CN114457432A - Air flow self-coupling melt-blowing die head for nanofiber preparation device - Google Patents
Air flow self-coupling melt-blowing die head for nanofiber preparation device Download PDFInfo
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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
- D01D4/00—Spinnerette packs; Cleaning thereof
- D01D4/02—Spinnerettes
- D01D4/025—Melt-blowing or solution-blowing dies
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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
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- D01D4/02—Spinnerettes
- D01D4/027—Spinnerettes containing inserts
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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)
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Abstract
The invention discloses an air flow self-coupling melt-blowing die head for a nanofiber preparation device, and belongs to the technical field of melt-blowing equipment. A nanofiber preparation facilities is with the jet self-coupling melt-blown die head, there are spinneret orifices in the middle block of said spray nozzle, set up the first air current channel between side block of said spray nozzle and the middle block of said spray nozzle, connect with the spacer in the said first air current channel, there is the second air current channel in the side block of said spray nozzle; the melt-blown die head for preparing the nano fibers with the airflow self-coupling function, provided by the invention, has the advantages of homologous airflow, no additional cost, low device processing difficulty and cost saving, and the airflow self-coupling can greatly reduce the diameter of the melt-blown fibers and meet the large-scale preparation work of the nano melt-blown fibers.
Description
Technical Field
The invention relates to the technical field of melt-blowing equipment, in particular to an air flow self-coupling melt-blowing die head for a nanofiber preparation device.
Background
Melt-blowing is a commonly used technology for preparing micro-nano fibers on a large scale. Compared with other methods for preparing micro-nano fibers, the method has the advantages that the melt-blown nonwoven fabric is widely concerned with the advantages of high yield, no need of solvents and the like; the important development trend of melt-blown non-woven technology is to prepare thinner fibers on the premise of not increasing excessive cost, the diameter of the melt-blown fibers is mostly between 1 mu m and 5 mu m at present, and the melt-blown fibers are widely applied to the fields of medical treatment, chemical industry, energy, machinery, electronics, automobiles, environmental protection and the like because of thin fibers, multiple pores and small pore diameter and have a tree-root-shaped channel system, the filtering efficiency reaches over 99.9 percent, if the fibers can be stably thinned to the nanometer level, the filtering performance and the adsorption performance of the product can be greatly improved, and the application prospect in the fields and even other fields can be wider.
Further refinement of the fibers is achieved primarily by improvements in the raw materials, processes and equipment. In the raw material aspect, this is mainly achieved by increasing the melt flow rate (melt index) of the polymer. However, the raw materials with higher melt index are more expensive, the requirements on a melt flow channel are different from the prior art, the preparation can be carried out by further improving the process, and the production cost is greatly increased. In the aspect of the process, the method is mainly realized by increasing the initial speed of the airflow and reducing the melt extrusion rate, but the energy consumption is further increased when the initial speed of the airflow is too high, and the yield of the non-woven fabric is greatly influenced when the flow rate of the polymer is too low.
In order to further thin the fiber, most of the devices are started, wherein the most direct way is to make the aperture of the spinneret orifice small, in order to stably prepare the nanometer-scale melt-blown fiber, the german Rieter company and the U.S. Hills company make the aperture of the spinneret orifice 0.1mm-0.12mm, which is far smaller than the size of the current commercially available melt-blown spinneret orifice, and all of them stably obtain the nanometer melt-blown fiber with the size below 500nm, but the difficulty of making the spinneret orifice thin is very large, the cost is very high, when the aperture of the spinneret orifice is small, the average extrusion amount of the melt per orifice is reduced, the shearing pressure when the melt passes through the orifice is increased, so that the raw material with higher melt flow rate is required, and the cost is further increased. In addition to this, it can also be deployed around a meltblowing nozzle, which generally comprises orifices for extruding the melt, gas flow channels outside the orifices for ejecting gas: wherein the airflow ejected from the airflow channel is used for drafting the melt to prepare the melt-blown fiber.
Chinese patent application publication No. CN208791821U discloses a melt-blowing nozzle structure with an additional air flow channel, which provides a second air flow channel, so that the melt extruded from the annular spinneret orifice drawn by the first air flow channel is further drawn by the second air flow, thereby reducing the diameter of the melt-blown fiber. However, the pressure difference between the first airflow and the second airflow is large, and different air pumps are needed to provide airflow sources, which not only increases the cost, but also complicates the processing technology (airflow channel interfaces which do not affect each other need to be arranged in the mold); the method for drafting the fibers by two air flows is also different from the method, and the situation that the fibers are broken and fly is possibly serious due to the fact that the two air flows with larger pressure difference clamp the fibers for drafting; in addition, although the nano-scale melt-blown fiber is finally prepared, the used airflow pressure and the melt processing temperature are far higher than those of the method, and the cost is higher; how to reduce the diameter of the melt-blown fiber on the basis of saving the cost to stably prepare large-scale nanometer-scale melt-blown fiber is a problem to be solved by the technical personnel in the field, and in order to solve the problem, the invention provides an air flow self-coupling melt-blown die head for a nanofiber preparation device.
Disclosure of Invention
The invention aims to provide the melt-blown die head for preparing the nano fibers with the airflow self-coupling function, the airflow is homologous, the additional cost is not added, the device processing difficulty is low, the cost is saved, the diameter of the melt-blown fibers can be greatly reduced through the airflow self-coupling, and the large-scale preparation work of the nano melt-blown fibers can be met.
