KR101594354B1 - HEPA filter of multi-layered structure for joining ultrasonic and method therefor - Google Patents

Abstract

The present invention can reduce pressure loss compared to a filter material having a single-layer structure by forming a multilayer structure in which a plurality of fibrous layers are laminated, and can dramatically increase the collection efficiency. The first fiber layer, which is ultrasonically fused to other non- In order to solve the problem that bonding with other nonwoven fabric is not achieved when the composition is composed only of glass fiber, adhesion of the nonwoven fabric to the other nonwoven fabric can be remarkably increased by mixing an appropriate ratio of synthetic fibers to the first fiber layer Since the first filter slurry and the second filter slurry forming the first fiber layer and the second fiber layer are laminated in the liquid phase, the interlaminar bond force is excellent without any other means such as needle punching or thermal fusing, And the first filter slurry may have a headbox concentration of 0.03 to 0.06 mass% , And the second filter slurry is laminated at a head box density of 0.05 to 1.00 mass%, whereby the first fiber layer functions as a balmy layer and the second fiber layer functions as a dense layer, The present invention relates to a medical hepafilter filter medium having a multi-layered structure capable of achieving the above object and a method for manufacturing the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a multi-layered medical hepafilter filter material capable of ultrasonic welding and a method for manufacturing the same.

More particularly, the present invention relates to a medical hepafilter filter material having a multi-layer structure capable of ultrasonic welding, and more particularly, The present invention relates to a medical filter material for medical use having a multi-layered structure capable of being bonded by ultrasonic welding capable of enhancing the adhesiveness of the first fiber layer which is contacted with the other nonwoven fabric, and a method for manufacturing the same.

BACKGROUND ART Medical devices such as laser, electric gauze and ultrasonic cutter are widely used for cutting, cutting and hemostasis in a variety of fields such as surgery, dermatology and plastic surgery. (Hereinafter referred to as noxious gas for surgical operation) due to vaporization and destruction thereof.

Such noxious gas for surgical operation interferes with the field of view of the surgical site, causing a delay in the operation time and generating malodorous odor, and carbon monoxide, particulate matter and infectious bacterial light virus which may cause problems in human cardiovascular and respiratory Which is very harmful to the human body.

This study was conducted to investigate the effects of surgical noxious gas generated during surgery on the operation of the US National Occupational Safety and Health Administration (NIOSH), United States Occupational Safety and Health Administration In addition to being hazardous to skin, respiratory organs and other organs, surgical fumes are not only harmful, but also cause mutations or cancers in the OSHA, the Association of Peripherally Registered Nurses (AORN), and the American National Standard Institute (ANSI) In addition, NIOSH and OSHA have presented permissible exposure limits (PEL) for surgical fumes, as they contain potentially harmful components that may affect the health of patients and health care providers.

In particular, laparoscopic surgery was performed by using a trocar to create a perforation in the abdomen of the patient, inserting an endoscope and a surgical instrument into the abdomen through a perforation, observing the surgical site through an endoscope, And the amount of use thereof is gradually increasing due to the advantage of being able to perform a precise operation without performing a surgery.

When the endoscope and the surgical instrument are inserted into the abdomen, the trocar includes a valve for discharging carbon dioxide gas. In order to secure the field of view, the valve releases carbon dioxide gas to maintain the relief.

In other words, laparoscopic surgery has the advantage of performing precise surgery without directly cutting the abdomen. However, the use of instruments such as an electric cautery device, a laser and an ultrasonic cutter is frequently used, and a generated gas And the degree of exposure of the noxious gas for operation is high due to the carbon dioxide gas flowing for maintenance of the ups and downs.

Accordingly, various studies have been carried out in order to minimize the damage caused by the harmful gas generated during the operation, in particular, during the laparoscopic surgery. As a result of this study, a method of removing the noxious gas by attaching the filter to the surgical instrument and the trocar It has been studied and widely used.

Generally, since harmful gas for surgical use contains harmful components of various various components, in order to improve the filter efficiency of the medical device filter, it is necessary to manufacture the filters corresponding to specific harmful components and then ultrasonic fuse them.

However, since a single material filter is used in the market, there is a disadvantage that the efficiency of the filter is inferior due to the limitation of the raw material used as a single material.

In order to ultrasonically bond filters formed of different nonwoven fabrics, adhesion between the nonwoven fabrics should be excellent, but conventionally, there is no separate means for enhancing the adhesion with other nonwoven fabrics. Therefore, So that the adhesion between the nonwoven fabrics is improved by continuously performing the ultrasonic welding process.

However, when the ultrasonic welding process is continuously performed, the frictional heat generated when the ultrasonic welding process deforms the original shape of the fiber and the original property of the fiber, so that the filter can not exhibit the desired filter efficiency even if the adhesion is performed.

US Patent No. 5,722,962 (Mar. 3, 1998) discloses a structure for removing harmful gases for surgical operation by attaching a filter to a trocar. However, since the filter is formed of a single material and a single layer, the pressure loss is high, The efficiency is low.

Further, since the above-mentioned filter does not disclose a separate means for enhancing the adhesion between the nonwoven fabric and the other nonwoven fabric when ultrasonic welding is performed, the adhesive property to the other nonwoven fabric is deteriorated at the time of ultrasonic welding as described above, Is continuously performed to cause a problem that the original shape of the fiber and the original properties of the fiber are deformed due to frictional heat.

In order to solve the above problems, it is an object of the present invention to provide a fibrous layer having a multi-layer structure in which fibrous layers are formed in a multi-layered structure to reduce pressure loss and increase collecting efficiency, The present invention is to provide a medical hepafilter filter material having a multi-layer structure capable of enhancing the adhesiveness and binding force with other nonwoven fabrics by containing synthetic fibers, and a method for manufacturing the same.

