CN111850720A - Device for preparing double-adding and double-layer hollow fibers - Google Patents
Device for preparing double-adding and double-layer hollow fibers Download PDFInfo
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- CN111850720A CN111850720A CN202010813015.5A CN202010813015A CN111850720A CN 111850720 A CN111850720 A CN 111850720A CN 202010813015 A CN202010813015 A CN 202010813015A CN 111850720 A CN111850720 A CN 111850720A
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- 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
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
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- 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
- D01D1/00—Treatment of filament-forming or like material
- D01D1/06—Feeding liquid to the spinning head
- D01D1/065—Addition and mixing of substances to the spinning solution or to the melt; Homogenising
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- 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
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Abstract
An apparatus for making a dual-addition, dual-layer hollow fiber, comprising: the main melt pipeline is used for blending the material obtained by the online adding system and the main melt to form a blended melt; the online adding system comprises two feeding units and a dynamic mixer, wherein each feeding unit comprises a drying tower, a screw extruder, an injection pump and a plurality of injection valves, the screw extruders of the two feeding units are respectively a first screw extruder and a second screw extruder, a plurality of temperature control subareas and flange areas are arranged along the screw propelling direction, and each temperature control subarea and flange area are provided with an independent heating device; an opening which can be communicated with the second screw extruder is arranged between two adjacent temperature control subareas of the first screw extruder; and the metering spinning unit is arranged at the downstream of the dynamic mixer and comprises a metering pump, a spinning box body air cooling system, an oiling device and a winding device. The invention has the beneficial effects that: improve the stability and the heat retention property of the hollow structure of the fiber.
Description
Technical Field
The invention relates to a production device for on-line addition preparation of functional polyester fibers, in particular to a device for preparing double-addition double-layer hollow fibers.
Background
At present, most of common functional master batches are added on line by one screw, and if two master batches are added, the proportion of the two components is not accurately controlled. However, in most hollow chemical fibers, the fiber cross section is a simple circular ring, so that the phenomena of structural collapse and hollowness reduction easily occur in the processing and using processes, and the performance of the hollow chemical fibers is greatly influenced.
Aiming at the problems, the invention designs a two-in-one online adding device of two functional master batches on the basis of a terylene high-capacity melt direct spinning device, and is matched with a spinneret plate with a double-layer hollow section design, thereby realizing the aims of enhancing the section structure of the fiber, accurately controlling the adding proportion of two components and improving the functionality of the fiber. The temperature of the screw can be flexibly adjusted according to the characteristics of the added master batch, so that the two components are melted and fully mixed uniformly. The fiber section produced by the spinneret plate design is in a structure of an outer circular ring and an inner triangular ring, and a stable hollow structure can be kept in the processing and using processes.
Disclosure of Invention
The invention aims to provide a device for preparing double-additive double-layer hollow fibers, which aims to enhance the cross-sectional structure of the fibers, accurately control the additive proportion of two components and improve the functionality of the fibers.
Aiming at the problems, the invention prepares the thermal polyester fiber material by adding two thermal functional master batches in two-in-one online and adding a double-layer hollow section spinneret plate on the basis of a terylene high-capacity melt direct spinning device, thereby realizing the aims of enhancing the structure and improving the thermal property. The temperature of the screw can be flexibly adjusted according to the characteristics of the added master batch, so that the two components are melted and fully mixed uniformly. The cross section of the fiber is in a structure of an outer circular ring and an inner triangular ring, and a stable hollow structure can be kept in the processing and using processes.
