Resilient Roller Measurement for Film Web Thickening Detection
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Solution Overview
Problem
Existing methods struggle to quickly and simply detect local thickenings in film webs, such as pimple-shaped defects, which can arise during extrusion and co-extrusion due to material accumulation or contaminant inclusions.
Innovation Solution
A measurement device with a first roll and a second roll that can be moved along the film web, where the second roll is resiliently guided in the thickness direction, and a non-displaceable distance sensor measures the distance change between the rolls to detect local thickenings, allowing for quick and simple detection without needing to know the exact position, shape, or size of the thickening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional measurement methods are used to detect local thickenings in film webs, then detection accuracy may be maintained, but detection speed and simplicity are insufficient
Solution Approach 1:
The patent replaces complex optical or electronic measurement systems with a simple mechanical measurement system. A resiliently mounted roller contacts the film web surface, and local thickenings cause the roller to displace vertically. This mechanical displacement is directly measured by a distance sensor, eliminating the need for complex imaging or scanning systems while achieving both high detection speed and simplicity.
Solution Approach 2:
The measurement system uses the film web itself as the measurement surface. The resilient roller naturally follows the film web contour, and local thickenings automatically cause roller displacement that is directly detectable. The system requires no external power source for the film web and uses the film's own physical properties for detection, achieving rapid and simple detection.
2Measurement precision
If detailed information about thickening position, shape, and size is required, then measurement precision improves, but detection complexity and time increase
Solution Approach 1:
The patent extracts only the essential measurement information needed for quality control - the vertical displacement of the resilient roller caused by local thickenings. By focusing solely on this single parameter rather than attempting to map the complete three-dimensional shape and position of thickenings, the system achieves adequate measurement precision with minimal complexity. The distance sensor measures only the roller's vertical position, ignoring other geometric details.
3Reliability
If the second roll is rigidly fixed, then structural stability is maintained, but the ability to detect local thickenings is lost
Solution Approach 1:
The patent introduces controlled dynamics into the measurement system by resiliently mounting the second roller. The roller is supported by a resilient element (such as a spring or elastomer) that allows it to dynamically respond to surface variations in the film web. This dynamic capability enables the roller to follow local thickenings and produce detectable displacement signals, while the resilient mounting provides sufficient stability for reliable measurement.
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 rapid identification of defective film web sections by detecting distance changes exceeding a threshold, facilitating easy removal or marking of defective areas, thereby improving production efficiency and quality control.
Implementation Method 1
a second roll that can be moved along the film web, wherein the second roll is resiliently guided in the thickness direction of the film web that can be moved along
Data Source
AI summary
Provided is a measurement device (10) for detecting local thickenings in a film web (20), more particularly an extrusion and/or coextrusion film, having a first roll (14) for rolling on the film web (20) that can be moved along, a second roll (18) that can be supported indirectly above the film web (20) on the first roll (14) for rolling on the film web (20) that can be moved along, wherein the second roll (18) is resiliently guided in the thickness direction of the film web (20) that can be moved along, more particularly in the vertical direction, and at least one distance sensor (24) that is stationary with respect to the first roll (14) and/or to the film web (20) that can be moved along, for detecting a distance of the second roll (18). The second roll (18), which can be displaced from a local thickening of the film web (20) in the thickness direction of the film web (20), makes it possible to quickly and easily detect local thickenings in a film web (20).