JP2005177616A - Bag filter and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag filter provided with a plural number of sheets of filtering material with a simple method and at a low cost, said bag filter having excellent functions conforming to filtration purposes compared with a bag filter in which the filtering material is arranged in spiral form. <P>SOLUTION: The bag filter is formed by connecting a sheet of inner filtering material 4 constituting an inner bag filter 2 to a sheet of outer filtering material 5 constituting an outer bag filter 3. In this case, a sheet of inner bag filter 2, the lower end of which is closed, is folded back at the upper part area of the inner bag filter 2 so that the inner face 6 of the inner bag filter 2 may become the outer face 7 to cover the inner bag filter 2 from the outside, and the outer bag filter 3 is formed by closing the lower end of the filter thus folded back. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bag filter and a manufacturing method thereof, and more particularly, to a bag filter including a plurality of filter materials and a bag filter manufacturing method.

Conventionally, there is a technique disclosed in Patent Document 1 as a filter device in which a cylindrical filter material (filter material) is arranged to filter and separate substances and components from a fluid such as gas or liquid.
As shown in FIG. 12, this Patent Document 1 is provided with a bug filter 40, a bag filter deformation prevention cage 41 provided inside the bag filter 40, and the bag filter deformation prevention cage 41. And a plate-like catalyst (for example, a denitration catalyst) 42. The plate-shaped catalyst 42 is formed inside the bag filter 40 after being formed into a spirally wound state.
The plate-like catalyst 42 is obtained by coating a catalyst base having a certain degree of rigidity with a slurry containing a predetermined denitration active component so that the stitches or laths of the catalyst base are not blocked.

  Even when a plurality of filter materials for filtering liquid or the like are accommodated in a bag filter (not shown) whose lower portion is closed, a spiral filter material is arranged in the bag filter as shown in FIG. Is often adopted.

JP-A-11-19477 “Exhaust Gas Purification Device and Exhaust Gas Purification Method Using the Same”

However, the above conventional techniques have the following problems.
(A) In the said structure which has a spiral filter material, the manufacturing process for attaching filter attachment tools, such as an O-ring and a support frame, to the upper part of a filter material becomes complicated.
(B) In the configuration in which the filter material is simply arranged in the bag filter in a spiral shape, from the inside of the bag filter, the first filter material, the second filter material,... It is difficult to arrange a plurality of different filter materials in order toward the outside, and it is difficult to construct a highly functional bag filter that meets the purpose of filtration.

(C) In general, a back filter having a spiral filter material is difficult to wash the filter material.
(E) In particular, in the case of a bag filter in which the filter fixture is attached to a back filter having a spiral filter material, it is extremely difficult to perform cleaning after filtration. This is because it is difficult to perform cleaning by stirring in a state where the filter attachment is still attached to the filter material. In addition, there is a possibility that the filter fixture may be deformed or damaged by washing.

This invention is made | formed in view of the said subject, and the objective of this invention is providing the bag filter and the bag filter manufacturing method which can solve the said subject.
An example of a specific purpose is as follows.
(A) Even if it is a bag filter which provided the filter attachment tool in the upper part of the filter material, it makes it possible to simplify the manufacturing process.
(B) In the case where a plurality of filter materials are provided, a highly functional bag filter that matches the purpose of filtration can be provided easily and inexpensively as compared with a configuration in which the filter materials are arranged in a spiral shape.
(C) Provided is a bag filter that can be easily and satisfactorily washed even with a bag filter provided with a plurality of filter materials.
(D) Even if it is a bag filter provided with a filter attachment, it can wash | clean well and it can prevent that a filter attachment changes or breaks at the time of washing | cleaning.
The problems of the invention other than those described above and the means for solving them will be described in detail in the description in the specification to be described later.

The present invention can be expressed not only from the invention of the filter as a filter and the invention of the filter manufacturing method, but also from many aspects. For example, typical ones are configured as follows.
A bag filter according to a first aspect of the present invention is a two-sheet bag filter configured so that an outer bag filter covers an outer side of an inner bag filter, and an upper region of one inner filter bag whose lower end is closed. The inner surface of the filter is folded to cover the inner bag filter from the outside, and the outer bag filter is formed by closing the lower end of the folded filter.

According to a second aspect of the present invention, there is provided at least two bag filters configured so that the outer bag filter covers the outer side of the inner bag filter, the inner filter material made of at least one sheet constituting the inner bag filter, and the outer bag. It is constructed by connecting the outer filter material made of at least one filter constituting the filter,
The inner surface of the inner bag filter is an outer surface in the upper region of at least one inner bag filter whose lower end is closed, and is folded back so as to cover the inner bag filter from the outside. The lower end of the folded filter An outer bag filter is formed by closing.

