JP6612666B2 - Inkjet recording method - Google Patents

Description

  The present invention relates to an ink jet recording method for performing ink jet recording using a non-aqueous ink on an adhesive surface of a pre-glue pressure-sensitive adhesive sheet used for a pressure-bonding postcard or the like.

  Compared with a normal postcard, the pressure-bonded postcard has a larger information recording surface, so that the amount of information can be increased. Further, since the information recording surface is pressure-bonded, confidentiality can be ensured. Furthermore, since it is a postcard, there is a merit that shipping charges such as postage can be made cheaper than sealed letters. For this reason, crimped postcards are used for highly confidential notices in which personal information is recorded, direct mails, and the like.

  As the pressure-bonding postcard, for example, a pressure-sensitive adhesive sheet coated with a pseudo pressure-sensitive adhesive composition is used (for example, see Patent Document 1). This pressure-sensitive adhesive sheet is used by printing on the coated surface (adhesive surface) of the pseudo-pressure-sensitive adhesive composition, folding the coated surface inside, pressing and adhering, and then peeling the adhesive surface. This makes it possible to confirm the printed content of the coated surface. Such a pressure-sensitive adhesive sheet is called a pre-adhesive pressure-sensitive adhesive sheet, and a pseudo-pressure-sensitive adhesive composition containing natural rubber latex, a modified product thereof, synthetic rubber latex, synthetic resin, etc. is coated on both sides. Is done.

  There are two types of crimped postcards, one called a six-sided postcard that turns both sides together and another called a four-sided postcard that turns only one side. The pre-glue pressure-sensitive adhesive sheet is folded into a letter Z shape after printing and is pressure-bonded in both cases of a 6-sided postcard and a 4-sided postcard. Therefore, the pressure-sensitive adhesive sheet with a pre-glue type before press-bonding has three sides of the size corresponding to the postcard size on each side of the paper.

  The number of surfaces that can be used as the information printing surface is different between the 6-sided postcard and the 4-sided postcard. In a 6-sided postcard, all 3 sides of the front and back are exposed by turning both sides together, so all 6 sides are used as information printing sides.

  On the other hand, a four-sided postcard is premised on turning only one side. For this reason, by turning only one side, three surfaces on the front side including the surface on which the address is printed and one surface on the back side serving as the back surface in the crimping postcard are exposed. Therefore, these four surfaces are used as information printing surfaces. The remaining two sides on the back side of the paper are presupposed to be hidden inside without being turned, and are not used as information printing surfaces, but are used exclusively as concealment printing surfaces for printing concealment patterns.

  Note that the concealment printing is a blind print for preventing the printed content of the information printing surface arranged inside the crimping postcard from being seen through from the outside by crimping.

  In this way, there are six postcards and four postcards in the crimping postcard, and variable information that is different for each destination including the address is printed exclusively on the information printing surface. For this reason, a four-sided postcard is often used from the viewpoint of processing speed and printing cost.

  By the way, printing on the pre-adhesive pressure-sensitive adhesive sheet is usually performed by performing regular printing on the front surface and concealment printing on the back surface with an offset printing machine, and variable surface printing with an electrophotographic printer. Yes. The reason for using offset printing and electrophotographic printers is that when the surface printing and concealment printing are performed with an electrophotographic printer, the pressure sensitive adhesive sheet is damaged by the toner fixing heater. This is because adhesion cannot be performed due to a decrease in adhesive force, or curling after printing becomes large, and pressure bonding cannot be performed.

  On the other hand, in recent years, since inkjet printers have become widespread, printing by an inkjet method that does not receive much thermal damage can be applied to a pressure-sensitive adhesive sheet coated with a pseudo-pressure-sensitive adhesive composition. Is desired.

Japanese Patent No. 3075426

  However, when printing on a pre-adhesive pressure-sensitive adhesive sheet with water-based ink used for inkjet printing, the adhesive-adhesive pressure-sensitive adhesive sheet removes the aqueous solvent of the ink when concealing printing with a high printing rate is performed on the back side. It has been found that it cannot be properly crimped when absorbed and corrugated and crimped after printing.

