摘要:
A hollow fiber membrane is made by covering a tubular supporting structure with a membrane dope and converting the membrane dope into a solid porous membrane wall. Optionally, a textile reinforcing structure in the form of a circular knit may be added around the supporting structure before it is covered in dope. The reinforcing structure thereby becomes embedded in the membrane wall. The supporting structure may be soluble in a non-solvent of the membrane wall, for example water, and may be removed from the membrane. Alternatively, the supporting structure may be porous. A porous supporting structure may be made by a non-woven textile process, a sintering process within an extrusion machine, or by extruding a polymer mixed with a second component. The second component may be a soluble solid or liquid, a super-critical gas, or a second polymer that does not react with the first polymer.
摘要:
Disclosed is the method for creating a reinforced hollow fiber membrane by applying reinforcing filaments to a core, casting a dope over the filaments and core, forming a membrane from the dope, and removing the core. The core may be a moving core, and the reinforcing yarns may comprise warp yarns and a spiral wrap yarn. The core may be soluble and removed by dissolving it. The core may be pre-wrapped with a yarn before the warp yarns are applied. The resulting reinforcing cage may be pre-shrunk before it is coated with a membrane dope. The pre-wrapped yarn may be removed, for example by dissolving it, after the reinforcing cage is coated. A precursor assembly for making a hollow fiber membrane is also provided.
摘要:
The invention relates to a hollow fiber bundle (1) for accommodation in a mass transfer device, said hollow fiber bundle comprising a multitude of hollow fiber strands (10a, 10b, 10c) for heat transfer and/or mass transfer which are aligned essentially at least locally along a preferential direction and are arranged with respect to one another in relation to their local preferential directions such that at least one first group of hollow fiber strands points essentially in a first preferential direction (Vl), at least one second group of hollow fiber strands essentially in a second preferential direction (V2) and at least one third group of hollow fiber strands in essentially a third preferential direction (V3), said three preferential directions being independent of one another.
摘要:
A hollow fiber membrane has a reinforcing structure with a plurality of reinforcing filaments embedded in the wall of the membrane. The reinforcing filaments may include warp filaments, which are substantially continuous along the length of the membrane, and one or more warp filaments, which extend obliquely between two or more warp filaments. The warp filaments may be in the form of a spiral, a zigzag or a set of discontinuous filament segments. The reinforcing filaments are not woven together, but they may be bonded at points of contact where they intersect each other. The bonding may be by heat, solvent, or UV-activation. The filaments may have an outer layer with a polymer that responds to the bonding method. The membrane preferably has an inside diameter to outside diameter ratio larger than 0.60. The reinforcing structure may be impregnated with a membrane dope in a continuous operation in which the reinforcing structure formation and dope impregnation are done one after the other at the same speed.
摘要:
A moisture-permeable separating membrane material includes a porous fluororesin membrane, a continuous moisture-permeable resin layer formed on the surface of the porous fluororesin membrane, and a textile layer for reinforcing the porous fluororesin membrane and the continuous moisture-permeable resin layer. The textile layer contains a flame retardant in the inside of each fiber and the surface of each fiber has been treated with a flame retardant. The moisture-permeable separating membrane material makes it possible to improve flame retardancy without deteriorating heat exchange characteristics.
摘要:
The invention relates to a method for producing hollow carbon fibres (7) by treating a stabilized carbon fibre precursor (1) in an application device with high-frequency electromagnetic waves, wherein the application device comprises means for feeding the electromagnetic waves into a coupling-out region and a hollow outer conductor opening into the coupling-out region (9). For the treatment, a field of the high-frequency electromagnetic waves is generated (5) and a field strength in the range from 15 to 40 kV/m is set in the coupling-out region of the application device. The stabilized carbon fibre precursor is continuously led through the hollow outer conductor as an inner conductor (2), whereby a coaxial conductor comprising the outer conductor (3) and the inner conductor is formed. An inert gas atmosphere is produced in the coaxial conductor and in the adjoining coupling-out region by the passage of an inert gas. The hollow carbon fibres obtained have a continuous lumen, extending in the longitudinal axis of the fibre, and an inside diameter in the range between 5 and 20 µm and a wall thickness in the range between 1.5 and 7 µm.
摘要:
[Object] To provide an oxygenator of a hollow fiber membrane type wherein permeability and exchange ability of oxygen and carbon dioxide gas are excellent, elution into the blood is small, strength is excellent, blood coagulation and plasma leakage are low. [Constitution] An oxygenator of a hollow fiber membrane type where a plurality of hollow fiber membranes are received in a housing, characterized in that at least a part of the regions of contact with the blood of the hollow fiber membrane is coated with a water-insoluble (meth)acrylate copolymer in which a hydrophobic (meth)acrylate is copolymerized with a hydrophilic (meth)acrylate at a molar ratio of (50 to 90) : (50 to 10) (hereinabove, the term "water-insoluble" means that, when 1% by weight of the (meth)acrylate copolymer is allowed to stand for 30 days in 99% by weight (to said copolymer) of a physiological saline solution of 37°C, a weight reduction ratio of said copolymer is not more than 1% by weight).
摘要:
A liquid filter with a composite medium that has a nanoweb adjacent to and optionally bonded to a microporous membrane. The membrane is characterized by an LRV value of 3.7 at a rated particle size, and the nanoweb has a fractional filtration efficiency of greater than 0.95 at the rated particle size of the membrane. The nanoweb also has a thickness efficiency ratio of greater than 0.01 at that efficiency. The nanoweb acts to provide depth filtration to the membrane, prefilters particles and extends the lifetime of the membrane.
摘要:
A braid-reinforced composite hollow fiber membrane is disclosed. The braid-reinforced composite hollow fiber membrane comprising a reinforcing material of a tubular braid and a polymer resinous thin film coated on the surface of the tubular braid according to the present invention is characterized in that: the tubular braid comprises multifilaments made of monofilaments having a crimp rate of 2 to 40%, and the peeling strength of the tubular braid and a polymer resinous thin film coated on the surface thereof is 1 to 10 MPa. In the composite hollow fiber membrane, the crimp rate of the monofilaments constituting the tubular braid of the reinforcing material is 2 to 40%, thus the surface area of the tubular braid contacted with the polymer resinous thin film is increased. Thus, the peeling strength of the tubular braid and the polymer resinous thin film coated on the surface thereof is excellent.