TW201440875A - Apparatus for manufacturing filter material - Google Patents

Abstract

To provide an apparatus for manufacturing filter medium which is capable of preventing an electric discharge from occurring between flat plate portions adjacent to each other when a space between the flat plate portions is widened, and inhibiting lowering of dust collection efficiency of a filter medium due to formation of a through-hole in a web of a filter medium by the electric discharge. A device for manufacturing filter medium includes: a pleats compression portion that conveys along one direction a region of a web of a filter medium which is formed in a pleated shape and compressing the same along the one direction, thereby causing each space between adjacent flat plate portions to be narrowed; a neutralizing portion that neutralizes the web of the filter medium by emitting ions onto the web of the filter medium at an end portion of the pleats compression portion on a downstream side in a direction of conveying the web of the filter medium; and a pleats release portion that releases the region of the web of the filter medium which is compressed in the pleats compression portion from a compressed state, thereby causing each space between the adjacent flat plate portions to be wider than the space in the pleats compression portion.

Description

Filter filter manufacturing device Field of invention

The present invention relates to a device for producing a filter medium for trapping particles contained in a filter gas, and more particularly to a filter medium for producing a sheet-shaped filter material billet which is pleated.

Background of the invention

In the clean room or the like of a factory for manufacturing semiconductors and liquid crystals, a filter medium configured to trap particles contained in the filtered gas is used. Such a filter medium is formed by bending a billet-shaped filter material billet at a plurality of positions to form a wrinkle shape. Such a filter medium includes a curved portion formed by bending a filter material blank, and a plurality of flat portions formed by facing the curved portion and facing each other for holding adjacent flat portions A plurality of interval holding portions spaced apart.

In the manufacturing apparatus for producing such a filter medium, a pleated portion, an adhesive application portion, and a filter material forming portion are provided, and the pleated portion is configured to convey the sheet-shaped filter material in one direction. Bending (pleating) at a plurality of positions to form a wrinkle shape, the aforementioned adhesive The coating unit applies an adhesive to the filter material blank which is pleated by the pleated portion, and the filter material forming portion re-forms the filter material blank coated with the adhesive through the adhesive application portion to form a filter. Filter medium (refer to Patent Documents 1 and 2).

According to the manufacturing apparatus described above, by forming the curved portion in the pleated portion, it is possible to impart crease characteristics to the region of the filter blank which is the curved portion. Therefore, when the adhesive is applied to the filter blank in the adhesive application portion, even if the wrinkle-forming region (hereinafter referred to as a wrinkle region) of the filter blank is stretched and unwound, it becomes easy to The filter medium forming portion returns to a wrinkle shape.

In order to maintain such crease characteristics well, it is proposed to provide a manufacturing apparatus for a pleated compression portion that compresses the crease-like region of the filter material blank in one direction. In the pleated compression portion, since the pleated regions can be compressed so that the flat portions are spaced apart from each other, the crease characteristics of the filter material can be enhanced. Thereby, even if the wrinkle-like region is unfolded from the compressed state, the crease property of the filter material blank can be favorably maintained.

However, in the manufacturing apparatus as described above, since the filter material blank and the manufacturing apparatus are in sliding contact, there is a possibility that the filter material is charged. Further, when the wrinkle-like region of the filter material blank is charged in a state where the pleated compression portion is compressed, and the crease-like region is unfolded from the compressed state, the interval between the flat plate portions is widened and the phase is widened. A situation in which the adjacent flat portions are discharged. Such discharge becomes a factor that forms a through hole in the flat plate portion, and the dust collecting efficiency of the filter medium is lowered due to the formation of such a through hole.

Prior technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2003-265910

Patent Document 2: Japanese Patent Laid-Open Publication No. 2004-321937

Summary of invention

Accordingly, an object of the present invention is to provide a filter medium manufacturing apparatus which can prevent discharge between adjacent flat plate portions when the interval between the flat plate portions is widened, and can suppress formation of a blank in the filter material due to such discharge. The pores cause a decrease in the dust collecting efficiency of the filter medium.

The apparatus for manufacturing a filter medium according to the present invention comprises: a pleating unit that bends a filter material billet in a direction intersecting perpendicularly in one direction in a plurality of positions in one direction of the sheet-shaped filter material to form a plurality of The curved portion is configured such that the regions other than the curved portions are disposed to face each other to form a plurality of flat plate portions, and the filter material blank is formed into a wrinkle shape; the pleated compression portion is formed to form a wrinkled region in the filter material blank Compressing in one direction while compressing in one direction to bring the flat plate portions closer to each other; the static eliminating portion discharges ions to the filter material blank at the end portion of the pleated compression portion on the downstream side in the filter material conveying direction to execute the filter material The static elimination of the billet; and the pleating development portion expands the region of the filter material billet compressed by the pleated compression portion from the compressed state so that the interval between the flat plate portions is wider than when the pleated compression portion is formed .

