1. A method of manufacturing an instant product for preparing a beverage, comprising the steps of: a) providing a porous base powder consisting of particulates, b) sintering a layer of said powder while forcing gas through the layer to form a sintered cake in which the porous base powder is characterized in that it has a particle porosity of at least 45%, and in which the pores have a diameter D of less than 80 μm. 2. The method according to claim 1, wherein the porous base powder shows a bulk density of from 150 to 600 g / l. The method according to claim 1, in which the gas velocity through the layer is from 0.01 m / s to 5 m / s. The method according to claim 1, wherein the porous base powder is sintered for a period of time from 2 s to 600 s while simultaneously forcing gas through the bed. The method according to claim 1, in which the sintering is carried out at a temperature that is 30 ° C-50 ° C higher than the glass transition temperature of the base powder layer. The method according to claim 1, in which the sintering is carried out at a temperature of from 0 ° C to 150 ° C. The method according to claim 1, wherein the gas forcibly passed through the layer has a relative humidity of 0% to 80%. The method according to claim 1, wherein the sintered layer has a thickness of 2 to 50 mm. The method according to claim 1, wherein the sintered cake is dried by forcing the drying gas through the bed after sintering. The method according to claim 1, wherein the sintered cake is cooled by forcing the cooling gas through the bed after sintering. The method according to claim 1, wherein the sintered cake is processed into powder after sintering. The method according to any one of claims 1 to 10, wherein the base powder layer is sintered in porous forms to obtain curly objects. Method p1. Способ производства быстрорастворимого продукта для получения напитка, включающий стадии:а) обеспечения пористого порошка-основы, состоящего из макрочастиц,б) спекания слоя указанного п
