Hardness difference
Generally speaking, the hardness of the ceramic knife plate is stronger than that of stainless steel, but the ceramic is less of the toughness of stainless steel, more brittle, if it is submerged some hard coffee beans, or stones in the beans, the ceramics are more likely to be damaged. In fact, you can refer to the kitchen knives on the market, most of them are still stainless steel, and the ceramic knives are mainly some fruit knives, which can not be cut too hard.
In addition, ceramics is a molding, done after the basic will not be polished, correction.
Fever and heat dissipation
Coffee beans can hot during the grinding process due to extrusion friction, and these calories can also affect the flavor of the coffee. The thermal conductivity of ceramics is far less than that of stainless steel. The faster the grinding, the greater the heat, but the heating time of coffee powder will be short; the same grinding is slow, the heat is small, but the heating time of coffee powder will be extended, this needs to explore and control.
Stainless steel has a little better thermal conductivity, so most household electric bean mills are stainless steel cutters. Because the stainless steel material can transfer a part of the grinding heat out.
Wash and clean
Very direct, the ceramic knife plate can be directly washed, and stainless steel does not mean that it will not rust, generally can not be washed! But then again, the grinder generally does not need to wash clean, ceramic cutter plate can be washed, other parts can not necessarily see water.
Cost cost
The production of ceramic knife plate to open the mold, the cost can be said to be relatively large, but if it is a large number of production, the average cost can be much lower than stainless steel! After all, it only needs to open a mold, just like the printing factory printing leaflets, the price of 100 and 10000 copies is not big, mainly paper money.
So in the hand grinder bean market within 100 yuan, you will find that the vast majority of them are ceramic millstones, cheap! And some high-end grinder, products and market sales are not large, the cost of opening the mold is relatively large, so generally choose stainless steel knife plate.
personal suggestion
If you just start to buy a 100 yuan machine, ceramic knife plate is completely OK, cost performance is also high! Almost all are about the same!
If you want to buy a better hand mill, high-end, then don't tangle the knife plate! Look at the price! Your expensive nature has your expensive reason. Look at the brand, the price is relatively transparent, not easy to be pit. Besides, the grinder is not just a knife plate, its axis design and powder channel are all need to be considered.