Powder sealing material

Abstract

To provide a powder seal material capable of suppressing leakage of powder to outside.SOLUTION: A powder seal material consists of a plurality of pile yarns raised on a base cloth obtained by weaving a plurality of warp and weft extending in directions crossing each other. The warp is woven so as to cross over the weft and appear on a front side of the base cloth at an area at which the warp contacts a pile yarn woven into the weft in a weft direction, and the warp appears on the front side of the base cloth without being woven at least into weft into which the pile yarn is woven and weft adjacent to the weft.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a powder sealing material. [Background technology]

[0002] A cleaning material for fine powder particles is known (Patent Document 1), which comprises a base fabric formed from a knitted fabric obtained by warp knitting ground yarn and attached to a support facing a moving body that comes into contact with the fine powder particles, and pile yarns that are raised on the base fabric and come into sliding contact with the moving body to scrape off the fine powder particles adhering to the surface, thereby cleaning the moving body surface.

[0003] A sealing material that seals a predetermined gap between a movable body that contacts fine powder and a housing of the movable body by adhering to the movable body or the housing surface to prevent leakage of the powder without impeding the movement of the movable body, is mainly made of pile fabric composed of pile yarns that become the sliding feathers and a plain weave ground fabric that supports them, the pile yarns of the feathers are synthetic resin fibers with a single yarn fineness of 6 denier or more, low friction coefficient and abrasion resistance, the feather height is 1.5 mm or more, and the feather standing density is 40,000 feathers / in. 2 As described above, a sealing material for preventing leakage of fine powder particles is also known, which has a coating layer on the back surface of the base fabric to prevent feathers from falling out and further has pile yarns that are flattened in a certain direction by heating (Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-141263 A [Patent Document 2] JP 2005-37955 A Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a powder sealing material capable of suppressing leakage of powder to the outside. [Means for solving the problem]

[0006] In order to solve the above problem, the powder sealing material according to claim 1 comprises: A powder sealing member comprising a plurality of pile yarns raised on a base fabric obtained by weaving a plurality of warp yarns and weft yarns extending in mutually intersecting directions, The warp threads teeth , the pile yarn of The weft direction The pile yarn is wound from both sides of the contact The pile yarn is woven into the weft yarn and both sides of the weft yarn. The weft is woven across the weft yarn so as to be exposed on the front side of the base fabric. and a second warp yarn spaced apart from the first warp yarn and woven into the weft yarn from the weft direction without contacting the pile yarn. , It is characterized by:

[0009] Claim 2 The present invention relates to a powder sealing material according to claim 1, The above 1. The warp threads are Second Thicker than the warp threads, It is characterized by:

[0010] Claim 3 The invention described in claim 1 or 2 In the powder sealing material described in The pile yarn is a synthetic resin fiber having a single yarn fineness of 3 to 15 denier and a fineness of 150 denier or more and 1000 denier or less, which has a low friction coefficient and abrasion resistance. It is characterized by:

[0011] Claim 4 The invention described in claims 1 to 3 In the powder sealing material according to any one of claims 1 to 5, The pile yarns are tilted in a direction parallel to the warp yarns. It is characterized by: Effect of the Invention

[0012] According to the invention described in claim 1, compared to a case not having this configuration, By reducing the gap in the weft direction at the base of the pile yarn It is possible to suppress leakage of powder to the outside.

[0015] Claim 2 According to the invention described in the above, gaps in the weft direction at the pile yarn base can be reduced compared to a case not having this configuration.

[0016] Claim 3 According to the invention described in the above, the yarn density per unit can be increased compared to a case not having this configuration.

