Pull-on Diaper Leg Elastic Attachment via Adhesion Area
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Solution Overview
Problem
Existing methods for manufacturing pull-on diapers face issues with insufficient welding strength on side parts and a higher likelihood of leg elastic members being removed, leading to poor fitting and potential excrement leakage due to damage during the manufacturing process.
Innovation Solution
A method involving the continuous manufacturing of pull-on absorbent articles where leg elastic members are stretched and placed on adhesive areas, sandwiched between exterior members, and then welded and cut in a way that allows them to contract towards the adhesion areas, ensuring they remain attached and providing sufficient welding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If elastic members are divided in advance before welding and cutting processes, then the welded area can prevent contraction and maintain good appearance, but the continuous sheet is likely to be damaged by tools such as a cutter
Solution Approach 1:
The elastic members are divided in advance before the welding and cutting processes to prevent contraction of the welded area. This preliminary division maintains the good appearance of the welded area while avoiding damage to the continuous sheet from cutter tools during subsequent operations.
2Ease of operation
If leg elastic members are provided with greater stretching/contraction force to improve fitting, then the leg openings fit better, but the leg elastic members are less likely to be held on the continuous sheet and may be removed
Solution Approach 1:
The leg elastic members are divided in advance before the welding process. This preliminary division allows the elastic members to be securely attached to the continuous sheet at the divided positions, ensuring they remain held during subsequent operations while maintaining their stretching/contraction force for improved leg opening fitting.
3Ease of manufacture
If the continuous sheet is damaged during the dividing process, then the sheet can be processed, but sufficient welding strength cannot be ensured on the damaged part
Solution Approach 1:
The continuous sheet is divided in advance before welding and cutting operations. This preliminary division allows processing to proceed while minimizing damage to the sheet. The division is performed at positions that avoid critical welding areas, ensuring sufficient welding strength is maintained on undamaged portions of the sheet.
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 method enhances the welding strength of side parts and reduces the likelihood of leg elastic members being removed, improving the fit and preventing excrement leakage by ensuring the elastic members remain securely attached during and after manufacturing.
Implementation Method 1
an adhesion area is formed by putting adhesive on each side of the cutting position in the transport direction
Implementation Method 2
a welded section on which the folded lower bandlike member and the folded upper bandlike member are to be welded to each other
Implementation Method 3
at least some of the plurality of leg elastic members that are stretched in the direction having the component parallel to the transport direction contract in the transport direction towards the adhesion area
Data Source
AI summary
A method for manufacturing an absorbent article, the method including: while a lower bandlike member is transported in a transport direction, a process in which a cutting position is determined and an adhesion area is formed on each side of the cutting position of the lower bandlike member in the transport direction; a process in which leg elastic members are placed so that a part of each of the leg elastic members overlaps the adhesion area, the leg elastic members being stretched in a direction having a component parallel to the transport direction; a process in which an upper bandlike member is stacked on and adheres to the lower bandlike member and the leg elastic member on the adhesion area; a process in which the lower bandlike member and the upper bandlike member are folded on the center in the intersecting direction; a process in which a welded section on which the lower bandlike member and the upper bandlike member are to be welded to each other is formed on each side of the cutting position in the transport direction; a process in which and the lower bandlike member, the upper bandlike member and the leg elastic members are cut together on the cutting position, a lower exterior member and an upper exterior member which are shaped in the form of underpants are cut and separated, the leg elastic members which are stretched contract towards the adhesion area from positions at which the leg elastic members are cut, the contraction being performed while the leg elastic members shifting relative to the lower exterior member and the upper exterior member.