Easy-Open Packaging Body With Zoned Thickness for Low Opening Force
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Solution Overview
Problem
Existing resin containers face challenges in achieving both high sealability and easy openability, with issues such as unintentional opening during distribution, exposure of gas barrier layers, increased opening force requirements, and product-to-product variation in burst strength, along with complex mold processing and economic inefficiencies.
Innovation Solution
The easy-open packaging body features a flange portion with a surface seal layer and a lid member that includes a resin accumulation protruding outward from the joining position, a thin surface seal layer as the opening start, and controlled resin accumulations on the inner and outer sides of the joining position to facilitate interlayer peeling and reduce variations in burst strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the seal layer is made thin to reduce opening force, then easy openability is improved, but sealability deteriorates
Solution Approach 1:
The flange portion is designed with non-uniform thickness: a first region with smaller thickness (20-80 μm) at the outer peripheral side for easy opening, and a second region with larger thickness (80-150 μm) at the inner peripheral side for reliable sealing. This local variation in thickness allows each region to fulfill its specific function optimally.
Solution Approach 2:
The flange portion is segmented into two distinct regions based on thickness: the first region (outer peripheral) and second region (inner peripheral). This segmentation allows independent optimization of each region's properties - the thinner first region facilitates easy opening while the thicker second region ensures adequate sealability.
2Ease of operation
If the flange portion thickness is reduced to facilitate easy opening, then opening force is reduced, but burst strength varies significantly
Solution Approach 1:
Different thickness values are assigned to different regions of the flange portion. The first region has thickness of 20-80 μm for easy opening, while the second region has thickness of 80-150 μm for consistent burst strength. This local differentiation reduces variation in burst strength across the flange portion.
Solution Approach 2:
The thickness parameter of the flange portion is varied spatially across different regions. By changing the thickness parameter from 20-80 μm in the first region to 80-150 μm in the second region, the invention achieves both easy opening and consistent burst strength characteristics.
3Ease of operation
If annular cuts are provided on the flange portion to enable easy opening, then openability is improved, but gas barrier layers may be exposed
Solution Approach 1:
Instead of making annular cuts that would expose the gas barrier layer, the invention extracts the opening function to the flange portion itself by making it thin and easy to peel. The peeling occurs at the flange portion level without compromising the integrity of the underlying gas barrier layer.
Solution Approach 2:
The thin flange portion acts as an intermediary layer that facilitates opening without exposing the gas barrier layer. The peeling occurs at the flange portion, which serves as a sacrificial element that protects the more critical gas barrier layer from exposure.
4Reliability
If the seal portion is positioned at the outer lower portion of the flange, then sealability is improved, but openability deteriorates due to strong sealing
Solution Approach 1:
The flange portion is designed with spatially varying thickness: thinner (20-80 μm) at the outer peripheral side where opening is initiated, and thicker (80-150 μm) at the inner peripheral side where sealing occurs. This allows the seal portion to be strongly sealed while the outer region remains easy to open.
Solution Approach 2:
The flange portion is segmented into functional regions: the first region (outer peripheral) optimized for easy opening with smaller thickness, and the second region (inner peripheral) optimized for sealing with larger thickness. This segmentation resolves the contradiction between strong sealing and easy opening.
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 ensures excellent sealability and easy openability with reduced opening force, prevents unintentional opening, and stabilizes burst strength, facilitating efficient product management and cost-effective mold processing.
Implementation Method 1
a lid member that can be attached to the flange portion by heat sealing
Data Source
AI summary
The disclosure relates to a packaging body including a container including a flange portion including a surface seal layer formed on a top surface, and a lid member that is joinable to the flange portion. In the flange portion, a side wall portion extending in a container axial direction is formed on an outer side of an outer peripheral edge of a joining position with the lid member. A resin accumulation composed of the surface seal layer and protruding outward from the outer peripheral edge of the joining position, and the surface seal layer having a small thickness serving as an opening start portion provided on the lower or inner side of the resin accumulation are provided. Thus, an easy-open packaging body that can be easily opened with a small opening force is achieved.