JPH08252898A - Decorating method for uneven paperboard - Google Patents

Abstract

PURPOSE: To provide a method for decorating a paperboard having an uneven shape with an accurate and photographic-tone multicolor design layer. CONSTITUTION: A decorated paperboard 5 in which a decorating sheet 12 is adhered to the uneven surface of the paperboard is formed by providing an adhesive layer 4 at the paperboard 3 having an uneven shape on the surface as required, so superposing that the design layer 2 of the sheet 12 provided with the design layer 2 is brought into adjacent contact with the uneven surface of the paperboard, evacuating in vacuum from the paperboard side, and pressurizing from the sheet side as required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a makeup method for a jigsaw puzzle, a plastic model, a three-dimensional model, an ornament, etc. having a three-dimensional surface shape, and more particularly to a method for painting a paperboard having an uneven surface.

[0002]

2. Description of the Related Art Conventionally, in order to construct a three-dimensional surface makeup having various picture layers on relatively thick paperboard, interleaving paper, etc., the paperboard is printed and the picture layers are provided, and then a die is used for pressing. Known as an image forming method is an ordinary printing method such as intaglio, planographic printing, letterpress printing, or stencil printing such as silk screen printing or jet printing on a paperboard that has been provided with an uneven surface by pressing or has been previously provided with an uneven surface by pressing. Has been.

[0003]

However, in the method of pressing after providing the pattern layer by printing, the ink adheres to the mold and the pattern is taken by the mold, or the surface layer of the paper is attached to the pattern. However, there is a problem of peeling between sheets, which is a problem. In addition, intaglio, planographic,
The method of printing on a paperboard provided with an uneven surface in advance by the letterpress method has a problem that the ink is difficult to transfer to the recesses and the pattern is lost. The silk screen printing and the jet printing are methods that can print on the uneven surface relatively irrelevantly, but there is a problem that it is difficult to form a pattern layer having a photographic precision.

It is an object of the present invention to provide a painting method in which a multi-color picture layer having a high degree of accuracy and a photographic tone is provided on a paperboard having an uneven surface in advance.

[0005]

In order to achieve the above object, the painting method of the present invention is a painting layer of a painting sheet in which a painting layer is provided on the concavo-convex surface of paperboard having a concavo-convex surface. And the uneven surface are overlapped with each other so that they are in contact with each other, vacuum suction is applied from the side of the paperboard, and a painting sheet is molded and pressure-bonded to the paperboard by a pressure difference to bond and integrate with the uneven surface of the paperboard. . A second invention is a painting sheet (hereinafter, referred to as a transfer sheet in the present specification) in which a transfer layer having a pattern layer on a base material sheet is provided on an uneven surface of a paperboard having an uneven shape on the surface. Are stacked so that the transfer layer and the uneven surface are in contact with each other, vacuum suction is applied from the paperboard side, and the transfer sheet is molded and pressure-bonded to the paperboard by the pressure difference to bond the transfer layer to the uneven surface of the paperboard. After that, only the base sheet is peeled and removed to provide a pattern layer. Also, if necessary, from the side of the painting sheet, pressurizing with air pressure and / or a rubber-like elastic film,
It strengthens the adhesion between the painting sheet and the corrugated paperboard.

[0006] 1 of the method of painting on the corrugated paperboard of the present invention
In the embodiment, as shown in FIG. 1, an adhesive layer 4 was applied if necessary, and the paperboard 3 having an uneven surface was placed on a pedestal 71 with the uneven surface facing upward. Next, the base material sheet 1 preheated by the heating heater 62 provided in the upper chamber 6.
The pattern layer 2 of the painting sheet 12 provided with the pattern layer 2 and the uneven portion of the paperboard 3 having the uneven shape are overlapped so as to be in contact with each other, and the lower chamber 7 is passed through the through hole 9 from the side of the paperboard.
The vacuum is applied by the vacuum source 77 provided in the above, and the sheet for painting is molded and pressure-bonded to the paperboard by the pressure difference, and laminated and integrated with the uneven surface of the paperboard to form the paperboard 5 for painting. Further, by pressurizing with air pressure from a pressure increasing / decreasing source 76 provided in the upper chamber 6 or pressing with a rubber-like elastic film 8 as shown in FIG. It can be glued.

