Recording device

Abstract

To provide a recording device with a simple structure that suppresses contamination by ink mist. [Solution] The recording device 10 includes an ink tank 23 for storing ink containing water and resin fine particles, a second transport roller 14A for transporting the sheet 6 in the transport direction, an ink discharge head 22 located downstream of the second transport roller 14A in the transport direction for discharging ink supplied from the ink tank 23 onto the sheet 6, and a fifth transport roller 17A located downstream of the ink discharge head 22 in the transport direction for transporting the sheet 6. The zeta potential of the resin fine particles in the ink is negative. The fifth transport roller 17A is made of a material that becomes positively charged due to friction with the sheet 6.

Description

Technical Field

[0001] The present disclosure relates to a recording apparatus that ejects ink from an ink ejection head.

Background Art

[0002] As a recording apparatus that ejects ink from an ink ejection head, the printer described in Patent Document 1 is known. The printer of Patent Document 1 includes a conveyance roller that conveys a sheet, an ejection head that ejects ink droplets, and a charging brush that abuts against the conveyance roller. The conveyance roller is charged by friction with the charging brush. The conveyance roller is charged to a polarity opposite to that of ink mist generated when ink droplets are ejected from the ejection head. Accordingly, ink mist is collected by the conveyance roller.

Prior Art Literature

Patent Literature

[0003]

Patent Literature 1

Summary of Invention

Problem to be Solved by the Invention

[0004] In the printer described above, a charging brush is disposed to charge the conveyance roller. For this reason, there is a problem that the configuration of the apparatus becomes complicated.

[0005] An object of the present disclosure is to provide a recording apparatus that has a simple structure and suppresses contamination caused by ink mist.

Means for Solving the Problem

[0006] (1) This disclosure relates to a recording device. The recording device includes an ink tank for storing inkjet ink containing water and resin fine particles; a first transport roller for transporting a sheet in a transport direction; an ink ejection head located downstream of the first transport roller in the transport direction for ejecting the inkjet ink supplied from the ink tank onto the sheet; and a second transport roller located downstream of the ink ejection head in the transport direction for transporting the sheet. The zeta potential of the resin fine particles in the inkjet ink is negative. One of the first transport roller and the second transport roller is made of a material that becomes positively charged due to friction with the sheet.

[0007] Since the zeta potential of resin particles in inkjet ink is negative, negatively charged ink mist is easily generated when ink is ejected from the ink ejection head. In the above configuration, one of the first and second transport rollers becomes positively charged due to friction with the sheet, so the negatively charged ink mist is attracted to one of the first and second transport rollers. For this reason, it is not necessary to place a charging member to positively charge one of the first and second transport rollers. Therefore, a simple structure is used, and contamination of the recording device by ink mist is suppressed.

[0008] (2) The recording device may further include a pretreatment liquid tank for storing a pretreatment liquid containing water and resin fine particles, and a pretreatment liquid discharge head located upstream of the ink discharge head in the transport direction for discharging the pretreatment liquid supplied from the pretreatment liquid tank. The zeta potential of the resin fine particles in the pretreatment liquid may be positive. The other of the first transport roller and the second transport roller may be made of a material that becomes negatively charged due to friction with the sheet.

[0009] Since the zeta potential of the resin particles in the pretreatment solution is positive, when the pretreatment solution is discharged from the pretreatment solution discharge head, a positively charged mist of the pretreatment solution is easily generated. For this reason, the mist of the pretreatment solution cannot be adsorbed onto either the positively charged first transport roller or the second transport roller. In the above configuration, the other of the first and second transport rollers becomes negatively charged due to friction with the sheet, so the positively charged mist of the pretreatment solution is adsorbed onto the other of the first and second transport rollers. Therefore, contamination of the recording device by the mist of the pretreatment solution is suppressed. Furthermore, since the zeta potential of the resin particles in the pretreatment solution is positive, and the zeta potential of the resin particles in the inkjet ink is negative, the resin particles of the inkjet ink are easily adsorbed onto the resin particles in the pretreatment solution, improving the adhesion of the ink to the sheet.

[0010] (3) The zeta potential of the resin fine particles in the inkjet ink may be lower than -2mV. The zeta potential of the resin fine particles in the pretreatment solution may be higher than +2mV.

[0011] Because the negative charge of the ink mist becomes stronger, the ink mist is strongly attracted to one of the positively charged first and second conveyor rollers. Because the positive charge of the pretreatment liquid mist becomes stronger, the pretreatment liquid mist is strongly attracted to the other of the negatively charged first and second conveyor rollers.

[0012] (4) The material of the sheet may be PET resin. The material of one of the first conveyor roller and the second conveyor roller may be iron. The material of the other of the first conveyor roller and the second conveyor roller may be fluororesin.

[0013] One of the first and second conveyor rollers tends to become positively charged due to friction with the sheet. The other of the first and second conveyor rollers tends to become negatively charged due to friction with the sheet.

[0014] (5) This disclosure relates to a recording device. The recording device includes an ink tank for storing inkjet ink containing water and resin fine particles; a first transport roller for transporting a sheet in a transport direction; an ink ejection head located downstream of the first transport roller in the transport direction for ejecting the inkjet ink supplied from the ink tank onto the sheet; and a second transport roller located downstream of the ink ejection head in the transport direction for transporting the sheet. The zeta potential of the resin fine particles in the inkjet ink is positive. One of the first transport roller and the second transport roller is made of a material that becomes negatively charged due to friction with the sheet.

[0015] Since the zeta potential of the resin particles in inkjet ink is positive, positively charged ink mist is easily generated when ink is ejected from the ink ejection head. In the above configuration, one of the first and second transport rollers becomes negatively charged due to friction with the sheet, so the positively charged ink mist is attracted to one of the first and second transport rollers. For this reason, it is not necessary to place a charging member to negatively charge one of the first and second transport rollers. Therefore, a simple structure is used, and contamination of the recording device by ink mist is suppressed.

[0016] (6) The recording device may further include a pretreatment liquid tank for storing a pretreatment liquid containing water and resin fine particles, and a pretreatment liquid discharge head located upstream of the ink discharge head in the transport direction for discharging the pretreatment liquid supplied from the pretreatment liquid tank. The zeta potential of the resin fine particles in the pretreatment liquid may be negative. The other of the first transport roller and the second transport roller may be made of a material that becomes positively charged due to friction with the sheet.

[0017] Since the zeta potential of the resin particles in the pretreatment solution is negative, when the pretreatment solution is discharged from the pretreatment solution discharge head, a mist of the negatively charged pretreatment solution is easily generated. For this reason, the mist of the pretreatment solution cannot be adsorbed onto either the first or second transport roller, which is negatively charged. In the above configuration, the other of the first and second transport rollers becomes positively charged due to friction with the sheet, so the negatively charged mist of the pretreatment solution is adsorbed onto the other of the first and second transport rollers. Therefore, contamination of the recording device by the mist of the pretreatment solution is suppressed. Furthermore, since the zeta potential of the resin particles in the pretreatment solution is negative, and the zeta potential of the resin particles in the inkjet ink is positive, the resin particles of the inkjet ink are easily adsorbed onto the resin particles in the pretreatment solution, improving the adhesion of the ink to the sheet.

