Optical Wall Thickness Inspection for Plastic Containers
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Solution Overview
Problem
Existing methods for inspecting the wall thickness of plastic containers in the production process are inefficient, involving destructive tests that incur material and personnel costs, and are prone to errors due to manual handling and documentation.
Innovation Solution
An automated test procedure using a dedicated test container program that checks the wall thickness of test containers with predetermined values, allowing for regular inspections and reducing manual intervention, with the inspection unit determining wall thickness in multiple areas and comparing it to known values to ensure accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If destructive testing is used to inspect wall thickness, then measurement accuracy is improved, but material cost and personnel cost increase
Solution Approach 1:
The patent uses optical copying principles where light is transmitted through the container wall and the absorption characteristics are measured. This creates an optical model of the wall thickness without physical contact or destruction, replacing the need for destructive sampling while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces mechanical destructive cutting and physical measurement with an optical measurement system. The inspection unit uses light transmission and absorption measurements to determine wall thickness, substituting mechanical destruction with non-contact optical detection.
2Measurement precision
If manual cutting and measuring is performed, then measurement detail is improved, but error rate increases
Solution Approach 1:
The system performs self-verification by measuring known reference containers and automatically comparing results against predetermined values. The inspection unit self-calibrates and validates its measurements without human intervention, reducing documentation errors and improving reliability.
Solution Approach 2:
The patent implements automated feedback loops where measurement results are immediately compared against reference values, and deviations are automatically flagged. This continuous feedback mechanism eliminates manual documentation errors and ensures consistent measurement quality.
3Productivity
If automated inspection is implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The inspection unit serves multiple functions: it measures wall thickness of production containers, verifies reference containers with known values, performs self-calibration, and generates automated reports. This multi-functionality consolidates what would otherwise require multiple separate systems into a single integrated device.
Solution Approach 2:
The patent combines the reference container verification function, calibration function, and production inspection function into a single integrated inspection unit. The control unit merges data processing, comparison logic, and reporting functions, reducing overall system complexity while maintaining automation benefits.
4Reliability
If reference containers with known wall thickness are used, then measurement validation is improved, but time expenditure increases
Solution Approach 1:
Reference containers with predetermined wall thickness values are prepared in advance with known characteristics. This preliminary preparation allows the inspection system to perform rapid validation measurements without time-consuming manual setup or calculation during the actual inspection process.
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
This approach significantly reduces errors and costs by automating the inspection process, ensuring high product quality through accurate and efficient measurement logging and documentation, and enabling continuous monitoring of the inspection unit's performance.
Implementation Method 1
it would also be possible to determine the wall thickness indirectly, for example by means of another measured value such as a transparency of the wall
Data Source
AI summary
A method for inspecting a device for forming plastic preforms into plastic containers, the device having a transport unit, at which a plurality of forming stations for forming plastic preforms into plastic containers is arranged, and an inspection unit that is arranged after the forming stations in a transport direction of the plastic containers and that determines a wall thickness of these plastic containers in at least one region of the plastic containers produced, includes the following steps:introducing at least one test container that has a predetermined and/or known wall thickness a least in sections, anddetermining a first wall thickness in at least one area of the container by the inspection unit.