【摘要】 <正> 一、概述 纸张是由植物纤维原料经过制浆和打浆处理后,再加入适量辅料(胶料、滑石粉、颜料等)抄造而成。一张成品纸一经抄造出来就具有一定的重量和含有一定比例的水分,重量和水分是表示纸张性质的两个基本参数,亦是纸张生产过程检测的重要内容。更多还原

【Abstract】 The subject matter is presented in three different parts. In the 1st part, general concepts and instrumentations adopted for the indication and recording of basis weights and moisture contents of paper webs are discussed. Importance of instrumentation for monitoring basis weights and moisture contents in paper-making are stressed. Three components of instrumentation are discussed.Monitoring of basis weights is practised with the help of radioactive nuclear type instrumentation. Radioactive source Pm147 is generated from a powdered metallurgical mangier. The ionization chamber is filled with air at a pressure slightly above atmospheric pressure. Signal currents are picked up by a vibrated condenser static current meter of high susceptibility. A deflection indicator, with gas permeation temperature compensator and also with automatic adjustments for paper dust etc., is employed. Environmental radioactive dosage is lower than government regulations. Hence, it is safe and reliable.更多还原