KR101662023B1 - manufacturing process of aramid paper for enhancing dispersion force - Google Patents

manufacturing process of aramid paper for enhancing dispersion force Download PDF

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Publication number
KR101662023B1
KR101662023B1 KR1020150061121A KR20150061121A KR101662023B1 KR 101662023 B1 KR101662023 B1 KR 101662023B1 KR 1020150061121 A KR1020150061121 A KR 1020150061121A KR 20150061121 A KR20150061121 A KR 20150061121A KR 101662023 B1 KR101662023 B1 KR 101662023B1
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South Korea
Prior art keywords
filter slurry
filter
aramid
discharge port
media
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KR1020150061121A
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Korean (ko)
Inventor
한정철
박성은
김형범
박창순
곽은정
원지수
Original Assignee
주식회사 엔바이오니아
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing

Abstract

In the present invention, the aramid paper is manufactured by using the wet process but no separate spinning nozzle is used, thereby uniformly dispersing the thickness, the weight and the pore, the process time and the manufacturing cost can be remarkably reduced, The supply flow rate can be controlled according to the size of the predetermined pore through the simple operation since the supply flow rate stacked from the supply hopper to the loop plate (belt) is controlled precisely in accordance with the ascending and descending of the lifting plate. Considering the characteristics of aramid having high hydrophilicity, the prevention rolling process is divided into two stages, a roll heated to 100-150 캜 in the primary rolling process, a roll heated to 280-350 캜 in the secondary rolling process By using a roll, it is possible to effectively prevent the phenomenon that the thickness is restored when the temperature changes during the temperature change, thereby increasing the density, elongation and softening ratio To an aramid paper manufacturing process.

Description

[0001] The present invention relates to a process for producing aramid paper,

The present invention relates to a process for producing an aramid paper having an improved dispersing ability, and more particularly, to a process for producing an aramid paper having an improved dispersing ability by increasing the weight, thickness and dispersion degree of pores to increase the breaking strength and tensile strength, The present invention relates to a process for producing an aramid paper.

Background Art [0002] Paper is used for filtering fine dust and foreign matter. As interest in environmental pollution and health increases rapidly, and as components are integrated and miniaturized, paper is used for air purifiers, , The semiconductor industry, the automobile industry, and various electronic industries.

In particular, aramid paper is widely used for aerospace and military applications because of its excellent heat resistance, elasticity and strength. As the demand for aramid paper increases, various researches on aramid paper are under way.

In the conventional process for producing aramid paper, a dry process method in which molten aramid resin is injected into the air by using an apparatus such as melt-blown after melting an aramid resin has been used. However, In the manufacturing process, since the molten resin is injected into the air, the dispersing force is lowered and the weight, thickness, and pore are not uniformly distributed.

In addition, the conventional aramid paper manufacturing process through the dry process has a limitation that the original properties of the aramid resin are affected by the heat generated when the resin is melted, and the fiber prototype is destroyed.

In addition, in the conventional dry process, in order to perform the thermal fusion process for melting the aramid resin, the process is complicated, the manufacturing cost is increased, and the fiber prototype is destroyed.

In order to solve these problems, a method of producing a filter and a paper through a wet process has been studied and widely used. However, considering the properties of the aramid, which is still excellent in heat resistance and elasticity, There are insufficient studies on processes and apparatuses for producing aramid paper through the process.

1 is a side view showing a filter manufacturing apparatus disclosed in Korean Patent No. 10-0513602 (entitled " Porous filter media manufacturing apparatus and method with positive charge added "

The porous filter manufacturing apparatus 100 of FIG. 1 includes a stirrer 102 for stirring the slurry, a hopper 109 for supplying the slurry from the stirrer 102, A vacuum suction device 104 for removing water in the filter media 101 laminated on the belt 103 and a vacuum suction device 104 for removing moisture in the filter media 101 A drying device 106 for removing residual moisture in the filter media 101 that has passed through the roller pressurizing device 105 and a drying device 106 for removing residual moisture in the filter media 101, And a winding device 107 for separating the filter media 101 from the belt 103 and taking up the filter media 101 from which the residual moisture has been removed.

Also, since it is important to uniformly deposit the slurry on the belt 103 in order to produce a uniform filter media, in the prior art (100), in order to uniformly stack the slurry, a spray nozzle Lt; RTI ID = 0.0 > jets < / RTI > At this time, the injection nozzles can be uniformly stacked on the belt 103 by keeping the shape, spacing and pressure with the belt constant.

As described above, the conventional technology 100 has a merit that the process is simple, the process time is shortened, and the thickness, weight, and pore are uniformly dispersed by manufacturing the filter media by a single process line using a wet process.

