JP2015128876A - Pre-treatment liquid coating dryer, printing system including the same, printing device - Google Patents
Pre-treatment liquid coating dryer, printing system including the same, printing device Download PDFInfo
- Publication number
- JP2015128876A JP2015128876A JP2014001834A JP2014001834A JP2015128876A JP 2015128876 A JP2015128876 A JP 2015128876A JP 2014001834 A JP2014001834 A JP 2014001834A JP 2014001834 A JP2014001834 A JP 2014001834A JP 2015128876 A JP2015128876 A JP 2015128876A
- Authority
- JP
- Japan
- Prior art keywords
- drying
- recording medium
- heating
- pretreatment liquid
- roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007788 liquids Substances 0.000 title claims abstract description 91
- 238000000576 coating method Methods 0.000 title claims abstract description 59
- 239000011248 coating agents Substances 0.000 title claims abstract description 57
- 238000007639 printing Methods 0.000 title claims description 48
- 238000002203 pretreatment Methods 0.000 title abstract description 8
- 238000001035 drying Methods 0.000 claims description 136
- 238000010438 heat treatment Methods 0.000 claims description 99
- 239000000976 inks Substances 0.000 claims description 31
- 230000001629 suppression Effects 0.000 claims description 31
- 238000005452 bending Methods 0.000 claims description 5
- 230000002401 inhibitory effects Effects 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 20
- 238000010586 diagrams Methods 0.000 description 10
- 238000004804 winding Methods 0.000 description 10
- 238000000034 methods Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000011901 water Substances 0.000 description 5
- 239000000463 materials Substances 0.000 description 4
- 239000011347 resins Substances 0.000 description 4
- 229920005989 resins Polymers 0.000 description 4
- 206010018987 Haemorrhages Diseases 0.000 description 3
- 238000010521 absorption reactions Methods 0.000 description 3
- 239000002313 adhesive film Substances 0.000 description 3
- 230000000740 bleeding Effects 0.000 description 3
- 231100000319 bleeding Toxicity 0.000 description 3
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004698 Polyethylene (PE) Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound 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Images
Abstract
Description
The present invention relates to a pretreatment liquid coating and drying apparatus, a printing system having the same, and a printing apparatus.
2. Description of the Related Art Inkjet image recording methods are rapidly spreading due to the advantages of low noise, low running cost, and easy colorization. However, when recording on media other than special paper, in addition to initial quality problems such as bleeding, density, color tone and show-through, there were problems related to image robustness such as water resistance and weather resistance. Various proposals to solve were made.
As one of those solutions, there is a method of improving the image quality by applying a pretreatment liquid having a function of aggregating ink immediately before ink droplets adhere to a recording medium. When the pretreatment liquid is applied, it is necessary to dry the paper before ejecting ink. At this time, when continuous paper is used as the paper, there is a risk that cockling, which is the wavyness of the paper, may occur.
Here, in Patent Document 1, cocking is prevented by spraying water heated by a seasoning device after the paper is dried after the ink is adhered during the printing operation.
However, since the above-mentioned Patent Document 1 has a plurality of processes, the apparatus becomes complicated and becomes large-scale.
In view of the above circumstances, an object of the present invention is to provide a pretreatment liquid coating and drying apparatus that prevents the occurrence of cockling while suppressing the complexity of the apparatus.
In order to solve the above problems, the present invention has the following means.
One idea is that
Conveying means for conveying a continuous recording medium;
A coating apparatus for applying a pretreatment liquid to the recording medium transported by the transport means;
A heating and drying apparatus having heating means for drying the recording medium coated with the pretreatment liquid;
Pre-treatment, comprising: cockling suppression means provided at least one of the downstream and upstream in the transport direction of the recording medium in the vicinity of the drying device, and bending the recording medium a plurality of times with respect to the transport direction. A liquid coating / drying apparatus is provided.
In view of the above circumstances, an object of the present invention is to provide a pretreatment liquid coating and drying apparatus that prevents the occurrence of cockling while suppressing the complexity of the apparatus.
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
<First Embodiment>
(Overall configuration of inkjet printer)
FIG. 1 illustrates a schematic configuration of a printing system 100 according to the first embodiment. As shown in FIG. 1, the printing system 100 includes a paper feeding device 110, a pretreatment liquid coating / drying device 120, a first ink jet printer 130, a reversing device 140, a second ink jet printer 150, a post drying device 160, and a post processing device 170. Have The first inkjet printer 130 and the second inkjet printer 150 are recording apparatuses that perform printing by discharging ink.
In FIG. 1, a continuous recording medium 10 made of, for example, long continuous paper fed from a paper feeding device 110 is first fed to a pretreatment liquid coating / drying device 120. In the pretreatment liquid coating and drying apparatus 120, in order to suppress bleeding and show-through of the ejected ink as a pretreatment prior to image recording by the ink jet method on one side or both sides in the next step, Alternatively, a pretreatment liquid such as an inhibitor is applied to both sides. Furthermore, in the pretreatment coating and drying apparatus, the recording medium 10 is conveyed while the heating and drying apparatus 1 and the cockling suppressing apparatus 50 of the present invention dry the pretreatment liquid of the recording medium 10.