Another problem of the present invention is that the first fiber layer and the second fiber layer are produced by laminating the first filter slurry and the second filter slurry in a liquid phase so that the multi- Filter filter material and a method for producing the same.

Another object of the present invention is to provide a method for producing a filter slurry, which comprises adding a first filter slurry and a second filter slurry to a first filter slurry and a second filter slurry, wherein the first filter slurry and the second filter slurry have a headbox concentration of 0.03 to 0.06 mass% To 1.00 mass%, respectively, so that ultrasonic welding can be performed with optimum pressure loss and collection efficiency through deformation of the head box density of each filter slurry, and a method for producing the same.

Another object of the present invention is to provide a multi-layer structure capable of suppressing deformation of fibers due to moisture penetration by adding 1 to 5 wt% of a water repellent to at least one of the first filter slurry and the second filter slurry And a method for producing the same.

According to an aspect of the present invention, there is provided a hap filter comprising a first fiber layer and a second fiber layer laminated in a liquid phase, Wherein 65 to 80% by weight of long fibers, which are glass fibers having a diameter of 1.0 to 10.0 μm, 15 to 30% by weight of synthetic fibers having a diameter of 2 denier / 12 mm, and 1 to 5% by weight of a binder are mixed, A first filter slurry producing step of producing a first filter slurry having a headbox concentration of 0.03 to 0.06 mass% forming a first fibrous layer; 55 to 80% by weight of ultrafine staple fibers having a diameter of 0.01 to 1.00 μm, 15 to 40% by weight of long fibers having a diameter of 1.0 to 10.0 μm and 1 to 5% by weight of a binder are mixed and stirred with water, A second filter slurry production step of producing a second filter slurry having a headbox concentration of 0.05 to 1.00 mass% forming a 2-fiber layer; A liquid phase laminating step of laminating the first filter slurry produced by the first filter slurry producing step and the second filter slurry produced by the second filter slurry producing step in a liquid phase; A moisture removing step of sucking moisture of the filter media stacked by the liquid phase laminating step; A pressurizing step of pressurizing the filter media having passed through the water removal step; And a drying step of removing residual moisture of the filter media having passed through the pressing step, wherein the first filter slurry preparation step comprises the steps of: preparing a slurry containing 65 to 80% by weight of long fibers, glass fibers having a diameter of 1.0 to 10.0 μm, And a binder (35) in an amount of 1 to 5% by weight based on the total weight of the first filter composition and the second filter composition, And adding the additive to a pulper to produce a dispersion; and a step of preparing a dispersion by adding 1.5 to 2.5% by weight of the first filter composition prepared by the first filter composition production step Wherein the second filter slurry is prepared by mixing 55 to 80% by weight of ultrafine staple fiber, which is a glass fiber having a diameter of 0.01 to 1.00 μm, 15 to 40% by weight of long fibers having a diameter of 1.0 to 10.0 탆, And 1 to 5% by weight of a binder, 1.5 to 2.5% by weight of the second filter composition prepared by the second filter composition production step is added to the dispersion 97.5 To 98.5% by weight of water to produce the second filter slurry.

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In another aspect, the present invention provides a hepafilter filter medium for enhancing adhesion of a fibrous layer to be ultrasonically fused after contact with other nonwoven fabrics, comprising: 65 to 80% by weight of long fibers of glass fibers having a diameter of 1.0 to 10.0 탆, A first fiber layer formed of a first filter slurry having a headbox concentration of 0.05 to 1.00 mass% mixed with water after mixing 15 to 30 weight% of 2 denier / 12 mm of synthetic fiber and 1 to 5 weight% of binder; 55 to 80% by weight of ultrafine staple fibers having a diameter of 0.01 to 1.00 탆, 15 to 40% by weight of long fibers having a diameter of 1.0 to 10.0 탆 and 1 to 5% by weight of a binder, And a second filter layer formed of a second filter slurry having a concentration of 0.03 to 0.06 mass%, wherein the first fiber layer and the second fiber layer are laminated in a liquid phase, and the first filter slurry is a fiberglass having a diameter of 1.0 to 10.0 m A first filter composition comprising 1.5 to 2.5% by weight of a first filter composition comprising 65 to 80% by weight of a core fiber, 15 to 30% by weight of a synthetic fiber having a diameter of 2 denier / 12 mm and 1 to 5% (Hydrochloric acid) or a dispersing agent at a concentration of 4 to 4%, and then adding the additive to a pulper. The second filter slurry is prepared by mixing glass fibers having a diameter of 0.01 to 1.00 탆 55 to 80% by weight of the ultrafine staple fibers, 15 to 40% by weight of the long fibers having a diameter of 1.0 to 10.0 탆, And 1.5 to 2.5% by weight of the second composition by mixing the filter%, will be prepared by stirring the dispersion liquid 97.5 ~ 98.5% by weight.

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According to the present invention having the above-mentioned solution, a plurality of fibrous layers are laminated to form a multi-layer structure, so that the pressure loss can be reduced and the collection efficiency can be remarkably increased in comparison with the filter material having a single-layer structure.

In addition, according to the present invention, in order to solve the problem that when the first fiber layer that is ultrasonically fused to the other nonwoven fabric after the manufacture is composed only of glass fiber, the adhesion is poor and the binding with the other nonwoven fabric is not performed, The adhesion with other nonwoven fabrics can be remarkably increased upon ultrasonic welding.

Further, according to the present invention, since the first filter slurry and the second filter slurry forming the first fiber layer and the second fiber layer are laminated in a liquid phase, they have an excellent interlaminar bond force without any other means such as needle punching or thermal fusing, It is possible to improve the damage and deformation of the fiber prototype due to the presence of the fiber.