  In addition, a four-sided postcard that presupposes that only one side is to be flipped has a stronger adhesive strength than the front side against the back side of the pre-adhesive pressure-sensitive adhesive sheet on which the two sides that are kept crimped without being turned are placed. Is required. However, changing the pseudo-pressure-sensitive adhesive composition in order to increase the adhesive strength than that applied to the surface of the pseudo-pressure-sensitive adhesive composition applied to the back side of the pre-adhesive pressure-sensitive adhesive sheet Not realistic from a cost perspective.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to reduce paper deformation even when a concealed image having a high printing rate is printed on a pre-adhesive pressure-sensitive adhesive sheet. It is an object of the present invention to provide an ink jet recording method capable of increasing the adhesive force of an adhesive surface on which a concealment image is printed as compared with an adhesive surface on which an information image is printed.

In order to achieve the above object, an ink jet recording method according to the first aspect of the present invention comprises:
A pressure-sensitive adhesive composition containing a rubber component is applied, and two sets of pressure-bonding portions formed by bending in a Z-shape with a bent portion as a boundary, the two bonding surfaces facing each other are pressed together. An ink jet recording method for performing ink jet recording using a non-aqueous ink on the adhesive surface of a pre-adhesive pressure-sensitive adhesive sheet that can be bonded to each other to form a pressure-bonded postcard,
An information image printing step of printing an information image to be visually recognized after re-peeling on one of the two sets of pressure-bonding portions so that the two bonding surfaces are removably bonded to each other.
The concealed image for concealing the information image in a state where the crimping postcard is configured in the other set of the crimping portions of the two sets of crimping portions, at least with a higher printing rate than the information image, the adhesive surface A concealed image printing process for printing on
including.

  The ink jet recording method according to the second aspect of the present invention is the ink jet recording method according to the first aspect of the present invention, wherein, in the concealed image printing step, of the two adhesive surfaces in the other set of crimping portions. The concealment image is printed at least on the adhesive surface that is in a positional relationship between the adhesive surface and the front and back surfaces of the one set of crimping portions.

  According to the present invention, even when a concealed image having a high printing rate is printed on the pre-adhesive pressure-sensitive adhesive sheet, there is less deformation of the paper, and the concealed image is more than the adhesive surface on which the information image to be re-separated and printed is printed. It is possible to increase the adhesive force of the adhesive surface on which is printed.

  In other words, the adhesive type pressure-sensitive adhesive sheet that can be formed into a pressure-bonded postcard by bending and crimping in a Z shape has two adhesive surfaces on the front side and the back side of the adhesive type pressure-sensitive adhesive sheet, respectively. One set of pressure-bonding portions that can be bonded by pressure bonding is generated.

  One of the crimping parts is premised on being peeled off again at the recipient of the crimping postcard in order to visually recognize the information image printed on the adhesive surface. In addition, since the concealed image for concealing the information image is printed on the adhesive surface so that the other crimping part is not seen in the state of the crimping postcard, it is premised that the other crimping part will not be peeled off again at the recipient of the crimping postcard.

  Here, in the ink jet recording method according to the first aspect of the present invention, when ink jet recording was performed using a non-aqueous ink on the adhesive surface of each crimping portion, the adhesive surface of the pre-glue pressure-sensitive adhesive sheet was applied. The adhesive force of the pressure-sensitive adhesive composition containing the rubber component is increased. This is presumably because the rubber component of the pressure-sensitive adhesive composition is swollen by the non-aqueous solvent in the non-aqueous ink, and the rubber component comes out more on the surface layer of the pressure-sensitive coating layer.

  Therefore, in the ink jet recording method according to the first aspect of the present invention, the information image is applied to at least one of the two bonding surfaces of the other crimping portion, which is premised on not being peeled again at the recipient of the crimping postcard. When the concealed image having a high printing rate is printed, the adhesive force of the pressure-sensitive adhesive composition on the adhesive surface is the pressure-sensitive adhesive composition on the adhesive surface of one pressure-bonding portion on which information printing with a low printing rate is performed. Stronger than adhesive strength. For this reason, it is possible to make it difficult for the adhesive surfaces to be separated from each other in the other crimping part than in the one crimping part.

