It is generally accepted in the industry that the surfactant in the drier is adsorbed on the surface of the dish at a temperature above its cloud point, forming a thin continuous film that reduces the solid-liquid interface energy and contact angle. The formation of the continuous mold makes the drainage of the surface faster and more uniform, and effectively reduces the formation/appearance of spots. According to the author's experience, this principle describes an ideal process. Because the surfactant in the driers needs to form a continuous film on the surface of the dish in a short period of two or three seconds, the premise is that a sufficiently high concentration of surfactant is required in the wicking working solution.

Due to the limitation of the cost of use, in general, the concentration of the surfactant in the actual rinse liquid is several tens of ppm. Even though the temperature is well above its cloud point, it is clear that under actual conditions of use (dense agitation caused by pressure spray), the surfactant body is also dispersed in water. At such low concentrations, in such a short period of time, many of the surfactants in the driers are taken away by the water stream in the absence of effective contact with the surface of the dishware. Thus, under actual operating conditions, the film formed by the surfactant on the surface of the dish may be incomplete and not sufficiently continuous.

Reducing the cloud point or water solubility of the surfactant may help to enhance its tendency to adsorb on the surface of the dish and speed up its adsorption, but this may have other adverse effects. If the cloud point is too low, the product will encounter great difficulties in preparation. If an additional water-soluble extender is needed, the cost will be greatly increased, and the spreadability of the rinse liquid may be deteriorated.

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