Dryer sections provided with intermediate calendering in a...

Details Dryer sections provided with intermediate calendering in a... Dryer sections provided with intermediate calendering in a...

D - Textiles, Paper

21

F

D21F 5/04 (2006.01) D21G 1/00 (2006.01)

Patent

CA 2217678

The invention concerns a dryer section of a paper machine which is provided with one or several nips (NK;NKP) of intermediate calendering and in which dryer section there are several successive wire groups (R). The dryer section is primarily or exclusively composed of groups (R1...RV) with single-wire draw, in which the heated drying cylinders (20, 20a) are placed in the upper row and the reversing suction cylinders (30, 30a) or reversing suction rolls (30aa) are placed in the lower row. The groups (R1...RV) with single-wire draw comprise a drying wire (21) which runs along a meandering path over said drying cylinders (20, 20a) and reversing suction cylinders or rolls so that the reversing suction cylinders (30, 30a, 30aa) remain inside the loop of the drying wire (21). Inside the group (Rn) with single-wire draw or in connection with the last drying cylinder (20a), a free space has been arranged, in which a calender roll (10; 10P) is fitted, which forms a calendering nip (NK;NKP) together with the last-mentioned drying cylinder (20a), through which nip the paper web (W) to be dried is passed and, thus, calendered inside the dryer section. Further, five other embodiments of the invention are described.

L'invention concerne une section de séchage d'une machine à papier, permettant un calandrage intermédiaire, au niveau d'une ou plusieurs lignes de contact (NK; NKP) de cylindres. La section de séchage comprend plusieurs groupes de toiles successives (R). Il s'agit essentiellement ou exclusivement de groupes (R¿1?...R¿V?) à toile simple avec des cylindres de séchage chauffés (20, 20a), placés dans la rangée supérieure et des cylindres d'inversion aspirants (30, 30a) ou les rouleaux d'inversion aspirants (30aa) sont placés dans la rangée inférieure. Les groupes (R¿1?-R¿V?) à toile simple comprennent une toile de séchage (21) qui suit un trajet en méandres sur les cylindres de séchage (20, 20a) et les cylindres ou rouleaux d'inversion aspirants, si bien que les cylindres d'inversion aspirants (30, 30a, 30aa) restent à l'intérieur de la boucle formée par la toile de séchage (21). Un espace libre est prévu à l'intérieur du groupe (R¿n?) à toile simple ou près du dernier cylindre de séchage (20a). Un rouleau de calandrage (10; 10P) est installé dans cet espace pour permettre le calandrage de la bande de papier (W) à sécher, au niveau de la ligne de contact (NK; NKP) entre ce rouleau et le dernier cylindre de séchage (20a). Ce système permet un calandrage à l'intérieur de la section de séchage. Cinq formes d'exécution sont décrites.

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