CN117488419A - Preparation device and preparation method of low-pore Gao Yun micro polyester fiber - Google Patents
Preparation device and preparation method of low-pore Gao Yun micro polyester fiber Download PDFInfo
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- CN117488419A CN117488419A CN202311844818.7A CN202311844818A CN117488419A CN 117488419 A CN117488419 A CN 117488419A CN 202311844818 A CN202311844818 A CN 202311844818A CN 117488419 A CN117488419 A CN 117488419A
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- 239000000835 fiber Substances 0.000 title claims abstract description 72
- 229920000728 polyester Polymers 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 239000011148 porous material Substances 0.000 title claims description 37
- 238000001816 cooling Methods 0.000 claims abstract description 137
- 238000009987 spinning Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 16
- 238000004804 winding Methods 0.000 description 16
- 239000002184 metal Substances 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000155 melt Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000004513 sizing Methods 0.000 description 4
- 238000009736 wetting Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 229920004933 Terylene® Polymers 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Artificial Filaments (AREA)
Abstract
The utility model belongs to the technical field of cooling and molding of polyester filaments, and relates to a preparation device and a preparation method of low-hole Gao Yun micro polyester fibers, wherein the preparation device comprises a spinneret plate, spinneret holes are formed in the spinneret plate, and a cyclone airflow generating device is arranged below each spinneret hole; the cyclone airflow generating device comprises a cooling air duct, and the cooling air duct is vertically arranged and is coaxial with the corresponding spinning hole; the cyclone airflow generating device is used for forming airflow rotating around the central shaft of the cooling air duct in the cooling air duct; the preparation method adopts the preparation device. In the preparation device of the low-hole Gao Yun micro polyester fiber, cooling air provided by the cyclone airflow generating device is not directly blown to the yarn, the windward side and the leeward side are not existed when the yarn is cooled, the yarn cannot shake, and the problems of high breaking elongation CV value and low full-package rate when the low-hole micro polyester fiber is cooled are solved.
Description
Technical Field
The utility model belongs to the technical field of cooling molding of polyester filaments, and relates to a preparation device and a preparation method of low-pore Gao Yun micro polyester fibers.
Background
The utility model discloses an outer ring blowing cooling device for producing porous fine denier nylon yarns, which comprises a frame, a melting box, a spinneret plate, an oil frame and an oil nozzle, wherein a wind storage box is arranged between the melting box and the oil frame, a plurality of wind blowing cylinders are arranged on the wind storage box, the number of the wind blowing cylinders is matched with that of the spinneret plates and corresponds to that of the spinneret plates one by one, each wind blowing cylinder penetrates through the upper end surface and the lower end surface of the wind storage box, and a plurality of wind outlet holes are formed in the cylinder wall of each wind blowing cylinder, so that a cooling wind is customized for each spinneret plate, and the wind blowing cylinders are circumferentially arranged from the cylinder wall, so that tows from each spinneret plate are correspondingly surrounded to form a set of outer ring blowing equipment, and the cooling wind is uniformly blown from the outer side of the tows to the center of the annularly arranged tows, thereby achieving a good cooling effect; for example, patent CN202122606179 discloses a novel circular blowing cooling device, which comprises a spinning box body, a cold air pipe and a circular blowing box, wherein a spinneret plate is arranged at the middle position of the bottom end of the spinning box body, a silica gel sealing pad is arranged at the bottom end of the spinning box body, the circular blowing box is arranged at the bottom end of the silica gel sealing pad, an upper air chamber is arranged at the position, close to the top end, of the inside of the circular blowing box, a lower air chamber is arranged at the position, close to the bottom end, of the inside of the circular blowing box, a stainless steel candle core air cylinder is arranged at the position, below the spinneret plate, of the inside of the circular blowing box, a porous plate is sleeved on the outer surface of the stainless steel candle core air cylinder, and an air inlet pipe is arranged at the position, close to the bottom end, of the outer surface of the circular blowing box, so that the filament cooling uniformity is solved when high linear density fine denier porous fibers are manufactured, and the quality of filament finished products is improved.
