Effect of sodium ascorbate on weathering performance of NaOH pulping and paper

IF 0.8 4区农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD

Drewno Pub Date : 2016-01-01 DOI:10.12841/WOOD.1644-3985.171.11

A. Gençer, S. M. Onat, A. Can, Ufuk Özgül, H. Sivrikaya, F. Yurdakurban

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引用次数: 7

Abstract

This study aimed to decelerate the weathering of paper from light by utilizing the antioxidant property of sodium ascorbate (SA), which is an ascorbic acid salt. Three different sessions of cooking were carried out by adding 2.5%, 5.0% and 7.5% of SA in proportion to the weight of a completely dried chip in addition to 24% NaOH in order to identify the influence of SA on cooking. It was observed that the pulp yield decreased when SA was added to the cooking. For that reason, it was decided to add SA into the control pulps instead of adding the digester. The same amount of SA was added to the control. The SA-added pulps were held in the agitator initially first for 2 hours and then 12 hours before making paper. So as to determine the influence of the treatment on the process. The paper was treated for 72, 144 and 256 hours and values of ∆L, ∆a, ∆b and ∆E were identified in order to determine the period of the SA’s efficacy against weathering. The total discoloration in all the samples of paper, displayed an increase with an extension of the time period. The lowest discoloration after a 256-hour time period was seen in the sample group where 7.5% of SA was added and soaked in the water. The final results indicated that the most appropriate concentration was 5% and that pulp suspension must be retained for 12 hours to improve mechanical properties.

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抗坏血酸钠对NaOH制浆造纸耐候性能的影响

本研究旨在利用抗坏血酸钠(SA)的抗氧化特性来减缓纸张的光老化。为了确定SA对蒸煮的影响，在完全干燥的薄片中分别添加2.5%、5.0%和7.5%的SA和24%的NaOH，进行了三次不同的蒸煮。结果表明，在蒸煮过程中加入SA后，纸浆得率降低。因此，决定在对照纸浆中加入SA，而不是加入蒸煮器。在对照组中加入等量的SA。添加sa的纸浆在搅拌器中首先保持2小时，然后在造纸前保持12小时。从而确定处理对工艺的影响。将纸张分别处理72、144和256小时，并确定∆L、∆a、∆b和∆E的值，以确定SA的抗风化作用时间。随着时间的延长，所有纸张样品的总变色程度都有所增加。在加入7.5% SA并浸泡在水中的样品组中，256小时后变色程度最低。最终结果表明，浆料悬浮液的最佳浓度为5%，浆料悬浮液必须保持12小时才能改善浆料的力学性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Drewno MATERIALS SCIENCE, PAPER & WOOD-

CiteScore

1.10

自引率

12.50%

发文量

审稿时长

>12 weeks

期刊介绍： Wood. Research papers. Reports. Announcements" ("Drewno") is an international scientific journal that publishes original results of innovatory basic and applied research concerning technological, technical, economic and ecological issues important for the wood science and forest-based industries, including their environment, and interesting to the international recipients. "Drewno" is an Open Access biannual journal. Aims and scope: wood science: anatomy, biology, chemistry, physics wood mechanical and chemical technology, inter alia, sawmilling, composite wood products, wooden construction, furniture making, wood pulp, paper making material engineering, biocomposites, nanocomposites material management environmental protection, safety of the processes, products and working stations biotechnology bioenergy, biofuels forestry: harvesting and wood quality wood-based industries economics The Editorial Board of the journal especially welcomes articles concerning increase in wood resources (wood mobilisation); innovative composites and lignocellulosic materials; new trends in the protection, modification and finishing of wood; biorefining of raw wood material; "green" building; new technologies of wood waste recycling; sustainable development; innovation management; and business networks.