CN210237899U - PLA polylactic acid differential shrinkage composite fiber's apparatus for producing - Google Patents
PLA polylactic acid differential shrinkage composite fiber's apparatus for producing Download PDFInfo
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- CN210237899U CN210237899U CN201920776610.9U CN201920776610U CN210237899U CN 210237899 U CN210237899 U CN 210237899U CN 201920776610 U CN201920776610 U CN 201920776610U CN 210237899 U CN210237899 U CN 210237899U
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Abstract
The utility model relates to a PLA polylactic acid differential shrinkage composite fiber's apparatus for producing. The production device comprises a drying system, a screw extruder, a spinning assembly, a side blowing device, an oiling device, a channel, a drafting assembly, a network device and a winding machine which are sequentially arranged according to the process flow. The utility model discloses be favorable to different shrink composite fiber's of PLA polylactic acid effective popularization.
Description
Technical Field
The utility model belongs to the technical field of weaving chemical fiber production, especially, relate to a PLA polylactic acid differential shrinkage composite fiber's apparatus for producing.
Background
Polylactic acid (PLA) fiber is used as a raw material, the polylactic acid is derived from plants and non-fossil fuel, and the fiber has natural degradability, luster and hand feeling similar to real silk and certain water absorption, is a good fiber material and has great development potential. The polylactic acid differential shrinkage fiber is formed by compounding two filaments with different shrinkage degrees, the fabric has good hand feeling, is real intelligent multifunctional fiber, and has richer application fields.
At present, the domestic production of polylactic acid different shrinkage yarns is not multiple in technical methods, the technical capability is limited, and the produced polylactic acid different shrinkage yarns are low in shrinkage stability, so that the effective popularization of the product is hindered.
SUMMERY OF THE UTILITY MODEL
To the problem that above-mentioned prior art exists, the utility model provides a different shrink composite fiber's of PLA polylactic acid apparatus for producing to do benefit to different shrink composite fiber's of PLA polylactic acid effective popularization.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
a production device of PLA polylactic acid differential shrinkage composite fibers comprises a drying system, a screw extruder, a spinning assembly, a side blowing device, an oiling device, a channel, a drafting assembly, a network device and a winding machine which are sequentially arranged according to a process flow, wherein the drying system comprises a crystallizer and a drying tower, the crystallizer comprises a shell, the top of the shell is provided with a feed inlet, the feed inlet is positioned under a stock bin, the top of the side part of the shell is provided with a impurity removing port, and the bottom of the shell is provided with at least two air inlets;
introducing hot air through at least two air inlets so as to discharge dust in the polylactic acid raw material falling from the feeding hole from the impurity removing hole;
the side part of the drying tower is provided with at least two air inlets, and drying air is introduced through the at least two air inlets so as to dry the polylactic acid raw material falling into the drying tower and removing dust.
Further, the spinning assembly comprises a spinning manifold, a melt feeding pipe, a melt distribution pipe, a metering pump and a spinner, wherein:
one end of the melt feeding pipe is connected with the output end of the screw extruder, and the other end of the melt feeding pipe extends into the spinning box body;
the melt distribution pipe, the metering pump and the spinning device are all arranged in the spinning box body;
the number of the melt distribution pipes is two, one end of each melt distribution pipe is connected with the other end of the melt feeding pipe, and each melt distribution pipe is provided with the metering pump;
the spinning ware with the fuse-element distributing pipe one-to-one sets up, the spinning ware includes that the fuse-element carries house steward, melt processor, branch pipe and spinneret, house steward's one end and correspondence are carried to the fuse-element the other end of fuse-element distributing pipe is connected, house steward's the other end is carried to the fuse-element with melt processor connects, the branch pipe is carried to the fuse-element is provided with a plurality ofly, and is a plurality of the branch pipe is carried to the fuse-element with the melt processor connects, the spinneret is provided with a plurality of spinning holes, the spinning hole with branch pipe one-to-one sets up is carried to the fuse-element, the other end of.
Further, a suction unit is arranged between the spinning assembly and the side blowing device, and the suction unit can suck away polylactic acid slices which do not form tows.
Further, the side blowing device comprises a blowing box body and an air inlet cylinder, wherein a plurality of through wire holes are formed in the top of the blowing box body, through holes and an air net are formed in the bottom of the blowing box body, the air net is arranged on one horizontal side of the through holes, and the air inlet cylinder is arranged below the air net;
the plurality of through hole and the through hole are located in the same vertical direction.
