Effects of preheating temperature, preheating time and their interaction on the sandwich structure formation and density profile of sandwich compressed wood

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 2 Effects of preheating time, temperature, and their interaction on the characteristic parameters of compressed layer

Characteristic parameters of compressed layer	Impact factor	SS	Df	MS	F	Sig.
Position	TIM	71.510	2	35.755	101.55	***
	TEM	699.434	6	116.572	331.07	***
	TIM × TEM	35.503	12	2.959	8.40	***
Thickness	TIM	7.409	2	3.704	3.54	*
	TEM	56.802	6	9.467	9.04	***
	TIM × TEM	167.737	12	13.978	13.34	***
Density	TIM	0.386	2	0.193	0.75	ns
	TEM	1.855	6	0.309	1.20	ns
	TIM × TEM	3.062	12	0.255	0.99	ns

TIM—preheating time; TEM—preheating temperature; TIM × TEM —interactions between preheating time and preheating temperature; *, **, and *** indicate significances at the p < 0.05, p < 0.01, and p < 0.001 levels, respectively; ns indicates no significant difference