Thermal Desorption Device for PET Preform Hydrocarbon Analysis
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Solution Overview
Problem
Current methods for analyzing hydrocarbons in terephthalate polyethylene (PET) preforms are imprecise, costly, and require complex preliminary treatments, resulting in significant variability in measurement results across different laboratories.
Innovation Solution
A thermal desorption device with a magazine system that allows for automatic processing and analysis of multiple objects without preliminary treatments, featuring adjustable dimensions, a shuttle mechanism for object handling, and a programmable thermal desorber for precise temperature control, enabling direct analysis of hydrocarbons from PET preforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If preliminary treatment (freezing, grinding, sifting) is performed on PET preforms, then the hydrocarbons can be freed from granule surfaces for analysis, but the analysis method becomes complicated, costly, and imprecise with error margin above 30%
Solution Approach 1:
The invention extracts the essential function of hydrocarbon release from the complex preliminary treatment process. By directly introducing the intact preform into the thermal desorption device, the method extracts only the necessary thermal desorption step while eliminating freezing, grinding, and sifting operations, thereby simplifying the procedure and reducing errors.
Solution Approach 2:
The invention performs preliminary action by directly placing the preform into the thermal desorption device in its original state, bypassing all intermediate treatment steps. This preliminary positioning of the sample in the correct device eliminates the need for subsequent manual handling and processing steps that introduce variability.
2Productivity
If multiple objects are processed manually with preliminary treatments, then hydrocarbon analysis can be performed, but the process is time-consuming and costly
Solution Approach 1:
The invention segments the analysis process by placing multiple preforms simultaneously into separate compartments or positions within the thermal desorption device. This allows parallel processing of multiple samples without requiring sequential manual treatment of each preform, thereby increasing throughput while reducing total analysis time.
Solution Approach 2:
The thermal desorption device is designed to automatically handle multiple preforms without requiring manual intervention for each sample. The device performs self-service by automatically heating, desorbing, and analyzing hydrocarbons from multiple preforms simultaneously, eliminating the need for repeated manual freezing, grinding, and sifting operations.
3Reliability
If different laboratories follow the same standard method, then hydrocarbon analysis should be consistent, but results vary by more than 30% across laboratories
Solution Approach 1:
The invention changes the critical parameters of the analysis method by eliminating variables related to manual preprocessing. By standardizing the direct introduction of intact preforms into the thermal desorption device, the method removes human-operated parameters (freezing temperature, grinding intensity, sifting mesh size) that cause variability between laboratories, thereby improving inter-laboratory consistency.
Solution Approach 2:
The invention replaces the mechanical preprocessing system (freezing, grinding, sifting equipment and operations) with a thermal desorption system. This substitution eliminates the mechanical variability introduced by different laboratories' equipment and operators, replacing it with a standardized thermal process that produces consistent results across different locations.
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 device significantly reduces analysis time and cost, enhances precision by minimizing sample handling, and achieves consistent results with an error margin of about 3% for hydrocarbon concentrations across the same production batch.
Implementation Method 1
activating the thermal desorber (12) to heat the object (P) and liberate substances adsorbed on the object
Data Source
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AI summary
A thermal desorption device and method are disclosed in which: a container receives one or more objects that are ejected by the container and housed on a movable receiving shuttle that conveys the objects inside a thermal desorber; the container ejects an object, through magnets, on the shuttle that, through an electric or pneumatic actuator, conveys the object inside the cell of the thermal desorber; a cap, through an electric or pneumatic rotating means, closes and seals the object inside the cell; at the end of the thermal desorption time, the cap opens, through an electric or pneumatic rotating means, and the movable shuttle extracts the object from the cell and, with a rotating means, rotates the shuttle and unloads the desorbed object into a collecting tank; after the desorbed object is unloaded into the collecting tank, the movable shuttle returns to the initial position to receive a new object to be conveyed inside the thermal desorber.