JP2022190635A - Powder seal material - Google Patents

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

The present invention relates to a powder sealing material.

A base fabric formed of a knitted fabric obtained by warp-knitting base threads attached to a support facing a moving body that contacts the fine powder, and a raised fabric on the base fabric that is in sliding contact with the moving body. There is known a cleaning material for fine particles, which includes a pile thread for cleaning the surface of a moving body by scraping off fine particles adhering to the surface thereof (Patent Document 1).

A predetermined gap between a movable body in contact with fine powder and a housing of the movable body is adhered to the surface of the movable body or the housing to seal leakage of the powder without hindering movement of the movable body. The sealing material is mainly composed of a pile fabric composed of a pile yarn that becomes a sliding feather and a base fabric of a plain weave fabric that supports it, and the pile yarn of the feather has a single yarn fineness of 6 denier or more and has a low friction coefficient. It is a synthetic resin fiber with abrasion resistance, and has a feather height of 1.5 mm or more and a feather density of 40,000/In ² or more, and has a coating layer on the back of the base fabric that prevents feathers from coming off. In addition, there is also known a sealing material for preventing leakage of fine particles, which is obtained by laying pile threads in a certain direction by heating (Patent Document 2).

JP 2005-141263 A JP-A-2005-37955

An object of the present invention is to provide a powder sealing material capable of suppressing leakage of powder to the outside.

In order to solve the above problems, the powder sealing material according to claim 1 is
A powder sealing material 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 is woven so as to straddle the weft and appear on the front side of the base fabric in a region where the pile yarn woven into the weft is in contact with the weft in the weft direction.
It is characterized by

The invention according to claim 2 is the powder sealing material according to claim 1,
The warp is exposed on the front side of the base fabric without being woven into at least the weft into which the pile yarn is woven and the weft adjacent to the weft.
It is characterized by

The invention according to claim 3 is the powder sealing material according to claim 1 or 2,
The warp yarns contact the pile yarns from both sides in the weft direction of the pile yarns,
It is characterized by

The invention according to claim 4 is the powder sealing material according to any one of claims 1 to 3,
The warp that contacts the pile yarn is thicker than the warp that does not contact the pile yarn,
It is characterized by

The invention according to claim 5 is the powder sealing material according to any one of claims 1 to 4,
The pile yarn is a synthetic resin fiber having a single filament fineness of 3 to 15 denier and a fineness of 150 denier or more and 1000 denier or less, and having a low coefficient of friction and abrasion resistance.
It is characterized by

The invention according to claim 6 is the powder sealing material according to any one of claims 1 to 5,
The pile yarns are piled in a direction parallel to the warp yarns,
It is characterized by

According to the first aspect of the invention, leakage of powder to the outside can be suppressed as compared with the case where this configuration is not provided.

According to the second aspect of the invention, the gap in the weft direction at the base of the pile yarn can be reduced compared to the case without this configuration.

According to the third aspect of the invention, the gap in the weft direction at the root of the pile yarn can be reduced compared to the case without this configuration.

According to the fourth aspect of the invention, the gap in the weft direction at the base of the pile yarn can be reduced compared to the case without this configuration.

According to the fifth aspect of the present invention, it is possible to increase the thread density per unit as compared with the case without this configuration.

According to the sixth aspect of the present invention, intrusion of powder into the sliding contact portion can be suppressed as compared with the case where this configuration is not provided.

