Last updated on October 28th, 2026 at 07:28 am
A cassava pressing machine determines how quickly grated mash becomes garri, flour, or starch cake, because wet mash cannot roast or dry properly. Choosing between screw, hydraulic, and motorized presses depends on your volume, budget, and the product you sell.
Every family in Ngwa that makes garri relies on a hand-turned screw press.
My household uses a small one that holds a single big bag, because our garri feeds the family rather than the market.
Commercial garri producers in the same community use bigger presses that squeeze four or five big bags at once.
This guide explains the press designs you will meet, from twin-screw frames to hydraulic jacks and motorized screws.
It also shares what research says about moisture and pressing time, plus a buying checklist and simple maintenance habits.
Table of Contents
What a Cassava Pressing Machine Does
Grated cassava comes off the grater as a sloppy mash, and most of that water must leave before roasting or drying can begin.
In one IITA trial, mash entered a dewatering machine at 68 percent moisture and left at 47 to 52 percent, according to Tropentag proceedings.
The researchers judged that result good enough for high-quality cassava flour, which then dries much faster in a flash dryer or oven.
Pressing also matters for garri quality, because the Codex code of practice on hydrocyanic acid warns that incomplete pressing causes lumps during roasting.
The same code says pressing is complete only when water stops dripping from the sacks.
The mash usually arrives from a grater, covered in our guide to the cassava grinding machine and its six common types.
Types of Cassava Presses
Press designs range from village frames turned by hand to factory machines that dewater mash continuously.
| Press type | How pressure is applied | Typical user | Main strength |
|---|---|---|---|
| Single-screw press | One central screw turned by a long handle | Households and small groups | Simple and durable |
| Twin-screw press | Two screws at both ends turned together | Households and commercial garri makers | Even pressure across the bag |
| Hydraulic jack press | A hydraulic jack pushes a plate down | Small and medium processors | Fast, strong squeeze |
| Motorized screw press | A powered screw pushes mash against back pressure | HQCF and starch lines | Continuous dewatering |
| Rope, stick, or weights | Tied poles or heavy objects on the sack | Remote households | Costs almost nothing |
Single-Screw Press
This design has one big screw at the center of a strong frame, turned down onto the bag with a long handle.
It is one of the two designs used in my community, and the smallest versions hold just one big bag of mash.
Twin-Screw Press
The second design in our village has two long screws at both ends of the frame, which you tighten at the same time.
Turning both screws together spreads pressure across the platform, and the larger frames used commercially hold four or five big bags.
Hydraulic Jack Press
A hydraulic jack replaces the screw, pushing a pressure plate down onto bagged mash with far less effort from the operator.
Researchers comparing dewatering methods found a hydraulic jack in a cylindrical tank produced the driest cake fastest, as detailed below.
Motorized Screw Press
Larger flour and starch lines feed mash continuously into a powered screw that pushes it against a spring-loaded outlet.
These machines suit high quality cassava flour production, where steady output matters more than a low purchase price.
Rope, Stick, or Weights
The oldest methods tie the sack between poles or pile heavy objects on top, then wait for gravity and time to work.
They cost almost nothing, but they are slow and leave wetter mash than a proper press.
What Research Shows About Pressing Methods
A 2011 IITA study compared screw bolts, a hydraulic jack press, and the rope and stick method for dewatering cassava mash.
The best combination, a cylindrical tank with a hydraulic jack, produced cake at 44 percent moisture in the shortest time, the study reports.
A follow-up study tested a motorized screw press at speeds from 20 to 100 revolutions per minute with spring back pressure.
Running at 40 to 50 revolutions per minute with 200 newtons of back pressure gave mash averaging 52 percent moisture, according to the IITA record.
Those numbers give buyers a benchmark, so ask any seller what moisture level their press achieves and how long it takes.
How Long to Leave Mash Under the Press
My family leaves each bag under the screw press for a full day, then breaks the lumps and sieves before roasting.