The low-pore micro polyester fiber is polyester fiber with 5-12 pores and 1-1.7 dtex single filament number, has the characteristics of fine and smooth hand feeling, bright color and luster and excellent heat preservation and moisture permeability, can be applied to processing of high-grade fabrics, and has some functions of anti-pilling and excellent air permeability, and is also applied to some electronic technical fields with special technical requirements.
However, cooling of the low-hole micro-polyester fiber is a production difficulty, and no matter a side blowing device or an outer ring blowing device is adopted, a better cooling effect cannot be obtained, so that the full-package rate of the low-hole micro-polyester fiber is low, the evenness rate CV value is high, the breaking elongation CV value is high, and the requirement cannot be met; when the side blowing device is used for cooling the low-hole micro polyester fiber, the yarn has a leeward surface and cannot be uniformly cooled; the external ring blowing cooling device has better cooling effect on fine denier yarn, but the cooling effect on low-hole micro polyester fiber with smaller hole number is not good, mainly because the ring blowing cooling air cylinders are hollow cylinders, the whole yarn threads pass through the hollow parts, cooling air blows from the cylindrical outer layers to the cavities, all the yarn threads are positioned in the cavities, the cooling air directly blows to the yarn threads, the total fineness of the low-hole micro polyester fiber is lower, but the fineness of the single yarn is higher, the total fineness is low, the cooling air pressure is required to be smaller, but the fineness of the single yarn is higher, the cooling air pressure is required to be higher, when the cooling air pressure is smaller, the leeward surface (namely the cooling effect is weakened when the cooling air blows) still exists at the position of the yarn threads close to the center of the air cylinders, and because the single yarn is thicker, and the cooling is insufficient and uneven; when the cooling wind pressure is higher, because the number of the silk yarns is small, the resistance to wind is small, a large amount of cooling wind is intensively blown to the central position of the wind cylinder, turbulence is easy to generate, the disturbance to the silk yarns is large, and the broken ends of the silk yarns are more.
Disclosure of Invention
The utility model aims to solve the problem that the low-pore micro-polyester fiber is difficult to obtain a better cooling effect in the prior art, and provides a preparation device and a preparation method of the low-pore Gao Yun micro-polyester fiber.
In order to achieve the above purpose, the utility model adopts the following scheme:
the preparation device of the low-hole Gao Yun micro polyester fiber comprises a spinneret plate, wherein spinneret holes are formed in the spinneret plate, and a cyclone airflow generating device is arranged below each spinneret hole;
the cyclone airflow generating device comprises a cooling air duct, and the cooling air duct is vertically arranged and is coaxial with the corresponding spinning hole;
the cyclone airflow generating device is used for forming airflow rotating around the central shaft of the cooling air duct in the cooling air duct;
the circular blowing cooling air duct in the prior art still stays on the surface of blowing towards the yarn, even if the air duct structure is changed greatly, the cooling air is blown towards the yarn finally, but the cooling air of the cooling air duct provided by the utility model does not directly blow towards the yarn, but surrounds the yarn, takes away the temperature emitted by the yarn, and the yarn can not be blown by the cooling air to swing left and right but can still be well cooled.
As a preferable technical scheme:
according to the preparation device of the low-hole Gao Yun micro polyester fiber, the two vertical long-strip air inlet through holes are formed in the inner wall of the cooling air cylinder, the air outlet direction of the long-strip air inlet through holes is the tangential direction of the inner wall of the cooling air cylinder, and the two long-strip air inlet through holes are symmetrically distributed along the central axis of the cooling air cylinder and have opposite air outlet directions;
the cooling air respectively enters the cooling air duct from the two strip air inlet through holes along the tangential direction and flows along the inner wall of the cooling air duct to form a cooling air flow with circulation surrounding the yarn, so that the windward side and the leeward side are avoided when the yarn is cooled, the cooling purpose can be achieved by taking away the heat of the yarn, and meanwhile, the yarn shaking caused by direct blowing of the yarn by the cooling air is avoided.