The adhesive layer 4 of the present invention can be provided on the paperboard 3, but after the adhesive is applied to the pattern layer 2 of the painting sheet 12, the adhesive layer 4 is formed on the surface of the paperboard 3 having the uneven surface. Stack them in contact with each other, vacuum suction from the paperboard side,
It is also possible to form and press-bond a painting sheet on a paperboard by a pressure difference and laminate it on the uneven surface of the paperboard.

Another embodiment of the present invention is necessary for the base sheet 1 shown in FIG. 3 in place of the painting sheet 12 on the uneven surface of the paperboard 3 having the uneven shape as shown in FIG. A transfer sheet 2 including a release layer 21 and a transfer layer 20 having a pattern layer 2 and an adhesive layer 24 if necessary.
The transfer layer 20 of No. 6 and the concavo-convex surface of the paper board are overlapped with each other. Then, vacuum is sucked from the pressure reducing source 77 through the through hole 9 from the paperboard 3 side, and the transfer sheet 26 is formed and pressure-bonded to the paperboard by the pressure difference, and the transfer layer 20 is formed on the uneven surface of the paperboard.
After adhering, the base sheet 1 alone is peeled and removed as shown in FIG. 5 to form the painting board 5 in which the transfer layer 20 having the picture layer 2 is provided on the paperboard. In addition, the transfer sheet side is pressed by the air pressure from the pressurizing / depressurizing source 76 provided in the upper chamber 6 from the transfer sheet side, or as shown in FIGS. It is possible to bond the paperboard more closely.

The base sheet used for the painting sheet of the present invention is not particularly limited as long as it is a conventionally known thermoplastic resin or elastomer sheet. For example, as the thermoplastic resin, polyethylene terephthalate, polybutylene terephthalate, polyester including polyethylene naphthalate, polyethylene, polyolefin such as polypropylene, polyvinyl chloride,
It is a stretched or unstretched sheet of polystyrene, polyamide, polysulfone, polyphenylene sulfide, 1,4-polycyclohexylenedimethyl terephthalate, aramid, polycarbonate, polyvinyl alcohol, saponified ethylene / vinyl acetate copolymer, cellulose triacetate and the like. Also, as the elastomer,
There are natural rubber, neoprene rubber, isoprene rubber, silicone rubber, urethane elastomer, etc. The thickness is 10 to 100 μm, preferably 20 to 60 μm, depending on the type of material. When it is 10 μm or less, wrinkles are easily generated when pressure is applied, and breakage easily occurs.
If it is 0 μm or more, there is a problem that it is difficult to follow up the rise of deep unevenness. In addition, the base material sheet used for the adhesion-integrated (lamination) type painting sheet has a corona discharge treatment or a corona discharge treatment to strongly stabilize the adhesion of the printing ink on the surface of the sheet on which the pattern layer is provided, if necessary. It is also possible to provide a primer layer.

The base sheet used for the painting sheet (transfer sheet) provided with the transfer layer of the present invention may be a sheet made of the same material as that used for the lamination type painting sheet. Since the base material sheet of the transfer sheet is to be peeled off after the pattern layer is transferred to the paperboard, it is preferable from the economical point of view to make it thin as long as it does not hinder the work. Further, in the base material sheet used for the transfer sheet, a release layer and / or a release layer can be provided on the surface on which the transfer layer is provided in order to stabilize the releasability of the pattern layer. The release layer promotes releasability from the pattern layer or the release layer, and remains on the base material sheet side after transfer.
The release layer is also transferred to the paperboard together with the transfer layer, and also has a function as a surface protective film for maintaining the durability of the pattern layer. Then, the surface gloss of the transfer image can be adjusted or changed by embossing the surface of the base material sheet or by forming an uneven pattern in a pattern on the release layer.

