EP0551346B1 - Apparat zum waschen von serigraphischen rahmen und filterelement dafür - Google Patents

Apparat zum waschen von serigraphischen rahmen und filterelement dafür Download PDF

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Publication number
EP0551346B1
EP0551346B1 EP91917383A EP91917383A EP0551346B1 EP 0551346 B1 EP0551346 B1 EP 0551346B1 EP 91917383 A EP91917383 A EP 91917383A EP 91917383 A EP91917383 A EP 91917383A EP 0551346 B1 EP0551346 B1 EP 0551346B1
Authority
EP
European Patent Office
Prior art keywords
cleaning liquid
filter
tank unit
serigraphical
sludge
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.)
Expired - Lifetime
Application number
EP91917383A
Other languages
English (en)
French (fr)
Other versions
EP0551346A1 (de
Inventor
Claus Hjorth Madsen
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.)
Cps - Chemical Products & Services AS
Original Assignee
Cps - Chemical Products & Services AS
Cps - Chemical Products & Services AS
Cps Chem Prod & Service
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 Cps - Chemical Products & Services AS, Cps - Chemical Products & Services AS, Cps Chem Prod & Service filed Critical Cps - Chemical Products & Services AS
Publication of EP0551346A1 publication Critical patent/EP0551346A1/de
Application granted granted Critical
Publication of EP0551346B1 publication Critical patent/EP0551346B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/003—Cleaning arrangements or devices for screen printers or parts thereof
    • B41F35/005—Cleaning arrangements or devices for screen printers or parts thereof for flat screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/20—Wiping devices
    • B41P2235/23—Brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/30—Recovering used solvents or residues
    • B41P2235/31—Recovering used solvents or residues by filtering

