EP1698469B1 - Printing apparatus - Google Patents
Printing apparatus Download PDFInfo
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- EP1698469B1 EP1698469B1 EP05090298A EP05090298A EP1698469B1 EP 1698469 B1 EP1698469 B1 EP 1698469B1 EP 05090298 A EP05090298 A EP 05090298A EP 05090298 A EP05090298 A EP 05090298A EP 1698469 B1 EP1698469 B1 EP 1698469B1
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- European Patent Office
- Prior art keywords
- printing device
- ink
- absorber material
- printing
- solution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
- B41J2/17503—Ink cartridges
Definitions
- the invention relates to a printing apparatus comprising a printhead having means for applying an ink to a substrate, the means for applying the ink comprising ink nozzles, means for moving the printhead from a rest position to a work area and back, and an ink waste container. which is located in the rest position of the print head and the ink nozzles in the rest position of the print head immediately opposite. Furthermore, the invention relates to a franking machine with such a printing device, the use of such a printing device and a method for producing such a printing device.
- Printing devices of the type mentioned in particular include inkjet printers.
- ink is sprayed from the ink nozzles in accordance with an electrical control signal onto the substrate, for example paper.
- a plurality of ink nozzles are typically arranged in extension orthogonal to the process direction of the print head.
- a line of, for example, characters or other characters can be applied to the paper.
- a constant problem with inkjet printers is the danger of ink drying in the area of the ink nozzles. Because this can lead to clogging of the ink nozzles and consequently the failure of individual ink nozzles with the result of an incomplete or faulty print image in the further operation.
- the substrate for example an envelope
- the printhead faces down vertically with its ink nozzles.
- Mastering the problem of ink drying on the ink nozzles is then usually achieved by the printhead moving to a rest position when no electrical signals are applied to drive a pressure.
- this rest position it may be provided that, for example, by a wiper lip the ink nozzles is cleaned. Regardless of this, it is usually provided that (for example, immediately before sweeping the wiper lip) a certain amount of ink is ejected from the nozzles. This serves as it were the "blowing out" of the ink nozzles.
- waste ink accumulates in the area of the rest position. This is collected in an ink waste container. The waste container is either regularly replaced or emptied.
- the absorber material of the ink waste container can absorb the highest possible amount of waste ink.
- the recorded amount of waste ink is regularly well below the theoretical absorption capacity of the absorber material.
- Theoretical uptake capacities are usually in the range from 90% to nearly 100% by volume ink, based on the volume of the absorber material, i.e. 1 ml of absorber material can absorb up to almost 1 ml of ink, which corresponds to a close to 100 vol .-% uptake. In practice, however, usually less than 50 vol .-%, often even less than 30 vol .-% can be achieved.
- waste ink may dry in the region of the outer surface of the absorber material and a near-surface edge layer in the absorber material, and consequently subsequent waste ink only hardens penetrates the dried waste ink layer.
- the uppermost and outer pores of the absorber material are clogged or glued as it were.
- relatively short maintenance intervals must be provided.
- an oversized waste ink container could be provided. The former is disturbing for cost reasons and reasons of convenience. The latter interferes with the constant demand for miniaturization of printing devices.
- the invention is therefore based on the technical problem of providing a printing device whose ink waste container can hold large amounts of waste ink and at the same time builds small.
- absorber material carries a hygroscopic material on its inner and / or outer surfaces and the hygroscopic material is an inorganic compound.
- the invention is based on the discovery without being bound by theory that the hygroscopic material from the ambient air and / or the waste ink absorbs water and blurs into a solution whose water vapor pressure compared to that of pure water or against that of the ink considerably increased is.
- the consequence is that an evaporation process does not take place any more or much slower and waste ink impinging on the absorber material is absorbed in this solution and thus ultimately prevented from drying out. At least the drying is considerably slowed down.
- the outer surfaces of the absorber material are those surfaces which are visible under normal observation.
- the inner surfaces are formed by the inner surfaces of the pores.
- Hygroscopic materials have the property, upon prolonged storage in ordinary air, which always contains water vapor, to draw in humidity and thereby gradually dilute or as far as solids are concerned, to melt or agglomerate.
- Hygroscopicity shows especially salts that dissolve very easily in water. Their saturated solutions have only a very low water vapor pressure because of the high salt concentration. Thus, water vapor condenses on the salt concerned to form a saturated solution; the salt dissipates. The same applies if an aqueous waste ink strikes the salt. In the case of the waste ink, ultimately an ink solution is created which is saturated or nearly saturated with the hygroscopic material and thus has an increased water vapor pressure. The drying is ultimately significantly slowed down at a defined temperature, for example 20 ° C.
- the hygroscopic material is an inorganic compound.
- This may in particular be a hydroxide, halide (for example fluoride, chloride or bromide), sulfate, carbonate or oxide of an element of groups 1a, 1b, 2a and 2b of the periodic table.
- groups 1a, 1b, 2a and 2b of the periodic table examples of such elements are lithium, sodium, potassium, magnesium, calcium, barium, copper and zinc.
- the further elements of the abovementioned groups of the periodic table are also suitable in principle, they should be less preferred for reasons of cost.
- the inorganic salt may be selected from the group consisting of LiOH, NaOH, KOH, CaCl 2 , CaCl 2 .2H 2 O, K 2 CO 3 , MgSO 4 , CaSO 4 , CaBr 2 , ZnCl 2 , ZnBr 2 , and mixtures of 2 or more of such substances.
