ISO Certified Quality

Extrusion Equipment

Food Extruder Machines, Twin-Screw Extrusion Equipment for Snack, Pet Food, Cereal and Aqua Feed Lines

Shengtu builds twin-screw food extruders and the stations around them, from the mixer at the front to the packer at the end. Tell us the product and the kilograms per hour, and an engineer sizes the machine against your recipe rather than against a catalogue.

  • Four models, 100–500 kg/h
  • Build in 30–40 working days
  • 30% T/T deposit
  • One set is the order minimum
Your recipe, product photographs and target output stay between you and our engineering team. We don’t publish or reuse customer formulations.
Extrusion Equipment Main Component
Twin-Screw Extrusion Detail
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100–500

Kg/h Output Range

30–40

Days Build Time

100%

Recipe Engineered

ISO

Certified Equipment

Extrusion Capability at a Glance

Extrusion Capability at a Glance

A food extruder is a twin-screw machine that mixes, cooks and shapes food or feed in one continuous pass, and Shengtu builds four of them, from 100 to 500 kg/h. Cooking happens in the screw through shear and pressure, shape comes from the die, and length comes from the cutter.

100–500 kg/h

Four twin-screw models. The LY65 covers pilot and small-plant volumes, the LY85 covers full production.

65 mm to 85 mm screws

Twin intermeshing screws in 65, 70, 75 and 85 mm, with screw lengths from 1,050 mm to 2,150 mm.

22–75 kW main drive

Inverter-controlled on the LY65, LY70 and LY85. Barrel heating is zoned, 10–26.4 kW depending on model.

food-grade 304 stainless steel

Machine construction throughout, the grade the food-contact metal regimes are written around, from FDA 21 CFR Part 177 to GB 4806.9.5

five pre-shipment tests

No-load run, loaded simulation, temperature-control stability, core-component inspection and full-line linkage, on every machine.

2-year warranty

With a 1-hour first reply, a 3-hour preliminary solution and 72-hour engineer dispatch after that.

Nine stations

Mixing, feeding, preconditioning, extrusion, cutting, drying, seasoning, cooling and packing, supplied as one line or as single machines.

Recipes designed with you

We set the formula and extrusion parameters with you and tune them again during commissioning.

The Extrusion Line, Station by Station

An extruder on its own makes a shape. A line makes a product. These are the nine stations we build and integrate, in the order material moves through them.

Mixing and automatic feeding

Dry ingredients are blended and then metered into the extruder at a controlled rate. Feeding runs on its own inverter-controlled drive, 0.75 kW on the LY65 and LY70 and up to 2.2 kW on the LY75, so feed rate can be trimmed without touching screw speed.

Anti-bridging geometry in the hopper matters more than feeder power. A hopper that bridges starves the barrel, and a starved barrel reads on the panel as a screw speed problem when it’s a powder-flow problem.

Preconditioning, and when you can skip it

Preconditioning adds steam and water to the dry mix in a paddle chamber before the material reaches the screw. NC State Extension puts the mixing time at two to four minutes and describes the effect plainly: the raw material moves from a glassy state to a rubbery one, starch begins to gelatinise, and the extruder then needs less mechanical energy to finish the job.1

There’s a threshold worth knowing before you pay for the station. Below roughly 18% process moisture, preconditioning can be left out, and low-moisture highly expanded products such as corn puffs are the classic case.1 Above 18–20% moisture, leaving it out means raising barrel temperature, shear or the length-to-diameter ratio to reach the same cook, and that route brings dextrinisation and scorching with it.1

Two operating details from the same source save recurring trouble. Oil and other liquid additions go in near the discharge end, because oil added early coats the particles and blocks water uptake. Meat slurry has to be metered accurately, because clumps show up downstream as surging and out-of-spec pieces.1

Twin-screw extrusion

Two intermeshing, co-rotating screws convey, mix and cook in the same barrel. Cooking energy arrives two ways: mechanically, through shear from the screws, and thermally, through the zoned barrel heaters. Mechanical energy from the screws is what the industry calls specific mechanical energy.

