About contact angle / sludge drying, slurry drying, waste drying

Degree of wetness can be expressed with contact angle.
For example, when a droplet drops on a desk, it sometimes forms round grain shape and sometimes spreads widely and flatly. For another example, surface of a clean newly bought cup gets wet easily though, surface of cup which has been used many times does not. It is because a very small amount of oil remains even after a cup is washed and oil is accumulated during a cup is used repeatedly. These residual oils repel water.
These conditions of wetness shown in the above phenomenon is called wettability and expression such as good/poor wettability is often used. Wettability can be shown by contact angle and object is said to be wet when contact angle is 90°or less. A characteristic that is having small contact angel is called hydrophilicity and one that is having large contact angle is called water repellency, and characteristics having especially strong water repellency / hydrophilicity is called super water repellency / super hydrophilicity as well.
Contact angle is an angle formed by water and surface of object, and expressed in Young’s equation together with value of surface tension between solid and liquid / interfacial tension.
Wettability of surface can be measured quantitatively by contact angel. Object having small surface tension has poor wettability and large contact angle when liquid contacts. On the other hand, solid object having large surface tension has good wettability and small contact angle when liquid contacts. At the surface of material which has strong water repellency such as teflon, contact angle becomes nearly 180°and droplet forms almost like a sphere when it is dropped. Generally, when interatomic / intermolecular bonding is strong and stable in a material, chemical reaction such as oxidation rarely occur since the material has small surface energy and low activity. Solid object having glossy surface tend to have larger contact angle compared by object that do not have.

Contact angle	A：Contact angle is large: poor wettability B：Contact angle is medium C：Contact angle is small: good wettability S：Contact angle is 0°	Young’s equation

Reference web-site Contact angle Wiki 

KENKI DRYER which is designed and manufactured based on internationally patented technologies can definitely solve troubles of drying sticky, adhesive, and viscous materials, and also of liquid slurry. For sludge drying, costs of our dryer are estimated to be retrieved in 2 or 3 years by reduced cost of industrial waste disposal. For raw material slurry drying, we recommend replacing traditional box-shaped compartment tray dryers which need laborious works of manual operation. While organic waste with high moisture content such as used tea leaves, soy pulps, food residues, livestock excretions etc. can be dried with low-temperature and without change in their components, it is possible to recycle the waste as fuels, soil conditioner, etc., to sell them with high price, and to contribute for the environment.
Because of the internationally patented technologies, our dryer has outstanding drying performance which can dry sticky, adhesive, and viscous materials, and also liquid slurry that no other dryers can take care without clogging inside of its body. Also, since its structure is simple, initial, running and maintenance costs are low. Please do compare with other company’s products. The structure is simple, therefore, it hardly breaks, it has small number of replacement parts, it is easy to be maintained, and its service life is long.
Please don’t hesitate to ask for solutions about troubles of drying sticky, adhesive, and viscous materials, and also of liquid slurry.

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