Elastic Part Transfer Aperture Geometry for Absorbent Articles
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Solution Overview
Problem
During the manufacturing of absorbent articles, elastic laminates often face issues with reorientation and transfer while maintaining a stretched condition, leading to problems such as sticking and snagging on vacuum drum apertures, which affects subsequent assembly operations.
Innovation Solution
A transfer assembly with a carrier surface featuring apertures that are oriented and configured to prevent contraction of elastic parts while allowing them to slide off without snagging, utilizing elongate apertures with side edges longer than end edges to counteract contraction and facilitate smooth transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If vacuum pressure is applied through apertures in the drum to hold the elastic laminate in a stretched state, then the elastic laminate can be maintained in a stretched condition during reorientation, but portions of the elastic laminate become stuck or snagged on the aperture edges during transfer operations
Solution Approach 1:
The aperture edges are selectively modified (chamfered or rounded) only at specific locations where the elastic laminate makes contact during transfer, while other portions of the aperture edges remain unchanged. This localized modification reduces snagging at critical points without affecting the overall vacuum holding capability of the drum apertures.
Solution Approach 2:
The aperture edges are pre-modified with chamfers or rounded profiles before the elastic laminate is applied to the drum. This preliminary preparation of the aperture geometry prevents the elastic laminate from catching on sharp edges during subsequent transfer operations, while maintaining the vacuum seal necessary for holding the stretched condition.
2Ease of operation
If vacuum pressure is reduced to mitigate sticking problems, then transfer operations become smoother, but the ability of the rotating drum to hold the elastic laminate in the desired stretched condition is adversely affected
Solution Approach 1:
The solution applies local quality by modifying only specific portions of the aperture edges (chamfering or rounding) rather than changing the overall vacuum pressure. This localized geometric modification allows the vacuum pressure to remain sufficiently high to maintain the stretched condition while preventing snagging at the modified edge regions where contact occurs during transfer.
3Ease of operation
If aperture edges are chamfered to reduce snagging, then transfer operations improve, but the vacuum holding capability of the apertures is reduced
Solution Approach 1:
Chamfering is applied selectively to specific portions of the aperture edges where the elastic laminate makes contact during transfer operations, rather than modifying the entire aperture perimeter. This localized chamfering reduces snagging at critical contact points while preserving the vacuum seal integrity of the majority of the aperture surface.
Solution Approach 2:
The aperture edge is segmented into different functional zones: a modified zone (chamfered or rounded) for smooth transfer contact, and an unmodified zone for maintaining vacuum seal integrity. This segmentation allows the aperture to simultaneously provide both smooth transfer characteristics and reliable vacuum holding capability.
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 solution effectively maintains the stretched condition of elastic parts during reorientation and transfer, reducing issues of sticking and snagging, thereby enhancing the assembly process efficiency and product quality.
Implementation Method 1
vacuum pressure may cause portions of the elastic laminate to be partially pushed into the apertures in order to help hold the length elastic laminate on the outer surface a fixed position
Data Source
Figure 1
Figure 1A~2B
Figure 1B~1C
AI summary
The present disclosure relates to assembling, advancing, reorienting, and/or transferring stretched elastic parts during the assembly of absorbent articles. As described herein, a transfer assembly reorients a stretched elastic part from a first orientation, wherein the direction of stretch is generally parallel to the machine direction, to a second orientation, wherein the direction of stretch is generally perpendicular to the machine direction. The reoriented elastic part is then transferred to a carrier while maintaining the stretched condition of the elastic part. The orientation and/or configuration of vacuum apertures in a carrier surface relative to the direction of stretch of the elastic part and relative to the machine direction helps to prevent the elastic part from contracting, while at the same time helps to allow the elastic part to slide off the carrier surface without snagging and/or sticking to aperture perimeter edges.