EP0532610A1 - Procede servant a eliminer les bulles de gaz dans une encre d'impression et a en empecher la formation - Google Patents

Procede servant a eliminer les bulles de gaz dans une encre d'impression et a en empecher la formation

Info

Publication number
EP0532610A1
EP0532610A1 EP19910910969 EP91910969A EP0532610A1 EP 0532610 A1 EP0532610 A1 EP 0532610A1 EP 19910910969 EP19910910969 EP 19910910969 EP 91910969 A EP91910969 A EP 91910969A EP 0532610 A1 EP0532610 A1 EP 0532610A1
Authority
EP
European Patent Office
Prior art keywords
ink
printing
fact
supplied
energy
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Withdrawn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
EP19910910969
Other languages
German (de)
English (en)
Inventor
Bo Nilsson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0532610A1 publication Critical patent/EP0532610A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices

Definitions

  • a constant and even ink transfer is of great importance for the final printing results.
  • a variation leads to tonality changes for the individual printing stations which in turn causes color variation of the final product many times, and so large that the final product is unacceptable to the customer.
  • the ink is transferred via rolls where a pattern with defined area and depth has been engraved into the roll surface.
  • the rotogravure process transfers the ink directly onto the substrate, whereas flexo transfers it by means of an engraved anilox roller to plates mounted on the print cylinder and these plates transfer it onto the.substrate.
  • Ink is applied to the engraved roll, and the excess is doctored off with a doctor blade, or for some flexo machines by means of a rubber roll which squeezes off the excess amount of ink.
  • a closed doctor blade assembly is used where the ink is pumped into this assembly which consists of two parallel doctor blades with seals in each end, which seal against the anilox roll.
  • a constant ink transfer presumes a few things; no dried ink may remain in the engraved cells, each cell must leave the same amount of wet ink each time it is transferring ink onto plate or substrate, no gas bubbles in the ink, which change ink density of the transferred ink should exist, or at least not vary, pigment concentration and pigment dispersion should be constant. Viscosity control is used to control pigment concentration- higher viscosity means higher pigment concentration. During the printing process solvent or water evaporates from the ink, and additional solvent is added to compensate for this loss so that the ink viscosity all the time remains constant.
  • Ultrasonic energy contributes to a solution of all above mentioned problems, degassing, which reduces foam, cleaning, which prevents or cleans cells in rolls, ink dispersion for better color density and improved wetting between carrier and pigments.
  • the ultrasonic energy can be added either externally or internally into the ink in the closed doctor blade assembly for flexo or ink tray for rotogravure processes. If cells are already filled with solidified ink one can add the ultrasonic energy to a cleaning fluid which will speed up the cleaning. This method is also used during color changes for complete cleaning as well of rolls as of doctor blade assemblies or ink trays.
  • the ink tin was opened, and viscosity was measured and found to be 140 s using a 2 mm cup. When we switched on the US generators we could notice gas bubbles coming up to the ink surface. After one hour the viscosity was measured again and found it to be 45 s. Temperature and pH did change only marginally, temperature by less than 2 degrees C and pH by 0.1. The dramatic reduction of viscosity happened without any other addition than US energy. The viscosity remained unchanged during a two weeks storing of an ink sample.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Printing Methods (AREA)

Abstract

Le procédé décrit consiste à soumettre à une énergie ultrasonore, de façon continue ou discontinue, l'encre d'impression utilisée dans des machines d'impresion pour héliogravure rotative ou pour techniques ''anilox'', afin d'en éliminer les bulles de gaz. A cet effet, une quantité suffisante d'énergie ultrasonore d'une longueur d'onde optimale est appliquée en continu, de façon à maintenir les alvéoles ouvertes dans les rouleaux d'impression d'héliogravure et de sérigraphie par trames, et de façon à permettre l'ouverture des alvéoles déjà obturées.
EP19910910969 1990-06-05 1991-06-05 Procede servant a eliminer les bulles de gaz dans une encre d'impression et a en empecher la formation Withdrawn EP0532610A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9002006A SE468754B (sv) 1990-06-05 1990-06-05 Saett att vid flexo- och djuptryckmaskiner foerhindra uppkomst av gasbubblor i tryckfaerg
SE9002006 1990-06-05

Publications (1)

Publication Number Publication Date
EP0532610A1 true EP0532610A1 (fr) 1993-03-24

Family

ID=20379681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910910969 Withdrawn EP0532610A1 (fr) 1990-06-05 1991-06-05 Procede servant a eliminer les bulles de gaz dans une encre d'impression et a en empecher la formation

Country Status (4)

Country Link
EP (1) EP0532610A1 (fr)
JP (1) JPH06502812A (fr)
SE (1) SE468754B (fr)
WO (1) WO1991018744A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE470283B (sv) * 1992-05-22 1994-01-10 Aake Boeoese Kammarrakelanordning för tryckverk och tryckverk
DE19645934A1 (de) * 1996-11-07 1998-05-14 Roland Man Druckmasch Rasterwalze innerhalb eines Auftragswerkes einer Rotationsdruckmaschine
DE10032281A1 (de) * 2000-07-03 2002-01-17 Heidelberger Druckmasch Ag Verfahren zur Beeinflussung einer Emulsion in einer Druckmaschine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62134264A (ja) * 1985-12-06 1987-06-17 Dainippon Printing Co Ltd グラビア版胴へのインキ供給方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9118744A1 *

Also Published As

Publication number Publication date
SE468754B (sv) 1993-03-15
WO1991018744A1 (fr) 1991-12-12
SE9002006L (sv) 1991-12-06
JPH06502812A (ja) 1994-03-31
SE9002006D0 (sv) 1990-06-05

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

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Effective date: 19970820