Rotating Snack Tray Lid for Spill-Resistant Dispensing
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Solution Overview
Problem
Thermoformed plastic containers often fail to maintain closure during storage and transport, leading to spills of contents due to weak interference fits or tab connections, especially when containing liquids or semi-liquids.
Innovation Solution
A thermoformed plastic dispensing container with a disc-shaped lid that rotates within a circular radial side wall portion, featuring a door that aligns with a gap to allow controlled dispensing and reclosure, utilizing an interference fit and groove system for secure sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an interference fit or tab connection is used to hold the cover on the base, then the container can be assembled, but the connection fails during storage or transportation causing spills
Solution Approach 1:
The lid is designed to rotate within the circular radial side wall portion, transitioning from a static sealed position to a dynamic dispensing position. This rotational movement allows the container to adapt between secure closure and controlled dispensing states, resolving the contradiction between maintaining strong connection and enabling controlled opening.
Solution Approach 2:
The circular radial side wall portion with gap acts as an intermediary mechanism between the lid and base. It provides both the rotational guidance and the dispensing aperture, mediating between the need for secure closure and controlled material flow without requiring separate mechanisms.
2Ease of operation
If the container is designed for controlled dispensing, then materials can be dispensed, but the seal integrity is compromised leading to spills
Solution Approach 1:
The rotating lid mechanism dynamically adjusts the seal integrity based on operational needs. When rotated to align the door with the gap, controlled dispensing is enabled; when rotated away, full seal integrity is restored. This dynamic state change allows the system to achieve both dispensing control and seal integrity at different times without compromise.
Solution Approach 2:
The seal integrity is maintained locally at the interface between the lid and circular radial side wall portion, while the door area provides the controlled dispensing function. This local differentiation allows different regions of the lid to serve different functions - sealing and dispensing - simultaneously resolving the contradiction between seal integrity and dispensing control.
3Ease of operation
If a flap is used to cover the opening, then dispensing can be controlled, but the interference fit fails causing the flap to detach and spill contents
Solution Approach 1:
Instead of a static flap that relies on interference fit, the invention uses a rotating lid mechanism that actively controls the dispensing opening. The rotational movement provides controlled access while the engagement with the circular radial side wall portion maintains strong attachment, eliminating the detachment problem of traditional flaps.
Solution Approach 2:
The invention replaces the simple flap interference fit mechanism with a more sophisticated rotational engagement system. The lid rotates within the circular radial side wall portion, providing both secure attachment and controlled dispensing through mechanical guidance rather than relying solely on interference fit, thereby resolving the attachment strength issue.
Data Source
AI summary
A thermoformed dispensing container comprises a plastic tray with a dispensing cavity having side walls that include a circular radial side wall portion with a gap, and a disc-shaped thermoformed plastic lid positioned for rotation within the circular radial side wall portion of the tray, the lid having side walls that include a door. The dispensing container can be placed in an open condition by rotating the lid to align the door of the lid with the gap of the tray, or in a closed position by moving the door of the lid away from the gap of the tray.