Influence of Soda Pulping Variables on Properties of Pineapple (Ananas comosus Merr.) Leaf Pulp and Paper Studied by Face-Centered Composite Experimental Design

Table 4

Statistical analysis of reduced models and coefficient of screened yield, kappa number, tensile index, burst index, and tear index.

Term	Screened yield (wt%)		Kappa number		Tensile index (kN·m/kg)		Burst index (kPa·m^2/g)		Tear index (N·m^2/kg)
	CE	value	CE	value	CE	value	CE	value	CE	value
Constant		0.000	66.8272	0.000	77.5763	0.000	1.0837	0.000	4.6060	0.000
	13.8739	0.326		0.000	1.3723	0.000	0.1954	0.002		0.000
	1.8840	0.105		0.000		0.000	0.0145	0.003		0.000
	—	—		0.000		0.000	0.0107	0.002	0.0066	0.000
	—	—	—	—	—	—	—	—	—	—
		0.000	0.0015	0.005	0.0017	0.015	—	—	0.0002	0.001
	—	—	—	—	—	—	—	—	—	—
		0.000	—	—		0.023		0.003	—	—
	—	—	—	—	—	—	—	—	—	—
	—	—	—	—	—	—		0.001		0.012
Regression	—	0.000	—	0.000	—	0.000	—	0.000	—	0.000
Lack-of-fit	—	0.103	—	0.000	—	0.001	—	0.037	—	0.001
-Sq (%)	69.6		95.8		97.0		93.6		87.3
Adj. R-Sq (%)	64.7		95.1		96.4		92.3		84.6

Note: CE = coefficient.