Next, the recording medium 10 on which the pretreatment liquid has been applied and dried is sent to the first inkjet printer 130, and the head unit 131 ejects ink droplets to the front side of the recording medium 10 to form a desired image. The Thereafter, the front and back of the recording medium 10 are reversed by a reversing device 140 having a partial drying function such as a dryer. Subsequently, the recording medium 10 is sent to the second inkjet printer 150, and the head unit 151 ejects ink droplets on the back side of the recording medium 10 to form a desired image.
Then, after printing is performed on both sides of the recording medium 10, post-drying mainly by hot air by a dryer is performed by the post-drying device 160. Thereafter, it is sent to the post-processing device 170 to perform predetermined post-processing and winding.
Each component of the printing system 100 according to the present embodiment is operably connected to a control system (not shown), and signals related to the printing operation are input.
Next, the pretreatment liquid coating and drying apparatus 120 will be described with reference to FIGS. FIG. 2 is a schematic configuration diagram of the pretreatment liquid coating and drying apparatus 120, and shows a state during coating and drying conveyance. FIG. 3 shows a configuration diagram in the vicinity of the feed-in (FI) roller 22 that draws the recording medium 10 from the paper feeding device 110 inside the pretreatment liquid coating and drying device 120. FIG. 4 shows a configuration diagram in the vicinity of the pass shaft 25 in which the recording medium 10 that has passed through the air loop AL in the pretreatment liquid coating and drying apparatus 120 is transported with the position corrected. FIG. 5 is a view for explaining the recording medium conveyance by the infeed roller portion inside the pretreatment liquid coating apparatus of FIG. 3 to 5 and the like, tension is applied to the recording medium 10 that is continuous paper in the pretreatment liquid coating and drying apparatus 120.
The pretreatment liquid coating / drying device 120 shown in FIG. 2 has a pretreatment liquid coating apparatus 30 that coats the pretreatment liquid onto the recording medium 10. In order to dry the pretreatment liquid of the recording medium 10, the heat drying unit (heat drying apparatus) 1 is provided downstream of the pretreatment liquid coating apparatus 30 in the recording medium conveyance direction. Further, the pretreatment liquid coating / drying apparatus 120 includes an air loop unit 20, a pretreatment liquid supply unit 40, and a dancer apparatus 80 in addition to the pretreatment liquid coating apparatus 30 and the heat drying apparatus 1 described above.
In FIG. 2, a roller (not shown) is provided at the end of the roller, and a large number of rotatable guide rollers 21 and 24 and the like are installed in the pretreatment liquid coating / drying device 120 to convey the recording medium 10. A path 70 is formed.
Reference numeral 22 denotes an FI roller which is rotationally driven by a drive source (not shown) such as a motor. The FI roller 22 is pressed against the FI nip roller 23 by the tensile force of a spring 27 as shown in FIG. Is given.
The recording medium 10 is elastically sandwiched between the FI roller 22 and the FI nip roller 23, and the FI roller 22 is rotated by the drive source so that the recording medium 10 is moved upstream of the pretreatment liquid application units 33 and 34. The recording medium 10 can be pulled in from the provided paper feeding device 110.
The recording medium 10 fed from the FI roller 22 and the FI nip roller 23 is slightly slackened to form an air loop AL. The amount of slack in the air loop AL is monitored by an optical sensor (not shown), and the amount of slack is measured. The FI roller 22 is driven and controlled so that is constant.
As shown in FIG. 4, two recording media 10 that have passed through the air loop AL pass between the pass shaft 25 and the edge guide 26 and are arranged in a direction orthogonal to the conveyance direction (arrow direction) of the recording medium 10. The pass shaft 25 is passed in an S shape. A pair of edge guides 26 are supported on the pass shaft 25, and the distance between the edge guides 26 is supported in the same dimension as the width direction of the recording medium 10.
For this reason, the travel position of the recording medium 10 in the width direction is regulated by the action of the pass shaft 25 and the edge guide 26, and stable travel is possible. The edge guide 26 is fixed to the pass shaft 25 by fixing means such as screws, and the position of the edge guide 26 can be adjusted according to the width dimension of the recording medium 10 to be used. The recording medium 10 that has passed between the pass shaft 25 and the edge guide 26 is applied with tension for running stability by a tension shaft (not shown) in a fixed state.
The recording medium 10 that has passed through the tension shaft enters the pretreatment liquid coating apparatus 30 and passes between an infeed roller 31 and a feed nip roller 32 that are rotationally driven by a drive source (not shown) such as a motor. As shown in FIG. 5, a plurality of feed nip rollers 32 are arranged along the axial direction of the infeed roller 31, and each feed nip roller 32 is pressed against the infeed roller 32 side by a spring 37.