[0018] (7) The zeta potential of the resin fine particles in the inkjet ink may be higher than +2mV. The zeta potential of the resin fine particles in the pretreatment solution may be lower than -2mV.

[0019] Because the positive charge of the ink mist becomes stronger, the ink mist is strongly attracted to one of the negatively charged first and second conveyor rollers. Because the negative charge of the pretreatment liquid mist becomes stronger, the pretreatment liquid mist is strongly attracted to the other of the positively charged first and second conveyor rollers.

[0020] (8) The material of the sheet may be PET resin. The material of one of the first conveyor roller and the second conveyor roller may be fluororesin. The material of the other of the first conveyor roller and the second conveyor roller may be iron.

[0021] One of the first and second conveyor rollers tends to become negatively charged due to friction with the sheet. The other of the first and second conveyor rollers tends to become positively charged due to friction with the sheet.

[0022] (9) A value obtained by subtracting the HSP value of the sheet from the HSP value of the resin fine particles contained in the pretreatment liquid is 8 MPa 1 / 2 or less.

[0023] Adhesion between the sheet and the resin fine particles in the pretreatment liquid is improved.

[0024] (10) The ink ejection head and the pretreatment liquid ejection head may be located above a conveyance path along which a sheet is conveyed in the conveyance direction. The first conveyance roller and the second conveyance roller may be located above the conveyance path.

[0025] Compared to a case where the first conveyance roller and the second conveyance roller are located below the conveyance path, they are closer to the ink ejection head and the pretreatment liquid ejection head. For this reason, ink mist or pretreatment liquid mist is likely to adsorb to the first conveyance roller and the second conveyance roller.

[0026] (11) A conveyance path along which a sheet is conveyed in the conveyance direction includes: a first conveyance path that extends in a first direction from an upstream side to a downstream side in the conveyance direction and on which the pretreatment liquid ejection head is located; a bent path that is bent so as to make a U-turn from a downstream end of the first conveyance path in a direction opposite to the first direction; and a second conveyance path that extends from a downstream end of the bent path in a second direction opposite to the first direction and on which the ink ejection head is located. One of the first conveyance roller and the second conveyance roller may be located on the second conveyance path in the second direction from the ink ejection head. The other of the first conveyance roller and the second conveyance roller may be located on the first conveyance path in the first direction from the pretreatment liquid ejection head.

[0027] Since the sheet is transported along the second transport path in the second direction, an airflow flowing in the second direction is generated around the ink ejection head. Therefore, the ink mist generated from the ink ejection head tends to flow in the second direction. In the above configuration, one of the first transport roller and the second transport roller is located in the second direction from the ink ejection head in the second transport path. Therefore, the ink mist tends to adhere to one of the first transport roller and the second transport roller. Also, since the sheet is transported along the first transport path in the first direction, an airflow flowing in the first direction is generated around the pre-treatment liquid ejection head. In the above configuration, the other of the first transport roller and the second transport roller is located in the first direction from the pre-treatment liquid ejection head in the first transport path. Therefore, the mist of the pre-treatment liquid tends to adhere to the other of the first transport roller and the second transport roller.

[0028] (12) The recording device may further include a first wiper that contacts one of the first conveyor roller and the second conveyor roller, and a second wiper that contacts the other of the first conveyor roller and the second conveyor roller.

[0029] Ink mist or pretreatment liquid mist adhering to the first conveyor roller is wiped away by the first wiper. Ink mist or pretreatment liquid mist adhering to the second conveyor roller is wiped away by the second wiper. [Effects of the Invention]

[0030] According to this disclosure, contamination by ink mist is suppressed with a simple structure. [Brief explanation of the drawing]

[0031] [Figure 1] Figure 1 is a schematic diagram showing the internal configuration of the recording device 10. [Figure 2] Figure 2 shows whether a material becomes positively or negatively charged due to friction. [Modes for carrying out the invention]

[0032] Preferred embodiments of the present disclosure are described below. It goes without saying that these embodiments are only one embodiment of the present disclosure, and the embodiments can be modified without changing the gist of the present disclosure. In Figure 1, the transport direction of the sheet 6 corresponds to the front-rear direction of the recording device 10. The opposite direction of front is rear. The width direction of the sheet 6 corresponds to the left-right direction of the recording device 10. The opposite direction of left is right. Also, the direction perpendicular to the front-rear and left-right directions corresponds to the up-down direction of the recording device 10. The opposite direction of up is down.

[0033] [Internal configuration of recording device 10] As shown in Figure 1, the recording device 10 comprises a supply unit 11, a winding unit 12, a transport mechanism 40, a pre-treatment liquid discharge head 18, a platen 21, an ink discharge head 22, and a heater 25. The supply unit 11, winding unit 12, transport mechanism 40, pre-treatment liquid discharge head 18, platen 21, ink discharge head 22, and heater 25 are located in the internal space of the housing of the recording device 10.

[0034] The supply unit 11 is located behind the center in the front-to-back direction of the internal space of the housing. The supply unit 11 has a supply shaft 11A and a supply roll 11B. The supply shaft 11A extends in the left-to-right direction. The supply shaft 11A is rotatably supported on the internal frame of the housing. The supply shaft 11A is rotated by a supply motor (not shown).

[0035] The supply roll 11B has a cylindrical shape that extends in the left-right direction. The supply roll 11B holds the sheet 6 wound in a roll. The material of the sheet 6 is, for example, PET resin. The supply roll 11B is fixed to the supply shaft 11A. As a result, the supply roll 11B rotates integrally with the supply shaft 11A around the supply shaft 11A. The supply unit 11 feeds the sheet 6 from the supply roll 11B as the supply shaft 11A rotates. The sheet 6 may also be cut paper cut to a predetermined size.

[0036] The winding unit 12 is located behind the center in the front-to-back direction of the internal space of the housing. The winding unit 12 is located below the supply unit 11. The winding unit 12 winds the sheet 6 fed from the supply unit 11 into a roll. Specifically, the winding unit 12 has a winding shaft 12A and a winding roll 12B.

[0037] The winding shaft 12A extends in the left-right direction. The winding shaft 12A is rotatably supported by the internal frame of the housing. The winding shaft 12A is rotated by a winding motor (not shown). The winding shaft 12A may also be rotated by a supply motor.

[0038] The winding roll 12B has a cylindrical shape that extends in the left-right direction. The winding roll 12B holds the sheet 6 wound in a roll. The winding roll 12B is fixed to the winding shaft 12A. As a result, the winding roll 12B rotates integrally with the winding shaft 12A around the winding shaft 12A. The winding unit 12 winds the sheet 6 onto the winding roll 12B as the winding shaft 12A rotates.

[0039] The sheet 6 is transported from the supply section 11 along a U-shaped transport path 31 to the winding section 12. Specifically, the transport path 31 has a first transport path 32, a bend 33, and a second transport path 34.

[0040] The first transport path 32 has an upper inclined path 32A and an upper straight path 32B. The upper inclined path 32A extends linearly forward and upward from the supply section 11. The upper straight path 32B extends linearly forward along the front-rear direction from the downstream end of the upper inclined path 32A. Forward is an example of the first direction. The curved path 33 curves backward in a U-turn from the downstream end of the upper straight path 32B. Rearward is an example of the second direction.

