Grooved Beverage Capsule Wall for Buckling-Resistant Extraction
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Solution Overview
Problem
Existing portion capsules for producing beverages have low mechanical stability, leading to buckling and uneven extraction processes during high-pressure brewing, which impairs beverage quality and makes removal difficult.
Innovation Solution
Incorporating a plurality of grooves in the base element's wall area for increased mechanical stability, reducing material thickness, and structuring the membrane to prevent adhesion, along with a shoulder for efficient stacking and a filter element for precise extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the wall area of the base element is made thinner to reduce material cost and improve environmental friendliness, then material usage and production cost are reduced, but mechanical stability and resistance to buckling under extraction pressure deteriorate
Solution Approach 1:
The patent applies this principle by using a thin-walled base element that maintains structural integrity through clever design rather than material thickness. The grooves create a corrugated structure that allows the thin wall to flex and deform elastically under pressure without buckling, enabling thin walls to support extraction pressures effectively.
Solution Approach 2:
The grooves in the wall area create curved, corrugated surfaces that inherently resist buckling. The curved geometry distributes stress more effectively than flat surfaces, allowing thin walls to maintain mechanical stability under the high pressures of the extraction process without requiring additional material.
2Strength
If grooves are added to the wall area to increase mechanical stability, then resistance to buckling and deformation is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The wall area is segmented into multiple sections by the grooves, creating a series of circumferential ridges and valleys. This segmentation divides the continuous wall into discrete zones that can deform independently, distributing stress and preventing catastrophic buckling while adding structural strength through a relatively simple geometric pattern.
Solution Approach 2:
The grooves introduce controlled curvature and corrugation to the wall surface, creating a corrugated structure that inherently resists buckling. This curved geometry provides mechanical strength without requiring complex multi-component assemblies, maintaining manufacturing simplicity while improving structural integrity.
3Ease of manufacture
If the wall area is made smooth and flat for simple manufacturing, then ease of manufacture is improved, but adhesion to the brewing chamber wall increases making ejection difficult
Solution Approach 1:
The grooves create a corrugated surface with curved ridges and valleys that reduce the contact area between the capsule wall and the brewing chamber. This curved, non-planar geometry prevents uniform adhesion, allowing the capsule to be ejected more easily after extraction while still being manufacturable through standard forming processes.
Solution Approach 2:
The thin-walled structure with grooves creates a flexible surface that can deform slightly during ejection, breaking adhesion bonds. The combination of thin walls and corrugated geometry allows the capsule to release from the brewing chamber wall more easily compared to thick, smooth-walled capsules.
4Productivity
If extraction liquid flows quickly through the beverage raw material for high productivity, then extraction speed is improved, but uniform flow distribution and extraction quality deteriorate
Solution Approach 1:
The grooves in the wall area create a corrugated structure that generates turbulence and swirl in the extraction liquid as it enters the cavity. This curved geometry promotes more uniform flow distribution across the beverage raw material bed, preventing channeling and ensuring consistent extraction throughout the capsule while maintaining efficient flow rates.
Data Source
Figure 1~4
Figure 5~6
AI summary
The invention relates to a portion capsule for producing a beverage, comprising a substantially truncated cone-shaped or cylindrical base element (2), which has a cavity (3) for receiving a beverage raw material, and to a membrane (4) closing said cavity, wherein a wall region of the base element comprises a plurality of grooves (15).