An apparatus for preparing a dual-addition, dual-layer hollow fiber, comprising:
the main melt pipeline is provided with a main melt inlet and a mixed melt outlet, wherein the main melt inlet is communicated with the main melt adding equipment pipeline, and the mixed melt outlet is communicated with a discharge port pipeline of the online adding system and is used for mixing the material obtained by the online adding system and the main melt to form a mixed melt;
the online adding system comprises two feeding units and a dynamic mixer, wherein the feeding units comprise a drying tower, a screw extruder, an injection pump and an injection valve, and the screw extruders of the two feeding units are named as a first screw extruder and a second screw extruder respectively; the drying tower is respectively arranged at the feed inlets of the first screw extruder and the second screw extruder, and an injection pump and an injection valve are respectively arranged on pipelines between the first screw extruder and the main melt pipeline and between the second screw extruder and the first screw extruder and used for controlling the flow rate of feed liquid in the pipeline; the first screw extruder and the second screw extruder are respectively provided with a plurality of temperature control subareas and flange areas along the advancing direction of the screws, and each temperature control subarea and each flange area are provided with an independent heating device for controlling the temperature of the temperature control subareas and the flange areas; an opening which can be communicated with the second screw extruder is arranged between two adjacent temperature control subareas of the first screw extruder;
the metering spinning unit is arranged at the downstream of the dynamic mixer and comprises a metering pump, a spinning box air cooling system, an oiling device and a winding device, wherein the metering pump is arranged on a pipeline between the dynamic mixer and the spinning box; a discharge port of the spinning box body is provided with a spinning assembly for spraying double-layer hollow thermal polyester fibers; the air cooling system is arranged beside the spinning assembly and is used for cooling the double-layer hollow thermal polyester fibers spun by the spinning assembly; the oiling device and the winding device are sequentially arranged at the downstream of the spinning assembly and are used for oiling and winding the cooled double-layer hollow heat-preservation polyester fibers.
A plurality of spinneret orifice units distributed in a concentric circle shape are arranged on a spinneret panel of the spinneret assembly, each spinneret orifice unit is formed by a plurality of micropore structures in a rotational symmetry mode, each micropore structure comprises an outer arc section and an inner Y-shaped support, and the tail end of each inner Y-shaped support is connected to the center of the inner wall of the depression of the outer arc section and arranged along the radial direction of a base circle where the outer arc section is located; the microporous structures are spliced together to form a double-layer hollow structure with an outer ring of a circular ring and an inner ring of a regular triangle ring, a micro-gap is reserved between every two adjacent microporous structures, and the width of the micro-gap is 0.2 mm.
The outer end of the outer arc section of the microporous structure and the head end of the inner Y-shaped support at the same side are both positioned on the same radius of the base circle where the outer arc section is positioned.
The spinneret orifice unit is formed by three micropore structures in a rotational symmetry mode, and the rotation angle is 120 degrees.
The first screw extruder and the second screw extruder are respectively provided with 6 temperature control subareas along the advancing direction of the screws, namely a first area, a fifth area and a flange area, and the temperature of the first area and the temperature of the second area are 290-305 ℃; the temperature of the three area and the four area is 285-295 ℃; the temperature of the fifth zone and the flange zone is 280-290 ℃, so that the screws of the first screw extruder and the second screw extruder push the materials in the first screw extruder and the second screw extruder to sequentially pass through the first zone, the second zone, …, the fifth zone and the flange zone under the driving of respective screw motors, and the heating at different temperatures is realized.
The first screw extruder had openings between the second zone and the third zone.
The method for preparing the double-layer hollow thermal polyester fiber by using the device is characterized by comprising the following steps of:
1) on a terylene melt direct spinning pipeline, a main melt pipeline is reformed in front of a metering pump and a spinning box body, an online adding system consisting of two feeding units and a dynamic mixer is additionally arranged, each feeding unit comprises a drying tower, a screw extruder, an injection pump and an injection valve, wherein the screw extruders of the two feeding units are respectively named as a first screw extruder and a second screw extruder;
2) respectively drying the two additive master batches by the drying tower in the step 1), and respectively feeding the two additive master batches into a first screw extruder and a second screw extruder;
3) the material extruded by the second screw extruder is metered by a downstream injection pump and then injected into the opening of the first screw extruder, and then is premixed, compressed and metered by the first screw extruder and then injected into the main melt pipeline, and then is fully mixed with the main melt by a dynamic mixer to obtain a blended melt;
4) conveying the blended melt obtained in the step 3) to a spinning assembly through a metering pump and a spinning box to spray filaments; controlling parameters of the two injection pumps and the spinning metering pump to achieve the purpose of adjusting the adding proportion;
5) cooling and oiling the filaments obtained in the step 4), and winding and forming to obtain the double-layer hollow thermal polyester fiber.
Wherein: the purpose of steps 1) to 3) is to prepare a blended melt with a warm-keeping function; the purpose of steps 4) to 5) is to prepare the double-layer hollow thermal polyester fiber.