The paperboard provided with the uneven surface is made of natural pulp including pulp obtained from waste paper which is usually used, or synthetic pulp. Then, the smoothness of the surface can be improved to apply the adhesive uniformly, or a clay coat can be applied to facilitate the adhesion with the heat-sensitive adhesive.
Further, when the thickness of the paperboard is required, interleaving paper may be used. The paperboard preferably has a thickness of 0.3 to 5 mm, preferably 0.3 to 2 mm in view of workability.

The painting sheet can be subjected to usual roll-up printing after the above-mentioned thermoplastic resin sheet is provided with a corona discharge treatment and / or a primer layer, if necessary.
Select the printing method according to the design and printing lot such as gravure printing, offset printing, flexo printing, silk screen printing. Gravure printing, in which the binder of the printing ink can be freely selected, is preferable, and the binder of the ink is preferably made of a thermoplastic resin in view of the conformability to the uneven surface of the paperboard, and further considering the compatibility with the adhesive. To select. Examples include acrylic resins, vinyl chloride / vinyl acetate copolymers, polyvinyl butyral, and nitrocellulose. As the colorant for the ink, an ordinary inorganic or organic pigment having excellent durability or an extender pigment can be used. Examples include carbon black, titanium oxide, iron oxide, phthalocyanine blue, quinacridone red, polyazo yellow, calcium carbonate and silica.

When a metallic feeling is required in terms of design, aluminum is used for the design layer or the base sheet,
A vapor-deposited layer of chromium, silver or the like can be provided entirely or partially. Partial vapor deposition is carried out by a conventional partial vapor deposition method such as etching performed by protecting the vapor deposition layer with a patterned resist or removing the vapor deposition layer of the primer layer by washing with water by providing the vapor deposition layer on the water-soluble patterned primer layer. Can be formed.

The release layer of the transfer sheet may be omitted if the release property is stable regardless of the color tone between the sheet and the applied ink. Usually, it is desirable to provide a peeling layer including a protective function for maintaining the durability of the pattern layer. The material is selected such that it has a releasability from the base sheet or the release layer used. Usually used are acrylic, urethane,
If necessary, a varnish of a thermoplastic resin mainly composed of polyester or vinyl chloride / vinyl acetate copolymer is added with a lubricant such as wax or silicone resin, or an additive such as an antistatic agent. The application may be a usual method such as gravure coating or roll coating,
The coating amount is also preferably 1 to 5 g / m ² .

The release layer of the transfer sheet is used, for example, when a sheet having good moldability such as polyvinyl chloride or polycarbonate is used, or when there is no ink material having an appropriate peeling function. It is also possible to add fine particles to the release layer to form a matte layer on the whole surface or in a pattern so that the surface of the transferred image has a gloss change. The material is
Ordinary thermoplastic resin varnish such as polyamide, acrylic resin, polyester resin, nitrocellulose,
There are silicone, which is a releasable material, and phosphoric acid ester added to a solution of cellulose acetate butyrate, and a curable resin such as melamine, aminoalkyd, and curable silicone. It may be formed by a usual method such as gravure printing, silk screen printing, gravure coating, roll coating, etc., and its application amount is 0.2 to 1.5 g which is a small amount that does not hinder the releasability. / M ² is preferred.

The pattern layer of the transfer sheet can be provided by using the same material and method as those of the painting sheet. And, if necessary, a primer layer of an adhesive or a heat-sensitive adhesive layer can be formed on the pattern layer. When the above-mentioned heat-sensitive adhesive is formed, or when the ink forming the pattern layer has a heat-adhesive property with respect to the paperboard, the adhesive layer of the adhesive layer is applied when painting on the paperboard as in the invention of claim 2. The coating process can be omitted. Adhesives to be applied to painting sheets, transfer sheets, or corrugated paperboard are heat-adhesive adhesives such as polyvinyl acetate, acrylic resins, ionomers, polyurethane, polyester, polyvinyl acetate, vinyl acetate / acrylic ester A polymer or an aqueous dispersion (emulsion) such as a rubber is used as an adhesive. The coating amount depends on the required adhesive strength, paper board absorbency,
The amount is usually 5 to 50 g / m ² , though it depends on the shape of the unevenness.