- organic salts such as acetates or lactates, or organic compounds in question. Examples of these are lithium acetate, sodium acetate, lithium lactate and sodium lactate.
- glycerol is suitable.
- the absorber material may in principle be any conventional absorber material in the field of ink jet printer technology.
- polymer foams or nonwovens with synthetic and / or natural organic nonwoven fibers are suitable here. It is preferred if the polymer foam is a PU or viscose foam.
- fleece a pulp web is preferred.
- absorber materials are suitable: Spontex® Blue (available from Spontex GmbH, Germany), Dimer® A120 (available from W. Dimer GmbH, Germany), and O-Cel-O® (available from 3M, Germany
- absorber material used in a specific manner is not critical in the context of the invention.
- the ratio of the weight of the hygroscopic material in the dried, i.e. dehydrated, state to the volume of the absorbent material is preferably in the range of 0.005 g / ml to 0.5 g / ml, in particular in the range of 0.05 g / ml to 0.25 g / ml.
- the invention achieves a remarkable synergistic effect.
- the waste ink can freely penetrate the absorber material and fill almost the entire pore volume, with the result that the dimensions of the ink waste container at the same time high recording capacity can be very small.
- combustible absorber materials are provided with fire protection equipment.
- hygroscopic salts at the same time have the property of inhibiting the flammability or combustibility of combustible materials. This is also related to the fact that water is bound and held due to the hygroscopicity, which is released again in the event of fire and the associated comparatively high temperatures due to the reduction in vapor pressure and thus acts as a fire retardant.
- increased security is achieved.
- the invention further relates to a franking machine with a printing device according to the invention and to the use of a printing device or a franking machine according to the invention for printing on objects.
- a printing device such as envelopes, for example, and / or stickers for mail pieces, such as parcels or parcels, may be considered as objects.
- a printing device can be produced by impregnating the absorber material with a solution of the hygroscopic material. Thereafter, the impregnated absorbent material can be subjected to a Auspressvonsshake and / or a drying process stage. As a result, most of the pore volume of the absorber material is made available again for receiving the waste ink. In the case of Auspressvonscut 10 - 99 vol .-%, in particular 80 - 97 vol .-%, of the recorded during soaking or absorbed volume of Solution be squeezed out again. The drying can be carried out at 30 ° C to 100 ° C, especially 50 ° C to 80 ° C.
- the hygroscopic material is ultimately only in the form of a thin film or thin layer on the inner and / or outer surfaces of the absorber material. Thereafter, the absorber material is inserted into the ink waste container of the printing apparatus. This may be followed by the usual assembly steps for the completion or commissioning of the printing device.
- the solution may be a 1 to 50% strength by weight aqueous salt solution. Preference is given to the use of a 5 to 12% by weight of the CaCl 2 solution, the dihydrate being used.
- Preferred as absorber material here is a pulp web. Otherwise, in principle, all embodiments, as attached above to the printing device, apply analogously to the method according to the invention.
- Example 1 Construction of a printing device according to the invention
- FIG. 1 an example of a printing device 1 according to the invention is shown.
- the printing device 1 has a print head 2, which is equipped with means 3 for applying an ink 4 to the substrate.
- the means 2 for applying an ink 4 include inkjet nozzles 5. It can be seen further means 6 for moving the printhead 2 from a rest position A in a workspace B and back.
- an ink waste container 7 is arranged in the rest position A of the print head 2.
- the ink waste container 7 has an open-pored absorber material 8.
- the absorber material 8 is provided on its inner and outer surfaces with a hygroscopic material, which is explained in more detail in the following examples.
- Example 2 Equipment of the absorber material with a hygroscopic material
- the absorber material used was a felt-like cellulose fleece with the trade name Dimer® A120.
- a viscose foam with the trade name Spontex * ® Blue was used.
- Both absorber materials were impregnated with an aqueous solution of CaCl 2 * 2H 2 O in 10% concentration, with almost a volume was added to solution corresponding to the volume calculated from the geometric outer dimensions of the absorber material. Then the absorber material was subjected to drying at 60 ° C for 100 hours.
- Example 2 The two treated absorbent materials of Example 2 were used in the printing devices of commercial franking machines of the same type.
- the franking machines were each operated in equal, continuously repeated standard cycles until the ink was allowed to exit the ink waste container.
- the number of cycles that could be carried out until the ink emerged from the ink waste container was about 80% higher than for the absorber materials without equipment containing hygroscopic material. There were no significant differences between the two absorber materials and the improvement was about the same for both. As a result, with the same ink waste container volume, a postage meter machine can be operated almost twice as long. Conversely, for a given total amount of ink until replacement of an ink tank and an ink waste container, the ink waste container may be almost half as large as without inventive absorber material.
Abstract
Description
Die Erfindung betrifft eine Druckvorrichtung mit einem Druckkopf, welcher Mittel zum Aufbringen einer Tinte auf ein Substrat aufweist, wobei die Mittel zum Aufbringen der Tinte Tintendüsen umfassen, mit Mitteln zum Verfahren des Druckkopfes aus einer Ruheposition in einen Arbeitsbereich und zurück, und mit einem Tintenabfallbehälter, welcher in der Ruheposition des Druckkopfes und den Tintendüsen in der Ruheposition des Druckkopfes unmittelbar gegenüber liegend angeordnet ist. Des Weiteren betrifft die Erfindung eine Frankiermaschine mit einer solchen Druckvorrichtung, die Verwendung einer solchen Druckvorrichtung sowie ein Verfahren zur Herstellung einer solchen Druckvorrichtung.The invention relates to a printing apparatus comprising a printhead having means for applying an ink to a substrate, the means for applying the ink comprising ink nozzles, means for moving the printhead from a rest position to a work area and back, and an ink waste container. which is located in the rest position of the print head and the ink nozzles in the rest position of the print head immediately opposite. Furthermore, the invention relates to a franking machine with such a printing device, the use of such a printing device and a method for producing such a printing device.
