JPH07119092A - Double-coating treatment of sheet paper - Google Patents

Abstract

PURPOSE:To obtain a high-gloss ultra-thin sheet paper having folding endurance, crack resistance, flexibility, smoothness and recyclability and disposable by easily peeling the coating layer from the base paper by the double-coating of a high-gloss sheet paper with two kinds of different coatings by a series of coating procedures to form ultra-thin coating layers. CONSTITUTION:The apparatus for the double-coating treatment of a sheet paper is composed of a paper feeder for delivering a sheet paper, a 1st gravure or flexo-coater for applying the 1st coating, a 1st heater and/or a 1st ultraviolet irradiation apparatus, a 2nd gravure coater or flexo-coater for applying the 2nd coating, a 2nd heater and/or a 2nd ultraviolet irradiation apparatus, an endless belt hot-pressing apparatus for pressing the coated paper under heating, a stacker and a transfer mechanism to successively transfer the sheet paper between the paper feeder and the stacker. In the above construction, a roller hot-pressing apparatus is used in place of the endless belt hot-pressing apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover and cover for magazines such as high-quality paper and cardboard, books such as textbooks, or packaging containers such as cartons and paper containers, and cut sheets for paper bags. Two different kinds of paints are applied by two sets of gravure coater device or flexo coater device, which are arranged in series, and each of them is heated and dried and / or UV-irradiated, so that the sheet is double-coated and high The present invention relates to a processing method for applying gloss processing.

[0002]

2. Description of the Related Art Conventionally, a sheet feeding device, a gravure coater device or a flexo coater device, a heater device, an ultraviolet irradiation device, an endless belt heating / pressing device or a roller heating / pressing device, and a stacker device are arranged in series. An apparatus for coating a sheet and performing high gloss processing, and a processing method are known, and an ultraviolet curable resin is used to irradiate ultraviolet rays as a paint for performing high gloss processing on the sheet surface of the sheet. What is hardened by curing is also known.

[0003]

However, the conventional coating apparatus for sheet and the conventional coating method are intended to apply one layer of coating material to the sheet. In this case, the sheet is processed. In order to improve the hardness and gloss of the paper, the thickness of the paint to be applied was made thicker to provide adhesion, and it was heated and pressed with a roller device etc., but it is possible to obtain the hardness by applying a thick paint. However, the hardness becomes brittle, that is, breaks and cracks are easily formed, and in recent years, the fact that recycling at the time of demanding disposal is not taken into consideration has been taken into consideration.

That is, in the conventional coating method using a device, the applied paint cannot be separated from the sheet, and when burned at the time of disposal, harmful chlorine gas or the like is generated by the applied paint. However, it has been extremely difficult to process it into an environmentally friendly sheet as it is a source of pollution.

Although double coating has been performed on sheets, a sheet feeding device, a gravure coater device or a flexo coater device, a heater device, an ultraviolet irradiation device, an endless belt heating press device or a roller heating press device. Using a series of devices up to the stacker device, a step of applying one layer of paint is carried out, and the endless belt heating pressing device or roller heating pressing device is passed through without being heated and pressed, and high gloss processing is applied to one layer. Store in the stacker device without refilling, once refill the paper sheet stored in the stacker device into the paper feeding device, replace the paint of the gravure coater device or the flexo coater device with another paint, and After performing the process of applying paint, this time heat and press with a roller heating and pressing device to coat the high gloss sheet and coat it. He had obtained a sheet of Rukoto,
It took a lot of time, time, and coordination.

Further, if the above-mentioned steps are carried out by means of a device for applying two kinds of paint separately by means of a double device, a vast space is required for disposing each device, and there is a problem. It was

[0007]

Therefore, in view of the above-mentioned problems, the present invention processes a high-gloss sheet by double-coating two kinds of coatings, which are extremely thin and different, in a series of steps. By solving the above problems, the paint can be easily peeled off from the paper even when it is discarded, and two different types of paint are used, compared to a high-gloss sheet with one layer of paint applied thickly. By coating in two layers, it is possible to obtain a very glossy sheet of high gloss that has folding resistance, split resistance, flexibility, smoothness, and recyclability. is there.