A third invention is characterized in that, in the invention according to any one of the first invention and the second invention, at least one of the inner filter material and the outer filter material has different characteristics in terms of filter characteristics. .
A fourth invention is characterized in that, in the invention according to any one of the first to third inventions, the filter of the outer bag filter is denser in terms of filtration than the inner bag filter.

A fifth invention is characterized in that, in the invention according to any one of the first to fourth inventions, a filter mounting tool is located near the folding position.
A sixth invention is characterized in that in the invention according to any one of the first to fifth inventions, at least one of the inner bag filter and the outer bag filter is provided with an openable / closable means.

A seventh invention is characterized in that, in the invention described in the sixth invention, the openable / closable means is provided only in the inner bag filter.
An eighth invention is characterized in that, in the invention according to any one of the fifth to seventh inventions, the filter fixture is detachably fixed from the filter back surface.

  According to a ninth invention, in the invention according to any one of the second to eighth inventions, a filter end annular piece is formed at a joining position of the inner filter material and the outer filter material, and the filter end portion An annular piece is used as a support means for the filter fixture.

A tenth invention is the invention according to any one of the first to ninth inventions, wherein the bag filter bottom region is cut into a predetermined shape, and the one-side engaging portion of the openable / closable means is formed at the peripheral portion of the predetermined shape. And an abutment part having the other engagement part of the openable / closable means fixed to the peripheral part so as to correspond to the one side engagement part with the same filter material as the bag filter material. The contact part is detachably attached to the bottom area of the filter back by engaging the side engaging part and the other side engaging part.
An eleventh invention is characterized in that, in the invention according to any one of the first to tenth inventions, the periphery of the filter fixture is covered with only one filter material.

  A back filter manufacturing method according to a twelfth aspect of the present invention includes a back filter base material creating step for creating an elongated cylindrical back filter base material that is expected to be folded, and a bag filter base on the other end side of the inner surface of the bag filter base material on one end side. A folding step of folding back so as to cover the outer surface of the material, one end side bottoming step for closing one end side of the bag filter base material, and the other end for closing the other end side of the bag filter base material A two-sided bag filter is formed so that the outer back filter covers the outside of the inner bag filter.

  According to a thirteenth aspect of the present invention, there is provided a back filter manufacturing method for connecting a plurality of filter materials having different filter functions to form a long and narrow cylindrical back filter base material that is expected to be folded, and a bag on one end side. In the state where the inner surface of the filter base material is folded to correspond to the joining of the different filter materials so as to cover the outer surface of the bag filter base material on the other end side, and the one end side of the bag filter base material is closed. One end side closing step, and one end side closing step for closing the other end side of the bag filter base material, so that at least the outer back filter of different filter functions covers the outside of the inner bag filter A bag filter having a two-sheet structure is produced.

A fourteenth aspect of the invention is characterized in that, in the invention according to any one of the twelfth and thirteenth aspects of the invention, the method further includes a step of positioning a filter fixture near the turn-back position.
A fifteenth invention is characterized in that in the invention according to any one of the twelfth to fourteenth inventions, it further comprises a step of providing openable / closable means on at least one of the inner bag filter and the outer bag filter.

  A sixteenth invention is characterized in that in the invention according to any one of the twelfth to fifteenth inventions, the method further comprises a step of detachably fixing the filter attachment from the filter back surface.

Hereafter, each structure of the said 1st invention-16th invention is demonstrated.
In the 1st invention and the 2nd invention, the “state where the lower end is closed” means not only the case where the lower end is closed by a heat seal or the like, but is substantially bound by a string or folded back at the bottom area. The case where it is closed so that it can function as a filter material is included.
In the first invention and the second invention, “one sheet” means a case where it can be regarded as one sheet in handling of folding, and a single filter material has a multi-layer structure by a paper making process or a bonding process performed in advance. In this case, the concept is included in “one sheet”.

In the first invention, it is assumed that the inner back filter and the outer back filter are made by using one filter material, but the properties and functions of the inner bag filter and the outer back filter are different. Is not excluded. For example, the filter characteristics of a part of the filter material that becomes the outer back filter can be made different from the filter specification of the part that becomes the inner back filter by post-processing.
In the first invention, the shape of the bag filter is generally cylindrical, but it does not exclude other shapes.

In the second invention, the “at least two-sheet configuration” means that the filter material is two or more in the handling of folding, and includes the case where each sheet has a plurality of layers as described above. .
The number of inner back filters and the number of outer bag filters may be different.
In the third aspect of the present invention, “different characteristics in terms of filter characteristics” includes differences in the density of the filtration eyes, filter materials, substances that can be filtered and separated, components, and the like.