The two kinds of additive master batches in the step 3) are respectively a master batch A and a master batch B, wherein:
master batch A: is aerogel master batch, the particle size of the aerogel component is 15-30 μm, and the aerogel component is added from a first screw extruder;
master batch B: is a master batch with far infrared function, the grain diameter of the far infrared ceramic powder is 1-8 μm, and the far infrared ceramic powder is added from a first screw extruder.
The mass fraction of aerogel components contained in the aerogel master batch is 0.5-1.5%; the far infrared ceramic powder contained in the far infrared functional master batch has the mass fraction of 0.5-2 percent and the total mass fraction of the two components is 1-3 percent.
The double-layer hollow thermal polyester fiber is characterized in that the outer contour of the axial cross section of the polyester fiber is circular, a plurality of arc-shaped hollow structures are arranged along the circumferential direction, and the centers of the arc-shaped hollow structures are positioned on the same base circle; the center of the axial cross section of the polyester fiber is provided with a hollow area of a regular polygon.
The axial cross section of the polyester fiber is provided with 3 arc-shaped hollow structures along the circumferential direction, and the 3 arc-shaped hollow structures are arranged at equal intervals.
The hollow-out area is of a regular triangle hollow structure.
The arc-shaped hollow structure is an arc-shaped strip-shaped structure which is circumferentially arranged along the axial cross section of the polyester fiber.
The invention has the beneficial effects that: the temperature of each temperature zone can be adjusted according to the characteristics of the added master batch, and the adding proportion of the two adding components can be controlled by adjusting the parameters of the pump; the produced fiber has a more stable hollow structure than the conventional hollow fiber because the cross section has a regular triangle shape. The novel double-component online adding technology connected by two screw extruders and the spinneret plate designed by a double-layer hollow spinneret orifice are utilized to improve the stability and the heat preservation performance of the hollow structure of the fiber. The double-layer hollow thermal polyester fiber prepared by the invention has good physical indexes, can keep the section structure and the hollowness as much as possible in the processing and using processes, meets the requirements of people on light and thermal fibers, and has excellent development prospect.
Drawings
FIG. 1a is a block diagram of the present invention;
FIG. 1b is a block diagram of the metering spinning cell of the present invention;
FIG. 2 is a cross-sectional view of the spinneret orifice unit of the present invention;
FIG. 3 is a cross-sectional view of a double-layer hollow thermal polyester fiber of the present invention;
wherein, 1 is a main melt pipeline; 2 is a drying tower; 3 is a first screw extruder; 4 is a second screw extruder; 5 is an injection pump; 6 is an injection valve; 7, an air cooling system; 8, an oiling device; 9 is a winding device; 10 is polyester fiber; 11 is an arc hollow structure; 12 is a hollow-out area; a is a region; b is a second zone; c is a third area; d is four areas; e is five regions; f is a flange area; j is a screw motor; k is a dynamic mixer.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
With reference to the accompanying drawings:
example 1 an apparatus for making a dual-addition, dual-layer hollow fiber according to the present invention comprises:
the main melt pipeline 1 is provided with a main melt inlet and a mixed melt outlet, wherein the main melt inlet is communicated with a main melt adding equipment pipeline, and the mixed melt outlet is communicated with a discharge port pipeline of the online adding system and is used for mixing a material obtained by the online adding system and the main melt to form a mixed melt;
the online adding system comprises two feeding units and a dynamic mixer, wherein the feeding units comprise a drying tower 2, a screw extruder, an injection pump 5 and an injection valve 6, and the screw extruders of the two feeding units are respectively named as a first screw extruder 3 and a second screw extruder 4; the drying tower is respectively arranged at the feed inlets of the first screw extruder and the second screw extruder, and an injection pump and an injection valve are respectively arranged on pipelines between the first screw extruder and the main melt pipeline and between the second screw extruder and the first screw extruder and used for controlling the flow rate of feed liquid in the pipeline; the first screw extruder and the second screw extruder are respectively provided with a plurality of temperature control subareas and flange areas along the advancing direction of the screws, and each temperature control subarea and each flange area are provided with an independent heating device for controlling the temperature of the temperature control subareas and the flange areas; an opening which can be communicated with the second screw extruder is arranged between two adjacent temperature control subareas of the first screw extruder;
the metering spinning unit is arranged at the downstream of the dynamic mixer and comprises a metering pump, a spinning box air cooling system, an oiling device and a winding device, wherein the metering pump is arranged on a pipeline between the dynamic mixer and the spinning box; a discharge port of the spinning box body is provided with a spinning assembly for spraying double-layer hollow thermal polyester fibers; the air cooling system is arranged beside the spinning assembly and is used for cooling the double-layer hollow thermal polyester fibers spun by the spinning assembly; the oiling device and the winding device are sequentially arranged at the downstream of the spinning assembly and are used for oiling and winding the cooled double-layer hollow heat-preservation polyester fibers.
