A discloses a short-fiber type of feather-like down-cotton, but the short-fiber-filled cotton has a low bulkiness, and the made insulating material has a grainy feeling when touched, and the short-fiber type down-filled cotton is prone to shifting when washed. . Therefore, there is an urgent need to develop a new type of filling material instead of down. Polyester fiber is easy to produce and has the advantage of low price. The development of polyester-based filling materials has a good market prospect.

Summary of the invention

It is an object of the present invention to provide a polyester hollow long fiber having a three-dimensionally crimped shape, which is suitable for use in the production of long cotton for filling, and a method for preparing the hollow long fiber of the polyester.

The polyester hollow long fiber of the present invention has a hollowness of 20.0% to 45.0% in cross section, and the polyester hollow long fiber has a three-dimensional curly shape in a natural state, and the radius of curvature of the curled shape is 10.0 mm to 50.0. Mm.

The polyester hollow long fiber of the present invention preferably has a single yarn fineness of 4.0 dtex to 15.0 dtex, and more preferably 5.0 dtex to 10.0 dtex.

The polyester hollow long fiber of the present invention has a three-dimensionally-shaped crimped shape after dry heat treatment at 160 ° C for 3 minutes, and has a radius of curvature of a curled state of 3.5 mm to 10.0 mm.

The polyester hollow long fiber of the present invention has a polymer raw material of polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate or a modified polymer thereof.

The invention also discloses a preparation method of the above-mentioned polyester hollow filament micro-micro, the dried slice is melt-extruded by a screw and then sent to a metering pump through a pipe, and the polymer accurately metered by the metering pump is sent to the spinning assembly. The spinning plate of the spinning assembly is a hollow spinning plate, the cooling distance is 10 to 150 mm, and the wind speed of the side blowing is 25 to 90m/min.

The cooling distance is preferably 60 to 110 mm; and the wind speed of the side blowing is 30 to 50 m/min.

The polyester hollow long fiber of the invention is obtained by a melt spinning process, has the advantages of simple production and low cost, and has a three-dimensional three-dimensional crimp structure, and is suitable for processing into a fluffy processed silk which can be used as a long cotton. bundle.

DRAWINGS

Figure 1 is a triangular hollow cross-sectional shape view of a polyester hollow long fiber.

2 is a view showing a quadrangular hollow cross-sectional shape of a polyester hollow long fiber.

Fig. 3 is a three-dimensional, crimped shape view of a polyester hollow long fiber in a natural state.

Figure 4 is a schematic view of the measurement of the radius of curvature.

detailed description

In order to develop a filler that can replace down, the present invention provides a polyester hollow long fiber suitable for processing into a fluffy processed tow. Since the hollow fiber has a three-dimensionally-shaped crimped structural feature, the processed fluffy processed tow also has a three-dimensional structure, so that the bulk of the fluffy tow is large, and a fluffy processed tow excellent in bulkiness can be obtained. In the fiber-forming polymer, the Young's modulus of the polyester fiber is relatively high, so that the obtained fluffy processed tow has good pressure resistance and recovery.

The three-dimensionally crimped shape means that the fiber exhibits an irregular spiral structure in the long direction ( FIG. 3 ), and at the same time, due to the difference in alignment between a part of the monofilaments, the rotation mode and direction of the monofilaments are different. Multi-dimensional three-dimensional shape.

