KR20230089368A - Flash-Spun Apparatus with Cleaning Means and Method Thereof - Google Patents

Abstract

The present invention relates to a flash spinning device and method provided with a cleaning means. Since it is configured to remove residues remaining on the web former belt using the cleaning means, there is an effect of keeping the surface of the conveyor belt clean at all times. The present invention comprises: a nozzle that forms filaments by extruding and spinning supercritical fluid mixed with solvent and high molecular weight polymer; a rotating reflector that is positioned to face the nozzle, collides with the filament radiating from the nozzle to form a web, and guides the web in a downward direction; a conveyor belt in which webs whose travel paths have changed by colliding with the rotating reflector are stacked to form a sheet; and a rolling unit that unwinds the sheets stacked on the conveyor belt.

Description

Flash-Spun Apparatus with Cleaning Means and Method Thereof

The present invention relates to a flash spinning apparatus and method having a cleaning means, and more particularly, cleaning to improve the quality of a nonwoven fabric sheet by enabling easy removal of residue remaining on a conveyor belt of a webformer It relates to a flash emission device and method having means.

The present invention relates to a flash spinning device, and flash spinning is a modified form of spunbond technology. After melting and extruding a polymer such as propylene, the solvent is evaporated immediately after being detained, so that individual fibers are formed in the form of fibrils on a lower conveyor belt ( moving screen) to form a network structure. Flash spinning has been used to produce plexifilament film-fibril strands composed of microfibers.

1 is an example of a conventional flash spinning apparatus, and a conventional nonwoven fabric manufacturing apparatus through flash spinning includes a nozzle 1, a rotating reflector 8, a corona discharge device 13, and a webformer (reference numerals not shown) as main components. and a rolling part 42 .

The instant the mixture of polymer and solvent in the supercritical fluid state is emitted into the air through the nozzle 1, the solvent vaporizes and evaporates, and the polymer becomes a filament. (web) is formed. After the web is opened in the corona discharge device 13, the web is laminated on the conveyor belt of the webformer to be manufactured into a sheet shape, and then rolled in the rolling unit 42 to be stored and sold in a cylindrical shape.

At this time, some scraps and fragments of the web or sheet laminated on the conveyor belt may remain on the conveyor belt without being unwound to the rolling unit 42 . Residues that are not unwound on the rolling part 42 as such have adverse effects on web lamination and sheet formation, so they must be removed from the conveyor belt. To this end, in the prior art, not only is the inconvenience of cleaning the conveyor belt directly by the operator using a brush, but the brush removes the residue remaining on the conveyor belt while in contact with the surface of the conveyor belt, which can wear the conveyor belt There are downsides.

Korean Patent Publication No. 1999-0067085

An object of the present invention to solve the problems of the prior art as described above is a flash spinning apparatus and method having a cleaning means to improve the quality of the sheet by easily removing the residue remaining on the conveyor belt is to provide

In order to achieve the above object, the present invention provides a nozzle for forming a filament by extruding and spinning a supercritical fluid in which a solvent and a polymer are mixed; a rotating reflector positioned to face the nozzle, forming a web by colliding filaments emitted from the nozzle, and guiding the web in a downward direction; A conveyor belt for forming a sheet by stacking the web whose traveling path is changed by colliding with the rotating reflector; and a rolling unit for unwinding the sheets stacked on the conveyor belt, and a cleaning unit disposed on one side of the conveyor belt to remove residues remaining unwound on the rolling unit among the webs stacked on the conveyor belt. It provides a flash emission device having a cleaning means characterized in that it comprises.

In particular, the cleaning means includes a cleaning unit installed to be spaced apart from the rear of the conveyor belt located in a direction opposite to the rolling unit, and the cleaning unit discharges or sucks air in the direction of the conveyor belt to remain on the conveyor belt. A flash spinning apparatus having a cleaning means characterized in that it removes residues is provided.

In particular, the cleaning means includes a cleaning unit installed to be spaced diagonally upward from an upper rear edge of the conveyor belt located in a direction opposite to the rolling unit, and the cleaning unit discharges or sucks air in the direction of the conveyor belt to clean the air. Provided is a flash spinning apparatus having a cleaning means characterized in that it removes the residue remaining on the conveyor belt.

