Oral Care Head Tuft Segmentation for Interdental Cleaning
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Solution Overview
Problem
Existing oral care implements face challenges in effectively cleaning both interdental areas and flat tooth surfaces due to issues with filament bending stiffness, plaque removal, and wear behavior, leading to reduced cleaning efficiency and potential gum damage.
Innovation Solution
A head for an oral care implement featuring tufts of flagged filaments with split ends and tufts of circular filaments with end-rounded ends, arranged in alternating rows, providing improved interdental penetration and scrubbing/polishing effects, while maintaining stability and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If longer filaments are used to improve interdental penetration, then flexibility increases, but bending stiffness decreases leading to reduced plaque removal efficiency
Solution Approach 1:
The filament is segmented into two distinct zones: an upper portion with smaller cross-sectional area for flexibility and interdental penetration, and a lower portion with larger cross-sectional area for bending stiffness and plaque removal. This segmentation allows each zone to optimize its function independently.
Solution Approach 2:
Different portions of the filament have different cross-sectional areas, creating local quality variations. The upper portion has reduced cross-sectional area for flexibility, while the lower portion has increased cross-sectional area for structural support and cleaning effectiveness.
2Strength
If thicker filaments are used to increase bending stiffness for better plaque removal, then cleaning efficiency improves, but gum injury risk increases
Solution Approach 1:
The filament structure is segmented with the thicker portion located at the lower section that contacts teeth for plaque removal, while the upper section has reduced thickness that contacts gums, providing gum protection while maintaining cleaning effectiveness.
Solution Approach 2:
The filament exhibits local quality variation along its length, with different cross-sectional areas optimized for different functions: the lower portion has larger area for stiffness and cleaning, while the upper portion has smaller area for gum safety.
3Ease of operation
If flagged or tapered filaments are used to improve interdental cleaning, then interdental penetration improves, but wear behavior worsens due to higher stress in filament tips
Solution Approach 1:
The filament is segmented into functional zones with the stress-concentrated flagged/tapered portion at the upper end for interdental penetration, while the lower end maintains uniform cross-section for strength and wear resistance during the scrubbing action.
Solution Approach 2:
The filament structure implements local quality changes with flagged or tapered geometry at the upper portion for improved interdental access, while the lower portion maintains optimal cross-sectional area for mechanical strength and wear resistance.
4Ease of manufacture
If standard tufts are used for cleaning, then manufacturing is simple, but capillary effects are insufficient for effective plaque removal
Solution Approach 1:
The filament incorporates local quality variations with modified cross-sectional geometry in specific zones to enhance capillary effects for plaque removal, while maintaining overall manufacturing feasibility through controlled extrusion processes.
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 combination of tuft types enhances cleaning efficiency by allowing deeper interdental penetration and thorough polishing on flat surfaces, reducing gum damage, and improving wear resistance, resulting in a superior brushing experience.
Implementation Method 1
standard tufts do not provide sufficient capillary effects to remove plaque and debris from the teeth and gums during brushing
Implementation Method 2
the contact pressure depends on the bending stiffness and the displacement of the filaments, while the bending stiffness of a single filament depends on its length and cross sectional area
Data Source
Figure 1~2
Figure 3~4
AI summary
A head (14) for an oral care implement (10) has a mounting surface (20) comprising at least one tuft of a first type (16) and at least one tuft of a second type (18), the at least one tuft of the first type (16) and the at least one tuft of the second type (18) each having a cross-sectional area extending in a plane substantially perpendicular to a longitudinal axis. The cross-sectional area of the tuft of the first type (16) is smaller than the cross-sectional area of the tuft of the second type (18). The at least one tuft of the first type (16) comprises flagged filaments having split free ends, and the at least one tuft of the second type (18) comprises filaments having a substantially circular cross-sectional area extending in a plane perpendicular to the longitudinal axis and having an end-rounded free end.