Continuous Vegetable Blanching Line 3000

Blanching is a small step that decides a lot. Done unevenly, the colour goes patchy, the texture softens unpredictably and the fryer or freezer downstream has to absorb the variation. A continuous line fixes the process at a fixed time and temperature instead of leaving it to a batch operator.

Why blanch at all

The blancher's job is to deactivate the enzymes that keep working after harvest. Left alone, those enzymes drive browning, off-flavours and texture loss during freezing and storage.

Running product through a controlled hot-water bath stops that process at a set point. In practice this is what holds the natural colour of the raw material, softens cell walls so the product handles without shattering, and opens the tissue so later moisture removal — frying or drying — happens evenly.

The line in four units

The 3000 model is a continuous line built around four units, run in sequence.

1. Blanching machine. A 30 kW electrically heated blancher with a 600 mm mesh belt and 3 mm mesh openings. Belt speed is controlled by a Siemens variable-speed motor, which is how the dwell time in the bath is set. The tank is 304 stainless steel including the bearing seats, with 70 mm insulation to hold temperature and Schneider electricals.

2. Cooling washer. Immediately after the bath, product passes through a 4.4 kW cooling and washing unit on a 3500 x 1200 x 1300 mm frame. Air-bubble agitation is driven by a Kaiyuan motor with Siemens speed control on the 800 mm belt, through 5 mm mesh. This stage sets the cooling time precisely before freezing or drying — important for long, fragile products that would otherwise carry heat into the next process.

3. Vibrating de-waterer. A 0.5 kW unit on a 1800 x 1500 x 1300 mm frame, built from 3 mm 304 stainless steel on a 100 x 50 x 5 mm frame. A 0.25 kW vibration motor with adjustable amplitude shakes surface water off and spreads the product into an even layer for drying.

4. Flip-type air-blower dryer. An 8 kW dryer on a 4000 x 1200 x 1600 mm frame, with Siemens speed control and a four-pass mesh belt 800 mm wide. Eight fans at 0.75 kW each feed knife-type air nozzles, and a water and oil receiving tray sits under the air duct. The flipping belt turns the product so both faces are dried.

Specifications

Where the line fits

The 3000 line is the middle stage of a vegetable or fruit process. Upstream it takes washed, cut product, so it usually follows a vegetable washing machine and a vegetable cutting machine. Downstream it feeds a fryer, a freezer or a drying stage.

Related equipment that is normally specified alongside it includes air-bubble cleaning washers, brush-roller peeling and washing machines for root vegetables, flat-roller impurity removers, french fry cutters, potato chip slicers and bottom-discharge dewatering machines.

Where the volume is smaller or the product needs batch control rather than continuous flow, a batch blanching machine is the better match — the two are complementary rather than alternatives.

FAQ

How is the blanching temperature and time controlled?

Temperature is held by 30 kW of electric heating in the tank. Time is set by the Siemens variable-speed drive on the 600 mm mesh belt, so dwell in the bath is adjusted by belt speed rather than by hand.

Why is there a cooling stage?

Cooling stops the cooking process at the intended point. Without it, residual heat keeps working on the product during transfer and the texture drifts.

Does the line handle delicate products?

Yes. The 800 mm belt and precise cooling stage were chosen for long, fragile items that are easily damaged by handling.

Is the line built for washdown?

The tanks, frames and belts are 304 stainless steel, including the bearing seats, with electricals from Siemens and Schneider.

Can it be integrated with existing equipment?

Yes. The units are separate frames, so the line can be placed between existing washing and cutting equipment upstream and a fryer, freezer or dryer downstream.

What products is it used on?

Vegetables and fruits that need colour and texture held before freezing, frying or drying — including root vegetables and cut or sliced products.