JP2000218214A - Printing or coating method for vessel and printing or coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable effectively performing various kinds of works such as preheating before printing or coating, or heating and drying after printing or coating in a short time without polluting working environment by volatile ink or coating materials by subjecting the surfaces of vessels to corona discharge treatment before performing printing or coating on the surfaces. SOLUTION: When vessels 1, for example, empty cans for canned foods are put on support bodies 21, while they are intermittently moved with the traveling of a conveying body 20 in the direction of the arrow (a), they are passed through a corona discharge treatment device 30, a preheater 3, a printing or coating part 4, and a heater 5 in this order. In this case, the corona discharge treatment device 30 is arranged on this side of the preheater 3 in the conveying direction. When high voltage is applied to opposite two electrodes, discharge is made to take place between the two electrodes, thereby generating arc to create corona discharge with ions having high energy by the created arc. When this corona discharge is blown to the vessels 1 to expose the surfaces of the vessels 1 to corona, wettability of the surface is increased to improve adhesive strength of ink or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a printing machine to automatically print or paint on empty containers filled with food or industrial products, or filled containers filled with them. The present invention relates to a printing or coating method and a printing or coating apparatus for performing printing.

[0002]

2. Description of the Related Art Cans, bottles,
The surface of containers such as barrels and boxes are printed with company names, product names, parts names, decorative patterns and designs, company logos, cooking instructions, etc., and for various purposes such as corrosion prevention and decoration Paint has been painted.

[0003] There are various shapes such as a flat surface, a spherical surface, and a curved surface on a printing surface or a painting surface of a container to be printed or painted.
There are also products made of various materials such as resin, pottery, glass, rubber, wood, bamboo, leather, and stone. For printing on these containers, existing screen printing machines, pad printing machines, roller printing machines and the like are used. The printing presses include a single type that is independent and a continuous type that includes various functions in series.

[0004]

When printing or painting using the various printing machines as described above, the container is placed in a heating furnace before printing or painting and is preheated, or is put in the heating furnace after printing. In some cases, printed or painted printing ink or paint may be heated and dried. In this case, many containers have to be arranged in trays or plate materials and put in and out of the heating furnace, which is troublesome. In addition, the containers may come into contact with each other due to vibration when they are put into or taken out of the heating furnace, and the coating of the containers may be peeled off, or the printed characters and figures may be rubbed and blurred before drying, or the paint or printing ink of the containers may become unclear. To the container and the container may become dirty. Another problem is that a heating device or a heating pot must be installed near the printing device separately from the printing machine, so that a large installation space is required.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to perform various operations such as preheating before printing or painting, and heating and drying after printing or painting on a line in a series, in a short time, efficiently and automatically. The printing and painting finish is good, there is almost no waste of ink and paint during printing and painting, the working environment is not polluted by volatile ink and paint, and the printing or painting equipment can be downsized. An object of the present invention is to provide a printing or coating method and an apparatus therefor that can solve the above-mentioned problems of the conventional method.

According to a first aspect of the present invention, there is provided a printing or coating method in which the surface of a container is subjected to a corona discharge treatment, and thereafter, the surface is printed or coated.

According to a second aspect of the present invention, there is provided a printing or coating method in which the surface of the container is subjected to a corona discharge treatment before or after the container is preheated, and thereafter the surface is printed or painted.

According to a third aspect of the present invention, there is provided the printing or coating method according to the first or second aspect, wherein the printing or coating is performed on the container, and then the printed or coated surface is subjected to corona discharge treatment. Alternatively, it is a method of printing or painting over a painted surface.

According to a fourth aspect of the present invention, there is provided a printing or coating method according to any one of the first to third aspects, wherein the container is a filled container filled with contents, and the printing or the coating is performed. And drying the printed ink or paint and heating the contents in the container.

A printing or painting method according to a fifth aspect is the printing or painting method according to any one of the first to third aspects, wherein the printing or painting is a non-spray method.

According to a sixth aspect of the present invention, there is provided a printing or coating apparatus comprising: a conveying device for conveying a container; a corona discharge processing device for corona discharging a surface of the container conveyed by the conveying device;
It is a device provided with a printing or painting part for printing or painting on a surface subjected to corona discharge treatment.

