Why is the tumbler vacuum?
The vacuum in the tumbler has many benefits:
The first is to make the product roll under vacuum, which will make the physical volume of the product large and soft. Make the product taste better.
Second, the product rolling under vacuum will reduce the heat generated when the product is rubbed or beaten. And the product does not oxidize under vacuum. Therefore, the product will not deteriorate during the rolling process.
Third, the physical structure of the product under vacuum is bulky, which is beneficial to the absorption of excipients.