*2.1. Test Materials and Their Basic Physical Characteristics*

Hazelnuts are widely grown in the mountainous area of Liaoning, and in this study, Liaoning hazelnut No. 3 grown in Huanren, Liaoning, was used as the sample. These samples were harvested in September 2022 with a cumulative sample size of 20 kg. The instrument used for the moisture content determination test of hazelnuts and their mixes was the JH-H5 moisture dryer, and the experimental results showed that the water content of hazelnut was 7.47% and the water content of the leaves was 0.53%. The mixture was

classified into two states, hazelnut and leaf, using an electronic balance (BS200S-MEI) and a statistical classification.

The mass and size of the hazelnuts were measured, and according to the measurements it can be concluded that the mass of hazelnuts is between 2 g and 3 g in 70% of fruit. The volumes of hazelnuts were measured, and they can be considered as round; the diameter distribution was between 23 mm and 30 mm in 83% of fruit. Hazelnut harvesters also have leaves mixed in during the harvesting process, as shown in Figure 1.

**Figure 1.** Hazelnut, mixed sample chart: (**a**) hazelnut; (**b**) leaves.
