JP2019195957A - Ink jet printer - Google Patents

Abstract

To provide an ink jet printer which can maintain a certain distance between a discharge port of a print head and a surface of a printing object matter facing the discharge port.SOLUTION: An ink jet printer for performing ink jet printing on a sheet-like printing object matter conveyed along a conveyance path includes: a print head which discharges ink onto a first surface of the printing object matter at the midway of the conveyance path; a support base which has a support surface supporting the second surface being opposite to the first surface of the printing object matter and arranged so as to face the print head; and negative pressure generation means which generates the negative pressure between the second surface of the printing object matter and the support surface of the support base.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an inkjet printing apparatus.

  An ink jet printing apparatus is known as a printing apparatus that prints characters, symbols, and the like on a print object (for example, Patent Document 1).

  The ink jet printing apparatus described in Patent Document 1 includes a print head that ejects ink onto a print object (specifically, a flexible packaging material).

Japanese Patent Laid-Open No. 11-115166

  The ink jet printing apparatus described in Patent Document 1 is conveyed from the print head to the print target (conveyed from the unwinding unit to the winding unit) by a conveying device including an unwinding unit and a winding unit. Are ejected to print characters or symbols on the print object.

  However, in the inkjet printing apparatus described in Patent Document 1, when the print object is being conveyed by the conveyance apparatus, the print object is in a direction perpendicular to the conveyance direction (the thickness direction of the print object). The printed object sometimes fluttered in the vertical direction. When the print object flutters in the vertical direction, the distance between the ink discharge port of the print head and the surface of the print object facing the discharge port cannot be maintained at a constant distance. The print quality of characters and symbols printed on the object may not be stable, and the resolution of characters and symbols printed on the print object may decrease. When the resolution of characters and symbols is thus reduced, the characters printed on the printing object are read with the naked eye, and the barcodes and other symbols printed on the printing object are read by a reading device such as a barcode reader. There was a problem that it would be difficult to read with.

  Therefore, in view of the above problems, the present invention provides an ink jet printing apparatus that can maintain a constant distance between the discharge port of the print head and the surface of the print object facing the discharge port. Let it be an issue.

The ink jet printing apparatus according to the present invention performs ink jet printing on a sheet-like print object being transported along a transport path. The ink jet apparatus includes a print head, a support base, and negative pressure generating means. The print head discharges ink onto the first surface of the print object at a midway position in the transport path. The support base has a support surface that supports a second surface opposite to the first surface of the printing object, and is arranged so that the support surface faces the print head. The negative pressure generating means generates a negative pressure between the second surface of the printing object and the support surface of the support base.
According to this configuration, the negative pressure generating means generates a negative pressure between the second surface of the printing object and the support surface of the support base. Therefore, it is possible to prevent the printing object from vibrating in a direction perpendicular to the conveyance path when the printing object is conveyed along the conveyance path. As a result, the distance between the print head and the second surface of the print object can be kept constant, and the print quality can be improved.

The inkjet printing apparatus preferably has the following configuration. The support surface is formed with a plurality of openings communicating with the negative pressure generating means. The plurality of openings are disposed so as to be displaced upstream or downstream of the conveyance path with respect to the print head.
According to this configuration, the support surface is formed with a plurality of openings communicating with the negative pressure generating means. Thereby, a negative pressure can be generated between the second surface of the printing object and the support surface of the support base.
By the way, in the configuration as described above, in the printing object, each portion that overlaps each of the plurality of openings may be dented and distorted by negative pressure. When the ink from the print head is ejected to the distorted portion, the print quality is deteriorated.
In consideration of this point, the plurality of openings are arranged so as to be displaced upstream or downstream of the conveyance path with respect to the print head. Therefore, the ink from the print head can be ejected to the undistorted portion of the print object, and the print quality can be improved.

The inkjet printing apparatus preferably has the following configuration. The ink jet printing apparatus further includes a static elimination unit. The static elimination unit removes static electricity from the print target on the downstream side of the transport path from the print head.
According to this configuration, even if static electricity is generated due to friction between the printing object and the support base, the static electricity can be removed from the printing object. Therefore, when the printing object is used as a packaging material, it is possible to prevent the packaged material from adhering to the packaging material.