A known press or embossing machine such as a lithographic press machine or a roll embossing machine can be used as a method for imprinting the uneven pattern of the embossing plate on the paperboard by heat and pressure. In the case of a jigsaw puzzle, a concavo-convex pattern corresponding to the pattern of the puzzle, for example, in a landscape image, the near view is made convex and the distant view is made concave. In addition, a topographical map or, in the case of a three-dimensional model, an uneven pattern corresponding to the elevation of the land, sea, river, and mountain elevation is formed.
The level difference of the unevenness is determined according to the design and application, but if the level difference (the difference in height between the concave portion and the convex portion) is large, the follow-up of the painting sheet to the concave portion becomes insufficient. Usually, it is preferable that the maximum width is 5 mm or less. Further, regarding the convex portion, the ratio of the width of the convex portion and the step difference of the rising portion is preferably 0.7 or less when the rising angle is 90 degrees (rise step / recess width).
It is determined by the pitch of the protrusions.

In the painting method, the painting sheet is formed and brought into close contact with the surface of the article to be painted by a pressure difference due to vacuum suction. Either known so-called vacuum press molding or a method called vacuum lamination may be used. For example, JP-B-56-45768 or JP-A-5-31
The technique described in Japanese Patent No. 743 is used. That is, the pedestal 71 on which the paperboard 3 having the penetrating portion 9 provided on the upper portion of the lower chamber 7 shown in FIG. This is performed by a vacuum forming apparatus including a source 76 and an upper chamber 6 provided with a heater 62 for heating.

Using the above vacuum forming apparatus, if necessary, the corrugated board 3 having the corrugated surface coated with an adhesive layer is placed on the pedestal 71 with the corrugated shape facing upward, and the pattern layer 2 is brought into contact with it. Thus, the painting sheet 12 is provided, and the upper chamber 6 and the lower chamber 7 sandwich the painting sheet to hermetically seal both chambers. Then, in a state where both the upper and lower chambers are decompressed, the heating heater 62 preheats the painting sheet, and then only the upper chamber is heated to form a painting sheet by the pressure difference between the two chambers. Press contact with the paperboard. At this time, the press-molded air sent from the upper chamber 6 can further complete the molding and press-bonding of the sheet. Then, the paperboard on which painting has been finished is cut into a desired size as necessary. When the transfer sheet 26 shown in FIG. 3 is used for painting, the base sheet 1 may be used as a protective sheet until the painted paperboard is processed as a final product. Alternatively, it may be removed by peeling immediately after the end of the bonding step. If the base sheet is an elastomer, or if the thermoplastic resin has sufficient moldability at room temperature, the step of preheating the base sheet can be omitted.

Further, the pressure bonding with the above-mentioned pressurized air can be carried out by the technique described in the vacuum press lamination molding method and apparatus of JP-A-5-31743. That is, the lower chamber 7 having the reduced pressure source 77 shown in FIG.
An intermediate chamber 67 having a pressurizing / depressurizing source 76 in the space between the pedestal 71 for mounting the paperboard provided in the lower chamber 7 and the rubber-like elastic film 8, the pressurizing / depressurizing source and the heater 6 for heating.
2 is performed by a vacuum forming apparatus configured with an upper chamber 6 having two. That is, the pedestal 71 provided in the lower chamber 7 is placed so that the uneven surface of the paperboard 3 having the uneven shape and the pattern layer of the painting sheet 12 are in contact with each other.
It is divided into an intermediate chamber 67 capable of reducing the pressure between the painting sheet and the rubber-like elastic film and a lower chamber 7 containing the paperboard 3. Then, the pressurizing / depressurizing source 76 depressurizes the intermediate chamber 67 and the upper chamber 6 and sucks the painting sheet 12 to the rubber-like elastic film 8. After removing the air between the painting sheet and the paperboard, the upper chamber 6
The lower chamber 7 is decompressed by the decompression source 77 while returning the intermediate chamber 67 and the intermediate chamber 67 to normal pressure to remove the air in the lower chamber 7, and the rubber-like elastic film 7 is used for the painting sheet 1.
2 is formed, adhered and laminated on the uneven surface of the paperboard 3. Further, from the side of the painting sheet, the rubber-like elastic film is pressed by the pressurization of the air pressure of the pressure increasing / decreasing source 76, and the adhesion between the painting sheet and the corrugated paperboard can be strengthened.