The polyester hollow long fibers of the present invention are hollow fibers produced by a melt spinning technique. The molten polyester chips are discharged through a profiled hollow spinneret and then coiled and cooled by side blowing. In the process of melt spinning, the cooling distance is changed by adjusting the position of the side blowing, the wind speed of the side blowing, the spinning speed and the like are adjusted to control the hollowness of the hollow fiber in the range of 20.0% to 45.0%, and the curvature of the three-dimensionally curly shape. The radius is in the range of 10.0 mm to 50.0 mm. Compared with the solid fiber, the hollow fiber of the same fiber diameter has a higher bulkiness of the fluffy processed yarn obtained by using the hollow fiber, and the higher the hollowness, the more obvious the light weight. If the radius of curvature of the hollow fiber is too small, the cohesion between the filaments of the fiber is high, the fiber is not easy to be opened during the processing of the fluffy wire, and the diameter of the ring formed by the fiber is small, which affects the bulkiness of the processed tow. On the other hand, if the crimp radius of the fiber is too large, the diameter of the ring formed by the fiber after being processed into a fluffy processed tow is too large, which may weaken or fail to reflect the original three-dimensional effect of the sheath fiber, and also affect the bulkiness of the processed tow.

According to the shape of the hollow spinneret discharge hole, the difference in arrangement, and the change of production process, the obtained The cross section of the hollow fiber is also slightly different. The shape of the hollow portion has a circular shape, an approximately triangular shape, an approximately square shape, an approximately pentagon shape, and the like, and the number of holes in the hollow section is not limited to one hole.

The single-fiber fineness of the hollow polyester long fibers of the present invention is preferably from 4.0 dtex to 15.0 dtex. As the raw material fiber for the fluffy processed tow, the higher the fiber monofilament fineness, the better the rigidity of the fiber, the better the bulkiness of the resulting fluffy tow, and the better the pressure resistance and the recovery property. However, if the diameter of the monofilament fiber is too large, it is not easy to be cooled during spinning, and the uniformity of the fiber is lowered, and the fluffy tow of the finished fabric is hard. Therefore, it is more preferable that the monofilament fineness of the hollow polyester long fiber ranges from 5.0 dtex to 10.0 dtex.

The raw material of the hollow polyester long fiber of the present invention is mainly a common polyester such as polyethylene terephthalate, polytrimethylene terephthalate or polybutylene terephthalate, in order to impart fluffy processing. For the special function of silk, it is also possible to use a modified copolymer of the above polymer, such as an antibacterial and antimony-modified polymer, and the same effect as ordinary polyester can be achieved in terms of bulk properties.

Hollow polyester long fiber is one of the raw materials for making fluffy processed tow. It can be directly N combined to form fluffy processed tow and used directly as filled cotton, or it can be combined with other raw materials, such as melting point. The slightly lower fiber is made into a mixed fiber and then used as a filled long cotton; or the mixed fiber is further combined with the hollow polyester long fiber for core-sheathing and then partially melted to obtain a more excellent fluffy processed silk. The bundle is then used to fill the long cotton.

The hollow polyester long fiber of the present invention still has a three-dimensional shape after dry heat treatment at 160 ° C for 3 minutes, and the curl shape may vary due to the thermal shrinkage of the fiber, and the radius of curvature preferably ranges from 3.5 mm to 10.0 mm. In this case, even after the subsequent processing, the hollow polyester long fibers can maintain a fluffy three-dimensionally-curled shape, and are excellent in hand feeling, bulkiness, heat retention and the like.

The long-fiber polyester hollow long fiber of the present invention can be prepared by the following method, but is not limited to the method:

First, the raw material polyester chips are dried to reduce the water content of the polyester chips, improve the spinnability, and control the water content of the chips to be 50 ppm or less. The dried sections were spun by a general melt spinning method. The slice is melted by a screw or a hot plate and sent to a metering pump through a pipe. After the metering pump accurately measures, the melt polymer enters the spinning assembly, and the spinneret used in the spinning assembly is a special spinning wire for hollow fiber spinning. board. The polymer discharged from the spinneret is cooled and oiled and then taken up. In order to obtain a hollow fiber having micro-crimp, the cooling distance (the distance from the lower edge of the spinneret to the upper edge of the cooling side) in the spinning process is relatively strict, and is generally controlled within the range of 10 to 150 mm, preferably 60 to Within the range of 100mm. At the same time, in order to make the difference between the structures on both sides of the hollow fiber, the wind speed of the side blowing is also required, depending on the fiber type (total fineness and number of filaments), It is generally controlled in the range of 25 to 90 m/min, preferably 30 to 50 m/min.