In particular, the conveyor belt is formed in a mesh shape, a negative pressure means is installed inside between the upper and lower sides of the conveyor belt, and the negative pressure forming unit is directed from one side of the negative pressure forming unit facing the upper side of the conveyor belt to the other side of the negative pressure forming unit. Air is discharged so that a negative pressure atmosphere is formed on the upper surface of the conveyor belt, and the fibers stacked on the upper surface of the conveyor belt are in close contact with the upper surface of the conveyor belt by the negative pressure atmosphere formed on the upper surface of the conveyor belt. Provided is a flash spinning apparatus having a cleaning means characterized in that it moves in the direction of the rolling part.

In addition, the present invention is a spinning process of forming a filament by extrusion spinning a supercritical fluid in which a solvent and a polymer are mixed from a nozzle; a web forming process of colliding the filaments emitted from the nozzle with a rotating reflector to form a web having a predetermined width; A web lamination process of forming sheet-type fibers by laminating fibers having a changed travel path on a conveyor belt; a rolling process of unwinding the fibers stacked on the conveyor belt to a rolling unit; and a cleaning process in which the cleaning means located on one side of the conveyor belt removes residues remaining without being unwound to the rolling unit among the fibers stacked on the conveyor belt. A flash emission method is provided.

In particular, in the cleaning process, the cleaning unit of the cleaning means installed to be spaced apart from the rear of the conveyor belt located in the opposite direction to the rolling unit discharges or sucks air in the direction of the conveyor belt to remove residues remaining on the conveyor belt. can be removed.

In particular, the cleaning process includes a cleaning unit installed to be spaced diagonally upward from an upper rear corner of the conveyor belt located in a direction opposite to the rolling unit, and the cleaning unit discharges or sucks air in the direction of the conveyor belt to clean the air. Residues remaining on the conveyor belt can be removed.

Since the present invention is configured to remove residues remaining on the belt using a cleaning means, there is an effect of always keeping the surface of the belt clean.

In addition, since the cleaning means uses air to remove residues remaining on the belt, there is no need to replace the brushes periodically because there is no use of brushes, and the problem of brushes getting caught on the conveyor belt and the belt abrasion caused by the brushes is eliminated. There is an effect that does not occur.

1 is a diagram for explaining a conventional flash radiation device.
2 is a diagram schematically shown to explain a flash radiation device having a cleaning means according to a preferred embodiment of the present invention.
3 is a perspective view schematically illustrating a webformer of a flash emission device having a cleaning means according to a preferred embodiment of the present invention.
4 is a cross-sectional view schematically shown to explain an example of a collining means of a flash spinning apparatus having a cleaning means according to a preferred embodiment of the present invention.
5 is a cross-sectional view schematically shown to explain another example of a collining means of a flash spinning apparatus having a cleaning means according to a preferred embodiment of the present invention.
6 is a diagram for explaining a flash emission method including a cleaning means according to a preferred embodiment of the present invention.

Hereinafter, a flash emission device and method including a cleaning means according to a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

2 is a diagram schematically shown to explain a flash radiation device having a cleaning means according to a preferred embodiment of the present invention.

Referring to FIG. 2, a flash spinning apparatus having a cleaning means according to a preferred embodiment of the present invention includes a nozzle 100, a rotating reflector 200, a corona discharge device 300, a webformer, and a rolling unit 600. include

A supercritical fluid of a solvent and a polymer is extruded and spun through the nozzle 100 to form a filament. That is, when the mixture is spun through the nozzle 100, the solvent is instantly evaporated, and the polymer is formed into a filament similar to a thread.

The rotary reflector 200 is positioned to face the nozzle 100, and the filaments emitted from the nozzle 100 collide with the rotary reflector 200 to form a reticulated web. The shape of the rotary reflector 200 is formed, for example, as a disc, but the front side facing the nozzle 100 may protrude toward the nozzle 100 toward the center. In addition to this, the rotary reflector 200 may be formed in various ways. Meanwhile, the rotary reflector 200 may be configured to tilt or pivot up and down, left and right, as well as a rotation function.