The inkjet printing apparatus preferably has the following configuration. The ink jet printing apparatus further includes a light source that generates ultraviolet rays. The negative pressure generating means includes a negative pressure container that forms a negative pressure chamber communicating with the plurality of openings in cooperation with the support base. The light source is disposed in the negative pressure chamber. Static electricity is removed from the printing object by irradiating the second surface of the printing object with ultraviolet rays from a light source through a plurality of openings.
According to this configuration, the second surface of the printing object can be irradiated with ultraviolet rays in a negative pressure environment. Accordingly, static electricity can be effectively removed from the printing object.

The inkjet printing apparatus preferably has the following configuration. The plurality of openings includes a group of openings positioned downstream of the transport path from the print head. Ultraviolet light from the light source is applied to the second surface of the printing object through the aperture group.
According to this configuration, static electricity can be removed from the print object downstream of the transport path from the print head. Therefore, even if static electricity is generated by friction between the printing object and the support base, the static electricity can be removed from the printing object. As a result, when the printing object is used as a packaging material, it is possible to prevent the packaged material from adhering to the packaging material.

The inkjet printing apparatus preferably has the following configuration. A support stand is provided with the permeation | transmission part which can permeate | transmit an ultraviolet-ray. The second surface of the printing object is sterilized by irradiating the second surface of the printing object with ultraviolet rays from the light source through the transmission part.
According to this configuration, the second surface of the printing object can be sterilized. Therefore, when the printing object is used as a packaging material, the sterilized second surface of the packaging material is a surface that comes into contact with the packaged object, so that the packaged object is contaminated with various germs. Can be prevented. Further, the light source can be used not only for removing static electricity from the printing object but also for sterilizing the second surface of the printing object. Therefore, the number of parts can be reduced as compared with the case where a light source is provided for each application.

The inkjet printing apparatus preferably has the following configuration. The ink is an ultraviolet curable ink that is cured by ultraviolet rays. The printing object can transmit ultraviolet rays. The transmission part is located downstream of the transport path from the print head. The ink ejected from the print head and landed on the first surface of the printing object is irradiated on the first surface of the printing object by irradiating the ultraviolet light from the light source through the transmission part and the printing object. Cured ink is cured.
According to this configuration, in addition to the use of removing the static electricity from the print object and the use of sterilizing the second surface of the print object, the ink that has landed on the first surface of the print object is cured. It can also be used for the purpose of Therefore, the number of parts can be reduced as compared with the case where a light source is provided for each application.

The inkjet printing apparatus preferably has the following configuration. The inkjet printing apparatus further includes a second light source. The second light source is provided separately from the first light source as the light source and generates ultraviolet rays. By irradiating the ink ejected from the print head and landed on the first surface of the print object with ultraviolet light from the second light source from the side opposite to the first light source, the first surface of the print object The ink landed on top is cured.
According to this configuration, the ink that has landed on the first surface of the print object can be irradiated with ultraviolet rays not only from the print object side but also from the opposite side. Therefore, the ink that has landed on the first surface of the printing object can be quickly cured.

  ADVANTAGE OF THE INVENTION According to this invention, the inkjet printing apparatus which can maintain the distance of the discharge port of a printing head and the surface of the printing target object which faces this discharge port to a fixed distance can be provided.

1 is a schematic configuration diagram illustrating an inkjet printing apparatus according to an embodiment of the present invention. It is a front view which shows a support stand. It is sectional drawing which expands and shows a part (near transmission part) of a support stand.

  Hereinafter, an embodiment of the present invention will be described.

FIG. 1 is a schematic configuration diagram illustrating an inkjet printing apparatus 10 according to an embodiment of the present invention.
The ink jet apparatus 10 according to the present embodiment performs ink jet printing on a sheet-like print target 20 that is being transported along a transport path (a path in the arrow direction in FIG. 1). The print object 20 is long. The printing object 20 is a web material. The printing object 20 can transmit ultraviolet rays in the thickness direction.

  The printing object 20 is used as a packaging material, for example. A packaging bag is formed by heat-sealing the printing object 20 as a packaging material. An article to be packaged is accommodated in the packaging bag. Examples of packages include drugs and foods.

  The printing object 20 includes a base material and a heat welding layer. The heat welding layer is disposed on the substrate. The base material is made of a material that does not repel ink, or the surface (first surface 20a described later) is processed so that ink is attached to the base material. Examples of the base material include glassine, cellophane, and polyethylene terephthalate (PET). Examples of the material for the heat welding layer include polyethylene.

