Deodorant Filling Machine

Deodorant aerosol filling has several distinguishing characteristics compared to other aerosol products: (1) High ethanol content — most deodorant body sprays contain 60–80% ethanol, making the product a Class IB flammable liquid (flash point 13–26°C). This means the product supply system, fill nozzle area and product piping are Zone 1 classified, requiring Ex ia electrical components. In contrast, many other aerosol products (paint, lubricant, household) do not have such high flammability in the product formulation itself. (2) Small can size — deodorant cans (50–200ml) are smaller than typical household or industrial aerosol cans. The machine must handle light-weight aluminum cans at high speed without denting or misalignment. (3) Fragrance compatibility — the filling machine seals, hoses and nozzle materials must be compatible with fragrance materials (many are not compatible with standard NBR rubber or PTFE materials). (4) Multiple-SKU production — cosmetic manufacturers typically produce dozens of deodorant variants (fragrance variants, gender variants, size variants) on a single line, requiring fast recipe changeover and stringent cleaning validation between products.

ATEX Zone 2 compliance on a deodorant filling machine is implemented through: (1) electrical equipment selection — all electrical components in the Zone 2 area (fill area, propellant gassing area) are specified to ATEX Category 3G (suitable for Zone 2), protection type Ex ec (increased safety), Ex nA (non-sparking) or Ex d (flameproof enclosure), per IEC 60079-0. Motors, sensors, valves, solenoids and lighting in Zone 2 carry ATEX certification marks. (2) Intrinsically safe circuits — all sensors and control signals in Zone 1 sub-areas (direct fill nozzle zone) use Ex ia (intrinsically safe) devices with ATEX Zone 1 certification (Category 2G). (3) Earthing and bonding — all conductive parts of the machine are bonded to a common earth, preventing electrostatic discharge. Can holders have conductive contact points and earth continuity is verified at each can position. (4) LEL monitoring — continuous LEL monitors in Zone 2 areas connected to the PLC; at 20% LEL, the system alerts; at 40% LEL, production automatically stops and ventilation increases to emergency mode.

The propellant choice for deodorant aerosols depends on the desired spray characteristics and formulation type: LPG (Propane/Butane) is the most common propellant for deodorant body sprays — it provides a fine, wet mist spray suitable for deodorant body coverage. Typical LPG charge for a 200ml deodorant: 30–40g LPG (approximately 40–50% of total can weight). N₂O (Nitrous Oxide) or N₂O/LPG blend: used for antiperspirant aerosols where a softer, drier spray is desired. N₂O is a compressed gas (not liquefied), providing softer spray pressure at lower propellant concentrations. CO₂/N₂O blends: used in deodorant aerosols targeting reduced carbon footprint (lower LPG content). The filling machine must be configured for the propellant type: LPG uses UTC (under-the-cup) or TTV (through the valve) gassing at low temperature; N₂O uses TTV gassing at ambient temperature.

Cleaning validation between different deodorant fragrances is required to prevent cross-contamination (fragrance carry-over from one SKU to the next). The validation approach depends on the fragrance tolerance level: (1) Same fragrance family (e.g., fresh citrus to different fresh citrus) — a water rinse followed by a product flush (first 20 fills discarded) may be acceptable; a TOC (Total Organic Carbon) swab test confirms residue is below the acceptance criterion (typically <10 ppm carry-over). (2) Different fragrance families (e.g., woody to floral) — a full CIP (Clean-In-Place) cycle is required: water rinse, surfactant wash, water rinse, ethanol rinse (to remove surfactant residue), nitrogen purge and dry. TOC and fragrance GC analysis of rinse water confirms clean. (3) Allergen-containing fragrances (IFRA 26 restricted ingredients) — enhanced cleaning validation with allergen-specific ELISA test may be required. Our filling machine CIP system automates the full cleaning cycle — cycle time 45–90 minutes depending on the cleaning protocol.