Vacuum Freeze Dryer

Industrial Freeze Dryer Systems | Vacuum Freeze Dryer

Sized from your product, not from a catalogue

Production in 60 to 120 working days

Commissioned and handed over by our own engineers

12 months from delivery on mechanical parts

Shengtu builds vacuum freeze dryers for food plants that have to hold shape, colour and nutrition while pulling moisture down to a shelf-stable level. We start from what you are drying and how much water has to leave it each day, then set shelf area, condenser duty, vacuum sizing and heating method around that answer.

Send Your Product Brief for a Quote

Production lead time

60 to 120 working days from the date the deposit clears

Payment

Telegraphic transfer against a deposit at order confirmation, or a letter of credit

Warranty

12 months from delivery on manufacturing defects in mechanical components; electrical parts and normal wear items are excluded

Installation

Our engineers travel to your site to direct installation, complete commissioning and train your operators

Industrial Freeze Drying Capability

Buyers of industrial freeze drying equipment nearly always open with the wrong question. They ask how many kilograms a chamber holds. The number that decides whether the investment works is how many hours a load takes and therefore how many loads a year the machine will ever run.

A chamber gets sized on batch weight, the business case gets built on annual output, and nobody writes down the cycle time that connects the two. That gap is where the argument starts later. We put the number on the table before we quote, even when the answer is inconvenient.

The vacuum freeze drying process itself is not in dispute. The product is frozen solid, the chamber is pumped below the triple point of water, and heat is fed through the shelf so ice turns straight to vapour without passing through liquid; that vapour re-freezes on a cold condenser rather than passing through the vacuum pump.[1] Sublimation is the step in the drying process that consumes most of the energy, and peer-reviewed work puts the phase change at roughly 2,840 kJ for every kilogram of ice removed.[2]

The Four Stages We Build Around & Integration

Freezing

The product is brought down to a solid state, either in a separate blast room where airflow does the work or directly on the shelf. Ice crystal size is set here, and it governs how fast vapour can escape later. Everything the preservation result depends on is decided in this stage.

Vacuum draw-down

The chamber is evacuated below the triple point of water so sublimation can begin.

Primary drying

Shelf heat is supplied at a controlled rate to sublime the free ice. This is the longest stage and the one that consumes most of the energy.[1]

Secondary drying

The shelf is warmed further to desorb bound water and bring the product down to its target residual moisture.

Batch Freeze Drying

Trays are loaded on trolleys, the chamber door is closed and one recipe runs to completion. This is the right build when you run several products, change over often, or need each batch traceable as a unit.

Whole-Line Integration

The freeze dryer is one station, so we plan the blast freezer, trolleys, loading rail and the downstream packing step together and the dryer is not left waiting on the stations either side of it. Where the same plant also runs a coating section, we build that battering and breading line as well. High-volume producers running a single product without changeover should weigh a continuous plant against a batch one before committing.

Equipment Applications [3]

Fruit slices, purées & berries
Vegetable dice, leafy veg & herbs
Meat, poultry & seafood pieces
Instant coffee, tea & extract
Pet food & freeze dried treats
Probiotics, enzymes & cultures
Ready meals & meal components
Bulk food & beverage ingredients

STUnit Platform

Control is built on our own STUnit platform, with low-code control boxes, multi-protocol gateways and edge algorithms so recipe curves, alarms and batch records stay on the machine and remain readable by your plant systems.

Products This Freeze Dryer Machine Handles

What changes between products is not the machine. It is the water. Sugar content, slice thickness and cell structure decide how long each kilogram of ice takes to leave, and that is why we ask for the product before quoting a configuration.[3]

SPEC // FRT-01

Freeze Dried Fruit Application in Vacuum Freeze Dryer

SPEC // VEG-02

Freeze Dried Vegetable Application in Vacuum Freeze Dryer

SPEC // MET-03

Freeze Dried Meat Seafood Application in Vacuum Freeze Dryer

SPEC // BEV-04

Freeze Dried Coffee Tea Extract Application in Vacuum Freeze Dryer

SPEC // PET-05

Freeze Dried Pet Food Application in Vacuum Freeze Dryer

SPEC // PRO-06

Probiotics and Functional Ingredients Application in Vacuum Freeze Dryer

Fruit

Forms we run Slices, dice, halves, purée, whole berry

Why it is freeze dried Colour and cell structure survive, so the piece rehydrates to something close to fresh instead of a chewy fragment.

