Absorbent Core Patterned Particulate Deposition via Vacuum Suction
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Solution Overview
Problem
Current methods for producing patterned particulate sandwiches in absorbent articles face challenges in achieving a well-defined pattern at high production speeds and ensuring effective immobilization and liquid distribution, while maintaining absorbency and preventing obstruction by particulate material.
Innovation Solution
A process involving a carrier and cover material with a support pattern, where particulate material is deposited into indentations formed by vacuum suction, allowing for precise placement and bonding without particulate material in the bonding regions, enabling high-speed production of sandwich structures with optimized absorbency and liquid handling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rotating mask or linearly moving mask is used to deposit particulate material in a pattern, then a defined pattern can be achieved, but the production speed is limited and the process complexity increases
Solution Approach 1:
The patent replaces the mechanical mask system (rotating or linearly moving) with a stationary support means that has a support pattern. The carrier material is moved continuously at high speed over this stationary pattern, and the particulate material is deposited through the support pattern onto the moving carrier material. This substitution of the mechanical deposition system with a stationary template approach enables high-speed continuous production while maintaining precise pattern definition.
2Reliability
If pockets of absorbent material are provided to confine particulate material, then immobilization is improved, but the free distribution of liquid to absorbent areas is hindered
Solution Approach 1:
The patent applies local quality by creating a non-homogeneous distribution of particulate material in specific patterns rather than uniform confinement in pockets. The support pattern allows particulate material to be positioned only where needed, leaving other areas open for liquid distribution. This localized placement achieves immobilization in critical areas while maintaining liquid flow paths in non-critical areas, eliminating the harmful effect of pocket-based confinement.
3Reliability
If high amounts of cellulosic material are used to achieve good immobilization of absorbent polymer material, then the immobilization effect is improved, but the quantity of material and cost increase
Solution Approach 1:
The patent changes the parameter of particulate material distribution from uniform/high-quantity confinement to patterned/precise placement. By using a support pattern that defines specific deposition areas, the system achieves effective immobilization with significantly reduced quantities of particulate material. The material is placed only where functional immobilization is required, rather than using excessive cellulosic material to confine it throughout the entire structure.
4Manufacturing precision
If the carrier material is deformed by vacuum suction to form indentations, then precise particulate material placement is achieved, but the device complexity increases
Solution Approach 1:
The patent uses pneumatic principles (vacuum suction) to deform the carrier material and form indentations that receive the particulate material. The support means creates a vacuum pattern that selectively deforms the carrier material in the support pattern areas, forming precise receptacles for the particulate material. This pneumatic approach achieves high placement precision without requiring complex mechanical deformation systems, as the vacuum field naturally creates the necessary indentations through pressure differential.
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 process enables the creation of sandwich structures with well-defined patterns of particulate material, ensuring effective immobilization and liquid distribution, while maintaining high production speeds and preventing obstruction, thus enhancing the absorbency and performance of absorbent articles.
Implementation Method 1
The carrier material is deformed by a carrier holding means such that indentations are formed in the unsupported regions. The particulate material is transferred to the carrier material into the indentations
Implementation Method 2
The cover material and the carrier material are combined and affixed by a fixation means with the particulate material positioned there between
Data Source
AI summary
The present invention is method for forming a sandwich structure having a pattern of particulate material enveloped between a carrier material and a cover material. The method allows accurate forming of pre-determined pattern at high production speed. Such a method is particularly useful in the manufacture of disposable absorbent articles, such as baby diapers.