Underarm Sweat Pad with Segmented Adhesive Bonding
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Solution Overview
Problem
Conventional underarm sweat pads face issues with skin irritation, peeling, and reduced air and liquid permeability due to insufficient bonding between the front surface sheet and absorbent body, especially when made with man-made fibers, and the weakness of 100% cotton pads leading to tearing.
Innovation Solution
An underarm sweat pad design featuring a hydrophilic cellulosic fiber front surface sheet with adhesive regions formed as stripes parallel to the folding line and debossed grooves on the skin-side surface, ensuring strong bonding without compromising air and liquid permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a nonwoven fabric made of man-made fiber is used as the front surface sheet, then the strength is high and stretching or tearing due to rubbing rarely occurs, but it causes itching, rashes, and does not meet needs of people with sensitive skin
Solution Approach 1:
The patent changes the material parameter of the front surface sheet from synthetic fibers to 100% cotton nonwoven fabric, transforming it from a strength-focused material to a skin-friendly material. This parameter change resolves the contradiction by prioritizing skin comfort while accepting the need for alternative bonding solutions to maintain structural integrity.
2Object-affected harmful factors
If a cotton nonwoven fabric made of 100% cotton is used as the front surface sheet, then it can be washed and used many times and is gentle to skin, but the strength is weaker and stretching or tearing easily occurs by rubbing
Solution Approach 1:
The bonding between front surface sheet and absorbent body is segmented into multiple adhesive parts extending along the longitudinal direction. This segmentation distributes the bonding load across multiple points, preventing the front surface sheet from peeling off and reducing stretching or tearing at any single location.
Solution Approach 2:
An adhesive is introduced as an intermediary substance between the cotton front surface sheet and the absorbent body. This adhesive mediator provides the necessary bonding strength to prevent peeling and tearing, allowing the use of skin-friendly cotton material without compromising structural integrity.
3Reliability
If the entire surface of the front surface sheet is attached to the absorbent body using an adhesive, then peeling is prevented, but body fluid hardly moves from the front surface sheet to the absorbent body and air permeability is lowered
Solution Approach 1:
The adhesive bonding is segmented into multiple discrete adhesive parts rather than continuous coverage. This segmentation creates gaps between adhesive regions that allow body fluid to pass through from the front surface sheet to the absorbent body while still providing sufficient bonding stability to prevent peeling.
Solution Approach 2:
The adhesive is applied locally at specific positions along the longitudinal direction rather than uniformly across the entire surface. This local quality approach provides bonding where needed to prevent peeling while leaving other areas open for fluid permeability and air circulation.
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 solution prevents peeling and tearing of the front surface sheet while maintaining high air and liquid permeability, making it gentle on the skin and suitable for users with sensitive skin, and allowing for easy bending without reducing absorption efficiency.
Implementation Method 1
adhesive regions in which an adhesive for bonding the front surface sheet to the absorbent body are formed
Implementation Method 2
the front surface sheet is made of a hydrophilic cellulosic fiber
Implementation Method 3
a liquid-permeable front surface sheet
Data Source
AI summary
To configure a pad so as to be gentle to the skin, to prevent stretching and/or tearing of the front surface sheet, and to not reduce liquid permeability and air permeability. [Solution] An underarm sweat pad in which an absorbent is interposed between a front surface sheet and a back surface sheet and which is used folded in two at a folding line and attached to the inside of the axillary portion of a garment. The front surface sheet is composed of a hydrophilic cellulose fiber. Adhesive regions, in which an adhesive for bonding the front surface sheet to the absorbent is applied, are formed as stripes that are parallel to the folding line and are spaced at intervals in the direction that is orthogonal to the folding line.