The recording medium 10 that has passed between the in-feed roller 31 and the feed nip roller 32 sequentially passes through a back coating unit 33 that applies the pretreatment liquid to the back side and a surface coating unit 34 that applies the pretreatment liquid to the front side. By doing so, a pretreatment liquid is apply | coated to both surfaces.
The recording medium 10 that has passed through the surface coating device 34 is moved between an outfeed roller 35 and a feed nip roller 36 that are rotationally driven by a driving source (not shown) such as a motor similar to the rollers 31 and 32 shown in FIG. Pass through. Thereafter, the recording medium 10 passes through the heating and drying apparatus 1 and then passes through the bent conveyance path 52 along the driven roller 51 of the cockling suppressing device 50 that suppresses cockling particularly during standby.
5 passes between a feed roller 61 and a feed nip roller 60 that are rotationally driven by a driving source such as a motor, similarly to the rollers 31 and 32 shown in FIG. Thereafter, the recording medium 10 is wound in a W shape over the rotatable dancer rollers 85 and 86 and the guide roller 81 disposed between the dancer rollers 85 and 86.
The dancer rollers 85 and 86 are rotatably attached to the movable frame 84 via bearings (not shown) provided at the roller ends to constitute a dancer unit 87. A weight 83 is attached to the movable frame 84. The dancer unit 87 is movable along the gravitational direction A, and dancer unit position detection means (not shown) for detecting the position of the dancer unit 87 is provided, according to the output of the position detection means. The drive source of the feed roller 61 is driven and controlled. With this configuration, the position of the dancer unit 87 can be adjusted, and the buffer amount of the recording medium 10 between the apparatuses is secured.
After the recording medium 10 passes through the discharge roller 82, it is conveyed to the first inkjet printer 130 at the subsequent stage.
With such a configuration, in the pretreatment liquid coating / drying apparatus 120, the pretreatment liquid coating apparatus 30 coats the recording medium 10 with a pretreatment liquid for improving image quality, such as prevention of ink bleeding and permeation assistance. Thereafter, the pretreatment liquid is evaporated in the heating and drying apparatus 1, cooled by a dancer apparatus 80 that conveys the recording medium 10 in a step with a difference in height, and then conveyed to the first inkjet printer 130 in the subsequent stage.
In FIG. 2, feed rollers 31, 35, 61 and the like function as a transport unit of the pretreatment coating / drying apparatus 120.
FIG. 6 is a schematic configuration diagram of the heating and drying device 1 and the cockling suppressing device (means) 50 of the present invention. The heat drying apparatus 1 dries the recording medium 10 coated with the pretreatment liquid. The heat drying apparatus 1 includes an upper surface drying unit 1A and a lower back surface drying unit 1B.
The upper surface drying unit 1A includes surface drying heating rollers 4b, 5b, and 6b that dry the surface 11 of the recording medium 10, and a plurality of surface steam discharge fans 8 that discharge steam and the like. Similarly to the upper surface drying unit 1A, the back surface drying unit 1B has a plurality of back surface drying heating rollers 4a, 5a, 6a that dry the back surface 12 of the recording medium 10, and a plurality of back surface steam discharges that discharge steam and the like. It has a fan 9.
The heating rollers 4a to 6b are driven to simplify the apparatus and control, and include a heater for heating (a heater lamp (not shown) and a heat pipe (not shown) for temperature equalization). The surface of each heating roller 4a to 6b is coated with a non-adhesive film such as a fluororesin, etc. This coating suppresses the adhesion of ink etc. to the roller surface, and is caused by the deposit on the roller surface. A decrease in the efficiency of heat conduction to the recording medium 10 can be suppressed.
In the heating and drying apparatus 1, the recording medium 10 coated with the pretreatment liquid is basically dried only on the coated surface (both front and back surfaces or either surface). That is, since only the surface 11 side is dried at the time of coating on the surface side, the surface drying heating rollers 4b, 5b, 6b are heated and the recording medium 10 is dried. Since only the back surface 12 side is dried at the back surface side application, the back surface drying heating rollers 4a, 5a, 6a are heated to dry the recording medium 10. In addition, since both sides are dried at the time of application on both sides, the surface drying heating rollers 4b, 5b and 6b and the back drying heating rollers 4a, 5a and 6a are heated to dry the recording medium 10.
On the downstream side in the vicinity of the outlet of the heating and drying apparatus 1, a bent conveyance path 52 that is bent with respect to the conveyance direction by forming a plurality of driven rollers 51 in the conveyance direction is formed as a cockling suppression device 50. .
As is apparent from FIG. 6, the outer diameter of the driven roller 51 is smaller than the outer diameter of the heating rollers 4a to 6b, that is, the roller diameter is increased. This is because winding (thermoplastic deformation) is generated in the recording medium 10 by the heating rollers 4a to 6b during the standby state where printing is stopped, and the large deformation of the winding occurs during the subsequent printing. The head may be clogged or the head may be damaged.