When the cooling distance is less than 10 mm, the polymer discharged from the spinneret is rapidly cooled, the asymmetric effect is obvious, the radius of curvature of the obtained fiber is too small, the cohesion between the fiber monofilaments is high, and the fluffing effect is affected, and at the same time The temperature of the spinneret is easily lowered to cause fiber breakage, and the spinning property is not good; when the cooling distance is more than 150 mm, the polymer discharged from the spinneret has been uniformly cooled to some extent, even if forced cooling is performed by side blowing, The symmetry effect has also been weakened, and the radius of curvature of the fiber is too large, which also affects the fluffy effect.

When the wind speed of the side blowing is less than 25 m/min, the asymmetric cooling effect is not obvious, and the radius of curvature of the fiber is too large; when the wind speed of the side blowing is greater than 90 m/min, the asymmetric effect is more obvious, resulting in fiber. The radius of curvature is too small, and the side blowing over the assembly causes the fiber to swing a large amplitude, the spinning is unstable, and the phenomenon of floating monofilament and broken wire is prone to occur.

In order to prevent physical properties from differing between the filaments due to the difference in cooling, the arrangement of the spinneret discharge holes is preferably a "chicken" arrangement, which is often referred to as a diamond arrangement. Preferably, the spinning process mainly adopts a one-step spinning process, that is, spinning/stretching is completed simultaneously, that is, commonly known as FDY. However, it can also be obtained by a two-step process, that is, the fiber which is worthy of pre-orientation, which is commonly known as POY, and then subjected to a drawing process by an extension machine, which is commonly known as DT.

The polyester hollow long fiber of the invention has a three-dimensional crimped structure, and at the same time, the fiber monofilament is relatively thick, and the fluffy processed tow obtained by the hollow long fiber has a high exclusion volume and a high bulkiness, and has excellent properties. Compressive resistance.

The test method involved in the present invention is as follows:

(1) Test method for total fineness and monofilament fineness

The total fineness test was tested according to the JIS L 1013:2010 standard, and the single-filament fineness was calculated by the total fineness and the number of filaments.

(2) Hollow rate

The hollow long fibers are cut into thin slices (ie, fiber cross-section) in the longitudinal direction, and are photographed under a normal optical microscope to a suitable magnification, and the area S ₁ of the hollow portion and the area S _{2 of the} entire fiber are calculated according to the photograph (including the hollow portion). ), then calculate:

Hollow ratio = (S ₁ /S ₂ ) × 100%.

(3) Curvature radius test method

Curvature radius of the natural state: The yarn is curled by a ruler (for denier measurement) by 10 turns (1 m/turn), and then the sample to be tested is placed in a constant temperature and humidity environment (20 ° C × 65% RH) ( Hanging) 8h or more to make its state stable (Figure 3), then select the curved part within 20 cm below the sample for radius measurement, select After 20 measurements in different places, the average is obtained, and the obtained data is the radius of curvature. The measuring instrument is a digital microscopy system (VHX-2000C) manufactured by KEYENCE. The magnification is 20 times. The radius of curvature is measured by the calculation function of the radius of curvature in the software (Fig. 4). That is, the radius of curvature of the fiber is measured by crimping the three positions on the fiber.

Curvature radius after dry heat treatment: The yarn is passed through a ruler (for denier measurement) to curl the sample for 10 times, and then placed in a dryer for heat treatment at 160 ° C × 3 min, and then the sample is kept in a constant temperature and humidity environment. Place it for more than 4 hours, and finally select the curved part within 20 cm below to measure the radius, and select 20 different places to measure and average. The resulting data is the radius of curvature.