[0041] The second transport path 34 has a lower straight path 34A and a lower inclined path 34B. The lower straight path 34A extends linearly backward from the downstream end of the curved path 33 along the front-rear direction. The lower inclined path 34B extends linearly backward and downward from the downstream end of the lower straight path 34A to the winding section 12.

[0042] The conveying mechanism 40 conveys the sheet 6, which has been fed out from the supply unit 11, to the winding unit 12 in the conveying direction. The conveying mechanism 40 defines the conveying path 31. Specifically, the conveying mechanism 40 has a first conveying unit 13, a second conveying unit 14, a third conveying unit 15, a fourth conveying unit 16, and a fifth conveying unit 17.

[0043] The first conveying unit 13 is positioned forward and upward from the supply unit 11. The first conveying unit 13 defines the downstream end of the upper inclined path 32A and the upstream end of the upper straight path 32B. The first conveying unit 13 has a first conveying roller 13A and a first pinch roller 13B.

[0044] The first conveyor roller 13A is located above the upper straight path 32B. The first conveyor roller 13A is rotated by a first conveyor motor (not shown). The first pinch roller 13B is located below the upper straight path 32B. The first pinch roller 13B rotates in conjunction with the rotation of the first conveyor roller 13A. The first conveying unit 13 conveys the sheet 6 in the conveying direction by the rotation of the first conveyor roller 13A and the first pinch roller 13B.

[0045] The material of the first conveyor roller 13A and the first pinch roller 13B is not particularly limited. For example, the material of the first conveyor roller 13A and the first pinch roller 13B is iron.

[0046] The second conveying section 14 is positioned forward of the first conveying section 13 at a distance. The second conveying section 14 defines the downstream end of the upper straight path 32B. The second conveying section 14 has a second conveying roller 14A and a second pinch roller 14B.

[0047] The second conveyor roller 14A is located above the upper straight path 32B. The second conveyor roller 14A is rotated by a second conveyor motor (not shown). Alternatively, the second conveyor roller 14A may be rotated by a first conveyor motor. The second pinch roller 14B is located below the upper straight path 32B. The second pinch roller 14B rotates in conjunction with the rotation of the second conveyor roller 14A. The second conveying unit 14 conveys the sheet 6 in the conveying direction by the rotation of the second conveyor roller 14A and the second pinch roller 14B.

[0048] The second conveyor roller 14A is made of a material that becomes negatively charged due to friction with the sheet 6. Whether materials become positively or negatively charged due to friction can be inferred, for example, from the triboelectric series table shown in Figure 2. In this embodiment, the material of the sheet 6 is PET resin. Therefore, the second conveyor roller 14A should be made of a material that is more likely to become negatively charged than the polyester shown in Figure 2. In this embodiment, the material of the second conveyor roller 14A is fluororesin. The second conveyor roller 14A is an example of the other of the first and second conveyor rollers.

[0049] The material of the second pinch roller 14B is made of a material that becomes negatively charged due to friction with the sheet 6. The material of the second pinch roller 14B is, for example, fluororesin. However, the material of the second pinch roller 14B does not have to be made of a material that becomes negatively charged due to friction with the sheet 6.

[0050] The upper wiper 35 is in contact with the second conveyor roller 14A. The upper wiper 35 is located in front of the first conveyor roller 13A. The upper wiper 35 is in contact with the outer circumferential surface of the second conveyor roller 14A. The upper wiper 35 is supported by the internal frame of the housing. The second conveyor roller 14A is rotatable while the upper wiper 35 is in contact with the outer circumferential surface of the second conveyor roller 14A.

[0051] The upper wiper 35 is made of a material that becomes positively charged through friction with the second conveyor roller 14A, so that the negative charge of the second conveyor roller 14A does not disappear. For example, the material of the upper wiper 35 is rubber. The upper wiper 35 is an example of a second wiper.

[0052] The third conveying section 15 is positioned forward and downward from the second conveying section 14. The third conveying section 15 defines the center of the conveying direction in the curved path 33. The third conveying section 15 has a third conveying roller 15A and a third pinch roller 15B.

[0053] The third conveyor roller 15A is located in front of the curved path 33. The third conveyor roller 15A is rotated by a third conveyor motor (not shown). Alternatively, the third conveyor roller 15A may be rotated by a first conveyor motor. The third pinch roller 15B is located behind the curved path 33. The third pinch roller 15B rotates in conjunction with the rotation of the third conveyor roller 15A. The third conveying unit 15 conveys the sheet 6 in the conveying direction by the rotation of the third conveyor roller 15A and the third pinch roller 15B.

[0054] The material of the third conveyor roller 15A and the third pinch roller 15B is not particularly limited. For example, the material of the third conveyor roller 15A and the third pinch roller 15B is iron.

[0055] The fourth conveying section 16 is positioned forward and downward from the third conveying section 15. The fourth conveying section 16 defines the upstream end of the lower straight path 34A. The fourth conveying section 16 has a fourth conveying roller 16A and a fourth pinch roller 16B.

[0056] The fourth conveyor roller 16A is located above the lower straight path 34A. The fourth conveyor roller 16A is rotated by a fourth conveyor motor (not shown). Alternatively, the fourth conveyor roller 16A may be rotated by a first conveyor motor. The fourth pinch roller 16B is located below the lower straight path 34A. The fourth pinch roller 16B rotates in conjunction with the rotation of the fourth conveyor roller 16A. The fourth conveying unit 16 conveys the sheet 6 in the conveying direction by the rotation of the fourth conveyor roller 16A and the fourth pinch roller 16B.

[0057] The material of the fourth conveyor roller 16A and the fourth pinch roller 16B is not particularly limited. For example, the material of the fourth conveyor roller 16A and the fourth pinch roller 16B is iron.

[0058] The fifth conveying section 17 is positioned at a distance behind the fourth conveying section 16. The fifth conveying section 17 defines the downstream end of the lower straight path 34A. The fifth conveying section 17 has a fifth conveying roller 17A and a spur 17B.

[0059] The fifth conveyor roller 17A is located above the lower straight path 34A. The fifth conveyor roller 17A is rotated by a fifth conveyor motor (not shown). The fifth conveyor roller 17A may also be rotated by the first conveyor motor. The spur 17B is located below the upper straight path 32B. The spur 17B rotates in conjunction with the rotation of the fifth conveyor roller 17A. The fifth conveyor unit 17 conveys the sheet 6 in the conveying direction by the rotation of the fifth conveyor roller 17A and the spur 17B.

[0060] The fifth conveyor roller 17A is made of a material that becomes positively charged through friction with the sheet 6. For this reason, the fifth conveyor roller 17A is made of a material that is more easily positively charged than the polyester shown in Figure 2. In this embodiment, the material of the fifth conveyor roller 17A is, for example, iron. The fifth conveyor roller 17A is an example of one of the first and second conveyor rollers.

[0061] The spur 17B is made of a material that becomes positively charged through friction with the sheet 6. The material of the fifth conveyor roller 17A is, for example, iron. Note that the spur 17B does not necessarily have to be made of a material that becomes positively charged through friction with the sheet 6.

[0062] The lower wiper 36 is in contact with the fifth conveyor roller 17A. The lower wiper 36 is located in front of the fifth conveyor roller 17A. The lower wiper 36 is in contact with the outer circumferential surface of the fifth conveyor roller 17A. The lower wiper 36 is supported by the internal frame of the housing. The fifth conveyor roller 17A is rotatable while the lower wiper 36 is in contact with the outer circumferential surface of the fifth conveyor roller 17A.