According to a seventh aspect of the present invention, there is provided a printing or coating apparatus comprising: a conveying device for conveying a container; a preheating device for preheating the container conveyed by the conveying device before printing; and a printing ink or a coated paint printed on the container. And / or a heating device for heating and drying the preheating device and / or the heating device is a high-frequency heating system, the preheating device is located closer to the transport direction than the printing or painting section, and the heating device is printed. Alternatively, it is a device that is disposed further in the transport direction than the coating unit.

An eighth aspect of the present invention is a printing or painting apparatus according to the seventh aspect, further comprising a corona discharge treatment device for performing a corona discharge treatment on the surface of the container carried by the carrying device.

According to a ninth aspect of the present invention, there is provided the printing or painting apparatus according to any one of the sixth to eighth aspects, wherein two or more printing or painting sections are provided, and the printing or painting section in the forward direction in the transport direction is provided. Is a device that can be printed or painted on a container printed or painted by a printing or painting part before it, superimposed on the printing or painting, or at a place different from the previously printed or painted place. .

According to a tenth aspect of the present invention, there is provided the printing or painting apparatus according to any one of the sixth to ninth aspects, wherein two or more printing or painting parts and a heating device are provided, and each heating or heating part is provided. This is a device in which the device is provided ahead of each printing or painting unit in the transport direction.

A printing or coating apparatus according to claim 11 is the printing or coating apparatus according to any one of claims 6 to 10, wherein the direction changing mechanism for changing the direction of the container with respect to the printing or coating section during conveyance is provided. It is a device provided.

According to a twelfth aspect of the present invention, there is provided a printing or coating apparatus according to any one of the sixth to eleventh aspects, wherein the transporting apparatus transports the container, and a corona discharge for performing corona discharge treatment on the surface of the container. A processing device, a preheating device for preheating the container before printing, a printing or coating unit for printing or coating the container, a heating device for heating and drying the printing ink or the coated paint printed on the container, It is a printing or painting device incorporated in the filling line to be filled.

[0030]

(Embodiment 1) A first embodiment of a printing or painting apparatus according to the present invention will be described with reference to FIG.
This embodiment is a case where the container 1 is an empty can for canning.

The transporting device 2 shown in FIG. 1 is for transporting the container 1 and has a cylindrical support body provided with a large-diameter flange 22 on a chain (transporting body) 20 circling in the direction of arrow a in the figure. 2
A plurality of reference numerals 1 are attached so as to be rotatable in the direction of arrow b in the drawing and spaced from each other in the transport direction. When the container 1 is put on the support 21, the container 1 intermittently moves in the direction of arrow a with the traveling of the carrier 20, and the corona discharge treatment device 30.
The preheating device 3, the printing or painting unit 4, and the heating device 5 pass in this order.

The support 21 may have a structure other than that shown in the drawings. For example, in the case of supporting a container filled with contents, a plate-like one on which the container can be placed or an upper opening is provided. With a tubular shape, the lower part of the container can be inserted inside, or several claws open and close outside and inside, and when opening or closing it, a part of the container can be held from outside or inside, It is also possible to use a device that can release the holding of the container at the opposite time (hand for robot).

The printing or coating unit 4 prints a product name, a company name, a company logo mark, characters for cooking explanation, a pattern, a design, etc. on the outer peripheral surface of the container 1 conveyed by the conveying device 2 and also for preventing corrosion. It is a printing machine or a painting machine for painting for decoration, and is provided between the preheating device 3 and the heating device 5 during conveyance. This printing or painting section 4 has existing pad printing machines, screen printing machines,
A developed printing machine or the like can be used. When the surface of the container 1 is a curved surface, it is suitable to use a curved surface printing machine or a curved / planar printing machine or the like, and when the surface of the container 1 is flat, it is suitable to use a flat surface printing machine or a curved / planar printing machine.

Below the printing or painting unit 4, a belt-shaped direction changing mechanism 6 is provided along the conveying device 2. As shown in FIG. 5B, the direction changing mechanism 6 comes into contact with the side surface of the support 21 passing therethrough to rotate the flange 22 of the support 21 in the direction of the arrow b in FIG. Body 21
Is rotated to change the orientation of the container 1 with respect to the printing or coating unit 4. The direction changing mechanism 6 includes the support 2
It is also possible to use a motor for directly rotating the motor 1 or another mechanism or structure.