A plurality of spinneret orifice units distributed in a concentric circle shape are arranged on a spinneret panel of the spinneret assembly, each spinneret orifice unit is formed by a plurality of micropore structures in a rotational symmetry mode, each micropore structure comprises an outer arc section and an inner Y-shaped support, and the tail end of each inner Y-shaped support is connected to the center of the inner wall of the depression of the outer arc section and arranged along the radial direction of a base circle where the outer arc section is located; the microporous structures are spliced together to form a double-layer hollow structure with an outer ring of a circular ring and an inner ring of a regular triangle ring, a micro-gap is reserved between every two adjacent microporous structures, and the width of the micro-gap is 0.2 mm.
The outer end of the outer arc section of the microporous structure and the head end of the inner Y-shaped support at the same side are both positioned on the same radius of the base circle where the outer arc section is positioned.
The spinneret orifice unit is formed by three micropore structures in a rotational symmetry mode, and the rotation angle is 120 degrees.
The first screw extruder and the second screw extruder are respectively provided with 6 temperature control subareas along the advancing direction of the screws, namely a first area, a fifth area and a flange area, and the temperature of the first area A and the temperature of the second area B are 290-305 ℃; the temperature of the three areas C and the four areas D is 285-295 ℃; the temperature of the fifth zone E and the temperature of the flange zone F are 280-290 ℃, so that the screws of the first screw extruder and the second screw extruder push the materials in the first screw extruder and the second screw extruder to sequentially pass through the first zone, the second zone, …, the fifth zone and the flange zone under the driving of respective screw motors J, and heating at different temperatures is realized.
The first screw extruder 3 has openings between the second zone and the third zone.
Two kinds of mother particles, mother particle A and mother particle B, with effective component content of 20% and density of rhoA＝1.1g/cm3、ρBThe density of the mixed melt finally used for spinning can be approximated to that of a normal polyester melt by 1.2g/cm3, a syringe pump specification adapted to the first screw extruder of 10cc/r, a syringe pump specification adapted to the second screw extruder of 10cc/r, a spinning metering pump specification of 1.8cc/r, 10-head spinning because of the small addition amount, 1.3g/cm 3. The preparation method is used for producing the double-layer hollow fiber containing A, B two effective components, the specification of each of which is 1 percent is 100dtex/36F, the spinning speed is 2500m/min, two kinds of master batches A, B which need to be added are respectively dried and then conveyed into a first screw extruder and a second screw extruder, and a material B is extruded by the second screw extruder and then metered by an injection pump connected with the second screw extruder and injected into an opening of the first screw extruder. The parameters are set as follows:
the temperature of the first screw extruder is set to be 290 ℃ in the first zone, 293 ℃ in the second zone, 291 ℃ in the third zone, 290 ℃ in the fourth zone, 288 ℃ in the fifth zone and 286 ℃ in the flange zone.
The temperature of the second screw extruder is set to 290 ℃ in the first zone, 295 ℃ in the second zone, 293 ℃ in the third zone, 292 ℃ in the fourth zone, 290 ℃ in the fifth zone and 288 ℃ in the flange zone.
The drying temperature of the drying tower is set to 150 ℃, so that the drying effect of master batches is ensured
The rotational speed of the injection pump connected to the second screw extruder was set as:
the rotational speed of the injection pump connected to the first screw extruder was set as:
the rotating speed of each spinning metering pump is set as follows:
the variation of melt density caused by melt mixing and loss can be used for fine adjustment and calibration of parameters according to the fiber index of actual production.
