JP5271229B2 - Filtration system - Google Patents

Description

  The present invention relates to a filtration system that clears dampening water containing impurities, for example, into a state suitable for printing.

  For example, in lithographic printing, printing is performed by dampening the plate surface with dampening water so that ink does not adhere to non-image areas of printing. When the printing is performed, if paper dust, which is powdery dust attached to the paper surface, adheres to the printing plate or the blanket during printing, the paper powder causes the printed part to become white spots. Therefore, it is necessary to remove impurities such as paper dust contained in the fountain solution.

  As a technique for purifying the fountain solution, there is one disclosed in Japanese Patent Application Laid-Open No. 2004-97968 (Patent Document 1). This technology accommodates multiple porous volcanic rocks in a container, and adsorbs dirt such as emulsions and fine powder in mechanical water to the pores in the porous volcanic rock while the mechanical water containing dirt reaches from the inlet to the outlet. By doing so, the fountain solution is purified.

  In the technique disclosed in Patent Document 1, the porous volcanic rock is sized so that the particle diameter of the porous volcanic rock housed in the container is 5 cm to 15 cm. And the porous volcanic rock with dirt on the hole surface can be reused by taking it out of the container and heating or washing it.

JP 2004-97968 A

  However, in Patent Document 1, since the porous volcanic rock is assumed to be reused, the size of the porous volcanic rock is 5 cm to 15 cm. Therefore, when the container is filled with the porous volcanic rock, the porous volcanic rock is Since the gap between each other is equal to or larger than the particle size of the paper powder, there is a problem that the paper powder rubs through the gap and the filtering effect cannot be sufficiently exhibited.

  It is also possible to attach paper dust to the surface of the porous volcanic rock under static pressure, but there is a gap larger than the particle size of the paper powder between the porous volcanic rocks in the container. There is a high possibility that the porous volcanic rocks will scrub through the space between the porous volcanic rocks and stay at the bottom of the container, and the filtration effect cannot be fully exhibited.

  Further, the fountain solution used for printing contains not only paper dust but also dirt such as powder, ink and oil. Since dirt such as powder, ink, and oil has a smaller particle size than the size of paper powder, it is difficult to capture these dirt with porous volcanic rock.

  Activated carbon is used as the adsorbent, but its usage is to pulverize the raw material to make fine particles, and to attach dirt to the irregular structure on the surface of the fine particles or to the communication holes formed inside. The activated carbon is used by filling a bag. In this case, the bag is filled with the activated carbon surface in contact with the foreign bag.

The present inventors have clarified the following by repeating various experiments.
That is, the present inventors
(1) When flowing sewage, activated carbon applied to the bag rubs against the bag due to fluctuations in water pressure, etc., and the abrasion powder closes the bag mesh,
(2) When the activated carbon applied to the bag is worn, it develops to friction between the activated carbon due to it, and the particle size of most of the activated carbon is reduced, and the filtration effect decreases in a short period of time.
(3) The usage of activated carbon is limited to finely pulverized form, not paying attention to the unevenness and the size of the communication hole formed on the surface of the activated carbon, and the characteristics of activated carbon are not fully exhibited. about,
(4) It was clarified that the usage of activated carbon was filtration only with the activated carbon, and it was not able to cope with dirt of different sizes.

  An object of the present invention is to provide a filtration system that can be used for a long period of time by suppressing wear of a particulate adsorbent and using micrometer-order irregularities and nm-order communicating holes and fine particles. Is to provide.

  In order to achieve the above object, a filtration system according to the present invention is a filtration system for filtering foreign substances contained in a carrier, and has fine particles having irregularities in the order of μm and communicating holes in the order of nm, and a water-repellent treatment on the surface region. The inner and outer double structure having a filter function by laminating fibers inside, and having a nonwoven fabric formed in a bag shape, and applying the surface of the fine particles to the inner wall of the nonwoven fabric subjected to water repellent treatment The fine particles are retained in a block shape with the nonwoven fabric.

  In the present invention, the nonwoven fabric has an internal / external double structure, and improves the familiarity with the fine particles in the surface region to suppress the dullness of the fine particles, and the filter function provided by the non-woven fabric and the μm provided by the fine particles. By capturing foreign matter contained in the carrier by the irregularities of the order and the communication holes of the nm order, the filtration effect can be improved and the filtration effect can be exhibited over a long period of time.

