Removal of urea, ammonia and carbon dioxide from diluted aqueous solutions, for instance urea process effluent, the solution being led into the top of a reaction column under a pressure of 10-30 bar, in which it flows down in counter-current to a flow of gas, for instance steam. The temperature in the top of the reaction column is 170-220 DEG C; at the bottom, it is 180-230 DEG C. Next, at a press...

Process for obtaining cellular materials, based on unsaturated polyester resin optionally containing reinforcing and/or inert fillers, having a density between 0.2 and 1.0 kg/l by moulding under pressure a liquid foam of said resins, characterized by the fact that the liquid foam based on unsaturated polyester resins containing conventional additives, optionally containing an inert and/or reinforc...

A seating platform e.g. for domestic furniture or motor vehicle seats comprises at least one moulded elastic element mounted on a frame member and covered by a non-stretch sheet which, upon installation, is only lightly tensioned. The elastic element is of a substantially incompressible material, e.g. a rubber composition high in natural rubber, and includes spaced apart grooves which permit contr...

Rubber compositions and metal-reinforced rubber ply members have improved metal adhesion and metal adhesion retention to brass and brass-plated metallic reinforcement. The improvement comprises admixing from about 0.5 to about 12.5 parts per hundred rubber (phr) of an organic salt of nickel and at least about 3.0 phr of a thermoplastic resin derived from crude wood rosin containing carboxylic acid...

PURPOSE:To correct white defects with high precision for a short time, by measuring light quantity passing through a photomask to use it as information on irradiation stop in correcting the photomask defects by light irradiation. CONSTITUTION:Film 10 of a complex of a metal such as silver is formed on the upper surface of photomask 6 having white defects 11. Width of opening slit 3 is controlled, ...

A buzz wave comprising n harmonic components having a flat spectrum envelope is generated according to a relatively simple algebraic expression which can be digitally computed by an arithmetic operation. Modifying harmonic components corresponding to the harmonic components to be emphasized or suppressed are also generated. The buzz wave and the modifying components are added or subtracted to form...

PURPOSE:To obtain the polyimide film suitable for the covering of the elctric wire etc., by preventing cutting at the ear part, by peeling off the self-supporting polyamide acid gel film from the substrate, fixing to the preheated fixture, then heat treating. CONSTITUTION:The organic solvent solution of polyamide acid as the predecessor of polyimide shown in formula (e.g. DMF solution of concentra...

PURPOSE:To obviate that air is not included into lettering sections at the time of molding, by arranging vents leading to the undersurface side of a substrate at the end sites of the flow of a material in the cavities for letters, and a venting space between the substrate undersurface and the mold surface. CONSTITUTION:The substrate 1A of a synthetic resin is injection molded to have the plurality...

PURPOSE:To omit any propjections on an internal surface of a pipe so as to make the transportation of a liquid smooth and obviate stagnation of any foreign matter in the pipe, by winding a flexible elongated member helically into a pipe with opposite edges engaged to form a fitting ridge on the exterior surface of the pipe, and fitting the ridge into a clamping means having a fitting groove to cla...