Pull-on Diaper Elastic Member Placement for Welding Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing method for manufacturing pull-on diapers, where elastic members are divided before heat-sealing, can damage the continuous sheet, leading to insufficient welding strength at the damaged areas.
Innovation Solution
A method involving the continuous manufacturing of pull-on absorbent articles where elastic members are placed to overlap an adhesion area formed on bandlike members, which are then stacked and welded, ensuring sufficient welding strength by controlling the position and contraction of elastic members during the cutting and separation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If elastic members are divided before heat-sealing process, then the side sealings maintain soft feeling and good appearance, but the continuous sheet is damaged by cutting tools leading to insufficient welding strength
Solution Approach 1:
The elastic members are divided at positions upstream before the heat-sealing process, allowing the continuous sheet to remain intact and undamaged during the subsequent heat-sealing operation. This preliminary division prevents the sheet damage that would otherwise occur if cutting were performed after heat-sealing, ensuring both soft side sealings and sufficient welding strength are achieved.
2Ease of operation
If elastic members are stretched in transport direction and then cut, then the elastic members contract towards the adhesion area, but the continuous sheet may be damaged by the cutting process
Solution Approach 1:
The elastic members are divided at positions upstream before the heat-sealing process, allowing the continuous sheet to remain intact and undamaged during the subsequent heat-sealing operation. This preliminary division prevents the sheet damage that would otherwise occur if cutting were performed after heat-sealing, ensuring both soft side sealings and sufficient welding strength are achieved.
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 ensures sufficient welding strength at the side parts of the diapers, preventing damage and maintaining the appearance and softness of the side sealings.
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 is formed
Implementation Method 3
at least some of the plurality of elastic members that are stretched in the transport direction contract in the transport direction towards the adhesion area from positions at which the at least some of the plurality of elastic members are cut
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
There is provided a method for manufacturing an absorbent article, the method including: while a lower bandlike member (15) is transported in a transport direction, a process in which a cutting position (CL) is determined and an adhesion area (HMA) is formed by putting adhesive on each side of the cutting position (CL) of the lower bandlike member (15) in the transport direction; a process in which elastic members (8B, 8F and 8L) are placed so that a part of each of the elastic members (8B, 8F and 8L) overlaps the adhesion area (HMA), the elastic members (8B, 8F and 8L) being stretched in the transport direction; a process in which an upper bandlike member (17) is stacked on and adheres to the lower bandlike member (15) and the elastic member on the adhesion area (HMA); a process in which the lower bandlike member (15) and the upper bandlike member (17) are folded on the center in the intersecting direction; a process in which a welded section (sl) on which the lower bandlike member (15) and the upper bandlike member (17) are to be welded to each other is formed on each side of the cutting position (CL) in the transport direction; a process in which and the lower bandlike member (15), the upper bandlike member (17) and the elastic members (8B, 8F and 8L) are cut together on the cutting position (CL), a lower exterior member (15) and an upper exterior member (17) which are shaped in the form of underpants are cut and separated, the elastic members (8B, 8F and 8L) which are stretched in the transport direction contract towards the adhesion area (HMA) from positions at which the elastic members (8B, 8F and 8L) are cut, the contraction being performed while the elastic members (8B, 8F and 8L) shifting relative to the lower exterior member (15) and the upper exterior member (17)