[0017] Claim 4 According to the invention described in the above, the intrusion of powder into the sliding contact portion can be suppressed compared to a case not having this configuration. [Brief description of the drawings]

[0018] [Figure 1] 2 is a simplified oblique view showing the weaving structure of the base fabric of the powder sealing material and the standing state of each pile on the base fabric. FIG. [Diagram 2] FIG. 2A is an enlarged schematic cross-sectional view of the powder sealing material, and FIG. 2B is a simplified plan view showing the weaving structure of the base fabric of the powder sealing material and the arrangement of each pile on the base fabric. [Diagram 3] 1A is an enlarged schematic cross-sectional view of a powder sealing material according to modified example 1, and FIG. 1B is a simplified plan view showing the weaving structure of the base fabric of the powder sealing material according to modified example 1 and the arrangement of each pile on the base fabric. [Figure 4] 1A is an enlarged schematic cross-sectional view of a powder sealing material according to modified example 2, and FIG. 1B is a simplified plan view showing the weaving structure of the base fabric of the powder sealing material according to modified example 2 and the arrangement of each pile on the base fabric. [Diagram 5] FIG. 1A is an enlarged schematic cross-sectional view of the powder sealing material after being toppled, and FIG. 1B is a schematic diagram illustrating the toppling process using a heat roller. [Figure 6]FIG. 1A is a schematic diagram illustrating the arrangement of warp threads relative to pile threads and the penetration of toner in a powder sealing material according to the present embodiment, and FIG. 1B is a schematic diagram illustrating the arrangement of warp threads relative to pile threads and the penetration of toner in a powder sealing material of a comparative example. [Figure 7] FIG. 2A is a schematic cross-sectional view of a developing device of an image forming apparatus that forms an image using toner, and FIG. 2B is a schematic view illustrating the powder sealing function of a powder sealing material. [Figure 8] 1A is an enlarged cross-sectional photograph of the powder sealing material of the embodiment, and FIG. 1B is an enlarged cross-sectional photograph of the powder sealing material of the comparative example. [Figure 9] A simplified oblique view showing the weaving structure of the base fabric of the powder sealing material of the comparative example and the standing state of each pile on the base fabric. [Figure 10] 1A is an enlarged schematic cross-sectional view of a powder sealing material according to a comparative example, and FIG. 1B is a simplified plan view showing the weaving structure of the base fabric of the powder sealing material according to the comparative example and the arrangement of each pile on the base fabric. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The present invention will be described in more detail below with reference to the drawings, showing embodiments and specific examples, but the present invention is not limited to these embodiments and specific examples. In addition, in the following explanation using the drawings, it should be noted that the drawings are schematic and the ratios of the dimensions, etc. may differ from the actual ones, and in order to make it easier to understand, illustrations other than those of parts necessary for the explanation have been omitted as appropriate.

[0020] (1) Composition of powder sealant Figure 1 is a simplified oblique view showing the weaving structure of the base fabric 10 of the powder sealing material 1 and the arrangement of each pile yarn 20 on the base fabric 10, Figure 2(a) is an enlarged schematic cross-sectional view of the powder sealing material 1, and (b) is a simplified plan view showing the weaving structure of the base fabric 10 of the powder sealing material 1 and the arrangement of each pile yarn 20 on the base fabric 10. The configuration and function of the powder sealing material 1 according to this embodiment will be described below with reference to the drawings.

[0021] (1.1) Overall structure of powder sealant The powder sealing material 1 is composed of a plurality of pile yarns 20 raised on a base fabric 10 obtained by weaving a plurality of warp yarns 11 and weft yarns 12 extending in mutually intersecting directions, and as shown in Fig. 1, the warp yarns 11 are woven so as to straddle the weft yarns 12 and appear on the front side 10a of the base fabric 10 in a region (indicated by R in Fig. 1) where the warp yarns 11 contact the pile yarns 20 woven into the weft yarns 12 in a substantially U-shaped manner in the direction of the weft yarns 12. In addition, in the simplified perspective view of Fig. 1, the warp yarns 11 and the weft yarns 12 are shown with a gap between them in order to make the weave structure of the base fabric 10 easier to understand.

