The molds of molds are treated with the surface corrosion reaction of the steel surface, such as concentrated sulphuric acid, forming the skin/erosion/pear ground or other forms of grain.
Is lousy skin grain, a lot of plastic parts surface is very thick leather grain, like a car instrument on the stage or storage battery mirrors, etc., fine grain with spark machine can play out, but do not to come out of coarse grain, you need to use chemical liquid will need mold cavity rotten into grain, also called texture
Make pattern, can make the surface of product surface and cavity surface can hold a small amount of air, do not form vacuum adsorption, make it easy to get out. Anti-skid, anti-roll, good handle. To make hemp or subsurface, prevent light reflection, eliminate eye strain and so on.