For the alignment between the uneven shape provided on the paperboard and the pattern layer, a positioning mark was provided at the end of the paperboard and the mark was made to coincide with the mark provided on the painting sheet or transfer sheet. After that, it is possible to fix the painting sheet and perform molding, lamination, or transfer process. As the alignment mark, for example, a cross-shaped mark used for registration in normal printing is used. In addition, even if the alignment is done manually by visual inspection,
Alternatively, a sensor such as a photoelectric tube and a servomotor may be used to automatically control the sheet or board feeding mechanism.

[0022]

As described above, the unevenness-shaped paperboard and the preheated laminated sheet for painting or the transfer sheet are pressed and deformed until they follow the unevenness of the paperboard by pressure difference due to the pressure difference due to the vacuum suction. It works to form and adhere to the uneven surface of the paperboard. Then, an image obtained by accurate printing on a printable sheet,
It becomes possible to faithfully form a corrugated paperboard. Also, in the painting process, the crimping of the paperboard and the painting sheet is
Since it is performed by being pneumatically pressed through the base material sheet,
The ink of the pattern layer does not adhere to other parts by sticking in the processing step, and the pattern does not drop off due to friction. Furthermore,
By pressing with a rubber-like elastic film or pressing with pressurized air from the side of the painting sheet,
It is possible to more reliably adhere the painting sheet to the uneven shape.

[0023]

Embodiments will be described in more detail with reference to the drawings. [Embodiment 1] In FIG. 1, a sheet-like paperboard having a thickness of 2 mm in which pulp containing waste paper is provided in a core material has unevenness of 1 to 1
An uneven surface corresponding to a landscape image in a range of 1.5 mm was pressed by a mold to give an uneven shape paperboard 3. on the other hand,
The pattern layer 2 corresponding to the uneven surface is formed by gravure rotary printing on the corona-treated surface of the unstretched polypropylene sheet 1 having a thickness of 30 μm with a gravure ink mainly containing a polyester polyol as a main agent and an isocyanate polyurethane binder as a curing agent. Then, the painting sheet 12 shown in FIG. 1 (b)
It was created. An adhesive layer 4 made of a urethane resin emulsion by roll coating on the paperboard 3 having the uneven surface.
15 g / m ² (solid content conversion) was applied, and the unevenness of the uneven board 3 coated with the adhesive layer 4 was placed on the pedestal 71 in the vacuum forming apparatus shown in FIG. The painting sheet 12 is provided so that and the two are in contact with each other, and the upper chamber 6 and the lower chamber 7 sandwich the painting sheet to seal the both chambers. Then, both chambers are decompressed to a vacuum by decompression sources 76 and 77 composed of rotary vacuum pumps, and the heating sheet 62 is used to decorate the sheet 1 for painting.
2 is preheated to 100 ° C. and then connected to the pressure source 76 of the upper chamber 6 to pressurize to atmospheric pressure, and the paperboard is vacuumed through the through hole 9 to draw the paper due to the pressure difference between the two chambers. The sheet and the paperboard were molded and pressure-bonded under the conditions of 140 ° C. and 120 seconds to be laminated. The decorating sheet 12 adhered to the uneven surface of the paperboard without any space, and the uneven shaped decorative paperboard 5 in which the positional relationship between the pattern layer and the uneven surface was matched was obtained.

