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    • 专利摘要:
    A method for managing the ink quality of an inkjet printer as a function of temperature by using the viscosity management of the ink as a function of temperature, said ink comprising a solvent or a mixture of solvents and said solvent or solvent mixture representing at least 50% by weight of the total mass of the ink, wherein the viscosity of the ink at a temperature T is calculated from the following parameters: - the viscosity of the single temperature reference ink Tref; the parameters K or Ln (K), and -E / R of equation (1) giving the viscosity of the solvent or of the mixture of solvents: Ln (viscosity of the solvent) = Ln (K) -E / RT (1) where E is the Arrhenius activation energy given in J / mol and R is the perfect gas constant.
    公开号:FR3025454A1
    申请号:FR1458284
    申请日:2014-09-04
    公开日:2016-03-11
    发明作者:Saint-Romain Pierre De
    申请人:Markem Imaje Holding SAS；
    IPC主号:
    专利说明:

    [0001] METHOD OF MANAGING INK QUALITY OF INK JET PRINTER BASED ON TEMPERATURE. TECHNICAL FIELD The present invention relates to a method for managing the ink quality of an ink jet printer, more precisely a deviated continuous jet printer, as a function of temperature. STATE OF THE PRIOR ART In an inkjet printer using the deflected continuous jet principle, the ink not used for printing is recycled. The recovered ink, however, does not have the same properties as the ink emitted in the jet, mainly because of solvent evaporation. Two documents, namely EP-A2-0 333 325 [1] and EP-A1-0 142 265 [2], describe methods for controlling the drift of ink quality. The evaporation of the solvent must, in fact, be compensated by adding exactly the amount of solvent evaporated to keep the quality of the ink constant. To ensure servoing of this addition of solvent without fluctuation ("pumping"), it is necessary to take into account the speed of evaporation. The document [1] takes into account the measurement of the emptying time, by the ink jet, of a calibrated volume. A temperature sensor makes it possible to take into account the natural influence of the temperature on the quality of the ink. The temperature indeed affects the viscosity and the density of the ink. The enslavement performed uses a drain curve depending on the temperature. A reference point is established at the start of the machine to take into account the dispersions between the different applications envisaged. In the document [2], the machine used is equipped with a specific device (ball viscometer) to know the viscosity of the ink of the machine. A viscosity / temperature curve reflects the operating setpoint.
    [0002] However, the evolution of the density of the ink is absolutely not taken into account. This process is independent of the inkjet and does not involve the operating pressure. This machine works at constant pressure and does not provide consistent writing quality over a wide temperature range. In addition, such an embodiment is of a high cost because of the use of a solenoid valve, a calibrated ball, detectors, piping, etc. Another method is described in the document FR-A1- 2,636,884 [3]. This process is based on the evolution of the operating pressure as a function of the ink temperature by imposing a constant jet speed.
    [0003] This process not only ensures ink quality servo but also provides a temperature-independent print quality through constant jet speed. It also realizes a measurement of the speed of the jet. The operating curve, which is the set quality of the ink, takes into account both the viscosity and the density of the ink.
    [0004] This process requires the intervention of the operator and the establishment of the reference pressure is achieved by varying the operating temperature of reference machines. EP-A1-1,048,470 [4], also published as US-B1-6,450,601 discloses a method for managing the quality of the ink in an ink jet printer, in which there is available information relating to the ink pressure P, the temperature T and the jet velocity V and a pressure setpoint curve Pset as a function of the temperature T and the speed V, for each of the inks qualified for this model of 'printer. It is therefore noted that the ink quality management of an inkjet printer as a function of temperature often involves the management of the viscosity of the ink as a function of temperature. The viscosity of the ink of an ink jet printer depends on the constituents that go into the composition of the ink. Thus, inks for ink jet printers generally contain a solvent or solvent mixture in which are dissolved or dispersed, colorants, binders, generally polymeric, and various other additives in minor amounts. . The binders have the function of coating the dyestuffs and the adhesion of the ink to the various substrates to be marked. The binders have the effect of increasing the viscosity of the solvent or solvent mixture. The solvent (s) can be water or all kinds of organic solvents, with different volatility depending on the objective set by the formulator. Many inks have the same solvents whereas these inks also have very different binders and dyestuff compositions.