In the fourth invention, when the bag filter is made of two or more filter materials, it is preferable that the filtration eyes of the filter material on the outermost surface be configured most closely.
In the fifth aspect of the invention, the “filter attachment” refers to a member for attaching the bag filter to the base of the filter device, and is used as a concept including an O-ring, a support frame, and the like.
In general, the filter attachment is generally configured in a cylindrical shape such as a circle or a rectangle.

In the sixth invention, the “openable / closable means” includes a detachable engagement member such as a magic tape (registered trademark) in which a male engagement portion and a female engagement portion are arranged in a plane, a zipper, and the like. Can be illustrated.
The opening / closing means is generally provided in the bottom region of the bag filter, but does not exclude the configuration provided on the side surface of the bag filter so as to extend in the vertical direction.

In the eighth invention, as a structure for detachably fixing the filter attachment, a structure using a magic tape can be adopted in addition to the structure described in the ninth invention.
In the twelfth and thirteenth inventions, if the back filter base material creation step, the folding step, the one end side bottoming step, and the other end side bottom closing step can produce a plurality of back filters, each step can be performed over time. It may be performed in any order.
Further, as will be described with reference to FIGS. 10 and 11, the back filter base material creation step, the one end side closing step and / or the other end side closing step can be performed at once.

The effects of each invention will be described below.
In the case of the first invention, when the outer back filter is disposed outside the inner bag filter, the outer back filter is configured by folding the upper region of the inner back filter, so the two-sheet bag filter can be simplified. And it can be manufactured at low cost.
In the case of the second invention, when the outer back filter is disposed outside the inner bag filter, the outer back filter is configured by folding back the upper region of the inner back filter having at least one sheet. The bag filter having the configuration can be easily and inexpensively manufactured.

In the third invention, since at least one of the inner filter material and the outer filter material has different characteristics in terms of filter characteristics, the filter function is used for the purpose of filtration in the inner bag filter and the outer back filter. Therefore, it is possible to configure a high-performance back filter.
If it is the 4th invention, since the filter of an outside bag filter is denser in the eyes of filtration rather than an inside bag filter, clogging can be controlled and filtration performance can be improved.

According to the fifth aspect of the invention, since the filter attachment tool is positioned near the folding position, the bag filter can be easily supported and attached to the base of the filter device.
According to the sixth aspect of the present invention, since the openable / closable means is provided in at least one of the inner bag filter and the outer bag filter, it is possible to open the openable / closable state by opening the openable / closable means. The bag filter can be easily disassembled and cleaned as compared with a bag filter having no structure. Further, by opening the openable / closable means, it is possible to easily remove the filtered substance accumulated in the bottom area of the filter bag.

According to the seventh aspect of the invention, since the openable / closable means is provided only in the inner bag filter, it is possible to easily remove the filtered substance or the like accumulated in the bottom region of the inner bag filter.
According to the eighth aspect of the invention, since the filter fixture is detachably fixed from the filter back surface, the filter fixture can be removed from the filter material when the bag filter is washed and used again. When cleaning, the filter material is easy to clean, and there is no risk of the filter mounting member being deformed or damaged by cleaning.
In addition, since the filter fixture can be removed even if it is not washed, the filter fixture can be recovered and reused as needed, and the filtered material can be removed and the filter material can be efficiently disposed of. There is.

  According to the ninth aspect of the invention, the filter end annular piece is formed at the joining position of the inner filter material and the outer filter material, and the filter end annular piece is used as a support means for the filter fixture. The filter end annular piece, which is likely to occur when the inner bag filter material and the outer back filter material are joined together by a seal or the like, can be positively used as a support means for the filter attachment. Can be configured.

According to the tenth invention, since the peripheral edges are engaged with each other, the force in the pulling direction acting on the peripheral edge due to the fluid being filtered when the fluid is flowed into the back filter. In the unlikely event that a large pressure is applied, the detachment of the contact portion during use of the bag filter can be suppressed.
If it is the 11th invention, the sealing performance of the filter fixture and the base of the filter device can be improved.

According to the twelfth aspect, since the folding step is provided, a highly functional two-sheet bag filter that matches the purpose of filtration can be manufactured at a lower cost than the configuration in which the filter layers are arranged in a spiral shape.
According to the thirteenth aspect, since the folding step is provided, it is possible to manufacture a bag filter having at least two sheets having a high function that matches the purpose of filtration as compared with the structure in which the filter layers are spirally arranged.