In twin-screw practice the working length is made up of screw elements whose pitch and profile decide where the material is conveyed, where it’s mixed and where pressure builds. The Wenger patent describes exactly this, a disrupting and homogenising section built from alternating right-hand and left-hand pitch parts.2 Torque, not rated power alone, is what the gearbox has to deliver into that geometry.

Nothing about that concept is ours. A Wenger Manufacturing patent on mid-barrel restriction defines high specific mechanical energy extrusion as a single or twin extruder with an upstream preconditioner, and reports run values between 45 and 60 kW·h per tonne.2 That’s the mechanical component alone, and it’s the number a process engineer optimises through the whole extrusion process.

Cutting and forming

A variable-speed face cutter sets piece length at the die. Cutter drives are inverter-controlled at 0.75 kW on the smaller models and 1.5 kW on the LY85. Shape comes from the die plate, so a new product usually means new tooling rather than a new machine.

Hot-air drying

Multi-layer hot-air drying brings moisture down to a storable level after expansion. This station is the one most often undersized, and a dryer that can’t keep up caps the whole line no matter what the extruder nameplate says.

Seasoning, oil spraying and cooling

A rotating drum applies oil and seasoning powder; a cooling section brings the product to packing temperature so it doesn’t sweat inside the bag. Both stations are optional in the strict sense and decisive in the commercial sense, because they’re where flavour consistency is won or lost.

Automatic packing

Weighing and bagging closes the line. We supply it as part of a turnkey scope or leave the interface open if you already run a packer.

The Extrusion Line Station by Station - UDTECH

Raw Materials and Recipes This Line Runs

Extrusion is a formulation process before it’s a machine process. These are the material families the line is built to handle, with the property that governs how each behaves in the barrel.

Raw Materials and Recipes This Line Runs
Material family Behaviour in the barrel Products it makes
Corn grits and corn flour High starch, expands readily at low moisture Corn puffs, curls, extruded snack sticks
Rice flour Fine texture, clean colour, low fat Rice-based crisps, gluten-free snacks
Wheat flour and semolina Gluten network gives cohesion rather than expansion Pasta pre-forms, snack pellets, bread crumb
Corn and wheat starch Pure starch, gelatinises fast under shear Modified starch, binder, pellet snacks
Oat and barley flour Higher fibre, lower expansion, needs more moisture Breakfast cereal, high-fibre extruded products
Bran and cereal fibre Abrasive, raises wear on screws and dies Fibre-enriched cereal and snacks
Material family Behaviour in the barrel Products it makes
Soya protein and defatted soy flour Protein texturises under shear and moisture Textured vegetable protein, soy chunks, meat extenders
Pea and blended plant protein Fibre alignment depends on shear history Plant-based meat pre-forms
Meat meal and poultry meal Fat content raises lubricity and lowers shear Dry pet food kibble, treats
Fish meal Needs controlled temperature to protect nutrients Floating and sinking aqua feed
Fresh meat slurry Added at the preconditioner, must be metered accurately High-meat-content pet food
Functional additives, vitamins and colours Heat-sensitive, usually dosed after the die or in the coater Fortified cereal, functional snacks, nutritional pet food

Dies, Shapes and Downstream Finishing

Die and finishing train decide what the buyer sees. Repeatability is decided by the extruder.

Round and Hollow Dies

Sticks, tubes, rings and curls. The workhorse geometry for corn and rice snacks.

Shaped Dies

Stars, shells, animal shapes and letters, cut at the face to length.

Kibble Dies

Round, cross, bone and fish shapes for dry pet food and treats.

Aqua Feed Dies

Sized for floating or sinking pellets; density is set by moisture and die pressure, not by the die alone.

Texturised Protein Dies

Slot and cooling-die arrangements for soy chunks and fibrous plant protein.

Hot-Air Drying

Multi-layer circulation with independent temperature control, sized against the extruder’s output rather than against its model number.

Oil Spraying and Seasoning

Rotating drum with metered oil and powder dosing for even coverage at speed.

Cooling

Brings product to packing temperature so moisture does not condense inside the bag.

What the Die Actually Controls

Die geometry and the restriction ahead of it set the pressure the material sees at the exit, and pressure together with moisture is what decides whether an aqua feed pellet floats or sinks. It’s the same variable the Wenger patent manipulates deliberately with a mid-barrel restriction valve to raise specific mechanical energy without adding thermal energy.2

Contrary to the usual sales framing, a wider die isn’t a route to more output. Open more area and pressure falls, expansion falls with it, and the product changes rather than the tonnage. Output belongs to screw speed, feed rate and the drive; shape and density belong to the die.