The corona discharge device 300 is positioned between the rotary reflector 200 and the conveyor belt 400, and includes a ground electrode 310 and a needle electrode 320 spaced apart so as to face each other. The fibers moving in the direction of the conveyor belt 400 from the rotary reflector 200 pass between the ground electrode 310 and the needle electrode 320, and at this time, the high voltage of the ground electrode 310 and the needle electrode 320 By applying static electricity to the web, the web is opened by mutual repulsive force.

The webformer may include a conveyor belt 400, a cleaning means, and a negative pressure means 500. The conveyor belt 400 collides with the rotating reflector 200 to form a sheet by stacking a plurality of webs whose travel path is changed. The cleaning means of the present invention is for removing residues remaining without being unwound by the rolling unit 600 among the fibers stacked on the conveyor belt 400, the first cleaning unit 450 or the second cleaning unit 452 includes The negative pressure means 500 allows a negative pressure atmosphere to be formed on the upper surface of the conveyor belt 400 . The conveyor belt 400, the first and second cleaning units 450 and 452, and the negative pressure means 500 will be described later.

The rolling unit 600 unwinds the sheets stacked on the conveyor belt 400 in a roll form to form a nonwoven fabric. The nonwoven fabric formed in this way may be adjusted in flexibility, water permeability, air permeability, and the like by adding a predetermined process.

3 is a perspective view schematically illustrating a webformer of a flash emission device having a cleaning means according to a preferred embodiment of the present invention.

2 and 3, the webformer includes a conveyor belt 400 positioned to be spaced apart from the lower side of the rotary reflector 200, and further includes a negative pressure means 500 positioned inside the conveyor belt 400. can do.

The conveyor belt 400 includes a pair of upper rollers 420 and 422 spaced apart from each other and a pair of lower rollers 424 and 426 spaced apart from each other and positioned below the pair of upper rollers 420 and 422 to be spaced apart from each other. ) And, it is formed in the form of an endless track, and a pair of upper rollers 420 and 422 and a pair of lower rollers 424 and 426 are positioned on the upper and lower sides of the inside, so that the upper rollers 420 and 422 and the lower rollers It includes a belt 410 receiving rotational power from (424, 426). The belt 410 is formed in a mesh shape, and a plurality of mesh holes 412 are formed along the longitudinal direction. The belt 410 is rotated by the rotation of the upper rollers 420 and 422 and the lower rollers 424 and 426. The fibers colliding with the rotary reflector 200 are laminated on the upper surface of the belt 410 to form a sheet. At this time, a material for canceling the electric charges charged on the fibers may be coated on the upper surface of the belt 410 . Accordingly, the fibers stacked on the upper surface of the belt 410 are transported along the belt 410 in the direction of the rolling part 600 while maintaining the sheet shape without being separated to the outside. And the thickness of the sheet is adjusted by the rotational speed of the belt 410. Meanwhile, in order to transfer the belt 410 in the longitudinal and vertical directions, the upper rollers 420 and 422 and the lower rollers 424 and 426 may be configured to move left and right. When the belt 410 is transferred in the longitudinal and vertical directions, that is, left and right, the width of the sheet formed on the belt 410 is adjusted.

The negative pressure means 500 is installed between the upper and lower sides of the belt 410 so that a negative pressure atmosphere is formed on the upper surface of the belt 410. It includes section 510. In the negative pressure forming unit 510, a negative pressure passage 520 is formed on the upper side facing the upper side of the belt 410, and air is discharged from the upper side of the negative pressure passage 520 to the side to form a negative pressure atmosphere on the upper surface of the belt 410. to form Then, due to the negative pressure atmosphere formed on the upper surface of the belt 410, the fibers stacked on the upper surface of the belt 410 are moved toward the rolling part 600 while being in close contact with the upper surface of the belt 410.

Since the fibers laminated on the upper surface of the belt 410 are maintained in close contact with the upper surface of the belt 410 by the negative pressure means 500, the fibers laminated on the belt 410 are rolled in a sheet form by the rolling part 600. There is an effect of maintaining a uniform shape without the shape of the sheet being arbitrarily tilted to one side or leaving the seat while moving in the direction.