  According to the fourteenth aspect, the filter attachment can be positioned near the folding position, so that the bag filter can be easily supported and attached to the base of the filter device. Further, the manufacturing process can be simplified as compared with the configuration in which the filter material is arranged in a spiral shape.

  According to the fifteenth aspect, the bag filter can be easily disassembled and cleaned as compared with a bag filter having no opening / closing means. Further, by opening the openable / closable means, it is possible to easily remove the filtered substance accumulated in the bottom area of the filter bag.

  According to the sixteenth aspect, it is easy to clean the filter material when cleaning, and there is no possibility that the filter fixture is deformed or damaged by cleaning. In addition, since the filter fixture can be removed even if it is not washed, the filter fixture can be recovered and reused as needed, and the filtered material can be removed and the filter material can be efficiently disposed of. There is.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view for explaining a two-sheet bag filter according to the first embodiment. FIG. 1 (A) is a front view of the bag filter, FIG. 1 (B) is a plan view thereof, and FIG. ) Is a longitudinal sectional view thereof.
The bag filter 1 is a two-sheet bag filter configured such that the outer bag filter 3 covers the outer side of the inner bag filter 2. The inner filter material 4 made of one sheet constituting the inner bag filter 2 and the outer filter material 5 made of one sheet constituting the outer bag filter 3 are joined together at a joining position 21. The inner surface 6 of the inner bag filter 2 becomes the outer surface 7 in the upper region of the one inner bag filter 2 whose lower end is closed, and is folded back so as to cover the inner bag filter 2 from the outside. The outer bag filter 3 is formed by closing the lower end of the filter.

The lower end of the cylindrical inner bag filter 2 and the lower end of the cylindrical outer bag filter 3 are each cut into a triangle shape, and each lower end is closed by a method such as heat sealing to form a bag. It is configured.
In this embodiment, the joining of the inner filter material 4 and the outer filter material 5 and the formation of joint portions (not shown) that respectively make the inner filter material 4 and the outer filter material 5 cylindrical are also performed by heat sealing. ing.
Further, an O-ring 10 as the filter attachment 9 is provided near the joining position 21, and the outer bag filter 3 is configured so as to enclose the O-ring 10 and cover the inner bag filter 2 from the outside. .

Further, as described in the ninth invention, the filter end annular piece 11 of the inner filter material 4 is formed at the joining position 21 between the inner filter material 4 and the outer filter material 5, and the filter end annular piece is formed. 11 is used as a support means for the O-ring 10. Since the filter end annular piece 11 simply supports the O-ring 10, the O-ring 10 can be easily detached from the inner filter material 4 and the outer filter material 5 when the bag filter 1 is disassembled.
When the bag filter 1 is used, it is fixed by attaching an O-ring 10 to a base body of a filter device (not shown), and a fluid is caused to flow into the bag filter 1 from the circular opening 12, so that the inner bag filter 2 and the outer bag filter 3. This is done by passing In general, the coarseness of the filter of the outer filter material 5 is made denser than the coarseness of the filter of the inner filter material 4. Further, by changing the functions of the inner filter material 4 and the outer filter material 5, it is possible to achieve filtration more suited to the purpose. For example, the inner filter material 4 is made of a material suitable for the filtration of a certain substance contained in the liquid, and the outer filter material 5 is made of a material suitable for the filtration of another substance contained in the liquid.

(Second Embodiment)
FIG. 2 is a longitudinal sectional view of the bag filter according to the second embodiment.
In the second embodiment, the inner filter material 4 and the outer filter material 5 of the first embodiment are configured by the same filter material 13, and no connection is necessary. The inner bag filter 2 and the outer bag filter 3 are the same filter material 13 and the two-pack bag filter 1 is formed. In the case of this bag filter 1, the filter material is doubled as compared with the case of a single filter material, so that the reliability of filtration can be improved when the same filtration function is realized.
In this configuration, since there is no connection, a fixing member 22 for fixing the filter attachment 9 to the filter material 13 is required in the upper region of the bag filter 1.

(Third embodiment)
FIG. 3 is a longitudinal sectional view of an example of the bag filter according to the third embodiment.
The third embodiment is an example of the second invention, and is a four-sheet bag filter 1 configured such that the outer bag filter 3 covers the outer side of the inner bag filter 2. The inner filter material 4 (4a, 4b, 4c) made of three pieces constituting the inner bag filter 2 and the outer filter material 5 made of one piece constituting the outer bag filter 3 are joined together. The inner surface 6 of the inner bag filter 2 becomes the outer surface 7 in the upper region of the three inner bag filters 2 in which the lower ends are closed, and is folded back so as to cover the inner bag filter 2 from the outside. The outer bag filter 3 is formed by closing the lower end of the folded outer filter material 5.
The filter end annular piece 11 is used to support the O-ring 10 on the filter material, as in the first embodiment.