According to the present invention, since the first filter slurry is laminated at a headbox density of 0.03 to 0.06 mass% and the second filter slurry is laminated at a headbox density of 0.05 to 1.00 mass%, the first fiber layer functions as a balun layer, And the second fiber layer functions as a dense layer to further enhance the filter efficiency.

According to the present invention, a water repellent agent may be added to at least one of the first filter composition and the second filter composition to reduce deformation and breakage of the fibers due to moisture penetration.

1 is a block diagram showing a hepafar filter medium according to an embodiment of the present invention.
Fig. 2 is a structural view for explaining ingredients contained in the hepafilter filter medium of Fig. 1; Fig.
3 is a flow chart showing the first filter slurry production step.
4 is a process diagram showing a second filter slurry production step.
FIG. 5 is a process diagram showing a manufacturing process of a hepafilter filter medium according to an embodiment of the present invention.
Fig. 6 is a side view showing a filter fiber laminating apparatus applied to the liquid phase laminating step of Fig. 5; Fig.
FIG. 7 is a perspective view of FIG. 6 except for the roof plate.

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

FIG. 1 is a block diagram showing a hepafar filter medium according to an embodiment of the present invention, and FIG. 2 is a diagram for describing ingredients contained in the hepafar filter medium of FIG.

1 and 2, the filter slurries having different fiber components and head box density are stacked in a liquid phase, and then dehydrated and dried to form two layers of the first fiber layer 3 and the second fiber layer 5 By forming the structure, not only the interlayer coupling force but also the pressure loss is reduced and the collection efficiency is increased without any separate binding means. At this time, since the first fiber layer 3 is a region to be adhered to the other nonwoven fabric during the ultrasonic welding, the first filter slurry forming the first fiber layer 3 may include synthetic fibers to increase adhesion and binding force with other nonwoven fabric.

Although the hepafilter filter medium 1 has been described as having a two-layer structure for the sake of convenience of explanation, the layer structure of the hepafilter filter medium 1 is not limited to this, Layer structure.

The first fiber layer 3 comprises 65 to 80% by weight of glass fibers (hereinafter referred to as long fibers) 31 having a diameter of 1.0 to 10.0 μm, 15 to 30% by weight of synthetic fibers 33 having a diameter of 2 denier / 12 mm, The first filter slurry 30 having been agitated in an amount of 1.5 to 2.5% by weight and the water (80) in an amount of 97.5 to 98.5% by weight is mixed with 1 to 5% by weight of the mixture (35).

The second fiber layer 5 comprises 55 to 80% by weight of glass fibers (hereinafter referred to as ultrafine staple fibers) 51 having a diameter of 1.0 to 10.0 μm, 15 to 40% by weight of long fibers 53 having a diameter of 1.0 to 10.0 μm, The second filter slurry 50 is prepared by stirring the water (80) 97.5 to 98.5% by weight with 1.5 to 2.5% by weight of the mixture 60 obtained by mixing 1 to 5% by weight of the binder 35.

Although not shown in the drawing, the first fibrous layer 3 is formed by mixing 1 to 5% by weight of a water repellent agent known to 95 to 99% by weight of the first filter slurry 30 to reduce fiber deformation and breakage due to moisture penetration .

At this time, the first filter slurry 30 has a headbox concentration of 0.03 to 0.06 mass%, the second filter slurry 50 has a headbox concentration of 0.05 to 1.00 mass%, and the first filter slurry 30 and the 2 filter slurry 50 is carried out by the filter fiber laminating apparatus 300 of FIG. 6 to be described later.

The first filter slurry 30 is a filter slurry for forming the first fiber layer 3 and comprises 65 to 80% by weight of glass fibers (hereinafter referred to as long fibers) 31 having a diameter of 1.0 to 10.0 μm, (80) 97.5 to 98.5% by weight to 1.5 to 2.5% by weight of a mixture (40) comprising 15 to 30% by weight of a synthetic fiber (33) and 1 to 5% by weight of a binder (35) 0.03 to 0.06 mass%. At this time, the synthetic fiber 33 enhances the bonding force with the other nonwoven fabric while increasing the bonding force between the nonwoven fabric and the fiber, and if the content is less than 15% by weight, the content of the synthetic fiber is excessively decreased, And if it exceeds 30% by weight, the content of the long fibers 31 is lowered, and the desired filter efficiency can not be exhibited.

The first filter slurry 30 contains 65 to 80% by weight of glass fibers (hereinafter referred to as long fibers) 31 having a diameter of 1.0 to 10.0 μm and the content of the long fibers 31 is less than 65% If the content exceeds 80% by weight, the content of the glass fiber increases, and dehydration is not properly performed in the dehydration step, resulting in a problem that paper fills are not formed.

As described above, the hepafilter filter medium 1 according to an embodiment of the present invention can increase the adhesive force with other nonwoven fabrics by mixing the synthetic fibers with the first fibrous layer 30 which is ultrasonically fused with the other nonwoven fabric.

The second filter slurry 50 is a filter slurry for forming the second fibrous layer 5 and comprises 55 to 80% by weight of ultrafine staple fibers 51 having a diameter of 0.01 to 1.0 탆 or less, (80) 97.5 to 98.5% by weight of a mixture 60 of 15 to 40% by weight of a binder 35 and 1 to 5% by weight of a binder 35, 0.05 to 1.00 mass% % ≪ / RTI > headbox density.

The ultrafine staple fiber 51 may be one of borosilicate glass, C glass with acid resistance, E glass (non-alkali glass) with electrical insulation, low boron glass and silica glass, or any mixture of at least two of them As shown in Fig.