In this embodiment, the curvature of the outer diameter of the driven roller 51 is larger than the curvature of the outer diameter of the heating rollers 4a to 6b, that is, the outer diameter of the driven roller 51 is smaller than the outer diameter of the heating rollers 4a to 6b. Therefore, the recording medium 10 is conveyed while being wound around the plurality of driven rollers 51 having a large curvature, so that a difference in curvature between the winding roll caused by the heating rollers 4a to 6b and the plurality of driven rollers 51 having a small outer diameter is caused. There is an effect that the recording medium 10 is squeezed to correct the curl deformation.
This winding habit tends to increase as the thickness of the recording medium 10 increases. The outer diameter of the driven roller 51 is appropriately selected by the main recording medium 10 within a range smaller than the outer diameter of the heating rollers 4a to 6b. Also good. The cockling suppressing device 50 will be described in detail later.
FIG. 7 shows the drying unit 1 opened up and down, and when the recording medium 10 is loaded, it is only necessary to pass the recording medium 10 in the opened state.
As shown in FIG. 8, the surface drying unit 1A and the back surface drying unit 1B are fixed to the belts 16 stretched by the pulleys 15 via the arms 13 and 14, and the heating and drying apparatus 1 is opened and closed. This is done by rotating the pulley 15. In each heating roller 4a to 6b, the thermistor 2 is fixed to the frame of the drying units 1A and 1B by the holder 3 for temperature control.
In the heating / drying apparatus 1, the control device 90 of the pretreatment liquid application / drying apparatus 120 executes the heating control process, and based on the detection result of the thermistor 2, the heating rollers 4 a to 6 b are installed in the heating roller 4 a to 6 b. The heating amount (temperature) of each heater (heater lamp etc.) shown in the figure is controlled.
Here, the set temperature of the front surface drying first stage heating roller 4b and the back surface drying first stage heating roller 4a is equal to or lower than the set temperature of each of the subsequent heating rollers 5a, 5b, 6a, 6b. It is set. This is because the first stage heating rollers 4a and 4b are the first heating rollers into which the recording medium 10 enters, and if the first stage is set to a high temperature, the temperature cannot be increased to the set temperature even during printing. Furthermore, if the temperature does not rise to the set temperature, the heater lamp may remain turned on even after the conveyance is stopped, and the temperature of the heating rollers 4a and 4b rises transiently even after the conveyance is stopped, and the recording medium. This is because there is a case where a large deformation is caused with respect to 10.
Returning to FIG. 6, a cockling suppressing device 50 is disposed on the downstream side in the vicinity of the outlet of the heating and drying device 1. In the cockling suppressing device 50, the hollow driven rollers 51 are arranged in the transport direction, whereby a bent transport path 52 that is bent a plurality of times with respect to the transport direction is formed. More specifically, in FIG. 6, the bent conveyance path 52 is formed so that the cockling suppression device 50 on the downstream side undulates vertically (in a direction perpendicular to the conveyance direction) extending in the horizontal direction.
It is preferable that the bent conveyance path 52 by the plurality of hollow driven rollers 51 has a shorter distance between the axes of the adjacent driven rollers as it is closer to the heating and drying device 1 (D3> D2> D1). For example, with the driven roller 51 on the outlet side of the heating and drying apparatus 1 as a starting point, the inter-axial position of the downstream driven roller 51 is 50, 75, 100, and thereafter 100 mm.
The driven roller 51 (right side in FIG. 6) closer to the heating and drying apparatus 1 has a shorter distance between the shafts because the winding angle of the recording medium 10 becomes larger with a roller having the same outer diameter when the distance between the shafts is shorter. Because. When the winding angle of the recording medium is large, the recording medium 10 and the driven roller 51 are in pressure contact with each other, so that the pressure contact area is widened and free expansion and contraction of the recording medium 10 is suppressed. Furthermore, nonuniformity in temperature and humidity changes in the paper width direction of the recording medium 10 due to contact is prevented, and the rigidity of the recording medium 10 in the paper width direction due to a large winding angle is increased.
Further, in the cockling device 50 described above, the driven roller 51 bends the recording medium 10 a plurality of times, so that the recording medium is compared with the case where the bending is caused by the positional relationship between the heating device and the subsequent device. 10, while the wavy deformation (cockling) at 10 is not grown, the deformation is divided by each driven roller 51, and free deformation, particularly in the width direction of the recording medium 10, is suppressed at the pressed portion. Thus, cockling can be prevented in a stepwise manner over a wide range in the conveying direction, and even large cockling can be suppressed.
Therefore, in the recording medium 10, cockling that is a wavy deformation parallel to the conveyance direction and perpendicular to the width (paper width) direction of the recording medium 10 that occurs during standby is less likely to occur.
In the present embodiment shown in FIG. 6, the recording medium 10 that has been drastically dried by the heating and drying apparatus 1 begins to absorb moisture immediately after the outlet of the heating and drying apparatus 1, and the cockling phenomenon tends to occur remarkably. In particular, a bent conveyance path 52 is provided on the outlet side of the heating and drying apparatus 1.
