| 吴治妍,李晓,王高升,李凤和,姚日生.麦草浆自由干燥收缩行为及其机制研究[J].中国造纸,2026,45(6):85-94 |
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| 麦草浆自由干燥收缩行为及其机制研究 |
| Study on the Freely Drying Shrinkage Behavior and Mechanism of Wheat Straw Pulp |
| 收稿日期：2025-12-31 修订日期：2026-01-21 |
| DOI：10.11980/j.issn.0254-508X.2026.06.010 |
| 关键词: 麦草浆 径向收缩率 自由干燥 保水值 |
| Key Words:wheat straw pulp radial shrinkage rate freely drying water retention value |
| 基金项目: |
| 作者 | 单位 | 邮编 | | 吴治妍* | 1天津科技大学轻工科学与工程学院,天津市制浆造纸重点实验室,天津,300457 | 300457 | | 李晓 | 1天津科技大学轻工科学与工程学院,天津市制浆造纸重点实验室,天津,300457 | 300457 | | 王高升* | 1天津科技大学轻工科学与工程学院,天津市制浆造纸重点实验室,天津,300457 | 300457 | | 李凤和 | 2合肥麦丝生物科技有限公司,安徽合肥,230031 | 230031 | | 姚日生 | 2合肥麦丝生物科技有限公司,安徽合肥,230031 | 230031 |
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| 摘要:针对以麦草浆为原料生产纸浆模塑制品时干燥收缩率高的问题，本研究探究了麦草浆抄造手抄片自由干燥收缩行为，并通过控制干燥温度和初始含水量，结合打浆、筛分和回用处理分析了纸张干燥收缩率的影响因素，最后阐述了纸张的干燥收缩机制。结果表明，麦草浆的自由干燥收缩率高达14%~19%，高于纸浆模塑工艺要求（≤5%）。干燥温度105 ℃条件下，通过湿压榨将纸幅初始含水量由89.7%降至53.3%，可使纸张干燥收缩率由18.9%降至16.4%；提高麦草浆的打浆度会增加纸张干燥收缩率，而对麦草浆进行细小组分筛除和回用2次处理后，纸张干燥收缩率由19.3%分别降至9.2%和10.1%。此外，干燥收缩率与纸浆打浆度和保水值均呈正相关性，且其与保水值的相关性更强。经105 ℃原位干燥后，麦草浆纤维的径向收缩率高达约36%，而杂细胞的径向收缩率<6%。 |
| Abstract:Addressing the issue of high drying shrinkage rate in wheat straw pulp used for the manufacture of pulp molding products， this study investigated the freely drying shrinkage behavior of handsheets made from wheat straw pulp. The influencing factors on the drying shrinkage rate of the papers were analyzed by controlling drying temperature and initial moisture content， combined with beating， screening， and reuse treatments. Finally， the mechanism of drying shrinkage of the papers was elucidated. The results showed that the freely drying shrinkage rate of wheat straw pulp was as high as 14%~19%， exceeding the requirement (≤5%) for pulp molding processes. At a drying temperature of 105 ℃， reducing the initial moisture content of the wet paper web from 89.7% to 53.3% by wet pressing， decreased the drying shrinkage rate of papers from 18.9% to 16.4%. Increasing the beating degree of wheat straw pulp raised the drying shrinkage rate of the papers， while removing fine fractions through screening and twice reusing， the freely drying shrinkage rate of papers made from wheat straw pulp reduced from 19.3% to 9.2% and 12.6%， respectively. Furthermore， the drying shrinkage rate was positively correlated with both the beating degree and the water retention value of the pulp， with a stronger correlation to the water retention value. After in-situ drying at 105 ℃， the radial shrinkage rate of wheat straw pulp fibers reached approximately 36%， while that of non-fibrous cells was less than 6%. |
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