If the content of the ultrafine staple fibers 51 is less than 55% by weight, the content of the staple fibers is lowered and the desired filter efficiency can not be expected. When the content of the ultrafine staple fibers is more than 80% by weight, the fibers are broken when the dust is desorbed, There is a problem that the paper is not formed because the dehydration is not properly performed.

Although not shown in the drawing, the second fibrous layer 3 is formed by mixing 1 to 5% by weight of a water repellent agent known to 95 to 99% by weight of the first filter slurry 30, thereby reducing fiber deformation and breakage due to moisture penetration .

The first filter slurry 30 and the second filter slurry 50 thus produced are laminated in a liquid phase by the filter fiber laminating apparatus 300 of FIG. 6 to be described later to be formed into a multilayer structure, thereby reducing the pressure loss 15 to 30% by weight of the first filter slurry 30 forming the first fibrous layer 30, which is capable of increasing the collecting efficiency, increasing the interlayer coupling force without any additional binding means, and contacting the other nonwoven fabric to perform ultrasonic welding, It is possible to increase the adhesiveness with the other nonwoven fabric by containing the fibers 53.

Also, since the first filter slurry 30 and the second filter slurry 50 are laminated at a headbox concentration of 0.03 to 0.06 mass% and 0.05 to 1.00 mass% when they are laminated in a liquid phase, the second fiber layer 3 has voids A small dense layer is formed, and the first fiber layer has a larger void than the second fiber layer, so that the collecting efficiency can be further increased.

The HEPA filter medium 1 also has a suction portion 308 of the filter fiber laminating apparatus 300 of FIG. 6 to be described later when the first filter slurry 30 and the second filter slurry 50 are stacked at different headbox concentrations, And a drying unit (not shown), and is pressed by a roller to increase moldability and binding force. At this time, since the water removal process and the pressurization process are commonly used in a method of manufacturing a filter medium, detailed description thereof will be omitted.

3 is a flow chart showing the first filter slurry production step.

The first filter slurry production step (S10) comprises a first filter composition production step (S11), a dispersion production step (S12) and a stirring step (S13).

The first filter composition preparation step (S11) is a step of preparing a first filter composition composed of the long fibers 51, the synthetic fibers 53 and the binder 55. The synthetic fibers 53 have a diameter of 2 to 12 mm and a diameter of 15 to 30 wt% and the binder 55 has a diameter of 1 to 5 wt% .

The dispersion preparation step (S12) 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.

In the stirring step S13, the first filter composition produced by the first filter composition producing step S11 and the dispersion solution prepared by the dispersion producing step S12 are introduced into a pulper and stirred, And the slurry 30 is produced. The first filter slurry 30 is preferably composed of 97.5 to 98.5% by weight of the dispersion and 1.5 to 2.5% by weight of the first filter composition.

Although not shown in the drawing, the stirring step S13 further comprises a water repellent agent mixing step of mixing 1 to 5% by weight of a water repellent agent known to 95 to 99% by weight of the first filter composition, and 1.5 to 2.5 wt% % To 97.5 to 98.5% by weight of the dispersion.

Thus, the first filter slurry production step S10 is manufactured through the steps of the first filter composition production step (S11), the dispersion producing step (S12) and the stirring step (S13) as shown in Fig. 3, Is supplied to the first mixing step (S30) of FIG.

4 is a process diagram showing a second filter slurry production step.

The second filter slurry production step S20 comprises the second filter composition production step S21, the dispersion preparation step S22 and the stirring step S23.

The second filter composition preparation step S21 is a step of preparing a second filter composition composed of the ultrafine staple fibers 31, the long fibers 33 and the binder 35. The length of the ultrafine staple fibers 31 is from 0.01 to 1.0 μm and the length of the long fibers 33 is from 10 to 40% by weight and the length of the long fibers 33 is from 15 to 40% By weight.

The dispersion preparation step (S22) 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.

In the stirring step S23, the second filter composition prepared by the second filter composition preparing step S21 and the dispersion solution prepared by the dispersion producing step S22 are introduced into a pulper and stirred, Is a process step of producing the slurry (50). The second filter slurry 50 is preferably composed of 97.5 to 98.5% by weight of the dispersion and 1.5 to 2.5% by weight of the second filter composition.

Although not shown in the figure, the agitation step S23 preferably includes a water repellent agent mixing step of mixing 1 to 5 wt% of a water repellent agent known to 95 to 99 wt% of the second filter composition.

Thus, the second filter slurry producing step S20 is manufactured through the steps of the second filter composition preparing step S21, the dispersion producing step S22 and the stirring step S23 as shown in Fig. 3, Is supplied to the second mixing step (S40) of FIG.

FIG. 5 is a process diagram showing a manufacturing process of a hepafilter filter medium according to an embodiment of the present invention.

As shown in FIG. 5, the manufacturing process S1 of the HEPA filter medium includes the first filter slurry production step S10 of FIG. 3, the second filter slurry production step S20 of FIG. 4, The first filter slurry 30 produced by the slurry production step S10 is mixed with water at a headbox concentration of 0.03 to 0.06 mass% (hereinafter referred to as a first resin solution) (Hereinafter referred to as " second resin solution ") prepared by mixing the second filter slurry 50 prepared in the second filter slurry production step (S20) with water at a headbox concentration of 0.05 to 0.10 mass% The first resin solution and the second resin solution prepared by the second mixing step S40 and the first mixing step S30 and the second mixing step S40 are performed in the liquid phase laminating apparatus 300 of FIG. A liquid phase laminating step (S50) of laminating a two-layer filter media by a liquid phase laminating step (S50) (Step S70) for pressing the filter media from which water has been removed by the water removing step S60 and the water removing step S60 and a drying step S80 for removing the remaining moisture of the filter media of the two- ).

