JP5985192B2 - Production method and decoration method of transfer film - Google Patents

Description

  The present invention relates to a method for producing a transfer film and a decorating method.

  There is known an IMD (In-Mold Decoration) technique for pasting a printed film and decorating a material. For example, Patent Document 1 describes a decoration method using IMD.

JP 2008-272946 A

  In the method described in Patent Document 1, a binder layer for adhering a film to a resin molded body is formed by inkjet.

  However, in order to form a binder layer by inkjet, it is necessary to dissolve the resin forming the binder layer in a solvent. This solvent may dissolve components such as pigments contained in the colored layer and adversely affect the colored layer.

  This invention is made | formed in view of such a problem, and it aims at providing the manufacturing method of the film for transfer which can be used for decorating methods, such as IMD, making the influence on a colored layer lower. To do.

In order to solve the above-described problems, a transfer film manufacturing method according to the present invention includes bonding an adhesive layer formed on a release sheet to a surface of a colored layer formed on a base film. Including the bonding step, the surface of the adhesive layer, a surface different from the surface with the release sheet, another release sheet is previously pasted, before the bonding step, the said further stripping sheet peeled from the adhesive layer, of the surface of the adhesive layer comprises an adhesive layer preparation step of exposing the surface to be bonded to the colored layer in the bonding step, the adhesive layer, the in the bonding step, the adhesive force to adhere to the surface of the colored layer, said coating layer comprising an ultraviolet curable resin was formed by an inkjet on the base film, a thermoplastic as the binder resin onto the coating layer The colored layer containing a resin formed by an ink-jet, the coating layer, the other side to the above colored layer bonded together the surface of the surface of the adhesive layer peeled off the release sheet from the adhesive layer to be characterized in that by peeling the and the substrate film can be adhered to the transfer body is transferred to the transfer object with the colored layer, it is intended to cover and protect the colored layer transferred to the transfer object And

  By providing an adhesive layer on the release sheet in advance and pasting it on the colored layer, it is contained in the adhesive layer as compared with the case where the adhesive component constituting the adhesive layer is printed on the colored layer by inkjet or the like. The solvent can be reduced. Therefore, the adhesive layer can be prevented from being attacked by the solvent.

  Therefore, the decorating method such as IMD can be performed with lower influence on the colored layer.

  In addition, when the adhesive layer is formed by inkjet or the like, the adhesive layer is exposed and dust adheres to it, and when the adhesive layer is sticky, it adheres to another instrument or material or the adhesive layers However, it cannot be stored for a long period of time, so it is necessary to immediately perform the next step such as IMD. However, according to the above configuration, the surface of the adhesive layer is protected by the release sheet. Therefore, the transfer film obtained by the above production method can be stored for a long time.

  In addition, there is an advantage that an apparatus for printing is unnecessary compared with the case of printing the adhesive component.

  By sandwiching the adhesive layer between two peeling sheets, the adhesive layer can be stored while maintaining the adhesive force.

  According to this configuration, the colored layer can be protected by the coating layer after the transfer using the transfer film.

  A colored layer using a thermoplastic resin as a binder resin has a problem that when an adhesive layer is formed directly on the upper layer by ink jet or screen printing, it is attacked by a solvent contained in the ink. According to said structure, even if it uses a thermoplastic resin as binder resin, since the quantity of the solvent contained in an contact bonding layer can be decreased as much as possible in this invention, a colored layer is not attacked. For example, in a colored layer using an ultraviolet curable ink as a binder resin, since the resin is thermosetting, even if the adhesive layer is formed on the upper layer by inkjet or screen printing, the colored layer is formed by the solvent contained in the adhesive layer. Is rarely affected. It can be said that the present invention is more suitable for a colored layer using a thermoplastic resin as a binder resin.

  The decorating method according to the present invention includes an adhesion step in which the peeling sheet of the transfer film obtained by the transfer film manufacturing method according to the present invention is peeled off and the adhesive layer is adhered to the transfer target. It is characterized by.