    [0005] The viscosity management of inks by inkjet printers requires storing in memory the viscosity of each ink used or likely to be used in the printer as a function of temperature. It is therefore necessary to establish reference curves for each of these inks and then to memorize these curves in the memory of the printer. This is the case in the documents [1], [2], [3], [4], cited above. The establishment of these curves requires a large number of measurements of the viscosity as a function of temperature for each of the inks. The number of inks used by an inkjet printer can be high which multiplies the number of measurements to be made.
    [0006] The operation of programming the printer memories with such a large amount of information specific to each of the inks used is also time consuming and tedious. In addition, each time a new ink is used in the printer, the specific curve giving the viscosity of this specific ink as a function of the temperature must be established and the data thus collected collected in the printer memory. Thus, in view of the foregoing, there is a need for a method of managing the ink quality of an inkjet printer as a function of temperature using the viscosity management of the ink. temperature-dependent ink which does not require the establishment of reference curves giving the viscosity as a function of temperature for each of the specific inks used or likely to be used in the printer, as well as the storage of these curves in the printer memory. The object of the present invention is, inter alia, to provide a method for managing the ink quality of an ink jet printer as a function of temperature, using the viscosity management of the ink. ink according to the temperature that meets this need. SUMMARY OF THE INVENTION This and other objects are achieved according to the invention by a method of quality management of ink of an ink jet printer as a function of temperature. using the management of the viscosity of the ink as a function of temperature, said ink comprising a solvent or a mixture of solvents and said solvent or solvent mixture representing at least 50% by mass of the total mass of the ink wherein the viscosity of the ink at a temperature T is calculated from the following parameters: The viscosity of the ink at a single reference temperature Tref; Parameters K or Ln (K), and -E / R of the equation giving the viscosity of the solvent or solvent mixture: Ln (solvent viscosity) = Ln (K) -E / RT (1) where E is the Arrhenius activation energy given in J / mol and R is the perfect gas constant. The usual value of R is 8.314472 Pa.m3. -0.mor .. Advantageously, the calculated viscosity of the ink can be further corrected by using a fourth parameter called correction factor k.
    [0007] Generally, the ink may comprise a solvent or solvent mixture, one or more dyestuff (s), optionally one or more binder (s), and optionally one or more additive (s). The ink may comprise from 40% to 99%, preferably from 50% to 95%, more preferably from 60% to 90% by weight of the solvent or solvent mixture relative to the total mass of the ink. .
    [0008] Advantageously, the viscosity of the ink at the reference temperature is obtained by a measurement made in the laboratory. Preferably, the reference temperature Tref is 20 ° C. Advantageously, the equation giving the viscosity of the solvent or the mixture of solvents: Ln (solvent viscosity) = Ln (K) -E / RT (1) can be determined by measuring the viscosity of the solvent or solvent mixture at several temperatures in the operating temperature range of the printer, for example from 0 ° C to 50 ° C, or from the literature.
    [0009] Advantageously, the viscosity of the ink at the temperature T is calculated by multiplying the viscosity of the ink at the reference temperature by the ratio of the viscosity of the solvent at the temperature T to the viscosity of the solvent or of the solvent mixture. at the reference temperature. Advantageously, the viscosity of each of the inks used in the printer at the reference temperature Tref and the parameters K or Ln (K), and -E / R of the equation giving the viscosity of the solvent or solvent mixture of each of said inks can be stored in the machine memory of the printer, and the curve of variation of the viscosity of the ink in the operating temperature range of the printer is set.
    [0010] If greater precision is desired, then the viscosity of the ink at the temperature T can be calculated by multiplying the viscosity of the ink at the reference temperature Tref by the ratio of the viscosity of the solvent to the temperature T on the viscosity of the solvent or solvent mixture at the reference temperature and further by (1- k) (T-Tref) where k is a correction factor.
