JP2010280062A - Sheet material, and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet material capable of executing post-working such as printing and recoating on a coating layer, while maintaining an excellent characteristic of the coating layer, and capable of reducing electrostatic charge, and a manufacturing method therefor. <P>SOLUTION: This sheet material has the resin coating layer 3 applied with a resin on a surface of a sheet-like base material 2 such as a resin film, paper and a metal foil, followed to be cured, has an activated layer 4 formed by direct corona discharge treatment, without pretreatment such as precoating, on a surface of the resin coating layer, and has an upper layer resin coating layer 5 coated with the resin again on the activated layer 4, and cured. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a sheet material in which a resin coating layer is formed on the surface of a sheet-like substrate such as a resin film, paper, and aluminum foil, and a method for producing the sheet material.

  A sheet material having a glossy surface has high decorativeness, can be used easily, and is inexpensive, and is widely used, for example, as a film sheet for decorating the surface of an article. As such a decorative sheet material, a sheet material in which a resin coating layer is formed on the surface of a sheet-like base material is widely used. For example, a corona discharge is applied to one side of a base film (base material) made of a polypropylene film. A film sheet is proposed in which a treatment is applied, an anchor coat is applied to the treated surface, a polyethylene resin is laminated, and an ethylene-vinyl acetate copolymer resin is coated on the laminated surface (Patent Document 1).

Japanese Patent Laid-Open No. 10-235810

  Like the above-described film sheet, prior to the final resin coating, the conventional sheet material first applies an anchor coat to the surface of the base material, and then laminates the resin and coats the resin thereon. Therefore, it is required to perform a plurality of types of base treatments before the final coating. If this surface treatment is neglected, the compatibility between the surface and the coating resin is poor, and the resin cannot be applied, or even if applied, the bonding force is insufficient and the adhesive peels off later, or the adhesive is applied. Inadequate adhesive strength cannot be exhibited, so that it could not be omitted.

  In addition, if a coating layer is formed by applying an ultraviolet curable resin to the surface of the substrate and irradiating with ultraviolet rays (UV coating), it becomes a durable surface with excellent durability, so it can be used for various applications. There is. However, on the other hand, when post-processing such as printing on the coating layer or re-coating of the resin is performed, there is also a drawback that the post-processing becomes difficult due to the strong smooth surface. In order to solve this problem, it has been indispensable to modify the surface state of the coating layer by adding a large amount of an auxiliary agent to the ultraviolet curable resin. However, the addition of the auxiliary agent has the disadvantage that the excellent properties of the original coating layer are impaired. Further, the above-described UV coating has a drawback that the coating layer is easily charged with static electricity.

  The present invention has been proposed in view of the above-described circumstances, and its purpose is to perform post-processing such as printing and re-coating on the coating layer while maintaining the excellent properties of the coating layer. It is an object of the present invention to provide a sheet material and a method for manufacturing the same.

  The present invention has been proposed in order to achieve the above-described object, and the one according to claim 1 cures the applied resin on the surface of a sheet-like substrate such as a resin film, paper, or metal foil. The sheet material is characterized by having an activated resin layer formed by direct corona discharge treatment on the surface of the resin coating layer without performing pretreatment such as precoating.

  According to a second aspect of the present invention, the resin is a photo-curing resin, and a hologram having a fine concavo-convex structure is formed on the surface of a resin coating layer obtained by curing the resin. It is a sheet | seat material of description.

  According to a third aspect of the present invention, there is provided the sheet material according to the second aspect, wherein a printed decoration layer formed by printing is provided on the surface of the activation layer.

  According to a fourth aspect of the present invention, there is provided the sheet material according to the third aspect, wherein an upper resin coating layer obtained by applying and curing a resin again on the surface of the activation layer is provided.

  According to a fifth aspect of the present invention, there is provided the sheet material according to the third aspect, wherein an adhesive layer formed by applying an adhesive is formed on the surface of the activation layer.

What is described in claim 6 is a resin application step of applying a photocurable resin to the surface of a sheet-like substrate such as a resin film, paper, or metal foil,
A light irradiation step of irradiating and curing the applied photocurable resin; and
A corona discharge treatment step for forming an activation layer on the surface of the resin coating layer cured by the light irradiation step by directly performing a corona discharge treatment without pretreatment such as pre-coating;
The sheet material is manufactured through the following steps.