Further, although the degree of deformation is smaller on the inlet side of the heating / drying apparatus 1 than on the outlet side, cockling may occur due to a drastic change in temperature and humidity with the heating / drying apparatus 1. A bent conveyance path similar to the bent conveyance path 52 may be provided. When the cockling suppressing device is provided on the inlet side, the bent conveyance path is formed so as to wave in a direction orthogonal to the inclined conveyance direction. Alternatively, the cockling suppression device 50 may be provided on either the downstream side or the upstream side in the conveyance direction of the recording medium 10 in the vicinity of the drying device 1.
(Configuration example 1 of driven roller)
Here, FIG. 9 shows a sectional view of a first configuration example of the hollow driven roller 51 constituting the cockling control device.
This configuration is a relatively simple configuration, and the driven roller 51 is configured such that a bearing 54 is fitted into a shaft 58 and a hollow roller 59, is prevented from coming off by an E-ring 57, and is fixed to a frame 53 by a washer 56 and a bolt 55. To do. The inner diameter of the hollow roller 59 is larger than the outer diameter of the shaft 58, and the space between the inner surface of the hollow roller 59 and the outer side of the shaft 58 is hollow.
The hollow roller 59 may be made of stainless steel that is resistant to corrosion or aluminum that has a relatively high heat transfer rate, and in order to improve the peelability, the pretreatment liquid and ink on the roller surface are similarly applied to the heating rollers 4a to 6b. A non-adhesive film such as a fluororesin for suppressing adhesion may be applied, but is not limited thereto.
(Configuration example 2 of driven roller)
FIG. 10 shows a sectional view of a second configuration example of the driven roller 51 constituting the cockling control device.
The driven roller 51 has a hollow hollow roller main body 51A-1 and an end 51B-1 that closes the hollow roller main body 51A-1. The end portion 51B-1 is fixed by fastening a bearing 54-1 whose axial direction is defined by the sleeve 43 and the E-ring 57 to be secured to the frame 53 by the bearing retainer 42 and the bolt 55. Yes.
The surface layer A2 of the hollow roller body 51A-1 is covered with a non-adhesive film such as a fluororesin for suppressing adhesion of pretreatment liquid and ink to the roller surface, similarly to the heating rollers 4a to 6b. The inner layer A1 is made of a metal having good thermal conductivity such as aluminum. The hollow roller main body 51A-1 receives heat from the recording medium 10 by passing the heated recording medium 10 while winding.
At this time, in order to avoid the influence of the temperature, a sheet passing portion is provided in the hollow roller body 51A-1 while avoiding a portion where the end portion 51B-1 having different thermal conductivity exists. With this configuration, uniform heat transfer from the recording medium 10 to the hollow roller body 51A-1 in the width direction of the recording medium 10 becomes possible.
The end 51B-1 for connecting to the frame 53 via the bearing 54-1 is, for example, PI (polyimide), PPS (polyphenylene sulfide), PAI (polyamide-imide), PEI (polyetherimide), or LCP. (Liquid crystal polymer), PEEK (polyether-ether-ketone) resin, or a resin material such as a ceramic material is preferable. Since the end portion 51B-1 made of resin has a lower thermal conductivity than the hollow roller body 51A-1 made of metal, a heat insulating effect is produced at the end portion 51B-1 made of resin.
Therefore, the amount of heat received by the hollow roller body 51A-1 can be reduced as much as possible to the end 51B-1, and cooling by the heat transfer by the driven roller 51 is limited to the capacity of the hollow roller body 51A-1. Therefore, in this configuration, the heat retention effect of the drying heat is large.
(Configuration example 3 of driven roller)
Here, FIG. 11 shows a cross-sectional view of a second configuration example of the driven roller 51 constituting the cockling control device. The driven roller 51 has a hollow hollow roller main body 51A-2 and an end 51B-2 having a ventilation path through which air passes. The end portion 51B-2 has an air hole so that the outside can be ventilated. A bearing 54-2 whose axial direction is defined by the sleeve 43 and the E-ring 57 is prevented from being removed by the bearing retainer 42 and the bolt 55. The frame 53 is fixed by being fastened.
The hollow roller body 51A-2 has the same structure as that of the configuration example 1. The end 51B-2 may be the same material as the hollow roller body 51A-2 or a different material, but a material having good thermal conductivity is preferable. The end 51B-2 takes air into the hollow roller body 51A-2 from the air hole through the ventilation path.
Therefore, the amount of heat received by the hollow roller main body 51A-2 from the recording medium 10 is released to the outside through the end 51B-2, and the outside air is taken in, so that the capacity of the hollow roller main body 51A-2 can be obtained by using air circulation. The above amount of heat can be received from the recording medium 10 and cooled. Therefore, this configuration has a large cooling effect.