The pre-heating device 3 heats the container 1 before printing from several tens of degrees Celsius.
This is to improve the adhesion of the printing ink or the paint to be printed on the container 1 by heating to about 200 ° C., and a high-frequency heating device is used. As shown in FIG. 4, this high-frequency heating device includes a power supply section 10, an oscillation section 11, a matching section 12, and a heating section for preheating (a heating section for post-heating).
The heating unit 7 for preheating is installed before the printing or coating unit 4 in the transport direction of the container 1. The power supply unit 10 is independent of a heating device main body 14 including an oscillation unit 11, a matching unit 12, and a heating unit 7 (8) for preheating or post-heating. The preheating device 3 is a heater,
Heating by hot air, laser or the like may be used. The power supply unit 10 is a circuit that converts a three-phase, 200V alternating current into a 350V direct current and outputs the same. The power supply unit 10 adjusts the output current and voltage to desired values by a controller (not shown). Is available. The oscillating unit 11 has a DC voltage of 350 V output from the power unit 10.
Is converted into a high frequency of about 50 KHz to several MHz. The high frequency output from the oscillating unit 11 is subjected to impedance matching by a matching unit (also referred to as a matching unit) 12 and further output from the matching unit 12. Heating section 7 for preheating or postheating with high frequency ring
(8).

The heating device 5 heats the container 1 after printing or coating to several tens to several hundreds degrees C., for example, about 250 ° C., to dry and harden the printing ink or paint printed on the container 1. belongs to. If the container 1 is filled with food (food, beverage, etc.), the heating device 5
By heating the container 1, the food in the container 1 can be boiled, boiled, and sterilized. As the heating device 5, a high-frequency heating device similar to the preheating device 3 can be used. The heating unit 8 for post-heating of the heating device 5 is arranged ahead of the printing or coating unit 4 in the transport direction of the container 1. As the heating device 5, a device heated by a heater, hot air, laser, or the like can be used.

The corona discharge treatment device 30 shown in FIG. 1 is disposed before the preheating device 3 in the transport direction. The corona discharge treatment device 30 is for treating the surface of the container 1 with corona discharge. An existing device can be used as the corona discharge treatment device 30. As an example of an existing corona discharge treatment device, when a high voltage (for example, 12 kV) generated from a high-frequency high-voltage device is supplied to two electrodes facing each other, a discharge occurs between the two electrodes, and 50 to 60 cycles per second. An arc is generated, and when air is blown on the arc, the arc swells and spreads out of the head. The spread and strength of the arc depend on the voltage applied to the electrodes, the flow of air, the shape of the electrodes, and the like. The generated arc creates a corona discharge with high energy ions. When this corona discharge is sprayed on the container 1 and the surface of the container 1 is exposed to the corona, functional groups having various polarities such as carbonyl groups are generated on the surface, increasing the wettability of the surface, and increasing the ink, adhesive, coating, and the like. The adhesion strength of the agent and the like is greatly improved.

Printing or painting by the printing or painting apparatus shown in FIG. 1 is performed, for example, as follows. . The container 1 is set on the moving support 21 manually or by a robot. . The set container 1 is intermittently or continuously moved to the preheating heating unit 7 side with the movement of the support 21, and temporarily when the first container 1 comes directly below the heating unit 7. The support 21 stops, and the container 1 stops just below the heating unit 7. . The heating unit 7 for preheating descends from above the stopped container 1 and covers the outer periphery of the container 1. The power supply unit 10 (FIG. 4) of the high-frequency heating device is turned on, and the container 1 is turned on by the heating unit 7. High frequency heating. The heating temperature in this case is several tens to several hundreds degrees Celsius, for example, 30
It is chosen around 0 ° C. . When the preheating of the container 1 is completed, the heating unit 7 for preheating rises and comes off the container 1, the support 21 resumes its movement, and the preheated container 1 is conveyed to the printing or painting unit 4 and stopped there. . During this time, the individual supports 21 are repeatedly moved, stopped, and moved, and the second and subsequent containers 1 are sequentially preheated by the preheating heater 7. The method of heating the container by the heating unit 7 for preheating may be another method. For example, the container 1 may be moved down without moving the heating unit 7 up or down, or the container 1 and the heating unit 7 may not be moved up and down. Alternatively, the heating unit 7 may be opened and closed, and the heating unit 7 may be detached from the container 1 by opening and closing the heating unit 7. . The container 1 stopped immediately in front of the printing or painting unit 4 is rotated in the direction of the arrow b in FIG. 1 by the direction changing mechanism 6, and is printed on the outer peripheral surface of the container 1 with printing ink by the printing or painting unit 4, or used for decoration. A paint for the purpose of preventing corrosion or corrosion is applied. . When the printing or coating on the container 1 is completed, the support 21 moves again, and the printed or coated container 1 is conveyed to the heating unit 8 for post-heating, in the same manner as in the preheating in the heating unit 7 for preheating. The container 1 is heated by high frequency, and the printing ink or paint previously printed or coated on the container 1 is dried and cured.

