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Film Extrusion of Crambe abyssinica/Wheat Gluten Blends

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Published on: January 17, 2017

Comparative study of processing methods for starch/gelatin films.

Farayde M Fakhouri¹, Daryne Costa, Fábio Yamashita

¹School of Chemical Engineering, Department of Polymer Technology, State University of Campinas, UNICAMP, P.O. Box 6066, 13083-970 Campinas, SP, Brazil. farayde@yahoo.com.br

Carbohydrate Polymers

|May 8, 2013

Summary

Processing methods significantly impact bioplastic properties. Casting produced superior starch/gelatin films with better transparency and lower water vapor permeability (WVP) compared to pressing or blowing techniques.

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Area of Science:

Materials Science
Polymer Science
Food Science

Background:

Starch/gelatin films are promising biodegradable materials.
Glycerol and sorbitol are common plasticizers used to improve film flexibility.
Optimizing processing methods is crucial for enhancing bioplastic performance.

Purpose of the Study:

To investigate the effect of four different processing methods on the properties of starch/gelatin films.
To compare the performance of films produced by casting, pressing, pressing followed by blowing, and extrusion followed by blowing.
To identify optimal processing conditions for enhanced film characteristics.

Main Methods:

Four processing techniques were employed: casting, pressing, pressing followed by blowing, and extrusion followed by blowing.
Films were characterized for properties such as homogeneity, transparency, opacity, water vapor permeability (WVP), and tensile strength (TS).
Crystallinity was analyzed using thermal analysis and X-ray diffraction.

Main Results:

Cast films exhibited superior homogeneity and transparency with lower opacity and WVP compared to other methods.
Films with 3% lipophilic starch and sorbitol, processed by casting, showed the lowest WVP and highest TS.
Films processed by pressing and blowing displayed surface cracks, low TS, and high WVP, and were the only ones to exhibit crystallinity.

Conclusions:

Processing technique is a critical factor influencing the physical and mechanical properties of starch/gelatin bioplastics.
Casting is the most effective method for producing high-quality starch/gelatin films with desirable properties.
Further research can focus on tailoring processing parameters to achieve specific film functionalities for various applications.