paper mill and method for the production of structured tissue paper

摘要

A paper machine and a method for manufacturing a structured soft paper web are described, which machine has a wet section (2), a press section (3), a drying section (4) and a web-carrying clothing (22) running around a suction device (23) close to a smooth impermeable belt (16) in the press section for the creation of a transfer point (40). In accordance with the invention, structuring means (A; B) for structuring the web are arranged between the press section and the drying section. The structuring means comprise either (A) said clothing in the shape of a permeable wire, the structure of which is made up of depressions (35) and arched surface parts (36), including knuckles in a quantity of 25-150 knuckles per cm2, and a suction device (25) that, at a vacuum of 40-80 kPa, draws the web to the structured side of the wire so that the web acquires the structure of the wire, wherein the wire operates at a speed /= the speed of the belt, or (B) a creping doctor (26) that is located in a space between the belt and the clothing and in scraping contact with the belt so as to loose the web during simultaneous crinkling, the suction device having a suction gap (27) for initial suction of the web firmly to the clothing for transfer to a drying cylinder. The web-carrying clothing operates then at a speed that is the speed of the belt.