Let me talk about the type and structure of the aerosol valve first
We classify from use:
Commonly used valves, standard valves, that is, valves used for upright injection in the usual sense,
The 360 valve is a valve that can be sprayed upright or inverted, but it is not a 360° valve in the true sense. When there is a certain angle, it can only spray propellant, not gas and liquid at the same time.
The omnidirectional valve is a valve that can be sprayed at any angle of 360° in the true sense. It can be upright, inverted, and horizontal. It is less used in China and is mainly used in high-end cosmetic products. The valve stem of this type of valve has A drape, when you lean to any angle, the drape will fall to the lowest position in the jar. When the button is pressed, the valve channel opens, and it can be ejected at any angle
Key points of aerosol valve selection
The choice of sealing cup material: the thickness of the iron cup is usually 0.27mm, the thickness of the aluminum cup is usually 0.42mm, and the two materials can be used in the form of materials, and can also be used with layers of different materials. The commonly used ones are introduced below. Several materials of sealing cup:
The choice of gasket material: gaskets are usually divided into inner gaskets and outer gaskets. They are made of various materials, mainly: Buna, neoprene, butyl, chlorobutyl, nitrile, chloroprene, polyurethane, etc. .
According to the different materials and propellants, choose the right material to adjust the ideal formula. You can also consult the valve supplier for the suitability of the material, which is a good way for beginners to speed up the development process. Different valve suppliers have different levels, so you can consult some top valve suppliers.
General recommendations: diner (water-based, alcohol-based), chloroprene (oil-based, solvent), butyl (DME, strong solvent), etc.
Selection of stem aperture: common sizes are 0.33, 0.41, 0.46, 0.51, 0.61mm, and the number of stem holes is one of the determinants of the ejection rate. There are also different series of the number of stem pores, there are 1, 2, 4, 6 and even 8 holes.
The choice of gas phase side hole: the gas phase side hole is located on the valve chamber body, and the valve is located inside after the valve is sealed. It is mainly used to increase the atomization effect, increase the ejection stability of the content of some powder products, and increase the ejection of high-viscosity products, etc. Features. There are single-hole and double-hole designs.
Selection of dip tube length: The dip tube length can be set according to:
Valve length = total height of the tank-experience value
Please note that it does not mean that the material of the sealing cup of the valve must be the same as that of the aerosol can. R&D personnel can set it according to the characteristics of the product and verify it through the stability test.
It is also recommended that you can ask the supplier for gaskets, stems, springs, valve chamber bodies, and dip tubes of different materials, and build your own database so that when you need it in the future, you can quickly read the information and choose what you need Material.
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Fever L.//SMC Editor