Definitions

  • the present invention relates to an apparatus for washing-down serigraphical frames by means of a cleaning liquid, the apparatus comprising a sink-like tank unit having V or U shaped ends, in which tank unit the serigraphical frames are placed, a scavenging hose with affixed brush, a filter section, a circulation pump, a sludge discharge system and a recirculation system for filtered cleaning liquid.
  • the apparatus according to the invention is characterized in what is stated in the characterizing portion of claim 1.
  • US-A-4 808 237 there is disclosed a method of cleaning a silk screen including the steps of: providing a cleaning cabinet having an open front; supporting a removable silk screen in said cabinet; providing a water supply system; and spraying through said silk screen in said cabinet through said open front with solely water only from said system, essentially free of soaps, detergents, and hydrocarbons, as a water spray under pressure from 2700 to 3300 psi to thereby remove from said silk screen contaminants including inks, dyes and emulsions whereby said contaminants flow to a drain structure operatively connected to said cabinet.
  • Cleaning-off printing inks or serigraphical dyes from stencils, printing plates, serigraphical frames, rollers or the like has for many years been performed by means of cleaning liquids either containing substances which according to the definitions of the National Agency of Environmental Protection must be classified "hazardous substances" or containing low-boiling aromatic solvents. Such cleaning liquids involve considerable health hazards to the persons working with the liquids.
  • the liquids which do not contain hazardous substances, have proved to be at least as efficient as the cleaning liquids previously used, and they are significantly less health hazardous.
  • a group of similar cleaning liquids which additionally may contain as much as 25% (v/v) highboiling aromatic compounds, has also been developed by the applicant. These liquids are also at least as efficient as the cleaning liquids previously used and considerably less health hazardous.
  • the present apparatus comprises a tank unit (1), having in its longitudinal direction a "crib-like" shape with V or U shaped end faces. At the top of the tank there is mounted a lid (2) being weakly V shaped (e.g. 160°). At the bottom of the V shape the lid is provided with a row of holes, so that liquid may drain down along the entire length of the lid.
  • the washed-down cleaning liquid from the washing process drains through the row of holes down onto the centre of a similar underlying V or U shaped filter tray (3) (sieve filter).
  • a loose filter mat (4) has been rolled out, which mat is easily removable.
  • the liquid After filtration of the liquid through the filter (4) the liquid drains to the lower part of the tank from where it is discharged through the liquid outlet (14) and recirculated for renewed use.
  • a pumping-out system (7) for sludge is provided along the entire length of the tank.
  • This system which can be dismantled in view of cleaning the apparatus, comprises a suction pipe positioned in the longitudinal direction and having downwardly directed suction holes or an angle section positioned on support means with its tip pointing upwardly, and with two suction gaps in the bottom of the tank unit which gaps are adjusted according to the sludge thickness.
  • the pipe or the angle section are preferably positioned at a distance of 4-8 mm from the sides and bottom of the tank.
  • the apparatus according to the invention operates in accordance with two setting possibilities:
  • the two setting possibilities are controlled by two ball valves (8,9).
  • a circulation pump (10) is inserted between the ball valves, which are of the three-way-type. Activation of the ball valves can be automatized.
  • the filtered cleaning liquid is recirculated, as described above, and passed through the hose (11) out into the brush (12) which is used manually for the washing-down frames.
  • the two ball valves are activated to the second setting possibility whereby the sludge settled in the tank is discharged by means of the circulation pump into the tank unit (13) for destruction.
  • the apparatus according to the invention is provided with a double-acting suction system for efficient removal of solvent vapours.
  • the systems operates simultaneously according to an air curtain principle in front and a rim suction principle at the back.
  • the air curtain is provided by means of a blow-system with a plurality of holes positioned in the front edge of the sink.
  • a correspondingly wide suction gap provided in the upper front edge of the apparatus ensures the required venting.
  • the rim suction of the apparatus functions by means of a suction duct provided in the rear wall, which duct encircles the light face positioned in the rear wall for illuminating the serigraphical frames.
  • This double-acting suction system has proved to give an optimum degree of efficiency, as the air curtain in an efficient way supplements the rim suction.
  • the latter is very efficient along the circumference of the light face, but not as efficient in the centre thereof. This lacking effect can be fully compensated for by the air curtain which at the same time shields the operator from solvent vapours during the washing-down process.
  • the air curtain is thus only intersected by the tube or handle carrying the brush with which the washing-down is performed.
  • Fig. 2 is a perspective sketch of the appearance of the apparatus according to a typical embodiment.
  • the apparatus has a width of about 2.7 m, a depth of 0.8 m and a height of 2.2 m, but these dimensions are only intended for guidance, as the apparatus may of course be dimensioned according to need.
  • a and B show blowing-in and vent providing the air curtain.
  • the removable filter employed in the apparatus according to the invention is primarily of a chemically resistant fibre type, preferably a special chemically resistant glass fibre type, and secondarily a polypropylene filter cloth. Both types have surprisingly been found to be able to retain an optimum surface throughout the entire calculated life. Hereby large uniform through-flow velocity can be obtained without dirt cloggings.
  • the primary filter type which has proved to be particularly suited for the object of the invention is supplied by the German company Glaswerk Sculler GmbH, Wertheim/Main.
  • the filter is called "C-Glas-Vlies für Spezial Kunststoffe, type S 5041 Sac 50/2-S-H6" and weighs as much as 100 g per m 2 .
  • This filter type has been developed for completely different purposes than the one intended according to the invention, viz. for use as reinforcement tissue, in particular in the boat industry, and for special air filtration purposes.
  • the basis material is a woven glass fibre material provided with a special polyester coating. This special combination of materials exhibits large durability and is well suited for filtration of both the cleaning liquids described above and strongly alkaline water-based solvents (pH 13 and above).
  • the secondary filter type which has proved suited for the purpose, is supplied from the American company Consler Corporation, Homeoye Falls, New York. It is a polypropylene sheet filtration material with pore sizes of as much as 100 ⁇ m.
  • the filter type has been developed for use in the supplier's own production of filter cartridges and for this purpose it is delivered from the factory in rolls for sheet cutting. The material has not previously been used for filtration purposes of the kind to which the present invention relates.
  • the polypropylene cloth is woven from 100% clean polypropylene fibres.
  • Such a filter exhibits long durability and is also well suited for filtration of both the cleaning liquids mentioned and strongly alkaline water-based solvents (pH 13 and above).
  • the filter unit retains its effect at a continous filling from the V shaped tip of the filter towards the sides.
  • a long life is obtained.
  • the filter is supplied in a carton along with a polyethylene disposal bag, a closing strip and throw-away gloves.
  • the used (sludge filled) filter is rolled up and placed in the disposal bag together with the throw-away gloves used when removing the filter.
  • the bag is closed, put into the carton and sent for destruction.
  • the apparatus is ready again for operation.
  • a "roller curtain” with a special coating which curtain after finished washing-down is rolled down.
  • the remaining vapours will subsequently - according to the rim suction principle - be passed towards the suction ducts situated at the back, which ducts are connected to a central suction apparatus.
  • the apparatus By the apparatus according to the invention it has become possible to a very significant extent to eliminate the emission of vapours from the solvent to the surroundings, so that the staff performing washing-down of serigraphical frames by means of the apparatus, essentially avoid breathing in the vapours.
  • the staff at the same time avoid physical contact with the cleaning liquids - both when pumping out sludge and during the washing process - the users of the apparatus gain very substantial advantages in their working environment.