(Embodiment 2) A printing or coating apparatus according to a second embodiment of the present invention will be described with reference to FIG. The basic configuration of the printing or painting apparatus shown in FIG. 2 is the same as that shown in FIG. The difference is the first between the two printing or painting parts 4
That is, a second heating unit 8 for post-heating is provided ahead of the second printing or coating unit 4 in the transport direction. First and second heating units 8 and heating device 5
Are the same as those shown in FIG.

In the printing or coating apparatus shown in FIG. 2, when the first printing or coating on the container 1 by the printing or coating unit 4 in the conveying direction is completed, the support 21 is moved and the container 1 is moved.
Is moved to the first post-heating heating unit 8 side, and temporarily stopped when the container 1 comes directly below the heating unit 8, where the container 1 is subjected to high-frequency heating by the heating unit 8 to perform first-stage printing. Alternatively, the printing ink printed by the coating unit 4 or the coated paint is dried and cured. After a predetermined time, the support 21
Resumes the movement, the container 1 is moved to the printing or painting section 4 side in the conveying direction, and when the container 1 comes in front of the printing or painting section 4 at the subsequent stage, the conveying device 2 is temporarily stopped again, and The second printing or painting by the printing or painting unit 4 at the subsequent stage is performed. This second printing or painting may be printed or painted on top of the previously printed or painted printing ink or paint, and may be printed or painted in a place different from the previously printed or painted place. It may be done. When the second printing or coating is completed, the container 1 is moved to the second post-heating heating unit 8 side by the resumption of the movement of the support 21, and the container 1 is heated by high-frequency heating to the container 1 The printed or painted ink or paint dries and cures.

(Embodiment 3) A printing or painting apparatus according to a third embodiment of the present invention will be described with reference to FIG. The basic configuration of the printing or painting apparatus shown in FIG. 3 is the same as that shown in FIG. The difference is that the heating unit 7 for preheating of the preheating device 3 and the heating unit 8 for post-heating of the heating device 5 are formed in a tunnel shape so that a plurality of containers 1 are heated and dried at a time. .

A direction changing mechanism 6 is arranged along a support 21 on the lower side of the heating section 7 for preheating of the preheating apparatus 3 and the heating section 8 for post-heating of the heating apparatus 5. The direction changing mechanism 6 on the heating unit 7 side for preheating includes a rotating wheel 26 that is rotated by a rotation driving unit 27, and the rotating wheel 26 contacts the flange 22 of the support 21 to move the support 21 in FIG. The direction changing mechanism 6 on the heating unit 8 side is a belt type, and the belt is
2, the support 21 is rotated in the direction of arrow b in FIG. Due to this rotation, the container 1 placed on the support 21 rotates in the same direction as the support 21, and the entire circumference of the container 1 passing through the tunnel-shaped preheating heater 7 is uniformly high-frequency heated, and post-heated. A desired portion of the container 1 passing through the heating section 8 for printing is directed to the printing or painting portion 4 so that the desired portion is printed or painted.

The printing or coating unit 4 is provided with three spaces between the heating unit 7 for preheating and the heating unit 8 for post-heating,
While the three containers 1 are simultaneously heated by the preheating heating unit 7, the three containers 1 preheated are simultaneously printed or painted, and the printed three containers 1 are further heated for subsequent postheating. The heating unit 8 simultaneously heats the printing ink or paint that has been printed or painted to dry and harden. In this case, the three printing or painting parts 4 can be printed at three different places of the container 1 or can be printed or painted three times on the printing ink or paint previously printed or painted. The number of printing or painting sections 4 can be any desired number other than the above, and if the third and fourth heating devices 5 are provided between the plurality of printing or painting sections 4, the carrier 20 rotates once. Printing can be performed three or more times.