Also in this configuration, in order to avoid the influence of temperature, in the hollow roller main body 51A-2, a paper passing portion is provided to avoid a portion where the end portion 51B-2 is present and the thermal conductivity is different. With this configuration, uniform heat transfer from the recording medium 10 to the hollow roller body 51A-2 in the width direction of the recording medium 10 becomes possible.
An electromagnetic valve 44, piping 45, and the like are arranged at the end of this configuration and controlled by the controller 46. In the printing of the thick recording medium 10, the electromagnetic valve 44 is opened and air or cold air is sent during printing. It is also possible to cool the recording medium 10 and prevent a temperature rise of the head unit 131 in the printer 130 at the rear. The electromagnetic valve 44 may be closed before or after printing is stopped, when printing is stopped, or when printing is waited to reduce the temperature change and assist cockling suppression.
Note that, since the configuration example 1, the configuration example 2, and the configuration example 3 have different characteristics, the configuration may be appropriately selected according to the application, and may be appropriately combined. As the structure of the driven roller 51, the temperature adjustment function is high in the order of Configuration Example 3> Configuration Example 2> Configuration Example 1 due to the exchange of the hollow ratio and the outside air.
When the configuration example 3 is used, for example, warmth is given priority on the upstream side, and warm air is taken in and heated so that the temperature is between the temperature of the first-stage heating rollers 4a and 4b and room temperature. In order to take in high-temperature air for heating, a heat source may be disposed near the temperature hollow roller 51A-2, or heat from the heating and drying apparatus 1 may be drawn. On the other hand, on the downstream side, air or cold air is taken in and cooled in order to reduce the difference from the outside temperature during printing.
(Control example of pretreatment liquid coating and drying equipment)
FIG. 12 is a control flowchart of the pretreatment liquid coating / drying apparatus 120. The operation timing corresponds to a drying operation timing, a coating operation timing, a transport operation timing, and a printing operation timing shown in a timing chart described later.
When printing is started, the pretreatment liquid coating and drying apparatus 120 receives a print start (PS) signal from the control system as a print preparation in step (hereinafter simply referred to as S) S101. Then, the temperature rise of the heating and drying apparatus 1 is started, the heater lamps built in the heating rollers 4a to 6b are turned on, and the heating rollers 4a to 6b are heated (S102). When the heating rollers 4a to 6b are raised to the desired drying set temperature and the raising is completed (S103), the entire recording medium 10 is conveyed and the pretreatment liquid application units 33 and 34 start to apply the pretreatment liquid. (S104).
When the recording medium 10 on which the pretreatment liquid has been applied and dried reaches the head portion 131 of the first ink jet printer 130 (S105), ink is landed from the head portion 131 and printing starts (S106). More specifically, when the recording medium 10 on which the pretreatment liquid has been applied and dried reaches the first first ink jet printer 130, surface printing such as an ink jet image is performed. When the recording medium 10 reaches the second ink jet printer 150 continuously, back side printing such as an ink jet image is performed. In this way, the printing operation is continued for a predetermined period.
When printing is stopped, a printing stop (PE) signal is output from the control system, and the pretreatment liquid coating / drying apparatus 120 receives the PE signal and starts to end printing (S107). In this operation, first, the application of the pretreatment liquid in the pretreatment liquid coating apparatus 30 (33, 34) is terminated (S108). Thereafter, the heater lamp is turned off to stop the heating in the heating / drying apparatus 1 and heating of the heating rollers 4a to 6b is stopped (S109). After the end of application comes out of the outlet of the heating / drying apparatus 1 (S110), recording is performed. The conveyance of the medium 10 is stopped (S111).
By performing such control, the recording medium 10 not coated with the pretreatment liquid remains in the heat drying apparatus 1 and the heating rollers 4a to 6b are not heated, so that the deformation of the recording medium 10 is small. It becomes a state. Therefore, the recording medium 10 is less deformed in the heating / drying apparatus 1, and there is a head clogging or head damage due to the deformation of the recording medium 10 in the head units 131, 151 of the recording apparatuses 130, 150 to be subsequent processing. This has the effect of preventing deterioration in image quality.
If there is a next JOB (S112), the process returns to the start of print preparation again, but if not, the process ends.
It should be noted that the time when the recording medium 10 on which the pretreatment liquid has been applied and dried reaches the head portions 131 and 151 of the recording devices 130 and 150, and the application units 33 and 34 have completed the application, and the application termination exits the heating and drying apparatus 1 outlet. Is calculated by counting the time from the transport distance and the transport speed and counting the time.
Further, when the temperature of the heating and drying apparatus 1 is raised, the recording medium 10 in the heating and drying apparatus 1 is usually the recording medium 10 to which the pretreatment liquid is not applied. Relatively small. For this reason, in the recording medium 10, the area and the area where the pretreatment liquid before the conveyance stop is not applied are treated as waste paper as the non-printable area.
