Fibrous Layer Channel Formation via Raised Mold Elements
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Solution Overview
Problem
Current methods for manufacturing fibrous layers with channels for absorbent articles, such as diapers, are inefficient and lack a cost-effective process for producing individual fibrous layers with precise channel formation, which is crucial for proper assembly and distribution of fluids within the article.
Innovation Solution
A process involving continuous fiber deposition in molds connected by sections, where raised elements prevent fiber deposition, creating channels in the fibrous layer, allowing for easier release and precise cutting into individual layers, which can be directly attached to absorbent cores, enhancing registration and assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If discrete unconnected molds are used to make individual fibrous layers, then individual layers can be formed, but release from the mold surface is difficult and registration precision is poor
Solution Approach 1:
The mold surface is segmented into multiple discrete molds arranged along the circumference, each capable of forming individual fibrous layers. This segmentation allows each mold to be independently released and transferred, improving both release ease and registration precision through systematic division of the forming process.
Solution Approach 2:
A transfer belt serves as an intermediary medium between the molds and the final product position. The transfer belt receives fibrous layers from multiple molds and transports them to the assembly position, enabling precise registration while maintaining ease of manufacture through standardized transfer mechanisms.
2Productivity
If channels are formed in fibrous layers for fluid distribution, then fluid distribution performance is improved, but the manufacturing process becomes more complex
Solution Approach 1:
Channels are pre-formed in the fibrous layers during the molding process itself, rather than being created afterward. Raised elements are positioned on the mold surface before fiber deposition, ensuring channels are automatically formed during layer creation, which improves productivity while managing complexity through integrated design.
Solution Approach 2:
The mold surface has different local properties: flat areas for fiber deposition and raised areas for channel formation. This local differentiation allows channels to be formed only where needed without complicating the entire mold structure, maintaining production efficiency while achieving the required complexity only in specific zones.
3Manufacturing precision
If raised elements are added to molds to create channels, then channel formation is achieved, but mold structure becomes more complex
Solution Approach 1:
Instead of creating channels by removing material or adding complex internal structures, the invention inverts the approach by using raised elements to define channel locations. The raised elements prevent fiber deposition in specific areas, naturally forming channels through negative space, which achieves precise channel formation with relatively simple mold structures.
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 process improves the production efficiency of fibrous layers with channels, facilitating better fluid distribution and assembly of absorbent articles by ensuring precise placement and registration of components, thus enhancing the performance and reliability of absorbent articles like diapers.
Implementation Method 1
The molds comprise at least one raised element that hinders fibers deposition in this area so that at least one channel substantially free of fibers corresponding to the raised element is formed in the discrete fibrous layers
Data Source
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AI summary
Process for making discrete fibrous layers (52), comprising the steps of continuously depositing fibers (70) in an endless series of molds (102), with two neighboring molds connected by a connecting section (104), transferring the resulting continuous fibrous layer (52') to another endless moving surface (110) and cutting the continuous fibrous layer at the connecting sections to form discrete fibrous layers (52). The molds comprise at least one raised element (108) that prevents fiber deposition in the raised element area.