According to this configuration, since the static eliminating portion is provided and the interval between the flat plate portions is widened in the pleating and expanding portion, it is possible to prevent the occurrence of discharge between the adjacent flat plate portions. Specifically, in the end portion of the pleated compression portion on the downstream side in the direction in which the filter material is conveyed, a region in which a wrinkle-like region is formed in the filter material blank (hereinafter also referred to as a wrinkle-like region) becomes a flat portion. The interval is close to the state. That is, since the wrinkle-like region of the filter material billet becomes a charged state at the end portion of the pleated compression portion on the downstream side in the direction in which the filter material is conveyed, the filter body is removed from the static electricity portion at the end portion. The material releases ions, which can pass through the contact between the filter material and the ions, so that the filter material is statically eliminated. Thereby, even when the pleating development portion widens the interval between the flat plate portions, it is possible to prevent the discharge from occurring between the adjacent flat plate portions.

Preferably, the pleating and compressing portion is provided with a gripping portion that forms a wrinkle-like region from the double-sided side of the filter material blank, and a pressurizing portion that is disposed on the filter embryo than the grip portion a downstream side of the material conveying direction for pressurizing at least one side of the filter material blank to form a wrinkle-like region in the filter material blank; and the static electricity removing portion is preferably configured to be transported in the filter material at the pressurizing portion The end portion on the downstream side of the direction discharges ions to the filter material blank.

With this configuration, the wrinkle-like region of the filter material is conveyed in a state of being sandwiched by the gripping portion, and is conveyed while being pressurized by the pressurizing portion, so that it is easy to slide by the grip portion and the pressurizing portion. charged. However, since the ions are discharged from the static electricity removing portion to the filter material billet at the end portion on the downstream side in the filter material billet conveying direction of the pressurizing portion, it is possible to enter the pleating development portion (that is, no discharge occurs between the adjacent flat plate portions). In the state of the filter material, the filter material is statically removed. Thereby, even if the pleating expansion portion widens the interval between the flat portions At the same time, it is still possible to prevent discharge from occurring between adjacent flat plate portions.

Preferably, the static eliminating portion is configured to emit ions from one side of the filter material blank toward the upstream side in the conveying direction of the filter material.

According to this configuration, the electricity removing unit is configured to discharge ions from one side of the filter material to the upstream side in the conveying direction of the filter material, whereby the ions discharged from the static eliminating unit can efficiently contact the filter material. . Thereby, it is possible to efficiently perform the static elimination of the filter material blank, and it is possible to more effectively prevent the discharge between the adjacent flat plate portions when the pleating development portion widens the interval between the flat plate portions.

As described above, according to the present invention, when the interval between the flat plate portions is widened, the discharge between the adjacent flat plate portions can be prevented, and the filter medium can be prevented from being formed in the filter material blank by the through holes. Dust collection efficiency is reduced.

1‧‧‧ manufacturing equipment

2‧‧‧pleating processing department

2a‧‧‧ Blade

2L‧‧‧ track

3‧‧‧Adhesive Coating Department

3a‧‧‧jecting nozzle

3b‧‧‧Up and down conveyor

4‧‧‧Filter material forming department

5‧‧‧pleating compression department

5a‧‧‧ Holding Department

5b‧‧‧Pressure

5c‧‧‧ lower side panel

5d‧‧‧Upper side panel

5e‧‧‧Pressure device

6‧‧‧Electrical device

7‧‧‧Pleated expansion

7a‧‧‧ sloping plate

A‧‧‧Filter material

A1‧‧‧Porous layer

A2‧‧‧ substrate layer

A3‧‧‧Bending area

A4‧‧‧ non-bending area

B‧‧‧ fusion road department

F1‧‧‧Filter filter

F1a‧‧‧Bend

F1b‧‧‧ Flat Department

F1c‧‧‧Interval Maintenance Department

L1‧‧‧ length

L2‧‧‧ height

Fig. 1 is a schematic view showing a manufacturing apparatus of a filter medium according to the embodiment.

Fig. 2 is a perspective view showing a state in which an apparatus for manufacturing a filter medium of the same embodiment is coated with an adhesive on a filter material blank, and a partial enlarged view thereof.

Fig. 3 is a perspective view of a filter medium manufactured by using the apparatus for manufacturing a filter medium of the same embodiment.

Fig. 4 is a cross-sectional view showing a filter medium manufactured by using the apparatus for manufacturing a filter medium of the same embodiment.

Form for implementing the invention

Hereinafter, embodiments of the present invention will be described with reference to Figs. 1 to 4 . In the following drawings, the same or equivalent components will be denoted by the same reference numerals, and the description thereof will not be repeated.

As shown in Fig. 1, the apparatus for manufacturing a filter medium according to the present embodiment (hereinafter, simply referred to as a manufacturing apparatus) 1 is configured to be wrinkled while being conveyed in one direction while forming a sheet-shaped filter material blank A. The pleated shape (pleating process) forms the filter medium F1. The filter material blank A is formed by forming a sheet shape with one side being the long side. In the present embodiment, the filter material blank A is formed by using a configuration in which the long side is formed in one direction and the long shape is formed, and the sheet is formed by being unwound from the wound state.