Unter Druckvorrichtungen des eingangs genannten Types fallen insbesondere Tintenstrahldrucker. Hierbei wird aus den Tintendüsen Tinte nach Maßgabe eines elektrischen Steuersignals auf das Substrat, beispielsweise Papier, gespritzt. Hierbei sind typischerweise eine Mehrzahl von Tintendüsen in Erstreckung orthogonal zur Verfahrensrichtung des Druckkopfes angeordnet. Somit lässt sich im Zuge des Verfahrens des Druckkopfes eine Zeile von beispielsweise Schriftzeichen oder sonstigen Zeichen auf das Papier aufbringen.Printing devices of the type mentioned in particular include inkjet printers. In this case, ink is sprayed from the ink nozzles in accordance with an electrical control signal onto the substrate, for example paper. In this case, a plurality of ink nozzles are typically arranged in extension orthogonal to the process direction of the print head. Thus, in the course of the process of the print head, a line of, for example, characters or other characters can be applied to the paper.
Ein stetes Problem bei Tintenstrahldruckern ist die Gefahr des Eintrocknens von Tinte im Bereich der Tintendüsen. Denn dies kann zum Verstopfen der Tintendüsen und folglich dem Ausfall einzelner Tintendüsen führen mit dem Ergebnis eines unvollständigen bzw. fehlerhaften Druckbildes im weiteren Betrieb.A constant problem with inkjet printers is the danger of ink drying in the area of the ink nozzles. Because this can lead to clogging of the ink nozzles and consequently the failure of individual ink nozzles with the result of an incomplete or faulty print image in the further operation.
Im Falle von Tintenstrahldruckern, wie sie in Frankiermaschinen eingerichtet sind, ist das Substrat, beispielsweise ein Briefumschlag, oft im Wesentlichen horizontal ausgerichtet, i. e. der Druckkopf weist mit seinen Tintendüsen in vertikale Richtung nach unten. Die Beherrschung des Problems der Eintrocknung von Tinte an den Tintendüsen wird dann in der Regel dadurch erreicht, dass der Druckkopf in eine Ruheposition fährt, wenn keine elektrischen Signale zur Ansteuerung eines Druckes anliegen In dieser Ruheposition kann vorgesehen sein, dass beispielsweise durch eine Abstreiflippe der Bereich der Tintendüsen gereinigt wird. Unabhängig hiervon ist in der Regel vorgesehen, dass (beispielsweise unmittelbar vor Überstreichen der Abstreiflippe) eine bestimmte Menge Tinte aus den Düsen ausgestoßen wird. Dies dient gleichsam dem "Freiblasen" der Tintendüsen. Im Ergebnis fällt im Bereich der Ruheposition Abfalltinte an. Diese wird in einem Tintenabfallbehälter aufgefangen. Der Tintenabfallbehälter wird entweder regelmäßig ausgetauscht oder ausgeleert.In the case of inkjet printers, such as those set up in franking machines, the substrate, for example an envelope, is often substantially horizontally oriented, i. e. the printhead faces down vertically with its ink nozzles. Mastering the problem of ink drying on the ink nozzles is then usually achieved by the printhead moving to a rest position when no electrical signals are applied to drive a pressure. In this rest position, it may be provided that, for example, by a wiper lip the ink nozzles is cleaned. Regardless of this, it is usually provided that (for example, immediately before sweeping the wiper lip) a certain amount of ink is ejected from the nozzles. This serves as it were the "blowing out" of the ink nozzles. As a result, waste ink accumulates in the area of the rest position. This is collected in an ink waste container. The waste container is either regularly replaced or emptied.
Aus der Praxis ist es bekannt, den Tintenabfallbehälter mit einem offenporigen Absorbermaterial, beispielsweise einem polymeren Schaumstoff, auszufüllen. Durch diesen Schaumstoff wird die Abfalltinte aufgesaugt und im Inneren der Poren des Schaumstoffmaterials festgehalten. Hierdurch ist gewährleistet, dass aus dem Tintenabfallbehälter nicht ohne weiteres Abfalltinte wieder austreten kann, was insbesondere bei Transport der Druckvorrichtung ansonsten geschehen könnte.From practice it is known to fill the ink waste container with an open-pored absorber material, for example a polymeric foam. Through this foam, the waste ink is absorbed and held in the interior of the pores of the foam material. This ensures that the ink waste container does not without further waste ink can escape again, which could otherwise happen especially when transporting the printing device.
