CN110616468B - Preparation method of bicomponent monofilament compositely formed under spinning box - Google Patents
Preparation method of bicomponent monofilament compositely formed under spinning box Download PDFInfo
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- CN110616468B CN110616468B CN201911025588.5A CN201911025588A CN110616468B CN 110616468 B CN110616468 B CN 110616468B CN 201911025588 A CN201911025588 A CN 201911025588A CN 110616468 B CN110616468 B CN 110616468B
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- 238000009987 spinning Methods 0.000 title claims abstract description 143
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 239000000155 melt Substances 0.000 claims abstract description 69
- 239000002131 composite material Substances 0.000 claims abstract description 40
- 238000002844 melting Methods 0.000 claims description 41
- 230000008018 melting Effects 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 16
- 230000003068 static effect Effects 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 11
- 238000009998 heat setting Methods 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 abstract description 57
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 abstract description 5
- 229960001484 edetic acid Drugs 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 34
- 239000005020 polyethylene terephthalate Substances 0.000 description 34
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 18
- 229920002292 Nylon 6 Polymers 0.000 description 17
- -1 polyethylene terephthalate Polymers 0.000 description 9
- 239000012535 impurity Substances 0.000 description 5
- 230000002411 adverse Effects 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000289 melt material Substances 0.000 description 2
- 241000675108 Citrus tangerina Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- D01D1/04—Melting filament-forming substances
-
- 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
- D01D1/09—Control of pressure, temperature or feeding rate
-
- 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
-
- 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
- D01D5/32—Side-by-side structure; Spinnerette packs therefor
-
- 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
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/12—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyamide as constituent
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Multicomponent Fibers (AREA)
Abstract
The invention provides a preparation method of a bicomponent monofilament compositely formed under a spinning manifold, which can conveniently and accurately control the spinning process temperature of high-melting-point melt and low-melting-point melt in each stage before entering a composite spinning assembly through arranging two sets of spinning equipment, thereby meeting the rheological property of two polymers required by the spinning process and further improving the spinning quality. Before the melt A enters the composite spinning assembly, the melt A with higher temperature is accurately controlled by the guide pipe to be cooled, so that the temperature of the melt A entering the composite spinning assembly can be ensured to be stabilized in a reasonable range, and the technical effects of ensuring the rheological property of the melt, the spinnability of the bicomponent monofilament, improving the quality of a monofilament finished product, and particularly reducing the broken filament rate and the broken end rate of the bicomponent monofilament are achieved.
Description
Technical Field
The invention relates to a preparation method of a bicomponent monofilament compositely formed under a spinning box body, belonging to the new technical field of chemical fibers.
Background
In general, composite spinning is accomplished in a composite spin pack of a spin beam. The bicomponent melt, which constitutes a bicomponent filament, is composed of two different polymers. The melting points of the two polymers are different and therefore the corresponding optimum spinning process temperatures are also different. When different polymer melts enter the same spinning manifold for compounding, the temperature of the manifold is generally set according to the polymer with high melting point, so that the spinning process temperature of the polymer with low melting point cannot reach the optimum, the rheological property of the polymer which cannot meet the requirements of the spinning process can not be met, and the spinning quality is directly influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of bicomponent monofilaments compositely formed under a spinning box. The method can conveniently and accurately control the spinning process temperatures of the high-melting-point polymer melt and the low-melting-point polymer melt respectively, so that the rheological properties of the two polymers required by the spinning process can be met, and the spinning quality is improved.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the invention provides a preparation method of a bicomponent monofilament compositely formed under a spinning box, which comprises the following steps:
after being melted by a screw A, the dried high-melting-point polymer A is input into a spinning manifold A to obtain a melt A with good rheological property; melting the dried low-melting-point polymer B slices through a screw B, and inputting the melted low-melting-point polymer B slices into a spinning box B to obtain a melt B with good rheological property;
cooling the melt A by a conduit with accurate temperature control, and ensuring the rheological property of the melt A while cooling;
