Drying device, printing device and printing method

Abstract

A drying device is provided. The drying device includes: a conveyor configured to convey a contacted part by contacting the contacted part; and a heater configured to heat the contacted part. The conveyor includes a surface layer in contact with the contacted part. The surface layer includes: a support layer having a surface with a plurality of recesses; and a fluororesin attached to the recesses. The support layer contains aluminum sulfate.

Description

Technical Field

[0001] The invention relates to a drying device, a printing device and a printing method. Background Art

[0002] In a printing device such as an inkjet device, a conveyor for conveying a recording medium (continuous paper, cut paper, etc.) is provided, which conveys the recording medium to a liquid composition applicator for applying a liquid composition (ink, etc.) thereon and a liquid composition heater for heating the applied liquid composition to dry it.

[0003] However, among such conveyors, those that directly contact the area to which the liquid composition has been applied may cause an undesirable phenomenon in which the liquid composition is transferred to the conveyor.

[0004] Patent document 1 discloses a roller for conveying printing materials in a device having a printing function. The roller includes a rod-shaped core and a wire containing fluororesin fibers, which is spirally wound on the outer peripheral surface of the core. The roller is a high-peeling roller that can smoothly convey printing materials and maintain high print image quality.

[0005] Citation List

[0006] Patent Literature

[0007] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2014-156317 Summary of the invention

[0008] Technical issues

[0009] When a heater is installed near a conveyor having a fluororesin surface to increase the surface temperature of the conveyor, the deviation tolerance of the conveyor when conveying the contacted parts increases over time. When a conveyor with a large deviation tolerance is used in a drying device, there is a problem of vibration in the drying device when conveying the contacted parts.

[0010] Solutions to the problem

[0011] According to an embodiment of the present invention, there is provided a drying device, comprising:

[0012] a conveyor configured to convey the contacted part by contacting the contacted part; and

[0013] a heater configured to heat the contacted part,

[0014] Wherein, the conveyor comprises a surface layer in contact with the contacted component, and the surface layer comprises:

[0015] a support layer having a surface having a plurality of recesses; and

[0016] Fluorine resin, attached to the recessed portion,

[0017] Wherein, the supporting layer contains aluminum sulfate.

[0018] Effects of the Invention

[0019] The drying device according to the embodiment of the present invention has an excellent effect of suppressing vibration generated in the drying device during the conveyance of the contacted member. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are intended to depict example embodiments of the present invention and should not be interpreted as limiting the scope thereof. Unless explicitly noted, the accompanying drawings should not be considered to be drawn to scale. Likewise, in several views, the same or similar reference numerals represent the same or similar components.

[0021] [ Figure 1 ]

[0022] Figure 1 is a photograph of a cross section of a support layer having recesses.

[0023] [ Figure 2 ]

[0024] Figure 2 It is a schematic diagram for explaining a printing device using continuous paper.

[0025] [ Figure 3 ]

[0026] Figure 3 It is a schematic diagram explaining the state where the contacted member contacts the conveyor. DETAILED DESCRIPTION

[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present invention.As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0028] In describing the embodiments shown in the drawings, specific terms are used for clarity. However, the disclosure of this specification is not intended to be limited to the specific terms so selected, and it should be understood that each specific element includes all technical equivalents having similar functions, operating in a similar manner and achieving similar results.

[0029] An embodiment of the present invention is described below.

[0030] The drying device of this embodiment includes a conveyor and a heater, as well as other optional components as required.

[0031] First, a conveyor and a heater of a drying device are described, and then the drying device and a printing method using the drying device are described.

[0032] Conveyor

[0033] The conveyor is a component that conveys the contacted component by contacting the contacted component. The conveyor includes a surface layer that contacts the contacted component, and the conveyor preferably includes a substrate on which the surface layer that contacts the contacted component is provided. The conveyor may also include other components as required.

[0034] Surface layer

[0035] The surface layer is a layer in contact with the contacted part, and the surface layer includes: a supporting layer, whose surface has multiple recesses and non-recessed areas other than the recesses; and a fluororesin, which is at least attached to the recesses; if necessary, the surface layer may also include other components.

[0036] Support layer

[0037] The support layer is a layer containing aluminum sulfate (i.e., "aluminum sulfate film"), and may contain other materials as needed. Here, the so-called layer containing aluminum sulfate refers to a layer containing a material obtained by aluminum sulfate treatment, and the so-called aluminum sulfate treatment refers to a treatment in which aluminum is anodized in an aqueous sulfuric acid solution. Therefore, the layer containing the material obtained by aluminum sulfate treatment is a layer containing aluminum oxide, and a sulfur component can be detected. Here, the so-called situation in which the sulfur component can be detected means that data indicating the presence of the sulfur component can be obtained by, for example, performing sulfur component mapping (mapping) on ​​the cross section of the support layer. Specifically, sulfur component mapping can be performed by performing EDS (energy dispersive X-ray spectroscopy) elemental analysis (using Phenom ProX, manufactured by Phenom-World Holding BV) on the cross section of the support layer.

[0038] Whether it is a layer containing aluminum sulfate (i.e., a layer containing aluminum oxide and in which sulfur components can be detected) can be confirmed by, for example, mapping the sulfur component, aluminum component, and oxygen component of the cross section of the support layer to determine whether data of the sulfur component, aluminum component, and oxygen component existing in the same region can be obtained. Specifically, the sulfur component, aluminum component, and oxygen component can be determined by performing EDS (energy dispersive X-ray spectroscopy) elemental analysis (using Phenom ProX, manufactured by Phenom-World Holding BV) on the cross section of the support layer.

[0039] The support layer is a layer containing aluminum sulfate, and a plurality of recesses may be formed on its surface. Preferably, the recesses are formed by aluminum sulfate treatment, and no other treatment for forming the recesses is performed during the manufacturing process. Figure 1 Describe the concave part in detail, Figure 1 is a cross-sectional photograph of a support layer having a concave portion. Figure 1As shown in FIG. 1 , the concave portion is a concave structure formed on the surface of the support layer. Figure 1 As shown, the fluororesin F is attached to the concave portion.

[0040] The following will explain why it is preferable that the fluororesin is attached to the concave portion.

[0041] In this embodiment, a conveyor that transports a contacted part by contacting the contacted part is arranged near a heater, thereby increasing the surface temperature of the conveyor. In the case where only fluororesin is attached to the surface of the conveyor, when the contacted part is transported, the fluororesin attached to the surface of the conveyor softens as the surface temperature of the conveyor rises over time, and when in contact with the contacted part, the fluororesin is scraped off to the contacted part side, and the conveyor is deformed in size over time. In a drying device equipped with such a conveyor with a large deviation tolerance, a large load is easily generated on the bearing part of the conveyor, and the drying device vibrates during the conveyance of the contacted part. This vibration may also cause other problems. For example, when the drying device is used in an inkjet printing device, the ink landing position may deviate due to the vibration.

[0042] On the other hand, in the case where the conveyor of the present embodiment has a recessed portion to which the fluororesin is attached, even when the conveyor is in contact with the contacted part for a long time and the surface temperature is high, the fluororesin can be prevented from being scraped toward the contacted part over time. As a result, the deviation tolerance can be reduced for a long time and the vibration generated in the drying device can be suppressed.

