EP1046500B1 - Cooling and remoistening unit for rotary presses - Google Patents

Cooling and remoistening unit for rotary presses Download PDF

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Publication number
EP1046500B1
EP1046500B1 EP20000106010 EP00106010A EP1046500B1 EP 1046500 B1 EP1046500 B1 EP 1046500B1 EP 20000106010 EP20000106010 EP 20000106010 EP 00106010 A EP00106010 A EP 00106010A EP 1046500 B1 EP1046500 B1 EP 1046500B1
Authority
EP
European Patent Office
Prior art keywords
cooling
rolls
arranged
conditioning unit
material web
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.)
Not-in-force
Application number
EP20000106010
Other languages
German (de)
French (fr)
Other versions
EP1046500A1 (en
Inventor
Clemens Johannes Maria De Vroome
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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
Priority to DE1999118130 priority Critical patent/DE19918130A1/en
Priority to DE19918130 priority
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP1046500A1 publication Critical patent/EP1046500A1/en
Application granted granted Critical
Publication of EP1046500B1 publication Critical patent/EP1046500B1/en
Anticipated expiration legal-status Critical
Application status is Not-in-force legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F23/00Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0476Cooling
    • B41F23/0479Cooling using chill rolls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F23/00Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/02Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by dampening

Description

The present invention relates to a cooling and humidifying unit for Rotary printing machines, in particular for rotary printing machines for processing of material webs.

EP 0 627 311 B1 describes a web cooling device which uses a Has housing, which is arranged next to a dryer and a number therein contained vertically arranged rollers. A paper web, which is the dryer leaves through a slot, runs directly into the housing of the web cooling device, where it is deflected by a cooled back-up roll to which a press roll is attached so that the path of the path is substantially vertical. The paper web will then fed to a cooling roll, which they with a wrap angle of wraps around 90 °, and leaves the web cooling device in horizontal Movement. Just like the cooling roll, the cooled back-up roll is also used by the Paper web wrapped essentially with a wrap angle of about 90 °. There are also between the cooled back-up roll and the cooling roll Liquid application rollers arranged, which the paper web when passing through Moisten the web cooling device.

DE 44 35 275 A1 relates to an apparatus and a method for a Web. An apparatus for dissipating heat from a web includes one Cooling roll with a cylindrical surface. The web is moving along one Path that extends partially around the chill roll. Between the two side parts the web extends around part of the cylindrical outer surface of the cooling roll in Circumferential direction a nozzle. An air flow is counteracted through the middle part of the nozzle directed a middle part of the web and above a point where the web normally comes into contact with the chill roller around the middle part of the web bend and bring it into contact with the chill roll in this way. To Lateral nozzle parts extend on both sides of the middle part of the nozzle, namely below the point where the middle part of the web is towards the chill roll is bent. This creates a smoothing in the transverse direction and along the middle Part of the track achieved.

DE 197 10 124 A1 relates to a method and a device for temperature control of cooling rolls. The present invention relates to the cooling of a printed or coated material web, which in particular according to the offset printing process was printed and consists of paper. The material web has after applying Color passes through a heating zone and is passed over a variety of cooling rolls Cooling roll stand led. The flow of the cooling medium through the cooling rollers a cooling roll stand by two different cooling circuits different Temperature levels generated and against the direction of travel of a material web over the Cooling rollers directed. In this embodiment, the cooling rolls are more conventional Wise arranged quite a lot of construction and floor space and only two of the Cooling rollers are arranged one above the other.

EP 0 627 311 B1 relates to a web cooling device. The device according to This publication allows cooling one in a dryer Web printing machine heated printing material web with a downstream of the dryer and the support roller or turning device guiding the printing material web. By means of a second downstream of the support roller or turning device and the printing material web leading roller with a first liquid application roller for applying liquid on a first side of the printing material web and a second liquid application roller to apply liquid to a second side of the substrate. The Liquid application rollers are on opposite sides of the Printing material web between the support roller or the turning device and the second Roller arranged. According to the disclosed device, the liquid application rollers are together one between the support roller or turning device and the second roller assigned to the printing substrate web section and offset from one another. They create a pressure contact along a contact surface on the substrate in the Way that the substrates can be wetted.

