Table 1.

Design and results of the experiment

Run	Factors			Response
	x1(g)	x 2	x3(s)	HRY/%	WI	Es/kJ/kg	DOM %	TR/°C
1	95(− 1)	1.4(− 1)	30(− 1)	79.35	48.73	54.29	6.30	17.50
2	345(+ 1)	1.4(− 1)	30(− 1)	75.55	52.29	57.14	9.13	22.90
3	95(− 1)	2.6(+ 1)	30(− 1)	80.05	46.66	30.15	5.19	16.10
4	345(+ 1)	2.6(+ 1)	30(− 1)	78.99	50.86	43.69	8.61	17.60
5	95(− 1)	1.4(− 1)	100(+ 1)	65.42	52.78	108.29	8.92	29.40
6	345(+ 1)	1.4(− 1)	100(+ 1)	60.74	53.57	116.79	11.00	30.20
7	95(− 1)	2.6(+ 1)	100(+ 1)	70.96	52.16	75.88	9.04	27.80
8	345(+ 1)	2.6(+ 1)	100(+ 1)	58.51	53.95	97.19	11.88	32.20
9	10(− 1.682)	2(0)	65(0)	75.96	50.88	59.00	7.65	21.80
10	430(+ 1.682)	2(0)	65(0)	67.31	52.39	64.50	10.30	22.60
11	220(0)	1(− 1.682)	65(0)	69.34	53.25	94.10	9.40	20.30
12	220(0)	3(+ 1.682)	65(0)	70.12	52.64	57.43	10.60	23.50
13	220(0)	2(0)	6(− 1.682)	84.12	45.07	12.40	2.95	8.50
14	220(0)	2(0)	124(+ 1.682)	58.67	53.82	114.15	11.10	34.50
15	220(0)	2(0)	65(0)	71.37	52.71	71.00	9.80	25.40
16	220(0)	2(0)	65(0)	69.79	53.04	73.85	10.00	25.20
17	220(0)	2(0)	65(0)	72.61	51.81	81.75	10.45	23.60
18	220(0)	2(0)	65(0)	70.51	53.11	77.40	10.65	25.30
19	220(0)	2(0)	65(0)	68.56	52.84	72.85	10.40	26.20
20	220(0)	2(0)	65(0)	72.12	51.24	83.05	9.95	26.50
21	220(0)	2(0)	65(0)	68.61	53.10	73.60	9.75	26.40
22	220(0)	2(0)	65(0)	68.63	52.81	76.65	8.90	24.20
23	220(0)	2(0)	65(0)	72.31	52.30	78.75	9.55	26.10

x₁ milling weight, x₂ filling ratio, x₃ milling duration, HRY head rice yield, WI whiteness index, Es specific energy consumption, DOM degree of milling, TR temperature rise