JP2012126060A - Nozzle and dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dryer reducing the residual amount of a volatile organic solvent in an ink composition or an adhesive while maintaining a current speed of print processing or the like of a sheet material with the ink composition or the adhesive applied (printed) on its surface, and a nozzle included in the dryer.SOLUTION: The nozzle (a lower nozzle 10) sprays a dry gas drying the ink composition or the adhesive applied onto the banded sheet material S toward the sheet material S while the sheet material S is travelling. The lower nozzle 10 includes a cylindrical nozzle body through which the dry gas passes, an inflow port formed on the proximal end side of the nozzle body to make the dry gas flow into it, and an ejection port formed on the leading end side of the nozzle body to eject the dry gas. The inflow port and the ejection port have opening forms elongated in a width direction of the sheet material S, the opening area of the ejection port is larger than the opening area of the inflow port, and a space between opposing inner wall surfaces of the nozzle body spreads out uniformly or in a trumpet form from the inflow port toward the ejection port.

Description

  The present invention relates to a drying device for drying a sheet material on which an ink composition or an adhesive is applied (printed), and a nozzle provided in the drying device.

  A gravure printing machine, etc., has a configuration in which a paper feeder and a drying device are attached to the printing main body, and performs printing using an ink composition containing an organic solvent such as toluene on a sheet material such as paper or plastic film. Is common. The drying device guides a long sheet material from the printing body to a drying chamber by a guide such as a roller, volatilizes the solvent using a drying gas, and quickly dries the ink composition immediately after printing. Yes. Usually, air is used as the drying gas, and the air is introduced into the drying chamber and discharged to the outside by a blower and a duct. Moreover, in order to make the volatilization of a solvent efficient, drying gas is sprayed on the surface of a sheet | seat material from a nozzle, or drying gas is heated using a heater.

  By the way, in recent years, in order to preserve the natural environment, emission regulations of volatile organic solvents (commonly referred to as VOC) contained in the ink composition have been strengthened. Furthermore, from the viewpoint of saving resources and maintaining the working environment, the solvent is recovered or processed by some method. For example, Patent Document 1 can reduce the total volume of solvent-containing gas released to the atmosphere by circulating and reusing a solvent-containing gas once used for drying and containing a low concentration of solvent. A drying apparatus is disclosed.

  As shown in FIG. 5, the drying device 60 described in Patent Document 1 is disposed from the central part to the upper part of the printing press 90, and the printing main body part 91 is disposed at the lower part. The long sheet material S is supplied from the right side of the center height in the drawing of the printing machine 90 and is printed while passing through the lower printing main body 91 by the guide roller, and then guided to the upper drying device 60. After passing through the drying device 60 from the bottom to the top, it is delivered to the upper right side.

  The drying device 60 includes a lower drying chamber 70, an upper drying chamber 80, a lower pressurizing duct 71, an upper pressurizing duct 81, a lower suction duct 72, an upper suction duct 82, and a blower and a heater (not shown). . Five nozzles 73 are provided in the lower drying chamber 70, and four nozzles 83 are provided in the upper drying chamber 80.

  The drying gas supplied from the lower pressurizing duct 71 into the lower drying chamber 70 is jetted from the tip of the nozzle 73 in the lower drying chamber 70 toward the surface of the sheet material S, and then passes through the lower suction duct 72. Is sent to an exhaust gas treatment section (not shown), and after the solvent concentration is reduced below a specified value, it is released into the atmosphere. Similarly, the drying gas supplied into the upper drying chamber 80 is ejected from the nozzle 83 in the upper drying chamber 80 and then sucked by the upper suction duct 82. Here, since the solvent-containing gas sucked by the upper suction duct 82 has a low solvent concentration, a part of the solvent-containing gas is reused as the drying gas sent to the lower drying chamber 70.

