Recording system and recording method

Abstract

To provide a recording system and a recording method which can suppress conveying defect of an object to be recorded, when performing printing by an inkjet recording method using aqueous ink and when performing both side printing in particular.SOLUTION: A recording system, which performs printing by an inkjet recording method, comprises: a pre-processing part that pre-processes an object to be recorded; a detecting part that detects a value of a factor relating to deformability of the object to be recorded; a control part that controls the pre-processing part; and a recording part that performs printing on the pre-processed object to be recorded, by the inkjet recording method. The pre-processing part has a dry processing part that dry-processes the object to be recorded, and a pre-coating part that pre-coats the object to be recorded using precoat liquid. The control part controls intensity in the dry processing and in the pre-coating, in accordance with a detected result by the detecting part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a recording system and a recording method, and more particularly to a recording system and a recording method that suppress problems with the transport of a recorded material during printing by an inkjet recording method using aqueous inkjet ink, particularly during double-sided printing. [Background technology]

[0002] In forming an image by an inkjet recording method using aqueous inkjet ink (hereinafter also simply referred to as "aqueous ink"), droplets of the aqueous ink are ejected from an inkjet head (hereinafter also simply referred to as "head") toward a recording medium, and after landing on the recording medium, the aqueous solvent containing water is dried from the resulting ink layer to form a printed layer (image).

[0003] Here, in printing devices, not limited to inkjet recording devices, it is known that if the recorded material is deformed, such as curled, this can cause problems in transporting the recorded material, such as paper jams.

[0004] In a printing device using the above-mentioned inkjet recording method with the aqueous ink, particularly when double-sided printing is performed, if the main surface of the recorded material that is printed first is the front surface and the main surface that is printed next is the back surface, curling occurs in the recorded material after front surface printing, and problems with the transport of the recorded material are likely to occur when printing on the back surface.

[0005] On the other hand, a technique is known in which a pretreatment is performed before recording with an aqueous ink to improve the wettability of the printing surface of a recording medium, thereby increasing the dot diameter of aqueous ink droplets and improving pinning properties, thereby improving the quality of the printed image. For example, Patent Document 1 describes a printing device using an inkjet recording method that has a pre-coating treatment unit and a plasma treatment unit as pre-treatment means and is equipped with a control unit that controls the amount of plasma energy and the amount of application of a pre-coating treatment liquid according to the type of printing medium.

[0006] The technology described in Patent Document 1 improves the permeability of the water-based ink on the printing surface by changing the amount of pretreatment depending on the type of printing medium, thereby improving the quality of the printed image. However, Patent Document 1 does not describe a technology for changing the pretreatment conditions in response to the deformation state of the printing medium to eliminate problems with the transportation of the recorded material. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2016-163998 A Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in consideration of the above problems and circumstances, and the problem to be solved by the present invention is to provide a recording system and a recording method that suppress problems in the transport of the recorded material when printing by an inkjet recording method using aqueous ink, particularly when double-sided printing is performed. [Means for solving the problem]

[0009] In the course of investigating the causes of the above problems in order to solve the above problems, the present inventors discovered that by detecting the value of a factor related to the deformability of a recorded material and performing pretreatment on the recorded material in accordance with the detected value of the factor, problems with the transport of the recorded material during printing by an inkjet recording method using aqueous inkjet ink, particularly during double-sided printing, can be suppressed, and thus arrived at the present invention. That is, the above problems according to the present invention are solved by the following means.

[0010] 1. A recording system using an inkjet recording method, a pre-processing section for pre-processing a recording medium; A detection unit for detecting a value of a factor related to the deformability of the recording medium; A control unit that controls the pre-processing unit; a recording unit that prints on the recording medium that has been pretreated by an inkjet recording method, The pre-processing section includes a dry processing section that performs dry processing on the recording medium, and a pre-coating section that performs pre-coating processing on the recording medium using a pre-coating liquid, The control unit controls the intensity of the dry process and the precoat process in response to a detection result from the detection unit. death, the recording medium has a first main surface and a second main surface opposite to the first main surface, Further comprising an inversion unit that inverts the first main surface and the second main surface of the recording medium, the inversion unit being provided for printing on the first main surface and the second main surface in that order during double-sided printing; The control unit controls the detection unit so that the detection unit operates only when the printing is performed on the second main surface. A recording system comprising:

[0012] 2 The factor relating to the deformability includes the amount of printing on the first main surface. 1 Item 3. A recording system as described in item 2.

[0013] 3 The factor related to the deformability includes the rigidity of the recording medium. or paragraph 2 The recording system according to claim 1.

[0014] 4 The factors related to the deformability include environmental temperature and environmental relative humidity. 3 A recording system according to any one of claims 1 to 5.

[0015] 5 The factor relating to the deformability includes the moisture content of the recording material immediately before the pretreatment. 4 A recording system according to any one of claims 1 to 5.

[0016] 6 The factor relating to the deformability includes a maximum curl amount of the recording medium immediately before the pretreatment. 5 A recording system according to any one of claims 1 to 5.

[0017] 7 A recording method using an inkjet recording system, A pre-processing step of pre-processing a recording material; A detection step of detecting a value related to the deformability of the recording material; Pretreatment process A control step of controlling a recording step of printing on the pre-treated recording material by an inkjet recording method, the pre-treatment step includes a dry treatment step of dry-treating the recording medium or a pre-coat step of pre-coating the recording medium with a pre-coat liquid, The control step controls the intensity of the dry process or the precoat process in accordance with the detection result in the detection step. death, During double-sided printing, the recording material has a first main surface and a second main surface opposite to the first main surface, and the recording step includes a reversing step of reversing the first main surface and the second main surface to perform printing on the first main surface and the second main surface in that order, and the control step controls the detection step so that the detection step operates only when the printing is performed on the second main surface. A recording method comprising: Effect of the Invention

[0018] According to the above-mentioned means of the present invention, it is possible to provide a recording system and a recording method that suppress problems in conveying a recorded material during printing by an inkjet recording method using a water-based ink, particularly during double-sided printing. The mechanism of manifestation or action of the effects of the present invention is presumed to be as follows.

[0019] As described above, deformation such as curling of the recorded material during printing by inkjet recording method using aqueous ink is likely to occur especially during backside printing in double-sided printing. It is considered that curling of the recorded material during backside printing occurs because the surface temperature rises when drying the aqueous ink after front-side printing, reducing the moisture content of the surface and creating a difference in moisture content between the front and back sides. For this reason, it is assumed that the degree of deformation such as curling of the recorded material can be reduced by reducing the difference in moisture content between the front and back sides.

[0020] Therefore, in order to reduce the difference in moisture content between the front and back surfaces, i.e., to improve deformation such as curling of the recorded material during printing, the inventors decided to control a pretreatment to improve the wettability of the printed surface of the recorded material, specifically a dry treatment or precoat treatment, to be performed at an appropriate intensity.

[0021] Specifically, a recording system using an inkjet recording method is configured to include a pre-processing unit that pre-processes the recorded material, a detection unit that detects the value of a factor related to the deformability of the recorded material, a control unit that controls the pre-processing unit, and a recording unit that prints on the pre-processed recorded material using the inkjet recording method, and the pre-processing unit further includes a dry processing unit that dry-processes the recorded material, and a pre-coat unit that pre-coats the recorded material using a pre-coat liquid, and the control unit controls the intensity of the dry processing and the pre-coat processing depending on the detection result in the detection unit, in accordance with the configuration of the present invention.

[0022] In this specification, the "deformability" of a recording material means the ease with which the recording material is deformed due to external factors, particularly due to the inclusion of moisture. High deformability means that the recording material is easily deformed, and low deformability means that the recording material is not easily deformed.

[0023] In the present invention, as described above, by controlling the intensity of the dry process and the precoat process in the pretreatment section according to the value of the factor related to the deformability of the recorded material, it is possible to suppress problems with the transport of the recorded material when printing by an inkjet recording method using aqueous ink, particularly when printing on both sides. Examples of problems with the transport of the recorded material include a sensor installed immediately before the recording section detecting an amount of deformation of the recorded material that exceeds the allowable range, causing the transport of the recorded material to be stopped, wrinkles occurring in the recorded material within the recording section causing the recorded material to collide with the inkjet head and damage the recording section, and the recorded material having many wrinkles when it leaves the recording system. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a schematic diagram of an example of a recording system according to the present invention. [Diagram 2] FIG. 2 is a block diagram showing the main part of the control system of the printing system shown in FIG. [Diagram 3] A flowchart showing the operation control of a preprocessing unit during image formation using the recording system shown in FIG. [Figure 4]FIG. 1 is a schematic diagram of another example of a recording system according to the present invention. [Diagram 5] FIG. 5 is a block diagram showing the main part of the control system of the printing system shown in FIG. [Figure 6] A flowchart showing the operation control of a preprocessing unit during image formation using the recording system shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The recording system of the present invention is a recording system using an inkjet recording method, a pre-processing section for pre-processing a recording medium; A detection unit for detecting a value of a factor related to the deformability of the recording medium; A control unit that controls the pre-processing unit; a recording unit that prints on the recording medium that has been pretreated by an inkjet recording method, The pre-processing section includes a dry processing section that performs dry processing on the recording medium, and a pre-coating section that performs pre-coating processing on the recording medium using a pre-coating liquid, The control unit controls the intensity of the dry process and the pre-coat process in accordance with the detection result of the detection unit. The recording system of the present invention having the above configuration will hereinafter be referred to as a recording system of a first embodiment. This feature is a technical feature common to all claims of the recording system of the present invention.