1 is a principle diagram showing a filtration system according to an embodiment of the present invention. (A) is the photograph which image | photographed the filtration system which concerns on embodiment of this invention from the front, (b) is the photograph image | photographed from the upper surface. It is the photograph which observed the diatomaceous earth as grind | pulverized based on the conventional usage with the scanning electron microscope (SEM). (A) is a photograph of fine particles (adsorbent) used in a filtration system according to an embodiment of the present invention observed with a scanning electron microscope (SEM), and (b) is a magnification of fine particles (adsorbent) of (a). And a photograph observed with a scanning electron microscope (SEM). (A) (b) is the photograph which observed the fine particle (adsorbent) used for the filtration system which concerns on embodiment of this invention with the transmission electron microscope (TEM). It is the photograph which observed the microparticles | fine-particles used for the filtration system which concerns on embodiment of this invention with the scanning electron microscope (SEM) from the cross-sectional direction. It is the photograph which observed the microparticles | fine-particles used for the filtration system which concerns on embodiment of this invention with the transmission electron microscope (TEM). (A) is the photograph which observed the bag-shaped nonwoven fabric used for the filtration system which concerns on embodiment of this invention with the scanning electron microscope (SEM), (b) is a scanning microscope with the high magnification of the bag-shaped nonwoven fabric shown to (a). It is a photograph taken by (A) is a plan view schematically showing a state in which a fine particle (adsorbent) used in a filtration system according to an embodiment of the present invention is filled with a bag-like nonwoven fabric in a nano-size state and retained in a block shape; ) Is a diagram schematically showing a cross-sectional form of fine particles (adsorbent) used in the filtration system according to the embodiment of the present invention. It is a photograph which shows the result of the experiment which filtered dampening water using the filtration system concerning the embodiment of the present invention. (A) is the photograph which shows the microparticles | fine-particles (adsorbent) before adsorption | suction processed into the unevenness | corrugation of a micrometer order used for the filtration system which concerns on embodiment of this invention, and the communicating hole of nm order, (b) is embodiment of this invention. It is a photograph which shows the microparticles | fine-particles (adsorbent) containing the foreign material (organic substance etc.) capture | acquired with the said filtration system. It is a figure which shows an example of the result of having analyzed the residue of the foreign material (organic substance, paper powder, etc.) captured by the filtration system which concerns on embodiment of this invention by EDS (energy dispersive X-ray spectroscopy).

  Hereinafter, embodiments of the present invention will be described in detail.

As shown in FIGS. 1 and 2 (a) (b), the filtration system according to the embodiment of the present invention is a filter that filters foreign matters (organic matter, paper powder, etc.) 5a, 5b, 5c, 5d contained in the carrier 3. The system has an unevenness 1b of μm order shown in FIGS. 4A and 4B and communication holes 1c and 1d of nm order shown in FIGS. 4A, 4B, 5A, and 5B. A fine particle (adsorbent) 1 and an internal / external double structure in which a surface region is subjected to water repellency treatment as shown in FIGS. a) a non-woven fabric 2 formed in a bag shape as shown in (b), and the surface 1a of the fine particles 1 is formed on the inner wall 2a of the non-woven fabric 2 subjected to water repellent treatment as enlarged in FIG. As shown in FIGS. 2 (a) and 2 (b), the non-woven fabric 2 holds the fine particles 1 in a block shape. The one in which the features.
Further, the bag-like nonwoven fabric 2 is provided with a water intake 4 of the carrier 3 as shown in FIG. In the following description, an example in which dampening water used in the printing industry is used as the carrier 3 will be described, but the carrier 3 is not limited to the dampening water.

  FIG. 1 illustrates the principle of a filtration system according to an embodiment of the present invention. In FIG. 1, in order to show the relationship between the bag-shaped nonwoven fabric 2 and the fine particles 1 used as the adsorbent, the bag-shaped nonwoven fabric 2 is illustrated as a sheet as indicated by A. In the following description, the fine particles 1 are expressed as the adsorbent 1.

  As shown in the photograph on the right side of FIG. 2 (a), in the embodiment of the present invention, the non-woven fabric 2 is formed into a bag shape, and the bag-shaped non-woven fabric 2 is filled with the fine particles 1 forming the adsorbent and adsorbed. Fine particles 1 constituting the material are held in a block shape by a bag-like nonwoven fabric 2. The photograph on the left side of FIG. 2A shows the non-woven fabric 2 after being filled with the fine particles 1 forming the adsorbent. In this state, the water inlet 4 is not attached to the bag-like nonwoven fabric 2. Next, in the embodiment of the present invention, the water intake 4 is attached to the bag-like nonwoven fabric 2 shown in FIG. In addition, the water intake 4 of the bag-shaped nonwoven fabric 2 before use is plugged with a cap 4a.