The preparation device of the low-hole Gao Yun micro polyester fiber has the advantages that the length of the cooling air duct is the same as that of the long air inlet through hole.
The preparation device of the low-hole Gao Yun micro polyester fiber comprises a cyclone airflow generation device, a first air inlet plate and a second air inlet plate, wherein the cyclone airflow generation device comprises a first air inlet plate and a second air inlet plate;
a first air inlet channel is arranged in the first air inlet plate;
the first air inlet plate is fixedly connected with the cooling air cylinder, and an air outlet of the first air inlet channel is communicated with an air inlet of a long strip air inlet through hole;
the height of the first air inlet channel is equal to the length of the long air inlet through hole.
The preparation device of the low-hole Gao Yun micro polyester fiber comprises a cyclone airflow generation device, a first air inlet plate and a second air inlet plate, wherein the cyclone airflow generation device comprises a first air inlet plate and a second air inlet plate;
a second air inlet channel is arranged in the second air inlet plate;
the second air inlet plate is fixedly connected with the cooling air cylinder, and the air outlet of the second air inlet channel is communicated with the air inlet of the other long air inlet through hole;
the height of the second air inlet channel is equal to the length of the long air inlet through hole.
The preparation device of the low-hole Gao Yun micro polyester fiber comprises the cyclone airflow generation device, an inner air inlet pipe, all air inlets of the second air inlet channels are communicated with the inner air inlet pipe;
the cyclone airflow generating device is in a fan shape when overlooked, each fan blade correspondingly cools one monofilament, and air is blown simultaneously from inside to outside, so that cooling air does not directly blow to the silk, but forms circulation along the inner wall of the air duct of each fan blade, surrounds the silk, and the silk can be sufficiently cooled.
The preparation device of the low-hole Gao Yun micro polyester fiber comprises the cyclone airflow generation device, a cooling fan and a drying device, wherein the cyclone airflow generation device comprises a cyclone airflow generation device; all the air inlets of the first air inlet channels and the inner air inlet pipes are connected with the air outlet pipes of the cooling fans.
The utility model also provides a preparation method of the low-pore Gao Yun micro-polyester fiber, which adopts the preparation device of the low-pore Gao Yun micro-polyester fiber.
As a preferable technical scheme:
according to the preparation method of the low-pore Gao Yun micro polyester fiber, the linear density of the low-Kong Gaoyun micro polyester fiber is 7-10 dtex/6-8 f, the oil content is 0.42% -0.45%, the elongation at break CV value is 7.69% -9.77%, the full-roll rate is 99.25% -99.5%, and the evenness CV value is 0.64% -0.74%.
The beneficial effects are that:
according to the preparation device of the low-hole Gao Yun micro polyester fiber, cooling air of the cyclone airflow generating device is not directly blown to the yarn, the windward side and the leeward side are not existed when the yarn is cooled, the yarn cannot shake, and the problems of high breaking elongation CV value and low full-package rate when the low-hole micro polyester fiber is cooled can be solved;
according to the preparation device for the low-hole Gao Yun micro polyester fiber, the cooling air cylinder of the cyclone air flow generation device correspondingly cools one monofilament, cooling air forms circulation on the inner wall of the air cylinder, cooling is sufficiently uniform, and the problems of uneven cooling and overlarge evenness CV value of the low-hole micro polyester fiber are solved.
Drawings
FIG. 1 is a schematic perspective view of a cyclone airflow generating apparatus according to the present utility model;
FIG. 2 is a schematic top view of a cyclone airflow generator according to the present utility model, showing the direction of the arrows in the drawing, and showing the direction of the cooling air flow;
FIG. 3 is a schematic top view of the flow direction of the air duct of a prior art circular air blast cooling device, with the direction of the arrows cooling the air flow direction;
FIG. 4 is a schematic diagram of a prior art circular air cooling device in front view of the airflow direction of an air duct, wherein the direction of the arrow in the diagram is the direction of the airflow of cooling air;
wherein, 1-cooling dryer, 2-first air inlet plate, 3-first air inlet channel, 4-second air inlet plate, 5-second air inlet channel, 6-interior air inlet pipe, 7-rectangular air inlet through hole, 8-strand silk.