[0022] 2(a), the powder sealing material 1 has a coating layer 13 made of a synthetic resin coating agent provided on the back surface of a base fabric 10, and the coating layer 13 firmly bonds the base fabric 10 to the base fabric 10. An attachment layer 30 is provided on the back surface of the coating layer 13, and this attachment layer 30 allows the powder sealing material 1 to be attached to, for example, an image forming device that uses powder.

[0023] (1.2) Base fabric The base fabric 10 is a woven fabric obtained by weaving a plurality of warp threads 11 and weft threads 12 that extend in directions intersecting each other. The warp threads 11 and weft threads 12 are made of highly durable and flexible yarns, and examples of such yarns include filament yarns and spun yarns. Examples of fibers forming the warp threads 11 and the weft threads 12 include synthetic fibers such as polyethylene, polypropylene, polyamide, aramid resin, polyester, nylon, acrylic resin, polyethylene terephthalate (PET), etc., semi-synthetic fibers such as rayon, and natural fibers such as cotton.

[0024] The form of the warp threads 11 and the weft threads 12 is not particularly limited, but in this embodiment, the warp threads 11 are made of multifilament yarns of polyethylene terephthalate (PET).

[0025] As shown in FIG. 2(b), the warp threads 11 are made up of a plurality of pile threads 20 woven into the weft threads 12 and arranged side by side in the warp thread 11 direction (direction A in FIG. 2). The pile threads 20 are made up of first warp threads 11A that contact the pile threads 20 from both sides in the weft thread 12 direction, and second warp threads 11B that do not contact the pile threads 20.

[0026] The first warp yarn 11A is woven so as to straddle the weft yarn 12 and appear on the front side 10a of the base fabric 10 in a region (indicated by R in Figs. 1 and 2) where it contacts the pile yarn 20 woven into the weft yarn 12. Specifically, the first warp yarn 11A is woven so as to straddle three weft yarns 12, namely the weft yarn 12a into which the pile yarn 20 is woven, and the weft yarns 12b, 12b adjacent to the weft yarn 12a on both sides and sandwiching the pile yarn 20 therebetween, and appear on the front side 10a of the base fabric 10. The second warp threads 11B are alternately woven into the weft threads 12 between pile rows 21 formed of pile threads 20 woven into the weft threads 12 so as to be sandwiched from both sides by the first warp threads 11A, and are spaced apart from the pile threads 20 by the first warp threads 11A.

[0027] In addition, the first warp yarns 11A are thicker than the second warp yarns 11B that do not contact the pile yarns 20. This makes it possible to reduce the gaps in the direction of the weft yarns 12 at the bases of the pile yarns 20. In addition, the second warp thread 11B is thinner than the first warp thread 11A. When the first warp thread 11A has a thickness of 334T (decitex) / 96F (filament) (334 dtex for 96 multifilaments), the thickness of the second warp thread 11B is preferably 235T (decitex) / 48F (filament) (235 dtex for 48 multifilaments). In this embodiment, the thin second warp thread 11B having a thickness of 235T / 48F is alternately woven into the weft thread 12 between the pile rows 21, so that the warp density of the base fabric 10 is higher and the gap between the pile rows 21 is wider than when the second warp thread 11B is not woven between the pile rows 21. In this way, the second warp thread 11B is alternately woven into the weft thread 12 between the pile rows 21 to hold the weft thread 12 and form the base fabric 10.

[0028] The weft yarn 12 is made of synthetic fiber with a thickness of 500 denier or less. As an example, a polyethylene terephthalate (PET) spun yarn formed to have a thickness of ST20 / 1 in the English cotton count is used. Since the weft yarn 12 is made of a thin spun yarn with a thickness of ST20 / 1 in the English cotton count to match the first warp yarn 11A with a thickness of 235T / 48F, the tightening force of the pile yarn 20 is weakened, and the pile yarn 20 can be easily flattened as described below.