Further, the box that blows has first lateral wall, first lateral wall is close to the wind net, first lateral wall with the wind net is the acute angle setting.
Furthermore, a filtering layer is vertically arranged in the blowing box body, and the top and the bottom of the filtering layer are respectively connected to the top of the first side wall and the air net.
Furthermore, the blowing box body is also provided with a second side wall, the second side wall and the first side wall are oppositely arranged, and two doors which are opposite and can be opened are arranged on the second side wall.
Further, the draft subassembly is including parallelly connected first draft unit and second draft unit, first draft unit includes according to the network ware in advance that process flow set gradually, first pair of hot roller set, second draft unit includes according to first godet and the second godet that process flow set gradually.
The utility model has the advantages that:
the utility model provides a production device of PLA polylactic acid differential shrinkage composite fiber, when in implementation, firstly, the polylactic acid raw material is dried by a drying system, and then the dried polylactic acid raw material enters a screw extruder for fusion and compression; the melt-compressed polylactic acid raw material enters a spinning assembly, melt stream filament bundles are sprayed out through the spinning assembly and divided into FDY partial filament bundles and POY partial filament bundles which are independent of each other, then the two partial filament bundles are cooled through a side blowing device, an oiling device and a channel, the cooled FDY partial filament bundles and the cooled POY partial filament bundles are stretched through the drawing assembly, enter a main network device network together for compounding and grid connection, and then enter a winding machine for winding into spinning cakes.
Through the utility model provides a different shrink composite fiber's of PLA polylactic acid apparatus for producing, the different shrink composite fiber of polylactic acid that obtains is soft fine and smooth, feels comfortable type and is superior to different shrink composite filament of dacron, more is fit for weaving high-quality surface fabric, is favorable to different shrink composite fiber's of PLA polylactic acid effective popularization.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a production device for PLA polylactic acid differential shrinkage composite fiber according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the drying system of FIG. 1;
FIG. 3 is a schematic diagram of the construction of the spin pack assembly of FIG. 1;
FIG. 4 is an internal schematic view of FIG. 3;
FIG. 5 is a top view of FIG. 3;
FIG. 6 is a schematic diagram of a spinner of the spin pack assembly of FIG. 3;
FIG. 7 is a schematic structural view of the side blowing device in FIG. 1;
FIG. 8 is a side view of FIG. 7;
fig. 9 is a schematic flow chart of a production method of PLA polylactic acid hetero-shrinkage composite fiber according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Firstly, the embodiment of the invention discloses a production device of PLA polylactic acid differential shrinkage composite fiber.
Fig. 1 is a schematic structural diagram of a production apparatus for PLA polylactic acid hetero-shrinkage composite fiber according to an embodiment of the present invention, referring to fig. 1, the apparatus includes a drying system 1, a screw extruder 2, a spinning assembly 3, a suction device 4, a side blowing device 5, an oiling device 6, a shaft 7, a drafting assembly, a network 13, and a winding machine 16, which are sequentially arranged according to a process flow.
Fig. 2 is a schematic structural diagram of the drying system shown in fig. 1, and referring to fig. 2, the drying system 1 according to the embodiment of the present invention includes a crystallizer 1.1 and a drying tower 1.2, wherein the crystallizer 1.1 includes a housing, a feed inlet 1.11 is disposed at the top of the housing, the feed inlet 1.11 is located right below a storage bin a, a impurity removing port 1.12 is disposed at the top of a side portion of the housing, and at least two air inlets 1.13 are disposed at the bottom of the housing. Polylactic acid raw materials enter the crystallizer 1.1 from the stock bin a and the feed inlet 1.11, meanwhile, hot air is introduced into the crystallizer 1.1 through at least two air inlets 1.13, the raw materials are dried by the hot air, and the crystallizer with double air inlets is adopted, so that the provided heat is more sufficient, and the crystallization of the polylactic acid raw materials is realized; meanwhile, in the process of drying the raw materials by the hot air, light impurities such as dust mixed in the raw materials can be discharged from the impurity removing port 1.12 so as to maintain the purity of the polylactic acid raw materials.
In the embodiment of the present invention, hot air may be introduced into the mold 1 through a blower and a delivery pipe.
Further, referring to fig. 2, the side of the drying tower 1.2 of the embodiment of the present invention is provided with at least two air inlets 1.21, and drying air is introduced through the at least two air inlets 1.21 to dry the polylactic acid raw material falling into the drying tower after dust removal.