[0043] The surface layer temperature of the conveyor is preferably above 50°C, more preferably above 60°C, and most preferably above 70°C. As the surface layer temperature rises, the friction coefficient of the fluororesin increases, and the vibration becomes larger in the drying device using the previous conveyor, but in the drying device of the present embodiment, even if the surface layer temperature rises, the vibration will not become larger, and the effect difference is more significant. The surface layer temperature of the conveyor is preferably below 200°C, more preferably below 150°C, and most preferably below 100°C. In the case where the contacted part is a recording medium such as paper, when the surface layer temperature is below 200°C, the recording medium will not change color or wrinkle. The surface layer temperature of the conveyor is adjusted by a heater (to be described later) arranged near the conveyor, which is a component independent of the conveyor.

[0044] As long as the fluororesin is attached to the concave part, it does not matter if the fluororesin is attached to the non-concave part. That is, it does not matter whether the fluororesin is attached to the non-concave part or not. However, the area of ​​the fluororesin present in the unit area of ​​the concave part is preferably larger than the area of ​​the fluororesin present in the unit area of ​​the non-concave part. Here, the area of ​​the fluororesin present means the area of ​​the fluororesin present in the surface layer image of the top view. The area of ​​the fluororesin present can be determined by, for example, the following method. First, fluorine component mapping is performed on the surface layer of the conveyor. Specifically, fluorine component mapping can be performed by elemental analysis using EDS (Phenom ProX, manufactured by Phenom-World Holding BV), and then, using the software program ProSuite, the area of ​​the fluororesin present in the unit area of ​​the concave part and the area of ​​the fluororesin present in the unit area of ​​the non-concave part are calculated based on the obtained data. Similarly, the area of ​​the fluororesin present in the unit area of ​​the concave part and the area of ​​the fluororesin present in the unit area of ​​the non-concave part are calculated at 5 randomly selected locations, and the average value of the calculated values ​​is used. Here, the area where the fluorine component exists refers to the area where the fluorine atom concentration is 1% or higher.

[0045] The depth of the concave portion is preferably 0.2 to 2.0 μm, more preferably 0.4 to 1.9 μm, and most preferably 1.1 to 1.6 μm. When the depth of the concave portion is within the above range, the deviation tolerance can be reduced for a longer period of time, and the vibration generated in the drying device can be better suppressed. The depth of the concave portion refers to Figure 1 The length of the vertical line indicated by the arrow is the longest of the vertical lines drawn from the straight line connecting the end points of the recessed portions to the surface of the support layer.

[0046] Preferably, in the top view of the concave portion such as in the photograph, the concave portion includes a plurality of adhesion areas to which the fluororesin is adhered and a plurality of non-adhesion areas (typically, areas where the support layer is exposed) to which the fluororesin is not adhered. At least one of the plurality of non-adhesion areas has a thickness of 0.01-0.03 μm. 2 More preferably, the area of ​​the plurality of non-attached regions is 0.01-0.03 μm 2 When the concave portion includes at least one having a diameter of 0.01-0.03 μm 2 When the non-adhesive area is reduced to a certain area, the area of ​​vacuum contact between the contacted part and the fluororesin can be reduced, and the deviation tolerance can be reduced for a longer time, resulting in better suppression of vibration generated in the drying device.

[0047] The area of ​​the non-adhesive region can be determined, for example, as follows: First, aluminum composition mapping is performed in the concave portion, and specifically, aluminum composition mapping can be performed by performing EDS (energy dispersive X-ray spectroscopy) elemental analysis (using Phenom ProX, manufactured by Phenom-World Holding BV). Next, the area of ​​each non-adhesive region is calculated based on the obtained data using the software program ProSuite, and the measurement area during the calculation is, for example, 10 μm×8 μm.

[0048] The area of ​​at least one non-adhesive region is adjusted to 0.01-0.03 μm 2 There is no particular limitation on the method, for example, a component having a support layer is immersed in a dispersion containing fluororesin particles, the fluororesin is attached to the support layer, and the surface of the component is polished with a soft non-woven fabric with low water absorption. As the above-mentioned non-woven fabric, it is preferred that no fiber residue is produced on the surface of the component, for example, a fluororesin fiber sheet can be cited. The area of ​​the non-attached region is relatively small, because the fluororesin attached to the recessed portion partially maintains the fluororesin particle form since the time of manufacture, and a gap region is formed between a plurality of fluororesin particles, and the area of ​​the gap region is equivalent to the above-mentioned area. Therefore, instead of the above-mentioned immersion, when the fluororesin particles are attached by spraying a dispersion containing fluororesin particles, a non-attached region with the above-mentioned area is not formed. It can be considered that this is because the dispersibility of the fluororesin particles is reduced during spraying compared with the above-mentioned immersion. When the fluororesin particles attached to the support layer are integrated to form a uniform fluororesin layer, a non-attached region with the above-mentioned area is not formed.

[0049] The thickness of the support layer is preferably 25.0 to 35.0 μm. When the thickness of the support layer is 25.0 to 35.0 μm, the rigidity of the conveyor can be realized, and a recess can be formed, and the deviation tolerance can be reduced over a longer period of time, and the vibration generated in the drying device can be further suppressed. The thickness of the support layer can be determined as follows: First, the cross section of the conveyor is mapped with sulfur component, aluminum component, and oxygen component. Specifically, the mapping of sulfur component, aluminum component, and oxygen component is performed by EDS elemental analysis (using Phenom ProX, Phenom-World Holding BV company system), and then, the entire area of ​​the detected sulfur component, aluminum component, and oxygen component is determined as the support layer, and the length of the vertical line drawn from the support layer surface to the substrate in the support layer is measured. Similarly, the length of the vertical line of the support layer is measured at 10 randomly selected points, and the average value of these measured values ​​is used as the thickness of the support layer.

[0050] The support layer is a layer containing aluminum sulfate, and the hardness of the layer can be further increased compared to a layer containing aluminum oxide obtained by a treatment other than aluminum sulfate treatment, thereby increasing the hardness of the conveyor having the support layer. In particular, the Vickers hardness of the conveyor is preferably in the range of 400 to 500 Hv. When the Vickers hardness of the conveyor is in the range of 400 to 500 Hv, the wear of the surface of the conveyor having a concave-convex shape can be prevented. The concave-convex shape has a spacing effect to prevent the fluororesin attached to the concave part from peeling off when the conveyor contacts the contact part, and the deviation tolerance can be reduced for a longer time, and the vibration of the drying device can be further suppressed. The Vickers hardness can be measured according to the test method of Japanese Industrial Standard (JIS) Z2244.

[0051] Fluorine resin

[0052] The fluororesin can improve the lubricity between the conveyor and the contacted member, and since the fluororesin adheres to the recessed portions of the support layer as described above, the deviation tolerance can be reduced over a long period of time, thereby suppressing the vibration generated in the drying device.

[0053] Specific examples of fluororesins include, but are not limited to, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA, melting point: 300-310°C), polytetrafluoroethylene (PTFE, melting point: 330°C), tetrafluoroethylene-hexafluoropropylene copolymer (FEP, melting point: 250-280°C), ethylene-tetrafluoroethylene copolymer (ETFE, melting point: 260-270°C), polyvinylidene fluoride (PVDF, melting point: 160-180°C), polychlorotrifluoroethylene (PCTFE, melting point: 210°C), tetrafluoroethylene-hexafluoropropylene-perfluoroalkyl vinyl ether copolymer (EPE, melting point: 290-300°C) and mixtures containing the above polymers, among which polytetrafluoroethylene (PTFE) is preferred.