[0029] (1.3) Pile yarn As shown in Fig. 2(a), the pile yarns 20 are woven into the weft yarns 12 in a generally U-shape so as to be raised on the base fabric 10, forming pile rows 21 along the warp yarns 11 direction (direction A in Fig. 2). As shown in Fig. 2(b), the pile rows 21 are arranged in a staggered manner along the warp yarns 11 direction (direction A in Fig. 2) so that adjacent pile yarns 20 in the weft yarn 12 direction are in a staggered relationship.

[0030] The pile yarn 20 is made of synthetic resin fiber having a low coefficient of friction and abrasion resistance, with a single yarn fineness of 3 to 15 denier and a fineness of 150 denier or more and 1000 denier or less. If the single yarn fineness is less than 3 denier and less than 150 denier, the strength of the pile yarn 20 is insufficient, and if the single yarn fineness is greater than 15 denier and exceeds 1000 denier, it becomes difficult to treat the pile collapse of the pile yarn 20, which will be described later.

[0031] Examples of synthetic resin fibers having a low coefficient of friction and abrasion resistance include polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), and tetrafluoroethylene copolymer (ETFE).

[0032] In this embodiment, the pile yarn 20 is a multifilament yarn of tetrafluoroethylene-hexafluoropropylene copolymer (FEP) formed to have a single yarn fineness of 5.6 denier and a fineness of 250T (decitex) / 40F (filament) (250 dtex for a total of 40 multifilaments), and the pile rows 21 are densely planted by making each bundle thinner.

[0033] "Variation 1" FIG. 3(a) is an enlarged schematic cross-sectional view of a powder sealing material 1A according to modified example 1, and (b) is a simplified plan view showing the weaving structure of the base fabric of the powder sealing material 1A according to modified example 1 and the arrangement of each pile on the base fabric. As shown in FIG. 3, the first warp thread 11A is woven across five weft threads 12, including the weft thread 12a into which the pile thread 20 is woven, the weft threads 12b, 12b adjacent to the weft thread 12a on both sides and sandwiching the pile thread 20 therebetween, and the weft threads 12c, 12c adjacent to the weft threads 12b, 12b, so as to be exposed on the front side 10a of the base fabric 10. The second warp threads 11B are alternately woven into the weft threads 12 between pile rows 21 formed of pile threads 20 woven into the weft threads 12 so as to be sandwiched from both sides by the first warp threads 11A, and are spaced apart from the pile threads 20 by the first warp threads 11A.

[0034] In this way, the warp thread 11 includes the weft thread 12a with the pile thread 20 woven into it, and is woven across the two weft threads 12b, 12c on either side of it so as to appear on the front side 10a of the base fabric 10, thereby making it possible to further reduce the gap in the direction of the weft thread 12 at the base of the pile thread 20.

[0035] "Variation 2" FIG. 4(a) is an enlarged schematic cross-sectional view of a powder sealing material 1B according to variant example 2, and (b) is a simplified plan view showing the weaving structure of the base fabric of the powder sealing material 1B according to variant example 2 and the arrangement of each pile on the base fabric. As shown in FIG. 4, the pile yarn 20 is woven into three weft yarns 12a, 12b, 12b to form a substantial W shape, and the first warp yarn 11A is woven so as to be exposed on the front side 10a of the base fabric 10 in the region (indicated by R in FIGS. 1 and 2) where it comes into contact with the pile yarn 20 woven into the weft yarn 12, straddling the three weft yarns 12a, 12b, 12b into which the pile yarn 20 is woven and the weft yarns 12c, 12c that are adjacent to each other on both sides and sandwich the pile yarn 20 therebetween. The second warp threads 11B are alternately woven into the weft threads 12 between pile rows 21 formed of pile threads 20 woven into the weft threads 12 so as to be sandwiched from both sides by the first warp threads 11A, and are spaced apart from the pile threads 20 by the first warp threads 11A.