    [0011] Advantageously, the correction factor k may have a value between 0 and 0.02, preferably between 5.10-3 and 10-2, for example 0.0047. Advantageously, the correction factor k is determined as follows: the viscosity of each of the inks of a set of inks used in a printer is measured at at least two temperatures, of which the reference temperature Tref, chosen in FIG. the operating temperature range of the printer; The viscosity of each of the inks of the set of inks used in the printer is calculated at said at least two temperatures selected from the operating temperature range of the printer; for each ink and each temperature at which the viscosity was measured and calculated, a correction factor ki is determined, this correction factor ki being such that when multiplying the ink viscosity calculated by (1-ki the measured viscosity is obtained; all the factors ki determined for all the temperatures and inks of the set of inks are averaged, whereby the factor k is obtained. Since the correction factor k has been determined for a given set of inks, considered to be representative of the inks used in a given printer, it is not necessary to recalculate k when a new ink is used in this printer. to use the value of k already calculated. Advantageously, the correction factor k can also be stored in the machine memory of the printer. The viscosity management of the ink can be carried out as follows: During the operation of the printer the viscosity and the temperature T of the ink are measured, the viscosity of the ink measured at the temperature is compared T with the viscosity of the ink calculated at the same temperature T, and: If the viscosity of the measured ink is greater than the viscosity of the calculated ink, then an addition of solvent or solvent mixture is ordered. ink so that the viscosity of the measured ink is equal to the viscosity of the calculated ink; If the viscosity of the measured ink is lower than the viscosity of the calculated ink (it is therefore that there has been a too large addition of solvent or solvent mixture), then the time is expected. necessary for the solvent or solvent mixture to evaporate and the viscosity of the measured ink to be equal to the viscosity of the calculated ink.
    [0012] In other words, if the viscosity measured in operation deviates from the calculated theoretical viscosity curve, it means that the variation of the viscosity, is not "normal", does not come from the variation. the temperature, but rather comes from a loss of solvent or mixture of solvents by evaporation (in case the viscosity increases) or a too large solvent addition (in cases where the viscosity decreases). The method according to the invention has never been described in the prior art as represented in particular by the documents cited above. The method according to the invention meets the needs stated above. In the process according to the invention, the viscosity of the ink at a temperature T is calculated from only three parameters, namely the viscosity of the ink at a single reference temperature Tref and the parameters K or Ln ( K), and -E / R of the equation giving the viscosity of the solvent or solvent mixture. Optionally, a fourth parameter called correction factor k can be used. This correction factor can be the same for all inks.
    [0013] It becomes unnecessary according to the invention, in the most general case where the correction factor k is not used, to measure the viscosity of each ink over the entire operating temperature range of the printer and to store these values in the printer memory. It is sufficient to memorize in the machine memory of the printer the viscosity of each of the inks used or likely to be used in the printer at the reference temperature Tref and the parameters K or Ln (K), and -E / R of the equation giving the viscosity of the solvent or solvent mixture of each of said inks. The process according to the invention is simple, reliable, suitable for all inks, whether the basic solvent is for example water, alcohol, MEK or mixtures of these solvents or others and whatever the other ingredients of the ink. The method according to the invention can be implemented with an inkjet printer comprising a recovery tank, devices for adding solvent and adding ink controlled by a control member by means of solenoid valves, pressure sensors, temperature and jet speed at the outlet of the print head connected to this control member, a pressure regulator.
    [0014] The invention will be better understood on reading the detailed description which follows, especially in connection with particular embodiments in the form of examples. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a graph which gives the viscosity (in cPs) as a function of the temperature (° C) of solvents or solvent mixtures currently used in inks for inkjet printers, namely water, ethanol (EtOH), methyl ethyl ketone (MEK), MEK / EtOH / PMA (methoxypropanol acetate) / methanol (MeOH) (proportions: 68 / 26.6 / 1/4, 4), methyl isopropyl ketone (MIPK), MEK / EtOH mixture (28/7), MEK / 1,2-propanediol / water mixture, EtOH / water mixture (1/1), MEK / PMA (methoxypropanol acetate) (89/11), the mixture EtOH / 1,2 propanediol (88/11). The proportions given are proportions in mass. Figure 2 is a graph which gives the viscosity ratio at temperature T / viscosity at 20 ° C as a function of temperature T (in ° C) of the same solvents or solvent mixtures as those of Figure 1. Figure 3 is a graph which gives the Ln (viscosity) as a function of 1 / T (in K) of the same solvents or solvent mixtures as those of FIG. 1. FIG. 4 is a graph which gives the Ln (viscosity at T viscosity at 20 ° C) as a function of 1 / T (in K) of the same solvents or solvent mixtures as those of Fig. 1. Fig. 5 is a graph which gives the reduced viscosity (Vreduct) or relative viscosity which is equal, at a given temperature, to the ratio of the viscosity of the ink to the viscosity of the solvent or of the solvent mixture of this ink (Vréduced = Vencresolvant) as a function of the temperature (° C), for 29 inks used currently in inkjet printers 25 denoted 5312, 5506, FT265, 5311 inks , 2550, 5153, 5151, 7540, FT128, 5135, 2323, 2702, 5532, 5137, 7703, FT184, 5144M, 2328, 5139, 9155, FT210, 2151, 2160, 5117, FT207, FT248, 2157, 2538 and 2588 .
