Characterization and Evaluation of Physical and Mechanical Properties of Un hulled Arabica Coffee Bean

2nd International Conference on Natural Products and Bioresource Sciences - 2018

生物科学;生态环境科学

Kuala, S.I.^1 ; Hidayat, D.D.^1 ; Anggara, C.E.W.^1 ; Saparita, R.^1

Development Center for Appropriate Technology, Indonesian Institute of Sciences, KS Tubun Street 5, Subang, West Java

41213, Indonesia^1

关键词: Angle of repose;    Average length;    Coffee beans;    Particle densities;    Physical and mechanical properties;    Static friction;    Surface area;    Texture profile;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/251/1/012040/pdf
DOI  :  10.1088/1755-1315/251/1/012040

来源: IOP

【 摘 要 】

This work was carried out to characterize the physical and mechanical properties of unhulled arabica coffee bean. The results of this work found that at moisture content of 18.76 ± 0.19 % wb, the average length, width, thickness, geometric diameter and surface area of unhulled coffee bean ranged from 12.04 ± 1.06 mm, 8.24 ± 0.45 mm, 4.99± 0.34 mm, 7.90 ± 0.38 mm and 196.44 ± 19.09 mm2 respectively. The average mass and volume ranged from 0.21 ± 0.06 g and 0.21 ± 0.06 cm3 respectively. The average particle density, bulk density and sphericity ranged from 1.00 ± 0.02 g/cm3, 0.40 ± 0.01 g/cm3 and 0.66 ± 0.04% respectively. The average porosity, aspect ratio, and shell content ranged from 60.16 ± 1.09 %, 68.88 ± 6.38% and 16.55 ± 5.70% respectively. The average hardness and fracturability ranged from 12.34 ± 1.28 gf and 2.45 ± 0.08 gf respectively. Regarding the angle of repose on the surface of stainless steel, aluminum, acrylic, and plywood results showed that the average emptying angle of repose ranged from 26.88 ± 3.67°, 29.44 ± 3.35°, 30.01 ± 4.83° and 40.0° ± 7.00° respectively, and the average filling angle of repose ranged from 32.02 ± 2.880°. Concerning friction, results of measurement indicated that average static friction of stainless steel, aluminum, acrylic, and plywood ranged from 0.36 ± 0.02, 0.40 ± 0.03, 0.38 ± 0.04 and 0.45 ±0.03 respectively. The highest emptying angle of repose occurred on the surface of plywood inversely of that was occurring on the surface of stainless steel. There was a positive relationship between the angle of repose and the static friction.