FIG. 4 is a simplified perspective view showing the woven structure of the base fabric of the powder sealing material and the standing state of each pile on the base fabric. (a) is an enlarged schematic cross-sectional view of the powder sealing material, and (b) is a simplified plan view showing the woven structure of the base fabric of the powder sealing material and the arrangement of piles on the base fabric. (a) is an enlarged schematic cross-sectional view of the powder sealing material according to Modification 1, and (b) shows the woven structure of the base fabric of the powder sealing material according to Modification 1 and the arrangement of piles on the base fabric. It is a simplified plan view. (a) is an enlarged schematic cross-sectional view of the powder sealing material according to Modification 2, and (b) shows the woven structure of the base cloth of the powder sealing material according to Modification 2 and the arrangement of piles on the base cloth. It is a simplified plan view. (a) is an enlarged cross-sectional schematic diagram of a powder sealing material that has been fluffed, and (b) is a schematic diagram for explaining the process of fluffing with a heat roller. (a) is a schematic diagram for explaining the arrangement of warp yarns with respect to pile yarns and penetration of toner in the powder sealing material according to the present embodiment, and (b) is an arrangement of warp yarns with respect to pile yarns and toner in a powder sealing material of a comparative example is a schematic diagram for explaining the intrusion of 1A is a schematic cross-sectional view of a developing device of an image forming apparatus that forms an image using toner, and FIG. 1B is a schematic view for explaining a powder sealing function of a powder sealing material. FIG. (a) is an enlarged cross-sectional photograph of the powder sealing material of the example, and (b) is an enlarged cross-sectional photograph of the powder sealing material of the comparative example. FIG. 7 is a simplified perspective view showing the woven structure of the base fabric of the powder sealing material and the standing state of each pile on the base fabric according to the comparative example. (a) is an enlarged cross-sectional schematic diagram of the powder sealing material according to the comparative example, and (b) is a simplified plane showing the woven structure of the base fabric of the powder sealing material according to the comparative example and the arrangement state of each pile on the base fabric. It is a diagram.

Next, with reference to the drawings, the present invention will be described in more detail with reference to embodiments and specific examples, but the present invention is not limited to these embodiments and specific examples.
In addition, in the explanation using the drawings below, it should be noted that the drawings are schematic, and the ratio of each dimension is different from the actual one. Illustrations other than members are omitted as appropriate.

(1) Configuration of powder sealing material FIG. 1 is a simplified perspective view showing the woven configuration of the base fabric 10 of the powder sealing material 1 and the standing state of each pile thread 20 on the base fabric 10. FIG. 2B is an enlarged cross-sectional schematic diagram of the powder sealing material 1, and FIG. 4B is a simplified plan view showing the woven structure of the base fabric 10 of the powder sealing material 1 and the arrangement state of each pile thread 20 on the base fabric 10. FIG.
The configuration and function of the powder sealing material 1 according to this embodiment will be described below with reference to the drawings.

(1.1) Overall configuration of powder sealing material The powder sealing material 1 is a plurality of piles raised on a base fabric 10 obtained by weaving a plurality of warp yarns 11 and weft yarns 12 extending in mutually intersecting directions. As shown in FIG. 1, the warp yarn 11 is in contact with the pile yarn 20 woven into the weft yarn 12 to form a substantially U shape in the direction of the weft yarn 12 (indicated by R in FIG. 1). , and the weft 12 are woven so as to be exposed on the front side 10 a of the base fabric 10 . In the simplified perspective view of FIG. 1, the warp yarns 11 and the weft yarns 12 are shown with a gap therebetween in order to make the weaving structure of the base fabric 10 easier to understand.

As shown in FIG. 2( a ), the powder sealing material 1 has a coating layer 13 made of a synthetic resin coating agent on the back surface of the base cloth 10 . The base of 20 and the base fabric 10 are firmly joined. An adhesive layer 30 is provided on the back surface of the coating layer 13, and the adhesive layer 30 allows the powder sealing material 1 to be attached to an image forming apparatus using powder, for example.

(1.2) Base Fabric The base fabric 10 is a woven fabric obtained by weaving a plurality of warp yarns 11 and weft yarns 12 extending in mutually intersecting directions.
Highly durable and flexible yarns are used for the warp yarns 11 and weft yarns 12, and examples of such yarns include filament yarns and spun yarns.
The 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), semi-synthetic fibers such as rayon, and cotton. and other natural fibers.

The form of the warp yarns 11 and the weft yarns 12 is not particularly limited, but in the present embodiment, the warp yarns 11 are polyethylene terephthalate (PET) multifilament yarns.