  In the embodiment of the present invention, as the adsorbent 1, for example, diatomaceous earth or activated carbon fine particles obtained by pulverizing and heat-treating are used, or a mixture thereof, but the adsorbent is not diatomaceous earth or activated carbon. It may be a thing. In the following description, an example in which diatomaceous earth or activated carbon fine particles are used alone as the adsorbent 1 will be described.

  In the embodiment of the present invention, by modifying the structure of diatomaceous earth or activated carbon, the surface 1a is finished into fine particles having a micrometer-order unevenness 1b and a nanometer-order communication hole 1c inside. As a method for modifying the structure of diatomaceous earth among the fine particles, a method of performing a heat treatment in a NOx atmosphere can be employed. In the case of activated carbon, a method of heating in an argon + 3% hydrogen gas atmosphere can be adopted as a method of modifying the internal structure. The effectiveness of these methods is demonstrated on the basis of photographs taken by scanning electron microscope and transmission electron microscope. Note that the structure of the fine particles may be modified by a method other than these.

  Next, the fine particles obtained by simply pulverizing general diatomaceous earth are compared with the fine particles having the irregularities 1b on the order of μm and the communication holes 1b on the order of nm by applying a modification treatment of the internal structure as in the embodiment of the present invention. Then, consider the difference.

  When general diatomaceous earth is simply pulverized and observed by SEM, the surface 6 is flat as shown in FIG. 3, and the communication hole 8 has a diameter on the order of μm. From this, it is apparent from the observation results using photographs taken with a scanning microscope that it is impossible to capture about 3 μm paper dust and nm order organic matter contained in the fountain solution 3.

  On the other hand, as shown in FIG. 4A, the fine particles 1 constituting the adsorbent used in the embodiment of the present invention have irregularities 1b on the order of μm on the surface 1a. Further, when SEM observation is performed with the magnification increased, it can be seen that as shown in FIG. 4 (b), a communication hole 1c of the order of nm having a hole diameter smaller than the unevenness 1b of the order of μm is formed. A protrusion 1d is formed on the inner wall of the communication hole 1c. The structure of the protrusion 1d effectively contributes to capturing organic substances (ink components, powder, fats and oils), paper powder, and the like.

  Therefore, in the embodiment of the present invention, it is possible to capture the paper powder 5a of about 3 μm contained in the fountain solution as shown in FIG. 1 by the unevenness 1b of the μm order, and the communication hole 1c of the nm order. Thus, it is understood that organic substances (powder 5b, ink component 5c, oil 5d, etc.) in the order of nm contained in the fountain solution 3 can be captured. In addition, the organic matter can be captured more effectively by the protrusion 1d on the inner wall of the communication hole 1c of the nm order.

  Furthermore, the result of observing the diatomaceous earth forming the adsorbent 1 in which the internal structure of the substance in the embodiment of the present invention is observed with a transmission electron microscope (TEM) will be described based on FIGS. 5 (a) and 5 (b). As shown in FIGS. 5 (a) and 5 (b), a black stripe contrast 7 is observed inside the fine particles 1, and the width thereof is 50 to 100 nm, which is formed as a communication hole 1c. Even in this case, the communication hole 1c is in the order of nm.

  Moreover, the result of having observed the activated carbon which makes the adsorbent 1 which modified | denatured the structure inside a substance in embodiment of this invention with the transmission electron microscope (TEM) is demonstrated. 7A, 7B, and 7C are TEM photographs of the D region shown in FIG. 6 observed with a transmission microscope. From the photographs of FIGS. 7A, 7B, and 7C, protrusions that appear to be traces of the communication holes 1c were observed. As shown in FIGS. 7A, 7B, and 7C, a projection 1d having a thickness of 10 to 100 nm is formed on the side surface of the communication hole 1c that appears flat from the SEM observation by the scanning electron microscope shown in FIG. The 1d structure contributes effectively to capture organic substances (ink components, powder, fats and oils), paper powder, and the like.

  In view of observation of fine particles using a scanning electron microscope and a transmission electron microscope as described above, in the embodiment of the present invention, the surface 1a of the fine particle 1 is formed with irregularities 1b on the order of μm, and communication in the order of nm. Since the holes 1c are formed, for example, ink components, powders, fats and oils that are organic substances contained in the fountain solution 3 are captured by the communication holes 1c of the nm order, and about 3 μm of paper dust is captured by the unevenness 1b of the order of μm. It captures and contributes to purification of the fountain solution 3.