By means of this solution, however, according to EP 0 627 311 B1, only one can limited number of cooling rolls are taken up in one cooling roll stand, whereby the cooling effectiveness of the device remains limited, resulting in a low Temperature at which a cooled material web the device according to EP 0 627 311 B1 should leave is difficult to reach.

In the course of the general technical development in the printing area, the Railway speeds increased steadily. This makes longer dryers and longer chill roll units have become necessary to dry the printed Material web and a cooling of the heated material web after drying inside an acceptable amount of time. From the development shown follows the problem of achieving higher printing press speeds on the one hand and on the other hand, the lengths of dryers or cooling and rewetting units within a tolerable length with regard to the expensive footprint in print shops hold.

In view of the presented solutions from the state of the art and the emerging development outlined above, the invention has for its object to significantly shorten the length of a cooling and conditioning unit and at the same time reduce the Increase cooling effectiveness.

Another object of the present invention is that in one Print shop necessary footprint for such Correct the cooling and conditioning unit considerably. After all, with the solution according to the invention a lateral run of the material web during the passage the cooling and conditioning unit can be prevented.

According to the present invention, the objects are achieved by the features of Claim 1 solved.

Of the various advantages associated with the solution according to the invention to mention in particular the saving of floor space in a printing company. Because of the essentially vertical arrangement of a plurality of cooling rolls wraps around the web, the surfaces of which are wrapped at angles of between 180 ° and 270 °, whereby a very effective heat transfer can be achieved. Because the diameter of the cooling rolls according to the invention is relatively small compared to their width, can high web tension can be maintained without the need for additional tensioning devices such as additional tensioning rollers or nozzle arrangements that increase web tension would require. Because boundary layers are almost entirely from the surfaces of the quickly moving material web could be eliminated, the construction of air cushions and the concomitant occurrence of condensation on the first cooling rolls largely avoid.

According to further refinements of the idea on which the invention is based the cooling rollers may be arranged offset from one another around the material web passing through them to impress an essentially arched path and high Realize wrap angle. The cooling rolls according to the present invention can be arranged offset from each other, both offset in height as also offset with respect to the length of the housing. Due to the staggered arrangement and applying a substantially arcuate web path high wrap angles can be achieved on the chill rolls, resulting in a particularly effective heat transfer.

Optionally, the cooling and conditioning unit according to the invention present invention comprise a conditioning unit for applying a liquid for example moisture or silicone on one or both sides of the Conditioning unit passing material web. The conditioning rollers of the Conditioning plant can be arranged opposite each other and either a common liquid container or a shared liquid container have to maintain a constant fluid supply to the aforementioned surfaces enable.

To ensure the highest possible tension during the transfer of a material web to ensure the cooling and conditioning unit have the invention Cooling rolls have a relatively small diameter in relation to their width, i. e. between 100 mm and 250 mm, preferably about 250 mm in diameter. The relatively small one Diameter of the cooling rolls according to the invention allows a high one to be maintained Traction levels between the web and the surfaces of the chill rolls, with little Air is trapped between the roll surface and the web. This in turn favors the heat transfer coefficient and enables the elimination of the Corrugation of the web across the web width during the passage of the cooling rolls in Web direction.

The arrangement of the cooling rolls according to the invention one above the other within the housing, uses its height very effectively, compared to that of the prior art known housings. Exploiting the height of such instead of its length allows a short overall length and therefore little floor space in the printing shop.

Since the cooling and conditioning unit according to the invention is relatively close to the following one Turning bar superstructure is only a small free path for the Post-evaporation of solvents is possible, which means additional post-evaporation restricted, so that the operating personnel no additional solvent pollution of the Breathing air is exposed. The cooling and conditioning unit according to the invention can be one Dryer of a rotary printing machine for both commercial and colored printing Newspaper printing must be assigned.

The invention will become more apparent in connection with the accompanying drawing 1, wherein a longitudinal section through an inventive cooling and Conditioning unit is shown.

