Stretching Caliper Unit with Localized Friction Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stretching systems face challenges in accurately detecting and localizing changes in friction between guide rails and clamp units, which are influenced by factors like unevenness, deformation, and process parameters, leading to wear and inefficiencies.
Innovation Solution
A caliper unit equipped with a sensor device that records measurement data during operation, allowing for localized detection of friction changes and process parameters such as temperature and tensile force, integrated with a clamping device and guide elements to clamp and guide the material web, and capable of wireless data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power monitoring is used to detect friction changes, then changes can be detected, but localization of the changes is not possible
Solution Approach 1:
The patent divides the continuous guide rail into discrete measurement zones by placing multiple sensor devices at different positions along the guide rail. Each sensor independently measures friction in its local zone, transforming a global power measurement into segmented local measurements that can be individually analyzed and localized.
2Force
If clamp units are subjected to high loads for stretching, then stretching function is achieved, but wear increases
Solution Approach 1:
The patent implements preventive maintenance by continuously monitoring friction forces before they reach critical levels. The sensor devices detect early signs of wear or contamination in the guide rail-clamp unit interface, allowing operators to intervene before actual wear occurs, thus preserving the reliability of components subjected to high stretching forces.
3Temperature
If guide rails are placed in oven for heating, then material web can be tempered, but friction fluctuations occur due to thermal effects
Solution Approach 1:
The patent employs feedback control by continuously measuring friction forces with sensor devices positioned along the guide rail in the oven zone. These measurements provide real-time information about thermal-induced friction variations, enabling operators to adjust process parameters or maintenance schedules to compensate for temperature-related friction instability.
Data Source
Figure 1~2
Figure 3
Figure 4A
AI summary
The present invention relates to a caliper unit 100 and a stretching system, in particular a transverse, longitudinal, and/or simultaneous stretching system 10. The caliper unit comprises a base body 110, at least one guide element, and at least one clamping device 130. The clamping device 130 is arranged on the base body 110 and configured to clamp a material web 12. The guide element is arranged on the base body 110 and configured to guide the caliper unit 100 on a guide rail. Furthermore, the caliper unit 100 comprises a sensor device 300 configured to record measurement data during operation of the caliper unit 100 in a stretching system 10.