发明名称 |
Method of paper machine control and apparatus for the method |
摘要 |
The present invention is characterized in that in a simulation for predicting a steam pressure setpoint after grade change, an initial moisture percentage is evaluated from differences between bone-dry basis weights and between machine speeds before and after grade change; the bone-dry coated weight of a size is evaluated from the flow rate and concentration thereof; and then the dryer inlet moisture percentage of a web after a size press is calculated from the coated weight. Thus, the invention intends to improve the quality of products through precise dryer control, as well as reduce the time required for grade change, by precisely predicting the web's initial moisture percentage at the dryer inlet after grade change and precisely and quickly controlling dryer steam pressure during grade change.
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申请公布号 |
US6904331(B2) |
申请公布日期 |
2005.06.07 |
申请号 |
US20020058451 |
申请日期 |
2002.01.28 |
申请人 |
YOKOGAWA ELECTRIC CORPORATION |
发明人 |
SASAKI TAKASHI;YAHIRO KENICHIRO;MARUYAMA TAKAO;MORI YOSHITATSU;ISHIZAKI TAKAHIRO;TAKAO KENJI;SHIMIZU HIROFUMI |
分类号 |
D21F7/02;D21F5/00;D21G9/00;F26B3/00;G06F7/66;(IPC1-7):G06F7/66 |
主分类号 |
D21F7/02 |
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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