  As described in the first to third embodiments, the first invention and the second invention described above are the same as the first invention and the second invention as a result of any manufacturing method. This is applicable if two or more double-sheet bag filters are formed.

(Fourth embodiment)
FIGS. 4A to 4E are views for explaining a bag filter manufacturing method having a two-piece structure according to the fourth embodiment.
This back filter manufacturing method shows an example of a method for manufacturing a bag filter using the same filter material for the inner bag filter and the outer bag filter described in the second embodiment and having the same filter material. .

  First, as shown in FIG. 4A, one rectangular filter material 15 such as filter paper or non-woven fabric is prepared, and the joint 8 is formed in the rectangular filter material 15 as shown in FIG. 4B. Thus, a cylindrical bag filter base 16 was prepared, and one end side of the bag filter base material 16 was closed by heat sealing or the like so as to be the bottom of the inner back filter as shown in FIG. After that, the closed lower end is cut into a triangle. 4D, the inner surface 6 of the bag filter base material 16 on one end side is folded back to cover the outer surface 7 of the bag filter base material 16 on the other end side as shown in FIG. After the other end side of the bag filter base material 16 is closed so as to be the bottom of the outer back filter 3 as shown in (E), it is cut into a triangle to produce a two-sheet bag filter 1.

In the configuration shown in FIG. 4, the O-ring is not disposed near the folding position, but a step of attaching the O-ring to the filter material may be provided at the folding position as necessary.
FIG. 5 shows an embodiment in which a filter fixture 9 such as an O-ring 10 is mounted. In the state shown in FIG. 4C, the filter fixture 9 is fixed to the fixing member 22 as shown in FIG. In addition, it is arranged near the folding position, and then folded in the same procedure as in FIG. 4D, and then the bottom of the outer back filter 3 is closed as shown in FIG. 5B and cut into a triangle. Thus, a two-sheet bag filter can be manufactured. Various types of fixing members 22 can be used, but it is generally easy to use a heat sealing material.

(Fifth embodiment)
FIGS. 6A to 6E are views for explaining a two-sheet bag filter manufacturing method according to the fifth embodiment.
This back filter manufacturing method shows an example of a method for manufacturing the bag filter according to the first embodiment.

  First, as shown in FIG. 6 (A), two kinds of coarse filter materials 18 and a dense filter material 19 having a filter function are joined together at the center to prepare a filter material 20 having a substantially rectangular shape, which is shown in FIG. 6 (B). As shown in FIG. 6C, a filter end portion of the joining position 21 is formed by forming the joining portion 8 in the rectangular filter material 20 and thereby forming a cylindrical bag filter base 16. The O-ring 10 is inserted so as to be hooked on the annular piece 11, and one end side of the bag filter base material 16 is cut into a triangle and closed so as to become the inner back filter 2 as shown in FIG. 6 (D) In addition, after the inner surface 6 of the bag filter base material 16 on one end side is folded back to cover the outer surface 7 of the bag filter base material 16 on the other end side, as shown in FIG. 3 The closed state of the other end side of the bag filter substrate 16 so that the bottom portion, to produce a bag filter 1 of two-lens structure by cutting into triangles.

(Sixth embodiment)
FIGS. 7A to 7D are views for explaining a bag filter manufacturing method having a four-piece structure according to the sixth embodiment.
This back filter manufacturing method shows an example of a method for manufacturing the bag filter according to the third embodiment having the four-sheet configuration.

  First, as shown in FIG. 7A, one outer filter material 5 serving as an outer back filter and three inner filter materials 4a, 4b, and 4c serving as inner filters are connected at the center to form a substantially rectangular shape. A filter material 24 is prepared, and the rectangular filter material 24 is joined into a cylindrical shape as shown in FIG. 7 (B) to create a cylindrical bag filter base 16, and FIG. 7 (C) is a sectional view. The O-ring 10 is inserted so as to be hooked on the filter end annular piece 11 at the joining position 21, and the inner surface of the bag filter base on one end becomes the outer surface of the bag filter base on the other end. After folding back so as to cover, after the one end side and the other end side of the bag filter base material are closed so as to be the bottoms of the outer back filter 2 and the outer back filter 3 as shown in FIG. , It was cut into square to produce a bag filter 1 of four configuration.

  The one outer filter material 5 that serves as the outer back filter 3 is a filter material that exists around the O-ring 10 when the O-ring 10 is folded back as described in the eleventh invention. This is because it is difficult to improve the sealing performance between the filter fixture and the base of the filter device if the thickness of the filter is too thick. If the filter material to be folded is sufficiently thin, a plurality of sheets may be folded.

