Absorbent Core Forming Surface with Segmented Suction Chambers
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Solution Overview
Problem
Biodegradable SAP powders with fine particle sizes pose challenges in retaining them within the cellulose fibre matrix during the production of absorbent sanitary articles, leading to losses during the production process.
Innovation Solution
An apparatus and method involving a forming surface that moves through three forming positions, with supply ducts and suction chambers to deposit and compact layers of absorbent material, including loose fibres and biodegradable SAP powders, to form a stable absorbent core that prevents powder dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If biodegradable SAP powders with fine particle size are used, then the absorbent core can absorb body fluids effectively, but the fine particles are difficult to retain within the cellulose fibre matrix and are lost during production
Solution Approach 1:
The patent divides the absorbent core formation into three separate forming positions, each with its own supply duct and suction chamber. This segmentation allows controlled deposition and compaction of absorbent material at different stages, preventing fine SAP particles from being lost during the formation process while maintaining high absorbent capacity.
Solution Approach 2:
The patent applies preliminary compaction action through suction chambers at each forming position before the final transfer of the semi-finished product. This preliminary action secures the fine SAP particles within the cellulose fibre matrix during the formation process, preventing their loss during subsequent handling and transfer operations.
2Device complexity
If a single forming position is used, then the production process is simpler, but the fine SAP particles are lost during transfer and suction vacuum
Solution Approach 1:
The forming process is segmented into three distinct forming positions, each equipped with supply ducts and suction chambers. This segmentation enables controlled deposition and immediate compaction of absorbent material at each position, preventing SAP particle loss during transfers between positions while maintaining reasonable device complexity.
Solution Approach 2:
The patent introduces suction chambers as intermediary elements between supply ducts and the forming surface. These suction chambers act as mediators that compact the absorbent material and retain fine SAP particles during the forming process, preventing their loss during transfers between forming positions.
3Reliability
If multiple supply ducts and suction chambers are used, then SAP particles are retained effectively, but the device complexity increases
Solution Approach 1:
The apparatus is segmented into three forming positions with corresponding supply ducts and suction chambers. This segmentation provides reliable SAP particle retention through controlled compaction at each position while organizing the complexity in a systematic, manageable structure that follows the production flow.
Solution Approach 2:
Each forming position with its supply duct and suction chamber serves multiple functions: depositing absorbent material, compacting the material to retain fine SAP particles, and preparing the material for transfer to the next position. This multi-functionality reduces overall device complexity by consolidating operations at each position.
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 method effectively retains biodegradable SAP powders within the absorbent core, preventing losses during production and achieving a stable absorbent core that enhances the sanitary article's performance in absorbing body fluids without leaks.
Implementation Method 1
a first suction chamber is provided opposite to said first supply duct with respect to said forming surface. said first suction chamber is open on said forming surface and configured to exert a suction through said forming surface
Data Source
AI summary
An apparatus and method for producing an absorbent sanitary article including a forming surface at least partially permeable to air configured to move along a moving direction between first, second, and third successive forming positions. The apparatus includes a first, second, and third supply ducts for delivering loose absorbent material onto the forming surface at the first, second, and third forming positions, respectively. The apparatus further includes a first suction chamber opposite to the first supply duct with respect to the forming surface and arranged at the first forming position, a second suction chamber opposite to the second supply duct and arranged at the second forming position, and a third suction chamber opposite to the third supply duct at the third forming position. The first, second, and third suction chambers are open on the forming surface and configured to exert a suction through the forming surface.