In order to achieve the purpose, the invention adopts the following technical scheme:
an airflow self-coupling melt-blowing die head for a nanofiber preparation device comprises a nozzle middle block and a receiving screw extrusion melt assembly, wherein first threaded holes are formed in four corners of the nozzle middle block and the receiving screw extrusion melt assembly, and the receiving screw extrusion melt assembly is fixedly connected to the back of the nozzle middle block through the first threaded holes and connecting bolts; one side of the nozzle middle block is fixedly connected with an air compressed air inlet; a nozzle edge block is arranged on one side of the nozzle middle block, which is opposite to the side for receiving the screw rod extrusion melt assembly, second threaded holes are formed in the edge positions of the nozzle edge block and the nozzle middle block, and the nozzle edge block is fixedly connected with the nozzle middle block through the second threaded holes and connecting bolts; a spinneret orifice is arranged in the nozzle middle block, a first air flow channel is arranged between the nozzle middle block and the nozzle side block, a gasket is connected in the first air flow channel, and a second air flow channel is arranged in the nozzle side block; the bottom of the nozzle side block is also fixedly provided with a first external nozzle assembly or a second external spraying assembly; the first air flow and the second air flow sprayed out of the first air flow channel and the second air flow channel are both used for stretching melt fibers, the second air flow and the first air flow can generate a high-temperature heat preservation area for a coating area between the first air flow and the second air flow while being self-coupled, the solidification speed of the melt fibers after being sprayed out of the spinneret orifice can be greatly reduced, the self-coupling of the second air flow and the first air flow can sufficiently draft the melt fibers, and the fineness attenuation of the melt fibers is more severe.
Preferably, the number of the nozzle side blocks is 2, and the nozzle side blocks are symmetrically arranged on two sides of the nozzle middle block.
Preferably, the diameter of the spinneret orifice ranges from 0.35mm plus or minus 0.2 mm.
Preferably, the first air flow channel and the second air flow channel are inclined channels inclined towards the spinneret orifice along the air flow direction.
Preferably, the included angle of the air flow of the first air flow channel ranges from 60 ° ± 15 °, and the included angle of the air flow of the second air flow channel ranges from 45 ° ± 30 °.
Preferably, the range of the width of the first air flow channel is 0.45mm +/-0.2 mm, and the range of the width of the second air flow channel is 0.35mm +/-0.15 mm.
Preferably, the range of the vertical distance between the nozzle middle block and the nozzle side block is 2mm +/-1 mm, the range of the horizontal distance between the spinneret orifice and the first air flow channel is 1mm +/-0.1 mm, and the range of the horizontal distance between the first air flow channel and the second air flow channel is 3mm +/-3 mm.
Preferably, the outlet width of the first external nozzle assembly and the outlet width of the second external nozzle assembly are within a range of 3.7mm +/-0.5 mm, the height of the first external nozzle assembly is within a range of 30mm +/-15 mm, the outlet angle of the first external nozzle assembly is within a range of 65 +/-5 degrees, the outlet angle of the second external nozzle assembly is within a range of 35 +/-15 degrees, the width of an upper opening of the second external nozzle assembly is within a range of 5mm +/-5 mm, and the width of a lower opening of the second external nozzle assembly is within a range of 12mm +/-5 mm.
Compared with the prior art, the invention provides an air flow self-coupling melt-blowing die head for a nanofiber preparation device, which has the following beneficial effects:
in the nano-fiber preparation device provided by the invention, in the melt-blowing process of the air flow self-coupling melt-blowing die head, after the air flow channels symmetrical at two sides of the hot air flow are sprayed out, the melt extruded from the spinneret orifices is stretched by the inner symmetrical air flow, and the temperature of the area is kept by the outer symmetrical air flow, so that the temperature of the area is increased and attenuated slowly, and the quantitative comparison (stagnation temperature T) can be carried out through the change of the stagnation temperature in the area※Is a parameter used for describing the stagnation state of a certain point of the airflow field, T※＝T+Va 2/2CpaT is the resting temperature, Va 2/2CpaIs a dynamic temperature, VaIs the velocity of the gas flow, CpaIs the specific heat capacity of the airflow jet) the stagnation temperature of the area keeps a distance far larger than that of the original mold in the area of the central line of the airflow, and the melt is further stretched when the external symmetrical airflow meets the internal symmetrical airflow, so that the diameter of the melt-blown fiber can be effectively reduced on the premise of not increasing the energy consumption, so that thinner fiber can be obtained on the basis of not changing the diameter of a spinneret orifice, and the cost is effectively saved; in addition, the number and the shape of the second airflow channels in the nozzle side block are not fixed and can be adjusted according to needs, for example, two airflow channels with different angles can be arranged in the nozzle side block, so that the melt fiber is subjected to the additional drafting action of three times of symmetrical airflow in the moving process, the high-temperature heat preservation of the environment is ensured in a longer area, and the nano melt-blown fiber with smaller average size is prepared; it is also possible to shape the second air flow channel in the nozzle edge block, for example by making the angles of its two borders different, so that an air flow channel can be formed which gradually decreases or increases in the direction of the air flow, during which the air flow is continuously suppliedDifferent air flow speeds are given to the second air flow channel, so that the preparation of fibers with thinner sizes is facilitated; in addition, the bottom of the nozzle side block is also connected with an external spraying assembly, self-coupling air flow can be well further drawn, the speed of an air flow central line is increased, the fiber attenuation rate is further accelerated within a limited distance, turbulent dissipation of surrounding air flow during self coupling of multiple air flows can be reduced, feedback coupling air flow can bounce back on the wall surface of an external nozzle after the air flow is sprayed from a second air flow channel and collides with main air flow, and the external nozzle can achieve different traction effects by designing the inner wall of the external nozzle differently, so that the preparation of nano fibers is facilitated.