Here, the filter material blank A will be described. The filter material blank A is configured to trap particles in the filtered gas. Specifically, the filter material blank A is provided with a porous layer A1 that collects particles contained in the filtered gas and a base layer A2 that has air permeability. In the present embodiment, the filter material blank A is configured to have a plurality of (specifically, two) base material layers A2, and a porous layer A1 is laminated between the two base material layers A2.

The porous layer A1 is formed using a porous sheet (hereinafter also referred to as a porous sheet) capable of collecting the particles. The porous sheet body is not particularly limited, and may be appropriately selected depending on the use of the filter medium F1. For example, a sheet of PTFE sheet, a melt-blown nonwoven fabric, an electret filter, or a glass fiber can be used. In the present embodiment, a PTFE sheet is used as the porous sheet. The pressure loss of the PTFE sheet at a penetration flow rate of 5.3 cm/sec is preferably 50 mmH ₂ O or less. In addition, it is preferable that the PTFE sheet has a collection efficiency (calculated as in the following examples) at a flow rate of 5.3 cm/sec and a particle diameter of 0.1 μm or more and 0.2 μm or less, which is 80% or more. The ratio is preferably 99.9% or more, and the PF value is preferably 22 or more.

The base material layer A2 is formed using a sheet having air permeability (hereinafter also referred to as a gas-permeable sheet). The air-permeable sheet is not particularly limited, and for example, a nonwoven fabric, a woven fabric, a mesh, a polymer fiber, or the like can be used. In particular, in the case where the porous layer A1 (porous layer) and the base layer A2 (air permeable sheet) are thermally welded (thermally laminated), it is preferable to use a gas permeable property formed of a thermoplastic material. Sheet.

The material of the air permeable sheet may, for example, be a polyolefin such as polyethylene or polypropylene, a nylon, a polyester, or an aramid (specifically, an aromatic polyamine or the like), or Such composites (for example, non-woven fabrics formed from fibers of a core/sheath construction, two-layer non-woven fabrics of low melting point materials and high melting point materials, etc.). Further, examples of the material of the air-permeable sheet include fluorine compounds such as PFA (tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer), FEP (tetrafluoroethylene/hexafluoropropylene copolymer), and porous membrane of PTFE. Porous membrane.

In particular, it is preferable to use a non-woven fabric formed of a synthetic fiber having a core component having a relatively high melting point as a sheath component as a core-sheath structure composite fiber and a non-woven fabric composed of a low melting point material and a high melting point material. Aerated sheet. By using such a permeable sheet, when the porous layer sheet (porous layer A1) and the air permeable sheet (base layer A2) are thermally laminated, the permeable sheet can be suppressed. The layer A2) shrinks. Moreover, by using such a permeable sheet, the workability at the time of pleating processing can be improved, and the position (folding pitch) for bending the filter material blank A can be increased.

The method of forming the filter material blank A having the above configuration is not particularly limited, and for example, a hot melt may be disposed between the porous sheet forming the porous layer A1 and the air permeable sheet forming the base layer A2. A method of applying a pressure sensitive adhesive to a porous sheet and a permeable sheet. Alternatively, a method in which the heat permeable sheet is softened to be crimped (thermally laminated) with the porous sheet may be employed.

The manufacturing apparatus 1 of the present embodiment is provided with a pleated portion 2 for pleating the filter material blank A, an adhesive application portion 3 for applying an adhesive to the filter material blank A, and a filter material A for applying the adhesive. The filter medium forming portion 4 of the filter medium F1 is formed. Further, the manufacturing apparatus 1 is further provided with a pleated compression portion 5 that compresses a region in which the crease-like region of the filter material blank A is compressed in one direction, and a static elimination portion that performs static elimination of the filter material blank A (specifically, a static elimination device) 6. The pleating development portion 7 in which the region of the filter material blank A compressed by the pleated compression portion 5 is unfolded from the compressed state.

The pleated portion 2 is configured to convey the sheet-shaped filter material blank A in one direction (longitudinal direction). Further, the pleated portion 2 is provided with a pair of blade-shaped blades 2a and 2a formed in a plate shape. Further, the pleating processing unit 2 is configured to convey the filter material blank A between the pair of blade plates 2a and 2a. Moreover, the pair of blades 2a and 2a are arranged in the other direction (width direction) perpendicularly intersecting one direction (longitudinal direction) of the filter blank A. Further, the filter material blank A when being conveyed to the pleating portion 2 should be cut to a predetermined width.

And, by making the pair of blades 2a, 2a respectively along the track 2L Actuate to pleat the filter blank A. Specifically, the blade blank 2a is bent in the width direction from one side to the other side by the blade 2a, and is bent along the longitudinal direction of the filter blank A with the blade 2a passing through one of the blades 2a. The position of the regions is spaced apart, and the filter blank A is bent in the width direction from the other side toward the one side by the other blade 2a. In other words, the pleated portion 2 is configured to be reciprocating, and the filter blanks A are passed through the pair of blades 2a and 2a so as to be spaced apart from each other in the longitudinal direction and alternately folded (folded). Thereby, the filter material blank A is bent in the other direction (width direction) in one direction (length direction) of the sheet-shaped filter material blank A to form a plurality of curved portions F1a, and the curved portions F1a are simultaneously formed. The other regions are arranged to face each other to form a plurality of flat plate portions F1b, and thus a wrinkle-like region (hereinafter also referred to as a wrinkle-like region) is formed in the sheet-shaped filter material blank A.