According to a seventh aspect of the present invention, in the light irradiation step described above, a light-transmitting film having a hologram with a fine concavo-convex structure formed thereon is superimposed on the coated surface, and light is irradiated in this polymerization state to be photocurable. The resin is cured and the fine uneven structure is transferred,
It is a manufacturing method of the sheet | seat material of Claim 6 including the peeling process which peels a translucent film from the surface of a resin coating layer after this light irradiation process and before a corona discharge treatment process.

  According to the present invention, the surface of the sheet-like substrate has a resin coating layer, and the surface of the resin coating layer has an activation layer formed by direct corona discharge treatment without pretreatment such as pre-coating. Therefore, post-processing such as printing or recoating can be easily performed on the resin coating layer without impairing the properties of the resin coating layer, and electrostatic charge can be reduced. Moreover, the adhesion | attachment by an adhesive agent is also attained.

  In addition, if the resin is a photo-curing resin and a hologram having a fine concavo-convex structure is formed on the surface of the resin coating layer obtained by curing the resin, a highly decorative sheet material can be easily manufactured, thereby reducing the cost. Can be provided.

  When a print decoration layer is formed on the surface of the activation layer by printing, the degree of freedom of decoration is increased by printing, thereby further improving the decoration.

  Further, when an upper resin coating layer obtained by applying and curing the resin again on the surface of the activation layer is formed, the glossiness can be improved, and thereby the decorativeness can be further enhanced.

  When an adhesive is applied to the surface of the above-described activation layer to form an adhesive layer, adhesion with the adhesive becomes possible, thereby expanding the application as a package material or the like.

It is sectional drawing of the sheet | seat material in which the upper layer resin coating layer was formed. It is sectional drawing of the sheet | seat material in which the printing decoration layer was formed. It is sectional drawing of the sheet | seat material in which the adhesive bond layer was formed.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
A sheet material 1 shown in FIG. 1 has a resin coating layer 3 obtained by curing an applied resin on the surface of a sheet-like substrate 2, and a hologram having a fine concavo-convex structure is formed on the surface of the resin coating layer 3. Further, the surface of the resin coating layer 3 has an activation layer 4 formed by direct corona discharge treatment without performing pre-treatment such as pre-coating represented by anchor coat. An upper resin coating layer 5 is formed by coating the surface of the chemical layer 4 with a resin again.

  For the sheet-like substrate 2, for example, a resin film such as PET (polyethylene terephthalate), PP (polypropylene), PS (polystyrene), PC (polycarbonate), or a metal foil such as paper or aluminum foil may be used. it can. Moreover, the sheet-like base material 2 made of these materials may be long in a band shape, or may be cut short like a sheet.

To form a coating layer made of an ultraviolet curable resin, which is a typical photo-curing resin, on the surface of the resin-coated layer 3, for example, a PP (polypropylene) sheet-like substrate 2 on the sheet-like substrate 2. First, after applying the corona discharge treatment to the surface of the sheet-like substrate 2, an ultraviolet curable resin is applied (resin application step).
Examples of the ultraviolet curable resin include acrylic, polyester, and epoxy resins, which can be appropriately selected and used. And when applying this ultraviolet curable resin to the sheet-like base material 2, it may be applied to the whole surface of the base material 2 by a coater. However, it is applied only to a predetermined part using a plate. May be.

In order to cure the applied ultraviolet curable resin, the application surface is irradiated with ultraviolet rays (light irradiation step). At this time, the ultraviolet curable resin may be cured by irradiating ultraviolet rays through the film in a polymerization state in which a film having translucency is adhered.
The film to be coated on the coated surface may be a normal one having a smooth surface. However, if the surface on the side to be in close contact with the coated surface is formed with irregularities, for example, fine irregularities that become holograms, The hologram can be transferred to the coated surface. The transfer film is peeled and removed after the ultraviolet curable resin is cured by ultraviolet irradiation (before the corona discharge treatment step described later) (peeling step).