Because the drying tower 1.2 in the embodiment of the invention is also provided with the two air inlets 1.21, more drying air can be conveyed by the air pump, so that the drying effect of the polylactic acid raw material is more uniform and stable.
In the embodiment of the invention, the screw extruder 2 can be a special bimetallic screw extruder processed by a novel alloy covering type roasting and jetting technology, and is provided with a pin mixing head and a length-diameter ratio of 25, and the special bimetallic screw extruder is provided with a screw from a first-zone feeding end to a sixth-zone discharging end, so that the melt can be ensured to be uniform and stable.
Fig. 3 is a schematic structural diagram of the spinning assembly in fig. 1, fig. 4 is a schematic internal diagram of fig. 3, fig. 5 is a schematic top view of fig. 3, and with reference to fig. 3-5, the spinning assembly 3 according to an embodiment of the present invention includes a spinning beam 3.1, a melt feed pipe 3.2, a melt distribution pipe 3.3, a metering pump 3.4, and a spinner 3.5, one end of the melt feed pipe 3.2 is connected to an output end of the screw extruder 2, the other end of the melt feed pipe 3.2 extends into the spinning beam 3.1, the melt distribution pipe 3.3, the metering pump 3.4, and the spinner 3.5 are all disposed in the spinning beam 3.1, two melt distribution pipes 3.3 are disposed, one end of each melt distribution pipe 3.3 is connected to the other end of the melt feed pipe 3.2, and a metering pump 3.4 is disposed on each melt distribution.
Fig. 6 is a schematic structural diagram of a spinner of the spinning pack in fig. 3, and referring to fig. 6, a spinner 3.5 and a melt distribution pipe 3.3 according to an embodiment of the present invention are arranged in a one-to-one correspondence manner, the spinner includes a melt delivery main pipe 3.51, a melt processor 3.52, melt delivery branch pipes 3.53 and a spinneret plate 3.54, one end of the melt delivery main pipe 3.53 is connected with the other end of the corresponding melt distribution pipe 3.3, the other end of the melt delivery main pipe 3.53 is connected with the melt processor 3.52, the melt delivery branch pipes 3.53 are provided in plural, the melt delivery branch pipes 3.53 are connected with the melt processor 3.52, the spinneret plate 3.54 is provided with a plurality of spinning holes, the spinning holes and the melt delivery branch pipes 3.53 are arranged in a one-to-one correspondence manner, and the other ends of the.
During implementation, a polylactic acid raw material in a molten state enters the two melt distribution pipes 3.3 through the melt feeding pipe 3.2, then a quantitative polylactic acid raw material is output to the corresponding spinners 3.5 through the metering pumps 3.4, then the polylactic acid raw material enters the melt processor 3.52 through the melt conveying main pipe 3.51 of the spinners 3.5 for filtration and pressurization, and then the polylactic acid raw material is input to the corresponding spinning holes through the plurality of melt conveying branch pipes 3.53 to be processed into fiber tows.
In addition, the spinning assembly 3 in the embodiment of the invention can also comprise a heat medium pipe, the heat medium pipe is fixedly arranged on the spinning manifold 3.1, and the heat medium flows in the heat medium pipe and is used for heating a pipeline through which a melt passes, so that the melt raw material is heated and insulated, and the raw material in a molten state is prevented from solidifying and cooling to influence the yarn discharge.
Specifically, in the embodiment of the present invention, the heat medium used in the heat medium pipe may be low-temperature diphenyl ether with a boiling point of about 200 ℃ as a heat medium, the temperature is controlled to be 200-230 ℃, and of course, the heat medium may be hot oil or gas, which is not limited in this embodiment of the present invention.
In the embodiment of the invention, as each melt distribution pipe 3.3 is provided with the metering pump 3.4, not only the melt raw material can be conveyed, but also the melt raw material can be continuously and accurately supplied to the spinning device for quantitative spinning, and the metering pump 3.4 can be a corrosion-resistant material planetary metering pump, so that the melt raw material is conveyed more accurately.
According to the embodiment of the invention, because the two spinners 3.5 are arranged, FDY partial tows and POY partial tows which are distributed in a left-right symmetrical equal-head number mode are respectively output through different processing of the melt processor 3.52 in the spinners 3.5.
