The Time Dependence of the Detachment Force of Ground Micrometer-Size Particles from a Planar Substrate: Effect of Particle Rotation

The time dependence of the detachment force applied to 7 µm ground polyester particles coated with silica nanoparticles was determined by ultracentrifugation. It was found that the force required to separate the particles from the substrate increased during the first 24 hours and changed very little thereafter. Scanning electron microscopy (SEM) results suggest that the increase in adhesion is due to the particles rotating from their initial positions obtained during deposition. The role of the silica nanoparticles in determining the time dependence of the detachment force is discussed in terms of the JKR and Fuller-Tabor models.     

货架延时对瓶盖松开力矩的影响

以瓶盖的“松开力矩Tq”作为衡量瓶盖密封程度的参数（Tq越大,说明其密封性越好）,研究并发现Tq与商品在货架上的摆放延时te之间呈单驼峰的近似三阶曲线关系,在商品摆上货架的最初短期内,Tq呈增长趋势（密封变紧）,在10天左右时达到最高值（密封最紧）,然后逐渐下降（密封变松）。