JP4550406B2 - Bag filter and bag filter manufacturing method - Google Patents

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.

Japanese Patent Application Laid-Open No. 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 bag filter having a spiral filter material is difficult to clean the filter material.
( D ) In particular, with a bag filter in which the filter attachment is attached to a bag 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. There is also a risk that the filter fitting is deformed or damaged by the cleaning.

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.
The bag filter according to the first aspect of the present invention is an at least two-piece bag filter configured so that the outer bag filter covers the outer side of the inner bag filter, and an inner filter material made of at least one of the inner bag filters. , Yes by joining an outer filter material made of at least one constituting the outer bag filters,
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 the inner bag filter is folded back at the folding position so as to cover from the outside. The outer bag filter is formed by closing the lower end of the filter,
It is located inside the bag filter so as to wind the filter mounting tool near the folding position ,
The filter fixture is detachable from the bag filter surface,
Openable / closable means is provided only on the inner bag filter, and the openable / closable means is a detachable Velcro (registered trademark) or fastener having a male engaging portion and a female engaging portion arranged in a plane. It is characterized by.

The second invention is the first invention, at least one of the outer filter material and the inner filter material on the filter characteristic, characterized in that has a different characteristic.
The third invention is the first invention, by forming the filter end annular piece which is formed at an end portion of the inner filter material joining position between the outer filter material and the inner filter material, the folded position near wherein the inside of the bag filter to the filter end annular piece was used as a support means of the filter fitting.
A bag filter manufacturing method according to a fourth aspect of the present invention includes a bag filter base material creating step of creating a slender cylindrical bag filter base material by connecting a plurality of filter materials having different filter functions, and a filter attachment tool near the folding position. While being positioned inside the bag filter so as to be wound , the inner surface of the bag filter base material on one end side is folded back corresponding 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. A detachable Velcro tape (registered trademark) or a fastener opening / closing means that has a male engaging portion and a female engaging portion arranged in a plane shape is provided only in the folding process and the inner bag filter base. Yes and step of the closed inner bag filter substrate, and an outer bag filter substrate side閉底step of the closed outer bag filter substrate Characterized by making at least two configurations of a bag filter so as to cover the outer bag filters of different filter function outside the inner bag filter.
In the first invention, the filter of the outer bag filter can be made denser in terms of filtration than the inner bag filter .
In the first invention, it is also Flooding around filter fittings filter material only one. If it is this structure , the sealing performance of a filter attachment tool and the base | substrate of a filter apparatus can be improved.

Hereafter, each structure of the said 1st invention- 4th invention is demonstrated.
In the first invention, “close the lower end” means a case where the lower end is closed by a heat seal or the like .
Oite the first invention means a case that can be regarded as one in the handling of folded and "one", one of the filter material is in multiple layers constituted by pre made the papermaking process and the bonding process In some cases, the concept is included in “one sheet”.

  In the first invention, the shape of the bag filter is generally cylindrical, but it does not exclude other shapes.

In the first invention, “at least two-sheet configuration” means that the filter material is two or more when folded, and includes the case where each sheet has a multi-layer configuration as described above. .
The number of inner bag filters and the number of outer bag filters may be different.
In the second 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 first 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 first invention, the “filter attachment” refers to a member for attaching the bag filter to the base of the filter device or the like, and is used as a concept of an O-ring or a support frame.
In general, the filter attachment is generally configured in a circular shape, a rectangular shape, or the like .

  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.

The effects of each invention will be described below.
In the case of the first invention, when the outer bag filter is disposed outside the inner bag filter, the outer bag filter is formed by folding back the upper region of the inner bag filter having at least one sheet. The bag filter having the configuration can be easily and inexpensively manufactured. Further, since the filter mounting tool is located near the folding position, the bag filter can be easily supported and mounted on the base of the filter device. Since the openable / closable means is provided, it is possible to unfold the bag by opening the openable / closable means, and the bag filter can be easily disassembled and cleaned as compared with a bag filter having no openable means. Become. Further, by opening the openable / closable means, it is possible to easily remove the filtered substance accumulated in the bottom region of the bag filter. 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. Since the filter fitting is in detachable from the bag filter surface, it becomes possible to remove the filter fitting from the filter material when used again to wash the bag filter, wash the filter material when cleaned It is easy to eliminate the risk of deformation or breakage of the filter fixture by washing.
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.