However, in the prior art 100, since the molten resin is injected by the expensive nozzles, the manufacturing cost is high. When the injection is continued, the resin is clogged and clogged in the nozzle hole, Replacements and checks frequently lead to process delays.

Conventionally, as the height of the slurry deposited on the belt is directly related to the pore size and weight of the paper, the prior art (100) uses a method of 1) increasing the driving speed of the belt, 2) Method.

However, in the method 1), as the driving speed of the belt increases as the driving speed of the belt, which is one process line, increases, the speed at which the laminated slurry passes along the belt passes through the roller pressuring device 105 and the drying device 106 The desired pressurization and drying process can not be performed and the flow rate of the slurry deposited on the belt is fixed so that the process time is shorter than that of a paper process having large diameter pores in a paper process having small diameter pores There is a problem that it is excessively delayed.

Also, since the supply flow rate is proportional to the number of nozzles, the number of nozzles must be increased in order to increase the flow rate of supply, so that the manufacturing cost is further increased and the nozzle clogging occurs more frequently, So that the process time due to the process is further delayed.

Also, the prior art 100 does not include a compression process for compressing the dried slurry to a predetermined thickness when the paper is applied, and a winding process for winding the compressed paper, which is not suitable for the paper process.

In particular, the aramid paper has a small diameter fibrillated fiber to improve the filter efficiency. However, the aramid fibril fiber has the following advantages: 1) it is as soft as a sponge to have a large pore size; 2) Therefore, when the film is rolled up immediately after being rolled through rolls heated to a temperature of 280 ° C or more, there is a problem that the compressed air penetrates into the pores and the rolled thickness is restored again.

1) uniform distribution of weight, thickness, and pore; 2) minimization of multi-stage process lines; 3) precise and simple control of pore size; and 4) It is urgently required to study the manufacturing process of the aramid paper which can be efficiently performed.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide an aramid paper by using a wet process but not using a separate spinning nozzle to uniformly disperse thickness, weight and pore size, And to provide an aramid paper manufacturing process capable of significantly reducing the manufacturing cost.

Another object of the present invention is to provide an apparatus and a method for controlling a supply flow rate of a feed hopper to which a filter slurry solution is received from a loop plate (belt) And to provide an aramid paper manufacturing process capable of controlling the supply flow rate.

Further, another object of the present invention is to provide a process for producing an aramid having a high heat resistance, elasticity and hydrophilicity, characterized in that the anti-rolling process is divided into two stages and a roll heated to 100 to 150 ° C is used in the primary rolling process , A roll heated at 280 to 350 ° C. during the secondary rolling process, thereby effectively preventing the thickness from being restored during temperature change, thereby increasing the density, elongation, and softening rate of the aramid paper .

In order to achieve the above object, the present invention provides a method for producing an aramid paper, which comprises the steps of: preparing a filter composition comprising an aramid fibrid and an aramid floc prepared in advance; Agitating the dispersion slurry to prepare a filter slurry; Mixing and stirring the filter slurry produced in the filter slurry production step with water to prepare a filter slurry solution having a predetermined headbox concentration; A laminating and media forming step of laminating the filter slurry solution prepared by the mixing step into a liquid phase; A dehydrating step of removing water from the media as the filter slurry solution stacked by the lamination and media forming step; A first rolling step of rolling the dewatered media by the dewatering step to rolls heated to 100 to 150 DEG C and a second rolling step of rolling the media rolled to the rolls heated to 280 to 350 DEG C by the primary rolling step A rolling step comprising a car rolling step; And a winding step of winding the media rolled by the rolling step, wherein a calendering machine applied to the rolling step includes a plurality of rolls which are heated to 100 to 150 DEG C, A primary calendering device for preheating the received media, a secondary calendering device including a plurality of rolls heated up to 280 to 350 DEG C in a vertical direction, And a belt which is passed through the rolls of the car calendering device.

Further, in the present invention, in the laminating and media forming step, a descending steel plate for controlling the area of the discharge port is provided by raising and lowering the filter slurry solution produced by the mixing step by the power generating means while the discharge port is formed at one side portion A feeding step for feeding the hopper; A supply flow rate determining step of determining a flow rate of the filter slurry solution supplied through the discharge port of the supply hopper corresponding to a predetermined pore size; A supply flow rate control step of driving the up-down steel plate so as to discharge the filter slurry solution according to the supply flow rate determined by the supply flow rate determination step, thereby adjusting an area of the discharge port; Wherein when the up-down steel plate is moved up and down by the supply flow rate control step (S330) to the supply hopper in which the up-down steel plate is driven by the supply flow rate control step, the filter slurry solution stored in the supply hopper is discharged through the discharge port, And a laminating step of laminating the first and second substrates.

