Frequently Asked Questions

Choose based on your raw material batch target: QS-FD-20 (20.16 m², 84 trays) processes ~200 kg/batch for pilot runs or high-value yogurt cubes and pet treats; QS-FD-100 (103.68 m², 432 trays) handles ~1,000 kg/batch for standard commercial factories; QS-FD-200 (207.36 m², 864 trays) processes ~2,000 kg/batch for mass export lines.

While rated total power is 35 kW (QS-FD-20) and 135 kW (QS-FD-100), both the cryogenic two-stage refrigeration system and the Roots/screw vacuum pumps operate at approximately 60% of their rated power during normal cycles, and the compressor automatically shuts off based on the material's freeze-drying degree. For QS-FD-200, total installed power is confirmed by engineering in the project quotation.

Our square inner chamber (made of mirror-finished SUS304 reinforced with welded square steel pipes) eliminates the dead space of old cylindrical tanks, saves workshop floor space, reduces vacuum pumping volume for higher energy efficiency, and supports front-opening track loading with dry and wet separation.

Our vacuum system allows the Roots vacuum pump to start directly at atmospheric pressure alongside the screw pump. This drastically shortens pre-evacuation time so frozen materials enter the sublimation phase before they can thaw, bubble, or collapse.

Our aluminum alloy electric heating shelves feature 4 independent temperature control channels with ±0.1°C accuracy (up to 80°C), so different shelf zones can follow different heating profiles in one batch. Whether four different products can share one batch depends on compatible cycles — confirm with a product-specific review.

The cold trap features an SUS304 outer casing, internal Φ22mm 304 stainless steel piping, and an ultra-large surface area pure copper tube coil monitored by a custom PT1000 sensor. It uses fast water bath or spray defrosting with bottom drainage (equipped with a heating wire).

We use Siemens S7-200 CPU, Siemens I/O & temperature modules, Siemens V4 HMI touchscreen (Chinese/English menus), Danfoss TEX2-05 expansion valves, Danfoss EVR solenoid valves, Mingwei power supplies, Schneider relays/contactors, Yangming SSR, and Delixi circuit breakers.

Taking sweet potato as an example: QS-VF100 (100 kg raw/batch) yields 30–50 kg in 25–80 min; QS-VF150 (150 kg raw/batch) yields 30–50 kg in 25–80 min; QS-300 (300 kg raw/batch) yields 100–200 kg in 40–60 min, at 80–100°C oil temperature and −0.092 to −0.098 MPa vacuum. These are processing times for sweet potato and depend on the material — loading, unloading, de-oiling, cleaning and changeover are not included.

Our vacuum fryers are rated at oil content < 18%, confirmed by product-specific testing. A 304 stainless steel upper oil removal assembly driven by a VFD motor (adjustable from 5 to 750 r/min) spins off oil under vacuum before air re-enters.

Every unit includes a dedicated 304 stainless steel oil-gas separator (oil-vapor catcher), piping, and valve assembly. When water vapor boils off rapidly under vacuum, the separator condenses and returns entrained oil droplets back to the kettle.

All three models use steam coil heating requiring 0.4–0.8 MPa steam pressure. Steam consumption is 150 kg/h for QS-VF100 and QS-VF150 (10 m² steam heater), and 250 kg/h for QS-300 (18 m² steam heater).

Per the specification, the user needs to prepare: 1) FRP Cooling Tower (flow rate 30 m³/h, 1 set) for hot water cooling; 2) Air Compressor (3 kW, 0.5–0.8 MPa, 1 set) for pneumatic actuators; 3) Cooling Water Pool (20 m³) and steam supply. We can also supply the cooling tower and air compressor on request.

Beyond larger capacity (Φ1600×2600mm tank, two Φ1300×600mm baskets, 18 m² steam heater), the QS-300 adds a 3 kW Roots vacuum pump, a 4 kW Botou gear pump for hot oil circulation, an insulated low-level oil storage tank (t=4mm SS), an inline oil residue filter, a screw-cap lid bracket, an automatic feeding/unloading machine, and an anti-slip operating platform.

The vacuum fryer inner body is fabricated from heavy-duty 6.0 mm stainless steel plate, wrapped in a 50 mm thermal insulation layer and a 2.0 mm stainless steel outer jacket, supported by t=5mm welded stainless steel round tube outriggers.

Yes. Standard configuration is 380V/220V 50Hz 3-Phase, and we regularly customize transformers, motors, and control cabinets for 220V, 400V, 415V, 440V, or 480V (50Hz or 60Hz) for North America, Europe, Southeast Asia, Latin America, and the Middle East.

Absolutely. You can ship or courier your raw materials — or ask us to source identical fresh produce locally in China. We will process them in our test workshop, record a full video report, and send the finished freeze-dried or vacuum-fried samples back to you. The trial processing is free; you only cover the shipping.

Our MOQ is 1 set. Production lead time is approximately 3 months, depending on model size and voltage customization. The exact schedule is confirmed in the project quotation.

We provide complete foundation drawings, piping & wiring diagrams, and English operation manuals prior to arrival. Once the machine lands, we offer 1-on-1 remote video guidance or dispatch our senior engineers to your plant for on-site installation, vacuum testing, and staff training.

Yes, both the Siemens V4 HMI (on freeze dryers) and Kunlun Tongtai/Delta HMI (on vacuum fryers) feature bilingual Chinese & English menus (other languages customizable). Operators can save, name, and recall multiple temperature and vacuum recipes with one touch.

The quotation includes a recommended spare-parts list (food-grade O-shaped silicone seals, PT100 sensors, relays, buttons, fuses, and filter elements). Because our core electrical and refrigeration parts are Siemens, Danfoss, Schneider, and Delta, standard replacements can also be sourced locally in most markets.