Abstract: A unit cell for fluid fractionating apparatus, fractionating apparatus including such cells and methods of making the cells in which a plurality of hollow fibers are arranged linearly in at least one groove formed in a core, the groove or grooves supporting all or part of the hollow fibers and acting as a bed for said fibers, two end walls of hardened glue securing the hollow fibers to one another and at their ends these walls being firmly secured to the core. The core may be for example of channel shaped, H-shaped, cross-shaped or star-shaped cross-section, and the cell may be enclosed in a jacket having at least one fluid inlet and at least one fluid outlet passage. The construction of the cells makes for easy manufacture by winding the fibers or bundling the fibers and placing them in the grooves of the core and securing them in place by the hardened glue end walls.

Abstract: An assembly of hollow fibers for use in fluid treatment apparatus and apparatus incorporating such assemblies, in which a primary frame is provided with a central window defined by edges at least two of the opposite edges being thinned down to form hollows. A web of hollow fibers is placed in the hollows and is secured in place, and the fibers secured to one another, by a mass of hardened resin material in at least one of the hollows.The assemblies are mounted in a container, through which a first fluid is caused to flow, the fluid passing around the fibers and through the windows before leaving the container. The interiors of the hollow fibers are connected to the exterior of the container so that either fluid permeate flows out of the apparatus via the interiors of the fibers or a second fluid is caused to flow through the interiors of the fibers if some form of fluid exchange is desired.