Continuous In-Line Pleating Apparatus for Glass Microfiber Media
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Solution Overview
Problem
Existing pleating technologies face challenges in efficiently forming small pleats in glass micro fiber media, which is elastic and delicate, leading to unreliable pleat formation and potential damage due to excessive strain, especially when trying to achieve pleat heights less than 0.25 inches.
Innovation Solution
A web pleating apparatus with interleaved converging protuberances in the machine direction and Z-direction, which scores and folds the web to create machine direction pleats, controlling the folding process to prevent strain and ensure reliable pleat formation, even in elastic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional pusher bar or rotary score pleaters are used to create pleats in glass micro fiber media, then pleats can be formed in the cross-machine direction, but the process is slow and requires multiple machines to achieve high throughput
Solution Approach 1:
The patent transitions from conventional cross-machine direction (CD) pleating to machine direction (MD) pleating, fundamentally changing the dimension in which pleats are formed. This allows a single continuous pleating machine to achieve high throughput by pleating in the direction of web travel, eliminating the need for multiple machines or CD lanes that were required with conventional CD pleating methods
2Manufacturing precision
If MD pleating methods using chains and V-shaped guides are used, then pleats can be formed in the machine direction, but the method is not well suited for small pleat heights due to the large chain cross-section required
Solution Approach 1:
The patent replaces the single large-chain system with multiple smaller, segmented pleating elements arranged in a matrix pattern. These individual pleating elements work cooperatively to form small pleats with precise height control, eliminating the need for large chain cross-sections that prevented small pleat formation
Solution Approach 2:
The patent employs a matrix array of distributed pleating elements rather than a single large-chain system. Each local pleating element can be independently sized and positioned to create precise small pleats, providing local control over pleat formation that enables accurate height control for small pleats
3Reliability
If chains are used to drive the web through guides, then MD pleats can be formed, but the weight of the chains must hold the web into the guides and elastic webs can lift the chains out, preventing folding
Solution Approach 1:
The patent inverts the conventional approach by using a matrix array of smaller pleating elements that actively engage and guide the web, rather than relying on heavy chains to passively hold the web down. The pleating elements are positioned to actively control web folding, preventing elastic webs from lifting them out of position
4Manufacturing precision
If male rings press the web into female grooves during scoring, then longitudinal corrugations can be formed, but this method produces excessive strain on the web and can lead to catastrophic failure
Solution Approach 1:
The patent employs a matrix array of distributed pleating elements that gradually and evenly distribute folding forces throughout the web, rather than concentrating strain at discrete scoring points. This cushioning effect prevents excessive localized strain that would compromise web integrity while still achieving precise corrugation formation
5Strength
If soft rollers are used to minimize strain during corrugation formation, then web strain is reduced, but the rollers cannot fully press longitudinal corrugations into grooves unless they are very shallow
Solution Approach 1:
The patent uses a dynamic matrix array of pleating elements that can adapt to web thickness and material properties, allowing full-depth corrugation formation without excessive strain. The distributed elements provide progressive folding action that maintains web integrity while achieving the required corrugation depth
6Manufacturing precision
If belts are used to fold pleats between converging belts, then MD pleats can be formed, but this requires impractically small belts for small pleats and the belts cannot resist the Z-direction spring force of compressed pleated web
Solution Approach 1:
The patent replaces single large converging belts with a segmented matrix array of smaller pleating elements. These distributed elements can resist Z-direction spring forces more effectively by distributing the load across multiple contact points, while also enabling small pleat formation without requiring impractically small belt dimensions
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
Enables high-speed pleat formation in the machine direction with precise control, suitable for both elastic and non-elastic materials, reducing the risk of damage and ensuring consistent pleat quality, including small pleat heights.
Implementation Method 1
Glass micro fiber media material tends to have memory and is highly elastic in bending and resists plastic deformation. Material that bends elastically will generally not take a set when folded and can spring back to its original shape if not controlled properly.
Data Source
AI summary
A web pleating apparatus comprising a first series of converging elongate spaced protuberances and a second series of elongate spaced protuberances converging in the machine direction. The first series of protuberances and said second series of protuberances interleave in the Z-direction. The interleaved protuberances are capable of folding a pleatable web into a generally pleated pattern of machine direction pleats upon contact with said first and second series of protuberances.