Meanwhile, since the upper rollers 420 and 422 and the lower rollers 424 and 426 are spaced apart from each other, the inside of the belt 410 is spaced apart by the distance between the upper rollers 420 and 422 and the lower rollers 424 and 426. An empty space is formed. As such, since the upper rollers 420 and 422 and the lower rollers 424 and 426 are positioned so as to be spaced apart, an empty space is formed inside the belt 410, and the negative pressure means 500 is formed in the empty space inside the belt 410 thus formed. There is an effect that can be easily positioned.

4 is a cross-sectional view schematically shown to explain an example of a cleaning means of a flash spinning apparatus having a cleaning means according to a preferred embodiment of the present invention.

Referring to FIG. 4 , some of the webs laminated on the belt 410, fiber residues, and fragments may remain on the belt 410 without being unwound to the rolling unit 600. Residues that are not unwound on the rolling part 600 and remain on the rolling part 600 adversely affect sheet formation, so they must be quickly removed from the belt 410. To this end, a cleaning means is located on one side of the belt 410 . The cleaning unit may include, for example, the first cleaning unit 450 . The first cleaning unit 450 is installed to be spaced apart from the rear of the belt 410 located in the opposite direction of the rolling unit 600 . The first cleaning unit 450 may be installed at a position slightly lowered from an imaginary line (not shown) extending from the upper side of the belt 410, and discharges or sucks air in the direction of the belt 410 to clean the belt ( 410) to remove the residue remaining. As described above, since the present invention is configured to remove residue remaining on the belt 410 using the first cleaning unit, the surface of the belt 410 can always be kept clean.

5 is a cross-sectional view schematically shown to explain another example of a cleaning means of a flash spinning apparatus having a cleaning means according to a preferred embodiment of the present invention.

Referring to FIG. 5 , the cleaning unit may include, for example, a second cleaning unit 452 . The second cleaning unit 452 is installed to be spaced apart from the rear of the belt 410 located in the opposite direction of the rolling unit 600 .

The second cleaning unit 452 may be installed at a position spaced diagonally upward from the upper edge of the belt 410, and discharges or sucks air in the direction of the belt 410 to remove residue remaining on the belt 410. Water can be removed cleanly. In addition, the second cleaning unit 452 can be rotated so that the angle of the second cleaning unit 452 can be adjusted.

Hereinafter, a flash emission method including a cleaning means according to a preferred embodiment of the present invention will be described.

6 is a diagram for explaining a flash emission method including a cleaning means according to a preferred embodiment of the present invention.

Referring to FIG. 6, a flash spinning method having a cleaning means according to a preferred embodiment of the present invention includes a spinning process (S10) of forming a filament by extruding and spinning a supercritical fluid in which a solvent and a polymer are mixed from a nozzle; A web forming process (S20) of forming a web of a certain width by colliding the filaments emitted from the nozzle with a rotating reflector; A corona discharge process (S30) of obtaining an opening effect by imparting static electricity to the web through a corona discharge device; A web lamination process (S40) of forming a sheet shape by laminating a web on a conveyor belt; A rolling process (S50) of unwinding the sheets stacked on the conveyor belt to a rolling unit; and a cleaning process (S60) in which a cleaning means located on one side of the conveyor belt removes residues remaining without being unwound on the rolling part among the fibers stacked on the conveyor belt. do.

The spinning process (S10) and the web forming process (S20) mean filament formation by nozzle spinning and web formation by collision with the rotary reflector, respectively, and the corona discharge process (S30) is by applying static electricity to the web through a corona discharge device. This is the process of obtaining the opening effect of the web.

In the lamination process (S40), the negative pressure means 500 installed inside between the upper and lower sides of the conveyor belt 400 forms a negative pressure atmosphere on the upper surface of the conveyor belt 400, so that the fibers are laminated on the conveyor belt 400 It may include a negative pressure step of adhering to the upper surface of the conveyor belt 400 and a moving step of rotating the conveyor belt 400 to move the fibers adhered to the upper surface of the conveyor belt 400 in the direction of the rolling unit 600. .