(Seventh embodiment)
FIGS. 8A to 8C are diagrams for explaining a bag filter according to a seventh embodiment of the present invention, and are diagrams for explaining an example of the bag filter of the sixth invention described above.
In this embodiment, an openable / closable member 25 as an openable / closable means is provided at the bottom region of at least one of the inner bag filter 2 and the outer bag filter 3. As the openable / closable member 25, a fastener, a magic tape, or the like can be used. 8A and 8B are views of the magic tape provided on the inner surface of the bag filter as viewed from the outside, and FIG. 8C is a longitudinal sectional view taken along the line CC of FIG. 8B.

  In particular, by providing an openable / closable member in the bottom region of the inner bag filter, the amount of fluid filtered in the bottom region is extremely reduced by collecting the filtered material in the inner bag filter in the initial stage of filtration. There is an advantage that the adverse effect on the filtration function due to the presence of the openable / closable member in the bottom region can be reduced. In the case where the openable / closable member is provided only in the bottom region of the inner bag filter, it is generally configured so that it can be opened and closed from the inner surface of the inner bag filter.

  Although not shown in this drawing, when the openable / closable member can be opened and closed from the outside of the inner back filter, the outer bag can be provided by providing the openable member from the outside of the bag filter in the bottom region of the outer back filter. After opening the bottom of the filter, the bottom of the inner back filter can be opened for disassembly.

(Eighth embodiment)
FIGS. 9A to 9C are views for explaining a bag filter according to an eighth embodiment of the present invention. FIG. 9A is a front view of the bottom of the bag filter, and FIG. The bottom view seen from the bag filter bottom side, FIG.9 (C) is CC sectional view taken on the line of FIG.9 (A).

The eighth embodiment is an embodiment for explaining an example of the tenth invention using the above-described contact portion. In FIG. 9, the bottom regions of the bag filters 2 and 3 are cut into a substantially semicircular shape, and one side engaging portion 27 of the magic tape 26 is fixed to the semicircular peripheral portion 30 so that the same filter as the bag filter material is obtained. A belt-like abutting portion 29 is prepared by fixing the other side engaging portion 28 of the magic tape 26 to the peripheral edge portion 31 so as to correspond to the one side engaging portion 27 with a material, and the one side engaging portion of the magic tape 26 is prepared. 27 and the other side engaging portion 28 are engaged with each other so that the abutting portion 29 is detachably attached to the bottom regions of the filter backs 2 and 3.
Note that the shape of the bottom region of the bag filter to be cut and the shape of the contact portion can be changed as appropriate.

(Ninth embodiment)
FIGS. 10 and 11 are diagrams for explaining modifications of the bag filter manufacturing method according to the present invention. FIGS. 10A and 10B show a cylindrical back filter base material production step and one end side closing. FIGS. 11 (A) and 11 (B) are diagrams for explaining a manufacturing method in which the bottom process is performed step by step, and FIGS. It is a figure for demonstrating the manufacturing method which performs a process at once.

  First, in the configuration shown in FIG. 10, a step of forming a cylindrical bag filter base material by heat-sealing the peripheral portions of the two filter materials as shown in FIG. As shown in FIG. 10 (B), the step of heat-sealing the peripheral edge of the lower end portion is performed almost simultaneously in the process, and the semicircular lower end portion (one end side) is folded outward toward the other end portion side. In addition, the lower end of the outer back filter is heat-sealed and then cut into a semicircle.

  Moreover, in the structure shown in FIG. 11, the process which makes a cylindrical bag filter base material by heat-sealing the peripheral part of two filter materials as shown in FIG. The process of making the one end side which becomes the lower end part closed by heat sealing process and the process of making the other end side which becomes the lower end part of the outer bag filter closed by heat sealing process are performed almost simultaneously in the process. . Then, as shown in FIG. 11 (B), a process of folding back so as to cover the inner surface of the bag filter base material at one end side as the outer surface of the bag filter base material at the other end side is performed, so A bag filter can be manufactured.

  In such folding, the outer bag filter portion shown in FIGS. 4 to 7 is folded from the outside of the inner bag filter portion, and the inner bag filter portion as shown in FIG. 11 is placed in the outer bag filter portion. No matter which method is used, the resulting two-sheet bag filter has a filter inner surface that is the outer surface in the upper region of the inner filter bag with the lower end closed. The inner bag filter is folded so as to cover from the outside, and the outer bag filter is formed by closing the lower end of the folded filter.

