Absorbent Core Alignment via Drum Transfer and Stacking
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Solution Overview
Problem
Existing methods for manufacturing absorbent cores in disposable wearable articles often result in layers being out of alignment during transportation and use due to simple overlapping techniques.
Innovation Solution
The use of a feed device and two drums with distinct areas for forming thick and thin portions, where the thick portion is transferred to the area of the first drum and the thin portion is formed around it, ensuring alignment by guiding the fibers through duct portions and utilizing inhibition areas to prevent misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two absorbent layers are laminated together onto a belt member by simple overlapping, then the manufacturing process is simple, but the two layers are likely to be out of alignment during transporting or using the absorbent article
Solution Approach 1:
The patent introduces a belt member as an intermediary carrier that receives both the first and second absorbent layers. The layers are laminated onto the belt member in a controlled manner, and the belt member transports them to the cutting section, ensuring alignment is maintained throughout the process.
Solution Approach 2:
The first absorbent layer is formed and positioned on the belt member before the second absorbent layer is added. This preliminary positioning establishes a reference framework that guides the subsequent lamination of the second layer, ensuring proper alignment before the layers are combined.
2Shape
If one absorbent layer has a smaller area than the other to create different thickness portions, then the thickness variation is achieved, but the layers become more prone to misalignment
Solution Approach 1:
The patent creates local quality variations by forming the second absorbent layer with a smaller area than the first layer. This results in different thickness portions in the absorbent core, with the overlapping region being thicker and the non-overlapping region being thinner, tailored to specific functional requirements.
Solution Approach 2:
The belt member serves as a template or copying surface that replicates the desired shape and alignment of the absorbent layers. By laminating both layers onto the same belt member, the alignment pattern is copied and maintained across the entire length of the absorbent article.
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 effectively prevents the thick and thin portions from becoming out of alignment, resulting in a stable and consistently formed absorbent core for disposable wearable articles.
Implementation Method 1
the first drum (1) is provided with a first area α1, where the crushed fiber F is sucked and made to cling to an outer circumferential portion 10 of the first drum (1) and stacked
Data Source
Figure 1A~1C
Figure 2A~2C
AI summary
A method for manufacturing an absorbent core uses a feed device 3 feeding crushed fiber F, a first drum 1 provided with a first area α1, where the crushed fiber is sucked and stacked, and a second drum 2 provided with a second area α2, where the crushed fiber F is sucked stacked, the second area α2 being smaller than the first area α1, the method includes a step of forming a thick portion C2 on the second area α2 of the second drum 2 by stacking the fiber F fed from the feed device 3; a step of transferring the thick portion C2 to a predetermined position in the first area α1; and a step of forming a thin portion C1 on the first area α1 of the first drum 1 by stacking the fiber F fed from the feed device 3 around the transferred thick portion C2 with the transferred thick portion C2 placed on the first area α1.