[0036] In this way, the warp yarn 11 includes three weft yarns 12a, 12b, 12b with the pile yarn 20 woven into an approximately W shape, and is woven so as to straddle the weft yarns 12c, 12c on both sides and appear on the front side 10a of the base fabric 10, thereby further reducing the gap in the direction of the weft yarn 12 at the base of the W-woven pile yarn 20.

[0037] (1.3) oblique hair FIG. 5(a) is an enlarged schematic cross-sectional view of the powder sealing material 1 after the fibers have been toppled, and (b) is a schematic view for explaining the process of toppling using a heat roller. As shown in FIG. 5(a), the pile yarns 20 are flattened in a direction parallel to the warp yarns 11 (direction A in FIG. 5(a)) with respect to the base fabric 10. As shown in FIG. 5(b), the flattening is performed by passing the pile-woven fabric, i.e., the base fabric 10 having the upright pile yarns 20 shown in FIG. 2(a), through a pair of heated heat rollers 50. For example, the base fabric 10 can be processed into one having flattened pile yarns 20 by passing the fabric between an upper roller 51 heated to 100-150° C. and a lower roller 52 heated to 80-120° C. with the pile yarns 20 facing the upper roller 51.

[0038] (1.4) Coating layer A rubber-based solvent-based adhesive, a hot-melt-type adhesive, an adhesive resin, or the like, which has flexibility when cured, is used as the coating layer 13. In this embodiment, the coating layer 13 is formed from a water-soluble synthetic resin emulsion. As the water-soluble synthetic resin emulsion, from the viewpoints of adhesion to materials, versatility, etc., a coating agent made of an acrylic synthetic resin emulsion or a vinyl acetate synthetic resin emulsion is preferably used. This is impregnated between the warp yarns 11 and weft yarns 12 that form the base fabric 10 to prevent fraying and to bond the pile yarns 20 to the base fabric 10.

[0039] The method of applying the coating agent to the base fabric 10 is not particularly limited, and examples thereof include knife coating, roll coating, spray coating, etc. Next, a heat treatment is performed to form the coating layer 13.

[0040] (1.5) Adhesive layer The attachment layer 30 is formed of a foam material, and is provided to give elasticity to the powder sealing material 1 and to allow the pile yarns 20 to contact the rotating body sufficiently without gaps. In particular, the powder sealing material 1 with the pile yarns 20 slanted has a thinner overall thickness and a reduced elasticity due to the pile yarns 20, and gaps are more likely to be formed when the powder sealing material 1 is brought into contact with the rotating body in a curved state. It is preferable to use a foam material for the attachment layer 30 that is elastic, heat-resistant, highly durable against deformation (sagging), and made of a material that can be bonded with an adhesive.

[0041] In particular, the foam material preferably has a 25% compression load value of 0.3 to 3 MPa, more preferably 0.5 to 2 MPa, according to the hardness test method A of JIS K 6400. If the compression load value of the foam material is lower than 0.3 MPa, the pile yarn 20 cannot be sufficiently brought into sliding contact with the rotating body. If the compression load value is higher than 3 MPa, the sliding resistance generated between the rotating body and the pile yarn 20 becomes large, and there is a risk that the rotation of the rotating body will be hindered. Examples of such foam materials include foamed resins such as polyurethane, polystyrene, and polypropylene, synthetic rubbers such as ethylene-propylene-diene copolymer rubber (EPDM) and chloroprene rubber, and thermoplastic elastomers such as natural rubber, olefins, and styrenes.

