Claims
- 1. A fluid separation element, comprising:
- a casing;
- a bundle of selectively permeable hollow fibers accommodated therein, said fibers having been dried with hot air having a temperature of 90.degree. to 100.degree. C. and an amount of 2.5 to 10 m.sup.3 /m.sup.2 of the outer surface of the hollow fiber; and
- a resinous potting agent for potting the end portions of the fibers and blocking the gaps among the fibers, wherein:
- the ratio of the porosity of the membrane of the hollow fiber at the effective permeation portion (HA) and the porosity of the membrane of the hollow fiber at the potting portion (HB) satisfies the following condition:
- 0.9.gtoreq.HB/HA.gtoreq.0.4;
- and
- the outer diameter of the hollow fiber at the effective permeated portion (OD.sub.A) and the outer diameter of the hollow fiber at the potting portion (OD.sub.B) satisfies the following condition:
- 0.95.gtoreq.OD.sub.B /OD.sub.A .gtoreq.0.7.
- 2. A method for forming a fluid separation element, comprising the steps of:
- drying the end portions of a bundle of selectively permeable hollow fibers with hot air having a temperature of 90.degree. and 100.degree. C. and with an amount of hot air of 2.5 to 10 m.sup.3 /m.sup.2 of the otuer surface area of the hollow fiber; and
- potting said dried end portion in a resinous potting agent to enhance the potting characteristics; wherein:
- the fibers and drying conditions are selected such that at the completion of drying the ratio of the porosity of the membrane of the hollow fiber at the effective permeation portion (HA) and the porosity of the membrane of the hollow fiber at the potting portion (HB) satisfies the following condition:
- 0. 9.gtoreq.HB/HA.gtoreq.0.4;
- and
- the outer diameter of the hollow fiber at the effective permeation portion (OD.sub.A) and the outer diameter of the hollow fiber at the potting portion (OD.sub.B) satisfies the following condition:
- 0.95.gtoreq.OD.sub.B /OD.sub.A .gtoreq.0.7.
Priority Claims (1)
Number |
Date |
Country |
Kind |
55-97057 |
Jul 1980 |
JPX |
|
Parent Case Info
This is a continuation-in-part application of our copending application Ser. No. 283,697 filed on July 15, 1981, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3734989 |
Leonard |
May 1973 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
283697 |
Jul 1981 |
|