  Since the transfer film according to the present invention is used, the colored layer can be transferred to the transfer target in a state where the adverse effect of the colored layer due to the solvent is suppressed. Therefore, decoration with excellent quality can be performed.

  In the decorating method according to the present invention, a positioning part for attaching to an IMD (In-Mold Decoration) molding machine is provided in advance on the transfer film, and in the bonding step, the transfer film is placed on the IMD (In- More preferably, it is adhered to a transfer object mounted on a molding machine.

  The transfer film can be accurately mounted by an IMD molding machine.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that the influence on a colored layer can be made lower and the film for transfer which can be used for decorating methods, such as IMD, can be provided.

It is a figure which shows typically the procedure of one Embodiment of the manufacturing method and decorating method of the film for transfer concerning this invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a diagram schematically showing a procedure of an embodiment of a method for producing a transfer film and a decorating method according to the present invention.

[Method for Producing Transfer Film 100]
The structure of the transfer film 100 obtained in this embodiment is shown in FIG. As shown in FIG. 1C, the transfer film 100 includes a base film 11, a release layer 12, a hard coat layer 13, a colored layer 14, and an adhesive layer 21.

  First, as shown to (a) of FIG. 1, the laminated body which consists of the base film 11, the peeling layer 12, and the hard-coat layer 13 is prepared.

  In this laminate, a release layer 12 is formed on a base film 11, and a hard coat layer 13 is formed on the release layer 12.

  Although the base film 11 consists of olefin resin, the base film used with the manufacturing method of the transfer film which concerns on this invention is not limited to this, What is necessary is just to be separable from a colored layer later. For example, as a material constituting the base film, polypropylene resin (PP resin), polyethylene resin (PE resin), ethylene vinyl acetate copolymer resin (EVA resin), polyolefin soft resin (TPO resin), polyethylene terephthalate resin ( PET resin) and polycarbonate resin (PC resin). Among these olefin resins, polypropylene resin (PP resin) and polyethylene resin (PE resin) have the most preferable peelability as the base film. In addition, 50-250 micrometers is preferable and, as for the thickness of a base film, 100-180 micrometers is more preferable. Moreover, when not providing the peeling layer 12 like this embodiment, it is good to use the base film which has mold release property.

  The release layer 12 is a layer sandwiched between the base film 11 and the colored layer 14 in order to separate the base film 11 and the colored layer 14 later.

  The release layer 12 is formed of a transparent ultraviolet curable (UV curable) resin material. However, in the method for producing a transfer film according to the present invention, when a release layer is provided between the base film and the colored layer, the material is not limited thereto, and the base film and the colored layer are separated after transfer. Any material can be used. For example, epoxy acrylate or epoxy methacrylate, polyester acrylate, such as polypropylene, polyethylene, urethane methacrylate, bisphenol A, bisphenol F, bisphenol AD, water-added bisphenol A, dimer acid modified, etc. Polyester methacrylate, silicone acrylate, silicone methacrylate, alkyd acrylate, alkyd methacrylate, and the like can also be used.

  In this embodiment, a hard coat layer (coating layer) 13 is provided separately from the release layer 12, but when the release layer 12 also serves as a hard coat layer, the main component is preferably a polymer acrylate or a urethane acrylate. .

  The release layer 12 is preferably formed by inkjet printing, but may be formed by coater, gravure printing, or screen printing. The thickness of the release layer 12 is preferably about 10 μm to 50 μm, for example.

  The hard coat layer 13 is a coating layer for coating the colored layer 14 after being transferred to the transfer target 30 together with the colored layer 14 and transferred.

  The specific material for the hard coat layer 13 may be selected as appropriate by the user in accordance with the use of the decorated molded body. For example, it may be formed of an ultraviolet curable resin or the like, and cured by irradiation with ultraviolet rays after transfer. The hardness of the hard coat layer 13 when cured is, for example, H or more, preferably 2H or more in pencil hardness.