In Hinblick auf möglichst lange Wartungsintervalle ist es wünschenswert, wenn das Absorbermaterial des Tintenabfallbehälters eine möglichst hohe Menge Abfalltinte aufnehmen kann. Hierbei ist problematisch, dass die aufgenommene Menge an Abfalltinte regelmäßig deutlich unterhalb der theoretischen Aufnahmekapazität des Absorbermaterials liegt. Theoretische Aufnahmekapazitäten liegen meist im Bereich von 90 Vol.-% bis nahezu 100 Vol.-% Tinte, bezogen auf das Volumen des Absorbermaterials, i.e. 1 ml Absorbermaterial kann bis zu knapp 1 ml Tinte aufnehmen, was einer nahzu 100 Vol.-%igen Aufnahme entspricht. In der Praxis werden jedoch meist weniger als 50 Vol.-%, oft sogar weniger als 30 Vol.-% erreicht. Der Grund hierfür ist, dass Abfalltinte im Bereich der Außenoberfläche des Absorbermaterials und einer oberflächennahen Randschicht im Absorbermaterial eintrocknen kann und folglich nachfolgende Abfalltinte nur erschwert die eingetrocknete Abfalltintenschicht penetriert. Die obersten bzw. äußeren Poren des Absorbermaterials werden gleichsam verstopft bzw. verklebt. Im Ergebnis müssen relativ kurze Wartungsintervalle vorgesehen werden. Alternativ könnte ein überdimensionierter Tintenabfallbehälter vorgesehen werden. Ersteres ist aus Kostengründen und Gründen der Bequemlichkeit störend. Letzteres stört in Hinblick auf die stete Anforderung der Miniaturisierung von Druckvorrichtungen.In view of the longest possible service intervals, it is desirable if the absorber material of the ink waste container can absorb the highest possible amount of waste ink. Here, it is problematic that the recorded amount of waste ink is regularly well below the theoretical absorption capacity of the absorber material. Theoretical uptake capacities are usually in the range from 90% to nearly 100% by volume ink, based on the volume of the absorber material, i.e. 1 ml of absorber material can absorb up to almost 1 ml of ink, which corresponds to a close to 100 vol .-% uptake. In practice, however, usually less than 50 vol .-%, often even less than 30 vol .-% can be achieved. The reason for this is that waste ink may dry in the region of the outer surface of the absorber material and a near-surface edge layer in the absorber material, and consequently subsequent waste ink only hardens penetrates the dried waste ink layer. The uppermost and outer pores of the absorber material are clogged or glued as it were. As a result, relatively short maintenance intervals must be provided. Alternatively, an oversized waste ink container could be provided. The former is disturbing for cost reasons and reasons of convenience. The latter interferes with the constant demand for miniaturization of printing devices.
Aus den Literaturstellen
Der Erfindung liegt daher das technische Problem zugrunde, eine Druckvorrichtung anzugeben, deren Tintenabfallbehälter große Mengen an Abfalltinte aufnehmen kann und zugleich klein baut.The invention is therefore based on the technical problem of providing a printing device whose ink waste container can hold large amounts of waste ink and at the same time builds small.
Zur Lösung dieses technischen Problems lehrt die Erfindung, dass Absorbermaterial auf seinen inneren und/oder äußeren Oberflächen ein hygroskopisches Material trägt und das hygroskopische Material eine anorganische Verbindung ist.To solve this technical problem, the invention teaches that absorber material carries a hygroscopic material on its inner and / or outer surfaces and the hygroscopic material is an inorganic compound.
Die Erfindung beruht auf der Erkenntnis, ohne an die Theorie gebunden zu sein, dass das hygroskopische Material aus der Umgebungsluft und/oder der Abfalltinte Wasser aufnimmt und zu einer Lösung verschwimmt, deren Wasserdampfdruck gegenüber jenem von reinem Wasser bzw. gegenüber jenem der Tinte beachtlich erhöht ist. Die Folge ist, dass ein Verdunstungsprozess nicht mehr bzw. erheblich langsamer stattfindet und auf das Absorbermaterial auftreffende Abfalltinte in dieser Lösung aufgenommen und so letztendlich vor dem Eintrocknen bewahrt wird. Zumindest wird das Eintrocknen beachtlich verlangsamt. Im Ergebnis findet keine Verstopfung oberflächennaher Poren des Absorbermaterials statt und Abfalltinte kann praktisch im gesamten Volumen des Absorbermaterials aufgenommen werden.The invention is based on the discovery without being bound by theory that the hygroscopic material from the ambient air and / or the waste ink absorbs water and blurs into a solution whose water vapor pressure compared to that of pure water or against that of the ink considerably increased is. The consequence is that an evaporation process does not take place any more or much slower and waste ink impinging on the absorber material is absorbed in this solution and thus ultimately prevented from drying out. At least the drying is considerably slowed down. As a result, there is no clogging of near-surface pores of the absorber material, and waste ink can be taken up in virtually the entire volume of the absorber material.
Als äußere Oberflächen des Absorbermaterials sind solche Oberlächen bezeichnet, die bei normaler Betrachtung sichtbar sind. Die inneren Oberflächen werden durch die Innenflächen der Poren gebildet.The outer surfaces of the absorber material are those surfaces which are visible under normal observation. The inner surfaces are formed by the inner surfaces of the pores.
