JPH0985020A - Device and method for cleaning raised cloth, and raised cloth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent raised naps from being entwined with each other to greatly reduce difficulties in cleaning by providing a suction means and a means to move the suction means and a surface on raising side, along the surface on raising side in a normal direction or reverse direction with respect to raising direction. SOLUTION: When a suction means is oriented in a raising direction or in a reverse direction, i.g., a-a' direction, suction can be effected without disarranging raised naps 51. When the means is moved perpendicular to raising direction, i.g., b-b' direction, most of the raised naps 51 are pulled in the direction b-b' so that a raised layer is disarranged in such a manner that a base fabric is exposed or naps brought down 51 in the direction b-b' and naps, which are being raised to their original positions, are entwined with each other. As a result, solid particles get into weave textures or networks of base fabrics or into between entwined naps 51, and hence it becomes difficult for the suction means to conduct cleaning. Thus, relative movement of the means is directed in a normal or reverse direction, i.g., a-a' direction, to prevent the naps from being disarranged so that the raised cloth can be efficiently cleaned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a napped cloth cleaning device and method for cleaning the napped side surface of a napped cloth using a suction means, a napped cloth preferably used for these cleaning devices and methods, and , A continuous filtration method using a napped cloth as a filter medium. Standing fabric, which is used as a filter cloth for filters, which are required to be cleaned relatively often, either independently or attached to various devices, and especially as a filter cloth for a continuous filtration device. Can be preferably used for washing.

[0002]

2. Description of the Related Art There are devices and methods that utilize suction means for cleaning the napped side surface of a napped fabric. For example, JP-A-7
No. 136416, a fabric formed by forming a filter layer of naps of ultrafine fibers directly raised on a surface of a woven or knitted substrate as a filter medium (for example, for solid-liquid separation described in Japanese Patent Publication No. 62-13046). A continuous filtration device and method for sucking and removing the cake accumulated on the nap side surface by using the nap side surface of the filter cloth) as the stock solution side are described. The advantage of using a napped fabric as a filter material is that solids that are prevented from passing by the napped fabric or that adhere to the napped fabric surface are trapped mainly by the napped layer, so that they can be removed and washed relatively easily. In particular, a filter cloth having naps of ultrafine fibers has a feature that a fine napped layer is formed, so that fine solid particles can be efficiently captured and can be easily washed by suction or backwashing.

[0003]

By the way, as the demand for napped fabrics increases, the problem arises that the napped fabric surface used for filter cloth or the like that should be easy to wash becomes difficult to wash, although it is rare. It became so. The present invention has been completed with the object of clarifying the cause of a problem and providing a preferable cleaning device and a cleaning method for the surface of a napped fabric that prevents the occurrence thereof.

[0004]

In order to solve the above-mentioned problems, as a result of investigating the cause of the above-mentioned problems, a napped layer (or a substantial filtration layer when used in a filter cloth) due to some factor. (Corresponding to) is disturbed and the naps get entangled with each other,
It has been found that solid particles are entrapped in the intertwined naps and in the exposed weaves and stitches. Further, as a result of the research, the present invention provides a napped cloth cleaning device that sequentially sucks and cleans the napped side surface of a napped cloth by a suction means. The suction means, and the suction means and the napped side surface are napped. Forward or reverse in the nap direction along the side surface (a or a'in FIG. 5).
There is provided a cleaning device for a napped fabric, characterized in that it has a means for relatively moving the napped fabric.

In addition, in order to wash the napped side surface of the napped fabric used in a predetermined device by sequentially sucking the napped fabric by a suction means, the napped fabric cleaning device is attached to the device. There is provided a cleaning device for a napped cloth, comprising: a means and a means for relatively moving the suction means and the napped side surface along the napped side surface in the napped direction in a forward or reverse direction. The washing device is preferably used in a continuous filtration device in which a napped cloth is used as a filter cloth and the napped side surface is attached to the stock solution side. Since the suction means and the napped side surface of the napped fabric relatively move in the nap direction in the forward or reverse direction, they can be moved in different directions.