[0026] In the recording system of the present invention, the recorded material has, for example, a first main surface and a second main surface opposite to the first main surface, and during single-sided printing, the recorded material is defined as being printed only on the first main surface. During double-sided printing, the first main surface of the recorded material is printed, and then the second main surface is printed. Note that printing is performed by an inkjet recording method in which an inkjet head is used to apply water-based ink to the printing surface.

[0027] The recording system of the present invention may be, for example, a recording system having one recording unit and an inversion unit that inverts the first and second main surfaces of the recorded material in order to perform double-sided printing. In a recording system that does not have an inversion unit, double-sided printing can be performed by manually inverting the first and second main surfaces of the discharged recorded material with printing on the first main surface after printing the first main surface of the recorded material and providing it to the recording system.

[0028] In the recording system of the present invention, it is preferable that the recorded object has a first main surface and a second main surface opposite to the first main surface, the recording system further has an inversion unit that inverts the first main surface and the second main surface of the recorded object so as to print on the first main surface and then the second main surface during double-sided printing, and the control unit controls the detection unit so that the detection unit operates only when the printing is performed on the second main surface (hereinafter also referred to as the ``recording system of the second embodiment'').

[0029] When double-sided printing is performed in the recording system of the second embodiment, first, the object to be recorded is transported to the recording section with the first main surface facing up, i.e., with the first main surface facing the head, and printing is performed on the first main surface. Next, the object with the first main surface printed is transported from the recording section to the inversion section and inverted. The inverted object to be recorded is transported from the inversion section to the recording section with the second main surface facing up, i.e., with the second main surface facing the head, and printing is performed on the second main surface.

[0030] In the above, when printing is performed on the first main surface of the recordable material, the recordable material usually has a sufficiently small deformability, i.e., is not easily deformed. Therefore, when printing is performed on the first main surface of the recordable material, even if the intensity of the pre-processing is not controlled by operating the detection unit that detects the value of the factor related to the deformability of the recordable material, when the specified pre-processing is performed, there is almost no problem associated with the transportation of the recordable material. On the other hand, the deformability of the recordable material with printing performed on the first main surface varies depending on the value of the factor related to the deformability of the recordable material.

[0031] Considering the above situation, in the recording system of the present invention, it is preferable to operate the detection unit to detect the value of a factor related to the deformability of the recorded material before printing on the second main surface of the recorded material whose first main surface has been printed, and to control the strength of the pre-treatment according to the detected value. This substantially eliminates problems associated with the transportation of the recorded material when printing on the second main surface.

[0032] In double-sided printing, there are cases where printing is not applied to the first main surface of the recording material, but only to the second main surface. Even in such cases, the recording material is printed on the second main surface after passing through the pre-processing section, the recording section, and the reversing section. For this reason, the recording material may be deformed before printing is applied to the second main surface, and therefore it is preferable to operate the detection section to control the intensity of the pre-processing before printing is applied to the second main surface of the recording material.

[0033] In the recording system of the present invention, when the detection unit is controlled so as to operate only when the printing is performed on the second main surface, as in the recording system of the second embodiment, it is preferable that the factor related to the deformability includes the amount of printing on the first main surface.

[0034] In the recording system of the present invention, the factors related to the deformability preferably include the stiffness of the recorded material, the environmental temperature and environmental relative humidity, the moisture content of the recorded material immediately before the pretreatment, or the maximum curl amount of the recorded material immediately before the pretreatment. Each factor may be applied alone or in combination of two or more.

[0035] The recording method of the present invention is a recording method by an inkjet recording system, A pre-processing step of pre-processing a recording material; A detection step of detecting a value related to the deformability of the recording material; a control step of controlling the pre-processing unit, and a recording step of printing on the recording medium that has been pre-processed by an inkjet recording method, the pre-treatment step includes a dry treatment step of dry-treating the recording medium or a pre-coat step of pre-coating the recording medium with a pre-coat liquid, The control step is characterized in that the intensity of the dry process or the pre-coat process is controlled in accordance with the detection result in the detection step.

[0036] Hereinafter, the present invention, its components, and the modes and aspects for carrying out the present invention will be described in detail with reference to the drawings. However, the scope of the present invention is not limited to the illustrated examples. The recording system of the illustrated examples can be modified as appropriate without departing from the spirit of the present invention. In this application, "~" is used to mean that the numerical values ​​before and after it are included as the lower and upper limits.

[0037] Fig. 1 shows a schematic configuration diagram of a recording system 1A according to a first embodiment of the present invention, which is an example of the recording system of the present invention. Fig. 2 is a block diagram showing a main part of a control system of the recording system 1A shown in Fig. 1. Fig. 3 shows a flowchart showing the operation control of a pre-processing unit during image formation using the recording system 1A shown in Fig. 1. The recording system 1A according to the first embodiment and a recording method using the same will be described with reference to Figs. 1 to 3.

[0038] FIG. 4 shows a schematic configuration diagram of a recording system 1B according to a second embodiment of the present invention, which is another example of the recording system of the present invention. FIG. 5 is a block diagram showing the main parts of a control system of the recording system 1B shown in FIG. 4. FIG. 6 is a flowchart showing the operation control of a pre-processing unit during image formation using the recording system 1B shown in FIG. 4. The recording system 1B has the same configuration as the recording system 1A, except that it has an inversion unit. The recording system 1B according to the second embodiment and a recording method using the same will be described with reference to FIGS. 4 to 6.

[0039] [First embodiment] The recording system 1A includes a pre-processing unit 3 that pre-processes the recorded material P1, a detection unit 4 that detects the value of a factor related to the deformability of the recorded material P1, a control unit 5A that controls the pre-processing unit 3, and a recording unit 2 that prints on the pre-processed recorded material P1 using an inkjet recording method.

[0040] The pre-processing section 3 has a dry processing section 33 which performs dry processing on the recording material P1, and a pre-coating section 32 which performs pre-coating processing on the recording material P1 using a pre-coating liquid.

[0041] The control unit 5A controls the intensity of the dry process and the precoat process in the preprocessing unit 3 according to the detection result in the detection unit 4. The recording system 1A includes a paper feed unit 7 that supplies a recording material P1 to the preprocessing unit 3, and a stacking unit 8 that stacks printed matter P3, which is a recording material printed in the recording unit 2.

[0042] The recordable object P1 has a first main surface S1 and a second main surface S2 opposite to the first main surface S1. In the recording system 1A, printing is performed on one of the main surfaces of the recordable object P1. Below, an example will be described in which printing is performed on the first main surface S1 of the recordable object P1. In this case, the recordable object P1 is supplied from the paper feed unit 7 to the pre-processing unit 3 so that the first main surface S1 of the recordable object P1 is pre-processed, and the pre-processed first main surface S1 is printed in the recording unit 2.

[0043] In the recording system 1A, the pre-processing unit 3, the detection unit 4, the control unit 5A and the recording unit 2 are essential components according to the present invention, while the paper feed unit 7 and the accumulation unit 8 are optional components.

[0044] The recording method of the present invention performed using the recording system 1A has a pre-processing step of pre-processing the recorded material by the pre-processing unit 3. The pre-processing step has a dry processing step or a pre-coating step. The dry processing step is performed by the dry processing unit 33 of the pre-processing unit 3 that performs dry processing on the recorded material P1. The pre-coating step is performed by the pre-coating unit 32 of the pre-processing unit 3 that performs pre-coating processing on the recorded material P1 using a pre-coating liquid.

[0045] The recording method of the present invention performed using the recording system 1A includes a detection step in which the detection unit 4 detects a value related to the deformability of the recorded material, a control step in which the control unit 5A controls a pretreatment step, and a recording step in which the recording unit 2 prints on the pretreated recorded material by an inkjet recording method. The control step controls the intensity of the dry treatment or precoat treatment depending on the detection result in the detection step. Below, each component will be described in a manner that includes an explanation of each process. The explanation of the operation of each component corresponds to the explanation of the process related to that component.

[0046] (Paper feed section) The paper feed section 7 includes a paper feed tray 71 that stores the recordable object P1, a paper feed conveying section 72 that conveys the recordable object P1 from the paper feed tray 71 to the pre-processing section 3, and a supply section 73 that supplies the recordable object P1 in the paper feed tray 71 to the paper feed conveying section 72. The paper feed conveying section 72 includes a pair of paper feed conveying rollers 721, 722, and a paper feed conveying belt 723 is stretched around these paper feed conveying rollers 721, 722. The paper feed conveying belt 723 carries the recordable object P1 supplied from the paper feed tray 71 by the supplying section 73 and conveys it to the pre-processing section 3.

[0047] (Preprocessing section) The pre-processing section 3 has at least a dry processing section 33 and a pre-coating section 32 in order to perform pre-processing on the first main surface S1 of the recording material P1 supplied from the paper feed section 7. The pre-processing section 3 may have a processing section for performing pre-processing other than the dry processing and the pre-coating processing, as necessary.

[0048] The pre-processing section 3 has a pre-processing section receiving drum 31 that receives the recordable material P1 supplied from the paper feed section 7, a pre-processing drum 34 that holds the recordable material P1 on its surface when pre-processing is performed on the first main surface S1 of the recordable material P1, and a pre-processing section delivering drum 35 that delivers the recordable material P1 after pre-processing to the recording section 2. The dry processing section 33 and the pre-coat section 32 are disposed so as to face the surface of the pre-processing drum 34. The recordable material P1 is held on the surface of the pre-processing drum 34 so that the second main surface S2 is located on the pre-processing drum 34 side and the first main surface S1 faces the dry processing section 33 and the pre-coat section 32.

