EP3832011A1 - Durchlufttrocknungshaube - Google Patents

Durchlufttrocknungshaube Download PDF

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Publication number
EP3832011A1
EP3832011A1 EP20211192.8A EP20211192A EP3832011A1 EP 3832011 A1 EP3832011 A1 EP 3832011A1 EP 20211192 A EP20211192 A EP 20211192A EP 3832011 A1 EP3832011 A1 EP 3832011A1
Authority
EP
European Patent Office
Prior art keywords
drums
drying
air flow
sheet
inlet
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
Application number
EP20211192.8A
Other languages
English (en)
French (fr)
Other versions
EP3832011C0 (de
EP3832011B1 (de
Inventor
Marco Cattani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toscotec SpA
Original Assignee
Toscotec SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toscotec SpA filed Critical Toscotec SpA
Publication of EP3832011A1 publication Critical patent/EP3832011A1/de
Application granted granted Critical
Publication of EP3832011C0 publication Critical patent/EP3832011C0/de
Publication of EP3832011B1 publication Critical patent/EP3832011B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D21F5/182—Drying webs by hot air through perforated cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders

Definitions

  • the present invention relates to the field of tissue paper production by means of systems with through air drying (TAD) type sections.
  • TAD through air drying
  • the invention relates to a drying section which includes a single TAD hood arranged above a certain number of drums, for example 3 or 5. More in particular, the invention relates to a TAD drying hood provided with an adjustable air flow profiling device located in the TAD hood.
  • TAD systems are based on drying a wet sheet of paper by passing hot air through the sheet and a sheet support canvas carried by one or more drying drums, such that the hot air removes the water contained in the paper.
  • the hot air flow is affected by the permeability of both the sheet and the support canvas.
  • the permeability increases, whereby preferential hot air passage zones can be created, thereby locally increasing the drying.
  • the permeability is lower, less hot air passes through and the drying effect is reduced.
  • flow profiling devices In order to improve the uniformity of the moisture profile, flow profiling devices are known, called “profiling dampers” placed in the outlet zone and which allow to vary and control the outflow of the hot humid air produced by the passage through the drums and the paper.
  • a known type of system also involves the use of dampers called “sliding dampers” which allow to vary the features of the air flow downstream of the drum.
  • WO2006020300 which includes a single drum placed inside an air treatment system structured so as to make hot air flow inside the drum, where the air flows are kept divided by disks which create bulkheads.
  • the individual flows are then controlled by the baffles or profiling dampers.
  • the known single-drum systems have some drawbacks, in particular in relation to structural complexity, and therefore the cost of the drums used, and the energy efficiency of the paper drying system, due to the path followed by the sheet of paper through the hood.
  • a first object of the present invention is therefore to improve the efficiency of the paper drying process, reducing the complexity of the drums used.
  • a further object of the invention is to be able to locally vary the pressure drop of the drying air flow in the TAD hood, so as to be able to correct any deviations from the moisture profile uniformity of the paper.
  • deviators are also provided at the outlet of the hood, crossed by independent air flows passing through a defined number of independent and externally controllable adjustable channels known as dampers.
  • a first advantage of the invention consists in the smaller size and constructional complexity of the single drum with the same length of the paper section in contact with the drums.
  • a second advantage consists in the possibility of separating the through air flows of the drums.
  • a further advantage consists in the coil shape of the trajectory followed by the paper in contact with the drums which allows a more efficient drying action of the hot air flow crossing the paper layer, due to the fact that in the system of the invention the air flow always crosses the thickness of the paper in the same direction, but the paper follows a path which leads it to curve first in one direction and then in the other. This alternating curving allows to "open” or alternately stretch the fibres located on the upper layer and, then, on the lower layer of the sheet. The air flow therefore reaches the fibres more effectively (and efficiently) throughout the thickness.
  • a further advantage is that the efficiency of the TAD hood is improved because the use of the coiled path through a plurality of drums allows to increase the length of the stretch of paper actually affected by the hot through air flow and to obtain a longer length of passing through the hood without having to create large drums, very complex and expensive to make and characterized by a lower efficiency due to the greater influence of the on-board disturbance effects.
  • a further advantage is that the profiling device of the invention provided with baffles or adjustable profiling dampers allows to adjust air flows and therefore the moisture profile along the width of the paper acting on the dampers of the profiling device from the outside.
  • adjustable baffles in combination with the presence of flow separators both in and out of the drums, guarantee the possibility of adjusting the hot air flows both in the feed direction of the sheet and along the width of the sheet itself.
  • a further advantage consists in the possibility to automatically adjust the moisture profile by installing in-line quality control systems (QCS) and controlled actuators on the dampers, for example electro-pneumatic.
  • QCS quality control systems
  • controlled actuators for example electro-pneumatic.
  • TAD through air drying hood
  • the hood TAD comprises an inlet section 1 of a drying hot air flow intended to pass through the sheet 6, coming from an air treatment apparatus AS of the type known per se and generally comprising a pipe 20 for the passage of hot air produced by a hot air source, for example a burner 21, which may be provided with one or more devices 22 to improve the uniformity of the air flow, consisting for example of mixing chambers.
  • a hot air source for example a burner 21, which may be provided with one or more devices 22 to improve the uniformity of the air flow, consisting for example of mixing chambers.
  • the hot air source may be a steam battery or other suitable system, for example electric or cogeneration.
  • the hood further comprises an inlet 5 of a continuous sheet 6 of paper to be dried which, according to the invention, is passed, in coupling to a support canvas 26, following a coiled trajectory through at least two cylindrical drying drums.
  • three drums 3, 4, 5 are provided located downstream of the inlet 1 of the drying air flow, preferably comprised between at least two sealing rollers 16, 17 arranged upstream and downstream of said drums in the feed direction of the sheet 6.
  • the use of 3 drums allows to extend a coil of a more articulated shape and greater exposure length of the paper to the hot air flow.
  • the drums 3, 4, 5 are permeable to the passage of air, for example perforated cylinders, and are arranged inside the hood TAD parallel to each other and with the rotation axis orthogonal to the inlet direction of the hot air flow, indicated with ascending undulating arrows in figure 2 .
  • the drums are each crossed by the air flow entering through a first cylindrical surface passage portion 12 of a drum and exiting the opposite cylindrical surface portion 13 of the drum.
  • the first cylindrical passage portion wrapped by the sheet 6 may be at the bottom or top of the drums.
  • the sheet since the drums are wrapped by the sheet 6 at alternately opposite cylindrical portions 12, 13 of adjacent drums, the sheet follows a coiled trajectory between the inlet 5 and the outlet 14.
  • the alternating bending of the sheet wrapped on the drums allows to "open” or alternately stretch the fibres placed on the upper layer and on the lower layer of the sheet, with the consequence that the air flow reaches the fibres more effectively through the entire thickness of the sheet.
  • the drums have parallel axes offset vertically, but it is understood that they can be arranged in line according to application needs.
  • the hood TAD Downstream of the drums 3-5, the hood TAD is lastly provided with an outlet section 8 of the drying air flow.
  • the outlet section 8 comprises an air flow profiling device 9 by means of passage channels 10 adjusted by corresponding baffles 11, for example a plurality of individually movable baffles controllable also from the outside of the hood which, in a preferred embodiment, are arranged to adjust the air flow both along the feed direction of the sheet and in the axial extension direction of the drums.
  • baffles 11 for example a plurality of individually movable baffles controllable also from the outside of the hood which, in a preferred embodiment, are arranged to adjust the air flow both along the feed direction of the sheet and in the axial extension direction of the drums.
  • the paper in the inlet side of the drum has a lower degree of dryness (for example of 20%-25%); proceeding towards the outlet, the degree of dryness gradually increases until reaching the desired values (for example 60%-85%, depending on the overall energy balances of the machine).
  • the hood may further comprise second flow separators 19 arranged downstream of the drums arranged to define at least two separate air passage sectors 24 in the outlet section 8.
  • the separators 19 allow air flows with different degrees of moisture to be kept separate, so as to allow a more effective management of the air flows possibly to be re-circulated and, in part, eliminated from the air treatment circuit.
  • two or more air inlet zones 27 are provided, preferably separated by one or more inlet separators 18, for example sheet metal sheets, arranged upstream of the drums 3-5.
  • inlet separators 18 for example sheet metal sheets, arranged upstream of the drums 3-5.
  • the incoming air flows in the zones 27 therefore pass through the drums and reach the sectors 24 defined by the upper separators or bulkheads 19 after passing through the controlled baffles 11.
  • the baffles 11 in the different zones or sectors 24 are independently adjustable with a multiplicity of baffles 11 independently controlled and shown with circles in fig. 3 .
  • the individually movable baffles 11 are controllable from the outside by means of control devices preferably consisting of rods 25 acting on a kinematic mechanism 28 (one rod and one kinematic mechanism for each baffle): advancing or retracting the rod, so that the baffle 11 rotates on the axis 29 thereof, opening or closing the air passage.
  • control devices preferably consisting of rods 25 acting on a kinematic mechanism 28 (one rod and one kinematic mechanism for each baffle): advancing or retracting the rod, so that the baffle 11 rotates on the axis 29 thereof, opening or closing the air passage.
  • the movement of the rod may be manual or automatic.
  • the rods 25 emerge from the upper hood laterally to be accessible by an operator and can be adjusted from the outside even with the system in operation.
  • the baffles 11 are suitably adjusted to compensate for the formation of preferential flows whose presence would cause problems of moisture uniformity in the paper produced along the width of the sheet.