    [0015] Figure 6 is a graph which gives the ratio of the relative viscosity of the ink to the relative viscosity at 20 ° C versus temperature (in ° C) for 4 inks currently used in jet printers. ink called "low slope" inks. These inks are the inks known as inks 5137, 5139, 5117, and 2160.
    [0016] Figure 7 is a graph which gives the ratio of the relative viscosity of the ink to the relative viscosity at 20 ° C versus temperature (in ° C) for 3 inks currently used in ink jet printers so-called "steep slope" inks. These inks are the inks known as inks 5153, 2538, and 2588. FIG. 8 is a graph which gives the ratio of the relative viscosity of the ink to the relative viscosity at 20 ° C. as a function of temperature (in ° C. ) for 10 inks currently used in inkjet printers called "medium slope" inks. These inks are the so-called inks 5506, 7540, 7703, 9155, FT265, FT248, 5144 M, 2157, 2550, and 5532. FIG. 9 is a graph which gives the measured experimental viscosity (cps) (points - ) and the viscosity calculated according to the invention (points A) as a function of temperature (in ° C) for an ink, called ink 5137, "low slope" whose essential solvent is MEK. 10 is a graph which gives the measured experimental viscosity (in cPs) (points -) and the viscosity calculated according to the invention (points A) as a function of the temperature (in ° C) for an ink, called ink 2538, "steep slope" whose solvent is MEK. FIG. 11 is a graph which gives the measured experimental viscosity (in cPs) (points -) and the viscosity calculated according to the invention (points A) as a function of the temperature (in ° C) for an ink, called ink 7703, the solvent of which is water. FIG. 12 is a graph which gives the measured experimental viscosity (in cPs) (points -) and the viscosity calculated according to the invention (points A) as a function of the temperature (in ° C) for an ink, called 7540 ink, whose solvent is ethanol. 13 is a graph which gives the experimental viscosity (cps) measured (points -) and the calculated viscosity according to the invention (points A) as a function of the temperature (in ° C) for a ink, called FT248 ink, whose solvent is ethanol. Figure 14 is a graph which gives the viscosity (in cPs) as a function of temperature (in ° C) of 29 different inks currently used in inkjet printers 5312, 5506, FT265, 5311, 2550 , 5153, 5151, 7540, FT128, 5135, 2323, 2702, 5532, 5137, 7703, FT184, 5144M, 2328, 5139, 9155, FT210, 2151, 2160, 5117, FT207, FT248, 2157, 2538 and 2588. The FIG. 15 is a graph which gives the experimental viscosity (in cps), measured (points -, curve in solid line), the viscosity calculated according to the invention (thick solid line curve), and the viscosity calculated according to FIG. and further corrected by applying a correction factor (dotted line curve) as a function of temperature (in ° C) for an ink, called ink 5139, the solvent of which is the MEK / methoxypropanol acetate mixture mentioned above. . FIG. 16 is a graph which gives the experimental measured viscosity (in cps), (points -, solid line curve), the viscosity calculated according to the invention (thick solid line curve), and the viscosity calculated according to the invention and further corrected by applying a correction factor (dashed line curve) as a function of temperature (in ° C) for an ink, called ink 5311, whose solvent is the mixture ethanol / propanediol 1-2 cited upper.