[0049] In Fig. 1, the dry processing section 33 and the precoat section 32 are arranged in this order from the upstream side to the downstream side. That is, the dry processing section 33 and the precoat section 32 are arranged so that the first main surface S1 of the recording material P1 is first subjected to the dry processing and then subjected to the precoat processing. The arrangement of the dry processing section 33 and the precoat section 32 may be reversed. Note that the upstream side is the paper feed section 7 side, and the downstream side is the accumulation section 8 side. Also, as shown in Fig. 1, one pretreatment drum 34 may be arranged for the dry processing section 33 and the precoat section 32, or one each may be provided for each of the dry processing section 33 and the precoat section 32.

[0050] The dry processing section 33 has a means (device) for performing dry processing on the first main surface S1 of the recording material P1 held on the preprocessing drum 34. Examples of dry processing in the dry processing section 33 include plasma processing, corona processing, and other dry processing similar to well-known dry processing as preprocessing for printing by the inkjet recording method. Among these, in the present invention, plasma processing is preferred from the viewpoints that it can be used for a large area and can perform uniform processing within the surface.

[0051] The dry treatment means (apparatus) may be a known means (apparatus) for pretreatment of printing by inkjet recording. For example, the plasma treatment apparatus is preferably an atmospheric pressure plasma treatment apparatus capable of generating plasma at atmospheric pressure without pressure adjustment such as reducing pressure. The atmospheric pressure plasma treatment apparatus is preferably an atmospheric pressure non-equilibrium plasma treatment apparatus capable of generating non-equilibrium plasma in which the ambient gas temperature is lower than the plasma electron temperature.

[0052] In the recording system 1A, the dry processing section 33 is, for example, a dry processing section 33 that performs plasma processing, and includes a discharge electrode 331 that performs discharge in a gas phase to irradiate the first main surface S1 of the recording material P1 with plasma, and a power source 332 that applies a voltage to the discharge electrode 331. The gas phase between the discharge electrode 331 and the first main surface S1 of the recording material P1 may be atmospheric gas, but nitrogen gas, oxygen gas, or the like may be introduced into the atmospheric gas by an appropriate method, or the atmospheric gas may be replaced with nitrogen gas, oxygen gas, or the like.

[0053] Applicable discharge methods include dielectric barrier discharge, which involves inserting an insulator such as a dielectric between electrodes, corona discharge, which creates a highly non-uniform electric field on a thin metal wire, and pulse discharge, which involves applying a short pulse voltage. It is also possible to combine two or more of these methods.

[0054] In the dry processing section 33 illustrated in FIG. 1, the recordable object P1 is held on the surface of a rotary pre-processing drum 34 such that the first main surface S1 faces the discharge electrode 331. The surface of the rotary pre-processing drum 34 is made of, for example, a dielectric material. The discharge electrode 331 is fixed, and the pre-processing drum 34 rotates to transport the recordable object P1, and when the recordable object P1 passes through the area facing the discharge electrode 331, plasma, for example, atmospheric pressure non-equilibrium plasma, is irradiated onto the first main surface S1. In the dry processing section 33, instead of the rotary pre-processing drum 34, a belt conveyor type transport means or the like having a surface made of a dielectric material may be used.

[0055] The strength of the dry processing in the dry processing unit 33 is determined by the control unit 5A according to the value of a factor related to the deformability of the recorded material P1 detected by the detection unit 4, and is sent from the control unit 5A to the dry processing unit 33. In Fig. 1, the flow of signals sent from the control unit 5A is indicated by dashed lines, and the flow of signals sent to the control unit 5A is indicated by dashed lines.

[0056] In the dry processing unit 33, the intensity of the dry processing is adjusted to the intensity determined by the control unit 5A, and the dry processing is performed. The intensity of the dry processing in the dry processing unit 33 can be adjusted, for example, by adjusting the amount of irradiation energy. Note that the range of the amount of irradiation energy in the dry processing applied in the recording system of the present invention is, for example, 0 to 20 [J / cm2] in the case of plasma processing. 2 It is preferable that the range is [ ].

[0057] In the case of plasma processing, if the amount of irradiation energy is appropriately adjusted within the above range according to the control from the control unit 5A, the plasma processing can be performed without impairing the conventionally known effects while achieving the effect of the present invention of suppressing problems in the transport of the recording material P1. The conventionally known effects are, for example, the cleaning effect of the printing surface of the recording material, the roughening effect, the activation effect, the effect of improving wettability by fine porosity treatment effect, etc. Furthermore, if the amount of irradiation energy is within the above range, there is almost no problem such as deterioration of the recording material P1 due to excessive irradiation.

[0058] The amount of irradiation energy in the dry treatment can be adjusted, for example, by adjusting the applied voltage or the irradiation time. If the distance between the discharge electrode 331 and the pretreatment drum 34 is variable, the amount of irradiation energy can be adjusted by adjusting the distance. In the present invention, a method of adjusting the applied voltage or the irradiation time is preferable, and the amount of irradiation energy may be adjusted by combining the applied voltage and the irradiation time.

[0059] To adjust the time of the dry process, such as the plasma irradiation time, for example, it is advisable to adjust the transport speed of the recording material P1. However, when printing in the recording unit 2 is performed at high speed, it is desirable to shorten the time of the dry process. Methods for shortening the time of the dry process include a method of providing multiple discharge electrodes 331 and driving the required number of discharge electrodes 331 according to the required strength, and a method of adjusting the strength of the voltage applied to each discharge electrode 331.

[0060] The precoat unit 32 has a means (device) for performing a precoat process on the first main surface S1 of the recording material P1 held on the precoat drum 34. The precoat process in the precoat unit 32 may be the same as a precoat process known as a pretreatment for printing by an inkjet recording method.

[0061] Specifically, the precoat process is a process in which a precoat liquid containing a resin and a solvent (hereinafter also referred to as a "drying type precoat liquid") is applied to the first main surface S1 of the recording material P1 and dried to form a precoat layer. Alternatively, the precoat process is a process in which a precoat liquid containing an active energy polymerizable compound and a polymerization initiator (hereinafter also referred to as a "photocurable type precoat liquid") is applied to the first main surface S1 of the recording material P1 and the coating is irradiated with active energy to form a precoat layer. As the precoat liquid, a precoat liquid similar to a precoat liquid known as a pretreatment for printing by an inkjet recording method can be used.

[0062] The precoat liquid used in the precoat treatment is preferably a dry type precoat liquid. The dry type precoat liquid may contain, for example, an additive such as an acidic compound such as malonic acid in addition to a resin and a solvent, depending on the purpose. When the precoat liquid contains an acidic compound, the acidic compound reacts with an alkaline ink to aggregate the ink, thereby improving the pinning property.

[0063] 1 is a precoat unit 32 that is compatible with a precoat process using a dry type precoat liquid. The precoat unit 32 has an application unit 321 that applies the precoat liquid to the first main surface S1 of the recording material P1, and a drying unit 322 that dries the coating of the precoat liquid.

[0064] 1, the coating section 321 of the precoat unit 32 is provided on the pretreatment drum 34, and the drying section 322 is provided on the pretreatment transfer drum 35. The drying section 322 only needs to be provided downstream of the coating section 321, and may be provided downstream of the coating section 321 on the pretreatment drum 34 as necessary. In addition, when two pretreatment drums 34 are provided, one for the drying process and one for the precoat process, the coating section 321 and the drying section 322 may be provided in this order from the upstream side on the pretreatment drum for the precoat process.

[0065] A coating device suitable for a coating method appropriately selected according to the precoat liquid is used in the coating section 321. Examples of the method for coating the precoat liquid include roll coating, spin coating, spray coating, immersion, screen printing, inkjet, gravure printing, and offset printing. Among these, the roll coating or inkjet method is preferred from the viewpoint of controlling the amount of precoat liquid applied to the first main surface S1 of the recording object P1, and the roll coating is particularly preferred from the viewpoint of the cost of the device.

[0066] A drying device suitable for a drying method appropriately selected according to the type and application amount of the precoat liquid can be used as the drying section 322. Examples of the drying method include heat transfer and air blowing.

[0067] The strength of the precoat process in the precoat unit 32 is determined by the control unit 5A according to the value of a factor related to the deformability of the recording material P1 detected by the detection unit 4, and is sent from the control unit 5A to the precoat unit 32.

[0068] In the precoat unit 32, the intensity of the precoat process is adjusted to the intensity determined by the control unit 5A, and the precoat process is performed. The intensity of the precoat process in the precoat unit 32 can be adjusted, for example, by changing the type of precoat liquid or adjusting the amount of precoat liquid applied. From the viewpoint of simplifying the device, it is preferable to adjust the intensity of the precoat process by using one type of precoat liquid and adjusting the amount of precoat liquid applied. The thickness of the obtained precoat layer can be adjusted by adjusting the amount of precoat liquid applied.

[0069] Although it depends on the type of precoat liquid, the range of the coating amount of the precoat liquid applied in the recording system of the present invention is preferably an amount that results in a coating thickness in the range of 1 to 10 [μm] when the precoat liquid is a dry type precoat liquid. Hereinafter, the coating amount of the precoat liquid is indicated as a coating thickness [μm]. Also, the thickness of the precoat layer obtained thereby is preferably in the range of 0.5 to 5 [μm].

