WO2014148172A1 - フィルタ濾材およびフィルタ濾材の製造方法 - Google Patents

フィルタ濾材およびフィルタ濾材の製造方法 Download PDF

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Publication number
WO2014148172A1
WO2014148172A1 PCT/JP2014/053626 JP2014053626W WO2014148172A1 WO 2014148172 A1 WO2014148172 A1 WO 2014148172A1 JP 2014053626 W JP2014053626 W JP 2014053626W WO 2014148172 A1 WO2014148172 A1 WO 2014148172A1
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WO
WIPO (PCT)
Prior art keywords
filter medium
original fabric
flat plate
bonding
surface side
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Application number
PCT/JP2014/053626
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English (en)
French (fr)
Japanese (ja)
Inventor
百合 堀江
雅弘 新井
Original Assignee
日東電工株式会社
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Filing date
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Publication of WO2014148172A1 publication Critical patent/WO2014148172A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B01D46/523—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with means for maintaining spacing between the pleats or folds

Definitions

  • the present invention relates to a filter medium that collects particles contained in a gas to be filtered, and in particular, a filter medium that includes a porous layer that collects the particles and a base material layer that is bonded to the porous layer. Related to pleated material.
  • a porous layer for example, made of polytetrafluoroethylene
  • a filter medium original fabric provided with a base material layer (for example, a nonwoven fabric or the like) bonded to at least one surface of the porous layer is pleated.
  • a method of bonding the porous layer and the base material layer for example, a method of thermally laminating the porous layer and the base material layer is known. Specifically, using a base material layer made of a thermoplastic material, heating the porous layer and the base material layer while heating the porous layer and the base material layer, A method is known in which a base layer is heated and laminated with a porous layer (see Patent Documents 1 and 2). In these methods, the porous layer and the base material layer are bonded together by an anchor effect caused by a part of the softened base material layer entering the pores of the porous layer.
  • the present invention provides a filter medium that can suppress a decrease in the air permeability of the porous layer during the production of the filter medium and can reduce pressure loss relatively, and a method for producing the filter medium. Let it be an issue.
  • the filter medium according to the present invention includes a porous layer that collects particles contained in a gas to be filtered and a base material layer that is bonded to at least one surface of the porous layer at a plurality of locations.
  • a filter medium that is bent and formed into a bowl-like shape, wherein the filter medium original fabric is bent along one direction, and a region other than the bent portion of the filter media original is formed in a plate shape And a plurality of spacing holding portions that are formed between each of the flat plate portions on one side and the other side of the filter medium raw material to hold the spacing between adjacent bent portions,
  • the flat plate portion includes a bonding portion where the porous layer and the base material layer are bonded, and a non-bonding portion where the porous layer and the base material layer are not bonded, and one surface side of the filter medium original fabric
  • the gap holding portions formed on the other side of the filter medium original fabric are It forms so that it may overlap via the bonding part in a board part, and it is comprised so that bonding parts may
  • the non-bonding portion by forming the non-bonding portion on the flat plate portion, it is possible to obtain a filter medium having a lower pressure loss than when the bonding portion is formed on the entire flat plate portion.
  • the porous layer and the base material layer are not bonded together, so that part of the base material layer enters the pores of the porous layer and the holes are blocked or porous.
  • the pores of the porous layer are not blocked by the adhesive that bonds the layer and the base material layer. For this reason, the non-bonding part has higher air permeability than the bonding part.
  • the non-bonding part is formed in a flat plate part, and the bonding part is formed in the whole flat plate part.
  • the air permeability of the filter medium is higher than when the filter medium is present.
  • such a filter medium may be used in a state where it is stretched in a direction in which the interval between the flat plate portions is widened (hereinafter also referred to as a stretching direction). It can prevent that a layer and a base material layer isolate
  • an interval holding portion hereinafter also referred to as one surface side interval holding portion
  • An interval holding portion (hereinafter also referred to as the other surface side interval holding portion) formed on the side is separated along the extending direction.
  • the filter medium original fabric forming the flat plate portion is on the one-surface side. While being pulled to one surface side by the interval holding portion, it is pulled to the other surface side by the other surface side interval holding portion. For this reason, in the space
  • the one-surface-side interval holding portion and the other-surface-side interval holding portion are formed so as to overlap with each other through the bonding portion in the flat plate portion, and are configured to adhere the bonding portions to each other.