  Each of the plurality of nozzles 73 and 83 has a cylindrical shape that protrudes in the direction in which the dry gas is blown out and the opening area of the injection port at the tip is narrowed down. The opening shape of the injection ports of the nozzles 73 and 83 has a long slit shape in the width direction of the sheet material S. The opening width of the injection port is generally constant in the longitudinal direction of the injection port. For example, as disclosed in Patent Document 2, the opening width in the vicinity of the center portion in the longitudinal direction of the injection port is set near the both ends. By making it wider than the opening width, the effect of drying the ink composition uniformly over the entire width of the sheet material S can be further enhanced.

JP 2007-192528 A JP 2001-301122 A

  As a regulation of the volatile organic solvent contained in the ink composition, there is a residual regulation in addition to the above emission regulation. For example, when a sheet material on which an ink composition is printed is used as a food packaging material, strict residual regulations are imposed on volatile organic solvents remaining in the packaging material from the viewpoint of food packaging safety and hygiene. In addition, food packaging material manufacturers have a high level of demand from food manufacturers for odors in packaging materials, and are currently struggling with consumer complaints regarding packaging material odors and product processing security issues. . From such a background, there is a demand for a drying method that can reduce the residual amount of volatile organic solvent in the sheet material while maintaining the current speed of the sheet material printing and the like.

  Since the nozzles 73 and 83 provided in the conventional drying device 60 shown in FIG. 5 have a cylindrical shape in which the opening area of the tip injection port is narrowed, the nozzles 73 and 83 are heated from the injection port toward the surface of the sheet material S. The dry gas can be blown vigorously. Then, the ink composition on the surface of the sheet material S can be quickly dried by the heat of the drying gas and the wind speed.

  However, immediately after the sheet material S is supplied to the drying device 60, when the drying gas is vigorously blown onto the ink composition, the drying of the surface layer of the ink composition proceeds rapidly to the surface layer of the ink composition. A dried film is formed, and the drying inside the ink composition does not easily proceed in the subsequent drying process. And when the sheet material S is sent from the drying device 60 in a state where the drying inside the ink composition is insufficient, there is a problem that many volatile organic solvents remain in the ink composition of the sheet material S after drying. Will occur.

  The present invention has been made in view of the above circumstances, and the ink composition or adhesion is maintained while maintaining the current speed of printing processing or the like of the sheet material on which the ink composition or adhesive is applied (printed) on the surface. An object of the present invention is to provide a drying device capable of reducing the residual amount of the volatile organic solvent in the agent, and a nozzle provided in the drying device.

  Hereinafter, each means suitable for solving the above-described problems will be described with additional effects and the like as necessary.

  (1) The nozzle of the present invention is a nozzle that blows a dry gas for drying an ink composition or an adhesive applied to a belt-shaped sheet material toward the sheet material while the sheet material is running, The nozzle includes a cylindrical nozzle body through which the dry gas passes, an inlet formed on a proximal end side of the nozzle body and into which the dry gas flows, and a nozzle body formed on the distal end side of the nozzle body. The inlet and the outlet have an opening shape that is long in the width direction of the sheet material, and the opening area of the outlet is larger than the opening area of the inlet. And in the cross section obtained by cutting the nozzle body parallel to the running direction of the sheet material and perpendicular to the surface of the sheet material, the interval between the inner wall surfaces facing each other of the nozzle body is from the inflow port to the injection port. Uniform or la Characterized in that expanding the path shape.

  According to such a configuration, the opening area of the nozzle injection port is larger than the opening area of the inlet, and the interval between the inner wall surfaces facing each other of the nozzle body is uniform or a wrapper from the inlet to the injection port. It is expanding in the shape. Thereby, dry gas can be sprayed on a wide range with a weak wind speed toward a sheet | seat material from an injection nozzle.

  Therefore, by using the nozzle of the present invention, the drying can proceed relatively evenly from the surface of the ink composition or adhesive to the inside without forming a dry film on the surface of the ink composition or adhesive. Can do. Thereby, a volatile organic solvent becomes difficult to remain in the ink composition or adhesive agent of the sheet material after drying.

