Before introducing the maintenance skills of mold, let’s get to know the reason of rubber mold fouling first. Mold fouling is caused at the very beginning by the zinc sulfide (inorganic sediment) attaching on the mold, and forms a settled layer in grey color. As a function of temperature, the low molecular weights in mixture will attach on the microcrystal of zinc sulfide, and lead to the second phase of sedimentation (organic deposits). Oxidation products appear under a certain period of time, and give rise to carbon deposition. After knowing the causes of fouling, now we can do some measures for cleaning and maintenance.
1.Chemical cleaning. Adopt professional mold cleaning water, or diluted sulfuric acid to directly clean the fouling parts. This method has the advantage of high speed, and not too bad effect. But as it is chemical water, when cleaning, it will create irritating odor and pollute the environment. So this method has been gradually weed out.
2.Mechanical descaling. Currently, most of rubber product factories have equipped with sand blast machine, which can use resin sand to directly sandblasting the surface of mold. This method has better cleaning effect. It is a relatively common mold cleaning method.
3.Ultrasonic scaling. Utilize the principle of frequency and wave length to shake the fouling inside the die cavities. This method along with cleaning mold water will occur better effective, just higher cost.
4.Die electroplating. Plate a layer of hard chrome on the surface of mold. The practices show that this method is available to settle the deposit sediment on the surface, which is more applicable to mass rubber product molds.