  In addition, the non-aqueous solvent of the non-aqueous ink, unlike the water-soluble solvent of the water-based ink, does not cockle when printed on the pre-adhesive pressure-sensitive adhesive sheet, so that it can be properly pressed without wrinkles.

  Therefore, even when a concealed image with a high printing rate is printed on the pre-adhesive pressure-sensitive adhesive sheet, there is less deformation of the paper, and moreover, the adhesive image on which the concealed image is printed than the adhesive surface on which the information image to be re-separated is printed The adhesive strength of the surface can be increased.

  Further, according to the ink jet recording method according to the second aspect of the present invention, in the ink jet recording method according to the first aspect of the present invention, when the pressure-bonding postcard is configured by bonding the bonding surfaces of the pressure-bonding portions by pressure bonding. In addition, the concealed image printed on the adhesive surface of the other crimping part is arranged behind the information image printed on the adhesive surface of one crimping part. For this reason, it is possible to reliably hide the information image with the concealment image so that the information image cannot be seen through from the outside in the state of the crimped postcard.

1 is a block diagram illustrating a configuration of a printing system used for carrying out an inkjet recording method according to an embodiment of the present invention. FIG. 2 is an explanatory diagram illustrating a schematic configuration of a paper feeding unit, a belt conveyance unit, and an inkjet head of the printing apparatus of FIG. 1. (A)-(c) is explanatory drawing which shows each state at the time of the surface side before the crimping | compression-bonding of the crimping | compression-bonding paper crimped by the post-processing apparatus of FIG. (A) is a principal part expanded sectional view which shows the state of the crimping | compression-bonding surface after the crimping process of the crimping | compression-bonding paper of FIG. 3, (b) is principal part sectional drawing which expanded a part of (a) further. (A) is explanatory drawing which shows the surface side of the crimping postcard after the crimping process of the crimping | compression-bonding paper of FIG. 3, (b) is explanatory drawing which similarly shows the back surface side. It is explanatory drawing which shows the procedure at the time of unfolding | folding the crimping postcard of FIG. (A) is explanatory drawing which shows the surface side in the expansion | deployment state of the crimping | compression-bonding postcard of FIG. 6, (b) is explanatory drawing which similarly shows the back surface side. 2 is a flowchart illustrating an example of a procedure of an inkjet recording method according to an embodiment of the present invention performed in the printing apparatus of FIG. 1.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Throughout the drawings, the same or equivalent parts and components are denoted by the same or equivalent reference numerals. However, it should be noted that the drawings are schematic and different from the actual ones. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

  Further, the embodiment described below exemplifies an apparatus or the like for embodying the technical idea of the present invention, and the technical idea of the present invention is to arrange the components and the like as follows. Not specific. The technical idea of the present invention can be variously modified within the scope of the claims.

  FIG. 1 is a block diagram illustrating a configuration of a printing system according to an embodiment of the present invention. FIG. 2 is an explanatory diagram illustrating a schematic configuration of a paper feeding unit, a belt conveyance unit, and an inkjet head of the image forming apparatus illustrated in FIG. . In the following description, the direction orthogonal to the paper surface of FIG. 2 is the front-rear direction, and the front surface direction is the front. Further, as shown in FIG. 2, when viewed from the front, the top, bottom, left, and right are the top, bottom, left, and right directions.

  As shown in FIG. 1, the printing system 1 includes an image processing device 2, an inkjet printing device 3, and a post-processing device 4 that performs post-processing on paper after printing in the printing device 3.

  The image processing apparatus 2 generates print data used for printing in the printing apparatus 3, and performs this on the post-processing apparatus 4 for the type and print settings of the paper used for printing in the printing apparatus 3 and the printed paper. Along with setting data indicating the contents of post-processing and the like, it is output to the printing apparatus 3 as a print job. The image processing apparatus 2 includes a print data generation unit 11, a storage unit 12, an input unit 13, a display unit 14, and a communication unit 15.

  The image processing apparatus 2 includes a personal computer having a storage device such as a CPU, RAM, ROM, and hard disk. The function of the print data generation unit 11 is realized by the CPU executing the printer driver program.

