Absorbent Sheet Polymer Fixing Proportion and Adhesive Elasticity
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Solution Overview
Problem
Conventional absorbent sheets suffer from low fixing performance of absorbent polymer to the base sheet, leading to detachment during liquid absorption, which results in reduced absorption performance, potential liquid leakage, and discomfort due to particle clustering and gritty feelings.
Innovation Solution
An absorbent sheet design where absorbent polymer is fixed to one surface of the base sheet with a high fixing adhesive, ensuring a 40% or more absorbent polymer fixing proportion, using a flexible adhesive that extends with swelling and maintains attachment even under external forces, preventing detachment and enhancing absorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If absorbent polymer particles are fixed to the base sheet using conventional hot-melt adhesive, then the adhesive can extend to follow expansion of swelled absorbent polymer, but the fixing proportion remains low causing detachment during liquid absorption
Solution Approach 1:
The patent changes the physical and chemical parameters of the adhesive by selecting specific types (acrylic elastomer, rubber adhesive, or silicone-based hot-melt adhesive) with appropriate elasticity and adhesion properties. This parameter optimization enables the adhesive to maintain strong bonding while extending with the swelling absorbent polymer, achieving a fixing proportion of 40% or more and preventing detachment during liquid absorption.
2Quantity of substance
If a large amount of absorbent polymer is applied to achieve high absorption capacity, then the absorption performance improves, but the weight and bulkiness of the absorbent sheet increases
Solution Approach 1:
The patent uses a thin base sheet (0.03-0.8 mm thickness) made of nonwoven fabric or resin film as a flexible support structure. This thin film approach minimizes the weight and bulkiness of the absorbent sheet while allowing sufficient absorbent polymer to be fixed on one surface to achieve the required absorption capacity.
3Reliability
If absorbent polymer is fixed to both surfaces of the base sheet, then the fixing proportion increases, but the absorption performance decreases due to reduced gap formation
Solution Approach 1:
The patent applies absorbent polymer to only one surface of the base sheet rather than both surfaces. This local application strategy ensures that the absorbent polymer can swell and form gaps between particles and the base sheet, maintaining high absorption performance while achieving sufficient fixing proportion (40% or more) on the applied surface.
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 sheet effectively maintains absorbent polymer attachment during liquid absorption, preventing leakage and discomfort, while enhancing absorption performance and maintaining product fit by forming a gap due to base sheet bending, thus ensuring stable and efficient liquid management.
Implementation Method 1
absorbent polymer is fixed to a base sheet with a base sheet fixing adhesive interposed therebetween
Implementation Method 2
absorbent polymer particles has been already detached from the base sheet because of swelling of the absorbent polymer particles caused by absorption of body fluid such as urine
Data Source
AI summary
An absorbent member (20) includes an absorbent sheet (10) in which absorbent polymer (12) is fixed to a base sheet (11) and a cover sheet (21) covering at least a first surface of the absorbent sheet (10). The absorbent sheet (10) has an absorbent polymer fixing proportion of 40% or more. The absorbent member (20) has high fixing performance of the absorbent polymer (12) to the base sheet (11) and is less likely to suffer from detachment of the absorbent polymer (12) even after liquid absorption. The absorbent polymer (12) is preferably fixed to the base sheet (11) with a base sheet fixing adhesive (13) interposed therebetween. The adhesive (13) is preferably an acrylic, silicone-based or rubber-based adhesive, and is preferably a hot-melt adhesive.