In the first mixing step S30, the first filter slurry 30 produced by the first filter slurry producing step S10 is mixed with water at a headbox concentration of 0.03 to 0.06 mass% to prepare a first resin solution . At this time, the first resin solution thus produced forms the first fiber layer 3.

In the second mixing step S40, the second filter slurry 50 produced by the second filter slurry producing step S20 is mixed with water at a headbox concentration of 0.05 to 1.00 mass% to prepare a second resin solution . At this time, the second resin solution thus produced forms the second fiber layer 5.

At this time, in the present invention, the first resin solution produced by the first mixing step (S30) and the second mixing step (S40) is such that the first filter slurry (30) has a headbox concentration of 0.03 to 0.06 mass% The solution is exemplified by mixing the second filter slurry 50 with water at a headbox concentration of 0.05 to 1.00 mass%. However, the headbox concentration of the first resin solution and the second resin solution is not limited thereto, The first fiber layer 3 formed by the first resin solution is formed to have a larger gap than the second fiber layer formed by the second resin solution and the head box density of the first filter slurry 30 and the second filter slurry 50 Can be set.

The liquid phase laminating step S50 is a step in which the first resin solution prepared by the first mixing step S30 and the second resin solution produced by the second mixing step S40 are mixed with the liquid phase laminating apparatus 300 of Fig. In a liquid phase.

The moisture removing step S60 is a process step of removing moisture of the slurry laminated in the liquid phase by the liquid phase laminating step S50 and is a step of removing moisture from the suction part 308 of the liquid phase laminator 300 of Fig. To remove moisture from the slurry. At this time, it is preferable that the suction portion 308 sucks air with a vacuum pressure of 10 to 100 cmHg.

The pressurizing step S70 is a process step for pressing the dried filter media from the water removing step S60 to increase the interlayer coupling force and to maintain the moldability of the filter media. At this time, the pressurization step S70 presses the filter media through the filter media between the rollers which are positioned adjacent but opposite to each other, not shown in the figure, and the rollers generate a pressure of 100 to 1,000 kgf / cm2.

The drying step S80 carries out a process of removing residual water remaining in the filter media subjected to the pressurization step S70.

Fig. 6 is a side view showing a filter fiber laminating apparatus applied to the liquid phase laminating step of Fig. 5, and Fig. 7 is a perspective view excluding the roof plate in Fig.

The filter fiber laminating apparatus 300 of FIGS. 6 and 7 is applied to the liquid phase laminating step S50 to form the first resin solution produced by the first mixing step S30 and the first resin solution produced by the second mixing step S40 2 resin solution in a liquid state.

In addition, the filter fiber laminating apparatus 300 includes a housing 311 having one side and an upper surface opened and having an internal space and having one side formed as an inclined surface, and a cover plate (not shown) provided on the opened upper surface of the housing 311 313 and the inner space of the housing 311 formed inside the housing 311 of the housing 301 is formed of a plate material so that the inner space of the housing 311 is divided into the first housing space 322 and the second housing space 311. [ A first inlet 321 for introducing the first resin solution and the second resin solution into the first housing space 322 and the second housing space 321 of the housing 311, The second inlet passage 304 and the second inlet passage 304 are formed at a predetermined interval in the inclined opening portion 331 of the housing 311 so that the opening 331 of the housing 311 A loop 306 in which resin solutions discharged through the loop plate 306 are stacked in a liquid phase on the upper surface, a rotation unit 307 which loops the loop plate 306, A suction unit 308 provided at a lower portion of the roof plate 306 located under the opening 331 to suck the moisture of the filter media stacked on the roof plate 306, And a storage portion 309 which is formed as an enclosure and is installed on the ground according to the path of the roof plate 306 and receives the water drained from the suction portion 308 and the roof plate 306.

In the filter fiber laminating apparatus 300 configured as described above, the inner space of the housing 311 is divided into the first housing space 322 and the second housing space 321 by the separating portion 303, The second inflow passage 304 is provided in the second accommodating space 321 formed in the upper portion of the first accommodating space 322 and the first resin solution is introduced into the second accommodating space 322 through the first inflow passage 305, The second resin solution is introduced and accommodated.

The first resin solution and the second resin solution accommodated in the first housing space 322 and the second housing space 321 are moved to the ends of the separating portion and are passed through the inclinedly formed opening 331 of the housing 311 to the roof plate 306, respectively. At this time, since the roof plate 306 is moved in the direction from the lower part to the upper part, when the first resin solution is seated on the upper surface of the roof plate 306, the second resin solution is stacked on the upper part of the second filter slurry do.

The inclined angle of the opening 331 of the housing 311 and the roof plate 306 is preferably 10 to 45 degrees. At this time, if the inclination angles of the opening 331 and the roof plate 306 are less than 10 degrees, the fiber layers are piled up in a flat state, so that the air permeability is increased beyond a desired value. If the inclination angle is more than 45 degrees, Since the filter fibers of the filter slurry solution discharged to the upper surface of the roof plate are moved downward along the roof plate in a state where they are not stacked, the laminating process is not efficiently performed.

It is preferable that the loop plate 306 is a microfine mesh of hydrophilic PET mesh 70 to 80 and is adjusted according to the height of the slurry and the thickness of the filter media. Specifically, the loop plate 306 has a speed of 10 to 100 m / min .