Adopting 36 holes, wherein the spinneret holes are double-layer hollow jet plates, and the pressure of the assembly is adjusted to 150 Bar; a long air duct circular blowing process is adopted to ensure the cooling and shaping effects; after oiling and winding, the double-layer hollow fiber with 100dtex/36F and A, B double addition can be produced.
Example 3 the apparatus for preparing a dual-additive, dual-layer hollow fiber according to this example comprises a two-component on-line addition system installed on the melt direct spinning pipeline in front of the spinning manifold and the metering pump, and a spinning winding apparatus including a spinneret with a dual-layer hollow nozzle design, wherein the two-component on-line addition system is added for 10 spinning positions at the same time.
Two kinds of mother particles A, B with 30% of effective component and rho densityA＝1.3g/cm3、ρB＝1.2g/cm3The density of the mixed melt finally used for spinning can be approximate to that of the common polyester melt and is 1.2g/cm due to the small addition amount3The specification of an injection pump connected with the first screw extruder is 10cc/r, the specification of an injection pump connected with the second screw extruder is 10cc/r, the specification of a spinning metering pump is 1.8cc/r, and 10-head spinning is carried out. The preparation method is used for producing the double-layer hollow fiber containing A, B two effective components, the specification of each of which is 1 percent is 125dtex/36F, the spinning speed is 2680m/min, two kinds of master batches A, B which need to be added are respectively dried and then conveyed into a first screw extruder and a second screw extruder, and a material B is extruded by the second screw extruder and then metered by an injection pump connected with the second screw extruder and injected into an opening of the first screw extruder. The parameters are set as follows:
the screw temperature zones of the first screw extruder are set to be 290 ℃ in the first zone, 293 ℃ in the second zone, 291 ℃ in the third zone, 289 ℃ in the fourth zone, 288 ℃ in the fifth zone and 286 ℃ in the flange zone.
The screw temperature zones of the second screw extruder are set to be 290 ℃ in the first zone, 295 ℃ in the second zone, 293 ℃ in the third zone, 292 ℃ in the fourth zone, 292 ℃ in the fifth zone and 291 ℃ in the flange zone.
The drying temperature of the drying tower is set to 150 ℃, so that the drying effect of master batches is ensured
The rotational speed of the injection pump connected to the second screw extruder was set as:
the rotational speed of the injection pump connected to the first screw extruder was set as:
the rotating speed of each spinning metering pump is set as follows:
the variation of melt density caused by melt mixing and loss can be used for fine adjustment and calibration of parameters according to the fiber index of actual production.
Adopting 36 holes, wherein the spinneret holes are double-layer hollow jet plates, and the pressure of the assembly is adjusted to 160 Bar; a long air duct circular blowing process is adopted to ensure the cooling and shaping effects; after oiling and winding, the double-layer hollow fiber with the addition of 125dtex/36F and A, B of 1 percent can be produced.
Embodiment 4 the preparation method of the double-layer hollow thermal polyester fiber provided by the invention comprises the following steps:
1) on a terylene melt direct spinning pipeline, a main melt pipeline is reformed in front of a metering pump and a spinning box body, an online adding system consisting of two feeding units and a dynamic mixer is additionally arranged, each feeding unit comprises a drying tower, a screw extruder, an injection pump and an injection valve, wherein the screw extruders of the two feeding units are respectively named as a first screw extruder and a second screw extruder;
2) respectively drying the two additive master batches by the drying tower in the step 1), and respectively feeding the two additive master batches into a first screw extruder and a second screw extruder;
3) the material extruded by the second screw extruder is metered by a downstream injection pump and then injected into the opening of the first screw extruder, and then is premixed, compressed and metered by the first screw extruder and then injected into the main melt pipeline, and then is fully mixed with the main melt by a dynamic mixer to obtain a blended melt;
4) conveying the blended melt obtained in the step 3) to a spinning assembly through a metering pump and a spinning box to spray filaments; according to the fiber specification, the winding speed and the addition requirement, the parameters of the two injection pumps and the metering pump can be adjusted to achieve the purpose of controlling the addition proportion;
5) cooling and oiling the filaments obtained in the step 4) by circular blowing of a wind cylinder with the length of 250mm, and winding and forming at the speed of 2500-2900 m/min to obtain the double-layer hollow thermal polyester fiber.
