EP0154251A2 - Procédé et dispositif pour conditionner des produits en papier sous forme de pile - Google Patents

Procédé et dispositif pour conditionner des produits en papier sous forme de pile Download PDF

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Publication number
EP0154251A2
EP0154251A2 EP85101822A EP85101822A EP0154251A2 EP 0154251 A2 EP0154251 A2 EP 0154251A2 EP 85101822 A EP85101822 A EP 85101822A EP 85101822 A EP85101822 A EP 85101822A EP 0154251 A2 EP0154251 A2 EP 0154251A2
Authority
EP
European Patent Office
Prior art keywords
stack
vacuum
vacuum chamber
chamber
temperature
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.)
Withdrawn
Application number
EP85101822A
Other languages
German (de)
English (en)
Other versions
EP0154251A3 (fr
Inventor
Jorge Dr. Rodriguez-Giles
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.)
Mohndruck Reinhard Mohn oHG Firma
MOHNDRUCK GRAPHISCHE BETRIEBE GmbH
Original Assignee
Mohndruck Reinhard Mohn oHG Firma
MOHNDRUCK GRAPHISCHE BETRIEBE GmbH
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 Mohndruck Reinhard Mohn oHG Firma, MOHNDRUCK GRAPHISCHE BETRIEBE GmbH filed Critical Mohndruck Reinhard Mohn oHG Firma
Publication of EP0154251A2 publication Critical patent/EP0154251A2/fr
Publication of EP0154251A3 publication Critical patent/EP0154251A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/02—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by dampening