  The print data generation unit 11 generates print data in drop data format based on image data to be printed in RGB format. The image data to be printed is, for example, image data generated by an application (not shown). The drop data is data indicating the number of ink drops (ink amount) for each color pixel in printing by the printing apparatus 3.

  The storage unit 12 is realized by a storage device such as a hard disk. The storage unit 12 stores the above-described printer driver program and the like. The input unit 13 includes a keyboard and a mouse. The input unit 13 receives various instructions and information input operations by the user.

  The display unit 14 is realized by a liquid crystal display device, for example. The display unit 14 displays various screens such as a print setting screen. The communication unit 15 is realized by a communication control device that connects the image processing apparatus 2 to a network 17 such as a LAN. The communication unit 15 connects the image processing apparatus 2 to the network 17. Thereby, the image processing apparatus 2 can communicate with the printing apparatus 3.

  The printing apparatus 3 is an ink jet printing apparatus, and prints an image by ejecting ink onto the paper P based on print data from the image processing apparatus 2. Note that a pseudo-pressure-sensitive adhesive composition G (see FIG. 4A), which will be described later, is applied to both sides of the paper P. The printing apparatus 3 includes a paper feed unit 21, a belt conveyance unit 22, inkjet heads 23 </ b> K, 23 </ b> C, 23 </ b> M, and 23 </ b> Y, a head drive unit 24, a communication unit 25, and a control unit 26.

  Note that the path indicated by the thick line in FIG. 2 is a transport path for transporting a sheet as a print medium. Among the transport routes, the route indicated by the solid line is the paper feed route RS, and the route indicated by the broken line is the print route RC. In the following description, upstream and downstream mean upstream and downstream in the transport path.

  The paper feeding unit 21 feeds the paper P. As shown in FIG. 2, the paper feed unit 21 includes an external paper feed stand 31, an external paper feed roller 32, a plurality of internal paper feed stands 33, a plurality of internal paper feed rollers 34, and a plurality of vertical transport rollers. 35 and a registration roller 36.

  The external paper feed tray 31 is used to load paper P used for printing. The external paper feed tray 31 is partly exposed outside the casing (not shown) of the printing apparatus 3.

  The external paper feed roller 32 picks up the paper P from the external paper feed tray 31 one by one and sends it out to the registration roller 36. The external paper feed roller 32 is disposed on the upper side of the external paper feed base 31. The external paper feed roller 32 is driven by a motor (not shown).

  The internal paper feed tray 33 is for loading paper P used for printing. The internal paper feed tray 33 is disposed inside the casing of the printing apparatus 3.

  The internal paper feed roller 34 picks up the paper P one by one from the internal paper feed tray 33 and sends it out to the paper feed path RS. The internal paper feed roller 34 is provided above the internal paper feed tray 33. The internal paper feed roller 34 is driven by a motor (not shown).

  The vertical conveyance roller 35 conveys the paper P taken out from the internal paper feed tray 33 to the registration roller 36. The vertical conveyance roller 35 is disposed along the paper feed path RS. The most downstream vertical conveying roller 35 is driven by the same motor as the external paper feeding roller 32. The other vertical transport rollers 35 are driven by the same motor as the internal paper feed roller 34.

  The registration roller 36 temporarily stops the paper P conveyed from the external paper feed tray 31 or the internal paper feed tray 33 and then sends it to the belt transport unit 22. The registration roller 36 is disposed upstream of the printing path RC. The registration roller 36 is driven by a motor (not shown).

  The belt conveyance unit 22 adsorbs and holds the paper P conveyed from the paper supply unit 21 on the belt and conveys it. The roller on which the belt of the belt conveyance unit 22 is wound is driven by a motor (not shown), so that the belt rotates and the paper P on the belt is conveyed.

  The inkjet heads 23K, 23C, 23M, and 23Y print an image by ejecting ink onto the paper P that is transported by the belt transport unit 22. The inkjet heads 23K, 23C, 23M, and 23Y are line-type inkjet heads in which a plurality of nozzles are arranged in a direction (front-rear direction) that is substantially orthogonal to the transport direction of the paper P. The inkjet heads 23K, 23C, 23M, and 23Y eject inks of K (black), C (cyan), M (magenta), and Y (yellow) from the nozzles, respectively.

