CN111304828B - Preparation method of melt-blown non-woven fabric - Google Patents
Preparation method of melt-blown non-woven fabric Download PDFInfo
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- CN111304828B CN111304828B CN202010305763.2A CN202010305763A CN111304828B CN 111304828 B CN111304828 B CN 111304828B CN 202010305763 A CN202010305763 A CN 202010305763A CN 111304828 B CN111304828 B CN 111304828B
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
- D01D5/092—Cooling filaments, threads or the like, leaving the spinnerettes in shafts or chimneys
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/098—Melt spinning methods with simultaneous stretching
- D01D5/0985—Melt spinning methods with simultaneous stretching by means of a flowing gas (e.g. melt-blowing)
Abstract
The invention relates to the field of masks, in particular to a preparation method of melt-blown non-woven fabric, which comprises the following steps: firstly, heating polypropylene slices into a molten state, extruding the polypropylene slices to a nozzle, spraying the polypropylene slices to a coagulation device through the nozzle, wherein an annular air blowing port with a notch is arranged on the peripheral side of the nozzle, and an air curtain with a notch is formed around the nozzle by the annular air blowing port; secondly, arranging a short fiber spinning device between the nozzle and the coagulation net device and at the gap of the air curtain, and performing superposition spinning on the unset polypropylene fibers by using the short fiber spinning device; and thirdly, arranging an arc-shaped air blowing port below the short fiber spinning device for closing the air curtain with the gap and guiding the composite filaments, and arranging a horizontal shielding air blowing port above the short fiber spinning device to realize that air flow blows to the gap of the air curtain from the outside. Which solves the technical problem of bad effect when the short fiber is added with the hot melt fiber in the prior art.
Description
Technical Field
The invention relates to the field of masks, in particular to a preparation method of melt-blown non-woven fabric.
Background
At present, the melt-blown nonwoven fabric is usually processed by spinning with a melt extrusion mechanism and then forming on a coagulation net mechanism, and polypropylene materials are often used as the original materials. The existing processing equipment for melt-blown non-woven fabrics can refer to Chinese patent numbers: CN200810020638.6 discloses a melt-blown non-woven fabric processing machine, which belongs to the technical field of non-woven machinery and comprises a first machine frame; a melt extrusion mechanism horizontally arranged at the rear end of the first frame for processing plastic particles into hot melt fibers; a short fiber conveying mechanism for guiding short fibers to the front of a spinneret of the melt extrusion mechanism and forcing the short fibers to be converged with hot melt fibers sprayed by the spinneret to form a melt-blown fiber layer, wherein the short fiber conveying mechanism is arranged at the front end of the first frame; and the composite forming mechanism is used for complexing the non-woven fiber cloth with the upper surface and the lower surface of the melt-blown fiber layer to form a melt-blown non-woven fabric finished product, is arranged below the short fiber conveying mechanism and corresponds to the front of the spinneret. The advantages are that: the melt extrusion mechanism, the short fiber conveying mechanism and the composite forming mechanism are reasonable in configuration and simple in structure; the three mechanisms work cooperatively to meet the processing technology requirement of continuous production of melt-blown non-woven fabrics and the production capacity requirement of batch production.
However, the conventional spinneret often has poor effect in the step of combining with short fibers during the ejection, and one is that the short fibers often drive partial air flow during the input, and the partial air flow causes the turbulence of the ejected hot melt fibers, so that the meltblown nonwoven fabric cannot be in a good combination state after being formed; secondly, the thermal melting fiber can generate dissipation, and the dissipation material not only causes the reduction of the working efficiency, but also has a great problem in the recovery, and easily causes the waste of raw materials. In addition, the addition of short fibers presents certain difficulties when hot melt fibers are ejected, because the ejection of hot melt fibers causes the short fibers to be repelled, resulting in inefficient incorporation into the hot melt fibers, which affects the quality of the meltblown nonwoven.
