How to Clean a Dog Food Pellet Machine with Food-Grade Agents

Why Cleaning Agents Must Be Food-Grade

Pet food is consumed directly by animals, and any chemical left on the machine surface after cleaning can be carried into the next batch. This is why only food-grade cleaning agents may be used on a dog food pellet machine. Industrial or ordinary household cleaners contain chemicals that can harm animal health if residues remain, so they must never be used. Food-grade cleaning agents suitable for dry dog food making machines fall into three categories: neutral cleaners for daily grease removal, alkaline cleaners for burnt and protein residue, and disinfectants for the final sanitation step. The right choice depends on the cleaning need, and each category has its own dilution and application rules.

Neutral Cleaners for Daily Cleaning

Food-grade neutral cleaners with a pH of around 7 are gentle and non-irritating, and they are suitable for daily cleaning of grease and general residues, such as food-grade neutral dishwashing liquid and neutral cleaning powder. They are non-corrosive to parts such as the screw and die of the extruder, effectively remove surface grease, and rinse away without leaving residue, which makes them the first choice for daily cleaning. For use, dilute with warm water at a ratio of about 1:50, apply the solution to the surface of the part to be cleaned, scrub with a soft brush, and then rinse with clean water.

Alkaline Cleaners for Burnt and Protein Residue

Food-grade alkaline cleaners with a pH of 8-10 are suitable for removing stubborn burnt residue and protein residue from dog food manufacturing equipment, such as food-grade sodium hydroxide solution and alkaline cleaning paste. These cleaners break down the organic matter in burnt residue and soften stubborn stains, but the concentration and the application time must be controlled to avoid corroding equipment parts. For stubborn burnt residue on the extruder, dilute at a ratio of about 1:100, soak the parts for 15-20 minutes, clean with a scraper, and rinse thoroughly with clean water. Do not apply the undiluted cleaner directly to the precision apertures of the die head; dilute it first and brush gently with a soft brush.

Disinfectants for Deep Cleaning

The third category, food-grade disinfectants, is used for disinfection and sterilization after deep cleaning, such as food-grade hydrogen peroxide disinfectant and sodium hypochlorite disinfectant. These agents kill bacteria and mold on the equipment surface and ensure production safety, and they must be used after cleaning rather than instead of it. For use, dilute according to the product instructions, spray the solution onto the extrusion chamber, feed hopper, and discharge port, let it stand for 5-10 minutes, then rinse thoroughly with clean water and dry completely so that no disinfectant residue remains.

Safety Rules for Using Cleaning Agents

Follow five safety rules. First, strictly use food-grade cleaning agents only. Second, control the concentration: too high a concentration leaves residue and may corrode parts, while too low a concentration cleans poorly, so follow the dilution instructions exactly. Third, rinse thoroughly after cleaning, especially the screw, extrusion chamber, and die; rinse repeatedly with clean water 3-5 times to ensure no cleaning agent remains. Fourth, ensure thorough drying after disinfection, because undried disinfectant residue can react with raw materials and affect dog food quality. Fifth, store cleaning agents in sealed containers in a dry, well-ventilated place, away from raw materials and production areas, and never mix different types of cleaning agents; for example, mixing acidic and alkaline cleaners can produce toxic gases that are harmful to health.

FAQ

Why can only food-grade cleaning agents be used?

Residues of industrial or household cleaners can be carried into the next batch and harm animal health, so only food-grade agents, which are safe for food contact, may be used.

What dilution ratio is used for neutral cleaners?

Neutral cleaners are typically diluted with warm water at about 1:50 for daily cleaning; follow the product instructions for the exact ratio.

How are stubborn burnt residues removed?

Use a food-grade alkaline cleaner diluted at about 1:100, soak the parts for 15-20 minutes, clean with a scraper, and rinse thoroughly with clean water.

How many times should the machine be rinsed?

Rinse repeatedly with clean water 3-5 times, especially the screw, extrusion chamber, and die, to ensure no cleaning agent residue remains.

Why must different cleaners never be mixed?

Mixing acidic and alkaline cleaners can produce toxic gases, and mixing other chemicals can create harmful reactions, so cleaning agents should be stored and used separately.