Method for producing bag paper, bag paper and paper bag

The method comprises producing a bag paper web (2) in a paper machine (3), which comprises a headbox on a sieve, a drainage in a press and a dryer in a drying section, and then winding the bag paper web using a coil (8). The bag paper web is treated in an extended nip calender at the end or after th...

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Bibliographische Detailangaben
Hauptverfasser:	RHEIMS, JOERG, ROTHFUSS, ULRICH
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACCESSORIES FOR PAPER-MAKING MACHINES ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR CALENDERS CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS CONVEYING HANDLING THIN OR FILAMENTARY MATERIAL IMPREGNATING OR COATING OF PAPER MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNERANALOGOUS TO PAPER MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN AMANNER ANALOGOUS TO PAPER MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD ORMATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER METHODS OF PRODUCING PAPER THEREON PACKAGES PACKAGING ELEMENTS PACKING PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PAPER-MAKING MACHINES PERFORMING OPERATIONS PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS STORING TEXTILES TRANSPORTING TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER
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Beschreibung
Zusammenfassung:	The method comprises producing a bag paper web (2) in a paper machine (3), which comprises a headbox on a sieve, a drainage in a press and a dryer in a drying section, and then winding the bag paper web using a coil (8). The bag paper web is treated in an extended nip calender at the end or after the paper machine, and is treated before winding in the extended nip calender. The bag paper web compresses around 5% in the running direction with a dry content of 40-80%. The extended nip calender impinges with a flexible cover over a shoe roller or a flexible rotating belt (14) impinges the web. The method comprises producing a bag paper web (2) in a paper machine (3), which comprises a headbox on a sieve, a drainage in a press and a dryer in a drying section, and then winding the bag paper web using a coil (8). The bag paper web is treated in an extended nip calender at the end or after the paper machine, and is treated before winding in the extended nip calender. The bag paper web compresses around 5% in the running direction with a dry content of 40-80%. The extended nip calender impinges with a flexible cover over a shoe roller or a flexible rotating belt (14) impinges the web with a pressing pressure. A first web side lying on a smoothed and heated roller with the extended nip calender is smoothed to a pulse-per-second (PPS) value of below 7 mu m. The first web side lying on a smoothed and heated roller with the extended nip calender is smoothed to a pulse-per-second (PPS) value ratio of over 1.4 from in running direction before the extended nip calender to in running direction of the web behind the extended nip calender. The web with the extended nip calender is compressed to maximum 15% from in running direction before the extended nip calender to in running direction of the web behind the extended nip calender. The extended nip calender impinges the uncompressed bag paper with a maximum pressing pressure of 5-20 MPa over a flexible counter pressure element and the compressed bag paper with a pressing pressure of 2-5 MPa. The pressing pressure of the extended nip calender is adjusted, so that Gurley-porosity of the compressed bag paper remains to a value below 7 seconds and Gurley-porosity of the uncompressed bag paper remains to a value below 30 seconds. The extended nip calender is operated, so that the value of the Gurley-porosity of the web in the extended nip calender increases to maximum 50%. The surface of the heated roller has a temperature of 18