  The ink ejected by the inkjet heads 23K, 23C, 23M, and 23Y may be, for example, a water-based ink in which a pigment is dispersed in a base medium, or an oil-based ink in which a pigment is dispersed in a water-insoluble solvent. But you can.

  As shown in FIG. 2, the inkjet heads 23 </ b> K, 23 </ b> C, 23 </ b> M, and 23 </ b> Y are arranged in parallel in the left-right direction above the belt conveyance unit 22. In the present embodiment, the alphabetic suffixes (C, K, M, Y) indicating colors may be omitted in the case where it is not necessary to distinguish colors.

  The inkjet head 23 can change the number of drops of ink ejected from one nozzle to one pixel, and performs printing that expresses the density based on the number of drops. In the present embodiment, the inkjet head 23 can control the number of drops in eight stages of 0 to 7 drops.

  The head driving unit 24 drives the inkjet head 23 to discharge ink from the nozzles. The communication unit 25 connects the printing apparatus 3 to the network 17. Thereby, the printing apparatus 3 can communicate with the image processing apparatus 2.

  The control unit 26 controls the operation of the entire printing apparatus 3. In addition, the control unit 26 notifies the post-processing device 4 of the content of the post-processing indicated by the setting data in the print job from the image processing device 2. In addition, when the sheet used for printing indicated by the setting data is a pressure-bonded sheet, the control unit 26 performs correction processing on the print data in the print job as necessary. The control unit 26 that performs these processes includes a CPU, a RAM, a ROM, a hard disk, and the like.

  When the post-processing device 4 receives a notification from the control unit 26 of the printing device 3 that the setting processing in the print job includes that the pressure-bonding processing is performed on the pressure-bonded paper, the post-processing device 4 operates the device (not shown). The cutting process and the crimping process are performed.

  In the cutting process, the paper P having a size that can be stacked on the external paper feed tray 31 or the internal paper feed tray 33 of the printing apparatus 3 is cut into the size of the pressure-sensitive adhesive sheet PP shown in FIGS. To do. This pressure-sensitive adhesive sheet PP (corresponding to the pre-adhesive pressure-sensitive adhesive sheet in the claims) is formed by a post-bonding process at a later stage, and a four-side postcard-type pressure-bonded postcard PC (see FIGS. 5A and 5B). ). A corner cut portion CC13 is formed on the surface F13 (surface R13) of the pressure-sensitive adhesive sheet PP after the cutting process. The corner cut portion CC13 will be described later.

  In addition, the front and back surfaces of the pressure-sensitive adhesive sheet PP after the cutting process are divided into three surfaces F11 to F13 and R11 to R13, respectively, with the bent portions P11 and P12 bent in the subsequent crimping process as boundaries. Each of the surfaces F11 to F13 and R11 to R13 has a size that matches the postcard size.

  And among each surface F11-F13 of the surface of the pressure sensitive adhesive sheet PP shown to Fig.3 (a), as shown in FIG.3 (c) in a crimping | compression-bonding process, it is folded outward from the bending location P11, and a crimping postcard As shown in FIG. 3A, a variable information image VA11 such as an address is printed on the surface F11 exposed on the surface of the PC (see FIG. 5A).

  Variable information images VA12 and VA13 such as information notified to the addressee recipient by the crimping postcard PC are respectively printed on the remaining two surfaces F12 and F13 of the pressure-sensitive adhesive sheet PP. As shown in FIG. 3C, the surfaces F12 and F13 are crimped by being bent inward so as to overlap each other from the bent portion P12.

  Moreover, among the respective surfaces R11 to R13 on the back surface of the pressure-sensitive adhesive sheet PP shown in FIG. 3B, the back surface of the pressure-bonded postcard PC that is bent outward from the bent portion P12 in the pressure-bonding process (FIG. 5B). As shown in FIG. 3B, the concealed image MS13 as a blindfold for preventing the variable information images VA12 and VA13 of the crimped surfaces F12 and F13 from being seen through from the outside is provided on the surface R13 exposed in the reference). Is printed.