  • the porous layer and the base material that are located between the one surface side space holding portion and the other surface side space holding portion even when the direction surface space holding portion and the other surface side space holding portion are separated along the stretching direction A pasting state with a layer is maintained by a pasting part. Thereby, it can prevent that a porous layer and a base material layer separate, and it suppresses that a space is formed between a porous layer and a base material layer, and the pressure loss of a filter medium increases. be able to.
  • the said bonding part is formed continuously or intermittently along the direction which cross
  • maintenance part is formed inside the bonding part in each flat plate part.
  • it is preferably formed continuously or intermittently along the direction intersecting the bent portion.
  • maintenance part is 10% or more and 100% or less with respect to the area of a bonding part. Furthermore, it is preferable that the bonding part is formed by heat laminating the porous layer and the base material layer.
  • the method for producing a filter medium according to the present invention is a method for producing a filter medium that forms the filter medium as described above, and includes the bonding part formed in a region to be the flat plate part in the filter medium original fabric.
  • the adhesive is disposed on both sides of the filter medium original so as to overlap, and then the filter medium original is bent into a bowl shape to form a plurality of bent portions and a plurality of flat plate portions, and one side of the filter medium original and Between the flat plate portions on the other surface side, the adhesives on one side of the filter medium and the adhesives on the other side are joined together, and the raw material of the filter medium is overlapped via the bonding part.
  • Space holding portions are formed on one surface side and the other surface side.
  • the filter medium 1 is formed into a bowl shape by bending a filter medium original fabric 2 that collects particles contained in a gas to be filtered at a plurality of locations (hereinafter also referred to as pleating). ).
  • the filter medium 1 includes a plurality of bent portions 1a formed by bending the filter medium original fabric 2 along one direction, and a plurality of flat plate portions 1b formed by forming a region other than the bent portion 1a into a plate shape.
  • the interval holding unit 3 is disposed between a pair of opposed surfaces (hereinafter, also referred to as filter material facing surfaces) 1c, 1c in the adjacent flat plate portions 1b, 1b, and is bonded to the filter material facing surfaces 1c, 1c. .
  • the adjacent flat plate portions 1 b and 1 b (specifically, the pair of filter medium facing surfaces 1 c and 1 c) are connected via the gap holding portion 3.
  • maintenance part 3 is formed by connecting bead parts 3a and 3a by which an adhesive agent is apply
  • a bead portion 3a is formed by linearly applying an adhesive so as to cross the mountain side surface of each bent portion 1a.
  • maintenance part 3 is formed by connecting the site
  • an adhesive agent which comprises the bead part 3a For example, a hot melt can be used.
  • the thickness of the bead portion 3a can be appropriately set according to the desired interval between the bent portions 1a.
  • a plurality (three in this embodiment) of the interval holding portions 3 are formed at intervals in the extending direction (longitudinal direction) of each bent portion 1a.
  • the other bent portion 1a is formed so as to correspond to each of the bead portions 3a that are formed in a plurality in a distance in the longitudinal direction of one bent portion 1a.
  • a plurality of bead portions 3a are formed at intervals in the longitudinal direction. And the adjacent bead parts 3a and 3a are connected, The some space
  • the filter medium original fabric 2 is formed so that the other direction orthogonal to one direction is the longitudinal direction before being pleated. Further, the filter medium original fabric 2 may be configured to be formed into a sheet by being unwound from a state in which the filter medium is formed and wound, and is formed into a sheet having a predetermined length. It may be.
  • the raw filter medium 2 includes a porous layer 2a that collects particles contained in the gas to be filtered, and a base layer 2b that has air permeability and is laminated on at least one surface of the porous layer 2a. Is provided. In this embodiment, the base material layer 2b is bonded to one surface of the porous layer 2a to form the filter medium original fabric 2.
  • the porous layer 2a is formed using a porous sheet material (hereinafter also referred to as a porous sheet) capable of collecting the particles.
  • a porous sheet material hereinafter also referred to as a porous sheet
  • the porous sheet is not particularly limited, and can be appropriately selected depending on the use of the filter medium 1.