[0054] The ratio of the fluororesin presence area to the surface layer area is preferably 15.0% to 30.0%. When the ratio of the fluororesin presence area to the surface layer area is 15.0% or more, the deviation tolerance can be reduced over a longer period of time. When the ratio of the fluororesin presence area to the surface layer area is 30.0% or less, the viscosity caused by the collapse of the fluororesin due to long-term use of the conveyor can be suppressed, and the increase in the deviation tolerance can be suppressed. The ratio of the fluororesin presence area can be determined as follows: First, fluorine component mapping is performed on the surface layer of the conveyor. Specifically, the fluorine component can be determined by performing EDS elemental analysis (using Phenom ProX, manufactured by Phenom-World Holding BV). Then, the software program ProSuite is used to calculate the area ratio of the fluorine component presence area to the surface layer area based on the data obtained. Similarly, at 5 randomly selected locations, the ratio of the area of ​​the fluorine component presence area to the surface layer area is calculated, and the average value of these calculated values ​​is used as the ratio of the area of ​​the fluorine resin presence area to the surface layer area. Here, the fluorine component presence area refers to an area with a fluorine atom concentration of 1% or more. The measurement area in the calculation is, for example, 100 μm×100 μm.

[0055] Substrate

[0056] The substrate is disposed on the side of the surface layer that is not in contact with the contacted part. When manufacturing the conveyor, it is preferred to treat the substrate with aluminum sulfate to form the above-mentioned support layer. For this reason, the material constituting the substrate preferably contains aluminum. In addition, the material constituting the substrate more preferably contains magnesium in addition to aluminum. When aluminum is treated with aluminum sulfate, aluminum oxide grows in a columnar shape. When magnesium is contained, the growth direction of aluminum oxide is disturbed, stress is generated in aluminum oxide, and the surface of the support layer is more rich in concave-convex shapes. When manufacturing the conveyor, it is preferred to treat the substrate with aluminum sulfate. Therefore, the material constituting the substrate preferably contains aluminum. In addition to aluminum, it is more preferred to contain silicon. When silicon is contained, the growth direction of aluminum oxide is disturbed, stress is generated in aluminum oxide, and the surface of the support layer is more rich in concave-convex shapes. Since the surface of the support layer is more rich in concave-convex shapes, due to the concave-convex shapes, when the conveyor contacts the contacted part, it has a spacing effect of preventing the fluororesin attached to the concave part from falling off, and the deviation tolerance can be reduced for a longer time, resulting in better suppression of vibrations generated in the drying device.

[0057] The shape of the substrate is not particularly limited, and preferably a long metal rod, the cross section of which is a roller-shaped cylinder or cylindrical body with a circular cross section. By setting it to the above shape, it can be used as a conveying roller. When a roller-shaped substrate is used, the diameter of the circular cross section is preferably 50 to 600 mm. When the diameter is more than 50 mm, the unit area pressure between the contacted parts can be reduced, and the deviation tolerance can be reduced for a longer time. When the diameter is less than 600 mm, the excessive close contact between the contacted parts can be reduced, and the deviation tolerance can be reduced for a longer time.

[0058] Other components

[0059] The conveyor may include other components as required in addition to the surface layer and the substrate. Examples of other components include, but are not limited to, heaters. The heater refers to a device that applies heat to the contacted component through the surface layer. In one example, the shortest length between the predetermined position of the heater and the surface layer is shorter than the shortest length between the predetermined position of the heater and the contacted component. Therefore, when the conveyor is in the shape of a roller, the heater is arranged inside the roller-shaped substrate, and heat is applied to the contacted component through the substrate and the surface layer. The heater is not particularly limited, and various known devices can be used, and specific examples thereof include heaters and devices for generating hot air.

[0060] However, the conveyor preferably does not include a heater. This is because the heater is provided to directly heat the surface layer, and therefore the temperature of the surface layer is prone to excessive rise. When the conveyor does not include a heater, the excessive rise in the surface layer temperature of the conveyor can be suppressed, for example, the surface layer temperature of the conveyor can be adjusted to below 200°C, below 150°C, or below 100°C.

[0061] Heater

[0062] The heater is a component for heating the contacted part, for example, the heater heats the liquid composition applied to the contacted part to dry it. When the heater heats the contacted part, the internal temperature of the drying device also rises, causing the surface layer of the conveyor to indirectly become a high temperature state (for example, above 50°C). On the other hand, in the case of using the conveyor of the present embodiment having a recessed portion to which the fluororesin is attached, even if the surface temperature of the conveyor rises during use, when the contacted part is conveyed, the fluororesin will not be scraped toward the contacted part side over time, and as a result, the deviation tolerance can be reduced over a long period of time, and the vibration generated in the drying device can be suppressed. The heater is not particularly limited, and various known devices can be used, for example, a general heater and a component that generates hot air can be used.

[0063] The heater is clearly different from the above-mentioned heating device. The heating device is a device that applies heat to the contacted part through the surface layer and is provided as a device constituting the conveyor. The heater is not a component that applies heat to the contacted part through the surface layer, but a component installed in the drying device or printing device as a component independent of the conveyor.

[0064] Drying device

[0065] The drying device of this embodiment is a device including a conveyor and a heater, and dries the contacted member coated with a liquid composition, etc. The drying device can be used in a printing device in combination with a liquid composition applicator that applies a liquid composition to the contacted member.

[0066] Drying device and printing device reference Figure 2 Provide detailed explanation. Figure 2 is a schematic diagram of a printing device using continuous paper. Figure 2 The printing device 100 shown includes a contacted member supplier 1, a liquid composition applicator 2, a heater 3, a conveyor 4, and a contacted member collector 6. The printing device 100 includes a drying device 50, which can be combined with or separated from other components in the printing device 100.

[0067] Contacted parts feeder

[0068] The contacted member supplier 1 is driven to rotate, so that the contacted member 7 wound into a roll is supplied to the conveyance path 8 of the printing device 100. The conveyance direction of the contacted member 7 in the conveyance path 8 is indicated by an arrow D in the figure.

[0069] The rotational drive of the contacted member feeder 1 is adjusted so that the contacted member 7 is conveyed at a high speed of 50 m / min or more.

[0070] The contacted member 7 is a sheet-like object that is continuously conveyed along the conveying direction D in the printing device 100, and a specific example thereof is a recording medium such as continuous paper, but is not limited to roll paper and folded paper folded at a predetermined interval. The contacted member 7 is conveyed along the conveying path 8 between the contacted member feeder 1 and the contacted member collector 6. The length of the contacted member 7 in the conveying direction D is at least longer than the length of the conveying path 8 provided for conveying the contacted member 7 between the contacted member feeder 1 and the contacted member collector 6. The printing device 100 of this embodiment uses the contacted member 7 that is continuous along the conveying direction D in the printing device 100, and conveys the contacted member 7 at a high speed, so that a large tension is applied to the contacted member 7 between the contacted member feeder 1 and the contacted member collector 6.