Wherein: the purpose of steps 1) to 3) is to prepare a blended melt with a warm-keeping function; the purpose of steps 4) to 5) is to prepare the double-layer hollow thermal polyester fiber.
The two kinds of additive master batches in the step 3) are respectively a master batch A and a master batch B, wherein:
master batch A: is aerogel master batch, the particle size of the aerogel component is 15-30 μm, and the aerogel component is added from a first screw extruder;
master batch B: is a master batch with far infrared function, the grain diameter of the far infrared ceramic powder is 1-8 μm, and the far infrared ceramic powder is added from a first screw extruder.
The mass fraction of aerogel components contained in the aerogel master batch is 0.5-1.5%; the far infrared ceramic powder contained in the far infrared functional master batch has the mass fraction of 0.5-2 percent and the total mass fraction of the two components is 1-3 percent.
Embodiment 5 the preparation method of the double-layer hollow thermal fiber according to this embodiment includes the following steps:
the method comprises the steps that a melt pipeline is modified in front of a metering pump and a spinning box on a polyester melt direct spinning pipeline, and an online adding system is additionally arranged, wherein the online adding system comprises two screw extruders (hereinafter referred to as a first screw extruder and a second screw extruder), two drying towers (respectively corresponding to the first screw extruder and the second screw extruder), two injection pumps (respectively corresponding to the first screw extruder and the second screw extruder), a dynamic mixer and two injection valves (respectively corresponding to the first screw extruder and the second screw extruder);
placing the master batch A in a corresponding drying tower for drying until the moisture content is below 0.03%, then feeding the master batch A into a first screw extruder, and controlling the temperature of screws in a first zone 290 ℃, a second zone 293 ℃, a third zone 291 ℃, a fourth zone 290 ℃, a fifth zone 288 ℃ and a flange zone 286 ℃ in a subarea;
placing the master batch B in a corresponding drying tower for drying until the moisture content reaches below 0.03%, and then feeding the master batch B into a second screw extruder, wherein the screw temperature is controlled in a partition mode as follows: 290 ℃ in the first zone, 295 ℃ in the second zone, 293 ℃ in the third zone, 292 ℃ in the fourth zone, 290 ℃ in the fifth zone and 288 ℃ in the flange zone;
and the material extruded by the screw of the screw motor of the second screw extruder is driven by the screw motor of the second screw extruder to be metered by the injection pump and then is injected from the opening between the two and three divisions of the first screw extruder, and is premixed with the master batch A in the first screw extruder, compressed and metered by the injection pump to be injected into the main melt pipeline, and is mixed with the polyester melt at the dynamic mixer to obtain the thermal-insulation functional melt.
The obtained thermal-insulation functional melt is metered by a metering pump and then is sprayed out of a double-layer hollow spinneret plate through a spinning box; the temperature of the spinning box body is 275-295 ℃; the spinneret plate is characterized in that: the spinneret orifice units (figure 2) are distributed on the spinneret plate surface in a concentric circle shape, each spinneret orifice unit is formed by three micropores in a rotational symmetry mode, the rotation angle is 120 degrees, a double-layer hollow structure with an outer ring being a circular ring and an inner ring being a regular triangular ring is formed, and the width of each micro slit is 0.2 mm. The pressure of the assembly is 130-180 Bar.
The parameters of the two injection pumps and the metering pump are adjusted to control the adding proportion, so that the aerogel component accounts for 1 wt% of the fiber, and the far infrared ceramic powder accounts for 2 wt% of the fiber.
After the thermal-insulation functional melt is sprayed out by a spinneret plate, the melt is cooled by circular blowing with a long air duct of 250mm, and after oiling and networking, the melt is wound and molded at the speed of 2500-2900 m/min to obtain the double-layer hollow thermal-insulation polyester fiber.
