Experiment on the mechanical properties of the epidermis of the lotus root
[Objective]In order to explore the mechanical peeling technology of lotus root,the external shape and skin mechanical properties of main lotus root for deep processing were studied.[Method]Taking the widely planted main lotus root of E lian NO.5 as the object,the dimensions,the distance between the cross-sectional pores and the surface(short for hole margin),and the cross-sectional contour were mea-sured and statistically analyzed.The cutting and tensile characteristics of the lotus root epidermis were in-vestigated by using a texture analyzer,with the peeling cut limit force as the evaluation index,the cutting di-rection,the sampling site and the loading speed as the test factors.The ultimate tensile strength was used as the evaluation index,and the sampling site and tensile direction were used as the influencing factors.[Result]The body length,width and height of the three main sections were 98.16～238.57 mm,62.51～91.11 mm and 57.57～86.48 mm,and the epidermal water content was 80.46%～86.28%.The cross-sectional outline of lotus root shows concave and convex appearance characteristics,and the axial hole edge distance and concave appearance characteristics show a decreasing trend from the maximum section to both ends.In order to reduce the damage of the lotus root body during mechanical cutting,the peeling thickness t of lotus root should be t<3.00 mm.The average axial cutting force was(9.13±1.55),(11.31±1.48),(12.06±1.10)N,and the average circumferential cutting force was(10.21±1.97),(12.88±2.45),(12.28±1.42)N,respectively.The specimen location and loading speed have a significant influence on the peel cutting force,and the cuting direction has significant influence on the peeling cut force.The average axial tensile strength of the root skin of the three main sections was(1.41±0.15),(1.29±0.260),(1.08±0.22)MPa,and the average circumferential tensile strength was(0.62±0.09),(0.67±0.25),(0.71±0.19)MPa,respectively.The axial tensile strength of lotus root skin is higher than that of the cir-cumferential tensile strength.[Conclusion]A circumferential copying mechanical peeling mechanism is de-signed to reduce cutting resistance and improve the efficiency of mechanical peeling by increasing cutting speed.
NETL
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万方数据
