EP3552826A1 - Encrier raclant de couleur destiné à être utilisé lors de l'impression indirecte d'une surface - Google Patents

Encrier raclant de couleur destiné à être utilisé lors de l'impression indirecte d'une surface Download PDF

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Publication number
EP3552826A1
EP3552826A1 EP19166939.9A EP19166939A EP3552826A1 EP 3552826 A1 EP3552826 A1 EP 3552826A1 EP 19166939 A EP19166939 A EP 19166939A EP 3552826 A1 EP3552826 A1 EP 3552826A1
Authority
EP
European Patent Office
Prior art keywords
ink
riser
vent opening
color space
container
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
EP19166939.9A
Other languages
German (de)
English (en)
Other versions
EP3552826B1 (fr
Inventor
Oliver Nitschke
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.)
Tampoprint GmbH
Original Assignee
Tampoprint 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 Tampoprint GmbH filed Critical Tampoprint GmbH
Publication of EP3552826A1 publication Critical patent/EP3552826A1/fr
Application granted granted Critical
Publication of EP3552826B1 publication Critical patent/EP3552826B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/001—Pad printing apparatus or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/005—Ink viscosity control means

Definitions

  • the invention relates to a Farbrakeltopf for use in the indirect printing of a surface by means of a pad printing machine, with a unilaterally open ink container comprising a color space for receiving and storing applied to a cliché ink and at least one doctor blade for doctoring off excess ink from the cliché, and with a communicating with the color space vent for pad printing.
  • the ink fountain pots mentioned above are used in a known manner for storing and supplying printing ink to a plate and for doctoring off the ink from the cliche, the term "pot" not implying that these are cylindrical containers.
  • the term "pot" not implying that these are cylindrical containers.
  • the printing ink is typically a one- or two-component ink, which additionally contains a solvent which can make up a substantial proportion, for example 20%, of the printing ink and influences its viscosity.
  • a water base of an ink is considered as a solvent in the interest here.
  • the ink fountain pot is naturally reciprocated in the execution of the squeegee movement. This creates frictional heat, and inside the paint pot, overpressure builds up due to thermal expansion and, more importantly, solvent evaporation. Therefore, in the case of ink jet pots in question, a vent has been formed in an upper region of the paint container to allow vaporized solvent to escape and no overpressure hindering the process to form the ink between the ink container and the cliche is created inside the ink ribbon pot.
  • the present invention has for its object to better address the problems described above, as has been practiced since.
  • the color ink pot evaporates from the surface of the ink contained therein as a result of the reciprocating motion and the heat increase solvent is prevented according to the invention that this solvent readily escapes from the paint container. It is rather prevented from escaping into the atmosphere. Nevertheless, an excessive increase in pressure within the ink container is prevented by the gas phase above the liquid surface displacing the liquid in the riser upwards. In addition, there is also, ie within the riser, also a evaporation of solvent instead, which can escape via the vent.
  • the amount of solvent thus removed from the ink is much lower than that of the riser due to the much lower surface area of the ink within the riser, that is the size of the phase boundary between the liquid and gas phases, so that overall solvent loss is significantly reduced can.
  • the reduction of the solvent loss brought about according to the invention is the more significant the larger the diameter of the ink jet pot is, since in such case the ratio of the inner diameter of the riser pipe remains constant for the evaporation decisive surface of the color column within the riser to the surrounding surface of the ink within the ink container is even lower.
  • the present invention has the advantage that, during a typical industrial time interval, no solvent has to be replenished into the paint pot. It has been found that when using a paint pot of conventional size, a life of eight hours can be readily realized.
  • the Applicant has for this purpose experiments with a known Farbrakeltopf and inventively designed Doctor cup otherwise carried out the same size. In both cases, a printing ink having an initial viscosity of 1000 mPas was used. After an eight-hour printing process and doctor blade operation in a pad printing machine without refilling the known Farbrakeltopfs with solvent, the viscosity of the remaining ink was determined.
  • a very significant further advantage of the ink jet pot according to the invention in addition to the reduction of solvent consumption and the associated odor nuisance is also in a saving of printing ink. Namely, due to the reduction in solvent consumption, the amount of ink stored within the inkwell can be significantly reduced. Thus, it is no longer necessary to provide significantly more ink within the inkwell to limit the percentage solvent loss within the ink.
  • process reliability during the printing process is also improved.
  • the process is more stable, and although just with decreasing amount of ink towards the end of the industrial time interval out. It achieves a higher long-term print quality, which can be consistently realized over the entire considered typical industrial time interval of, for example, eight hours.
  • vent opening of the ink jet pot according to the invention is limited by the riser itself, by the riser is passed through the paint container.
  • vent opening it would also be conceivable for the vent opening to be formed or delimited by a line section or connecting piece or a connecting sleeve sealed into the paint container or by the paint container itself and to connect the riser pipe to the line section or the connecting piece or the connecting sleeve in a communicating manner with the venting opening is.
  • the line section is attached to the inwardly projecting into the paint container line section or connection piece and is then preferably held clamped.
  • vent opening with a pressure reservoir preferably outside of the color space, is flow connected. In this way, always the same pressure can be maintained above the phase boundary between the ink and the gas phase within the riser.
  • the vent is fluidly connected to the atmospheric environment of the paint container.
  • the vent opens as before in the environment of the Farbrakeltopfs.
  • the riser is arranged inside the ink container such that its open end immersed in the ink is at least 1 mm, in particular at least 2 mm, in particular at least 3 mm, in particular at least 4 mm, in particular at least 5 mm, and preferably at most 10 mm , in particular at most 9 mm, in particular at most 8 mm, in particular at most 7 mm, and further in particular at most 6 mm from a contact plane of the Farbrakeltopfs to the cliché is spaced.
  • a distance of about 4 to 6 mm, in particular of about 5 mm, is considered to be particularly suitable and advantageous.
  • the riser has an inner cross-sectional area of at least 30 mm 2 , in particular of at least 40 mm 2 , in particular of at most 100 mm 2 , in particular of at most 80 mm 2 , in particular of at most 60 mm 2 , and preferably of 50 mm 2 .
  • a cross-sectional area of the riser is at most 5%, in particular at most 2%, in particular at most 1.5%, in particular at most 1.0% of the cross-sectional area of the remaining color space.
  • the riser itself may be formed of a rigid material or of a semi-rigid material.
  • a semi-rigid material is understood as one which can be slightly deflected back and forth due to the movement of the blade due to its inertia.
  • the material may advantageously be a thermoplastic elastomer, for example the trade name Mapren.
  • a material with a Shore A hardness of 40-90, especially 50-80 is considered to be advantageous. The hardness can be determined in particular according to ASTM D 2240.
  • vent opens through a nozzle or nipple limited outside of the paint container and can be covered by a removable cap or by an adjustable between a closed position and an open position closure element.
  • FIGS. 1 to 3 show a Farbrakeltopf 2 of the invention for a pad printing machine.
  • the Farbrakeltopf 2 comprises a unilaterally open ink container 4, which is formed in the example shown dom- or dome-shaped and in FIG. 3 is shown in Appendix to an indicated cliché 6 of a tampon printing machine, otherwise not shown.
  • the ink fountain pot 2 or its ink container 4 comprises an annular doctor blade 8, which is arranged by way of example in a peripheral annular groove 10 facing the plate.
  • an elastically yielding material 12 is exemplarily inserted, which in turn exemplifies a Ring groove 14, in which the doctor blade 8 is inserted.
  • the doctor blade 8 defines a contact plane 16 of the ink jet pot 2 against the cliche 6.
  • the ink container 4 defines a color space 18 for receiving and storing applied to the plate 6 printing ink.
  • the paint container 4 further comprises a vent opening 22 bounded by the paint container 4 itself.
  • the ink container 4 comprises a line section or connecting piece 24 which opens into an upper region of the color space 18 and outside of the ink container 4.
  • a riser pipe 28 is plugged onto the line section or connecting piece 24 and held there in a clamping and sealing manner.
  • the riser 28 extends in the direction orthogonal to the abutment plane 16 of the paint container 4 and ends a few millimeters from the abutment plane 16 spaced freely. During normal operation of the Farbrakeltopfs the riser 28 so immersed in the ink 20 a.
  • a gas phase 30 within the color space 18 above the liquid surface 31 of the ink 20 is thus separated from the interior of the riser 28 communicating with the vent opening 22.
  • the pressure within the gas phase 30 rises above the liquid surface 31 of the ink 20, the liquid level 32 within the riser increases. Since evaporation of solvent from here is possible, albeit to a much lesser extent, the riser 28 still forms a type of pressure compensation device in the paint pot.
  • the riser 28 is preferably formed of a semi-rigid, slightly elastic material so that it can perform slight movements in the course of doctor blade movement. This helps keep the liquid level 32 inside the riser pipe 28 fluid throughout a typical industrial time interval. This also contributes to the spacing d of a free end 34 of the riser 28 from the contact plane 16, whereby the passage of ink 20 can take place below the free end 34 and hereby associated pressure waves can get into the riser 28.
  • the vent opening 22 opens in the case illustrated by way of example via the line section or connecting piece 24 to the outside of the Farbrakeltopfs 2.
  • a cap not shown, or an adjustable closure element can be provided.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP19166939.9A 2018-04-11 2019-04-03 Encrier raclant de couleur destiné à être utilisé lors de l'impression indirecte d'une surface Active EP3552826B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018108557.5A DE102018108557B3 (de) 2018-04-11 2018-04-11 Farbrakeltopf zur Verwendung beim indirekten Drucken einer Oberfläche