Drying is the station that most often decides the finished moisture, and NC State Extension’s account of preconditioning is the reason why: material that arrives at the die already hydrated leaves with more water to remove.1 Size the dryer against the extruder’s output, not against its model number.

Tooling is the cheapest way to add a food product. A new die and a cutter setting will usually get you a new shape on the same extruder, which is why we quote dies separately from the machine.

Our line is modular in the same spirit. Take the extruder alone, take it with drying, or take the full train through to packing, and add a station later when a new food products range justifies it. What decides the final product is the combination of recipe, die and process parameters, not any single machine in the row.

Four Models from 100 to 500 kg/h

Every figure in this table comes from our own machine specifications. Where a value isn’t settled, the row is absent rather than estimated.

Specification LY65 LY70 LY75 LY85
Throughput100–150 kg/h200–260 kg/h250–350 kg/h400–500 kg/h
Screw diameter65 mm (2.56 in)70 mm (2.76 in)75 mm (2.95 in)85 mm (3.35 in)
Screw length1,050 mm (41.3 in)1,699 mm (66.9 in)2,150 mm (84.6 in)1,650 mm (65.0 in)
Screw configurationTwin, intermeshingTwin, intermeshingTwin, intermeshingTwin, intermeshing
Main drive22 kW, inverter45 kW, inverter75 kW, 4-pole75 kW, inverter
Feeder drive0.75 kW, inverter0.75 kW, inverter2.2 kW, 4-pole1.5 kW, inverter
Cutter drive0.75 kW, inverter0.75 kW, inverter2.2 kW, 4-pole1.5 kW, inverter
Extrusion Equipment Model Data Table
Specification LY65 LY70 LY75 LY85
Oil-pump drive0.37 kW0.37 kW0.75 kW0.37 kW
Barrel heating10 kW (5 × 2 kW)14 kW (7 × 2 kW)26.4 kW (12 × 2.2 kW)21 kW (7 × 3 kW)
Installed power33.87 kW60.87 kW106.55 kW99.37 kW
Running power25–28 kW33 kW85–90 kW55–65 kW
Supply380 V / 50 Hz380 V / 50 Hz380 V / 50 Hz380 V / 50 Hz
Extrusion Equipment Model Data Table
Model Running power Throughput Total running power per kg
LY6525–28 kW100–150 kg/h0.17–0.28 kWh/kg
LY7033 kW200–260 kg/h0.13–0.17 kWh/kg
LY7585–90 kW250–350 kg/h0.24–0.36 kWh/kg
LY8555–65 kW400–500 kg/h0.11–0.16 kWh/kg
Extrusion Equipment Model Data Table

Reading the Two Energy Numbers in an Extruder Quote

Any extruder quotation can put an energy figure in front of you, and it will be one of two different quantities. One is total running power per kilogram, everything the machine draws at rated output. Other is specific mechanical energy, only the work the screws put into the material. A quote that doesn’t say which one it means has told you nothing.

Divide the running-power row by the throughput row and you get the first number, the one that turns up on an electricity bill. We publish it because a buyer can check it against our own specifications and against their own tariff.

This isn’t specific mechanical energy, and the two shouldn’t be compared. The figures above cover everything the machine draws at rated output: main drive, feeder, cutter, oil pump and barrel heaters. Specific mechanical energy counts only the mechanical work the screws put into the material, and the Wenger patent reports run values of 45 to 60 kW·h per tonne for that quantity.2 A vendor quoting one against the other is comparing different things.

Two things are visible in the table itself. Across the range the LY85 is the most economical per kilogram. The LY75 sits at the other end, and it also carries the most heating zones in the range at 26.4 kW across twelve bands, and the longest screw at 2,150 mm.

Quotation Basis, Payment Terms and Build Time

We don’t publish a price, because an extruder price without a scope is a number with no meaning. We do publish what moves it.