[0070] In the case of the precoat process using the precoat liquid, if the amount of application of the precoat liquid is appropriately adjusted within the above range according to the control from the control unit 5A, the precoat process can be performed without impairing the conventionally known effects while achieving the effect of the present invention of suppressing problems in the transport of the recording material P1. The conventionally known effect is, for example, the effect of improving the wettability of the printing surface of the recording material. Furthermore, if the amount of application of the precoat liquid is within the above range, there is almost no problem such as paper deformation due to insufficient drying of the coating liquid caused by excessive application, or deterioration of image quality (thinning of lines, etc.) due to excessive aggregation.

[0071] The amount of precoat liquid applied in the precoat process can be adjusted by a conventionally known method. For example, when applying the precoat liquid by an inkjet method, an inkjet head (hereinafter, simply referred to as a "head") is used as the application unit 321. In this case, the amount of precoat liquid applied to the first main surface S1 of the recording material P1 can be adjusted by adjusting the amount of precoat liquid ejected from the head. The amount of precoat liquid applied may also be adjusted by, for example, adjusting the transport speed of the recording material P1, as in the above-mentioned dry process.

[0072] For example, when applying the precoat liquid by a roll coating method, an application roller is used as the application unit 321. In this case, the rotation speed of the application roller can be changed to adjust the amount of precoat liquid applied to the first main surface S1 of the recording material P1. Also, in the roll coating method, a metering roller is used that measures a predetermined amount of precoat liquid and supplies it to the application roller. By changing the speed of this metering roller to adjust the amount of precoat liquid supplied to the application roller, it is possible to adjust the amount of precoat liquid applied to the first main surface S1 of the recording material P1.

[0073] (Detection unit) In the recording system 1A shown in Fig. 1, the detection unit 4 that detects the value of a factor related to the deformability of the recorded material P1 is provided on the pre-treatment drum 34 upstream of the dry treatment unit 33. The position at which the detection unit 4 is provided is not particularly limited as long as it is a position before pre-treatment such as the dry treatment and the pre-coat treatment is performed. The detection unit 4 may be provided on the pre-treatment unit receiving drum 31, for example.

[0074] The detection unit 4 has a detection device (indicated by reference numeral 41 in the block diagram of FIG. 2) that detects the value of a factor related to the deformability of the recording material P1. The result detected by the detection unit 4, i.e., the value of the factor related to the deformability, is transmitted to the control unit 5A.

[0075] Factors related to the deformability of the recordable object P1 include, for example, the rigidity of the recordable object P1, the environmental temperature and environmental relative humidity, the moisture content of the recordable object P1 immediately before pretreatment, or the maximum curl amount of the recordable object P1 immediately before pretreatment. In the recording system 1A, the above factors may be used alone or in combination of two or more. When combining two or more of the above factors, it is preferable to combine the rigidity of the recordable object P1 with the environmental temperature and environmental relative humidity. It is preferable to use the moisture content of the recordable object P1 immediately before pretreatment and the maximum curl amount of the recordable object P1 immediately before pretreatment individually.

[0076] The detection device 41 of the detection unit 4 is preferably one or more types of devices that measure the values ​​of the above factors. When the detection unit 4 has a plurality of detection devices 41, the order in which the devices are arranged is not particularly limited. In addition, the detection devices may be arranged separately, for example, on the pre-treatment unit receiving drum 31 and on the pre-treatment drum 34.

[0077] The rigidity of the recordable material P1 is proportional to, for example, the square root of the product of the compactness (=density) of the recordable material P1, the width of the recordable material P1, and the basis weight of the recordable material P1. In the present invention, the rigidity of the recordable material P1 is defined by "S" in the following formula (1). It is known that the larger the rigidity S, the smaller the deformation property of the recordable material P1 and the less likely it is to curl.

[0078] Equation (1); S=(d×L×t) 0.5 In formula (1), S is the stiffness of the recording material P1 [g / cm 2 d is the density (=g / cm 3 ], L is the length of the recording material P1 in the direction perpendicular to the conveying direction [cm], t is the basis weight of the recording material P1 [g / cm 2 ].

[0079] An example of a device for measuring the rigidity S of the recordable object P1 is a device for measuring the size (length in the transport direction, length in the width direction (the width direction is the direction perpendicular to the transport direction), and thickness) and mass of the recordable object P1. Hereinafter, the length in the transport direction of the recordable object P1 will be simply referred to as "length", and the length in the width direction will be simply referred to as "width".

[0080] The recording material to which the recording system of the present invention is applied is not particularly limited, and is appropriately selected according to the application. Examples of the recording material include absorbent recording materials such as uncoated paper (e.g., newsprint, plain paper, wood-free paper, thin paper) and coated paper (e.g., art paper, coated paper, light-weight coated paper, lightly coated paper, cast paper, etc.); and non-absorbent recording materials (plastic substrates) made of plastics such as polyester, polyvinyl chloride, polyethylene, polyurethane, polypropylene, acrylic resin, polycarbonate, polystyrene, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, and polybutadiene terephthalate.

[0081] Among these recording media, those with a low stiffness S, for example, those with a stiffness S of 45 [g / cm 2 In particular, the effect of the present invention is remarkable in a recording medium having a stiffness S of less than 45 [g / cm 2 In particular, a recording medium having a thickness of 0.1 mm or less has a stiffness S of 45 [g / cm 2 ] or less, and the effects of the present invention are remarkable.

[0082] The environmental temperature and the environmental relative humidity are the environmental temperature and the environmental relative humidity in the recording system 1A, and can be measured by a known thermometer and a known hygrometer, respectively. By measuring the environmental temperature and the environmental relative humidity, the moisture content [g / m 3 The greater the moisture content of the surrounding environment, the more easily the recording material P1 absorbs moisture from the atmosphere, i.e., the greater the deformation tendency and the more easily it curls.

[0083] Moisture meters that detect the moisture content of the recorded material P1 immediately before preprocessing include infrared moisture meters that utilize the absorption of moisture contained in the material in the infrared region, electrical resistance type moisture meters that pass electricity through the material and convert the resistance value into a moisture value and display it, capacitance type moisture meters that pass alternating current through the material and convert the change in capacitance into a moisture value and display it, and microwave type moisture meters that convert the amount of electrical change, such as the attenuation of microwaves due to moisture, into a moisture value and display it.

[0084] The moisture content of the recordable material P1 is indicated, for example, by the moisture content [%], which is the ratio of the mass of moisture contained in the recordable material P1 to the total mass (total solid mass) of the recordable material P1. The greater the moisture content of the recordable material P1, the greater the deformability and the greater the tendency for the recordable material P1 to curl. In the present invention, "immediately before pretreatment" refers to approximately within 1 second before pretreatment is performed. It is preferable to detect the moisture content of the recordable material P1 within 1 second before pretreatment is performed.

[0085] The maximum curl amount of the recordable object P1 immediately before pre-processing is obtained from the displacement amount in the length direction of the recordable object P1. The displacement amount in the length direction of the recordable object P1 is obtained, for example, by subtracting the height of the highest point from the height of the lowest point when the height of the first main surface S1 of the recordable object P1 is measured in the length direction at a predetermined position in the width direction when the recordable object P1 is placed on a horizontal surface. Typically, the recordable object P1 has the highest point at both ends and the lowest point in the length direction.

[0086] In the present invention, the amount of displacement in the length direction of the recordable material P1 is referred to as the amount of curl. The maximum amount of curl refers to the maximum value when the amount of displacement (amount of curl) in the length direction is measured at multiple points in the width direction of the recordable material P1, for example, at five points set at equal intervals in the width direction.

[0087] The displacement amount in the length direction of the recording material P1, i.e., the curl amount, can be detected by an optical, eddy current, ultrasonic, laser focus or contact type displacement meter. The larger the maximum curl amount of the recording material P1, the greater the deformability of the recording material P1.

[0088] (Control unit) The control unit 5A controls the intensity of the dry process and the pre-coat process according to the detection result in the detection unit 4. The control unit 5A is installed in a computer and is composed of a processor such as a CPU (Central Processing Unit). The computer equipped with the control unit 5A further includes a storage unit composed of a ROM (Read Only Memory) and a RAM (Random Access Memory). The storage unit stores various programs and various data for operating each part of the recording system 1A.

[0089] The control unit 5A loads various programs stored in a ROM or the like into a working area of ​​a RAM, for example, and executes the programs in the control unit 5A to centrally control each unit of the recording system 1A. The control system of the recording system 1A shown in FIG. 1 will be described below with reference to the block diagram shown in FIG. 2.

[0090] The control unit 5A includes a detection control unit 51, a pre-processing control unit 52, a print control unit 53, etc. The functions of the detection control unit 51, the pre-processing control unit 52, the print control unit 53, etc. are realized by cooperation between the control unit 5A and a program stored in the ROM of the storage unit.

[0091] The detection control unit 51 controls the detection device 41 of the detection unit 4 to detect the value of the factor related to the deformability of the recordable object P1. The value of the factor related to the deformability of the recordable object P1 detected by the detection unit 4 is sent to the detection control unit 51. The detection control unit 51 functions as an acquisition means for acquiring the value of the factor related to the deformability of the recordable object P1.

[0092] In the preprocessing control unit 52, the intensity of the dry processing in the dry processing unit 33 and the intensity of the precoat processing in the precoat processing unit 32 are determined based on the value of the factor related to the deformability of the recording material P1 acquired by the detection control unit 51 and the preprocessing control program stored in the ROM. The intensity of the dry processing and the intensity of the precoat processing determined in the preprocessing control unit 52 are sent from the preprocessing control unit 52 to the dry processing unit 33 and the precoat processing unit 32, respectively. Then, the dry processing and the precoat processing are performed on the first main surface S1 of the recording material P1 at the determined intensities.

