JP6011905B2 - Label manufacturing method - Google Patents

Description

The present invention relates to a process for producing a label to be used by sticking to the surface of the synthetic resin molded article.

Conventionally, as a method of decorating the surface of a molded product made of synthetic resin, for example, a method of sticking an adhesive label as described in Patent Document 1, a hot stamp method using a transfer film as described in Patent Document 2 There are a method of transferring a metal thin film by a method, a method of attaching a label having a metal thin film layer transferred to the surface, and the like.
FIG. 4A is a cross-sectional view showing a typical layer structure of a pressure-sensitive adhesive label that has been conventionally used. This label 101 is formed by laminating a pressure-sensitive adhesive layer 104 on the back side of a base film 102 and further releasing paper 106. , And a printed layer 103 serving as a decorative layer is laminated on the surface side, and a part other than the release paper 106 is punched into a desired shape, and unnecessary portions are wound up and removed. In the case of sticking to an adherend such as a molded product, the release paper 106 is peeled off, and pressure is applied to adhere to the surface of the adherend such as a molded product by the adhesive layer 104.

On the other hand, FIG. 5 is a typical example of a conventional transfer film, and this transfer film 111 is composed of a base film 112, a release layer 113, a protective layer 114, a metal thin film layer 115, and an adhesive layer 116.
Then, this transfer film 111 is polymerized on the surface of the molded product according to the process of the hot stamp method, and pressure is applied by a heated plate to protect the release layer 113 along a predetermined pattern engraved on the plate. A transfer foil 111t composed of a layer 114, a metal thin film layer 115, and an adhesive layer 116 is adhered and transferred to the surface of the molded product via the adhesive layer 116, and the surface of the molded product is transferred along a predetermined pattern. It can be decorated with a layer 115.
Then, the transfer foil 111t portion other than the transfer foil 111t portion transferred to the surface of the molded product is removed together with the base film 112.

FIG. 4B shows an example in which the transfer foil 111t is partially transferred into a predetermined pattern on the surface side of the label 101 shown in FIG. 4A using the transfer film 111 shown in FIG.
By sticking the label 101 decorated with the printed layer 103 and the metal thin film layer 115 to the surface of the molded product, the molded product can be decorated more highly.

JP 2000-112361 A JP 2005-280826 A

Here, in the layer structure shown in FIG. 4B, that is, when the metal thin film layer 115 is partially transferred and laminated in a predetermined pattern by the hot stamp method, the metal thin film layer 115 is often obtained by forming a metal fine particle such as aluminum thin film of about 0.05 micrometer by vacuum evaporation or sputtering, or the like attached more scratches rubbing or the like, damage to facilitate such metal thin film layer is a protective layer 114 This layer is essential for suppressing 115 damage.
However, the protective layer 114 has a thickness of about 1 micrometer applied with an acrylic resin or an epoxy resin, and it is difficult to avoid the formation of fine pinholes or cracks. It is effective to prevent,
For example, when the content stored in a synthetic resin container adheres to the outer surface due to consumer use or dripping, the content is transferred from the pinhole or crack of the protective layer 114 to the metal thin film layer 115. There is a problem that the metal thin film layer 115 is eroded and corroded depending on the type of the contents, and the appearance is greatly impaired.

In addition, regarding the manufacturing process of the label 101 having the layer configuration shown in FIG. 4A, the label manufacturer usually applies the adhesive layer 104 to the entire surface of the base film 102, and further laminates the release paper 106. Purchased raw paper,
The printing layer 103 is printed and laminated on the surface side of the base paper, that is, the surface side of the base film 102, and punching is performed so that the base film 102 and the adhesive layer 104 are punched into a predetermined shape such as a rectangular shape. It is common to remove the unnecessary part of the base film 102 and the adhesive layer 104 while winding up, and to wind up the part used as a label together with the release paper 106 to form a roll,
There is a problem that the cost increases because the manufacturing process of the base paper and the printing and punching process of the printing layer are separate processes.

Furthermore, in the manufacturing process of the label having the layer configuration shown in FIG. 4B, a transfer process by the hot stamp method of the transfer foil 111t including the metal thin film layer 115 is required.
Here, since the transfer process by the hot stamp method requires a stationary time (0.5 to 1 second) in a state where the transfer film 111 is heated and pressurized, the printing process and the transfer process of the printing layer 103 are performed. It is difficult to carry out at a constant speed on a consistent line, and it is necessary to carry out in a separate process, which further increases the cost.

Therefore, the present invention has a technical problem to create a layer structure that can be produced on an integrated line without erosion of the metal thin film due to the contents or the like on the label decorated with the metal thin film layer.

The main configuration of the manufacturing method of the label of the present invention according to the means for solving the above SL technical problems,
The first UV curable adhesive is partially laminated in a predetermined pattern by printing on the back side of the transparent base film,
Irradiating the first UV curable adhesive with UV to form a first adhesive layer;
The metal thin film layer side of the transfer film on which the metal thin film layer is laminated is polymerized on the back surface side of the base film including the first adhesive layer and heated to the first adhesive layer only by pressure without heating. Transfer layer,
The back side of the base film including the transferred metal thin film layer is coated with the second UV curable adhesive by printing, and further a transparent release film is laminated,
Irradiating the second UV curable adhesive with UV from the release film side to form a second adhesive layer to be adhered to the surface of the synthetic resin molded product,
It is said.
In addition, the thing of the structure by which the metal thin film layer was laminated | stacked through the peeling layer can be used for a transfer film.