The moisture of the filter media stacked on the upper portion of the roof plate 306 is drained to the lower portion of the roof plate 306 through drainage grooves (not shown), while the fibers of the filter media can not pass through the drainage grooves 306, respectively. At this time, the suction portion 308 provided at the lower portion of the roof plate 306 immediately under the opening of the housing 311 sucks the moisture of the filter media formed on the roof plate 306, It is efficiently removed.

The suction portion 308 sucks the slurry deposited on the upper portion of the roof plate 306 to remove 90% or more of the moisture of the slurry, and more specifically, generates a vacuum pressure of 10 to 100 cmHg.

Hereinafter, the hepafilter filter medium according to one embodiment of the present invention will be described in more detail with reference to Examples and Comparative Examples. The following embodiments are for illustrative purposes only and do not limit the scope of protection of the present invention.

Table 1 is a table showing the components contained in Examples 1 to 3 of the present invention.

division Example 1 Example 2 Example 3 The first fibrous layer
(3) Head box concentration (% by mass) 0.05 0.05 0.05 Ultrafine staple fiber (% by weight)
(Diameter 0.5 mu m) 0 0 0 Long fiber (% by weight)
(Diameter 2.0 mu m) 67 80 75 Synthetic fiber weight% 30 17 22 diameter 2denier / 6m 2denier / 6m 2denier / 6m Binder (% by weight) 3 3 3 The second fibrous layer
(5) Head box concentration (% by mass) 0.50 0.50 0.50 Ultrafine staple fiber (% by weight)
(Diameter 0.5 mu m) 70 70 70 Long fiber (% by weight)
(Diameter 2.0 mu m) 27 27 27 Synthetic fiber weight% 0 0 0 diameter 2denier / 6mm 2denier / 6mm 2denier / 6mm Binder (% by weight) 3 3 3

Examples 1 to 3 of Table 1 are as follows.

[Example 1]

A first fiber layer formed with 67% by weight of long fibers having a diameter of 2.0 탆, 30% by weight of synthetic fibers of 2 denier / 6 mm and a headbox density of 0.05% by weight mixed with 3% by weight of a binder;

A second fiber layer formed of a headbox density of 0.50% by mass of 70% by weight of ultrafine staple fibers having a diameter of 0.5 占 퐉, 27% by weight of long fibers having a diameter of 2.0 占 퐉, and 3% by weight of a binder.

[Example 2]

A first fiber layer formed at a headbox density of 0.05% by mass of 80% by weight of long fibers having a diameter of 2.0 占 퐉, 17% by weight of synthetic fibers of 2 denier / 6 mm, and 3% by weight of a binder;

A second fiber layer formed of a headbox density of 0.50% by mass of 70% by weight of ultrafine staple fibers having a diameter of 0.5 占 퐉, 27% by weight of long fibers having a diameter of 2.0 占 퐉, and 3% by weight of a binder.

[Example 3]

A first fiber layer formed at a headbox concentration of 0.05% by mass of 75% by weight of long fibers having a diameter of 2.0 占 퐉, 22% by weight of synthetic fibers of 2 denier / 6 mm and 3% by weight of a binder;

A second fiber layer formed of a headbox density of 0.50% by mass of 70% by weight of ultrafine staple fibers having a diameter of 0.5 占 퐉, 27% by weight of long fibers having a diameter of 2.0 占 퐉, and 3% by weight of a binder.

[Experimental Example 1]

- Pressure loss test

The pressure loss was measured by using a TSI 8130 model tester. The pressure loss was measured by ventilation with a surface air velocity of 5.3 cm / sec in a filter medium having an effective area of 100 cm 2.

[Experimental Example 2]

- DOP (Dioctyl Phthalate) collection efficiency test

When the air containing DOP (phthalic acid dioctyl) having a size of 0.3 mu m was blown into a filter medium having an effective area of 100 cm < 2 > at a surface air velocity of 5.3 cm / sec, the DOP transmittance was measured with the TSI 8130 Model from upstream and downstream

[Experimental Example 3]

- Adhesion test

A 'fibers and a first fiber layer 3 at room temperature and at a tensile rate of 200 mm / min after the' pre-filter (ordinary nonwoven fabric) 'fiber of ENBIONIONE was ultrasonically fused to the first fiber layer 3 of the present invention, And tensile stress was applied thereto to measure the adhesive strength.

Table 2 shows the pressure loss, collection efficiency and adhesive strength of Examples 1 to 3 for Experimental Examples 1 to 3.

sample Pressure loss (mmAq) Collection efficiency (%) Weight (g / ㎡) Thickness (mm) Adhesion strength (Kgf / cm2) Example 1 25.9 99.951 76 0.45 13.8 Example 2 26.7 99.970 75.5 0.44 12.9 Example 3 26.2 99.988 75.5 0.45 11.5

As shown in Table 2, in Examples 1 to 3 of the present invention, the pressure loss was 25.9 mmAq, 26.7 mmAq, 26.2 mmAq, and the collection efficiencies were 99.951%, 99.970%, and 99.988%, respectively. That is, it can be seen that the hemofilter filter material 1 of the present invention has low pressure loss and high collection efficiency because the fibrous layers are formed in a two-layer structure.

In Examples 1 to 3, when the first fiber layer 3 was subjected to tensile stress after ultrasonic welding with a prefilter (ordinary nonwoven fabric) fiber of Enbiona's, the adhesive strength was 13.8 Kgf / cm 2 and 12.9 Kgf / cm 2 , And 11.5 Kgf / cm < 2 >, indicating that the adhesive strength is excellent. At this time, in Example 1, the content of synthetic fibers was larger than that in Examples 2 and 3, and the adhesive strength was the highest.

