Abstract: With the uniaxial test experiment device,the caking characteristics of concentrated laundry powder were tested and measured.Effects of three factors that influencing the extent of caking of the concentrated laundry powder,the temperature (30~60 ℃),the relative humidity (30%~75%) and the time (1~4 h) on the caking extent of concentrated laundry powder were examined.The caking kinetic plots of concentrated laundry powder at different temperature and relative humidity were also mapped out.The results showed that with the increase of temperature,time and relative humidity,the extent of agglomeration of the concentrated laundry powder increases gradually.Such results told us that during the various stages of the production process of concentrated laundry powder,such as blending,post addition conveying,packaging,storage et al.,all operaters and mangers should try to control the environmental temperature and humidity within a reasonable range,so as to reduce the impact on laundry powder agglomeration.

Key words: concentrated laundry powder, caking, uniaxial test, temperature, relative humidity