(10th Embodiment)
The tenth embodiment is for explaining the seventeenth to twentieth inventions, and is a technique that can easily and inexpensively manufacture a handle without separately preparing a handle member for the bag filter. The seventeenth to twentieth inventions are improved bag filters from a different viewpoint from the first to sixteenth inventions.
According to a seventeenth aspect of the present invention, a band-shaped filter portion is formed by forming at least one incision portion in a filter material in an opening region of the bag filter, and the band-shaped filter portion is used as a handle when carrying the bag filter. It is characterized by functioning.

In the seventeenth aspect of the invention, “the opening area of the bag filter” refers to the vicinity of the opening into which fluid flows, and generally refers to the area where the above-described filter attachment is located.
The term “incision” is used to include a form in which a region having a predetermined shape (for example, a crescent shape) is excised while leaving the band-shaped filter part, in addition to a form in which a linear cut is made.
The seventeenth invention does not exclude the form of a handle in which one end side of the band-shaped filter portion is separated from the filter material and supported only on the other end side.

According to the seventeenth invention, when making a handle for a bag filter, the filter material itself can be used as a material for the handle, so that it is not necessary to prepare a separate belt-like member for making the handle, thereby reducing the manufacturing cost. be able to.
An eighteenth aspect of the invention is the invention according to the seventeenth aspect of the invention, wherein the incision is formed so that both ends of the band-shaped filter portion are not separated from the filter material.
According to the eighteenth aspect of the invention, when the band-shaped filter portion is made to function as a handle for carrying the bag filter, one end of the band-shaped filter portion is not separated from the filter material. Since the connection state is maintained, it is easy to use as a handle and the strength of the handle can be improved.

A nineteenth invention is characterized in that, in the invention according to any one of the seventeenth to eighteenth inventions, two notches are formed in the opening area of the bag filter to form a pair of handles.
If it is the 19th invention, two handles will exist in the opening part of a filter bag, and usability can be improved as a handle.

A twentieth aspect of the invention is characterized in that, in the invention according to any one of the seventeenth to nineteenth aspects, a reinforcing structure is formed at the proximal end portion of the handle.
In the twentieth invention, examples of the “reinforcing structure” include a structure in which the peripheral portion of the band-shaped filter portion is sewn with a reinforcing thread, and a structure in which the peripheral portion of the band-shaped filter portion is heat-melted.
According to the twentieth invention, even a handle formed by forming an incision portion from the filter material in the opening region can have sufficient strength as a handle due to the presence of the reinforcing structure.

FIGS. 13A to 13D are views showing examples of the seventeenth to twentieth inventions, respectively, and FIG. 13A shows two linear cuts in the opening region of the filter bag. FIG. 13B is a diagram showing a state in which the band-shaped filter portion is pulled, FIG. 13C is a perspective view in which the filter fixture is attached by a predetermined method, and FIG. 13D is a plan view thereof. FIG.
As shown in FIGS. 13A and 13B, a pair of band-shaped filter portions 35 are formed by making two cuts 34 in the opening region of the filter bag 33, and heat is applied to at least the base end portion of the band-shaped filter portion 35. The reinforcing portion 37 is formed by processing or the like to increase the strength. And as shown in FIG.13 (C), the filter attachment 9 is attached to an opening part area | region by a predetermined method, and a pair of strip | belt-shaped filter part 35 is used as a handle 36. FIG.

  As one method for changing from the state shown in FIG. 13B to the state shown in FIG. 13C, the filter is attached by the end region 38 (see FIG. 13B) of the filter material on which the band-like filter material 35 is formed. There is a method of manufacturing the product by wrapping the tool and fusing the end region 38 to the filter material on the inner surface of the bag filter by heat sealing or the like.

1A to 1C are longitudinal sectional views of a two-bag bag filter according to the first embodiment. FIG. 2 is a longitudinal sectional view of the bag filter according to the second embodiment. FIG. 3 is a longitudinal sectional view of the bag filter according to the third embodiment. 4 (A) to 4 (E) are diagrams for explaining the fourth embodiment, and are diagrams for explaining a bag filter manufacturing method having two sheets. FIGS. 5 (A) and 5 (B) are each a modification of the fourth embodiment, and are diagrams for explaining a bag filter manufacturing method provided with a process of attaching a filter fixture. FIGS. 6A to 6E are diagrams for explaining the fifth embodiment, and are diagrams for explaining a method for manufacturing a two-bag bag filter. FIGS. 7A to 7D are diagrams for explaining the sixth embodiment, and are diagrams for explaining a bag filter manufacturing method having a four-sheet structure. FIGS. 8A to 8C are views for explaining a bag filter according to a seventh embodiment of the present invention. FIGS. 9A to 9C are views for explaining a bag filter according to an eighth embodiment of the present invention. FIG. 10 is a view for explaining a modification of the bag filter manufacturing method according to the present invention. FIG. 11 is a view for explaining a modification of the bag filter manufacturing method according to the present invention. FIG. 12 is a diagram showing an example of a conventional filter device in which a filter layer wound in a spiral shape is arranged. FIGS. 13A to 13D are views for explaining a bag filter according to a tenth embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bag filter, 2 ... Inner bag filter, 3 ... Outer bag filter, 4 ... Inner filter material, 5 ... Outer filter material, 6 ... Inner surface, 7 ... Outer surface, 9 ... Filter fixture, 11 ... Filter end annular piece , 16 ... back filter base material, 21 ... joining position, 25 ... openable / closable member, 26 ... magic tape, 27 ... one side engaging part, 28 ... other side engaging part, 29 ... contact part, 30 ... peripheral part 31 ... A peripheral part.