Hygroskopische Materialien haben die Eigenschaft, bei längerer Lagerung an gewöhnlicher Luft, die stets Wasserdampf enthält, Luftfeuchtigkeit an sich zu ziehen und sich dabei allmählich zu verdünnen bzw. soweit es sich um feste Stoffe handelt, zu zerfließen oder zu verklumpen. Hygroskopizität zeigen vor allem Salze, die sich sehr leicht in Wasser lösen. Ihre gesättigten Lösungen haben wegen der hohen Salzkonzentration nur einen sehr geringen Wasserdampfdruck. Somit kondensiert Wasserdampf auf dem betreffenden Salz unter Bildung einer gesättigten Lösung; das Salz zerfließt also. Entsprechendes gilt, wenn eine wässrige Abfalltinte auf das Salz trifft. Im Falle der Abfalltinte wird letztlich eine Tintenlösung geschaffen, welche mit dem hygroskopischen Material gesättigt oder nahezu gesättigt ist und folglich einen erhöhten Wasserdampfdruck aufweist. Die Eintrocknung ist letztendlich bei einer definierten Temperatur, beispielsweise 20 °C, erheblich verlangsamt.Hygroscopic materials have the property, upon prolonged storage in ordinary air, which always contains water vapor, to draw in humidity and thereby gradually dilute or as far as solids are concerned, to melt or agglomerate. Hygroscopicity shows especially salts that dissolve very easily in water. Their saturated solutions have only a very low water vapor pressure because of the high salt concentration. Thus, water vapor condenses on the salt concerned to form a saturated solution; the salt dissipates. The same applies if an aqueous waste ink strikes the salt. In the case of the waste ink, ultimately an ink solution is created which is saturated or nearly saturated with the hygroscopic material and thus has an increased water vapor pressure. The drying is ultimately significantly slowed down at a defined temperature, for example 20 ° C.
Erfindungsgemäß ist das hygroskopische Material eine anorganische Verbindung. Hierbei kann es sich insbesondere um ein Hydroxid, Halogenid (beispielsweise Fluorid, Chlorid oder Bromid), Sulfat, Carbonat oder Oxid eines Elements der Gruppen 1a, 1b, 2a und 2b des Periodensystems handeln. Beispiele solcher Elemente sind Lithium, Natrium, Kalium, Magnesium, Kalzium, Barium, Kupfer und Zink. Die weiteren Elemente der vorstehend genannten Gruppen des Periodensystems sind zwar grundsätzlich ebenfalls geeignet, dürften jedoch aus Kostengründen weniger bevorzugt sein. Das anorganische Salz, ggf. hydratisiert, kann ausgewählt sein aus der Gruppe bestehend aus LiOH, NaOH, KOH, CaCl2, CaCl2*2H2O, K2CO3, MgSO4, CaSO4, CaBr2, ZnCl2, ZnBr2, und Mischungen von 2 oder mehr solcher Substanzen.According to the invention, the hygroscopic material is an inorganic compound. This may in particular be a hydroxide, halide (for example fluoride, chloride or bromide), sulfate, carbonate or oxide of an element of groups 1a, 1b, 2a and 2b of the periodic table. Examples of such elements are lithium, sodium, potassium, magnesium, calcium, barium, copper and zinc. Although the further elements of the abovementioned groups of the periodic table are also suitable in principle, they should be less preferred for reasons of cost. The inorganic salt, optionally hydrated, may be selected from the group consisting of LiOH, NaOH, KOH, CaCl 2 , CaCl 2 .2H 2 O, K 2 CO 3 , MgSO 4 , CaSO 4 , CaBr 2 , ZnCl 2 , ZnBr 2 , and mixtures of 2 or more of such substances.
Bevorzugt ist der Einsatz von CaCl2, insbesondere in der Form des Dihydrats. Neben solchen anorganischen Verbindungen kommen aber auch hygroskopische organische Salze, beispielsweise Acetate oder Lactate, oder organische Verbindungen in Frage. Beispiele hierfür sind Lithiumacetat, Natriumacetat, Lithiumlactat und Natriumlactat. Ebenso ist beispielsweise Glycerin geeignet.Preference is given to the use of CaCl 2 , in particular in the form of the dihydrate. In addition to such inorganic compounds but also hygroscopic organic salts, such as acetates or lactates, or organic compounds in question. Examples of these are lithium acetate, sodium acetate, lithium lactate and sodium lactate. Likewise, for example, glycerol is suitable.
Das Absorbermaterial kann grundsätzlich ein beliebiges, im Bereich der Technologie der Tintenstrahldrucker übliches Absorbermaterial sein. Hier kommen insbesondere Polymerschaumstoffe in Frage oder Vliese mit synthetischen und/ oder natürlichen organischen Vliesfasern. Bevorzugt ist es, wenn der Polymerschaumstoff ein PU- oder Viskoseschaum ist. Als Vlies ist ein Zellstoffvlies bevorzugt. In Frage kommen beispielsweise die folgenden handelsüblichen Absorbermaterialien: Spontex® Blue (erhältlich von Spontex GmbH, Deutschland), Dimer® A120 (erhältlich von W. Dimer GmbH, Deutschland), und O-Cel-O® (erhältlich von 3M, Deutschland. Das konkret verwendete Absorbermaterial ist im Rahmen der Erfindung jedoch unkritisch.The absorber material may in principle be any conventional absorber material in the field of ink jet printer technology. In particular, polymer foams or nonwovens with synthetic and / or natural organic nonwoven fibers are suitable here. It is preferred if the polymer foam is a PU or viscose foam. As fleece, a pulp web is preferred. For example, the following commercially available absorber materials are suitable: Spontex® Blue (available from Spontex GmbH, Germany), Dimer® A120 (available from W. Dimer GmbH, Germany), and O-Cel-O® (available from 3M, Germany However, absorber material used in a specific manner is not critical in the context of the invention.