  The print object 20 has a first surface 20a and a second surface 20b opposite to the first surface 20a. The first surface 20a is a surface on the base material side. The first surface 20a is a surface that faces outward when the printing object 20 is used as a packaging material. The second surface 20b is the surface on the heat welding layer side. The second surface 20b is a surface that faces inward when the printing object 20 is used as a packaging material, and is therefore a surface that comes into contact with the package object at that time. Of these first surface 20a and second surface 20b, the first surface 20a is a surface on which ink jet printing is performed.

  The print object 20 is transported by the transport device 30. The transport device 30 includes an unwinding unit 31 and a winding unit 32. The conveyance device 30 conveys the printing object 20 from the unwinding unit 31 to the winding unit 32 along the conveyance path. The unwinding unit 31 unwinds the printing object 20 from a roll around which the printing object 20 before printing is wound. The winding unit 32 winds up the printed object 20 after printing.

  The ink jet printing apparatus 10 according to the present embodiment includes a print head 11, a support base 12, and a negative pressure generating unit 13. The print head 11 ejects ink onto the first surface 20a of the print object 20 at a midway position in the transport path. The support base 12 has a support surface 12 a that supports the second surface 20 b of the print object 20, and is arranged so that the support surface 12 a faces the print head 11. The negative pressure generating means 13 generates a negative pressure between the second surface 20 b of the printing object 20 and the support surface 12 a of the support base 12. According to this configuration, the negative pressure generating means 13 generates a negative pressure between the second surface 20 b of the printing object 20 and the support surface 12 a of the support base 12. For this reason, the 1st surface 20a is attracted | sucked with respect to the support surface 12a. Therefore, when the printing object 20 is being conveyed along the conveyance path, it is possible to prevent the printing object 20 from vibrating in the direction perpendicular to the conveyance path (the thickness direction of the printing object 20). As a result, the distance between the print head 11 and the first surface 20a of the print object 20 can be kept constant, and the print quality can be improved.

  The print head 11 is an inkjet head. The print head 11 may be a piezo type or a thermal type.

  As the ink ejected from the print head 11, ultraviolet curable ink that is cured by ultraviolet rays is used. The color of the ink is not particularly limited. As the ink ejected from the print head, for example, a plurality of types of ink having different colors (cyan, magenta, yellow, and black) are used.

  The print head 11 has a large number of nozzles. A large number of nozzles are arranged so as to be aligned in the width direction of the printing object 20 being conveyed along the conveyance path. Many nozzles may be arrange | positioned over the whole width direction of the printing target object 20. FIG. In this case, inkjet printing can be performed on the print object 20 at an arbitrary position in the width direction without moving the print head 11 in the width direction of the print object 20. A large number of nozzles may be arranged in a part of the print object 20 in the width direction. In this case, inkjet printing can be performed on the print object 20 at an arbitrary position in the width direction by appropriately moving the print head 11 in the width direction of the print object 20.

  FIG. 2 is a front view showing the support base 12. FIG. 3 is an enlarged cross-sectional view showing a part of the support 12. The support base 12 is formed in a flat plate shape. One surface in the thickness direction of the support base 12 is a support surface 12a.

  A plurality of through holes 12b penetrating in the thickness direction are formed in the support base 12. Therefore, a plurality of openings 12 c are formed in the support surface 12 a of the support base 12. The plurality of openings 12c are formed at intervals in a direction along the conveyance path and in a direction crossing the conveyance path. Each opening 12c communicates with the negative pressure generating means 13 through each through hole 12b. Thereby, a negative pressure can be generated between the second surface 20 b of the print object 20 and the support surface 12 a of the support base 12.

  The size, the number, the arrangement, and the like of the plurality of openings 12c are set so that the conveyance of the print target 20 is not hindered. The size of the plurality of openings 12c may be uniform or non-uniform. The density of the plurality of openings 12c (the number of openings per unit area) may be uniform over the entire support surface 12a or may be non-uniform.

  By the way, in the structure as mentioned above, the part which overlaps each of several opening 12c in the printing target object 20 may be dented and distorted by a negative pressure. When the ink from the print head 11 is ejected to the distorted portion, the print quality is deteriorated.