The container 1 conveyed by the support 21 can be heated by both the heating units 7 and 8 while being continuously conveyed without being temporarily stopped by the heating unit 7 for preheating and the heating unit 8 for post-heating. it can. The total length of each of the heating sections 7 and 8 can be selected to a desired length other than the above. However, if the length is too long, the entire apparatus becomes large, so that the total length takes into account the demand for miniaturization of the apparatus and work efficiency. In addition, it is desirable to select a necessary and sufficient length.

(Embodiment 4) The container 1 to be printed or coated by the printing or coating method or apparatus of the present invention is not limited to the shape shown in the figure, but may be, for example, a bottle, a barrel, a box, or any other shape. , And may have a structure. Further, the material is not limited to metal, but may be any material such as resin, wood, bamboo, leather, stone, and glass. The contents filled in the container are not limited to foods and beverages, but may be industrial products and the like.

The transporting device 2 of the present invention may be other than the one shown, and for example, an existing free flow conveyor can be used. Since this conveyor can partially stop and run only at a desired location, it is easy to place containers on the conveyor and to take out containers. By the way,
Since the conventional belt conveyor stops the entirety or restarts traveling, it is difficult to accurately determine the stop position. However, the free flow conveyor does not have such a disadvantage.

Although the illustrated transfer device 2 has a square endless shape, the transfer device 2 may have a straight endless shape as shown in FIG. In this case, a large number of supports 21 as shown in FIG. 5 (a) are attached to the belt-conveyor-type carrier 20 at intervals, and the container 1 covered on the support 21 is moved to the upper traveling portion 2a of the carrier 20. The surface is preheated by a preheating device 3 provided on the side, the surface is corona-treated by a corona discharge treatment device 30, and the surface is printed or painted by a printing or painting section 4, and the printed or painted surface is subjected to the next corona discharge. The corona treatment is again performed by the treatment device 30, and the overprinting or painting is performed thereon by the next printing or the coating unit 4, and thereafter, the heating and drying is performed by the heating device 5. Transported body 2
0 rotates the lower traveling section 2b and returns to the upper traveling section 2a.

The container shown in FIGS. 1 to 3 is a device in which the container 1 is set vertically on the conveying device 2 and the container 1 is printed or painted from the side. It is also possible to set the container 1 on the transport device 2 in the horizontal direction, and to print or coat the container 1 from the side, from above or from below.

The illustrated direction changing mechanism 6 is belt-shaped, and rotates the container 1 continuously by its rotation. The direction changing mechanism 6 rotates the container 1 to uniformly heat the entire circumference. Alternatively, any other shape or structure can be used as long as the printing location can be directed to the printing or painting section 4 by changing the direction of the container 1. For example, a mechanism for rotating the container 1 horizontally by an arbitrary angle such as 90 degrees or 180 degrees, or a mechanism for rotating the container vertically by a desired angle may be used. 90 degrees horizontally or 1
When rotated by 80 degrees, printing can be performed on two or more locations in the horizontal direction of the container by one printing press.
It can be printed at two or more upper and lower locations, such as the top and bottom of the printer.

The printing or painting unit 4 includes the inside and outside of the work,
Alternatively, two or more places, such as above and below, can be provided so that they can be simultaneously printed or painted on two or more places of the container 1.

In FIGS. 1 to 3, the corona discharge treatment device 30 is provided before the preheating device 3 in the transport direction. However, the corona discharge treatment device 30 may be installed at any other location. It may be provided further in the transport direction than the preheating device 3 or may be provided both before and after the preheating device 3.

Two or more preheating devices 3, a printing or painting unit 4, a heating device 5, a direction changing mechanism 6, a corona discharge treatment device 30, and the like can be provided. You can also.

The printing ink and paint may be any as long as they easily adhere to the container. Examples of the lubricating paint include fluororesin (PTFE), molybdenum disulfide, and the like.
There are graphite, mica and the like.

In the printing or coating apparatus of the present invention, the transport device 2 for transporting the container 1, the corona discharge treatment device 30, the preheating device 3, the printing or coating unit 4, and the heating device 5 fill the container 1 with the contents. It can be incorporated into a work line and printed or painted while the contents are packed in a container on one work line. In this case, the operation of filling the container 1 with the contents, the operation of sealing the container 1 with a lid, and the operation of sealing can be performed before or after printing or painting.