Detailed Description
The utility model is further described below in conjunction with the detailed description. It is to be understood that these examples are illustrative of the present utility model and are not intended to limit the scope of the present utility model. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present utility model, and such equivalents are intended to fall within the scope of the claims appended hereto.
The relevant test methods involved in the examples and comparative examples are as follows:
elongation at break CV value (unit:%): according to GB/T8960-2015 terylene drawn yarn, a Swiss USTER-IV strong stretching instrument is adopted to pull the fiber to fracture under the condition of uniform tension at a constant speed, and the fracture elongation CV value of the sample is obtained from data display;
the evenness value CV (unit:%): according to GB/T8960-2015 terylene drawn yarn, a Swiss USTER-IV type yarn evenness tester is adopted to measure, when a yarn passes through an air capacitor formed by two parallel metal plates at a detection position, the capacitance is correspondingly changed due to the change of the weight of the yarn in unit length, the change rate of the capacitance and the change of the yarn weight between the plates of the detection capacitor are in a linear relationship, and the unevenness is displayed through an automatic integrator, so that the yarn evenness of the yarn is obtained;
full roll rate (unit:%): according to the index of whether the running state is normal in the production process of polyester filament yarn or not, various devices prescribe the weight of a full-wound bobbin, and the low full-wound rate indicates that the production process of filament yarn is unstable and has more broken ends.
The melt in each of the following examples and comparative examples was PET melt, and had an intrinsic viscosity of 0.635dl/g, a carboxyl end group content of 25mol/t or less, and a diethylene glycol content of 1.005wt% or less.
Example 1
The preparation device of the low-hole Gao Yun micro polyester fiber, as shown in fig. 1 and 2, comprises a spinneret plate, wherein the spinneret plate is provided with spinneret holes, and a cyclone airflow generating device is arranged below each spinneret hole;
the cyclone airflow generating device comprises a cooling air duct 1, a first air inlet plate 2, a second air inlet plate 4, an inner air inlet pipe 6 and a cooling fan;
the cooling air duct 1 is vertically arranged and is coaxial with the corresponding spinneret hole; the inner diameter of the cooling air duct 1 is 75mm;
two vertical long-strip air inlet holes 7 are formed in the inner wall of the cooling air duct 1, and the lengths of the cooling air duct 1 and the long-strip air inlet holes 7 are the same and are 190mm;
the air outlet direction of the strip air inlet through holes 7 is the tangential direction of the inner wall of the cooling air duct 1, and the two strip air inlet through holes 7 are symmetrically distributed along the central axis of the cooling air duct 1 and have opposite air outlet directions;
as shown in fig. 1 and 2, a first air inlet plate 2 is fixedly connected with a cooling air duct 1; a first air inlet channel 3 is arranged in the first air inlet plate 2, and an air outlet of the first air inlet channel 3 is communicated with an air inlet of a strip air inlet through hole 7; the height of the first air inlet channel 3 is equal to the length of the long air inlet through hole 7;
as shown in fig. 1 and 2, the second air inlet plate 4 is fixedly connected with the cooling air duct 1; a second air inlet channel 5 is arranged in the second air inlet plate 4, and an air outlet of the second air inlet channel 5 is communicated with an air inlet of the other long air inlet through hole 7; the height of the second air inlet channel 5 is equal to the length of the long air inlet through hole 7;
all air inlets of the second air inlet channels 5 are communicated with the inner air inlet pipe 6;
all the air inlets of the first air inlet channel 3 and the inner air inlet pipe 6 are connected with the air outlet pipe of the cooling fan.