[0008]

According to a first aspect of the present invention, there is provided a double coat processing apparatus for use in the sheet double coat processing method according to the first aspect of the present invention. Gravure coater device or flexo coater device, first heater device and / or first ultraviolet irradiation device, second gravure coater device or flexo coater device for applying second paint, and second heater device And / or a second ultraviolet irradiation device, an endless belt heating and pressing device for heating and pressing, a stacker device, and a transfer mechanism for sequentially transferring sheets between the paper feeding device and the stacker device. Further, according to the configuration of claim 2, the sheet feeding device that carries out the sheet, the first gravure coater device or the flexo coater device that applies the first paint, the first heater device and / or Is a first ultraviolet irradiation device, a second gravure coater device or a flexo coater device for applying a second paint, a second heater device and / or a second ultraviolet irradiation device, and a roller heating press for heating and pressing. The apparatus, the stacker apparatus, and the transfer mechanism for sequentially transferring the sheets between the sheet feeding apparatus and the stacker apparatus are arranged.

[0009]

According to the action of claim 1 of the present invention, the sheet is carried out from the sheet feeding device to the first gravure coater device or the flexo coater device, and the first gravure coater device or the flexo coater is fed to the sheet paper. The first coating material having thermoplasticity and / or ultraviolet curing property is applied by the apparatus, and the sheet coated with the first coating material is heated and dried by the first heater device and / or the first ultraviolet irradiation device. And / or UV-irradiated, coated with the first coating material, heat-dried and / or UV-irradiated to the second sheet having a second gravure coater device or a flexo coater device and having thermoplasticity and / or UV curability. The coating material of No. 2 is applied, and the sheet coated with the second coating material is heated and dried and / or irradiated with ultraviolet rays by a second heater device and / or a second ultraviolet irradiation device,
Sheets heat-dried and / or UV-irradiated by the second heater device and / or the second UV irradiation device are heated and pressed by the endless belt heating and pressing device, and then heated and pressed by the endless belt heating and pressing device. Sheets are stacked and stored in a stacker device, and the sheets are sequentially transferred by a transfer mechanism.

According to the second aspect of the present invention, the sheet is carried out from the sheet feeding device to the first gravure coater device or the flexo coater device, and the first gravure coater device or the flexo coater is placed on the sheet. A first coating material having thermoplasticity and / or UV-curing property is applied by a device, and a first heater device and / or a sheet on which the first coating material is applied;
Alternatively, the second gravure coater device or the flexo coater device is used to heat-dry and / or ultraviolet-irradiate the sheet by applying the first coating material and heat-dry and / or ultraviolet-irradiate the sheet to the sheet. A second coating material having thermoplasticity and / or ultraviolet curing property is applied, and the sheet coated with the second coating material is dried by heating with a second heater device and / or a second ultraviolet irradiation device. Ultraviolet irradiation, heating and drying with the second heater device and / or the second ultraviolet irradiation device, and / or heating and pressing with UV irradiation to the sheet with roller heating and pressing device, and heating and pressing with roller heating and pressing device The stacked sheets are stacked and stored in a stacker device, and each of them is sequentially transferred by a transfer mechanism.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings of the embodiments.

FIG. 1 is a schematic explanatory view of an apparatus used for a sheet double coating method according to an embodiment of the present invention, and FIG. 2 is used for a sheet double coating method according to a next embodiment of the present invention. It is a schematic explanatory drawing of an apparatus.