  • a PTFE sheet in which polytetrafluoroethylene (PTFE) is formed in a sheet shape can be used.
  • PTFE sheet polytetrafluoroethylene
  • the following method can be employed as a method for forming the PTFE sheet.
  • a liquid lubricant is added to the PTFE fine powder to form a paste-like mixture.
  • the liquid lubricant is not particularly limited as long as it can impart appropriate wettability to the surface of the mixture, and is particularly preferable if it can be removed by extraction treatment or heat treatment.
  • hydrocarbons such as liquid paraffin, naphtha and white oil are used as the liquid lubricant.
  • the addition amount of the liquid lubricant is not particularly limited, and for example, it is preferably 5 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the PTFE fine powder.
  • the mixture is preformed to form a preform.
  • the preforming is preferably performed at a pressure that does not separate the liquid lubricant from the mixture.
  • the obtained preform is formed into a sheet by extrusion or rolling.
  • the obtained molded body is made uniaxially stretched or biaxially stretched to make a porous body, thereby obtaining a PTFE sheet.
  • stretching conditions For example, it is preferable that each draw ratio is 1.5 times or more and 200 times or less in the temperature environment of 30 degreeC or more and 400 degrees C or less.
  • the base layer 2b is formed using a breathable sheet material (hereinafter also referred to as a breathable sheet).
  • a breathable sheet is not particularly limited, and for example, a nonwoven fabric, a woven fabric, a net, or the like can be used.
  • a breathable sheet made of a thermoplastic material.
  • synthetic fibers such as polyolefin (polyethylene, polypropylene, etc.), polyamide, polyester, aromatic polyamide, acrylic, polyimide, and composite materials thereof can be used.
  • the breathable sheet is composed of one component, the entire breathable sheet may melt and the form of the base material layer 2b may not be maintained. It is preferable to use a conductive sheet.
  • a PET / PE core-sheath fiber, a PP / PE blended nonwoven fabric, or the like can be used as the breathable sheet.
  • the filter medium original fabric 2 is formed by partially bonding the porous layer 2a and the base material layer 2b.
  • the filter medium raw fabric 2 includes a bonding part 2c formed by bonding a part of the porous layer 2a and a part of the base material layer 2b, and a region other than the bonding part 2c ( That is, the non-bonding part 2d which consists of the area
  • region A1 are formed along the longitudinal direction of the filter-medium original fabric 2 (in this embodiment, it is strip
  • region A1 are continuously formed over the substantially full length of the longitudinal direction of the filter-medium original fabric 2. As shown in FIG. Moreover, the bonding part 2c and bonding area
  • region A1 are formed in multiple numbers (this embodiment three) at intervals along the width direction of the filter-medium original fabric 2. As shown in FIG.
  • region A1 are along the direction which cross
  • region region (henceforth a bending plan area
  • the non-bonding part 2d is formed between the bonding parts 2c and between the both end parts in the width direction of the filter medium raw fabric 2 and the bonding part 2c.
  • the non-bonding part 2d is formed along the longitudinal direction of the filter medium original fabric 2 (in the present embodiment, in a band shape). Furthermore, the non-bonding part 2d is continuously formed over substantially the entire length of the filter medium original fabric 2 in the longitudinal direction. In this non-bonding part 2d, it laminates
  • the method of forming the filter medium raw fabric 2 as described above is not particularly limited, and for example, between the porous sheet that forms the porous layer 2a and the breathable sheet that forms the base material layer 2b. It is possible to employ a method in which a hot melt or pressure sensitive adhesive is disposed on the porous sheet and the porous sheet and the breathable sheet are pressure-bonded. Alternatively, it is possible to employ a method in which the breathable sheet is heated and softened and pressure-bonded to the porous sheet (in other words, heat lamination).
  • the method for pressure-bonding the porous sheet and the air permeable sheet is not particularly limited, and for example, while laminating the porous sheet and the air permeable sheet between a pair of roller members (not shown). It is possible to adopt a method of conveying and continuously pressing the porous sheet and the breathable sheet. Alternatively, it is also possible to employ a method in which a sheet-like porous sheet and a breathable sheet are laminated between a pair of plates (not shown) and are intermittently pressure-bonded for each sheet. it can.
