Wheat Gluten-Laminated Paperboard with Improved Moisture Barrier Properties: A New Concept Using a Plasticizer (Glycerol) Containing a Hydrophobic Component (Oleic Acid)

Table 1

Water vapor transmission rate and surface water absorption.

Plasticizer content (wt.%)	Specific water vapor transmission rate (g·mm/(m^2·day))
	Paperboard	0 wt.% OA	25 wt.% OA	50 wt.% OA	75 wt.% OA
20	UH*	400±41 ab	260±5 de	199±11 def	123±6 f
30		477±41 a	370±16 bc	275±44 cd	164±8 ef
	Cobb60 water absorbency (g/m^2)
20	24.3±0.3 e**	42.5±1.1 b	32.1±0.5 c	28.0±0.4 d	28.4±0.7 d
30		48.4±1.0 a	33.6±1.2 c	28.9±0.6 d	24.3±0.1 e

The results are given with the average value, standard deviation, and significance letter.
*UH: immeasurably high.
**The values having the same letters are not significantly different. Statistics were carried out using the Tukey-Kramer HSD test at a significance level of 0.05.