Further, the spinneret plate 3.54 may be a plate with a radius of 95-105 mm, and the section of the spinneret plate may be circular or irregular, which is not limited in the embodiment of the present invention.
The suction device 4 of the embodiment of the invention is arranged below the spinning assembly 3 and is used for sucking away polylactic acid monomers which do not form tows so as to avoid influencing the subsequent process and ensure the quality of the tows.
The suction device 4 of the embodiment of the invention can adopt circulating water negative pressure suction to fully suck out the monomer.
Fig. 7 is a schematic structural diagram of the side blowing device 5 in fig. 1, fig. 8 is a schematic side view of fig. 7, and with reference to fig. 7 and fig. 8, the side blowing device 5 of the embodiment of the present invention includes a blowing box 5.1 and an air inlet duct 5.2, the top of the blowing box 5.1 is provided with a plurality of through holes, the through holes and the spinning holes of the spinning pack are arranged in a one-to-one correspondence manner, the bottom of the blowing box 5.1 is provided with a through hole and an air mesh 5.3, the air mesh 5.3 is arranged on one horizontal side of the through hole, the air inlet duct 5.2 is arranged below the air mesh 5.3, and the plurality of through holes and the through hole are located in the same vertical direction.
When the cooling device is used, tows sprayed from the spinning holes in the spinning assembly pass through the corresponding through-wire holes and are introduced into the blowing box body and then are led out from the through holes, and meanwhile, cooling air is introduced into the air inlet barrel communicated with the output part of the blowing device, so that the tows passing through the blowing box body are cooled.
The blowing device of the embodiment of the present invention may be a blower or the like, and the type of the blowing device is not limited herein.
With reference to fig. 7, in the embodiment of the present invention, the suction device 4 may include a suction pipe, one end of which is located inside the blow box body 5.1, one end of which is open, and the other end of which is located outside the blow box body 5.1, so as to suck the polylactic acid monomer which is not formed into the filament bundle from the open end to the outside of the blow box body 5.1 for collection.
With reference to fig. 7 and 8, the blowing box 5.1 of the embodiment of the invention has the first side wall 5.11, the first side wall 5.11 is close to the wind net 5.3, and the first side wall 5.11 and the wind net 5.3 are arranged at an acute angle, so that the first side wall 5.11 forms a guide plate to introduce cooling wind more efficiently and realize rapid cooling of the tows.
With reference to fig. 7 and 8, a filter layer 5.4 is vertically arranged in the blowing box body 5.1 according to the embodiment of the invention, the top and the bottom of the filter layer 5.4 are respectively connected to the top of the side wall 5.11 and the air net 5.3, and the filter layer can filter cooling air directly exchanging heat with the tows, so that the problem that the quality of the tows is affected by impurities wound on the tows in a high-temperature state is avoided.
In the embodiment of the invention, the filter layer 5.4 can be arranged in the air inlet box body 5.1 in a pluggable manner, so that the cooling air entering the air blowing box body can be filtered, the production quality of tows is ensured, and the filter layer can be periodically disassembled, assembled and cleaned, and the cooling air is ensured to pass through smoothly.
Furthermore, the filter layer 5.4 of the embodiment of the invention can be formed by combining a porous filter plate, a filter screen and a honeycomb plate which are sequentially arranged in the box body along the horizontal direction, so that impurities with different sizes can be filtered from outside to inside.
Further, with reference to fig. 7 and 8, the blowing box 5.1 of the embodiment of the invention has a second side wall 5.12, the second side wall 5.12 and the first side wall 5.11 are oppositely arranged, and two doors 5.13 which are oppositely opened are arranged on the second side wall 5.12, so that not only can the interior of the box be observed, but also when the phenomenon of tow knotting and the like occurs in the interior of the box, the tow can be operated.
The embodiment of the invention adopts the air cooling mode to cool the tows, thereby not only improving the cooling effect of the tows, but also improving the spinning speed of the equipment and improving the yield of finished fiber tows.
Further, with reference to fig. 7, in the embodiment of the present invention, the height of the blowing box 5.1 corresponding to the filter layer 5.4 is a blowing area, the height is 1400 to 1800mm, and a D-shaped air outlet curve is used to ensure sufficient and uniform cooling and prevent quenching, while the height of the blowing box 5.1 below the spinning box is a calm area, the height is 90 to 130mm, because the height of the calm area directly affects the quality of the filament bundle, and the setting of the height of the calm area in the embodiment of the present invention can avoid the phenomenon that the temperature drops too fast and the quality of the filament is poor.
