Abstract: A hollow fiber separation membrane element and a module thereof which comprise a bundle of a great number of bunches of hollow fiber separation membranes, the bunches of hollow fiber separation membranes being each reinforced with a filament wound therearound. Breakage or rupture of the hollow fiber separation membranes is prevented during production and use.

Abstract: An antibiotic film comprises at least one organic polymeric film containing antibiotic zeolite, in which the content of the antibiotic zeolite is 10 to 100 mg per 1 m.sup.2 of the organic polymeric film and the thickness of the organic polymeric film is not more than 15 microns and an antibiotic laminated film comprises a substrate, at least one side of which is laminated with the aforementioned antibiotic film. These films exhibit excellent antibiotic action although they contain rather small amount of antibiotic zeolite and the films also exhibit high transparency. These films can be used as materials for packaging foods, medical equipments and accessories and the like.

Abstract: A sterilized cooking board comprises a base board and an organic polymer layer containing an antibacterial zeolite and formed on the entirety of at least one surface of the base board in an upheaval shape.

Abstract: An antibacterial material for water comprising a carrier containing an antibacterial agent and a fabric surrounding it is disclosed. When this antibacterial material for water is placed in water, microorganisms living in the water would pass through the fabric and approach the carrier, so that they are attacked by the antibacterial agent contained therein and die. On the other hand, contaminants and slime in the water cannot approach the carrier since they are filtered off by the fabric. Therefore the surface of the carrier is hardly coated with contaminants or slime and kept in an exposed state. As a result, the antibiotic effect of the antibacterial material on the water can be maintained for a long period of time.

Abstract: An antibiotic resin composition comprises at least one antibiotic zeolite of which ion-exchangeable ions are partially or completely replaced with ammonium ionsand antibiotic metal ions, at least one discoloration inhibitor and at least one resin. The antibiotic resin composition exhibits excellent antibiotic property and does not discolor with time. Thus, the resin composition can be employed to form a variety of products which require antibacterial and/or antifungus properties.

Abstract: An antibiotic zeolite and an antibiotic resin composition containing thereof are provided. The antibiotic zeolite is prepared by replacing all or a part of ion-exchangeable ions in zeolite with ammonium ions and antibiotic metal ions such as silver, copper, zinc, mercury, tin, lead, bismuth, cadmium, chromium and thallium. The antibiotic resin composition comprises the antibiotic zeolite and a resin such as polyethylene, polypropylene, polyvinyl chloride and polystyrene.

Abstract: A method for preparing a dispersion containing antibiotic powder comprises mixing the antibiotic powder and a dispersing medium at a temperature at which the dispersing medium is in the form of a liquid under a reduced pressure of not more than 470 Torr. According to this method, the antibiotic powder is uniformly dispersed in various dispersing mediums and antibiotic products having high antibiotic action is effectively be provided by using the resulting dispersion.

Abstract: A process for separating oxygen more than 90% pure from a raw material gas, for example air, containing oxygen and nitrogen as main components, includes at least two adsorption zones, each having an inlet and a discharging end, and containing therein a bed of an adsorbing agent having sieving action which is capable of selectively adsorbing nitrogen from said raw material gas.

Abstract: A duplicator in which analog signals recorded on a master or like source tape are transferred to digital discs after conversion into digital form and the digital signals thus recorded on the digital discs are then transferred to slave tapes after reconversion into analog form.