Paper-Based Lined Container With Adhesive-Free Thermoformed Corners
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Solution Overview
Problem
Lined paper-based containers face issues with structural robustness and recyclability due to weaknesses at panel intersections and the use of adhesives that contaminate recycling streams.
Innovation Solution
A container design featuring a paper-based cradle and insert with a thermoplastic film that is thermoformed to join with the cradle and insert components, providing structural integrity without adhesives, and allowing for separate recycling of paper-based materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesives are used to maintain the structure of the container, then structural integrity is improved, but recyclability deteriorates due to contamination of recycling streams
Solution Approach 1:
The invention extracts and removes adhesives from the container structure by using alternative joining methods. The thermoplastic liner is heat-sealed to the paperboard frame, and corner reinforcements are mechanically integrated, eliminating the need for adhesive bonds that would contaminate recycling streams.
Solution Approach 2:
The invention replaces the chemical bonding system (adhesives) with a thermal bonding system (heat sealing). The thermoplastic liner is heated to melt and bond to the paperboard frame, providing structural integrity through thermal-mechanical bonding instead of chemical adhesives.
2Shape
If panels meet at angles to form the container structure, then container shape is achieved, but structural robustness deteriorates at corner intersections susceptible to damage
Solution Approach 1:
The invention segments the corner region into distinct components: the paperboard frame, the thermoplastic liner, and corner reinforcement elements. This segmentation allows each component to be optimized for its specific function while working together to provide overall corner strength.
Solution Approach 2:
The invention uses composite construction at the corners by combining paperboard and thermoplastic materials. The corner reinforcements integrate both materials, creating a composite structure that leverages the rigidity of paperboard and the flexibility and bond strength of thermoplastic to resist impact and stress.
3Reliability
If a thermoplastic liner is used to protect the product, then product protection is improved, but manufacturing complexity increases due to thermoforming requirements
Solution Approach 1:
The invention uses a thin thermoplastic film as the liner material that can be easily thermoformed to conform to the container shape. This flexible film provides effective product protection while being simpler to manufacture than rigid plastic components, as it can be heat-sealed and molded in a single process.
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 design achieves robustness against environmental stress and impact while enabling convenient recyclability by maintaining the paper-based structure and allowing for separate recycling of thermoplastic film.
Implementation Method 1
a thermoplastic film inboard of said insert and joined to said brim, said bottom panel, said interior end panels, said interior side panels, said exterior end panels, said exterior side panels, said exterior corner panels, and said corner panel wings
Data Source
AI summary
A container including a paper-based cradle, a paper-based insert, and a thermoplastic film. The cradle has exterior corner panels that form a transition between the exterior end panels and exterior side panels. The cradle and insert are held together by the thermoplastic film that is thermoformed into conformance with the cradle and insert. The exterior corner panels at the junctures between the exterior end panels and exterior side panel can reduce the potential for defects in the thermoformed thermoplastic film.