  In addition, as an adhesive agent apply | coated to the above-mentioned strip | belt-shaped sheet | seat material, there exists an adhesive agent used for the dry lamination and extrusion lamination of a food packaging film, for example.

  (2) In the nozzle of the present invention, preferably, the inner wall surfaces of the nozzle body facing each other in a cross section obtained by cutting the nozzle body in a direction parallel to the traveling direction of the sheet material and perpendicular to the surface of the sheet material. Is an angle between 0 degrees and 90 degrees.

  According to such a configuration, the angle formed by the inner wall surfaces facing each other of the nozzle body is 0 degree or more and 90 degrees or less. As the angle formed between the inner wall surfaces is larger, the dry gas can be blown from a jet port toward the sheet material at a lower wind speed and in a wider range. However, if the angle between the inner wall surfaces is excessively increased, the wind speed of the drying gas becomes too weak, and the drying efficiency of the ink composition or adhesive (the amount of ink composition or adhesive dried per hour) is remarkably high. descend. Therefore, the upper limit of the angle formed by the inner wall surfaces is 90 degrees.

  In addition, if the angle formed between the inner wall surfaces facing each other in the nozzle body is in the range of 0 degrees or more and 90 degrees or less, the angle formed between each inner wall surface and the opening plane of the inflow port may be an uneven angle. Good. For example, by making the angle formed by one inner wall surface and the opening plane of the inlet larger than the angle formed by the other inner wall surface and the opening plane of the inlet, the injection direction of the dry gas injected from the injection port Can be biased toward one inner wall surface.

  (3) In the nozzle of the present invention, preferably, the inflow port has an opening shape in which the opening width in the vicinity of the central portion in the longitudinal direction of the inflow port is wider than the opening width in the vicinity of both end portions. And

  According to such a configuration, the opening width in the vicinity of the center portion in the longitudinal direction of the inflow port is wider than the opening width in the vicinity of both end portions. A large amount of dry gas flows in. Also in the injection port, a larger amount of dry gas is injected from the vicinity of the center in the longitudinal direction of the injection port than from the vicinity of both ends.

  Since the dry gas blown toward the sheet material flows toward both ends in the width direction of the sheet material, it tends to stagnate near the center in the width direction of the sheet material, and flows near both ends in the width direction of the sheet material. Is good. Therefore, the ink composition or adhesive near the center in the width direction of the sheet material is less likely to dry than the ink composition or adhesive near both ends. Here, as in the present invention, a large amount of dry gas is ejected from the vicinity of the center in the longitudinal direction of the ejection port from the vicinity of both ends, thereby uniformly distributing the ink composition or the adhesive over the entire width of the sheet material. Can be dried.

  (4) The drying device of the present invention is a method of blowing a dry gas for drying an ink composition or an adhesive applied to a belt-shaped sheet material toward the sheet material while the sheet material is traveling. A drying apparatus including a nozzle group arranged in a running direction, wherein at least one nozzle in the nozzle group is the nozzle described in (1) to (3).

  According to such a configuration, at least one nozzle in the nozzle group is the nozzle described in the above (1) to (3). As a result, as described in the above (1) to (3), as compared with the case where all the nozzles constituting the nozzle group are conventional nozzles in which the opening area of the nozzle at the tip is narrowed down, the ink composition The effect of reducing the residual amount of the volatile organic solvent in the object or the adhesive can be enhanced.

  (5) In the drying apparatus of the present invention, preferably, a plurality of nozzles arranged from the uppermost stream in the traveling direction of the sheet material in the nozzle group toward the downstream side are in (1) to (3). It is the said nozzle, It is characterized by the above-mentioned.

  The earlier the dried film formed on the surface of the ink composition or adhesive, the more difficult the drying of the ink composition or adhesive proceeds in the subsequent drying process. The volatile organic solvent tends to remain in the ink composition or adhesive of the sheet material. On the other hand, when a dried film is formed on the surface of the ink composition or adhesive after the ink composition or adhesive has been dried to some extent, a volatile organic solvent remains in the ink composition or adhesive. The problem is less likely to occur. Therefore, it is better to avoid rapid drying of the ink composition or the adhesive toward the upstream side where the sheet material is supplied to the drying device.

