Cellulosic Barrier Coating Structure for Repulpable Packaging
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Solution Overview
Problem
Existing cellulose-based paper or paperboard packaging materials lack the necessary barrier properties and are not easily recyclable, posing environmental concerns due to the use of laminated or coated materials that are not repulpable.
Innovation Solution
A cellulosic structure with a cellulosic substrate coated with a single polyolefin aqueous polymer dispersion barrier layer and at least one non-polyolefin aqueous polymer dispersion barrier layer, enhancing barrier properties while maintaining repulpability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paper or paperboard is laminated with aluminum foil, plastic film, or extrusion polymer coatings to meet barrier performance needs, then barrier properties are improved, but recyclability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the barrier coating from traditional polymers (polyethylene, polypropylene) to cellulosic-based coatings. This parameter change maintains barrier functionality while improving recyclability, as cellulosic coatings can be repulped with the paper substrate unlike synthetic polymer coatings.
Solution Approach 2:
The patent uses composite cellulosic structures combining different cellulosic materials (e.g., microcrystalline cellulose, nanocellulose, cellulose acetate) to achieve both barrier performance and recyclability. The composite nature allows optimization of barrier properties through material selection while maintaining compatibility with paper recycling processes.
2Ease of manufacture
If aqueous coatings are applied to paper or paperboard to maintain repulpability and recyclability, then ease of recycling is improved, but barrier properties deteriorate
Solution Approach 1:
The patent employs porous cellulosic structures including microcrystalline cellulose, nanocellulose, and cellulose sponges that provide barrier properties through their porous architecture. The controlled porosity allows these materials to block moisture and grease while remaining water-soluble or repulpable, thus maintaining recyclability without sacrificing barrier functionality.
Solution Approach 2:
The patent modifies the physical and chemical parameters of aqueous coatings by using advanced cellulosic derivatives with enhanced barrier capabilities. By changing the molecular structure and crystallinity of cellulosic materials, the coatings achieve improved moisture and grease resistance while retaining water solubility for recycling purposes.
3Object-affected harmful factors
If single-use plastic packaging is replaced with cellulosic materials to improve sustainability, then environmental impact is improved, but barrier properties deteriorate
Solution Approach 1:
The patent fundamentally changes the material parameters from synthetic polymers to advanced cellulosic materials with modified molecular structures. This includes using nanocellulose, microcrystalline cellulose, and cellulose acetate with controlled crystallinity and pore structure, enabling cellulosic materials to achieve barrier performance comparable to plastics while maintaining biodegradability and sustainability.
Solution Approach 2:
The patent creates composite cellulosic structures combining multiple cellulosic components (nanocellulose, microcrystalline cellulose, cellulose acetate, waxes) to achieve superior barrier properties. The composite architecture provides both the sustainability of natural materials and the functional performance previously only achievable with synthetic polymers.
Data Source
AI summary
A cellulosic substrate includes a first major side and a second major side opposed from the first major side, a single polyolefin aqueous polymer dispersion barrier layer on the first major side of the cellulosic substrate, and at least one non-polyolefin aqueous polymer dispersion barrier layer between the single polyolefin aqueous polymer dispersion barrier layer and the first major side of the cellulosic substrate.