In the present invention, the filter slurry preparation step may include a step of preparing a filter composition comprising 60 to 70% by weight of an aramid fibrid and 30 to 40% by weight of an aramid floc; A dispersion liquid preparation step of producing a dispersion liquid in which water as a dissolving liquid is mixed with an acid or a dispersing agent having a concentration PH 2 to 4; And a filter slurry production step of producing a filter slurry by stirring 1.5 to 2.5% by weight of the filter composition produced by the filter composition production step and 97.5 to 98.5% by weight of the dispersion prepared by the dispersion preparation step desirable.

In addition, the web laminating apparatus applied to the lamination and media forming steps of the present invention includes a supply hopper having a receiving space formed therein for storing the filter slurry solution and forming an inclined discharge port on one side surface thereof; A vertical plate formed of a plate material and vertically installed on an upper surface of the supply hopper and installed to be able to move up and down by external drive means; An inlet path for introducing the filter slurry solution into the receiving space of the supply hopper; A roof plate formed of a plate material having a plurality of drain grooves passing through both sides thereof and having opposite ends connected to each other and spaced apart from the outlet; Wherein the filter slurry solution accommodated in the receiving space of the supply hopper is discharged to the roof plate region adjacent to the discharge port through the discharge port, It is preferable that the flow rate discharged from the plate is determined.

Also, in the present invention, it is preferable that the uplifting steel plate is vertically installed on the upper surface of the supply hopper positioned directly above the lower end of the discharge port.

Further, in the present invention, it is preferable that the discharge port of the supply hopper is inclined at 10 to 45 degrees.

In the present invention, it is preferable that the suction device applied to the dehydration step is installed at a lower portion of the roof plate adjacent to the discharge port of the supply hopper of the web lamination apparatus, and sucks the water of the filter slurry discharged to the roof plate .

Further, in the present invention, the aramid paper manufacturing process preferably further comprises a curing step after the dewatering step to heat and cure the media having undergone the dewatering step.

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By using the wet process in the present invention having the above-described problems and the solution, it is possible to uniformly disperse the thickness, weight, and pore by manufacturing the aramid paper by using no separate spinning nozzle, have.

In addition, according to the present invention, since the supply flow rate, which is stacked from the supply hopper containing the filter slurry solution, to the roof plate (belt) is precisely controlled in accordance with the ascending and descending of the ascending and descending steel plates, Can be controlled.

According to the present invention, in consideration of the characteristics of the aramid having high heat resistance, elasticity and hydrophilicity, the anti-rolling process is divided into two stages, a roll heated to 100 to 150 ° C is used in the primary rolling process, By using a roll heated to 280 ~ 350 ° C during the process, it is possible to effectively prevent the thickness from being restored when the temperature changes during the temperature change, thereby increasing the density, elongation, and softening rate.

1 is a side view showing a filter manufacturing apparatus disclosed in Korean Patent No. 10-0513602 (entitled " Porous filter media manufacturing apparatus and method with positive charge added "
FIG. 2 is a flow chart showing a process for producing an aramid paper, which is an embodiment of the present invention.
3 is a process flow chart showing the filter slurry production step of FIG.
4 is a process flow chart showing the lamination and media forming steps of FIG.
5 is a process flow chart showing the rolling step of FIG.
6 is a perspective view showing a web laminating apparatus applied to the lamination and media forming steps of FIG.
Fig. 7 is a side view of Fig. 6. Fig.
Figure 8 is a side view of the feed hopper of Figure 6;
Fig. 9 is an exemplary view for explaining the vertical steel sheet of Fig. 8. Fig.
10 is a plan view showing the roof plate of Fig.
Fig. 11 is a side view showing a calendering apparatus applied to the rolling step of Fig. 5; Fig.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a flow chart showing a process for producing an aramid paper, which is an embodiment of the present invention.

The aramid paper manufacturing process (S1) of FIG. 2 is a process for producing an aramid paper by laminating a filler slurry in which aramid fibers are dispersed at a predetermined headbox density, and then dewatering, drying, rolling (pressing) and winding.

The aramid paper manufacturing process S1 includes a filter slurry production step S10 for producing a filter slurry by dispersing and stirring aramid fibers in a dispersion liquid, a filter slurry production step S10 for producing a filter slurry, (S20) mixing the filter slurry solution with water to prepare a filter slurry solution, a lamination and media forming step (S30) of laminating the filter slurry solution prepared by the mixing step (S20) into a liquid phase, A dewatering step S40 of dewatering the laminated slurry web by the step S30, a hardening step S50 of hardening the medium having passed through the dewatering step S40, And a winding step (S70) for winding the medium that has passed through the rolling step (S60).