Das Verhältnis des Gewichtes des hygroskopischen Materials im getrockneten, i.e. entwässerten, Zustand zum Volumen des Absorbermaterials liegt vorzugsweise im Bereich von 0,005 g/ml bis 0,5 g/ml, insbesondere im Bereich von 0,05 g/ml bis 0,25 g/ml.The ratio of the weight of the hygroscopic material in the dried, i.e. dehydrated, state to the volume of the absorbent material is preferably in the range of 0.005 g / ml to 0.5 g / ml, in particular in the range of 0.05 g / ml to 0.25 g / ml.
Mit der Erfindung wird im Übrigen ein beachtlicher synergistischer Effekt erhalten. Einerseits kann die Abfalltinte das Absorbermaterial ungehindert durchdringen und nahezu das gesamte Porenvolumen ausfüllen mit der Folge, dass die Abmessungen des Tintenabfallbehälters bei gleichzeitig hoher Aufnahmekapazität sehr klein ausfallen können. Zum anderen werden an sich brennbare Absorbermaterialien mit einer Brandschutzausstattung versehen. Denn insbesondere hygroskopische Salze haben zugleich die Eigenschaft, die Entflammbarkeit bzw. Brennbarkeit von an sich brennbaren Materialien zu hemmen. Auch dies hängt damit zusammen, dass aufgrund der Hygroskopizität Wasser gebunden und gehalten wird, welches im Brandfall und den damit verbundenen vergleichsweise sehr hohen Temperaturen auf Grund der Dampfdruckerniedrigung retardiert wieder freigesetzt wird und somit brandhemmend wirkt. Letztendlich wird also neben der verbesserten Aufnahmekapazität im Betrieb auch eine erhöhte Sicherheit erreicht.Incidentally, the invention achieves a remarkable synergistic effect. On the one hand, the waste ink can freely penetrate the absorber material and fill almost the entire pore volume, with the result that the dimensions of the ink waste container at the same time high recording capacity can be very small. On the other hand, combustible absorber materials are provided with fire protection equipment. In particular, hygroscopic salts at the same time have the property of inhibiting the flammability or combustibility of combustible materials. This is also related to the fact that water is bound and held due to the hygroscopicity, which is released again in the event of fire and the associated comparatively high temperatures due to the reduction in vapor pressure and thus acts as a fire retardant. Ultimately, therefore, in addition to the improved absorption capacity during operation, increased security is achieved.
Die Erfindung betrifft des Weiteres eine Frankiermaschine mit einer erfindungsgemäßen Druckvorrichtung sowie die Verwendung einer erfindungsgemäßen Druckvorrichtung oder einer solchen Frankiermaschine zum Bedrucken von Gegenständen. Als Gegenstände kommen im Falle der Frankiermaschine insbesondere Poststücke, wie beispielsweise Briefumschlage, und/oder Aufkleber für Poststücke, wie beispielsweise Päckchen oder Packete, in Frage.The invention further relates to a franking machine with a printing device according to the invention and to the use of a printing device or a franking machine according to the invention for printing on objects. In the case of the franking machine, mail items, such as envelopes, for example, and / or stickers for mail pieces, such as parcels or parcels, may be considered as objects.
Eine erfindunsgemäße Druckvorrichtung lässt sich herstellen, indem das Absorbermaterial mit einer Lösung des hygroskopischen Materials getränkt wird. Hiernach kann das getränkte Absorbermaterial einer Auspressverfahrensstufe und/oder einer Trocknungsverfahrensstufe unterworfen werden. Dadurch wird der größte Teil des Porenvolumens des Absorbermaterials wieder zur Aufnahme der Abfalltinte zur Verfügung gestellt. Im Falle der Auspressverfahrensstufe können 10 - 99 Vol.-%, insbesondere 80 - 97 Vol.-%, des beim Tränken aufgenommenen bzw. aufgesaugten Volumens an Lösung wieder ausgepresst werden. Die Trocknung kann bei 30°C bis 100°C, insbesondere 50°C bis 80°C, erfolgen. Das hygroskopische Material befindet sich letztendlich lediglich noch als dünner Film oder dünne Schicht auf den inneren und/oder äußeren Oberflächen des Absorbermaterials. Hiernach wird das Absorbermaterial in den Tintenabfallbehälter der Druckvorrichtung eingesetzt. Hieran schließen sich ggf. die üblichen Montageschritte zur Fertigstellung bzw. Inbetriebnahme der Druckvorrichtung an.A printing device according to the invention can be produced by impregnating the absorber material with a solution of the hygroscopic material. Thereafter, the impregnated absorbent material can be subjected to a Auspressverfahrensstufe and / or a drying process stage. As a result, most of the pore volume of the absorber material is made available again for receiving the waste ink. In the case of Auspressverfahrensstufe 10 - 99 vol .-%, in particular 80 - 97 vol .-%, of the recorded during soaking or absorbed volume of Solution be squeezed out again. The drying can be carried out at 30 ° C to 100 ° C, especially 50 ° C to 80 ° C. The hygroscopic material is ultimately only in the form of a thin film or thin layer on the inner and / or outer surfaces of the absorber material. Thereafter, the absorber material is inserted into the ink waste container of the printing apparatus. This may be followed by the usual assembly steps for the completion or commissioning of the printing device.