simultaneously inputting the melt B and the cooled melt A into a composite spinning assembly in a spinning manifold B through a melt pipeline; and after the melt A and the melt B are converged and sprayed out at a spinneret orifice of the composite spinning assembly, the melt A and the melt B are subjected to cooling forming, primary water bath stretching, secondary hot air stretching, heat setting, oiling and winding to prepare the bicomponent monofilament.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold, the melting point temperature difference between the melt A and the melt B is preferably 20-150 ℃.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold, the melt A is preferably polyethylene terephthalate.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning beam, the melt B is preferably polyamide 6 or polytrimethylene terephthalate.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold, the composite mass percentage of the melt A and the melt B is preferably 25: 75-75: 25.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold, preferably, the temperature of the screw A is controlled to be 300-360 ℃; the temperature of the screw B is controlled to be 190-230 ℃; the temperature of the conduit is controlled to be 250-300 ℃.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold, preferably, the temperature of a composite spinning assembly is 280-300 ℃; the spinning speed is 60-300 m/min, and the diameter of the bicomponent monofilament is 0.05-3 mm.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold, the hole shape of the spinneret orifice preferably comprises any one of a sheath-core type, a parallel type or a tangerine petal type.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold, preferably, after the high-melting-point polymer A slice is melted by the screw A in the step, and before the polymer A slice is input into the spinning manifold A, the polymer A slice is filtered; after the low-melting-point polymer B chip is subjected to the step of melting by a B screw, the low-melting-point polymer B chip is further subjected to filtration treatment before being input into a B spinning beam.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold, preferably, after the high-melting-point polymer A slice is melted by the screw A in the step, and before the polymer A slice is input into the spinning manifold A in the step, static mixing treatment is carried out; the low melting point polymer B chips are subjected to static mixing treatment after the step of melting through a B screw and before the step of inputting into a B spinning beam.
The invention has the advantages or beneficial effects that:
the invention provides a preparation method of a bicomponent monofilament compositely formed under a spinning box, which comprises the following steps: respectively melting the dried high-melting-point polymer A slices and low-melting-point polymer B slices by screws, and inputting the melted high-melting-point polymer A slices and the low-melting-point polymer B slices into corresponding spinning boxes to obtain melts A and B with good rheological property; cooling the melt A by a conduit with accurate temperature control, and ensuring the rheological property of the melt A while cooling; and after the melt A and the melt B are converged and sprayed out at a spinneret orifice of the composite spinning assembly, the melt A and the melt B are subjected to cooling forming, primary water bath stretching, secondary hot air stretching, heat setting, oiling and winding to prepare the bicomponent monofilament. According to the method, two sets of spinning equipment (comprising drying equipment, a screw, a spinning box and the like) are arranged, so that the spinning process temperatures of the high-melting-point polymer melt and the low-melting-point polymer melt in the previous stages of the composite spinning assembly can be conveniently and accurately controlled respectively, the rheological properties of the two polymers required by the spinning process can be met, and the spinning quality is improved. The temperature of the melt A flowing out of the spinning box A is higher than the set temperature of the composite spinning assembly, and the melt temperature is too high, so that the spinnability of the bicomponent monofilament and the quality of a finished monofilament product are adversely affected, for example, the broken filament rate and the broken end rate of the bicomponent monofilament are increased, and the rheological property of the melt is reduced due to too low melt temperature, so that the uniformity of the filament outlet is affected. Before the melt A enters the composite spinning assembly, the melt A with higher temperature is accurately controlled by the guide pipe to be cooled, so that the temperature of the melt A entering the composite spinning assembly can be ensured to be stabilized in a reasonable range, and the technical effects of ensuring the rheological property of the melt, the spinnability of the bicomponent monofilament, improving the quality of a monofilament finished product, and particularly reducing the broken filament rate and the broken end rate of the bicomponent monofilament are achieved.
Drawings
The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a process flow diagram of a method of preparing a compositely formed bicomponent monofilament under a spinning beam of example 1 in accordance with the present invention;
fig. 2 is a process flow diagram of a method for preparing a bicomponent monofilament compositely formed under a spinning beam according to example 2 of the present invention.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making creative efforts, belong to the protection scope of the invention.
Example 1
In the prior art, composite spinning is generally completed in a composite spinning assembly of a spinning beam. The bicomponent melt, which constitutes a bicomponent filament, is composed of two different polymers. The melting points of the two polymers are different and therefore the corresponding optimum spinning process temperatures are also different. When different polymer melts enter the same spinning manifold for compounding, the temperature of the manifold is generally set according to the polymer with high melting point, so that the spinning process temperature of the polymer with low melting point cannot reach the optimum, the rheological property of the polymer which cannot meet the requirements of the spinning process can not be met, and the spinning quality is directly influenced.