  • a heating roller whose surface temperature is set to a melting point temperature of the breathable sheet, a support roller that supports the porous sheet and the breathable sheet from below in a laminated state, A pair of roller members consisting of Then, the porous sheet and the breathable sheet are thermally laminated, so that the breathable sheet is softened and enters the pores of the porous sheet, and the porous sheet and the breathable sheet are bonded and pasted by the anchor effect. Joint part 2c and bonding area
  • region A1 are formed.
  • region A1 in strip shape along the longitudinal direction of the filter-medium original fabric 2 For example, along the rotation direction on the surface of a heat roller.
  • a convex part can be provided, and a porous sheet and a breathable sheet can be pressure-bonded between the convex part and the other roller member.
  • a breathable sheet softens and a porous sheet and a breathable sheet are heat-laminated.
  • the bonding portion 2c and the bonding region A1 are formed in a band shape, and the non-bonding portion 2d is formed in a band shape.
  • the filter medium original fabric 2 is pleated. Specifically, the filter medium original fabric 2 is bent at a plurality of locations (that is, the respective planned bending regions A2) along the width direction orthogonal to the longitudinal direction, and is formed into a bowl shape. Thereby, a plurality of bent portions 1 a and a plurality of flat plate portions 1 b in the filter medium 1 are formed on the filter medium original fabric 2.
  • an adhesive is applied to both sides of the filter medium original fabric 2 to form bead portions 3a.
  • an adhesive is applied to both sides of the filter medium original fabric 2 while the bead portion 3a is formed while the filter medium original fabric 2 formed in a bowl shape is stretched into a flat state before pleating.
  • the bead portion 3 a is formed inside the bonding portion 2 c of the filter medium original fabric 2.
  • each of the bead portions (hereinafter also referred to as one surface side bead portion and the other surface side bead portion) 3a formed on one surface side and the other surface side of the filter medium original fabric 2 is the length of the filter media original fabric 2 A plurality are formed at intervals along the direction, and a plurality (three in the present embodiment) are formed at intervals along the width direction of the filter medium original fabric 2. Further, the one surface side bead portion 3 a and the other surface side bead portion 3 a are formed on substantially the same straight line along the longitudinal direction of the filter medium original fabric 2.
  • the shape of the bead portion 3a is not particularly limited, and in the present embodiment, the bead portion 3a is formed in a linear shape along the longitudinal direction of the filter medium original fabric 2. Moreover, the bead part 3a is formed in the vicinity of the surface which becomes a mountain side when the bending part 1a in the bending expected area A2 is formed. Specifically, the bead portion 3 a is formed so as to intersect the planned bending region A ⁇ b> 2 in the filter medium original fabric 2. In this embodiment, it is comprised so that bead part 3a and the bending plan area
  • the bead part 3a is formed on the surface which becomes a mountain side when the bending part 1a is formed. That is, of the adjacent planned bending regions A2 and A2, one of the planned bending regions A2 and the one surface side bead portion 3a intersect, and the other bending target region A2 and the other surface side bead portion 3a intersect. Configured.
  • the length from the intersecting position of the bead portion 3a and the planned bending area A2 to the end portion of the bead portion 3a is not particularly limited, but the bead coating length ratio is a length exceeding 50%. It is preferable.
  • the bead application length ratio refers to the ratio of the length from the intersection between the bead portion 3a and the planned bending region A2 to the one end portion of the bead portion 3a with respect to the distance between the adjacent bending planned regions A2 and A2.
  • the bead portion 3a has a central portion of an area A3 between the planned bending areas A2 and A2 adjacent to the bending position A2 (that is, the flat plate section 1b) (hereinafter, the flat plate section planned area) A3.
  • regions A2 and A2 is the distance which tied the center part of one bending plan area
  • the one-side bead portion 3a and the other-side bead portion 3a are formed so as to overlap with each other through the filter medium original fabric 2 (specifically, the flat plate portion planned region A3). More specifically, one of the one surface side bead portion 3a and the other surface side bead portion 3a that intersects each of the adjacent bending planned regions A2 and A2 is formed on the same straight line along the longitudinal direction of the filter medium raw fabric 2. They are formed so as to overlap each other through the filter medium original fabric 2 in the planned flat plate region A3. Further, the one surface side bead portion 3a and the other surface side bead portion 3a are formed such that ends located inside the flat plate portion planned region A3 are overlapped with each other through the filter medium original fabric 2.