Claims (16)

In the two-sheet back filter configured so that the outer bag filter covers the outer side of the inner bag filter, the inner surface of the filter is the outer surface in the upper region of one inner filter bag in which the lower end is closed, A back filter which is folded back so as to cover the inner back filter from the outside, and the outer back filter is formed by closing a lower end of the folded filter. In the back filter of at least two sheets configured so that the outer back filter covers the outside of the inner back filter, the inner filter material made of at least one sheet constituting the inner back filter and at least the outer back filter It is composed by connecting the outer filter material made of one piece.
An inner surface of the inner back filter is an outer surface in an upper region of at least one inner back filter in which the lower end is closed, and is folded back so as to cover the inner back filter from the outside, and the lower end of the folded filter An outer back filter is formed by closing the back filter. The back filter according to any one of claims 1 to 2, wherein at least one of the inner filter material and the outer filter material has different characteristics in terms of filter characteristics. The back filter according to any one of claims 1 to 3, wherein the filter of the outer back filter is denser in terms of filtration than the inner back filter. The back filter according to any one of claims 1 to 4, wherein a filter fixture is located near the folding position. The back filter according to any one of claims 1 to 5, wherein a back and open means is provided in at least one of the inner back filter and the outer back filter. The back filter according to claim 6, wherein the openable / closable means is provided only in the inner back filter. The back filter according to any one of claims 5 to 7, wherein the filter mounting tool is detachably fixed from the filter back surface. The back filter according to any one of claims 2 to 8, wherein a filter end annular piece is formed at a joining position of the inner filter material and the outer filter material, and the filter end annular piece is filtered. Back filter used as a support for the fixture. In the back filter according to any one of claims 1 to 9, the bottom region of the back filter is cut into a predetermined shape, and the one-side engaging portion of the openable / closable means is fixed to the peripheral portion of the predetermined shape, An abutting portion is prepared by fixing the other side engaging portion of the openable / closable means to the peripheral edge so as to correspond to the one side engaging portion with the same filter material as the back filter material, and the one side engaging portion of the openable / closable means A back filter in which the abutting portion is detachably attached to the bottom region of the filter back by engaging the engagement portion with the other side engaging portion. The back filter according to any one of claims 1 to 10, wherein the periphery of the filter fixture is covered with only one filter material. A back filter base material creating step for creating a long and narrow cylindrical back filter base material that is expected to be folded, and the inner surface of the back filter base material on one end side is folded back to cover the outer surface of the back filter base material on the other end side. Including the folding step, the one end side bottoming step for closing one end side of the back filter base material, and the other end side bottom closing step for closing the other end side of the back filter base material A back filter manufacturing method, wherein a back filter having two sheets is formed so that an outer back filter covers an outer side of the back filter. A back filter base material creating step for joining a plurality of filter materials having different filter functions to create an elongated cylindrical back filter base material that is expected to be folded, and the inner surface of the back filter base material on one end side is on the other end side A folding step of folding back corresponding to the joining of the different filter materials so as to cover the outer surface of the back filter substrate, a one end closing step for closing one end of the back filter substrate, and a back filter Including a step of closing the other end side of the base material on the one end side, and forming a back filter having at least two sheets so that the outer back filter having a different filter function covers the outside of the inner back filter. A method for manufacturing a back filter. The back filter manufacturing method according to any one of claims 12 to 13, further comprising a step of positioning a filter fixture near the folding position. 15. The back filter manufacturing method according to claim 12, further comprising a step of providing an openable / closable means on at least one of the inner back filter and the outer back filter. The back filter manufacturing method according to any one of claims 12 to 15, further comprising a step of detachably fixing the filter fixture from the filter back surface.

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