The corrugated region of the filter material blank A is conveyed to the pleated compression portion 5. The pleated compression portion 5 is configured such that the crease-like region of the filter material blank A is compressed in one direction while being conveyed in one direction (corresponding to the direction of one direction of the sheet-shaped filter material blank A, that is, the longitudinal direction). Specifically, the pleated compression unit 5 is provided with a holding portion 5a that sandwiches the crease-like region of the filter material blank A from the double-sided side of the filter material blank A, and the pressurizing portion 5a. The 5b is placed on the downstream side in the transport direction of the filter material blank A compared to the grip portion 5a, and pressurizes the wrinkle region of the filter material blank A from at least one side of the filter material blank A.

In the present embodiment, the pleated compression portion 5 is a lower side plate 5c for placing a corrugated region of the filter material blank A, and is disposed on the lower side plate 5c. The upper upper side plate 5d and the pressurizing device 5e for pressurizing the corrugated region of the filter material blank A are constituted. In addition, the region of the lower side plate 5c located on the upstream side in the conveyance direction and the upper side plate 5d constitute the holding portion 5a, and the region of the lower side plate 5c on the downstream side in the conveyance direction and the pressurizing device 5e constitute the pressurizing portion 5b.

The grip portion 5a is configured to sandwich a wrinkle-like region of the filter material blank A between the lower side plate 5c and the upper side plate 5d. Thereby, the grip portion 5a (specifically, the lower side plate 5c and the upper side plate 5d) is brought into contact with the surface of each of the curved portions F1a on the mountain side. Then, by holding the corrugated region of the filter material blank A in one direction, the grip portion 5a (specifically, the lower side plate 5c and the upper side plate 5d) is in sliding contact with each curved portion F1a.

On the other hand, the pressurizing portion 5b is configured to receive the pressurization of the pressurizing device 5e from above by the wrinkle region of the filter material blank A placed on the lower side plate 5c. By pressing the corrugated region of the filter material blank A by the pressurizing portion 5b, the transport speed of the filter material blank A in the pleated compression portion 5 is pleated from the pleated portion 2 The conveying speed of the filter material blank A of the compression unit 5 is also slow. Therefore, in the pleated compression portion 5, the crease-like region of the filter material blank A is compressed in one direction (the longitudinal direction of the filter material blank A), and the flat portion F1b is brought closer to each other, and the bending portion is strengthened. F1a crease characteristics. By reinforcing the crease characteristics, the crease-like portion of the filter material blank A can be easily stretched and formed in the crease-like portion 4 in a wrinkle-like shape. Further, in order to effectively maintain the crease characteristics, it is preferable that the pleated compression portion 5 is further provided with a heating mechanism for heating (specifically, heating to about 80 ° C) the filter material blank (not shown). .

In the pleated compression unit 5 (specifically, the pressurizing unit 5b), the power-removing device 6 is disposed at an end portion on the downstream side in the direction in which the filter material A is conveyed (hereinafter also referred to as a downstream end portion). Billet A releases ions. In other words, the static eliminator 6 is configured to emit ions to the crease region of the filter material blank A in a state where the flat plate portions F1b are close to each other (that is, before the pleated region is conveyed to the pleating development portion 7). Further, the static eliminating device 6 is preferably configured to discharge ions to the entire region covering the width direction of the filter material blank A. Moreover, the static eliminating device 6 is configured to discharge ions from one side of the filter material blank A toward the upstream side in the conveying direction of the filter material blank A. The charge amount of the corrugated region of the filter material blank A which is eliminated by the static elimination device 6 is preferably 1.0 kV or less, preferably 0.8 kV or less, more preferably 0.3 kV or less. The static eliminating device 6 is not particularly limited, and for example, (KEYENCE) company made SJ-HA and so on.

The crease region of the filter material blank A compressed by the pleated compression portion 5 is conveyed to the pleating development portion 7. The pleated development portion 7 is configured to convey the crease-like region of the filter material blank A in one direction (corresponding to the direction of one direction of the sheet-shaped filter material blank A, that is, the longitudinal direction). Specifically, the pleated development portion 7 is constituted by an inclined plate 7a which is inclined downward from the downstream side end portion of the lower side plate 5c of the pleated compression portion 5, and is configured to be able to mount the filter material blank A The state of the pleated area. Thereby, the wrinkle-like region of the filter material blank A is conveyed from the pleated compression portion 5 to the pleating development portion 7 so that the crease-like region of the filter material blank A is in one direction on the inclined plate 7a (filter material blank) The length of A is transported. Further, in the pleated development portion 7, the pleated region of the filter material blank A is unfolded from the compressed state, so that the interval between the flat plate portions F1b can be made wider than in the pleated compression portion 5.