[0093] Based on image data transmitted from an external device, the print control unit 53 operates the inkjet head 22 of the recording unit 2 to form a printing layer (image) on the first main surface S1 of the pre-processed recording material P1 by inkjet recording.

[0094] The program cooperates with the pre-processing control unit 52, and for example, a flowchart showing the operation control of the pre-processing unit 3 during image formation using the recording system 1A shown in FIG. 3 will be described.

[0095] The flowchart in Fig. 3 shows the operation control of the pre-processing unit (setting of pre-processing conditions) when the stiffness of the recording medium P1, the environmental temperature and the environmental relative humidity are combined as factors related to the deformability of the recording medium P1. As described above, the environmental temperature and the environmental relative humidity are determined based on the moisture content [g / m 3 ] is used to control the operation of the preprocessing unit.

[0096] In addition, when comparing the precoat process and the dry process in the preprocessing, the dry process is advantageous from the viewpoint of running costs. On the other hand, from the viewpoint of the effect of suppressing the malfunction of the transport of the recording material according to the present invention, a greater effect can be obtained by setting conditions in the precoat process. Therefore, as a basic preprocessing method, when the deformability of the recording material P1 is small, it is preferable to perform only the dry process without performing the precoat process, and when the deformability of the recording material P1 is large, it is preferable to perform only the precoat process without performing the dry process, or to perform a preprocessing that combines the dry process and the precoat process.

[0097] In the flowchart shown in FIG. 3, in step S11, the amount of moisture in the surrounding environment is determined as Y [g / m 3 The threshold value Y of the moisture content of the surrounding environment is, for example, 15 [g / m 3 If step S11 is YES, the process proceeds to step S15. In step S15, the intensity level of the precoat process is set to the range of Pr2 in relation to the operation of the pre-processing unit 3. In step S15, it is preferable not to perform a dry process.

[0098] A specific condition for the intensity level Pr2 of the precoat treatment in step S15 is, for example, a condition in which the amount of the precoat liquid applied is set in the range of 5 to 10 μm. Note that the intensity of the precoat treatment in step S15 can be appropriately adjusted within the range of Pr2 according to the moisture content of the surrounding environment.

[0099] If step S11 is NO, in step S12, the rigidity S of the recording material P1 is Z [g / cm 2 The threshold Z of the stiffness S of the recording material P1 is, for example, 45 [g / cm 2 If step S12 is YES, the process proceeds to step S13. In step S13, the intensity level of the dry process is set to the range of D1 in relation to the operation of the pre-processing unit 3. In step S13, it is preferable not to perform a pre-coat process.

[0100] Specific conditions for the intensity level D1 of the dry process in step S13 include, for example, setting the plasma irradiation energy amount in the plasma process to 0 to 20 [J / cm 2 The strength of the dry process in step S13 can be adjusted appropriately within the range of D1 according to the moisture content of the surrounding environment and the value of the stiffness S of the recording material P1.

[0101] If step S12 is NO, proceed to step S14. In step S14, the intensity level of the pre-coating process is set to a range of Pr1, which is lower than Pr2, in relation to the operation of the pre-processing unit 3. It is preferable not to perform dry processing in step S14. The intensity level of the pre-coating process being Pr1 means that the intensity of the pre-processing is higher than the intensity level D1 of the dry processing.

[0102] 3, the deformability of the record medium P1 is smallest for the record medium P1 subjected to step S13, followed by the record medium P1 subjected to step S14 and then the record medium P1 subjected to step S15. Accordingly, the strength relationship in the pre-processing from step S13 to step S15 is step S13<step S14<step S15.

[0103] Specific conditions for the strength level Pr1 of the precoat process in step S14 include, for example, a condition in which the amount of the precoat liquid applied is set in the range of 1 to 5 μm. Note that the strength of the precoat process in step S14 can be appropriately adjusted within the range of Pr1 according to the amount of moisture in the surrounding environment and the value of the stiffness S of the recording material P1.

[0104] In addition, when the moisture content of the recording material P1 immediately before preprocessing is used alone as a factor related to the deformability of the recording material P1, the operation control of the preprocessing unit (setting of preprocessing conditions) can be, for example, as follows.

[0105] When the moisture content of the recording material P1 immediately before the pretreatment is 40% or more in terms of moisture content, it is preferable to perform the pretreatment similar to the above step S15. That is, in relation to the operation of the pretreatment unit 3, it is preferable to set the intensity level of the precoat treatment to Pr2, specifically, the application amount of the precoat liquid to, for example, 5 to 10 μm.

[0106] In addition, if the moisture content of the recording material P1 immediately before the pre-processing is 20% or more and less than 40% as a moisture content, the above step S13 (for example, the amount of plasma irradiation energy is set to 0 to 20 [J / cm 2 It is preferable to perform pretreatment similar to step S14 (for example, the amount of the precoat liquid applied is set to 1 to 5 μm) or step S15 (for example, the amount of the precoat liquid applied is set to 1 to 5 μm).

[0107] Furthermore, when the maximum curl amount of the recording material P1 immediately before preprocessing is used as a factor related to the deformability of the recording material P1, the operation control of the preprocessing unit (setting of preprocessing conditions) can be, for example, as follows.

[0108] When the maximum curl amount of the recording material P1 immediately before the pretreatment is 1 [mm] or more, it is preferable to perform the pretreatment similar to the above step S15. That is, in relation to the operation of the pretreatment unit 3, it is preferable to set the intensity level of the precoat treatment to Pr2, specifically, the application amount of the precoat liquid to, for example, 5 to 10 μm.

[0109] Furthermore, if the maximum curl amount of the recording material P1 immediately before the pretreatment is less than 1 [mm], it is preferable to carry out the pretreatment in the same manner as in step S13 or step S14.

[0110] (Recording Department) The recording unit 2 includes an image forming drum 21 that holds the recording material P1 on its surface in order to print on the pre-processed first main surface S1 of the recording material P1, in other words, to form an image. The recording material P1 is delivered from the pre-processing unit delivery drum 35 to the image forming drum 21. In the recording unit 2, a paper floating sensor 26 and an inkjet head 22 are arranged around the image forming drum 21.

[0111] The recording unit 2 has, in that order from the upstream side, transport drums 231, 232, and 233 that transport the recorded object P1 from the image forming drum 21 toward the collecting unit 8, and an ink drying unit 24 is disposed around the transport drum 232. By passing through the ink drying unit 24, the recorded object P1 becomes a printed object P3 having a printing layer (image) formed on a first main surface S1. The printed object P3 is delivered from the transport drum 233 to the collecting unit 8.

[0112] The paper float sensor 26 is provided upstream of the head 22. The paper float sensor 26 is not an essential component of the printing system 1A, but is a preferable component to provide. The paper float sensor 26 detects the amount of deformation, for example the amount of curl, of the preprocessed recording material P1. The detection result is sent to the control unit 5A, and if the amount of deformation is equal to or greater than a predetermined value, the transport of the recording material P1 is stopped under the control of the control unit 5A. The paper float sensor 26 has a function of preventing the recording material P1 from colliding with the head 22.

[0113] The recording system of the present invention makes it possible to suppress such problems in the transport of the recorded object P1 in the recording section. Specifically, in the recording system 1A, the detection section 4, the pre-processing section 3, and the control section 5A are operated as described above so that the deformation amount of the pre-processed recorded object P1 falls within a predetermined range, thereby suppressing the stop of the transport of the recorded object P1 due to the action of the paper float sensor 26, and the occurrence of the collision of the recorded object P1 with the head 22 in the case where the paper float sensor 26 is not provided.

[0114] The inkjet head 22 is a line-type head, and is made up of a total of four inkjet heads, namely, a black inkjet head 22bk, a cyan inkjet head 22c, a magenta inkjet head 22m, and a yellow inkjet head 22y, which are provided along the circumferential direction of the image forming drum 21. The number of inkjet heads 22 may be increased or decreased as necessary.

[0115] The inkjet head 22 ejects ink toward the first main surface S1 of the recording medium P1 based on a signal sent from the print control unit 53 of the control unit 5A, causing the ink to land on the first main surface S1. The ink used in the present invention is a water-based ink containing an aqueous solvent including water. The aqueous solvent is dried in the ink drying unit 24 of the transport drum 232 from the ink layer obtained by landing on the first main surface S1 to form a printed layer, and printing is completed.

[0116] As the aqueous ink used in the recording system of the present invention, a conventionally known aqueous inkjet ink can be used. Typically, the aqueous ink contains a colorant and an aqueous solvent containing water. The aqueous solvent can contain water and optionally a water-soluble organic solvent. The aqueous ink may contain a dispersant for dispersing the colorant, a surfactant, and a binder resin for fixing the colorant to the recording material P1, as necessary.

[0117] The content of the coloring material in the aqueous ink is preferably within a range of 1.0 to 10% by mass, and more preferably within a range of 2.0 to 7.0% by mass, based on the total amount of the aqueous ink. The content of the aqueous solvent in the aqueous ink is preferably within a range of 85 to 99% by mass, and more preferably within a range of 90 to 97% by mass, based on the total amount of the aqueous ink.

[0118] Heating is preferred as the drying means in the ink drying section 24, and the heater is preferably an electric heater, an infrared heater, etc. Drying in the ink drying section 24 is preferably carried out until the water content in the printed layer after drying is 25 mass % or less with respect to the total amount of recorded ink, that is, until the moisture content in the printed layer is 25% or less, and more preferably until the moisture content is 10% or less.

