POROUS MEMBRANE PRODUCTION METHOD, AND POROUS MEMBRANE DRYING DEVICE

WIPO Patent Application WO/2013/137237

A1

This porous membrane production method involves a solidification step for solidifying a membrane-forming solution by means of a solidification solution to form a porous membrane, and a heating step for drying the porous membrane. The heating step involves at least a water reduction step for reducing the water content in the porous membrane. In the water reduction step, a heating medium for heating the porous membrane is used and the temperature tgh of the heating medium used in the water reduction step fulfills the relation tgh>Td, where Td is the thermal deformation temperature of the membrane material. Further, this porous membrane drying device is provided with a water reduction unit for using the heating medium to reduce the water content in the porous membrane, and a final drying unit disposed downstream from the water reduction unit for using the heating medium to dry the porous membrane. Between the water reduction unit and the final drying unit, a membrane surface temperature measurement means is provided for measuring the membrane surface temperature of the porous membrane. Also provided is a control means for controlling the temperature and/or the flow speed of the heating medium in the water reduction unit depending on the results of measuring the membrane surface temperature.

MAEHARA OSAMU (JP)
KURASHINA MASAKI (JP)
SUMI TOSHINORI (JP)

PCT/JP2013/056774

September 19, 2013

March 12, 2013

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MITSUBISHI RAYON CO (JP)

C08J9/28; B01D69/08; D01D5/24

JP2010149044A	2010-07-08
JPH0254132B2	1990-11-20
JP2005087945A	2005-04-07
JP2005270739A	2005-10-06
JP2006231276A	2006-09-07
JP2012254391A	2012-12-27

SHIGA Masatake et al. (JP)
Masatake Shiga (JP)

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