The steps of fine roasting coffee beans Technical degree Taste introduction

The steps of fine roasting coffee beans Technical degree Taste introduction

To sum up, it is stewing below 30, and adjusting according to exhaust gas volume above 30. An important indicator of exhaust gas volume is the comparison between the speed of exhaust gas temperature rise and the speed of bean temperature rise.

A general rule is that the exhaust temperature rises faster than the bean temperature, the bean taste will be clean but the flavor will be weak, the exhaust temperature rises slower than the bean temperature, and the bean flavor will be strong but more stuffy.

Inner Pot

The choice of inner pot material is the most entangled place when making products. In the initial design, stainless steel materials can be coiled and welded, which is convenient for manufacturing, while cast iron materials are greatly invested in the initial stage, so stainless steel has become a very tempting choice. However, after testing, it was found that stainless steel inner pot could not transfer heat evenly to the whole inner pot, resulting in overheating and scalding coffee beans at some points. (Good stainless steel pots are composite structures, the bottom of the pot is generally more than three layers, the bottom layer of stainless steel outer layer, the middle layer of copper plate as an important heat conduction layer to disperse the uneven heat of the bottom of the pot, so that the internal stainless steel layer can be evenly heated.) However, such a technical solution is used on the inner pan of the baking machine. We really can't do it.) (PS: Three-layer structure requires a large stamping machine to integrate the structure and exhaust the air, and, people do is a flat plate, baking machine is a round inner pot)

So after spending almost all the money at the time, we made the R500 series of cast iron inner pots out of cast iron, which we still use today.

The cast iron material makes the inner pot of R500 reach the same material level as most imported models. We were proud for a long time until we learned about plasma spraying technology.

Far-infrared materials have large-scale applications in the food industry, but no one has tried it before in the harsh environment of baking machines. Variations in temperature, inner pot expansion, friction and coffee bean impact all present challenges. Until we tried to use plasma spraying technology to firmly adhere ceramic far-infrared materials to the inner pot, this problem was still solved. Knock, friction will not destroy its structure.