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Polymers used for packaging films must have a surface energy – _______

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Polymers used for packaging films must have a surface energy – _______

(a) 5-25 mNm^-1

(b) 29-45 mNm^-1

(c) 45-55 mNm^-1

(d) 10-25 mNm^-1

I got this question in an online interview.

This is a very interesting question from Coating and Laminating in Thermoplastics in chapter Thermoplastic Polymers Properties & Processing of Food Packaging Technology

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Right answer is (b) 29-45 mNm^-1

The explanation: Polymers used for packaging films must have a surface energy- 29-45 mNm^-1. The standard is set by ASTM. Also, the surface energy of the substrate should be 7-10 mNm^-1 higher than the surface tension of coating being applied.

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