Milk Tofu and Milk Skin Vacuum Freeze Drying Machine

Milk Tofu and Milk Skin Vacuum Freeze Drying MachineAn industrial equipment specifically designed for vacuum freeze-drying milk tofu (a traditional Mongolian dairy product similar to cheese, with a solid texture and rich flavor).

The core principle is to directly sublime the frozen solid water (ice) in milk tofu into water vapor in a low-temperature, vacuum environment, thereby achieving dehydration without going through the liquid state or damaging its physical structure.

Pre freezing stage:

Put the sliced or diced tofu into a tray and quickly freeze it in a freeze-drying or freezer to below its eutectic point (usually much lower than -30 ℃). This step is crucial to ensure that the water freezes into solid ice crystals.

Extract the warehouse to a high vacuum (usually below 100 Pa).

Slowly provide heat through the heating plate (but the material temperature is still far below 0 ℃).

Ice crystals sublime directly from the solid state into water vapor, which is pumped away by a vacuum pump and captured by a cold trap (condenser) to condense into ice. At this stage, the vast majority of free water was removed.

Secondary drying (analytical drying):

Under higher temperature and continuous vacuum, remove adsorbed water and bound water that are more tightly bound to the material.

Ultimately, the moisture content of milk tofu is reduced to below 2% -5%, meeting the standard for long-term preservation.

Milk Tofu and Milk Skin Vacuum Freeze Drying MachineThe advantages of freeze-dried tofu

Shape and color preservation: Maintain the original shape, porous and fluffy structure, without shrinkage or deformation.

Lock in core flavor and nutrition: The low-temperature process preserves the protein, fat, active substances, as well as the unique milk aroma and slightly sour flavor of tofu.

Crispy texture: The finished product has a light and crispy texture that melts in the mouth, creating a brand new snack experience.

Ultra long shelf life: The extremely low water activity inhibits the activity of all microorganisms and enzymes, without the need for any preservatives, and can be stored for several years at room temperature.

Good rehydration ability: After absorbing water, it can quickly restore the taste similar to fresh tofu (although it is usually eaten directly as a snack).

Lightweight and portable: With greatly reduced weight, it is very suitable as a travel, outdoor, and leisure snack.

The main components of the equipment are the system

A complete vacuum freeze dryer typically includes:

Freeze drying chamber: a sealed, cooling/heating chamber for placing material trays.

Refrigeration system: provides ultra-low temperature cooling capacity for the cold trap and freeze-drying chamber.

Heating system: Provides controllable sublimation heat (usually electric heating or silicone oil circulation heating).

Vacuum system: composed of a vacuum pump group (such as Roots pump+rotary vane pump), which extracts air and water vapor.

Cold trap (condenser): An extremely low temperature surface used to capture sublimated water vapor and condense it into ice.

Control system: PLC or computer automatic control system, which can set and monitor the freeze-drying curve (temperature, pressure, time).

Cleaning and sterilization systems are particularly important for food grade production.

Key points for purchasing

If you are considering purchasing or leasing this device, please pay attention to:

Production scale: determines equipment size (such as warehouse area ranging from a few square meters to hundreds of square meters).

Material characteristics: Tofu has a high fat and sugar content and requires precise temperature control to prevent melting or collapse.

Automation level: manual, semi-automatic, fully automatic, affecting labor costs and batch stability.

Energy consumption: Freeze drying is a process with high energy consumption, and energy-saving design (such as high-efficiency compressors and heat recovery) is crucial.

Compliance: It must comply with food production safety standards, and the material (such as 304 or 316L stainless steel) and design should be easy to clean.

Supplier services: installation, debugging, process development, and after-sales service are crucial.

Brief description of production process flow

Raw material processing: Fresh milk tofu → cut into uniform pieces/slices/strips.

Packing: evenly spread on a tray with consistent thickness.

Pre freezing: Completed in a freeze-drying warehouse or a separate quick freezing warehouse.

Vacuum freeze-drying: Run the preset freeze-drying program, which may take anywhere from tens of hours to several tens of hours.

Breaking the empty material: After drying, inject clean and dry air into the warehouse and remove the product.