Absorbent Article Side Sheet Leakage Prevention
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Solution Overview
Problem
Conventional absorbent articles with elastically stretchable members on side sheets can cause discomfort due to contraction force on the skin, while those without them are prone to leakage from the side portions.
Innovation Solution
An absorbent article design without an elastically stretchable member on side sheets, featuring non-adhesive and adhesive portions to allow side sheets to stand up and prevent leakage, with constricted or grooved sections to enhance fluid containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastically stretchable member is provided on the side sheet to prevent lateral leakage, then leakage prevention is improved, but uncomfortable feeling during wearing increases
Solution Approach 1:
The patent removes the elastically stretchable member from the side sheet structure, extracting the component that causes discomfort while maintaining leakage prevention through alternative means (the stand-up side sheet configuration without elastic contraction).
Solution Approach 2:
Instead of using elastic contraction to create the stand-up effect, the patent inverts the approach by using a rigid or semi-rigid side sheet that maintains its upright position through structural design rather than elastic recovery, thereby eliminating the harmful contraction force on the skin.
2Ease of operation
If an elastically stretchable member is removed from the side sheet to reduce uncomfortable feeling, then wearing comfort is improved, but leakage prevention deteriorates
Solution Approach 1:
The side sheet is segmented into distinct functional regions: a non-adhesive portion that remains free to stand up and block fluids, and adhesive portions at the ends that secure the side sheet to the absorber. This segmentation allows the side sheet to maintain its protective position without requiring elastic members.
Solution Approach 2:
The side sheet is designed to automatically stand up and position itself to block lateral fluid flow without requiring active elastic contraction mechanisms. The structural design enables the side sheet to self-position for leakage prevention while maintaining comfort.
3Object-affected harmful factors
If the side sheet does not stand up toward the skin side to eliminate elastic contraction force, then uncomfortable feeling is reduced, but leakage from side portion increases
Solution Approach 1:
The side sheet is pre-configured in an upright position during manufacturing, with the non-adhesive portion positioned to extend toward the skin side before wearing. This preliminary positioning ensures that when the absorbent article is worn, the side sheet is already in the correct position to block lateral leakage without requiring elastic contraction during use.
Data Source
AI summary
[Problem to be solved] To reduce uncomfortable feeling during wearing, and to prevent leakage from a side portion. [Solution] An absorber 4, and side sheets 7 disposed on both side portions in a longitudinal direction of a skin-contact surface side over an entire length in the longitudinal direction are provided. The side sheets 7 do not include an elastically stretchable member. There are provided a non-adhesive portion 10, in which a center portion in the width direction of the side sheets 7 is not bonded to the absorber 4 side, in a longitudinal section including a region corresponding to a body fluid discharge portion H of a wearer, and adhesive portions 11 and 12 in which side sheets 7 are bonded to the absorber 4 at an outer side in the width direction and at both end sides in the longitudinal direction of the non-adhesive portion 10. An edge of side sheet 7 in the center side in the width direction is located to the center side in the width direction from a side edge of a narrowest portion 4a of the absorber 4 in the longitudinal section including a region corresponding to a body fluid discharge portion H of a wearer. An edge in the center side in the width direction of the adhesive portion 11 adjacent to the outer side of the non-adhesive portion 10 in the width direction is provided in a position overlapped to or in the vicinity of the side edge of a narrowest portion 4a of the absorber 4.