  Furthermore, in the embodiment of the present invention, as shown in FIGS. 7A, 7B, and 7C, since the protrusion 1d of the order of nm is further formed on the inner wall of the communication hole 1c, the protrusion 1d is connected to the communication hole. This contributes to capture of the organic matter by 1c, and contributes to effective capture of the organic matter by the communication hole 1c and the protrusion 1d inside thereof.

  Furthermore, in the embodiment of the present invention, the surface region of the nonwoven fabric 2 is subjected to water repellent treatment. Specifically, in the embodiment of the present invention, for example, a product name “Adesso WR-1” manufactured by Nikka Chemical Co., Ltd. is used to perform water repellency treatment on the fibers of the non-woven fabric 2 to form a repellency formed on the surface region. The non-woven fabric 2 has an inner / outer double structure having a water layer 2c and a filter function 2d formed by stacking fibers inside. Further, the non-woven fabric 2 having the inner / outer double structure is formed in a bag shape as shown in FIGS.

  Furthermore, in the embodiment of the present invention, as shown in FIGS. 1 and 2, the inner / outer double-structured nonwoven fabric 2 is formed into a bag shape with the water-repellent layer 2c in the surface region as the inner wall of the bag. And the fine particle 1 which makes the adsorbent 1 is filled in the said bag-shaped nonwoven fabric 2, and these fine particles 1 are shape-retained by the bag-shaped nonwoven fabric 2 at the block shape.

  Furthermore, in the embodiment of the present invention, the familiarity between the fine particles 1 and the inner wall 2a of the nonwoven fabric 2 is improved by applying that the inner wall 2a of the bag-shaped nonwoven fabric 2 is a water-repellent treatment 2b. Thus, the fine particles 1 located on the block-like surface layer side and the inner wall 2a of the nonwoven fabric 2 are brought into close contact with each other.

  Next, the result of observing the nonwoven fabric 2 used in the embodiment of the present invention with a scanning electron microscope will be described.

When the non-woven fabric 2 after the water-repellent treatment is observed with an SEM, the diameter of the fibers 2d forming the nonwoven fabric 2 is about 15 to 20 μm and the fibers 2d are laminated as shown in FIG. Therefore, the filter function is considered to be substantially several μm. Further, as shown in FIG. 8B, when the fiber 2d located in the surface region of the nonwoven fabric 2 is observed, the surface of the fiber 2d is shining, and the water repellent layer 2c is present in the surface region of the nonwoven fabric 2. I understand that.
Considering the observation results by these scanning electron microscopes, it can be seen that the non-woven fabric 2 having an inner / outer double structure having a water-repellent layer 2c formed in the surface region and a filter function 2d formed by laminating fibers therein is formed. This is clear from the SEM photograph shown in FIG. 7 that the conventional nonwoven fabric has only a filter function based on fiber lamination and the nonwoven fabric 2 having an internal / external double structure used in the embodiment of the present invention. .

  The nonwoven fabric 2 used in the embodiment of the present invention captures organic matter, paper powder, and the like by inertial action, collision action, dispersion action, gravity action, electrostatic action, and the like. As can be seen from FIG. 8A, the filter function of the non-woven fabric 2 is substantially several μm, so that it can be seen that paper dust and the like can be sufficiently captured.

In addition, the nonwoven fabric 2 used in the embodiment of the present invention is provided with a water repellent treatment on the fibers 2d, particularly the fibers b2d in the surface region, and the surface region of the nonwoven fabric 2 has a water repellent layer 2c. Therefore, the familiarity between the fine particles 1 and the fine particles 1 is improved, and the fine particles 1 are applied in close contact with the inner wall 2 a of the nonwoven fabric 2.
For this reason, the dampening water 3 supplied from the water intake port 4 is suppressed from rubbing the fine particles 1 forming the adsorbent with the inner wall 2a of the nonwoven fabric 2 due to fluctuations in water pressure, and as a result, the surface of the fine particles 1 forming the adsorbent. The shape of 1a is not blunted. Therefore, the filtration effect by the fine particles 1 constituting the adsorbent is maintained for a long time.

  Next, the case where the fountain solution 3 used in the printing industry is purified using the filtration system according to the embodiment of the present invention will be described.