In this case, the aramid paper manufacturing process S1 may further include a clearing step (not shown) performed before the filter slurry manufacturing step S10, and the clearing step may include confining an aramid fibrid using a known cracking device .

The aramid resin to be used in the present invention is generally classified into an aliphatic polyamide and an aromatic polyamide. The aliphatic polyamide is a trade name of nylon and the aromatic polyamide is a trade name of aramid .

The aromatic polyamide which is an aramid has been developed to improve the heat resistance of an aliphatic polyamide and has excellent heat resistance and high tensile strength which can be used for fiber applications such as flame retardant fiber fabric and tire cord.

The aliphatic polyamide is a synthetic resin having an amide group bonded to an aliphatic hydrocarbon, and an aramid is a synthetic resin having an amide bond of 85% benzene group bonded to two aromatic rings between amide groups, and an aliphatic polyamide The aliphatic hydrocarbons easily undergo molecular motion when heat is applied, whereas the benzene rings of aromatic polyamides are rigid in molecular chains and molecules are not easily moved even when heat is applied. Therefore, they are stable to heat and have high elasticity, There are many differences.

Accordingly, in the present invention, a lamination and media forming step (S30) for laminating a slurry web using a wet process without using a nozzle is applied to uniformly disperse pores, thicknesses, and weights, A rolling step (S60) for rolling the aramid at a high density was applied.

3 is a process flow chart showing the filter slurry production step of FIG.

The filter slurry production step S10 of FIG. 3 comprises a filter composition production step S110, a dispersion production step S120 and a dispersion step S130.

The filter composition preparation step (S110) is a step of preparing an aramid paper composition comprising 60 to 70% by weight of an aramid fibrid and 30 to 40% by weight of an aramid floc.

The aramid floc is defined as a fiber having a shorter length than staple fibers, and is formed of a fiber having a diameter of 4 to 50 탆 and a fiber length of 0.5 to 15.0 mm. Specifically, the aramid floc has a diameter of 8 to 40 탆, It is preferable that the fiber is formed of a fiber length of 12 mm.

Also, aramid flocs can be made by cutting aramid fibers to short lengths without any fibrillated.

Aramid fibrids are defined as non-granular pulp or film-like particles and impart heat resistance and strength to the paper.

It is also preferable that the aramid fibrids are formed with a diameter of 25 to 38 탆 and a fiber length of 0.80 to 1.20 mm.

The aramid fibrids are also prepared using known pyridation apparatuses and can be prepared by any method in which the polymer solution is precipitated and sheared in a single step.

The dispersion preparation step (S120) is a process step of adding an acid (hydrochloric acid) or a dispersant having a concentration of PH 2 to 4 to water as a dissolution liquid and then adding the additive into a pulper to prepare a dispersion liquid.

The dispersing step S130 is a step in which the filter composition prepared by the filter composition preparing step S110 and the dispersion solution prepared by the dispersion preparing step S120 are introduced into a pulper and stirred and dispersed to prepare a filter slurry Process step. The filter slurry is preferably composed of 97.5 to 98.5% by weight of the dispersion and 1.5 to 2.5% by weight of the filter composition.

As described above, the filter slurry production step S10 produces the filter slurry through the steps of the filter composition production step S110, the dispersion production step S120 and the dispersion step S130 as shown in FIG. At this time, the filter slurry produced by the filter slurry production step (S10) is supplied to the mixing step (S20) through a conveying means such as a pipe or the like.

The mixing step S20 is a process step of mixing the filter slurry prepared in the filter slurry production step S10 of FIG. 3 with water at a preset concentration (%), which is a predetermined headbox concentration, to prepare a filter slurry solution.

Further, the filter slurry solution prepared by the mixing step S20 is supplied to the lamination and media forming step S30.

4 is a process flow chart showing the lamination and media forming steps of FIG.

The lamination and media forming step S30 is a process step of laminating the filter slurry solution prepared by the mixing step S20 into a liquid phase. At this time, the lamination and media forming step S30 is performed by the web laminating apparatus 300 of FIG. 6 to be described later.

