Pressed fibrous sheet having a basis weight between 20 and 1000 g / m2 that disintegrates in water comprising, from 10% to 70% water soluble starch based on the total weight of the dry fibrous sheet, said sheet being manufactured according to a wet paper manufacturing process comprising at least 30% of papermaking fibers, in particular cellulosic fibers, said sheet having the following characteristics "a, b and c" a. the disintegration time in water, measured in accordance with NF Q34-020 applied to a sample of the 9 x 8 cm2 sheet, is less than 50 seconds, preferably less than 35 seconds and more particularly less than 15 seconds, b . the loss of resistance measured in accordance with the table test reported in the specification corresponds to the loss of resistance of a sample of said sheet forming an angle of at least 85 °, preferably between 88 ° and 90 ° after having been moistened with water for a duration of 6 seconds, c. The residual wet strength with respect to its dry strength, as measured according to the ring compression test described in the specification, is less than 1%.Lámina fibrosa prensada que tiene un peso base entre 20 y 1000 g/m2 que se disgrega en agua comprendiendo, de un 10 % a un 70 % de almidón soluble en agua basado en el peso total de la lámina fibrosa seca, fabricándose dicha lámina de acuerdo con un procedimiento de fabricación de papel en estado húmedo que comprende al menos un 30 % de fibras de fabricación de papel, en particular fibras celulósicas, Presentando dicha lámina las siguientes características "a, b y c" a. el tiempo de disgregación en agua, medido de acuerdo con la norma NF Q34-020 aplicada a una muestra de la lámina de 9 x 8 cm2, es menos de 50 segundos, preferentemente menos de 35 segundos y más particularmente menos de 15 segundos, b. la pérdida de resistencia medida de acuerdo con el ensayo de mesa que se informa en la memoria descriptiva corresponde a la pérdida de resistencia de una muestra de dicha lámina que forma