Disclosure of Invention
Therefore, in order to solve the above problems, the present invention provides a method for preparing a melt-blown nonwoven fabric, which solves the technical problem of poor effect when short fibers are added into hot melt fibers in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a preparation method of melt-blown non-woven fabric comprises the following steps:
firstly, heating polypropylene slices in an extruder to be in a molten state, extruding the polypropylene slices to a nozzle, spraying the polypropylene slices to a coagulation device through the nozzle, wherein an annular air blowing port with a notch is arranged on the peripheral side of the nozzle, and an air curtain with a notch is formed around the nozzle by the annular air blowing port;
secondly, arranging a short fiber spinning device between the nozzle and the coagulation net device and at the gap of the air curtain, and performing superposition spinning on the unset polypropylene fibers by using the short fiber spinning device to form composite yarns through compounding;
and thirdly, arranging an arc-shaped air blowing port below the short fiber spinning device for closing the air curtain with the gap and guiding the composite filaments, and arranging a horizontal shielding air blowing port above the short fiber spinning device to realize that air flow blows to the gap of the air curtain from the outside.
Furthermore, in the first step, the nozzle includes an extrusion chamber connected with the extruder, a conical guide chamber connected with the extrusion chamber, a spinning pipeline connected with the conical guide chamber, and a spinning nozzle connected with the spinning pipeline, an arc-shaped expansion chamber is arranged at a position on the spinning pipeline close to the spinning nozzle, an annular body is arranged on the outer side of the circumference of the nozzle, a blowing chamber is formed between the annular body and the nozzle, one end of the annular body is positioned at the spinning nozzle, the other end of the annular body is formed with a wind guide port with the outer side of the nozzle, the wind guide port is connected with external wind pressure equipment to realize air flow introduction, and a conical block is arranged between the annular body and the nozzle on one side close to the spinning nozzle to form an annular blowing port with a notch.
Furthermore, the maximum cross-sectional area of the arc-shaped expansion cavity is 1.2-1.5 times of the cross-sectional area of the spinning pipeline.
Further, the taper angle of the taper block is less than 10 degrees and greater than 5 degrees.
Furthermore, the air blowing cavity is in a conical shape and surrounds the outer side of the circumference of the spinning pipeline, and the included angle between the air blowing cavity and the spinning pipeline is less than 15 degrees.
Furthermore, an arc-shaped recess is formed in the position, located at the annular blowing port, of the nozzle, and the depth of the arc-shaped recess is smaller than 2 mm.
Further, the mesh condensing device comprises a mesh condensing roller, a cooling circulation device arranged on the left side of the mesh condensing roller, and a normal-temperature circulation device arranged on the right side of the mesh condensing roller, wherein a feed inlet is formed between the cooling circulation device and the normal-temperature circulation device above the mesh condensing roller, a discharge outlet is formed between the cooling circulation device and the normal-temperature circulation device below the mesh condensing roller, the cooling circulation device comprises a lower cold air box and an upper return box, the lower cold air box is communicated with external cold air equipment, one end of the lower cold air box, which is close to the mesh condensing roller, is provided with a plurality of cold air outlets, the upper return box is communicated with an external negative pressure device, one end of the upper return box, which is close to the mesh condensing roller, is provided with a plurality of cold air inlets, the normal-temperature circulation box comprises an upper air outlet box and a lower return box, the upper air outlet box is communicated with an external positive pressure device, and the lower return box is communicated with an external negative pressure device, and a plurality of air outlets are formed in one end, close to the condensing screen roller, of the upper air outlet box, and a plurality of air inlets are formed in one end, close to the condensing screen roller, of the lower return box.
Furthermore, a conical material guide hopper is arranged on the feeding hole.
Further, the short fibers are polypropylene short fibers or polyester fibers.