The pleated area of the filter material blank A unwound from the pleated development portion 7 is conveyed to the adhesive application portion 3. The adhesive application unit 3 is configured to stretch and expand the wrinkle-like region of the filter material blank A into a state before the pleating process (sheet shape). Specifically, the adhesive application portion 3 is provided with a plurality of pinch rolls, and the pinching rolls apply tension to the wrinkle-like regions of the filter material blank A in one direction (longitudinal direction). Thereby, the wrinkle-like region of the filter material blank A is stretched and developed into a sheet shape. Further, in the region where the filter material blank A is stretched and unrolled, the filter material blank A may be cut into a predetermined width. It should be made so that the cut portion is not subjected to tension.

Further, the adhesive application portion 3 is configured to apply an adhesive to the filter blank A in a state in which the wrinkle region of the filter blank A is stretched and expanded into a sheet shape. Further, the adhesive application portion 3 is configured to relatively convey the filter material blank A in one direction (longitudinal direction) of the filter material blank A. Further, the adhesive application portion 3 is configured to intermittently apply an adhesive along the longitudinal direction (transport direction) of the filter blank A. In addition, the adhesive application unit 3 is configured to apply an adhesive to the filter blank A at a position in the vertical direction (hereinafter, also referred to as an upper and lower transfer position) 3b in the transport direction of the filter blank A.

Further, the adhesive application portion 3 is further provided with an injection nozzle 3a for emitting an adhesive to the filter material blank A. The injection nozzle 3a is disposed at the upper and lower transfer position 3b of the adhesive application unit 3. Further, the injection nozzle 3a is disposed on one side and the other side of the filter material blank A. Further, the injection nozzles 3a are spaced apart in the width direction of the filter material blank A to arrange a plurality of them. Thereby, the adhesive can be applied at a plurality of positions spaced apart in the width direction of the filter material blank A. Further, the adhesive application portion 3 is configured such that the filter material blank A faces the injection nozzle 3a One direction (longitudinal direction) is relatively transported. Thereby, the adhesive is emitted from the front end portion of the injection nozzle 3a (specifically, intermittently emitted), and can be applied to both sides of the filter material blank A in one direction (longitudinal direction) of the filter material blank A. The adhesive is applied in a line shape (specifically, linear and intermittent).

The adhesive applied to the filter blank A in the adhesive application portion 3 is not particularly limited, and for example, a hot melt adhesive (specifically, a thermoplastic resin) can be used. The temperature at which the hot melt adhesive is applied to the filter material blank A varies depending on the composition of the hot melt adhesive, but is preferably, for example, 100 ° C or more and 250 ° C or less, preferably 140 ° C or more and 230 ° C or less.

The adhesive applied to the filter blank A in the adhesive application portion 3 can constitute a fusion fused portion B as shown in Fig. 2 . The fusion fused portions B are formed on both sides of the filter blank A. Further, the fusion trajectory portion B is formed linearly and intermittently in one direction (longitudinal direction) of the filter material blank A.

The fusion trajectory portion (hereinafter also referred to as one of the one side fusion fused portions) B formed on the surface side of one of the filter material blanks A and the fusion trajectory portion formed on the other surface side of the filter material blank A (hereinafter also described The other side side fusion joint portion) B is formed at a plurality of positions of the filter material blank A. Specifically, the one side side fusion fused road portion B and the other surface side fusion fused portion B are formed in plural in the one direction (longitudinal direction) of the filter material blank A. Further, the one side side fusion path portion B and the other surface side fusion side portion B are alternately formed in one direction (longitudinal direction) of the filter material blank A (further, the end portions are overlapped with each other via the filter material blank A) . Further, the one side side fusion path portion B and the other surface side fusion side portion B are formed in plural in the width direction of the filter material blank A (three in the present embodiment).

The one side side fusion channel portion B and the other surface side fusion channel portion B are formed so as to intersect with the region (which is also referred to as a curved region) A3 which is bent when the filter material blank A is pleated (substantially perpendicularly intersects). . Specifically, among the adjacent curved regions A3 and A3, one of the curved regions A3 and one of the side fusion portions B are intersected, and the other curved region A3 and the other surface are fused. Road B intersects. Further, the one side side fusion path portion B and the other surface side fusion side portion B are formed on the side of the mountain side in each of the curved regions A3.

Further, the one side side fusion path portion B and the other surface side fusion side portion B are both sides of a region (hereinafter also referred to as a non-bending region) A4 formed between the adjacent curved regions A3 of the filter material blank A. Specifically, the one side side fusion path portion B and the other surface side fusion side portion B are formed so as to extend from a position intersecting each of the curved regions A3 to a slightly central portion of each of the non-curved regions A4, and are formed so that the ends are formed. They overlap each other at a slight central portion via the filter material blank A.