[0063] The lower wiper 36 is made of a material that becomes negatively charged through friction with the fifth conveyor roller 17A, so as not to cause the positive charge of the fifth conveyor roller 17A to disappear. The material of the lower wiper 36 is, for example, rubber. The lower wiper 36 is an example of a first wiper.

[0064] The pretreatment liquid discharge head 18 is located above the upper straight path 32B. The pretreatment liquid discharge head 18 is located downstream of the first conveying section 13 in the conveying direction. The pretreatment liquid discharge head 18 is located upstream of the second conveying section 14 in the conveying direction. Pretreatment liquid is supplied to the pretreatment liquid discharge head 18 from the pretreatment liquid tank 19. The pretreatment liquid discharge head 18 discharges the pretreatment liquid supplied from the pretreatment liquid tank 19 downwards onto the sheet 6. This pretreatments the upper surface of the sheet 6.

[0065] The pretreatment liquid tank 19 is located in the internal space of the housing. The pretreatment liquid tank 19 is located above the pretreatment liquid discharge head 18. The pretreatment liquid tank 19 stores the pretreatment liquid. The pretreatment liquid tank 19 is connected to the pretreatment liquid discharge head 18 via an upper tube 20. The pretreatment liquid in the pretreatment liquid tank 19 is supplied to the pretreatment liquid discharge head 18 via the upper tube 20.

[0066] The platen 21 is located below the lower straight path 34A. The platen 21 is located downstream of the fourth conveying section 16 in the conveying direction. The platen 21 is located upstream of the fifth conveying section 17 in the conveying direction. The platen 21 is supported by the internal frame of the housing. The platen 21 has a flat plate shape that extends in the front-rear and left-right directions. The upper surface of the platen 21 supports the sheet 6 from below.

[0067] The ink ejection head 22 is positioned above the platen 21 at a distance. The ink ejection head 22 is positioned above the lower straight path 34A. The ink ejection head 22 faces the platen 21 in the vertical direction. Ink is supplied to the ink ejection head 22 from the ink tank 23. The ink ejection head 22 ejects the ink supplied from the ink tank 23 downward onto the sheet 6.

[0068] The ink tank 23 is located in the internal space of the housing. The ink tank 23 is located above the ink ejection head 22. The ink tank 23 stores ink. The ink tank 23 is connected to the ink ejection head 22 via a lower tube 24. The ink in the ink tank 23 is supplied to the ink ejection head 22 via the lower tube 24.

[0069] The heater 25 is located downstream of the ink ejection head 22 in the conveying direction. The heater 25 is located upstream of the fifth conveying section 17 in the conveying direction. The heater 25 is a so-called halogen heater. The heater 25 has a halogen lamp, which is a heating element that emits infrared rays, a reflector, and a housing. Heat from the halogen lamp and reflector is radiated to the outside through the opening in the housing. The heater 25 may also be, for example, a carbon heater, a dryer, an oven, or a belt conveyor oven.

[0070] The heater 25 heats both the sheet 6 and the ink adhering to the sheet 6 as it passes beneath it. Alternatively, the heater 25 may heat only one of the sheet 6 or the ink adhering to the sheet 6. When the ink is heated, the resin fine particles described later soften, forming a film on the sheet 6. After the sheet 6 passes through the heater 25, the film solidifies as it cools naturally. This fixes the ink to the sheet 6.

[0071] [Composition of pretreatment solution] The pretreatment liquid stored in the pretreatment liquid tank 19 contains water, resin microparticles, a surfactant, and a water-soluble organic solvent. The pretreatment liquid may further contain a crosslinking agent, an antifungal agent, a disinfectant, etc. Examples of water include deionized water, distilled water, and pure water. Examples of resin microparticles include acrylic resin, urethane resin, polyester resin, and olefin resin.

[0072] Acrylic resins are obtained using copolymers of acrylic acid ester components, methacrylic acid ester components, and styrene components. Commercially available acrylic resins may also be used. Examples of commercially available products include SE-841A from Taisei Fine Chemical Co., Ltd., Delpet® 60N and 80N from Asahi Kasei Corporation, Diana® BR52, BR80, BR83, BR85, and BR88 from Mitsubishi Chemical Corporation, KT75 from Denka Co., Ltd., and Vinibran® 2680, 2682, 2684, and 2685 from Nisshin Chemical Industry Co., Ltd.

[0073] Urethane resins are obtained by the reaction of polyols with organic polyisocyanates and hydrophilic group-containing compounds. Commercially available urethane resins may also be used. Examples of commercially available products include WBR-016U from Taisei Fine Chemical Co., Ltd., Superflex® 620, Superflex 650, Superflex 500M, and Superflex E-2000 from Daiichi Kogyo Seiyaku Co., Ltd., Permarin® UC-20 from Sanyo Chemical Industries, Ltd., and Parasurf UP-22 from Ohara Palladium Chemical Co., Ltd.

[0074] Polyester resins are obtained by known methods using a polyhydric alcohol component and a polyhydric carboxylic acid component such as a polyhydric carboxylic acid, polyhydric carboxylic acid anhydride, or polyhydric carboxylic acid ester. Commercially available polyester resins may also be used. Examples of commercially available products include Elitel KA-5034, Elitel KA-5071S, Elitel KA-1449, Elitel KA-0134, Elitel KA-3556, Elitel KA-6137, Elitel KZA-6034, Elitel KT-8803, Elitel KT-8701, Elitel KT-9204, Elitel KT-8904, Elitel KT-0507, and Elitel KT-9511, all manufactured by Unitika Ltd.

[0075] Examples of olefin resins include polyethylene, polypropylene, ethylene-propylene copolymers, and random or block copolymers of ethylene and / or propylene with other comonomers. Examples of comonomers include 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, and 1-nonene, which have two or more carbon atoms, and α-olefin comonomers with two to six carbon atoms. Examples of block copolymers include ethylene-propylene-butene copolymers.

[0076] Commercially available olefin resins may be used. Examples of commercially available products include Arrowbase® SB-1200 manufactured by Unitika Ltd., Aurolene® 150A and Aurolene® AE-301 manufactured by Nippon Paper Industries Ltd., Superclon® E-415 manufactured by Nippon Paper Industries Ltd., and Hardlen® Na-1001 manufactured by Toyobo Co., Ltd.

[0077] The content of resin fine particles in the total amount of pretreatment solution is preferably in the range of 1.0% by weight or more and 30.0% by weight or less. More preferably, the content of resin fine particles in the total amount of pretreatment solution is in the range of 2.0% by weight or more and 20.0% by weight or less.

[0078] The zeta potential of the resin microparticles in the pretreatment solution is positive. Preferably, the zeta potential of the resin microparticles in the pretreatment solution is higher than +2mV. More preferably, the zeta potential of the resin microparticles in the pretreatment solution is higher than +5mV. Furthermore, it is preferable that the zeta potential of the resin microparticles in the pretreatment solution is less than +60mV. The zeta potential is a physical property value that serves as an indicator of the charged state of the particle surface. The zeta potential can be measured, for example, by electrophoretic light scattering. The zeta potential can be measured, for example, by a zeta potential measuring device manufactured by Otsuka Electronics Co., Ltd.

