Absorbent Body Lattice for Twisting Resistance
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Solution Overview
Problem
Existing absorbent articles become hard and prone to twisting due to increased heat fusion, compromising comfort and effectiveness.
Innovation Solution
An absorbent body comprising a liquid-permeable layer, a liquid-impermeable layer, and an absorbent body with thermoplastic resin fibers exposed on both surfaces and a joint section, providing a tensile strength of 100 Pa or greater, which acts as a lattice to hold cellulose-based water-absorbing fibers and prevent detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat fusion of thermoplastic resin fibers is increased to prevent twisting, then bonding strength between layers is improved, but the absorbent article becomes hard and less comfortable
Solution Approach 1:
The patent applies local quality by creating distinct regions within the absorbent body: the first and second sections contain thermoplastic resin fibers for bonding strength, while the third section contains water-absorbing filler particles for softness and absorption. This spatial differentiation allows the bonding regions to provide strength while the filler-rich region provides softness, resolving the contradiction between bonding strength and hardness.
Solution Approach 2:
The patent uses composite materials by combining thermoplastic resin fibers with water-absorbing filler particles (such as superabsorbent polymers) in specific sections. This composite structure allows the thermoplastic resin to provide bonding strength while the water-absorbing filler provides softness and comfort, thereby resolving the contradiction between strength and hardness.
2Stability of the object's composition
If heat fusion is used to bond absorbent retaining layer and nonwoven fabric layer, then twisting is prevented, but the article becomes hard
Solution Approach 1:
The patent applies local quality by concentrating thermoplastic resin fibers in specific sections (first and second sections) that are responsible for bonding and preventing twisting, while leaving other sections (particularly the third section) rich in water-absorbing filler particles to provide softness. This localized approach allows twisting prevention without overall hardening.
Solution Approach 2:
The patent uses composite materials by combining thermoplastic resin fibers with water-absorbing filler particles in specific sections. The thermoplastic resin provides the stability and resistance to twisting, while the water-absorbing filler provides softness, thereby resolving the contradiction between stability and hardness.
3Strength
If thermoplastic resin fibers are heat-fused together, then structural integrity is improved, but softness is reduced
Solution Approach 1:
The patent applies local quality by creating sections with different compositions: the first and second sections have thermoplastic resin fibers for structural integrity, while the third section has water-absorbing filler particles for softness. This allows the structure to be strong where needed while remaining soft in the absorbent region.
Solution Approach 2:
The patent uses composite materials by combining thermoplastic resin fibers with water-absorbing filler particles. The thermoplastic resin provides structural integrity through heat fusion, while the water-absorbing filler provides softness, thereby resolving the contradiction between structural integrity and softness.
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 absorbent body remains soft while resisting twisting, enhancing comfort and maintaining structural integrity without relying on heat fusion, thus reducing the risk of discomfort and deformation.
Implementation Method 1
the heat sealable synthetic resin fibers in the absorbent retaining layer are tangled or heat-fused together, and the heat sealable synthetic resin fibers in the absorbent retaining layer and the heat sealable synthetic resin fibers in the nonwoven fabric layer are heat-fused
Implementation Method 2
an absorbent body including a liquid-permeable layer, a liquid-impermeable layer and an absorbent body provided between the liquid-permeable layer and the liquid-impermeable layer
Data Source
AI summary
An object of the present disclosure is to provide an absorbent body that is both soft and resistant to twisting. The absorbent body of the present disclosure is as follows. An absorbent body for an absorbent article includes thermoplastic resin fibers and cellulose-based water-absorbing fibers, at least some of the thermoplastic resin fibers have a first section 6′ exposed on a surface of the liquid-permeable layer side of the absorbent body, a second section 6″ exposed on a surface of the liquid-impermeable layer side of the absorbent body and a joint section 6′″ connecting the first section 6′ and second section 6″, and the tensile strength in a thickness direction of the absorbent body is 100 Pa or greater.