The present invention is directed to magazines such as high-quality paper and cardboard, covers and covers for books such as textbooks, or cartons.
Two different kinds of paints are applied by two sets of a gravure coater device or a flexo coater device, which are arranged in series, on a packaging container such as a paper container, a sheet 1 cut for a paper bag, and each of them is dried by heating and drying. And / or a method for double-coating the sheet 1 by irradiating it with ultraviolet rays and performing high-gloss processing. The present invention according to claim 1 cuts a sheet into a predetermined size before processing. A sheet feeding device 2 that carries out the sheet 1, a first gravure coater device or a flexo coater device 4 that applies the first paint 3, a first heater device 5 that heats and dries, and / or an ultraviolet ray irradiator. 1 ultraviolet irradiation device 6, a second gravure coater device or a flexo coater device 8 for applying a second coating material 7, a second heater device 9 for heating and drying, and / or an irradiation of ultraviolet light An ultraviolet irradiation unit 10, and the endless belt heated pressure device 11A for heating the pressing, the stacker device 12 for storing a stack of sheet 1 after the processing,
A sheet 1 is provided between the sheet feeding device 2 and the stacker device 12.
Using a double coat processing apparatus provided with a transfer mechanism 13 for sequentially transferring the sheet, the step of discharging the sheet 1 from the sheet feeding apparatus 2 to the first gravure coater apparatus or the flexo coater apparatus 4, The paper 1 is thermoplastic and / or thermoplastic with the first gravure coater device or flexo coater device 4.
Alternatively, a step of applying a first coating material 3 having an ultraviolet curing property, and heating the sheet 1 coated with the first coating material 3 with a first heater device 5 and / or a first ultraviolet irradiation device 6. A step of drying and / or irradiating with ultraviolet rays, and a sheet 1 on which the first coating material 3 is applied and dried by heating and / or irradiating with ultraviolet rays is thermoplastic and / or thermoplastic with a second gravure coater device or a flexo coater device 8. Alternatively, a step of applying a second coating material 7 having ultraviolet curability, and heating the sheet 1 coated with the second coating material 7 with a second heater device 9 and / or a second ultraviolet irradiation device 10. A step of performing drying and / or ultraviolet irradiation, and a second heater device 9 and / or a second heater device 9
Endless belt heating and pressing device 11 to the sheet 1 that has been heated and dried and / or irradiated with ultraviolet light by the ultraviolet irradiation device 10 of FIG.
A step of heating and pressing by A, a step of stacking the sheets 1 heated and pressed by the endless belt heating and pressing device 11A in the stacker device 12 and storing the same are carried out while sequentially transferring the respective steps by the transfer mechanism 13. It is a thing.

According to the second aspect of the present invention, a sheet feeding device 2 for delivering the unprocessed sheet 1 cut into a predetermined size,
A first gravure coater device or flexo coater device 4 for applying the first paint 3, a first heater device 5 for heating and drying, and / or a first ultraviolet irradiation device 6 for irradiating ultraviolet light, and a second paint. Second gravure coater device or flexo coater device 8 for applying 7, a second heater device 9 for heating and drying and / or a second ultraviolet light irradiating device 10 for irradiating ultraviolet rays, and a roller for heating and pressing with a pair of rollers. The heating and pressing device 11B and the processed sheet 1
A stacker device 12 for stacking and storing the sheets and a double coat processing device provided with a transfer mechanism 13 for sequentially transferring the sheet 1 between the paper feed device 2 and the stacker device 12 are used to feed the paper feed device. A step of discharging the sheet 1 from 2 to the first gravure coater device or the flexo coater device 4, and a thermoplastic and / or UV curable property to the sheet 1 by the first gravure coater device or the flexo coater device 4. The step of applying the first coating material 3 having the above, and the sheet 1 coated with the first coating material 3 is heated and dried by the first heater device 5 and / or the first ultraviolet irradiation device 6 and / or The step of irradiating with ultraviolet rays, and the sheet 1 on which the first coating material 3 has been applied and which has been heated and dried and / or which has been irradiated with ultraviolet rays is subjected to thermoplasticity with a second gravure coater device or flexo coater device 8. Alternatively, a step of applying a second coating material 7 having ultraviolet curability, and heating the sheet 1 coated with the second coating material 7 with a second heater device 9 and / or a second ultraviolet irradiation device 10. Drying and / or UV irradiation, and heating by the second heater device 9 and / or the second UV irradiation device 10 and / or heating by the roller heating pressing device 11B to the sheet 1 that has been UV-irradiated. The step of pressing, the step of stacking and storing the sheets 1 heated and pressed by the roller heating and pressing device 11B in the stacker device 12, and the respective steps are sequentially carried out by the transfer mechanism 13.

That is, as shown in FIGS. 1 and 2, the apparatus for carrying out the double-coating method of the sheet 1 of the present invention is a sheet of high quality paper, cardboard or the like cut into a predetermined size. 1 is stacked and stored in the paper placing table 2a of the paper feeding device 2,
As the paper placing table 2a is raised, one sheet is automatically supplied to the conveyor 13a.

A powder removing device (not shown) is provided at the supply port of the paper feeding device 2, and the powder removing device is provided by passing the sheet 1 between a pair of upper and lower brush rolls. The powder adhering to the front surface or the back surface of the sheet 1 is removed, and the removed powder is collected by a dust collector (not shown) provided with a vacuum suction port.

The sheet 1 which has passed through the powder removing device and placed on the conveyor 13a is subjected to corona discharge treatment to improve the wettability and adhesion of the surface, and the first gravure coater device or the flexo coater device 4 Be transferred to.

