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| METAL
FILTERS |
| Overview |
It has become possible recently to
separate the active substance from a mixture using a water purification
system that features a membrane. This system is expected to see widespread
adoption out of consideration for environmental conservation and
as an energy-saving measure. Hitachi Metals has developed an ultrafine
metal filter, drawing from its long track record in the cultivation
of specialty-steel powder metallurgy technology. Figure 1 demonstrates
the filter's separation capabilities. The filtration-membrane filter
separates out particles that are approximately 0.1~1.0 m
in size.
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| Metal
Filter Features |
(1) Structure and Dimensions
Figure 1 shows the structure. The structure consists of a stainless
wire mesh, which is used as a reinforcement material. A fine stainless
steel powder is applied to the mesh and the filter is sintered.
With a thickness of approximately 0.4mm, the filter is thin as
well as wide, measuring 750mm x 750mm.
(2) Sharp Pore Distribution
Figure 2 shows the average pore distribution. Because the particles
of the skin layer exhibit a uniform diameter, the pore distribution
is extremely sharp, allowing for stable filtration.
(3) Part Machining
Metal-injection molds generally have a low degree of transverse strength,
which makes flexural machining very difficult. In contrast, our product
has a reinforced wire mesh that enables flexural machining. Laser
incisions eliminate all restrictions on the types of shapes that
can be machined. Through soldering, it is possible to conjoin the
filter to a base, enabling production of elements in a variety of
shapes. The disk version and cylinder version are shown in figures
3 and 4.
(4) High-Temperature Filtration
Unlike conventional resin membranes that sometimes changes shape
at temperatures over 70°C, our product can conduct stable filtration
at high temperatures.
(5) Easy Maintenance with a Long Life Span
If used for long periods of time, normally a thick layer of crust
builds up on the filtration surface, inhibiting filtration capabilities.
Resin and other filters are usually discarded. Our filters, however,
are machine washable, and the encrusted layer is easily removable,
ensuring a long life.
Chart 1: Filter Diameter and Separation Capability (Reference)
| Filter's nominal diameter (m) |
0.5 |
1.0 |
1.5 |
1.8 |
| Filter's average diameter (m) |
0.51 |
1.03 |
1.51 |
1.83 |
Diameter of 95% of
the separated particles (m) |
0.117 |
0.208 |
0.506 |
1.000 |
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| In a separation capability test,
a solution containing LATEX particles mixed in pure
water was filtered. The pore diameter indicated that
over 95% of the particles could be filtered out. |
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Figure 1:
The structure of the metal filter
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Figure 2:
Average pores ( m)
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Figure 3:
Circular cylinder
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| Inquiries |
Hitachi Metals Precision, Ltd.
Tel.: +81-3-5765-4495
Inquiry Form |
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