(4) Looseness

Test according to the IDFB method:

1 Firstly, the sample to be tested is placed in an environment of 20 ° C × 65% RH for 8 hours or more, so that the sample to be tested is stable;

2 Weigh the sample 30g, shake it to the fluffy state manually, put it into the measuring barrel and cover it;

3 Move the weight plate down to the highest point of contact with the sample, then release the weight plate to make it fall freely, release the weight plate while timing, stabilize the height for 1 minute and record;

4 Open the cover and take out the sample, shake it again to the fluffy state, put it into the lid of the measuring barrel, and measure again according to step 3, and test it 5 times in the same way;

5 Calculate the bulkiness by calculating the average height of 5 times.

The contents of the present invention are explained below by way of examples, but the present invention is not limited to the contents of the examples.

Example 1:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 25m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 300T-20f, the hollow section is triangular hollow, the hollowness is 20.0%, the single wire fineness is 15.0 dtex, and the radius of curvature before heat treatment is 50.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 10.0 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 390 inch ³ /30 g. See Table 1 for details.

Example 2:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 40m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 150T-10f, the hollow section is triangular hollow, the hollowness is 30.0%, the single wire fineness is 15.0dtex, and the radius of curvature before heat treatment is 42.0mm. After 160°C×3min dry heat treatment The radius of curvature is 8.5 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 600 inches ³ / 30g. See Table 1 for details.

Example 3:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 40m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 60T-4f, the hollow section is triangular hollow, the hollowness is 45.0%, the single wire fineness is 15.0 dtex, and the radius of curvature before heat treatment is 37.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 7.0 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested to have a bulkiness of 800 inch ³ / 30 g for the fluffy processed tow. See Table 1 for details.

Example 4:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 35m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 30.0%, the single wire fineness is 10.0 dtex, and the radius of curvature before heat treatment is 40.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 7.8 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 640 inches ³ / 30g. See Table 1 for details.

Example 5:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 50m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-20f, the hollow section is triangular hollow, the hollowness is 30.0%, the single wire fineness is 5.0dtex, and the radius of curvature before heat treatment is 35.0mm. After 160°C×3min dry heat treatment The radius of curvature is 6.5 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The tow was processed to measure the bulk of the fluffy processed tow to 610 inches ³ / 30g. See Table 1 for details.

Example 6

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 75m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 60T-15f, the hollow section is triangular hollow, the hollowness is 45.0%, the single wire fineness is 4.0dtex, and the radius of curvature before heat treatment is 10.0mm. After 160°C×3min dry heat treatment The radius of curvature is 3.5 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 480 inch ³ /30g. See Table 1 for details.

Example 7

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 70m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 65T-10f, the hollow section is triangular hollow, the hollowness is 30.0%, the single wire fineness is 6.5dtex, the radius of curvature before heat treatment is 30.0mm, after 160°C×3min dry heat treatment The radius of curvature is 6.0 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 640 inches ³ / 30g. See Table 1 for details.

Example 8

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 70m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 50T-10f, the hollow section is triangular hollow, the hollowness is 30.0%, the single wire fineness is 5.0dtex, and the radius of curvature before heat treatment is 20.0mm. After 160°C×3min dry heat treatment The radius of curvature is 4.5 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 520 inch ³ /30g. See Table 1 for details.

Example 9

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 25m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 60T-4f, the hollow section is hollow at four corners, the hollowness is 45.0%, the single fiber fineness is 15.0 dtex, and the radius of curvature before heat treatment is 42.0 mm. After 160 ° C × 3 min dry heat treatment The radius of curvature is 8.1 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the bulk of the fluffy processed tow was 760 inch ³ / 30 g. See Table 1 for details.

Example 10:

The raw material was a conventional polytrimethylene terephthalate chip (i.e., ordinary 3GT), and the polytrimethylene terephthalate was dried by a pre-crystallization dehumidifying dryer to have a water content of 30 ppm after drying. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 35m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 30.0%, the single fiber fineness is 10.0 dtex, and the radius of curvature before heat treatment is 38.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 7.5 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 630 inches ³ / 30g. See Table 1 for details.

