CN210237846U - Production device of PLA polylactic acid wool-like fiber - Google Patents

Abstract

The utility model relates to a production device of PLA polylactic acid wool-like fiber. The production device comprises a drying system, a screw extruder, a spinning assembly, a side blowing device, a channel, an oiling device, a drafting assembly, a network device and a winding machine which are sequentially arranged according to the process flow. The section of a spinneret orifice of the spinning assembly in the filament outlet direction comprises N strip-shaped holes, N-1 strip-shaped holes in the N strip-shaped holes are arranged in parallel, another strip-shaped hole in the N strip-shaped holes is communicated with the middle of the N-1 strip-shaped holes, and N is more than or equal to 5. The utility model discloses be favorable to the fibrous effective popularization of imitative hair of PLA polylactic acid.

Description

Production device of PLA polylactic acid wool-like fiber

Technical Field

The utility model belongs to the technical field of weaving chemical fiber production, especially, relate to a production device of PLA polylactic acid imitated wool fiber.

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.

In the prior art, wool-like fibers are mainly prepared from polybutylene terephthalate (PBT). However, the wool-like fibers made of the material are difficult to degrade in soil and are easy to pollute the environment once being discarded at will, so that the production of the wool-like fibers by adopting polylactic acid is a routine proposal.

In the prior art, wool-like fibers are mainly prepared from polyamide or polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) and the like. However, the wool-like fibers made of these materials are difficult to degrade in soil and are easily polluted once being discarded, so that the production of the wool-like fibers by using polylactic acid is a popular way.

At present, the domestic production of polylactic acid wool-like fibers is not multiple in technical methods, the technical capability is limited, and the produced polylactic acid wool-like fibers have poor quality, so that the effective popularization of products is hindered.

SUMMERY OF THE UTILITY MODEL

To the problem that above-mentioned prior art exists, the utility model provides a production method of PLA polylactic acid imitative hair fibre to solve among the prior art imitative hair fibre by the problem of the environmental pollution that preparation such as polyamide or polyethylene terephthalate or polybutylene terephthalate caused, and do benefit to the effective popularization of polylactic acid imitative hair fibre.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

the utility model provides a production device of PLA polylactic acid imitative wool fibre, production device includes drying system, screw extruder, spinning subassembly, cross-air blower, corridor, the device of oiling, drafting subassembly, networker and the winder that sets gradually according to process flow, wherein, the spinneret orifice of spinning subassembly is in the ascending cross-section of silk side of play including N bar hole, N-1 bar hole in N bar hole sets up side by side, another bar hole intercommunication in N bar hole the middle part in N-1 bar hole, N more than or equal to 5.

Further, the drying system comprises a crystallizer and a drying tower, the crystallizer comprises a shell, a feed inlet is formed in the top of the shell and is located right below the storage bin, a impurity removing port is formed in the top of the side portion of the shell, and at least two air inlets are formed in the top of the shell;

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 device comprises a suction device, wherein the suction device is arranged between the spinning assembly and the side blowing device to suck spinning monomers away.

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 air blowing box body, and the top and the bottom of the filtering net are respectively connected to the top of the first side wall and the air net.

Furthermore, the filter layer is 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.

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.

Furthermore, the drafting assembly comprises a pre-network device, a first pair of hot roller sets, a second pair of hot roller sets and a tension adjusting godet which are sequentially arranged according to the process flow.

The utility model has the advantages that:

the utility model provides a production device of PLA polylactic acid imitated wool fiber, earlier dry polylactic acid raw materials through drying system, polylactic acid raw materials after drying gets into screw extruder and carries out the melt compression afterwards, during the polylactic acid raw materials after the melt compression got into spinning subassembly, through spinning subassembly blowout silk bundle, the silk bundle cools off through cross air blower, corridor and the device that oils afterwards, guarantee abundant even cooling, prevent the quench, then the silk bundle is after the draft is tensile, get into the main network ware after, get into the winder again and roll into the spinning cake.

