Tabbed Seal Hinge Joint Stress Distribution
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Solution Overview
Problem
Existing tabbed sealing members for containers face issues with durability and ease of removal due to stress concentration at the tab hinge joint, leading to potential tearing and exposure of underlying layers during heat sealing and removal, and often have inadequate grasping surfaces for consumers.
Innovation Solution
The development of a robust tabbed sealing member structure with additional support at the tab pivot and hinge joint, utilizing a more rigid non-foam layer and a living hinge joint, along with a segmented release layer to dissipate pulling stress and maintain structural integrity, and incorporating a foamed or non-foamed insulation layer for heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a full layer of adhesive is used to form the tab, then the tab provides larger grasping area for consumers, but the tab becomes prone to tearing at the hinge joint during heat sealing and removal
Solution Approach 1:
The patent applies a partial layer of adhesive only in specific regions rather than a full layer. The adhesive is positioned to bond the tab to the sealing member while deliberately leaving the hinge joint area adhesive-free or with reduced adhesive, creating local variations in bonding strength that prevent stress concentration and tearing at the critical hinge region.
2Ease of operation
If the side tab is made large to provide more grasping surface, then ease of removal is improved, but the side tab protrudes into the threaded portion of the closure and affects sealing quality
Solution Approach 1:
The patent transitions from side tabs that extend outward horizontally into the closure threads to a top tab configuration that extends vertically upward from the sealing member surface. This dimensional change allows the tab to provide adequate grasping surface area without interfering with the lateral engagement between the closure threads and container rim, thereby maintaining both ease of removal and sealing quality.
3Strength
If a partial layer of adhesive is used to form the tab, then structural integrity is maintained, but the manufacturing precision and consistency become more difficult to control
Solution Approach 1:
The patent incorporates a release layer or tab stock in the preliminary laminate construction that pre-defines the tab region. This release layer is positioned and bonded before the final adhesive application, serving as a template or mask that guides the partial adhesive layer placement. This preliminary structuring simplifies subsequent adhesive application and ensures consistent positioning and thickness, reducing manufacturing variability.
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
The enhanced structure provides consistent integrity during heat sealing and improved ease of removal by distributing stress effectively, preventing tearing and maintaining the seal's appearance, while offering a larger grasping surface for consumers.
Implementation Method 1
incorporating a foamed or non-foamed insulation layer for heat management
Implementation Method 2
segmented release layer to dissipate pulling stress and maintain structural integrity
Data Source
Figure 1~2
Figure 2a
Figure 3a~4c
AI summary
Tabbed sealing members with a robust tab structure having additional support under the tab and at a tab pivot or hinge joint.