Cycle driver High sugar lowers the collapse temperature, so shelf heat has to be fed more slowly.

Watch out for Thick slices. Cutting from 10 mm (0.39 in) to 6 mm (0.24 in) shortens drying far more than raising shelf temperature does.

Vegetable and Herb

Forms we run Dice, strips, leaf, blanched pieces

Why it is freeze dried Volatile aroma and green colour hold up in a way hot air drying cannot match.

Cycle driver Very high starting moisture, so the water load per kilogram of fresh input is at the top of the range.

Watch out for Leafy material packs unevenly on the tray and dries at different rates across the shelf.

Meat, Poultry and Seafood

Forms we run Cubes, strips, mince, whole small seafood

Why it is freeze dried Protein structure is preserved without cooking, and the finished piece is light enough to ship anywhere.

Cycle driver Fat content. Fat does not sublime and it slows vapour escape from the piece.

Watch out for Uniform piece size matters more here than in any other category.

Instant Coffee, Tea and Extract

Forms we run Frozen extract slab, granulate

Why it is freeze dried Aroma compounds are lost to heat, so freeze drying is the process behind premium instant grades.

Cycle driver Slab thickness and the granulate size you break it down to before loading.

Watch out for Extract solids concentration set upstream decides how much water you are paying to remove.

Pet Food and Treats

Forms we run Raw meat medallions, organ pieces, mixed patties

Why it is freeze dried Raw nutrition claims survive the process, and the finished treat is shelf stable without preservatives.

Cycle driver Piece thickness and fat, in that order.

Watch out for Loading density. Packing more onto the tray to raise batch weight lengthens the cycle more than it adds output.

Probiotics & Functional Ingredients

Forms we run Cell concentrate, enzyme solution, encapsulated powder

Why it is freeze dried Viability depends on never letting the material warm past its collapse point.

Cycle driver A narrow allowable product temperature window, which means a slower, tightly controlled shelf ramp.

Watch out for These runs need shelf-to-shelf temperature uniformity more than they need raw capacity.

Configuration Variables

Heating and Defrost Options

Two choices set most of the running cost of an industrial freeze dryer. One is how heat reaches the shelf; the other is how the condenser is cleared between batches. Both get decided at configuration, not afterwards, and both serve the same mechanism: shelf-supplied heat under a controlled draw-down below the triple point.[7]

Option	How it works	Where it fits	Effect on the cycle
Electric shelf heating	Resistive elements or a heated fluid loop raise the shelf directly.	Smaller and mid-size chambers, and plants with no steam supply.	Simplest to install and control. Electricity carries the whole heating load.
Steam or thermal-fluid heating	Plant steam or a heat-transfer fluid circulates through the shelf.	Large chambers in plants that already run a boiler.	Shifts heating off the electrical supply. Needs boiler capacity in your utility plan.
Single water defrost	The condenser is flooded once at the end of the batch to melt the ice off.	Single-shift operations with slack between batches.	Lowest cost. Adds the longest gap between one batch and the next.
Steam defrost	Steam clears the condenser coil faster than water alone.	Plants already committed to a steam supply.	Shortens the gap between batches, which is where extra annual output comes from.
Alternating automatic defrost	The condenser is split so one half sheds ice while the other stays in service.	Continuous or near-continuous running.	Highest capital cost. Removes defrost from the critical path almost entirely.

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Vacuum Freeze Dryer Condensing Unit Detail

Vendor Neutrality Guarantee

We do not lock the machine to a single component brand. Where you already standardise on a refrigeration or control supplier for the rest of the plant, say so with your brief and we will build to that requirement so your spares stay common.

Sizing an Industrial Freeze Dryer by Water Load

A freeze dryer’s nameplate is not its output. What you are actually buying is a rate of water removal, and the trade press already reports industrial plant capability that way, in kilograms of ice sublimated per hour rather than in tray area.[6] Below is the ladder we climb on every machine we quote, with the owner of each number named on its own rung.