  • the overlapping position of the one surface side bead portion 3a and the other surface side bead portion 3a in the flat plate portion planned region A3 is not particularly limited, but is substantially the direction along the longitudinal direction of the filter medium original fabric 2 It is preferable that it is a center part.
  • the one-side bead portion 3a and the other-side bead portion 3a are formed in the region where the one-side bead portion 3a and the other-side bead portion 3a overlap each other.
  • the bonding part 2c of the filter medium raw fabric 2 is located between 3a and the other surface side bead part 3a.
  • the one surface side bead portion 3a and the other surface side bead portion 3a are formed so as to overlap with each other through the bonding portion 2c of the filter medium original fabric 2.
  • the adhesive constituting the bead portion 3a is not particularly limited, and for example, hot melt can be used.
  • the temperature at which the hot melt is applied to the filter medium original fabric 2 varies depending on the components of the hot melt, but is preferably 100 ° C. or higher and 250 ° C. or lower, and more preferably 140 ° C. or higher and 230 ° C. or lower. .
  • the filter medium original fabric 2 on which the bead portion 3a is formed as described above is bent again at each of the planned bending regions A2 to form a bowl shape.
  • a plurality of bent portions 1a and a plurality of flat plate portions 1b are formed, and the portions located between the flat plate portions 1b in each bead portion 3a are joined to each other.
  • the holding part 3 is formed and becomes the filter medium 1.
  • the filter medium raw fabric 2 is again made into a bowl-like shape. It is preferable to form.
  • a direction corresponding to the longitudinal direction of the filter medium original fabric 2 in the filter medium 1 is defined as a length L1 of the filter medium 1.
  • a direction corresponding to the width direction of the filter medium original fabric 2 in the filter medium 1 is defined as a width L2 of the filter medium 1.
  • interval between the bending part 1a formed so that one surface side of the filter-medium original fabric 2 may become a peak side, and the bending part 1a formed so that the other surface side of the filter-medium original fabric 2 may become a peak side may be set.
  • the height of the filter medium 1 is L3.
  • each interval holding unit 3 is formed in a straight line shape from one side in the height L3 direction of the filter medium 1 toward the other side.
  • each space holding portion 3 (hereinafter also referred to as one surface side space holding portion 3) on one surface side of the filter medium 1 and each space holding portion 3 (hereinafter referred to as the other surface side space holding portion 3) on the other surface side.
  • the other surface side space holding portion 3 is also arranged alternately along the length L1 direction of the filter medium 1 (specifically, linearly along the length direction).
  • maintenance part 3 are formed so that it may overlap via the flat plate part 1b (specifically bonding part 2c).
  • the edge parts located in the center side of the flat plate part 1b are flat plate parts 1b (specifically bonding part 2c).
  • maintenance part 3 are the approximate center part of the height L3 direction of the filter medium 1, and pass the flat plate part 1b (specifically, the bonding part 2c). Configured to overlap.
  • the length from the connecting position between the bent portion 1a and the flat plate portion 1b to one end portion of each spacing holding portion 3 is the length between the connecting positions between the pair of bent portions 1a and 1a in the flat plate portion 1b.
  • the one-surface-side interval holding portion 3 and the other-surface-side interval holding portion 3 are configured to overlap each other at a substantially central portion in the height L3 direction of the filter medium 1. .
  • a site (hereinafter also referred to as an interval holding portion superposition portion) B1 is formed.
  • the interval holding portion overlapping portion B1 is formed at a substantially central portion of the filter medium 1 in the height L3 direction.
  • a plurality (specifically, three) of the interval holding portion overlapping portions B1 are formed at intervals in the width L2 direction of the filter medium 1. Between the interval holding portion overlapping portions B1 in the width L2 direction of the filter medium 1, the interval holding portion 3 is not formed, and a space is formed between the flat plate portions 1b.