  As in the configuration of the present invention, the nozzles described in (1) to (3) are arranged as a plurality of nozzles arranged from the uppermost stream in the traveling direction of the sheet material in the nozzle group toward the downstream side. In this case, the effect of reducing the residual amount of the volatile organic solvent in the ink composition or the adhesive can be enhanced as compared with the case where the ink composition or the adhesive is disposed on the downstream side.

  According to the present invention, the volatile organic solvent residual amount of the ink composition or the adhesive is adjusted while maintaining the current speed of the printing process or the like of the sheet material on which the ink composition or the adhesive is applied (printed) on the surface. It is possible to provide a drying device that can be reduced, and a nozzle provided in the drying device.

It is sectional drawing which illustrates typically a printing machine provided with the drying apparatus of this embodiment. It is a perspective view of the nozzle with which the drying apparatus of this embodiment is equipped. It is sectional drawing of the nozzle cut | disconnected by the AA line in FIG. It is sectional drawing of the nozzle cut | disconnected by the BB line in FIG. It is sectional drawing which illustrates typically a printing machine provided with the conventional drying apparatus.

  Hereinafter, embodiments of a nozzle of the present invention and a drying apparatus including the nozzle will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view schematically illustrating a printing press provided with the drying device of the present embodiment, FIG. 2 is a perspective view of a nozzle provided in the drying device of the present embodiment, and FIG. 3 is cut along line AA in FIG. FIG. 4 is a sectional view of the nozzle cut along the line BB in FIG.

  As shown in FIG. 1, the drying apparatus 1 is disposed from the central part to the upper part of the printing press 50, and the printing main body part 51 is disposed at the lower part. A long strip-shaped sheet material S having a width of about 1 m is supplied from the right side of the center height in the drawing of the printing machine 50 and is guided to the lower printing body 51 by four guide rollers 54 to 57. Printing is performed while passing between the plate cylinder 53, guided to the upper drying device 1 by the guide roller 58, passed through the drying device 1 from bottom to top, and then sent to the upper right side by the guide roller 59. It has come to be.

  The drying device 1 includes a lower drying chamber 30, an upper drying chamber 40, a lower pressurizing duct 31, an upper pressurizing duct 41, a lower suction duct 32, an upper suction duct 42, and a blower and a heater (not shown). . Five lower nozzles 10 are provided in the lower drying chamber 30, and four upper nozzles 20 are provided in the upper drying chamber 40. The lower nozzle 10 is a nozzle of the present invention, and the upper nozzle 20 is a nozzle having the same shape as the conventional nozzle 83 shown in FIG.

  The lower drying chamber 30 and the upper drying chamber 40 are both formed of box-shaped members and are arranged one above the other. This configuration corresponds to dividing one drying chamber into two upper and lower chambers by a partition wall.

  As shown in FIG. 1, the lower drying chamber 30 is distinguished by a lower partition plate 33 into a left lower pressurizing chamber 34 and a right lower negative pressure chamber 35. A sheet introduction port 36 is provided on the lower surface of the lower negative pressure chamber 35, and a sheet passage port 37 communicating with the upper drying chamber 40 is provided on the upper surface. In the lower negative pressure chamber 35, five guide rollers 38 having a diameter of 100 mm are arranged side by side. A lower pressure duct 31 is provided in communication with the lower pressure chamber 34, and a lower suction duct 32 is provided in communication with the lower negative pressure chamber 35. The lower pressurizing duct 31 communicates with a blower and a heater (not shown), and the lower suction duct 32 communicates with an exhaust gas treatment unit (not shown).

