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The following factors need to be considered when choosing a suitable electrostatic tungsten needle for meltblown cloth:
Material
Tungsten needles are usually made of high-purity tungsten material, which has a high melting point, corrosion resistance, and good thermal and electrical conductivity.
Compared with molybdenum wire, tungsten needles can work more stably under high temperature and high pressure environments.
Size
Common tungsten needle specifications are 2.4mm in diameter, 19mm in length, etc., but there are also a variety of specifications to choose from.
When choosing, you need to choose the appropriate power according to the width of the meltblown cloth. The electrostatic electret equipment usually used on meltblown cloth has a voltage between 20-60KV.
Discharge effect
The discharge effect of tungsten needles is more concentrated than that of molybdenum wire, and can better penetrate into the molecular layer of meltblown cloth.
Sparks visible to the naked eye will penetrate the meltblown cloth and affect the filtration performance, which should be avoided.
Durability
Tungsten needles have high durability and are not easy to be damaged or broken.
Compared with molybdenum wire, tungsten needles have a longer service life.
Combining the above factors, choosing electrostatic tungsten needles with high purity tungsten material, suitable size, good discharge effect and durability can maximize the filtration performance of meltblown cloth. At the same time, care should be taken to avoid discharge breakdown caused by excessive voltage.