  • the filter medium 1 having the above-described configuration may be used so that the flat plate portion 1b intersects the flow direction of the gas to be filtered, and the height L3 direction is along the flow direction of the gas to be filtered. It may be arranged and used.
  • the gas to be filtered mainly passes through the flat plate portion 1b (specifically, the non-bonding portion 2d in the flat plate portion 1b).
  • the filter medium 1 having the above-described configuration is used in a state in which the outer shape (the shape viewed from the height L3 direction) is formed in a predetermined shape and then housed in a frame (not shown). May be.
  • the shape of the frame is not particularly limited as long as the filter medium 1 can be accommodated.
  • the frame has a rectangular parallelepiped shape having an inner dimension of 1180 mm ⁇ 1180 mm, an outer dimension of 1220 mm ⁇ 1220 mm, and a thickness of 75 mm, The circular thing etc. which have an internal diameter are mentioned.
  • the material of the frame is not particularly limited, and aluminum can be used.
  • a caulking agent is filled between the filter medium 1 and the frame.
  • a two-component epoxy caulking agent specifically, a mixture of Macroplast 8104MC-18 manufactured by Henkel and Macroplast UK5400 at a ratio of 3: 1 can be used.
  • the filter medium and the method for producing the same according to the present invention it is possible to suppress a decrease in the air permeability of the porous layer during the production of the filter medium and to relatively reduce the pressure loss.
  • the filter medium 1 can prevent relative displacement between the porous layer 2a and the base material layer 2b when the original filter medium 2 is pleated. Specifically, when the filter medium original fabric 2 is pleated, the direction in which the porous layer 2a and the base material layer 2b are displaced relative to the planned bending area A2 of the filter media original fabric 2 is provided. Specifically, a force is applied to the direction along the facing surfaces of the porous layer 2a and the base material layer 2b.
  • the relative positional relationship between the porous layer 2a and the base material layer 2b is fixed in the planned bending region A2 by intersecting the planned bending region A2 and the bonding portion 2c. For this reason, even when a force that causes a relative positional deviation between the porous layer 2a and the base material layer 2b is applied to the planned bending region A2 when performing pleating, the porous layer 2a and the base material layer It is possible to prevent the relative displacement of 2b.
  • the filter medium 1 having a lower pressure loss can be obtained than when the bonding part 2c is formed on the entire flat plate part 1b.
  • the non-bonding part 2d since the porous layer 2a and the base material layer 2b are not bonded, a part of the base material layer 2b enters the hole of the porous layer 2a and the hole is blocked. The pores of the porous layer 2a are not blocked by the adhesive that bonds the porous layer 2a and the base material layer 2b. For this reason, the non-bonding part 2d has higher air permeability than the bonding part 2c.
  • the bonding part is formed in the whole flat plate part 1b because the non-bonding part 2d is formed in the flat plate part 1b.
  • the air permeability of the filter medium is higher than when 2c is formed.
  • the filter medium 1 with a low pressure loss can be obtained by providing the non-bonding part 2d in the flat plate part 1b. The measurement of pressure loss is performed using a Manostar gauge (minimum scale: 1.0 Pa) or an electric fine differential pressure gauge (accuracy: 1.0 Pa).
  • the filter medium 1 is stretched during handling or used in a stretched direction in a direction in which the distance between the flat plate portions 1 b is widened (hereinafter also referred to as a stretching direction).
  • the porous layer 2a and the base material layer 2b can be prevented from being partially separated.
  • the one-surface-side interval holding portion 3 and the other-surface-side interval holding portion 3 are arranged along the extending direction (specifically, the one-surface-side interval holding portion). 3 is separated in the X direction, and the other surface side interval holding portion 3 is separated in the Y direction).
  • the filter medium original fabric 2 forming the flat plate part 1b is pulled in the X direction by the one surface side gap holding part 3 and is pulled in the Y direction by the other face side gap holding part 3. It will be. For this reason, in the space
  • the one-surface-side interval holding portion 3 and the other-surface-side interval holding portion 3 are formed so as to overlap with each other via the bonding portion 2c in the flat plate portion 1b, and the bonding portions 2c are bonded to each other.
