摘要
目的研究不同打浆度、温度和压力下,热压干燥与真空干燥方式对纸浆模塑材料强度性能的影响。方法分别利用热压干燥方式与真空干燥方式对纸浆模塑材料进行干燥成形,检测不同打浆度、温度和压力下模塑材料的抗张指数、耐破指数、戳穿强度和挺度,最后用扫描电镜对2种干燥方式下的纤维结构进行观察。结果热压干燥制得的模塑材料的抗张指数、耐破指数、戳穿强度和挺度均比真空干燥的性能高;材料的抗张指数、耐破指数和戳穿强度均随打浆度的提高呈现先升高后降低的趋势;耐破指数、戳穿强度和挺度随热压温度的升高而增强;热压压力增大,材料的戳穿强度增强,而挺度减小。通过扫描电镜观察,采用热压干燥方式的纤维间的结合比真空干燥方式的更紧密。结论热压干燥方式下,打浆度为65°SR,温度为110℃时,材料的抗张指数、耐破指数和戳穿强度值最高,分别为26.235 N·m/g,1.234 kPa·m2/g,3.42 J。在今后的生产实践中,可根据制备不同需求的纸浆模塑材料,选取合适的干燥方式。
Objective To study the effects of hot press drying and vacuum drying methods on the properties of material strength, under different beating degree, temperature and pressure. Methods Dry forming of the molded pulp material was con- ducted by hot press drying and vacuum drying methods. The tensile index, burst index, puncture strength and stiffness were tested under different beating degree, temperature and pressure. Finally, the fiber structure of the products prepared with two kinds of drying methods was observed by scanning electron microscope. Results The properties of molding material prepared by hot press drying method showed higher tensile index, burst index, puncture strength and stiffness than that obtained by vacuum drying method. The tensile index, burst index, puncture strength of materials first increased and then decreased with the in- crease of beating degrees. Burst index, puncture strength and stiffness are enhanced with temperature increasing. When the hot press pressure increased, the puncture strength of the material increased, while the stiffness decreased. By scanning electron microscopy, the hot press dried fibers bound to each other more closely than the vacuum dried fibers. Conclusion When the beating degree was 65 SR and the temperature was 110 ~C under hot press drying, the tensile index, burst index and puncture strength values were the highest, and the values were 26. 235 N m/g, 1. 234 kPa mZ/g and 3.42 J, respectively. In the fu- ture practice, according to the different needs of molded pulp material, the appropriate drying method can be selected.
出处
《包装工程》
CAS
CSCD
北大核心
2014年第7期22-28,共7页
Packaging Engineering
基金
国家林业公益性行业科研专项(201304506)
