Central Composite Design of Spraying Process to Laminate the Paper Substrates with Cellulose Nanofibers (CNF) as Green Packaging Wrap

Table 8

Response 3: air permeability.

Source	Sum of squares	df	Mean square	value	value
Model	7.83	9	0.8695	29.70	≤0.0001	Significant
: suspension concentration	4.78	1	4.78	163.16	≤0.0001
: fiber diameter	0.0047	1	0.0047	0.1596	0.6980
: distance between spray gun and surface	0.0038	1	0.0038	0.1311	0.7249
	0.0087	1	0.0087	0.2966	0.5979
	0.0098	1	0.0098	0.3361	0.5749
	0.0020	1	0.0020	0.0673	0.8005
	2.98	1	2.98	101.79	≤0.0001
	0.0001	1	0.0001	0.0021	0.9646
	0.0025	1	0.0025	0.0856	0.7759
Residual	0.2928	10	0.0293
Lack of fit	0.2928	5	0.0586
Pure error	0.0000	5	0.0000
Cor total	8.12	19

Factor coding is coded. Sum of squares is type III-partial.