[0042] (2) Function of powder sealant Figure 6(a) is a schematic diagram explaining the arrangement of warp yarns 11 relative to pile yarns 20 in the powder sealing material 1 of this embodiment and the intrusion of toner, (b) is a schematic diagram explaining the arrangement of warp yarns 11 relative to pile yarns 20 in the powder sealing material 1C of the comparative example and the intrusion of toner, Figure 7(a) is a schematic cross-sectional view of a developing device 100 of an image forming apparatus that forms an image using toner, (b) is a schematic diagram explaining the powder sealing function of the powder sealing material 1, Figure 9 is a simplified oblique view showing the weave structure of the base fabric of the powder sealing material 1C of the comparative example and the standing state of each pile on the base fabric, Figure 10(a) is an enlarged schematic cross-sectional view of the powder sealing material 1C of the comparative example, and (b) is a simplified plan view showing the weave structure of the base fabric of the powder sealing material 1C of the comparative example and the arrangement state of each pile on the base fabric. The function of the powder sealant 1 according to this embodiment will be described below by taking a developing device 100 in an image forming apparatus as an example of its use.

[0043] (2.1) Developing device As shown in FIG. 7, the developing device 100 is mainly composed of a developing housing 101, a developing roller 102 arranged opposite the photosensitive drum 120, a supply roller 103 that supplies toner, as an example of powder inside the developing housing 101, to the developing roller 102, a layer regulating blade 104 that regulates the thickness of the toner layer, a toner scattering prevention film 105 attached to the lower edge of an opening provided in the developing housing 101, and a powder sealing material 1 attached to the developing housing 101 with its inner edge 1a abutting against both side ends 104a of the layer regulating blade 104 (see FIG. 7(b)) and with the pile yarn 20 in contact with the surface of the developing roller 102.

[0044] In the opening of the developing housing 101, a layer control blade 104, a powder sealing material 1, and a toner scattering prevention film 105 are provided in contact with the developing roller 102 to form a closed space communicating with the developing housing 101, and the developing housing 101 contains toner of one of yellow (Y), magenta (M), cyan (C), or black (K). Incidentally, the developing roller 102 is, for example, cylindrical with an outer diameter of about 10 to 20 mm, and the powder sealing material 1 is bent so as to contact approximately half the circumference of the rotating developing roller 102, and is attached to the developing housing 101 (see FIG. 7(a)).

[0045] (2.2) Function of powder sealant The developing roller 102 conveys the toner, which has been supplied by a supply roller 103 and coated with a thin layer by a layer regulating blade 104 , to a photoconductor drum 120 . Most of the toner regulated by the layer regulating blade 104 is collected into the developing housing 101 by the supply roller 103, but at both side ends 104a of the layer regulating blade 104, the toner flows laterally as the developing roller 102 rotates and attempts to leak out of the developing housing 101 (see arrow R1 in Figure 7(b)). In this state, the pile yarns 20 of the powder sealant 1 come into contact with the surface of the rotating developing roller 102 while rubbing against it, and collect the toner between the fibers that tends to flow laterally and leak out, and block it, suppressing leakage to the outside of the developing housing 101.

[0046] As shown in Figures 9 and 10, the powder sealing material 1C of the comparative example is composed of pile rows 21 each made of a plurality of pile yarns 20 woven into the weft yarns 12 and arranged side by side along the direction of the warp yarns 11, and pile rows 21 each arranged so that each pile yarn 20 is arranged in a staggered relationship. In the simplified perspective view of Figure 9, similar to Figure 1, the warp yarns 11 and the weft yarns 12 are shown with gaps between them to make the weave structure of the base fabric 10 easier to understand.

[0047] 10, in the powder sealing material 1C of the comparative example, the pile yarns 20 are woven into the weft yarns 12 to form a substantially U-shape, and the warp yarns 11 are woven alternately into each of the weft yarns 12. As a result, unevenness occurs on the front side 10a of the base fabric 10 due to the weaving of the warp yarns 11, and in areas where the warp yarns 11 are not exposed on the front side 10a of the base fabric 10, gaps S2 occur between the pile yarns 20 woven into the weft yarns 12 in the direction of the weft yarn 12 (indicated by S2 in FIG. 10(a)).