A napped cloth for washing is formed by joining a plurality of napped cloths (41a to 41c in FIG. 4) to a napped cloth attached to a device equipped with a cleaning device that changes its direction. The napped fabric is characterized in that the napped direction (42) is formed substantially in the forward or reverse direction with respect to the relative movement direction (44) of the suction means. Further, as a napped fabric which is specifically used, a casing (11) having a cylindrical body portion is divided into a stock solution chamber (13) and a filtrate chamber (14) at right angles to the cylindrical axis direction. Disc-shaped filter medium (12) of napped cloth, and rod-shaped suction means (1) that faces the surface of the filter medium on the side of the stock solution chamber and that rotates around the center of the filter medium and faces the surface of the filter medium.
A napped fabric to be attached to a continuous filtration device comprising a napped fabric cleaning device having 5), wherein at least three napped fabrics are joined so that the napped direction of the napped fabric at the time of washing is rotational by the suction means. Provided is a napped fabric characterized by being formed substantially in the forward or reverse direction with respect to the moving direction. INDUSTRIAL APPLICABILITY The present invention can be effectively used even when the napped cloth has a napped layer of ultrafine fibers obtained by directly raising the base cloth.

A method for cleaning the napped side surface of the napped fabric attached to a predetermined device, wherein the device is provided with a suction means that sequentially moves relatively along the napped side surface. The method for cleaning a napped cloth is characterized in that the napped cloth and the suction means are moved in a forward or reverse direction in the napping direction, and the suction means removes solid matter attached or accumulated on the napped side surface by suction. provide.

In a specific use of the present invention, a napped hair is formed in a casing (11) having a cylindrical body, and the casing is divided into a stock solution chamber (13) and a filtrate chamber (14) at right angles to the cylindrical axis direction. In a continuous filtration device provided with a cloth disk-shaped filter medium (12), facing the surface of the filter medium toward the stock solution chamber side, and
A cleaning device for a napped fabric having a rod-shaped suction means (15) that rotates and moves around the center of the filter medium facing the surface of the filter medium is provided, and the napped direction of the filter medium is substantially the direction of rotation of the suction means. To be arranged in the forward or reverse direction,
At least three napped cloths are joined, the nap side surface is used as the stock solution side, and the stock solution is sent from the stock solution chamber side through the filter medium to the filtrate chamber, and the cake that is solid-liquid separated and forms on the nap side surface is sucked. By means of suction removal by means,
A continuous filtration method using a napped fabric can be mentioned.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described with reference to the drawings. The napped fabric is usually produced by using a woven fabric as a base fabric and implanting short fibers with an adhesive, or by mechanically napping with a needle cloth or emery. According to the manufacturing method, a napped fabric having directionality along the napped surface and a random napped fabric having no directionality are obtained. These are properly used depending on the application, but, for example, a napped cloth having directionality is usually used as a filter cloth (filter) for solid-liquid separation or gas-liquid separation. FIG. 5 is an enlarged schematic view of the surface of a napped fabric having directionality, and the arrow a'direction and the a direction are the forward and reverse directions in the napped direction along the napped side surface, respectively. is there.

The suction means which is often used for cleaning the napped side surface mainly utilizes the pressure difference of gas or liquid. For example, suction ports and slits are arranged in a strip shape, and the napped side surface is arranged along the napped side surface. And move relatively sequentially. That is, either the suction means or the nap side surface or both may be moved. In the present invention, the suction means when discussing the movement means a suction portion such as a suction port or a suction slit, and does not always include a driving portion for suction, a pipe, and the like.

When a gas or liquid containing solid particles is passed through the napped surface of the napped fabric, the solid particles cannot pass through the napped layer and are trapped, and the napped layer serves as a substantial filtration layer. Act to separate solid particles. Since the separated solid particles are trapped by free naps at one end, they are not firmly trapped but easily separated and washed by suction means or backwashing. As a result of investigating the cause of the problem occurrence, the present inventors have found that the napped layer is disturbed by some factor, and the napped fibers are intertwined with each other, resulting in solid particles getting into the entanglement, or a fabric base. It was judged that this was due to the fact that the fabric of the fabric to be exposed was exposed and solid particles entered the textures and stitches and could not be removed by suction washing or the like. In addition, some of the solid particles that have passed through the napped layer through the gap generated by the napped layer being disturbed leak from the texture or stitch of the napped fabric material having a coarse mesh, which reduces the filtration efficiency.

