EP2220292A1 - Procédé de production continue de papier absorbant et dispositif utilisé dans ledit procédé - Google Patents
Procédé de production continue de papier absorbant et dispositif utilisé dans ledit procédéInfo
- Publication number
- EP2220292A1 EP2220292A1 EP08848582A EP08848582A EP2220292A1 EP 2220292 A1 EP2220292 A1 EP 2220292A1 EP 08848582 A EP08848582 A EP 08848582A EP 08848582 A EP08848582 A EP 08848582A EP 2220292 A1 EP2220292 A1 EP 2220292A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- belt
- felt
- paper sheet
- wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010924 continuous production Methods 0.000 title claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 19
- 230000006835 compression Effects 0.000 claims abstract description 4
- 238000007906 compression Methods 0.000 claims abstract description 4
- 238000005516 engineering process Methods 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000000725 suspension Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/14—Making cellulose wadding, filter or blotting paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
Definitions
- the present invention refers to the field of processes and devices for the continuous production of tissue paper. State of the art
- systems for the manufacture of tissue paper comprise large very complex machines for continuous production, starting from preparation of the suspension of fibres (normally cellulose) right through to the finished sheet. After preparation of the suspension of fibres, the main machine, i.e. the continuous paper machine, takes over the process.
- the main machine i.e. the continuous paper machine
- the work of the continuous machine consists basically of two phases: formation of the sheet and drying of the sheet formed.
- formation of the sheet and drying of the sheet formed.
- crescent former the method most commonly used today
- twin wire twin wire
- the suspension of fibres (normally suspensions of cellulose in water with density below 1% in weight) is uniformly distributed on a forming wire belt; this consists of a loop of very strong synthetic material which is kept constantly tightly tensioned and rotates at the set speed on steel cylinders which keep it tensioned and move or guide it.
- the forming wire has a filtering surface which permits the drainage of large amounts of water and therefore the formation of a paper sheet containing 10 - 20% in weight of paper, depending on the particular method used. In the subsequent drying phase, the paper sheet thus obtained is transferred onto a belt made of felt.
- an additional wire belt called transport belt is positioned between the forming wire belt and the felt (below, the generic definition "wire belt” will be used for the sake of simplicity to indicate both types of wire belt specified above).
- the sheet is formed on the forming cylinder, as described previously, between the two wire belts, i.e. the forming and the transport belt; the second one conveys the sheet formed over a short distance, passing it on to the felt.
- the felt that conveys the paper sheet (received from the forming belt or transport belt depending on the method used as described above) along its path is then pressed by a rubber-coated cylinder (called suction or press cylinder, which normally has a surface provided with holes and is connected to one or more suction pumps) against a second metal cylinder, much bigger and heated, called Yankee cylinder, so as to remove a further quantity of water, leaving the sheet adhering to the hot metal surface of the metal cylinder which then transfers it to the cylinders for winding in large rolls.
- suction or press cylinder which normally has a surface provided with holes and is connected to one or more suction pumps
- Yankee cylinder much bigger and heated
- the felt is a loop made of very strong synthetic material which is a very heavy woven fabric kept constantly tightly tensioned and rotating at the set speed on steel guide cylinders.
- the forming belt in the case of the crescent former method or the sheet transport belt in the case of the twin-wire method and the felt are in contact for a certain length and as soon as the sheet is transferred to the felt, the belts separate and the sheet proceeds towards the drying phase.
- the process has the disadvantage, however, that the paper sheet arrives at the drying phase on the Yankee cylinder still containing a fairly large amount of water and therefore requires, for drying, the application of a considerable pressure by the rubber-coated cylinder against the Yankee cylinder which negatively affects the softness and absorption capacity of the fibres in the finished sheet.
- Figures 1 (a) and (b) show schematically a particular embodiment of the process according to the invention
- figure 2 shows schematically a further particular embodiment of the process according to the invention
- figure 3 shows schematically, for comparison, the process of Figure 1 according to the state of the art in which the crescent former technology is used
- figure 4 shows schematically, for comparison, the process of Figure 2 according to the state of the art in which the twin-wire technology is used.
- the present invention overcomes the above-mentioned problems permitting a reduction in the concentration of water in the sheet prior to the drying phase by means of a process for the continuous production of tissue paper in which before said phase, the paper sheet, positioned between wire belt (forming or transport according to the technology used) and felt is passed over one or more cylinders so that the belt positioned outside the cylinder(s) is able to exert a uniform pressure against the other belt and against the cylinder itself with which it is in contact, so that the paper sheet, positioned between the two belts, releases to the felt a part of the water contained up to that point in its component fibres.
- Figure 3 illustrates the known process applied to a continuous machine with crescent former technology (the most widespread method used today for the continuous production of tissue paper) but it can obviously be applied in the same way to the other technologies used for continuous production of paper sheets (such as the already mentioned twin-wire technology).
- the paper sheet forms on the forming cylinder 10 which is wrapped by an angle of approximately 150° - 180° by the felt 11 and, outside the latter, by approximately 120° - 150° by the forming wire 12 hence the forming wire adheres to the felt in the part where the latter rests on the forming cylinder.
