Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting
Patent
1996-11-20
1998-11-24
Therkorn, Ernest G.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Forming continuous work followed by cutting
264159, 264261, 264263, 2642711, 2103218, 21032189, 21050023, B01D 1116
Patent
active
058402306
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a 371 of PCT/DK94/00214 filed Jun. 2, 1994.
TECHNICAL FIELD
The present invention relates to a process for the manufacture of hollow fibre sections for hollow fibre modules and said hollow fibre section for a hollow fibre module.
BACKGROUND OF THE INVENTION
Hollow fibre modules are used in connection with exchange operations, separation operations and mixing operations. In exchange operations it is a question of both heat and mass exchange. In heat exchange heat is exchanged between two fluids of different temperature, whereby the fluid having the lower temperature obtains a higher temperature than the starting temperature. By mass exchange is in particular meant membrane processes, like dialysis (for instance an artificial kidney), direct osmosis, gas-gas-exchange and gas-fluid exchange (for instance an oxygenator). In separation processes particularly ultrafiltration, reverse osmosis and gas permeation is of interest. By mixing processes is for instance meant humidification and/or conditioning of air by admixing aqueous vapour thereto.
In the present description and claims the term "hollow fibre section" means the part of a hollow fibre module, which comprises the hollow fibres, said hollow fibres being for instance at the end provided with a plug-like means such that the fluid flowing around the fibres stays within the module.
By the term "fluid" is meant each liquid or gaseous material with such sufficient flow properties that it may pass through a hollow fibre module. By liquid is also meant solutions and suspensions of solid.
GB-A-2 091 125 discloses a process for the manufacture of a hollow fibre section, in which the individual hollow fibres are arranged in a predetermined pattern by means of at least two perforated plates, through the perforations of which the hollow fibres are guided. The perforated plates stay in the module and the hollow fibres are not connected with said perforated plates, and no casting has been done around the hollow fibres before these are cut.
Japanese publication No. 62-160.108 relates to embedment of a hollow fibre bundle in a resin and subsequent cutting of the clamped part of the bundle. The publication does not relate to guiding of the mutual arrangement of the hollow fibres, whereby the mutual arrangement of the fibres is random, and the fibres will physically adjoin each other.
Swedish published specification No. 397,638 discloses to a process for the manufacture of an apparatus for fractioning, in which process fibres are arranged in one or more ducts in a core in such a way that the duct or ducts are filled; the fibres are glued to the ends of the core, the hardened glue forming an end wall at each end of the core; the fibres are cut at the ends of the core and prior to or after the cutting of the fibres a mantle surrounding at least the duct or ducts are provided. This publication does not either relate to guiding of the mutual position of the hollow fibres, and the fibres will be in physical contact with each other.
The drawbacks of the prior art hollow fibres are among others that they are difficult to manufacture on a large scale in a simple way, i.e. with as few process steps as possible, where each individual step is carried out in a simple way, and that the mutual arrangement of the fibres is not controlled.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a process for the manufacture of a hollow fibre section for a hollow fibre module, which process may be automatized in a simple way, in order to make the manufacture of hollow fibre sections a continuous process. It is furthermore the object to provide a process, in which the mutual position of the fibres can be controlled such that the individual hollow fibre has a predetermined position relative to the nearest adjacent hollow fibres.
It has turned out surprisingly that these objects can be met by a process for the manufacture of hollow fibre modules, which is characteristic in that in a casting matrix compr
REFERENCES:
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patent: 3704223 (1972-11-01), Dietzsch
patent: 4038190 (1977-07-01), Baudet et al.
patent: 4293418 (1981-10-01), Fujii
patent: 4689191 (1987-08-01), Beck
patent: 4769146 (1988-09-01), Schmidt
patent: 4781833 (1988-11-01), Mizutani
patent: 4840227 (1989-06-01), Schmidt
patent: 5008061 (1991-04-01), Bluck
patent: 5183566 (1993-02-01), Darnell
patent: 5228992 (1993-07-01), Degen
patent: 5230796 (1993-07-01), Ter Meulen
patent: 5328610 (1994-07-01), Rogut
patent: 5556591 (1996-09-01), Jallerat
Abstract of Japan Patent No. 62-160108A Jul. 1987.
Geleff Svend Andreas
Pedersen Knud S.o slashed.ndertoft
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