Paper Cup with Integrated Folding Closure Panels for Recyclability
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Solution Overview
Problem
Paper cups with plastic lids face challenges in recyclability, user-friendliness, and liquid tightness, as plastic lids require separate recycling and precise force application for closure, and manufacturing constraints limit the choice of paperboard thickness for liquid tightness.
Innovation Solution
A paper cup design with integrated closure panels that fold inward to form a lid, allowing for a seamless, liquid-tight closure without the need for separate plastic lids, facilitating easier filling and consumption while maintaining recyclability and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate plastic lid is used to close the paper cup, then liquid tightness is improved, but recyclability deteriorates because the lid must be recycled separately from the paper cup
Solution Approach 1:
The lid is merged with the cup body by integrating closure panels directly into the paperboard structure. The closure panels are formed as integral parts of the cup sidewall, eliminating the need for separate plastic lids and enabling unified recycling of the entire cup structure.
Solution Approach 2:
The lid and cup are made from the same homogeneous material (paperboard), replacing the heterogeneous combination of paperboard cup and plastic lid. This material uniformity enables single-stream recycling while maintaining liquid tightness through the integrated closure mechanism.
2Reliability
If a plastic lid with narrow opening is used, then liquid tightness is improved, but ease of operation deteriorates because precise force application is required to close the lid properly
Solution Approach 1:
The closure mechanism is segmented into multiple independent closure panels (first and second pairs) that can be folded independently. This segmentation distributes the closing action across multiple panels with folding lines, reducing the precision required for force application compared to a single integrated lid closure.
Solution Approach 2:
The closure panels utilize dynamic folding motion along predefined folding lines to achieve closure. The panels transition from an open to closed state through controlled folding, allowing users to close the cup by simply pushing the panels along the folding lines rather than applying precise circumferential force.
3Ease of operation
If closure panels with multiple folding lines are used to enable easy folding, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The lid mechanism is divided into discrete closure panels with predefined folding lines, creating a segmented structure that is inherently simpler than a monolithic lid. Each panel folds independently along its folding lines, reducing the complexity of the overall closure mechanism while improving ease of operation.
Solution Approach 2:
Instead of using a complex mechanical locking mechanism to achieve secure closure, the invention inverts the approach by using simple folding lines that guide the panels into a locked closed position through their own geometry. The complexity is inverted from active mechanical components to passive geometric constraints.
Data Source
AI summary
According to an example aspect of the present invention, there is provided a paper cup comprising: a base; a sidewall; said base and said sidewall together defining a space for receiving liquid or food; an upper end portion of the cup comprising a first and second pair of opposing closure panels, whereby each panel is attached to an upper edge of the sidewall via a respective first folding line and to adjacent panels via respective second folding lines. Said panels are foldable into a closed position to form a lid of the cup. Each panel of said first pair contains two additional folding lines to enable folding inwards. Upon folding to the closed position, a first panel of said second pair is partly inserted below a second panel of said second pair, and the panels of said second pair close the upper end portion.