Because the utility model discloses a spinneret orifice of spinning pack is in the ascending cross-section of silk side of going out including N bar hole, and N-1 bar hole in N bar hole sets up side by side, and another bar hole intercommunication N-1 bar hole's middle part in N bar hole, N more than or equal to 4, pass through like this the utility model provides a similar N festival caterpillar in the fibrous cross-section of imitative hair made of PLA polylactic acid imitative hair fibrous production method, there is the effect of cashmere or hair, feels, the comfort level more is close cashmere or silk, just, because this imitative fibrous material of wool has natural degradation nature, can not cause the pollution to the environment because polylactic acid, thereby is favorable to PLA polylactic acid imitative hair fibrous 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 apparatus for PLA polylactic acid wool-like 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 cross-sectional view of the spinning orifice of the spin pack of FIG. 1;

FIG. 4 is a schematic cross-sectional view of a filament bundle produced using the spinning orifice shown in FIG. 3;

FIG. 5 is another schematic cross-sectional view of the spinning orifices of the spin pack of FIG. 1;

FIG. 6 is a schematic cross-sectional view of a filament bundle produced using the spinning orifice shown in FIG. 5;

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 method for producing PLA polylactic acid wool-like fibers 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.

First, the embodiment of the utility model discloses PLA polylactic acid imitates fibrous apparatus for producing of hair.

Fig. 1 is the structure schematic diagram of the production device of PLA polylactic acid wool-like fiber of the embodiment of the present invention, see fig. 1, the device includes a drying system 1, a screw extruder 2, a spinning component 3, a suction device 4, a side blowing device 5, a channel 6, an oiling device 7, a drafting component, a network device 12 and a winding machine 13 which are arranged in sequence according to the process flow.

Fig. 2 is the schematic structural diagram of the drying system of fig. 1, and with reference to fig. 2, the drying system 1 of the embodiment of the present invention includes a crystallizer 1.1 and a drying tower 1.2, wherein the crystallizer 1.1 includes a casing, the top of the casing is provided with a feed inlet 1.11, the feed inlet 1.11 is located under the bin a, the top of the side portion of the casing is provided with a impurity removing opening 1.12, and the bottom of the casing is provided with at least two air inlets 1.13. 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 utility model, can introduce hot-blast crystallizer 1 through forced draught blower and pipeline.

Further, combine fig. 2, the utility model discloses drying tower 1.2's of embodiment lateral part is provided with two at least air inlets 1.21, introduces dry air through two at least air inlets 1.21 to the polylactic acid raw materials after will falling into the drying tower and get rid of the dust is dried.

Because the embodiment of the utility model provides a drying tower 1.2 has also set up two air inlets 1.21, can carry more dry air through the air pump to make the drying effect of polylactic acid raw materials more even stable.

The embodiment of the utility model provides an in, screw extruder 2 can choose for use novel alloy to cover formula and bake the special screw extruder of bimetal that penetrates the technology and handle, takes the mixing head of pin, and draw ratio 25, it has a screw rod district feed end to six district discharge ends, can guarantee like this that the fuse-element is even stable.

In the embodiment of the utility model, the plate diameter of the spinneret plate of spinning pack 3 is 80 ~ 105mm, and the section of spinneret orifice in the silk direction of going out includes N bar hole, and N-1 bar hole in N bar hole sets up side by side, and another bar hole intercommunication N-1 bar hole's middle part in N bar hole, N more than or equal to 5.

Fig. 3 is a schematic cross-sectional view of the spinning holes of the spinning pack in fig. 1, and in combination with fig. 3, the cross section of the spinning hole in the filament outlet direction has 5 bar holes, 4 bar holes are arranged in parallel, and the other bar hole is communicated with the middle of the 4 bar holes.

Referring to fig. 3, the two outermost holes of the 4 bar-shaped holes are arranged at two ends of the other bar-shaped hole, i.e. the section of the spinneret hole in the filament outlet direction forms a 'king' shape with 4 transverse lines. Fig. 4 is a schematic cross-sectional view of the filament bundle produced by using the spinning holes shown in fig. 3, and as shown in fig. 4, the cross-section of the filament bundle produced by using the spinneret hole of the king type having 4 transverse lines is similar to that of four-knot caterpillars, and has the effect of cashmere or wool.

Fig. 5 is another schematic cross-sectional view of the spinning orifices of the spin pack of fig. 1, which differs from that shown in fig. 3 in that: has 5 strip-shaped holes arranged in parallel to form a king shape with 5 transverse lines. FIG. 6 is a schematic cross-sectional view of the filament bundle produced by using the spinning holes shown in FIG. 5, and in combination with FIG. 6, the cross-section of the filament bundle produced by using the "king" type spinning holes with 5 transverse lines is similar to five-knot caterpillars, and has the effect of cashmere or wool

Therefore, through the utility model discloses its feeling of silk bundle that spinneret orifice produced, comfort level are closer cashmere or silk, accord with operation requirement.