Table 3 is a table showing the components contained in Comparative Examples 1 to 6 of the present invention, and the second fiber layers of Comparative Examples 1 to 6 were configured to have the same content components as those of the second fiber layers of Examples 1 to 3.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 The first fibrous layer (3) Head box concentration (% by mass) 0.05 0.05 0.05 0.05 0.05 0.05 Ultrafine staple fiber (% by weight)
(Diameter 0.5 mu m) 0 0 0 0 0 0 Long fiber (% by weight)
(Diameter 2.0 mu m) 97 0 50 90 0 67 Synthetic fiber weight% 0 97 47 7 0 30 diameter 2denier / 6mm 2denier / 6mm 2denier / 6mm 2denier / 6mm 2denier / 6mm 2denier / 6mm Binder (% by weight) 3 3 3 3 0 3 The second fiber layer (5) Head box concentration (% by mass) 0.50 0.50 0.50 0.50 0.50 0.50 Ultrafine staple fiber (% by weight)
(Diameter 0.5 mu m) 70 70 70 70 70 70 Long fiber (% by weight)
(Diameter 2.0 mu m) 27 27 27 27 27 27 Synthetic fiber weight% 0 0 0 0 0 0 diameter 2denier / 6mm 2denier / 6mm 2denier / 6mm 2denier / 6mm 2denier / 6mm 2denier / 6mm Binder (% by weight) 3 3 3 3 3 3

Comparative Examples 1 to 6 in Table 3 are as follows.

[Comparative Example 1]

A first fiber layer formed with 97% by weight of long fibers having a diameter of 2.0 탆, 30% by weight of synthetic fibers of 2 denier / 6 mm and a headbox density of 0.05% by weight of 3% by weight of a binder;

A second fiber layer formed of a headbox density of 0.50% by mass of 70% by weight of ultrafine staple fibers having a diameter of 0.5 占 퐉, 27% by weight of long fibers having a diameter of 2.0 占 퐉, and 3% by weight of a binder.

[Comparative Example 2]

A first fiber layer formed at a headbox density of 0.05% by mass of 97% by weight of synthetic fibers of 2 denier / 6 mm and 3% by weight of binder;

A second fiber layer formed of a headbox density of 0.50% by mass of 70% by weight of ultrafine staple fibers having a diameter of 0.5 占 퐉, 27% by weight of long fibers having a diameter of 2.0 占 퐉, and 3% by weight of a binder.

[Comparative Example 3]

A first fiber layer formed at a headbox concentration of 0.05% by mass of 50% by weight of long fibers having a diameter of 2.0 탆, 47% by weight of 2 fibers / 6 mm of synthetic fibers and 3% by weight of a binder;

A second fiber layer formed of a headbox density of 0.50% by mass of 70% by weight of ultrafine staple fibers having a diameter of 0.5 占 퐉, 27% by weight of long fibers having a diameter of 2.0 占 퐉, and 3% by weight of a binder.

[Comparative Example 4]

A first fiber layer formed at a headbox density of 0.05 mass%, which is a mixture of 90% by weight of long fibers having a diameter of 2.0 占 퐉, 7% by weight of synthetic fibers of 2 denier / 6 mm and 3% by weight of a binder;

A second fiber layer formed of a headbox density of 0.50% by mass of 70% by weight of ultrafine staple fibers having a diameter of 0.5 占 퐉, 27% by weight of long fibers having a diameter of 2.0 占 퐉, and 3% by weight of a binder.

[Comparative Example 5]

Formed at a headbox density of 0.50% by mass, which is a mixture of 75% by weight of ultrafine staple fibers having a diameter of 0.5 탆, 17% by weight of long fibers with a diameter of 2.0 탆, 5% by weight of 2 eni nenier / 3 mm of synthetic fibers and 3% Wherein the fiber layer is made of a single fiber layer.

[Comparative Example 6]

A first fiber layer formed at a headbox concentration of 0.50% by mass of 67% by weight of long fibers having a diameter of 2.0 탆, 30% by weight of synthetic fibers of 2 denier / 6 mm and 3% by weight of a binder;

A second fiber layer formed of a headbox density of 0.50% by mass of 70% by weight of ultrafine staple fibers having a diameter of 0.5 占 퐉, 27% by weight of long fibers having a diameter of 2.0 占 퐉, and 3% by weight of a binder.

Thus, in Comparative Examples 1 to 4, the content of the synthetic fibers in the first fibrous layer 3 was modified. In Comparative Example 5, only one fibrous layer (the second fibrous layer) was formed. In Comparative Example 6, The concentration was modified.

Table 4 shows measured values of pressure loss, collection efficiency and tensile strength of Comparative Examples 1 to 6 for Experimental Examples 1 to 3.

sample Pressure loss (mmAq) Collection efficiency (%) Weight (g / ㎡) Thickness (mm) Adhesion strength (Kgf / cm2) Comparative Example 1 39.8 99.979 76 0.45 4.9 Comparative Example 2 28.1 97.812 75.5 0.44 16.2 Comparative Example 3 31.7 98.611 75.5 0.45 15.8 Comparative Example 4 37.4 99.965 76.1 0.45 6.4 Comparative Example 5 41.1 97.916 75.8 0.44 5.8 Comparative Example 6 36.2 98.994 75.4 0.44 10.9

As shown in Table 4, in Comparative Examples 1 to 6, the pressure loss was 39.8 mmAq, 28.1 mmAq, 31.7 mmAq, 37.4 mmAq, 41.1 mmAq, 36.2 mmAq, and the collection efficiencies were 99.979%, 99.812%, 98.611% 97.916% and 98.994%, respectively.

In Comparative Examples 1 to 6, bonding strengths were measured at 4.9 Kgf / cm2, 16.2 Kgf / cm2, 15.8 Kgf / cm2, 6.1 Kgf / cm2, 5.8 Kgf / cm2 and 10.9 Kgf / cm2.