  When the dirty dampening water 3 is supplied from the water intake 4 of the bag-like non-woven fabric 2 to the fine particles 1 constituting the block-shaped adsorbent in the non-woven fabric 2, the dampening water 3 fed in is shown by a thick line in FIG. As shown in FIG. 1, the paper powder 5a flowing along the surface 1a of the fine particle 1 and contained in the fountain solution 3 is enlarged on the surface 1a of the fine particle 1 as shown in FIG. 4 (a) and 4 (b) are captured by the unevenness 1b on the order of μm. The fine particles 1 located on the block-shaped outer peripheral surface are in close contact with the water-repellent layer 2c of the nonwoven fabric 2 shown in FIG. 8B, and the paper powder 5a is captured by the irregularities 1b of the surface 1a.

  Further, when the fountain solution 3 flows along the surface 1a of the fine particles and penetrates inside as shown by a thick line in FIG. 9A, the foreign matter contained in the inside, specifically, the powder 5b which is an organic substance. When the ink component 5c and the oil component 5d flow through the communicating holes 1c of the order of nm shown in FIGS. 9B, 4B and 5A and 5B, which are schematically shown, It is captured in the communication hole 1c of the order. In this case, as shown in FIGS. 7A, 7B, and 7C, when the protrusion 1d is formed on the inner wall of the communication hole 1c, the organic matter is also captured by the protrusion 1d in the communication hole 1c. The

  In the embodiment of the present invention, as shown in an enlarged view in FIG. 1C, the surface 1a of the fine particles 1 is in close contact with the inner wall 2a of the non-woven fabric 2, so that the mesh 2b of the non-woven fabric 2 is blocked by the fine particles 2. However, since the water repellent layer 2c exists in the surface region of the nonwoven fabric 2, the purified dampening water 3 is separated from the surface 1a of the fine particles 1 and the inner wall 2a of the nonwoven fabric 2 by the water repellent layer 2c of the nonwoven fabric 2. And is drained to the outside of the bag-like nonwoven fabric 2.

  Further, the nonwoven fabric 2 used in the embodiment of the present invention has a water-repellent layer 2c in the surface region as shown in FIG. 8 (b), but the fibers 2d are laminated inside as shown in FIG. 8 (b). In addition to flowing along the surface 1a of the fine particles 1 shown in FIG. 9 (a), the fountain solution 3 dives between the fibers 2d of the nonwoven fabric 2 and flows. The nonwoven fabric 2 captures the filter function of the nonwoven fabric 2.

  As described above, according to the embodiment of the present invention, the fine particle 1 constituting the adsorbent 1 μm-order irregularities 1b and nm-order communicating holes 1c, the irregularities 1d formed on the inner walls of the communicating holes 1c, and the non-woven fabric 2 have nm. The foreign matter contained in the carrier 3 can be removed based on the filter function of the order.

  Next, the result of filtering the fountain solution used for lithographic printing using the filtration system according to the embodiment of the present invention will be described. This experiment was conducted by circulating dampening water 3 of a continuous water dampening device (capacity 100 liters) at a rate of 15 liters per minute for 12 months to the filtration system according to the embodiment of the present invention. This is a verification of the capture.

  The dampening water in the beaker shown on the right side of FIG. 10 is before filtration, and the dampening water in the beaker shown on the left side is filtered. As is clear from the comparison results of FIG. 10, it can be seen that the fountain solution is filtered and the transparency is increased. From this experimental result, it can be seen that the embodiment of the present invention is effective in filtering paper powder and organic matter contained in the carrier. Furthermore, in the embodiment of the present invention, the filtration effect was maintained even when the dampening water 3 of the continuous water dampening device (capacity 100 liters) was purified at 15 liters per minute for 12 months.

On the other hand, in the conventional filtration system, the dampening water is discarded every time maintenance is performed every several weeks, and after the inside of the tank storing dampening water is cleaned, it is replaced with new dampening water.
Even from this, in the filtration system according to the embodiment of the present invention, it is not necessary to replace the dampening water by exchanging only the adsorbent 1 and the nonwoven fabric 2. And from the results of the experiment, the replacement time of the adsorbent 1 and the nonwoven fabric 2 in the embodiment of the present invention can be extended to a period of several months to several years by adjusting the filling amount of the adsorbent 1. it can.