Landscapes

  • Filtering Materials (AREA)
  • Polarising Elements (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Claims (5)

  1. Vorrichtung zum Waschen von serigraphischen Rahmen mit Hilfe einer Reinigungsflüssigkeit, welche Vorrichtung eine ausguß- oder rinnsteinförmige Tankeinheit (1) mit V- oder U-förmigen Endflächen, oberhalb welcher Tankeinheit die serigraphischen Rahmen angeordnet werden, einen Spülschlauch (11) mit einer daran befestigten Bürste (12), einen Filterabschnitt (3 und 4), eine Umwälzpumpe (10), ein Schlammabführsystem (7, 8, 10 und 9), und ein Umwälzsystem für Flüssigkeit (14, 8, 10, 9, 11 und 12) aufweist, dadurch gekennzeichnet, daß der Filterabschnitt eine Filterschale (3) mit V- oder U-förmigem Querschnitt mit einer lose eingepaßten entfernbaren Filtermatte (4) aus chemisch widerstandsfähigem Material aufweist, daß das Schlammabführsystem aus Mitteln (7, 8, 10 und 9) für intermittierende Abführung des gesammelten Schlamms durch den Boden der Tankeinheit besteht, daß das Umwälzsystem für Flüssigkeit aus Mitteln (14, 8, 10, 9, 11 und 12) für während des Betriebes kontinuierliche Umwälzung der benutzten Reinigungsflüssigkeit nach Filtrierung besteht, und daß die Vorrichtung weiter aufweist
    - Mittel zum Hinzuführen von frischer Reinigungsflüssigkeit; und
    - ein Saugsystem zum Entfernen von Dämpfen von der Reinigungsflüssigkeit, das ein System, das gemäß einem Luftvorhangprinzip arbeitet und an der Vorderseite zur Bedienungsperson gerichtet angeordnet ist, und ein System aufweist, das entsprechend einem Rand- oder Kantensaugsystem arbeitet und an der gegenüberliegenden Rückseite angeordnet ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das chemisch widerstandsfähige Material ein Glasfasermaterial ist.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das Glasfasermaterial ein gewobenes Material ist, das soviel wie 100 g/m2, vorzugsweise 50 g/m2 wiegt und daß es mit einer Polyesterbeschichtung versehen ist.
  4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das chemisch widerstandsfähige Material Polypropylen ist, das eine Porengröße von soviel wie 100 µm aufweist.
  5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Schlammabführsystem (7, 8, 10 und 9) ein Auspumpsystem (7) für Schlamm aufweist, das am Boden der Tankeinheit (1) angeordnet ist und eine Saugröhre aufweist, die in Längsrichtung positioniert ist und mit nach unten gerichteten Löchern oder einem Winkelabschnitt versehen ist, der auf Tragmitteln angebracht ist, wobei seine Spitze nach oben Zeigt, und mit zwei Saugspalten im Boden der Tankeinheit, welche Spalte entsprechend der Dicke des Schlamms eingestellt sind.
EP91917383A 1990-10-01 1991-09-30 Apparat zum waschen von serigraphischen rahmen und filterelement dafür Expired - Lifetime EP0551346B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK2363/90 1990-10-01
DK236390A DK236390D0 (da) 1990-10-01 1990-10-01 Anlaeg til afvaskning af seriegrafirammer
PCT/DK1991/000298 WO1992005961A1 (en) 1990-10-01 1991-09-30 Apparatus for washing-down serigraphical frames and filterpart for the apparatus

Publications (2)

Publication Number Publication Date
EP0551346A1 EP0551346A1 (de) 1993-07-21
EP0551346B1 true EP0551346B1 (de) 1997-12-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91917383A Expired - Lifetime EP0551346B1 (de) 1990-10-01 1991-09-30 Apparat zum waschen von serigraphischen rahmen und filterelement dafür

Country Status (5)

Country Link
EP (1) EP0551346B1 (de)
AT (1) ATE160728T1 (de)
DE (1) DE69128355T2 (de)
DK (2) DK236390D0 (de)
WO (1) WO1992005961A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3823595A (en) * 1994-09-30 1996-05-02 Chemfree Corporation Parts washing system
DE4441040C1 (de) * 1994-11-18 1996-05-02 Mann & Hummel Filter Filtereinrichtung
ES2150014T3 (es) * 1994-11-30 2000-11-16 Cps Chem Prod & Service Un metodo de limpiar bastidores de serigrafia.
GB2336339B (en) * 1998-04-15 2001-08-08 Autotype Internat Ltd Apparatus and method for applying liquids to screenprinting screens

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1229975B (de) * 1962-10-29 1966-12-08 Erich Weber Anlage zum Waschen von Siebdruckrahmen mit fluechtigen Loesungsmitteln
US3580261A (en) * 1969-05-12 1971-05-25 John W Key Printing screen cleaner
DE2339906A1 (de) * 1973-08-07 1975-02-20 Licentia Gmbh Siebwaschanlage zum reinigen von sieben der siebdrucktechnik
US4808237A (en) * 1987-02-02 1989-02-28 Mccormick James P Method and components for cleaning silk screens
GB8709369D0 (en) * 1987-04-21 1987-05-28 Fox Petroleum Ltd Parts washer

Also Published As

Publication number Publication date
DE69128355T2 (de) 1998-05-07
DK0551346T3 (da) 1998-08-10
ATE160728T1 (de) 1997-12-15
EP0551346A1 (de) 1993-07-21
DK236390D0 (da) 1990-10-01
WO1992005961A1 (en) 1992-04-16
DE69128355D1 (de) 1998-01-15

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