A major factor that disturbs the napped layer is the suction means. This will be described with reference to FIG. 5 and FIG. 6, which schematically show enlarged nap side surfaces of the nap cloth and the nap cloth in which the nap layers are disturbed. When the suction means is used for cleaning, the moving direction of the suction means is a problem. When the moving direction of the suction means is set in the forward or reverse direction (a-a 'direction) to the napping direction, the napping 51 can be sucked without disturbing as shown in FIG. −
When moved in the b ′ direction), many naps are pulled in the bb ′ direction as shown in FIG. 6 to expose the base fabric portion, and the naps and the original naps fallen in the bb ′ direction. The napped layer is disturbed because the napped hair that tries to recover in the direction of entangles with each other. As a result, the solid particles enter into the weave or stitch of the base fabric portion or between the entwined naps, and it becomes difficult to remove and wash with the suction means. Therefore, by making the relative moving direction of the suction means forward or reverse to the napped direction, the problem is solved without disturbing the napped layer.
The napped cloth can be efficiently washed.

When the napped cloth is used as a filter cloth, the size of the particles that can be separated is greatly influenced by the thickness of the napped cloth. For the purpose of microfiltration, a napped fabric having a napped layer of ultrafine fibers having a thickness of 0.1 to 10 μm is usually used by direct raising of the base cloth, but the napped layer is disturbed as the napped hair becomes thinner. easy. The present invention is particularly effective in such a case.

As an embodiment of the present invention, an example of cleaning a rectangular napped fabric 31 having a nap rising direction which is used by being attached to a predetermined device will be described with reference to FIG. The predetermined device means filter devices for gas-liquid separation or solid-liquid separation, and various devices that require these filters, and has no restrictive meaning. As the cleaning means, a suction slit 33 or a suction pipe 32 having suction ports arranged in a band and a decompression means (not shown) communicating with the suction pipe 32, for example, a vacuum pump or a monopump is used. The suction slit 33 is made to face the nap side surface closely, and the suction tube 32 is placed in the nap direction 34.
It is mounted so that it can reciprocate 35 in the nap direction along the nap side surface at a right angle with respect to. The washing is performed by operating the pressure reducing means and sequentially reciprocating the suction pipe 32 in the fluff direction over the entire area of the fluff side surface (moving direction: 35).

The form of the napped fabric attached to a predetermined device is not limited to one plane. For example, it may have a conical shape (a round shape) or a cylindrical shape. In this case, the suction tube along the generatrix is often attached with the suction portion facing the nap side surface.

Further, the moving direction and the napped direction of the suction means are not always one direction. For example, there is a device in which the napped cloth is circular and the suction means is rotated around the center of the napped cloth. In such a device, by changing the moving direction of the suction means along the napped direction or by adopting a napped cloth in which the napped direction is changed, the suction means is moved relative to the napped direction in the forward or reverse direction. Let In the former case, the suction means is reciprocally moved in one direction along the napped direction regardless of the shape of the napped fabric. The latter is a single napped cloth by joining a plurality of napped cloths so that the napped cloths in the napped cloth during cleaning are formed in a substantially forward or reverse direction with respect to the relative movement direction of the suction means. To FIG. 4 is an example of the raised fabric. In this example, three napped fabrics (41a to 41c)
Are joined together to finish a napped fabric having arrow-shaped napped directions 42, respectively. 43 is a joining line of three raised fabrics. Even if the suction means is rotated around the center of the napped fabric, the napped direction and the relative movement direction 44 of the suction means are
Substantially forward or reverse.

Next, a continuous filtration method utilizing the present invention will be described as an example with reference to FIGS. 1 and 2. FIG.
2 is a schematic cross-sectional view of FIG. 1 showing an example of an embodiment of the present invention in a continuous filtration device. In this continuous filtration device, the inside of a cylindrical casing 11 is divided into a stock solution chamber 13 and a filtrate chamber 14 by a disc-shaped filter medium 12. The stock solution chamber 13 is provided with cake suction means. That is, the suction pipe 15 provided in the diametrical direction in the vicinity of the surface of the filter medium 12 is attached to the hollow rotary shaft 17, and the suction pipe 15 communicates with the hollow portion of the rotary shaft 17 and the vacuum pump through the rotary shaft 17. Alternatively, it is connected to a mono pump or the like (not shown).

The filter material 12 is attached with the napped side surface of the napped cloth facing the undiluted solution. This napped fabric is formed by joining 3 to 6 napped fabrics so that the napped direction is along the rotation direction of the suction tube, following the napped fabric shown in FIG. For the purpose of microfiltration, a napped cloth having a napped layer of ultrafine fibers having a thickness of 0.1 to 10 μm, which is obtained by directly raising the base cloth, is usually used.

