Razor Cartridge Guard Structure for Low-Friction Skin Contact
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Solution Overview
Problem
Existing razor cartridges experience excessive friction between the guard portion and skin, leading to discomfort and reduced gliding performance during shaving, and fail to effectively remove foreign substances before shaving.
Innovation Solution
A razor cartridge design featuring a guard portion with a combination of flexible and rigid materials, where the rigid guard has a three-dimensional surface roughness of 20 μm to 200 μm, and a flexible guard with protruding fins, which reduces friction and enhances gliding by pulling the skin smoothly while effectively removing foreign substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a guard portion is made of high friction material to improve skin contact, then skin contact is improved, but excessive friction occurs between the guard portion and skin
Solution Approach 1:
The guard portion is divided into two distinct regions: a front region with low friction properties and a rear region with high friction properties. This local differentiation allows the front part to glide smoothly over the skin while the rear part maintains strong skin contact for effective shaving, thus resolving the contradiction between friction and skin contact.
Solution Approach 2:
The guard portion combines materials with different friction characteristics in a single component. The front region uses a material or surface treatment that provides low friction, while the rear region uses a material that provides high friction. This composite approach enables the guard to simultaneously achieve smooth gliding and effective skin contact.
2Stability of the object's composition
If a rigid guard is used to maintain structure, then structural stability is improved, but foreign substances are not effectively removed from skin
Solution Approach 1:
The rigid guard incorporates localized friction-enhancing features (such as protrusions or textured regions) in specific areas while maintaining overall structural rigidity. These localized high-friction zones effectively remove foreign substances from the skin during shaving, while the rest of the guard maintains its structural stability.
Solution Approach 2:
The rigid guard may incorporate porous or textured surface structures that increase surface area and friction contact with the skin. These structures help trap and remove foreign substances while the bulk material maintains structural rigidity and stability.
3Ease of operation
If a flexible guard is used to pull skin, then skin contact is improved, but excessive friction occurs reducing gliding performance
Solution Approach 1:
The flexible guard is segmented into different functional zones: a front zone with reduced friction characteristics for smooth gliding, and a rear zone with enhanced friction for effective skin contact and pulling. This segmentation allows each zone to perform its specific function without compromising the other.
Solution Approach 2:
Different regions of the flexible guard have different friction properties. The front region is designed with low friction to enable smooth gliding over the skin, while the rear region has high friction to effectively pull and contact the skin during the shaving stroke.
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 design prevents excessive friction, allows smoother shaving strokes, and effectively removes foreign substances, improving the overall shaving experience by maintaining close contact with the skin and retaining shaving aid for enhanced glide and comfort.
Implementation Method 1
a rigid guard disposed in front of the first flexible guard with respect to the shaving direction, and formed with unevenness having a three-dimensional surface roughness (SA) of 20 μm to 200 μm on a surface thereof
Implementation Method 2
A razor cartridge design featuring a guard portion with a combination of flexible and rigid materials, where the rigid guard has a three-dimensional surface roughness of 20 μm to 200 μm, and a flexible guard with protruding fins, which reduces friction and enhances gliding by pulling the skin smoothly
Implementation Method 3
A shaving aid is retained in an unevenness of a rigid guard, thereby allowing the razor cartridge to glide more smoothly
Data Source
AI summary
A razor cartridge is proposed. The razor cartridge may include at least one blade having a cutting edge, and a blade housing accommodating the blade in a longitudinal direction. The razor cartridge may also include a guard unit disposed in front of the blade accommodated in the blade housing with respect to the shaving direction. The guard unit may include a first flexible guard, disposed adjacent to the blade, for contacting the skin of a user. The guard unit may also include a hard guard, disposed in front of the first flexible guard with respect to the shaving direction and having recesses and protrusions formed on the surface thereof, the recesses and protrusions having a three-dimensional surface roughness (SA) in the range of 20 μm-200 μm.