What the quotation is built from

Price follows the capacity tier, the screw and die configuration, how much of the downstream train you take, the level of automation in the control cabinet, and the destination port and packing you need. Two plants buying the same model can sit far apart on price for those reasons alone, and the gap is usually the downstream train rather than the extruder itself, because drying and coating carry more steel and more installed kW than the barrel does. A quotation that hides that split is a risk to you, not a simplification.

Terms

Payment

30% T/T deposit with the balance before shipment; an L/C at sight is also accepted.

Build time

Machine build is scheduled at 30–40 working days from the deposit, confirmed with your quotation.

Order minimum

One set is the order minimum, and one machine can be extended into a full line later.

Export packing

Machines leave the works in fumigation-free wooden cases.

An independent plant-economics study of extruded-snack manufacturing puts raw materials at 65–75% of operating cost and utilities at 10–15%.4 That’s worth holding onto when a vendor tells you their machine will transform your cost base: the machine sits inside the smaller of those two numbers.

× Enlarged Equipment View

Build Quality and Pre-Shipment Testing

Every machine passes five pre-shipment tests before it leaves the works, and none of them is a paperwork exercise.

01 Running the machine empty confirms stable rotation and clean starts and stops across conveying, main drive and control system.
02 Under simulated production conditions, continuously, we watch how it behaves once material is in the barrel.
03 Heating system and control loop are checked for accuracy across the zones.
04 Motor, gearbox, screws and bearings get checked item by item.
05 Everything from infeed to finished product runs as one sequence, not station by station.

Works tests are run in that order because the failure modes stack: a control fault found under load is a different problem from a bearing fault found at rest, and finding them in the wrong sequence means stripping the machine twice. Shengtu runs the loaded simulation before the component inspection for that reason, not for form.

Materials and the standards that govern them

Machines are built in food-grade 304 stainless steel. Rules defining what “food-grade” means for a metal are FDA 21 CFR Part 177 in the United States, Regulation (EC) 1935/2004 in the European Union, and GB 4806.9 in China, which replaced GB 9684-2011 for metallic materials in food application.5 We name the material grade and the regimes it is chosen against, and we leave certification claims to the documents that carry them.

Company certifications

The company holds ISO 9001, ISO 27001 and DCMM Level-2. These are corporate management-system certifications rather than a machinery-safety certificate for any individual model, and we describe them that way on purpose.

Support after the machine is running

Buyers of Chinese equipment describe the same failure pattern in public: thin troubleshooting support, missing documentation, and a time difference that turns a one-hour problem into a three-day problem.6 Our answer has to be a clock, not a promise.

Two of those complaints are about paperwork rather than steel. Documentation that never arrives, and a language barrier that turns a one-hour problem into a three-day problem, are the failures buyers name most often, and neither is fixed by a better machine.

Support runs to a 1-hour first reply, a 3-hour preliminary solution and 72-hour engineer dispatch. Machines carry a 2-year warranty. We keep screws, dies, bearings and control components available for the life of the machine.

From Enquiry to Commissioning

Tell us the product and the output. Product type and target kilograms per hour are enough to start, and recipe detail sharpens the answer.

01 Process Details & Build
02 Matching Output to Model
03 Work It Out Before You Talk
Contact Udtech
01

We check your recipe against screw configuration, die design and process moisture, and say so if a station you asked for isn’t worth its cost.

You get a scoped quotation with a plant layout, so the footprint question is settled before money moves.

Machine build is scheduled at 30–40 working days from the deposit, confirmed with your quotation.

Five pre-shipment tests, then packing in fumigation-free wooden cases.

Commissioning covers plant layout, installation, electrical hook-up, parameter tuning, line linkage and operator training.

Installation is a line item, not an afterthought. Oklahoma State University Extension’s equipment-purchase checklist asks buyers directly whether the supplier can provide competent personnel for installation and at what rates including travel and lodging.7 It’s a fair question and we answer it in the quotation.

02

Matching Output to Model

Start from the product, then the hourly figure. Tiers below follow the way the market actually brackets this equipment.