In summary, the beneficial effects of the present invention can be summarized as follows:
(1) the invention can effectively reduce the energy consumption required by preparing finer melt-blown fiber and can provide energy utilization rate;
(2) the invention can be suitable for preparing different polymer fibers, and has wider application range;
(3) the structure with the airflow self-coupling function provided by the invention is more convenient to process, lower in cost and obvious in effect;
(4) the invention can prepare a large amount of nanometer melt-blown fiber at lower cost, and the performances of filtration, adsorption and the like can be greatly improved after the fiber reaches the nanometer level, so that the melt-blown nanometer fiber can be applied to other fields in a wider range.
Drawings
FIG. 1 is a schematic structural view of a conventional meltblowing die apparatus;
FIG. 2 is a schematic diagram of a slot gas flow channel structure of a prior art melt-blowing die head device;
FIG. 3 is a schematic view of an airflow channel structure of an airflow self-coupling melt-blowing die head for a nanofiber manufacturing apparatus according to the present invention;
FIG. 4 is an exploded view of a structure of a self-coupling air flow meltblown die head for a nanofiber manufacturing apparatus according to the present invention;
FIG. 5 is a sectional view of a nozzle edge block of an air flow self-coupling melt-blowing die head for a nanofiber manufacturing apparatus according to the present invention;
FIG. 6 is a schematic view of an airflow channel structure of a second type of embodiment of an airflow self-coupling melt-blowing die head for a nanofiber manufacturing apparatus according to the present invention;
FIG. 7 is a schematic view of an airflow channel structure of a third type of embodiment of an airflow self-coupling melt-blowing die head for a nanofiber manufacturing apparatus according to the present invention;
FIG. 8 is a schematic view of an airflow channel structure of a nanofiber manufacturing apparatus according to the present invention, when the nanofiber manufacturing apparatus is connected to a first external nozzle assembly by using a fourth type of embodiment of an airflow self-coupling meltblown die head;
fig. 9 is a schematic view of an air flow channel structure of a nanofiber manufacturing apparatus according to the present invention when the nanofiber manufacturing apparatus is connected to a second external nozzle assembly by using a fourth type of embodiment of an air flow self-coupling meltblown die head.
The reference numbers in the figures illustrate:
1. a spinneret orifice; 2. a nozzle intermediate block; 3. a first air flow passage; 4. a nozzle edge block; 5. a second airflow channel; 6. a third airflow channel; 7. an air compression airflow inlet; 8. receiving a screw to extrude a melt component; 9. a gasket; 10. a second threaded hole; 11. a second threaded hole; 12. a first circumscribed nozzle assembly; 13. a second external nozzle assembly; a. the width of the spinneret orifice; b. a first air flow channel width; c. the first air flow channel is horizontally spaced from the second air flow channel; d. a second airflow channel width; e. the nozzle middle block is vertically spaced from the nozzle side blocks; f. the second airflow channel and the third airflow channel are horizontally spaced; g. a third airflow channel width; h. a width of an outlet of the circumscribed nozzle assembly; i. the width of a nozzle opening of the external nozzle assembly; j. a nozzle height of the circumscribed nozzle assembly; k. the width of the external nozzle component contacting the nozzle edge block; m, width of a gap on the second external nozzle assembly; n, the width of a lower gap of the second external nozzle component; theta, the included angle of the first air flow channel; beta, the included angle of the second airflow channel; gamma, the right wall included angle of the second airflow channel; eta, the included angle of the third air flow channel; omega, the included angle of the nozzle of the first external nozzle component; psi and the included angle of the nozzle of the second external nozzle assembly.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1-4, the embodiment provides an airflow self-coupling melt-blowing die head for a nanofiber preparation device based on the conventional design shown in fig. 1-2, which includes a nozzle middle block 2 and a receiving screw melt-extruding assembly 8, wherein first threaded holes 11 are formed at four corners of the nozzle middle block 2 and the receiving screw melt-extruding assembly, and the receiving screw melt-extruding assembly 8 is fixedly connected to the back of the nozzle middle block 2 through the first threaded holes 11 and connecting bolts; one side of the nozzle middle block 2 is fixedly connected with an air compressed airflow inlet 7; a nozzle edge block 4 is arranged on one side of the nozzle middle block 2, which is opposite to the screw extrusion melt assembly 8, a second threaded hole 10 is arranged at the edge positions of the nozzle edge block 4 and the nozzle middle block 2, and the nozzle edge block 4 is fixedly connected with the nozzle middle block 2 through the second threaded hole 10 and a connecting bolt; a spinneret orifice 1 is arranged in a nozzle middle block 2, a first airflow channel 3 is arranged between the nozzle middle block 2 and a nozzle side block 4, a gasket 9 is connected in the first airflow channel 3, a second airflow channel 5 is arranged in the nozzle side block 4, after airflow channels symmetrical to two sides of hot airflow are ejected in the melt-blowing processing process, a melt extruded from the spinneret orifice 1 is stretched by internal symmetrical airflow, the external symmetrical airflow is used for preserving heat of the area, so that the temperature of the area is raised and the attenuation is slowed down, the melt is further stretched when the external symmetrical airflow meets the internal symmetrical airflow, and further, the diameter of melt-blown fibers can be effectively reduced on the premise of not increasing energy consumption, so that thinner fibers can be obtained on the basis of not changing the diameter of the spinneret orifice 1, and the cost is effectively saved; in addition, the number and the shape of the second airflow channels 5 in the nozzle edge block 4 are not fixed and can be adjusted according to requirements, for example, two airflow channels with different angles can be arranged in the nozzle edge block 4, so that the melt fiber is subjected to the additional drafting action of three times of symmetrical airflow in the movement process, the high-temperature heat preservation of the environment is ensured in a longer area, and the nano melt-blown fiber with smaller average size is prepared; the second air flow path 5 in the nozzle edge block 4 may also be shaped, for example, so that the angles of its two boundaries are different, respectively, thereby forming an air flow path which gradually decreases or expands in the air flow direction, and giving the second air flow path 5 different air flow velocities when the air flow is continuously supplied, thereby further facilitating the production of finer-sized fibers.
