Nonwoven Web Guiding With Stabilizing Plates Against Fluttering
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Solution Overview
Problem
Nonwoven webs made of plastic fibers experience poor running behavior, including fluttering and tears, due to air flows caused by guide and treatment rollers, leading to inhomogeneous properties and reduced strength, which existing solutions like additional rollers or spoiler plates have failed to adequately address.
Innovation Solution
The method involves guiding the nonwoven web with stabilizing plates positioned close to the rollers to minimize air flow disturbances, using at least one stabilizing plate in the conveying direction in front of or behind the roller unit, and optionally a flat deflection element to divert air, ensuring the web is not exposed to gas or steam, thereby reducing fluttering and maintaining web integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher web tensions are used to control the fleece web, then the running behavior is improved, but the width of the nonwoven web decreases and the strength properties worsen
Solution Approach 1:
A stabilizing plate is introduced as an intermediary element between the air flow and the nonwoven web. The plate deflects the air flow caused by guide rollers and treatment rollers, preventing direct air flow contact with the web. This mediator approach allows the web to be guided without requiring excessive tension, thereby maintaining both running behavior and strength properties.
2Object-affected harmful factors
If additional rollers or spoiler plates are installed to divert air currents, then the air flow disturbances are reduced, but the device complexity and cost increase
Solution Approach 1:
The harmful air flow is extracted and redirected away from the nonwoven web by the stabilizing plate. Instead of adding multiple rollers or complex spoiler plate systems, the invention extracts the air flow path from the web area and redirects it through the space around the stabilizing plate, simplifying the overall device structure while effectively reducing air flow disturbances.
3Ease of operation
If the nonwoven web is guided over guide rollers and treatment rollers, then the web processing is enabled, but air flow is generated causing fluttering and inhomogeneous properties
Solution Approach 1:
The stabilizing plate serves as a mediator that allows guide rollers and treatment rollers to continue performing their web processing functions while simultaneously protecting the nonwoven web from the harmful air flows generated by these same components. The plate is positioned to deflect air flows before they can contact the web, maintaining both processing capability and web homogeneity.
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 approach significantly improves the running behavior of nonwoven webs by reducing air flow influences, eliminating fluttering, and maintaining web width and strength, achieved through simple and cost-effective measures.
Implementation Method 1
a stabilizing plate is provided in the conveying direction F before or directly before a roller unit (2, 3) for the nonwoven web (1) or behind or directly behind the roller unit (2, 3) in the conveying direction F of the nonwoven web (1)
Data Source
Figure 1~3
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AI summary
Method for guiding a non-woven web made of plastic fibers conveyed in the conveying direction F, wherein a non-woven web with a web thickness d less than 2 mm and with a basis weight less than 30 g/m2 is used. The fleece web is brought into physical contact with at least one guide and/or treatment roller or with at least one roller unit made up of at least two guide and/or treatment rollers. At least one stabilizing plate extending in the conveying direction F and transversely to the conveying direction F of the nonwoven web is provided in the conveying direction F in front of or directly in front of the roller or the roller unit and/or behind or immediately behind the roller or the roller unit. The fleece web is guided along the at least one stabilization plate with the proviso that the distance a between the surface of the stabilization plate facing the fleece web and the fleece web surface is 0 to 20 mm.