The spray products are the main supporting product of cosmetic containers and one of the content distributors. It uses the principle of atmospheric balance to spray the liquid in the bottle by pressing. The high-speed flowing liquid will also drive the gas flow near the nozzle, making the speed of the gas near the nozzle increase and the pressure decrease, forming a local negative pressure area. Thus, the surrounding air is mixed into the liquid to form a gas-liquid mixture, which makes the liquid produce an atomization effect.
Manufacturing process
1.Molding process
Most of the internal parts of the spray are made of plastic materials such as PE, PP, LDPE, etc., and are injection molded.
2.Surface treatment
The main components of the spray can be applied to vacuum plating, electroplating aluminum, spraying, injection molding and other methods.
3.Graphics and text processing
The surface of the spray can be printed with graphics and text, and can be operated using processes such as hot stamping and silk screen printing.
1.Main accessories
Conventional sprays are mainly composed of nozzles/heads, diffuser nozzles, central conduits, lock caps, gaskets, piston cores, pistons, springs, pump bodies, straws and other accessories. The piston is an open piston, which is connected to the piston seat to achieve the effect that when the compression rod moves upward, the pump body is open to the outside, and when it moves upward, the studio is closed. Depending on the structural design requirements of different pumps, the relevant accessories will be different, but the principle and ultimate purpose are the same, that is, to effectively take out the contents.
2.Product structure reference
3.Water outlet principle
- Exhaust process:
Assume that there is no liquid in the base working chamber at the start. 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 water pipe. Since the piston and the piston seat are not completely closed, the gas squeezes the gap between the piston and the piston seat, causing them to separate and the gas to escape. - Water absorption process:
After exhausting, release the pressing head, the compressed spring is released, pushing the piston seat upward, closing the gap between the piston seat and the piston, and pushing the piston and the compression rod upward together. The volume in the studio increases, the air pressure decreases, and it is close to a vacuum, so that the water stop valve opens and the air pressure above the liquid surface in the container presses the liquid into the pump body, completing the water absorption process. - Water discharge process:
The principle is the same as the exhaust process. The difference is that at this time, the pump body is already full of liquid. When the pressing head is pressed, on the one hand, the water stop valve seals the upper end of the water pipe to prevent the liquid from returning to the container from the water pipe; on the other hand, due to the extrusion of the liquid (incompressible fluid), the liquid will break the gap between the piston and the piston seat, flow into the compression pipe, and come out from the nozzle.
Atomization principle
Since the nozzle opening is very small, if the pressure is smooth (i.e., there is a certain flow rate in the compression tube), when the liquid flows out of the small hole, the liquid flow rate is very high. In other words, the air at this time has a very high flow rate relative to the liquid, which is equivalent to the problem of high-speed airflow impacting water droplets. Therefore, the subsequent atomization principle analysis is exactly the same as that of the ball pressure nozzle. The air impacts large water droplets into small water droplets, and the water droplets are refined step by step. At the same time, the high-speed flowing liquid will also drive the gas flow near the nozzle opening, making the speed of the gas near the nozzle opening increase, the pressure decreases, and a local negative pressure area is formed. As a result, the surrounding air is mixed into the liquid to form a gas-liquid mixture, so that the liquid produces an atomization effect.
Spray pump products are widely used in cosmetic products, such as perfume, gel water, air freshener and other water-based products.