  Next, a colored layer 14 is formed on the hard coat layer 13 as shown in FIG. The colored layer 14 is a layer formed of ink for decorating the transfer target 30. The specific color, properties, etc. of the ink may be appropriately selected according to the purpose of decoration, etc., but the ink for forming the colored layer 14 is more preferably a highly viscous material. This is because even if the molded body has a concavo-convex structure, it can be decorated more uniformly if it extends along the surface of the concavo-convex structure.

  Moreover, it is more preferable that the colored layer 14 contains a thermoplastic resin as a binder resin.

  A colored layer using a thermoplastic resin as a binder resin has a problem that when an adhesive layer is formed directly on the upper layer by ink jet or screen printing, it is attacked by a solvent contained in the ink. According to said structure, even if it uses a thermoplastic resin as binder resin, since the quantity of the solvent contained in an contact bonding layer can be decreased as much as possible in this invention, a colored layer is not attacked. For example, in a colored layer using an ultraviolet curable ink as a binder resin, since the resin is thermosetting, even if the adhesive layer is formed on the upper layer by inkjet or screen printing, the colored layer is formed by the solvent contained in the adhesive layer. Is rarely affected. It can be said that the present invention is more suitable for a colored layer using a thermoplastic resin as a binder resin.

  Moreover, as shown in FIG. 1B, an adhesive film 20 is prepared. The adhesive film is formed by sandwiching an adhesive layer 21 between peeling sheets 22 and 23. In this way, by sandwiching the adhesive layer 21 between the two peeling sheets 22 and 23, the adhesive layer 21 can be stored while maintaining the adhesive force. That is, when the adhesive layer 21 is exposed and dust adheres, or when the adhesive layer 21 is sticky, it adheres to another device or material, or adheres between the adhesive layers 21 or the like. It is possible to prevent the adhesive layer 21 from being deteriorated or unusable.

  The adhesive layer 21 may be composed of an arbitrary adhesive, and the adhesive layer used in the method for producing a transfer film according to the present invention only needs to be able to adhere the colored layer to the transfer target. For example, a resin such as an acrylic resin, a vinyl chloride resin, a vinyl acetate resin, a polyester resin, or a polyamide resin can be used. The thickness of the adhesive layer may be set as appropriate depending on the type of resin of the transfer object to be attached, and is preferably about 5 to 30 μm, for example.

  Next, the adhesive layer 21 formed on the peeling sheet 22 is bonded to the surface of the colored layer 14 formed on the base film 11 as shown in FIG. ).

  First, one of the two peeling sheets constituting the adhesive film 20 is peeled off to expose the surface of the adhesive layer 21 (adhesive layer preparation step). Here, in this embodiment, the peeling sheet 22 is bonded to the adhesive layer 21 with a stronger adhesive force than the peeling sheet 23. That is, it is more preferable that the peeling sheet peeled off from the adhesive layer 21 in the adhesive layer preparation step is a peeling sheet having a weaker adhesive force to the adhesive layer 21. As described above, in the present invention, the two peeling sheets that are previously stuck to the adhesive layer are stuck with different adhesive strengths, and in the adhesive layer preparation step, the peeling sheet having the weaker adhesive strength is peeled off. More preferably. It is because peeling of the peeling sheet is easy. Next, the exposed surface of the adhesive layer 21 is bonded to the colored layer 14. The specific method of bonding is not particularly limited, and it is sufficient that the adhesive layer 21 is formed on the colored layer 14. For example, from the surface opposite to the side where the adhesive layer 21 of the release sheet 22 is provided. Lamination may be performed by pressing with a hand or a pressing member or thermocompression bonding. Thereby, the transfer film 100 is manufactured. Thus, compared with the case where the adhesive layer 21 is provided on the release sheet 22 in advance and the adhesive layer 21 is attached to the colored layer 14, the adhesive component constituting the adhesive layer is printed on the colored layer by inkjet or the like. Thus, the solvent contained in the adhesive layer can be reduced. This is because the solid ratio can be increased because there is no need to discharge by ink jet. Therefore, the decorating method such as IMD can be performed with lower influence on the colored layer. In addition, when the adhesive layer is formed by inkjet or the like, the adhesive layer is exposed and cannot be stored for a long period of time, and it is necessary to immediately perform the next step such as IMD. Since the surface of the layer 21 is protected by the release sheet 22, the transfer film 100 can be stored for a long period of time. In addition, there is an advantage that an apparatus for printing is unnecessary compared with the case of printing the adhesive component. Moreover, since the quantity of the organic solvent scattered during the process of manufacturing the film 100 for transfer, and the process of decorating can be reduced, it is excellent also from a viewpoint of safety.