The Water-Load Ladder

Rung	What it is	Whose number	Worked example — your figures replace these
1. Product and cut	The item and the thickness it is prepared to	Yours	Sliced strawberry at 8 mm (0.31 in)
2. Incoming moisture	Water fraction of the fresh product by weight	Yours	91%
3. Target residual moisture	The finished specification you have to meet	Yours	3%
4. Water to remove	Rungs 2 and 3 turned into kilograms of water per 100 kg of fresh input	Derived	90.7 kg (200 lb) of water per 100 kg (220 lb) fresh
5. Loading density	Fresh product carried per square metre of shelf, set by piece size and how it packs	Yours, by trial	8 kg/m² (1.6 lb/sq ft)
6. Shelf area needed	Batch size divided by loading density	Derived	62.5 m² (673 sq ft) for a 500 kg (1,102 lb) batch
7. Cycle time	Freeze, draw-down, primary drying, secondary drying and defrost, established by trial on your product	Yours, by trial	24 hours
8. Batches per day	24 divided by rung 7	Derived	1
9. Daily fresh input	Rung 6 batch size times rung 8	Derived	500 kg (1,102 lb) per day
10. Annual finished product	Daily input, operating days, minus the water from rung 4	Derived	About 13,900 kg (30,600 lb) at 300 operating days
11. Condenser duty	Water removed per hour during primary drying, which is what the condenser has to trap	Ours to engineer	Set from rungs 4 and 7 with your product’s drying curve

Why This Is a Method and Not a Model Table

Rungs 1 to 3 are yours. Nobody can supply them for you, and a configuration quoted without them is a guess.

Rung 7 comes from running your product, not from a brochure. It is the single number that decides annual output.

Rungs 5, 6 and 11 are what we engineer. Your machine’s configuration sheet is issued with the quotation, once rungs 1 to 3 are on the table.

Two plants buying the same chamber can end up with very different annual output, purely because their cycle times differ.

Three Instincts That Cost Buyers Money

Contrary to the common assumption, faster sublimation happens when system pressure sits near half the vapour pressure above the product, not at the deepest attainable vacuum, because heat becomes harder to transfer into the piece as pressure falls.[4] Heated shelves exist precisely to widen that temperature difference and move moisture faster.[1]

The condenser has to run 15 to 20 °C (27 to 36 °F) below the product; for an aqueous product about −50 °C (−58 °F) is enough, and going colder buys you cost rather than speed.[4] What matters instead is whether the condenser can trap the vapour rate your load actually generates.

Published cost modelling of a freeze drying cycle reaches the opposite conclusion to the one most buyers expect: capital cost was 91 per cent of the total cost of a cycle on a seven-day week and 95 per cent on a five-day week, so the return comes from fitting more cycles into the machine’s life rather than from shaving kilowatts.[2]

Industrial Vacuum Freeze Dryer Chamber Front

Quotation Basis, Lead Time and Payment

Every machine is tailored to the product it will run, so there is no price list for build-to-order equipment. Your figure follows chamber volume and shelf area, condenser duty, refrigeration and vacuum sizing, heating method, and how much automation you want. It also depends on whether the scope stops at the dryer or takes in blast freezing, trolleys and packing.

Send Brief for Quote →

What Moves the Number

Driver	Effect on cost	How to hold it down
Shelf area	The largest single driver, since chamber, trolleys, heating and structure all scale with it.	Fix loading density by trial before sizing, so you buy the shelf you need rather than the shelf you guessed.
Condenser duty	Set by peak water removal rate, not by batch weight.	A thinner cut spreads the same water over more hours and lowers the peak.
Heating method	Steam heating shifts load to a boiler you may already own; electric heating puts it all on the incoming supply.	Check what your utility plan already supports before choosing.
Defrost arrangement	Alternating automatic defrost costs more to build and buys back time between batches.	Only worth it if you will actually run the extra batches.
Automation depth	Recipe management, batch records and remote access add control cost.	Specify the records you are audited on, not every record that exists.
Scope boundary	Blast freezer, trolleys, loading rail and packing can double the project against the dryer alone.	Ask for the quotation itemised so you can stage the purchase.

How Your Quotation Is Produced

Initiation

You send the product, target output and your building constraints.

Engineering Evaluation

An engineer climbs the water-load ladder above and comes back with the questions your brief did not answer.

Formal Proposal

You receive an itemised written quotation: equipment scope, quantity and delivery arrangement, documents supplied with the machine, packing and shipping method, and the acceptance arrangement.

