The reason why the multi-purpose raincoat is multi-purpose is that it is different from other ordinary raincoats in that its general raincoat has a zipper or a row of buttons on the back or at the brim. It can be easily folded up when not in use and can also be used to store things.
Multi-purpose raincoats designed for different groups have different characteristics. The unique feature of the multi-purpose raincoat designed for farmers is that it is designed with buttons that can be used to fold back, so that the hem of the raincoat can be folded, which is convenient for farmers to work in the field. The folding design can solve the limitation of ordinary raincoats on the legs, and it is convenient for farmers to move their legs after folding. It can also be used as a general raincoat.
Objects are made up of molecules. The interaction force between molecules of the same substance is called cohesion; while the interaction force between molecules of different substances is called adhesion. When the cohesion is less than the adhesion, the “wetting phenomenon” will occur; otherwise, the “non-wetting phenomenon” will occur. Raincoats are impervious to water, precisely because the cohesion of water is greater than the adhesion of water to raincoats.
Physics also tells us that the cohesion of water creates surface tension on the surface of the water. The surface tension of water forms an elastic film on the water surface. When water is in contact with other objects, as long as the water does not infiltrate it, the elastic film is intact and can tightly wrap the water. Someone tried it: cleverly poured water into a metal sieve soaked in wax, and the water did not leak through the sieve.
Common glass, looks smooth and shiny. However, when the water met it, it was tightly entangled, which brought all kinds of troubles: when it rained, the rain on the front window glass blocked the driver’s sight, which was very unsafe, so the paddle had to be turned on. , to drain the rainwater; for people who wear glasses, when drinking hot water, the lenses are immediately covered with a layer of fog, blocking the line of sight, and nothing can be seen.
After people know the characteristics of the surface tension of water and the relationship between the cohesion and adhesion of water, they not only ingeniously make raincoats, but also create novel “water-repellent” glass – on ordinary glass Apply a layer of silicone compound film, which greatly weakens the adhesion of fog to glass. Using this kind of water-repellent glass as lenses relieves the trouble of fogging for those who wear glasses; if this kind of glass is installed on the front window of the car, the water paddle will not be used. Raincoat Wholesale Now you should be able to tell the truth that tarpaulins and cloth umbrellas do not leak rain!
