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AssigneeNone recorded
InventorsChoong-Joong Lee, Soon-Kyu Chung, Jin-Soo Joo
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The present invention relates to high dielectric non-woven fabrics and their synthetic process. Particularly, the present invention relates to a process for preparing high dielectric non-woven fabrics comprising the steps of (a) mix-spinning polyvinylidene fluoride (PVDF) and polypropylene (PP) to prepare a fiber, (b) polarizing the fiber prepared in the step (a) to improve the dielectric constant of the fiber, and (c) manufacturing non-woven fabrics from the fiber having improved dielectric constant, prepared in the step (b), and non-woven fabrics prepared according to the mentioned process. The non-woven fabrics of the present invention have very improved static electricity retention properties compared to the dielectric non-woven fabrics of the prior art. Thus, when they are applied to an electrostatic filter or sweeper, they can be made into an electrostatic filter that has a longer life time and excellent filtration efficiency for micro-particles and ionic particles, or to a sweeper that has high static electricity retention property and longer life time.
A process for preparing high dielectric non-woven fabrics comprising the steps of
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Addition polymers: olefin series
The material being fibrous: of synthetic origin
Physical treatment of artificial filaments or the like during manufacture, i.e. during
From mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or…: of…
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(a) Field of the Invention
The present invention relates to high dielectric non-woven fabrics and their synthetic process. Particularly, the present invention relates to non-woven fabrics which have a high-dielectric constant. They have a very improved static electricity retention property compared to the dielectric non-woven fabrics of the prior art. The high dielectric non-woven fabrics can be applied to an electrostatic filter having excellent filtration efficiency of micro-particles and ionic particles, and they can be applied to a sweeper having high static electricity retention properties, both having a long life time.
The present invention also relates to an electrostatic filter and sweeper made from the non-woven fabrics mentioned above.
Fiber having a thickness of 10 μm was obtained by mix-spinning 10% by weight of polyvinylidene fluoride and 90% by weight of polypropylene. Said fiber was polarized by scanning electronic beams thereto while repeatedly winding/unwinding/rewinding them to prepare fiber having an improved dielectric constant. Said fiber having improved dielectric constant was manufactured to be high dielectric non-woven fabrics by needle punching while controlling the density thereof to 250 g/m2.
The high dielectric non-woven fabrics of the present invention were prepared by the same manner as described in Example 1 except that it was done by mix-spinning 5% by weight of polyvinylidene fluoride and 95% by weight of polypropylene.
The high dielectric non-woven fabrics of the present invention were prepared by the same manner as described in Example 1 except that it was done by mix-spinning 15% by weight of polyvinylidene fluoride and 85% by weight of polypropylene.