4, the filter slurry solution produced by the mixing step S20 is moved up and down by the power generating means while the discharge port is formed on one side portion, and the area of the discharge port is set to (Supply flow rate) of the filter slurry solution supplied through the discharge port of the supply step (S310) corresponding to the predetermined pore size is determined The supply flow rate determination step S320 and the supply step S310 are performed to control the area of the discharge port so that the filter slurry solution accommodated in the supply hopper is supplied in accordance with the supply flow rate determined by the supply flow rate determination step S320, A supply flow rate control step S330 of supplying the filtered slurry solution and a filter slurry solution stored in a supply hopper driven by the downfalling steel plate by the supply flow rate control step S330 through a discharge port, And a laminating step (S340) of laminating the solution.

The dewatering step (S40) is a process step of removing moisture from the laminated slurry web by the lamination and media forming step (S30), and the dewatered media is moved to the curing step (S50).

The curing step S50 is a process step of heating the media from which water has been removed by the dewatering step S40 to cure the media, thereby removing moisture remaining in the media to firmly bond the fibers.

5 is a process flow chart showing the rolling step of FIG.

The rolling step S60 is a processing step for smoothly processing the surface of the medium while rolling the medium cured by the curing step S50 using a calendering machine to a predetermined thickness. At this time, the rolling step S60 is performed by using the calendering device 900 of FIG. 11 to be described later.

The rolling step S60 includes a first rolling step S610 in which the cured medium is passed through rolls heated to a high temperature of 100 占 폚 to 150 占 폚 by a curing step S50 for primary rolling, And a second rolling step (S620) in which the media having passed through the rollers (S610) are passed between rolls heated at a temperature of 280 to 350 DEG C to secondary roll.

Typically, the aramid has the following properties: 1) when it is rolled by rolls heated to 280 ° C or higher immediately after the curing step (S50) due to the decomposition point of 280 ° C or more, which is excellent in heat resistance, elasticity and strength, The aramid fibrids have a property of restoring the thickness after rolling due to the hydrophilic property of the end groups of the aramid fibers, 2) the aramid fibrids have elasticity like a sponge and have large pores and therefore are rolled by rolls heated to 280 ° C or higher immediately There is a problem that the cold air permeates through the pores and the thickness is restored.

The rolling step (S60) of the present invention preheats the aramid fibers by rolling using rolls heated primarily at 100 to 150 DEG C through the primary rolling step (S610) in consideration of the characteristics of the aramid fibers, The preheated media is secondarily rolled into rolls heated at 280 to 350 DEG C through a car rolling step (S620) to increase the density and elongation at the same time as the paper is produced at a predetermined thickness, and soften the texture .

The winding step S70 is a processing step of winding the paper, which is rolled by the rolling step S60, with a known winding machine.

FIG. 6 is a perspective view showing a web laminating apparatus applied to the lamination and media forming steps of FIG. 4, and FIG. 7 is a side view of FIG. 6. FIG.

The web laminating apparatus 300 of Figures 6 and 7 is an apparatus for laminating the filter slurry solution produced by the mixing step S20 onto the top of the roof plate 306 without using a spinning nozzle.

The web laminating apparatus 300 further includes a supply hopper 301 having a discharge port 331 formed at one side thereof (hereinafter referred to as a front surface) and a housing space 321 formed therein and having a front surface formed as an inclined surface, And is raised vertically by an external driving means (not shown) so as to flow the filter slurry solution into the ascending and descending portion 303 and the containing space 321 of the supply hopper 301 The supply hopper 301 is provided with an inlet path 304 and a sloping discharge port 331 formed on the front surface of the supply hopper 301 formed by a plate member connected to both ends thereof, A loop section 306 in which a filter slurry solution to be discharged is stacked in a liquid phase on an upper surface thereof, a rotation section 307 which loops the loop plate 306 and an outlet section 331 of a feed hopper 301, The loop plate 306 is provided at the lower portion of the loop plate 306, A suction unit 308 for sucking the moisture from the suction unit 308 and a roof plate 306 and a suction unit 308 formed on the ground along the path of the roof plate 306, And a storage portion 309 in which water to be treated is received.

The web stacking apparatus 300 configured as described above is supplied with the filter slurry solution flowing into the accommodation space 321 through the inflow path 304 and is accommodated in the accommodation space 321 and is moved forward Is moved to the front of the supply hopper 301 and stacked on the upper surface of the roof plate 306 through the discharge opening 331 formed at an angle to the feed hopper 301. [

At this time, the thickness of the slurry web stacked by the loop plate 306 changes according to the supply flow rate supplied from the supply hopper 301, and the deformation of the thickness determines the size of the pores, Flow rate should be precisely controlled.

