Elastic Laminate Structure for Low-Force Diaper Ear Stretch
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Solution Overview
Problem
Existing elastic laminates with high elongation strength are uncomfortable to use as 'elastic ears' between side tapes and diapers, lacking a pleasant touch and suitable fit for various users.
Innovation Solution
A multilayer film structure with specific elasticity skin and core layers, bonded with non-woven layers through adhesives or ultrasonic/thermal bonding, and subjected to extension treatment, achieving an elongation strength of less than 20 N/50 mm with 50% elongation at 300 mm/min, and a total film thickness of 26 to 60 μm, with a thickness ratio of 1:10 to 1:25.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an elastic laminate with high elongation strength is used, then the structural integrity is improved, but the comfort and ease of wearing deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the elastomer core layer (40-80 μm) and skin layers (5-20 μm each), and adjusting the composition ratio of olefin polymer to elastomer. These parameter optimizations reduce the elongation strength to less than 20 N/50mm while maintaining sufficient structural integrity for diaper application, resolving the contradiction between strength and wearing comfort.
Solution Approach 2:
The patent uses a composite multilayer structure consisting of elastomer core layers combined with olefin polymer skin layers. This composite material design provides both the necessary elasticity from the elastomer and the mechanical strength from the olefin polymer, achieving a balance between elongation strength and wearing comfort that neither material could provide alone.
2Stability of the object's composition
If the elastomer layer thickness is increased to improve elasticity, then the elasticity is improved, but the film thickness control and manufacturing precision deteriorates
Solution Approach 1:
The patent specifies precise thickness parameters: elastomer core layer of 40-80 μm and skin layers of 5-20 μm each, with total multilayer film thickness of 26-60 μm. These well-defined parameter ranges enable consistent manufacturing while ensuring the required elasticity performance, resolving the contradiction between elasticity and manufacturing precision.
3Strength
If adhesive bonding is used to bond non-woven layers, then the bonding strength is improved, but the manufacturing complexity and process time increases
Solution Approach 1:
The patent replaces adhesive chemical bonding with mechanical bonding methods including ultrasonic bonding and thermal bonding. These methods eliminate the need for adhesive application, drying, and curing processes, thereby reducing manufacturing complexity and cycle time while achieving sufficient bonding strength for the application.
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 laminate provides easy wearing characteristics and a comfortable fit when used as 'elastic ears' in open-type diapers, with improved elasticity and touch sensation.
Implementation Method 1
non-woven layers bonded either (i) through hotmelt pressure-sensitive adhesive layers
Implementation Method 2
non-woven layers bonded either (i) through hotmelt pressure-sensitive adhesive layers or (ii) by means of ultrasonic bonding
Implementation Method 3
non-woven layers bonded either (i) through hotmelt pressure-sensitive adhesive layers or (ii) by means of ultrasonic bonding or thermal bonding
Implementation Method 4
the second elasticity core layer having higher elasticity than the sandwiching first elasticity skin layers
Data Source
AI summary
Provided is an elastic laminate comprising a multilayer film comprising first elasticity skin layers arranged on both sides of a second elasticity core layer, said second elasticity core layer having higher elasticity than the sandwiching first elasticity skin layers, wherein the first elasticity skin layers comprise an olefin polymer, and the second elasticity core layer comprise an elastomer layer, andsaid multilayer film having arranged on both outer surfaces thereof non-woven layers bonded either (i) through hotmelt pressure-sensitive adhesive layers or (ii) by means of ultrasonic bonding or thermal bonding,wherein the elastic laminate is characterized by an elongation strength of less than 20 N/50 mm width when elongated by 50% with 300 mm/min elongation speed.