Im Rahmen des erfindungsgemäßen Einsatzes eines anorganischen Salzes als hygroskopisches Material kann es sich bei der Lösung um eine 1 bis 50 Gew-%ige wässrige Salzlösung handeln. Bevorzugt ist der Einsatz einer 5 bis 12 Gew-%i-gen CaCl2-Lösung, wobei das Dihydrat eingesetzt wird. Bevorzugt als Absorbermaterial ist hierbei ein Zellstoffvlies. Ansonsten gelten grundsätzlich alle Ausführungen, wie vorstehend zur Druckvorrichtung angebracht, für das erfindungsgemäße Verfahren analog.In the context of the use according to the invention of an inorganic salt as a hygroscopic material, the solution may be a 1 to 50% strength by weight aqueous salt solution. Preference is given to the use of a 5 to 12% by weight of the CaCl 2 solution, the dihydrate being used. Preferred as absorber material here is a pulp web. Otherwise, in principle, all embodiments, as attached above to the printing device, apply analogously to the method according to the invention.
Im Folgenden wird die Erfindung anhand von lediglich eine Ausführungsform darstellenden Beispielen näher erläutert.In the following, the invention will be explained in more detail with reference to examples which represent only one embodiment.
In der
Als Absorbermaterial wurde ein filzartiges Zellstoffvlies mit der Handelsbezeichnung Dimer® A120 eingesetzt. Als Alternative wurde ein Viskoseschaum mit der Handelsbezeichnung Spontex*® Blue verwendet.The absorber material used was a felt-like cellulose fleece with the trade name Dimer® A120. As an alternative, a viscose foam with the trade name Spontex * ® Blue was used.
Beide Absorbermaterialien wurden mit einer wässrigen Lösung von CaCl2*2H2O in 10%-iger Konzentration getränkt, wobei nahezu ein Volumen an Lösung aufgenommen wurde, welches dem aus den geometrischen Außenabmessungen des Absorbermaterials berechneten Volumen entspricht. Hierauf wurde das Absorbermaterial einer Trocknung bei 60 °C über 100 Stunden unterzogen.Both absorber materials were impregnated with an aqueous solution of CaCl 2 * 2H 2 O in 10% concentration, with almost a volume was added to solution corresponding to the volume calculated from the geometric outer dimensions of the absorber material. Then the absorber material was subjected to drying at 60 ° C for 100 hours.
Die beiden behandelten Absorbermaterialien aus Beispiel 2 wurden in die Druckvorrichtungen handelsüblicher Frankiermaschinen gleichen Typs eingesetzt. Die in den Frankiermaschinen verwendete Tinte ist von der Firma Hewlett Packard und trägt die Handelsbezeichnung Spot Blue 6170. Die Frankiermaschinen wurde jeweils in gleichen, sich stetig wiederholenden Normzyklen betrieben, bis der Austritt von Tinte aus dem Tintenabfallbehälter zu beobachten war.The two treated absorbent materials of Example 2 were used in the printing devices of commercial franking machines of the same type. The in the Ink used by Hewlett Packard and bears the trade name Spot Blue 6170. The franking machines were each operated in equal, continuously repeated standard cycles until the ink was allowed to exit the ink waste container.
Zum Vergleich wurde mit den gleichen Absorbermaterialien, jedoch ohne Ausstattung mit dem hygroskopischen Material bei ansonsten unveränderten Bedingungen das entsprechende Prüfverfahren nochmals durchgeführt.For comparison, with the same absorber materials, but without equipment with the hygroscopic material under otherwise unchanged conditions, the corresponding test procedure was carried out again.
Im Falle der erfindungsgemäß ausgestatteten Absorbermaterialien lag die Anzahl der bis zum Austritt von Tinte aus dem Tintenabfallbehälter ausführbaren Zyklen ca. 80 % höher als für die Absorbermaterialien ohne Ausstattung mit hygroskopischem Material. Zwischen den beiden Absorbermaterialien ergaben sich keine signifikanten Unterschiede, die Verbesserung war bei beiden etwa gleich hoch. Im Ergebnis kann bei gleichem Tintenabfallbehältervolumen eine Frankiermaschine nahezu doppelt so lang betrieben werden. Umgekehrt kann bei einer vorgegebenen Gesamttintenmenge bis zum Auswechseln eines Tintenbehälters sowie eines Tintenabfallbehälters der Tintenabfallbehälter nahezu halb so groß ausfallen, wie ohne erfindungsgemäßes Absorbermaterial.In the case of the absorber materials equipped according to the invention, the number of cycles that could be carried out until the ink emerged from the ink waste container was about 80% higher than for the absorber materials without equipment containing hygroscopic material. There were no significant differences between the two absorber materials and the improvement was about the same for both. As a result, with the same ink waste container volume, a postage meter machine can be operated almost twice as long. Conversely, for a given total amount of ink until replacement of an ink tank and an ink waste container, the ink waste container may be almost half as large as without inventive absorber material.
Claims (14)
- A printing device (1)
comprising a printing head (2), which is provided with means (3) for applying an ink (4) on a substrate, the means (3) for applying the ink (4) comprising ink nozzles (5),
comprising means (6) for moving the printing head (2) from an inoperative position (A) into an operative position (B) and back, and
comprising a waste ink tank (7), which in the inoperative position (A) of the printing head (2) is opposite to the ink nozzles (5) in the inoperative position (A) of the printing head (2),
the waste ink tank (7) comprising an open-pore absorber material (8), and
the absorber material (8) carrying on its internal and/or external surfaces a hygroscopic material,
characterized by
that the hygroscopic material is an inorganic compound. - The printing device (1) according to claim 1, characterized by that the inorganic compound is a halide, sulfate, carbonate, hydroxide or oxide of an element of the groups 1a, 1b, 2a or 2b of the periodic table.