  The sheet material S can smoothly pass through the vicinity of the lower partition plate 33 while sequentially contacting the guide roller 38 from the sheet introduction port 36 to the sheet passage port 37. A lower nozzle 10 that protrudes toward the guide roller 38 and that has a front-end injection port enlarged in a trumpet shape is provided at each position of the lower partition plate 33 that faces each guide roller 38. The distance between the tip of the lower nozzle 10 and the sheet material S is about 20 mm.

  The upper drying chamber 40 has a structure similar to that of the lower drying chamber 30, and is distinguished by an upper partition plate 43 into a left upper pressurizing chamber 44 and a right upper negative pressure chamber 45. A sheet passing port 37 communicates with the lower surface of the upper negative pressure chamber 45 from the lower negative pressure chamber 35, and a sheet delivery port 46 is provided on the upper right surface. In the upper negative pressure chamber 45, four guide rollers 47 having a diameter of 100 mm are arranged obliquely. An upper pressure duct 41 is provided in communication with the upper pressure chamber 44, and an upper suction duct 42 is provided in communication with the upper negative pressure chamber 45. The upper pressurizing duct 41 communicates with a blower and a heater (not shown), and the upper suction duct 42 communicates with an exhaust gas treatment unit (not shown).

  The sheet material S can smoothly pass through the vicinity of the upper partition plate 43 while sequentially contacting the guide roller 47 from the sheet passing port 37 to the sheet delivery port 46. The upper nozzle 20 that protrudes toward the guide roller 47 and narrows the opening area of the injection port at the tip is provided at a position facing each guide roller 47 of the upper partition plate 43. The separation between the tip of the upper nozzle 20 and the sheet material S is about 20 mm.

  2 to 4, the lower nozzle 10 includes a cylindrical nozzle body 11 through which the dry gas passes, an inlet 12 that is formed on the base end side of the nozzle body 11 and into which the dry gas flows, and the nozzle body 11. The nozzle 13 is formed on the front end side of the nozzle and sprays dry gas, and the substrate 14 for attaching the nozzle body 11 to the lower partition plate 33 is provided.

  The nozzle body 11 has a rectangular cylindrical shape, and the length of the nozzle body 11 in the longitudinal direction is about 1 m in accordance with the width of the sheet material S. 3 and 4 show a cross section in which the nozzle body 11 is cut parallel to the traveling direction of the sheet material S and perpendicular to the surface of the sheet material S. FIG. The space between the inner wall surfaces 11 a and 11 b facing each other of the nozzle body 11 is enlarged in a trumpet shape from the inflow port 12 toward the injection port 13.

  A joint portion 11c that is bent in a direction parallel to the lower partition plate 33 is formed on the base end side of each inner wall surface 11a, 11b, and a rectangular substrate 14 overlaps the joint portion 11c. It is joined. The substrate 14 is formed with a plurality of bolt holes 15 for fixing the substrate 14 to the lower partition plate 33 with bolts.

  The inflow port 12 and the injection port 13 have an opening shape that is long in the width direction of the sheet material S, and the opening area of the injection port 13 is larger than the opening area of the inflow port 12.

The inflow port 12 is a substantially rhombic opening that penetrates the surface of the substrate 14, and the length of the indentation 12 in the longitudinal direction of the inflow port 12 is about 1 m in accordance with the width of the sheet material S. As shown in FIGS. 3 and 4, the opening width a ₁ near the longitudinal center of the inlet 12 is wider than the opening width a ₂ near both ends of the inlet 12 in the longitudinal direction.

  The injection port 13 is a rectangular opening section defined by a rectangular inner wall surface (each inner wall surface 11a, 11b and an inner wall surface orthogonal thereto) on the tip side of the nozzle body 11, and the rectangular longitudinal direction of the injection port 13 Is about 1 m in accordance with the width of the sheet material S. As shown in FIGS. 3 and 4, the opening width b of the injection port 13 is constant in the longitudinal direction of the injection port 13.