Example 2
A method for preparing a low-pore Gao Yun micro polyester fiber, which adopts a device for preparing a low-pore Gao Yun micro polyester fiber in the embodiment 1; the method comprises the following specific steps:
(1) Melt extrusion: loading metal sand and a metal filter screen with corresponding specifications into a spinning assembly, and extruding a melt from a spinneret plate through assembly filtration to form primary fibers, wherein the extrusion temperature is 295 ℃;
(2) Cooling and forming: extruding the silk from a spinneret plate, cooling and forming, wherein the cooling air temperature is set to be 22.5 ℃, the relative humidity of cooling air is 85%, and the cooling air pressure is 19Pa;
(3) And (3) beam sizing: the cooled and formed silk is subjected to bundling, oiling and wetting by an exhaust oiling device;
(4) Winding and forming: and directly feeding the tow after the oiling of the bundling into a yarn guiding winding device for winding and forming, wherein the winding speed is 2500m/min.
The linear density of the finally prepared low-pore Gao Yun micro polyester fiber was 7dtex/6f, the oil content was 0.42%, the elongation at break CV value was 7.69%, the full-package rate was 99.25% and the evenness CV value was 0.74%.
Comparative example 1
A method for preparing a low-pore micro polyester fiber, which is basically the same as that of example 2, and only differs in that: the cyclone airflow generating device was replaced with a circular air blast cooling device shown in fig. 3 and 4, the circular air blast cooling device having a height of 190mm and an inner diameter of 75mm.
The final low-pore micro polyester fiber has linear density of 7dtex/6f, oil content of 0.42wt%, elongation at break CV value of 16.66%, full-roll rate of 96.35% and evenness CV value of 1.78%.
Comparative example 1 compared with example 2, the comparative example 1 was found to have a larger elongation at break CV value and a evenness CV value, mainly because the cooling air of the circular air-blast cooling device of this comparative example was directly blown to the yarn 8 itself, and disturbance to the yarn 8 was remarkable, resulting in an increase in broken ends; meanwhile, the total fineness of the low-hole micro polyester fiber is low, and the required cooling air quantity is low, so that the cooling air pressure cannot be too large, but when the cooling air pressure is small, the single filament can be cooled and is not transparent due to the high single filament fineness, and finally the evenness CV value is increased.
Example 3
A method for preparing a low-pore Gao Yun micro polyester fiber, which adopts a device for preparing a low-pore Gao Yun micro polyester fiber in the embodiment 1; the method comprises the following specific steps:
(1) Melt extrusion: loading metal sand and a metal filter screen with corresponding specifications into a spinning assembly, and extruding a melt from a spinneret plate through assembly filtration to form primary fibers, wherein the extrusion temperature is set to 295 ℃;
(2) Cooling and forming: extruding the silk from a spinneret plate, cooling and forming, wherein the cooling air temperature is set to be 22.5 ℃, the relative humidity of cooling air is 85%, and the cooling air pressure is 22Pa;
(3) And (3) beam sizing: the cooled and formed silk is subjected to bundling, oiling and wetting by an exhaust oiling device;
(4) Winding and forming: and directly feeding the tow after the oiling of the bundling into a yarn guiding winding device for winding and forming, wherein the winding speed is 2500m/min.
The linear density of the finally prepared low-pore Gao Yun micro polyester fiber is 8dtex/6f, the oil content is 0.43%, the elongation at break CV value is 9.77%, the full-rolling rate is 99.35%, and the evenness CV value is 0.64%.
Comparative example 2
A method for preparing a low-pore micro polyester fiber, which is basically the same as that of example 3, and only differs in that: the cyclone airflow generating device was replaced with a circular air blast cooling device shown in fig. 3 and 4, the circular air blast cooling device having a height of 190mm and an inner diameter of 75mm.
The linear density of the finally prepared low-pore Gao Yun micro polyester fiber is 8dtex/6f, the oil content is 0.43%, the elongation at break CV value is 16.19%, the full-roll rate is 97.18%, and the evenness CV value is 1.78%.
