Oat Gluten Reduction via Optical Sorting and Mechanical Cleaning
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Solution Overview
Problem
Oat-based products often contain unintentional gluten due to the similarity in size and appearance with gluten-containing grains, making it difficult to remove unwanted grains during processing, which renders them not technically 'gluten-free' according to industry standards.
Innovation Solution
A method and system involving multiple mechanical and optical sorting steps to remove non-oat constituents from oat kernels, including initial aspiration and screening, mechanical cleaning with indented cylinders, optical sorting using bichromatic cameras, and subsequent dehulling, mechanical screening, and kilning to produce an oat stream with significantly reduced gluten content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple mechanical and optical sorting steps are implemented to remove non-oat constituents, then gluten content is reduced to below 20 ppm, but processing complexity and time increase
Solution Approach 1:
The processing system is divided into multiple sequential stages: initial aspiration and screening, first mechanical cleaning with indented cylinders, optical sorting with cameras, dehulling, second mechanical cleaning, and final optical sorting. Each stage targets specific types of contaminants and progressively reduces gluten content to below 20 ppm, with each segment contributing to the overall purification goal.
Solution Approach 2:
Optical sorting cameras act as intermediary detection devices between mechanical cleaning stages, identifying non-oat constituents that mechanical means cannot separate. The camera system provides intermediate detection and classification, enabling precise removal of gluten-containing grains while preserving oat quality.
2Manufacturing precision
If multiple mechanical and optical sorting steps are implemented to remove non-oat constituents, then gluten content is reduced to below 20 ppm, but processing time increases
Solution Approach 1:
Initial aspiration and screening are performed on harvested oats before they enter the main processing line, removing obviously large impurities such as corn and soybeans early. This preliminary action reduces the burden on subsequent sorting stages and accelerates the overall process by eliminating obvious contaminants before detailed optical and mechanical sorting begins.
Solution Approach 2:
The processing system operates continuously with multiple parallel cleaning and sorting stages working simultaneously on different portions of the oat stream. Mechanical cleaners and optical sorters function in continuous sequence without interruption, maintaining steady-state operation that minimizes processing time while achieving the required gluten reduction to below 20 ppm.
3Measurement precision
If optical sorting with bichromatic cameras is used to identify and remove non-oat grains, then sorting precision is improved, but equipment cost and complexity increase
Solution Approach 1:
The patent replaces purely mechanical sorting methods with optical detection systems using bichromatic cameras that capture images in two different wavelengths. This substitution enables precise identification of non-oat constituents based on their optical properties rather than mechanical characteristics, achieving superior sorting precision for gluten-containing grain removal.
Solution Approach 2:
The optical sorting system utilizes changes in optical parameters (light absorption and reflection characteristics at different wavelengths) to distinguish between oat grains and gluten-containing contaminants. By measuring and comparing optical parameters across two color channels, the system achieves high-precision identification and selective removal of non-oat grains.
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 effectively reduces gluten content in oat products to levels below 20 parts per million, allowing manufacturers to label their products as 'gluten-free', providing safer options for gluten-sensitive consumers.
Implementation Method 1
density separating the oat kernel stream by passing the oat kernel stream over at least one oscillating gravity separation table
Implementation Method 2
the optical sorter comprises at least one bichromatic camera that operates in the visible light spectrum, and at least one bichromatic camera that operates in the infrared spectrum
Data Source
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AI summary
A method and system is disclosed which uses a combination of optical and mechanical separation processes to remove gluten-containing grains from a mixture of oat kernels.