Further, the weight ratio of the polypropylene fiber to the short fiber is 1.8-3: 1.
by adopting the technical scheme, the invention has the beneficial effects that:
1. the scheme utilizes the annular air blowing port to form the air curtain with the gap, and the short fiber spinning device is arranged at the gap of the air curtain, so that the short fibers are more effectively fused into the hot melt fibers. The addition is best when the hot melt fibers are in a form closer to the screen coalescing assembly, but the air curtain is more complete in form closer to the nozzle and looser closer to the screen coalescing assembly, which greatly affects the addition of staple fibers. Even if the air curtain is provided with a notch, the notch is closed as the air curtain is closer to the coagulation net device, so that the short fiber spinning device is arranged between the nozzle and the coagulation net device and is close to the coagulation net devices 1/2 to 1/3, which is a better choice. In addition, after the short fibers are sprayed in, the effect of the air curtain gap is not achieved, and the air curtain gap is left to generate adverse effect at this time, so that the air curtain gap is sealed by the arc-shaped air blowing opening, and the forming of the condensed net is facilitated. Due to the influence of the air flow above, the short fibers tend to fall at the moment of spraying, the addition is not very favorable, and the quality of the generated melt-blown non-woven fabric is not too high, so that partial shielding is realized by utilizing a advective air flow, and the short fibers have certain penetrating force after being sprayed, so that the short fibers enter the interior of the hot-melt fibers, and the quality of the melt-blown non-woven fabric is favorably improved. The advection's air flow intensity is a small air flow that is adjusted according to the air curtain in order not to destroy the overall structure of the air curtain, and is usually set to 1/3-1/4 of the air curtain's pressure. The melt-blown fabric formed in this way can be added with more short fibers, so that the cost is effectively reduced, the quality of the product basically reaches the level of the conventional melt-blown non-woven fabric, and the weight ratio of the short fibers to the polypropylene fibers can reach 1: 1.8-3, which is of course a preferred ratio, it is also possible to increase the specific gravity of the polypropylene fibres.
2. The arrangement of the nozzle, particularly the arrangement of the arc-shaped expansion cavity, aims to give a certain stirring effect to the material to be sprayed, so that the sprayed hot-melt fiber filaments have stronger diffusivity, and therefore, the aim of more dispersion is fulfilled, and better filament-shaped superposed melt-blown non-woven fabric is formed. However, this is a disadvantage in itself, and it is not easy to control, scatter, etc. due to the increase of the diffusibility, but this defect can be compensated by the effective arrangement of the ring-shaped air blowing opening, and due to the arrangement of the ring-shaped air blowing opening, the gap of the air curtain is arranged, so that the addition of the short fibers is effectively realized. The air curtain notch is formed by the conical blocks, so that the air curtain notch formed theoretically can be in a state of being small at the top and large at the bottom, but due to the factor of weakening wind, the air curtain notch can be scattered and closed at the lower end gradually.
3. The maximum cross-sectional area of the arc-shaped expansion cavity is 1.2-1.5 times of the cross-sectional area of the spinning pipeline, and the arc-shaped expansion cavity is not suitable for being too large, so that raw materials are easily in a burst state due to the fact that the arc-shaped expansion cavity is too large, and smooth production is not suitable for being carried out.
4. As described above, due to the wind weakening factor, the gap of the wind curtain is gradually scattered and closed at the lower end, and at this time, the angle of the taper angle is controlled, and the proper wind pressure is matched, so that a more reasonable gap state can be formed. The wind pressure for forming the air curtain in the scheme can be selected from 0.3-0.45 MPa, the conical angle can be selected from 5-15 degrees, and the specific implementation in the scheme adopts (0.3MPa, 5 degrees), (0.32MPa, 6 degrees), (0.35MPa, 7 degrees), (0.38MPa, 8 degrees), (0.4MPa, 10 degrees), (0.42MPa, 12 degrees), (0.45MPa, 15 degrees), and the generated effects are basically similar.
5. The arc-shaped recess can effectively realize slight outward turning of the wind pressure, and the arrangement aims to prevent the influence of the inclined wind curtain on hot melt fibers without influencing the formation of the wind curtain.