As shown in FIG. 2(b), the warp yarns 11 are woven into the weft yarns 12 to form a plurality of pile yarns 20 which stand in line along the direction of the warp yarns 11 (direction A in FIG. 2). It consists of the first warp yarns 11A that come into contact with the pile yarns 20 from both sides in 12 directions and the second warp yarns 11B that do not come into contact with the pile yarns 20. As shown in FIG.

The first warp yarns 11A are exposed on the front side 10a of the base fabric 10 across the weft yarns 12 in a region (indicated by R in FIGS. 1 and 2) in contact with the pile yarns 20 woven into the weft yarns 12. interwoven. Specifically, the weft 12a in which the pile yarn 20 is woven and the weft 12a and the weft 12b, which are adjacent to the weft 12a on both sides and sandwich the pile yarn 20. It is woven to express.
The second warp yarns 11B are arranged between the pile rows 21 composed of the pile yarns 20 woven into the weft yarns 12 so as to be sandwiched from both sides by the first warp yarns 11A. are alternately woven into the weft yarns 12 at intervals of .

Also, the thickness of the first warp yarns 11A is thicker than that of the second warp yarns 11B that do not contact the pile yarns 20 . Thereby, the gap in the weft 12 direction at the base of the pile yarn 20 can be reduced.
The second warp yarns 11B are thinner than the first warp yarns 11A, and the thickness of the first warp yarns 11A is 334T (decitex)/96F (filaments) (334dtex in total of 96 multifilaments). In this case, the thickness is preferably 235T (decitex)/48F (filament) (48 multifilaments as a whole is 235dtex). In the present embodiment, thin second warp yarns 11B having a thickness of 235T/48F are alternately woven into the weft yarns 12 between the pile rows 21, so that when the thin second warp yarns 11B are not woven between the pile rows 21, In comparison, the warp density of the base fabric 10 is higher and the gaps between the pile rows 21 are wider. In this manner, the second warp yarns 11B are alternately woven into the weft yarns 12 between the pile rows 21, thereby holding the weft yarns 12 and forming the base fabric 10. As shown in FIG.

Synthetic fibers having a thickness of 500 denier or less are used for the wefts 12 . As an example, a polyethylene terephthalate (PET) spun yarn having a thickness of British cotton count ST20/1 is used. The weft yarn 12 uses fine spun yarn with a thickness of British cotton count ST20/1 to match the first warp yarn 11A with a thickness of 235T/48F. This makes it easier to treat the pile yarn 20 for falling down, as will be described later.

(1.3) Pile Yarns Pile yarns 20 are woven into the wefts 12 in a substantially U-shape so as to be raised on the base fabric 10 as schematically shown in FIG. A pile row 21 is formed along the A direction in 2). As shown in FIG. 2(b), the pile rows 21 are alternately arranged in the warp 11 direction (in FIG. A direction).

The pile yarn 20 is made of a synthetic resin fiber having a single filament fineness of 3 to 15 denier and a fineness of 150 to 1000 denier and having a low coefficient of friction and abrasion resistance. If the single yarn fineness is thinner than 3 denier and less than 150 denier, the strength of the pile yarn 20 is insufficient. become.

Synthetic resin fibers with low coefficient of friction and abrasion resistance include polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA ), tetrafluoroethylene copolymer (ETFE), and the like.

In the present embodiment, the pile yarn 20 is tetrafluoroethylene formed to have a single yarn fineness of 5.6 denier and a fineness of 250T (decitex)/40F (filament) (40 multifilaments as a whole is 250dtex). - The tufts are densely planted by thinning one bundle constituting the pile row 21 using multifilament yarns of hexafluoropropylene copolymer (FEP).