3 and 4, the dimensions of the lower nozzle 10 are as follows: the opening width a ₁ = 7 mm of the inlet 12, a ₂ = 1.5 mm, the opening width b = 21 mm of the injection port 13, and the protruding length c of the lower nozzle 10. = 87 mm. The angle α formed by the upper inner wall surface 11a and the angle β formed by the lower inner wall surface 11b with respect to the horizontal direction in the figure are equal to each other, and the angle α = β = 4.6 degrees. Therefore, the angle θ between the opposing inner wall surfaces 11a and 11b is 9.2 °.

  The operation of the lower drying chamber 30 of the drying apparatus 1 configured as described above is as follows. After the outside air taken in as the dry gas is heated by a heater (not shown), the heated dry gas is sent to the lower pressurizing chamber 34 via the lower pressurizing duct 31 by a blower (not shown) to be in a pressurized state. . On the other hand, negative pressure acts on the lower negative pressure chamber 35 via the lower pressurization duct 31 by suction by an exhaust gas treatment unit (not shown). Due to the pressure difference between the lower pressurizing chamber 34 and the lower negative pressure chamber 35, dry gas is blown from the five lower nozzles 10 toward the printing surface of the sheet material S to volatilize the solvent in the ink composition. Dry. At this time, since the back surface of the sheet material S is held in contact with the guide roller 38, the sheet material S does not move and is stably dried.

  Here, the wind speed of the dry gas jetted from the jet nozzle 13 of the lower nozzle 10 is 12 m / sec, and the wind speed is about 1/3 of the wind speed 35 m / sec of the dry gas jetted from the jet nozzle of the upper nozzle 20. Yes. Since the operation of the upper drying chamber 40 is the same as that of the lower drying chamber 30, the description thereof is omitted.

  According to such a configuration of the present embodiment, the opening area of the injection port 13 of the lower nozzle 10 is larger than the opening area of the inflow port 12, and the interval between the opposing inner wall surfaces 11 a and 11 b of the nozzle body 11. Is enlarged in a trumpet shape from the inlet 12 toward the injection port 13. Thereby, dry gas can be sprayed on a wide range with a wind speed weaker than the conventional nozzle (upper nozzle 20) toward the sheet | seat material S from the injection nozzle 13. FIG.

  Therefore, by using the lower nozzle 10 of the present embodiment, drying can proceed relatively evenly from the surface layer to the inside of the ink composition without forming a dried film on the surface layer of the ink composition. As a result, the volatile organic solvent hardly remains in the ink composition of the sheet material S after drying.

Further, according to the configuration of the present embodiment, the opening width a _{1 in the} vicinity of the center portion in the longitudinal direction of the inlet 12 of the lower nozzle 10 is wider than the opening width a _{2 in the} vicinity of both ends in the longitudinal direction of the inlet 12. ing. As a result, a larger amount of dry gas flows from near the center in the longitudinal direction of the inlet 12 than near both ends. Also in the injection port 13, a larger amount of dry gas is injected from the vicinity of the central portion in the longitudinal direction of the injection port 13 than the vicinity of both ends. Thereby, the ink composition can be dried uniformly over the entire width of the sheet material S.

  Further, according to the configuration of the present embodiment, the lower nozzle 10 that is the nozzle of the present invention is disposed in the lower drying chamber 30 located on the upstream side in the traveling direction of the sheet material S, and the downstream of the sheet material S in the traveling direction. The upper nozzle 20 which is a conventional nozzle is disposed in the upper drying chamber 40 located on the side. Thus, by arranging the nozzle of the present invention as a plurality of nozzles arranged from the uppermost stream in the traveling direction of the sheet material S in the nozzle group toward the downstream side, than the case of being arranged on the downstream side. Also, the effect of reducing the residual amount of the volatile organic solvent in the ink composition can be enhanced.

  The nozzle and the drying device of the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made by those skilled in the art without departing from the gist of the present invention. It goes without saying that it can be implemented.

  For example, the dry gas in the present embodiment is heated by a heater (not shown), but an unheated dry gas can also be used.

