Hard Container Structure for Flexible Inner Bag Contraction
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Solution Overview
Problem
Delaminatable containers with attached suction devices often fail to appropriately discharge or spray content due to insufficient flexibility of the inner bag, leading to inappropriate contraction.
Innovation Solution
A resin-made hard container with an outer shell having an EVOH layer and an inner bag without an EVOH layer, ensuring flexibility and maintaining gas barrier properties, combined with an elastic modulus gradient of 20 N/mm or above, to facilitate appropriate discharge or spraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer shell is made hard for attachability enhancement, then the attachability of the suction device is improved, but the flexibility of the inner bag becomes insufficient leading to inappropriate contraction
Solution Approach 1:
The container is divided into two distinct parts: an outer shell and an inner bag. The outer shell provides hardness for structural support and attachability, while the inner bag maintains flexibility for appropriate contraction during content discharge. This segmentation allows each component to fulfill its specific functional requirements independently.
Solution Approach 2:
Different parts of the container have different mechanical properties tailored to their specific functions. The outer shell is designed with hard characteristics for structural integrity and device attachment, while the inner bag is designed with flexible characteristics for proper contraction behavior during content discharge.
2Ease of operation
If the inner bag is made flexible for appropriate contraction, then the content discharge is improved, but the gas barrier property deteriorates
Solution Approach 1:
The container structure separates the contraction function (inner bag) from the gas barrier function (outer shell). The inner bag can be made flexible for proper contraction while the outer shell provides the necessary gas barrier properties, eliminating the need to compromise one property for the other.
Solution Approach 2:
The container uses composite construction with an outer shell and inner bag that can be made from different materials optimized for their respective functions. The outer shell can use materials with excellent gas barrier properties while the inner bag uses materials with appropriate flexibility for contraction.
3Ease of operation
If the inner bag contracts appropriately for content discharge, then the sprayability is improved, but the container structure becomes unstable
Solution Approach 1:
The container is segmented into an outer shell that maintains structural stability and an inner bag that provides contraction functionality. This allows the inner bag to contract appropriately for content discharge while the outer shell remains stable to prevent container collapse.
Solution Approach 2:
Different regions of the container have different mechanical characteristics: the outer shell has high structural stability to maintain container shape, while the inner bag has appropriate flexibility to enable contraction during content discharge.
Data Source
AI summary
Provided is a hard container capable of appropriately discharging or spraying content. The present invention provides a resin-made hard container for use with a suction device attached thereto that is configured to discharge or spray suctioned content. The hard container is provided with a container body having an outer shell and an inner bag. The container body is configured such that the inner bag contracts as the content is reduced. An innermost layer of the outer shell comprises an EVOH layer.