6. The setting of netting device congeals, its aim at effectively realize congealing effective shaping of net and effectively break away from, form better melt-blown non-woven fabrics. Through the cooling circulation case of cold air box, last backward flow case formation down, its aim at makes the temperature reduction of condensing the net roller to effectively take over hot melt fibre after rotating, can effectively realize melt-blown non-woven fabrics like this and change in breaking away from, also make hot melt fibre condense solidification sooner, thereby effectively improve the quality, also lie in effectively taking away partial heat. The normal-temperature circulating box formed by the upper gas outlet box and the lower return box aims to take away hot gas and air flow so as not to influence the effective forming of the coagulation net. The size of the air flow should not be too large to prevent the damage to the condensation net, and the size should be adjusted according to the actual size, air temperature and other conditions. In the scheme, the temperature of the cold air is 10-15 ℃, and the temperature can be other temperatures. In addition, a material guide hopper is arranged at the position of the feeding port, and the direction of the air curtain can be positioned in the material guide hopper, so that the operation of forming the condensation net is facilitated.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the cone block cooperating with the nozzle;
FIG. 3 is a schematic view of the arrangement of the staple fiber spinning device in cooperation with an air curtain;
fig. 4 is an enlarged view at a in fig. 1.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and detailed description.
Referring to fig. 1 to 4, the embodiment provides a melt-blown non-woven fabric forming apparatus, including an extruder (not shown in the figure), a nozzle 1 disposed at the front end of the extruder, and a coagulation device 2, wherein a short fiber spinning device 3 is disposed between the nozzle 1 and the coagulation device 2, and the extruder and the short fiber spinning device are conventional devices and are not described herein again. An arc-shaped air blowing port 31 is arranged below the short fiber spinning device 3, the arc-shaped air blowing port 31 points to the coagulation net device 2, a horizontal shielding air blowing port 32 is arranged above the short fiber spinning device 3, the arc-shaped air blowing port 31 is communicated with external positive pressure equipment, and the horizontal shielding air blowing port is communicated with air blowing equipment. The nozzle 1 comprises an extrusion cavity 11 connected with an extruder, a conical guide cavity 12 connected with the extrusion cavity 11, a spinning pipeline 13 connected with the conical guide cavity 12, and a spinning nozzle 14 connected with the spinning pipeline 13, wherein an arc-shaped expansion cavity 131 is arranged at a position, close to the spinning nozzle, on the spinning pipeline 13, a ring-shaped body 4 is arranged on the outer side of the circumference of the nozzle 1, a blowing cavity 41 is formed between the ring-shaped body 4 and the nozzle 1, one end of the ring-shaped body 4 is located at the spinning nozzle 14, the other end of the ring-shaped body 4 and the outer side of the nozzle 1 form a wind guide opening 42, the wind guide opening 42 is connected with external wind pressure equipment to realize air flow introduction, a conical block 5 is arranged on one side, close to the spinning nozzle 14, between the ring-shaped body 4 and the nozzle 1 to form an annular blowing opening 51 with a gap, and an air curtain 52 can be formed after the annular blowing opening 51 is blown out. An arc-shaped recess 15 is formed in the position, located at the annular air blowing port 51, of the nozzle 1, the depth of the arc-shaped recess 15 is smaller than 2mm, and the arc-shaped recess 15 is set to be 1.5 mm.
The maximum cross-sectional area of the arc-shaped expansion cavity 131 is 1.2-1.5 times of the cross-sectional area of the spinning pipeline 13, and the scheme is 1.3 times. The taper angle of the tapered block 5 is smaller than 10 degrees and larger than 5 degrees, and the taper angle is 8 degrees. The air blowing cavity 41 is in a conical shape and surrounds the outer side of the circumference of the spinning pipeline 13, the included angle between the air blowing cavity 41 and the spinning pipeline 13 is less than 20 degrees, and 15 degrees is selected in the scheme.
