Cross-lapper Roller Stabilizing Fiber Web Reversal
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Solution Overview
Problem
Conventional crosslappers face issues with web fibers coming off the belt during reversal, leading to non-uniformity and mechanical weakness, which is exacerbated by the need for costly suction means and perforated cylinders to maintain web integrity at higher speeds.
Innovation Solution
A rotating element, such as a roller, is positioned above the reversal zone to create a Magnus effect overpressure, preventing web fibers from being dislodged by centrifugal forces and air flow, ensuring uniform web formation without the need for suction means or perforated cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the spreader operates at higher speeds to increase productivity, then production efficiency is improved, but web fibers detach from the conveyor belt during reversal causing non-uniformity
Solution Approach 1:
A rotating element is positioned above the turning zone to generate a counter-pressure field that opposes the centrifugal forces and airflow induced during web reversal. This preliminary counter-action prevents fiber detachment before it occurs, maintaining web uniformity even at high operating speeds
Solution Approach 2:
The rotating element's speed is controlled to dynamically adjust the counter-pressure magnitude based on operating conditions. By varying rotational speed, the system adapts the stabilizing force to match different production speeds and web types, optimizing both productivity and web quality
2Reliability
If suction devices with perforated conveyor belts are used to prevent fiber detachment, then web integrity is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts and eliminates the complex suction system with perforated belts, replacing it with a simpler rotating element that generates stabilizing pressure through rotation alone, thereby maintaining web integrity while reducing device complexity
Solution Approach 2:
The complex mechanical suction system is replaced by a simpler rotating element that uses aerodynamic pressure generation through rotation. This substitution maintains the essential function of preventing fiber detachment while significantly simplifying the mechanical structure
3Productivity
If the spreader operates at higher speeds, then productivity is improved, but the web structure becomes less stable during reversal
Solution Approach 1:
The rotating element's rotational speed is dynamically adjusted to match operating conditions. At higher production speeds, the rotation rate increases to generate sufficient counter-pressure, maintaining web stability across a wide range of productivity levels
Solution Approach 2:
The rotating element creates a stabilizing pressure field in advance during the reversal process, countering the destabilizing effects of high-speed operation before they can compromise web structure
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 solution maintains web integrity and uniformity at higher production speeds, reducing operational complexity and costs by stabilizing the web through controlled air flow and mechanical support, resulting in a higher quality final product.
Implementation Method 1
By providing a rotating element, in particular a rotating roller, above or substantially above the turning area or region to create a kind of local overpressure by Magnus effect
Data Source
Figure 1~2
AI summary
A crosslapper intended to supply a layer of fibres as output on the basis of a web (1) of fibres supplied as input, the crosslapper superimposing sections of the web in order to form the output layer and comprising a front belt (2), a rear belt (4) and return means (3) intended to return the web of fibres so that it can be transitioned from a state in which it is supported by the front belt to a state in which it is supported by the rear belt, characterised in that a rotationally driven element, for example, a rotationally driven roller (20) or cylinder, is disposed substantially above the region of the web in which the return is performed.