The printing or coating apparatus of the present invention may be provided with a cooling device. The cooling method of the cooling device may be any cooling method such as air cooling, water cooling, and cooling with another refrigerant. Further, the arrangement position of the cooling device can be determined according to the application. The cooling device is used to cool the heat-dried container and then removed from the transfer device 2 by hand or by a robot, or without dispensing from the transfer device 2, such as a distribution line or packaging connected to the transfer device 2. It can be fed directly into the line, improving work efficiency.

[0070]

The printing or coating method according to claims 1 to 3 has the following effects. 1. Since the surface of the container is subjected to corona discharge treatment, the adhesion (affinity) of the printing ink or paint to the surface of the container is increased, and the adhesion of the ink and the paint is ensured. 2. If the container is made of metal, oil may adhere to the surface, and if printing or painting is performed as it will cause the ink or paint to peel off, conventionally prepare equipment to remove the oil. In the present invention, the oil has to be removed by the corona discharge treatment. Therefore, it is not necessary to provide a cleaning facility for removing the oil or to perform the cleaning work as in the conventional case. 3. If the container is made of resin, the release agent may be attached to the surface, and if printing or painting as it is, it will cause peeling, so conventionally preparing equipment to remove the release agent Although it was necessary to perform the removing operation, in the present invention, since the stripping agent is removed by corona discharge treatment, it is not necessary to provide a cleaning facility for removing the stripping agent as in the related art, and it is not necessary to perform the cleaning operation. There is no.

In the printing or painting method according to the third aspect, after printing or painting on the container, the printed or painted surface is subjected to corona discharge treatment and printed or painted over the printed or painted surface. In addition, there is also an effect that even when coating is performed twice or more times, the adhesion between the ink and the paint in the upper and lower layers is ensured and strong.

In the printing or coating method according to the fourth aspect, the printed or coated container is heated to dry the printing ink or paint and the contents in the container are subjected to heat treatment. By heating the filled or packed container, the food can be boiled, boiled and sterilized.

In the printing or coating method according to the fifth aspect, since the printing or coating is of a non-spray type, the following effects are obtained. 1. The ink and the paint do not fly into the air, and the working environment is not contaminated by the ink or the paint or contributes to pollution. 2. Since ink and paint do not fly into the air, there is no waste of ink or paint. By the way, when spraying, about 80% of the mist-like ink or paint sprayed from the spray scatters in the air and only about 20% adheres to the container, so that there is much waste of ink and paint. 3. A duct and exhaust device were installed to discharge ink and paint scattered in the air to the outside of the room, and a filter was installed to purify the discharged ink and paint. There is no.

Since the printing or coating apparatus according to the sixth aspect is provided with a corona discharge treatment device, if the surface of the container is subjected to corona discharge treatment, the adhesion of ink or paint to the surface can be ensured. After printing or painting on the container, the printed or painted surface is subjected to corona discharge treatment, and if it is printed or painted over the printed or painted surface, the ink or Adhesion between paints becomes reliable and strong.

The printing or coating apparatus according to the seventh aspect of the present invention is provided with a preheating apparatus and a heating apparatus, and furthermore, has a high frequency heating system, and has the following effects. 1. Since the printing ink and paint do not ignite due to the heat of the preheating device or heating device, these devices can be installed on the side of the printing or painting unit, making it possible to reduce the size of the printing or painting device, even in a narrow space. Can be installed. 2. Since the container can be preheated, the printing ink or paint easily adheres to the container. 3. If preheating is performed immediately before applying the paint, the temperature of the container hardly decreases until the paint is applied, the temperature does not vary from container to container, and the quality of printing and coating is stabilized. 4. Since the coating applied to the container can be sufficiently dried and cured with a small heating device, a conventional large heating furnace is not required, and the printing or coating device can be further reduced in size. .

Since the printing or coating apparatus according to the eighth aspect includes the corona discharge treatment apparatus and the preheating apparatus, the effects described in both the sixth and seventh aspects can be obtained.

Since the printing or coating apparatus according to the ninth aspect is provided with two or more printing or coating parts, the printing or coating part is overlapped on the previously printed or coated printing ink or coating material, or the portion printed or coated previously. It can be printed or painted in a different place.

In the printing or coating apparatus according to the tenth aspect, not only the printing or coating section but also two or more heating apparatuses are provided, and each heating apparatus is provided ahead of each printing or coating section in the transport direction. , Each time after printing or painting,
The printing ink or the paint can be dried once, and the printing ink or the paint reliably adheres to the container.