  The experimental results shown in FIG. 10 were performed while variously changing the particle size of the fine particles 1 constituting the adsorbent. According to the result, the particle size of the fine particles 1 constituting the adsorbent 1 is set in the range of 15 μm to 30 μm, and the permeation necessary for carrying the adsorbent 1 having the particle size as the nonwoven fabric inside the bag. It has been found that the use of a non-woven fabric having a gap for use can most effectively purify dirt over a long period of time. Accordingly, the gap formed between the fibers of the nonwoven fabric 2 is about 10 μm to 14 μm when 15 μm fine particles 1 are used as the adsorbent, and about 15 μm when 30 μm fine particles 1 are used as the adsorbent. The result shows that it is optimal to use a 28-micrometer thing.

  Further, the fine particles 1 forming the adsorbent processed into the irregularities of the μm order and the communicating holes of the nm order used in the filtration system according to the embodiment of the present invention, and the fine particles 1 before the adsorption are shown in FIG. The fine particles 1 constituting the adsorbent containing paper powder and organic matter later are shown in FIG.

Next, Tables 1 and 2 show the results of EDS analysis of the diatomaceous earth of the fine particles 1 constituting the adsorbent after adsorption shown in FIG. 11B in the embodiment of the present invention. The main component was SiO ₂ (silicon dioxide), but a little Al ₂ O ₃ (alumina) and the like were analyzed.

Next, organic substances (residues) captured as shown in FIGS. 11A and 11B were analyzed by the filtration system according to the embodiment of the present invention.
Tables 3 to 5 show the results of EDS analysis of the captured organic substances (residues) shown in FIGS. The main components of printing ink are said to be propylene glycol (CH ₃ CH (OH) CH ₂ OH) and citric acid (C ₆ H ₈ O ₇ ), but the detailed composition of organic substances corresponding to these is unknown. The production ratio of environmentally friendly lithographic ink is 4.3% for UV ink, 74.2% for soybean oil ink, and 0.9% for non-VOC ink. The proportion of ink component in dampening water is 79.4%. Therefore, it is considered that the ink component has an organic composition. In particular, it is mainly composed of components essential for organic synthesis such as oxygen (O), carbon (C), nitrogen (N), sulfur (S), sodium (Na), potassium (K). Further, magnesium (Mg), aluminum (Al), cobalt (Co) and the like are also included as gloss components. It became clear that some chlorine (Cl) was captured.

  FIG. 12 is an EDS spectrum of the trapped organic residue (3). From this spectrum, it became clear that quite a lot of organic substances were captured on the adsorbent 1 and the nonwoven fabric 2.

  Based on the above results, the filtration system according to the embodiment of the present invention is considered. By applying a water repellent treatment to the nonwoven fabric, the familiarity between the nonwoven fabric and the particulate adsorbent is improved, and the flow of the nonwoven fabric to the carrier is improved. By reducing the resistance, wear of the nonwoven fabric and the adsorbent can be suppressed, and the filtration effect can be exhibited over a long period of time.

  Furthermore, since a fine particle adsorbent having irregularities in the order of μm and communicating holes in the order of nm and a non-woven fabric formed into a bag shape by performing a water repellent treatment are used, for example, the size of the dampening water is dealt with. It is possible to clean the dirt reliably using either or both of the adsorbent and the nonwoven fabric.

  Furthermore, the surface of the particulate adsorbent is applied to the inner wall of the nonwoven fabric that has been subjected to a water repellent treatment, and the particulate adsorbent is retained in a block shape by the nonwoven fabric, thereby adsorbing the nonwoven fabric as described above. Friction with the material can be suppressed, and the friction phenomenon that develops in the entire fine particle adsorbent can be suppressed.

  The present invention is suitable not only for purification of dampening water for lithographic printing, but also for purifying carriers containing dirt on the order of nm, and can also be applied to purification processing in the food industry and the like, and does not use heat. It is possible to provide a filtration method that does not place a burden on the environment.

DESCRIPTION OF SYMBOLS 1 Fine particle 1b which makes adsorbent Irregularity 1c Communication hole 1d Protrusion 2 Nonwoven fabric 2a Nonwoven fabric inner wall 2c Water repellent layer

Claims (2)

A filtration system for filtering foreign matter contained in a carrier,
microparticles having irregularities on the order of μm and communicating holes on the order of nm,
A water-repellent treatment is applied to the surface region, and the inside and outside double structure has a filter function by laminating fibers inside, and has a nonwoven fabric formed in a bag shape,
A filtration system, wherein a surface of the fine particles is applied to an inner wall of the nonwoven fabric that has been subjected to a water repellent treatment, and the fine particles are retained in a block shape by the nonwoven fabric.   The filtration system according to claim 1, wherein a projection is provided on an inner wall of the communication hole.

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