"Modification 1"
FIG. 3(a) is an enlarged cross-sectional schematic diagram of the powder sealing material 1A according to Modification 1, and FIG. It is a simplified plan view showing an arrangement state.
As shown in FIG. 3, the first warp yarn 11A is connected to the weft yarn 12a into which the pile yarn 20 is woven, and the weft yarn 12b, 12b and the weft yarn 12b, 12b that are adjacent to the weft yarn 12a on both sides and sandwich the pile yarn 20. The five wefts 12 of the adjacent wefts 12c, 12c are woven so as to be exposed on the front side 10a of the base fabric 10. - 特許庁
The second warp yarns 11B are arranged between the pile rows 21 composed of the pile yarns 20 woven into the weft yarns 12 so as to be sandwiched from both sides by the first warp yarns 11A. are alternately woven into the weft yarns 12 at intervals of .

In this way, the warp yarn 11 includes the weft yarn 12a into which the pile yarn 20 is woven, and is woven so as to be exposed on the front side 10a of the base fabric 10 across the two weft yarns 12b and 12c on both sides. By doing so, the gap in the weft 12 direction at the base of the pile yarn 20 can be further reduced.

"Modification 2"
FIG. 4A is an enlarged cross-sectional schematic diagram of the powder sealing material 1B according to Modification 2, and FIG. It is a simplified plan view showing an arrangement state.
As shown in FIG. 4, the pile yarn 20 is woven into three weft yarns 12a, 12b, 12b in a substantially W shape, and the first warp yarn 11A is woven into the pile yarn 20 woven into the weft yarn 12. 5 of the three wefts 12a, 12b, 12b in which the pile yarns 20 are woven and the wefts 12c, 12c that sandwich the pile yarns 20 at the contact area (indicated by R in FIGS. 1 and 2). It is woven so as to be exposed on the front side 10a of the base fabric 10 straddling the weft 12 of the book.
The second warp yarns 11B are arranged between the pile rows 21 composed of the pile yarns 20 woven into the weft yarns 12 so as to be sandwiched from both sides by the first warp yarns 11A. are alternately woven into the weft yarns 12 at intervals of .

In this way, the warp yarn 11 includes three weft yarns 12a, 12b, and 12b in which the pile yarn 20 is woven in a substantially W shape, and straddles the weft yarns 12c and 12c on both sides to the front side 10a of the base fabric 10. By being woven so as to be exposed, the gap in the direction of the weft yarn 12 at the base of the W-woven pile yarn 20 can be further reduced.

(1.3) Oblique bristles FIG. 5(a) is an enlarged schematic cross-sectional view of the powder sealing material 1 that has been bristled, and FIG.
As schematically shown in FIG. 5(a), the pile yarns 20 are piled on the base fabric 10 in a direction parallel to the warp yarns 11 (direction A in FIG. 5(a)). As shown in FIG. 5(b), the pile woven fabric, that is, the base fabric 10 having the upright pile yarns 20 shown in FIG. 2(a), is passed through a pair of heated heat rollers 50. . For example, the pile yarn 20 side is passed between the upper roller 51 heated to 100 to 150° C. and the lower roller 52 heated to 80 to 120° C. with the upper roller 51 side. It can be processed into a base fabric 10 having pile yarns 20 that have been piled.

(1.4) Coating Layer As the coating layer 13, a rubber-based solvent adhesive, a hot-melt adhesive, an adhesive resin, or the like is used, the cured layer of which has flexibility. In this embodiment, a coating layer 13 made of a water-soluble synthetic resin emulsion is provided.
As the water-soluble synthetic resin emulsion, a coating agent made of an acrylic synthetic resin emulsion or a vinyl acetate synthetic resin emulsion is preferably used from the viewpoint of adhesiveness to the material, versatility, etc., and the base fabric 10 is formed. It is impregnated between the warp yarns 11 and the weft yarns 12 to prevent fraying and to join the pile yarns 20 and the base fabric 10 together.

A method of applying the coating agent to the base fabric 10 is not particularly limited, and examples thereof include a knife coating method, a roll coating method, a spray coating method, and the like. Then, the coating layer 13 can be formed by heat treatment.