In the first gravure coater device or flexo coater device 4, the first paint 3 is applied to the sheet 1, and the first paint 3 is filled in the paint tank 3a having an open top. A flesh-rolling roller 4a is rotatably provided in contact with the first paint 3 in the paint tank 3a, and the gravure or flexo cylinder 4b contacts the flesh-rolling roller 4a. An impression cylinder 4c is in contact with the impression cylinder 4c, and a clipper 4d is provided to the impression cylinder 4c. The clipper 4d clamps the front end of the sheet 1 to rotate the impression cylinder 4c to rotate the gravure or flexo cylinder 4b. The first paint 3 is applied to the surface of the sheet 1 by passing between
A doctor 4e is in contact with the gravure or flexo cylinder 4b, and only the paint in the non-image area is slid by the doctor 4e.

The first paint 3 to be applied according to the present invention, and
The second coating material 7 described later is a coating material having high adhesiveness, and has both thermoplasticity and ultraviolet curability, or has one of the characteristics.

Next, the sheet 1 coated with the first paint 3 by the first gravure coater device or the flexo coater device 4 is released from the clip 4d of the impression cylinder 4c, and the plurality of gears 13b as the transfer mechanism 13 are provided. The clip mechanism 13d is wound around the outer periphery of the endless chain 13c and is transferred to the endless chain 13c stretched around the endless chain 13c.
The first heater device 5 that is sandwiched between the first heater device 5 and the first heater device 5 that heats and dries, and the first ultraviolet irradiation device 6 that irradiates ultraviolet rays are transferred to the lower part.

The first heater device 5 and the first ultraviolet irradiation device 6 of the present invention, and the second heater device 9 described later.
The second ultraviolet irradiation device 10 and the second ultraviolet irradiation device 10 may be provided with either one or the other, and are selected according to the coating material 3.7 to be applied. Known UV lamp (not shown)
Is provided to cure each paint 3.7 by radiating ultraviolet rays, and each heater device 5.9 radiates heat with hot air or an electric heater, so that each paint 3.7 is cured. To cure the paint 3.7 in a stable state by either or both means, and during transfer of the cured sheet 1 to the next step. In order to prepare for the step (1), it is not hindered to provide a humidifying device (not shown) for supplying appropriate moisture to the sheet 1 if necessary.

At least one gear 13b of the transfer mechanism 13 including the plurality of gears 13d and the endless chain 13c is close to the starting end of the second gravure coater device or the flexo coater device 8 for applying the second paint 7. The sheet 1 on which the first paint 3 has been applied and which has been cured in a stable state is provided with a mechanism similar to that of the first gravure coater device or the flexo coater device 4. The second gravure coater device or the flexo coater device 8 is transferred to the second gravure coater device 8 or the flexo coater device 8, and the second paint 7 is applied to the second gravure coater device or the flexo coater device 8 or the second heater device. 9 and / or the second ultraviolet irradiation device 10 for irradiating the ultraviolet light has the same structure and operation as the above-mentioned first device, and the transfer mechanism 13 is also plural. Gear 13d, and described here for the endless chains 13c, a clip mechanism 13d is also similarly omitted.

The second paint 7 forms a high-gloss surface and a smooth surface on the surface, and is selected from suitable paints having these material characteristics and thermoplasticity, ultraviolet curability and the like. To do.

Next, according to the present invention of claim 1, the second paint 7 is used.
The sheet 1 coated with and cured is the first heating roll 11A.
a and the second heating roll 11Ab are arranged parallel to each other in the front-rear direction and spaced apart from each other, and are arranged in front of and behind the endless belt heating / pressing device 11A in which metal endless belts 11Ac each having a mirror surface are stretched around their outer circumferences. Known endless belt conveyor device 13e. 13e is transferred to the endless belt heating / pressing device 11A by the transfer mechanism 13 and the heat is transferred from the first heating roll 11Aa and the second heating roll 11Ab having a heat source built therein to the endless belt 1
1Ac is heated and rotated together with the lower receiving roller 11Ad to press and heat the double-coated sheet 1 to finish it with high gloss.