[0119] (Stacking section) The accumulation section 8 includes a storage tray 81 that stores the recorded material (printed matter P3) after printing, and an accumulation transport section 82 that transports the printed matter P3 from the recording section 2 to the storage tray 81. The accumulation transport section 82 is provided with a plurality of accumulation transport rollers 821, 822, and 823. Of the plurality of accumulation transport rollers 821 to 823, one accumulation transport roller 821 is disposed within the recording section 2, and the remaining accumulation transport rollers 822 and 823 are disposed within the accumulation section 8.

[0120] The recorded material (printed material P3) on which printing has been completed in the recording unit 2 is conveyed while being held on the accumulation conveyor belt 824 by an accumulation claw portion (not shown), and when it reaches the storage tray 81, the holding by the accumulation claw portion is released and the printed material is stored in the storage tray 81. A cooling unit 25 for cooling the printed material P3 conveyed from the conveyor drum 233 is provided around the accumulation conveyor belt 824.

[0121] [Second embodiment] 4 is a recording system capable of double-sided printing, and includes, in addition to the components of recording system 1A, an inversion unit 6 that inverts the first main surface S1 and the second main surface S2 of the recording medium P1. In recording system 1B, printing during single-sided printing is performed on the first main surface S1 of the recording medium P1, and printing during double-sided printing is performed on the first main surface S1 and then the second main surface S2 of the recording medium P1. There are cases in which printing is not performed on the first main surface S1 during double-sided printing, and printing is performed only on the second main surface S2, and this is also included in double-sided printing.

[0122] In the recording system 1B, in the case of single-sided printing, the recordable object P1 with the first main surface S1 printed thereon is transported from the recording unit 2 to the stacking unit 8 as a printed object P3. In the case of double-sided printing, the recordable object P1 that has passed through the recording unit 2 is transported to the inversion unit 6 to have the second main surface S2 printed thereon, where the first main surface S1 and the second main surface S2 are inverted and supplied to the pre-processing unit 3. Hereinafter, the recordable object P1 transported from the recording unit 2 to the inversion unit 6 is referred to as the "recordable object P2." In this way, the recordable object P2 is supplied from the inversion unit 6 to the pre-processing unit 3 so that the second main surface S2 of the recordable object P2 is pre-processed, and the pre-processed second main surface S2 is printed in the recording unit 2.

[0123] The components and control system of recording system 1B will be described below with reference to Figs. 4 to 6. The recording method of the present invention performed using recording system 1B has a pre-processing step in which the pre-processing unit 3 pre-processes the object to be recorded. The pre-processing step has a dry processing step or a pre-coating step. The dry processing step is performed by dry processing unit 33 of pre-processing unit 3 which performs dry processing on the object to be recorded. The pre-coating step is performed by pre-coating unit 32 of pre-processing unit 3 which performs pre-coating processing on the object to be recorded using a pre-coating liquid.

[0124] The recording method of the present invention performed using the recording system 1B includes a detection step of detecting a value related to the deformability of the recording material by the detection unit 4, a control step of controlling a pre-processing step by the control unit 5A, and a recording step of printing the pre-processed recording material by the recording unit 2 using an inkjet recording method. Furthermore, the recording method of the present invention performed using the recording system 1B includes an inversion step of inverting the first main surface S1 and the second main surface S2 of the recording material P1 by the inversion unit 6. The control step controls the intensity of the dry process or the pre-coat process according to the detection result in the detection step. The following description of each component includes the description of each process. The description of the operation of each component corresponds to the description of the process related to that component.

[0125] Here, among the components shared by recording system 1B and recording system 1A, the paper feed unit 7, pre-processing unit 3, recording unit 2, and stacking unit 8 are similar in configuration and operation to those of the components in recording system 1A, and so a description thereof will be omitted. Among the components shared by recording system 1B and recording system 1A, the detection unit 4 and control unit 5B, which have different configurations and operations from those of recording system 1A, and the reversing unit 6, which is unique to recording system 1B, will be described below.

[0126] In recording system 1B, preprocessing unit 3 may preprocess the first main surface S1 of recordable object P1 supplied from paper feed unit 7, and may preprocess the second main surface S2 of recordable object P2 supplied from reversing unit 6, but the configuration for performing preprocessing itself may be the same as the configuration of preprocessing unit 3 in recording system 1A. Recording unit 2 may print on the first main surface S1 of recordable object P1, and may print on the second main surface S2 of recordable object P2, but the configuration for performing printing itself may be the same as the configuration of recording unit 2 in recording system 1A.

[0127] (reversal part) The reversing unit 6 has a reversing-unit receiving drum 61 that receives the record material P2 transported from the transport drum 233 of the recording unit 2, reversing-unit transport rollers 63, 64 and a reversing-unit transport belt 65 that transport the record material P2 within the reversing unit 6, and a reversing-unit transfer drum 62 that transfers the record material P2 from the reversing unit 6 to the pre-processing unit receiving drum 31. The record material P2 is reversed while being transported from the reversing-unit receiving drum 61 to the reversing-unit transfer drum 62 within the reversing unit 6.

[0128] Whether the recordable material P1 that has passed through the recording unit 2 is transported to the reversing unit 6 or to the stacking unit 8 is controlled by a signal sent from the reversing control unit 54 of the control unit 5B to the reversing unit receiving drum 61. In FIG. 4, the reversing unit receiving drum 61 is shown in contact with the transport drum 233 of the recording unit 2. In this case, the recordable material P1 that has passed through the recording unit 2 is transported to the reversing unit 6 as the recordable material P2. Meanwhile, the reversing unit receiving drum 61 is provided so as to be movable so as to be spaced apart from the transport drum 233 of the recording unit 2 by a distance equal to or greater than the thickness of the recordable material P1. When there is a distance between the reversing unit receiving drum 61 and the transport drum 233 of the recording unit 2 that is equal to or greater than the thickness of the recordable material P1, the recordable material P1 that has passed through the recording unit 2 is transported to the stacking unit 8 as the printed material P3.

[0129] (Detection unit) In the recording system 1B, the detection unit 4 detects the value of a factor related to the deformability of the recording material supplied to the pre-processing unit 3, and transmits the detection result to the control unit 5B. In the recording system 1B shown in FIG. 4, the recording material supplied to the pre-processing unit 3 is the recording material P1 supplied from the paper feed unit 7 or the recording material P2 supplied from the reversing unit 6. The factors related to the deformability of the recording material detected by the detection unit 4 for the recording material P1 are as described in the recording system 1A. On the other hand, as the factor related to the deformability of the recording material P2, in addition to the factors related to the deformability of the recording material P1, it is preferable to use the printing amount on the first main surface S1.

[0130] In the recording system 1B, the detection unit 4 is provided in two places, around the pre-treatment unit receiving drum 31 and around the pre-treatment drum 34. For example, the detection unit 4 provided around the pre-treatment unit receiving drum 31 detects the print amount on the first main surface S1, while other factors related to deformability, such as the rigidity of the recorded material, the environmental temperature and environmental relative humidity, the moisture amount of the recorded material immediately before pre-treatment, and the maximum curl amount of the recorded material immediately before pre-treatment, are provided upstream of the dry treatment unit 33 around the pre-treatment drum 34.

[0131] The position where the detector 4 is disposed is appropriately set upstream of the position where the pre-processing such as the dry process and the pre-coat process is performed, depending on the type of factor related to the deformability to be detected. For example, it is preferable that the print amount on the first main surface S1 is detected around the pre-processing receiving drum 31 so that the print amount on the first main surface S1 of the recording material is measured at a location opposite to the drum side to which the recording material is transported. In addition, it is preferable that the moisture amount of the recording material immediately before pre-processing and the maximum curl amount of the recording material immediately before pre-processing are disposed upstream of the dry processing unit 33 around the pre-processing drum 34.

[0132] Among the factors related to deformation, the rigidity of the recorded material, the environmental temperature and environmental relative humidity, the moisture content of the recorded material immediately before pretreatment, and the maximum curl amount of the recorded material immediately before pretreatment are the same in the detection device and detection method used for the recorded material P1 and the recorded material P2. The detection device and detection method described for the recorded material P1 in the recording system 1A can also be applied to the recording system 1B.

[0133] Among the factors related to deformability, the printing amount on the first main surface S1 is a factor specific to the recording material P2. The printing amount on the first main surface S1 is detected, for example, from image data transmitted from an external device. In this case, a detection unit is also provided in the control unit 5B in addition to the detection unit 4 shown in FIG. 4. The greater the printing amount on the first main surface S1, the greater the deformability of the recording material P2 and the easier it is to curl. Specifically, the printing amount is used as an index as the percentage [%] of the area of ​​the printing layer relative to the entire first main surface and / or the density of the printing layer. The detection unit 4 is a scanner, a camera, or the like that reads images.

[0134] (Control unit) The control unit 5B in the recording system 1B controls the intensity of the dry process and the pre-coat process according to the detection result in the detection unit 4. The control unit 5B, like the control unit 5A in the recording system 1A, is mounted on a computer and is composed of a processor such as a CPU. The computer in which the control unit 5B is mounted further includes a storage unit composed of a ROM, a RAM, etc. The storage unit stores various programs and various data for operating each unit of the recording system 1B.

[0135] The control unit 5B loads various programs stored in a ROM or the like into a working area of ​​a RAM, for example, and executes the programs in the control unit 5B to centrally control each unit of the recording system 1B. The control system of the recording system 1B shown in FIG. 4 will be described below with reference to the block diagram shown in FIG. 5.