The results of Comparative Examples 1 to 6 are shown in Table 4. In Comparative Example 1, it was found that Comparative Example 1 is composed of only long fibers without synthetic fibers, and thus has excellent collection efficiency. However, pressure loss is increased and adhesive strength is very low.

Comparative Example 2 is composed of only synthetic fibers without containing long fibers, so that the pressure loss is reduced and the bonding strength is excellent, but the collection efficiency is poor.

Comparative Example 3 is composed of 50% by weight of long fiber and 47% by weight of synthetic fiber, so that the adhesive strength is excellent as compared with Examples 1 to 3, but the pressure loss is increased and the collection efficiency is low, Lt; / RTI >

Comparative Example 4 is composed of 90% by weight of long fibers and 7% by weight of synthetic fibers, so that the collecting efficiency is maintained as it is in Examples 1 to 3, but the pressure loss is increased and the bonding strength is remarkably decreased.

In Comparative Example 5, it was found that the second fiber layer was formed in a single-layer structure, the pressure loss was remarkably increased, and the collection efficiency and adhesive strength were lowered.

Comparative Example 6 is formed with the same content as in Example 1 but laminated at a head box density of 0.50% by mass, so that the adhesive strength is maintained, but the function of the first fibrous layer as a glue layer is lost and the pressure loss is increased. Can be found.

1: hepafilter filter material 3: first fiber layer 5: second fiber layer
30: first filter slurry 50: second filter slurry

Claims (12)

A HEPA filter medium for laminating a first fiber layer and a second fiber layer in a liquid phase and for enhancing adhesion of the first fiber layer to be ultrasonically fused by contact with other nonwoven fabrics,
65 to 80% by weight of long fibers of 1.0 to 10.0 μm in diameter, 15 to 30% by weight of synthetic fibers of 2 denier / 12 mm in diameter and 1 to 5% by weight of a binder are mixed and stirred with water, 0.0 >%< / RTI > to 0.06 mass% of a headbox concentration to form a first filter slurry;
55 to 80% by weight of ultrafine staple fibers having a diameter of 0.01 to 1.00 μm, 15 to 40% by weight of long fibers having a diameter of 1.0 to 10.0 μm and 1 to 5% by weight of a binder are mixed and stirred with water, A second filter slurry production step of producing a second filter slurry having a headbox concentration of 0.05 to 1.00 mass% forming a 2-fiber layer;
A liquid phase laminating step of laminating the first filter slurry produced by the first filter slurry producing step and the second filter slurry produced by the second filter slurry producing step in a liquid phase;
A moisture removing step of sucking moisture of the filter media stacked by the liquid phase laminating step;
A pressurizing step of pressurizing the filter media having passed through the water removal step;
And a drying step of removing residual moisture of the filter media that has passed through the pressing step,
The first filter slurry preparation step may include a first filter slurry mixing 65 to 80 wt% of long fibers, 1.0 to 10.0 μm in diameter, 15 to 30 wt% of synthetic fibers, and 1 to 5 wt% of binder (35) Preparing a first filter composition for preparing a composition; adding a acid (hydrochloric acid) or a dispersant having a concentration of PH 2 to 4 to water as a dissolution liquid and adding the additive to a pulper to prepare a dispersion; , Stirring the first filter composition prepared by the first filter composition production step to a concentration of from 1.5 to 2.5% by weight of the dispersion prepared by the dispersion preparation step to 97.5 to 98.5% by weight to prepare the first filter slurry Including,
The second filter slurry preparation step may comprise mixing 55 to 80% by weight of ultra-fine staple fibers having a diameter of 0.01 to 1.00 μm, 15 to 40% by weight of long fibers having a diameter of 1.0 to 10.0 μm, and 1 to 5% A second filter composition manufacturing step of producing a second filter composition; and 1.5 to 2.5% by weight of the second filter composition prepared by the second filter composition producing step are stirred to 97.5 to 98.5% by weight of the dispersion, And a stirring step of producing a filter slurry. delete delete delete delete delete 1. A HEPA filter medium for enhancing adhesion of a fibrous layer to be ultrasonically fused by contact with other nonwoven fabric after fabrication, comprising:
65 to 80% by weight of long fibers which are glass fibers having a diameter of 1.0 to 10.0 μm, 15 to 30% by weight of synthetic fibers having a diameter of 2 denier / 12 mm and 1 to 5% by weight of binders, To 1.00 mass% of a first filter slurry;
55 to 80% by weight of ultrafine staple fibers having a diameter of 0.01 to 1.00 탆, 15 to 40% by weight of long fibers having a diameter of 1.0 to 10.0 탆 and 1 to 5% by weight of a binder, And a second fiber layer formed of a second filter slurry having a concentration of 0.03 to 0.06 mass%
Wherein the first fibrous layer and the second fibrous layer are laminated in a liquid phase,
The first filter slurry is composed of 65 to 80% by weight of long fibers as glass fibers having a diameter of 1.0 to 10.0 μm, 15 to 30% by weight of synthetic fibers having a diameter of 2 denier / 12 mm and 1 to 5% To 2.5% by weight of a dispersion liquid prepared by 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 to a pulper,
The second filter slurry is prepared by mixing 55 to 80% by weight of ultrafine staple fibers having a diameter of 0.01 to 1.00 μm, 15 to 40% by weight of long fibers having a diameter of 1.0 to 10.0 μm, and 1 to 5% 2 filter composition and 1.5 to 2.5% by weight of the dispersion, and 97.5 to 98.5% by weight of the dispersion. delete delete delete delete delete

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