[0071] Liquid composition applicator

[0072] The liquid composition applicator 2 is an inkjet print head having a plurality of nozzle arrays in which a plurality of nozzles are arranged, and the liquid composition applicator 2 is configured so that the ink is ejected from the nozzles toward a conveying path 8 for conveying the contacted member 7. Thus, the liquid composition applicator 2 sequentially applies magenta (M), cyan (C), yellow (Y), and black (K) inks as liquid compositions to the contacted member 7, and the colors are not limited to these, and may also be white, gray, silver, gold, green, blue, orange, purple, and the like.

[0073] In this embodiment, the case where the liquid composition is ink is illustrated, but the liquid composition is not limited to this, and examples include but are not limited to ink, a pretreatment liquid for coagulating the colorant contained in the ink, a post-treatment liquid for protecting the surface of the applied ink, and a liquid for forming a circuit in which inorganic particles (such as metal particles) are dispersed, etc., which can be appropriately mixed or applied in an overlapping manner.

[0074] In this embodiment, the case where the liquid composition is applied to the contacted part 7 through an inkjet print head is exemplified, but the liquid composition can also be applied by other devices or methods. For example, various known methods such as spin coating, spray coating, gravure roller coating, reverse roller coating and rod coating can be used.

[0075] Heater

[0076] The heater 3 heats the liquid composition applied to the contacted member 7 from the back side of the surface having the liquid composition application area of ​​the contacted member 7. The heater 3 is not particularly limited, and various known devices such as a hot air blower, a dryer that makes the back side of the contacted member 7 contact with a flat heater, etc. can be cited.

[0077] The heater 3 is arranged near the conveyor 4 and is used by raising the surface temperature (50°C or more) of the conveyor 4. When used in an environment with an increased surface temperature, the fluororesin is easily scraped off to the contacted part side as the contacted part is conveyed, and the deviation tolerance of the conveyor becomes significant over time, so it is preferable to use the above-mentioned conveyor.

[0078] Conveyor

[0079] The conveyor 4 is a columnar or cylindrical roller that changes the conveying direction D of the contacted member 7 while conveying the contacted member 7 .

[0080] In the printing device 100, the contact member feeder 1 conveys the contact member 7 at a speed of 50 m / min or more. Figure 2 As shown, when the conveying direction of the contacted part 7 is changed by the conveyor 4, a large pressure is applied between the conveyor 4 and the contacted part 7. As the contacted part is conveyed, the fluororesin is easily scraped toward the contacted part side. As time goes by, the deviation tolerance of the conveyor becomes obvious. Therefore, it is best to use the above-mentioned conveyor.

[0081] Since the printing device 100 continuously conveys the contacted member 7 along the conveying direction D in the printing device 100, a large tension is applied to the contacted member 7 between the contacted member supplier 1 and the contacted member collector 6, such as Figure 2As shown, when the conveying direction of the contacted part 7 to which a large tension is applied is changed by the conveyor 4, a large pressure is applied between the conveyor 4 and the contacted part 7. Thus, as the contacted part is conveyed, the fluororesin is easily scraped toward the contacted part side. As time goes by, the deviation tolerance of the conveyor becomes apparent. Therefore, it is best to use the above-mentioned conveyor.

[0082] When the conveyor 4 is a conveying roller, as Figure 2 As shown, the conveying direction of the contacted member 7 changes as the contacted member 7 is wound on the conveying roller. At this time, the winding rate of the contacted member 7 relative to the conveying roller is preferably 10% or more, more preferably 15% or more, and further preferably 20% or more. When the winding rate is 10% or more, the unit area pressure between the conveying roller and the contacted member 7 is reduced, which can inhibit the fluororesin from being scraped toward the contacted member side over time, and the deviation tolerance of the conveyor is reduced. The winding rate of the contacted member 7 relative to the conveying roller is preferably 90% or less, more preferably 70% or less, and further preferably 50% or less. When the winding rate is 50% or less, the contacted member 7 can be properly conveyed.

[0083] Reference Figure 3 The "winding ratio" in this embodiment will be described in detail. Figure 3 Schematic diagram showing the state of the contacted member and the conveyor. When the contacted member 7 contacts the roller conveyor 4 wound on the conveyor 4, as shown in FIG. Figure 3 As shown, the winding rate is defined as the ratio of the circumferential length X between the end portions 9a, 9b of the conveyor 4 to the total circumferential length of the conveyor 4, wherein the circumferential length X is defined on the side where the contacted component 7 contacts the conveyor 4, and the end portions 9a, 9b are the portions where the contacted component 7 is separated from the conveyor 4.

[0084] Contacted parts collector

[0085] The contacted member collector 6 is rotationally driven to wind up the contacted member 7 on which the liquid composition has been applied into a roll.

[0086] Printing method

[0087] The printing method of this embodiment includes a liquid composition applying step of applying the liquid composition to the contacted member and a drying step of drying the contacted member using the above-mentioned drying device.

[0088] Liquid composition application step

[0089] The liquid composition applying step is a process of applying a liquid composition (eg, ink) to the contacted member 7 supplied from the contacted member supplier 1 , and as a result, a liquid composition applied region is formed on the contacted member 7 .

[0090] Drying Steps

[0091] The drying step is a process of heating the applied liquid composition by using a drying device 50 to dry it after the liquid composition applying step, preferably to make the contacted member 7 non-sticky.

[0092] Liquid composition

[0093] The liquid composition applied to the contacted member is not particularly limited, and examples thereof include ink, a pretreatment liquid for agglomerating a colorant contained in the ink, a posttreatment liquid for protecting the surface of the applied ink, and a liquid for forming a circuit in which inorganic particles (such as metal particles) are dispersed. Known compositions can be suitably used.

[0094] ink

[0095] The constituent materials of the ink, such as organic solvent, water, colorant, resin, wax, and additives are described in detail below.

[0096] Organic solvents

[0097] The organic solvent is not particularly limited, and a water-soluble organic solvent may be used, examples of which include, but are not limited to, polyols, ethers such as polyol alkyl ethers and polyol aryl ethers, nitrogen-containing heterocyclic compounds, amides, amines, and sulfur-containing compounds.

[0098] Specific examples of polyols include, but are not limited to, ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 2,3-butylene glycol, 3-methyl-1,3-butylene glycol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,3-hexanediol, 2,5-hexanediol, 1,5-hexanediol, glycerol, 1,2,6-hexanetriol, 2-ethyl-1,3-hexanediol, ethyl-1,2,4-butanetriol, 1,2,3-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, and 3-methyl-1,3,5-pentanetriol.

[0099] Specific examples of the polyol alkyl ethers include, but are not limited to, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether.

[0100] Specific examples of the polyol aryl ethers include, but are not limited to, ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether.

[0101] Specific examples of the nitrogen-containing heterocyclic compound include, but are not limited to, 2-pyrrolidone, N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, ε-caprolactam, and γ-butyrolactone.

[0102] Specific examples of amides include, but are not limited to, formamide, N-methylformamide, N,N-dimethylformamide, 3-methoxy-N,N-dimethylpropionamide, and 3-butoxy-N,N-dimethylpropionamide.

[0103] Specific examples of amines include, but are not limited to, monoethanolamine, diethanolamine, and triethanolamine.

[0104] Specific examples of the sulfur-containing compound include, but are not limited to, dimethyl sulfoxide, sulfolane, and thiodiethanol.

[0105] Specific examples of other organic solvents include, but are not limited to, propylene carbonate and ethylene carbonate.

[0106] In particular, organic solvents having a boiling point of 250° C. or lower are preferred because they not only function as a wetting agent but also provide good drying properties.

