Advances in Materials Science and Engineering

Research Article

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

Table 5

Error analysis.


Number	Independent variables			Screened yield (wt%)		% Diff. of yield	Kappa number		% Diff. of kappa number	Tensile index (kN·m/kg)		% Diff. of tensile index	Burst index (kPa·m²/g)		% Diff. of burst index	Tear index (N·m²/kg)		% Diff. of tear index
Number	(%)	(°C)	(min)	Pred.	Obs.	% Diff. of yield	Pred.	Obs.	% Diff. of kappa number	Pred.	Obs.	% Diff. of tensile index	Pred.	Obs.	% Diff. of burst index	Pred.	Obs.	% Diff. of tear index

1	4	90	20	17.86	18.31	2.52	30.52	29.94	1.90	47.15	46.60	1.17	1.84	1.78	3.26	1.96	1.78	9.18
2	4	90	60	17.86	17.77	0.50	29.27	29.60	1.13	45.40	45.76	0.79	1.90	1.84	3.16	1.93	1.78	7.77
3	4	110	40	21.90	22.66	3.47	26.90	27.72	3.05	42.23	42.41	0.43	1.78	1.77	0.56	1.85	1.62	12.43
4	4	130	20	21.29	21.32	0.14	25.73	25.40	1.28	40.42	40.28	0.35	1.73	1.66	4.05	1.99	1.67	16.08
5	4	130	60	21.29	20.88	1.93	24.47	24.22	1.02	38.67	39.24	1.47	1.64	1.56	4.88	1.84	1.52	17.39
6	4.5	90	40	18.92	17.47	7.66	28.98	29.20	0.76	45.12	45.47	0.78	1.80	1.74	3.33	1.88	1.70	9.57
7	4.5	110	20	21.65	22.36	3.28	26.61	26.58	0.11	41.54	42.51	2.34	1.67	1.69	1.20	1.83	1.69	7.65
8	4.5	110	40	21.65	23.10	6.70	25.98	25.92	0.23	40.67	41.46	1.94	1.67	1.55	7.19	1.79	1.49	16.76
9	4.5	110	60	21.65	19.67	9.15	25.36	24.74	2.44	39.79	38.90	2.24	1.66	1.53	7.83	1.74	1.44	17.24
10	4.5	130	40	19.74	19.78	0.20	24.18	23.36	3.39	37.57	36.97	1.60	1.53	1.41	7.84	1.85	1.46	21.08
11	5	90	20	19.98	19.87	0.55	28.69	28.77	0.28	44.84	44.70	0.31	1.69	1.66	1.78	1.83	1.66	9.29
12	5	90	60	19.98	21.28	6.51	27.44	27.09	1.28	43.09	43.42	0.77	1.76	1.68	4.55	1.81	1.67	7.73
13	5	110	40	21.40	20.55	3.97	25.07	24.52	2.19	39.10	38.79	0.79	1.55	1.50	3.23	1.72	1.49	13.37
14	5	130	20	18.18	19.33	6.33	23.89	24.26	1.55	36.48	36.99	1.40	1.43	1.41	1.40	1.86	1.52	18.28
15	5	130	60	18.18	17.48	3.85	22.64	23.07	1.90	34.72	35.01	0.84	1.34	1.23	8.21	1.71	1.31	23.39

Average % Diff.				—	—	3.78	—	—	1.50	—	—	1.15	—	—	4.16	—	—	13.82

Note: Diff. = difference.
Obs. = observed data.
Pred. = predicted value from the model (2)–(6).