The mesh condensing device 2 comprises a mesh condensing roller 21, a cooling circulation device arranged on the left side of the mesh condensing roller 21, and a normal temperature circulation device arranged on the right side of the mesh condensing roller 21, wherein a feed inlet 22 is formed between the cooling circulation device and the normal temperature circulation device above the mesh condensing roller, a discharge outlet 23 is formed between the cooling circulation device and the normal temperature circulation device below the mesh condensing roller 21, the cooling circulation device comprises a lower cold air box 24 and an upper return box 25, the lower cold air box 24 is communicated with external cold air equipment, one end of the lower cold air box 24 close to the mesh condensing roller is provided with a plurality of cold air outlets 241, the upper return box 25 is communicated with an external negative pressure device, one end of the upper return box 25 close to the mesh condensing roller is provided with a plurality of cold air inlets 251, the normal temperature circulation box comprises an upper air outlet box 26 and a lower return box 27, the upper air outlet box 26 is communicated with the external positive pressure device, the lower return box 27 is communicated with the external negative pressure device, a plurality of air outlets 261 are arranged at one end of the upper air outlet box 26 close to the screen condensing roller, and a plurality of air inlets 271 are arranged at one end of the lower return box 27 close to the screen condensing roller. A conical material guide hopper 221 is arranged on the feeding hole 22.
Based on the melt-blown non-woven fabric forming device, the preparation method of the melt-blown non-woven fabric comprises the following steps:
the first step, polypropylene slices are heated in an extruder to be in a molten state and then extruded to a nozzle, and then the polypropylene slices are sprayed out through a spinneret orifice to be sprayed to a coagulation net device, an annular air blowing port with a notch is arranged on the peripheral side of the nozzle, and an air curtain with a notch is formed around the nozzle by the annular air blowing port;
secondly, arranging a short fiber spinning device between the nozzle and the coagulation net device and at the gap of the air curtain, and performing superposition spinning on the unset polypropylene fibers by using the short fiber spinning device to form composite yarns through compounding;
thirdly, arranging an arc-shaped air blowing opening below the short fiber spinning device for closing an air curtain with a gap and guiding the composite filaments, and arranging a horizontal shielding air blowing opening above the short fiber spinning device for blowing air flow to the gap of the air curtain from outside;
fourthly, the lower cold air box releases cold air, and the upper return box carries out cold air backflow, so that the temperature of the condensing net roller is reduced;
and fifthly, releasing air flow by the upper air outlet box, and refluxing air flow by the lower reflux box, so that air flow blocking at the position of the coagulation screen roller is realized, the forming is facilitated, and the influence of the air flow on hot melting fibers is also prevented.
And sixthly, outputting the formed net.
The air pressure and temperature in the above steps are not much different from those in the prior art, and can be adjusted according to actual needs, which are well known and not described herein. Reference may be made to chinese patent No.: 201810530723.0, or Chinese patent No.: 200810119520.9 discloses a superfine melt-blown non-woven fabric mixed material, a melt-blown non-woven fabric prepared from the same and a manufacturing method thereof, or Chinese patent numbers: CN201280006732.0 discloses a meltblown nonwoven fabric composed of ultra fine fibers, a method for producing the meltblown nonwoven fabric, and an apparatus for producing the meltblown nonwoven fabric.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The preparation method of the melt-blown non-woven fabric is characterized by comprising the following steps:
firstly, heating polypropylene slices in an extruder to be in a molten state, extruding the polypropylene slices to a nozzle, spraying the polypropylene slices to a coagulation device through the nozzle, wherein an annular air blowing port with a notch is arranged on the peripheral side of the nozzle, and an air curtain with a notch is formed around the nozzle by the annular air blowing port;
secondly, arranging a short fiber spinning device between the nozzle and the coagulation net device and at the gap of the air curtain, and performing superposition spinning on the unset polypropylene fibers by using the short fiber spinning device to form composite yarns through compounding;
and thirdly, arranging an arc-shaped air blowing port below the short fiber spinning device for closing the air curtain with the gap and guiding the composite filaments, and arranging a horizontal shielding air blowing port above the short fiber spinning device to realize that air flow blows to the gap of the air curtain from the outside.
2. The method for preparing a melt-blown nonwoven fabric according to claim 1, characterized in that: in the first step, the nozzle comprises an extrusion cavity connected with an extruder, a conical guide cavity connected with the extrusion cavity, a spinning pipeline connected with the conical guide cavity, and a spinning nozzle connected with the spinning pipeline, wherein an arc-shaped expansion cavity is arranged at a position, close to the spinning nozzle, on the spinning pipeline, an annular body is arranged on the outer side of the circumference of the nozzle, a blowing cavity is formed between the annular body and the nozzle, one end of the annular body is positioned at the spinning nozzle, the other end of the annular body and the outer side of the nozzle form a wind guide opening, the wind guide opening is connected with external wind pressure equipment to achieve air flow introduction, and a conical block is arranged between the annular body and the nozzle on one side close to the spinning nozzle to form an annular blowing opening with a notch.
