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Development of a fast brightness testing method for mechanical pulp based on microwave oven drying

机译：基于微波炉干燥的机械纸浆快速亮度试验方法的开发

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Brightness is an important quality parameter for pulp products, and it is important to have reliable measurement of pulp brightness in a timely manner for process control and/or quality control purposes. In these cir-cumstances, a quick testing method for pulp brightness is highly desirable. A rapid handsheet brightness testing method for lignin-rich mechanical pulp has been developed, which is based on the use of tap water to make handsheets and microwave ovens to rapidly dry the handsheet. Microwave oven fast drying decreased the handsheet brightness of mechanical pulp by 5–6 points due to the lignin-originated discol-oration reactions. The spray of ascorbic acid and ethylenediaminetetraacetic acid (EDTA) solutions to the handsheet can effectively inhibit these lignin discoloration reactions. With 0.2% ascorbic acid and 0.2% EDTA spraying on the wet pulp handsheet, the brightness of the handsheet from a peroxide-bleached stone groundwood pulp after the microwave oven fast drying method was similar to that obtained from the same pulp but following TAPPI Standard Test Method T 272 sp-12 “Forming handsheets for reflectance testing of pulp (sheet machine procedure)”. The effect of handsheet dryness on the handsheet brightness was also studied, and the results showed that the brightness reading was almost constant in the dry-ness range of 70% to 90%. The method developed is a reliable, fast brightness testing method for lignin-rich pulp that is of practical interest in industrial operations. Application: To provide fast and reliable brightness test results for process operation and quality control pur-poses, accelerated brightness testing methods for lignin-rich high yield pulp were developed and reported in this paper.
机译：亮度是纸浆产品的重要质量参数，并且对于处理控制和/或质量控制目的，可以及时可靠地测量纸浆亮度。在这些CIR-CUMISTASCAS中，非常希望纸浆亮度的快速测试方法。已经开发了一种富含木质素的机械纸浆的快速手抄夹亮度测试方法，这是基于自来水使手抄纸和微波炉迅速干燥手抄纸。微波炉快干由于木质素起源于木质素起源于木质素源性的抗烧坏术反应，减少了机械纸浆的手抄夹亮度5-6点。抗坏血酸和乙二胺四乙酸（EDTA）溶液对手抄液的溶液可以有效地抑制这些木质素变色反应。在湿纸浆手抄液上抗坏血酸和0.2％EDTA喷雾，在微波炉快速干燥方法中，在过氧化物漂白的石材纸浆中的手抄纸的亮度与来自相同纸浆的相似但在Tappi标准测试之后方法T 272 SP-12“形成纸浆的反射率测试的手抄纸（片机程序）”。还研究了手抄纸干燥对手抄纸亮度的影响，结果表明，在70％至90％的干扰范围内几乎恒定。该方法开发是一种可靠的快速亮度试验方法，用于木质素的富含木质素的纸浆，这对于工业运营具有实际兴趣。应用：为工艺运行和质量控制PURS姿势提供快速可靠的亮度测试结果，在本文中开发并报道了加速富含木质素的高产纸浆的亮度试验方法。

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    《TAPPI Journal》 |2020年第6期|共7页
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