Further, the embodiment of the utility model provides an in, spinning subassembly adopts the low temperature diphenyl ether of boiling point about 200 ℃ to make heat medium system, and control temperature is 200 ~ 230 ℃. The heating medium system heats the spinning box and the extrusion head, so that the heating medium is circulated fully, and the heating uniformity is ensured.

The utility model discloses suction device 4 sets up in spinning component 3's below for with the spinning monomer siphoning away, in order to avoid influencing going on of follow-up technology, and guarantee the quality of silk bundle.

The utility model discloses suction device 4 can adopt circulating water negative pressure suction to fully take out the monomer.

Fig. 7 is the schematic structure diagram of the side blast apparatus in fig. 1, and fig. 8 is the schematic side view of fig. 7, combines fig. 7 and fig. 8, the utility model discloses a side blast apparatus 5 is including blowing box 5.1, an air inlet section of thick bamboo 5.2, and blowing box 5.1 top is provided with a plurality of through-filament holes, and this through-filament hole and spinning pack's spinning hole one-to-one sets up, and blowing box 5.1 bottom is provided with clearing hole and net 5.3, and net 5.3 sets up in the horizontal one side of clearing hole, and air inlet section of thick bamboo 5.2 sets up in the below of net 5.3, and a plurality of through-filament holes and clearing hole are located 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.

With reference to fig. 7, in the embodiment of the present invention, the suction device 4 may include a suction tube, one end of the suction tube is located in the blowing box 5.1, one end of the suction tube is open, and the other end of the suction tube is located outside the blowing box 5.1, so as to suck the spinning monomers from the open end to the outside of the blowing box 5.1 for collection.

With reference to fig. 7 and 8, the blowing box 5.1 of the embodiment of the present 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 the cooling wind more efficiently and realize the rapid cooling of the filament bundle.

Combine fig. 7 and fig. 8, the utility model discloses along vertical filter layer 5.4 that is provided with in the blow box 5.1 of embodiment, the top and the bottom of filter layer 5.4 are connected respectively on the top of lateral wall 5.11 and wind net 5.3, and the filter layer can filter the cooling air that directly carries out the heat exchange with the silk bundle, avoids having twine impurity on the silk bundle of high temperature state, influences the quality of silk bundle.

The embodiment of the utility model provides an in, filter layer 5.4 can set up in air inlet box 5.1 with inserting, not only can filter the cooling air that gets into in the box of blowing like this, guarantees the production quality of silk bundle, can also regularly carry out the dismouting to the filter screen and wash, guarantees that the cooling air passes through smoothly.

Further, the utility model discloses filter layer 5.4 can be formed by combining along the level to porous filter, filter screen and the honeycomb panel that sets gradually in the box, can be from outer to interior impurity filtration to equidimension not like this.

Further, combine fig. 7 and 8, the utility model discloses blow box 5.1 of embodiment has second lateral wall 5.12, and this second lateral wall 5.12 and first lateral wall 5.11 set up relatively, are provided with two relative doors 5.13 that can open on second lateral wall 5.12, not only can observe the box is inside to when phenomenons such as the silk bundle knot appears in the inside of box, can operate the silk bundle.

The embodiment of the utility model provides a owing to adopt the forced air cooling mode to cool off the silk bundle, not only can improve the cooling effect of silk bundle, can also improve equipment's spinning speed, improve the output of finished product fibre silk bundle.

Further, combine fig. 7, in the embodiment of the utility model, the blowing box 5.1 is highly for blowing the district with filter layer 5.4 correspondence, and its height is 1600 ~ 2200mm to D type air-out curve, in order to guarantee abundant even cooling, prevents the quench, and blowing box 5.1 is the calm zone in the height that spinning box below of spinning subassembly corresponds, and its height is 90 ~ 130mm, and this is because, calm zone height can directly influence the silk bundle quality, the utility model discloses the setting of calm zone height can avoid the temperature drop too fast, causes the phenomenon that the silk quality is poor.

The embodiment of the utility model provides an in 6 passageways that are the silk bundle and pass through naturally for make the stable passing through of silk bundle after the cooling, guarantee that the air steady state flows in the passageway, prevent the silk strip shake, its length can specifically set up as required.

