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Chapter 4 Notes

by: Nichole Knopp

Chapter 4 Notes GRSC150

Nichole Knopp
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About this Document

Understanding the machines that clean wheat kernels.
Principles of Milling
Churchill, Frances Maria
Class Notes




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This 2 page Class Notes was uploaded by Nichole Knopp on Monday February 8, 2016. The Class Notes belongs to GRSC150 at Kansas State University taught by Churchill, Frances Maria in Fall 2015. Since its upload, it has received 28 views. For similar materials see Principles of Milling in Science at Kansas State University.

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Date Created: 02/08/16
Wheat Cleaning Objectives:  State reasons for cleaning wheat before milling  2 goals for cleaning wheat   Describe principles of separating used in wheat cleaning  Know how each cleaning equipment works and which principle of separation it uses Reasons for cleaning wheat:  Protect people/employees o Dust control o Sanitation o Process equipment o Recover non­millable material  Protect Product o Produce food­safe product o “Quality” product 2 Goals for cleaning wheat:  Remove all non­wheat material o Insects, cans, sticks, straws  Remove non­millable material o Shrunken, broken, small, infested Principles of separating in wheat cleaning:  Magnetic Properties  Flow in Air o Intake, in­process, aspirator o Aspirator­Separates light product from grain  Size: Removes big material (Drum Sieve) o Receiving separator: pre­cleaner o Combicleaner­Separator (size), Aspirator removes dust, shriveled kernels, insect  infested kernels (air), concentration and de­stoner (Density)  Shape:  o Cylinder Separator/ Indent Separator: Grain passes through round metal cylinder  with small round indentions, that pick up contaminates the fit in the “pockets”.  Then kicked out by a brush or beater roller.   Separates small round seeds from wheat o Disk separator: Has “pockets” on individual disks  Con: Once pockets wear out, must tear entire machine apart o Precision Grader: Slotted screen, removes corn from wheat by width o Spiral Gravity Separator “Shape only”: Removes soybeans, 2 outlets: Round  shape Outside track and Oval shape on inside track  Friction/Abrasion o Scourer­Uses friction to clean the surface of wheat kernel, uses abrasion to  remove brush hairs, surface dirt, and loose bran layers o Peeler uses friction to remove outer bran layers  Friability (Internal Strength) o Infestation Destroyer: the goal have less than 10 insect fragments in 100g sample,  helps break fragmented kernels by hitting 2 rows of metal pins  Specific Gravity  o Gravity Table: Feed rate, end raise­one end is higher than the other, side tilt­ one  side is higher than the other, eccentric speed, and air control are all available  adjustments. Helps get rid of the “crumbs” of kernels o Stoner: Machine shakes up and down vigorously to separate materials based on  density  Color o Digital Optical Sorter: If looking at the color spectrum, compare to “grey scale”  the machine looks at saturation of kernels  Too dark, too white, grey just right  Camera determines good product and defect by blasting bad with air into  separate bin  5 total channels: 1­4 separates too light/too dark, defects resort to 5   channel that reclaim “good” wheat


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