The embodiment of the invention provides a preparation method of a bicomponent monofilament compositely formed under a spinning box, which comprises the following steps: after being melted by a screw A, the dried high-melting-point polymer A is input into a spinning manifold A to obtain a melt A with good rheological property; melting the dried low-melting-point polymer B slices through a screw B, and inputting the melted low-melting-point polymer B slices into a spinning box B to obtain a melt B with good rheological property; cooling the melt A by a conduit with accurate temperature control, and ensuring the rheological property of the melt A while cooling; simultaneously inputting the melt B and the cooled melt A into a composite spinning assembly in a spinning manifold B through a melt pipeline; and after the melt A and the melt B are converged and sprayed out at a spinneret orifice of the composite spinning assembly, the melt A and the melt B are subjected to cooling forming, primary water bath stretching, secondary hot air stretching, heat setting, oiling and winding to prepare the bicomponent monofilament.
The process flow diagram of the preparation method of the bicomponent monofilament compositely formed under the spinning beam of the embodiment 1 of the invention is shown in fig. 1. According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold provided by the embodiment 1, two sets of spinning equipment (comprising drying equipment, a screw, the spinning manifold and the like) are arranged, so that the spinning process temperatures of the high-melting-point polymer melt and the low-melting-point polymer melt in each stage before entering the composite spinning assembly can be conveniently and accurately controlled respectively, the rheological properties of the two polymers required by the spinning process can be met, and the spinning quality is improved. The temperature of the melt A flowing out of the spinning box A is higher than the set temperature of the composite spinning assembly, and the melt temperature is too high, so that the spinnability of the bicomponent monofilament and the quality of a finished monofilament product are adversely affected, for example, the broken filament rate and the broken end rate of the bicomponent monofilament are increased, and the rheological property of the melt is reduced due to too low melt temperature, so that the uniformity of the filament outlet is affected. Before the melt A enters the composite spinning assembly, the melt A with higher temperature is accurately controlled by the guide pipe to be cooled, so that the temperature of the melt A entering the composite spinning assembly can be ensured to be stabilized in a reasonable range, and the technical effects of ensuring the rheological property of the melt, the spinnability of the bicomponent monofilament, improving the quality of a monofilament finished product, and particularly reducing the broken filament rate and the broken end rate of the bicomponent monofilament are achieved.
In the prior art, a preparation method of a bicomponent monofilament combining two melt raw materials with a melting point temperature difference of 100-150 ℃ is not mature, and the technical problem that the quality of a prepared bicomponent monofilament finished product is poor exists. In the preparation method of the bicomponent monofilament compositely formed under the spinning beam provided in embodiment 1 of the present invention, preferably, the melting point temperature difference between the melt a and the melt B is 20 to 150 ℃. The processes of the two melts at each stage before entering the composite spinning assembly are respectively carried out, so that the relative independence of the melt A with the high melting point and the melt B with the low melting point can be ensured, and the rheological properties of the two melts can be fully considered by adopting the preparation method of the bicomponent monofilament in the embodiment 1 of the invention for the two melt raw materials with the melting point temperature difference within a wider temperature range of 20-150 ℃, thereby improving the comprehensive quality of the bicomponent monofilament finished product.
The polyethylene terephthalate is a melt material with wide application, and in order to better meet market demands, the embodiment of the invention provides a preparation method of a bicomponent monofilament compositely formed under a spinning manifold, preferably, the melt A is specifically polyethylene terephthalate.
The polyamide 6 and the polytrimethylene terephthalate are widely applied melt materials, and in order to better meet market demands, the embodiment of the invention provides the preparation method of the bicomponent monofilament compositely formed under the spinning beam, and preferably, the melt B is specifically the polyamide 6 or the polytrimethylene terephthalate.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning beam, the composite mass percentage of the melt A and the melt B is preferably 25: 75-75: 25.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold, provided by the embodiment of the invention, preferably, the temperature of the screw A is controlled to be 300-360 ℃; the temperature of the screw B is controlled to be 190-230 ℃; the temperature of the conduit is controlled to be 250-300 ℃.
