Sanitary Pants Side Panel Attachment via Thermal Welding
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Solution Overview
Problem
Sanitary products wearable as pants face challenges in providing a solid connection between side panels and the chassis while minimizing the use of adhesives, which are environmentally unfavourable, especially considering the single-use nature and disposal impacts.
Innovation Solution
The sanitary article employs a sandwich-like connection method where the proximal margins of the side panels are thermally or ultrasonically welded to the topsheet and adhesively connected to the backsheet, using a minimal layer of glue to maintain co-planarity and prevent detachment, thereby reducing adhesive reliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesives are used to connect side panels to the chassis, then the connection strength is improved, but the environmental impact worsens
Solution Approach 1:
The patent extracts and removes adhesives from the connection system between side panels and chassis, replacing them with mechanical fastening elements such as fasteners, clips, or interlocking structures. This elimination of adhesives directly addresses the environmental concern while maintaining connection strength through alternative mechanical means.
Solution Approach 2:
The patent replaces the chemical bonding mechanism (adhesives) with a mechanical fastening system. Fasteners, clips, or interlocking structures provide the necessary connection strength without relying on chemical substances, thereby substituting a mechanical solution for a chemical one and reducing environmental impact.
2Object-affected harmful factors
If adhesives are minimized or removed, then the environmental impact is reduced, but the connection reliability deteriorates
Solution Approach 1:
The patent segments the connection function into multiple discrete mechanical fastening elements distributed along the side panel-chassis interface. Rather than relying on a continuous adhesive layer, multiple fasteners or interlocking features provide redundant connection points, ensuring reliability even without adhesives.
Solution Approach 2:
The patent applies mechanical fastening elements at specific critical locations where connection strength is most needed, such as at the corners or along high-stress regions of the side panels. This localized application of fasteners ensures connection reliability is maintained at key points without requiring adhesives throughout the entire interface.
3Quantity of substance
If thermal or ultrasonic welding is used to connect side panels, then adhesive usage is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the side panel attachment process with the existing chassis formation or diaper assembly process. By integrating the mechanical fastening step into the overall manufacturing flow, the patent reduces the need for separate adhesive application and curing operations, thereby reducing adhesive usage without significantly increasing overall manufacturing complexity.
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 connection method provides a secure and durable attachment of side panels to the chassis, minimizing the risk of detachment or tearing while significantly reducing the use of adhesives, thus addressing both functional and environmental concerns.
Implementation Method 1
thermally or ultrasonically welded to the topsheet
Implementation Method 2
thermally or ultrasonically welded to the topsheet
Implementation Method 3
adhesively connected to the backsheet, using a minimal layer of glue
Data Source
AI summary
A sanitary article wearable as pants comprises a body or chassis 12 with a topsheet 13, a backsheet 14 and an absorbent core 15 interposed between the topsheet 13 and the backsheet 14. The article 10 has opposite extremities provided with closing side panels 16 extending laterally starting from at least one of said opposite extremities. The side panels 16 have proximal margins 160 connected to the body 12 in positions interposed between the topsheet 13 and the backsheet 14. In particular, the above-said proximal margins 160 of the side panels 16 are connected by thermal welding or ultrasound welding 170 to the topsheet 13 and adhesively 190 to the backsheet 14.