[0107] Preferred organic solvents also include polyol compounds and glycol ether compounds having 8 or more carbon atoms. Specific examples of polyol compounds having 8 or more carbon atoms include, but are not limited to, 2-ethyl-1,3-hexanediol and 2,2,4-trimethyl-1,3-pentanediol.

[0108] Specific examples of the glycol ether compound include, but are not limited to, polyol alkyl ethers such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether; and polyol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether.

[0109] In particular, N,N-dimethyl-β-butoxypropionamide, N,N-dimethyl-β-ethoxypropionamide, 3-ethyl-3-hydroxymethyloxetane, and propylene glycol monomethyl ether can be used alone or in combination. Amide solvents such as 3-butoxy-N,N-dimethylpropionamide and 3-methoxy-N,N-dimethylpropionamide are particularly preferred, which can promote the formation of resin films and show high wear resistance.

[0110] Preferably, the boiling point of the organic solvent is 180-250°C. When the boiling point is 180°C or higher, the evaporation rate during the drying process can be properly adjusted to achieve sufficient leveling, reduce surface unevenness, and improve glossiness. On the contrary, when the boiling point is higher than 250°C, the drying property is low and a long drying time may be required. With the recent development of printing technology, the time required to dry the ink has become a rate determining factor, and the drying time should be shortened. Long drying time is not appropriate.

[0111] The proportion of the organic solvent in the ink is not particularly limited and may be appropriately selected to suit a particular application, but is preferably 10-60% by mass, more preferably 20-60% by mass, for the sake of drying properties and discharge reliability of the ink.

[0112] The proportion of the amide solvent in the ink is preferably 0.05 to 10% by mass, more preferably 0.1 to 5% by mass.

[0113] water

[0114] The proportion of water in the ink is not particularly limited and may be appropriately selected to suit a particular application, but is preferably 10-90% by mass, more preferably 20-60% by mass, for the sake of ink drying properties and discharge reliability.

[0115] Colorants

[0116] The colorant is not particularly limited, and pigments and dyes can be used as the colorant. Usable pigments include inorganic pigments and organic pigments, which can be used alone or in combination of two or more, and mixed crystals can also be used as pigments.

[0117] Usable pigments include black pigments, yellow pigments, magenta pigments, cyan pigments, white pigments, green pigments, orange pigments, lustrous color pigments (such as gold pigments and silver pigments), and metallic pigments.

[0118] Specific examples of the inorganic pigment include, but are not limited to, titanium oxide, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, chrome yellow, and carbon black produced by known methods such as a contact method, a furnace method, and a thermal method.

[0119] Specific examples of organic pigments include, but are not limited to, azo pigments, polycyclic pigments (phthalocyanine pigments, perylene pigments, perindol pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, indigo pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments), dye chelates (basic dye chelates, acidic dye chelates), nitro pigments, nitroso pigments, and aniline black. Among them, pigments with good affinity for solvents are preferred, and hollow resin particles and hollow inorganic particles can also be used.

[0120] Specific examples of pigments used for black and white printing include, but are not limited to: carbon black (i.e., CI Pigment Black 7) such as furnace black, lamp black, acetylene black and channel black; metals such as copper, iron (i.e., CI Pigment Black 11), titanium oxide; organic pigments such as aniline black (i.e., CI Pigment Black 1).

[0121] Specific examples of pigments for color printing include, but are not limited to, CI Pigment Yellow 1, 3, 12, 13, 14, 17, 24, 34, 35, 37, 42 (yellow iron oxide), 53, 55, 74, 81, 83, 95, 97, 98, 100, 101, 104, 108, 109, 110, 117, 120, 138, 150, 153, 155, 1 80, 185 and 213; CI Pigment Orange 5, 13, 16, 17, 36, 43 and 51; CI Pigment Red 1, 1, 3, 5, 17, 22, 23, 31, 38, 48:2, 48:2 (Permanent Red 2B (Ca)), 48:3, 48:4, 49:1, 52:2, 53:1, 57:1 (Borax Magenta 6B), 60:1, 63:1, 63:2, 64:1, 81, 83, 88, 101 (iron red), 104, 105, 106, 108 (cadmium red), 112, 114, 122 (quinacridone magenta), 123, 104, 146, 149, 166, 168, 170, 172, 177, 178, 179, 184, 185, 190, 193, 202, 207, 208, 209 9, 213, 219, 224, 254 and 264; CI Pigment Violet 1 (Rhodamine Lake), 3, 5:1, 16, 19, 23 and 38; CI Pigment Blue 1, 2, 15 (Phthalocyanine Blue), 15:1, 15:2, 15:3, 15:4 (Phthalocyanine Blue), 16, 17:1, 56, 60 and 63; CI Pigment Green 1, 4, 7, 8, 10, 17, 18 and 36.

[0122] The dye is not particularly limited, and acid dyes, direct dyes, reactive dyes, and basic dyes may be used alone or in combination with other dyes.

[0123] Specific examples of dyes include, but are not limited to: CI Acid Yellow 17, 23, 42, 44, 79 and 142; CI Acid Red 52, 80, 82, 249, 254 and 289; CI Acid Blue 9, 45 and 249; CI Acid Black 1, 2, 24 and 94; CI Food Black 1 and 2; CI Direct Yellow 1, 12, 24, 33, 50, 55, 58, 86, 132, 142 , 144 and 173; CI Direct Red 1, 4, 9, 80, 81, 225 and 227; CI Direct Blue 1, 2, 15, 71, 86, 87, 98, 165, 199 and 202; CI Direct Black 19, 38, 51, 71, 154, 168, 171 and 195; CI Reactive Red 14, 32, 55, 79 and 249; and CI Reactive Black 3, 4 and 35.

[0124] In order to improve image density, fixability and discharge stability, the proportion of the pigment in the ink is preferably 0.1 to 15% by mass, more preferably 1 to 10% by mass.

[0125] The pigment can be dispersed in the ink by any of the following methods: a method of introducing a hydrophilic functional group into the pigment to make it a self-dispersible pigment, a method of dispersing the pigment surface by coating it with a resin, and a method of dispersing it using a dispersant.

[0126] Examples of methods for introducing a hydrophilic functional group into a pigment to make a self-dispersible pigment include a method in which a functional group such as a sulfonic group or a carboxyl group is added to a pigment (eg, carbon) and dispersed in water to make a self-dispersible pigment.

[0127] As a method for dispersing the pigment surface by coating it with resin, a method can be cited in which the pigment is contained in a microcapsule and can be dispersed in water. In other words, this can be said to be a resin-coated pigment. In this case, it is not necessary for all the pigments in the ink to be coated with resin, and the uncoated pigment or the partially coated pigment can be dispersed in the ink.

[0128] Examples of the method of dispersing the mixture using a dispersant include a method of dispersing the mixture using a known low-molecular-weight dispersant represented by a surfactant or a high-molecular-weight dispersant.

[0129] As the dispersant, any of anionic surfactants, cationic surfactants, amphoteric surfactants and nonionic surfactants can be used, for example, depending on the properties of the pigment.

[0130] For example, RT-100 (nonionic surfactant) manufactured by Takemoto Oil & Fats Co., Ltd. and sodium naphthalenesulfonate formaldehyde condensate are preferably used.