Publications (2)

Publication Number Publication Date
EP3552826A1 true EP3552826A1 (fr) 2019-10-16
EP3552826B1 EP3552826B1 (fr) 2020-11-11

Family

ID=65004047

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19166939.9A Active EP3552826B1 (fr) 2018-04-11 2019-04-03 Encrier raclant de couleur destiné à être utilisé lors de l'impression indirecte d'une surface

Country Status (2)

Country Link
EP (1) EP3552826B1 (fr)
DE (1) DE102018108557B3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112959814B (zh) * 2021-02-20 2022-06-14 江西远大保险设备实业集团有限公司 一种横向移动靶的制作装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4316294A1 (de) * 1992-05-15 1993-11-18 Teca Print Ag Thayngen Farbbehälter zum Einfärben eines Klischees einer Tampondruckmaschine
DE19908865A1 (de) * 1999-03-01 2000-09-07 Itw Morlock Gmbh Farbtopf für eine Tampondruckmaschine
EP1681159A2 (fr) * 2005-01-05 2006-07-19 Johnson & Johnson Vision Care, Inc. Contrôle de viscosité et circulation de colorants pour imprimer des moules de lentilles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4316294A1 (de) * 1992-05-15 1993-11-18 Teca Print Ag Thayngen Farbbehälter zum Einfärben eines Klischees einer Tampondruckmaschine
DE19908865A1 (de) * 1999-03-01 2000-09-07 Itw Morlock Gmbh Farbtopf für eine Tampondruckmaschine
EP1681159A2 (fr) * 2005-01-05 2006-07-19 Johnson & Johnson Vision Care, Inc. Contrôle de viscosité et circulation de colorants pour imprimer des moules de lentilles

Also Published As

Publication number Publication date
DE102018108557B3 (de) 2019-01-31
EP3552826B1 (fr) 2020-11-11

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