Since the printing or coating apparatus according to the eleventh aspect is provided with the direction changing mechanism, it is possible to change the direction of the container and print or coat the desired two places of the container. In addition, since the entire circumference of the container can be uniformly preheated or subjected to corona discharge treatment, the entire surface of the container can be uniformly printed or painted.

A printing or coating apparatus according to a twelfth aspect of the present invention is a conveying apparatus for conveying a container, a corona discharge treatment apparatus for performing corona discharge treatment on the surface of the container, a preheating apparatus for preheating the container before printing, and a method for printing or coating the container. Since the printing or coating unit to be used and the heating device for heating and drying the printing ink or the coated paint printed on the container are incorporated in the work line for filling and packing the contents in the container, one work line Printing or painting can also be performed while packing the food on the container.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a printing or painting apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a printing or painting apparatus according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a printing or painting apparatus according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing one embodiment of a high-frequency heating device used as a preheating device and a heating device in the printing or coating apparatus of the present invention.

FIG. 5A is an explanatory view when a container is put on a support in the printing or coating apparatus of the present invention, and FIG. 5B is a plan explanatory view when the support is rotated by a direction changing mechanism.

FIG. 6 is a side view showing another example of the printing or coating apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Conveying device 3 Preheating device 4 Printing or coating part 5 Heating device 6 Direction conversion mechanism 30 Corona discharge treatment device

Claims (12)

[Claims] 1. A printing or coating method, wherein a surface of a container (1) is subjected to a corona discharge treatment, and thereafter, the surface is printed or coated. 2. A printing or coating method, wherein the surface of the container (1) is subjected to a corona discharge treatment before or after preheating the container (1), and thereafter the surface is printed or painted. . 3. The printing or coating method according to claim 1, wherein after printing or coating on the container (1), the printed or coated surface is subjected to a corona discharge treatment, and then the printed or coated surface is coated. A printing or painting method characterized by printing or painting on top of it. 4. The printing or coating method according to claim 1, wherein the container (1) is a filled container filled with contents, and the printed or coated container (1) is B) drying the printing ink or paint and heating the contents in the container (1) by heating. 5. The printing or painting method according to claim 1, wherein the printing or painting is of a non-spray type. 6. A transfer device (2) for transferring a container (1),
A corona discharge treatment device (30) for performing corona discharge treatment on the surface of the container (1) conveyed by the transfer device (2), and a printing or painting unit (4) for printing or painting on the corona discharge treated surface. A printing or painting device, comprising: 7. A transfer device (2) for transferring a container (1),
A preheating device (3) for preheating the container (1) conveyed by the conveying device (2) before printing, and a heating device (5) for heating and drying the printing ink or the coated paint printed on the container (1). And / or one of the preheating device (3) and the heating device (5) is of a high-frequency heating type, and the preheating device (3) is located before the printing or coating unit (4) in the transport direction. A printing or coating device, wherein the heating device (5) is arranged further in the transport direction than the printing or coating portion (4). 8. The printing or coating apparatus according to claim 7, further comprising a corona discharge treatment device (30) for corona discharge treatment of the surface of the container (1) conveyed by the conveyance device (2). Printing or painting equipment. 9. The printing or painting apparatus according to claim 6, wherein two or more printing or painting parts (4) are provided, and the printing or painting part (4) at the front in the transport direction is further provided. It is possible to print or paint on the printing or painting of the container (1) printed or painted by the printing or painting part (4) on the front side, or on a part different from the previously printed or painted part. A printing or painting apparatus characterized by the above-mentioned. 10. A printing or painting apparatus according to claim 6, wherein two or more printing or painting sections (4) and two or more heating devices (5) are provided, and ) Is provided in the conveying direction ahead of each printing or painting section (4). 11. A printing or coating apparatus according to claim 6, wherein a direction changing mechanism (6) for changing the direction of the container (1) with respect to the printing or coating section (4) during transportation. A printing or painting device, comprising: 12. A conveying apparatus (2) for conveying a container (1) in the printing or coating apparatus according to any one of claims 6 to 11, and a corona discharge treatment for a surface of the container (1). Discharge treatment device (30), preheating device (3) for preheating container (1) before printing, printing or coating unit (4) for printing or coating on container, printing ink or coating printed on container (1) A heating device (5) for heating and drying the applied paint,
A printing or coating apparatus, which is incorporated in a filling line for filling a container (1) with contents.