| 摘要 |
PURPOSE:To obtain stably a high-purity permeated liquid for many hours when used at high temps. and pressure by specifying the relation between the yarn density of woven fabric as a base material for supporting a semipermeable membrane and the yarn density of woven and knitted fabric as a passage material. CONSTITUTION:The semipermeable membranes 17 and 17' are formed on base materials 25 and 25', and the base materials 25 and 25' are placed on each other at a position to hold a passage material 24 in between from both sides. The passage material 24 is provided with ribs having suitable height, and a permeated liquid flows through the clearance as a passage 23 formed by the grooves between the ribs and the base material 25. The base material 25 and 25' are formed of woven fabric A and the passage material 24 of woven and knitted fabric B. The relation between the yarn density Nb (number/25mm.) of the woven and knitted fabric B in the direction of the woven and knitted fabric B vertical to the direction of the passage 23 and the yarn density Na (number/25mm.) of the woven fabric A in the same direction is regulated to Nb<=Na-13 or Na+8<=Nb. The yarn density Na of the woven fabric A as a basis is regulated to about 60- 80/25mm.. |