[0131] The dispersants may be used alone or in combination of two or more.

[0132] Pigment dispersion

[0133] The ink can be obtained by mixing the pigment with other materials such as water and an organic solvent. The ink can also be obtained by first mixing the pigment with water, a dispersant, etc. to prepare a pigment dispersion, and then mixing the pigment dispersion with other materials such as water and an organic solvent.

[0134] The pigment dispersion can be obtained by mixing water, a pigment, a pigment dispersant, and other components (if any) to disperse the pigment, and adjusting the particle size of the pigment. Dispersion by a dispersant is preferred.

[0135] There is no particular restriction on the particle size of the pigment dispersed in the pigment dispersion. In order to improve the dispersion stability of the pigment, the ejection stability of the ink, the image quality such as image concentration, it is preferably 20 to 500 nm, and more preferably 20 to 150 nm. It can be measured using a particle size analyzer (NANOTRACK Wave-UT151, manufactured by Microtrac BEL).

[0136] The proportion of the pigment in the pigment dispersion is not particularly limited and may be appropriately selected to suit a particular application, but is preferably 0.1 to 50% by mass, more preferably 0.1 to 30% by mass, in order to improve discharge stability and increase image density.

[0137] The pigment dispersion is preferably filtered using a filter or a centrifuge to remove coarse particles and then degassed.

[0138] Resin

[0139] The type of resin contained in the ink is not particularly limited and can be appropriately selected to suit a specific application. Specific examples include, but are not limited to, polyurethane resins, polyester resins, acrylic resins, vinyl acetate resins, styrene resins, butadiene resins, styrene-butadiene resins, vinyl chloride resins, acrylic styrene resins, and acrylic silicone resins.

[0140] Resin particles made of these resins can also be used. The resin particles can be dispersed in water as a dispersion medium to make a resin emulsion. The ink can be obtained by mixing the resin emulsion with other materials such as a colorant and an organic solvent. These resin particles can be synthesized or commercially available. The resin particles can include one or two or more resin particles.

[0141] Among them, polyurethane resin particles are preferably used in combination with other resin particles because an image formed with ink containing polyurethane resin particles has large viscosity, thereby reducing anti-blocking property. On the other hand, the large viscosity of polyurethane resin particles enables the image to be firmly formed with improved fixability. In addition, an image formed with ink containing polyurethane resin particles having a glass transition temperature Tg of -20°C to 70°C has greater viscosity, and fixability is further improved.

[0142] Among the above resins, acrylic resin particles containing acrylic resin are widely used due to their excellent discharge stability and low cost, but are preferably used in combination with polyurethane resin particles having elasticity due to their poor friction resistance.

[0143] The volume average particle diameter of the resin particles is not particularly limited and may be appropriately selected to suit a particular application, but is preferably 10 to 1,000 nm, more preferably 10 to 200 nm, particularly preferably 10 to 100 nm for good fixability and high image hardness.

[0144] The particle size was measured using a particle size analyzer (NANOTRACK Wave-UT151, manufactured by Microtrac BEL).

[0145] The proportion of the resin in the ink is not particularly limited and may be appropriately selected to suit a particular application, but is preferably 1 to 30% by mass, more preferably 5 to 20% by mass, for the sake of fixability and storage stability of the ink.

[0146] The particle size of the solid matter in the ink is not particularly limited and can be appropriately selected according to the application. In order to improve the discharge stability and image quality (e.g., image density), the highest frequency of the particle size of the solid matter in the ink is preferably 20 to 1000 nm, more preferably 20 to 150 nm, in terms of the maximum number. The solid matter includes resin particles and pigment particles. The particle size can be measured using a particle size analyzer (NANOTRACK Wave-UT151, manufactured by Microtrac BEL).

[0147] wax

[0148] The inclusion of wax in the ink can improve the anti-slip property, and the use of wax with a resin can improve the glossiness. As the wax, polyethylene wax is preferred. Examples of polyethylene wax include AQUACER 531 (manufactured by BYK Japan), POLYRON P502 (manufactured by Chukyo Oil & Fats Co., Ltd.), AQUAPETRO DP2502C (manufactured by Toyo ADL Co., Ltd.), and AQUAPETRO DP2401 (manufactured by Toyo ADL Co., Ltd.), which can be used alone or in combination.

[0149] The proportion of polyethylene wax in the ink is preferably 0.05% to 2% by mass, more preferably 0.05% to 0.5% by mass. When the proportion is 0.05% to 2% by mass, the friction resistance and glossiness are sufficiently improved, and when the proportion is below 0.45% by mass, the storage stability and discharge stability of the ink are particularly good, and it is more suitable for use in an inkjet system.

[0150] additive

[0151] The ink may also contain surfactants, defoamers, preservatives, fungicides, corrosion inhibitors and / or pH adjusters.

[0152] Contacted parts

[0153] The contacted member is not particularly limited, and recording media such as ordinary paper, glossy paper, special paper, cloth, etc. are particularly suitable. Low-permeability recording media (also called low-absorption recording media) are particularly suitable. The so-called low-permeability recording media refers to recording media with low moisture permeability, absorptivity or adsorption on the surface, including materials with a plurality of hollow spaces that are not open to the outside, examples of which include but are not limited to coated paper used in commercial printing, and recording media such as paperboards with waste paper pulp mixed in the middle layer and the back layer and provided with a coating on the surface.

[0154] Low-permeability recording media have a stronger gripping force than recording media such as ordinary paper. Therefore, as the contacted member is conveyed, the fluororesin is easily scraped toward the contacted member. As time goes by, the deviation tolerance of the conveyor becomes significant. Therefore, it is preferable to use the above-mentioned conveyor.

[0155] Low permeability recording media

[0156] Examples of the low-permeability recording medium include, but are not limited to, a recording medium having a supporting substrate, a surface layer provided on at least one surface of the supporting substrate, and optionally other layers, such as coated paper.

[0157] In a recording medium having a supporting substrate and a surface layer, the amount of pure water transferred to the recording medium measured by a dynamic scanning absorptometer during a contact time of 100 ms is preferably 2 to 35 mL / m 2 , more preferably 2 to 10 mL / m 2 .

[0158] If the amount of pure water transferred within the contact time of 100ms is too small, beading (a phenomenon in which adjacent dots attract each other, making the image surface rough) is likely to occur. If the amount of pure water transferred is too large, the diameter of the ink dots in the image may be smaller than the desired diameter.

[0159] The amount of pure water transferred to the recording medium during a contact time of 400 ms as measured by a dynamic scanning absorptometer is preferably 3 to 40 mL / m 2 , more preferably 3 to 10 mL / m 2 .

[0160] If the amount of pure water transferred within the contact time of 400 ms is too small, the drying property is insufficient, and if it is too large, the glossiness of the image after drying may decrease. The amount of pure water transferred within the contact time of 100 ms or 400 ms was measured on the surface of the recording medium having a surface layer.

[0161] Dynamic scanning ablation ("DSA") is an instrument that can accurately measure the amount of liquid absorbed in a very short time. As shown in the paper entitled "Development and Application of Dynamic Scanning Ablation Meter - Automation and Improvement of Bristow Measurement" (Kong Xian Zhongze, Journal of Paper Technology Association, Volume 48, 1994, No. 5, P88-92), the dynamic scanning ablation meter directly measures the liquid absorption rate by tracking the movement of the meniscus in the capillary, spirally scanning the aspiration head of the disk-shaped sample, and automatically changing the scanning speed according to a predetermined pattern to measure the required number of points on a single sample.

