Integrated Plastic Preform and Container Inspection for Stable Production
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Solution Overview
Problem
Current manufacturing processes for plastic containers, particularly PET containers, require separate inspection devices for preforms and containers, leading to complexity due to similar measurement principles and increased operational complexity.
Innovation Solution
A unified inspection device that combines inspection of both plastic preforms and containers, allowing them to pass through overlapping inspection areas, with a single processing device to evaluate and correlate measurement results, and a forming device that adapts based on these results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate inspection devices are used for plastic preforms and containers, then inspection coverage is complete, but device complexity increases
Solution Approach 1:
The patent combines two separate inspection devices into a single unified inspection device that inspects both plastic preforms and finished containers. The device includes a first inspection unit for preforms and a second inspection unit for containers, both integrated into one system with shared infrastructure, thereby reducing overall device complexity while maintaining complete inspection coverage.
Solution Approach 2:
The unified inspection device performs multiple inspection functions using a single system. It inspects plastic preforms for properties such as wall thickness and material composition, and subsequently inspects the formed containers for similar properties. This multi-functional approach eliminates the need for separate dedicated inspection devices for each stage.
2Measurement precision
If separate inspection devices are used for plastic preforms and containers, then inspection specialization is maintained, but operational complexity increases
Solution Approach 1:
The patent integrates multiple inspection functions into a single operational system. The unified inspection device uses one control unit to manage both preform inspection and container inspection operations, simplifying the operational interface and reducing the complexity of managing multiple separate devices while maintaining specialized measurement capabilities.
Solution Approach 2:
The inspection device incorporates feedback mechanisms where measurement results from preform inspection can inform subsequent container inspection parameters. The control unit processes data from both inspection stages and provides feedback for optimizing inspection parameters, reducing operational complexity through automated parameter adjustment.
3Device complexity
If overlapping inspection areas are used for preforms and containers, then device structure is simplified, but measurement correlation becomes challenging
Solution Approach 1:
The control unit establishes feedback loops that correlate measurements taken at different inspection stages. Data from preform inspection (first inspection unit) is used to predict or validate container inspection results (second inspection unit), ensuring measurement correlation despite the overlapping inspection areas and different object states.
Solution Approach 2:
The control unit acts as an intermediary that processes and correlates data from both inspection units. It reconciles measurements taken on preforms versus finished containers by applying transformation algorithms that account for the forming process changes, ensuring accurate correlation between the two measurement sets.
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
Simplifies the inspection process by reducing the need for separate devices, enhances accuracy through correlated measurements, and improves production stability by minimizing deviations in container properties.
Implementation Method 1
Each measuring point uses infrared sensors to record the absorption of the containers and, preferably, also of a reference emitter at several (preferably two) wavelengths
Implementation Method 2
the wavelengths considered, the reference emitters, and the optical components may differ in their properties
Data Source
Figure 1~2
Figure 3~5
AI summary
The invention relates to an apparatus (1) for producing plastic containers, said apparatus comprising: a transport device (2) which transports plastic preforms (10) along a predefined transport path (P1, P2, P3); a forming device (4) which expands the plastic preforms to form plastic containers (20); a first inspection device (6) which is suited and designed to inspect the plastic preforms (10); and a second inspection device (8) which is suited and designed to inspect the plastic containers (20), characterised in that the first inspection device has a first inspection region (B1) through which the plastic preforms (10) to be inspected pass so that they can be inspected, and the second inspection device (8) has a second inspection region (B2) through which the plastic containers (20) to be inspected pass so that they can be inspected, said first inspection region and said second inspection region (B2) overlapping at least in part.