不同特性烟丝应力松弛性能的特征规律研究
Study on characteristic laws of stress relaxation performance of cut tobacco with different properties
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摘要: 【目的】 研究不同特性烟丝的应力松弛规律及流变学特性。【方法】 以不同产区、部位、切丝宽度的烟丝及所卷制的中支卷烟为研究对象,通过测定应力松弛时间比率、平衡应力、黏性指数等参数,结合烟丝应力松弛流变学模型,分析烟丝特性与烟支物理指标对烟丝应力松弛性能的影响规律。【结果】 下部烟丝的应力松弛时间比率显著低于上部和中部烟丝,且平衡应力较高,表现出相对更好的流变力学稳定性;切丝宽度为0.8 mm时,烟丝的弹性和填充性能均达到相对最优水平;不同产区烟丝样品的应力松弛性能表现出明显差异,云南烟丝样品的应力松弛时间比率较高、较为柔软,河南烟丝样品具有较低的应力松弛时间比率和较好的弹性;平衡应力与修正封闭吸阻存在较强的相关性,相关系数达0.81。【结论】 烟丝应力松弛性能随产区、部位及切丝宽度的不同呈现规律性变化,平衡应力等流变学参数相较于填充值能更全面地反映烟丝的力学性能,这为制丝与卷接关联性研究提供了新思路。Abstract: 【Objective】 To investigate the stress relaxation behavior and rheological properties of cut tobacco with different properties. 【Methods】 Cut tobacco with varied producing areas, stalk positions and cut widths, as well as medium-diameter cigarettes processed from such cut tobacco, were adopted as the research objects. The effects of cut tobacco properties and cigarette physical indicators on the stress relaxation performance of cut tobacco were analyzed by determining key parameters including stress relaxation time ratio, equilibrium stress and viscosity index, in combination with the rheological model for cut tobacco stress relaxation. 【Results】 The stress relaxation time ratio of lower cut tobacco was significantly lower than that of upper and middle cut tobacco, accompanied by greater equilibrium stress, indicating relatively superior rheological mechanical stability. Both the elasticity and filling capacity of cut tobacco reached the relatively optimum level at a cut width of 0.8 mm. Significant differences were observed in the stress relaxation performance of cut tobacco samples from different producing areas: Yunnan samples exhibited a higher stress relaxation time ratio and softer texture, whereas Henan samples possessed a lower stress relaxation time ratio and favorable elasticity. A strong correlation existed between equilibrium stress and corrected closed resistance, with a correlation coefficient of 0.81. 【Conclusion】 The stress relaxation performance of cut tobacco varies regularly with variations in producing area, stalk position and cut width. Compared with filling value, rheological parameters including equilibrium stress can more comprehensively characterize the mechanical properties of cut tobacco, which offers novel insights into the research on the correlation between tobacco processing and cigarette making.
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Key words:
- cut tobacco /
- stress relaxation /
- rheology /
- equilibrium stress /
- cigarette physical indicator
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