Delaminatable Container Vent Recess for Inner Bag Interference
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Solution Overview
Problem
Delaminatable containers with outer shells and inner bags face issues where the movement of valve members can be interfered by the inner bag, leading to unsatisfactory air introduction into the space between the outer shell and inner bag after content discharge, affecting recovery characteristics.
Innovation Solution
The design includes a valve housing recess with a basal plane that extends smoothly to the outer periphery, reducing interference between the inner bag and valve member, and a hydrophobic filter with controlled air leakage to ensure proper air introduction and recovery of the outer shell, even without a valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve member is provided to control air flow, then discharge characteristics and recovery characteristics are improved, but the valve member may be interfered with by the inner bag pressing against it
Solution Approach 1:
A valve housing recess is introduced as an intermediary structure between the inner bag and the valve member. This recess provides a dedicated space that allows the valve member to move freely without being pressed against by the inner bag, thereby eliminating the interference problem while maintaining the valve's air control function
Solution Approach 2:
The valve housing recess creates an additional spatial dimension (a recessed area) that separates the valve member from the inner bag. This dimensional change allows the valve to operate in a protected zone where it is not subjected to direct pressure from the inner bag
2Reliability
If the valve housing recess has a side surface at the body-side with a large tilt angle, then the valve member is protected from inner bag interference, but manufacturing complexity increases
Solution Approach 1:
The tilt angle of the body-side side surface is optimized to 45 degrees or less. This parameter change provides a balance: the angle is sufficiently steep to protect the valve member from inner bag interference, yet shallow enough to be easily manufactured using conventional molding techniques
3Reliability
If a valve member is provided to control air flow, then recovery characteristics are improved, but the device complexity increases
Solution Approach 1:
The valve member is designed to automatically open and close based on pressure differential. During content discharge, the valve closes to prevent air ingress; during recovery, the pressure difference automatically opens the valve to allow air in. This self-regulating mechanism improves recovery characteristics without requiring complex control systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the prompt introduction of external air into the space between the outer shell and inner bag, improving recovery characteristics and maintaining discharge and recovery performance.
Implementation Method 1
a hydrophobic filter arranged to block the air inlet and configured to allow permeation of air and blocking of water
Implementation Method 2
an inner bag configured to store contents therein and to shrink as the contents decrease
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3
AI summary
A delaminatable container can promptly introduce the external air into the space between the outer shell and the inner bag after discharging the contents. A delaminatable container includes a container body having an outer shell and an inner bag, the inner bag shrinking as contents decrease; and a valve member to adjust charging/discharging of air between an intermediate space and an external space S of the container body, the intermediate space located between the outer shell and the inner bag; wherein: the container body includes a storage portion to store the contents; and a mouth to discharge the contents from the storage portion; the storage portion includes a pillar body; and a shoulder connecting the body and the mouth; the shoulder is provided with a valve housing recess to house the valve member; an air inlet to introduce external air into the intermediate space between the outer shell and the inner bag is provided in the valve housing recess; the valve member is mounted on the air inlet; the valve housing recess includes a basal plane; and a circumferential side surface provided at both sides in a circumferential direction of the basal plane; and the valve housing recess is structured so as not to have a side surface at the body-side; or is structured so that a tilt angle of a body-side side surface provided at the body-side with respect to the basal plane is 45 degrees or less.