  Further, in the lower nozzle 10 in the present embodiment, the angle θ formed by the inner wall surfaces 11a and 11b facing each other of the nozzle body 11 is set to 9.2 degrees, but the angle θ formed is in the range of 0 degrees to 90 degrees. Can be set freely. In the present embodiment, the angles α and β formed with respect to the left and right directions of the inner wall surfaces 11a and 11b are equal to each other, but the angles α and β formed may be different from each other.

  In this embodiment, all the nozzle groups disposed in the lower drying chamber 30 are the nozzles of the present invention (lower nozzle 10), and all the nozzle groups disposed in the upper drying chamber 40 are conventional nozzles (upper nozzles). Nozzle 20), the nozzle group disposed in the lower drying chamber 30 may include conventional nozzles, and the nozzle group of the present invention may be included in the nozzle group disposed in the upper drying chamber 40. It may be included.

  In addition, the drying apparatus 1 of the present embodiment has two drying chambers, the lower drying chamber 30 and the upper drying chamber 40, but the number of drying chambers is not limited to two, and one or three chambers. It is good also as above.

  In the present embodiment, the ink composition printed on the sheet material S having a width of about 1 m is dried by the drying device 1, but the width of the sheet material is not limited to this. For example, the ink composition printed on the sheet material having a width of 0.4 to 2 m can be dried by appropriately improving the drying device 1 of the present embodiment.

  Needless to say, the drying apparatus 1 of the present embodiment can be applied as a drying apparatus of various printing methods having different detailed configurations from the present embodiment. Furthermore, it cannot be overemphasized that the drying apparatus 1 of this embodiment can be applied as a drying apparatus for drying the adhesive applied to the food packaging film, for example, in dry lamination or extrusion lamination of food packaging film (sheet material). .

DESCRIPTION OF SYMBOLS 1 ... Drying apparatus 10 ... Lower nozzle (nozzle)
11 ... nozzle body 11a ... inner wall surface 11b ... inner wall surface 12 ... inlet 13 ... injection opening S ... sheet material _{a 1,} a ₂ ... opening width theta ... angle

Claims (5)

A nozzle that blows a dry gas for drying an ink composition or an adhesive applied to a belt-shaped sheet material toward the sheet material while the sheet material is running,
The nozzle includes a cylindrical nozzle body through which the dry gas passes, an inlet formed on a proximal end side of the nozzle body and into which the dry gas flows, and a nozzle body formed on the distal end side of the nozzle body. An injection port for injecting,
The inflow port and the injection port have an opening shape long in the width direction of the sheet material, and the opening area of the injection port is larger than the opening area of the inflow port,
In a cross section in which the nozzle body is cut in a direction parallel to the traveling direction of the sheet material and perpendicular to the surface of the sheet material, the interval between the inner wall surfaces facing each other of the nozzle body is from the inlet to the injection port. A nozzle characterized by expanding uniformly or in a trumpet shape.   In a cross section obtained by cutting the nozzle body in a direction parallel to the running direction of the sheet material and perpendicular to the surface of the sheet material, an angle formed by the inner wall surfaces facing each other of the nozzle body is 0 degree or more and 90 degrees or less. The nozzle according to claim 1.   The nozzle according to claim 1, wherein the inlet has an opening shape in which an opening width in the vicinity of a central portion in the longitudinal direction of the inlet is wider than opening widths in the vicinity of both ends. Drying provided with a group of nozzles arranged in the running direction of the sheet material that blows a dry gas for drying the ink composition or adhesive applied to the belt-like sheet material toward the sheet material during the running of the sheet material A device,
The drying apparatus according to claim 1, wherein at least one nozzle in the nozzle group is the nozzle according to claim 1.   5. The nozzle according to claim 1, wherein a plurality of nozzles arranged from the uppermost stream in the traveling direction of the sheet material to the downstream side in the nozzle group are the nozzles according to claim 1. Drying equipment.

Images