Although the case of double-sided printing has been described here, single-sided printing of only the front surface or the back surface is also possible. In this case, the pretreatment liquid is applied and dried on the side to be printed, and the moisture content of the recording medium 10 delivered from the pretreatment liquid application / drying device 120 is the same as when the paper supply device 110 delivers. The water content of the recording medium 10 is made almost equal. This is because when considering a wide variety of recording media, it is sufficient to bring the water content of the ink jet dedicated paper close to the original water content.
FIG. 13 is a timing chart showing the timing of heating and drying and pretreatment liquid application with respect to the conveyance timing of the recording medium 10.
As shown in FIG. 13, the drying timing is such that after the heating rollers 4a to 6b are raised to the drying set temperature, the pretreatment liquid application is turned on and the recording medium 10 is transported to turn on and dry the application. Inkjet printing described later is performed. Then, after stopping the application of the pretreatment liquid before stopping the entire printing conveyance, the heating of the heating rollers 4a to 6b is turned off to stop the drying, and then the conveyance of the recording medium 10 is stopped.
Here, the heating rollers 4a to 6b may be completely turned off as drying OFF, but the standby temperature may be set to about 40 ° C. to 45 ° C. in order to shorten the temperature rise time in the next printing. This is because if the standby temperature is about 40 ° C. to 45 ° C., the deformation of the recording medium 10 at this temperature is extremely small considering that the recording medium is not coated with the pretreatment liquid.
By controlling in this way, the recording medium 10 to which the pretreatment liquid is not applied remains in the heat drying apparatus 1 and the heating rollers 4a to 6b are not heated, so that the deformation of the sheet is reduced. Therefore, there is no influence on the head part 131 due to the sheet deformation in the ink jet head part 131 thereafter, that is, no damage to the ink jet printers 130 and 150 such as head damage, and there is no deterioration in image quality, and there is an advantageous effect.
However, during the subsequent printing standby, even if the recording medium 10 is not applied, the recording medium 10 stopped at the outlet side of the heating / drying apparatus 1 is caused by the remaining heat of the heating rollers 4a to 6b of the heating / drying apparatus 1. Stopped in a sufficiently dry state. For this reason, the recording medium 10 tends to expand and contract with rapid moisture absorption, but as described above, cockling is suppressed by the formation of the bent conveyance path.
As described above, according to the present invention, even without using expensive inkjet dedicated paper, the pre-treatment liquid coating and drying process is performed, and even during standby, the wave shape deformation due to moisture absorption of the recording medium 10 on the drying unit outlet side, the cock The number of rings can be extremely small. Therefore, the pretreatment liquid coating and drying device is free from rubbing on the recording medium in the head portions 131 and 151 in the subsequent process by cockling, and is free from print stains, head stains, print dot missing due to head clogging, head damage, and the like. A recording device can be provided, and a good printing operation can be performed.
Second Embodiment
Here, FIG. 14 shows a printing apparatus according to a second embodiment having a heat drying function and a cockling suppressing function.
The recording medium heating and drying apparatus 200 according to this embodiment is an ink drying apparatus, and a printing apparatus 1000 including the apparatus will be described. FIG. 14 shows a schematic configuration diagram of the entire printing apparatus 1000 having the heating and drying apparatus 200. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and different points from the first embodiment will be mainly described.
As shown in FIG. 14, in the printing apparatus 1000 according to the present embodiment, a recording apparatus 400, a paper feeding apparatus 300, and a conveyance unit 500 are arranged upstream of the heating and drying apparatus 200, and downstream of the heating apparatus 200 that is an ink drying apparatus. The post-processing device 600 is arranged. As the post-processing device 600, a winding device that winds the recording medium 10 after printing or a folding machine that can be folded can be installed.
The recording apparatus 400 includes a head unit 401 serving as an image forming unit. The head unit 401A forms an image on the recording medium 10 by ejecting and attaching a liquid such as ink to the recording medium 10.
As in the first embodiment, the heating and drying apparatus (heating and drying unit) 200 includes heating rollers 4a, 4b, 5a, 5b, 6a, and 6b and exhaust ducts 8, 9, and 6b from upstream in the conveyance direction T of the recording medium 10. And a discharge roller 7.
Further, in the heating and drying apparatus 200, a heating control process is executed by the control apparatus 900, and the heating amount (temperature) of each heater (not shown) of each heating roller 4a to 6b is controlled.
Also in this embodiment, similarly to FIG. 6, a bent conveyance path 52 that is bent a plurality of times with respect to the conveyance direction by a plurality of driven rollers 51 is formed on the downstream side in the vicinity of the outlet of the heat drying apparatus 1, The wavy cockling in the paper width direction that occurs inside is suppressed.
Since the flow and the like are the same, description thereof is omitted.
Even in the present embodiment, the pretreatment liquid coating and drying process is performed without using expensive inkjet dedicated paper, and the wave shape deformation and cockling due to moisture absorption of the recording medium 10 on the exit side of the drying unit are extremely difficult even during standby. Less. Therefore, there is no rubbing with the recording medium in the post-processing apparatus 600 in the post-process by cockling, and the recording medium 10 can be wound up with good printing work.
