发明名称 |
Process for producing paper or cardboard |
摘要 |
<p>A process of making paper or paper board comprising forming a cellulosic suspension, flocculating the suspension, mechanically shearing the suspension and optionally reflocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet,wherein the suspension is flocculated or reflocculated by introducing a water-soluble polymer of intrinsic viscosity above 3 dl/g into the suspension, characterized in that the water soluble polymer exhibits a rheological oscillation value of tan delta at 0.005 Hz of above 1.1. The process has the advantage of improving retention.</p> |
申请公布号 |
CZ20021578(A3) |
申请公布日期 |
2003.11.12 |
申请号 |
CZ20020001578 |
申请日期 |
2000.11.02 |
申请人 |
CIBA SPECIALTY CHEMICALS WATER TREATMENTS LIMITED |
发明人 |
HEARD MICHAEL BARRY;CHEN GORDON CHENG I. |
分类号 |
D21H21/10;C08F220/56;C08F220/60;D21H17/37;D21H17/45;D21H17/66;D21H17/68;D21H23/14;D21H23/76;(IPC1-7):D21H23/14 |
主分类号 |
D21H21/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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