    [0017] 17 is a graph which gives the experimental viscosity (in cPs), measured (points -, curve in solid line), the calculated viscosity according to the invention (thick solid line curve), and the viscosity calculated according to the invention and further corrected by applying a correction factor (dashed line curve) as a function of temperature (in ° C) for an ink, called FT128 ink, whose solvent is the ethanol / water mixture mentioned above . DETAILED DESCRIPTION OF PARTICULAR EMBODIMENTS When considering the curves which give the viscosity as a function of the temperature of the basic ink solvents for inkjet printers, such as water, alcohol (ethanol) and the methyl ethyl ketone (MEK), which can be found in the literature, it is found that the variations in the viscosity of the solvents as a function of temperature are of the same order as those of the corresponding inks in relative values. . All the curves which give the viscosity as a function of the temperature of the inks which are necessary for the correct operation of the current inkjet printers have therefore been collected. More precisely, it is the raw data relating to the viscosity as a function of the temperature of 29 different inks known as inks 5312, 5506, FT265, 5311, 2550, 5153, 5151, 7540, FT128, 5135, 2323, 2702, 5532, 5137. , 7703, FT184, 5144M, 2328, 5139, 9155, FT210, 2151, 2160, 5117, FT207, FT248, 2157, 2538 and 2588, which have been collated on the same graph, FIG. that the viscosities of the inks vary between 0 and 50 ° C by a factor of about 2 to 4, and from 2 to more than 6 for some inks. Since these inks do not all have the same viscosity at the reference temperature of 20 ° C, they can be compared more easily by dividing the viscosity at a temperature T by the viscosity at 20 ° C for each ink. The values thus obtained have been collected on the same graph, which is not reproduced here because of its complexity. The curves which give the viscosity, as a function of temperature, of the solvents or solvent mixtures of these inks are given in FIG. 1. These curves have been extracted from the literature or, in particular for solvent mixtures, established from viscosity measurements made in the laboratory. These solvents are water, ethanol (EtOH), methyl ethyl ketone (MEK), MEK / EtOH / methoxypropanol acetate or PMA / Methanol (MeOH) (68 / 26.6 / 1 / 4.4 ), the MEK / 1,2-propanediol / water mixture, the EtOH / water mixture (1/1), the MEK / methoxypropanol acetate mixture (89/11), the methyl isopropyl ketone (MiPK), the EtOH mixture / 1,2 propanediol (88/11), and the MEK / EtOH mixture (28/7). One particular way to compare these curves is to divide them by their viscosity at 20 ° C. In other words, the curves which give the viscosity / viscosity ratio at 20 ° C. are plotted as a function of the temperature (in ° C.) of the abovementioned solvents or solvent mixtures (FIG. 2). In order to be able to calculate the viscosity of the solvents at all intermediate temperatures, these data can be smoothed by an Arrhenius-type equation which is well suited to a reduced temperature range, such as the range of 0 ° C to 50 ° C in question. . The viscosity curve of each solvent that gives the viscosity as a function of the temperature-EIRT can therefore be described by an equation of the type 77 = A .e (1) Let logarithm: Ln (n) = Ln (K) -E / RT (2), where 1-1 is the dynamic viscosity (in cPs) and T is the temperature (in K). We therefore note that only 2 parameters namely Ln (K) and -E / R are involved in this equation. For each of these curves, the ordinate at the origin gives Ln (K) and the slope gives - E / R.
    [0018] Figure 3 is a graph which gives the Ln (viscosity n) versus 1 / T (in K) for the above-mentioned solvents or solvent mixture currently used in inks for ink jet printers. In the same way, the ratio of the viscosity of the solvent to the reference viscosity (for example 20 ° C.) gives logarithms: Ln (viscosity / viscosity at 20 ° C.) = Ln (viscosity) - Ln 20 (viscosity at 20 ° C.). ° C) = Ln (K) -E / RT-Ln (viscosity at 20 ° C). Figure 4 is a graph that gives the Ln (viscosity / viscosity at 20 ° C) versus 1 / T (in K) of the above-mentioned solvents or solvent mixtures currently used in inks for inkjet printers. . When calculating the reduced viscosity (V mediate) or relative viscosity (which is equal, at a given temperature, to the ratio of the viscosity of the ink to the viscosity of the solvent or solvent mixture of that ink either Vreduced = Vencresolvent) at each of the temperatures, for the above-mentioned inks currently used in inkjet printers, the relative viscosity curves of these inks, which are shown in FIG. 5, are then obtained.
    [0019] It can be seen that these reduced viscosity curves for inks are much more linear when compared to viscosity curves with very large curvatures (Figure 14). It can also be seen that the slopes of the curves of FIG. 5 are very similar.
    [0020] If these reduced relative viscosities are brought back to a common value at 20 ° C. by division by the viscosity at 20 ° C., a graph is obtained which gives for each ink mentioned above the ratio of the relative viscosity / relative viscosity. at 20 ° C depending on the temperature (in ° C). This graph is not reproduced here because of its complexity.
    [0021] It can be seen from this graph that most of the variation in the viscosity of the ink is from that of the solvent. It then becomes clear that calculating the relative viscosity removes the contribution of the solvent to the effect of temperature. In other words, if the relative viscosity of an ink as a function of temperature is measured, the curve obtained is almost flat, which shows that the variation of the viscosity with the temperature is essentially due to the solvent and much less other ink ingredients such as dyes and pigments. Indeed, the curves of this graph are close to straight with slopes generally between -0.003 and -0.006 ° C-1.
