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Corn and sweet corn processing
IQF sweet corn kernels, canned corn, corn flour, grits, flakes
Corn and sweet corn processing line by GEM Foodtech, Kolkata, India — capacity 1 to 20 tonnes per hour, final yield 31% of raw intake, delivered as a turnkey plant with installation and commissioning worldwide.
The commercial reality
Sweet corn runs on the same clock as peas — sugars fall away within hours of harvest. Dry corn is a different business entirely, built around milling and drying. This line covers both because most plants that start with one add the other.
Process flow diagram
Generated for the standard configuration. Yours is redrawn to your product mix, capacity and site.
Process chart
Every stage with the equipment that performs it, the operating parameter and the control point that decides quality.
| # | Stage | Equipment | Parameter | Control point |
|---|---|---|---|---|
| 01 | Husking and desilking | Inspection and sorting conveyor | Husker and desilker | Husk and silk removed |
| 02 | Cutting from cob | Sheller and decorticator | Cob cutter, whole kernel | Kernel integrity, low cob content |
| 03 | Washing and grading | Fruit and vegetable washer | Flotation wash and grader | Cob fragments and light material out |
| 04 | Blanching | Blancher and cooler | 90–95 °C, 90–150 s | Enzymes inactivated |
| 05 | Cooling and dewatering | Blancher and cooler | Chilled water then air knife | Surface water removed |
| 06 | IQF freezing or canning | IQF tunnel freezer | Fluidised tunnel or retort line | Core at −18 °C, or commercial sterility |
| 07 | Drying, for flour route | Belt dryer and dehydration system | Belt dryer to 12–13% moisture | Safe storage moisture |
| 08 | Milling and grading | Grinder and pulveriser | Roller or hammer mill, sifter | Grit and flour fractions |
Mass balance
Basis of 1,000 kg of raw material. Change the tonnage below and the whole table rescales.
| Stage | Output, kg/h | Yield | Loss, kg/h | Where the loss goes |
|---|---|---|---|---|
| Cobs received | 1,000 | 100% | 0 | — |
| After husking and desilking | 620 | 62% | 380 | Husk and silk to feed or silage |
| Kernels after cutting | 330 | 33% | 290 | Cob to feed or biomass fuel |
| After blanching and grading | 320 | 32% | 10 | Fines and cob fragments |
| IQF packed | 310 | 31% | 10 | Freezer losses |
By-products: Husk, silk and cob as cattle feed or boiler fuel — significant volume that pays for its own handling.
Equipment schedule
Core machines for this line. Conveying, tanks, CIP and utilities are added to suit the layout.
| Equipment | Capacity range | Function |
|---|---|---|
| Inspection and sorting conveyor | Preparation | Manual or optical removal of unripe, damaged and foreign material. |
| Sheller and decorticator | Separation | Cracks and separates shell from kernel on cashew, peas and corn. |
| Fruit and vegetable washer | Preparation | Removes field soil, latex and surface load with recirculated, filtered water. |
| Blancher and cooler | Thermal | Inactivates enzymes, sets colour, then cools to arrest cooking. |
| IQF tunnel freezer | Freezing | Individually quick frozen product with minimal ice crystal damage. |
| Belt dryer and dehydration system | Drying | Multi-zone drying with controlled curve — the GEM core competence. |
| Grinder and pulveriser | Size reduction | Hammer, pin or cryogenic milling to a controlled mesh. |
Questions we get on this line
IQF or canned?
IQF holds a better texture and sells higher, but needs a cold chain. Canning is more forgiving in distribution. Many plants run both from a shared front end.
What is the kernel yield?
About 30 to 35% of cob weight. The remaining two thirds is why by-product handling belongs in the design from the start.
What capacity range does the corn line cover?
Standard GEM Foodtech builds cover 1 to 20 tonnes per hour. Larger duties are engineered to order — the right size is set by the raw material supply through the season, not the nameplate figure.
Is this supplied as a complete turnkey plant?
Yes. The Corn and sweet corn processing line is delivered end to end — feasibility, pilot trial on your own material, engineering, manufacture in Kolkata, installation, commissioning and operator training — or as individual machines to fit an existing plant.
Want this line costed for your tonnage?
Send the raw material specification and the capacity you are targeting. You get a flow diagram, an equipment schedule and a budget number.