[0162] The liquid supply head that supplies liquid to the paper sample is connected to the capillary through a TEFLON (registered trademark) tube, and the position of the meniscus is automatically tracked by an optical sensor, specifically a dynamic scanning aspirometer K350 series D (manufactured by Kyowa Seiko Co., Ltd.) is used to measure the transfer amount of pure water or ink.

[0163] The transfer amount at the contact time of 100 ms or 400 ms can be obtained by interpolating the measured value of the transfer amount at the contact time adjacent to the respective contact times.

[0164] Support substrate

[0165] The supporting substrate is not particularly limited and may be appropriately selected to suit a particular application, examples of which include, but are not limited to, sheet materials such as wood fiber-based paper and nonwoven fabrics based on wood fibers and synthetic fibers.

[0166] The thickness of the support substrate is not particularly limited and may be appropriately selected to suit a particular application, but is preferably 50 to 300 μm.

[0167] The weight per unit area of ​​the supporting substrate is preferably 45-290 g / m 2 .

[0168] Surface layer

[0169] The surface layer contains a pigment and a binder, and may contain a surfactant and other components as necessary.

[0170] As the pigment, an inorganic pigment can be used, or an inorganic pigment and an organic pigment can be used in combination. Specific examples of the inorganic pigment include, but are not limited to, kaolin, talc, heavy calcium carbonate, light calcium carbonate, calcium sulfite, amorphous silica, titanium dioxide, magnesium carbonate, titanium dioxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, and chlorite. The addition amount of the inorganic pigment is preferably 50 parts by mass or more relative to 100 parts by mass of the binder.

[0171] Specific examples of organic pigments include, but are not limited to, water-soluble dispersions of styrene-acrylic copolymer particles, styrene-butadiene copolymer particles, polystyrene particles, and polyethylene particles. The amount of organic pigment added is preferably 2-20 parts by mass relative to 100 parts by mass of all pigments in the surface layer.

[0172] As the binder, it is preferred to contain an aqueous resin. As the aqueous resin, it is preferred to use at least one of a water-soluble resin and a water-dispersible resin. There is no particular limitation on the water-soluble resin, and it can be appropriately selected according to the purpose, for example, polyvinyl alcohol, cation-modified polyvinyl alcohol, acetal-modified polyvinyl alcohol, polyester, polyurethane, polyester-polyurethane copolymer, etc.

[0173] The surfactant contained in the surface layer as required is not particularly limited and can be appropriately selected to suit a specific purpose. For example, any of anionic surfactants, cationic surfactants, amphoteric surfactants and nonionic surfactants can be used.

[0174] The method for forming the surface layer is not particularly limited and can be appropriately selected to suit a particular application. For example, the method can be such that the liquid constituting the surface layer is impregnated or coated on the supporting substrate. The amount of the liquid constituting the surface layer is not particularly limited and can be suitable for a particular application, but preferably the solid content is 0.5 to 20 g / m 2 , more preferably 1 to 15 g / m 2 .

[0175] Example

[0176] A further understanding of the present disclosure may be obtained through certain specific examples provided below, which are for purposes of illustration only and not limitation.

[0177] Preparation Example of Black Pigment Dispersion

[0178] First, 20 g of carbon black (NIPEX 160, manufactured by Degussa AG, with a BET specific surface area of ​​150 m 2 / g, average primary particle size of 20nm, pH of 4.0, DBP oil absorption of 620g / 100g), 20mmol of the compound represented by the following structural formula (1) and 200ml of ion exchange high-purity water were mixed at room temperature using a Silverson mixer at a rotation speed of 6000rpm.

[0179] When the pH value of the obtained slurry is higher than 4, 20 mmol of nitric acid is added thereto. After 30 minutes, 20 mmol of sodium nitrite dissolved in a small amount of ion exchange high purity water is slowly added to the above mixture. The mixture is heated to 60°C while stirring and reacted for 1 hour. A modified pigment in which a compound represented by the following structural formula (1) is added to carbon black is obtained.

[0180] Next, the pH was adjusted to 10 by adding an aqueous NaOH solution, and a modified black pigment dispersion was obtained after 30 minutes. The modified black pigment dispersion contains a pigment bonded to at least one bisphosphonic acid group or sodium bisphosphonate, and the dispersion was ultrafiltered using a dialysis membrane and then ultrasonically dispersed to obtain a self-dispersible pigment dispersion having a solid pigment content concentration of 16% by mass, wherein the self-dispersible pigment has a bisphosphonate group as a hydrophilic functional group.

[0181] [Chemical formula 1]

[0182]

[0183] Preparation Example of Liquid Composition (Ink)

[0184] 50.00 mass% of a black pigment dispersion (solid pigment content concentration of 16%), 2.22 mass% of polyethylene wax AQUACER 531 (non-volatile component content of 45 mass%, manufactured by BYK Japan), 30.00 mass% of 3-ethyl-3-hydroxymethyloxetane, 10.0 mass% of propylene glycol monopropyl ether, 2.00 mass% of a silicone surfactant (TEGO Wet 270, manufactured by BYK Industries) and an equal amount of ion exchange water were mixed, stirred for 1 hour, and filtered using a membrane filter with an average pore size of 1.2 μm.

[0185] Printing device manufacturing example

[0186] Example 1

[0187] The surface of an aluminum hollow roll substrate (A5052 manufactured by MISUMI Co., Ltd.) with a diameter of 80 mm was subjected to an aluminum anodizing surface treatment (aluminum sulfate treatment) in a sulfuric acid aqueous solution. Specifically, an electrode was attached to the end of the aluminum hollow roll substrate, and the aluminum hollow roll substrate was immersed in a 15 wt % sulfuric acid aqueous solution adjusted to 0° C., with a metal rod as an anode, at 1.0 A / dm 2 The electrolytic treatment was carried out for 0.5 hours at a current density of 1.50 ℃ to precipitate an aluminum sulfate film (a layer containing aluminum oxide and in which sulfur components can be detected) to form a 14 μm thick support layer. After the surface was fully cleaned with pure water, the substrate was immersed in a PTFE dispersion (FLUON, manufactured by AGC Chemical Co., Ltd.) diluted to a solid concentration of less than 10%, and then air-dried. After the air-dried treatment, the hollow roller was rotated at a speed of 10 rpm, and a fluororesin fiber (TOMY FILEC, manufactured by Tomogawa Paper Co., Ltd.) was pressed against the rotating hollow roller, and the hollow roller was wiped and polished to form a conveyor.

[0188] Next, the prepared conveyor was installed in an inkjet printing system equipped with a heater (RICOH ProVC60000, manufactured by RICOH Corporation) to prepare a printing device of Example 1 including a drying device.

[0189] Embodiments 2 to 8

[0190] The same as in Example 1 except that the type of substrate, the time of electrolytic treatment, the resin attachment method, the number of resin attachments, and the number of hollow roller grindings were changed according to Table 1. In Table 1, "sulfuric acid" recorded as one of the electrolytes used for electrolytic treatment refers to "aqueous sulfuric acid solution". In Table 1, "spraying" recorded as one of the resin attachment methods in Examples 5 to 8 refers to a method of forming a coating film by spraying a PTFE dispersion (FLUON, manufactured by AGC Chemical Co., Ltd.) diluted to a solid content concentration of 10% or less on a hollow roller rotating at a speed of 10 rpm using a two-fluid nozzle.

