Title:
SEMIPERMEABLE MEMBRANE SUPPORT
Document Type and Number:
Japanese Patent JP2018130689
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a semipermeable membrane support showing less defects such as pinholes after performing semipermeable membrane coating.SOLUTION: In a semipermeable membrane support made of a nonwoven fabric including a main synthetic fiber and a binder synthetic fiber, the average value of small aperture permeability is 0.3-5.0 cm/cms, the maximum value-minimum value of the small aperture permeability is 3.0 cm/cms or less and a liquid droplet penetration diameter is less than 15 mm (where, the small aperture permeability is permeability obtained by converting permeation resistance measured by a permeability test machine with a small aperture permeation hole (permeation hole area is 0.2π cmand aperture diameter is 8.94 mm) to the permeability of a Frazier type method of JIS L 1913 (2010); the average value of the small aperture permeability is the arithmetic mean value of the small aperture permeability at 10 places of measuring regions being continuous in a width direction and having a diameter of 8.94 mm on center lines of each divided region in a longitudinal direction by uniformly performing X division of the semipermeable membrane support cut so as to have a width of 10×X cm and a length of 10 cm in a width direction; X is a positive integer; the maximum value-minimum value of the small aperture permeability is the maximum value-minimum value of the small aperture permeability at the 10 places; and the liquid droplet penetration diameter is the spreading diameter of a solution permeated into the semipermeable membrane support passing 15 seconds after dropping a solution dissolved with a dye in pure water by 0.035±0.005 milliliter to the semipermeable membrane support).SELECTED DRAWING: None
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Inventors:
YOSHIDA MITSUO
Application Number:
JP2017027426A
Publication Date:
August 23, 2018
Filing Date:
February 17, 2017
Export Citation:
Assignee:
MITSUBISHI PAPER MILLS LTD
International Classes:
B01D69/10; D21H13/24
Domestic Patent References:
| JP2017047333A | 2017-03-09 |
Foreign References:
| WO2010126113A1 | 2010-11-04 |