| 摘要 |
<p>A non asbestos corrugated sheet is made from an aq. slurry contg. on a dry weight basis 40-60% cement, 30-40% SiO2 and 5-15% cellulose fibers. The corrugated sheet(made with Hatscheck or Fourdrinier machine) is pressed to reduce thickness and then autoclaved (at 10MPa for 12-24hrs) to cause reaction between the SiO2 and cement. The sheet pref. has a dry density of at least 1400kg/m3. The SiO2 pref. has a specific surface area greater than 200m2/kg and gives the cellulose fibers a freeness of 18-35deg.S.R. The slurry may also include 0.5-1% polyamide fibers, up to 20% glass and/or orck fibers, pressing acids, carboxy methyl cellulose and plasticisers.</p> |
