Multilayer fabric for nonwoven fabric

{
  "publication_number": "US12221727B2",
  "country": "US",
  "kind": "B2",
  "title": "Multilayer fabric for nonwoven fabric",
  "abstract": "In a multilayer fabric for nonwoven fabric 30, an upper-surface-side fabric formed from upper-surface-side warps (1 Ub, 2 U, 3 U, 4 U, 4 U′, 5 Ub, 6 U, 7 U, 8 U, 8 U′) and upper-surface-side wefts (1 ′U, 2 ′U, 3 ′U, 4 ′U) and a lower-surface-side fabric formed from lower-surface-side warps (1 Lb, 2 L, 3 L, 5 Lb, 6 L, 7 L) and lower-surface-side wefts (1 ′L, 2 ′L, 3 ′L, 4 ′L) are bound together. First warps (1 Ub, 5 Ub) of the upper-surface-side warps serve as first binding yarns that bind the upper-surface-side fabric and the lower-surface-side fabric, and second warps (1 Lb, 5 Lb) of the lower-surface-side warps serve as second binding yarns that bind the upper-surface-side fabric and the lower-surface-side fabric. A high-friction yarn is used as at least some of the upper-surface-side warps.",
  "claims": [
    "1. A multilayer fabric for nonwoven fabric, comprising: an upper-surface-side fabric formed from upper-surface-side warps and upper-surface-side wefts; and a lower-surface-side fabric formed from lower-surface-side warps and lower-surface-side wefts, the upper-surface-side fabric and the lower-surface-side fabric being bound together, wherein first warps of the upper-surface-side warps serve as first binding yarns that bind the upper-surface-side fabric and the lower-surface-side fabric, second warps of the lower-surface-side warps serve as second binding yarns that bind the upper-surface-side fabric and the lower-surface-side fabric, and a high-friction yarn having a dynamic friction coefficient that ranges from 0.3 to 1.9 is used as at least some of the upper-surface-side warps and the upper-surface-side wefts.",
    "2. The multilayer fabric for nonwoven fabric according to claim 1, wherein the upper-surface-side warps include third warps that each pass above one of the upper-surface-side wefts and then passes below the adjacent upper-surface-side weft and above the adjacent lower-surface-side weft.",
    "3. The multilayer fabric for nonwoven fabric according to claim 2, wherein the upper-surface-side fabric is formed by a plain weave.",
    "4. The multilayer fabric for nonwoven fabric according to claim 2, wherein at least some of the third warps are the high-friction yarns.",
    "5. The multilayer fabric for nonwoven fabric according to claim 1, wherein the upper-surface-side warps are larger in number than the lower-surface-side warps in a weave repeat.",
    "6. The multilayer fabric for nonwoven fabric according to claim 1, wherein at least some of the upper-surface-side warps are the high-friction yarns.",
    "7. The multilayer fabric for nonwoven fabric according to claim 6, wherein an upper-surface-side warp density of the upper-surface-side fabric falls within a range of 70% to 99%, and a lower-surface-side warp density of the lower-surface-side fabric falls within a range of 30% to 65%.",
    "8. The multilayer fabric for nonwoven fabric according to claim 6, wherein among the upper-surface-side warps, an upper-surface-side warp having one end and another end joined together to form a loop is not the high-friction yarn.",
    "9. The multilayer fabric for nonwoven fabric according to claim 1, wherein at least some of the upper-surface-side wefts are the high-friction yarns.",
    "10. The multilayer fabric for nonwoven fabric according to claim 9, wherein the upper-surface-side wefts that are the high-friction yarns are woven in a manner as to prevent intersections with the upper-surface-side warps from protruding from an upper surface of the upper-surface-side warps.",
    "11. The multilayer fabric for nonwoven fabric according to claim 9, wherein the first binding yarns and the second binding yarns form pairs, the first binding yarns each pass under at least two first lower-surface-side wefts among the lower-surface-side wefts to form a first lower-surface-side intersection, the second binding yarns each pass under at least two second lower-surface-side wefts different from the first lower-surface-side wefts among the lower-surface-side wefts to form a second lower-surface-side intersection, and the first lower-surface-side intersection and the second lower-surface-side intersection are formed alternately in a conveyance direction of a nonwoven fabric.",
    "12. The multilayer fabric for nonwoven fabric according to claim 9, wherein an upper-surface-side warp density of the upper-surface-side fabric falls within a range of 50% to 90%, and a lower-surface-side warp density of the lower-surface-side fabric falls within a range of 10% to 40%."
  ],
  "description_excerpt": "The present invention relates to a multilayer fabric used for conveying a nonwoven fabric.\n\nIn the related art, an apparatus configured to supply a fiber aggregate\n\nonto a running endless mesh belt and then form a nonwoven fabric while conveying the fiber aggregate has been developed. One of the characteristics required for such a mesh belt with a recent increase in conveyance speed is grip that allows the fiber aggregate supplied onto the mesh belt to be stably conveyed (the fiber aggregate does not float or shift during conveyance).\n\nFor example, a technique has been developed in which a U-shaped composite single fiber using a polyester U-shaped single fiber having a thermoplastic polyurethane (“TPU”) insert melt-bonded to a U-shaped pocket is used to impart grip to a sheet being conveyed (see Patent Literature 1).\n\n[Patent Literature 1] JP2006-512505 A\n\nThe thermoplastic polyurethane described above, however, is not necessarily suitable as yarns used for a fabric for nonwoven fabric from the viewpoint of wear resistance.\n\nThe present invention has been made in view of such circumstances, and it is therefore an object of the present invention to provide a new technique applied to a fabric used as a belt suitable for conveying a nonwoven fabric.",
  "cpc": [
    "D03D 11/00",
    "B65G 15/30",
    "B65G 15/54",
    "D03D 1/0041",
    "D03D 1/0094",
    "D03D 13/00",
    "D03D 13/004",
    "D03D 15/275",
    "D03D 15/283",
    "D03D 15/533",
    "D03D 15/58",
    "D04H 3/018",
    "D10B 2331/04",
    "D10B 2331/10"
  ],
  "ipc": [
    "B65G 15/30",
    "D03D 1/00",
    "D03D 11/00"
  ],
  "assignees": [
    "Nippon Filcon Co Ltd"
  ],
  "inventors": [
    "Toru Egawa",
    "Tsutomu Usuki",
    "Keisuke Inoue"
  ],
  "filing_date": "2021-06-25",
  "publication_date": "2025-02-11",
  "grant_date": "2025-02-11",
  "priority_date": "2018-12-28",
  "application_number": "US-202117358949-A",
  "family_id": "71128764",
  "cited_by_count": 0,
  "citations": [
    "US5349990A",
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    "JP2010126848A",
    "US20100252137A1",
    "WO2012140993A1",
    "WO2012140992A1",
    "EP2698458A1",
    "CN104781165A",
    "US20150203994A1",
    "US20180223903A1",
    "WO2017186512A1",
    "US20190024270A1",
    "JP2018071030A"
  ]
}