紙機線上紙匹之交織與尺寸安定性之關係

Effects of Formation on the Sheet Dimensional Stability as Measured In Situ

紙機網上之紙匹交織成形及尺寸安定性影響紙性至鉅。在紙機上同時測定紙匹之交織成形及尺寸安定性尚無良法。利用抗張挺度配向（TSO）法成功地改善紙匹之尺寸安定性，同時裝在紙機上之WebForm 儀器可供調整紙匹之成形。利用裝在1 號及2 號紙機上之儀器所測定之TSO 角度大小可得線上成形數據，由所測定之數據可做調整閘片口之噴漿／網速之比值，漿料組成，換網時間之參考值，如此可強化紙之成形及尺寸安定性。現場試驗數據証明同時安裝WebForm 及TSO儀器，有助紙機之調整以改善紙機生產紙匹之成形及尺寸安定性。隨著紙匹基重之增加，1 號紙機之紙匹成形可獲改善，而2 號紙機生產之紙匹則呈相反之趨勢。綜言之，利用本驗驗所用之設備可同時改善紙匹之交織成形及尺寸安定性。 Formation and dimensional stability influence its quality to substantial extent. Currently there is no on-line instrument capable of measuring formation and dimensional stability simultaneously. The tensile stiffness orientation (TSO) test has been used successfully at the Long-Chen Paper Company's Dou-liu mill to improve dimensional stability of the sheets. Meanwhile, the WebForm installed on the production lines have also been worldwide used in paper machines for formation adjustment. The on-line formation data from the PM 1 and PM 2 machines at the mill were compared synchronously with their tensile stiffness orientation angles. The results were found to enable the adjustment of slice jet to wire speed ratio, furnish composition and replacement timing of wire screen etc. to achieve enhancing formation and dimensional stability. The results indicated the WebForm and TSO tester could be used in conjunction to assist in paper machine adjustments. The initial results led to improve formation with increasing grammages at PM 1 and a opposite trend with PM 2. When formation improves, dimensional stability also enhances, showing a positive correlation.

Formation and dimensional stability influence its quality to substantial extent. Currently there is no on-line instrument capable of measuring formation and dimensional stability simultaneously. The tensile stiffness orientation (TSO) test has been used successfully at the Long-Chen Paper Company's Dou-liu mill to improve dimensional stability of the sheets. Meanwhile, the WebForm installed on the production lines have also been worldwide used in paper machines for formation adjustment. The on-line formation data from the PM 1 and PM 2 machines at the mill were compared synchronously with their tensile stiffness orientation angles. The results were found to enable the adjustment of slice jet to wire speed ratio, furnish composition and replacement timing of wire screen etc. to achieve enhancing formation and dimensional stability. The results indicated the WebForm and TSO tester could be used in conjunction to assist in paper machine adjustments. The initial results led to improve formation with increasing grammages at PM 1 and a opposite trend with PM 2. When formation improves, dimensional stability also enhances, showing a positive correlation.