The number of the nozzle side blocks 4 is 2, and the nozzle side blocks 4 are symmetrically disposed at both sides of the nozzle middle block 2, so that the air flow passages between the nozzle middle block 2 and the nozzle side blocks 4 and the air flow passages inside the nozzle side blocks 4 are also symmetrically disposed at both sides.
The diameter of the spinneret orifice 1 is in a range of 0.35mm +/-0.2 mm, and the melt extruded from the spinneret orifice 1 can be a polymer melt or other types of melts, which is not specifically limited herein.
The first air flow channel 3 and the second air flow channel 5 are both inclined channels inclined towards the spinneret orifice 1 along the air flow direction, so that the air flows flowing out from the first air flow channel 3 and the second air flow channel 5 are sprayed onto the melt at a certain inclination angle, the stretching effect is effectively improved, wherein the second air flow channel 5 can also be a parallel channel parallel to the spinneret orifice 1 along the air flow direction, and the details are not described here and are all within the protection range.
The included angle of the air flow of the first air flow channel 3 ranges from 60 degrees +/-15 degrees, and the included angle of the air flow of the second air flow channel 5 ranges from 45 degrees +/-30 degrees.
The width of the first airflow channel 3 is 0.45mm +/-0.2 mm, and the width of the second airflow channel 5 is 0.35mm +/-0.15 mm.
The vertical distance between the nozzle middle block 2 and the nozzle side block 4 ranges from 2mm +/-1 mm, the horizontal distance between the spinneret orifice 1 and the first air flow channel 3 ranges from 1mm +/-0.1 mm, and the horizontal distance between the first air flow channel 3 and the second air flow channel 5 ranges from 3mm +/-3 mm.
In summary, the embodiments of the present invention can be divided into three types, specifically:
first type of embodiment
Referring to fig. 3-5, the number of the nozzle edge blocks 4 is two and symmetrically disposed on two sides of the nozzle middle block 2, and thus it can be seen that the number of the first air flow channels 3 and the number of the second air flow channels 5 are also two and symmetrically disposed on two sides of the nozzle middle block 2;
the first air flow channels 3 and the second air flow channels 5 are inclined channels, and the two first air flow channels 3 and the two second air flow channels 5 are close to the spinneret orifice 1 along the air flow direction, but are not parallel to each other, so that a narrow groove shape is formed, and the stretching effect is further improved;
the second airflow channel 5 is arranged in each of the two nozzle side blocks 4, so that the high-temperature stability of the whole area before the airflow intersection is ensured, the main airflow is further drafted at the intersection, the stretching and refining degree of the melt is further ensured, and the product quality is effectively improved;
the direction of the second air flow channel 5 is close to the spinneret orifice 1, but the angle of the second air flow channel 5 is changed, so that heat preservation areas with different sizes are formed, and the air flow is different along with the change of the angle of the second air flow channel 5;
as shown in fig. 3, for convenience of installation, the included angle β of the second air flow channel 5 is 45 ° ± 30 ° and is close to the spinneret orifice 1; wherein, the transverse distance d between the second air flow channel 5 and the first air flow channel 3 ranges from 3mm to 6 mm;
further, the value range of the air flow included angle θ of the first air flow channel 3 is 60 ° ± 15 °; the value range of the diameter a of the spinneret orifice 1 is 0.35mm plus or minus 0.1 mm; the channel width b of the first air flow channel 3 is in the range of 0.45mm +/-0.2 mm; the range of the horizontal distance c between the first air flow channel 3 and the second air flow channel 5 is 3mm +/-3 mm; the outlet width d of the second air flow channel 5 is in the range of 0.35mm plus or minus 0.15 mm; the value range of the vertical distance e from the nozzle position of the spinneret orifice 1 to the air flow opening in the middle of the two nozzle side blocks 4 is 2mm +/-1 mm; the included angle of the air flow is the included angle of the air flow sprayed out from the air flow channel parts oppositely arranged at the two sides of the nozzle middle block 2.
