Tianfeng TF-FZG-5m² In-Situ Pilot-Scale Freeze Dryer for Food Applications

Overview

The Tianfeng TF-FZG-5m² In-Situ Pilot-Scale Freeze Dryer is engineered for reproducible, GMP-aligned lyophilization of heat-sensitive food matrices—including fruits, vegetables, meat, seafood, functional ingredients, and nutraceuticals—under controlled vacuum and cryogenic conditions. Operating on the fundamental principle of sublimation, the system first freezes product uniformly on temperature-controlled shelves, then reduces chamber pressure below the triple point of water (≤2.7 Pa), enabling ice to transition directly from solid to vapor without passing through a liquid phase. This preserves native microstructure, volatile aroma compounds, thermolabile vitamins (e.g., vitamin C, B-complex), enzymatic activity, and cellular integrity—critical for maintaining organoleptic fidelity, rehydration kinetics, and shelf stability exceeding 24 months under nitrogen-sealed packaging. Unlike batch-transfer systems, its integrated in-situ design eliminates manual handling between freezing and drying stages, minimizing contamination risk and process variability. The unit bridges laboratory R&D and early-stage commercial production, supporting scale-up validation per ICH Q5C and ISO 22000–aligned protocols.

Key Features

• Monolithic stainless steel chamber and cold trap housing fabricated from ASTM A240 304 stainless steel with electropolished interior (Ra ≤ 0.4 µm), compliant with FDA 21 CFR Part 110 and EU Annex 1 hygienic design standards.
• In-situ freezing and drying within a single, sealed vessel featuring front-loading door with silicone gasket, double-glazed observation window with integrated LED illumination, and zero dead-leg geometry for clean-in-place (CIP) compatibility.
• Five plus one adjustable stainless steel or high-conductivity aluminum shelves (100 × 100 × 2 cm each), precision-machined for uniform thermal distribution; shelf spacing fixed at 65 mm to accommodate standard tray configurations and ensure laminar vapor flow.
• Cryogenic cold trap with high-surface-area stainless steel condenser coils, rated for continuous capture of up to 100 kg ice over 24 hours at ≤−65 °C—validated via ASME Section VIII Div. 1 pressure vessel certification.
• High-efficiency refrigeration system utilizing premium-grade semi-hermetic compressors (imported components), achieving ≤−65 °C cold trap temperature in <120 minutes from ambient and maintaining thermal stability ±0.5 °C during primary drying.
• Dual-mode vacuum system incorporating ULVAC (formerly Anelva) high-vacuum pumps with oil-free backing options; ultimate vacuum verified per ISO 20484:2017 using calibrated Pirani and capacitance manometers.

Sample Compatibility & Compliance

The TF-FZG-5m² accommodates heterogeneous food samples ranging from thin-layer fruit purees (≤15 mm depth) to whole berries, sliced root vegetables, minced proteins, and viscous hydrocolloid-based formulations. Its shelf temperature range (−45 °C to +80 °C) supports both slow nucleation freezing for crystalline structure preservation and rapid vitrification for amorphous matrix stabilization. All wetted surfaces meet EC 1935/2004 food contact material requirements. Design documentation includes full traceability of weld procedures (ASME BPVC IX), surface finish verification reports, and FAT/SAT protocols aligned with ISO 13485 and GAMP 5 guidelines. Optional IQ/OQ documentation packages are available for GLP/GMP-regulated environments.

Software & Data Management

Control is executed via an Omron CJ2M PLC interfaced with a ruggedized industrial PC running proprietary freeze-drying software (v4.2+). The system logs ≥10,000 data points per hour—including shelf temperature (PT100), chamber pressure (capacitance gauge), condenser temperature, and vacuum pump status—with timestamped, encrypted binary storage. Audit trails comply with FDA 21 CFR Part 11 requirements: electronic signatures, role-based access control (admin/operator), immutable record retention, and export to CSV/PDF. Remote monitoring and recipe management are enabled via TLS-secured web interface or MQTT protocol integration into existing MES/SCADA platforms. All process parameters support deviation alerts, automatic hold-on-failure logic, and real-time trending with configurable alarm thresholds.

Applications

This system serves validated applications across food science research and pilot manufacturing: development of instant soup bases with intact herb volatiles; stabilization of probiotic cultures in dairy matrices; production of lightweight, shelf-stable snack pellets from jackfruit or sweet potato; dehydration of delicate edible flowers without pigment degradation; and lyophilization of bee pollen and royal jelly while retaining bioactive peptides and flavonoids. It further supports formulation studies for functional food powders intended for encapsulation, tabletting, or direct incorporation into beverages—where solubility, dispersibility, and oxidation resistance are critical quality attributes.

FAQ

Is the TF-FZG-5m² suitable for regulatory submission batches?

Yes—when operated with documented SOPs, calibrated sensors, and full electronic batch records, it meets requirements for Phase I–II clinical nutrition trials and novel food dossiers submitted to EFSA or FDA.
Can shelf heating be used during primary drying?

Yes—electric shelf heating (9 kW option) enables controlled ramping during secondary drying to remove bound water without collapse, particularly for high-sugar or low-Tg formulations.
What validation support is provided?

Factory acceptance testing (FAT) includes vacuum leak rate verification (<0.1 Pa·m³/s), temperature mapping (ASTM E2297), and pressure rise tests. On-site IQ/OQ services are available upon request.
Does the system support automated defrost cycles?

Yes—programmable steam or immersion defrost modes minimize downtime; cycle duration and condensate drainage are fully logged and reportable.
Are spare parts and service available internationally?

Tianfeng maintains regional technical hubs in Germany and Singapore; critical spares (valves, sensors, PLC modules) are stocked globally with <72-hour dispatch for priority orders.