A slit-shaped suction port 16 is opened in the suction pipe 15 in the longitudinal direction so as to face a portion extending from the center to the peripheral edge of the filter medium 12. The suction ports 16 are sequentially arranged so as to face each other over the entire surface of the filter medium 12 by the rotational movement of the suction pipe 15. In this embodiment example, two suction tubes 1
Since 5 are provided at positions of 180 degrees with respect to each other, the filter medium 12 is washed twice each time the rotary shaft 17 makes one rotation. The distance between the suction port 16 and the filter medium 12 is determined by the thickness of the filter cake, etc., but the closer to the filter cake, the higher the cleaning efficiency. During operation, the suction port 16 is the filtrate chamber 14 of the filter medium.
It is kept at a pressure lower than that of. However, the present invention is not limited to this embodiment, and the suction tube 15
The number of the suction means may be one, or three or more may be attached, and the movement of the suction means is not limited to the rotational movement.

The undiluted solution supplied to the undiluted solution chamber 13 communicating from the undiluted solution supply port 18 by a pump (not shown) or the like has the solid particles filtered and separated by the filter medium 12, and the filtrate is the filter medium 1.
Filtrate outlet 1 communicating with the filtrate chamber 14 after passing through 2.
9 is sent out of the filtration device. On the other hand, the solid particles separated by filtration accumulate on the surface of the filter medium 12 on the side of the stock solution chamber 13 to form a cake. The suction port 16 sequentially strokes the entire surface of the filter medium 12 and rotates around the rotating shaft 17 at a predetermined cycle to suck the filtrate from the filtrate chamber 14. Therefore, the cake at the position facing the suction port 16 is separated from the surface of the filter medium 12 by the backflowing filtrate near the suction port 16 and sucked into the suction port 16 together with the filtrate, and the filter medium 12 is washed. The continuous filtration device of the present invention can be multi-layered and multi-staged by increasing the number of filter media.

[0021]

EXAMPLE An embodiment of the present invention in which a napped fabric having naps of ultrafine fibers is used as a filter medium of the same continuous solid-liquid filtration device as shown in FIG. 1 and washing is repeated by using a suction means. An example will be described.

The inside diameter of the casing is 1200 mm, the slit width of the suction port provided in the suction tube is 2 mm, the gap between the filter medium and the suction port is 0.5 mm, and the napped woven fabric is 0.4 μm thick. It is installed as a filter medium, and the suction pump has a discharge rate of 25 liters / min.
-652RXM-1500-N11: Iwaki (Co., Ltd.)
(Manufactured by Mitsui Chemical Co., Ltd.) was used to remove general industrial water having an average solid content concentration of 1 ppm by 40 m ³ per hour to remove solid content. To wash the filter medium, rotate the suction tube at 1 rpm and suction pressure at 400
mmHg, the internal pressure of the stock solution chamber, that is, the filtration pressure is 300 m
When it reached to mAq, it was automatically performed for 3 minutes.

In the embodiment of the present invention, the fine fiber napped woven fabric divided into four pieces is used as a filter medium, and the rotation direction of the suction tube is clockwise so that the moving direction of the suction means is in the forward direction with the napping direction. FIG. 7 shows the change over time in the filtered pressure during the heating. FIG. 8 shows the change over time in the filtration pressure when the rotation direction of the suction tube is set counterclockwise so that the movement direction of the suction means is opposite to the napped direction using the same filter medium. On the other hand, as a comparative example, FIG. 9 shows the change over time in filtration pressure when a normal ultrafine fiber napped woven fabric having a constant nap direction is mounted as a filter medium.

[0024]

INDUSTRIAL APPLICABILITY In the present invention, the napped side surface of the napped fabric used as a filter or the like is washed by the suction means in the forward or reverse direction, so that the napped layer is disturbed and napped. Do not get intertwined with each other. As a result, the difficulty of cleaning can be significantly reduced. Therefore, even when the napped cloth is used as the filter medium, the filter pressure is recovered by the cleaning for a long period of time, the cleaning interval is long, and the high cleaning efficiency and the service life of the filter medium are extended.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention in a continuous filtration device.

2 is a schematic cross-sectional view of FIG.

FIG. 3 is an explanatory view of a cleaning example of a napped fabric whose nap direction is one direction.

FIG. 4 is a napped fabric obtained by joining a plurality of napped fabrics.

FIG. 5 is an enlarged schematic view of a napped side surface of a napped fabric having directionality.

