Blow Extrusion Film Anomaly Detection Control
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Solution Overview
Problem
Existing blow-extrusion film systems face challenges in detecting and addressing anomalies and malfunctions in real-time, leading to irregularities in film production, potential tearing or collapse of the film tube, and prolonged downtime due to undetected variations in system parameters such as air supply and temperature.
Innovation Solution
Implementing a method that continuously measures multiple input parameters using sensors and calculates an output parameter, comparing it to a reference parameter to detect deviations, which triggers visual or acoustic signals and allows for system adjustments to prevent anomalies, such as switching off components or adjusting temperature and blower speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple measuring devices are installed to monitor system parameters, then detection precision is improved, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it controls the extruder, measures process parameters (temperature, pressure, flow rate), detects anomalies by comparing measured values to reference values, and activates warning signals. This multi-functional integration improves measurement and detection capabilities without proportionally increasing system complexity.
Solution Approach 2:
The patent combines multiple measuring devices (temperature sensor, pressure sensor, flow rate sensor) and their control functions into a single integrated control unit. This merging approach allows comprehensive parameter monitoring and anomaly detection while reducing the overall system complexity compared to having separate independent systems for each function.
2Reliability
If continuous monitoring of system parameters is implemented, then reliability is improved, but use of energy increases
Solution Approach 1:
The control unit continuously receives measured values from sensors, compares them against stored reference values, and automatically activates warning signals when anomalies are detected. This feedback mechanism ensures continuous monitoring for improved reliability while energy is consumed only when needed for measurement and anomaly detection, rather than constant high-power operation.
Solution Approach 2:
The control unit automatically performs anomaly detection by comparing measured parameters against reference values and autonomously activates warning signals without requiring continuous human intervention. This self-service approach maintains production reliability through continuous monitoring while minimizing energy consumption by operating only when monitoring and comparison are needed.
3Manufacturing precision
If reference values are stored and continuously compared, then manufacturing precision is improved, but loss of time occurs during data processing
Solution Approach 1:
Reference values for process parameters (temperature, pressure, flow rate) are pre-stored in the control unit during the setup phase. This preliminary action allows the control unit to immediately compare current measured values against known good reference values without requiring real-time data processing or analysis, thereby maintaining manufacturing precision while minimizing response time for anomaly detection.
Data Source
AI summary
A plastic film of a thermoplastic synthetic resin is made in a film-making system by extrusion from a die of an extruder. First the plastic is melted and extruded from the die as a tube or web that is, typically after cooling and stretching, formed into a package. At least one reference parameter is provided, and, during continuous operation of the system, two input parameters different from the reference parameter are measured by respective measuring devices An output is determined from these reference parameters and is compared with the reference parameter.