Further, the oiling device 6 in the embodiment of the invention is an oil nozzle oiling system, and the oil nozzle oiling system is used for applying oil by using an anti-splashing, low-friction and wear-resistant oil nozzle, so that the evenness is stable, and the dyeing uniformity is ensured.
In the embodiment of the invention, the channel 7 is a channel through which the tows naturally pass, is used for fully oiling the oiled tows and preventing the tows from fading, and the length of the channel can be specifically set according to the requirement.
With reference to fig. 1, in the embodiment of the present invention, the drafting assembly includes a first drafting unit and a second drafting unit which are connected in parallel, the first drafting unit includes a pre-interlacer 8, a first pair of hot roller sets 9, and a second pair of hot roller sets 10 which are sequentially arranged according to a process, and the second drafting unit includes a first godet 11 and a second godet 12 which are sequentially arranged according to the process.
In the prior art, each pair of drafting rollers in the drafting assembly is usually a cold roller and a hot roller which are matched with each other, so that the fiber tows are insufficiently tensioned and unevenly heated, the physical properties of the fiber tows are greatly different, the breaking strength is low, and the requirements of the subsequent process cannot be met.
In the embodiment of the invention, the first pair of hot roller sets 9 and the second pair of hot roller sets 10 are both composed of two hot rollers, so that the FDY part of the PLA polylactic acid differential shrinkage composite fiber can be extended and the internal structure can be stabilized, the internal drafting stress can be effectively eliminated, the shape stability of the fiber tows can be improved, the breaking strength of the fiber tows can be improved, and the end breakage rate of the fiber tows can be reduced.
In the embodiment of the invention, the pre-network device 8 is arranged before the FDY partial tows enter the first pair of hot roller sets 9 and the second pair of hot roller sets 10, so that the FDY partial tows can be knotted, and the end breakage rate is further reduced.
Because the POY part of the PLA polylactic acid differential shrinkage composite fiber does not need to be stretched here due to the characteristics of the POY part, the embodiment of the invention only needs to guide the tow of the POY part through the first godet 11 and the second godet 12.
And after passing through the drafting assembly, the FDY partial tows and the POY partial tows enter a main network device for composite synchronization, and then are wound into spinning cakes through a winding machine. The winding machine provided by the embodiment of the invention is a precise anti-overlapping system, so that good wire forming can be fully ensured, and the number of the winding machine is generally 16-24, so that sufficient capacity is ensured, and economic benefits are improved.
In addition, based on the production device of the PLA polylactic acid differential shrinkage composite fiber, the embodiment of the invention also provides a production method of the PLA polylactic acid differential shrinkage composite fiber.
Fig. 9 is a schematic flow chart of a production method of PLA polylactic acid differential shrinkage composite fiber according to an embodiment of the present invention, and in conjunction with fig. 9, the production method includes:
s1: providing a polylactic acid raw material;
s2: drying the provided polylactic acid raw material;
s3: conveying the dried polylactic acid raw material to a spinning assembly through a screw extruder, and melting and compressing the polylactic acid raw material through the screw extruder to form a molten polylactic acid raw material;
s4: the polylactic acid raw material in a molten state is sprayed out of FDY partial tows and POY partial tows through a spinning assembly;
s5: the FDY part of tows and the POY part of tows simultaneously pass through a side blowing device, an oiling device and a channel;
s6: the FDY partial tows pulled out of the passage are sequentially pulled and stretched by a first pair of hot roller sets and a second pair of hot roller sets, and meanwhile, the POY partial tows pulled out of the passage are sequentially pulled and stretched by a first godet and a second godet;
s7: and (3) the FDY partial tows after traction and stretching and the POY partial tows enter a main network device network together for compounding and grid connection, and then enter a winding machine to be wound into a spinning cake.
S1 of the embodiment of the present invention specifically includes:
the polylactic acid raw material in the embodiment of the invention is preferably a spinning-grade PLA polylactic acid slice, the average molecular weight is 200000-300000, the melting point is 173-.
S2 of the embodiment of the present invention specifically includes:
because polylactic acid is extremely easy to hydrolyze at high temperature, the water content must be strictly controlled, and after the polylactic acid passes through the drying system provided by the embodiment of the invention, the water content of the polylactic acid raw material needs to be controlled below 25ppm so as to prevent the raw material from hydrolyzing, so that the spinning quality is reduced.
