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Dry Pet Food

Pet Food

Pet food is a growing market, the amount of demand increases almost every year. IDAH offers a complete solution for pet food production from the material intake up until the packaging. Every machine is carefully and precisely manufactured to provide a high-quality machine for feed and food production.
Idah has a patented contra-twin shaft extruder that utilizes a combination of steam and mechanical energy from the screw, generating lower SME during production. In Pet food system, IDAH incorporate the carousel dryer which can precisely control temperature, producing uniform moisture with quick product change-over

Contra twin extruder for pet food

Raw Material

The raw material consists of coarse and powdery material

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Optional step for coarse material.
Pre-grinding will lower the energy needed for ultra-fine grinding.

Daily Tank Storage

In general, the production line will utilize 12 raw material bins.
Every bin will be filled with around 5-6 batches of material.

Dosing and Weighing

The material will be dosed based on the formula.
In the pet food line, usually, the material will be processed by batch.


Post-grinding is the final size reduction in the system.
It is common to use a pulverizer for producing ultra-fine powder.

Dry mixing

In this step, trace ingredients such as vitamins and minerals will be added and mixed.


Extrusion starts with pre-conditioning and hydrating by adding steam and water or other liquid.
The material will undergo high pressure, high temperature, and shearing in the barrel, and then be formed by mold at the outlet.


Drying in extrusion is a must, wet pellets will enter the dryer and come out as dry pellets.
No matter horizontal or vertical dryer, good moisture control is the most important feature that a dryer needs.

Coating (optional)

It is common to coat the pellets with oil or enzymes to increase the nutrient value of the pellets.
Depending on the liquid coating level, drum coater or vacuum coater can be used.


Cooling utilizes ambient air to cool down the hot pellet from the dryer.
Thorough cooling is needed to prevent condensation inside the packaging.


Packing gives protection to the pellets and also give easiness to handle and transport to customer's hand


Extrusion process description for pet food

Raw material intake system consisting of tip hopper, mechanical conveyors, and elevators into storage bins. Raw material such as soybean meal, corn, fish meal, and other grain or powder is sieved to remove any impurity and metals.
Pre-grind systems are a size reduction process for raw materials that contain large particulates or grains by hammer mills. Pre-ground material is conveyed to storage bins.
Storage bins are used for the temporary storage of raw materials.
Formula batch dosing system weighing hoppers to proportionally weigh dry ingredients by batches based on every formulation.
The first mixing system is used for dry material mixing to stabilize the following process.
Pulverizer grinding is the second grinding process that grinds the formulation into finer powder with fineness up to 80 mesh 95% pass. This step becomes optional when making big extrudates with sizes of 2.5 mm and up.
Second mixing system Other sources like pre-mix, liquid, oil, and fat are now added and mixed with raw material. Too much fat added here will affect the floatability, so a post-extrusion oil coater will be used to account for the total fat content required.
Extrusion cooking with pre-conditioning The mixer feeds down through a feed hopper into the feed screws which continuously feed the ingredients into a differential diameter conditioner (DDC). Water, steam, and/or oil are added in DDC, the retention time inside DDC is controlled by shaft speed. Two types of extrusion technology can be chosen: single screw extruder or ContraTwin screw extruder.
Drying The dryer will lower the moisture content of the extrudate from 20% to 28% in the dryer inlet down to 10-12%. This drying is needed to lower the water activity and achieve shelf-stable moisture for the products.

Oil coating is needed to increase the nutritional value and palatability of the feed. Depend on the fat content that needs to be added, a drum coater or A vacuum coater can be chosen.


Cooler lowers the temperature of the hot pellets to +3°C of room temperature by utilizing ambient air.

Impurity and dust sieve

All pellets will go through a vibration sieve to remove any irregular pellets or impurity before bagging.

Bagging and sealing system

Weighing cell and bagging machines bag pellets with chosen quantity ex: 20 Kg. or 25 Kg. per bag and seal the bags for storage. Finished products can also be loaded by trucks or in container bags.

Pet food colorful

Features and Benefits of IDAH Process Design and Equipment

IDAH firmly believes in a strategy of design fit for purpose. We recognize the constraints our customers face with rising ingredient costs, energy costs, and overheads costs, yet in the face of these challenges, it is still expected that high-quality products be supplied into a very competitive market. Our design philosophy is to work continuously to refine and improve processes and equipment to maximize the success of our customers. The following describes some of the features and benefits resulting from this philosophy.