[0048] The gap S2 can be filled in the surface portion of the powder sealing material 1C by slanting the pile yarns 20, but there was a risk that the unevenness of the base fabric 10 would not be eliminated, especially at the base of the pile yarns 20, and gaps would remain. Therefore, as shown in FIG. 6(b), there was a risk that the toner flowing laterally and leaking out (indicated by the arrow in the figure) would leak out of the developing housing 101 through the gaps S2 in the pile row 21.

[0049] In the powder sealing material 1 according to this embodiment, the first warp yarns 11A arranged on both sides of the pile yarns 20 are woven so as to be exposed on the front side 10a of the base fabric 10 across the weft yarns 12 in the region in contact with the pile yarns 20, thereby reducing unevenness on the front side 10a of the base fabric 10. As a result, gaps (indicated by S1 in FIG. 2(a)) that tend to occur at the base of each pile yarn 20 are smaller than in the comparative example. 6(a), toner (indicated by the arrow in the figure) that flows laterally and tries to leak out is blocked by the first warp yarn 11A that is woven so as to straddle the weft yarn 12 and appear on the front side 10a of the base fabric 10 in the region that contacts the pile yarn 20, thereby suppressing leakage to the outside of the developing housing 101. In particular, the gap that is likely to occur at the base of the pile yarn 20 is reduced, suppressing leakage of toner to the outside of the developing housing 101.

[0050] As shown in Fig. 5(a), the pile yarns 20 are tilted in a direction parallel to the warp yarns 11. When the pile yarns 20 are attached to the developing housing 101, as shown in Fig. 6(a), the direction of the tilting is set to an angle of, for example, 45 degrees with the rotation axis 102c of the developing roller 102 (see Fig. 7(b)), thereby preventing toner (indicated by the arrow in Fig. 6(a)) from leaking out in the lateral direction from entering the pile yarns 20. EXAMPLES

[0051] FIG. 8(a) is an enlarged cross-sectional photograph of the powder sealing material 1 of the embodiment, and (b) is an enlarged cross-sectional photograph of the powder sealing material 1C of the comparative example. Examples and comparative examples that further embody the present embodiment will be described below.

[0052] (Example) The base fabric 10 was woven using a polyethylene terephthalate (PET) multifilament yarn formed to have a thickness of 334T (decitex) / 96F (filament) as the first warp thread 11A, a polyethylene terephthalate (PET) multifilament yarn formed to have a thickness of 235T (decitex) / 48F (filament) as the second warp thread 11B, and a polyethylene terephthalate (PET) spun yarn formed to have a thickness of British cotton count ST20 / 1 as the weft thread 12. Then, into this base fabric 10, multifilament yarn of tetrafluoroethylene-hexafluoropropylene copolymer (FEP) formed so as to have a single yarn fineness of 5.6d (denier) and a fineness of 500T (decitex) / 80F (filament) was woven as pile yarn 20.

[0053] In this weave, the pile yarns 20 are woven into the weft yarns 12 in a generally U-shape so as to raise the pile on the base fabric 10, and are arranged to form pile rows 21 along the direction of the warp yarns 11. The pile rows 21 are arranged alternately along the direction of the warp yarns 11 so that adjacent pile yarns 20 in the direction of the weft yarns 12 are in a staggered relationship. The first warp thread 11A is woven across three weft threads 12, namely, the weft thread 12a into which the pile thread 20 is woven, and the weft threads 12b, 12b adjacent to the weft thread 12a on both sides and sandwiching the pile thread 20 therebetween, so as to be exposed on the front side of the base fabric 10. The second warp threads 11B are alternately woven into the weft threads 12 between pile rows 21 formed of pile threads 20 woven into the weft threads 12 so as to be sandwiched from both sides by the first warp threads 11A, and are spaced apart from the pile threads 20 by the first warp threads 11A.

[0054] The base fabric 10 with the pile yarn 20 woven therein was coated and flattened, and a foam material was attached to form an attachment layer 30 to form a powder sealing material, which was then cut to a specified size to form the embodiment.