The exploded view of the melt-blowing die head used in this embodiment is shown in fig. 4, in which a gasket 9 is additionally added, the gasket 9 is used to adjust the width of the first air flow channel 3, the melt polymer is transferred to the assembly 8 through the screw, then transferred to the nozzle center block 2, and finally extruded from the spinneret orifice 1, and the air flow enters through the air compression air flow inlet 7, when the exploded view is fixed, the air flow is simultaneously ejected through the first air flow channel 3 and the second air flow channel 5; the cross-sectional view of the nozzle edge block is shown in fig. 5, which clearly shows the shape and structure of the second air flow channel 5, and facilitates understanding of the state of the air flow flowing in from the first air flow channel 3 and the second air flow channel 5.
Second type of embodiment
The second air flow channel 5 is designed in a gradual change way, as shown in fig. 6, the included angle theta of the first air flow channel 3 and the wall surface angle beta of the second air flow channel 5 close to the spinneret orifice 1 are fixed, the wall surface angle gamma at the other end of the second air flow channel 5 is adjusted, at this time, because the angles of beta and gamma are different, the second air flow channel 5 forms a channel with the width gradually reduced or gradually enlarged, the speed of the air flow in the second air flow channel 5 can be changed to a certain degree by the design according to the formula of flow and sectional area, and the supply of the air flow is more stable when the volume of an air cavity is increased, which is beneficial to the stability of the secondary drafting fiber air flow, and the uniformity of the thickness of the prepared fiber is improved.
Third type of embodiment
In the first type of embodiment, the third air flow channel 6 is additionally arranged inside the nozzle edge block 4, as shown in fig. 7, the air flow angle η of the third air flow channel 6 is smaller than the angle β of the second air flow channel 5, the air flow passing through the third air flow channel 6 further drafts the secondary drafted air flow, and the thermal insulation area of the hot air flow is expanded, so that the fiber size is further attenuated to a certain extent.
Fourth type of embodiment
Adding a newly designed external nozzle device (comprising a first external nozzle assembly 12 or a second external nozzle assembly 13) on the basis of the first type of embodiment, as shown in fig. 8, the first external nozzle assembly 12 is symmetrically arranged on the nozzle side block 4 beside the second air flow channel 5 and tightly attached to the nozzle side block 4, after the air flow is ejected from the second air flow channel 5 and collides with the main air flow, part of the air flow can form turbulence to dissipate energy, and the external nozzle functions to further absorb the coupled air flow and reduce dissipation, so that more energy is concentrated on the speed attenuation and the temperature attenuation, and the formation of nano fibers is facilitated; by modifying the external nozzle device, as shown in fig. 9, the air chamber of the air outlet forms a faster attenuation, which further increases the speed of the centerline air flow and is beneficial to the attenuation of the overall size of the fiber
Based on the classification of the types of the embodiments, the following embodiments are specifically included;
example 1:
is a first type of embodiment; the melt is extruded from the spinneret hole 1, the gas with high speed and high temperature is sprayed from the first gas flow channel 3, and the melt extruded from the spinneret hole 1 is stretched.
In this embodiment, the included angle of the air flow in the first air flow channel 3 is 60 °, the diameter a of the spinneret orifice is 0.35mm, the channel width b of the first air flow channel 3 is 0.35mm, and the vertical distance e between the nozzle middle block 2 and the nozzle side block 4 is 2 mm.
The included angle of the second airflow channel 5 is 45 °, the transverse distance c between the first airflow channel 3 and the second airflow channel 5 is 3mm, and the outlet width d of the second airflow channel 5 is 0.35 mm.
In this example, the melt was polypropylene, the screw extrusion rate was 100r/min, the initial temperature was 255 ℃, the gas pressure was 250kPa, and the gas initial temperature was 255 ℃.
The average diameter of the fibers produced by the meltblown nozzle structure with the plurality of two symmetrical air streams in the side block under the above conditions was 689.5nm, while the average diameter of the fibers produced by the meltblown nozzle structure with the plurality of two symmetrical air streams in the side block under the same conditions was 1.732 um. Therefore, the diameter of the fiber is reduced by 60.1 percent after two symmetrical air flows are arranged in the nozzle edge block 4.
Example 2:
is a first type of embodiment; the melt is extruded from the spinneret hole 1, the gas with high speed and high temperature is sprayed from the first gas flow channel 3, and the melt extruded from the spinneret hole 1 is stretched.
In this embodiment, the included angle of the air flow in the first air flow channel 3 is 60 °, the diameter a of the spinneret orifice is 0.35mm, the channel width b of the first air flow channel 3 is 0.35mm, and the vertical distance e between the nozzle middle block 2 and the nozzle side block 4 is 2 mm.
The included angle of the second airflow channel 5 is 45 °, the transverse distance c between the first airflow channel 3 and the second airflow channel 5 is 3mm, and the outlet width d of the second airflow channel 5 is 0.35 mm.
In this example, the melt was polypropylene, the screw extrusion rate was 100r/min, the initial temperature was 265 ℃, the gas pressure was 250kPa, and the gas initial temperature was 265 ℃.
