Cosmetic Treatment Pump's composition and working principle

A standard plastic lotion pump usually has 6 parts.

Actuator - Made of polypropylene, also known as the pump head, whose main task is to expel the contents of the lotion pump container when pressurized.

Closure - With which the entire assembly is secured to the neck of the lotion pump.

Outer gasket - usually made of low-density polyethylene or rubber, helps prevent contents from leaking out of the mouth area and is usually a friction fit inside the closure.

Housing - Sometimes called pump assembly housing, it holds all the parts of the lotion pump in one place. The lotion pump housing also doubles as a transfer vessel for transferring the contents from the dip tube to the actuator.

Inner Housing Components (Ball/Spring/Piston/Rod) - The inner housing components of a lotion pump depend on the individual product design and vary from manufacturer to manufacturer.

Dip Tube - This is a long tube made of polypropylene that runs from the nozzle of the lotion pump to the bottom.

How Lotion Pumps Work

STEP 1 - The lotion pump functions like an aspirator. It defies gravity and helps the contents of the tank reach the user's palm.

Step 2 - When the actuator is depressed, the piston moves which in turn compresses the spring. It effectively allows the upwardly applied air pressure to pull the ball upwards along with the contents of the dip tube. The contents first fill the dip tube and then go to the lotion pump chamber.

Step 3 - After releasing the actuator, the spring will reposition to its original position. The ball returns to its standby position and seals the jar, cutting off the flow of the contents so they cannot return to the lotion pump bottle.

step 4 - the above three steps are collectively referred to as start-up. When the actuator is depressed again from its rest position, the container contents will first pass through the valve stem and then reach the actuator. Finally, the pump dispenses the liquid into the user's hands.