1 Heating and drying equipment (drying equipment)
4a, 4b, 5a, 5b, 6a, 6b Heating roller (heating means)
42 Bearing presser 43 E ring 44 Solenoid valve 45 Piping 46 Controller 35 Conveying section 50 Cock ring suppression device (cock ring suppression means)
51 Follower Rollers 51A-1, 51A-2 Hollow Roller Main Body 51B-1, 51B-2 End 52 Bent Conveying Path 53 Frames 54, 54-1, 54-2 Bearing 58 Shaft 59 Hollow Roller 100 Printing System 120 Pretreatment Liquid Coating and drying device 130 First ink jet printer (recording device)
150 Second inkjet printer (recording apparatus)
1000 Printing apparatus 200 Heating and drying apparatus 400 Recording apparatus
Claims (7)
- Conveying means for conveying a continuous recording medium;
A coating apparatus for applying a pretreatment liquid to the recording medium transported by the transport means;
A heating and drying device comprising heating means for drying the recording medium coated with the pretreatment liquid;
Cockling suppression means provided at least one of the downstream and upstream in the transport direction of the recording medium in the vicinity of the drying device, and bending the recording medium a plurality of times with respect to the transport direction;
A pretreatment liquid coating and drying apparatus. - The cockling suppressing means has a plurality of driven rollers,
The pretreatment liquid coating and drying apparatus according to claim 1, wherein the plurality of driven rollers are arranged in the transport direction to form a bent transport path that bends the recording medium in the transport direction. - The heating means of the heating and drying apparatus is a heating roller;
The pretreatment liquid application / drying device according to claim 2, wherein a curvature of the plurality of driven rollers forming the bending conveyance path is larger than a curvature of the heating roller. - 4. The pretreatment liquid coating and drying apparatus according to claim 2, wherein in the bent conveyance path, the closer to the heating and drying apparatus, the shorter the distance between the adjacent driven rollers. 5.
- The pretreatment liquid coating and drying apparatus according to any one of claims 2 to 4, wherein the driven roller is a hollow roller.
- The pretreatment liquid coating and drying apparatus according to any one of claims 1 to 5,
A recording apparatus disposed downstream of the pretreatment liquid coating apparatus in the transport direction and ejecting and adhering ink to the recording medium after the pretreatment liquid is applied and dried by the pretreatment liquid coating and drying apparatus; , Printing system. - Conveying means for conveying the recording medium;
A recording apparatus for ejecting and adhering ink to the recording medium;
A heating and drying apparatus having heating means for drying the recording medium to which the ink is attached;
A printing apparatus, comprising: cockling suppression means that is provided in at least one of the downstream and upstream of the recording medium in the vicinity of the drying apparatus and bends the recording medium a plurality of times with respect to the conveyance direction.
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| JP2014001834A JP6421414B2 (en) | 2014-01-08 | 2014-01-08 | Pretreatment liquid coating and drying apparatus, printing system having the same, and printing apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2014001834A JP6421414B2 (en) | 2014-01-08 | 2014-01-08 | Pretreatment liquid coating and drying apparatus, printing system having the same, and printing apparatus |
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| JP2015128876A true JP2015128876A (en) | 2015-07-16 |
| JP6421414B2 JP6421414B2 (en) | 2018-11-14 |
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| US9475313B2 (en) | 2014-12-12 | 2016-10-25 | Ricoh Company, Ltd. | Pretreatment liquid application drying device, printing system including the same, and printing device |
| CN108963191A (en) * | 2018-07-20 | 2018-12-07 | 横店集团东磁股份有限公司 | A kind of preparation method of pole piece |
| US10479110B2 (en) | 2016-01-15 | 2019-11-19 | Hewlett-Packard Development Company, L.P. | Partially dried inkjet media fusers |
| KR102090821B1 (en) * | 2019-12-23 | 2020-03-18 | 주식회사 알유피 | Printign system |
| US10851253B2 (en) | 2018-03-16 | 2020-12-01 | Ricoh Company, Ltd. | Image forming method and image forming apparatus |
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| US9475313B2 (en) | 2014-12-12 | 2016-10-25 | Ricoh Company, Ltd. | Pretreatment liquid application drying device, printing system including the same, and printing device |
| US10479110B2 (en) | 2016-01-15 | 2019-11-19 | Hewlett-Packard Development Company, L.P. | Partially dried inkjet media fusers |
| US10851253B2 (en) | 2018-03-16 | 2020-12-01 | Ricoh Company, Ltd. | Image forming method and image forming apparatus |
| CN108963191A (en) * | 2018-07-20 | 2018-12-07 | 横店集团东磁股份有限公司 | A kind of preparation method of pole piece |
| KR102090821B1 (en) * | 2019-12-23 | 2020-03-18 | 주식회사 알유피 | Printign system |
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| JP6421414B2 (en) | 2018-11-14 |
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