Corn Milling Process Using Counter-Rotating Rollers
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Solution Overview
Problem
Conventional corn milling processes result in undesirable degradation of the germ stream and incomplete separation of germ and endosperm, leading to reduced oil yield and purity of endosperm products.
Innovation Solution
A corn milling process that fractures corn kernels into large particles and uses counter-rotating rollers with fine corrugations and a speed differential of 1.1-1.4:1 to separate endosperm and germ without reducing the germ size, optimizing the gap between rollers for effective separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional differential roller mills with multiple grinding steps are used, then endosperm particles are ground to desired size, but germ stream undergoes undesirable degradation and germ size is reduced
Solution Approach 1:
The invention separates the milling process into two distinct streams: break rollers for endosperm-rich particles and germ rollers for germ-rich particles. This segmentation allows each stream to be processed with appropriate roller configurations, preventing germ degradation while achieving endosperm size reduction.
Solution Approach 2:
Different roller configurations are applied to different streams based on their composition. Break rollers with specific corrugation patterns are used for endosperm, while germ rollers with different characteristics are used for germ-rich streams. This local quality approach optimizes grinding for each material type without harming the germ.
2Manufacturing precision
If multiple successive roller mills are used to gradually reduce particle size, then separation is improved, but the process complexity increases and germ degradation worsens
Solution Approach 1:
The invention divides the corn stream into two separate processing paths early in the process: one for endosperm and one for germ. This segmentation eliminates the need for multiple successive roller mills that would otherwise be required to achieve the same separation, reducing process complexity while maintaining or improving purity.
Solution Approach 2:
The degerminator performs preliminary separation of germ and endosperm before the roller milling stage. This preliminary action allows subsequent roller mills to focus on size reduction rather than separation, reducing the number of grinding steps needed and simplifying the overall process.
3Quantity of substance
If conventional degerminators are used, then germ separation is attempted, but not all recoverable germ is separated from endosperm stream
Solution Approach 1:
The degerminator performs preliminary separation to remove the majority of germ from endosperm before roller milling. This preliminary action recovers most recoverable germ in a first pass, and the separate germ stream processing ensures complete germ recovery without contaminating the endosperm stream.
Solution Approach 2:
The invention uses different roller speed differentials for break and germ rollers to optimize separation. By adjusting operational parameters such as roll speed differential and corrugation patterns, the process achieves more complete germ separation while maintaining endosperm quality.
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 process increases oil yield by approximately 6% and produces a more concentrated and pure endosperm stream with higher starch content, reducing the number of grinding steps and preserving germ quality.
Implementation Method 1
The rollers rotate at different speeds thereby allowing the corrugations to grind the endosperm portion of the particles
Implementation Method 2
the corrugations to grind the endosperm portion of the particles
Data Source
AI summary
A corn milling process comprising fracturing corn kernels into relatively large particles, and passing the fractured particles between a pair of counter-rotating rollers, each of which presents fine corrugations of the type that normally characterizes the end of a differential corn milling process. The ratio of the roll speeds between the differential rollers is between approximately 1.1-1.4:1. The rollers are spaced apart a distance to grind the endosperm portion of the corn kernel particles while avoiding substantial penetration of the roller corrugations into the germ portion of the particles thereby separating the germ and endosperm portions without reducing the size of the germ.