Active Clay Polymer Coating for Freshness-Preserving Paper Packaging
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Solution Overview
Problem
Existing food packaging made from paper and cardboard lacks effective antimicrobial and antioxidant properties, is susceptible to water and grease, and often compromises recyclability and compostability, limiting its sustainability and shelf-life extension capabilities.
Innovation Solution
A process involving a cellulosic support coated with a polymer resin layer, where anionic clays are dispersed and intercalated with active molecules such as antimicrobials and antioxidants, providing a thickness of 3 to 10 microns and viscosity between 30 to 90 seconds, ensuring uniform dispersion and effective action on food.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paper and cardboard are used for food packaging, then the packaging is lightweight, renewable, and recyclable, but it lacks effective antimicrobial and antioxidant properties and is susceptible to water and grease
Solution Approach 1:
The patent applies composite materials by combining cellulosic support (paper or cardboard) with a polymer resin coating layer. This composite structure integrates the environmental benefits of paper with the protective properties of polymer resins, creating a material that is both sustainable and resistant to water, grease, and microbial degradation.
Solution Approach 2:
The patent modifies the surface properties of paper and cardboard by applying a polymer resin coating. This changes the physical and chemical parameters of the material, including water resistance, grease resistance, and antimicrobial properties, while maintaining the base material's recyclability and compostability.
2Object-affected harmful factors
If plastic coatings are applied to improve water and grease resistance, then the protective properties are enhanced, but recyclability and compostability are compromised
Solution Approach 1:
The patent uses a thin polymer resin coating (3-10 microns) that provides adequate water and grease resistance while minimizing the amount of plastic material used. This thin coating approach maintains recyclability and compostability compared to thicker plastic layers that would completely compromise these properties.
Solution Approach 2:
The patent employs a thin film polymer resin coating (3-10 microns thick) on the cellulosic support. This thin film provides the necessary protective barrier against water and grease while using minimal plastic material, thereby preserving the recyclability and compostability of the underlying paper or cardboard.
3Reliability
If multiple layers of different materials are combined to maintain shape and protect freshness, then the functional benefits are improved, but the complexity of the packaging structure increases
Solution Approach 1:
The patent creates a composite material system where a polymer resin coating is applied to cellulosic support. This single composite structure simultaneously provides shape maintenance, water resistance, grease resistance, and freshness protection, eliminating the need for multiple separate layers of different materials.
Solution Approach 2:
The polymer resin coating layer serves multiple functions simultaneously: it provides water resistance, grease resistance, antimicrobial protection, antioxidant properties, and structural support for shape maintenance. This multi-functional approach simplifies the packaging structure compared to using separate layers for each function.
4Object-affected harmful factors
If fine plastic coatings are used to improve gas barrier and water repellence, then the protective properties are enhanced, but the amount of plastic material increases
Solution Approach 1:
The patent applies a thin film polymer resin coating with a thickness of only 3-10 microns. This thin film provides effective gas barrier and water repellence properties while using a minimal quantity of plastic material, thereby reducing plastic consumption compared to thicker coatings.
Solution Approach 2:
The patent optimizes the coating thickness parameter to 3-10 microns, which is sufficient to provide effective gas barrier and water repellence properties. This parameter optimization ensures adequate protective performance while minimizing the quantity of plastic material used in the coating.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The packaging maintains food freshness, inhibits bacterial growth, and extends shelf-life while being recyclable and compostable, offering a sustainable and industrially viable solution.
Implementation Method 1
a polymer resin layer in which anionic clays are dispersed, intercalated with active molecules
Implementation Method 2
anionic clays are dispersed, intercalated with active molecules selected from the group consisting of antimicrobials, antioxidants, antifungals
Data Source
AI summary
The present invention concerns a process for the production of packaging for the preservation of food products, the packaging thus obtained consisting of a cellulosic support such as, for example, paper or cardboard, coated with a layer of preferably acrylic or styrene/acrylic polymer resin, in which anionic clays are dispersed, preferably hydrotalcite, intercalated with active molecules.