  In consideration of this point, the plurality of openings 12 c are arranged so as to be displaced upstream or downstream of the transport path with respect to the print head 11. Specifically, the plurality of openings 12c are arranged so as to be displaced upstream or downstream of the conveyance path with respect to the landing position A where the ink ejected from the print head 11 lands on the first surface 20a of the print target 20. Is done. Therefore, the ink from the print head 11 can be ejected to the undistorted portion of the print object 20, and the print quality can be improved. The landing means that the ink ejected from the print head 11 is attached to the first surface 20a of the print object 20.

  The plurality of openings 12c include a first opening group 12c1 and a second opening group 12c2. The first opening group 12c1 is located upstream of the print head 11 in the conveyance path (the arrow direction in FIG. 2). Specifically, the first opening group 12c1 is positioned upstream of the conveyance path from the landing position A of the ink ejected from the print head 11. The second opening group 12c2 is located downstream of the transport path from the print head 11. Specifically, the second opening group 12c2 is positioned downstream of the conveyance path from the landing position A of the ink ejected from the print head 11.

  The support base 12 includes a transmission part 12d that can transmit ultraviolet rays. The transmission part 12d is located downstream of the transport path from the print head 11. Specifically, the transmission portion 12d is located downstream from the landing position A of the ink ejected from the print head 11. The transmission part 12d extends in a direction crossing the conveyance path (the width direction of the print target 20 being conveyed along the conveyance path). The transmissive portion 12d extends over the entire width direction of the print object 20.

  The transmission part 12d is configured by a transmission member 12d1 that can transmit ultraviolet rays. The transmissive member 12d1 is made of, for example, an acrylic resin. The transmission member 12d1 is obtained by processing an acrylic plate.

  The transmission member 12 d 1 is attached to the main body portion of the support base 12. A long hole 12e is formed in the main body portion of the support base 12. The long hole 12e extends through the main body portion of the support base 12 in the thickness direction and in a direction crossing the conveyance path. The transmissive member 12d1 includes a plate-like portion 12d1b and a ridge portion 12d1a protruding from one surface (the upper surface in FIG. 3) of the plate-like portion 12d1b. The protruding portion 12 d 1 a fills the long hole 12 e in the main body portion of the support base 12. The transmissive member 12d1 is fixed to the main body portion of the support base 12 with an adhesive, for example.

  The transmission member 12d1 is attached to the main body portion of the support base 12 from the side opposite to the support surface 12a. At this time, the protruding portion 12d1a of the transmission member 12d1 is inserted into the elongated hole 12e of the main body portion of the support base 12, and one surface of the plate-like portion 12d1b of the transmission member 12d1 is the lower surface of the main body portion of the support base 12 (in FIG. 3). Abutting the lower surface). The front end surface 12d1a1 of the protruding portion 12d1a of the transmission member 12d1 is flush with the support surface 12a. For this reason, the protruding portion 12d1a of the transmission member 12d1 does not hinder the conveyance of the printing object 20.

  Referring again to FIG. 1, the negative pressure generating means 13 includes a negative pressure vessel 13a and a vacuum pump 13b. The negative pressure container 13a forms a negative pressure chamber 13a1 in cooperation with the support base 12. The negative pressure vessel 13a and the support base 12 may be formed separately or may be formed integrally. The negative pressure chamber 13a1 communicates with the plurality of openings 12c through the plurality of through holes 12b. The vacuum pump 13b is connected to the negative pressure vessel 13a. The vacuum pump 13b makes the negative pressure chamber 13a1 have a negative pressure.

  The inkjet printing apparatus 10 according to the present embodiment includes a first light source 40 and a second light source 50 provided separately from the first light source 40. The first light source 40 is disposed in the negative pressure chamber 13a1. The first light source 40 is arranged downstream of the transport path from the print head 11. The second light source 50 is disposed on the opposite side of the print object 20 from the first light source 40. The second light source 50 is disposed downstream of the transport path from the print head 11.

  The first light source 40 and the second light source 50 may be arranged at the same position in the direction along the conveyance path, or may be arranged at different positions. When the 1st light source 40 and the 2nd light source 50 are arrange | positioned in a mutually different position, the 2nd light source 50 may be arrange | positioned upstream of a conveyance path rather than the 1st light source 40, or it is downstream of a conveyance path. May be arranged.