    [0022] For all these inks, the variation of the relative viscosity is only ± 20% between 0 and 50 ° C., compared to the previously mentioned ratios which were from 2 to more than 6. If now we look more carefully at a beam of curves which gives for each ink the ratio of the relative viscosity / relative viscosity at 20 ° C. as a function of the temperature (in ° C.), it can be seen that there are: a few inks which show slopes of the ratio relatively low viscosities less than -0.004 ° C-1 (Figure 6). - some other inks with steeper slopes, greater than -0.006 ° C-1 (Figure 7). The largest number of inks with intermediate slopes, averaging between -0.0045 and -0.006 ° C-1 (Figure 8). From these observations, the viscosity versus temperature curves can be estimated relatively well by knowing only the viscosity at a single temperature and that of the solvent or solvent mixture (it may even be sufficient to know only the viscosity of the majority solvent of the solvent mixture) at all desired temperatures, i.e. generally within the operating temperature range of the ink jet printer, e.g. 0 ° C to 50 ° vs.
    [0023] In other words, according to the invention the viscosity curve of an ink, for example 0 to 50 ° C can be determined by only 3 parameters and possibly 4 parameters, instead of a complete curve, namely: the viscosity of the ink at 20 ° C; solvent viscosity parameters: Ln (K) and -E / R.
    [0024] If greater precision is desired then a fourth parameter is used: the slope correction factor k. In a simplified embodiment where the viscosity of the ink can be approximated to ± 20%, only 3 factors, parameters, are necessary and sufficient. For greater accuracy of ± 10% or better ± 5%, a fourth factor, namely the correction factor k, is necessary. The calculation of the viscosity of an ink at a temperature T can be expressed in generic terms as follows: Let the viscosity of the ink be the temperature at T; neTref the viscosity of the ink at the reference temperature Tref (for example 20 ° C); read the viscosity of the solvent at the temperature T; nsTref the viscosity of the solvent at the reference temperature Tref (for example 20 ° C); NreT the relative viscosity of the ink at the temperature T: 3025454 laughing And similarly nreTref the restricted, relative viscosity of the ink at the reference temperature Tref (e.g. 20 ° C) 5 The ratio n eT / neTref is a function of the temperature f (T) It has been shown that: Tire = 1 - kx (T - Tref rireref The ratio 10 will read / _ 11 el xr I sTre = f (T) xl 1 sTref / nreTref I 1 sT 11 eTref 11 sT From where: In first approximation with 1 15 And adding the correction on = 1 - kx (T - Tref) rireref 17 eT = n eTref x (1- kx T - Trefj Tire 20 3025454 16 With ri ' Thus, the viscosity curve of an ink at a temperature T can be calculated from only: 1. the viscosity of the ink at a single temperature (Tref) 2. the ratio of the viscosity of the solvent at the same temperature T, to the viscosity of the solvent at the reference temperature Tref.
    [0025] This calculation is made with an approximation of about ± 20%. For a better approximation, we can then add the correction factor k. EXAMPLES.
    [0026] In the examples which follow, the method according to the invention is applied to the calculation of the viscosity of various inks for ink jet printers. To calculate the viscosity of an ink at a given temperature T, the method is simple: 1. Multiply the viscosity of the ink at the reference temperature (20 ° C. for example), by the ratio of the viscosity of the solvent. at the same temperature T on the viscosity of the solvent at the reference temperature (20 ° C.). 2. Correct the result by multiplying it by (1-k) x (T-Tref), where k is a correction factor such as 0.0047.
    [0027] The value of the correction factor k, for example k = 0.0047 is obtained as explained above, averaging the values of the correction factors ki to be applied to the calculated viscosity at a given temperature to obtain the actual viscosity 3025454 17 actually measured at this temperature, on a given ink set representative of the inks. In the examples which follow, the calculation method according to the invention described above is applied to various inks by taking a correction factor k (average correction factor) of 0.0047. 0.0047 is an average value of the correction factor for all the inks tested. EXAMPLE 1 In this example, the calculation method according to the invention, set out above, is applied to a "low slope" ink designated 5137, the solvent of which is MEK. Figure 9 gives the measured viscosity (in cPs) measured (points -) and the viscosity calculated according to the invention (points A) as a function of the temperature (° C) for this ink.
