Table 3.

Outline comparing dry and wet methods of film formation [187].

Sl. No.	Type of Method	Film Formation	Advantage	Disadvantage	Application
1.	Solvent casting method (Wet)	Biomaterial is dissolved in suitable solvent (e.g., ethanol, hexane) then cast into a mold followed by drying.	Low cost, ease of operation, fewer defects in film (homogeneous packaging), good optical purity, transparency, excellent flatness, and isotropic orientation.	Limitation of shapes, entrapment of toxic solvent in polymer, long drying period.	Apples, strawberries, quail eggs, cheese slices, etc.
2.	Extrusion method (Dry)	Biomaterial is mixed with solvent and then feed with the help of compressed air; it is then kneaded and heated in the machine, followed by the formation of the finished film.	Short duration of heating, low energy consumption, good mechanical, and optical properties, cheap and highly efficient, no use of solvent.	Can process materials that can tolerate high temperatures; high investment, and maintenance cost.	Mangos, soyabean oil, sausage