The average diameter of the fibers produced by the meltblown nozzle configuration with the plurality of symmetrical jets in the side block set under the above conditions was 612.7nm, while the average diameter of the fibers produced by the meltblown nozzle configuration without the plurality of symmetrical jets in the side block set under the same conditions was 1.668 um. It can be seen that the fiber diameter ratio of the nozzle edge block 4 with two symmetrical air streams therein was reduced by 63.2%.
Example 3:
is a first type of embodiment; the melt is extruded from the spinneret hole 1, the gas with high speed and high temperature is sprayed from the first gas flow channel 3, and the melt extruded from the spinneret hole 1 is stretched.
In this embodiment, the included angle of the air flow in the first air flow channel 3 is 60 °, the diameter a of the spinneret orifice is 0.35mm, the channel width b of the first air flow channel 3 is 0.35mm, and the vertical distance e between the nozzle middle block 2 and the nozzle side block 4 is 2 mm.
The included angle of the second airflow channel 5 is 45 °, the transverse distance c between the first airflow channel 3 and the second airflow channel 5 is 3mm, and the outlet width d of the second airflow channel 5 is 0.35 mm.
In this example, the melt was polypropylene, the screw extrusion rate was 100r/min, the initial temperature was 275 deg.C, the gas pressure was 250kPa, and the gas initial temperature was 275 deg.C.
The average diameter of the fibers produced by the meltblown nozzle structure with the plurality of symmetrical air streams in the side block set under the above conditions was 447.2nm, while the average diameter of the fibers produced by the meltblown nozzle structure without the plurality of symmetrical air streams in the side block set under the same conditions was 1.459 um. It can be seen that the diameter of the fibers is reduced by 69% after two symmetrical air flows are provided in the nozzle edge block 4.
Example 4:
is a first type of embodiment; the melt is extruded from the spinneret hole 1, the gas with high speed and high temperature is sprayed from the first gas flow channel 3, and the melt extruded from the spinneret hole 1 is stretched.
In this embodiment, the included angle of the air flow in the first air flow channel 3 is 60 °, the diameter a of the spinneret orifice is 0.35mm, the channel width b of the first air flow channel 3 is 0.35mm, and the vertical distance e between the nozzle middle block 2 and the nozzle side block 4 is 2 mm.
The included angle of the second airflow channel 5 is 45 °, the transverse distance c between the first airflow channel 3 and the second airflow channel 5 is 3mm, and the outlet width d of the second airflow channel 5 is 0.35 mm.
In this example, the melt was polypropylene, the screw extrusion rate was 100r/min, the initial temperature was 255 ℃, the gas pressure was 200kPa, and the gas initial temperature was 255 ℃.
The average diameter of the fibers obtained from the meltblown nozzle structure with the two symmetrical air streams inside the side block set under the above conditions was 1.4598um, while the average diameter of the fibers obtained from the meltblown nozzle structure without the two symmetrical air streams inside the side block set under the same conditions was 2.2768 um. It can be seen that the arrangement of two symmetrical air streams in the nozzle edge block 4 reduces the fiber diameter ratio by 35.88% from the original.
Example 5:
is a first type of embodiment; for the first type of embodiment:
the melt is extruded from the spinneret hole 1, the gas with high speed and high temperature is sprayed from the first gas flow channel 3, and the melt extruded from the spinneret hole 1 is stretched.
In this embodiment, the included angle of the air flow in the first air flow channel 3 is 60 °, the diameter a of the spinneret orifice is 0.35mm, the channel width b of the first air flow channel 3 is 0.35mm, and the vertical distance e between the nozzle middle block 2 and the nozzle side block 4 is 2 mm.
The included angle of the second airflow channel 5 is 45 °, the transverse distance c between the first airflow channel 3 and the second airflow channel 5 is 3mm, and the outlet width d of the second airflow channel 5 is 0.35 mm.
In this example, the melt was polypropylene, the screw extrusion rate was 100r/min, the initial temperature was 265 ℃, the gas pressure was 200kPa, and the gas initial temperature was 265 ℃.
The average diameter of the fibers produced by the meltblown nozzle configuration with the plurality of symmetrical jets in the side block set under the above conditions was 1.480um, while the average diameter of the fibers produced by the meltblown nozzle configuration without the plurality of symmetrical jets in the side block set under the same conditions was 2.0634 um. Therefore, the diameter of the fiber is reduced by 28.2 percent after two symmetrical air flows are arranged in the nozzle edge block 4.
Example 6:
is a first type of embodiment; the melt is extruded from the spinneret hole 1, the gas with high speed and high temperature is sprayed from the first gas flow channel 3, and the melt extruded from the spinneret hole 1 is stretched.
In this embodiment, the included angle of the air flow in the first air flow channel 3 is 60 °, the diameter a of the spinneret orifice is 0.35mm, the channel width b of the first air flow channel 3 is 0.35mm, and the vertical distance e between the nozzle middle block 2 and the nozzle side block 4 is 2 mm.
The included angle of the second airflow channel 5 is 45 °, the transverse distance c between the first airflow channel 3 and the second airflow channel 5 is 3mm, and the outlet width d of the second airflow channel 5 is 0.35 mm.
