Biodegradable Wax Coating for Cellulose Substrate Gas Tightness
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Solution Overview
Problem
Current cellulose-based packaging materials, such as molded pulp and paper, face challenges in achieving adequate gas-tightness and water resistance, especially for food packaging, which affects the shelf life and aroma preservation of contents like coffee, and often require non-biodegradable materials for effective sealing.
Innovation Solution
A biodegradable second coating predominantly composed of animal and/or vegetable waxes and/or lipids is applied over a first coating of cellulose nanofibrils or microfibrils, enhancing the gas-tightness and water resistance of cellulose substrates, using a mixture of linseed oil, carnauba wax, and beeswax to create a flexible and impermeable layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cellulose substrates are coated with cellulose fibrils to improve gas-tightness, then the gas-tightness is enhanced, but water resistance and adequate sealing still require additional non-biodegradable materials
Solution Approach 1:
The patent applies a multi-layer coating system combining cellulose fibrils (first coating) with biodegradable polymer and wax mixture (second coating). This composite structure achieves both gas-tightness and water resistance using entirely biodegradable materials, eliminating the need for non-biodegradable sealing materials while maintaining packaging performance.
2Object-affected harmful factors
If non-biodegradable polymers like polyethylene are used to achieve water resistance and sealing, then water resistance is improved, but environmental friendliness and biodegradability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the coating materials from synthetic polymers to natural biodegradable alternatives. The second coating uses a specific formulation of biodegradable polymer (30-70% by weight) combined with natural waxes (30-70% by weight), achieving water resistance through this natural composition rather than synthetic polymers like polyethylene.
Solution Approach 2:
The patent applies different materials with specific local functions: the first coating (cellulose fibrils) provides gas-tightness, while the second coating (biodegradable polymer and wax mixture) provides water resistance. Each layer is optimized for its specific function, achieving both protections using biodegradable materials.
3Object-generated harmful factors
If biodegradable polymers like polylactic acid are used instead of polyethylene, then environmental friendliness is improved, but the coating effectiveness and water resistance may be reduced
Solution Approach 1:
The patent creates a composite second coating by combining biodegradable polymer with natural waxes (such as carnauba wax, beeswax, or palm wax). This combination compensates for the lower water resistance of pure biodegradable polymers, achieving effective water protection while maintaining biodegradability. The wax components provide enhanced hydrophobicity and water barrier properties.
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 solution provides a highly effective, environmentally friendly, and recyclable packaging system that significantly increases the shelf life of food products by ensuring gas-tightness and water resistance, while being suitable for various applications including coffee capsules and disposable cutlery.
Implementation Method 1
a second waterproof coating, composed predominantly of animal and/or vegetable waxes and/or lipids, is applied to a first coating
Implementation Method 2
increasing the gas-tightness and water resistance of cellulose substrates
Data Source
AI summary
In a method for the production of coated substrates, a flowable, biologically degradable first coating which enhances gas tightness is applied to a cellulose-containing substrate. To obtain a packaging consisting only of natural components and offering good tightness, a second watertight coating made of animal and/or vegetable waxes and/or lipids is applied to the first coating.