In the second aspect of the present invention, instead of the endless belt heating / pressing device 11A, a roller heating / pressing device 11B is used. The roller heating / pressing device 11B includes a pair of upper and lower rollers 11Ba. With 11Bb, it is heated and pressed to give a high gloss finish.
An electric heater or a heat source (not shown) such as steam is provided inside the upper heating roller 11Ba,
A roller 13f. Which rotates together with the lower receiving roller 11Bb and stretches the endless belt conveyor 13e. 13f
The transfer mechanism 13 transfers the transfer mechanism 13 automatically or forcibly to the stacker device 12 for stacking and storage.

Each transfer mechanism 13 and the roller 4
a. 4b. 4c. 8a. 8b. 8c. 11Aa. 11A
b. 11 Ac. 11Ba. 11Bb and the like are all adjusted in speed so as to convey the sheet 1 at a constant speed, and the sheet 1 never overlaps.

According to the present invention, the step of discharging the sheet 1 from the sheet feeding device 2 to the first gravure coater device or the flexo coater device 4 → the sheet 1 to the first gravure coater device or the flexo coater device 4 Step of applying the first coating material 3 having thermoplasticity and / or UV curing property → the first heater device 5 to the sheet 1 coated with the first coating material 3
And / or heat-drying and / or UV-irradiating with the first UV-irradiating device 6 → the second gravure coater device to the sheet 1 coated with the first paint 3 and heat-dried and / or UV-irradiating Alternatively, a step of applying the second coating material 7 having thermoplasticity and / or UV curing property with the flexo coater device 8 → second to the sheet 1 coated with the second coating material 7
Of heating and drying and / or UV irradiation by the heater device 9 and / or the second UV irradiation device 10 of the above → heating and drying and / or UV irradiation by the second heater device 9 and / or the second UV irradiation device 10. The step of heating and pressing the sheet 1 subjected to the heating with the endless belt heating and pressing device 11A → the step of stacking and storing the sheets 1 heated and pressed by the endless belt heating and pressing device 11A in the stacker device 12 The steps are sequentially carried out by the transfer mechanism 13 to obtain the high-gloss double-coated sheet 1.

Further, a step of carrying out the sheet 1 from the sheet feeding device 2 to the first gravure coater device or the flexo coater device 4 → the sheet 1 is thermoplastic by the first gravure coater device or the flexo coater device 4. And / or a step of applying the first coating material 3 having ultraviolet curability → heating the sheet 1 coated with the first coating material 3 with the first heater device 5 and / or the first ultraviolet irradiation device 6. Step of drying and / or irradiating with ultraviolet rays → The sheet 1 coated with the first coating material 3 and dried by heating and / or irradiated with ultraviolet rays is thermoplastic and / or thermoplastic with a second gravure coater device or a flexo coater device 8. Step of applying the second coating material 7 having ultraviolet curing property → second to the sheet 1 coated with the second coating material 7
Of heating and drying and / or UV irradiation by the heater device 9 and / or the second UV irradiation device 10 of the above → heating and drying and / or UV irradiation by the second heater device 9 and / or the second UV irradiation device 10. The step of heating and pressing the sheet 1 that has been heated by the roller heating and pressing device 11B to the sheet 1 that has been heated and pressed by the roller heating and pressing device 11B is stored in the stacker device 12 by stacking them. This is carried out while sequentially transferring by the transfer mechanism 13 to obtain the high-gloss double-coated sheet 1.

[0029]

The present invention has the above-mentioned structure and operation.
The sheet is coated with two different paints by a series of two sets of gravure coater apparatus or flexo coater apparatus, respectively, and the sheet is double-coated by heating and drying and / or UV irradiation. Since it has been subjected to high gloss processing, it is easy to peel off the paint from the paper even when discarding it, and two different types of paint are coated in two layers compared to high gloss sheet paper with one paint thickly applied By doing so, an epoch-making double coat of ultra-thin, which has folding resistance, split resistance, flexibility, smoothness, and recyclability, is obtained. It is a processing method, is highly efficient, and can be implemented in a compact arrangement.
It has an extremely high and meaningful effect.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an apparatus used for a double coat processing method for sheets according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory view of an apparatus used for a sheet double coating method according to a next embodiment of the present invention.