- the jet 14 of suspension of fibres (normally below 1% in weight of fibres) which comes out (at approximately the speed of the forming wire and the felt) of the headbox 15 is directed into the slice 13, located between the forming wire 12 and the felt 11.
- the forming wire separates, in point A, from the paper sheet which continues its route, adhering to the felt until it meets the press cylinder 17.
- the forming cylinder 10 is wrapped, in a substantially analogous manner to that illustrated previously, by two wires, one of which acts as a forming belt 12 and the other as a transport belt 12' which conveys the sheet formed over a short distance, transferring it from the forming belt 12 to the felt 11 on which the process continues as described for the preceding technology.
- the forming belt, the felt and the paper sheet positioned between them pass over the forming cylinder and proceed together as far as one or more cylinders 22 (the figure shows two) positioned between the forming cylinder and the press cylinder, so that the forming belt or the felt are positioned in contact with the first cylinder (if there are more than one) (and vice versa when the belt passes over the second cylinder and so on if further cylinders are provided) and the belt on the outside of each cylinder exerts a uniform pressure on the fibres of the sheet; in this way there is a further release of water to the felt, thus increasing the degree of dryness (density of the fibres) of the paper being formed and improving the characteristics of the paper sheet.
- the two figures show, for maximum clarity, two possible arrangements of the cylinder such that in one case (Figure 1 (a)) it is the wire that rests on the first cylinder while in the other ( Figure 1 (b)) it is the felt that rests on the first cylinder (obviously in both cases the positions of wire and felt are inverted on the second cylinder and so on if there are other cylinders); other positions of the cylinder(s) according to the invention are obviously possible, on condition that they are intermediate, between forming and drying, according to the geometry of the machines used and the relative paths of the belts.
- FIG. 2 shows the process according to the invention in the case of application of the double-wire technology.
- the present invention furthermore refers to a device for machines for the continuous production of tissue paper, consisting of one or more cylinders arranged in succession, in any position between the forming cylinder and the press cylinder, so that said one or more cylinders are able to receive the wire belt, the felt and the paper sheet between them, allowing the outermost belt to exert a uniform pressure against the other belt and against the cylinder with which the latter is in contact, thus compressing the fibres of the paper sheet between the two belts.
- the invention also refers to machines for the continuous production of tissue paper equipped with the above-mentioned device and the sheet of tissue paper continuously produced according to the process described above.
Landscapes
- Paper (AREA)
- Sanitary Thin Papers (AREA)
Abstract
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL08848582T PL2220292T3 (pl) | 2007-11-12 | 2008-11-11 | Sposób ciągłego wytwarzania bibułki i urządzenie stosowane we wspomnianym sposobie |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000256A ITFI20070256A1 (it) | 2007-11-12 | 2007-11-12 | Processo per la produzione di carta tissue in continuo e dispositivo utilizzato in detto processo. |
PCT/IB2008/054714 WO2009063396A1 (fr) | 2007-11-12 | 2008-11-11 | Procédé de production continue de papier absorbant et dispositif utilisé dans ledit procédé |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2220292A1 true EP2220292A1 (fr) | 2010-08-25 |
EP2220292B1 EP2220292B1 (fr) | 2017-08-02 |
Family
ID=40314622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08848582.6A Not-in-force EP2220292B1 (fr) | 2007-11-12 | 2008-11-11 | Procédé de production continue de papier absorbant et dispositif utilisé dans ledit procédé |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2220292B1 (fr) |
HU (1) | HUE033176T2 (fr) |
IT (1) | ITFI20070256A1 (fr) |
PL (1) | PL2220292T3 (fr) |
WO (1) | WO2009063396A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2692119T3 (es) | 2014-05-15 | 2018-11-30 | ICONè S.R.L. | Sección de formador y método para producir papel |
AT517330B1 (de) | 2015-10-06 | 2017-01-15 | Andritz Ag Maschf | Verfahren zur herstellung einer faserstoffbahn |
DE102019123811A1 (de) * | 2019-09-05 | 2021-03-11 | Voith Patent Gmbh | Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1245727A1 (fr) * | 2001-03-26 | 2002-10-02 | A. CELLI S.p.A | Procédé et dispositif pour la fabrication d' une bande de papier |
DE102005036891A1 (de) * | 2005-08-05 | 2007-02-08 | Voith Patent Gmbh | Maschine zur Herstellung von Tissuepapier |
DE102005039015A1 (de) * | 2005-08-18 | 2007-02-22 | Voith Patent Gmbh | Verfahren zur Herstellung von Tissuepapier |
-
2007
- 2007-11-12 IT IT000256A patent/ITFI20070256A1/it unknown
-
2008
- 2008-11-11 HU HUE08848582A patent/HUE033176T2/en unknown
- 2008-11-11 WO PCT/IB2008/054714 patent/WO2009063396A1/fr active Application Filing
- 2008-11-11 PL PL08848582T patent/PL2220292T3/pl unknown
- 2008-11-11 EP EP08848582.6A patent/EP2220292B1/fr not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2009063396A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2220292B1 (fr) | 2017-08-02 |
WO2009063396A1 (fr) | 2009-05-22 |
PL2220292T3 (pl) | 2018-01-31 |
ITFI20070256A1 (it) | 2009-05-13 |
HUE033176T2 (en) | 2017-11-28 |
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