Inert recyclable and biodegradable sol-gel coating barrier for paper packaging

Overview

Papkot offers a proprietary sol-gel coating technology that enables paper to perform like plastic for single-use and disposable packaging applications while preserving the inherent recyclability and biodegradability of pure paper. The coating chemically adheres to cellulose fibers, crosslinking with each molecule to create a stable barrier that breaks down only at the start of recycling or biodegradation processes. This plug-and-play solution requires no additional capital expenditure, integrating seamlessly with existing manufacturing systems. The goal is to make pure paper the next-generation packaging material—renewable, recycled, and cost-competitive with plastic.

Technical specifications

Key features:

• Proprietary sol-gel formulation that chemically crosslinks with cellulose fibers in paper
• Achieves a Water Vapor Transmission Rate (WVTR) below 1 gram per square meter per day under normal conditions (23°C, 50% relative humidity)
• WVTR of 27 grams per square meter per day under tropical conditions
• COBB 30-minute value of 0 for both grease and hot water, indicating excellent liquid and lipid barrier performance
• Improves paper WVTR barrier performance by 70% to 80%
• 99.9% recyclable and fully biodegradable at normal conditions
• Compatible with existing paper manufacturing equipment without additional capital investment
• Future development includes doping coatings with specific edible compounds to further improve tropical-condition performance

Technology readiness level

The sol-gel coating has been validated through laboratory tests and industrial trials, demonstrating effective barrier properties on paper substrates. Performance data has been confirmed for water vapor, liquid, and grease resistance. The company is currently working to further improve the Moisture Vapor Transmission Rate (MVTR) barrier while maintaining recyclability and biodegradability. Future validation will involve creating a correlation table between paper types and coating formulations, with an 18-month development timeline. The technology is positioned for continued scale-up through industrial trials and partnerships focused on paper selection, scientific support, equipment access, and personnel funding.