Comparative example 2 compared with example 3, the comparative example 2 was found to have a larger elongation at break CV value and a evenness CV value, mainly because the cooling air of the circular air-blast cooling device of this comparative example was directly blown to the yarn 8 itself, and the yarn 8 was significantly disturbed, resulting in an increase in broken ends; meanwhile, the total fineness of the low-hole micro polyester fiber is low, and the required cooling air quantity is low, so that the cooling air pressure cannot be too large, but when the cooling air pressure is small, the single filament can be cooled and is not transparent due to the high single filament fineness, and finally the evenness CV value is increased.
Example 4
A method for preparing a low-pore Gao Yun micro polyester fiber, which adopts a device for preparing a low-pore Gao Yun micro polyester fiber in the embodiment 1; the method comprises the following specific steps:
(1) Melt extrusion: loading metal sand and a metal filter screen with corresponding specifications into a spinning assembly, and extruding a melt from a spinneret plate through assembly filtration to form primary fibers, wherein the extrusion temperature is set to 295 ℃;
(2) Cooling and forming: extruding the silk from a spinneret plate, cooling and forming, wherein the cooling air temperature is set to be 22.5 ℃, the relative humidity of cooling air is 85%, and the cooling air pressure is 25Pa;
(3) And (3) beam sizing: the cooled and formed silk is subjected to bundling, oiling and wetting by an exhaust oiling device;
(4) Winding and forming: and directly feeding the tow after the oiling of the bundling into a yarn guiding winding device for winding and forming, wherein the winding speed is 2500m/min.
The linear density of the finally prepared low-pore Gao Yun micro polyester fiber is 10dtex/8f, the oil content is 0.45%, the elongation at break CV value is 8.3%, the full-rolling rate is 99.5%, and the evenness CV value is 0.71%.
Comparative example 3
A method for preparing a low-pore micro polyester fiber, which is basically the same as that of example 4, and is only different in that: the cyclone airflow generating device was replaced with a circular air blast cooling device shown in fig. 3 and 4, the circular air blast cooling device having a height of 190mm and an inner diameter of 75mm.
The linear density of the finally prepared low-pore Gao Yun micro polyester fiber is 10dtex/8f, the oil content is 0.45%, the elongation at break CV value is 16.49%, the full-rolling rate is 97.48%, and the evenness CV value is 1.99%.
Comparative example 3 has a larger elongation at break CV value and a evenness ratio CV value than example 4, and is mainly because the cooling air of the circular air-blast cooling device of this comparative example is directly blown to the yarn 8 itself, and the yarn 8 is obviously disturbed, resulting in increased broken ends; meanwhile, the total fineness of the low-hole micro polyester fiber is low, and the required cooling air quantity is low, so that the cooling air pressure cannot be too large, but when the cooling air pressure is small, the single filament can be cooled and is not transparent due to the high single filament fineness, and finally the evenness CV value is increased.
Example 5
A method for preparing a low-pore Gao Yun micro polyester fiber, which adopts a device for preparing a low-pore Gao Yun micro polyester fiber in the embodiment 1; the method comprises the following specific steps:
(1) Melt extrusion: loading metal sand and a metal filter screen with corresponding specifications into a spinning assembly, and extruding a melt from a spinneret plate through assembly filtration to form primary fibers, wherein the extrusion temperature is set to 295 ℃;
(2) Cooling and forming: extruding the silk from a spinneret plate, cooling and forming, wherein the cooling air temperature is set to be 22.5 ℃, the relative humidity of cooling air is 85%, and the cooling air pressure is 26Pa;
(3) And (3) beam sizing: the cooled and formed silk is subjected to bundling, oiling and wetting by an exhaust oiling device;
(4) Winding and forming: and directly feeding the tow after the oiling of the bundling into a yarn guiding winding device for winding and forming, wherein the winding speed is 2500m/min.
The linear density of the finally prepared low-pore Gao Yun micro polyester fiber is 10dtex/6f, the oil content is 0.44%, the elongation at break CV value is 8.98%, the full-rolling rate is 99.47%, and the evenness CV value is 0.69%.
Comparative example 4
A method for preparing a low-pore micro polyester fiber, which is basically the same as that of example 5, and is only different in that: the cyclone airflow generating device was replaced with a circular air blast cooling device shown in fig. 3 and 4, the circular air blast cooling device having a height of 190mm and an inner diameter of 75mm.