[0079] The value obtained by subtracting the HSP value of sheet 6 from the HSP value of resin microparticles contained in the pretreatment solution is 8 MPa. 1 / 2 The following is preferable: The value obtained by subtracting the HSP value of sheet 6 from the HSP value of resin fine particles contained in the pretreatment solution is 8 MPa. 1 / 2 The following conditions improve the adhesion between sheet 6 and the pretreatment solution. HSP stands for Hansen solubility parameter. The Hansen solubility parameter is an index of solubility that indicates how well one substance dissolves in another. For example, substances with similar HSP values ​​dissolve well together.

[0080] The value obtained by subtracting the HSP value of Sheet 6 from the HSP value of the resin microparticles contained in the pretreatment solution can be calculated using, for example, calculation software from HSPiP or Pirika.com. Specifically, first, the HSP values ​​of the resin microparticles in the pretreatment solution and the HSP value of Sheet 6 are calculated using the above calculation software. Next, the above value is calculated by subtracting the HSP value of Sheet 6 from the HSP value of the resin microparticles in the pretreatment solution.

[0081] Examples of surfactants include anionic surfactants, cationic surfactants, nonionic surfactants, betaine surfactants, silicone-based surfactants, fluorine-based surfactants, and acetylene glycol-based surfactants.

[0082] The water-soluble organic solvent preferably includes, for example, glycols and alkanediols.

[0083] Examples of glycols include ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, tripropylene glycol, tetraethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, neopentyl glycol glycerin, trimethylolethane, trimethylolpropane, tributylolpropane, pentaerythritol, and polyfunctional glycols containing sorbitol.

[0084] Examples of alkanediols include 1,2-butanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,2-pentanediol, 1,5-pentanediol, 2-methyl-2,4-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,2-hexanediol, 1,8-octanediol, 1,2-octanediol, and 1,9-nonanediol. Examples include ol, 3-methyl-1,5-pentanediol, 2-methyl-1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, 2,2-dibutyl-1,3-propanediol, 2-methyl-2,4-pentanediol, 2-methyl-1,8-octanediol, 1,4-cyclohexanediol, and 1,4-cyclohexanedimethanol.

[0085] From the viewpoint of improving the wettability of the pretreatment solution to the sheet 6, the content of the water-soluble organic solvent in the total amount of the pretreatment solution is preferably within the following ranges. For example, the content of the water-soluble organic solvent in the total amount of the pretreatment solution is preferably within the range of 10.0% by weight or more and 40.0% by weight or less. More preferably, the content of the water-soluble organic solvent in the total amount of the pretreatment solution is within the range of 10.0% by weight or more and 30.0% by weight or less.

[0086] [Ink composition] The ink stored in the ink tank 23 is an aqueous ink containing resin-dispersed pigment, resin fine particles, a water-soluble organic solvent, and water. This ink is an example of an inkjet ink.

[0087] Resin-dispersed pigments include a pigment and a pigment-dispersing resin for dispersing the pigment in water. Resin-dispersed pigments are not particularly limited. For example, resin-dispersed pigments include carbon black, inorganic pigments, and organic pigments. Examples of carbon black include furnace black, lamp black, acetylene black, and channel black.

[0088] Examples of inorganic pigments include titanium dioxide, iron oxide-based inorganic pigments, and carbon black-based inorganic pigments. Examples of organic pigments include azo pigments such as azo lakes, insoluble azo pigments, condensed azo pigments, and chelate azo pigments. Examples of organic pigments include polycyclic pigments such as phthalocyanine pigments, perylene and perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, thioindigo pigments, isoindolinone pigments, and quinophthalone pigments. Examples of organic pigments include dye lake pigments such as basic dye-type lake pigments and acid dye-type lake pigments. Examples of organic pigments include nitro pigments, nitroso pigments, and aniline black daylight fluorescent pigments.

[0089] Examples of resin-dispersed pigments other than those listed above include CI Pigment Black 1, 6 and 7; CI Pigment Yellow 1, 2, 3, 12, 13, 14, 15, 16, 17, 55, 73, 74, 75, 78, 83, 93, 94, 95, 97, 98, 114, 128, 129, 138, 150, 151, 154, 180, 185 and 194; CI Pigment Orange 31 and 43; CI Pigment Red 2, 3, 5, 6, 7, 12, 15, 16, 48, 48:1, 48:3, 53:1, 5 Examples include 7, 57:1, 112, 122, 123, 139, 144, 146, 149, 150, 166, 168, 175, 176, 177, 178, 184, 185, 190, 202, 209, 221, 222, 224, 238 and 254; CI Pigment Violet 19 and 196; CI Pigment Blue 1, 2, 3, 15, 15:1, 15:2, 15:3, 15:4, 16, 22 and 60; CI Pigment Green 7 and 36; and solid solutions of these pigments. In addition to resin-dispersed pigments, the ink may also contain other pigments and dyes.

[0090] The content of resin-dispersed pigment in the total amount of water-based ink is not particularly limited. The content of resin-dispersed pigment in the total amount of water-based ink is appropriately determined, for example, by the desired optical density or saturation. Preferably, the content of resin-dispersed pigment is in the range of 0.1% by weight or more and 20% by weight or less. More preferably, the content of resin-dispersed pigment is in the range of 0.3% by weight or more and 15% by weight or less. Particularly preferably, the content of resin-dispersed pigment is in the range of 0.5% by weight or more and 10% by weight or less. One type of resin-dispersed pigment may be used alone, or two or more types may be used in combination.

[0091] The resin microparticles can be, for example, those containing either methacrylic acid or acrylic acid as a monomer. Commercially available resin microparticles may also be used. The resin microparticles may further contain, for example, styrene or vinyl chloride as monomers. The resin microparticles may also be, for example, those contained in a resin emulsion. A resin emulsion is composed of, for example, resin microparticles and a dispersion medium such as water. The resin microparticles are not dissolved in the dispersion medium, but are dispersed within a specific particle size range. In other words, a resin emulsion is an emulsion in which resin microparticles are dispersed in a dispersion medium.

[0092] Examples of resin fine particles contained in the resin emulsion include acrylic acid resins, maleic acid ester resins, vinyl acetate resins, carbonate-type resins, polycarbonate-type resins, styrene-type resins, ethylene-type resins, polyethylene-type resins, propylene-type resins, polypropylene-type resins, urethane-type resins, polyurethane-type resins, polyester-type resins, and copolymer resins of the above resins.

[0093] The glass transition temperature of the resin fine particles is 33°C or higher. Hereafter, the glass transition temperature will be denoted as Tg. The Tg of the resin fine particles is preferably in the range of 33°C to 112°C. More preferably, the Tg of the resin fine particles is in the range of 33°C to 90°C. Particularly preferably, the Tg of the resin fine particles is in the range of 40°C to 80°C. If resin fine particles with a Tg of 33°C or higher are used, an ink with excellent fixation properties can be obtained on sheet 6.