According to the preparation method of the bicomponent monofilament compositely formed under the spinning manifold, provided by the embodiment of the invention, preferably, the temperature of a composite spinning assembly is 280-300 ℃; the spinning speed is 60-300 m/min, and the diameter of the bicomponent monofilament is 0.05-3 mm.
Researches show that the change of the hole shape of the spinneret orifice can directly influence the structure of the produced bicomponent monofilament, and can even have great influence on performance indexes such as the draft ratio, the monofilament strength, the boiling water shrinkage rate, the fluffiness and the like. In order to facilitate the production of bicomponent monofilaments with more various structures, in the preparation method of bicomponent monofilaments compositely formed under a spinning manifold provided by the embodiment of the invention, preferably, the hole shape of the spinneret orifice comprises any one of a sheath-core type, a side-by-side type or a tangerine-petal type. The method of the embodiment 1 of the invention can be used for producing the bicomponent monofilament of any type of sheath-core type, side-by-side type or orange petal type, thereby greatly expanding the applicable product field of the method.
Example 2
Certain impurities inevitably exist in the polymer slices, and are brought into the composite spinning assembly after being melted by the screw, and because the size of a spinneret orifice in the composite spinning assembly is small, the impurities are easy to accumulate at the spinneret orifice, so that the yarn output uniformity of the composite spinning is adversely affected. In order to solve the above problems, embodiments of the present invention provide a method for preparing a bicomponent monofilament through composite forming under a spinning beam, based on embodiment 1, preferably, after the high melting point polymer a chip is subjected to the step "melting by a screw a", before the step "inputting into a spinning beam a", the high melting point polymer a chip is further subjected to a filtration treatment; after the low-melting-point polymer B chip is subjected to the step of melting by a B screw, the low-melting-point polymer B chip is further subjected to filtration treatment before being input into a B spinning beam. The melt can be purified by the filtration treatment, and impurities from the polymer slices are removed, so that the accumulation of the impurities at the spinneret holes is greatly reduced, and the adverse effect of blockage of the spinneret holes by the accumulation of the impurities on the yarn outlet uniformity of the composite spinning is avoided; the breakage rate of the bicomponent monofilament caused by uneven filament discharge is reduced, and the exchange period of the spinning nozzle is prolonged.
As the polymer slice raw materials selected for preparing the bicomponent monofilaments are mostly high molecular materials, namely the polymer slices are a mixture formed by polymers with molecular weights within a specific range; after the polymer slices are melted by the screw, the polymer slices are changed from a solid state to a molten state; however, the fluidity of the polymer molecules in the molten state is still limited, and the problem of local uneven distribution may exist, and the preparation method of the bicomponent monofilament compositely formed under the spinning beam provided by the embodiment of the invention further preferably includes that after the high-melting-point polymer a chip is melted by the screw a in the step "and before the high-melting-point polymer a chip is input into the spinning beam a", the high-melting-point polymer a chip is subjected to static mixing treatment; the low melting point polymer B chips are subjected to static mixing treatment after the step of melting through a B screw and before the step of inputting into a B spinning beam. The polymer molecules with different molecular weights are fully and uniformly mixed through static mixing treatment, so that the uniformity of the yarn is ensured, the yarn breakage rate is reduced, and the spinning quality is improved.
The process flow diagram of the preparation method of the bicomponent monofilament compositely formed under the spinning beam comprising filtration and static mixing treatment is shown in fig. 2.
Example 3
The embodiment 3 of the invention provides a preparation method of PA6/PET bicomponent monofilament compositely formed under a spinning manifold, which comprises the following steps:
(1) separately preparing polyethylene terephthalate (PET, melting point: 290 ℃) slices and polyamide 6(PA6, melting point: 140 ℃) slices;
(2) respectively carrying out drying, screw melting, filtering and static mixing treatment on the PET slices and the PA6 slices, and respectively obtaining a PET melt and a PA6 melt by outputting from corresponding spinning manifolds, wherein:
when drying, a vacuum drier is adopted, and the drying temperature is 100 ℃; at the end of drying, the water content of the PET slices and PA6 slices is less than 0.1%;
during filtering, the aperture of the filter screen of the melt filter is 40 μm, and the use pressure of the filter element is 2.5 × 106Pa；
During static mixing, an LPD static mixer with the pipe diameter of 0.06m is adopted;
PET (a screw) when the screw is molten: rotating speed of 70-80 rpm, heating area of A screw: 300-315 ℃ in the first area, 315-325 ℃ in the second area, 325-335 ℃ in the third area, 335-345 ℃ in the fourth area and 345-360 ℃ in the fifth area;
PA6(B screw): rotating speed of 55-65 rpm, heating area of screw B: the temperature of the first zone is 190-200 ℃, the temperature of the second zone is 200-210 ℃, the temperature of the third zone is 210-220 ℃, and the temperature of the fourth zone is 220-230 ℃.