In this example, the melt was polypropylene, the screw extrusion rate was 100r/min, the initial temperature was 275 deg.C, the gas pressure was 200kPa, and the gas initial temperature was 275 deg.C.
The average diameter of the fibers obtained from the meltblown nozzle structure with the plurality of symmetrical jets arranged in the side block under the above conditions was 848.36nm, while the average diameter of the fibers obtained from the meltblown nozzle structure without the plurality of symmetrical jets arranged in the side block under the same conditions was 1.4515 μm. It can be seen that the fiber diameter ratio of the nozzle edge block 4 with two symmetrical air streams therein was reduced by 41.5%.
Example 7:
is a first type of embodiment; the melt is extruded from the spinneret hole 1, the gas with high speed and high temperature is sprayed from the first gas flow channel 3, and the melt extruded from the spinneret hole 1 is stretched.
In this embodiment, the included angle of the air flow in the first air flow channel 3 is 60 °, the diameter a of the spinneret orifice is 0.35mm, the channel width b of the first air flow channel 3 is 0.35mm, and the vertical distance e between the nozzle middle block 2 and the nozzle side block 4 is 2 mm.
The air flow included angle of the second air flow channel 5 is 45 degrees, the transverse distance c between the first air flow channel 3 and the second air flow channel 5 is 3mm, and the outlet width d of the second air flow channel 5 is 0.35 mm.
In this example, the melt was polypropylene, the screw extrusion rate was 100r/min, the initial temperature was 275 deg.C, the gas pressure was 400kPa, and the gas initial temperature was 280 deg.C.
The average diameter of the fibers obtained from the meltblown nozzle structure with the plurality of symmetrical jets arranged in the side block under the above conditions was 178.27nm, while the average diameter of the fibers obtained from the meltblown nozzle structure without the plurality of symmetrical jets arranged in the side block under the same conditions was 1.0247 μm. It can be seen that the diameter of the fibers within the nozzle edge block 4 is reduced by 82.6% after two symmetrical air streams are provided.
Example 8:
a second type of embodiment; the melt is extruded from the spinneret hole 1, the gas with high speed and high temperature is sprayed from the first gas flow channel 3, and the melt extruded from the spinneret hole 1 is stretched.
In this embodiment, the included angle of the air flow in the first air flow channel 3 is 60 °, the diameter a of the spinneret orifice is 0.35mm, the channel width b of the first air flow channel 3 is 0.35mm, and the vertical distance e between the nozzle middle block 2 and the nozzle side block 4 is 2 mm.
Wherein, the left wall airflow included angle β of the second airflow channel 5 is 45 °, the right wall airflow included angle γ is 30 °, the transverse distance c between the first airflow channel 3 and the second airflow channel 5 is 3mm, and the outlet width d of the second airflow channel 5 is 0.35 mm.
In this example, the melt was polypropylene, the screw extrusion rate was 100r/min, the initial temperature was 275 deg.C, the gas pressure was 250kPa, and the gas initial temperature was 275 deg.C.
The average diameter of the fibers produced by the meltblown nozzle structure with the plurality of symmetrical air streams in the side block set under the above conditions was 0.496um, while the average diameter of the fibers produced by the meltblown nozzle structure with the plurality of symmetrical air streams in the side block not set under the same conditions was 1.274 um. It can be seen that the fiber diameter ratio of the nozzle edge block 4 with two symmetrical air streams therein was reduced by 61.1%.
Example 9:
is a third type of embodiment; the melt is extruded from the spinneret hole 1, the gas with high speed and high temperature is sprayed from the first gas flow channel 3, and the melt extruded from the spinneret hole 1 is stretched.
In this embodiment, the included angle of the air flow in the first air flow channel 3 is 60 °, the diameter a of the spinneret orifice is 0.35mm, the channel width b of the first air flow channel 3 is 0.35mm, and the vertical distance e between the nozzle middle block 2 and the nozzle side block 4 is 2 mm.
The included angle of the second airflow channel 5 is 45 °, the included angle of the third airflow channel 6 is 30 °, the lateral distance c between the first airflow channel 3 and the second airflow channel 5 is 3mm, the lateral distance f between the second airflow channel 5 and the third airflow channel 6 is 5mm, the outlet width d of the second airflow channel 5 is 0.35mm, and the outlet width g of the third airflow channel 6 is 0.35 mm.
In this example, the melt was polypropylene, the screw extrusion rate was 100r/min, the initial temperature was 275 deg.C, the gas pressure was 250kPa, and the gas initial temperature was 275 deg.C.
The average diameter of the fibers produced by the meltblown nozzle configuration with the plurality of symmetrical jets in the side block set under the above conditions was 0.322um, while the average diameter of the fibers produced by the meltblown nozzle configuration without the plurality of symmetrical jets in the side block set under the same conditions was 1.238 um. It can be seen that the arrangement of two symmetrical air streams in the nozzle edge block 4 reduces the fiber diameter ratio by 74.00% from the original.
Example 10:
is a fourth type of embodiment; the melt is extruded from the spinneret hole 1, the gas with high speed and high temperature is sprayed from the first gas flow channel 3, and the melt extruded from the spinneret hole 1 is stretched.
In this embodiment, the included angle of the air flow in the first air flow channel 3 is 60 °, the diameter a of the spinneret orifice 1 is 0.35mm, the channel width b of the first air flow channel 3 is 0.35mm, and the vertical distance e between the nozzle middle block 2 and the nozzle side block 4 is 2 mm.
