What physical roperty does plastic have to dull metal cutters or blades?
Answer:
The metal (usually steel, or some other ferrous metal) is dulled by the action of adhesive wear. The carbon atoms in the plastic react with the iron in the ferrous metal, and some of the iron atoms are essentially pulled off the metal blades. This dulls the sharp edge.
The effect will be exacerbated with temperature, so if the couple gets heated, the reaction will be faster: but it doesn't have a threshold temperature.
This adhesive wear doesn't occur with those metals and alloys that have no affinity for carbon: cobalt alloys, for instance. So if you are designing a machine to chop nylon, and you can afford the cost of the blade, you might consider stellite, a triballoy, or other cobalt based alloy. Or just a hardface of a cobalt based alloy.
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