[0094] As the resin emulsion, commercially available products may be used, for example. Examples of commercially available products include "Hyros-X (registered trademark) KE-1062" (Tg: 112℃) and "Hyros-X (registered trademark) QE-1042" (Tg: 69℃) from Seikoh PMC Co., Ltd., "Movinyl (registered trademark) 6969D" (Tg: 77℃), "Movinyl (registered trademark) 5450" (Tg: 53℃), and "Movinyl (registered trademark) DM774" (Tg: 33℃) from Japan Coating Resin Co., Ltd., and "Superflex (registered trademark) 150" (Tg: 40℃) from Daiichi Kogyo Seiyaku Co., Ltd. Resin fine particles are an example of a water-dispersible resin.

[0095] The content of resin fine particles in the total amount of water-based ink is not particularly limited. Preferably, the content of resin fine particles in the total amount of water-based ink is in the range of 0.1% by weight or more and 30% by weight or less. More preferably, the content of resin fine particles is in the range of 0.5% by weight or more and 20% by weight or less. Particularly preferably, the content of resin fine particles is in the range of 2.5% by weight or more and 14.5% by weight or less. One type of resin fine particle may be used alone, or two or more types may be used in combination. Note that the content of resin fine particles does not include resin-dispersed pigment and water. Furthermore, the total content of resin fine particles and resin-dispersed pigment in the total amount of water-based ink is preferably in the range of 3% by weight or more and 15% by weight or less.

[0096] The zeta potential of resin microparticles in aqueous ink is negative. Preferably, the zeta potential of resin microparticles in aqueous ink is less than -2mV. More preferably, the zeta potential of resin microparticles in aqueous ink is less than -5mV. Furthermore, it is preferable that the zeta potential of resin microparticles in aqueous ink is -60mV or higher. The zeta potential is a physical property value that serves as an indicator of the charge state of the particle surface. The zeta potential can be measured, for example, by electrophoretic light scattering. The zeta potential can be measured, for example, by a zeta potential measuring device manufactured by Otsuka Electronics Co., Ltd.

[0097] The water-soluble organic solvent prevents the ink from drying out at the nozzle tip of the ink ejection head 22, for example. Examples of water-soluble organic solvents include propylene glycol, glycerin, triethylene glycol, butylene glycol, dipropylene glycol, tripropylene glycol, thiodiglycol, trimethylolpropane, trimethylolethane, polyethylene glycol, and polypropylene glycol. One type of organic solvent may be used alone, or two or more types may be used in combination.

[0098] The content of organic solvents in the total amount of water-based ink is, for example, within the range of 30% by weight or more and 60% by weight or less.

[0099] The ink may further contain a penetrant to adjust the drying rate on the sheet 6. Examples of penetrants include glycol ethers. Examples of glycol ethers include ethylene glycol methyl ether, ethylene glycol ethyl ether, ethylene glycol-n-propyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol-n-propyl ether, diethylene glycol-n-butyl ether, diethylene glycol-n-hexyl ether, triethylene glycol methyl ether, triethylene glycol ethyl ether, triethylene glycol-n-propyl ether, triethylene glycol-n-butyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol-n-propyl ether, propylene glycol-n-butyl ether, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol-n-propyl ether, dipropylene glycol-n-butyl ether, tripropylene glycol methyl ether, tripropylene glycol ethyl ether, tripropylene glycol-n-propyl ether, and tripropylene glycol-n-butyl ether. Penetrating agents may be used individually or in combination of two or more types.

[0100] The amount of penetrant in the total amount of water-based ink is preferably in the range of 0% to 20% by weight. More preferably, the amount of penetrant is in the range of 0% to 15% by weight. Particularly preferably, the amount of penetrant is in the range of 1% to 3% by weight.

[0101] The water is preferably deionized water, pure water, or ultrapure water. The water content in the total amount of aqueous ink is preferably in the range of 10% to 90% by weight. More preferably, the water content is in the range of 20% to 80% by weight. The water content may be, for example, the remainder of the other components.

[0102] The ink may further contain conventionally known additives as needed. Examples of additives include surfactants, pH adjusters, viscosity modifiers, surface tension modifiers, and antifungal agents. Examples of viscosity modifiers include polyvinyl alcohol, cellulose, and water-soluble resins. The ink can be prepared by uniformly mixing the ink components using conventionally known methods and removing insoluble materials with a filter or the like.

[0103] Next, a recording method using the recording device 10 will be described. In this recording method, the first transport process, pre-processing process, second transport process, recording process, third transport process, heating process, and winding process are performed simultaneously.

[0104] In the first conveying process, as shown by the arrow in Figure 1, the sheet 6 is first pulled out from the supply roll 11B by the rotation of the supply shaft 11A. The sheet 6 pulled out from the supply roll 11B is then conveyed by the conveying mechanism 40 to below the pre-treatment liquid discharge head 18. At this time, the second conveying roller 14A is negatively charged due to friction with the sheet 6.

[0105] In the pretreatment process, the pretreatment liquid is discharged downward from the pretreatment liquid discharge head 18 toward the sheet 6. As a result, the pretreatment liquid adheres to the upper surface of the sheet 6. At this time, the zeta potential of the resin fine particles in the pretreatment liquid is positive. Therefore, when the pretreatment liquid is discharged from the pretreatment liquid discharge head 18, a mist of positively charged pretreatment liquid is easily generated.

[0106] At the same time, around the pretreatment liquid discharge head 18, an airflow 111 is generated that flows forward due to the sheet 6 being transported forward along the upper straight path 32B. As a result, the mist of the pretreatment liquid is carried by the airflow 111 to the negatively charged second transport roller 14A. Consequently, the mist of the pretreatment liquid is adsorbed onto the second transport roller 14A. The pretreatment liquid adsorbed onto the second transport roller 14A is wiped away by the upper wiper 35 that is in contact with the second transport roller 14A.

[0107] In the second transport process, the sheet 6 to which the pretreatment liquid has adhered is transported below the ink ejection head 22 by the transport mechanism 40. The sheet 6 transported below the ink ejection head 22 is supported on the upper surface of the platen 21. At this time, the fifth transport roller 17A is positively charged due to friction with the sheet 6.

[0108] During the recording process, ink is ejected downwards from the ink ejection head 22 toward the sheet 6. This causes the ink to adhere to the upper surface of the sheet 6. At this time, the zeta potential of the resin particles in the ink is negative. Therefore, the ink ejected from the ink ejection head 22 easily adheres to the positively charged pretreatment liquid on the upper surface of the sheet 6.

[0109] Furthermore, when ink is ejected from the ink ejection head 22, negatively charged ink mist is likely to be generated. At this time, around the ink ejection head 22, an airflow 112 is generated that flows backward due to the sheet 6 being transported backward along the lower straight path 34A. As a result, the ink mist is carried by the airflow 112 to the positively charged fifth transport roller 17A. Consequently, the ink mist is adsorbed onto the fifth transport roller 17A. The ink adsorbed onto the fifth transport roller 17A is wiped away by the lower wiper 36 that is in contact with the fifth transport roller 17A.

[0110] In the third transport process, the ink-covered sheet 6 is transported below the heater 25 by the transport mechanism 40.

[0111] During the heating process, as the sheet 6 passes beneath the heater 25, the sheet 6 and the ink adhering to it are heated by the heater 25. This softens the resin microparticles in the ink and promotes the evaporation of moisture from the ink. As a result, a film made of resin microparticles is formed. Subsequently, the film made of resin microparticles solidifies as it cools naturally. As a result, the ink adheres firmly to the sheet 6.

