Double Container Inner Bag Separation Mechanism
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Solution Overview
Problem
Existing double containers with outer shells and inner bags made of different materials, or with content adhered to the inner bag, pose challenges in recycling as they are difficult to separate effectively.
Innovation Solution
A double container design featuring a container body with an outer shell and an inner bag, where the mouth part is laminated with both components, and the inner bag includes a flange part with a pull-out part that allows easy removal from the outer shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inner bag and outer shell are molded together by biaxially stretching blow molding, then the container structure is integrated and strong, but the inner bag cannot be easily separated from the outer shell for recycling
Solution Approach 1:
The invention divides the container structure into separable components by introducing a pull-out part on the flange that can be grasped and pulled to separate the inner bag from the outer shell. The flange with pull-out part acts as a segmentation feature that allows manual separation while maintaining the integrated molded structure during use.
Solution Approach 2:
The pull-out part serves as an intermediary element between the user's hand and the inner bag structure. By providing this intermediate grasping feature, the invention enables easy separation without requiring direct manipulation of the bonded interface between inner bag and outer shell.
2Adaptability or versatility
If the inner bag is made to contract as content is reduced, then the container adapts to content volume, but the inner bag adheres to the outer shell making separation difficult
Solution Approach 1:
The invention prepares for separation in advance by providing the pull-out part on the flange before separation is needed. This preliminary structural feature ensures that when separation is required, the user can immediately grasp and pull the pull-out part without needing to create a separation mechanism during the separation act itself.
Solution Approach 2:
The invention extracts the separation function from the bonded interface between inner bag and outer shell by introducing a dedicated pull-out part. This extracted separation feature can be independently manipulated to achieve separation without affecting the adaptive contraction function of the inner bag.
3Reliability
If the mouth part is configured by lamination of outer shell and inner bag, then the sealing function is improved, but the complexity of separation increases
Solution Approach 1:
The invention applies local quality by providing the pull-out part only at the flange region of the inner bag, while the rest of the inner bag maintains its laminated structure with the outer shell for sealing. This localized separation feature simplifies the overall separation process without compromising the sealing function of the laminated mouth part.
Data Source
AI summary
Provided is a double container in which an inner bag can be easily removed from an outer shell.A double container according to the present invention comprises a container body having an outer shell and an inner bag, wherein: a mouth part of the container body is configured by lamination of the outer shell and the inner bag; the inner bag comprises a flange part at an upper end thereof in the mouth part, the flange part covering the upper end of the outer shell from above; and the flange part comprises a pull-out part for pulling the inner bag out of the outer shell.