Absorbent Article Elastic Member Adhesive Segmentation
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Solution Overview
Problem
The existing methods for manufacturing absorbent articles with elastic members face challenges in accurately forming strong and weak adhesive units, leading to difficulties in retaining the elastic member's position and shape, which can result in discomfort and impaired comfort during wear.
Innovation Solution
The method involves applying an adhesive agent to the elastic member in a stretched state, with alternating application regions and non-application regions, and using a sheet member with a lower basis weight to secure the elastic member in both stretched and non-stretched states, ensuring proper positioning and shape retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an adhesive agent is applied to one of the sheets while varying the amount of application, then strong adhesive units and weak adhesive units are formed, but it is difficult to adjust the amount of application at the boundary between strong and weak adhesive units, making it hard to form them clearly distinctively
Solution Approach 1:
The adhesive application is segmented into distinct regions: strong adhesive units with high adhesive agent concentration, weak adhesive units with low adhesive agent concentration, and non-adhesive units with no adhesive agent. This segmentation is achieved by controlling the adhesive agent discharge to create clearly defined boundaries between different adhesive strength zones, resolving the contradiction by making the boundaries distinct rather than gradual.
Solution Approach 2:
Different regions of the sheet are given different adhesive qualities through localized application of the adhesive agent. The strong adhesive units receive sufficient adhesive agent for secure bonding, the weak adhesive units receive minimal adhesive agent for partial bonding, and non-adhesive units receive no adhesive agent. This local differentiation creates clear boundaries between regions of different adhesive strengths.
2Manufacturing precision
If different kinds of adhesive agents with different adhesive forces are alternately disposed, then strong and weak adhesive units are formed, but there is a need to respectively control applying devices for two kinds of adhesive agents, increasing device complexity
Solution Approach 1:
A single adhesive application device is designed to perform multiple functions by controlling the discharge amount of one type of adhesive agent. The device can switch between dispensing high amounts for strong adhesive units, low amounts for weak adhesive units, and zero amounts for non-adhesive units. This universal approach eliminates the need for separate application devices for different adhesive types while maintaining clear differentiation between adhesive unit strengths.
3Ease of manufacture
If an adhesive agent is discontinuously applied to a sheet, then strong adhesive units are formed, but the adhesive agent is not applied to weak adhesive units, causing the elastic member to move outside or shrink too much when cut
Solution Approach 1:
The adhesive agent is applied with locally differentiated qualities: strong adhesive units receive sufficient adhesive agent to securely retain the elastic member, while weak adhesive units receive minimal adhesive agent that provides enough adhesion to prevent excessive movement or shrinkage during cutting, but not enough to prevent the elastic member from shrinking as intended. This local quality control ensures both ease of manufacture and reliability of elastic member positioning.
4Manufacturing precision
If adhesive agent is applied to secure the elastic member in the stretched state, then the elastic member is retained at the intended position, but additional adhesive application steps are required, complicating the manufacturing process
Solution Approach 1:
The adhesive application process is merged into a single integrated step where the adhesive agent is applied in varying amounts to create strong, weak, and non-adhesive units in one pass. This combines multiple adhesive application functions (securing stretched elastic members, allowing controlled shrinkage, and creating non-adhesive regions) into one manufacturing operation, maintaining positioning accuracy while improving productivity by eliminating additional adhesive application steps.
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 approach allows for effective alternation of elastic member states, preventing displacement and discomfort, while simplifying the manufacturing process by eliminating the need for additional adhesive application steps, thereby enhancing the wear experience and product quality.
Implementation Method 1
The elastic member that has been in the stretched state at the weak adhesive unit shrinks
Data Source
AI summary
An absorbent article is provided with a central elastic material for positioning in a state in which it is extended in the front/rear direction in the outer direction in relation to an absorbent body, and an elastic material cover sheet which abuts the outer direction side surface of the central elastic material. The elastic material cover sheet covers an extension region where the central elastic material is positioned in an extended state, and a non-extension region where the central elastic material is positioned in a non-extended state. An adhesive agent for fixing in the extended state is coated onto the central elastic material of the extension region. An adhesive agent is coated onto at least the non-extension region of the outer direction side surface of the elastic material cover sheet, and the adhesive agent coated onto the outer direction side surface penetrates to the inner direction side surface of the elastic material cover sheet.