Segmented Vacuum Cavity Surface for Absorbent Core Transfer
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Solution Overview
Problem
Existing methods for producing absorbent cores with fibers and superabsorbent polymer particles face challenges in achieving accurate and consistent transfer at high speeds, especially when using small cavities or fine particulate material, leading to incomplete filling and inconsistencies in the absorbent core formation.
Innovation Solution
The apparatus features a moving endless surface with primary and secondary cavities, where primary cavities are connected to a vacuum system in the transferring zone for accurate transfer, and secondary cavities are not, with additional vacuum connectivity in the receiving zone to enhance airflow and stabilize vacuum suction, allowing for continuous and accurate filling even at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum is applied to all cavities in the transferring zone, then accurate filling of cavities is achieved, but airflow becomes insufficient when cavities are small or material is fine particulate
Solution Approach 1:
The cavity system is segmented into two distinct groups: primary cavities connected to vacuum sources for accurate material pickup, and secondary cavities not connected to vacuum for maintaining airflow. This segmentation allows each cavity type to serve its specific function without interfering with the other, resolving the contradiction between filling accuracy and airflow sufficiency.
Solution Approach 2:
Different vacuum connectivity conditions are applied to different locations on the moving surface: primary cavities have vacuum connectivity for precise material reception, while secondary cavities have no vacuum connectivity to maintain airflow. This local differentiation of vacuum application ensures that each region of the surface optimizes for its specific operational requirement.
2Productivity
If process speed is increased to high speeds, then productivity is improved, but material build-up occurs above cavities reducing vacuum airflow
Solution Approach 1:
By segmenting cavities into primary (vacuum-connected) and secondary (vacuum-disconnected) groups, the system can operate at high speeds without material build-up interfering with vacuum airflow. The secondary cavities act as overflow receptacles that do not compete for vacuum suction, allowing rapid material deposition without compromising the vacuum supply to primary cavities.
3Manufacturing precision
If small cavities are used for accurate transfer, then manufacturing precision is improved, but filling accuracy deteriorates at high speeds
Solution Approach 1:
The cavity population is segmented into primary small cavities for precise material transfer and secondary cavities for bulk material acceptance. This segmentation allows small primary cavities to maintain their high precision capability while secondary cavities provide a buffer that prevents material build-up from compromising filling consistency at high speeds.
Solution Approach 2:
The system changes the operational parameters of different cavity groups: primary cavities operate with vacuum connectivity and small dimensions for precision, while secondary cavities operate without vacuum connectivity and can be larger for high-speed material acceptance. This parameter differentiation resolves the contradiction between precision and reliability at high speeds.
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 solution ensures consistent and accurate filling of cavities, improving the formation of absorbent cores by maintaining stable vacuum suction and airflow, even at high production rates and with small or fine particulate materials.
Implementation Method 1
a vacuum system (71B) in said transferring zone (B) for retention of said first portion of solid material (100a) during transfer
Implementation Method 2
it is important that the vacuum/air flow through the cavities and/or solid materials is about constant, and/or that it is important that the vacuum/ air flow per surface area is sufficient and about constant
Data Source
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AI summary
An apparatus and method is claimed with a with receiving zone, for receiving solid material, a transferring zone, for transferring said solid material and optionally a releasing zone for releasing said solid material, e.g. to another moving surface and with a moving endless surface moving in and through said zones, said a moving endless surface has thereto a multitude of primary cavities and secondary cavities receiving said solid material, whereby said primary cavities are connectable/connected to said vacuum system of said transferring zone, and said secondary cavities are not connectable/connected to said vacuum system of said transferring zone, and whereby thus only said primary cavities transfer said solid material e.g. to said further moving surface; and whereby typically both primary and secondary cavities are connectable/ connected to a vacuum system in said receiving zone.