[Embodiment 2] In FIG. 2, a sheet-shaped corrugated paperboard 3 having a thickness of 2 mm and having the pulp prepared in Embodiment 1 provided on a core material was placed on a pedestal 71. A base sheet 1 made of unstretched polypropylene having a thickness of 50 μm having a structure shown in FIG. 3, a release layer 21 made of a nitrified cotton resin binder, a pattern layer 2 and an adhesive layer 24 mainly made of vinyl acetate resin are sequentially arranged. The transfer layer 20 of the laminated transfer sheet 26 and the uneven surface of the paperboard are fixed so as to be in contact with each other, and the upper chamber and the intermediate chamber below the rubber-like elastic film 8 made of silicone rubber are provided by the pressurizing / depressurizing source 76. The pressures of 67 and 67 were reduced, and the transfer sheet 26 was sucked into the elastic film 8. At that time, the transfer sheet was heated by heat conduction from the elastic film 8 heated by the radiant heat of the heating heater 62. Next, the lower chamber 7 is decompressed by the decompression source 77 to remove the air in the lower chamber 7 and the upper chamber 6 is returned to the atmospheric pressure, and the transfer sheet 26 is pressure-bonded to the uneven surface of the paperboard 3 by the elastic film 8. Then, the upper chamber 6 was pressurized by the pressurizing / depressurizing source 76 under the conditions of 4 Kg / cm ² , 140 ° C. and 100 seconds, and molded and bonded as shown in FIG. Further, the upper chamber and the lower chamber were returned to atmospheric pressure, and the base material sheet 1 was peeled and removed as shown in FIG. The transfer layer 20 could be adhered to the uneven surface of the paperboard without any gaps, and it was possible to obtain the uneven paperboard 5 having the uneven shape in which the positional relationship between the pattern layer and the uneven surface was matched. In addition, the ink of the pattern layer did not adhere to the silicone rubber, the ink did not fall off, and the problem of peeling between papers did not occur.

[0025]

EFFECTS OF THE INVENTION The printability is poor and it is difficult to provide a photographic-like pattern layer. On the uneven surface of the corrugated paperboard, a precise pattern layer provided on the base sheet having excellent printability is provided.
Since it is provided by a pressure difference due to vacuum and suction, a precise pattern layer could be provided without chipping of the pattern in the concave portion and ink of the pattern layer sticking to the silicone rubber. Further, by applying pressure by the pressurized air or pressure by the elastic rubber film from the side of the painting sheet, the painting sheet could be more surely brought into close contact with the uneven shape having large steps. This makes it possible to create elaborate prints on jigsaw puzzles, landscapes, topographic maps, and the like.

[Brief description of drawings]

FIG. 1 (a) is a schematic cross-sectional view showing a method for painting a corrugated paperboard of the present invention. (b) A schematic cross-sectional view showing the structure of a decorative paperboard laminated with a decorative sheet.

FIG. 2 is a schematic cross-sectional view showing another method of painting on a corrugated paperboard.

FIG. 3 is a schematic cross-sectional view showing a laminated state of a transfer sheet and a corrugated paperboard.

FIG. 4 is a schematic cross-sectional view showing a method for painting a concavo-convex paperboard of the present invention showing a state where a transfer sheet is pressed by a rubber-like elastic film.

FIG. 5 is a schematic cross-sectional view showing a state after peeling of the transfer sheet.

[Explanation of symbols]

 1 Base Material Sheet 12 Sheet for Painting 2 Pattern Layer 20 Transfer Layer 26 Transfer Sheet for Painting (Transfer Sheet) 3 Paperboard with Concavo-convex Shape 4 Adhesive Layer 5 Painting Paperboard 6 Upper Chamber 62 Heating Heater 67 Lower Chamber 7 Lower chamber 71 Pedestal 76 Pressurizing / depressurizing source 77 Depressurizing source 8 Rubber-like elastic film 9 Through hole

Claims (2)

[Claims] 1. An uneven surface of a paperboard having an uneven surface,
The patterning sheet provided with the patterning layer is overlapped so that the patterning layer and the uneven surface are in contact with each other, vacuum suction is applied from the side of the paperboard, and the pressure-sensitive sheet is used to form and pressure-bond the patterning sheet on the paperboard. , A method for painting on a corrugated paperboard, characterized in that it is integrally bonded to the corrugated surface of the paperboard. 2. An uneven surface of a paperboard having an uneven surface,
A sheet for painting having a transfer layer having at least a pattern layer on a base material sheet is stacked so that the transfer layer and the uneven surface are in contact with each other, and vacuum suction is applied from the side of the paperboard, and the paperboard is produced by a pressure difference. A method for painting on a corrugated paperboard, characterized in that a painting sheet is molded and pressure-bonded to, a transfer layer is adhered to the corrugated surface of the paperboard, and then only the base sheet is peeled off.