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

Table 3

Gloss value and haze index of the laminated paperboard.

Pc*/Ga**	Gloss unit
	0 wt.% OA	25 wt.% OA	50 wt.% OA	75 wt.% OA
20/𝐺^20	8.3±0.5	5.3±0.4	8.9±1.6	14.4±1.9
20/𝐺^60	44.6±1.8	32.0±1.3	35.3±2.2	41.2±2.7
20/Haze index***	34.4±1.3	26.6±0.9	26.4+1.2	26.8±1.9
30/G ^20	7.2±2.0	3.0±0.2	8.0±3.8	11.4±1.7
30/G ^60	40.4±7.2	21.2±1.2	32.2±6.7	39.0±2.6
30/Haze index	33.2±5.2	18.2±1.1	24.2±3.4	27.6±1.0

*The total plasticizer content in the coated paperboard (wt.%).
** Gloss^angle(∘): the reflectance measured at angles of 20° and 60°.
***Haze index defined as difference in gloss values measured at angles of 60° and 20°  (𝐻=𝐺⁶⁰−𝐺²⁰).