Biodegradable Multilayer Food Mold for Moisture-Resistant Rigidity
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Solution Overview
Problem
Conventional food molds, whether made of aluminum or paper-based with plastic coatings, are not biodegradable, pose safety issues in microwave ovens, and lose shape due to moisture, failing to meet the requirements of being compostable and suitable for use in production lines with metal detectors.
Innovation Solution
A multilayer article comprising a non-woven layer of biodegradable polymer fibers with a melting point below 220°C, a food-safe adhesive, and a cellulose-fiber based support, which maintains shape and rigidity even in moist conditions, and is entirely biodegradable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If aluminum foil is used for food molds, then rigidity and shape stability are improved, but biodegradability deteriorates
Solution Approach 1:
The patent uses a composite structure consisting of a cellulose-fiber based support layer combined with a biodegradable polymer coating layer. The cellulose base provides structural integrity and shape stability, while the biodegradable polymer coating provides the necessary surface properties. This composite approach allows the mold to maintain rigidity without using aluminum, and both layers are biodegradable, resolving the contradiction between shape stability and biodegradability.
2Object-generated harmful factors
If paper-based molds are used, then biodegradability is improved, but resistance to moisture deteriorates
Solution Approach 1:
The patent employs a composite structure where a cellulose-fiber based support is combined with a biodegradable polymer coating. The polymer coating layer provides moisture resistance to the inherently moisture-sensitive cellulose base, while both materials remain biodegradable. This resolves the contradiction by providing moisture protection without sacrificing biodegradability.
3Reliability
If PET coating is applied on paper-based molds, then moisture resistance is improved, but biodegradability deteriorates
Solution Approach 1:
The patent changes the material parameter of the coating from conventional non-biodegradable PET to biodegradable polymers such as polylactic acid (PLA), polyhydroxyalkanoates (PHA), or starch-based polymers. This parameter change maintains the moisture resistance function while achieving biodegradability, thus resolving the contradiction between moisture resistance and biodegradability.
4Strength
If aluminum is used in molds, then rigidity is improved, but compatibility with microwave ovens and metal detectors deteriorates
Solution Approach 1:
The patent extracts and eliminates the aluminum component from the mold structure entirely, replacing it with aluminum-free materials consisting of cellulose fiber support and biodegradable polymer coating. This removal of metal content resolves the contradiction by providing sufficient rigidity through the composite structure while ensuring compatibility with microwave ovens and metal detectors.
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 food accessory or mold that retains its shape and rigidity, is suitable for use in damp conditions, and is fully biodegradable, addressing the limitations of existing molds by ensuring compostability and safety in microwave ovens and metal detector-compatible production lines.
Implementation Method 1
a non-woven layer of fibers comprising at least 50% by weight of at least one biodegradable polymer melting point of which is below 220°C
Implementation Method 2
a layer of food-safe adhesive
Data Source
Figure 1~2
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AI summary
Invention relates to a multilayer article comprising successively: a non-woven layer of fibers (3) comprising at least 50% by weight of at least one biodegradable polymer melting point of which is below 220°C; a layer of food-safe adhesive (2); a cellulose-fiber based support (1 ).