[0191] Comparative Example 1

[0192] According to Table 2, the type of substrate, the time of electrolytic treatment, the method of attaching the resin, the number of times of attaching the resin, the number of times of grinding with the hollow roller were changed, and the type of the electrolyte used for the electrolytic treatment was changed from a sulfuric acid aqueous solution to an oxalic acid aqueous solution, and the same as Example 1. In Table 2, "oxalic acid" recorded as one of the electrolytes used for the electrolytic treatment means "oxalic acid aqueous solution".

[0193] Comparative Example 2

[0194] In Comparative Example 2, a printing apparatus was produced in the same manner as in Example 1, except that an aluminum hollow roll substrate (A5052 manufactured by MISUMI Co., Ltd.) having a diameter of 80 mm was not treated and was used as a conveyor.

[0195] Comparative Example 3

[0196] In Comparative Example 3, a printing device was produced in the same manner as in Example 1, except that an aluminum hollow roller substrate (A5052 manufactured by MISUMI Co., Ltd.) with a diameter of 80 mm was covered with a PFA tube (manufactured by GUNZE Co., Ltd.) with a thickness of 30 μm and the PFA tube was shrunk by heat treatment at 200°C and used as a conveyor.

[0197] In addition, for the printing devices prepared in Examples 1 to 8 and Comparative Examples 1 to 3, the components detected from the support layer of the conveyor, the depth of the recessed portion of the support layer, the ratio of the area where the fluororesin exists to the area of ​​the surface layer, the presence or absence of a non-adherent area (an area in the recessed portion to which the fluororesin is not adhered) with an area of ​​0.01 to 0.03 μm2, the thickness of the support layer and the Vickers hardness of the conveyor are shown in Tables 1 and 2 below.

[0198] In the surface layer of the conveyor of the printing device manufactured in Examples 1 to 8, the area where the fluororesin exists per unit area of ​​the recessed portion is compared with the area where the fluororesin exists per unit area of ​​the non-recessed portion. The area where the fluororesin exists per unit area of ​​the recessed portion is much larger.

[0199] Vibration levels caused in the printing unit when transporting the contacted parts

[0200] As described above, in the printing devices of Examples 1 to 8 and Comparative Examples 1 to 3, respective conveyors are installed, and images are printed on recording media as contacted components using a liquid composition (ink). At this time, the winding rate of the contacted component relative to the conveyor is 20% to 50%. As the recording medium, a roll of LUMI ART GLOSS 130gsm (a low-permeability recording medium with a width of 520.7mm produced by Stora Enso) is used. The length of the roll in the conveying direction is longer than the conveying path length of the printing device.

[0201] First, the roll paper is set in the printing device and the roll paper is conveyed at a speed of 50 m / min with a length of 12 km. Then, the roll paper is conveyed at a speed of 200 m / min, and the vibration amount generated by the printing device during the conveying action is measured according to the measurement method of JIS C 1510, and the evaluation is performed according to the following evaluation criteria. The air intake and exhaust volume of the printing device is adjusted so that the surface layer temperature of the conveyor is 70°C, and the conveying action before evaluation and the conveying action during evaluation are performed. A heat-resistant black belt is attached to the end of the conveyor, and the temperature of the belt is measured with a radiation thermometer to obtain the surface layer temperature.

[0202] Evaluation Benchmarks

[0203] A: The vibration level is 70db or less.

[0204] B: The vibration level is greater than 70db and not greater than 80db.

[0205] C: Vibration level is greater than 80db and not greater than 90db.

[0206] D: Vibration level is greater than 90db.

[0207] Table 1-1

[0208]

[0209] Table 1-2

[0210]

[0211] Table 2

[0212]

[0213] The above embodiments are illustrative, rather than limiting, of the present invention. Therefore, many additional modifications and variations are possible according to the above teachings. For example, within the scope of the present invention, the elements and / or features of the different illustrative embodiments may be combined and / or replaced with each other.

[0214] This application is based on and claims the benefit of priority from Japanese Patent Application No. 2020-091268 filed with the Japan Patent Office on May 26, 2020, the entire contents of which are hereby incorporated by reference.

[0215] Reference numerals list

[0216] 1 Contacted parts feeder

[0217] 2 Liquid composition applicators

[0218] 3 Heater

[0219] 4 Conveyor

[0220] 6 Contacted parts collector

[0221] 7 Contacted parts

[0222] 8 Conveying path

[0223] 9a, 9b End where the contacted part is separated from the conveyor

[0224] 50 Drying device

[0225] 100 Printing device

Claims

1. A drying device, comprising: a conveyor configured to convey the contacted part by contacting the contacted part; as well as a heater configured to heat the contacted part, Wherein, the conveyor comprises a surface layer in contact with the contacted component, and the surface layer comprises: a support layer having a surface having a plurality of recesses; and a fluororesin which is attached to the recessed portion, Wherein, the supporting layer contains aluminum sulfate.

2. The drying device according to claim 1, wherein: The recess has a depth of 0.2 to 2.0 μm.

3. The drying device according to claim 1 or 2, wherein: The ratio of the area where the fluororesin exists to the area of ​​the surface layer is 15.0% to 30.0%.

4. The drying device according to claim 1, in, The recess includes: a plurality of attachment areas to which the fluororesin is attached; as well as a plurality of non-adherent regions to which the fluororesin is not adhered, Wherein, at least one of the plurality of non-attachment regions has a thickness of 0.01 to 0.03 μm. 2 area.

5. The drying device according to claim 1, wherein: The support layer has a thickness of 25.0 to 35.0 μm.

6. The drying device according to claim 1, wherein: The conveyor has a Vickers hardness of 400 to 500 Hv.

7. The drying device according to claim 1, wherein: The conveyor is a roller having a diameter of 50 to 600 mm.

8. The drying device according to claim 1, wherein: The surface of the support layer further has a non-concave portion other than the concave portion, The fluororesin is further attached to the non-recessed portion, and An area where the fluororesin exists per unit area of ​​the recessed portion is larger than an area where the fluororesin exists per unit area of ​​the non-recessed portion.

9. The drying device according to claim 1, wherein: The surface layer may be heated to 50° C. or higher.

10. The drying device according to claim 1, wherein: The contacted member is a recording medium.

11. The drying device according to claim 1, in, The conveyor does not include any heating means for applying heat to the contacted part through the surface layer, The heater is configured to heat the contacted part to dry the contacted part.

12. A printing device comprising: a liquid composition applicator configured to apply the liquid composition to a contacted part; and A drying device according to any one of claims 1 to 11.

13. The printing device according to claim 12, further comprising: a contacted component supplier configured to supply the contacted component; a contacted parts collector configured to collect the contacted parts; and a conveying path through which the contacted member supplied from the contacted member supplying device is conveyed to the contacted member collecting device, in, The length of the contacted member in the conveyance direction of the contacted member is longer than the length of the conveyance path.

14. The printing device according to claim 12 or 13, wherein: The conveyor is configured to convey the contacted member at a conveying speed of 50 m / min or more.

15. A printing method comprising: applying the liquid composition to the contacted part; and The contacted member is dried using the drying device according to any one of claims 1 to 11.

Images