Example 6 the double-layer hollow thermal polyester fiber prepared by the preparation method of example 5 has a monofilament linear density of 2.5 to 4.0 dtex; under the environment of 25 ℃, the breaking strength is more than or equal to 2.2cN/dtex, the elongation at break is 125 +/-4%, the yarn unevenness is less than or equal to 2.0%, the oil content is 0.3-0.5%, and the heat conductivity coefficient lambda is less than or equal to 0.04W/m.K; the hollowness of the POY is 16-17%, the hollowness of the DTY after texturing is 15-16%, and the reduction rate of the hollowness is less than or equal to 6.1%.
on a terylene melt direct spinning pipeline, a main melt pipeline is reformed in front of a metering pump and a spinning box body, and an online adding system is additionally arranged, wherein the online adding system comprises two screw extruders (hereinafter referred to as a first screw extruder and a second screw extruder), two drying towers, two injection pumps, a dynamic mixer and a plurality of valves;
drying the master batch A until the moisture content is below 0.03%, feeding the master batch into a first screw extruder, and controlling the temperature of a screw in a first zone of 292 ℃, a second zone of 295 ℃, a third zone of 292 ℃, a fourth zone of 289 ℃, a fifth zone of 287 ℃ and a flange zone of 285 ℃;
drying the master batch B until the water content reaches below 0.03%, then feeding the master batch into a machine No. two, and controlling the temperature of a screw in a partition mode as follows: 290 ℃ in the first zone, 295 ℃ in the second zone, 293 ℃ in the third zone, 292 ℃ in the fourth zone, 290 ℃ in the fifth zone and 288 ℃ in the flange zone;
and the material extruded by the second screw extruder is metered by an injection pump and then injected from the opening between the second and third partitions of the first screw extruder, is premixed with the master batch A in the first screw extruder, is compressed, is metered by the injection pump and is injected into a melt pipe, and is mixed with the polyester melt at a dynamic mixer to obtain the thermal-insulation functional melt.
The obtained thermal-insulation functional melt is metered by a metering pump and then is sprayed out of a double-layer hollow spinneret plate through a spinning box; the temperature of the box body is 275-295 ℃; the spinneret plate is characterized in that: the spinneret orifice units (figure 2) are distributed on the spinneret plate surface in a concentric circle shape, each spinneret orifice unit is formed by three micropores in a rotational symmetry mode, the rotation angle is 120 degrees, a double-layer hollow structure with an outer ring being a circular ring and an inner ring being a regular triangular ring is formed, and the width of each micro slit is 0.2 mm. The pressure of the assembly is 130-180 Bar.
The parameters of the two injection pumps and the spinning metering pump are adjusted to control the adding proportion, so that the aerogel component accounts for 0.8 wt% of the fiber, and the far infrared ceramic powder accounts for 1.8 wt% of the fiber.
After the thermal-insulation functional melt is sprayed out by a spinneret plate, the melt is cooled by circular blowing with a long air duct of 250mm, and after oiling and networking, the melt is wound and molded at the speed of 2500-2900 m/min to obtain the double-layer hollow thermal-insulation polyester fiber.
Embodiment 8 a double-layer hollow thermal polyester fiber prepared by the preparation method of embodiment 7, the monofilament linear density of which is 2.0 to 3.5 dtex; under the environment of 25 ℃, the breaking strength is more than or equal to 2.0cN/dtex, the elongation at break is 123 +/-4%, the yarn unevenness is less than or equal to 2.0%, the oil content is 0.3-0.5%, and the heat conductivity coefficient lambda is less than or equal to 0.04W/m.K; the hollowness of the POY is 16-17%, the hollowness of the DTY after texturing is 15-16%, and the reduction rate of the hollowness is less than or equal to 6.1%.
Embodiment 9 the double-layer hollow thermal polyester fiber according to this embodiment, an outer contour of an axial cross section of the polyester fiber is circular, and a plurality of arc-shaped hollow structures are arranged along a circumferential direction, the arc-shaped hollow structures are arranged along the circumferential direction of the polyester fiber, and centers of the arc-shaped hollow structures are located on the same base circle; the center of the axial cross section of the polyester fiber is provided with a hollow area of a regular polygon.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but includes equivalent technical means as would be recognized by those skilled in the art based on the inventive concept.