(1.5) Sticking Layer The sticking layer 30 is formed of a foam material, and is provided so as to impart elasticity to the powder sealing material 1 and to bring the pile thread 20 into sufficient contact with the rotating body without gaps. In particular, the powder sealing material 1 with the slanted pile yarns 20 has a small overall thickness, and the elasticity due to the pile yarns 20 is reduced. This is because a gap is easily formed. As the foam material forming the sticking layer 30, it is preferable to use a material that has elasticity, heat resistance, high durability against deformation (settling), and can be adhered with an adhesive.

In particular, the foam material preferably has a 25% compressive load value of 0.3 to 3 MPa, more preferably 0.5 to 2 MPa, according to JIS K 6400 hardness test method A. It is more preferable to use If the compressive load value of the foam material is lower than 0.3 MPa, the pile yarns 20 cannot be brought into sufficient sliding contact with the rotor. Further, when the compressive load value is higher than 3 MPa, the sliding contact resistance generated between the rotating body and the pile yarn 20 increases, which may hinder the rotation of the rotating body. 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; Elastomers and the like can be mentioned.

(2) Effect of powder sealing material FIG. 6(a) is a schematic diagram for explaining the arrangement of the warp yarns 11 with respect to the pile yarns 20 in the powder sealing material 1 according to the present embodiment and the invasion of toner, and FIG. FIG. 7A is a schematic cross-sectional view of a developing device 100 of an image forming apparatus that forms an image using toner; FIG. (b) is a schematic diagram for explaining the powder sealing function of the powder sealing material 1, and FIG. 9 shows the woven structure of the base fabric of the powder sealing material 1C according to the comparative example and the standing state of each pile on the base fabric. FIG. 10A is an enlarged cross-sectional schematic diagram of a powder sealing material 1C according to a comparative example; FIG. FIG. 4 is a simplified plan view showing an arrangement state of each pile;
Hereinafter, the action of the powder sealing material 1 according to the present embodiment will be described using the developing device 100 in the image forming apparatus as an example.

(2.1) Developing Device The developing device 100 includes, as shown in FIG. to the developing roller 102 side, a layer regulating blade 104 for regulating the thickness of the toner layer, a toner scattering prevention film 105 attached to the lower edge of the opening provided in the developing housing 101, and its inner edge. 1a is abutted against both side ends 104a of the layer regulating blade 104 (see FIG. 7(b)), and the pile thread 20 is in contact with the surface of the developing roller 102 and is the powder sealing material 1 attached to the developing housing 101. part is constructed.

At the opening of the development housing 101, a layer regulating blade 104, a powder sealing material 1, and a toner scattering prevention film 105 are provided in contact with the development roller 102 to form a closed space communicating with the development housing 101. Each one of yellow (Y), magenta (M), cyan (C), and black (K) toner is contained therein.
The developing roller 102 is, for example, cylindrical with an outer diameter of about 10 to 20 mm. (see FIG. 7(a)).

(2.2) Effect of Powder Seal Material The developing roller 102 conveys the toner supplied by the supply roller 103 and coated with a thin layer by the layer regulation blade 104 to the photosensitive 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. It tries to leak out of the housing 101 (see arrow R1 in FIG. 7(b)).
In this state, the pile thread 20 of the powder sealing material 1 rubs against the surface of the rotating developing roller 102 while rubbing against the surface of the rotating developing roller 102 to collect and dam the toner that flows laterally and is about to leak out between the fibers. It is stopped to suppress leakage to the outside of the developer housing 101 .

As shown in FIGS. 9 and 10, the powder sealing material 1C of the comparative example has a pile row 21 made up 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 erected so that the respective pile yarns 20 are in a zigzag relationship. In the simplified perspective view of FIG. 9, as in FIG. 1, the warp yarns 11 and the weft yarns 12 are shown with a gap in order to make the weave structure of the base fabric 10 easier to understand.

