Foreign Body Detection in Spinning Using Polarized Light
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Solution Overview
Problem
Existing foreign fiber or foreign part separators in spinning preparation machines struggle to reliably detect light-colored, colorless, or transparent plastics like polypropylene tapes and foils due to limitations in existing optical detection methods, which often result in insufficient recognition or interference issues.
Innovation Solution
The use of polarized light in combination with a detector that identifies foreign parts based on reflected light, color information, and surface gloss, along with parallel detection devices and a matrix or line camera, ensures reliable detection of foreign parts by distinguishing between fiber material and foreign substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarized transmitted light and UV light are used for detection, then detection capability for transparent and fluorescent foreign parts is improved, but device complexity increases due to multiple illumination sources and inspection points
Solution Approach 1:
The patent combines multiple detection methods (polarized transmitted light detection and UV reflected light detection) into a single integrated device. The housing contains both inspection points, and the control unit processes signals from both detection methods to identify foreign parts, thereby improving detection reliability without proportionally increasing device complexity.
Solution Approach 2:
The device is designed to perform multiple detection functions simultaneously - detecting transparent foreign parts via polarized transmitted light and fluorescent foreign parts via UV light. This multi-functional approach allows a single device to handle various types of foreign parts that would otherwise require separate detection systems.
2Reliability
If multiple inspection points are added to detect different types of foreign parts, then detection reliability is improved, but the machine size increases and distances between detection and ejection points become too large
Solution Approach 1:
The patent places multiple inspection points within a single housing structure. The first inspection point (for polarized transmitted light) and the second inspection point (for UV reflected light) are nested within the same device housing, allowing compact arrangement of multiple functional components without significantly increasing overall machine footprint.
3Measurement precision
If classic color detection or polarized transmitted light method is used, then detection of colored foreign parts is improved, but light-colored, colorless, or transparent plastics cannot be reliably recognized
Solution Approach 1:
The patent introduces polarized light as an intermediary detection method. By using polarized transmitted light, the system can detect foreign parts based on their optical properties (birefringence) rather than color alone. This intermediary approach enables detection of transparent and colorless plastics that are invisible to classic color detection methods.
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 solution enables effective detection and separation of bright, colorless, or transparent plastics by utilizing polarized light and UV light, maximizing detection reliability and minimizing interference, thus improving the overall efficiency of foreign part recognition and removal in spinning preparation machines.
Implementation Method 1
The light source (15) is designed to emit polarized light
Implementation Method 2
The detector device (6) is able to record the polarization state of the light
Implementation Method 3
UV light (31) in combination with simultaneous irradiation with UV light
Data Source
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AI summary
In order to improve a device in spinning preparation for identifying foreign bodies made of plastics material, such as polypropylene tapes, fabrics and films or the like, in or among fibre flocks, for example made of cotton, a source using polarized light acts on the fibre material (fibre flocks) and on the foreign bodies and cooperates with a detector which uses the reflected light to allow simultaneous detection of the foreign bodies with the aid of the colour information and of the surface gloss.