Improving paper-based packaging with home compostable modified starch coatings: a focus on heat seal optimization

Area of Science:

• Materials Science
• Sustainable Chemistry
• Food Packaging Technology

Background:

• Traditional paper-based food packaging faces challenges with heat sealability, limiting sustainable alternatives.
• Developing home-compostable materials that meet performance requirements is crucial for reducing packaging waste.

Purpose of the Study:

• To develop and optimize home-compostable coatings for paper-based flexible food packaging.
• To enhance the heat sealability of sustainable packaging materials.
• To investigate the relationship between coating composition and sealing performance.

Main Methods:

• Utilized sodium starch octenyl succinate (SSOS) and maltodextrin (MAL) as compostable starch derivatives.
• Incorporated sorbitol (SOR) and glycerol (GLY) as plasticizers to modify coating properties.
• Employed central composite design (CCD) and response surface methodology (RSM) for optimization.

Main Results:

• Achieved significantly low seal initiation temperature (SIT) and fiber tear temperature (FTT) with optimized formulations.
• Optimal SSOS formulation (10% SOR, 20% GLY) yielded SIT of 120°C and FTT of 147°C.
• Optimal MAL formulation (20% SOR, 5% GLY) yielded SIT of 112°C and FTT of 125°C.
• Statistical models showed high predictive accuracy (R² > 0.85) and precision (CV < 7.4%).

Conclusions:

• Developed high-performance, home-compostable coatings for paper packaging.
• Demonstrated a scalable method to improve heat sealability of sustainable packaging.
• Paved the way for reduced environmental impact in food packaging without compromising functionality.