In the second 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 bag filter. Since it can be changed in accordance with this, a highly functional bag filter can be configured.

According to the third 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. Since the filter end annular piece, which is likely to occur when the inner bag filter material and the outer bag filter material are joined together by a seal or the like, can be positively used as a support means for the filter fixture, the bag filter can be easily and inexpensively Can be configured.
According to the fourth aspect of the invention, 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. Since the filter attachment tool can be positioned near the folding position, 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. The bag filter can be easily disassembled and cleaned as compared with a bag filter having no openable / closable means. Further, by opening the openable / closable means, it is possible to easily remove the filtered substance accumulated in the bottom region of the bag filter. When cleaning, the filter material is easy to clean, and there is no risk of the filter fitting 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.

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 third 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. 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 first 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 described above has a structure of two or more sheets as described in the first invention, regardless of the manufacturing method. If a bag filter is formed, it is applicable.

(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 bag filter manufacturing method shows an example of a method of 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 material 16 is prepared, and the one end side of the bag filter base material 16 is closed by heat sealing or the like so as to be the bottom of the inner bag 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 bag 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 placed near the folding position, and then folded in the same procedure as in FIG. 4D, and then the bottom of the outer bag 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 bag filter manufacturing method shows an example of a method for manufacturing the bag filter according to the first embodiment.

First, as shown in FIG. 6A, a filter material 20 having a substantially rectangular shape is prepared by connecting two types of inner filter material 18 and outer filter material 19 having a filter function at the center, and shown in FIG. 6B. In this way, a cylindrical bag filter base material 16 is formed by forming the joint 8 on the rectangular filter material 20, and the filter end at the joining position 21 as shown in the sectional view of FIG. The O-ring 10 is inserted so as to be hooked on the part annular piece 11, and one end side of the bag filter base material 16 is cut into a triangle so as to be the inner bag filter 2 as shown in FIG. At the same time, 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, and then the outer bag filter 3 of the outer bag filter 3 is shown in FIG. bottom So as to be in a state of closing the other end of the bag filter substrate 16, 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 bag 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 bag 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 in a cylindrical shape as shown in FIG. 7 (B) to create a cylindrical bag filter base material 16, and the cross section is shown in FIG. 7 (C). As shown in the figure, 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 side becomes the outer surface of the bag filter base on the other end side. 7D, 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 bag filter 2 and the outer bag filter 3 as shown in FIG. rear, It was cut into square to produce a bag filter 1 of four configuration.

Incidentally, what the outer filter material 5 comprising an outer bag filter 3 into one, as described above, the thickness of the filter material present around the O-ring 10 when folded to involve an O-ring 10 is This is because if it is too thick, it is difficult to improve the sealing property between the filter fixture and the base of the filter device. If the filter material to be folded is sufficiently thin, a plurality of sheets may be folded.

(Seventh embodiment)
FIGS. 8A to 8C are views 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 above-described invention .
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 or a magic tape 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 and closable member is attached so that it can be opened and closed from the outside of the inner bag filter, the outer bag can be provided by providing the openable and closable member from the outside of the bag filter in the bottom region. After opening the bottom of the filter, the bottom of the inner bag 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 a form using a contact part. 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 region of the bag filters 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, and FIGS. 10A and 10B illustrate a cylindrical bag filter base material creation step and a one-end-side bottom closing step. FIGS. 11 (A) and 11 (B) are diagrams for explaining a manufacturing method performed at a time step by step. FIG. 11 (A) and FIG. 11 (B) show a bag filter base material creation step, one end side closing step, and the other end side closing step. It is a figure for demonstrating the manufacturing method performed 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 portion of the outer bag 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. . And as shown in FIG.11 (B), by carrying out the process of folding back so that the inner surface of the bag filter base material of one end side may become the outer surface of a bag filter base material in the other end side, it is 2 sheets structure 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 bag filter 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.

( Reference example )
This reference example is for explaining another form of the bag filter, and is a technique that can easily and inexpensively manufacture a handle without separately preparing a handle member for the bag filter. In addition, this invention improves the bag filter from a viewpoint different from the said 1st invention- 4th invention.
In this bag filter, by forming at least one incision in the filter material in the opening area of the bag filter, a band-shaped filter unit is formed, and the band-shaped filter unit functions as a handle for carrying the bag filter. It is characterized by that.

