EP0858396A1 - Procede de nettoyage du rouleau central d'une presse d'imprimerie - Google Patents

Procede de nettoyage du rouleau central d'une presse d'imprimerie

Info

Publication number
EP0858396A1
EP0858396A1 EP96906788A EP96906788A EP0858396A1 EP 0858396 A1 EP0858396 A1 EP 0858396A1 EP 96906788 A EP96906788 A EP 96906788A EP 96906788 A EP96906788 A EP 96906788A EP 0858396 A1 EP0858396 A1 EP 0858396A1
Authority
EP
European Patent Office
Prior art keywords
paper
middle cylinder
procedure
wash fluid
cleaning
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Withdrawn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
EP96906788A
Other languages
German (de)
English (en)
Inventor
Ari Pekka Hassinen
Klaus HÄMÄLÄINEN
Risto Paunonen
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.)
Grafisystems Oy
Original Assignee
Grafisystems Oy
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 Grafisystems Oy filed Critical Grafisystems Oy
Publication of EP0858396A1 publication Critical patent/EP0858396A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/006—Cleaning arrangements or devices for impression cylinders

Definitions

  • the present invention relates to a procedure for cleaning the middle cylinder of a press.
  • the imprint is transferred from a rubber cylinder to paper by pressing the paper between the rubber cylinder and a hard-surfaced middle cylin ⁇ der.
  • the imprint is printed onto the paper web in two stages in such a way that the first side of the paper web is printed while the web is being passed around the middle cylinder of one printing unit and the second side when the web is being passed around the middle cylinder of another printing unit.
  • the paper runs around the middle cylinder in such a way that the middle cylinder is not sufficiently exposed to enable it to be cleaned with current methods without removing the paper.
  • the press is stopped and the paper web is cut to expose the middle cylinder.
  • the cylinder is washed by manu ⁇ ally rubbing its surface with a sponge wetted in wash fluid. After the washing, the paper web is again in- stalled into the machine.
  • the main problem with the current washing method is the production time consumed by manual washing of the cylinder and reinstallation of the paper web.
  • de- vices like those presented in specifications US 4781116 and US 5080015 have been used.
  • the running speed of the press i.e. the rotational speed of the cylinders
  • the rotational speed of the cylinders is reduced during the cleaning. They have the drawback that a mere speed difference between the cylinder and paper web and the paper's own weight are not sufficient to achieve effective cleaning.
  • the object of the invention is to eliminate the drawbacks mentioned above.
  • a specific object of the invention is to present a new procedure for clean ⁇ ing the middle cylinder which is simpler and more ef- fective than current methods.
  • wash fluid is applied to the surface of the middle cylinder to be cleaned and the middle cylinder is rotated while at the same time limiting the movement of the paper web running around it with respect to the movement of the middle cylinder so that a speed difference is produced between the circumferential velocity of the middle cylinder and the running speed of the paper, causing the paper to abrade the surface of the middle cylinder and remove the dirt from it.
  • the motion of the paper is completely stopped by pressing it against the middle cylinder.
  • the sur- face is simultaneously under the influence of wash fluid, the abrasion by the paper effectively removes dirt from the surface of the middle cylinder. In this way, the dirt adheres to the paper, which carries it away from the press.
  • the cleaning is generally per- formed by disconnecting the unit containing the middle cylinder to be cleaned from the press so that the mid ⁇ dle cylinder can be rotated alone and apart from the rest of the press.
  • the wash fluid used may be any one of the wash fluids generally known in the industry which dis ⁇ solve printing ink and contain no water, causing prac ⁇ tically no deterioration of the fibrous structure of the paper.
  • the wash fluid can be applied directly onto the surface of the middle cylinder, especially when the latter is sufficiently exposed.
  • the wash fluid can be applied to the outer surface of the paper, e.g. onto the outer surface of the paper around the middle cylinder, in which case the wash fluid soaks through the paper and wets the surface of the middle cylinder. It is also possible to apply the wash fluid to a suitable area on the inner surface of the paper.
  • the ram used to stop the paper movement dur- ing cleaning can preferably be one made of elastic ma ⁇ terial, such as rubber or polyurethane plastic.
  • the ram may consist of a squeegee, spatula, doctor knife, cylinder, roller or an equivalent instrument.
  • the action stopping the paper movement can also be performed at some other point by gripping the paper or by suitably pressing it. However, this action should be so effected that it is applied relatively evenly across the whole width of the paper so as to avoid tearing the paper.
  • the pressing force of the latter increases the mechanical abrasion between the paper and the surface of the middle cylin ⁇ der, thereby improving the cleaning result.
  • impurities often gather as a heap on the mid ⁇ dle cylinder surface under the ram, but they are car ⁇ ried away with the paper or detached from the surface of the middle cylinder.
  • a heap or lump of impurities large enough to cause shredding of the pa ⁇ per web may accumulate in front of the squeegee or doctor knife during cleaning. This can be avoided in a preferred embodiment which uses at least two doctor knives.
  • at least one of the squeegees is pressing the paper web against the middle cylinder during cleaning.
  • they are alternately disen- gaged from contact with the middle cylinder and paper web so that if a lump of impurities has been accumu ⁇ lated, it can move away with the paper web before growing too large and damaging the paper web.
  • the procedure of the invention has signifi- cant advantages over known technology.
  • the washing is done quickly and in a simple manner without manual washing operations.
  • the washing operation can be carried out very quickly. Therefore, the proce- dure has a considerable effect on the impression in general, because the middle cylinder can be cleaned mo e often than before.
  • the middle cylin ⁇ der is generally only cleaned upon detection of clear deterioration of impression.
  • the invention is described by referring to the attached drawing, which illus ⁇ trates the implementation of the procedure of the in ⁇ vention in a diagrammatic form.
  • the drawing presents a diagram representing a printing unit comprising a middle cylinder 1 and four rubber cylinders 7 around it.
  • the paper 3 runs around the middle cylinder 1, passing between the middle cyl ⁇ inder and each one of the rubber cylinders.
  • the print is transferred from the rubber cylinders to the outer surface of the paper between the middle cylinder and the rubber cylinders, i.e. in the nip 8.
  • a spraying device 9 Placed near the middle cylinder 1 on the out ⁇ side of the paper 3 is a spraying device 9 and an elongated doctor knife 6 made of an elastic material, mounted in the same direction with the axis of the middle cylinder.
  • the spraying device may consist of a tube extending across the width of the paper and pro- vided with jet holes at suitable distances, through which a wash fluid is sprayed onto the paper. It is also possible to use only one jet which is moved transversely relative to the paper web. In the sim- plest application, the wash fluid can also be sprayed manually onto the paper at the beginning of the clean ⁇ ing operation.
  • the middle cylin ⁇ der 1 is cleaned as follows.
  • the press is stopped, but the paper 3 is not cut.
  • the printing unit is discon ⁇ nected from the rest of the press so that its middle cylinder can be rotated independently.
  • wash fluid 2 is applied to the outer surface 4 of the paper 3 substantially across the whole width of the paper. The wash fluid soaks through the paper and thus wets the surface of the middle cylinder as well.
  • the middle cylinder 1 is rotated slowly and at the same time a pressure is applied with the elastic doctor knife 6 on the outer surface 4 of the paper 3, pressing it against the surface of the middle cylinder so as to prevent paper movement, i.e. so that the paper remains stationary.
  • the dissolving wash fluid and the abrading paper remove any ink and fibre material from the surface of the middle cylin- der. The dirt sticks to the paper, which conveys it away from the press when the paper movement is re ⁇ leased.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Paper (AREA)