In the filter medium forming portion 4, the filter material blank A to which the adhesive agent (formed as the fusion trajectory portion B) is applied to the adhesive application portion 3 is bent again in each curved region A3 to form a wrinkle shape. Since the crease characteristics are imparted as described above in each of the curved regions A3, it is easy to bend again, and the filter material blank A is formed into a wrinkle shape. Thereby, each of the non-bending regions A4 can be arranged to face each other. Further, one of the side fusion side bead portions B and B formed in the adjacent non-bending regions A4 and A4 is joined to each other, and the other surface side fusion bead portion B is also joined to each other. Thereby, the filter medium F1 shown in FIG. 3 is formed. The filter medium F1 is provided with a plurality of curved portions F1a formed by bending the filter material blank A, and is provided at the same time. There are a plurality of flat plate portions F1b formed by a region other than the curved portion F1a of the filter material blank A (non-bending region A4). Further, the filter medium F1 is provided with a plurality of space holding portions F1c for maintaining the interval between the adjacent flat plate portions F1b and F1b. The spacer holding portions F1c are formed by joining the one side side fusion fused portions B (or the other other surface side fused portions B) to each other.

Further, in the case where hot melt adhesive is used as the adhesive constituting the fusion fused portion B, when the softening to the extent that the hot melt adhesives can be joined to each other (opening time), the filter blank A is preferably formed into a wrinkle shape. .

In the following description, the direction corresponding to one direction (longitudinal direction) of the filter material blank A in the filter medium F1 is defined as the length L1 of the filter medium F1. Moreover, the interval between the curved portion F1a on the side of the filter material blank A and the curved portion F1a on the other side of the filter material blank A is the height L2 of the filter medium F1.

As shown in FIG. 4, the filter medium F1 formed as described above is provided with a space holding portion F1c which is located on one side and the other side of the filter material blank A, respectively. Further, each of the interval holding portions F1c is formed in a straight line along the height L2 direction of the filter medium F1. Further, each of the interval holding portions F1c on one side and the interval holding portions F1c on the other side of the filter medium F1 are alternately arranged along the length L1 direction of the filter medium F1 (specifically, on a straight line).

The filter medium F1 as described above can be placed in a frame which is configured to accommodate the filter medium F1 to be used as a filter unit. The frame body is provided with an inner space for accommodating the filter medium F1 and a pair of openings communicating with the inner space. Thereby, the casing is configured such that the filtered gas can pass from one opening side to the other opening side.

The shape of the casing is not particularly limited as long as it can accommodate the shape of the filter medium F1, and examples thereof include a rectangular parallelepiped shape and a circular shape. Further, the material of the frame is not particularly limited, and aluminum may be used.

A sealant is filled between the filter medium F1 and the frame. The caulking agent can use, for example, a two-liquid epoxy resin caulk (specifically, The company (Henkel AG & Co. KGaA) manufactured by MACROPLAST 8104MC-18 and MACROPLAST UK5400 in a ratio of 3:1).

Such a filter unit is suitable for use as a HEPA (High Efficiency Particulate Air) filter such as a clean room or a ULPA (Ultra Low Penetration Air) filter.

The filter unit configured as described above is such that the length L1 direction of the filter medium F1 is arranged to intersect with each other in the flow direction of the filtered gas (specifically, substantially perpendicularly intersects). That is, the filter unit is disposed such that the filtered gas contacts the filter medium F1 from the height L2 of the filter medium F1. Thereby, the filtered gas that has flowed into the inside of the filter unit from one of the openings of the casing is discharged through the filter medium F1 in the internal space from the other opening of the casing.

As described above, according to the apparatus for manufacturing a filter medium of the present invention, when the interval between the flat plate portions is widened, the discharge between the adjacent flat plate portions can be prevented, and the formation of the filter material in the filter material can be suppressed. The pores cause a decrease in the dust collecting efficiency of the filter medium.

That is, in the manufacturing apparatus 1, by providing the static eliminating device 6, it is possible to prevent the adjacent flat plates when the pleating development portion 7 widens the interval between the flat plate portions F1b. A discharge occurs between the portions F1b. Specifically, in the end portion on the downstream side in the conveyance direction of the filter material blank A in the pleating and compressing portion 5, a region in which the crepe-like region (hereinafter also referred to as a crease-like region) is formed in the filter material blank A becomes The state in which the flat plate portions F1b are spaced apart from each other. In other words, at the end portion on the downstream side in the conveying direction of the filter material blank A of the pleating and compressing portion 5, the crease-like region of the filter material blank A becomes a charged state, so that the filter medium is removed from the static eliminating device 6 at this end portion. The billet A emits ions, which can pass through the contact between the filter material billet A and the ions, so that the filter material billet A is eliminated from static electricity. Thereby, even when the pleating development portion 7 widens the interval between the flat plate portions F1b, it is possible to prevent the discharge from occurring between the adjacent flat plate portions F1b.

In addition, the wrinkled region of the filter material blank A is conveyed in a state of being sandwiched by the holding portion 5a, and is conveyed while being pressurized by the pressurizing portion 5b, and is slid with the grip portion 5a and the pressurizing portion 5b. It is easy to electrify when in contact. However, since ions are discharged from the static eliminating device 6 to the filter material blank A at the end portion on the downstream side in the conveying direction of the filter material blank A of the pressurizing portion 5b, it is possible to enter the pleating development portion 7 (i.e., adjacent flat plates). In the state where the inter-part F1b does not discharge, the filter material blank A is eliminated from static electricity. Thereby, even when the pleating development portion 7 widens the interval between the flat plate portions F1b, it is possible to prevent the discharge from occurring between the adjacent flat plate portions F1b.