The cooling and conditioning unit 1 according to the present invention is immediate arranged behind the outlet of a dryer. The dryer contains a corresponding one upper dryer zone and a corresponding lower dryer zone, between which there is extends a web running level. The cooling and conditioning unit 1 comprises a first one Cooling roller 8 with a diameter 24. The web 7 of either one or both sides are printed, is deflected by the first cooling roller 8 by 90 ° and follows a downwardly extending web path, which the web 7 in Web running direction 9 leads. In the further course of this downwardly extending part of the A web 11 is optionally provided for a conditioning unit, which is used for the application moisture or other fluid such as silicone on one or both Surfaces of the material web 7 allowed. The conditioning unit 11 closes two Conditioning rollers 12, which are arranged opposite one another. Each of the Conditioning rollers 12 are immersed in and conveyed from a liquid container apply a thin film of liquid to the material web. The conditioning rollers 12, either for applying moisture or for applying silicone, for example arranged opposite each other to ensure even application of the fluid allow. In the web run passage shown in FIG. 1, the material web 7 becomes a downward trajectory embossed, within the downward trajectory it is provided with said liquid film, with no web deflection between the first cooling roller 8 and a cooling roller 14 arranged further downstream comes. It is only through the cooling roller 14 that the further web path 12 becomes one again diverted upward path portion, d. H. the material web 7 experiences one Redirection by about 180 °.

On a further cooling roller 15, the material web is rotated through an angle of approximately 180 ° distracted. On a further cooling roller 16, the material web 7 is turned through an angle deflected more than 180 °, but less than 270 °, the material web 7 of this pair of Cooling rollers leave in an inclined direction, with the web path slightly upward is pointing. To a further pair of cooling rolls, consisting of the cooling rolls 17, 18, which are arranged in approximately the same configuration as the two previous ones described cooling rollers 15, 16. The material web 7 runs on the first cooling roller 17 of the said further pair of cooling rollers starting from their inclined path on, the material web 7 the surface of this cooling roller 17 further Cooling roller pairs wrapped at an angle between 180 ° and 270 °. After that the material web 7 the surface of the first cooling roll 17 further Cooling roller pair 17, 18 has passed, it runs in an inclined A web path section that is between the second cooling roller 18 of said Cooling roller pair and a cooling roller 19 extends.

As can also be seen in FIG. 1, the material web 7 is during the Passage of the cooling rollers 20, 21 deflected in the manner shown. after the Material web 7 has left the surface of the second cooling roller 21, the runs Material web 7 in the cooling and conditioning unit 1 in the horizontal direction.

As can be seen from the drawing, the cooling rollers 8, 14, 15, 16, 17, 18, 19, 20 and 21 all in a staggered configuration with respect to one another arranged, the first cooling roller 8 closer to the inlet of the material web in the housing 2 7 is arranged in the cooling and conditioning unit 1 compared to the cooling rollers 15 and 16. The arrangement of the cooling rollers 14, 15, 16, 17, 18, 19, 20 according to the invention and 21 in a staggered configuration within the housing, its height becomes 3 effectively exploited, with a variety of cooling rollers in a short housing 2 in can be included with respect to the housing length 4, whereby the housing 2 a minimal footprint required in printing.

Advantageously, the height 3 of the housing 2 can accommodate the plurality of Cooling rollers 8, 14, 15, 16, 17, 18, 19, 20 and 21 can be used. Because the web of material the cooling and conditioning unit 1 according to the present invention in close proximity leaves for a subordinate turning bar superstructure, it is only for a very short one Exposed to the environment, resulting in only a minimal boundary layer build-up on both Sides of the freely moving web of material is possible.

The material web essentially leaves the cooling and conditioning unit 1 horizontal direction to enter a turning bar superstructure, the one Longitudinal folding section of a folder or a longitudinal cutting section of a Turning bar superstructure is connected up to a variety of web strands from the To produce material web 7.

