Table 1.

Orthogonal experimental design.

Column	1	2	3	4
Factor	Ultrasonic time/min	Ultrasonic power/W	Mass ratio	Control
1	5	100	1:200	1
2	5	200	1:300	2
3	5	300	1:400	3
4	10	100	1:300	3
5	10	200	1:400	1
6	10	300	1:200	2
7	15	100	1:400	2
8	15	200	1:200	3
9	15	300	1:300	1