What are the structures of cosmetic packaging spray pumps?

Update:13 Jul 2020
Summary:

Spray pump, also known as sprayer, is the main accessor […]

Spray pump, also known as sprayer, is the main accessory product of cosmetic packaging containers and one of the content distributors. Spray pump is a liquid that uses the principle of atmospheric balance to eject the liquid in the bottle by pressing, high-speed flowing liquid It will also drive the gas flow near the nozzle orifice, so that the velocity of the gas near the nozzle orifice becomes larger, the pressure becomes smaller, and a local negative pressure area is formed. Lotion pump lotion is a liquid cream skin care product, because it looks pure white like milk, so it is called lotion. The lotion has a good emollient effect and also has a moisturizing effect. It is especially suitable for dry spring and autumn seasons. If the skin is neutral, it can also be used in winter. Therefore, the surrounding air is incorporated into the liquid to form a gas-liquid mixture, and the liquid is atomized. The structure of the spray pump mainly has the following points:
1. Main accessories of spray pump
Conventional spray pumps are mainly composed of pressing nozzle/head, diffusion nozzle, central catheter, lock cover, packing, piston core, piston, spring, pump body, suction pipe and other accessories, in which the piston is an open piston, which is connected to the piston seat , When the compression rod moves upward, the pump body is open to the outside, and when the upward movement, the studio is closed. According to the structural design requirements of different pumps, the relevant accessories will be different, but their principles are consistent with the ultimate purpose.
2. The principle of spray pump water output
Exhaust process: Suppose there is no liquid in the base studio in the initial state. Press the pressing head, the compression rod drives the piston, the piston pushes the piston seat down, the spring is compressed, the volume in the working chamber is compressed, the air pressure increases, and the water stop valve seals the upper port of the dip tube. Since the piston and the piston seat are not completely closed, the gas squeezes the gap between the piston and the piston seat to separate them, and the gas escapes.
Water absorption process: After venting, release the pressing head, the compressed spring is released, pushing the piston seat up, the gap between the piston seat and the piston is closed, and the piston and the compression rod are moved upward together. Lipstick tube Lip balm is a personal care product that is generally applied to the lips. After lip balm is applied to the lips, it can effectively prevent the lips from rubbing and peeling due to dry weather. The main ingredients of lip balm include beeswax, petrolatum, menthol and camphor. In addition, in order to strengthen the moisturizing function, the current lip balm will also add vitamins, salicylic acid and other ingredients. The appearance of a general lip balm in a lipstick tube is the same as that of a lip balm. They are all in the shape of a support. However, in recent years, new lip balm products have been introduced. Some parts are squeezed, and some need to be applied to the lips by hand. The volume in the working room increases, the air pressure decreases, and approximates vacuum, so that the air pressure above the liquid level in the container is opened by the water stop valve to press the liquid into the pump body to complete the water absorption process.

Outlet process: The principle is the same as the exhaust process. The difference is that at this time, the pump body is already filled with liquid. When the pressing head is pressed, on the one hand, the water stop valve seals the upper end of the dip tube to prevent liquid from returning from the dip tube to the container; on the other hand, the liquid will rush out of the gap between the piston and the piston seat due to the liquid being compressed , Into the compression tube. And come out of the nozzle.
3. The principle of spray pump atomization (basic law)
Because the nozzle opening is very small, if the pressure is smooth, when the liquid flows out of the small hole, the liquid flow rate is very large, that is to say, the air at this time has a large flow rate relative to the liquid, which is equivalent to the problem of high-speed airflow impacting the water droplets. Therefore, the subsequent analysis of the atomization principle is exactly the same as the ball pressure nozzle. The air impacts the large water droplets into small water droplets, and refines the water droplets step by step. At the same time, the high-speed flowing liquid will also drive the gas flow near the nozzle orifice, so that the velocity of the gas near the nozzle orifice becomes larger, the pressure becomes smaller, and a local negative pressure area is formed. Therefore, the surrounding air is incorporated into the liquid to form a gas-liquid mixture, and the liquid is atomized.