Example 11

The raw material was a conventional polybutylene terephthalate chip (i.e., ordinary PBT), and the polybutylene terephthalate was dried by a pre-crystallization dehumidifying dryer to have a water content of 33 ppm after drying. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 35m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 30.0%, the single-filament fineness is 10.0dtex, and the radius of curvature before heat treatment is 36.0mm. After 160°C×3min dry heat treatment The radius of curvature is 7.0 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 600 inches ³ / 30g. See Table 2 for details.

Example 12

The raw material was cut with a cationically modified polyethylene terephthalate, and the cationically modified polyethylene terephthalate was dried by a precrystallization dehumidifying dryer to have a water content of 30 ppm after drying. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 35m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 33.0%, the single wire fineness is 10.0 dtex, and the radius of curvature before heat treatment is 33.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 6.4 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The tow was processed to measure the bulk of the fluffy processed tow to 610 inches ³ / 30g. See Table 2 for details.

Example 13

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 10 mm. The wind speed of the side blowing is 35m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 40.0%, the single wire fineness is 10.0 dtex, and the radius of curvature before heat treatment is 12.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 3.6 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 490 inch ³ /30g. See Table 2 for details.

Example 14

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 60 mm. The wind speed of the side blowing is 35m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 37.0%, the single wire fineness is 10.0 dtex, and the radius of curvature before heat treatment is 30.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 6.1 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 600 inches ³ / 30g. See Table 2 for details.

Example 15

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 90 mm. The wind speed of the side blowing is 35m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 32.0%, the single wire fineness is 10.0 dtex, and the radius of curvature before heat treatment is 34.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 9.5 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 720 inches ³ / 30g. See Table 2 for details.

Example 16:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 110 mm. The wind speed of the side blowing is 35m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 30.0%, the single fiber fineness is 10.0 dtex, and the radius of curvature before heat treatment is 38.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 12.5 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The tow was processed to measure the bulkiness of the fluffy processed tow to 620 inches ³ / 30g. See Table 2 for details.

Example 17

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and extruded by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 150 mm. The wind speed of the side blowing is 35m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 25.0%, the single wire fineness is 10.0 dtex, and the radius of curvature before heat treatment is 44.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 14.5 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 550 inch ³ /30g. See Table 2 for details.

Example 18

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 90m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 35.0%, the single fiber fineness is 10.0 dtex, and the radius of curvature before heat treatment is 18.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 3.9 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the bulk of the fluffy processed tow was 510 inch ³ /30g. See Table 2 for details.

Example 19

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 50m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 28.0%, the single wire fineness is 10.0 dtex, and the radius of curvature before heat treatment is 28.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 4.5 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 530 inch ³ / 30 g. See Table 2 for details.

Comparative Example 1:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and extruded by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a common round hole spinneret, and the cooling distance is 65mm, the side wind speed of 25m / min, after the DSD high-speed spinning process to produce polyester fiber. The characteristics of the fiber are as follows: the fiber type is 56T-24f, the cross section is solid round, the single wire fineness is 2.3 dtex, and there is no curling property before and after heat treatment. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The tow was processed and the fluffy processed tow was 240 inches ³ / 30g. See Table 3 for details.

Since the cross section of the fiber is solid, the obtained fiber does not have curl, and the bulkiness is small, and it is not suitable for use as a filling cotton instead of feather.

Comparative Example 2:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 90 mm. The wind speed of the side blowing is 35m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 10.0%, the single wire fineness is 10.0 dtex, and the radius of curvature before heat treatment is 40.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 10.0 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 310 inches ³ / 30g. See Table 3 for details.

Since the hollowness of the fiber is too small, although it has a radius of curvature, it is light in weight and has a small bulkiness, and is not suitable for use as a filling cotton instead of feather.

Comparative Example 3:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and extruded by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 5 mm. The wind speed of the side blowing is 35m/min, and the spinning is performed by the DSD high-speed spinning process. Since the cooling distance is too close, although spinning can be performed, the phenomenon of broken wire and floating wire is serious, and the feasibility of production is low. See Table 3 for details.