In the powder sealing material 1C of the comparative example, as schematically shown in FIG. 10, the pile yarns 20 are woven into the weft yarns 12 so as to form a substantially U-shape, and the warp yarns 11 are alternately arranged with respect to the respective weft yarns 12. is woven into Therefore, unevenness is generated on the front side 10a of the base fabric 10 due to the weaving of the warp yarns 11, and in a region where the warp yarns 11 are not exposed on the front side 10a of the base fabric 10, the weft yarns are intertwined between the pile yarns 20 woven into the weft yarns 12. A gap S2 is generated in 12 directions (indicated by S2 in FIG. 10(a)).

The gap S2 can be filled in the surface portion of the powder sealing material 1C by beveling the pile yarn 20, but especially at the base of the pile yarn 20, the unevenness of the base fabric 10 is not eliminated, and the gap is formed. was likely to remain.
Therefore, as schematically shown in FIG. 6(b), the toner (indicated by arrows in the figure) flowing in the lateral direction and about to leak out flows along the gap S2 of the pile row 21 and flows outside the developing housing 101. There was a risk of leakage to

In the powder sealing material 1 according to the present embodiment, the first warp yarns 11A arranged on both sides of the pile yarns 20 are exposed on the front side 10a of the base fabric 10 across the weft yarns 12 in the region where they contact the pile yarns 20. The unevenness on the front side 10a of the base fabric 10 is reduced. As a result, the gap (indicated by S1 in FIG. 2(a)) that tends to occur at the base of each pile yarn 20 is smaller than in the comparative example.
Therefore, as schematically shown in FIG. 6(a), the toner (indicated by arrows in the figure) flowing in the horizontal direction and about to leak out crosses over the weft yarns 12 in the area where the pile yarns 20 are contacted, and the base material is shunted. Leakage to the outside of the developing housing 101 is dammed by the first warp yarns 11A woven so as to be exposed on the front side 10a of the cloth 10, thereby suppressing leakage to the outside. In particular, the gaps that tend to occur at the roots of the pile yarns 20 are reduced, and leakage of toner to the outside of the developing housing 101 is suppressed.

The pile yarns 20 are piled in a direction parallel to the warp yarns 11, as shown in FIG. 5(a). 6(a), when the developing roller 102 is attached to the developing housing 101, an angle, for example, 45 6A), the penetration of the toner (indicated by arrows in FIG. 6A), which tends to flow laterally and leak out, into the pile yarn 20 is suppressed.

FIG. 8(a) is an enlarged cross-sectional photograph of the powder sealing material 1 of the example, and FIG. 8(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 embodiments will be described below.

(Example)
A polyethylene terephthalate (PET) multifilament yarn formed to have a thickness of 334T (decitex)/96F (filament) as the first warp yarn 11A, and a thickness of 235T (decitex) as the second warp yarn 11B. )/48F (filament) and a polyethylene terephthalate (PET) multifilament yarn formed to have a thickness of British cotton count ST20/1 as the weft 12. The base fabric 10 was woven using the spun yarn.
Then, a tetrafluoroethylene-hexafluoropropylene copolymer ( FEP) multifilament yarn was woven.

At this time, the pile yarns 20 were woven into the weft yarns 12 in a substantially U-shape so as to raise the pile yarns 20 on the base fabric 10 to form pile rows 21 along the direction of the warp yarns 11 . In addition, the pile rows 21 are alternately arranged along the warp 11 direction so that the pile yarns 20 adjacent to each other in the weft 12 direction of the pile yarns 20 have a zigzag relationship.
The first warp yarn 11A straddles three weft yarns 12, i.e., the weft yarn 12a into which the pile yarn 20 is woven and the weft yarn 12b, 12b, which is adjacent to the weft yarn 12a on both sides and sandwiches the pile yarn 20, on the front side of the base fabric 10. It is woven so that it appears in the
The second warp yarns 11B are arranged between the pile rows 21 composed of the pile yarns 20 woven into the weft yarns 12 so as to be sandwiched from both sides by the first warp yarns 11A. and alternately woven into the weft yarns 12.

The base fabric 10 into which the pile yarn 20 is woven is subjected to coating and fluffing treatment, and a foam material is attached as the attachment layer 30 to form a powder sealing material, which is then cut into a predetermined size. did.