FIG. 6 is an enlarged schematic view of a napped side surface of a napped fabric in which the napped layer is disturbed.

FIG. 7 is a time-dependent change in filtration pressure when the rotation direction of the suction tube is the forward direction of the nap.

FIG. 8 is a time-dependent change in filter pressure when the direction of rotation of the suction tube is opposite to the napped direction.

FIG. 9 is a time-dependent change in filter pressure when the napped direction is one direction regardless of the rotation direction of the suction tube.

[Explanation of symbols]

11: Casing 12: Filter medium (puffed fabric) 13: Stock solution chamber 14: Filtrate chamber 15: Suction tube 1
6: Slit-shaped suction port 17: Rotating shaft 18: Stock solution supply port 19: Filtrate discharge port 31: Standing fabric 32: Suction tube 33: Suction slit 34: Standing direction 35: Moving direction 41a to c: Standing fabric 42: Standing fabric Direction 43: napped cloth joining line 44: Relative movement direction of suction means 51, 61: napped aa ': forward or reverse direction to napped direction bb': direction perpendicular to napped direction

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location D06L 1/20 B01D 29/04 510F 520Z

Claims (9)

[Claims] 1. A washing device for a napped fabric, in which the napped side surface of the napped fabric is sequentially sucked and washed by a suction means, and the suction means, and the suction means and the napped side surface are provided along the napped side surface. A cleaning device for a napped fabric, comprising means for relatively moving the napped direction in a forward or reverse direction (a or a'direction in FIG. 5). 2. A washing device for a napped fabric mounted on the device, wherein the napped side surface of a napped fabric used by being attached to a predetermined device is sequentially sucked and washed by a suction means. An apparatus for cleaning a napped cloth, comprising: a means and a means for relatively moving the suction means and the napped side surface along the napped side surface in the napped direction in a forward or reverse direction. 3. The washing device for napped fabric according to claim 2, wherein the predetermined device is a continuous filtration device in which the napped fabric used as a filter cloth is attached with the napped side surface facing the undiluted side. 4. The suction means and the napped side surface of the napped cloth move in different directions in order to move in the forward or reverse direction relative to each other, thereby moving in different directions.
The napped cloth cleaning device according to 1. 5. A napped cloth to be attached to a device equipped with the napped cloth cleaning device according to claim 4, wherein a plurality of napped cloths (41a to 41c in FIG. 4) are joined for cleaning. The raised fabric (42) of the raised fabric is formed in a substantially forward or reverse direction with respect to the relative movement direction (44) of the suction means. 6. A casing (1) in which a body is formed in a cylindrical shape.
1), the stock solution chamber (1
3) A disk-shaped filter medium (12) of a napped fabric divided into a filtrate chamber (14), and a surface of the filter medium on the side of the stock solution chamber, which is rotated about the center of the filter medium to face the surface of the filter medium. A napped fabric to be attached to a continuous filtration device comprising a napped fabric washing device having a rod-shaped suction means (15), wherein at least three napped fabrics are joined together,
A napped cloth characterized in that the napped cloth is napped in a direction that is substantially forward or reverse to the rotational movement direction of the suction means during washing. 7. The napped fabric has a napped layer of ultrafine fibers obtained by direct raising of a base fabric.
The napped cloth described. 8. A method for cleaning the napped side surface of a napped fabric attached to a predetermined device, wherein the device is provided with suction means that sequentially move relatively along the napped side surface. A method for cleaning a napped fabric, characterized in that the napped fabric and the suction means are moved in the nap direction in the forward or reverse direction, and the solid matter attached or accumulated on the nap side surface is removed by suction by the suction means. 9. A casing (11) having a cylindrical body,
Disc-shaped filter material (1) of a napped cloth that divides the inside of the casing into a stock solution chamber (13) and a filtrate chamber (14) at right angles to the cylinder axis direction.
In the continuous filtration device provided with 2), a napped cloth having a rod-shaped suction means (15) facing the surface of the filter medium on the side of the undiluted solution chamber and rotatingly moving around the center of the filter medium and facing the surface of the filter medium. The cleaning device is provided, and at least three napped cloths are joined to the filter medium so that the napped direction is arranged substantially in the forward or reverse direction with respect to the rotational movement direction of the suction means. Is used as the stock solution side, the stock solution is sent from the stock solution chamber side through the filter medium to the filtrate chamber, and the cake that is solid-liquid separated and is generated on the nap side is sucked and removed by suction means. Continuous filtration method using cloth.