  In addition, since the above-mentioned transfer film is endlessly ring-shaped and stretched between rollers and rotated, by peeling off from the cured coating layer and returning to the polymerization position, it is brought into close contact with the next UV curable resin application surface. Can be used repeatedly. The fine irregularities are not limited to the irregularities of the hologram structure, and may be embossed, hairline, or other appropriate diffraction gratings as long as the irregularities are decorative. In this way, when the manufacturing method for transferring the unevenness of the transfer film to the photocurable resin layer is adopted, it is possible to easily form a hologram as a decorative sheet material, which is easy to manufacture, It also contributes to the reduction of manufacturing costs.

  After the light irradiation step and the peeling step described above are completed, the activation layer 4 is then formed on the surface of the cured resin coating layer 3 by direct corona discharge treatment without pretreatment such as precoating. (Corona discharge treatment process). When this corona discharge treatment is performed, the surface of the resin coating layer 3 is modified to a state activated by discharge (radical state), polar groups such as carbonyl groups are generated on the surface, and wettability is improved. As a result, electrostatic charge is reduced. Moreover, the adhesive force of an adhesive agent is increased by being activated.

  Since the surface of the resin coating layer 3 is activated by the corona discharge treatment in the sheet material 1 manufactured through the above-described process, the resin coating layer 3 is coated with a resin again to form the upper resin coating layer 5. Can be formed.

  Further, as shown in FIG. 2, a printed decoration layer 6 on which decorations and characters are written can be formed on the resin coating layer 3, and in this way, an upper layer resin is formed on the resin coating layer 3. When the coating layer 5 and the printed decorative layer 6 are formed, the decorativeness can be further improved.

  Moreover, since the sheet material 1 subjected to the corona discharge treatment is difficult to be charged due to the improvement of the wettability of the surface of the resin coating layer 3, it is difficult to stick due to static electricity even if it is stacked, and handling is easy.

  And since this sheet | seat material 1 has the strong adhesive force at the time of using an adhesive agent, as shown in FIG. 3, applying an adhesive agent and forming the adhesive bond layer 7, and joining with this adhesive bond layer, Can be assembled as a package. Therefore, it can also be used as a package material while taking advantage of the above-described decorativeness and durability.

DESCRIPTION OF SYMBOLS 1 ... Sheet material, 2 ... Sheet-like base material, 3 ... Resin coating layer, 4 ... Activation layer, 5 ... Upper resin coating layer, 6 ... Print decoration layer, 7 ... Adhesive layer

Claims (7)

  A resin coating layer obtained by curing the applied resin is provided on the surface of a sheet-like substrate such as a resin film, paper, or metal foil, and the corona is directly applied to the surface of the resin coating layer without performing pretreatment or the like. A sheet material comprising an activated layer formed by performing a discharge treatment.   The sheet material according to claim 1, wherein the resin is a photo-curing resin, and a hologram having a fine concavo-convex structure is formed on a surface of a resin coating layer obtained by curing the resin.   The sheet material according to claim 2, further comprising a printed decoration layer formed by printing on the surface of the activation layer.   The sheet material according to claim 3, further comprising an upper resin coating layer obtained by applying and curing a resin again on the surface of the activated layer.     The sheet material according to claim 3, further comprising an adhesive layer formed by applying an adhesive on the surface of the activation layer. A resin coating step of coating a photocurable resin on the surface of a sheet-like substrate such as a resin film, paper, or metal foil;
A light irradiation step of irradiating and curing the applied photocurable resin; and
A corona discharge treatment step for forming an activation layer on the surface of the resin coating layer cured by the light irradiation step by directly performing a corona discharge treatment without pretreatment such as pre-coating;
The sheet material is manufactured through the following steps. In the light irradiation step described above, a light-transmitting film having a hologram with a fine concavo-convex structure formed on the surface is superimposed on the coating surface, and light is irradiated in this polymerization state to cure the photocurable resin and the fine concavo-convex structure. Transcribe
The manufacturing method of the sheet | seat material of Claim 6 including the peeling process which peels a translucent film from the surface of a resin coating layer after this light irradiation process and before a corona discharge treatment process.

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