Rugged 24/7 Design

We design our equipment for continuous operations and fulfill the expectation for minimal downtime. Our mission is to see our equipment still working years after installation, with only maintenance required being routine maintenance caused by normal fair wear and tear.


Two perspectives are influencing the formulation: culturing performances and efficiency of the machinery. For example, choose the right starch source (types of flour) is essential. Inappropriate starch sources will lower the steam incorporation level and causes jams at the pellet mills. Fat and moisture content play inseparable roles in the hammer mill and pulverizer throughput. Formulation with high fiber content not only increases the risk of broken pellets, lowering the water stability of the pellets. High fiber content also increases the wear of all machinery in the process. Reducing the use-life of the parts such as the hammers, screens, and dies.


We offer a range of mixers, depending on customer needs and preferences. Our mixers are all of the very rugged design and we continue to develop new features, such as geared shaft drives on our twin shaft mixers, which reduce noise, energy costs, and maintenance costs.

Two-Stage Grinding and Pulverizing

We firmly believe in the benefit of even particle reduction to ultra-fine powder. The typical target is to reach more than 95% passing through a 60 mesh screen. It is impossible to efficiently produce small-size products with size 2.0 mm and below without this ultra-fine grind process. Ultra-fine grinding will increase production efficiency and end product quality during the production of larger-size products. It will also open the possibility to utilize less expensive starchy ingredients.
IDAH understands that many production practitioners might worry about the extra energy cost of utilizing a pulverizer, which is why we designed a revolutionary pulverizer that runs at much lower energy costs. The ability to substitute with cheaper ingredients cost will compensate for the small extra energy requirement of the pulverizer. The ultra-fine raw material will produce a smooth, shiny, and water-stable product.


The independent drive on each shaft of the IDAH twin shaft lowers power consumption and noise. The paddles' reverse rotation allows completely emptying the chamber. The misting steam and water injectors further improve conditioner performance. The following conditioner system used steam jacketed (or heat jacketed) to create a homogenous mix with little to no free water. Insufficient pre-conditioning will cause cracks on the pellet surface and creating dust fines.

ContraTwin screw extrusion with pre-conditioning

The ContraTwin screw extruder is a guaranteed solution to increase product quality standards, with lower energy costs and wear costs. This extruder is suitable for processing high fiber formulations. Our machines typically make high-quality pet food and aqua feeds with specific mechanical energies of 25kWh/tonne or lower. The very positive conveying action inside these machines allows us to run high fiber and small diameter products at rates others find difficult to believe.


IDAH offers the carousel dryer T-series and the horizontal dryer CDX-series for your drying solution.
When choosing the correct dryer for your application, moisture control should be one of the most critical selection criteria. Moisture has a direct impact on your product quality, production cost, and profits in your business. One aspect of moisture control is uniformity, together with drying result consistency–in-time will determine the target average moisture content. The closer the average moisture to the maximum moisture levels, then the less raw material is lost through over-drying, generating more profit for your company.


The counterflow cooler is used for cooling pellet and extrudate. Warm (hot) pellets get into the cooling chamber, the suction fan will transport out the air inside the chamber, and fresh ambient air will enter the chamber from the bottom, promoting pellet cooling action. When pellets are accumulated and touch the high-level limit sensor, a pneumatic discharge swivel valve will operate immediately to discharge the products. Counterflow air heat exchange ensures to achieve high cooling efficiency.


In food and feed production, many kinds of ingredients with different properties are used. IDAH provides a high-efficiency mixer for mixing powder and liquid material depending on the formulation requirement. In many foods and feed production, additional liquid may be applied for improving the quality nutritional value, and palatability. IDAH mixing and coating ensured precise mixing for producing a high-quality product.

Specification of ContraTwin screw extruders (for Pet food)

Model EP-76D EP-156D EP-156DL EP-190D
Main Motor (HP) 150 250 350 450
Capacity1 (t/h) 1.0-2.0 5.0-7.0 5.0-8.0 8.0-12.0


2) pet food, plate die hole size Ø 4.0 - 10.0 mm


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