The included angle of the second airflow channel 5 is 45 °, the transverse distance c between the first airflow channel 3 and the second airflow channel 5 is 3mm, and the outlet width d of the second airflow channel 5 is 0.35 mm.
Wherein, the outlet width h of the second external nozzle component 13 is 4.3mm, the height j is 25mm, the outlet included angle psi is 35 degrees, the width m of the upper gap of the second external nozzle component is 5mm, and the width n of the lower gap is 12 mm.
In this example, the melt was polypropylene, the screw extrusion rate was 100r/min, the initial temperature was 275 deg.C, the gas pressure was 250kPa, and the gas initial temperature was 275 deg.C.
The average diameter of the fibers obtained from the meltblown nozzle structure with the plurality of symmetrical jets arranged in the side block under the above conditions was 288.2nm, while the average diameter of the fibers obtained from the meltblown nozzle structure without the plurality of symmetrical jets arranged in the side block under the same conditions was 1.319 um. Therefore, the diameter of the fiber is reduced by 78.15 percent after two symmetrical air flows are arranged in the nozzle edge block 4.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The utility model provides a nanofiber is air current self-coupling for preparation device melts die head, includes nozzle intermediate block (2) and accepts screw extrusion fuse-element subassembly (8), its characterized in that: the four corners of the nozzle middle block (2) and the receiving screw rod extruded melt component are respectively provided with a first threaded hole (11), and the receiving screw rod extruded melt component (8) is fixedly connected to the back of the nozzle middle block (2) through the first threaded holes (11) and connecting bolts; one side of the nozzle middle block (2) is fixedly connected with an air compression airflow inlet (7); a nozzle edge block (4) is arranged on one side, opposite to the screw extrusion melt assembly (8), of the nozzle middle block (2), second threaded holes (10) are formed in the edge positions of the nozzle edge block (4) and the nozzle middle block (2), and the nozzle edge block (4) is fixedly connected with the nozzle middle block (2) through the second threaded holes (10) and connecting bolts; a spinneret orifice (1) is arranged in the nozzle middle block (2), a first air flow channel (3) is arranged between the nozzle middle block (2) and the nozzle side block (4), a gasket (9) is connected in the first air flow channel (3), and a second air flow channel (5) is arranged in the nozzle side block (4); the bottom of the nozzle side block (4) is also fixedly provided with a first external nozzle assembly (12) or a second external spraying assembly (13).
2. The airflow self-coupling melt-blowing die head for the nanofiber preparing device as claimed in claim 1, wherein: the number of the nozzle side blocks (4) is 2, and the nozzle side blocks (4) are symmetrically arranged on two sides of the nozzle middle block (2).
3. The air flow self-coupling melt-blowing die head for the nanofiber preparing device as claimed in claim 1, wherein: the diameter of the spinneret orifice (1) is in the range of 0.35mm +/-0.2 mm.
4. The air flow self-coupling melt-blowing die head for the nanofiber preparing device as claimed in claim 1, wherein: the first air flow channel (3) and the second air flow channel (5) are inclined channels which are inclined towards the spinneret orifice (1) along the air flow direction.
5. The air flow self-coupling melt-blowing die head for the nanofiber preparing device as claimed in claim 1, wherein: the included angle of the air flow of the first air flow channel (3) ranges from 60 degrees +/-15 degrees, and the included angle of the air flow of the second air flow channel (5) ranges from 45 degrees +/-30 degrees.
6. The air flow self-coupling melt-blowing die head for the nanofiber preparing device as claimed in claim 1, wherein: the width of the first air flow channel (3) is within a range of 0.45mm +/-0.2 mm, and the width of the second air flow channel (5) is within a range of 0.35mm +/-0.15 mm.
7. The air flow self-coupling melt-blowing die head for the nanofiber preparing device as claimed in claim 1, wherein: the range of the vertical distance between the nozzle middle block (2) and the nozzle side block (4) is 2mm +/-1 mm, the range of the horizontal distance between the spinneret orifice (1) and the first air flow channel (3) is 1mm +/-0.1 mm, and the range of the horizontal distance between the first air flow channel (3) and the second air flow channel (5) is 3mm +/-3 mm.
8. The air flow self-coupling melt-blowing die head for the nanofiber preparing device as claimed in claim 1, wherein: the outlet width value range of the first external nozzle assembly (12) and the second external nozzle assembly (13) is 3.7mm +/-0.5 mm, and the height value range is 30mm +/-15 mm; the outlet angle range of the first circumscribed nozzle assembly (12) is 65 ° ± 5 °, and the outlet angle range of the second circumscribed nozzle assembly (13) is 35 ° ± 15 °; the width range of an upper opening of the second outer nozzle assembly (13) is 5mm +/-5 mm, and the width range of a lower opening of the second outer nozzle assembly (13) is 12mm +/-5 mm.
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| CN202210132128.8A CN114457432B (en) | 2022-02-14 | 2022-02-14 | Airflow self-coupling melt-blowing die head for nanofiber preparation device |
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| CN202210132128.8A CN114457432B (en) | 2022-02-14 | 2022-02-14 | Airflow self-coupling melt-blowing die head for nanofiber preparation device |
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