Resin Container Lid Tab Flexural Strength Optimization
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Solution Overview
Problem
Resin container lids often crack when opened in refrigerating or freezing environments due to stress concentration at the flange part, causing the lid to adhere tightly to the container and making it difficult to open.
Innovation Solution
A resin container lid with a tab having a flexural strength of 50 to 80 N at -30°C, designed to reduce stress concentration at the flange part base, allowing for easy opening while preventing cracks, by optimizing the tab's shape and material properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tab is made with high flexural strength to withstand stress during opening, then the tab can resist breaking, but stress concentrates at the flange part base causing cracks
Solution Approach 1:
The patent specifies a flexural strength range of 50 to 80 N for the tab at -30°C, optimizing the mechanical properties to balance stress resistance with stress distribution. This parameter optimization prevents both tab breaking and flange cracking by achieving an ideal strength level that neither concentrates excessive stress nor fails under load.
2Strength
If the resin becomes hard in cold environments to maintain structural integrity, then the container maintains its shape, but the lid adheres tightly to the container making it difficult to open
Solution Approach 1:
The patent optimizes the resin material properties to achieve a flexural strength of 50 to 80 N at -30°C, which is a specific parameter change that allows the resin to maintain adequate structural integrity while remaining sufficiently flexible for easy opening. This temperature-specific parameter optimization resolves the contradiction between hardness and ease of operation in cold environments.
3Reliability
If food moisture solidifies at the gap between container and lid, then the container is well sealed, but the lid adheres tightly causing opening difficulty
Solution Approach 1:
By optimizing the tab's flexural strength to 50 to 80 N at -30°C, the patent creates sufficient opening force capability that overcomes the adhesion caused by frozen food moisture. The enhanced tab strength at low temperatures provides enough mechanical advantage to break the seal created by solidified moisture while maintaining proper sealing during storage.
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 solution effectively prevents cracks at the flange part base and maintains ease of opening even in freezing environments by distributing stress evenly, ensuring the lid can be opened without damage.
Implementation Method 1
the lower the flexural strength of the tab is, the easier the tab elastically deforms, and stress does not concentrate at the vicinity of the flange part at the base of the tab
Data Source
AI summary
Provided is a resin container lid in which a trouble such as a crack is prevented while maintaining easiness in opening even under a refrigerating or freezing environment, the resin container lid configured to be fitted to and detached from a resin container, the resin container lid including a flange part configured to be fitted to a container, the flange part being formed at a peripheral edge of the resin container lid, and an opening tab for detachment from the container, the opening tab projecting into an outer periphery from the flange part, with the tab having a flexural strength of 50 to 80 N under an environment of −30° C.