According to the manufacturing method, the first adhesive layer and the second adhesive layer are formed by partially printing a UV curable adhesive in a predetermined pattern and irradiating it with UV. The process such as heating can be formed in a short time without necessity, and the transfer of the metal thin film layer to the first adhesive layer can be achieved in a short time only by pressure without heating,
Without including the manufacturing process of the base paper, the printing process, the transfer process of the metal thin film layer, etc., including the formation of the adhesive layer, the lamination process,
The label can be manufactured at a low cost on an integrated line along the steps described in the following (1) to (5).
(1) A printing layer is formed and laminated in a predetermined pattern on the front side or the back side of the base film by printing.
(2) A first UV curable pressure-sensitive adhesive is partially laminated in a predetermined pattern on the back side of the base film by printing, and UV is irradiated to form a first pressure-sensitive adhesive layer.
(3) The transfer film on which the metal thin film layer is laminated is polymerized on the back surface side of the base film including the first adhesive layer, and the first adhesive is obtained only by pressure (by the cold stamp method) without heating. Transfer the metal thin film layer to the layer.
(4) A second UV curable pressure-sensitive adhesive is coated on the back side of the base film including the transferred metal thin film layer by printing.
(5) A transparent release film is laminated on the coating layer of the UV curable pressure-sensitive adhesive, and the second UV curable pressure-sensitive adhesive is irradiated with UV from the side of the release film and adhered to the surface of the synthetic resin molded product. A second adhesive layer is formed.
  Moreover, it is also possible to add a process of punching a label after the processes (1) to (5) as an integrated line.

According to the label obtained by the above production method, since the printed layer is laminated on the back surface of the synthetic resin base film on the outermost surface side, damage such as scratches due to rubbing of the printed layer can be obtained without adding a protective layer. It can be surely prevented.

Further, as will be described later, the first adhesive layer is an adhesive layer obtained by curing the first ultraviolet curable adhesive by irradiation with ultraviolet rays, and the first adhesive layer is formed by the so-called cold stamping method only by pressure without heating. The metal thin film layer can be transferred from the transfer film to the back side of the substrate film via the layer, and the label can be printed, including the printing process of the printing layer, the transfer process of the metal thin film layer, and the stamping process of the label. It is possible to manufacture on an integrated line.

In addition, in the said structure or subsequent description, in order to clarify the layer structure of a label, the directionality of the layer structure called the surface side or the back surface side is shown for convenience, for example, the back surface side of a base film. Although the terminology is used, the back side is the side to be attached to the surface of the molded product, and the front side is the opposite side.
In the above configuration, or in the following description, the first and second ultraviolet curable pressure-sensitive adhesives and the second ultraviolet curable pressure-sensitive adhesive, or the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer are used. Are merely used to distinguish both UV-curable pressure-sensitive adhesives from both pressure-sensitive adhesive layers.
In the following description, for example, ultraviolet light is abbreviated as UV so that the first ultraviolet curable pressure sensitive adhesive is the first UV curable pressure sensitive adhesive.

Since the present invention has the above-described configuration, the following effects can be obtained.
That is, the characteristic of the label obtained by the production method of the present invention is that a base film made of synthetic resin is laminated on the outermost surface side, and an acrylic resin or a transfer foil including a conventional metal thin film layer is used. There are no problems such as pinholes and cracks that cannot be avoided with a conventional protective layer with a thickness of about 1 micrometer formed by applying an epoxy resin. It is possible to effectively suppress problems such as erosion, corrosion, cracking, and kinking of the metal thin film layer due to adhesion of objects, etc., and to maintain the decoration property of the metal thin film layer beautifully without deteriorating for a long time. it can.
Moreover, since the function of the protective layer is exhibited by the base film, it is not necessary to laminate a protective layer separately, the layer configuration can be simplified as a whole, and the cost can be reduced.

Further, according to the production method of the present invention, the first adhesive layer and the second adhesive layer are formed and laminated by printing a UV curable adhesive and irradiating with ultraviolet rays. step can also be formed in a short time without the need, also can be achieved in a short time simply by pressure without heating in the first transfer even cold stamping of the metal thin film layer to the adhesive layer,
A label can be manufactured at a low cost with an integrated line without making the manufacturing process of the base paper, the printing process, the transfer process of the metal thin film, etc. separate processes including the formation of the adhesive layer and the lamination process.

