Absorbent Pad Waist Elastic Shear Force
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Solution Overview
Problem
Existing absorbent articles with separate belts face issues of incorrect positioning and inadequate hook-loop connection strength, leading to potential detachment and leakage, due to insufficient shear force from waist elastics, which can be too low or too high, affecting comfort and durability.
Innovation Solution
Incorporating waist elastics between hook elements on the absorbent pad, which are stretched to apply a controlled shear force to enhance the peel strength of hook-loop connections, ensuring they fall within a desirable range of 2 N to 7 N, thereby maintaining secure attachment without accidental separation or damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the peel force of hook-loop connections is increased to prevent accidental detachment, then reliability is improved, but the belt may be damaged during detachment
Solution Approach 1:
The patent introduces waist elastics that apply a controlled shear force parameter to the hook-loop connections. By adjusting the elastic force parameter within a specific range (2-7 N), the connection strength is enhanced enough to prevent accidental detachment during use, while avoiding excessive force that would damage the belt during intentional detachment. This parameter optimization resolves the contradiction between attachment reliability and belt strength.
2Strength
If the shear force from waist elastic is increased to strengthen hook-loop connections, then peel strength is improved, but the elastic may break the attachment by its own shear force
Solution Approach 1:
The patent precisely controls the shear force parameter from the waist elastic within the range of 2-7 N. This optimized parameter range ensures that the elastic provides sufficient shear force to strengthen the hook-loop connection and prevent accidental detachment, while simultaneously avoiding excessive force that would cause the elastic itself to break the attachment. The parameter optimization creates a balanced state where both peel strength and attachment stability are achieved.
3Strength
If the peel force of hook-loop connections is too low, then the belt is protected from damage, but the pad may detach accidentally resulting in leakage
Solution Approach 1:
The patent applies a controlled shear force parameter from the waist elastic (2-7 N) to the hook-loop connections between the pad and belt. This parameter optimization ensures that the connection strength is sufficient to prevent accidental detachment and leakage during normal use, while maintaining the belt's durability by avoiding excessive peel forces. The optimized parameter range simultaneously addresses both the leakage risk and belt durability concerns.
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 controlled shear force from the waist elastic strengthens the hook-loop connections, preventing accidental detachment and ensuring reliable attachment and detachment of the absorbent pad from the belt, enhancing user comfort and convenience.
Implementation Method 1
the elastic force from said waist elastic is within the range from 2 N to 7 N when the elastic is in the fully stretched condition
Data Source
AI summary
An absorbent article comprising a separate belt intended to be placed around the waist of the wearer and an absorbent pad detachably attached to the belt and held by the belt when the article is used, wherein the pad comprises a chassis having a liquid-permeable topsheet, a liquid-impermeable backsheet and an absorbent core between the topsheet and the backsheet, wherein the absorbent pad includes a front portion, a rear portion and a crotch portion there between in the longitudinal direction and wherein the absorbent pad at each of its longitudinal ends is detachably attached to a surface of the belt oriented away from wearer using attaching arrangements provided on each corner of the front portion and the rear portion of the pad, wherein at least one of the front and rear portion is provided with a waist elastic arranged symmetrically on each side of the longitudinal center line and extending between the attaching elements in the transverse direction of the pad, wherein the waist elastic is provided at the waist portion of at least one of the front and rear portion and is movable between a contracted condition in which the topsheet and/or backsheet exhibit(s) pleats and a fully stretched condition in which the pleats of the topsheet and/or backsheet are fully stretched out, wherein the elastic force from said waist elastic is within the range of from 2 N to 7 N when the elastic is in the fully stretched condition.