A glass-fiber-reinforced cement panel and a process for its manufacture

{
  "publication_number": "EP0015538A1",
  "country": "EP",
  "kind": "A1",
  "title": "A glass-fiber-reinforced cement panel and a process for its manufacture",
  "abstract": "Disclosed are a glass-fiber-reinforced cement panel and a process for its manufacturing, according to which a cement slurry devoid of asbestos fiber consisting of 0.5-3.0% by weight of glass fiber or glass fiber and polyvinyl alcohol fiber in combination, and pulp in an amount 2-2.5 times the total amount of glass fiber and polyvinyl alcohol fiber, balance cement, is prepared; then, the cement slurry, with 0.005-0.6% by weight of a cement flocculant added in the midway as it is transferred from the chest to the bats, is subjected to the Hatschek sheetmaking process, thereby forming the glass-fiber-reinforced cement panel.",
  "claims": [
    "1. A process for manufacturing a fiber-reinforced cement panel by way of sheet-making with a cement slurry comprising the step of forming a slurry consisting of 0.5 - 3.0% by weight of glass fiber, with pulp added in an amount 2 - 2.5 times the amount of the aforementioned glass fiber, balance cement, the step of adding, to this cement slurry, 0.005 - 0.6% by weight of a cement flocculant, based on cement, and the step of sheet-making with the flocculant-added cement slurry above-mentioned.",
    "2. The process for manufacturing a fiber-reinforced cement panel, as specified in Claim 1, wherein the addition of the cement flocculant is made in the midway as the slurry, after being stirred, is fed from the chest to the bats.",
    "3. The process for manufacturing a fiber-reinforced cement panel, as specified in Claim 2, wherein the flocculant is polyacrylamide.",
    "4. The process for manufacturing a fiber-reinforced-cement panel by way of sheet-making with a cement slurry comprising the step of forming a cement slurry devoid of asbestos fiber prepared by adding, to cement, a total amount of 0.5 - 3.0% by weight of glass fiber and polyvinyl aocohol fiber, and pulp in an amount 2 - 2.5 times the total amount of the aforementioned glass fiber and polyvinyl alcohol fiber, the step of adding, to the cement slurry, 0.005 - 0.6% by weight of a cement flocculant based on the amount of cement, and the step of sheet-making with the aforementioned flocculant-added cement slurry.",
    "5. The process for manufacturing a fiber-reinforced cement panel, as specified in Claim 4, wherein the amount of polyvinyl alcohol fiber is less than 1/3 times the amount of glass fiber.",
    "6. The process for manufacturing a fiber-reinforced cement panel, as specified in Claim 4, wherein the glass fiber is produced by chopping the strand formed by collecting and setting monofilaments by the aid of a water soluble collector-setter, the chopped strand having a length of 3 - 19 mm.",
    "7. The process for manufacturing a fiber-reinforced cement panel, as specified in 1 or 4, wherein the addition of the flocculant is made in the midway as the cement slurry, after being stirred in the pulper, is being fed from the chest to the bats.",
    "8. The process for manufacturing a fiber-reinforced cement panel wherein the flocculant is polyacrylamide.",
    "9. The process for manufacturing a fiber-reinforced cement panel wherein for the polyacrylamide, a Na substituted polyacrylamide having a molecular weight of 3 - 13 million and represented by the undermentioned formula is employed; where m and n are integers, holding a relation of = 0.03 - 0.2.",
    "10. A fiber-reinforced cement panel formed by sheet-making with a material slurry consisting of 0.5 - 3.0% by weight of glass fiber, and pulp in an amount 2 - 2.5 times the amount of glass fiber, balance cement, with 0.005 - 0.6% by weight of a cement flocculant based on the amount of cement added.",
    "11. A fiber-reinforced cement panel formed by way of sheet- making with a material slurry consisting of 0.5 - 3.0% by weight of glass fiber and polyvinyl alcohol fiber, and pulp in an amount 2 - 2.5 times the total amount of the aforementioned glass fiber and polyvinyl alcohol fiber, balance cement, with 0.005 - 0.5% by weight of a cement flocculant based on the amount of cement added."
  ],
  "cpc": [
    "C04B 24/2652",
    "C04B 2103/008",
    "C04B 2111/12",
    "C04B 28/02",
    "Y02W 30/91"
  ],
  "assignees": [
    "KUBOTA LTD"
  ],
  "filing_date": "1980-03-04",
  "publication_date": "1980-09-17",
  "priority_date": "1979-03-06",
  "application_number": "EP-80101087-A",
  "family_id": "26364221",
  "citations": [
    "FR2312465A1",
    "FR2317250A1"
  ]
}