Comparative Example 4:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The side air blow speed is 110m/min, and the spinning is performed by the DSD high-speed spinning process. Since the side blower wind speed is too large, although the spinning can be performed, the fiber shake is severely caused to cause serious breakage and fluttering, and the production feasibility is low. See Table 3 for details.

Comparative Example 5:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 200 mm. The wind speed of the side blowing is 70m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 15.0%, the single wire fineness is 10.0 dtex, and the radius of curvature before heat treatment is 65.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 23.0 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 350 inches ³ / 30g. See Table 3 for details.

Since the cooling distance is too large, the radius of curvature of the obtained fiber is too large to reflect the three-dimensional effect of the fiber, resulting in small bulkiness.

Comparative Example 6:

As a raw material, a semi-dull polyester chip (T200N manufactured by Toray Fiber Synthetic Fiber Co., Ltd.) was used, and the polyester chip was dried by a pre-crystallization dehumidifying dryer, and the water content after drying was 39 ppm. The dried slice is melted and squeezed by a screw and sent to a metering pump through a pipe. The polymer accurately metered by the metering pump is sent to the spinning assembly. The spinneret of the spinning assembly is a hollow special spinneret with a cooling distance of 65 mm. The wind speed of the side blowing is 20m/min, and the hollow polyester fiber is obtained through the DSD high-speed spinning process. The characteristics of the hollow fiber are as follows: the fiber type is 100T-10f, the hollow section is triangular hollow, the hollowness is 12.0%, the single wire fineness is 10.0 dtex, and the radius of curvature before heat treatment is 55.0 mm, after 160 ° C × 3 min dry heat treatment The radius of curvature is 20.0 mm. The fiber is selected as the raw material of the sheath fiber and the core fiber, and is fed by the super feed of the sheath wire feeding speed/core wire feeding speed of 20 times, processed into a core-sheath type fluffy wire, and 6 pieces of wire are obtained, and fluffy is obtained. The processed tow was tested and the fluffy processed tow was 350 inches ³ / 30g. See Table 3 for details.

Since the side blowing wind speed is too small, the radius of curvature of the obtained fiber is too large to reflect the three-dimensional effect of the fiber, resulting in small bulkiness.

Table 1

Table 2

table 3

Claims

A polyester hollow long fiber characterized in that the long fiber has a cross-sectional hollowness of 20.0% to 45.0%, the long fiber is a three-dimensionally-curled shape in a natural state, and the radius of curvature of the curled shape is 10.0mm ~ 50.0mm.
The polyester hollow long fiber according to claim 1, wherein the long fiber has a single yarn fineness of 4.0 dtex to 15.0 dtex.
The polyester hollow long fiber according to claim 2, wherein the long fiber has a single yarn fineness of 5.0 dtex to 10.0 dtex.
The polyester hollow long fiber according to claim 1 or 2, wherein the long fiber has a radius of curvature of from 3.5 mm to 10.0 mm after dry heat treatment at 160 ° C for 3 minutes.
The polyester hollow long fiber according to claim 1 or 2, wherein the polyester is polyethylene terephthalate, polytrimethylene terephthalate or polybutylene terephthalate. Esters or their modified polymers.
A method for preparing a polyester hollow long fiber according to claim 1, characterized in that the dried slice is melt-squeezed by a screw and then transferred to a metering pump through a pipe, and the polymer accurately measured by the metering pump is conveyed to the spinning. The wire assembly, the spinneret of the spinning assembly is a hollow spinneret, the cooling distance is 10 to 150 mm, and the wind speed of the side blowing is 25 to 90 m/min.
The method for preparing a polyester hollow long fiber according to claim 6, wherein the cooling distance is 60 to 110 mm.
The method for preparing a polyester hollow long fiber according to claim 6 or 7, wherein the side blowing air velocity is 30 to 50 m/min.