Shaving Foil With Zone-Specific Hole Sizes
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Solution Overview
Problem
Existing electric shaving foils lack optimal adaptation to varying skin conditions and contact pressures, leading to either inadequate shaving thoroughness or skin irritation.
Innovation Solution
A shaving foil with a perforated region divided into central and edge zones, where hole sizes vary to accommodate different contact pressures, with smaller holes in high-pressure areas and larger holes in low-pressure areas, ensuring thorough and gentle shaving by optimizing skin arching into the holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If uniform hole sizes are used across the entire shaving foil, then manufacturing is simple, but shaving thoroughness and skin gentleness cannot be optimized simultaneously due to varying contact pressures
Solution Approach 1:
The shaving foil implements local quality by dividing the perforated region into zones with different hole size characteristics. The central zone has smaller average hole sizes to accommodate higher contact pressures and prevent skin irritation, while edge zones have larger average hole sizes to facilitate hair entry under lower pressure conditions. This spatial variation in hole quality optimizes both shaving thoroughness and skin gentleness across different regions of the foil.
2Productivity
If larger holes are used to improve hair removal efficiency, then more hair can enter the foil, but skin irritation increases under high contact pressure areas
Solution Approach 1:
The patent applies local quality by creating zone-specific hole size characteristics that balance hair removal efficiency with skin protection. In the central zone where contact pressure is highest, smaller holes prevent skin irritation while still allowing adequate hair entry. In edge zones where contact pressure is lower, larger holes enhance hair removal efficiency. This localized differentiation resolves the contradiction between productivity and harmful effects.
3Object-affected harmful factors
If smaller holes are used in high pressure areas, then skin irritation is reduced, but shaving thoroughness may be compromised
Solution Approach 1:
The invention resolves this contradiction by applying local quality principles: the central zone features smaller average hole sizes specifically where high contact pressure occurs during shaving, thereby reducing skin irritation in the most critical area. The edge zones maintain larger average hole sizes to ensure adequate hair entry and contribute to overall shaving thoroughness. The combined effect of zone-differentiated hole sizes achieves both skin protection and shaving effectiveness.
Data Source
AI summary
A shaving foil for an electric shaving apparatus. The shaving foil includes a perforated region with a plurality of holes which are separated from each other by bars. The perforated region is divided at least into two zones, preferably a central zone, a first edge zone, and a second edge zone. The central zone is arranged between the first edge zone and the second edge zone. The holes in the central zone have (i) an average size which is smaller than the average size of the holes in the first edge zone and in the second edge zone, (ii) a floating mean value of the size of the openings in the central zone smaller than a floating mean value of the size of the openings in the first edge zone and the second edge zone, or both (i) and (ii).