[Explanation of symbols]

1 sheet of paper 2 paper feeding device 2a paper placing table 3 first paint 3a paint tank 4 first gravure coater device or flexo coater device 4a inking roller 4b gravure or flexo cylinder 4c impression cylinder 4d clipper 4e doctor 5 first Heater device 6 First ultraviolet irradiation device 7 Second paint 8 Second gravure coater device or flexo coater device 8a Meat roller 8b Gravure or flexo cylinder 8c Pressure drum 8d Clipper 8e Doctor 9 Second heater device 10 Second ultraviolet irradiation device 11A Endless belt heating and pressing device 11Aa First heating roller 11Ab Second heating roller 11Ac Endless belt 11Ad Receiving roller 11B Roller heating and pressing device 11Ba Heating roller 11Bb Receiving roller 12 Stacker Device 13 Transfer mechanism 13a Conveyor 13b Gear 13c Endless chain 13d Clip mechanism 13e Endless belt conveyor 13f Roller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location D21H 19/24 23/70 (72) Inventor Douzo Teruyuki 37-2 Sasamekita-cho, Toda City, Saitama Stock Company Totsuya Saitama Factory

Claims (2)

[Claims] 1. A paper feeding device for carrying out unprocessed sheets cut into a predetermined size, a first gravure coater device or a flexo coater device for applying a first paint, and a first heat drying device. Heater device and / or a first ultraviolet irradiation device for irradiating ultraviolet rays, a second gravure coater device or a flexo coater device for applying a second paint, and a second heater device and / or ultraviolet rays for heating and drying. A second ultraviolet irradiation device for irradiating, an endless belt heating and pressing device for heating and pressing, a stacker device for stacking and storing the processed sheets, and a sheet between the sheet feeding device and the stacker device. Using a double coat processing device provided with a transfer mechanism for sequentially transferring,
Of transporting the sheet to the gravure coater apparatus or flexo coater apparatus, and applying the first coating material having thermoplasticity and / or UV curing property to the sheet with the first gravure coater apparatus or flexo coater apparatus And a step of heating and drying the sheet coated with the first paint with a first heater device and / or a first ultraviolet irradiation device and / or irradiating with ultraviolet light, and applying the first paint. To heat-dried and / or UV-irradiated sheet 2
A step of applying a second coating material having thermoplasticity and / or an ultraviolet curability with a gravure coater apparatus or a flexo coater apparatus, and a second heater apparatus and / or a sheet coated with the second coating material. A step of heating and drying and / or irradiating ultraviolet rays with a second ultraviolet irradiation device, and an endless belt to a sheet that has been heated and dried and / or ultraviolet irradiation with a second heater device and / or second ultraviolet irradiation device A step of heating and pressing with a heating and pressing device, a step of stacking and storing the sheets heated and pressed with an endless belt heating and pressing device in a stacker device, and performing each of the steps while sequentially transferring them with a transfer mechanism. Characteristic sheet double coating method. 2. A paper feeding device for carrying out unprocessed sheets cut into a predetermined size, a first gravure coater device or a flexo coater device for applying a first paint, and a first heat drying device. Heater device and / or a first ultraviolet irradiation device for irradiating ultraviolet rays, a second gravure coater device or a flexo coater device for applying a second paint, and a second heater device and / or ultraviolet rays for heating and drying. A second ultraviolet irradiation device for irradiating, a roller heating and pressing device for heating and pressing with a pair of rollers, a stacker device for stacking and storing the processed sheets, and a sheet between the sheet feeding device and the stacker device. The sheet is conveyed from the paper feeding device to the first gravure coater device or the flexo coater device using a double coat processing device provided with a transfer mechanism for sequentially transferring the paper sheets. And a step of applying a first paint having thermoplasticity and / or UV curability to the sheet with a first gravure coater device or a flexo coater device, and a sheet to which the first paint is applied A step of heating and drying and / or irradiating ultraviolet rays on a sheet with a first heater device and / or a first ultraviolet irradiating device, and a sheet on which a first paint is applied and dried by heating and / or ultraviolet irradiation A second gravure coater device or a flexo coater device to apply a second coating material having thermoplasticity and / or UV curing property, and a second heater device to the sheet coated with the second coating material. And / or a step of heating and / or irradiating with an ultraviolet ray with a second ultraviolet ray irradiation device,
A step of heating and pressing a sheet heated and dried and / or an ultraviolet ray irradiated by a second heater device and / or a second ultraviolet irradiation device with a roller heating pressing device, and a sheet heated with a roller heating pressing device A method for double-coating a sheet, comprising the steps of stacking and storing the sheets on a stacker device and performing the steps while sequentially transferring the steps by a transfer mechanism.