Accordingly, the web laminating apparatus 300 according to the present invention is configured to adjust the supply flow rate through the control of the ascending / descending control of the ascending and descending plate 303, so that the supply flow rate Can be efficiently controlled. At this time, in the control method of the supply flow rate using the change of the loop plate moving speed, the suction process time of the suction unit 308 is changed according to the moving speed of the loop plate, and since the suction process time affects the density of the minute minute, Thereby causing a problem that the inherent performance and function can not be expected.

Also, the inclination angle of the discharge port 331 of the supply hopper 301 and the roof plate 306 is preferably 10 to 45 degrees. At this time, if the inclination angle of the discharge port 331 and the roof plate 306 is 45 degrees or more, the filter sheets of the filter slurry solution discharged to the top surface of the roof plate become excessively inclined, The lamination process can not be efficiently performed.

Further, the moisture of the filter slurry solution stacked on the roof plate 306 is drained to the lower portion of the roof plate 306 through drain grooves (not shown), and the filter compositions (fibers) of the filter slurry solution do not pass through the drain grooves And is deposited on top of the roof plate 306 in a state where it can not be used. The suction portion 308 provided at the lower portion of the roof plate 306 immediately below the discharge port of the supply hopper 301 sucks the moisture of the filter slurry solution formed on the roof plate 306, A dehydration step (S40) for removing water efficiently is performed.

At this time, the suction unit 308 includes a plurality of suctions to dewater the slurry web laminated on the upper surface of the roof plate 306, and in detail, the sound pressure is preferably 10 to 100 kPa.

Fig. 8 is a side view showing the feed hopper of Fig. 6, and Fig. 9 is an illustrative view for explaining the descending steel sheet of Fig. 8. Fig.

As shown in FIGS. 8 and 9, the supply hopper 301 is formed of a housing having a front surface formed with an inclined surface and a discharge opening 331 formed in an inclined surface, and a receiving space is formed therein. At this time, the discharge port 331 is formed from the lower end of the front surface of the supply hopper 301 to a point adjacent to the upper end.

Further, the discharge port 331 formed on the front surface of the supply hopper 301 is inclined so as to be directed inward from the upper part to the lower part. At this time, a loop plate 306, which is upwardly moved by the rotation part 307, is installed at an inclined position in front of the discharge port 331, so that the filter slurry solutions accommodated in the accommodation space and discharged to the roof plate 306 through the discharge port 331, And is stacked on the upper surface of the plate 306.

The supply hopper 301 is provided with a lifting plate 303 on the upper surface thereof and the lifting plate 303 is formed of a plate material and installed vertically on the upper surface of the upper portion of the lower end of the discharging opening 331.

As shown in Fig. 9, the up-down steel plate 331 is provided on the upper surface of the supply hopper 301 so that the up-down steel plate 331 can be raised and lowered by external drive means (not shown) The separation distance D between the front end portion P1 of the bottom plate and the front end portion P2 of the bottom surface becomes small and the distance D ' Is increased.

The separation distance D between the end portion P1 of the ascending and descending steel plate 331 and the tip end portion P2 of the lower surface determines the flow rate of the filter slurry solution discharged to the roof plate 306, The supply flow rate can be precisely controlled according to the height.

10 is a plan view showing the roof plate of Fig.

10 is formed in a plate shape in which a plurality of drain grooves 370 passing through both sides are formed, and one end and the other end of the loop plate 306 are coupled to each other and are loop-rotated by the rotation unit 307. [ Preferably, the drain groove 370 is formed with a small diameter so that the filter compositions of the filter slurry do not pass, that is, only the water of the filter slurry is passed therethrough.

The loop plate 306 is inclined corresponding to the inclination angle of the discharge port 331 of the supply hopper 301 and is spaced apart from the discharge port 331 by a predetermined distance so that the discharge port 331 of the supply hopper 301 So that the filter slurry solution discharged through the filter slurry is stacked on top. At this time, the moisture of the filter slurry solution stacked on the top of the roof plate 306 is drained downward through the drain grooves 370 of the roof plate 306, thereby forming a filter slurry solution (Fibers) are stacked.

The inclined surface of the roof plate 306 is moved from the lower part to the upper part by the rotation part 307 so that the filter slurry solution discharged through the discharge port 331 of the supply hopper 301 is laminated.

The suction portion 308 of FIG. 6 is coupled to the supply hopper 301 so as to be disposed immediately below the discharge port 331 of the supply hopper 301.

