High Speed Cross Folding of Discrete Items Using Vacuum Drums
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Solution Overview
Problem
Current diaper manufacturing processes face inefficiencies in folding discrete components at high speeds, leading to waste and quality issues, particularly in web-based operations where precise folding is required for packaging and product integrity.
Innovation Solution
The use of a system involving rotating vacuum drums and folding fingers to convey and fold discrete items, such as diapers, by controlling the movement and orientation of the items with vacuum ports and rotating belts, allowing for efficient longitudinal and cross-folding of diapers to minimize waste and improve production quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional folding methods are used for discrete items on a production line, then the process is simpler, but the folding speed is slow and waste increases
Solution Approach 1:
The folding process is divided into distinct segments: pickup by vacuum drum, transfer to folding finger, folding action, and deposition. This segmentation allows each component to be optimized for its specific function, enabling high-speed operation while minimizing material waste through precise control.
Solution Approach 2:
The folding finger acts as an intermediary between the vacuum drum and the final folded position. This mediator enables the discrete item to be folded at high speed by providing a controlled folding surface that works in coordination with the rotating vacuum drum, improving productivity without increasing waste.
2Productivity
If high-speed folding is implemented, then productivity increases, but the complexity of the folding apparatus increases
Solution Approach 1:
The vacuum drum and folding finger are merged into a coordinated system where the vacuum drum picks up the item and the folding finger performs the folding action in a single integrated motion sequence. This merging reduces the need for separate complex mechanisms while achieving high-speed folding.
Solution Approach 2:
The vacuum drum serves multiple functions: picking up the discrete item, holding it during transfer, and positioning it for folding. The folding finger similarly performs both the folding action and the deposition. This multi-functionality reduces the number of separate components needed, managing complexity while maintaining high productivity.
3Manufacturing precision
If precise folding control is used, then product quality improves, but the manufacturing complexity increases
Solution Approach 1:
The vacuum drum and folding finger are positioned and timed to work in equipotential coordination, where the transfer of the discrete item from drum to finger occurs at optimal points in their rotational cycles. This natural synchronization achieves precise folding control without requiring complex active control systems.
Solution Approach 2:
The folding apparatus uses the inherent motion and positioning of the vacuum drum and folding finger to achieve precise folding. The system self-regulates through the coordinated rotation and interaction of its components, eliminating the need for complex external control mechanisms while maintaining high manufacturing precision.
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 enables high-speed folding of discrete items with reduced waste and improved product quality, making it applicable beyond diaper manufacturing to other web-based operations, enhancing packaging efficiency and product integrity.
Implementation Method 1
a pair of vacuum drums rotating in the machine direction and first carrying a top side of a leading edge of the discrete item away from the conveyor
Data Source
AI summary
Apparatus and methods are provided for folding discrete items such as diapers at high speeds. Discrete items are conveyed in a machine direction toward a pair of engaging members rotating in the machine direction and first carrying a top side of a leading edge of the discrete item with a first engaging member away from the conveyor, and then carrying a bottom side of the leading edge with a second engaging member back towards the conveyor. The diaper fold is created at a contact point with a folding finger which travels rotationally and straight in a fixed orientation about a travel path into and out of contact with the diaper.