In this 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.
In addition, in the said invention, the form of the handle which isolate | separates one end side of a strip | belt-shaped filter part from a filter material, and supports only by the other end side is not excluded.

According to the present invention, when making the handle of the bag filter, the filter material itself can be used as the material of the handle, so that it is not necessary to prepare a separate belt-like member for making the handle, thereby reducing the manufacturing cost. Can do.
In the invention described above, the incision portion is formed so that both ends of the belt-like filter portion are not separated from the filter material.
According to the present invention , when the band-shaped filter part functions as a handle for carrying the bag filter, one end of the band-shaped filter part is not separated from the filter material, so the band-shaped filter part is connected at both ends like a bridge shape. Since the state is maintained, it is easy to use as a handle and the strength of the handle can be improved.

Another invention is characterized in that, in the invention described above, two notches are formed in an opening region of the bag filter to form a pair of handles.
If it is this invention, two handles will exist in the opening part of a bag filter, and it can raise usability as a handle.

Yet another invention is characterized in that, in the invention described above , a reinforcing structure is formed at the proximal end of the handle.
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.
If it is this invention, even if it is a handle formed by forming an incision part from the filter material of an opening part area, sufficient intensity | strength as a handle can be given by presence of a reinforcement structure.

13 (A) to (D) are diagrams each showing an example of the invention , and FIG. 13 (A) is a diagram showing a state in which two linear cuts are made in the opening area of the bag filter, FIG. 13B is a diagram showing a state where the belt-like filter portion is pulled, FIG. 13C is a perspective view showing a state where a filter attachment is attached by a predetermined method, and FIG. 13D is a plan view thereof.
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 bag filter 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 method for manufacturing a two-bag bag filter. 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 step 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 method for manufacturing a four-bag bag filter. 8A to 8C are views for explaining the bag filter according to the seventh embodiment. FIGS. 9A to 9C are views for explaining a bag filter according to an eighth embodiment. FIG. 10 is a view for explaining a modification of the bag filter manufacturing method. FIG. 11 is a diagram for explaining a modification of the bag filter manufacturing method. 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 reference example .

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 ... bag filter base material, 21 ... joining position, 25 ... openable / closable member.

Claims (4)

In the bag filter of at least 2 sheets comprised so that an outside bag filter might cover the outside of an inside bag filter, the inside filter material made from at least 1 sheet which constitutes an inside bag filter, and at least which constitutes an outside bag filter It is connected to the outer filter material made of one piece.
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 the inner bag filter is folded back at the folding position so as to cover from the outside. The outer bag filter is formed by closing the lower end of the filter,
It is located inside the bag filter so as to wind the filter mounting tool near the folding position ,
The filter fixture is detachable from the bag filter surface,
Openable / closable means is provided only on the inner bag filter, and the openable / closable means is a detachable Velcro (registered trademark) or fastener having a male engaging portion and a female engaging portion arranged in a plane. A bag filter characterized by. In the bag filter of claim 1, at least one is a filter characteristic on, and have the bag filter becomes different characteristics of the outer filter material and the inner filter material. In the bag filter of claim 1, to form a filter end annular piece which is formed at an end portion of the inner filter material joining position between the outer filter material and the inner filter material, the folded position near bag filter using the filter end annular piece inside the bag filter as a support means of the filter fitting. By connecting a plurality of filter material of different filtering functions, is located inside the bag filter to engulf the bag filter substrate preparing step of preparing a bag filter substrate of said elongated tubular, the filter fitting near the folded position On the other hand, only the inner bag filter base material is folded back in response to the joining of the different filter materials so that the inner surface of the bag filter base material on one end side covers the outer surface of the bag filter base material on the other end side. In addition, a removable magic tape (registered trademark) or fastener opening / closing means having a male engagement portion and a female engagement portion arranged in a plane is provided to close the inner bag filter base. a step, and an outer bag filter substrate side閉底step of the closed outer bag filter substrate, the outside of the inner bag filter different to Bag filter manufacturing method characterized by making a bag filter of at least two lenses so as to cover the outer bag filters filter function.

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