目的 研究低温干燥环境下瓦楞纸板的边压强度和抗弯性能,分析温度和湿度对其性能的影响规律。方法 以不同定量瓦楞纸板为研究对象,进行低温干燥预处理,通过边压和三点弯曲试验研究处理后纸板的力学行为。结果 在10 ℃下,相对湿度每下降5%,则边压强度下降5.0%~8.5%;瓦楞纸板边压强度随着温度的降低呈现先增加后降低的趋势,但整体上,其边压强度大于常温、常湿条件下;纸板的抗弯性能均随着相对湿度的降低而降低,当纸板的定量较大时,相对湿度对其抗弯性能的影响更大。抗弯性能在0 ℃左右时最高,在低温、干燥条件下纸板的边压强度和抗弯强度均大于常温、常湿条件下,相对湿度对瓦楞纸板边压强度的影响程度大于温度,而温度对纸板抗弯强度的影响大于相对湿度。结论 对于BC型瓦楞纸板,在10 ℃下,其边压强度和抗弯性能随着相对湿度的降低而降低,温度对它们的影响规律较为复杂,但低温干燥环境下瓦楞纸板的边压强度和抗弯性能高于常温常湿条件下,因此将边压强度和抗弯性能作为低温干燥环境下纸板的参考性能指标不足以表征纸板在该环境下的力学性能。
Abstract
The work aims to analyze the edge crush strength and bending resistance of corrugated board under low-temperature drying environments. Through low-temperature drying pretreatment on corrugated board with different basis weights, mechanical behavior characteristics were investigated using edge crush and three-point bending tests. The results demonstrated that: under 10 ℃ low-temperature drying conditions, a 5% RH decrease in humidity reduced edge crush strength by 5.0%-8.5%. The edge crush strength initially increased and then decreased with decreasing temperature, but remained higher than that under normal temperature and humidity conditions. The bending resistance of corrugated board decreased with the decrease of relative humidity, with humidity exhibiting greater influence than temperature at high quantity of board. The optimal bending resistance in drying environment occurred near 0 ℃. Under low-temperature drying conditions, the edge crush strength and bending resistance of the board were both greater than those under normal temperature and humidity conditions. The influence of relative humidity on the edge crush strength of corrugated board was greater than that of temperature, while the influence of temperature on the bending resistance of board was greater than that of relative humidity. The study concludes that for BC-type corrugated cardboard, the edge crush strength and bending resistance decrease with humidity at 10 ℃, and the influence law of temperature is more complicated, but the edge crush strength and bending resistance of corrugated cardboard under low-temperature drying environments are higher than those under normal temperature and humidity conditions so that the edge crush strength and bending resistance are not sufficient to characterize the mechanical properties of board under low-temperature drying environment as a reference performance index for the board under such environments.
关键词
瓦楞纸板 /
低温干燥 /
边压强度 /
抗弯性能
Key words
corrugated board /
low-temperature drying /
edge crush strength /
bending resistance
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基金
宁波日和新材料有限公司横向课题（441223074）
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