Method and apparatus for making a filtering unit
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United States of America Patent
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May 14, 2013
Grant Date -
Dec 22, 2011
app pub date -
Jun 22, 2010
filing date -
Jun 22, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
Disclosed is a method for making a disk-shaped filtering unit. In the method, there is provided a laminate by sandwiching a screen-related substrate between two permeable membrane-related substrates. There is provided a machine with a conveying unit, a hot-pressing unit and a punching unit. The conveying unit is used to convey the laminate. The hot-pressing unit is used to hot-press and weld the laminate dot by dot to bond the substrates along a closed curve eventually, thus making a semi-product of the filtering unit out of a portion of the laminate within the closed curve. There is made a final product of the filtering unit by using the punching unit to punch the semi-product with an aperture.
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