[0136] The control unit 5B includes a detection control unit 51, a pre-processing control unit 52, a printing control unit 53, an inversion control unit 54, etc. The functions of the detection control unit 51, the pre-processing control unit 52, the printing control unit 53, the inversion control unit 54, etc. are realized by cooperation between the control unit 5B and a program stored in the ROM of the storage unit.

[0137] The detection control unit 51 controls the detection device 41 of the detection unit 4 to detect the value of the factor related to the deformability of the recordable object P1 or the recordable object P2. The value of the factor related to the deformability of the recordable object P1 or the recordable object P2 detected by the detection unit 4 is sent to the detection control unit 51. The detection control unit 51 functions as an acquisition means for acquiring the value of the factor related to the deformability of the recordable object P1 or the recordable object P2.

[0138] The control unit 5B can control the operation of the pre-processing unit 3 in the same manner when the object to be recorded is the object to be recorded P1 and when the object to be recorded is the object to be recorded P2. For example, the control unit 5B can control the operation of the pre-processing unit 3 in the same manner as the control of the operation of the pre-processing unit 3 when an image is formed on the first main surface S1 of the object to be recorded P1 in the recording system 1A.

[0139] In the recording system 1B, when the recordable object is recordable object P2, it is preferable that the detection control unit 51 controls the detection unit 4 to detect the printing amount on the first main surface S1 as a factor related to the deformability of the recordable object, and that the obtained value of the printing amount on the first main surface S1 is used for the control of the preprocessing unit 3 by the preprocessing control unit 52, either alone or in combination with the detection results of other factors. Also, it is preferable that the detection control unit 51 can control the detection unit 4 to operate when the recordable object is recordable object P2, and not to operate the detection unit 4 when the recordable object is recordable object P1.

[0140] Such control by the detection control unit 51 is performed because, when the object to be recorded is the object P1, the deformation of the object P1 after pre-processing such as the well-known dry processing and pre-coating processing is not so large that transport problems hardly occur. When the object to be recorded is the object P1, for example, a predetermined pre-processing is performed under the control of the pre-processing control unit 52 without operating the detection unit 4. As the pre-processing in this case, the dry processing is preferable from the viewpoint of running costs.

[0141] In the pre-processing control unit 52, the intensity of the dry processing in the dry processing unit 33 and the intensity of the pre-coat processing in the pre-coat unit 32 are determined based on the values ​​of factors related to the deformability of the recorded material acquired by the detection control unit 51 and the pre-processing control program stored in ROM.

[0142] As described above, when the recording material is recording material P1 and the detection unit 4 is not operated, the preprocessing control unit 52 determines the intensity of the dry processing in the dry processing unit 33 and the intensity of the precoat processing in the precoat processing unit 32 based on the preprocessing control program stored in the ROM. The intensity of the dry processing and the intensity of the precoat processing determined by the preprocessing control unit 52 are sent from the preprocessing control unit 52 to the dry processing unit 33 and the precoat processing unit 32, respectively. Then, the dry processing and the precoat processing are performed on the first main surface S1 of the recording material P1 or the second main surface S2 of the recording material P2 at the determined intensities.

[0143] The printing control unit 53 operates the inkjet head 22 of the recording unit 2 based on image data transmitted from an external device to form a printing layer (image) on the first main surface S1 of the pre-processed recorded material P1 or on the second main surface S2 of the pre-processed recorded material P2, or by an inkjet recording method.

[0144] The inversion control unit 54 controls the inversion device 6a (components 61 to 65 shown in FIG. 4 are collectively referred to as the inversion device 6a) in the inversion unit 6 based on image data transmitted from an external device. Specifically, when the image data is only for the first main surface of the recording medium (in the case of single-sided printing), the inversion unit receiving drum 61 is moved to a position away from the transport drum 233 under the control of the inversion control unit 54 so that the recording medium printed on one side in the recording unit 2 is transported from the recording unit 2 to the stacking unit 8 as the printed matter P3.

[0145] Furthermore, when image data is present on the first main surface S1 and the second main surface S2 of the recordable object, or when image data is present only on the second main surface S2 of the recordable object (in the case of double-sided printing), the reversing unit receiving drum 61 is controlled by the reversing control unit 54 to move to a position in contact with the transport drum 233 so that the recordable object, on whose first main surface S1 has or has not been printed by the recording unit 2, is transported from the recording unit 2 to the reversing unit 6 as the recordable object P2. Furthermore, during double-sided printing, the reversing unit receiving drum 61 is controlled by the reversing control unit 54 to a position away from the transport drum 233 so that the recordable object, on whose second main surface S2 has been printed by the recording unit 2, is transported from the recording unit 2 to the stacking unit 8 as the printed object P3.

[0146] The program cooperates with the pre-processing control unit 52, and for example, a flow chart showing the operation control of the pre-processing unit 3 during image formation using the recording system 1B shown in FIG. 6 will be described.

[0147] The flowchart in Figure 6 is a flowchart of the operation control of the pre-processing unit 3 when the surface to be printed is the first main surface S1 (when the object to be recorded is object P1), the detection unit 4 is not operated and a specified pre-processing is performed, and when the surface to be printed is the second main surface S2 (when the object to be recorded is object P2), the detection unit 4 is operated and the intensity of the pre-processing is determined according to the detection result.

[0148] 6 is a flowchart showing the operation control of the pre-processing unit (setting of pre-processing conditions) when the print amount on the first main surface S1 of the recording medium P2, the rigidity of the recording medium P2, the environmental temperature and the environmental relative humidity are combined as factors related to the deformability of the recording medium P2. As described above, the environmental temperature and the environmental relative humidity are calculated based on the moisture content [g / m 3 ] is used to control the operation of the preprocessing unit.

[0149] In the flow chart shown in FIG. 6, in step S20, it is determined whether the surface to be printed is the first main surface or the second main surface. If the determination in step S20 is that it is the first main surface, the detection unit 4 is not operated, and the process proceeds to step S10. In step S10, the intensity level of the dry process is set to the range D10 in relation to the operation of the pre-processing unit 3. In step S10, it is preferable not to perform a pre-coat process.

[0150] Specific conditions for the intensity level D10 of the dry processing in step S10 include, for example, setting the plasma irradiation energy amount in the plasma processing to 0 to 20 [J / cm 2 The intensity of the dry process in step S10 is a predetermined intensity based on a pre-processing control program stored in the ROM.

[0151] If the determination in step S20 is that of the second principal surface, the detection unit 4 is operated to detect the print amount of the first principal surface S1, the rigidity S of the recording medium P2, and the moisture content [g / m 3The detection result of [ is used to control the operation of the pre-processing unit. If the determination in step S20 is the second main surface, the process proceeds to step S21, where it is determined whether the printing amount of the first main surface is equal to or greater than X [%] (YES) or not (NO). X, which is the threshold value for the printing amount of the first main surface, can be set to 50 [%], for example. If the determination in step S21 is YES, the process proceeds to step S22, and if the determination is NO, the process proceeds to step S31.

[0152] In step S22, the moisture content of the surrounding environment is calculated as Y [g / m 3 In step S22, the threshold value Y of the moisture amount of the surrounding environment is set to, for example, 15 [g / m 3 If step S22 is YES, the process proceeds to step S24. In step S24, the intensity level of the precoat process is set to the range of Pr13 in relation to the operation of the pre-processing unit 3. In step S24, it is preferable not to perform a dry process.

[0153] Specific conditions for the strength level Pr13 of the precoat process in step S24 include, for example, a condition in which the amount of precoat liquid applied is set in the range of 5 to 10 μm. Note that the strength of the precoat process in step S24 can be appropriately adjusted within the range of Pr13 according to the amount of printing on the first main surface S1 and the amount of moisture in the surrounding environment.

[0154] If step S22 is NO, the process proceeds to step S23, and the rigidity S of the recording material P2 is Z [g / cm 2 In step S23, it is determined whether the threshold Z of the stiffness S of the recording material P2 is, for example, 45 [g / cm 2 If step S23 is YES, the process proceeds to step S25. In step S25, the intensity level of the dry process is set to the range of D13 in relation to the operation of the pre-processing unit 3. In step S25, it is preferable not to perform the pre-coat process.

[0155] Specific conditions for the intensity level D13 of the dry process in step S25 include, for example, setting the plasma irradiation energy amount in the plasma process to 0 to 7 [J / cm 2 The strength of the dry process in step S25 can be adjusted appropriately within the range of D13 according to the print amount on the first main surface S1, the moisture content of the surrounding environment, and the value of the stiffness S of the recording material P2.

[0156] If step S23 is NO, the process proceeds to step S26. In step S26, the intensity level of the precoat process is set to the range of Pr12 in relation to the operation of the pre-processing unit 3. In step S26, it is preferable not to perform a dry process.

[0157] Specific conditions for the strength level Pr12 of the precoat process in step S26 include, for example, a condition in which the amount of precoat liquid applied is set in the range of 3 to 5 μm. Note that the strength of the precoat process in step S26 can be appropriately adjusted within the range of Pr12 according to the printing amount on the first main surface S1, the moisture content of the surrounding environment, and the value of the stiffness S of the recording material P2.

[0158] In step S21, if it is determined that the printing amount on the first main surface is not equal to or greater than X [%] (NO), the process proceeds to step S31, in which the moisture amount of the surrounding environment is determined to be Y [g / m 3 In step S31, the threshold value Y of the moisture amount of the surrounding environment is set to, for example, 15 [g / m 3 If step S31 is YES, the process proceeds to step S35. In step S35, the intensity level of the precoat process is set to the range of Pr14 in relation to the operation of the pre-processing unit 3. In step S35, it is preferable not to perform a dry process.