Production & Settlement

Production is scheduled at 60 to 120 working days from the date the deposit clears, confirmed against your specific configuration in the quotation. Orders are settled by telegraphic transfer against a deposit at order confirmation, or by letter of credit.

Inspection, Testing and Warranty

A vacuum chamber either holds its pressure or it does not. That gets checked before the machine leaves us, not after it reaches you. Trust in this category is built on what is verified at the factory gate.

How Every Machine Is Checked

Chamber and condenser welds are inspected, then the assembly is pressure and leak tested.

The vacuum pump set is run and the empty chamber is held under vacuum to confirm the seal.

Refrigeration is charged, the compressor set is pulled down, and condenser temperature is confirmed against the recipe range.

Shelf heating is stepped through its range and temperature is logged shelf by shelf to ensure uniformity across the stack.

A simulated run exercises the control sequence end to end before packing begins.

Equipment Warranty

Equipment carries 12 months from delivery on manufacturing defects in mechanical components. Electrical components and parts subject to normal wear are excluded, which is the same boundary the quotation states in writing.

What Happens When Something Breaks

The spare parts list is agreed at order, not after a stoppage. Buyers on public forums report vacuum pumps and control systems as the first things to give trouble, so those are the items to stock.

Wear items are named in the quotation with their replacement interval, so your maintenance plan can be written before the machine arrives.

Remote access through the control platform lets our engineers read alarms and recipe logs with you rather than asking you to describe a fault over email.

Where a part is a standard industrial component rather than something proprietary to us, we say so, because that means you can source it locally as well as from us.

Company Qualifications

ISO9001 quality management system

ISO27001 information security management system

DCMM Level-2 data management capability maturity

SRDI enterprise status (specialized, refined, differentiated and novel small and medium enterprise)

Gazelle Enterprise status

7 patents and more than 100 software copyrights across our equipment platform

Click center image to enlarge • Click side images to rotate

How We Work: From Brief to Commissioning

Send your product brief

Product, cut, incoming moisture, target residual moisture, the output you need and your building constraints.

Sizing review

An engineer climbs the water-load ladder and tells you what is missing before anything is priced.

Itemised quotation

Scope, configuration sheet, delivery arrangement and acceptance terms in one document.

Vacuum Freeze Dryer Engineering Control Cabinet

Vacuum Freeze Dryer Factory Build and Chamber Shelves

Build and factory testing

The inspection sequence above, completed and recorded before shipping.

Delivery and site assembly

Machines of this size ship in sections and are assembled at your plant.

Commissioning and handover

We do not consider the job done at delivery. Our engineers travel to your site to direct installation and train operators.

Who Does What on Site

Item	Shengtu	Your plant
Sectional delivery and positioning plan	Supplied with the configuration sheet	Access route, floor loading confirmed
Lifting gear, tools and skilled trades	—	Forklift, crane, welding equipment, welder, fitter, electrician
Assembly supervision	Our engineer directs the sequence on site	Your crew executes under that direction
Utilities to the machine	Requirements issued in advance	Power, water and any steam supply terminated at the machine
Commissioning and operator training	Carried out by our engineer through to a completed batch	Operators released to attend
Travel and accommodation	Quoted as a separate line	Confirmed with the order

Important Note:

Two of the three calculators above ride on the same arithmetic our engineers use, so the numbers you arrive at yourself and the numbers in the sizing review should agree.

System Warnings

Commodity dried product sold on price

Why it works against you: Sublimation is the most energy-hungry step in the process, and no configuration changes that.[1]

What to do instead: Hot air or belt drying for the commodity line, and keep freeze drying for a premium grade that carries the cost.

Very high sugar or high fat product

Why it works against you: A low collapse temperature forces a slow shelf ramp, so the cycle stretches and output per day drops.

What to do instead: Reformulate, cut thinner, or accept the longer cycle and size the machine for it rather than being surprised by it.

Buying capacity to fix a line bottleneck

Why it works against you: A bigger chamber does nothing for annual output if freezing, loading or packing sets the pace.

What to do instead: Time the whole sequence first. Shortening changeover and defrost often buys more annual output than a larger chamber.

Live Assembly Feed

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Workshop Data

Chamber, skid frame and overhead loading rail during assembly in our workshop.

Refrigeration condensing unit with high and low pressure gauge panel, assembled and piped in house.