(3) The catheter cools the PET melt, wherein:
the guide pipe is sequentially provided with the following heating areas along the direction from the spinning manifold A to the spinning manifold B: the temperature of the first zone is 300-290 ℃, the temperature of the second zone is 290-280 ℃, the temperature of the third zone is 280-260 ℃, the temperature of the fourth zone is 260-250 ℃ and the temperature of the fifth zone is 250 ℃.
(4) Simultaneously inputting the PA6 melt and the cooled PET melt into a composite spinning assembly in a spinning manifold B through a melt pipeline; the PA6 melt and the PET melt are converged and sprayed out at a spinneret orifice of the composite spinning assembly to obtain PA6/PET raw silk; wherein,
the compounding ratio of the PET melt to the PA6 melt was 25: 75;
the hole shapes of the spinneret orifices are parallel;
the temperature of the composite spinning assembly is 280 ℃; the spinning speed was 300 m/min.
(5) The PA6/PET protofilament is made into a parallel PA6/PET double-component monofilament with the diameter of 3mm after cooling forming, primary water bath stretching, secondary hot air stretching, heat setting, oiling and winding, wherein:
when cooling and forming, adopting a freezing air ring blowing method, wherein the air speed is 0.4m/s, and the temperature of the freezing air is 10-15 ℃;
when primary water bath stretching is carried out, the water bath temperature is 80-85 ℃, and the stretching ratio is 1.5 times;
when secondary hot air stretching is carried out, the temperature of hot air is 120-140 ℃, and the stretching magnification is 2-3 times;
when in heat setting, the setting temperature is 150-160 ℃;
and during winding, the rotating speed is 800-1000 m/min, and the total length of the double-component monofilaments in each roll is 2000 m.
Through detection, the prepared PA6/PET bicomponent monofilament has the following properties: the breaking strength is 3.52 cN/dtex; elongation at break 35%.
Example 4
The embodiment 4 of the invention provides a preparation method of PTT/PET bicomponent monofilament compositely formed under a spinning box, which comprises the following steps:
(1) preparing polyethylene terephthalate (PET, melting point: 265 ℃) slices and polytrimethylene terephthalate (PTT, melting point: 230 ℃) slices respectively;
(2) drying, screw rod melting, filtering and static mixing processing are respectively carried out on the PET slices and the PTT slices, and PET melt and PTT melt are respectively obtained through output of corresponding spinning boxes, wherein:
when drying, a vacuum drier is adopted, and the drying temperature is 100 ℃; when the drying is finished, the water content of the PET slices and the PTT slices is less than 0.1%;
during filtering, the aperture of the filter screen of the melt filter is 45 μm, and the use pressure of the filter element is 2.5 × 106Pa；
During static mixing, an LPD static mixer with the pipe diameter of 0.06m is adopted;
PET (a screw) when the screw is molten: rotating speed of 70-80 rpm, heating area of A screw: 300-315 ℃ in the first area, 315-325 ℃ in the second area, 325-335 ℃ in the third area, 335-345 ℃ in the fourth area and 345-360 ℃ in the fifth area;
PTT (B screw): rotating speed of 55-65 rpm, heating area of screw B: the temperature of the first zone is 190-200 ℃, the temperature of the second zone is 200-210 ℃, the temperature of the third zone is 210-220 ℃, and the temperature of the fourth zone is 220-230 ℃.
(3) The catheter cools the PET melt, wherein:
the guide pipe is sequentially provided with the following heating areas along the direction from the spinning manifold A to the spinning manifold B: the temperature of the first zone is 300-290 ℃, the temperature of the second zone is 290-280 ℃, the temperature of the third zone is 280-260 ℃, the temperature of the fourth zone is 260-250 ℃ and the temperature of the fifth zone is 250 ℃.