- The printing device (1) according to claim 1, characterized by that the inorganic compound is a salt, which is selected from the group comprising "LiOH, NaOH, KOH, CaCl2, CaCl2*H2O, K2CO3, MgSO4, CaSO4, CaBr2, ZnCl2, ZnBr2, hydrates of the above salts, and mixtures of 2 or more of such substances".
- The printing device (1) according to one of claims 1 to 3, characterized by that the ratio of the weight of the hygroscopic material in dried condition to the volume of the absorber material is in the range from 0.005 g/ml to 1.0 g/ml, in particular 0.05 g/ml to 0.25 g/ml.
- The printing device (1) according to one of claims 1 to 4, characterized by that the absorber material is a polymeric foam or a fleece with synthetic and/or natural organic fleece fibers.
- The printing device (1) according to claim 5, characterized by that the polymeric foam is a PU or viscose foam.
- The printing device (1) according to claim 5, characterized by that the fleece is a cellulose fleece.
- A franking machine comprising a printing device (1) according to one of claims 1 to 7.
- The use of a printing device (1) according to one of claims 1 to 8 or of a franking machine according to claim 8 for printing objects.
- The use according to claim 9, wherein the objects are mailpieces and/or adhesive labels for mailpieces.
- A method for producing a printing device (1) according to one of claims 1 to 7,
the absorber material (8) being soaked with a solution of the hygroscopic material,
the soaked absorber material (8) being submitted to a drying step and/or an extrusion step, and
the absorber material (8) being then placed in the waste ink tank (7),
characterized by
that the hygroscopic material is an inorganic compound. - The method according to claim 11, characterized by that the solution is an aqueous solution of an inorganic salt.
- The method according to claim 12, characterized by that the solution is a 1 to 50 wt.-% aqueous CaCl2 solution.
- The method according to one of claims 11 to 13, characterized by that the absorber material is a cellulose fleece.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005011360A DE102005011360B4 (en) | 2005-03-04 | 2005-03-04 | printing device |
Publications (3)
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| EP1698469A2 EP1698469A2 (en) | 2006-09-06 |
| EP1698469A3 EP1698469A3 (en) | 2007-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| EP (1) | EP1698469B1 (en) |
| AT (1) | ATE414615T1 (en) |
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| DE102007060733A1 (en) | 2007-12-17 | 2009-06-25 | Francotyp-Postalia Gmbh | Device for changing ink cartridges |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60224550A (en) * | 1984-04-23 | 1985-11-08 | Canon Inc | Clogging preventive mechanism for ink jet printer |
| US4919715A (en) * | 1988-06-03 | 1990-04-24 | Freeport Mcmoran Inc. | Treating refractory gold ores via oxygen-enriched roasting |
| GB8919917D0 (en) * | 1989-09-04 | 1989-10-18 | Alcatel Business Systems | Franking machine |
| US5956053A (en) * | 1996-10-31 | 1999-09-21 | Hewlett-Packard Company | Dual seal capping system for inkjet printheads |
| ID26734A (en) * | 1999-08-03 | 2001-02-08 | Bridgestone Corp | REMOVAL INK ABSORPTION AND INK SUPPORTING MATERIALS |
| AU2001242676A1 (en) * | 2000-03-21 | 2001-10-03 | Ehud Shapiro | Community co-presence system and method having virtual groups |
| US6681109B1 (en) * | 2000-05-08 | 2004-01-20 | Richard Leifer | Server call system |
| AU2001276992A1 (en) * | 2000-07-20 | 2002-02-05 | Aeptec Microsystems, Inc. | Method, system, and protocol for location-aware mobile devices |
| US6618593B1 (en) * | 2000-09-08 | 2003-09-09 | Rovingradar, Inc. | Location dependent user matching system |
| US6609004B1 (en) * | 2000-09-22 | 2003-08-19 | Motorola Inc | Communication management system for personalized mobility management of wireless services and method therefor |
| US6829491B1 (en) * | 2001-08-15 | 2004-12-07 | Kathrein-Werke Kg | Dynamic and self-optimizing smart network |
| GB2392414A (en) * | 2002-08-30 | 2004-03-03 | Hewlett Packard Co | Inkjet printhead servicing arrangement including first and second sets of servicing components wherein the first set of components is separately replaceable |
| US7248880B2 (en) * | 2003-02-07 | 2007-07-24 | Siemens Communications, Inc. | Methods and apparatus for determining a location of a device |
| US7190948B2 (en) * | 2003-03-10 | 2007-03-13 | Avaya Technology Corp. | Authentication mechanism for telephony devices |
| US7289814B2 (en) * | 2003-04-01 | 2007-10-30 | International Business Machines Corporation | System and method for detecting proximity between mobile device users |
| JP4277591B2 (en) * | 2003-06-20 | 2009-06-10 | ソニー株式会社 | Liquid ejection device |
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- 2005-10-27 AT AT05090298T patent/ATE414615T1/en active
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Also Published As
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| US20060197800A1 (en) | 2006-09-07 |
| EP1698469A3 (en) | 2007-09-26 |
| EP1698469A2 (en) | 2006-09-06 |
| US7591530B2 (en) | 2009-09-22 |
| ATE414615T1 (en) | 2008-12-15 |
| DE502005005995D1 (en) | 2009-01-02 |
| DE102005011360A1 (en) | 2006-09-07 |
| DE102005011360B4 (en) | 2006-11-30 |
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