Safety Lid Structure for Heated Beverage Extraction Cans
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Solution Overview
Problem
Traditional beverage cans pose safety risks due to sharp edges after lid opening and can explode when heated without prior opening, as existing safety mechanisms are not cost-effective for large-scale distribution.
Innovation Solution
A can design with a lid featuring a plastic annular portion that separates into a fixed outer rim and removable inner portion, equipped with a breaking line to prevent cutting and tearing means to discharge pressure when heated, ensuring safe handling and preventing explosions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lid inner removable portion is ripped by pulling a tab, then the can can be opened easily, but sharp edges are created causing cutting risks
Solution Approach 1:
The material of the annular portion is changed from metal to plastic, fundamentally altering the physical properties of the lid structure. This material substitution eliminates sharp edges while preserving the ripping mechanism, directly resolving the contradiction between ease of opening and cutting risk
Solution Approach 2:
The lid is designed as a composite structure combining metal can body with a plastic annular portion. This composite approach allows the metal portions to provide structural strength while the plastic annular portion provides safety by eliminating cutting hazards, simultaneously achieving ease of operation and harm reduction
2Productivity
If the can is heated without opening the lid, then beverage preparation is achieved, but the can may explode due to pressure increase
Solution Approach 1:
The plastic annular portion is designed to deform or break away in advance under pressure, creating a safety mechanism that activates before dangerous pressure buildup occurs. This preliminary action prevents explosion by providing a pressure relief path before the can reaches critical pressure levels
Solution Approach 2:
The plastic annular portion acts as a pre-prepared safety buffer that can absorb or redirect pressure buildup. By having this vulnerable element in place beforehand, the system cushions against the harmful effect of pressure increase, preventing catastrophic failure while allowing normal heating operations
3Reliability
If traditional exhausting valves are added to discharge pressure, then safety is improved, but device complexity and cost increase
Solution Approach 1:
The plastic annular portion serves multiple functions: it provides the ripping mechanism for opening the can, forms part of the lid structure, and acts as a pressure relief safety mechanism. This multi-functionality eliminates the need for separate exhausting valves, maintaining safety while reducing device complexity and cost
Solution Approach 2:
The plastic annular portion is designed to automatically respond to pressure buildup by deforming or breaking away, providing self-regulating pressure relief without requiring external control mechanisms or additional components. This self-service approach achieves safety functionality while minimizing structural complexity
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 design enhances user safety by eliminating sharp edges and prevents can explosions by allowing safe pressure discharge, addressing both issues with improved safety and cost-effectiveness.
Implementation Method 1
because of the inside liquid transforming into steam, the pressure inside the can may reach very high values
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The can (10; 10A; 10B; 10C) for the extemporaneous preparation of beverages by extraction and/or infusion comprises a first chamber (12) intended to collect the final beverage, a second chamber (14) containing a drinkable liquid and a filtering device (16) containing a substance able to produce the required beverage by extraction and/or infusion. The can is foreseen to be put onto a heating source after opening the can lid (18; 18A, 18B; 18C) and operating the filtering device (16) by the user. The lid (18; 18A, 18B; 18C) comprises: an outer rim portion (22; 22B) intended to remain fixed to the can lateral wall (20) when opening the can; an inner removable portion (24; 24A; 24B; 24C) intended to be ripped in order to open the can; and a predetermined breaking line (34) separating said inner removable portion (24; 24A; 24B; 24C) from said outer rim portion (22; 22B). The breaking line (34) is provided in an annular portion (28; 28A; 28B; 28C) forming part of the lid (18; 18A, 18B; 18C) and made of plastic material. The outer part (32; 32B) of the annular portion (28; 28A; 28B; 28C) is part of the outer rim portion (22; 22B) while the inner part thereof (24; 24A; 24B; 24C) is part of the inner removable portion (24; 24A; 24B; 24C).