Classification and working principle of vacuum pumps and bottles

The selection of cosmetic packaging basically includes five elements: product compatibility, seal integrity, barrier integrity, appearance appreciation, and physical properties in circulation. The integrity of the seal (that is, the airtightness of the package) is particularly important, because the active ingredients in most cosmetics are extremely volatile compounds, and many natural ingredients are easily discolored and deteriorated when exposed to air. High-end brands choose vacuum packaging not only for aesthetic reasons. Many high-end brands of skin care products have very advanced formulations and have specific requirements for vacuum packaging, so they need to be optimally protected.

The vacuum pump and the bottle body need to be easily evacuated, the liquid distribution amount is uniform, and the internal space is reduced with the reduction of the material body, which isolates the outside air from entering, and the packaging has a beautiful appearance. Consumers can dispense the products in the package at any position and angle, realizing a 360º omni-directional application without dead ends.

In practical applications, the vacuum pump and bottle system can be divided into three main categories.

1. Piston vacuum system

This system is the most widely used one of the existing vacuum pumps and bottle bodies. A piston is installed inside the bottle body to create a closed space between the press head and the material body is stored in this space. Press the vacuum pump to press the head , Promote the vacuum state in the space, use the outside atmospheric pressure to push the piston to move, so as to distribute the material body through the liquid outlet of the vacuum pump. The key point of this technology is the cooperation between the piston and the bottle wall: the piston and the bottle wall should not be too tight or too loose. Too tight is likely to cause the piston to be unable to move and the liquid cannot be pumped out. Too loose is likely to cause leakage. Therefore, it is limited by changes in packaging shapes, and very regular packaging forms such as round or oval are common.

2. Hose vacuum system

This system is based on the evolution of ordinary hoses, replacing the original cover with a vacuum pump head. By pressing the head of the vacuum pump, the inside of the hose is promoted to generate a vacuum state, and the outer wall of the hose is compressed and deformed by the atmospheric pressure, so that the discharge body is distributed through the discharge hole of the vacuum pump. Because the hose wall is composite stretched by multiple layers of materials, it has a certain strength and requires relatively high suction and tightness of the vacuum pump head.

3. Inner vacuum system

This system can be said to be a combination of the above two, that is, it has a hard appearance and a soft liner. The material of the inner tank can be PE, aluminum bag, etc. The way of distributing and discharging the material is similar to the hose-type vacuum system, so it will not be described here.

Different paths lead to the same goal. For the existence of different vacuum system structures, there must be a desirable side. Of course, each structure cannot be seen face to face, and can adapt to the infinitely changing use environment. Before determining the system structure of the vacuum pump and the bottle, relevant preliminary investigations should be done, such as the viscosity of the material, the use environment, the compatibility with the material, and so on.