Abstract

L'invention porte sur un procédé de nettoyage du rouleau médian d'une presse consistant à appliquer le fluide de nettoyage (2) à la surface dudit rouleau (1), puis à faire tourner ce dernier tout en limitant la vitesse du papier s'y enroulant pour créer un différentiel de vitesse entre la vitesse circonférentielle du cylindre médian et la vitesse de défilement du papier, d'où résulte entre le papier et le rouleau un effet d'abrasion qui élimine la saleté du rouleau. Le mouvement du papier (3) est empêché pendant le nettoyage par pression dudit papier contre le rouleau médian (1).
EP96906788A 1995-03-24 1996-03-22 Procede de nettoyage du rouleau central d'une presse d'imprimerie Withdrawn EP0858396A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI951427 1995-03-24
FI951427A FI101059B (fi) 1995-03-24 1995-03-24 Menetelmä painokoneen keskisylinterin puhdistamiseksi
PCT/FI1996/000168 WO1996030213A1 (fr) 1995-03-24 1996-03-22 Procede de nettoyage du rouleau central d'une presse d'imprimerie

Publications (1)

Publication Number Publication Date
EP0858396A1 true EP0858396A1 (fr) 1998-08-19

Family

ID=8543122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96906788A Withdrawn EP0858396A1 (fr) 1995-03-24 1996-03-22 Procede de nettoyage du rouleau central d'une presse d'imprimerie

Country Status (4)

Country Link
EP (1) EP0858396A1 (fr)
AU (1) AU5006496A (fr)
FI (1) FI101059B (fr)
WO (1) WO1996030213A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106393974B (zh) * 2016-09-20 2018-11-23 芜湖成德龙过滤设备有限公司 滚筒清洗装置
CN106466964B (zh) * 2016-09-20 2018-11-23 芜湖成德龙过滤设备有限公司 高效滚筒清洗装置
CN106346950B (zh) * 2016-09-20 2018-11-23 芜湖成德龙过滤设备有限公司 新型滚筒清洗装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU579278B2 (en) * 1986-04-28 1988-11-17 Nikka Kabushiki Kaisha Washing method and apparatus for guide rollers of rotary press
US5080015A (en) * 1989-10-10 1992-01-14 Jimek International Ab Method and arrangement for cleaning guide rollers
DE4200767A1 (de) * 1991-11-21 1993-05-27 Windmoeller & Hoelscher Druckmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9630213A1 *

Also Published As

Publication number Publication date
AU5006496A (en) 1996-10-16
WO1996030213A1 (fr) 1996-10-03
FI951427A0 (fi) 1995-03-24
FI101059B (fi) 1998-04-15
FI951427A (fi) 1996-09-25

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Legal Events

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