(4) Simultaneously inputting the PTT melt and the cooled PET melt into a composite spinning assembly in a spinning manifold B through a melt pipeline; the PTT melt and the PET melt are converged and sprayed out at a spinneret orifice of the composite spinning component to obtain PTT/PET protofilaments; wherein,
the compounding ratio of the PET melt to the PTT melt is 75: 25;
the hole shape of the spinneret orifice is a sheath-core type, wherein PTT is a skin layer, and PET is a core layer;
the temperature of the composite spinning assembly is 300 ℃; the spinning speed was 60 m/min.
(5) The PTT/PET protofilament is made into a sheath-core PTT/PET double-component monofilament with the diameter of 0.05mm after cooling forming, primary water bath stretching, secondary hot air stretching, heat setting, oiling and winding, wherein:
when cooling and forming, adopting a freezing air ring blowing method, wherein the air speed is 0.4m/s, and the temperature of the freezing air is 10-15 ℃;
when primary water bath stretching is carried out, the water bath temperature is 90-100 ℃, and the stretching magnification is 2-2.5 times;
when secondary hot air stretching is carried out, the hot air temperature is 150-180 ℃, and the stretching magnification is 2-4 times;
when in heat setting, the setting temperature is 180-210 ℃;
and during winding, the rotating speed is 800-1000 m/min, and the total length of the double-component monofilaments in each roll is 5000 m.
Through detection, the performance of the prepared PTT/PET double-component monofilament is as follows: the breaking strength is 2.52 cN/dtex; elongation at break 43%.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A preparation method of bicomponent monofilaments compositely formed under a spinning manifold is characterized by comprising the following steps:
melting the dried PET slices with the melting point of 290 ℃ by a screw A, and inputting the PET slices into a spinning box A to obtain a PET melt with good rheological property; PA6 slices with the melting point of 140 ℃ after drying treatment are melted by a screw B and then input into a spinning manifold B to obtain a PA6 melt with good rheological property;
cooling the PET melt by a guide pipe with accurate temperature control, and ensuring the rheological property of the PET melt while cooling; wherein: the guide pipe is sequentially provided with the following heating areas along the direction from the spinning manifold A to the spinning manifold B: 300-290 ℃ in the first area, 290-280 ℃ in the second area, 280-260 ℃ in the third area, 260-250 ℃ in the fourth area and 250 ℃ in the fifth area;
simultaneously inputting the PA6 melt and the cooled PET melt into a composite spinning assembly in a spinning manifold B through a melt pipeline; and after the PET melt and the PA6 melt are converged and sprayed out at a spinneret orifice of the composite spinning assembly, the PA6/PET bicomponent monofilament is prepared after cooling forming, primary water bath stretching, secondary hot air stretching, heat setting, oiling and winding.
2. The method for preparing the bicomponent monofilament compositely formed under the spinning beam as claimed in claim 1, wherein the composite mass percentage of the PET melt and the PA6 melt is 25: 75-75: 25.
3. The method for preparing the bicomponent monofilament compositely formed under the spinning beam as claimed in claim 1, wherein the temperature of the screw A is controlled at 300-360 ℃; the temperature of the screw B is controlled to be 190-230 ℃.
4. The method for preparing the bicomponent monofilament compositely formed under the spinning beam as claimed in claim 1, wherein the temperature of the composite spinning assembly is 280-300 ℃; the spinning speed is 60-300 m/min, and the diameter of the PA6/PET bicomponent monofilament is 0.05-3 mm.
5. The method of claim 1, wherein the spinneret holes have any one of a sheath-core type, a side-by-side type and a orange-petal type.
6. The method for preparing bicomponent monofilaments compositely formed under a spinning beam according to claim 1, wherein after the step of melting by the screw a, PET chips having a melting point of 290 ℃ are further subjected to a filtration treatment before the step of feeding into the spinning beam a; the PA6 chips with a melting point of 140 ℃ were also subjected to filtration after the step "melting by B screw" and before the step "feeding into B spinning beam".
7. The method for preparing bicomponent monofilaments compositely formed under a spinning beam according to claim 1, wherein after the step of melting by the screw a, PET chips having a melting point of 290 ℃ are subjected to static mixing before the step of feeding into the spinning beam a; the PA6 chips with a melting point of 140 ℃ were subjected to static mixing after the step "melting by means of the B screw" and before the step "feeding into the B spinning beam".
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