Codex also recommends letting garri mash ferment for at least two days, since shorter fermentation leaves less time for cyanide breakdown.
In practice, bagged mash keeps fermenting while it sits under the press, so the two steps overlap.
The full garri journey, from fermentation to roasting, is explained in our garri production guide.
Our walkthrough of traditional cassava processing methods shows how pressing fits alongside akpu, abacha, and starch making.
Choosing the Right Press Size
Match press capacity to the number of bags you produce each day, rather than buying the biggest frame a fabricator offers.
- Family garri: a one-bag single-screw or twin-screw press handles household volumes, which is what my family uses.
- Commercial garri: a large twin-screw frame holding four or five bags keeps pace with daily production for local markets.
- Faster turnaround: a hydraulic jack press dewaters quickly when you need to roast or dry the same day.
- Flour and starch lines: a motorized screw press supplies steady, low-moisture cake to flash dryers and mills.
Local fabricators in my area recently quoted about ₦300,000 for a press, as noted in my cassava flour business breakdown.
Buying Checklist
Inspect any press in person, and ask the seller to press a bag of your own mash before you pay.
- Thick, clean threads: screws should turn smoothly under load without wobbling, slipping, or grinding metal.
- Rigid frame: welded steel should not bend or twist when the screws are fully tightened on a heavy load.
- Food-safe pressing surfaces: the platform and plate touching sacks should resist rust from acidic cassava liquid.
- Good drainage: pressed water needs a clear channel away from the frame, so it does not pool under the bags.
- Long handle: extra handle length gives more leverage, which matters when one person presses alone.
Our tips for checking cassava equipment suppliers help you confirm a fabricator before handing over a deposit.
Maintenance and Hygiene
Wash the platform, plate, and frame after each use, because leftover liquid sours quickly and draws flies.
Grease the screw threads regularly, but keep grease well away from the pressing plate and the bags of mash.
Replace torn or worn sacks promptly, since holes let mash squeeze out and contaminate the press water.
Channel the sour press water into a pit away from homes and wells, as our guide to cassava wastewater management recommends.
Conclusion
A cassava pressing machine turns sloppy grated mash into cake ready for roasting or drying.
Single-screw and twin-screw presses serve households and garri makers, while hydraulic and motorized presses suit faster or larger operations.
Research shows good pressing brings mash down to 44 to 52 percent moisture, and Codex advises pressing until dripping stops.
Match the press to your daily bags, test it with your own mash, and keep it clean daily.
If you need practical advice on choosing a press, contact Cassava Pathway through this website, WhatsApp, or X.
Frequently Asked Questions
What does a cassava pressing machine do?
It squeezes water from grated cassava mash, so the cake can be sieved and roasted. Good pressing also prevents lumps during roasting and improves garri quality and yield.
How long should grated cassava stay under the press?
Press until water stops dripping from the sacks, which is what the Codex advises. My family leaves each bag pressed for a day before breaking lumps and sieving.
Which is better, a screw press or a hydraulic press?
Hydraulic jack presses produced the driest cake fastest in IITA dewatering trials. Hand-turned screw presses cost less, need no hydraulics, and remain common in Nigerian villages like mine.
How much does a cassava press cost in Nigeria?
Local fabricators in my area quoted me about ₦300,000 for a garri press. Larger twin-screw frames, hydraulic presses, and motorized screw presses cost more, so compare several quotes.
Chimeremeze Emeh is a tropical crop farmer and chemical engineer from Ntigha, Isiala Ngwa North LGA, Abia State, Eastern Nigeria, specializing in cassava and palm oil, with over 30 years of hands-on experience growing, harvesting, and processing cassava. He grows TMS series, TME 419, and local traditional varieties on his own farms and operates a small-scale cassava flour and starch production business through Cassava Pathway, which he founded as a CAMA-registered agribusiness in 2024. He is also the founder of Palm Oil Pathway, where he applies the same tropical farming expertise. His farms are located in Ntigha, Abia State.