Composite Nonwoven Backsheet for Soft Absorbent Articles
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Solution Overview
Problem
Conventional absorbent article backsheets made from polypropylene nonwoven webs and LLDPE films are rigid and lack a cloth-like feel, while LLDPE films are not strong or durable, necessitating a solution for a soft and cloth-like feel without compromising durability or strength.
Innovation Solution
A composite nonwoven facing is created with a first polyolefin composition containing ethylene polymer and a second polyolefin composition comprising rigid and ductile propylene polymers, which are laminated together to form a backsheet that provides a soft and cloth-like feel while maintaining strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polypropylene nonwoven web is used for backsheet, then durability and strength are improved, but softness and cloth-like feel deteriorate
Solution Approach 1:
The backsheet uses a composite structure combining polypropylene nonwoven web (providing strength and durability) with LLDPE film (providing softness and cloth-like feel). This composite material approach allows both materials to contribute their respective advantages, resolving the contradiction between durability and softness.
2Object-generated harmful factors
If LLDPE film is used for backsheet, then softness and cloth-like feel are improved, but strength and durability deteriorate
Solution Approach 1:
The backsheet uses a composite structure combining polypropylene nonwoven web (providing strength and durability) with LLDPE film (providing softness and cloth-like feel). This composite material approach allows both materials to contribute their respective advantages, resolving the contradiction between durability and softness.
3Strength
If polypropylene nonwoven web is oriented inwardly, then strength is improved, but garment-facing surface softness deteriorates
Solution Approach 1:
The backsheet uses a composite structure where the LLDPE film defines the garment-facing surface (providing softness) while the polypropylene nonwoven web is positioned adjacent to it (providing strength). This arrangement resolves the contradiction by allowing each material to fulfill its optimal function in the composite structure.
Data Source
Figure 1
AI summary
An absorbent article having an outwardly body-facing surface and an outwardly garment- facing surface Is provided. The absorbent article contains a topsheet, backsheet, and an absorbent core positioned between the topsheet and the backsheet. The backsheet contains a nonwoven facing laminated to a film. The nonwoven facing contains a first nonwoven web containing a plurality of fibers formed from a first polyoiefin composition and a second nonwoven web containing a plurality of fibers formed from a second polyoiefin composition. The first polyoiefin composition contains at least one ethylene polymer and the second polyoiefin composition contains at least one rigid propylene polymer and at least one ductile propylene polymer. The second nonwoven web defines the garment- facing surface of the article.