3. The method for preparing a melt-blown nonwoven fabric according to claim 2, characterized in that: the maximum cross-sectional area of the arc-shaped expansion cavity is 1.2-1.5 times of the cross-sectional area of the spinning pipeline.
4. The method for preparing a melt-blown nonwoven fabric according to claim 2, characterized in that: the taper angle of the tapered block is less than 10 degrees and greater than 5 degrees.
5. The method for preparing a melt-blown nonwoven fabric according to claim 2, characterized in that: the air blowing cavity is in a conical shape and surrounds the outer side of the circumference of the spinning pipeline, and the included angle between the air blowing cavity and the spinning pipeline is less than 15 degrees.
6. The method for preparing a melt-blown nonwoven fabric according to claim 5, wherein: an arc-shaped recess is formed in the position, located at the annular blowing port, of the nozzle, and the depth of the arc-shaped recess is smaller than 2 mm.
7. The method for preparing a melt-blown nonwoven fabric according to claim 1, characterized in that: the mesh condensing device comprises a mesh condensing roller, a cooling circulating device arranged on the left side of the mesh condensing roller, and a normal-temperature circulating device arranged on the right side of the mesh condensing roller, wherein a feed inlet is formed between the cooling circulating device and the normal-temperature circulating device above the mesh condensing roller, a discharge outlet is formed between the cooling circulating device and the normal-temperature circulating device below the mesh condensing roller, the cooling circulating device comprises a lower cold air box and an upper return box, the lower cold air box is communicated with external air conditioning equipment, one end of the lower cold air box, which is close to the mesh condensing roller, is provided with a plurality of cold air outlets, the upper return box is communicated with the external positive pressure device, the lower return box is communicated with the external negative pressure device, one end of the upper return box, which is close to the mesh condensing roller, is provided with a plurality of air outlets, and one end of the lower return box, which is close to the screen condensing roller, is provided with a plurality of air inlets.
8. The method for preparing a melt-blown nonwoven fabric according to claim 7, wherein: and a conical material guide hopper is arranged on the feeding hole.
9. A method of manufacturing a meltblown nonwoven according to any of claims 1 to 8, characterised in that: the short fiber is polypropylene short fiber or polyester fiber.
10. A method of manufacturing a meltblown nonwoven according to any of claims 1 to 8, characterised in that: the weight ratio of the polypropylene fiber to the short fiber is 1: 1.5-2.
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| CN202110966971.1A CN113584722B (en) | 2020-04-17 | 2020-04-17 | Forming process of melt-blown non-woven fabric |
| CN202010305763.2A CN111304828B (en) | 2020-04-17 | 2020-04-17 | Preparation method of melt-blown non-woven fabric |
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| CN112411017B (en) * | 2020-11-26 | 2021-10-22 | 浦江海工机械有限公司 | Processing and production process of melt-blown non-woven fabric |
| CN112695457A (en) * | 2020-12-18 | 2021-04-23 | 无锡艾度科技有限公司 | Cooling device and process for reducing melt-blown fabric resistance |
| CN115155847A (en) * | 2022-07-18 | 2022-10-11 | 东南大学 | Short fiber spray head for interlaminar toughening of composite material |
| CN115748099B (en) * | 2022-12-12 | 2024-01-26 | 禾欣可乐丽超纤(海盐)有限公司 | Preparation device of elastic nonwoven material |
| CN117431650B (en) * | 2023-12-21 | 2024-02-27 | 山东建通工程科技有限公司 | Spinning device and spinning method for spinning |
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| CN113584722B (en) | 2022-08-05 |
| CN111304828A (en) | 2020-06-19 |
| CN113584722A (en) | 2021-11-02 |
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