酶促打浆对竹浆性能的影响研究

Effects of Enzyme-aided Beating on the Properties of Bamboo Pulp

关键词:  竹浆  酶  打浆  强度性能  柔软度

Key Words:Bamboo pulp  Enzyme  Beating  Strength properties  Softness

摘要:利用丰富的竹资源开发高性能的纤维纸张产品,有助于缓解我国造纸纤维原料短缺的问题。本研究以硫酸盐法竹浆为原料,利用打浆手段调控竹浆纤维形态和结构,并结合生物酶处理实现降低能耗、提高纸张物理性能的目的。结果表明,随着打浆转数的提高,竹浆纤维长度下降,纤维的扭结和卷曲程度增加,细小组分含量增多,纸张强度性能随之上升,但柔软度性能下降。生物酶处理可以进一步调控纤维形态和结构,在保证打浆度的同时降低打浆转数(生物酶用量为40 u/g条件下,达到30°SR时的打浆转数从1500 r降低到1000 r)。酶促打浆处理可以增加纤维间结合强度,但降低纤维自身强度,导致纸张强度的降低、柔软性能的提高。经过纤维素酶和半纤维素酶分别促进的打浆处理(40 u/g用量到30°SR),竹浆纤维的零距抗张强度分别降低为3.40和3.96 kg/15mm,纸张层间结合强度分别提升至160.9和166.4 J/m2,干抗张指数分别为15.05和19.33 N·m/g、柔软度值分别为265.83和361 mN。本研究为竹浆纤维纸张的生产提供理论指导和技术支持。

Abstract:The development of high-performance plant-fiber products by utilizing the abundant bamboo resources can help alleviate the shortage of raw materials of papermaking fiber in China. This study regulated the morphology and structure of kraft bamboo pulp fibers through beating methods, combined with enzyme treatment to achieve the purpose of reducing energy consumption and improving the physical properties of handsheet. The results showed that as the beating revolution increased, the fiber length decreased, the degree of fiber kinking and curling increased, and the content of fine increased, leading to the improved strength and decreased softness. Enzyme treatment can further regulate the morphology and structure of fibers, reducing the beating revolutions while maintaining the same beating degree (with a enzyme dosage of 40 u/g, the beating revolutions decreased from 1500 to 1000 r when reaching 30°SR). The enzyme-aided beating treatment can increase the inter-fiber bonding strength, but reduce the fiber"s strength, resulting in the decrease in strength and improvement in softness performance of handsheet. With the enzyme-aided beating treatment by cellulase and hemicellulose (40 u/g dosage for 30°SR) , the zero-span tensile strength of fiber decreased to 3.40 and 3.96 kg/15mm, respectively, and the internal bond strength increased to 160.9 and 166.4 J/m2, respectively, the dry tensile index was 15.05 and 19.3 N·m/g, respectively, and the softness values were 265.83 and 361 mN, respectively. This study provides theoretical guidance and technical support for the production of bamboo-based paper.