If Your Target Output Is Start From What Usually Decides It
100–150 kg/h LY65 Pilot lines, new product development, small plants entering a category
200–260 kg/h LY70 The best running power per kilogram in the range at modest scale
250–350 kg/h LY75 The longest screw and the most heating zones, for recipes needing more thermal work
400–500 kg/h LY85 Full production, and the lowest total running power per kilogram in the range

A bigger extruder doesn’t automatically mean a bigger line. Food Safety Magazine states it flatly in its equipment-purchase guidance: if a larger piece of equipment is bought but another piece upstream or downstream can’t accommodate the new flowrate, the goals may not be met, and bigger isn’t always better because too big can challenge the processing system and the increase won’t be fully utilised.8

“Bigger is not always better. Think “Goldilocks and the three bears”—too small may not help with the goals of buying the equipment, but too big can challenge the processing system and the increase will not be fully utilized.”

Janna Hamlett Ph.D., University of Idaho Extension, In Food Safety Magazine

In extrusion the two stations that usually bind are the preconditioner in front and the dryer behind. That’s why our engineering review sizes the line, not the machine.

03

Work It Out Before You Talk to Us

Model and Output Matcher

Enter your product and target kilograms per hour to see which of the four models to start from, and what the line needs around it.

Running Energy Calculator

Enter a model, your running hours and your electricity tariff to get annual energy cost and cost per kilogram.

Line Station Checklist

Answer four questions about your product to see which of the nine stations your line actually needs, including whether preconditioning earns its cost.

Products This Line Makes

Twin-screw extruder, drive end with inverter-controlled main motor.

Zoned barrel heating and the die and cutter assembly at the discharge end.

Extrusion line assembled in the works for the loaded simulation test.

The application spread below is the one the trade press describes for twin-screw work: pasta, textured vegetable protein and oily foods on the twin-screw side, plain kibble work still going to single-screw machines.3

Snack and puffed food

Corn curls, sticks, rings and filled snack shapes from corn grits, rice flour and blends. This is the low-moisture, high-expansion end of the range, and it’s the case where preconditioning can often be left out.

Breakfast cereal and corn flakes

Extruded cereal shapes and flake pre-forms, with the drying and coating train that turns them into a finished cereal.

Pet food and aqua feed

Dry kibble and treats from meal-based recipes, and floating or sinking aqua feed where pellet density is set by moisture and die pressure. High-meat recipes take the meat slurry at the preconditioner.

High-moisture and plant-based protein

Textured vegetable protein, soy chunks and plant-based meat pre-forms, where the fibre structure created in the barrel is the product and must survive everything downstream.

Pasta, bread crumb and starch products

Pasta and macaroni pre-forms, extruded bread crumb, modified starch and fortified rice, all on the same machine family with different tooling.

Functional and fortified products

Vitamin-enriched cereal and nutritional pet food, where heat-sensitive additives are dosed after the die or in the coater rather than into the barrel.

Where this page sits among extruder types

Searches in this category split by application rather than by machine, which is why the same barrel turns up as a pet food extruder, a cereal extruder, a fish feed extruder machine and a puffed food extruder in four different catalogues. Contrary to how those catalogues read, they’re usually the same twin-screw platform with different tooling and a different downstream train.

Buyers comparing food extruder manufacturers often start from an extruder machine for pet food and end up specifying a cereal production line, or the reverse. The principle of extrusion cooking doesn’t change between them; the recipe, the moisture and the die do.

Turnkey scope

Single machines, a single-layer or multi-layer line, semi-automatic or fully automatic, or a whole-plant scope with layout planning. The line covers mixing, feeding, preconditioning, extrusion, cutting, drying, seasoning, cooling and packing.

Where Extrusion Is Not the Right Process

Four cases where we would tell you to buy something else, or to buy less. In practice the honest answer to an enquiry is sometimes a smaller quotation than the one you asked for.
01
One stable recipe, no changes
A twin-screw machine buys you recipe flexibility and costs you capital, and a single-screw machine is not a substitute for it when the recipe changes weekly. On one fixed product the reverse holds: the second screw buys you nothing, a single-screw machine does the job for less, and suppliers across this market say so. Alternative: a single-screw extruder sized to the same output.
02
Wet pet food and retort products
Extrusion cooks and shapes a plastic mass. Canned and pouched wet food is a filling, seaming and sterilising route. Alternative: a retort line, which is a different family of equipment.
03
Heat-sensitive actives in the barrel
Probiotics, some vitamins and delicate colours do not survive barrel conditions. Alternative: dose after the die, in the coater or in the spray step.
04
Buying capacity you cannot feed or dry
A larger extruder in front of an undersized dryer produces a bigger queue, not a bigger output. Alternative: size the constraint station first, then the extruder.