[0055] (Comparative Example) A base fabric 10 was woven with warp yarns 11 and weft yarns 12 similar to those in the examples, and a multifilament yarn of tetrafluoroethylene-hexafluoropropylene copolymer (FEP) having a single yarn fineness of 5.6d (denier) and a fineness of 500T (decitex) / 80F (filament) was woven as pile yarn 20. In this case, the pile yarns 20 are woven in parallel with the weft yarns 12 in the direction of the warp yarns 11, and the pile yarns 20 are erected in a staggered relationship, and the warp yarns 11 are woven alternately with the weft yarns 12, which is the comparative example. Note that the number of filaments per unit area of ​​the pile yarns 20 was adjusted to be about 30% more than in the example.

[0056] The size of the gap at the base of the pile yarn was evaluated for the above-mentioned Example and Comparative Example. The gap was evaluated by observing the powder sealant under a microscope while it was compressed to a specified thickness. The results of the Example are shown in Figure 8(a), and the results of the Comparative Example are shown in Figure 8(b). As shown in Figures 8(a) and (b), it was confirmed that the gaps at the base of the pile yarns (indicated by the arrows in the figures) were filled in the example compared to the comparative example, in which the gaps at the base of the pile yarns (indicated by the dashed circle in the figures) were clearly observed.

[0057] The above results show that by weaving the first warp thread 11A, which has a thickness of 334T / 96F, into the weft thread 12 into which the pile thread 20 is woven and across the weft threads 12 on both sides of that weft thread so that it is exposed on the front side 10a of the base fabric 10, the gap at the base of the pile thread 20 can be reduced compared to the comparative example.

[0058] Although the embodiment of the present invention has been described above in detail, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention described in the claims. For example, the first warp thread 11A may be woven so as to straddle the weft thread 12 and appear on the front side 10a of the base fabric 10 in a region (indicated by R in Figs. 1 and 2) where it contacts the pile thread 20 woven into the weft thread 12 and is in contact with the pile thread 20 from one side in the direction of the weft thread 12. In this case, it is preferable to attach the first warp thread 11A to the developing housing 101 so that the first warp thread 11A side faces the developing roller 102 side. In addition, the powder sealing material of this embodiment can be widely used as a powder sealing material that can be applied to powder feed rollers of packaging machines, etc. that package fine powder medicines, and that can suppress leakage of medicines from the gap between the powder feed roller and the housing. [Explanation of symbols]

[0059] 1, 1A, 1B, 1C... Powder sealing material 10...Base fabric 11...Warp thread 11A: First warp thread 11B: Second warp thread 12...Weft thread 13. Coating layer 20. Pile yarn 21 Pile row 30....Attachment layer 100...Developing device 101···Developing housing 102 Developing roller 104...Layer Control Blade S1, S2: Gap

Claims

1. A powder sealing member comprising a plurality of pile yarns raised on a base fabric obtained by weaving a plurality of warp yarns and weft yarns extending in mutually intersecting directions, The warp yarns are composed of a first warp yarn that is woven so as to be exposed on the front side of the base fabric, straddling the weft yarn into which the pile yarn is woven and the weft yarns adjacent to the weft yarn on both sides of the weft yarn and contacting the pile yarn from both sides of the pile yarn in the weft direction, and a second warp yarn that is separated by the first warp yarn and woven into the weft yarn without contacting the pile yarn from the weft direction. A powder sealing material characterized by:

2. The first warp thread is thicker than the second warp thread.

2. The powder sealing material according to claim 1.

3. The pile yarn is a synthetic resin fiber having a single yarn fineness of 3 to 8 denier and a fineness of 150 denier or more and 1000 denier or less, and having a low friction coefficient and abrasion resistance.

3. The powder sealing material according to claim 1 or 2.

4. The pile yarns are tilted in a direction parallel to the warp yarns.

4. The powder sealing material according to claim 1, wherein the powder sealing material is a resin.

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