Do I need to seal the vents when roasting coffee beans?

Do the vents need to be sealed when baking coffee beans in the baking machine?

The reason for introducing these two ways is that the air pressure is different in different places and different seasons, and there will be a slight change. The friends of San Douke can make appropriate adjustments according to this.

To sum up, it is steaming below 30, and 30 is adjusted up according to the smoke discharge. An important index about the smoke discharge is the comparison between the rising speed of exhaust air temperature and the rising rate of bean temperature.

A general rule is that the exhaust temperature rises faster than the bean temperature, the beans will taste clean but the flavor will be weak, the exhaust temperature will rise more slowly than the bean temperature, and the beans will have a stronger flavor but more muggy smell.

Inner pot piece

The choice of the material of the inner pot is the most tangled place when making the product. in the initial design, because the stainless steel material can be rolled up and welded, it is convenient to manufacture, while the cast iron material has a great initial investment, so stainless steel has become a very tempting choice. but after the test, it is found that the stainless steel inner pot can not evenly transfer heat to the whole inner pot, resulting in some points that will overheat and scald coffee beans. A good stainless steel pot is a composite structure, with more than three layers at the bottom, with an outer layer of stainless steel at the bottom, with a copper plate in the middle as an important heat conduction layer to disperse the uneven heat energy at the bottom of the pot, so that the internal stainless steel layer can be heated evenly. But this kind of technical solution is used in the inner pot of the roaster, we really can't do it.) (PS: the three-layer structure requires a large punch to integrate the structure and exhaust air. Moreover, what people do is a flat plate, and the roaster is an inner pot.)

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

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