Due to poor thermal stability of polylactic acid and overhigh drying temperature, the spinnability is influenced, so when the polylactic acid is dried by the drying system provided by the embodiment of the invention, the crystallization temperature is controlled to be between 85 and 105 ℃, the drying temperature is controlled to be between 85 and 105 ℃, and the polylactic acid is dried for 5 to 20 hours. The quality of the dried polylactic acid raw material is stable, and the smooth spinning can be ensured.
S3 of the embodiment of the present invention specifically includes:
the temperature of the screw extruder provided by the embodiment of the invention is controlled between 170 ℃ and 230 ℃ from the feeding end of the first screw area to the discharging end of the sixth screw area, so that the melt is uniform and stable.
S4 of the embodiment of the present invention specifically includes:
because the polylactic acid raw material in a molten state has poor stability, the number of bits and heads of each line of the spinning assembly are designed, and the melt retention time is strictly controlled to be less than 20 min. Generally, each line does not exceed 4, each position has 16-24 heads, the retention time is too long, the degradation is serious, the spinning production is not facilitated, and the quality of finished yarn is poor.
In the embodiment of the invention, the heat medium pipe of the spinning component adopts low-temperature diphenyl ether with the boiling point of about 200 ℃ as the heat medium, the temperature is controlled to be 200-230 ℃, the heat medium is fully circulated, and the uniform heating is ensured.
S5 of the embodiment of the present invention specifically includes:
the side blowing device provided by the embodiment of the invention adopts a D-shaped air outlet curve to blow air, and the blowing air temperature is 18-22 ℃, so that sufficient and uniform cooling is ensured, and quenching is prevented.
S6 of the embodiment of the present invention specifically includes:
the roller set temperature of the first pair of hot roller sets is 70-100 ℃, the winding time is 4.5-6.5 circles, the roller set temperature of the second pair of hot roller sets is 90-130 ℃, the drafting multiple is 1.3-2.5, and the winding time is 4.5-6.5 circles. Because the polylactic acid has low melting point and poor thermal stability, the setting temperature is not suitable to exceed 130 ℃.
S7 of the embodiment of the present invention specifically includes:
and enabling the FDY part and the POY part to be combined into a main network device for composite grid connection one by one, wherein the main network pressure is 0.4-0.6 mpa.
The speed of the winding machine of the embodiment of the invention needs to be controlled to be 2500-3500 m/min.
The tows produced by the production method have good differential shrinkage effect, wherein the elongation of the POY part tows is 60-100%, and the elongation of the FDY part tows is 25-45%.
The specific application is as follows:
by adopting the production device and the production method, 73dtex/48fPLA polylactic acid differential shrinkage composite fiber is prepared, POY partial tows are 48dtex/30f, FDY partial tows are 25dtex/18f, the molecular weight of the polylactic acid raw material is 210000, the melting point is 175 ℃, and the water content is 21 ppm; heating in 5 zones by adopting a phi 105 screw, wherein the temperature of each zone is as follows: the temperature of the first zone is 178 ℃, the temperature of the second zone is 188 ℃, the temperature of the third zone is 205 ℃, the temperature of the fourth zone is 218 ℃, and the temperature of the fifth zone is 225 ℃; the temperature of a spinning box is 228 ℃, the height of a calm zone is 120mm, the lateral blowing height of a cooling device is 1500mm, the air temperature is 21 ℃, the air speed is 0.35m/s, the specification of a spinneret plate of a spinning assembly is phi 105mm, the section of the spinneret plate is a micropore with a circular section, the temperature of a first pair of hot roll sets is 75 ℃, the speed is 1510m/min, the temperature of a second pair of hot roll sets is 105 ℃, the speed is 2730m/min, the speed of a first godet is 2700m/min, the speed of a second godet is 2720m/min, and the winding speed of a winding machine is 2710 m/min. The obtained finished product differential shrinkage composite fiber has the breaking strength of more than or equal to 2.2cN/dtex, the elongation at break of 46 percent, the boiling water shrinkage of 51.0 percent, the oil content of 0.89 percent and the network degree of 35.
In conclusion, the polylactic acid differential shrinkage composite fiber obtained by the production method of the PLA polylactic acid differential shrinkage composite fiber provided by the invention is soft and fine, has comfortable hand feeling superior to that of polyester differential shrinkage composite yarn, is more suitable for weaving high-quality fabrics, and is beneficial to effective popularization of the PLA polylactic acid differential shrinkage composite fiber.