  The first light source 40 and the second light source 50 generate ultraviolet rays. Examples of the first light source 40 and the second light source 50 include a light emitting diode, a laser diode, a mercury lamp, a metal halide lamp, a xenon lamp, an excimer lamp, and a deuterium lamp. The types of the first light source 40 and the second light source 50 may be the same or different from each other.

Ultraviolet rays from the first light source 40 are applied to the second surface 20b of the printing object 20 through the plurality of openings 12c. According to this configuration, it is possible to irradiate the second surface 20b of the printing object 20 with ultraviolet rays under a negative pressure environment. Therefore, static electricity can be effectively removed from the printing object 20.
Specifically, the ultraviolet light from the first light source 40 is applied to the second surface 20b of the print object 20 through the second opening group 12c2. According to this configuration, static electricity can be removed from the print target 20 downstream of the print head 11 in the conveyance path. Therefore, even if static electricity is generated by friction between the printing object 20 and the support base 12, the static electricity can be removed from the printing object 20. As a result, when the printing object 20 is used as a packaging material, it is possible to prevent the packaged material from adhering to the packaging material.

  Thus, the 1st light source 40 functions as a static elimination means. Specifically, the first light source 40 functions as a static elimination means in cooperation with the support base 12 and the negative pressure generating means 13. Here, as the first light source 40, it is preferable to use a deuterium lamp having an excellent charge eliminating effect under a negative pressure. By irradiating the printing object 20 with ultraviolet rays from a deuterium lamp under a negative pressure environment, static electricity can be effectively removed from the printing object 20.

Further, the ultraviolet light from the first light source 40 is applied to the second surface 20b of the print object 20 through the transmission part 12d. According to this configuration, the second surface 20b of the printing object 20 can be sterilized. Therefore, when the printing object 20 is used as a packaging material, the sterilized second surface 20b of the packaging material is a surface that comes into contact with the packaging object, so that the packaging object is contaminated with various germs. Can be prevented.
In particular, the transmission portion 12d extends in a direction crossing the conveyance path, and specifically extends over the entire width direction of the print target 20. The ultraviolet light from the first light source 40 is applied to the second surface 20b of the print target 20 through the transmission part 12d. Therefore, the second surface 20b of the printing object 20 can be sterilized over a wide range in the width direction, specifically over the entire width direction. Therefore, it can prevent more fully that a to-be packaged object is contaminated with various germs.

  Further, the first light source 40 can be used not only for removing static electricity from the printing object 20 but also for sterilizing the second surface 20 b of the printing object 20. Therefore, the number of parts can be reduced as compared with the case where a light source is provided for each application.

  Further, the ultraviolet light from the first light source 40 is applied to the ink ejected from the print head 11 and landed on the first surface 20 a of the print object 20 through the transmission part 12 d and the print object 20. According to this configuration, in addition to the use of the first light source 40 to remove static electricity from the print object 20 and the use of sterilizing the second surface 20b of the print object 20, the first surface of the print object 20 is used. It can also be used for the purpose of curing ink landed on 20a. Therefore, the number of parts can be reduced as compared with the case where a light source is provided for each application.

  The ultraviolet light from the second light source 50 is irradiated from the side opposite to the first light source 40 to the ink ejected from the print head 11 and landed on the first surface 20 a of the print target 20. According to this configuration, the ink that has landed on the first surface 20a of the print object 20 can be irradiated with ultraviolet rays not only from the print object 20 side but also from the opposite side. Therefore, the ink that has landed on the first surface 20a of the print object 20 can be quickly cured.

  The inkjet printing apparatus 10 according to the present embodiment may further include a corona treatment device. The corona treatment device is disposed upstream of the print head 11 in the conveyance path. The corona treatment device can improve the wettability of the first surface 20a of the printing object 20 by corona discharge, and thus improve the printing quality.

  The above-described embodiments are for explaining the present invention, and do not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

  In terms of preventing the printing object 20 from vibrating in a direction perpendicular to the conveyance path, the negative pressure generating means 13 is not limited to the configuration including the negative pressure container 13a and the vacuum pump 13b. The negative pressure generating means 13 only needs to be able to generate a negative pressure between the second surface 20b of the printing object 20 and the support surface 12a of the support base 12. For example, the negative pressure generating means 13 may be configured to generate a negative pressure between the second surface 20b of the printing object 20 and the support surface 12a of the support base 12 using the venturi effect. . In this case, a gas flow path is formed in the support base 12, and the negative pressure generating means includes a supply source for supplying gas to the flow path.