The suction portion 308 also includes a plurality of suctions for vacuum suction of components such as gas, air, and moisture in a specific direction as known in the art, and the suction direction is directed toward the roof plate 306, Thereby efficiently removing the moisture of the filter slurry discharged to the upper portion of the roof plate 306. [

As described above, the web laminating apparatus 300 according to the present invention greatly increases the thickness, weight and dispersing power of the pores of the fiber by stacking the filter slurry solution in a liquid state with a simple structure, and at the same time, And it is possible to precisely control the supply flow rate according to the rising / falling height of the up / down steel plate without using the change of the moving speed of the precision loop plate. Therefore, The efficiency of the apparatus can be remarkably increased.

Fig. 11 is a side view showing a calendering apparatus applied to the rolling step of Fig. 5; Fig.

The calendering apparatus 900 of FIG. 11 is applied to the rolling step S60 of FIG. 5 to roll the media having passed through the curing step S50 to form the medium to a thin thickness, increase the density and elongation, It is a device for softening tissue.

The calendering apparatus 900 further includes a primary calendering apparatus 910 applied to the primary rolling step S610, a secondary calendering apparatus 920 applied to the secondary rolling step S620, And a belt 930 which rotates in an infinite loop by receiving media supplied to the primary calendering device 910 and the secondary calendering device 920. In the present invention, for convenience of explanation, the primary calendering apparatus 910 is composed of three rolls 911 and the secondary calendering apparatus 920 is composed of two rolls 921. For example, The number of rolls is not limited thereto.

The primary calendering device 910 includes rolls 911 which are heated to 100 to 150 ° C and are sequentially installed in the up and down direction, and the media passes between rolls 911 that are adjacent in the direction from the top to the bottom Rolled.

The primary calendering device 910 also preheats the aramid fibers as the rolls 911 are heated to 100-150 < 0 > C. At this time, as described above, the aramid fiber is formed by rolls heated to 280 ° C or higher immediately after the curing step (S50) due to 1) excellent decomposition point at which the fiber has excellent heat resistance, elasticity and strength, When rolled, it has a property that the thickness is restored after rolling due to the hydrophilic property of the end group of the aramid fiber. 2) Since the aramid fibrids have elasticity like a sponge and have large pores, There is a problem that the cold air permeates through the pores and the thickness is restored.

That is, in the present invention, by preheating the aramid fibers by using the primary calendering apparatus 910, it is possible to solve the problem of restoring the thickness that occurs when the aramid fibers are immediately rolled into rolls of 280 ° C.

The media having passed through the primary calendering device 910 is also conveyed along the belt 930 to the secondary calendering device 920.

The secondary calendering device 920 includes rolls 921 which are heated to 280 to 350 ° C and installed in the vertical direction.

In addition, the secondary calendering apparatus 920 heats the aramid to 280 ~ 350 ° C corresponding to 280 ° C, which is a decomposition point having flexibility, so that the primary rolled paper is formed to have a predetermined thickness and the density and elongation And soften the tissue.

300: web laminator 301: feed hopper 303:
304: Inflow path 306: Loop plate 307: Rotation part
308: Suction section 309: Storage section 331:
900: calendering device 910: primary calendering device 911: roll
920: secondary calendering device 921: roll

Claims (10)