Claims (6)
1. An apparatus for preparing a dual-addition, dual-layer hollow fiber, comprising:
the main melt pipeline is provided with a main melt inlet and a mixed melt outlet, wherein the main melt inlet is communicated with the main melt adding equipment pipeline, and the mixed melt outlet is communicated with a discharge port pipeline of the online adding system and is used for mixing the material obtained by the online adding system and the main melt to form a mixed melt;
the online adding system comprises two feeding units and a dynamic mixer, wherein the feeding units comprise a drying tower, a screw extruder, an injection pump and a plurality of injection valves, and the screw extruders of the two feeding units are named as a first screw extruder and a second screw extruder respectively; the drying tower is respectively arranged at the feed inlets of the first screw extruder and the second screw extruder, and an injection pump and an injection valve are respectively arranged on pipelines between the first screw extruder and the main melt pipeline and between the second screw extruder and the first screw extruder and used for controlling the flow rate of feed liquid in the pipeline; the first screw extruder and the second screw extruder are respectively provided with a plurality of temperature control subareas and flange areas along the advancing direction of the screws, and each temperature control subarea and each flange area are provided with an independent heating device for controlling the temperature of the temperature control subareas and the flange areas; an opening which can be communicated with the second screw extruder is arranged between two adjacent temperature control subareas of the first screw extruder;
the metering spinning unit is arranged at the downstream of the dynamic mixer and comprises a metering pump, a spinning box air cooling system, an oiling device and a winding device, wherein the metering pump is arranged on a pipeline between the dynamic mixer and the spinning box; a discharge port of the spinning box body is provided with a spinning assembly for spraying double-layer hollow thermal polyester fibers; the air cooling system is arranged beside the spinning assembly and is used for cooling the double-layer hollow thermal polyester fibers spun by the spinning assembly; the oiling device and the winding device are sequentially arranged at the downstream of the spinning assembly and are used for oiling and winding the cooled double-layer hollow heat-preservation polyester fibers.
2. An apparatus for making a double-fed, double-layer hollow fiber according to claim 1, wherein: a plurality of spinneret orifice units distributed in a concentric circle shape are arranged on a spinneret panel of the spinneret assembly, each spinneret orifice unit is formed by a plurality of micropore structures in a rotational symmetry mode, each micropore structure comprises an outer arc section and an inner Y-shaped support, and the tail end of each inner Y-shaped support is connected to the center of the inner wall of the depression of the outer arc section and arranged along the radial direction of a base circle where the outer arc section is located; the microporous structures are spliced together to form a double-layer hollow structure with an outer ring of a circular ring and an inner ring of a regular triangle ring, a micro-gap is reserved between every two adjacent microporous structures, and the width of the micro-gap is 0.2 mm.
3. An apparatus for making a double-fed, double-layer hollow fiber according to claim 2, wherein: the outer end of the outer arc section of the microporous structure and the head end of the inner Y-shaped support at the same side are both positioned on the same radius of the base circle where the outer arc section is positioned.
4. An apparatus for making a double-fed, double-layer hollow fiber according to claim 2, wherein: the spinneret orifice unit is formed by three micropore structures in a rotational symmetry mode, and the rotation angle is 120 degrees.
5. An apparatus for making a double-fed, double-layer hollow fiber according to claim 1, wherein: the first screw extruder and the second screw extruder are respectively provided with 6 temperature control subareas along the advancing direction of the screws, namely a first area, a fifth area and a flange area, and the temperature of the first area and the temperature of the second area are 290-305 ℃; the temperature of the three area and the four area is 285-295 ℃; the temperature of the fifth zone and the flange zone is 280-290 ℃, so that the screws of the first screw extruder and the second screw extruder push the materials in the first screw extruder and the second screw extruder to sequentially pass through the first zone, the second zone, …, the fifth zone and the flange zone under the driving of respective screw motors, and the heating at different temperatures is realized.
6. An apparatus for making a double-fed, double-layer hollow fiber according to claim 5, wherein: the first screw extruder had openings between the second zone and the third zone.
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| US4164603A (en) * | 1975-11-07 | 1979-08-14 | Akzona Incorporated | Filaments and fibers having discontinuous cavities |
| JPH0657519A (en) * | 1992-08-12 | 1994-03-01 | Yoshikazu Yamaguchi | Finely porous polymer and its production |
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