Pants Diaper Print Retention via Composite Nonwoven
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Solution Overview
Problem
Conventional pants-type disposable diapers with visible designs lack advanced designability, and existing solutions do not effectively maintain printed designs during production and use.
Innovation Solution
A pants-type disposable diaper featuring an exterior member with a nonwoven fabric outer sheet containing a meltblown nonwoven layer and a printed design on the skin-facing side, which enhances visibility and durability of the design, combined with a spunbonded nonwoven inner sheet for flexibility and inconspicuousness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a printed design is applied to the outer sheet of the exterior member, then designability and aesthetic appeal are enhanced, but the printed design may be lost or deteriorated during production and use
Solution Approach 1:
The outer sheet is constructed as a composite nonwoven fabric comprising a hydrophobic layer and a hydrophilic layer. This composite structure allows the printed design to be applied to the hydrophobic layer's outer surface, where it is protected from water and moisture that would otherwise cause deterioration or loss of the print during production and use
Solution Approach 2:
The nonwoven fabric exhibits local quality differentiation with a hydrophobic layer on the outer surface for print stability and a hydrophilic layer on the inner surface for absorbency. This local functional differentiation allows the printed design to be preserved on the outer surface while the inner surface maintains its absorbent properties
2Manufacturing precision
If the outer sheet is made with a fine fiber layer like a film to improve print visibility, then design clarity is enhanced, but flexibility and comfort may be reduced
Solution Approach 1:
The nonwoven fabric provides local quality differentiation where the outer surface has fine fibers for clear print visibility, while the overall structure maintains the flexibility and softness characteristic of nonwoven fabrics. The printed design is applied to this fine-fiber outer surface, achieving both clarity and comfort
Solution Approach 2:
The nonwoven fabric's physical parameters are optimized to provide sufficient fineness for clear print visibility while maintaining adequate flexibility. The composite structure of hydrophobic and hydrophilic layers allows the outer surface to be sufficiently fine for print clarity without compromising the overall flexibility needed for comfort
Data Source
AI summary
A pants-type disposable diaper (1) having a front body part (P), a back body part (Q) and a crotch part (R) positioned therebetween and formed in a pants shape, comprising an absorbent body (7) situated at least at the crotch part (R) and comprising a top sheet, a back sheet and an absorbent core (10) disposed therebetween, and an exterior member (2) provided on an outer side of the absorbent body (7) and situated at least at the front body part (P) and the back body part (Q), wherein the exterior member (2) comprises an outer sheet (5) and an inner sheet (6) provided on a skin-facing side of the outer sheet (5), and the outer sheet (5) is made of a nonwoven fabric having a meltblown nonwoven layer and a printed part is provided to the skin-facing side of the outer sheet (5).