  A concealment image MS12 as a blindfold is also printed on at least one of the two remaining surfaces R11, R12 on the back surface of the pressure-sensitive adhesive sheet PP (only the surface R12 in the example shown in FIG. 3B). In the example shown in FIG. 3B, no image is printed on the surface R11. The surfaces R11 and R12 are crimped by being bent inward so as to overlap each other from the bent portion P11 in the crimping process. In the concealed image printing step in the claims, the concealed image printed on the adhesive surface of the other set of crimping portions indicates the concealed image MS12 printed on the surface R1.

  In the pressure-bonding process, the post-processing device 4 folds the pressure-sensitive adhesive sheet PP after printing by the printing device 3, for example, at the boundary between the surfaces F11 to F13 and R11 to R13 as shown in FIG. It is folded in three (Z-fold) at the curved portions P11 and P12, and the entire pressure-sensitive adhesive sheet PP is pressed with a pressure roller or the like.

  As described above, the pseudo-pressure-sensitive adhesive composition G (see FIG. 4A) is applied to the front and back surfaces of the pressure-sensitive adhesive sheet PP from the stage of the paper P before the cutting process. ing. Accordingly, the pressure-sensitive adhesive sheet PP folded in a three-fold (Z-fold) shape is subjected to pressure treatment, so that the surface F12 and the surface F12 of the pressure-sensitive adhesive sheet PP are obtained by the adhesive force of the pseudo pressure-sensitive adhesive composition G. F13 is pressure-bonded, and the back surface R11 and the surface R12 of the pressure-sensitive adhesive sheet PP are pressure-bonded.

  As shown in the explanatory diagrams of FIGS. 5A and 5B, the pressure-sensitive adhesive sheet PP folded and pressed into a three-fold (Z-fold) shape by this pressure-bonding process has a variable information image VA11 such as an address as shown in FIG. The printed postcard PC has the printed surface F11 as a front surface and the surface R13 on which the concealed image MS13 is printed as a back surface.

  As shown in FIG. 5B, a corner cut portion CC13 formed on the surface R13 is disposed on the back surface of the crimping postcard PC, and a part of the surface F12 that is crimped to the surface F13 passes through the corner cut portion CC13. Exposed. Thereby, compliance with the laws and regulations imposed on the crimping postcard PC is achieved.

  As shown in the explanatory diagram of FIG. 6, the crimping postcard PC turns the surface R13 using the corner cut portion CC13 and peels the crimped surfaces F12 and F13 into the explanatory diagram of FIG. As shown, the variable information images VA12 and VA13 are developed in a visible state.

  In this state, the other pair of pressure-bonded surfaces R11 and R12 are in a pressure-bonded state as they are, and the opposite side of the peeled surfaces F12 and F13 is an address or the like as shown in the explanatory view of FIG. The surface F11 on which the variable image VA11 is printed and the surface R13 on which the concealment image MS13 is printed are arranged side by side.

  By the way, as shown to Fig.4 (a), the surface F12 and the surface F13 which are crimped | bonded by the crimping process of the post-processing apparatus 4, the surface R11, and the surface R12 are coated on the whole surface and back surface of the pressure sensitive adhesive sheet PP. Each of them is covered with the simulated pressure-sensitive adhesive composition G. This pseudo-pressure-sensitive adhesive composition G exhibits an adhesive force when pressurized, and the pseudo-pressure-sensitive adhesive composition G includes natural rubber latex, a modified product thereof, synthetic rubber latex, synthetic resin, and the like. It is blended.

  When a non-aqueous ink in which a pigment is dispersed in a non-aqueous solvent such as a non-volatile solvent is used for printing the variable information images VA11 to VA13 and the concealed images MS12 and MS13 by the printing apparatus 3, a pseudo pressure sensitive adhesive is used. The adhesive force of the composition G becomes strong.

  The cause is that, as shown in FIG. 4 (b), the rubber component g in the pseudo-pressure-sensitive adhesive composition G applied to the surfaces R11, R12 (surfaces F12, F13) of the pressure-sensitive adhesive sheet PP is The swelling is caused by the non-aqueous solvent in the non-aqueous ink I used for printing, and the swollen rubber component g comes out from the surface layers of the surfaces R11 and R12 (surfaces F12 and F13), thereby strengthening the adhesive force. Inferred.