In the rolling process (S50), when a plurality of webs are stacked to form a sheet, a rolling unit formed at the rear end of the webformer rolls the nonwoven fabric in the form of a sheet to produce a product.

In the cleaning process (S60), the first cleaning unit (450: shown in FIG. 4) or the second cleaning unit (450: shown in FIG. 452 (shown in FIG. 5) is configured to remove residue remaining on the conveyor belt 400 by discharging or sucking air in the direction of the conveyor belt 400.

Although the present invention has been described in detail in the above embodiments, it is obvious that the present invention is not limited thereto, and various changes and modifications are possible within the scope of the technical idea of the present invention. If it falls within the scope of the claims, the technical idea should also be regarded as belonging to the present invention.

100: nozzle 200: rotary reflector
300: corona discharge device 310: ground electrode
320: needle electrode 400: conveyor belt
410: belt 412: mesh hole
420, 422: upper roller 424, 426: lower roller
450: first cleaning unit 452: second cleaning unit
500: negative pressure means 510: negative pressure forming unit
520: negative pressure flow path 600: rolling part

Claims (7)

A nozzle for forming a filament by extruding and spinning a supercritical fluid in which a solvent and a polymer are mixed;
a rotary reflector positioned to face the nozzle, form a web by colliding with filaments emitted from the nozzle, and guide the web in a downward direction;
A conveyor belt for forming a sheet by stacking the web whose traveling path is changed by colliding with the rotating reflector; and
And a rolling unit for unwinding the sheets stacked on the conveyor belt,
The flash spinning apparatus having a cleaning means, characterized in that it further comprises a cleaning means located on one side of the conveyor belt to remove residues remaining unwound on the rolling part among the webs stacked on the conveyor belt.
The method of claim 1, wherein the cleaning means includes a cleaning unit installed to be spaced apart from the rear of the conveyor belt, and the cleaning unit discharges or sucks air toward the conveyor belt to remove residue remaining on the conveyor belt. A flash emission device having a cleaning means characterized in that.
The cleaning unit of claim 1, wherein the cleaning unit includes a cleaning unit installed to be spaced diagonally upward from an upper rear corner of the conveyor belt, and the cleaning unit discharges or sucks air in the direction of the conveyor belt to remove residue remaining on the conveyor belt. Flash spinning apparatus having a cleaning means characterized in that to remove water.
The method of claim 1, wherein the conveyor belt is formed in a mesh shape, a negative pressure means is installed between the upper and lower sides of the conveyor belt, and the negative pressure forming unit is at one side of the negative pressure forming unit facing the upper side of the conveyor belt. Air is discharged in the other direction so that a negative pressure atmosphere is formed on the upper surface of the conveyor belt, and the fibers stacked on the upper surface of the conveyor belt are in close contact with the upper surface of the conveyor belt by the negative pressure atmosphere formed on the upper surface of the conveyor belt. A flash spinning device having a cleaning means, characterized in that moved in the direction of the rolling part in the state.
A spinning process in which a supercritical fluid in which a solvent and a polymer are mixed is extruded and spun from a nozzle to form a filament;
a web forming process of colliding the filaments emitted from the nozzle with a rotating reflector to form a web having a predetermined width;
A web lamination process of forming sheet-type fibers by laminating fibers having a changed travel path on a conveyor belt;
a rolling process of unwinding the fibers stacked on the conveyor belt to a rolling unit; and
and a cleaning process in which a cleaning means located on one side of the conveyor belt removes residues remaining without being unwound to the rolling unit among the fibers stacked on the conveyor belt.
[Claim 6] The cleaning process of claim 5, wherein, in the cleaning process, the cleaning part of the cleaning means installed to be spaced apart from the rear of the conveyor belt located in a direction opposite to the rolling part discharges or sucks air in the direction of the conveyor belt and remains on the conveyor belt. A flash spinning method characterized in that for removing residues that do.
The cleaning process of claim 5, wherein the cleaning unit comprises a cleaning unit installed to be spaced diagonally upward from an upper rear edge of the conveyor belt located in a direction opposite to the rolling unit, and the cleaning unit discharges air in the direction of the conveyor belt or Flash spinning method, characterized in that by suction to remove the residue remaining on the conveyor belt.

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