Further, the embodiment of the utility model provides an in 7 device that oils for the glib talker system that oils, use prevent splashing, low friction, wear-resisting glib talker oils, and the evenness is stable like this, guarantees the dyeing homogeneity. Because the oiling device 7 of the embodiment of the utility model is positioned below the channel 6, enough tension is provided before the tows enter the drafting part.

With reference to fig. 1, in the embodiment of the present invention, the drafting assembly includes a pre-networking device 8, a first pair of hot roller sets 9, a second pair of hot roller sets 10, and a tension adjusting godet 11, which are sequentially arranged according to a process flow.

The utility model discloses the silk bundle passes through behind the corridor 7, gets into earlier and adds the net point in advance in the net ware 8, can make the silk bundle knot like this, further reduces the broken end rate.

Among the prior art, every in the draft subassembly is usually for cold roll and the mutual collocation use of hot-rolling, has caused like this that the stretch-draw to the fibre silk bundle is insufficient, is heated unevenly, causes the physical properties of fibre silk bundle to differ great, and breaking strength is low, can not satisfy the requirement of later process, the embodiment of the utility model provides an improve to this.

The embodiment of the utility model provides an in, first pair of hot roller set 9 and second pair of hot roller set 10 constitute by two hot-rollers to can make fibre silk bundle extension and inner structure can be stable, eliminated its inside draft stress effectively, improve the shape stability of fibre silk bundle, and improve the breaking strength of fibre silk bundle, reduce the broken end rate of fibre silk bundle.

After passing through the drafting assembly, the tow enters a main network 12 to be screened, and then is wound into a cake by a winding machine 13. The utility model discloses winder 13 mode of traversing is the precision winding mode, and winder speed is 2500 ~ 3500 m/min.

In addition, based on the fibrous apparatus for producing of the imitative hair of above-mentioned PLA polylactic acid, the embodiment of the utility model provides a production method of the imitative hair fibre of PLA polylactic acid still is provided.

Fig. 9 is a schematic flow chart of a production method of PLA polylactic acid wool-like fiber according to an embodiment of the present invention, and with reference to 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 tows through a spinning assembly;

s5: the tows are cooled through a lateral blowing device and a channel in sequence;

s6: after oiling treatment is carried out on the cooled tows by an oiling device, the cooled tows are stretched by a drawing assembly;

s7: and (4) after the drawn and stretched tows enter a main network device, the tows enter a winding machine to be wound into a spinning cake.

The utility model discloses S1 specifically includes:

the utility model discloses the preferred spinning level PLA polylactic acid section of polylactic acid raw materials, average molecular weight is 200000 ~ 300000, and melting point 173-.

The utility model discloses S2 specifically includes:

because polylactic acid is very easy high temperature hydrolysis, must strictly control the moisture content, through the utility model discloses behind the drying system, need control the moisture content of polylactic acid raw materials below 25ppm to prevent that the raw materials from hydrolysising, cause the spinning quality to descend.

Because polylactic acid thermal stability is poor, and the too high spinnability that influences of drying temperature, consequently, through the utility model discloses during drying system, crystallization temperature control is between 85 ℃ -105 ℃, and drying temperature control is between 85 ℃ -105 ℃, and dry 5 ~ 20 hours. The quality of the dried polylactic acid raw material is stable, and the smooth spinning can be ensured.

The utility model discloses S3 specifically includes:

the utility model discloses screw extruder's a district feed end of screw rod is between 170 ℃ -230 ℃ to six district discharge end temperature control to guarantee that the fuse-element is even stable.

The utility model discloses S4 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. If the retention time is too long, the degradation is serious, the spinning production is not facilitated, and the quality of the finished yarn is poor.

The embodiment of the utility model provides an in, spinning subassembly's heat medium pipe adopts the low temperature diphenyl ether about boiling 200 ℃ to do the heat medium, and control temperature 200 ~ 230 ℃ to make the heat medium circulation abundant, ensure that the heating is even.

The utility model discloses S5 specifically includes:

the utility model discloses side blast apparatus adopts D type air-out curve to supply air, and the air supply temperature is 18 ~ 22 ℃ to guarantee abundant even cooling, prevent the quench.