Definitions

  • the invention relates to a method for conditioning stacks of paper products and an apparatus, in particular for carrying out the method according to the preamble of claims 1 and 9.
  • the paper For processing paper products, e.g. before or after printing, the paper must have a suitable moisture content of about 5 to 6% by weight.
  • the paper product is not in the form of a sheet, but rather as a stack of sheets, conditioning the stacks to the desired moisture content has not hitherto been possible, since the superheated steam only moistens the edge regions of the stack, so that the inside of the stack remains dry.
  • the desired conditioning of paper sheet stacks is advantageously achieved within a short time.
  • the invention provides that the air from the chamber and the cavities in an airtight chamber the paper and the stack is removed. This provides free cavities into which water vapor can penetrate (diffusion). Since the area surrounding the stack in the chamber is also almost empty of air, due to the moisture absorption of the paper, there is an unimpeded flow of water vapor to the stack and then diffusion into the stack or into the cavities of the paper.
  • the invention further provides that first a higher temperature is generated in an edge zone, which is above the stack temperature and possibly the ambient temperature, so that there is a temperature gradient (AT) both to the surroundings of the stack and to the adjacent inner zone of the stack .
  • the higher temperature is preferably generated by the heat of condensation and binding of the water vapor itself. This adsorption of moisture releases heat that heats the peripheral zone.
  • the correct initial ambient and stacking temperature which are preferably approximately the same, surprisingly, due to the high temperature of the peripheral zone, an equilibrium moisture content in the zone very quickly arises, which corresponds to the desired equilibrium moisture content of the paper at room temperatures and Corresponds to normal atmospheres.
  • the water vapor flow to the stack and diffusion into the stack is maintained after saturation of the edge zone, because the neighboring inner zones adsorb water vapor after saturation of the edge zone, heat up to approximately the same temperature as the edge zone and become saturated with moisture. This heating and diffusion process continues rapidly until the core of the stack is saturated with water.
  • the stack is preferably covered at the top and bottom with wooden plates or a similar, diffusion-preventing, temperature-insulating material, so that the diffusion of the water vapor only from the free Sheet edges starting from.
  • a vacuum of between 1 and 30, preferably between 1 and 10, torr is preferably generated, and ambient temperatures in the vacuum chamber are set between 10 and 40, preferably between 15 and 30 ° C.
  • the temperature of the edge zone of the stack is set between 10 and 30 ° C higher than the ambient temperature, so that the dew point of water vapor is not fallen below.
  • Conditioning in The vacuum chamber is preferably carried out between 4 and 24 hours, after which the normal atmosphere is set within a short time, preferably between 10 and 40 ° C. and 50 to 60 K relative atmospheric humidity.
  • the stack then has a higher temperature than the surrounding atmosphere. However, the conditioning is not lost when it cools down.
  • Advantageous process parameters are characterized in subclaims 2 to 8, with which an optimization of the conditioning is achieved taking into account the stack size and the paper quality.
  • a device, in particular for performing the method described, is characterized in claims 9 to 13.
  • the new device has a simple structure, wherein a single vacuum pump can be used to evacuate several vacuum chambers.
  • a stack 12 of printed or unprinted paper sheets with ambient temperature is introduced into a vacuum chamber 10.
  • the stack is placed on a platform 36 arranged at a distance from the bottom 20 of the vacuum chamber 10, which preferably consists of a wooden plate 9 covering the stack from below, on which the stack rests, that the sheet edges point to the side, qbearing.
  • the stack is preferably covered with a wooden plate 9a from above.
  • the plates are intended to prevent the penetration of water vapor from top to bottom and have a heat-insulating effect, ie they should also ensure that the temperature increase caused by the adsorption is retained.
  • the vacuum chamber 10 is closed in a pressure-tight manner and a high vacuum of approximately 1 to 30 torr is applied by means of a vacuum pump 14.
  • the vacuum line 16 is closed by means of a pressure control device 28 described below.
  • Water or ambient temperature is introduced into the vacuum chamber 10 via a water supply 24 opening into the floor 20 now or before the vacuum valve 18 is closed.
  • the maximum water level in the vacuum chamber 10 lies below the platform 36 in order to prevent direct moistening of the stack 12 and is regulated by means of a level controller 32 described further below.
  • the amount of water supplied depends on the size of the stack 12 and the vacuum present, but is not critical for the conditioning process as long as there is sufficient water and the water does not come into direct contact with the stack 12.
  • the water evaporates, so that the vacuum chamber 10 fills with water vapor 40, preferably saturated steam. Due to the initially marginal adsorption of water vapor by the paper in the stack 12, a zone of increased moisture is formed in a boundary layer 38 around the stack 12, which zone is caused by a condensation of the steam 40, the temperature in the boundary layer 38 depending on Operating conditions increase to about 30 to 50 ° C.
  • the rest of the stack 12 further includes a temperature of, for example having about 20 0 C, a temperature gradient is formed in the direction of the pile core 42nd
  • the water vapor penetrates the saturated edge zone almost unhindered and condenses in the adjacent area until the same temperature is reached as at the edge zone, which results in saturation with 5 to 6% by weight of water.
  • This process continues up to core 42.
  • a measuring device arranged in the stack core 42 for example a temperature measuring device, or on the basis of tests, the end of the conditioning process can be determined, ie the point in time after which the stack 12 has reached the desired moisture increase up to the stack core 42.
  • Atmospheric pressure is then restored via a ventilation valve 34 in the vacuum chamber 10 and the chamber 10 is opened and ambient conditions are set (10 to 40 ° C., 50 to 60% relative humidity).
  • FIG. 3 A device in particular for performing the method is shown in FIG. 3.
  • the device essentially consists of a plurality of vacuum chambers 10 arranged parallel to one another, a vacuum pump 14 connected via pipes 16 to the vacuum chambers 10 and one via Pipelines 44 with the water supply 46 connected to the vacuum chambers 10.
  • the vacuum chambers 10 have a pressure-tightly closable feed opening 26, for example in the form of a cover, and a platform 36 arranged at a distance from the floor 20 for storing the paper stack 12.
  • the platform 36 preferably consists of a wooden plate 9 in order to prevent moistening of the stack 12 from its underside and to maintain the temperature increase.
  • a vacuum line 16 and a water supply line 44 each open into the bottom 20 of each vacuum chamber 10. Furthermore, a ventilation valve 34 and a control device are provided on each vacuum chamber 10.
  • the control device expediently comprises a pressure regulator 28 and a level regulator 32 and a temperature display 48.
  • the pressure regulator 28 opens the vacuum valve 18 in the vacuum line 16 of the next vacuum chamber 10.
  • P 2 the pressure regulator 28 opens the valve 30 in the water line 44
  • P 3 it closes the vacuum valve 18 in the vacuum line 16 to the first vacuum chamber 10 in order to ensure a continuous process sequence.
  • a corresponding control device is provided on each of the vacuum chambers 10, so that when the last vacuum chamber is evacuated when the pressure P 1 is reached, the vacuum valve 18 to the first vacuum chamber 10 is opened and the process begins again.
  • By opening the valve 30 in the water supply 44 water is supplied to the bottom 20 of the vacuum chamber 10.
  • the level controller 32 monitors the water level and closes the valve 30 in the water supply line 44 when a predetermined water level is reached.
  • a corresponding switch-off device for the vacuum pump 14 is also provided, which switches the pump off when it is not required.
  • a moisture measuring device arranged in the stack core 42 offers the possibility of a further refinement of the regulation of the method, for example by controlling the ventilation valve 34 for each vacuum chamber 10 starting from the moisture measuring device.
  • a paper stack with a residual moisture of 2 to 2.5% a.F. ( 10% RH at 20 ° C) in a vacuum chamber with a vacuum of about 5 Torr.
  • the dampening water temperature was about 20 to 30 C.
  • a temperature increase of up to 50 ° C was measured in the paper stack. After a treatment period of 24 hours, an increase in moisture of 2 to 3% a.F. (approx. 50% RH at 20 ° C) reached.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
EP85101822A 1984-03-08 1985-02-20 Procédé et dispositif pour conditionner des produits en papier sous forme de pile Withdrawn EP0154251A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3408495 1984-03-08
DE19843408495 DE3408495A1 (de) 1984-03-08 1984-03-08 Verfahren und vorrichtung zur konditionierung von im stapel angeordneten papierprodukten

