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An optimum concentration of coating solution for improving water resistance of paperboard is _____

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in Food Packaging Technology by (63.0k points)
An optimum concentration of coating solution for improving water resistance of paperboard is _____

(a) 1.5 w/v%

(b) 2.5 w/v%

(c) 3 w/v%

(d) 1 w/v%

This question was addressed to me in an online interview.

I'm obligated to ask this question of Paper Making topic in portion Paper and Paper Based Packaging Materials of Food Packaging Technology

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Correct answer is (c) 3 w/v%

Explanation: An optimum concentration of coating solution for improving water resistance of paperboard was 3 w/v %. It gives a coating thickness of 28 μm equivalent to 49.5 GSM. There is an increase in the water resistance of paperboard when it is coated with PLA. A coating thickness between 4.7 to 42.7 μm decreases water vapor permeability from 4.8 to 25.5 times, while decreasing water absorptiveness from 11.9 to 17.9 times.

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