[0112] In the winding process, the sheet 6 is wound onto the winding roll 12B by the rotation of the winding shaft 12A.

[0113] [Effects of the Embodiment] In the above embodiment, the zeta potential of the resin particles in the ink is negative. Therefore, when ink is ejected from the ink ejection head 22, negatively charged ink mist is likely to be generated. In the above embodiment, the fifth transport roller 17A becomes positively charged due to friction with the sheet 6. Therefore, negatively charged ink mist is attracted to the fifth transport roller 17A. Consequently, it is not necessary to arrange a charging member to positively charge the fifth transport roller 17A, for example. As a result, contamination of the recording device 10 by ink mist is suppressed with a simple structure.

[0114] In the above embodiment, the zeta potential of the resin particles in the pretreatment liquid is positive. Therefore, when the pretreatment liquid is discharged from the pretreatment liquid discharge head 18, a mist of the pretreatment liquid with a positive charge is easily generated. For this reason, the mist of the pretreatment liquid is not adsorbed by the positively charged fifth transport roller 17A. In the above embodiment, the second transport roller 14A becomes negatively charged due to friction with the sheet 6. Therefore, the mist of the pretreatment liquid with a positive charge is adsorbed by the second transport roller 14A. Thus, contamination of the recording device 10 by the mist of the pretreatment liquid is suppressed. Furthermore, the zeta potential of the resin particles in the pretreatment liquid is positive, while the zeta potential of the resin particles in the ink is negative. For this reason, the resin particles in the ink are easily adsorbed by the resin particles in the pretreatment liquid, resulting in high adhesion of the ink to the sheet 6.

[0115] In the above embodiment, the zeta potential of the resin particles in the ink is lower than -2mV, so the ink mist has a strong negative charge. For this reason, the ink mist is strongly adsorbed onto the positively charged fifth transport roller 17A. Also, the zeta potential of the resin particles in the pretreatment liquid is higher than +2mV, so the mist of the pretreatment liquid has a strong positive charge. For this reason, the mist of the pretreatment liquid is strongly adsorbed onto the negatively charged second transport roller 14A.

[0116] In the above embodiment, the material of the sheet 6 is PET resin. The material of the second conveyor roller 14A is fluororesin. Therefore, the second conveyor roller 14A is prone to becoming negatively charged due to friction with the sheet 6. Also, the material of the fifth conveyor roller 17A is iron. Therefore, the fifth conveyor roller 17A is prone to becoming positively charged due to friction with the sheet 6.

[0117] In the above embodiment, the value obtained by subtracting the HSP value of sheet 6 from the HSP value of resin fine particles contained in the pretreatment liquid is 8 MPa. 1 / 2 The following is the reason: Therefore, the adhesion between sheet 6 and the resin fine particles of the pretreatment liquid is high.

[0118] In the above embodiment, the ink ejection head 22 and the fifth transport roller 17A are located above the lower straight path 34A of the transport path 31. Therefore, the fifth transport roller 17A is located closer to the ink ejection head 22 than when it is located below the lower straight path 34A. Consequently, ink mist generated from the ink ejection head 22 is more easily adsorbed onto the fifth transport roller 17A.

[0119] In the above embodiment, the pretreatment liquid discharge head 18 and the second conveyor roller 14A are located above the upper straight path 32B of the conveyor path 31. Therefore, the second conveyor roller 14A is located closer to the pretreatment liquid discharge head 18 compared to when it is located below the upper straight path 32B. Consequently, the mist of the pretreatment liquid generated from the pretreatment liquid discharge head 18 is easily adsorbed by the second conveyor roller 14A.

[0120] In the above embodiment, the sheet 6 is transported backward along the lower straight path 34A of the transport path 31, so an airflow 112 that flows backward is generated around the ink ejection head 22. Therefore, the ink mist generated from the ink ejection head 22 tends to flow backward. In the above embodiment, the fifth transport roller 17A is located behind the ink ejection head 22 in the lower straight path 34A. Therefore, the ink mist tends to adhere to the fifth transport roller 17A.

[0121] In the above embodiment, the sheet 6 is transported forward along the upper straight path 32B of the transport path 31, so that an airflow 111 flows forward around the pretreatment liquid discharge head 18. In the above embodiment, the second transport roller 14A is located in front of the pretreatment liquid discharge head 18 on the upper straight path 32B. For this reason, mist from the pretreatment liquid is easily adsorbed onto the second transport roller 14A.

[0122] In the above embodiment, the recording device 10 is equipped with an upper wiper 35 that contacts the second transport roller 14A. Therefore, mist of the pretreatment liquid adhering to the second transport roller 14A is wiped away by the upper wiper 35. As a result, the pretreatment liquid adhering to the second transport roller 14A is prevented from adhering to the sheet 6.

[0123] In the above embodiment, the recording device 10 is equipped with a lower wiper 36 that contacts the fifth transport roller 17A. As a result, ink adhering to the fifth transport roller 17A is wiped away by the lower wiper 36. Consequently, the adhesion of ink adhering to the fifth transport roller 17A to the sheet 6 is suppressed.

[0124] [Differentiation] In the above embodiment, the fifth transport roller 17A is made of a material that becomes positively charged due to friction with the sheet 6. However, the fifth transport roller 17A may be made of a material that becomes negatively charged due to friction with the sheet 6. In this case, the material of the fifth transport roller 17A is, for example, fluororesin. Also, in this case, the zeta potential of the resin particles of the ink ejected from the ink ejection head 22 is positive. It is preferable that the zeta potential of the resin particles of the ink is higher than +2mV.

[0125] In this configuration, the ink mist generated from the ink ejection head 22 becomes positively charged. As a result, the ink mist is attracted to the fifth transport roller 17A, which becomes negatively charged as it travels along the airflow 112. Therefore, it is not necessary to place a charging member to negatively charge the fifth transport roller 17A, for example. Consequently, contamination of the recording device 10 by ink mist is suppressed with a simple structure.

[0126] In the above embodiment, the second conveyor roller 14A is made of a material that becomes negatively charged due to friction with the sheet 6. However, the second conveyor roller 14A may be made of a positively charged material. In this case, the material of the second conveyor roller 14A is, for example, iron. Also in this case, the zeta potential of the resin particles in the pretreatment liquid discharged from the pretreatment liquid discharge head 18 is negative. It is preferable that the zeta potential of the resin particles in the pretreatment liquid is lower than -2mV.

[0127] In this manner, the mist of the pretreatment liquid generated from the pretreatment liquid discharge head 18 becomes negatively charged. As a result, the mist of the pretreatment liquid is attracted to the second transport roller 14A, which becomes positively charged when carried by the airflow 111. Therefore, contamination of the recording device 10 by the mist of the pretreatment liquid is suppressed.

[0128] In the above embodiment, the material of sheet 6 is PET resin. However, the material of sheet 6 is not particularly limited as long as it is a printable material. For example, the material of sheet 6 is paper. In this case, the fifth conveyor roller 17A is made of a material that is more likely to become positively charged than the paper shown in Figure 2. For example, the material of the fifth conveyor roller 17A is aluminum. The material of the second conveyor roller 14A may be made of a material that is more likely to become negatively charged than the paper shown in Figure 2. This expands the range of materials that can be selected for the second conveyor roller 14A. For example, the material of the second conveyor roller 14A may be iron.