Further, the static eliminating device 6 is configured such that ions are discharged from one surface side of the filter material blank A toward the upstream side in the conveying direction of the filter material blank A, and the ions discharged from the static eliminating device 6 can be efficiently contacted with the filter material blank A. . Thereby, the static elimination of the filter material blank A can be performed efficiently, and when the pleating development portion 7 widens the interval between the flat plate portions F1b, it is possible to further Effectively preventing discharge from occurring between adjacent flat plate portions F1b.

In addition, the apparatus for manufacturing the filter medium of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention. Further, the configuration, method, and the like of the above-described plural embodiments may be used arbitrarily (the configuration and method of one embodiment may be applied to other configurations, methods, and the like), and of course, may be arbitrarily selected. The configurations, methods, and the like of the following various modifications are employed in the configurations, methods, and the like of the above embodiments.

For example, in the above-described embodiment, one of the side fusion side portions B and the other surface side fusion side portion B are formed such that the end portions overlap each other with the filter material blank A therebetween, but it should not be limited thereto or may be formed. The ends are not allowed to overlap each other.

Further, in the above-described embodiment, the filter medium F1 composed of the single-layer porous layer A1 and the pair of base material layers A2 is used, but the filter medium F1 is not limited thereto, and for example, a single sheet may be used. A filter material blank formed by a layer of porous layer A1 and a single layer of substrate layer A2. Alternatively, a filter material blank formed only of the porous layer A1 may be used, or a filter material blank formed by sandwiching the porous layer A1 with the single-layer base material layer A2 may be used.

Further, in the above-described embodiment, the pleating portion 2 is a repetitive method, but it should not be limited thereto, and a configuration in which a plurality of knives are disposed on the outer circumference by transporting the filter blank A may be employed. The filter material blank A is pleated (rotary) between the rolls.

Further, in the above-described embodiment, the filter material blank A which is formed into a long strip shape is used, but it should not be limited thereto. For example, one side may be used. A monolithic filter material blank is formed for the long side.

Further, in order to effectively stretch the filter material blank A on the pleated portion 2, it is preferable to set the pinch roller to have a height difference. Further, in order to prevent the filter material blank A after the pleating process from being charged, it is preferable to humidify the environment in which the pleating process is performed, and to ground the member constituting the manufacturing apparatus 1. Further, in all the steps of the manufacturing apparatus 1, it is preferable that the amount of charge of the filter material blank A is 0.3 kV or less.

Moreover, the adhesive application portion 3 conveys the filter material blank A on which the fusion fused portion B is formed, to the filter medium forming portion 4 via the pinch roller. Therefore, in order to prevent the fusion path portion B from contacting the pinch roller, the filter material blank A on which the fusion path portion B is formed is preferably conveyed to the filter medium forming portion 4 through the pinch roller provided with the groove.

The filter medium F1 formed in the filter medium forming portion 4 can be transported to the filter medium forming portion 4 through a transport mechanism such as a conveyor belt. The conveyance speed of the conveyance mechanism is set to be slower than the conveyance speed of the filter material blank A to the filter medium forming portion 4. Further, it is preferable to determine the interval of the curved filter material blank A in accordance with the ratio of the conveying speed of the conveying mechanism and the conveying speed to the filter forming portion 4 and the amount of the adhesive applied.

Hereinafter, embodiments of the invention will be described. Further, the present invention is not limited to the embodiments described below.

<Example>

1. Production of porous sheets

(1) The PTFE fine powder was a poly freon F-104 (manufactured by Daikin Industries, Ltd.). Further, fluid paraffin was used as a liquid lubricant.

(2) 30 parts by weight of a liquid lubricant is added to 100 parts by weight of the PTFE fine powder to obtain a mixture.

(3) The obtained mixture was pressed by an extrusion method and a rolling method to obtain a sheet-like molded body having a length of 0.2 mm in one direction.

(4) The obtained sheet-like formed body was heated to 200 ° C to remove the liquid lubricant.

(5) Next, the obtained sheet-like molded body was stretched 20 times in the longitudinal direction to be made porous.

(6) Further, the obtained sheet-like molded body was stretched 20 times in the width direction in an environment of 60 ° C to obtain a porous sheet.

(7) The obtained porous sheet has a pressure loss of 50 mmH ₂ O or less, a collection efficiency of 99.9% or more, and a PF value of 22 or more.

2. Production of filter material blank A

Porous sheet and air-permeable sheet obtained by lamination (non-woven fabric) T0403, The company (Unitika Limited.) was simultaneously thermally laminated to obtain a filter material blank A (width: 1200 mm).