  • the one-surface-side interval holding portion 3 and the other-surface-side interval holding portion 3 are separated along the stretching direction, the one-surface-side interval holding portion 3 and the other-surface-side interval holding portion 3
  • the bonding state of the porous layer 2a and the base material layer 2b located in the position is maintained by the bonding portion 2c.
  • the porous layer 2a and the base material layer 2b can be prevented from being separated from each other, and a space is formed between the porous layer 2a and the base material layer 2b to increase the pressure loss of the filter medium 1. Can be suppressed.
  • the filter medium and the manufacturing method thereof according to the present invention are not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.
  • the configurations and methods of the plurality of embodiments described above may be arbitrarily adopted and combined (even if the configurations and methods according to one embodiment are applied to the configurations and methods according to other embodiments).
  • the bonding part 2c is continuously formed over the whole region of the longitudinal direction of the filter-medium original fabric 2, it is not limited to this,
  • the bonding part 2e may be intermittently formed along the longitudinal direction of the filter medium raw fabric 2.
  • the bonding portion 2e is formed inside the planned flat plate region A3 without intersecting with the planned bending region A2 of the filter medium original fabric 2.
  • the one side bead part 3a and the other side bead part 3a are formed inside the bonding part 2e.
  • the filter-medium original fabric 2 is bent in multiple places along the width direction, it is not limited to this,
  • the center part of the filter-medium original fabric formed in the sheet body shape is A conical filter medium may be formed by being bent radially at a plurality of locations.
  • the filter medium 1 is comprised using the filter medium raw fabric 2 which consists of the porous layer 2a and the base material layer 2b, it is not limited to this,
  • a porous layer The filter medium may be configured using a filter medium original fabric in which the base material layer 2b is bonded to both surfaces of 2a.
  • a filter medium may be comprised using the filter medium raw fabric by which the porous layer 2a is bonded together on both surfaces of the base material layer 2b.
  • the one surface side bead part 3a and the other surface side bead part 3a are formed in multiple numbers at intervals along the longitudinal direction of the filter-medium original fabric 2, it is not limited to this. Instead, it may be formed continuously (that is, linearly) along the longitudinal direction of the filter medium raw fabric 2.
  • Example 1 Porous sheet A PTFE sheet was used as the porous sheet. Specifically, 19 parts by weight of a liquid lubricant (normal decane) was added to 100 parts by weight of PTFE fine powder (trade name: F104, manufactured by Daikin Industries, Ltd.) to obtain a paste-like mixture. And after preforming this mixture, it extrude-molded and the flat molded object from which an extrusion direction becomes a length was obtained. Then, this flat molded object was rolled so that thickness might be set to 0.4 mm. And in order to remove a liquid lubricant from a flat molded object, this molded object was heated at 150 degreeC in the drying furnace. Thereafter, the flat molded body was stretched 15 times along the longitudinal direction in an environment of 280 ° C., and stretched 15 times along the width direction orthogonal to the longitudinal direction in an environment of 100 ° C. Got.
  • a liquid lubricant normal decane
  • PTFE fine powder trade name: F104, manufactured by Daikin Industries
  • Breathable sheet A long PET / PE core-sheath nonwoven fabric (trade name: T1003WDO manufactured by Unitika Ltd.) was used as the breathable sheet.
  • the bonding portion 2c is formed integrally and in a strip shape over substantially the entire length of the filter medium original fabric 2 in the longitudinal direction.
  • variety of the bonding part 2c was 1 cm, and the space
  • the thickness of the bonding part 2c was 0.32 mm, and the thickness of the non-bonding part 2d was 0.45 mm.
  • the ratio (lamination ratio) of the total area of the bonding part 2c with respect to the area of the filter-medium original fabric 2 was 20%.
  • each roller member that whose outer diameter (diameter from an axial center to the front-end
  • a bead portion 3a is formed as shown in FIG. Specifically, a plurality of bead portions 3a are formed along the longitudinal direction of the filter medium original fabric 2 inside each bonding portion 2c, and each bead portion 3a is formed so as to intersect the planned bending region A2. Is done. Further, the one surface side bead portion 3a and the other surface side bead portion 3a are formed so as to overlap with each other via the flat plate portion 1b. Specifically, it forms so that the edge part of the one surface side bead part 3a and the edge part of the other surface side bead part 3a may overlap via the bonding part 2c in the flat plate part 1b.