[Decoration method]
Next, an embodiment of the decorating method according to the present invention will be described.

  As shown in FIG. 1D, the peeling sheet 22 of the transfer film 100 is peeled off, and the adhesive layer 21 is bonded to the transfer target 30 (adhesion step). Then, the base film 11 is peeled off and the decoration ends.

  The bonding process is performed by, for example, an IML (In-Mold Lamination) technique. In the IML, the transfer film 100 is placed in a predetermined mold, and the transfer film 100 is attached to the surface of the transfer target 30 with the mold closed. In addition, in addition to IML, roll type or up-down type thermal transfer, vacuum press transfer, or the like may be used for attaching the transfer film 100. A conventionally known IMD molding machine may be used.

  When using an IML molding machine or an IMD molding machine, a positioning part (not shown) for attaching to the IML molding machine or the IMD molding machine is provided in advance on the transfer film 100, and in the bonding step, the transfer film 100 is placed in the IMD. It is more preferable to adhere to a transfer object mounted on a molding machine. This is because the transfer film can be accurately mounted by the IMD molding machine. At this time, the IML molding machine or the IMD molding machine may be provided with a structure corresponding to the positioning portion. For example, when a punch hole is made in the transfer film 100 as a positioning portion, the IML molding machine or the IMD molding machine may be provided with a protrusion structure that fits into the punch hole. And it is good to make it fit visually by the protrusion structure which formed the punch hole which the operator drilled in the film 100 for transfer in the IMD molding machine. Further, for example, an IMD molding machine or the like may be provided with a sensor that recognizes the positioning unit, and the positioning unit may be recognized and aligned by the sensor.

  Finally, the base film 11 may be peeled off. Further, the step of curing the hard coat layer 13 by irradiating it with ultraviolet rays or the like may be performed before or after the substrate film 11 is peeled off.

  Moreover, in this embodiment, since the base film 11 has extensibility, when transferring with an IMD molding machine etc., it can extend according to the shape of a to-be-transferred body. Moreover, the base film 11 can be reused even after peeling. When the substrate film 11 is reused, it is preferable to remove attached dust, components of the release layer 12, and the like with a cleaner or the like.

<Additional notes>
As described above, in one embodiment of the method for producing a transfer film according to the present invention, the adhesive layer formed on the release sheet 22 on the surface of the colored layer 14 formed on the base film 11. look including a bonding step bonding the 21, a surface of the adhesive layer 21, to another aspect to the surface there is the release sheet 22, another release sheet 23 is affixed in advance, Before the bonding step, the method includes an adhesive layer preparation step of peeling the other release sheet 23 from the adhesive layer 21, and the colored layer 14 is formed by inkjet. The adhesive layer 21 is formed in the bonding step. The adhesive layer adheres to the surface of the colored layer 14 by adhesive force .

  The adhesive layer 21 is provided on the release sheet 22 in advance, and the adhesive layer 21 is attached to the colored layer 14, so that the adhesive component constituting the adhesive layer is printed on the colored layer by inkjet. The solvent contained can be reduced. Therefore, the decorating method such as IMD can be performed with lower influence on the colored layer 14. In addition, when the adhesive layer is formed by inkjet or the like, the adhesive layer is exposed and dust adheres to it, and when the adhesive layer is sticky, it adheres to another instrument or material or the adhesive layers The surface of the adhesive layer 21 is the peeling sheet 22 according to the present embodiment, although it cannot be stored for a long period of time and needs to be immediately subjected to the next step such as IMD. Since it is protected, the transfer film 100 can be stored for a long time. In addition, there is an advantage that an apparatus for printing is unnecessary compared with the case of printing the adhesive component.