Within the housing 2, the plurality of cooling rollers 8, 14, 15, 16, 17, 18, 19, 20 and 21 is such that they have a relatively small diameter 24, ie between 130 mm and 200 mm compared to known cooling roller arrangements , Thanks to the relatively generous wrap angle of the material web 7 around the cooling rolls, a high degree of heat transfer is achieved. Since the web tension with which the material web 7 is transported is derived from the equation
p [Pa] = σ [N / mm 2 ] / R [mm], a small cooling roll diameter 24 allows a relatively high web tension which prevails in the material web 7 during transport. A high degree of web tension exerted on the material web enables a relatively close contact between the material web surface 7 and the surface of a corresponding cooling roller which is just passing the material web 7. This improves the conditions for optimal heat transfer. Additional web tension rollers or air nozzles can be avoided by the high web tensions obtained in this way within the material web 7. Since the cooling rolls according to the present invention are optimized with regard to a certain mass inertia, they can only be driven within the cooling and conditioning unit 1 due to friction, so that an additional drive can be omitted. However, it is optionally possible to drive one or a plurality of the cooling rolls according to the invention within the cooling and conditioning unit 1 with a separate drive motor.

Another advantage of the invention is thanks to the immediate transition from Material web 7 from the dryer outlet into the cooling and conditioning unit inlet 6 The fact that the material web 7 is not exposed to the ambient atmosphere. This allows boundary layers to build up on the surfaces of the material web 7 be eliminated. The boundary layers adhering to the surfaces of the material web 7 have the disadvantageous effect that they have an air cushion between the surface of the first Form cooling roller 8, which is located closest to dryer outlet 6. The Air cushions in turn result in disadvantageous oil condensation on their surface, which represents a detachment of the ink on the first cooling roller and one Retransfer of ink deposited on the surface of the first cooling roller already printed side of the material web results. Since the material web 7 at Device according to the invention during the passage from the dryer into the cooling and Conditioning unit 1 is not exposed to the ambient atmosphere, the structure these harmful air cushions can be effectively prevented. The small diameter 24 of the Chill rolls also allow a relatively high web tension to be maintained for close contact between the web and the heat-exchanging surfaces.

At a high web running speed, the material web 7 passes through the cooling and Conditioning unit 1, the material web 7 having a plurality of cooling rolls only small diameter 24 happens. The diameter of the cooling rolls is relatively small in terms of their width. Since the plurality of cooling rolls 8, 14, 15, 16, 17, 18, 19, 20 and 21 are arranged in a staggered configuration with respect to one another within the housing 2 a plurality of cooling rollers can also be used in the housing 2 whose overall height 3 can be accommodated.

LIST OF REFERENCE NUMBERS

1
Cooling and conditioning unit
2
casing
3
height
4
length
5
Web running path
6
Cooling and conditioning unit entry
7
train
8th
first cooling roll
9
Web direction
10
Webbing-up device
11
Konditionierwerk
12
conditioning roller
13
box
14
chill roll
15
chill roll
16
chill roll
17
chill roll
18
chill roll
19
chill roll
20
chill roll
21
chill roll
22
discharge area
23
outlet roll
24
diameter

Claims (13)