  Therefore, in particular, a concealed image with a high printing rate is provided on at least one of the surfaces R11 and R12 (only the surface R12 in the example shown in FIG. 3B) that is assumed to remain pressed without being turned. By printing MS12, the adhesive force of the pseudo pressure-sensitive adhesive composition G on the surface can be increased, and the pressure-bonded surfaces R11 and R12 can be made difficult to peel off.

  Further, unlike the water-soluble solvent of the water-based ink, the non-water-based solvent of the non-water-based ink I does not cock when printed on the pressure-sensitive adhesive sheet PP, so that it can be properly pressed without wrinkles.

  Note that the surfaces F12 and F13 of the pressure-sensitive adhesive sheet PP on which the variable information images VA12 and VA13 are printed and pressed are non-aqueous because the printing rate of the variable information images VA12 and VA13 is lower than the printing rate of the hidden image MS12. By printing the variable information images VA12 and VA13 using the ink I, the degree to which the adhesive force of the pseudo pressure-sensitive adhesive composition G becomes strong is small. For this reason, the non-aqueous ink I does not strengthen the adhesive force of the pseudo pressure-sensitive adhesive composition G to such an extent that the pressed surfaces F12 and F13 are more difficult to peel off than necessary.

  The non-aqueous ink I is used to print the concealed image MS12 having a high printing rate on the surface R12 of the pressure-sensitive adhesive sheet PP, which is assumed to remain pressed without being turned on the receiving side of the pressure-bonding postcard PC described above. In doing so, the printing apparatus 3 performs the printing process of the variable information images VA11 to VA13 and the concealment images MS12 and MS13 according to the procedure shown in the flowchart of FIG.

  That is, in the information image printing process of step S1, the two surfaces F12 of the surface of the paper P to be crimped by bending from the folding part P12 of the pressure-sensitive adhesive sheet PP by the cutting process and the pressure-bonding process of the post-processing device 4. The variable information images VA12 and VA13 are printed in the portion that becomes F13. At this time, even if the variable information image VA11 is simultaneously printed on the surface F11 of the surface of the same pressure-sensitive adhesive sheet PP that is exposed to the surface of the pressure-bonding postcard PC without being pressure-bonded to the other surface after the pressure-bonding process. Good.

  Further, in the concealed image printing process in step S3, two surfaces R11, R11, on the back side of the paper P, which are bent and pressed from the bent portion P11 of the pressure-sensitive adhesive sheet PP by the cutting process and the pressing process of the post-processing device 4. The concealed image MS12 is printed on the portion of R12 that becomes the surface R12. At this time, the concealment image MS13 may be simultaneously printed on the portion which becomes the rear surface R13 of the same pressure-sensitive adhesive sheet PP, which is exposed to the rear surface side of the pressure-bonding postcard PC without being pressure-bonded to the other surface after the pressure-bonding process. .

  That is, the two surfaces F12 and F13 of the surface of the pressure-sensitive adhesive sheet PP which is printed from the bent portion P12 and printed with the variable information images VA12 and VA13 in the information image printing process of step S1 It corresponds to the two bonding surfaces of one set of crimping portions.

  Further, the back surface R12 of the pressure-sensitive adhesive sheet PP, which is printed from the concealed image MS12 in the step S3 and is folded and pressed from the bent portion P11, and the surface R11 to be pressed against the surface R12 are provided. This corresponds to the two bonding surfaces of the other set of crimping portions in the claims.

  Further, the surface R12 on which the concealed image MS12 is printed, which is in a positional relationship with the surface F12 on which the variable information image VA12 is printed, is at least one of the two bonding surfaces in the other set of crimping portions in the claims. This corresponds to an adhesive surface having a positional relationship between the adhesive surface on which the information image is printed and the front and back surfaces in the crimping portion of the set.

  In executing the ink jet recording method of the present invention, one of the information image printing process in step S1 and the concealed image printing process in step S3 shown in the flowchart of FIG. 8 may be performed before the other. You may do it at the same time. That is, the setup of each process may be determined according to the function of the printing apparatus 3 and the like.

