Capsule Bursting Disc for Flow Control
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Solution Overview
Problem
Existing coffee capsules face challenges in producing a simple and cost-effective design for the outlet opening mechanism, with complications in installing and controlling the bursting foil due to its small diameter and difficult behavior when bursting open.
Innovation Solution
A capsule design featuring a bursting disc positioned above the floor, which is easy to install and dimensionally stable, with support and stiffening means to control bursting behavior, and predetermined breaking points for precise opening, allowing for adjustable flow behavior and integration with a perforated bottom or filter bottom for improved liquid flow and foam formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bursting foil is installed directly above the outlet nozzle, then the outlet can be closed, but the installation becomes very complicated and the bursting behavior becomes difficult to control
Solution Approach 1:
The bursting disc is extracted from the outlet nozzle location and relocated to the capsule bottom, separating the closing function from the problematic installation location. This allows the bursting disc to be installed independently at the bottom while still achieving outlet closure through pressure-induced bursting.
Solution Approach 2:
A liquid-tight connection is established between the bursting disc and the capsule bottom, creating an intermediary structure that transmits pressure effectively. This connection serves as a mediator that allows the bursting disc to function reliably while being installed at a different location than the outlet nozzle.
2Reliability
If a bursting foil with small diameter is used, then the outlet can be effectively closed, but it becomes difficult to control the bursting behavior
Solution Approach 1:
The bursting disc is given a larger diameter in the horizontal dimension, extending beyond the outlet nozzle area. This dimensional change provides greater surface area for controlled bursting while maintaining the closing function, allowing the bursting behavior to be more easily influenced by pressure distribution.
Solution Approach 2:
The bursting disc is designed with different regions having different properties - the central region covers the outlet nozzle for closing, while the extended peripheral regions provide additional bursting control. This local differentiation allows simultaneous achievement of reliable closing and controllable bursting behavior.
3Ease of manufacture
If the bursting disc is positioned close to the ground, then it is easy to install, but the liquid flow may be impaired
Solution Approach 1:
The bursting disc is designed to transition from a static closed position to a dynamic open position during bursting. The disc can pivot or deform under pressure, creating a dynamic opening that allows liquid flow while maintaining the simple bottom installation configuration.
Solution Approach 2:
The bursting disc is divided into functional zones - a central region for closing the outlet and peripheral regions for controlled bursting. This segmentation allows the disc to maintain its installed position near the bottom while creating controlled flow paths during the bursting process.
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 provides improved control over the opening process, simplifies production, and enhances the flow behavior of the liquid, allowing for efficient beverage preparation while preventing the washing out of substances like coffee powder.
Implementation Method 1
a bursting disc (8) which can burst under internal pressure in the chamber (6) is arranged at a small distance above the floor (4)
Data Source
Figure 1~2
Figure 3~4
Figure 5~9
AI summary
The invention relates to a capsule (1) comprising a capsule body (2) that has a preferably rotationally-symmetrical design and has a lateral wall (3) and a base (4) which, in particular, is formed integrally with said wall. The capsule body is covered by a cover (5) so as to form a chamber (6) containing a substance (7) for the preparation of a liquid foodstuff. A rupture disc (8) is held over said base (4) and bursts in the chamber when subjected to an inner pressure. Openings in said rupture disc can thus be exposed by means of which flow behaviour can be controlled.