The utility model discloses S6 specifically includes:

the utility model discloses the draft subassembly adopts one step of draft, and the hot-roller temperature of first pair of hot roller set is 80 ℃ -100 ℃, and 4.5 ~ 6.5 circles of winding, and the roller set temperature of second pair of hot roller set is 90 ℃ -120 ℃, and the draft multiple 1.5 ~ 2.5, 4.5 ~ 6.5 circles of winding, because polylactic acid melting point is low, the thermal stability is poor, and the design temperature should not exceed 130 ℃.

The drawing multiple of the filament bundle entering the tension adjusting godet is 0.95-1.0.

The utility model discloses S7 specifically includes:

and enabling the tows to enter a main network device to enter a network, wherein the speed of a winding machine is 2500-3500 m/min.

The specific application is as follows:

by adopting the production device and the production method, the 40dtex/12fPLA polylactic acid wool-like fiber is prepared. The molecular weight of the PLA polylactic acid slices is 220000, the melting point is 176 ℃, and the water content of the dry slices is 21 ppm; adopting a phi 85 screw, wherein each line (each screw) has 2 bits, each bit has ten ends, the length-diameter ratio is 25, heating is carried out in five regions, and the temperature of each region is as follows: the temperature of a first area is 190 ℃, the temperature of a second area is 210 ℃, the temperature of a third area is 220 ℃, the temperature of a fourth area is 225 ℃, and the temperature of a fifth area is 228 ℃; the temperature of the spinning box is 228 ℃, the cross-blow height of the cooling device is 1600mm, the wind temperature is 19 ℃, the wind speed is 0.4m/s, the specification of the spinneret plate is phi 95, and the section of the micropore is king. The temperature of the first pair of hot roller sets is 80 ℃, the temperature of the second pair of hot roller sets is 110 ℃, the stretching ratio is 2.1, and the winding speed is 3300 m/min. The breaking strength of the spun finished yarn is more than or equal to 3.9cN/dtex, the breaking elongation is 28 percent, and the oil content is 1.17 percent.

In conclusion, through the utility model provides a imitative wool fibre that PLA polylactic acid imitative wool fibre's production method made feels, the comfort level more is close cashmere or silk, is favorable to the effective popularization of PLA polylactic acid imitative wool fibre.

The following embodiments are preferred embodiments of the present invention, which are only used to facilitate the description of the present invention, and are not intended to limit the present invention in any form, and any person who knows commonly in the art can use the present invention to make local changes or modifications within the scope of the technical features of the present invention, and the technical features of the present invention are not separated from the present invention.

Claims (9)

1. The production device of the PLA polylactic acid wool-like fiber is characterized by comprising a drying system, a screw extruder, a spinning assembly, a side blowing device, a corridor, an oiling device, a drafting assembly, a network device and a winding machine which are sequentially arranged according to a process flow, wherein the cross section of a spinneret orifice of the spinning assembly in the filament outlet direction comprises N strip-shaped holes, N-1 strip-shaped holes in the N strip-shaped holes are arranged in parallel, the other strip-shaped hole in the N strip-shaped holes is communicated with the middle of the N-1 strip-shaped holes, and N is more than or equal to 5.

2. The production device of PLA polylactic acid wool-like fiber according to claim 1, 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 top 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.

3. The apparatus for producing PLA polylactic acid wool-like fiber according to claim 1, further comprising a suction device disposed between the spinning assembly and the side blowing device to suck the spinning monomer away.

4. The production device of PLA polylactic acid wool-like fibers according to any one of claims 1 to 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 through holes and an air net, 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.

5. The apparatus for producing PLA polylactic acid wool-like fiber according to 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 production device of PLA polylactic acid wool-like fiber according to claim 5, wherein a filter layer is vertically arranged in the blowing box, and the top and the bottom of the filter layer are respectively connected to the top of the first side wall and the air net.

7. The apparatus for producing PLA polylactic acid wool-like fiber according to claim 6, wherein the filter layer is formed by combining a porous filter plate, a filter screen and a honeycomb plate which are arranged in the tank body in sequence along the horizontal direction.

8. The apparatus for producing PLA polylactic acid wool-like fiber according to claim 6, wherein the blowing box further has a second side wall, the second side wall is opposite to the first side wall, and two opposite openable doors are arranged on the second side wall.

9. The production device of PLA polylactic acid wool-like fiber according to claim 1, wherein the drafting assembly comprises a pre-network device, a first pair of hot roller sets, a second pair of hot roller sets and a tension adjusting godet which are arranged in sequence according to the process flow.

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