3. Filter filter production

According to the manufacturing apparatus 1 of the above-described embodiment, the filter material blank A is pleated, and the characteristics of the crease-like region of the filter material blank A are imparted to the pleated compression portion 5. Specifically, the filter material blank A was successively conveyed at a specific tension, and pleating was performed so that the pleating speed was 70 PLT/min and the height L2 was 35 mm. Further, the heating temperature of the filter material blank A in the pleated compression portion 5 was set to 80 °C. Moreover, the static elimination device 6 is used SJ-HA manufactured by (KEYENCE). Thereafter, an adhesive is applied to the filter material blank A in the adhesive application portion 3, and a filter medium F1 is formed in the filter medium forming portion 4. Further, the charge amount of the wrinkle region of the filter material blank A is measured in the pleating development portion 7. The measurement results are shown in Table 1 below.

4. Evaluation

Each of the filter media F1 obtained in the production apparatus 1 of each of Examples 1 to 6 was stretched and developed into a state before the pleating process to form a sheet shape as a test sample.

Further, the measurement efficiency of each test sample was measured in accordance with the method specified in EN1822-3 (2009). Specifically, the test sample is disposed in the annular holder (effective area: 100cm ^2), the collection efficiency was measured. The measurement conditions are such that the particles containing the poly-α-olefin (PAO) particles (particle diameter: 0.1 μm or more and 0.2 μm or less, number: 10 ⁸ /L or more) are filtered. Permeation flow rate: 5.3 cm/sec) The concentration of PAO particles passing through the test sample was measured by a particle-counter by a test sample. Then, the collection efficiency is calculated by the following formula (1). The collection efficiency of the test filters of the respective examples is shown in Table 1 below.

Collection efficiency (%) = {1 - (particle concentration through the test filter / particle concentration of the filtered gas)} × 100... (1)

<Comparative example>

A porous sheet and a filter material blank A were produced in the same manner as in the examples. Further, a test filter was produced in the same manner as in the example except that the static filter device 6 was not used in the production of the filter medium, and the passed particles were measured using the test filter to calculate the collection efficiency. The collection efficiency at each measurement position is shown in Table 1 below.

<summary>

Referring to Table 1, it can be seen that the capture efficiency of the set of examples has a higher value. This is because, in the embodiment, by using the static eliminating device 6, the flow side end portion can be discharged under the pleated compression portion 5, and ions are released to the creased region of the filter material blank A. Therefore, before the interval between the flat plate portions F1b is widened (that is, before the pleated region is conveyed to the pleating development portion 7), the filter material blank A can be eliminated from static electricity. It has been found that when the interval between the flat plate portions F1b is widened (that is, when the pleated region is conveyed to the pleating development portion 7), discharge between the adjacent flat plate portions F1b is prevented.

Therefore, it has been found that by providing a static eliminating device for discharging ions to the wrinkle-like region of the filter material billet at the downstream end portion of the pleated compressing portion, it is possible to suppress the trapping of the filter medium by the formation of the through-hole by the discharge of the filter material. The efficiency is declining.

1‧‧‧ manufacturing equipment

2‧‧‧pleating processing department

2a‧‧‧ Blade

2L‧‧‧ track

3‧‧‧Adhesive Coating Department

3a‧‧‧jecting nozzle

3b‧‧‧Up and down conveyor

4‧‧‧Filter material forming department

5‧‧‧pleating compression department

5a‧‧‧ Holding Department

5b‧‧‧Pressure

5c‧‧‧ lower side panel

5d‧‧‧Upper side panel

5e‧‧‧Pressure device

6‧‧‧Electrical device

7‧‧‧Pleated expansion

7a‧‧‧ sloping plate

A‧‧‧Filter material

A1‧‧‧Porous layer

A2‧‧‧ substrate layer

F1‧‧‧Filter filter

F1a‧‧‧Bend

F1b‧‧‧ Flat Department

Claims (3)

A filter filter manufacturing apparatus comprising: a pleating processing section, wherein a plurality of bending portions are bent in another direction perpendicularly intersecting one direction in a plurality of positions in one direction of the sheet-shaped filter material to form a plurality of curved portions At the same time, the regions other than the curved portions are arranged to face each other to form a plurality of flat plate portions, and the filter material blank is formed into a wrinkle shape; the pleated compression portion is formed to form a wrinkled region along the filter material blank. One direction of conveyance is compressed in one direction so that the flat plate portions are spaced apart from each other; and the neutralization portion discharges ions to the filter material blank at the end portion of the pleated compression portion on the downstream side in the filter material conveying direction to execute the filter material blank The static elimination and the pleating development portion expand the region of the filter blank which is compressed by the pleated compression portion from the compressed state so that the interval between the flat portions is wider than when the pleated compression portion is formed. The apparatus for manufacturing a filter medium according to claim 1, wherein the pleating compression portion is provided with a holding portion and a pressing portion, and the holding portion forms a wrinkle shape from the double-sided side of the filter material blank a region in which the pressurizing portion is disposed on a downstream side of the filter material blank conveying direction, and is configured to pressurize a region in which the wrinkle-like region is formed in the filter material blank from at least one side of the filter material blank; It is configured to be placed in the pressurizing portion of the filter material The end of the downstream side of the feed direction discharges ions to the filter material blank. The apparatus for producing a filter medium according to claim 1 or 2, wherein the static eliminating unit is configured to discharge ions from one side of the filter material to the upstream side in the conveying direction of the filter material.