  As described above, according to the inkjet recording method of the present embodiment, the pressure-sensitive adhesive sheet PP that is a four-sided postcard type pressure-bonded postcard PC is pressed without being turned on the receiving side of the pressure-bonded postcard PC. The concealed image MS12 having a high printing rate was printed with the non-aqueous ink I on the surface R12 out of the surfaces R11 and R12 that are assumed to remain.

  For this reason, the non-aqueous ink I using a non-aqueous solvent that is not easily absorbed by the pressure-sensitive adhesive sheet PP is adhered to the pseudo pressure-sensitive adhesive composition G on the surface R12 at a high printing rate, which causes cockling. The pressure-sensitive adhesive sheet PP does not cause absorption of the solvent, and the adhesive force of the pseudo-pressure-sensitive adhesive composition G is increased by swelling of the rubber component g of the pseudo-pressure-sensitive adhesive composition G. R11 and R12 can be made difficult to peel off.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment.

  Furthermore, in the above-described embodiment, the concealed image MS12 having a high printing rate is not applied to the surface R12 of the pressure-sensitive adhesive sheet PP on the assumption that the pressure-bonding postcard PC is not turned on the receiving side. Printed with aqueous ink I. However, the surface on which the concealed image having a high printing rate is printed with the non-aqueous ink I may be the surface R11 to be pressure-bonded to the surface R12, or may be both surfaces R11 and R12.

DESCRIPTION OF SYMBOLS 1 Printing system 2 Image processing apparatus 3 Printing apparatus 4 Post-processing apparatus 11 Print data generation part 12 Storage part 13 Input part 14 Display part 15 Communication part 17 Network 21 Paper feed part 22 Belt conveyance part 23,23K, 23C, 23M, 23Y Inkjet head 24 Head drive unit 25 Communication unit 26 Control unit 31 External sheet feed table 32 External sheet feed roller 33 Internal sheet feed table 34 Internal sheet feed roller 35 Vertical transport roller 36 Registration roller CC13 Corner cut unit F11 Pressure-sensitive adhesive sheet surface Side surface F12, F13 Surface side surface of pressure-sensitive adhesive sheet (two adhesive surfaces of one set of crimping parts)
G Pseudo-pressure-sensitive adhesive composition g Rubber component I Non-aqueous ink MS12 Concealed image (concealed image printed on the adhesive surface of the other set of crimping parts)
MS13 Concealed image P Paper P11, P12 Bending point PC Crimp postcard PP Pressure sensitive adhesive sheet (Paste type pressure sensitive adhesive sheet)
R11 Pressure-sensitive adhesive sheet on the back side (two adhesive surfaces of the other set of crimping parts)
R12 The surface on the back side of the pressure-sensitive adhesive sheet (the two adhesive surfaces of the other set of crimping portions, the adhesive surface in which the information image is printed on the one set of crimping portions and the adhesive surface in a positional relationship between the front and back sides)
R13 Surface on the back side of the pressure-sensitive adhesive sheet RC printing path RS paper feeding path VA11 variable image VA12, VA13 variable image (information image printed on at least one bonding surface of one set of crimping portions)

Claims (2)

A pressure-sensitive adhesive composition containing a rubber component is applied, and two sets of pressure-bonding portions that are formed by bending in a Z-shape with the bent portion as a boundary are bonded to each other by pressing the two bonding surfaces facing each other. An ink jet recording method for performing ink jet recording using a non-aqueous ink on the adhesive surface of a pre-adhesive pressure-sensitive adhesive sheet that can be bonded to each other to form a pressure-bonded postcard,
An information image printing step of printing an information image to be visually recognized after re-peeling in one set of pressure-bonding portions that removably bond the two bonding surfaces among the two sets of pressure-bonding portions;
In the other of the two sets of the crimping portions, in the other set of the crimping portions, the concealment image for concealing the information image in a state in which the crimping postcard is configured, at least with a higher printing rate than the information image, the adhesive surface A concealed image printing process for printing on
An inkjet recording method comprising:   In the concealed image printing step, at least one of the two bonding surfaces in the other set of crimping portions is bonded in a positional relationship between the bonding surface on which the information image is printed in the one set of crimping portions and the front and back surfaces. The inkjet recording method according to claim 1, wherein the concealed image is printed on a surface.