Product rendering showing the operator panel and vacuum pump skid layout. This image is a rendering, not a photograph.

A short walkthrough video of an assembled unit is available on request with your product brief.

Advanced Vacuum Freeze Dryer Production & Energy Calculators

Water-Load and Shelf Area Calculator

Rungs 1 to 6 of the Water-Load Ladder. Enter your product and this works out how much water actually has to leave the chamber, and how much shelf that batch needs.

Access Calculator ➔

Batch to Annual Output Converter

Rungs 7 to 10 of the Water-Load Ladder. Cycle time is the number that turns a batch weight into an annual figure, and it is the number most quotations leave out.

Access Converter ➔

Freeze Drying Energy Cost Estimator

This tool deliberately does not supply an energy figure. Published values for energy per kilogram of water removed differ by close to an order of magnitude depending on what the scope includes, so the only honest version of this calculation uses a figure you have measured or been quoted.

Access Estimator ➔

How is freeze dryer capacity actually defined?

By the fresh product a chamber can load and dry in one batch, not by the weight of finished product that comes out. Most of what leaves is water, so a 500 kg batch of high-moisture fruit finishes at a small fraction of that. Sizing on the finished figure is the most common way buyers end up short.

How long does one freeze drying batch take?

It depends on the product and the cut, and it has to be established by trial rather than assumed. Published modelling puts primary drying alone anywhere from 5 to 40 hours, the short end for stable products on optimised cycles and the long end for heat-sensitive products run conservatively, and primary drying is where about two thirds of the running cost sits.[2] Your own figure is the one that decides annual output.

How do I turn batch size into monthly or annual output?

Divide 24 by your cycle time in hours to get batches per day, multiply by batch weight for daily fresh input, then multiply by operating days. Subtract the water fraction to reach finished weight. The Batch to Annual Output Converter does it for you.

What is the difference between a commercial freeze dryer and an industrial one?

A commercial freeze dryer is a cabinet sized for a small business, loaded by hand and plugged into a single-phase supply. An industrial machine is built around a specified water load, uses trolley loading, and needs a three-phase supply and a utility plan. Cross-shopping the two is common and it is the fastest route to buying the wrong tier.

How much does an industrial freeze dryer cost?

We quote against your configuration rather than publishing a price, because chamber size, condenser duty, heating method and project scope move the number more than anything else. As an external reference point, Google’s own AI overview for this category in August 2026 placed mid-size commercial units around 13,500 USD and large factory systems above 65,000 USD. Those are third-party figures for the market, not a Shengtu quotation.

What power supply and site preparation does the machine need?

Plan for a three-phase supply, cooling water, and a steam supply if you choose steam heating. Ceiling height for the chamber plus lifting clearance above it. Floor loading confirmed by your structural engineer. Clear run-out space in front of the door for trolleys. Your sanitary and washdown requirements, which change how the chamber interior and the trolleys are detailed. We issue the requirement sheet before delivery so your contractor can work to it.

Is freeze drying worth the cost compared with hot air drying?

Only where the product’s price supports it. A freeze dryer vs dehydrator decision comes down to whether your selling price carries the difference: freeze drying holds shape, colour, aroma and nutrition and reaches a lower residual moisture, and it costs more per kilogram of water removed to do it. Hot air drying remains the rational choice for commodity lines.

What residual moisture can freeze drying reach?

Low enough for ambient storage, though the food safety case still has to be assessed on its own rather than assumed from the moisture figure.[5] Peer-reviewed measurements of freeze dried foods report water content between 0.01 and 0.1 g per gram of dry matter, with water activity between 0.08 and 0.33.[1] Your own specification, and the shelf life you have to prove, set the target we size the secondary drying stage against.

What is included in installation and commissioning?

Our engineers travel to your site to direct installation, complete commissioning and train your operators. You supply lifting gear, tools and skilled trades on site. Travel and accommodation for the commissioning team are quoted as a separate line so there is no surprise on the final invoice.

What does the warranty cover and what is excluded?

Equipment carries 12 months from delivery on manufacturing defects in mechanical components. Electrical components and normal wear parts are excluded. Buyers on public forums consistently report that vacuum pumps and control systems are where problems show up first, so it is worth agreeing the spare parts list at order rather than after a stoppage.