Absorbent Article Adhesive Rheology for Clean Removal
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Solution Overview
Problem
Existing panty-fastening adhesives (PFA) for feminine hygiene articles face challenges in achieving good initial attachment, staying in place during movement, and easy removal without residue, particularly when used with microfiber undergarments, and are affected by consumer application habits and washing aids.
Innovation Solution
The adhesive formulation exhibits specific rheological and mechanical properties, including tan delta and storage modulus values within defined ranges, to ensure effective attachment, stay in place, and easy removal, with reduced residue, suitable for both cotton and microfiber undergarments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If higher amounts of PFA are utilized to ensure strong initial attachment and stay in place, then attachment strength is improved, but adhesive residues and product tearing increase during removal
Solution Approach 1:
The patent modifies the rheological parameters of the adhesive, specifically controlling tan delta and storage modulus values, to achieve optimal balance between attachment strength and removable cleanliness. By adjusting these physical parameters, the adhesive provides sufficient bonding strength while enabling clean removal without residues.
Solution Approach 2:
The adhesive formulation combines multiple components with complementary properties to achieve both strong attachment and clean removal. The composite adhesive system integrates polymers and additives that work together to provide the required mechanical properties and removal characteristics.
2Reliability
If the adhesive is made stronger to hold during user movement, then stay in place performance is improved, but initial attachment becomes more difficult to achieve with low application pressure
Solution Approach 1:
The adhesive exhibits dynamic rheological behavior with different tan delta and storage modulus characteristics at different frequencies. This dynamic response allows the adhesive to provide low viscosity during initial application for easy attachment, then transition to higher viscosity during wear for reliable stay-in-place performance.
Solution Approach 2:
The patent utilizes frequency-dependent rheological parameter changes to achieve different performance characteristics at different stages. The tan delta and storage modulus values vary with frequency, enabling the adhesive to be both easy to apply and strong during wear.
3Strength
If conventional PFA is used with microfiber undergarments, then initial attachment may be achieved, but adhesion fails during movement and removal leaves residue
Solution Approach 1:
The patent specifically optimizes the rheological parameters (tan delta and storage modulus) of the adhesive formulation to work effectively with microfiber surfaces. These parameter adjustments enable the adhesive to maintain reliable adhesion during movement while preventing residue on removal.
Solution Approach 2:
The adhesive is formulated as a composite material specifically optimized for microfiber substrates, combining polymers and additives that provide both initial attachment and sustained adhesion without residue on removal.
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 adhesive achieves strong initial attachment, maintains adhesion during user movement, and minimizes residue upon removal, addressing the limitations of conventional PFAs across various undergarment materials.
Implementation Method 1
the adhesive exhibits a tan delta—1 value between 0.28 to 1.2, 0.28 to 1.13 or 0.28 to 0.51, over a frequency range of between 0.01 Hz and 1 Hz at 37 degrees C. in accordance with the Frequency Sweep-Oscillatory Rheometry Test Method. The adhesive also exhibits a storage modulus—1 value of less than 85 kPa, 74 kPa or less or 57 kPa or less, between 0.01 and 1 Hz at 37 degrees C.
Implementation Method 2
adhesive for fastening a disposable absorbent article to an article of clothing, particularly underwear
Data Source
AI summary
A disposable absorbent article is described. The disposable absorbent article includes a topsheet forming at least a portion of a wearer-facing surface of the absorbent article; a backsheet forming at least a portion of a garment-facing surface of the absorbent article; an absorbent core disposed between the topsheet and the backsheet; and an adhesive for attachment of the disposable absorbent article to an undergarment. The adhesive is disposed on the garment-facing surface. The absorbent article exhibits a peel force of at least 1.0 N, about 1.1 N or about 1.2 N in accordance with the Peel Force test and leaves no residue on an undergarment in accordance with the Adhesive Residue test.