    [0028] EXAMPLE 2 In this example, the calculation method according to the invention, described above, is applied to a "steep slope" ink called 5538, the solvent of which is MEK. Figure 10 gives the measured experimental viscosity (in cPs) (points -) and the calculated viscosity according to the invention (points A) as a function of the temperature (° C) for this ink. Example 3. In this example, the calculation method according to the invention, described above, is applied to an ink called 7703, the solvent of which is water.
    [0029] Figure 11 gives the measured experimental viscosity (in cPs) (points -) and the viscosity calculated according to the invention (points A) as a function of the temperature (° C) for this ink.
    [0030] In this example, the calculation method according to the invention, described above, is applied to an ink called 7540, the solvent of which is alcohol.
    [0031] Figure 12 gives the measured experimental viscosity (in cPs) (points -) and the calculated viscosity according to the invention (points A) as a function of the temperature (° C) for this ink. Example 5
    [0032] In this example, the calculation method according to the invention, described above, is applied to an ink called FT248, the solvent of which is alcohol. Figure 13 gives the measured experimental viscosity (in cPs) (points -) and the viscosity calculated according to the invention (points A) as a function of the temperature (° C) for this ink.
    [0033] EXAMPLE 6 In this example, the method of calculation according to the invention, described above, is applied to an ink called 5139, the solvent of which is the MEK / methoxypropanol acetate mixture mentioned above.
    [0034] FIG. 15 gives the experimental viscosity (in cPs), measured (points -, curve in solid line), the calculated viscosity according to the invention (thick solid line curve), and the calculated viscosity according to the invention and further corrected by applying a correction factor (dotted line curve) as a function of the temperature (in ° C) for this ink.
    [0035] EXAMPLE 7 In this example, the calculation method according to the invention, described above, is applied to an ink called 5311, the solvent of which is the alcohol / propanediol mixture 1-2 mentioned above.
    [0036] FIG. 16 gives the experimental viscosity (in cPs) measured (points - curve in solid line), the calculated viscosity according to the invention (thick solid line curve), and the calculated viscosity according to the invention. and further corrected by applying a correction factor (dotted line curve) as a function of temperature (in ° C) for this ink. Example 8. In this example, the calculation method according to the invention, described above, is applied to an ink called FT128, the solvent of which is the alcohol / water mixture mentioned above. FIG. 17 gives the experimental viscosity (in cps) measured (points - curve in solid line), the viscosity calculated according to the invention (curve in thick solid line), and the viscosity calculated according to the invention and corrected. further by applying a correction factor (dotted line curve) as a function of the temperature (in ° C) for this ink. Examples 1 to 8 provided above show that the process according to the invention gives excellent results since it is found that the experimental viscosity curves, measured, and the viscosity curves calculated according to the invention, and a fortiori the viscosity curves calculated and further corrected according to the invention are almost identical or very close. These examples further show that excellent results are obtained with the process according to the invention regardless of the solvent of the ink whether it is water, MEK or alcohol or solvent mixtures, and whatever ink and ingredients thereof other than the solvent. 30
    权利要求:
    Claims (14)
    [0001]
    REVENDICATIONS1. A method for managing the ink quality of an inkjet printer as a function of temperature by using the viscosity management of the ink as a function of temperature, said ink comprising a solvent or a mixture of solvents and said solvent or solvent mixture representing at least 50% by weight of the total mass of the ink, wherein the viscosity of the ink at a temperature T is calculated from the following parameters: the viscosity of the Tref single reference temperature ink; parameters K or Ln (K), and -E / R of equation (1) giving the viscosity of solvent or solvent mixture: Ln (solvent viscosity) = Ln (K) -E / RT (1) where E is the Arrhenius activation energy given in J / mol and R is the constant of perfect gases.
    [0002]
    The method of claim 1, wherein the calculated viscosity of the ink is further corrected using a fourth parameter called correction factor k.
    [0003]
    The method of claim 1 or 2, wherein the ink comprises a solvent or solvent mixture, one or more dyestuff (s), optionally one or more binder (s), and optionally one or more additive (s).
    [0004]
    The method of any one of the preceding claims, wherein the ink comprises from 40% to 99%, preferably from 50% to 95%, more preferably from 60% to 90% by weight of the solvent or mixture. of solvents relative to the total mass of the ink.
