Vacuum Conduit Sampling for Plastic Container Contaminant Detection
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Solution Overview
Problem
Current mass spectrometer systems for detecting contaminants in plastic bottles are unreliable and prone to false rejects in industrial environments with high NOx and hydrocarbon concentrations, leading to inefficiencies in high-volume production applications.
Innovation Solution
A vapor analysis system that uses a mass spectrometer with a conduit and vacuum pump to maintain a pressure differential, allowing for sequential air sampling from moving plastic containers, and includes a heating element to prevent contamination, enabling sensitive detection without being overwhelmed by industrial conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mass spectrometer is used for contaminant detection, then detection sensitivity is improved, but reliability deteriorates in industrial environments with high NOx and hydrocarbon concentrations
Solution Approach 1:
The system divides the sampling process into distinct phases: a first sample is taken during normal operation to establish a baseline, and a second sample is taken after introducing a challenge gas. This segmentation allows the system to distinguish between normal industrial contaminants and actual bottle contaminants, resolving the reliability issue while maintaining high detection sensitivity.
Solution Approach 2:
The system changes operational parameters by introducing a challenge gas (such as nitrogen or carbon dioxide) at a specific concentration to temporarily alter the atmospheric conditions around the bottle. This parameter change creates a detectable signal that distinguishes real contaminants from background noise, allowing the mass spectrometer to maintain high sensitivity without false positives from industrial NOx and hydrocarbons.
2Productivity
If mass spectrometer operates continuously at high speed, then productivity is improved, but detection accuracy deteriorates due to false rejects
Solution Approach 1:
The system implements periodic challenge gas introduction at predetermined intervals during the inspection process. This periodic action creates regular, predictable detection events that allow the mass spectrometer to maintain high inspection speed while using the challenge gas pulses as reference points to校准 detection accuracy and reduce false rejects.
Solution Approach 2:
The system uses the baseline sample and challenge gas response as feedback mechanisms to continuously monitor and adjust detection thresholds. This feedback loop allows the system to maintain high productivity by quickly identifying true positives while filtering out false rejects caused by industrial environmental contaminants.
3Reliability
If conventional detectors are used, then reliability is improved in industrial environments, but detection sensitivity deteriorates
Solution Approach 1:
The challenge gas acts as an intermediary substance that mediates between the mass spectrometer and the bottle contaminants. By introducing this known substance, the system creates a controlled interaction that enhances detection sensitivity while the comparative analysis with baseline samples maintains reliability in industrial environments with high NOx and hydrocarbon concentrations.
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
The system achieves reliable and sensitive detection of contaminants at high production rates, reducing false rejects and maintaining operational efficiency in high-volume production environments.
Implementation Method 1
a vacuum pump interconnected to the second end of the conduit and configured to maintain the interior of the conduit at a second vacuum level lower than the first vacuum level and configured to establish a rate of airflow sufficient to sequentially withdraw the samples of air from the plurality of plastic containers and transport the samples in the conduit to the sensor module of the detector
Implementation Method 2
a detector for sequentially receiving a sample of air from each of the plurality of plastic containers as they move along the test line and for detecting the chemical content of each of said samples, wherein the detector is maintained at a first vacuum level
Implementation Method 3
includes a heating element to prevent contamination
Data Source
AI summary
A system for testing the chemical content of a plurality of plastic containers continuously moving along a test line. The system includes a detector maintained at a first vacuum level for sequentially receiving a sample of air from each of the plurality of plastic containers as they move along the test line and for detecting the chemical content of each of the samples. There is a conduit including a first end proximate the plurality of plastic containers and a second, remote end. There is a sensor module interfacing the conduit between its first end and the second ends. There is also a vacuum pump interconnected to the second end of the conduit to maintain the interior of the conduit at a second, lower vacuum level and to establish an airflow rate to sequentially withdraw and transport air samples from the plastic containers to the sensor module.