Recloseable Cup Lid Reinforcement for Hot-Drink Stiffness
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Solution Overview
Problem
Conventional drink lids made from materials like polystyrene lack the necessary stiffness and heat resistance for hot food service applications, leading to flexing and potential unseating from cups, especially when used with hot beverages, and alternative materials like polyolefins and polylactic acid-based lids exhibit similar issues.
Innovation Solution
Incorporation of reinforcement structures into drink lids, particularly those made from polyolefin-based materials, to enhance stiffness and reduce flexing, allowing for effective engagement of the drink opening plug with the plug retainer and enabling recyclability through reduced density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alternative materials like polyolefins and polylactic acid are used to replace polystyrene in drink lids, then recyclability is improved, but stiffness and heat resistance deteriorate
Solution Approach 1:
The patent employs composite material construction by combining polyolefin base material with reinforcement structures (such as ribs, gussets, or internal support elements) to achieve both recyclability and enhanced mechanical properties. The reinforcement structures create a composite system where the polyolefin provides recyclability while the added structural elements restore stiffness and heat resistance comparable to polystyrene.
2Strength
If reinforcement structures are added to polyolefin-based lids, then stiffness is improved, but device complexity increases
Solution Approach 1:
The reinforcement structures are segmented into discrete elements such as radial ribs, circumferential gussets, or modular support features distributed strategically across the lid body. This segmentation allows each reinforcement element to perform its stiffening function independently while maintaining manufacturability through standard molding techniques, thus limiting the increase in device complexity.
Solution Approach 2:
Reinforcement structures are applied locally at specific high-stress areas of the lid (such as around the drink opening, near the rim, or at plug retainer locations) rather than uniformly throughout the entire lid. This localized approach provides necessary stiffness where required while minimizing overall structural complexity and material usage in low-stress regions.
3Reliability
If the lid structure is strengthened to prevent unseating, then reliability is improved, but ease of operation deteriorates
Solution Approach 1:
The lid incorporates flexible reinforcement structures (such as elastomeric ribs or compliant gussets) that can elastically deform during plug insertion and retrieval operations. These flexible elements provide strong mechanical support to prevent unseating under normal use while allowing temporary deflection during consumer interaction, thus maintaining ease of operation. The flexibility enables the structure to absorb insertion forces without creating excessive resistance or requiring excessive assembly force.
Data Source
AI summary
A recloseable lid for closing an open top of a cup terminating in an annular upper edge includes a cup mount defining an annular channel configured to receive the annular upper edge of the cup and a cap having an annular side wall extending upwardly from the cup mount and terminating in a top having an annular floor spaced above the cup mount. A drink opening is disposed in the top and a plug assembly having a drink opening plug is provided. The drink opening plug can be selectively moveable between a closed position in which the drink opening plug is received within the drink opening for closing the drink opening and an open position in which the drink opening plug is not disposed within the drink opening. The lid can also include a plug retainer disposed in the cap and configured to retain the drink opening plug in the open position.