The following embodiments are provided for the purpose of illustrating the present invention and are not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the technical features of the present invention can be modified or changed in some ways without departing from the scope of the present invention.
Claims (8)
1. The production device of the PLA polylactic acid differential shrinkage composite fiber is characterized by comprising a drying system, a screw extruder, a spinning assembly, a side blowing device, an oiling device, a channel, a drafting assembly, a network device and a winding machine which are sequentially arranged according to a process flow, wherein the drying system comprises a crystallizer and a drying tower, the crystallizer comprises a shell, the top of the shell is provided with a feed inlet, the feed inlet is positioned right below a storage bin, the top of the side part of the shell is provided with a impurity removing port, and the bottom of the shell is provided with at least two air inlets;
introducing hot air through at least two air inlets so as to discharge dust in the polylactic acid raw material falling from the feeding hole from the impurity removing hole;
the side part of the drying tower is provided with at least two air inlets, and drying air is introduced through the at least two air inlets so as to dry the polylactic acid raw material falling into the drying tower and removing dust.
2. The apparatus for producing PLA polylactic acid differential shrinkage composite fiber according to claim 1, wherein the spinning assembly comprises a spinning beam, a melt feeding pipe, a melt distribution pipe, a metering pump and a spinner, wherein:
one end of the melt feeding pipe is connected with the output end of the screw extruder, and the other end of the melt feeding pipe extends into the spinning box body;
the melt distribution pipe, the metering pump and the spinning device are all arranged in the spinning box body;
the number of the melt distribution pipes is two, one end of each melt distribution pipe is connected with the other end of the melt feeding pipe, and each melt distribution pipe is provided with the metering pump;
the spinning ware with the fuse-element distributing pipe one-to-one sets up, the spinning ware includes that the fuse-element carries house steward, melt processor, branch pipe and spinneret, house steward's one end and correspondence are carried to the fuse-element the other end of fuse-element distributing pipe is connected, house steward's the other end is carried to the fuse-element with melt processor connects, the branch pipe is carried to the fuse-element is provided with a plurality ofly, and is a plurality of the branch pipe is carried to the fuse-element with the melt processor connects, the spinneret is provided with a plurality of spinning holes, the spinning hole with branch pipe one-to-one sets up is carried to the fuse-element, the other end of.
3. The device for producing the PLA polylactic acid differential shrinkage composite fiber is characterized in that a suction unit is further arranged between the spinning assembly and the side blowing device, and the suction unit can suck away polylactic acid slices which are not formed into tows.
4. The apparatus for producing PLA polylactic acid differential shrinkage composite fiber according to claim 1 or 3, wherein the side blowing device comprises a blowing box body and an air inlet cylinder, the top of the blowing box body is provided with a plurality of through-wire holes, the bottom of the blowing box body is provided with a through hole and an air net, the air net is arranged on one horizontal side of the through hole, and the air inlet cylinder is arranged below the air net;
the plurality of through hole and the through hole are located in the same vertical direction.
5. The apparatus for producing PLA polylactic acid differential shrinkage composite fiber as claimed in claim 4, wherein the blowing box body has a first side wall, the first side wall is close to the wind net, and the first side wall and the wind net are arranged at an acute angle.
6. The apparatus for producing PLA polylactic acid differential shrinkage composite fiber as claimed in claim 5, wherein a filtering layer is vertically arranged in the blowing box, and the top and the bottom of the filtering layer are respectively connected to the top of the first side wall and the air net.
7. The apparatus for producing PLA polylactic acid differential shrinkage composite fiber according to claim 5, wherein the blowing box further has a second sidewall, the second sidewall is opposite to the first sidewall, and two opposite openable doors are disposed on the second sidewall.
8. The device for producing PLA polylactic acid differential shrinkage composite fiber according to claim 1, wherein the drafting assembly comprises a first drafting unit and a second drafting unit which are connected in parallel, the first drafting unit comprises a pre-interlacer, a first pair of hot roller sets, and a second pair of hot roller sets which are sequentially arranged according to a process flow, and the second drafting unit comprises a first godet and a second godet which are sequentially arranged according to the process flow.
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| CN201920776610.9U CN210237899U (en) | 2019-05-27 | 2019-05-27 | PLA polylactic acid differential shrinkage composite fiber's apparatus for producing |
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