A process for producing aramid paper for producing aramid paper comprising:
A filter slurry production step of agitating the filter composition comprising the previously prepared aramid fibrid and aramid floc in a dispersion to prepare a filter slurry;
Mixing and stirring the filter slurry produced in the filter slurry production step with water to prepare a filter slurry solution having a predetermined headbox concentration;
A laminating and media forming step of laminating the filter slurry solution prepared by the mixing step into a liquid phase;
A dehydrating step of removing water from the media as the filter slurry solution stacked by the lamination and media forming step;
A first rolling step of rolling the dewatered media by the dewatering step to rolls heated to 100 to 150 DEG C and a second rolling step of rolling the media rolled to the rolls heated to 280 to 350 DEG C by the primary rolling step A rolling step comprising a car rolling step;
And a winding step of winding the rolled media by the rolling step,
The calendering machine applied to the rolling step includes a primary calendering device which is heated to 100 to 150 ° C and includes a plurality of rolls installed up and down to preheat the supplied media, A secondary calendering device including a plurality of rolls that are heated and mounted in an up and down direction and a belt for passing the supplied media to the rolls of the primary calendaring device and the secondary calendering device Aramid paper manufacturing process. The method of claim 1, wherein the stacking and media forming step
A supply step of supplying the filter slurry solution produced by the mixing step to a supply hopper in which a discharge port is formed in one side portion and a rising plate is provided for controlling the area of the discharge port by raising and lowering by a power generating means;
A supply flow rate determining step of determining a flow rate of the filter slurry solution supplied through the discharge port of the supply hopper corresponding to a predetermined pore size;
A supply flow rate control step of driving the up-down steel plate so as to discharge the filter slurry solution according to the supply flow rate determined by the supply flow rate determination step, thereby adjusting an area of the discharge port;
Wherein the supply flow rate control step controls the supply hopper
And a laminating step of laminating the filter slurry solution by discharging the filter slurry solution stored in the supply hopper through the discharge port when the up-down steel plate is moved up and down by the supply flow rate controlling step (S330) . The method of claim 2, wherein the filter slurry manufacturing step
60 to 70% by weight of an aramid fibrid and 30 to 40% by weight of an aramid floc;
A dispersion liquid preparation step of producing a dispersion liquid in which water as a dissolving liquid is mixed with an acid or a dispersing agent having a concentration PH 2 to 4;
And a filter slurry production step of producing filter slurry by stirring 1.5 to 2.5% by weight of the filter composition prepared by the filter composition production step and 97.5 to 98.5% by weight of the dispersion prepared by the dispersion preparation step An aramid paper manufacturing process characterized by. [Claim 4] The web laminating apparatus according to claim 3,
A supply hopper for storing the filter slurry solution and having an inclined discharge port formed at one side thereof;
A vertical plate formed of a plate material and vertically installed on an upper surface of the supply hopper and installed to be able to move up and down by external drive means;
An inlet path for introducing the filter slurry solution into the receiving space of the supply hopper;
A roof plate formed of a plate material having a plurality of drain grooves passing through both sides thereof and having opposite ends connected to each other and spaced apart from the outlet;
And a rotating portion for moving the loop plate upward,
Wherein the filter slurry solution accommodated in the accommodating space of the supply hopper is discharged to the roof plate region adjacent to the discharge port through the discharge port and the flow rate discharged to the roof plate is determined according to the ascending / descending height of the ascending / descending plate. Aramid paper manufacturing process. The process according to claim 4, wherein the up-and-down steel plate is vertically installed on the upper surface of the supply hopper, which is located directly above the lower end of the discharge port. 6. The process of claim 5, wherein the outlet of the feed hopper is inclined at 10 to 45 degrees. The web stacking apparatus according to claim 6, wherein the suction device applied to the dehydrating step is installed at a lower portion of the roof plate adjacent to the discharge port of the supply hopper of the web laminating apparatus to suck the water of the filter slurry discharged to the roof plate Wherein the aramid paper is produced by a process comprising the steps of: [Claim 7] The aramid paper manufacturing process according to claim 7, wherein the aramid paper manufacturing process further comprises a curing step after the dewatering step to heat and cure the dewatered media. delete delete
KR1020150061121A 2015-04-30 2015-04-30 manufacturing process of aramid paper for enhancing dispersion force KR101662023B1 (en)

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Publication number Priority date Publication date Assignee Title
CN113811377A (en) * 2019-04-05 2021-12-17 奥斯龙-明士克公司 Smoke filter medium
KR102657574B1 (en) * 2019-04-05 2024-04-16 알스트롬 오와이제이 flue gas filtration media

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Publication number Priority date Publication date Assignee Title
JP2001062821A (en) * 1999-08-24 2001-03-13 Matsushita Electric Works Ltd Slurry supplying device
KR20050071531A (en) * 2002-10-01 2005-07-07 이 아이 듀폰 디 네모아 앤드 캄파니 Formation of aramid paper laminate
KR101323181B1 (en) * 2013-01-28 2013-10-30 주식회사 엔바이오니아 Laminating apparatus of fiber layer and method of filter medium with multi-layer therefor
KR20140134874A (en) * 2013-05-15 2014-11-25 주식회사 휴비스 Electroconductive Aramid Paper Having Excellent Tensile Strength

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001062821A (en) * 1999-08-24 2001-03-13 Matsushita Electric Works Ltd Slurry supplying device
KR20050071531A (en) * 2002-10-01 2005-07-07 이 아이 듀폰 디 네모아 앤드 캄파니 Formation of aramid paper laminate
KR101323181B1 (en) * 2013-01-28 2013-10-30 주식회사 엔바이오니아 Laminating apparatus of fiber layer and method of filter medium with multi-layer therefor
KR20140134874A (en) * 2013-05-15 2014-11-25 주식회사 휴비스 Electroconductive Aramid Paper Having Excellent Tensile Strength

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113811377A (en) * 2019-04-05 2021-12-17 奥斯龙-明士克公司 Smoke filter medium
CN113811377B (en) * 2019-04-05 2023-06-20 奥斯龙-明士克公司 Flue gas filter medium
KR102657574B1 (en) * 2019-04-05 2024-04-16 알스트롬 오와이제이 flue gas filtration media

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