Extensible Laminar Material Ultrasonic Welding
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Solution Overview
Problem
The production of disposable absorbent sanitary products with elasticized side panels faces challenges due to the complexity and high environmental impact of existing connection formations, which require large quantities of adhesive, leading to increased costs and pollution.
Innovation Solution
A method for producing a transversely extensible elastic laminar web material with a simple structure using non-woven fabrics and an interposed elastomeric layer, where connection formations are applied using minimal adhesive and ultrasonic or thermomechanical welds, eliminating the need for complex Y-shaped designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Y-shaped connection formations with multilayer structure and generous adhesive layers are used, then the connection strength and reliability are improved, but the device complexity and adhesive consumption increase significantly
Solution Approach 1:
The patent extracts the adhesive application to only the critical bonding zones at the interfaces between connection formation layers and side panel material, eliminating the need for generous adhesive layers throughout the entire multilayer structure. This reduces adhesive consumption while maintaining connection strength through strategic placement of minimal adhesive amounts only where structurally necessary.
Solution Approach 2:
The invention applies adhesive locally only at specific bonding interfaces rather than uniformly across all layers. The connection formation uses a simplified single-layer or reduced-layer structure with adhesive applied precisely at the contact points with side panel material, creating localized bonding zones that provide sufficient strength without requiring complex multilayer construction with extensive adhesive coverage.
2Reliability
If Y-shaped connection formations with generous adhesive layers are used, then the connection reliability is improved, but the environmental impact and production costs increase
Solution Approach 1:
The patent removes the excessive adhesive material from the connection formation structure, retaining adhesive only in the minimum necessary quantities at critical bonding interfaces. This extraction of unnecessary adhesive reduces the environmental footprint and pollution associated with adhesive production, application, and disposal while preserving the essential connection strength through targeted adhesive placement.
Solution Approach 2:
The invention discards the practice of using generous adhesive layers throughout the entire connection formation structure, eliminating waste of adhesive material. By producing connection formations with minimal adhesive consumption, the process reduces harmful environmental factors associated with adhesive manufacturing and disposal, while the simplified structure also reduces production costs.
3Reliability
If significant quantities of adhesive are used to produce elasticized side panels, then the manufacturing reliability is improved, but the environmental footprint and production costs increase
Solution Approach 1:
The patent extracts adhesive application to only the essential bonding zones where side panel material interfaces with connection formations, eliminating the need for significant quantities of adhesive. This selective adhesive application maintains reliable side panel attachment through precise local bonding while dramatically reducing overall adhesive consumption and associated environmental impacts.
Solution Approach 2:
The invention implements local quality by applying adhesive only at specific critical bonding interfaces rather than uniformly across all side panel surfaces. This localized adhesive application ensures reliable attachment where structurally necessary while minimizing total adhesive usage, thereby reducing environmental footprint and production costs without compromising attachment reliability.
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
This approach reduces adhesive usage, minimizes environmental impact, and lowers production costs while maintaining the necessary elastic properties and breathability for the sanitary products.
Implementation Method 1
the said elastomeric material is held in position and made to adhere to the first web material by means of the same suction holes 118 connected to the sub-atmospheric pressure source 80 with appropriate vacuum distribution means 119
Implementation Method 2
connection formations are applied using minimal adhesive and ultrasonic or thermomechanical welds
Implementation Method 3
connection formations are applied using minimal adhesive and ultrasonic or thermomechanical welds
Implementation Method 4
the web of elastomeric material 106 contracts itself to return to its original size (at rest), which causes the shrinking of the first and second web materials 102 and 104 forming transverse ripples on them
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A transversely extensible elastic laminar web material 100 comprising - a first and a second web material 102, 104, each of which defines a first and a second distal region 1021, 1022, 1041, 1042 adjacent to corresponding longitudinal side edges 1023, 1024, 1043, 1044 and a central region 1025, 1045 between the aforesaid distal regions 1021, 1022, 1041, 1042, - at least one web of elastomeric material 106 applied to these central regions 1025, 1045 of the first and second web materials 102, 104, and - a plurality of connection formations 160 applied to at least one distal region 1021, 1022, 1041, 1042 of said first and second web materials 102, 104 and projecting from a respective longitudinal edge 1023, 1024, 1043, 1044. In the transversely extensible elastic laminar web material 100, the elastomeric web material 106 and the connection formations 160 are interposed between said first and second web materials 102, 104 and are joined thereto by mechanical welds 355 and 365.