  By sandwiching the adhesive layer 21 between the two peeling sheets 22 and 23, the adhesive layer 21 can be stored while maintaining the adhesive force.

  In one embodiment of the method for producing a transfer film according to the present invention, it is more preferable to form the hard coat layer 13 between the base film 11 and the colored layer 14. According to this configuration, the colored layer 14 can be protected by the hard coat layer 13 after the transfer using the transfer film.

  Moreover, in one Embodiment of the manufacturing method of the transfer film which concerns on this invention, the colored layer 14 contains the thermoplastic resin as binder resin.

  A colored layer using a thermoplastic resin as a binder resin has a problem that when an adhesive layer is formed directly on the upper layer by ink jet or screen printing, it is attacked by a solvent contained in the ink. According to the above configuration, even if a thermoplastic resin is used as the binder resin, the amount of the solvent contained in the adhesive layer 14 can be reduced as much as possible in this embodiment, so that the colored layer 14 is not affected. . For example, in a colored layer using an ultraviolet curable ink as a binder resin, since the resin is thermosetting, even if the adhesive layer is formed on the upper layer by inkjet or screen printing, the colored layer is formed by the solvent contained in the adhesive layer. Is rarely affected. It can be said that the present invention is more suitable for a colored layer using a thermoplastic resin as a binder resin.

  One embodiment of the decorating method according to the present invention includes an adhesion step in which the peeling sheet 23 of the transfer film 100 is peeled off and the adhesive layer 21 is adhered to the transfer target 30.

  The colored layer 14 can be transferred to the transfer target 30 in a state where the adverse effect of the colored layer 14 due to the solvent is suppressed. Therefore, decoration with excellent quality can be performed.

  In one embodiment of the decorating method according to the present invention, the transfer film 100 is previously provided with a positioning portion for attaching to an IMD (In-Mold Detection) molding machine, and in the bonding step, the transfer film 100 is IMD ( In-Mold Decoration) Adhered to an object to be transferred mounted on a molding machine. The transfer film 100 can be accurately mounted by an IMD molding machine.

  The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims, and the technique of the present invention also relates to an embodiment obtained by appropriately combining the disclosed technical means. Included in the scope.

  The present invention can be used for, for example, a decoration method by IMD.

11 Substrate film 12 Release layer 13 Hard coat layer (coating layer)
14 Colored layer 20 Adhesive film 21 Adhesive layer 22, 23 Peeling sheet 30 Transfer object 100 Transfer film

Claims (3)

Including a bonding step of bonding the adhesive layer formed on the release sheet to the surface of the colored layer formed on the coating layer formed on the base film,
On the surface of the adhesive layer, which is different from the surface where the release sheet is located, another release sheet is previously pasted,
Before the bonding step, the said further stripping sheet peeled from the adhesive layer, of the surface of the adhesive layer, the adhesive layer preparation step of exposing the surface to be bonded to the colored layer in the bonding step Including
In the bonding step, the adhesive layer adheres to the surface of the colored layer by adhesive force ,
Forming the coating layer containing an ultraviolet curable resin on the base film by inkjet,
Forming the colored layer containing a thermoplastic resin as a binder resin on the coating layer by inkjet,
The covering layer is formed by peeling the release sheet from the adhesive layer and bonding the surface of the adhesive layer different from the surface on which the colored layer is bonded to the transfer target and the base film. by peeling, is transferred to the transfer object with the colored layer, the manufacturing method of the transfer film, characterized in that it is intended to cover and protect the colored layer transferred to the transfer object. A decorating method comprising: an adhesion step of peeling off the release sheet of the transfer film obtained by the method for producing a transfer film according to claim 1 to adhere the adhesive layer to a transfer object. . A transfer film is previously provided with a positioning part for mounting on an IMD (In-Mold Detection) molding machine,
The decorating method according to claim 2 , wherein, in the bonding step, the transfer film is bonded to a transfer target mounted on the IMD (In-Mold Detection) molding machine.

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