(Comparative example)
Pile yarns 20 were formed on the base fabric 10 woven with warp yarns 11 and weft yarns 12 similar to those of the example so that the single yarn fineness was 5.6d (denier) and the fineness was 500T (decitex)/80F (filament). Multifilament yarns of tetrafluoroethylene-hexafluoropropylene copolymer (FEP) were woven.
At this time, the pile yarns 20 are woven into the weft yarns 12 along the direction of the warp yarns 11 as a weaving structure. The weft yarns 12 were woven alternately, and this was used as a comparative example. At this time, the number of filaments of the pile yarn 20 per unit area was adjusted to be about 30% larger than that of the example.

The size of the gap at the base of the pile yarn was evaluated for the above examples and comparative examples. The clearance was evaluated by observing the powder sealing material compressed to a predetermined thickness with a microscope. The results of the example are shown in FIG. 8(a), and the results of the comparative example are shown in FIG. 8(b).
As shown in FIGS. 8(a) and 8(b), it was confirmed that the gaps at the base of the pile yarn (indicated by arrows in the drawings) were filled in the example compared to the comparative example. In the comparative example, a gap at the root of the pile yarn (indicated by a dashed circle in the figure) was clearly observed.

From the above results, the first warp yarn 11A having a thickness of 334T/96F is exposed on the front side 10a of the base fabric 10 across the weft yarn 12 in which the pile yarn 20 is woven and the weft yarn 12 on both sides thereof. It was shown that by weaving, gaps at the roots of the pile yarns 20 can be reduced compared to the comparative example.

The embodiments according to the present invention have been described in detail above, but the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. is possible. For example, the first warp yarn 11A contacts the pile yarn 20 from one side in the direction of the weft yarn 12 in a region (indicated by R in FIGS. 1 and 2) that contacts the pile yarn 20 woven into the weft yarn 12. It may be woven so as to be exposed on the front side 10a of the base fabric 10 straddling the weft 12 in the state. In this case, it is preferable to attach the first warp yarn 11A to the developing housing 101 so that the developing roller 102 side faces.
Further, the powder sealing material according to the present embodiment is applied to a powder feed roller of a packaging machine or the like for packaging a fine powder drug, and prevents the drug from leaking from the gap between the powder feed roller and the housing. It can be widely used as a powder sealing material to suppress.

Reference Signs List 1, 1A, 1B, 1C... Powder sealing material 10... Base fabric 11... Warp 11A... First warp 11B... Second warp 12... Weft 13... Coating Layer 20... Pile yarn 21... Pile row 30... Attached layer 100... Developing device 101... Developing housing 102... Developing roller 104... Layer regulation blades S1, S2... gap

Claims (6)

A powder seal member comprising a plurality of pile yarns raised on a base fabric obtained by weaving a plurality of warp and weft yarns extending in mutually intersecting directions,
The warp is woven so as to straddle the weft and appear on the front side of the base fabric in a region where the pile yarn woven into the weft is in contact with the weft in the weft direction.
A powder sealing material characterized by: The warp is exposed on the front side of the base fabric without being woven into at least the weft into which the pile yarn is woven and the weft adjacent to the weft.
The powder sealing material according to claim 1, characterized in that: The warp yarns contact the pile yarns from both sides in the weft direction of the pile yarns,
The powder sealing material according to claim 1 or 2, characterized in that: The warp that contacts the pile yarn is thicker than the warp that does not contact the pile yarn,
The powder sealing material according to any one of claims 1 to 3, characterized in that: The pile yarn is a synthetic resin fiber having a single filament fineness of 3 to 15 denier and a fineness of 150 denier or more and 1000 denier or less, and having a low coefficient of friction and abrasion resistance.
The powder sealing material according to any one of claims 1 to 4, characterized in that: The pile yarns are piled in a direction parallel to the warp yarns,
The powder sealing material according to any one of claims 1 to 5, characterized in that:

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