成型工艺对废旧瓦楞纸箱制备包装材料性能的影响

Influence of molding process on the properties of packaging materials made from waste corrugated containers

通过实验测试,研究了利用废旧瓦楞纸箱制备高强度包装材料过程中,成型工艺对制备材料性能的影响。结果表明,在打浆度相同时,热压压力的增大会使试样的抗张强度、断裂伸长率和弹性模量均得到提升,而热压温度的升高只能使抗张强度和弹性模量得到提升;在热压温度165℃、打浆度35°SR、热压压力2 MPa条件下试样的断裂伸长率最大,150℃、27°SR、5 MPa条件下试样的耐破度出现峰值;热压温度越高,热压压力越小,试样的挺度越好。综合考虑,为了节约能源、缩短制备周期,较优的成型工艺方案为:打浆度27°SR,热压温度165℃,干燥方式根据实际需要选择5 MPa热压干燥或0.08 MPa真空干燥。

Experiments are conducted to study the effects of the forming process on the properties of high strength packaging materials made from waste corrugated containers. The results are as follows. With the same degree of beating, increase of the hot- pressing pressure can improve the tensile strength, elongation at break, and modulus of elasticity; Increase of the hot-pressing temperature can only improve the tensile strength and modulus of elasticity. When the hot-pressing temperature is 165%, beating degree is 35°SR and hot pressing pressure is 2 MPa, the elongation at break is the largest. And the peak of burst degree appears at the condition of 150℃, 27°SR, and 5 MPa. The higher the hot press temperature, the smaller the pressure and, the better the stiffness. The results also show that in order to save energy and shorten the preparation cycle, a better molding process scheme uses 27°SR beating degree and 165℃ hot-pressing temperature, while 5 MPa hot pressing drying or 0.08 MPa vacuum drying condition can be selected according to the specific demand.