Dual Container Cam Extraction for Twist-Free Inner Bag Separation
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Solution Overview
Problem
Existing dual containers with different material compositions for the outer shell and inner bag, or with residual contents, face difficulties in easy separation and recycling due to challenges in extracting the inner bag without leakage or twisting, especially when the inner bag is thin and difficult to handle.
Innovation Solution
The dual container design includes a mouth portion attachment that is removable, a cam mechanism for controlled extraction, and anti-slip protrusions to facilitate easy separation of the inner bag from the outer shell, while preventing unexpected twisting and allowing controlled deflation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the inner bag is made thinner to reduce material usage, then material consumption decreases, but the inner preform becomes more difficult to mold and handle
Solution Approach 1:
The dual container is divided into separate components: an outer shell and an inner bag that can be extracted. The inner bag is formed as a separate preform inserted into the outer shell preform, allowing independent optimization of each component's thickness and manufacturing parameters without compromising the other.
Solution Approach 2:
The inner preform is prepared in advance with specific structural features (such as the extraction portion and engagement structures) that facilitate subsequent extraction and handling. The preform is molded with predetermined wall thickness distribution that balances material reduction with manufacturability.
2Ease of operation
If the inner bag is extracted by pulling the cap while the cap is axially engaged with the inner bag, then the extraction process is simplified, but the inner bag may not shrink due to trapped air causing extraction difficulty
Solution Approach 1:
The cap is designed with a removable engagement structure that can be detached from the inner bag. This allows air to escape from the inner bag during extraction, enabling the bag to shrink properly. After extraction, the cap can be re-engaged with the inner bag if needed.
Solution Approach 2:
The engagement between the cap and inner bag is designed to be dynamic rather than fixed. The cap can transition between engaged and disengaged states, allowing flexibility in the extraction process to manage air pressure and facilitate bag shrinkage when required.
3Ease of operation
If the inner bag is rotated and twisted to facilitate extraction, then extraction ease is improved, but the inner bag may be accidentally twisted causing content overflow
Solution Approach 1:
The inner bag is equipped with an extraction portion or engagement structure that provides a predetermined rotation path and stopping point. This preliminary structural arrangement guides the user through controlled rotation without accidental over-twisting, maintaining content containment while facilitating extraction.
Solution Approach 2:
The engagement structure between the inner bag and outer shell provides tactile feedback during rotation. When the inner bag reaches the appropriate rotation angle for extraction, the engagement structure indicates this through mechanical feedback, preventing excessive rotation that could cause content overflow.
Data Source
AI summary
A dual container, including a container body and a mouth portion attachment. The container body includes an inner bag and an outer shell that is disposed to cover the inner bag, and the inner bag is configured to be extractable from the container body, and the mouth portion attachment is attached to a mouth portion of the inner bag and is configured to be removable from the mouth portion.