[0129] In the above embodiment, the value obtained by subtracting the HSP value of sheet 6 from the HSP value of resin fine particles contained in the pretreatment liquid is 8 MPa. 1 / 2 The following applies. However, the value obtained by subtracting the HSP value of sheet 6 from the HSP value of the resin fine particles contained in the pretreatment solution is 8 MPa. 1 / 2 It can be even more expensive.

[0130] In the above embodiment, the second conveyor roller 14A is located above the upper straight path 32B. However, the second conveyor roller 14A may be located below the upper straight path 32B. In this case, the second pinch roller 14B is located above the upper straight path 32B.

[0131] In the above embodiment, the fifth conveyor roller 17A is located above the lower straight path 34A. However, the fifth conveyor roller 17A may be located below the lower straight path 34A. In this case, the spur 17B is located above the lower straight path 34A.

[0132] In the above embodiment, the fifth conveyor roller 17A is made of a material that becomes positively charged due to friction with the sheet 6. However, any one of the four conveyor rollers 13A, 14A, 15A, and 16A may be made of a material that becomes positively charged due to friction with the sheet 6. Alternatively, any one of the pinch rollers 13B, 14B, 15B, 16B, and spur 17B may be made of a material that becomes positively charged due to friction with the sheet 6.

[0133] In the above embodiment, the second conveyor roller 14A is made of a material that becomes negatively charged due to friction with the sheet 6. However, any one of the four conveyor rollers 13A, 15A, 16A, and 17A may be made of a material that becomes negatively charged due to friction with the sheet 6. Also, any one of the pinch rollers 13B, 14B, 15B, 16B and the spur 17B may be made of a material that becomes negatively charged due to friction with the sheet 6.

[0134] In the above embodiment, the transport path 31 extends in a U-shape from the supply unit 11 to the winding unit 12. However, the transport path 31 is not limited to a U-shape. For example, the transport path 31 may extend linearly in the front-rear direction from the supply unit 11 to the winding unit 12.

[0135] In the above embodiment, the upper wiper 35 wipes off the pretreatment liquid adhering to the second transport roller 14A. Furthermore, an upper recovery container to receive the pretreatment liquid wiped off by the upper wiper 35 may be placed below the upper wiper 35. This prevents the recording device 10 from being contaminated by the pretreatment liquid wiped off by the upper wiper 35. Note that the upper wiper 35 may be omitted.

[0136] In the above embodiment, the lower wiper 36 wipes away ink adhering to the fifth conveyor roller 17A. Furthermore, a lower recovery container for receiving the ink wiped away by the lower wiper 36 may be placed below the lower wiper 36. Note that the lower wiper 36 may be omitted. [Explanation of symbols]

[0137] 10. Recording device 14A...Second conveyor roller 17A...5th conveyor roller 18. Pre-treatment liquid dispensing head 19. Pre-treatment liquid tank 22... Ink ejection head 23... Ink Tank 31... Conveyor Route 32...First transport route 33... bending road 34...Second transport route 35... Upper wiper (an example of a second wiper) 36...Lower wiper (an example of the first wiper)

Claims

1. An ink tank for storing inkjet ink containing water and resin particles, A first conveying roller that conveys the sheet in the conveying direction, An ink ejection head is located downstream of the first transport roller in the transport direction and ejects the inkjet ink supplied from the ink tank onto the sheet. It is located downstream of the ink ejection head in the above transport direction and includes a second transport roller that transports the sheet in the above transport direction, The zeta potential of the resin microparticles in the above inkjet ink is negative. A recording device in which one of the first and second transport rollers is made of a material that becomes positively charged due to friction with the sheet.

2. A pretreatment liquid tank for storing a pretreatment liquid containing water and resin fine particles, The system further comprises a pre-treatment liquid discharge head located upstream of the ink discharge head in the transport direction, which discharges the pre-treatment liquid supplied from the pre-treatment liquid tank, The zeta potential of the resin fine particles in the above pretreatment solution is positive. The recording device according to claim 1, wherein the other of the first and second conveying rollers is made of a material that becomes negatively charged due to friction with the sheet.

3. The zeta potential of the resin fine particles in the above inkjet ink is lower than -2 mV. The recording device according to claim 2, wherein the zeta potential of the resin fine particles in the pretreatment solution is higher than +2 mV.

4. The material of the above sheet is PET resin. The material of one of the above-mentioned first conveyor roller and the above-mentioned second conveyor roller is iron. The recording device according to claim 2, wherein the material of the other of the first and second conveying rollers is fluororesin.

5. An ink tank for storing inkjet ink containing water and resin particles, A first conveying roller that conveys the sheet in the conveying direction, An ink ejection head is located downstream of the first transport roller in the transport direction and ejects the inkjet ink supplied from the ink tank onto the sheet. It is located downstream of the ink ejection head in the above transport direction and includes a second transport roller that transports the sheet in the above transport direction, The zeta potential of the resin microparticles in the above inkjet ink is positive. A recording device in which one of the first and second transport rollers is made of a material that becomes negatively charged due to friction with the sheet.

6. A pretreatment liquid tank for storing a pretreatment liquid containing water and resin fine particles, The system further comprises a pre-treatment liquid discharge head located upstream of the ink discharge head in the transport direction, which discharges the pre-treatment liquid supplied from the pre-treatment liquid tank, The zeta potential of the resin fine particles in the above pretreatment solution is negative. The recording device according to claim 5, wherein the other of the first and second conveying rollers is made of a material that becomes positively charged due to friction with the sheet.

7. The zeta potential of the resin fine particles in the above inkjet ink is higher than +2 mV. The recording device according to claim 6, wherein the zeta potential of the resin fine particles in the pretreatment solution is lower than -2 mV.

8. The material of the above sheet is PET resin. The material of one of the above-mentioned first conveyor roller and the above-mentioned second conveyor roller is fluororesin. The recording device according to claim 6, wherein the material of the other of the first and second conveying rollers is iron.

9. The value obtained by subtracting the HSP value of the sheet from the HSP value of the resin fine particles contained in the above pretreatment solution is 8 MPa. １／２ The recording device according to claim 2 or 6, which is as follows:

10. The ink ejection head and the pre-treatment liquid ejection head are located above the transport path through which the sheet is transported in the transport direction. The recording device according to claim 2 or 6, wherein the first transport roller and the second transport roller are located above the transport path.

11. The transport path through which the sheet is transported in the above transport direction is: The first transport path extends in a first direction from upstream to downstream in the above transport direction, and the pre-treatment liquid discharge head is located therein. A curved path that bends from the downstream end of the first transport path in a direction opposite to the first direction, It has a second transport path that extends from the downstream end of the above-mentioned curved path in a second direction opposite to the first direction, and in which the ink ejection head is located, One of the first transport roller and the second transport roller is located in the second direction of the ink ejection head in the second transport path. The recording device according to claim 2 or 6, wherein the other of the first transport roller and the second transport roller is located in the first direction of the pre-treatment liquid discharge head in the first transport path.

12. A first wiper that contacts one of the first conveyor roller and the second conveyor roller, The recording device according to claim 2 or 6, further comprising a second wiper that contacts the other of the first conveyor roller and the second conveyor roller.

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