Publications (2)

Publication Number Publication Date
EP0154251A2 true EP0154251A2 (fr) 1985-09-11
EP0154251A3 EP0154251A3 (fr) 1986-04-23

Family

ID=6229910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101822A Withdrawn EP0154251A3 (fr) 1984-03-08 1985-02-20 Procédé et dispositif pour conditionner des produits en papier sous forme de pile

Country Status (2)

Country Link
EP (1) EP0154251A3 (fr)
DE (1) DE3408495A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0706883A1 (fr) * 1994-10-13 1996-04-17 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Procédé et dispositif pour mouillage d'une bande de papier
CN108999029A (zh) * 2018-07-30 2018-12-14 长葛市大阳纸业有限公司 一种接装纸原料纸存放的装置和接装纸原料纸保存的方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT391721B (de) * 1986-12-30 1990-11-26 Republik Oesterreich Diese Ver Verfahren und vorrichtung zur konservatorischen behandlung von papier
DE19721707C2 (de) * 1997-05-23 1999-04-01 Becker Preservotec Gmbh Verfahren zum Trocknen von Papier

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH99512A (de) * 1922-04-04 1923-06-01 Fankhauser & Kapp Verfahren zum Anfeuchten von Tabakballen.
FR810187A (fr) * 1935-10-09 1937-03-17 Thermal Engineering Corp Procédé de traitement du tabac
US2856697A (en) * 1955-06-22 1958-10-21 Fruth Hal Frederick Method of loosening and conditioning a stack of sheets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH99512A (de) * 1922-04-04 1923-06-01 Fankhauser & Kapp Verfahren zum Anfeuchten von Tabakballen.
FR810187A (fr) * 1935-10-09 1937-03-17 Thermal Engineering Corp Procédé de traitement du tabac
US2856697A (en) * 1955-06-22 1958-10-21 Fruth Hal Frederick Method of loosening and conditioning a stack of sheets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0706883A1 (fr) * 1994-10-13 1996-04-17 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Procédé et dispositif pour mouillage d'une bande de papier
US5618584A (en) * 1994-10-13 1997-04-08 Koenig & Bauer-Albert Aktiengesellschaft Method and apparatus for damping a paper web
CN108999029A (zh) * 2018-07-30 2018-12-14 长葛市大阳纸业有限公司 一种接装纸原料纸存放的装置和接装纸原料纸保存的方法

Also Published As

Publication number Publication date
DE3408495A1 (de) 1985-09-12
EP0154251A3 (fr) 1986-04-23

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Inventor name: RODRIGUEZ-GILES, JORGE, DR.