首页> 外文会议>Conference on engineering papermakers : Forming bonds for better papermaking >NEW PAPER MACHINE GARD™ SCREENING CONCEPT FOR IMPROVED PAPER QUALITY AND PAPER MACHINE EFFICIENCY
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NEW PAPER MACHINE GARD™ SCREENING CONCEPT FOR IMPROVED PAPER QUALITY AND PAPER MACHINE EFFICIENCY

机译:新型纸机GARD™筛分概念可提高纸质和纸机效率

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Gard™ screening involves high consistency screening of the mixed stock fed to the paper machine. The objective is to provide effective protection for the paper machine with very fine-slotted screens. This concept has shown significant improvement in paper machine operations compared to the conventional machine screening systems.Narrow slotted screens have been used already for some years in recycled fiber and mechanical pulping screening applications. However, the consistency is typically in low 0.7% to 2.0% range. In a conventional approach flow system the screening is carried out at very low headbox consistencies with high passing velocities. Any pressure disturbance from the screens will directly affect the paper quality. Screening efficiency is typically low because the screens normally are operated with large holes or slots to prevent any sudden pressure changes. Fine slots are hard to use between the machine chest and the headbox for this reason.Sunds Defibrator has developed a new screen to operate at high consistencies of 3.0% to 4.0% with high contaminant removal efficiencies. The DeltaScreen® T, allowing the use of very fine slots of 0.10mm to 0.30mm (0.004' to 0.012') in width, is the heart of the high consistency system by providing efficient barrier screening to eliminate even the smallest elements of contamination. This paper discusses the improvements of paper quality and paper machine efficiency in fine paper, newsprint, and board applications.
机译:Gard™筛选涉及对送入造纸机的混合原料进行高浓度筛选。目的是为带有细缝筛网的造纸机提供有效的保护。与传统的机器筛选系统相比,此概念已显示出造纸机操作的显着改善。窄缝筛已在回收纤维和机械制浆筛选应用中使用了多年。但是,稠度通常在0.7%至2.0%的较低范围内。在传统的进料流系统中,筛分是在非常低的流浆箱浓度下进行的,具有高通过速度。屏幕上的任何压力干扰都将直接影响纸张质量。筛分效率通常较低,因为筛网通常在较大的孔或缝隙下运行,以防止压力突然变化。因此,很难在机器箱和流浆箱之间使用细槽。SundsDefibrator开发了一种新型筛网,可在3.0%至4.0%的高稠度下运行,并具有较高的污染物去除效率。 DeltaScreen®T允许使用宽度为0.10mm至0.30mm(0.004'至0.012')的非常细的狭缝,它是高浓度系统的核心,它提供了有效的屏障筛分功能,甚至可以消除最小的污染元素。本文讨论了在高级纸张,新闻纸和纸板应用中纸张质量和造纸机效率的提高。

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