Guar gum used as a lubricant for cellulose fibers processed in a twin-screw extruder to obtain a thermocompressible paste for packaging material

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-04-28 DOI:10.1016/j.biteb.2025.102128

Emilien Freville , Alice Russo , Elisa Zeno , Maxime Terrien , Evelyne Mauret , Julien Bras

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Abstract

This study compares two different types of cellulosic materials to be dried by thermocompression: (i) microfibrillated cellulose (MFC) and (ii) pretretated cellulose fibers mixed to guar gum. Both were produced by twin-screw extrusion at 20 wt% (TSE) from an enzymatically pretreated cellulose fiber pulp. Without guar gum (GG) in TSE, fibers were microfibrillated. MFC drying by thermocompression remained challenging due to shrinkage. However, when GG was added to the fibers prior to extrusion, the fiber length was reduced only after five passes in the TSE (whereas it drastically decreases after one pass without GG) and modest fibrillation and fines content were measured, likely thanks to a lubricating and water retention effect of the GG. In terms of processability, the spreading of the fiber/GG paste was strongly enhanced in comparison to MFC paste. A thermocompressed material with a cohesive quality was successfully produced with the fiber/GG paste with a limited shrinkage.

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瓜尔胶用作纤维素纤维的润滑剂，在双螺杆挤出机中加工，以获得用于包装材料的可热压糊状物

本研究比较了两种不同类型的纤维素材料的热压干燥：(i)微纤化纤维素（MFC）和（ii）预处理纤维素纤维混合瓜尔胶。这两种产品都是由酶预处理的纤维素纤维浆在20% （TSE）的双螺杆挤出生产的。在TSE中不含瓜尔胶（GG），纤维微纤化。由于收缩，热压MFC干燥仍然具有挑战性。然而，当在挤压前向纤维中加入GG时，纤维长度仅在TSE中经过五道后才减少（而在没有GG的情况下，纤维长度在一道后急剧减少），并且测量了适度的纤维性和细粒含量，这可能是由于GG的润滑和保水性作用。在可加工性方面，与MFC糊状物相比，纤维/GG糊状物的铺展性得到了极大的增强。成功地用纤维/GG浆料制成了一种具有粘性的热压材料，收缩有限。

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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