Corn puffs start with milled corn, but their light texture comes from how that corn is cooked and shaped. The familiar packaged curls and balls are usually made with an extruder, rather than by popping whole corn kernels.
For direct-expanded corn puffs, an extruder mixes and cooks cornmeal or corn grits with water under pressure. When the hot mixture leaves a shaped opening called a die, the pressure drops and some of the water turns to steam. This expands the mixture into a puff. The pieces are cut, dried and seasoned before packaging.
The details vary with the recipe and equipment. The six stages below explain a direct-expanded snack line; they aren’t a formula for every product sold as a corn puff.
The 6-Step Manufacturing Process Of Corn Puffs
Cornmeal or corn grits provide the base, but a manufacturer may also use other grains, oil and seasonings. For example, some packaged puffs contain both cornmeal and rice flour.
An extruder has a barrel with one or more rotating screws. As NC State Extension explains, this equipment can cook ingredients and force them through a die to form different shapes. How the ingredients, moisture and equipment are controlled affects the final texture.
1. Preparing the ingredients.
The manufacturer measures the cornmeal or grits and any other ingredients for the recipe. Water is added in a controlled amount before or during extrusion.
Inside the extruder, the screws move and mix the ingredients. Heat and mechanical action cook the mixture, including its starch. The material hasn’t yet become the finished airy snack.
2. Puffing the cornmeal mix to make corn puffs.
The cooked mixture is forced through the die at the end of the extruder. Its shape helps determine the shape of the snack.
As the mixture comes out, the pressure drops. Some of its water rapidly turns to steam, expanding the cooked starch into a porous puff. This sequence is documented in Massey University research on extruded corn snacks. The puff forms as the material leaves the die, rather than being shaped into a finished puff beforehand.
3. Cutting the corn puffs into size.
A rotating blade can cut the material as it emerges from the die. The die shape and the cutting arrangement work together to determine the pieces.
For example, Baker Perkins describes equipment for balls, curls and rings, as well as more complex shapes. Manufacturers choose the equipment and settings for the particular snack they want to make.
Recommended: Do You Need To Refrigerate Corn Tortillas? | Does A Cornbread Have Corn? | Where Do Granny Smith Apples Grow?
4. Drying the corn puffs.
The cut pieces may then pass through a dryer to remove more moisture and develop their crisp texture. Baker Perkins describes a direct-expanded line in which drying comes before seasoning.
That order is an example of a production line, rather than a rule for every extruded snack. Other products and equipment can use different finishing steps.
5. Adding flavors to the corn puffs.
Seasoning can involve liquids, dry powders, or both. A Heat and Control coating system, for example, sprays measured liquids and distributes dry seasoning while the snacks tumble in a drum.
Oil can be part of the coating, and cheese-flavored products can contain milk ingredients. The coating doesn’t always form a hard crust, and there isn’t one setting time that applies to every flavor.
6. Packaging corn puffs.
After the required finishing and cooling steps, the snacks are weighed into portions and packed into sealed bags.
One type of packaging machine forms a bag from a roll of film. Rovema describes its vertical bagmaker forming the film into a tube, sealing it, filling it with product, and cutting and sealing the individual bags. The packaging material and equipment depend on the product.
What Ingredients Can Corn Puffs Contain?
A puffed texture doesn’t tell you whether a snack contains oil, milk or artificial flavors. Extrusion is a processing method, not an ingredient or nutrition guarantee.
For example, the Canadian Cheetos Puffs Cheese Flavoured Snacks label lists vegetable oil, milk ingredients, and natural and artificial flavors. The U.S. Pirate’s Booty Aged White Cheddar Rice & Corn Puffs label says the product is baked rather than fried, but still lists canola oil and milk ingredients.
These are product-specific examples, not the ingredients of every corn puff. Formulas can vary by flavor and country, so check the package that you are buying.
- Read the ingredient and allergen information if you need to avoid milk or another ingredient.
- If you follow a vegetarian or vegan diet, check the product’s specific ingredients and labeling rather than assuming that a corn-based snack meets your needs.
- Compare the nutrition information using the same amount of each snack. A baked or puffed product is not automatically lower in fat or calories than another snack.
Can You Make Corn Puffs At Home?
You can make corn snacks at home, but a corn-kernel batter cooked in oil is a different type of food from a direct-expanded corn puff. A household frying method doesn’t reproduce the cooking, pressure and shaping stages of an industrial extruder.
For example, King Arthur Baking calls its corn-filled batter cooked in oil corn fritters. If that is what you want to make, use a complete fritter recipe with its ingredient quantities and cooking instructions. Don’t expect it to have the same texture as a bag of extruded corn puffs.
Related: Does A Baking Pan Has Teflon? | Does A Copper Pan Has Teflon?
How Are Corn Puffs Different From Popcorn?
Popcorn starts with intact popcorn kernels. As Purdue University explains, moisture inside the heated kernel creates pressure until its outer covering ruptures and the starch expands.
Direct-expanded corn puffs start with milled corn and water. The extruder cooks this mixture, and the pressure change at its outlet produces the expansion. So these puffs are not made from kernels that have already been popped.
Both snacks can have added oil, salt and flavorings. Their ingredients, serving sizes and nutrition labels give you a better basis for comparison than their names or how light they feel.