Extrusion Equipment Engineering Tools

Frequently Asked Questions

What is a food extruder and what does it do?

A food extruder forces a mixed, moistened food or feed material through a heated barrel with one or two rotating screws and out through a shaped die. Mixing, cooking and shaping happen in one continuous pass, which is why one machine replaces several batch steps.

What counts as an extruded food?

Any product cooked and shaped in the barrel rather than assembled afterwards: puffed snacks, breakfast cereal, kibble, aqua feed pellets, textured protein and pasta pre-forms are all extruded food in that sense. Extrusion works the same way in each case; recipe, die and parameters are what differ.

What is the difference between a single-screw and a twin-screw food extruder?

A single-screw machine mainly conveys and melts. Twin intermeshing screws add real mixing capability, tolerate wider moisture and fat ranges, and handle recipe changes without retooling the process. The trade-off is capital cost.

How do I choose an extruder for 100 to 500 kg per hour?

Fix the product first, then the hourly output, then check the stations either side of the extruder. Within our range the LY65 starts at 100–150 kg/h and the LY85 covers 400–500 kg/h; the model matcher above walks the same path.

Does a bigger extruder mean a bigger line output?

Not on its own. If the preconditioner in front or the dryer behind can’t take the new flowrate, the extra extruder capacity doesn’t reach the packer.8

What raw materials can this line run?

Corn, rice, wheat and oat flours, starches, bran and cereal fibre, soya and pea protein, meat and fish meal, fresh meat slurry at the preconditioner, and functional additives dosed downstream. The materials table above lists how each behaves in the barrel.

Can one extruder make more than one product?

Yes. That’s the main argument for twin screws.

Can it process fresh meat or high-fat ingredients?

Fresh meat slurry goes in at the preconditioner and has to be metered accurately, because uneven mixing shows up downstream as surging and out-of-spec pieces.1 High fat lowers shear, so screw configuration and moisture are adjusted rather than assumed.

What is extrusion cooking and how is it different from cold forming?

Extrusion cooking gelatinises starch and denatures protein inside the barrel using shear and heat. Cold forming only shapes a mass that has already been cooked or blended upstream. Both need different screws, different temperatures and often different machines.

How much power does the machine actually draw per kilogram?

Between 0.11 and 0.36 kWh per kilogram at rated output across the four models, counting everything the machine draws. That isn’t the same measure as specific mechanical energy, which counts only the screws’ mechanical work and is reported in the range of 45 to 60 kW·h per tonne in the extrusion-patent literature.2

When is preconditioning worth paying for?

Below roughly 18% process moisture it can often be skipped, which is why corn puffs are usually made without it. Above 18–20% moisture it’s what lets the extruder cook properly without being pushed into scorching territory.1

What maintenance does an extrusion line need?

Screws, dies and bearings are the wear path, and barrel heaters and their controls need periodic checking. We keep screws, dies, bearings and control components available for the life of the machine.

What is the difference between a food extruder and a pellet mill?

A pellet mill compresses without cooking. An extruder cooks as it conveys.

What are the downsides of food extrusion?

Heat-sensitive nutrients can be lost in the barrel, the capital cost is higher than batch equipment, and some raw materials don’t suit the process at all. Industry sources note the same limitations, and the section above lists the four cases where we would point you elsewhere.

How long is the build time and what are the payment terms?

Machine build is scheduled at 30–40 working days from the deposit, confirmed with your quotation. Payment is a 30% T/T deposit with the balance before shipment, and an L/C at sight is also accepted.

What is the minimum order and how is the machine packed?

One set is the order minimum, and one machine can be extended into a full line later. Machines leave the works in fumigation-free wooden cases. Packing is sized for sea freight, and the crate travels with the machine documentation, the wear-part set supplied with the order and the layout drawing your installation team will need on the day the crate is opened. If your destination has its own phytosanitary or marking requirements, tell us at order stage and we build them into the crate specification rather than discovering them at the port.