    [0005]
    5. Method according to any one of the preceding claims, wherein the viscosity of the ink at the reference temperature is obtained by a measurement made in the laboratory. 3025454 21
    [0006]
    6. A process according to any one of the preceding claims, wherein the reference temperature Tref is 20 ° C. 5
    [0007]
    A process according to any one of the preceding claims, wherein the equation giving the viscosity of the solvent or solvent mixture: Ln (solvent viscosity) = Ln (K) -E / RT (1) is determined by measuring the viscosity of the solvent or solvent mixture at several temperatures in the operating temperature range of the printer, for example from 0 ° C to 50 ° C, or from the literature.
    [0008]
    A method according to any one of the preceding claims, wherein the viscosity of the ink at the temperature T is calculated by multiplying the viscosity of the ink at the reference temperature by the ratio of the viscosity of the solvent to the temperature. T on the viscosity of the solvent or solvent mixture at the reference temperature.
    [0009]
    The process according to claim 8, wherein the viscosity of the ink at the temperature T is calculated by multiplying the viscosity of the ink at the reference temperature Tref by the ratio of the viscosity of the solvent to the temperature T on the viscosity of the solvent or solvent mixture at the reference temperature and further by (1- k) (T-Tref) where k is the correction factor.
    [0010]
    10. A method according to any one of claims 2 to 9, wherein the correction factor k has a value between 0 and 0.02, preferably between 5.10-3 and 10-2, for example 0.0047.
    [0011]
    11. A method according to any one of claims 2 to 10, wherein the correction factor k is determined as follows: the viscosity of each of the inks of a set of inks used in a printer is measured, at least two temperatures, including reference temperature Tref, selected from the operating temperature range of the printer; the viscosity of each of the inks of the set of inks used in the printer is calculated at said at least two temperatures selected from the operating temperature range of the printer; for each ink and each temperature at which the viscosity has been measured and calculated a correction factor ki is determined, this correction factor ki being such that when multiplying the ink viscosity calculated by (1-ki) obtain the measured viscosity; all the factors ki determined for all the temperatures and inks of the ink set are averaged, whereby the factor k is obtained. 15
    [0012]
    The method of any of claims 2 to 11, wherein the correction factor k is stored in the machine memory of the printer.
    [0013]
    The method of any of the preceding claims, wherein the viscosity of each of the inks used in the printer at the reference temperature Tref and the parameters K or Ln (K), and -E / R of the equation giving the viscosity of the solvent or solvent mixture of each of said inks are stored in the machine memory of the printer, and the curve of variation of the viscosity of the ink in the operating range of the printer is established. 25
    [0014]
    A method according to any one of the preceding claims, wherein during operation of the printer the viscosity and the temperature T of the ink are measured, the viscosity of the ink measured at the temperature T is compared with the viscosity of the ink calculated at the same temperature T, and: - If the viscosity of the measured ink is greater than the viscosity of the calculated ink, then an addition of solvent or solvent mixture is controlled in 3025454 23 l ink so that the viscosity of the measured ink is equal to the viscosity of the calculated ink; or If the viscosity of the measured ink is lower than the calculated ink viscosity, then the time required for the solvent or solvent mixture to evaporate and the viscosity of the measured ink to be equal to the viscosity of the calculated ink.
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    同族专利:
    公开号 | 公开日
    US10144216B2|2018-12-04|
    CN105404480A|2016-03-16|
    EP2995462B1|2019-03-27|
    US20160067962A1|2016-03-10|
    EP2995462A1|2016-03-16|
    FR3025454B1|2016-12-23|
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    2015-09-30| PLFP| Fee payment|Year of fee payment: 2 |
    2016-03-11| PLSC| Search report ready|Effective date: 20160311 |
    2016-09-28| PLFP| Fee payment|Year of fee payment: 3 |
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    2020-10-16| ST| Notification of lapse|Effective date: 20200910 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1458284A|FR3025454B1|2014-09-04|2014-09-04|METHOD FOR MANAGING THE QUALITY OF THE INK OF AN INK JET PRINTER BASED ON TEMPERATURE.|FR1458284A| FR3025454B1|2014-09-04|2014-09-04|METHOD FOR MANAGING THE QUALITY OF THE INK OF AN INK JET PRINTER BASED ON TEMPERATURE.|
    EP15183343.1A| EP2995462B1|2014-09-04|2015-09-01|A method for managing ink quality of an inkjet printer versus temperature|
    US14/844,532| US10144216B2|2014-09-04|2015-09-03|Method for managing ink quality of an inkjet printer versus temperature|
    CN201510560079.8A| CN105404480A|2014-09-04|2015-09-06|Method for managing ink quality of an inkjet printer versus temperature|
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