When choosing a corn milling line, you need to comprehensively consider the characteristics of raw materials, finished product requirements, production scale, budget, energy consumption and post maintenance and other factors

I. Define production requirements

1. Raw material characteristics

Corn varieties: common yellow corn, white corn, glutinous corn, high oil corn (affecting the difficulty of de-embryoization).

Moisture content: general requirements ≤ 14% (too high need to be dried first).

Impurity content: high rate of impurity needs to strengthen the cleaning process (such as increasing the specific gravity of de-stoning machine).

2. Requirements for finished products

Product type Fineness (mesh) Key process Typical use

Corn grits 10-40 mesh Crushing + grading sieve Cooking porridge, feed

Ordinary corn flour 40-100 mesh Degerming + milling Food processing (cake, steamed bread)

Fine corn flour 100-200 mesh De-embryo + multi-stage milling Brewing, medical starch

Full nutrition corn flour 60-80 mesh Retaining the embryo, stone milling processing Healthy food

3. Capacity requirements

Small-scale Line: 0.5-5 tons/day (suitable for farmers, small processing plants, investment of 100,000-300,000 yuan).

Medium-sized line: 10-50 tons/day (food factory, feed factory, investment of 500-2 million yuan).

Large-sized line: more than 100 tons / day (need to customize automation solutions, investment of 3 million yuan +).

Second, the core equipment selection

1. Cleaning equipment

Initial clearing screen: to remove large impurities (straw, stones).

Magnetic separator: necessary to prevent metal damage to subsequent equipment.

Specific gravity de-stoning machine: recommended choice (especially when the raw material contains a lot of sand and gravel).

2. Debarking and de-embryoing equipment

High de-embryoing rate is required: choose combined de-embryoing machine (de-embryoing rate ≥90%).

Low-fat corn flour: must be equipped with germ separation system (such as wind selection + sieving).

3. Grinding equipment

Type of mill Advantages Disadvantages Applicable scenes

Hammer chip mill Low cost, suitable for coarse flour (40-60 mesh) Uneven fineness, high energy consumption Feed and grits production

Roller mill Uneven fineness (80-200 mesh) High investment, complicated maintenance Specialized flour for food and brewing

Stone milling unit Low-temperature milling, retaining nutrients Low energy production, many manual operations High-end health food

4. Grading and packaging

Vibrating sieve: Classify corn flour and grits (optional multi-layer sieve).

Pulse dust collector: necessary for environmental protection, avoiding the risk of dust explosion.

Automatic packaging machine: semi-automatic/full-automatic according to capacity.

Comparison of process programs

Program 1: simple corn grits production line (low investment)

Process: cleaning → crushing → grading → packaging

Equipment: cleaning screen + hammer mill + vibrating screen

Cost: 5-15 million yuan

Applicable: small-scale rural processing sites, feed raw materials

Option 2: Standard corn flour production line (de-embryo)

Process: cleaning → water moistening → de-embryo → grinding → grading → packaging

Equipments: stone removing machine + watering grain bin + de-embryo machine + roller milling machine + dust removal system

Cost: 30-1 million yuan

Applicable：Food factory, brewery enterprise

Option 3: Automatic fine powder production line

Process: cleaning → tempering → de-embryo → multi-stage grinding → sterilization → packaging

Equipments: PLC-controlled automatic production line with metal detector

Cost: 2 million yuan +

Applicable：export grade cornstarch, pharmaceutical starch

Fourth, the key purchase considerations

Material requirements

Food grade: stainless steel (such as 304) is required for the part of contacting materials.

Feed grade: ordinary carbon steel can be.

Energy consumption and efficiency

Roller mill saves 30%-50% energy than hammer flake type.

Large lines are recommended to be equipped with frequency converter to adjust the power.

After-sales service

Prefer suppliers that provide installation and commissioning, technical training.

Whether the wearing parts (screen mesh, grinding roller) are easy to replace.

Expandability

Reserve the interface, can be upgraded in the future (such as adding color sorter, packaging line).