Delamination Container Upright Wall Angle Prevents Deformation
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Solution Overview
Problem
Delaminatable containers face challenges such as deformation when caps are mounted, difficulty in smooth inner layer shrinkage, complex die structures increasing production costs, and air ingress leading to content degradation, which affect the container's functionality and productivity.
Innovation Solution
The design includes a container body with a constriction section and an upright wall at a specific angle to prevent inner layer catching, a slidable innermost layer for smooth deformation, a central recessed region for sealing portion accommodation, a fresh air inlet on a less rigid portion for immediate delamination, and a tilt suppressor to prevent cap tilting and air ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a support ring is provided in the mouth of the container to suppress deformation during cap mounting, then the container deformation is reduced, but the inner layer is caught by the outer layer causing difficulty in delamination
Solution Approach 1:
The invention removes the support ring structure from the container design. Instead of adding a support ring that causes delamination issues, the patent extracts this component entirely and relies on the structural integrity of the container body itself and the cap mounting process to prevent deformation, thereby resolving the contradiction between deformation resistance and delamination ease
Solution Approach 2:
The invention segments the container body into an inner bag and outer shell that can delaminate independently. By designing the mouth structure without a support ring and allowing the inner layer to be pulled out through the mouth opening, the segmentation principle enables the inner layer to separate cleanly from the outer layer without being caught by rigid support structures
2Reliability
If the inner bag is shrunk by discharging contents through a cap with check valve, then air ingress is prevented, but the inner bag does not shrink smoothly in small containers
Solution Approach 1:
The invention provides a fresh air inlet that allows air to enter the space between the outer shell and inner bag before the inner bag shrinks. This preliminary air admission prevents vacuum formation and allows the inner bag to shrink smoothly without resistance, while the check valve still prevents air from entering the inner bag itself during normal operation
Solution Approach 2:
The space between the outer shell and inner bag acts as an intermediary chamber. The fresh air inlet introduces air into this intermediate space, which then facilitates the smooth shrinking of the inner bag by providing counterpressure, while the check valve ensures this air does not directly enter the inner bag and compromise content integrity
3Strength
If welded layers in sealing portion are engaged by multiple penetration portions to increase strength, then sealing strength is improved, but the die structure becomes complex increasing production cost
Solution Approach 1:
The invention changes the sealing mechanism from relying on multiple penetration portions (complex geometric feature) to relying on the material properties and welding parameters of the laminated parison. By optimizing the welding process parameters and the structure of the sealing portion itself, sufficient strength is achieved without requiring complex die structures with multiple penetration features
4Strength
If a protruding sealing portion is provided to increase strength, then impact resistance is improved, but production complexity increases due to required die pins
Solution Approach 1:
The invention applies local quality by providing the recessed region specifically at the bottom of the container body where the sealing portion is located. This localized structural feature allows the sealing portion to be accommodated and reinforced without requiring complex die pins throughout the entire molding process. The recessed region is created through simple molding techniques that form the desired shape during container formation
Data Source
AI summary
Provided is a delamination container that can suppress deformation of container, when a cap is attached thereto, without being provided with a support ring. The delamination container has a container body with an accommodation section for accommodating contents therein and an opening for discharging the contents from the accommodation section. The accommodation section and the opening have an inner layer, which contracts as the contents decrease, and an outer layer. The opening has an engagement section with a cap, which is to be attached to the opening, and a constriction section that constricts toward the inner side of the opening. The opening has an upright wall extending from an outer edge of an upper wall of the constriction section at an angle between 34 degrees and 135 degrees relative to the upper wall. There is an inner layer gap between the upright wall and the upper wall.