Solid Shaving Aid Composition for Closer Shaves with Fewer Strokes
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Solution Overview
Problem
Current razor cartridges with solid shaving aid compositions do not provide a close enough shave, often requiring multiple strokes and potentially causing skin irritation.
Innovation Solution
A razor cartridge design featuring a housing with shaving blades and a solid shaving aid bar composed of a formulation including 15-48 wt.% soap base, 35-75 wt.% polyols, and 0.1-3 wt.% silicone cross-polymers, optimized for improved close shave and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current solid shaving aid compositions are used, then durability is maintained, but the shave is not close enough and requires multiple strokes
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the solid shaving aid bar. Specifically, it uses a soap base consisting of fatty acid salts with 8-24 carbon atoms (15-48 wt.%) combined with polyols having 2-8 carbon atoms (35-75 wt.%) and silicone cross-polymers (0.1-3 wt.%). This compositional parameter optimization enables the bar to generate sufficient lather with fewer strokes while maintaining durability, directly resolving the contradiction between shave closeness and number of strokes required.
2Productivity
If repeated exposure to sharp razor blades occurs, then hair removal is achieved, but skin irritation increases
Solution Approach 1:
The solid shaving aid bar acts as an intermediary between the sharp razor blades and the skin. The bar's composition (soap base with fatty acid salts, polyols, and silicone cross-polymers) generates a protective lather that mediates the interaction, allowing efficient hair removal while reducing direct blade-skin contact and minimizing skin irritation from repeated exposure.
Solution Approach 2:
The shaving aid bar provides beforehand cushioning by creating a protective lather layer before the razor blades contact the skin. This pre-formed lather cushion reduces the harmful impact of repeated blade exposure on the skin while maintaining effective hair removal capability.
3Manufacturing precision
If polyol content is increased to improve shave quality, then close shave is achieved, but formulation stability may be compromised
Solution Approach 1:
The patent employs composite materials by combining multiple components in a synergistic formulation: a soap base (fatty acid salts with 8-24 carbon atoms, 15-48 wt.%), polyols (2-8 carbon atoms, 35-75 wt.%), and silicone cross-polymers (0.1-3 wt.%). This composite structure allows the high polyol content needed for close shave quality while the soap base and silicone cross-polymers provide structural stability, preventing the formulation from becoming too unstable despite the high polyol concentration.
Data Source
AI summary
The present disclosure describes a razor cartridge including a housing having a front edge and a rear edge; shaving blades disposed between the front edge and the rear edge; and at least one shaving bar disposed in front of the blade(s) and/or rear of the blade(s) which includes a solid shaving aid composition that includes, relative to the total weight of the solid shaving aid composition: about 15 wt.-% to about 48 wt.-% of a soap base including of one or more fatty acid salts having from about 8 to about 24 carbon atoms and optionally one or more fatty acids having from about 8 to about 24 carbon atoms, at least about 35 wt.-% of one or more polyols including from ˜2 to ˜8 carbon atoms; the polyol selected from a group including glycerol, sorbitol, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, methylpropane diol glycol.