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  • Paper (AREA)
EP20211192.8A 2019-12-04 2020-12-02 Durchlufttrockner Active EP3832011B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000022920A IT201900022920A1 (it) 2019-12-04 2019-12-04 Cappa di essiccazione ad attraversamento di flusso

Publications (3)

Publication Number Publication Date
EP3832011A1 true EP3832011A1 (de) 2021-06-09
EP3832011C0 EP3832011C0 (de) 2025-01-08
EP3832011B1 EP3832011B1 (de) 2025-01-08

Family

ID=70154900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20211192.8A Active EP3832011B1 (de) 2019-12-04 2020-12-02 Durchlufttrockner

Country Status (2)

Country Link
EP (1) EP3832011B1 (de)
IT (1) IT201900022920A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956832A (en) * 1974-09-13 1976-05-18 Beloit Corporation Web dryer arrangement
US20050204580A1 (en) * 2004-03-19 2005-09-22 Metso Paper Karlstad Aktiebolag (Ab) Apparatus for conditioning a fabric in a papermaking machine and associated method
WO2006020300A2 (en) 2004-07-30 2006-02-23 Metso Paper Usa, Inc. Flow and profile control treating permeable webs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956832A (en) * 1974-09-13 1976-05-18 Beloit Corporation Web dryer arrangement
US20050204580A1 (en) * 2004-03-19 2005-09-22 Metso Paper Karlstad Aktiebolag (Ab) Apparatus for conditioning a fabric in a papermaking machine and associated method
WO2006020300A2 (en) 2004-07-30 2006-02-23 Metso Paper Usa, Inc. Flow and profile control treating permeable webs

Also Published As

Publication number Publication date
IT201900022920A1 (it) 2021-06-04
EP3832011C0 (de) 2025-01-08
EP3832011B1 (de) 2025-01-08

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