  1. Cooling and conditioning unit (1) for a material web, to which ink is applied on at least one side, having a large number of cooling rolls (8, 14, 15, 16, 17, 18, 19, 21, 21), which are arranged in a housing (2) substantially vertically one above another, and around which the material web (7) is led along a web path extending substantially vertically, the cooling and conditioning unit (1) being arranged immediately downstream of a dryer in such a way that the material web (7) from the dryer outlet enters the inlet (6) of the cooling and conditioning unit (1) immediately, characterized by a first cooling roll (8) with a diameter (24) less than 300 mm and further cooling rolls (14 to 21) arranged downstream of the first and each having a respective diameter (24) of less than 300 mm, the further cooling rolls (14 to 21) arranged downstream being arranged in such a way that the material web (7) wraps around these at wrap angles between 180° and 270°.
  2. Cooling and conditioning unit according to Claim 1, characterized in that the housing (2) of the cooling and conditioning unit (1) directly adjoins the housing of the dryer arranged upstream.
  3. Cooling and conditioning unit according to Claim 1, characterized in that the housing (2) of the cooling and conditioning unit (1) is integrated into the housing of the dryer.
  4. Cooling and conditioning unit according to one of the preceding claims, characterized in that the cooling rolls (8, 14, 15, 16, 17, 18, 19, 20, 21) are arranged to be offset with respect to one another
  5. Cooling and conditioning unit according to Claim 4, characterized in that the cooling rolls (8, 14, 15, 16, 17, 18, 19, 20, 21) are arranged to be offset with respect to one another in relation to the height (3) of the housing (2).
  6. Cooling and conditioning unit according to Claim 4 or 5, characterized in that the cooling rolls (8, 14, 15, 16, 17, 18, 19, 20, 21) are arranged to be offset with respect to one another in relation to the length (4) of the housing (2).
  7. Cooling and conditioning unit according to one of the preceding claims, characterized in that the cooling rolls are arranged one above another in pairs in a plane running substantially vertically.
  8. Cooling and conditioning unit according to one of the preceding claims, characterized in that this comprises two conditioning rolls (12) arranged opposite each other to apply a liquid film to the material web (7).
  9. Cooling and conditioning unit according to Claim 8, characterized in that the conditioning rolls (12), as viewed in the running direction of the material web, are arranged between the first cooling roll (8) and further cooling rolls (14-21).
  10. Cooling and conditioning unit according to one of the preceding claims, characterized in that at least some of the cooling rolls (8, 14-21) are motor-driven rolls.
  11. Cooling and conditioning unit according to one of Claims 1 to 9, characterized in that at least some of the cooling rolls (8, 14-21) are freely rotatable, nondriven rolls.
  12. Dryer for drying a printed material web (7) in a web-fed rotary press, having a large number of cooling rolls (8, 14-21) which are arranged substantially vertically one above another in such a way that the material web (7) is led around the cooling rolls (8, 14-21) along a web path extending substantially vertically, characterized by a first cooling roll (8) with a diameter (24) of less than 300 mm and further cooling rolls (14 to 21) arranged downstream of the first and having a respective diameter (24) of less than 300 mm, the first cooling roll (8) and the further cooling rolls (14 to 21) being arranged in the housing (2) of the dryer, and the further cooling rolls (14 to 21) arranged downstream being arranged in such a way that the material web (7) wraps around these at wrap angles between 180° and 270°.
  13. Dryer according to Claim 12, characterized in that this comprises two conditioning rolls (12) arranged opposite each other to apply a liquid film to the material web (7).
EP20000106010 1999-04-21 2000-03-27 Cooling and remoistening unit for rotary presses Not-in-force EP1046500B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE1999118130 DE19918130A1 (en) 1999-04-21 1999-04-21 Cooling and humidification unit for rotary printing machines
DE19918130 1999-04-21

Publications (2)

Publication Number Publication Date
EP1046500A1 EP1046500A1 (en) 2000-10-25
EP1046500B1 true EP1046500B1 (en) 2002-08-28

Family

ID=7905386

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000106010 Not-in-force EP1046500B1 (en) 1999-04-21 2000-03-27 Cooling and remoistening unit for rotary presses

Country Status (5)

Country Link
US (1) US6318263B1 (en)
EP (1) EP1046500B1 (en)
JP (1) JP2000351198A (en)
AT (1) AT222854T (en)
DE (1) DE19918130A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1795347A2 (en) 2005-10-28 2007-06-13 Koenig & Bauer Aktiengesellschaft Support for cooling roll and method of cooling a web guided through the support
DE102006027147B4 (en) * 2006-06-12 2011-05-12 Koenig & Bauer Aktiengesellschaft Cooling roller stand for cooling a material web passed through

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Publication number Priority date Publication date Assignee Title
EP1795347A2 (en) 2005-10-28 2007-06-13 Koenig & Bauer Aktiengesellschaft Support for cooling roll and method of cooling a web guided through the support
DE102006027147B4 (en) * 2006-06-12 2011-05-12 Koenig & Bauer Aktiengesellschaft Cooling roller stand for cooling a material web passed through

Also Published As

Publication number Publication date
US6318263B1 (en) 2001-11-20
JP2000351198A (en) 2000-12-19
DE19918130A1 (en) 2000-10-26
AT222854T (en) 2002-09-15
EP1046500A1 (en) 2000-10-25

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