Recyclable Thermoformable Sheet for Complex Package Shapes
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Solution Overview
Problem
Conventional thermoformable sheets used for making thermoformed packages with complicated shapes are non-recyclable, posing environmental sustainability challenges due to contamination in recycling streams and lack of thermoformability for intricate designs.
Innovation Solution
A recyclable thermoformable sheet composed of polyolefin-based polymers with a high-density polyethylene inner layer, a printed pigment layer, an adhesive layer, and an interior sealing layer, allowing thermoforming into complex shapes while maintaining recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional thermoformable sheets (thick polystyrene film or polyester film) are used to achieve complicated shapes, then thermoformability is improved, but recyclability deteriorates
Solution Approach 1:
The patent applies composite materials by creating a multi-layer structure where the outer layer is a recyclable polyolefin-based polymer and the inner layer is a different polymer material. This composite structure enables the package to achieve complicated thermoformed shapes while the outer recyclable layer ensures environmental sustainability and ease of recycling, resolving the contradiction between shape complexity and recyclability
Solution Approach 2:
The patent changes the material parameter from conventional non-recyclable polymers (polystyrene, polyester) to recyclable polyolefin-based polymers for the outer layer. This parameter change maintains the necessary thermoformability for complicated shapes while fundamentally improving recyclability, as polyolefins are widely accepted in recycling streams
2Object-generated harmful factors
If the inner layer thickness is increased to 100-350 microns to ensure recyclability and provide structural integrity, then material purity is improved, but weight increases
Solution Approach 1:
The patent applies local quality by differentiating the thickness and material properties of different layers: the outer layer is thinner (optimized for recyclability and shape) while the inner layer is thicker (100-350 microns) specifically where structural integrity and recyclability are needed. This localized optimization ensures the inner layer provides sufficient purity and strength without unnecessarily increasing the overall weight of the entire package structure
3Reliability
If multiple layers (printed pigment layer, adhesive layer, inner layer, interior sealing layer) are added to achieve desired functionalities, then product performance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functionalities into an integrated multi-layer structure where the printed pigment layer provides branding and UV protection, the adhesive layer bonds layers together, the inner layer ensures recyclability and structural integrity, and the interior sealing layer provides sealing and barrier functions. This merging of functions into a cohesive structure improves overall product performance while managing complexity through functional integration rather than separate components
Solution Approach 2:
The patent applies multi-functionality to each layer: the outer polyolefin layer serves as both the structural shell and the recyclable component, the inner layer provides both structural support and recyclability assurance, and the adhesive layer not only bonds but also facilitates recycling by being compatible with polyolefin recycling streams. This multi-functionality reduces the need for additional specialized components, managing overall system complexity
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 sheet achieves high-quality thermoformability into complicated shapes with minimal defects, is free of contaminants in recycling, and promotes environmental sustainability by being fully recyclable.
Implementation Method 1
the thermoformable sheet may be thermoformed into the thermoformed package having complicated curved forms and sharp-edged shapes
Implementation Method 2
The exterior film may provide a substrate for reverse printing. The printed pigment layer may be deposited directly on the exterior film
Implementation Method 3
The adhesive layer may include a recyclable adhesive, such as a plastomer adhesive
Implementation Method 4
The interior sealing layer may provide desired functionalities and properties to the thermoformable sheet, such as, peelability, barrier properties, seal initiation temperature
Data Source
AI summary
A thermoformable sheet includes an exterior film, a printed pigment layer, an adhesive layer, an inner layer, and an interior sealing layer. The exterior film includes between 50% and 100% polyolefin-based polymers, by weight. The inner layer includes between 60% and 100% of high-density polyethylene polymer, by weight. The inner layer further includes a thickness between 100 microns and 350 microns. The printed pigment layer and the adhesive layer are located between the exterior film and the inner layer.