[0159] Specific conditions for the strength level Pr14 of the precoat process in step S35 include a condition in which the amount of precoat liquid applied is set in the range of, for example, 5 to 10 μm. Note that the strength of the precoat process in step S35 can be appropriately adjusted within the range of Pr14 according to the printing amount on the first main surface S1 and the moisture content of the surrounding environment.

[0160] If step S31 is NO, the process proceeds to step S32, where the rigidity S of the recording material P1 is Z [g / cm 2 In step S32, it is determined whether the threshold Z of the stiffness S of the recording material P1 is, for example, 45 [g / cm 2 If step S32 is YES, the process proceeds to step S33. In step S33, the intensity level of the dry process is set to the range of D11 in relation to the operation of the pre-processing unit 3. In step S33, it is preferable not to perform the pre-coat process.

[0161] Specific conditions for the intensity level D11 of the dry process in step S33 include, for example, setting the plasma irradiation energy amount in the plasma process to 0 to 20 [J / cm 2 In addition, it is preferable to appropriately adjust the strength of the dry process in step S33 within the range of D11 according to the print amount of the first main surface S1, the moisture amount of the surrounding environment, and the value of the stiffness S of the recording material P2.

[0162] If step S32 is NO, proceed to step S34. In step S34, the intensity level of the precoat process is set to a range of Pr11, which is lower than Pr14, in relation to the operation of the pre-processing unit 3. It is preferable not to perform dry processing in step S34. The intensity level of the precoat process being Pr11 means that the intensity of the preprocessing is higher than the intensity level D11 of the dry processing.

[0163] Specific conditions for the strength level Pr11 of the precoat process in step S34 include, for example, a condition in which the amount of the precoat liquid applied is set in the range of 1 to 5 μm. Note that it is preferable to appropriately adjust the strength of the precoat process in step S34 within the range of Pr11 according to the printing amount on the first main surface S1, the moisture content of the surrounding environment, and the value of the stiffness S of the recording material P2.

[0164] 6, if the answer is YES in step S21, the deformability of the record medium P2 is smallest for the record medium P2 subjected to step S25, followed by the record medium P2 subjected to step S26 and the record medium P2 subjected to step S24. Accordingly, the relationship of strength in the pre-processing from step S24 to step S26 is step S25<step S26<step S24.

[0165] Also, if the result in step S21 is NO, the deformability of the record medium P2 is smallest for the record medium P2 subjected to step S33, followed by the record medium P2 subjected to step S34 and then the record medium P2 subjected to step S35. Accordingly, the strength relationship in the pre-processing from step S33 to step S35 is step S33<step S34<step S35.

[0166] Furthermore, when the surface to be printed is the first main surface S1 (when the object to be recorded is object P1), the detection unit 4 is not operated and a specified pre-processing is performed, and when the surface to be printed is the second main surface S2 (when the object to be recorded is object P2), the detection unit 4 is operated and the intensity of the pre-processing is determined according to the detection results. In this case, when the moisture content of the object to be recorded P2 immediately before the pre-processing is used alone as a factor related to the deformability of the object to be recorded P2, the operation control of the pre-processing unit 3 (setting of the pre-processing conditions) can be, for example, as follows:

[0167] When the surface to be printed is the first main surface, the operation of the pre-processing section 3 is performed, and the strength level of the dry processing is set to the range of D10, for example, as in step S10 above. In this case, it is preferable not to perform the pre-coat processing. When the surface to be printed is the second main surface, and the moisture content of the recording material P2 immediately before the pre-processing is 40% or more in terms of moisture content, it is preferable to perform the pre-processing in the same manner as in step S24 above. That is, it is preferable to perform the pre-coat processing strength level to Pr13, specifically, the application amount of the pre-coat liquid to, for example, 5 to 10 μm, as in the operation of the pre-processing section 3.

[0168] In addition, if the moisture content of the recording material P2 immediately before the pre-processing is 20% or more and less than 40% in terms of moisture content, the above step S25, step S33 or step S35 (for example, the amount of plasma irradiation energy is set to 0 to 20 [J / cm 2 It is preferable to perform pretreatment in the same manner as in step S34 or step S26 (for example, the amount of the precoat liquid applied is set to 1 to 5 μm).

[0169] Furthermore, when the surface to be printed is the first main surface S1 (when the object to be recorded is object P1), the detection unit 4 is not operated and a specified pre-processing is performed, and when the surface to be printed is the second main surface S2 (when the object to be recorded is object P2), the detection unit 4 is operated and the intensity of the pre-processing is determined according to the detection results. In this case, when the maximum curl amount of object P2 immediately before the pre-processing is used as a factor related to the deformability of object P2, the operation control of the pre-processing unit 3 (setting of the pre-processing conditions) can be, for example, as follows:

[0170] When the surface to be printed is the first main surface, the operation of the pre-processing section 3 is performed, and for example, the strength level of the dry processing is set to the range of D10, similar to step S10 described above. In this case, it is preferable not to perform the pre-coat processing. When the surface to be printed is the second main surface, and the maximum curl amount of the recording material P2 immediately before the pre-processing is 1 [mm] or more, it is preferable to perform the pre-processing, similar to step S24 described above. That is, it is preferable to perform the operation of the pre-processing section 3, and set the strength level of the pre-coat processing to Pr13, specifically, the application amount of the pre-coat liquid to, for example, 5 to 10 μm.

[0171] In addition, if the maximum curl amount of the recording material P2 immediately before the pre-processing is less than 1 [mm], the above step S25, step S33 or step S35 (for example, the amount of plasma irradiation energy is set to 0 to 20 [J / cm 2 It is preferable to perform pretreatment in the same manner as in step S34 or step S26 (for example, the amount of the precoat liquid applied is set to 1 to 5 μm).

[0172] The recording system and the recording method of the present invention have been described above using the recording system 1A and the recording system 1B as examples, but the recording system and the recording method of the present invention are not limited to these. The recording system and the recording method of the illustrated example can be appropriately modified without departing from the spirit of the present invention. The recording system and the recording method of the present invention are a recording system and a recording method that suppresses problems in the transport of the recorded material during printing by an inkjet recording method using aqueous ink, especially during double-sided printing. [Explanation of symbols]

[0173] 1A,1B Recording System 2 Recording section 3 Pretreatment section 4. Detection section 5A,5B control section 6 Reversal section 7 Paper feed section 8. Accumulation section 21 Image forming drum 22, 22y, 22m, 22c, 22bk Inkjet Head 231, 232, 233 Conveyor drum 24 Ink drying section 25 Cooling section 26 Paper floating sensor 31 Pre-treatment section receiving drum 32 Precoat Section 321 Application section 322 Drying section 33 Dry Processing Section 331 Discharge electrode 332 Power supply 34 Pre-treatment drum 35 Pre-treatment section transfer drum 61 Reversing section receiving drum 62 Reversing section transfer drum 63, 64 Reversing section transport roller 65 Reversing conveyor belt 71 Paper feed tray 72 Paper feed conveyor 721, 722 Paper feed roller 723 Paper feed conveyor belt 81 Storage Tray 82 Accumulation conveying section 821, 822, 823 Accumulation transport rollers 824 Accumulation conveyor belt P1: Recording material (when the first main surface S1 is printed) P2 Recording material (when the second main surface S2 is printed) P3 Printed material

Claims

1. A recording system using an inkjet recording method, a pre-processing section for pre-processing a recording medium; A detection unit for detecting a value of a factor related to the deformability of the recording medium; A control unit that controls the pre-processing unit; a recording unit that prints on the recording medium that has been pretreated by an inkjet recording method, The pre-processing section includes a dry processing section that performs dry processing on the recording medium, and a pre-coating section that performs pre-coating processing on the recording medium using a pre-coating liquid, the control unit controls the intensity of the dry process and the pre-coat process in response to a detection result from the detection unit; the recording medium has a first main surface and a second main surface opposite to the first main surface, Further, a reversing unit is provided to reverse the first main surface and the second main surface of the recording medium so that printing is performed in that order on the first main surface and the second main surface during double-sided printing, The recording system, wherein the control unit controls the detection unit so that the detection unit operates only when the printing is performed on the second main surface.

2. 2. The recording system according to claim 1, wherein the factor relating to the deformability includes a printing amount on the first main surface.

3. 3. The recording system according to claim 1, wherein the factor relating to the deformability includes a rigidity of the recording medium.

4. 4. The recording system according to claim 1, wherein the factors relating to the deformability include an environmental temperature and an environmental relative humidity.

5. 5. The recording system according to claim 1, wherein the factor relating to the deformability includes a moisture content of the recording material immediately before the pre-treatment.

6. 6. The recording system according to claim 1, wherein the factor relating to the deformability includes a maximum curl amount of the recording medium immediately before pre-processing.

7. A recording method by an inkjet recording system, comprising: A pre-processing step of pre-processing a recording material; A detection step of detecting a value related to the deformability of the recording material; A control step for controlling the pretreatment step; a recording step of printing on the pre-treated recording material by an inkjet recording method, the pre-treatment step includes a dry treatment step of dry-treating the recording medium or a pre-coat step of pre-coating the recording medium with a pre-coat liquid, the control step controls the intensity of the dry treatment or the pre-coat treatment in accordance with the detection result in the detection step; A recording method characterized in that, during double-sided printing, the recorded object has a first main surface and a second main surface opposite the first main surface, the recording process prints on the first main surface and the second main surface in that order, and includes an inversion process of inverting the first main surface and the second main surface to print on the first main surface and the second main surface in that order, and the control process controls the detection process so that the detection process operates only when the printing is performed on the second main surface.

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