Packaging Container Flange Cutout for Stable Heat Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional packaging containers experience issues with unstable sealing and poor openability due to the weakening of the folded corner part of the container cap, particularly when using synthetic resin caps, which can lead to defects such as holes or reduced rupture strength, and uneven wall thickness in the container body causing non-uniform seal strength.
Innovation Solution
The packaging container design incorporates a synthetic resin container body with a flange part and a container cap featuring a top board and skirt part, where the cap is heat-sealed onto the flange part with specific cutout features at the upper end of the flange part to reduce the impact of molten resin on the folded corner, and surface roughening to enhance adhesion, ensuring stable sealing and easy opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat sealing is performed on the flange part to seal the container cap, then sealing stability is improved, but the folded corner part of the skirt may rupture due to molten resin protrusion and excessive sealing pressure
Solution Approach 1:
The flange part is segmented by providing cutout parts that divide the continuous flange structure into separate sections. This segmentation allows the sealing pressure to be distributed more evenly and prevents excessive pressure concentration at the folded corner part of the skirt, thereby preventing rupture while maintaining sealing stability.
Solution Approach 2:
The cutout parts are strategically positioned at specific locations on the flange part where molten resin tends to protrude. By creating localized openings in these high-risk areas, the design allows controlled resin flow paths that prevent resin accumulation and pressure buildup at critical points, particularly protecting the folded corner part while maintaining sealing effectiveness in other areas.
2Ease of manufacture
If the flange part is designed with a simple flat structure, then manufacturing complexity is reduced, but uneven wall thickness causes non-uniform seal strength
Solution Approach 1:
The flange part is divided into multiple sealing regions by the cutout parts, creating distinct sealing zones. This segmentation allows each zone to compensate for local wall thickness variations, ensuring that uneven thickness distribution does not result in non-uniform overall seal strength, while the flange itself remains a simple flat structure easy to manufacture.
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 prevents ruptures and damages to the folded corner part of the container cap, achieves stable sealing, and ensures easy and secure opening, even with uneven wall thicknesses, while maintaining compatibility with easy peeling and drop strength requirements.
Implementation Method 1
the top board part is heat-sealed onto an upper surface of the flange part of the container body
Data Source
AI summary
It is to provide a packaging container comprising: a synthetic resin container body having a flange part at a periphery of an opening at an upper end thereof; and a container cap having a top board part and a skirt part provided such that it is suspended from a-periphery of the top board part, and wherein the top board part is heat-sealed onto an upper surface of the flange part of the container body; wherein the packaging container has a first cutout part at an upper end of an outer edge of the flange part. By providing a first cutout part, a packaging container possible to achieve sealing with the container cap stably, and to open the sealing easily and surely as well can be provided, by suppressing the effect of a molten resin on a folded corner part of the skirt of the container cap when the container body is heat-sealed with the container cap.