Disposable Diaper Bulk Reduction via Offset Core and Printed Backsheet
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Solution Overview
Problem
Disposable diapers are often bulky, reducing wearer comfort and can be expensive, especially in low-income markets, while also facing issues of opacity and perceived quality due to reduced absorbent material in the back waist region leading to see-through and concerns about absorbency and leakage.
Innovation Solution
A disposable diaper design with an absorbent core offset by at least 10% from the chassis back waist edge, a backsheet with a high percentage of printed surface area in the back waist region to address opacity, and a topsheet with opacity of at least 15% to enhance absorbency perception and reduce leakage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If absorbent material is reduced in the back waist region to reduce bulk and cost, then manufacturing cost and bulk are reduced, but opacity and perceived quality deteriorate causing see-through and consumer concerns
Solution Approach 1:
The patent applies a printed pattern on the backsheet in the back waist region to increase opacity and prevent see-through issues. The printed design covers the area where absorbent material is reduced, maintaining visual quality and consumer perception of product quality while allowing bulk reduction through optimized absorbent distribution.
Solution Approach 2:
The patent implements non-uniform absorbent material distribution along the longitudinal axis, with reduced absorbent material in the back waist region (within 25% from the back waist edge) and full absorbent material in the crotch and front waist regions. This local optimization reduces overall bulk while maintaining necessary absorbency in critical areas.
2Ease of manufacture
If absorbent material is reduced in the back waist region to reduce cost, then manufacturing cost is reduced, but reliability deteriorates due to potential leakage concerns
Solution Approach 1:
The patent concentrates absorbent material in the crotch and front waist regions where liquid contact and absorption needs are highest, while reducing or eliminating absorbent material in the back waist region where liquid contact is minimal. This strategic local distribution maintains leakage resistance in critical areas while reducing overall material cost.
Solution Approach 2:
The patent provides sufficient absorbent material in the critical crotch and front waist regions to ensure complete absorption and prevent leakage, while using minimal or no absorbent material in the back waist region. This partial action approach ensures reliability where needed while optimizing cost through selective material placement.
3Volume of moving object
If absorbent material is reduced to reduce bulk, then bulk is reduced improving comfort, but perceived quality deteriorates due to see-through concerns
Solution Approach 1:
The patent uses a printed pattern on the backsheet in the back waist region to mask the reduced absorbent material and prevent see-through issues. The printed design maintains visual appeal and perceived quality while allowing the product to benefit from reduced bulk through optimized absorbent distribution.
Solution Approach 2:
The patent reduces absorbent material specifically in the back waist region (within 25% from the back waist edge) while maintaining full absorbent material in the crotch and front waist regions. This localized reduction decreases overall bulk and improves comfort while the printed pattern on the backsheet maintains perceived quality in the reduced area.
Data Source
AI summary
A disposable diaper is disclosed having reduced bulk, especially in the back waist region. Due to an opaque topsheet and a backsheet having a relatively high percentage of printed surface area, the diaper has reduced see-through even in those areas of the back waist region where no absorbent core is comprised.