The linear density of the finally prepared low-pore Gao Yun micro polyester fiber is 10dtex/6f, the oil content is 0.44%, the elongation at break CV value is 16.17%, the full-rolling rate is 97.98%, and the evenness CV value is 1.33%.
Comparative example 4 has a larger elongation at break CV value and a evenness ratio CV value than example 5, and is mainly because the cooling air of the circular air-blast cooling device of this comparative example is directly blown to the yarn 8 itself, and the yarn 8 is obviously disturbed, resulting in increased broken ends; meanwhile, the total fineness of the low-hole micro polyester fiber is low, and the required cooling air quantity is low, so that the cooling air pressure cannot be too large, but when the cooling air pressure is small, the single filament can be cooled and is not transparent due to the high single filament fineness, and finally the evenness CV value is increased.
Claims (9)
1. The preparation device of the low-hole Gao Yun micro polyester fiber comprises a spinneret plate, wherein spinneret holes are formed in the spinneret plate, and the preparation device is characterized in that a cyclone airflow generating device is arranged below each spinneret hole;
the cyclone airflow generating device comprises a cooling air duct, and the cooling air duct is vertically arranged and is coaxial with the corresponding spinning hole;
the cyclone airflow generating device is used for forming airflow rotating around the central shaft of the cooling air duct in the cooling air duct.
2. The preparation device of the low-hole Gao Yun micro polyester fiber as claimed in claim 1, wherein two vertical long air inlet through holes are formed in the inner wall of the cooling air duct, the air outlet direction of the long air inlet through holes is the tangential direction of the inner wall of the cooling air duct, and the two long air inlet through holes are symmetrically distributed along the central axis of the cooling air duct and have opposite air outlet directions.
3. The apparatus for producing a low-pore Gao Yun microfine polyester fiber as claimed in claim 2 wherein the cooling air duct has the same length as the long air inlet hole.
4. The apparatus for producing a low-pore Gao Yun microfine polyester fiber as claimed in claim 2 wherein said cyclone airflow generating means further comprises a first air inlet plate;
a first air inlet channel is arranged in the first air inlet plate;
the first air inlet plate is fixedly connected with the cooling air cylinder, and an air outlet of the first air inlet channel is communicated with an air inlet of a long strip air inlet through hole;
the height of the first air inlet channel is equal to the length of the long air inlet through hole.
5. The apparatus for producing a low-pore Gao Yun microfine polyester fiber as claimed in claim 4 wherein said cyclone airflow generating means further comprises a second air inlet plate;
a second air inlet channel is arranged in the second air inlet plate;
the second air inlet plate is fixedly connected with the cooling air cylinder, and the air outlet of the second air inlet channel is communicated with the air inlet of the other long air inlet through hole;
the height of the second air inlet channel is equal to the length of the long air inlet through hole.
6. The apparatus for producing a fine polyester fiber with low holes Gao Yun as claimed in claim 5, wherein the cyclone air flow generator further comprises an inner air inlet pipe, and the air inlets of all the second air inlet passages are communicated with the inner air inlet pipe.
7. The apparatus for producing a low-pore Gao Yun microfine polyester fiber as claimed in claim 6 wherein said cyclone airflow generating means further comprises a cooling fan; all the air inlets of the first air inlet channels and the inner air inlet pipes are connected with the air outlet pipes of the cooling fans.
8. A method for producing a low-pore Gao Yun microfine polyester fiber, comprising using the apparatus for producing a low-pore Gao Yun microfine polyester fiber according to any one of claims 1 to 7.
9. The method for preparing the low-pore Gao Yun micro polyester fiber according to claim 8, wherein the linear density of the low-Kong Gaoyun micro polyester fiber is 7-10 dtex/6-8 f, the oil content is 0.42% -0.45%, the breaking elongation CV value is 7.69% -9.77%, the full-roll rate is 99.25% -99.5%, and the evenness CV value is 0.64% -0.74%.
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