  • FIG. 1 A filter medium 1 as shown in FIG.
  • Macromelt 6202 polyamide type manufactured by Henkel Corporation was used.
  • the filter media 1 is housed inside a frame (aluminum frame with inner dimensions of 1180 mm x 1180 mm, outer dimensions of 1220 mm x 1220 mm, thickness of 75 mm), and a frame using a two-pack epoxy caulking material. The gap between the body and the filter medium 1 was sealed to produce a filter unit.
  • a two-pack epoxy caulking material a mixture of Henkel macroplast 8104MC-18 and macroplast UK5400 at a ratio of 3: 1 was used. And the collection efficiency was measured using this filter unit. The measurement results are shown in Table 1 below.
  • the collection efficiency is measured by allowing a gas containing 10 7 pieces / L or more of PAO (poly- ⁇ -olefin) as collected particles to pass through the filter unit (specifically, between the flat plate portions 1b of the filter medium 1). It was. And the PAO density
  • the surface speed was 0.4 ⁇ 0.1 m / sec, and the downstream probe speed was 22 mm / sec.
  • the filter unit is manufactured as described above by using the filter medium 1 in which the operation of bending until the both end portions in the length L1 direction are in contact (the operation of applying a force to the filter medium in the extending direction) is repeated 10 times. Then, the collection efficiency was measured. The measurement results are shown in Table 1 below.
  • Example 1 In the same manner as in Example 1, except that the filter medium original fabric was heat-laminated so that the laminate ratio was 100% (in other words, the non-bonding part 2d was not formed) when the filter medium original fabric was formed.
  • the filter was made to form a filter medium. And the calculation of the pressure loss increase rate and the measurement of the collection efficiency were performed like Example 1 using the obtained filter medium.
  • Example 1 has a lower pressure loss. This is because, as in Example 1, the laminating ratio is less than 100%, so that the filter part 1 is formed with the bonding part 2c and the non-bonding part 2d. And in the non-bonding part 2d, it is not obstruct
  • Example 1 maintains the collection efficiency even after the bending operation. This is because, when a force in the stretching direction is applied to the filter medium 1 (when a bending operation is applied), the one-surface-side interval holding portion 3 and the other-surface-side interval holding portion 3 overlap each other via the flat plate portion 1b (interval holding). A force is applied to the partial polymerization portion B1 so as to peel off the porous layer 2a and the base material layer 2b constituting the filter medium raw fabric 2.
  • the bonding part 2c is formed inside the bonding part 2c like Example 1, the one surface side space
  • maintenance part 3 will overlap via the bonding part 2c. Formed as follows. That is, since the bonding part 2c is formed in the space

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
PCT/JP2014/053626 2013-03-21 2014-02-17 フィルタ濾材およびフィルタ濾材の製造方法 WO2014148172A1 (ja)

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JP6106479B2 (ja) * 2013-03-21 2017-03-29 日東電工株式会社 フィルタ濾材およびフィルタ濾材の製造方法
TWI766104B (zh) * 2017-09-22 2022-06-01 日商日東電工股份有限公司 空氣過濾器濾材、過濾器褶襉組及空氣過濾器單元
US10918976B2 (en) * 2018-10-24 2021-02-16 Pall Corporation Support and drainage material, filter, and method of use

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JPH06178905A (ja) * 1992-12-11 1994-06-28 Miki Rubber Kk フィルターの濾材補強構造
JP2000107526A (ja) * 1998-10-01 2000-04-18 Daikin Ind Ltd エアフィルターパックおよびエアフィルター
JP2003265910A (ja) * 2002-01-09 2003-09-24 Nippon Air Filter Kk フィルタエレメントの製造装置
JP2005266004A (ja) * 2004-03-16 2005-09-29 Nitto Denko Corp トナー容器用通気フィルタ、通気部材、それらを用いたトナー容器、およびトナー容器用通気フィルタ集合体

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JP6106479B2 (ja) 2017-03-29
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CN104056491A (zh) 2014-09-24
TWI633920B (zh) 2018-09-01
TW201440871A (zh) 2014-11-01

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