  In terms of removing static electricity from the print object 20, the static elimination unit is not limited to the configuration including the first light source 40, the support 12, and the negative pressure generation unit 13. The static eliminator only needs to be able to remove static electricity from the print object 20 on the downstream side of the transport path from the print head 11. The static elimination means may be, for example, a corona discharge type static elimination device.

  In the above-described embodiment, the inkjet printing apparatus 10 is provided on the conveyance path of the conveyance apparatus 30. However, the present invention is not limited thereto, and may be provided in various apparatuses that convey the sheet-like print target 20 along the conveyance path.

  The inkjet printing apparatus 10 may be provided in a packaging apparatus. This packaging apparatus wraps an article to be packaged using the printing object 20 as a packaging material. In this case, ink jet printing is performed before packaging the packaged object. Examples of the packaged items include drugs and foods.

  The inkjet printing apparatus 10 may be used for a slitter. The slitter cuts and divides the print object 20 into a certain width and winds up the divided pieces. In this case, ink jet printing may be performed after the print object 20 is cut.

  The printing object 20 may be a sheet of paper that is cut in advance to a certain size, not a web material. Even in this case, the same effect as the above-described embodiment can be obtained.

  10: inkjet printing apparatus, 11: print head, 12: support base, 12a: support surface, 12b: through hole, 12c: opening, 12c1: first opening group, 12c2: second opening group, 12d: transmission part, 12d1 : Transmission member, 12d1a: convex portion, 12d1a1: tip surface, 12d1b: plate-like portion, 12e: long hole, 13: negative pressure generating means, 13a: negative pressure vessel, 13a1: negative pressure chamber, 13b: vacuum pump, 20: printing object, 20a: first surface, 20b: second surface, 30: conveying device, 31: unwinding unit, 32: winding unit, 40: first light source, 50: second light source, A: landing position.

Claims (8)

An inkjet printing apparatus that performs inkjet printing on a sheet-like print object being conveyed along a conveyance path,
A print head that discharges ink onto the first surface of the print object at a midpoint in the transport path;
A support base that supports a second surface opposite to the first surface of the print object, and the support surface is disposed so that the support surface faces the print head;
Negative pressure generating means for generating a negative pressure between the second surface of the printing object and the support surface of the support base,
Inkjet printing device. The support surface is formed with a plurality of openings communicating with the negative pressure generating means,
The plurality of openings are arranged so as to be displaced upstream or downstream of the transport path with respect to the print head.
The inkjet printing apparatus according to claim 1. Further comprising a static elimination means for removing static electricity from the print object downstream of the transport path from the print head;
The ink jet printing apparatus according to claim 1 or 2. A light source that generates ultraviolet rays;
The negative pressure generating means includes a negative pressure container that forms a negative pressure chamber communicating with the plurality of openings in cooperation with the support.
The light source is disposed in the negative pressure chamber;
By irradiating the second surface of the print object with ultraviolet rays from the light source through the plurality of openings, static electricity is removed from the print object.
The inkjet printing apparatus according to claim 2. The plurality of openings includes an opening group located downstream of the transport path from the print head,
Irradiating the second surface of the print object with ultraviolet rays from the light source through the aperture group;
The ink jet printing apparatus according to claim 4. The support base includes a transmission part capable of transmitting ultraviolet rays,
By irradiating the second surface of the print object with ultraviolet rays from the light source through the transmission part, the second surface of the print object is sterilized.
The ink jet printing apparatus according to claim 4 or 5. The ink is an ultraviolet curable ink that is cured by ultraviolet rays,
The printing object is capable of transmitting ultraviolet rays,
The transmission part is located downstream of the transport path from the print head,
By irradiating the ink ejected from the print head and landed on the first surface of the print object with ultraviolet rays from the light source through the transmission part and the print object, the print object. Curing the ink landed on the first surface of
The ink jet printing apparatus according to claim 6. A second light source that is provided separately from the first light source as the light source and generates ultraviolet rays;
The ink ejected from the print head and landed on the first surface of the print object is irradiated with ultraviolet light from the second light source from the side opposite to the first light source, so that the printing is performed. Curing the ink landed on the first surface of the object;
The ink jet printing apparatus according to claim 7.

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