Research on Recovery Mechanism and Process of Waste Thermosetting Phenolic Resins Based on Mechanochemical Method

Table 2

Coding and level of the experimental independent variable factor.

Factor	Coding value (xi) and level of the independent variable
	−1	0	1
X1 speed (r/min)	2000	2500	3000
X2 time (min)	60	90	120
X3 feed size (mm)	0.425	0.85	1.275
X4 feed volume (g)	50	60	70