It is sectional drawing which shows the layer structure of an example of the label obtained by the manufacturing method of this invention. It is sectional drawing which shows the layer structure of the transfer film used for the label of FIG. It is a schematic diagram illustrating one embodiment of a method of manufacturing the labels of the present invention. It is sectional drawing which shows the typical layer structure of the label used conventionally. It is sectional drawing which shows the typical layer structure of the transfer film conventionally used.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing a layer structure of an example of a label obtained by the production method of the present invention, and its basic layer structure is in order from the surface side (from the top in the figure),
It has a laminated structure of “base film 2 / first adhesive layer 4a / transfer foil 11t (peeling layer 13 / metal thin film layer 15) / second adhesive layer 4b / peeling film 6”.
A printed layer 3 is also laminated on the back side of the base film 2.

And in this example ,
The base film 2 is a transparent, non-stretched film (CPP film) made of polypropylene resin, and the film thickness is 50 micrometers.
The first pressure-sensitive adhesive layer 4a is a layer obtained by partially laminating an acrylic first UV-curable pressure-sensitive adhesive in a predetermined pattern by printing and curing by UV irradiation, and the layer thickness is 1 micrometer. .
Similarly to the first adhesive layer 4a, the second adhesive layer 4b is a layer obtained by laminating an acrylic second UV curable adhesive by printing and curing by UV irradiation, and the layer thickness is 3 micrometers. It is.
Moreover, the peeling film 6 uses the transparent stretched film (OPP film) made from a polypropylene resin, and the film thickness is 30 micrometers.
Moreover, the silicone resin is apply | coated to the surface which contact | connects the 2nd adhesion layer 4b of the peeling film 6. FIG.

FIG. 2 is a cross-sectional view showing a layer structure of the transfer film 11 used in the label 1 of FIG. 1 and has a layer structure of [base film 12 / peeling layer 13 / metal thin film layer 15].
In this example ,
A film made of PET resin is used for the base film 2 and the film thickness is 16 micrometers.
The release layer 13 is a wax system and has a layer thickness of about 0.5 micrometers.
The metal thin film layer 15 is formed by laminating aluminum by a vacuum vapor deposition method and has a thickness of about 0.05 micrometers.
Here, this transfer film 11 does not have layers corresponding to the protective layer 114 and the adhesive layer 116 in the layer configuration of the conventional hot stamp transfer film 111 shown in FIG. 5, and has a simple layer configuration. .

  When the label 1 having the layer configuration of FIG. 1 is applied to the surface of a molded product such as a synthetic resin container, the release film 6 is peeled off and the second adhesive layer 4b is applied by pressure without heating. It can stick to the surface of a synthetic resin molded product.

Next, FIG. 3 is one embodiment of a manufacturing method of the label of the present invention, a schematic illustration of a manufacturing process of the label 1 Figure 1, the label 1 having a layer configuration shown in Figure 1, roughly shown As described above, it can be manufactured in an integrated line comprising the following steps P1 to P6.
-Process P1 (printing process of printing layer 3)
The printing layer 3 is formed by printing on the back surface side (upper surface side in FIG. 3) of the base film 2 subjected to the corona treatment.
In this embodiment, printing is performed using a UV curable ink by a flexographic printing machine, and then the ink is cured by UV irradiation, and the printed layer 3 is arranged so that the designed letters A to H are arranged on the circumference. Forming.
The printing method is not limited to the flexo method, and a known method such as a dry offset method or a relief printing method can be used.
Since the first pressure-sensitive adhesive layer 4a and the second pressure-sensitive adhesive layer 4b are formed by UV irradiation after printing of the UV-curable pressure-sensitive adhesive, the UV-curable ink is used for printing the print layer 3 in consideration of the production by the integrated line. Is preferably used.

-Process P2 (formation of 1st adhesion layer 4a, lamination process)
On the back side of the substrate film 2, partially stacking the first UV curable adhesive A Ri by the printing in a predetermined pattern (star in this embodiment), the first adhesive layer with UV radiation 4a is formed .
In this example, an acrylic UV curable adhesive was used as the first UV curable adhesive A, and a predetermined pattern was printed by a flexographic printing machine.
As the UV curable adhesive, other epoxy-based adhesives can be used.
Also, a printing method such as offset printing can be adopted.

・ Process P3 (Metal thin film layer transfer process)
The metal thin film layer 15 side of the transfer film 11 having the layer configuration shown in FIG. 2 is polymerized on the back surface side of the base film 2 including the first adhesive layer 4a, and only by pressure without being heated by a pressure roll. , transferred to the first adhesive layer 4a formed in the pattern of a predetermined (star) the transfer foil 11t in step P2.

-Process P4 (2nd UV curable adhesive B coating process)
It is transferred to the pattern of a predetermined (star) in step P3, on the back side of the substrate film 2 comprising a laminated transfer foil 11t, covering the second UV curable adhesive B by printing.
In this example, an acrylic UV curable pressure sensitive adhesive was used as the second UV curable pressure sensitive adhesive B, and printing was performed using a flexographic printing machine.
As the UV curable adhesive, other epoxy-based adhesives can be used.
Also, a printing method such as offset printing can be adopted.

-Process P5 (Lamination of release film 6 and formation process of second adhesive layer 4b)
A transparent release film 6 is laminated on the coating layer of the second UV curable adhesive B printed in Step P4, and UV is irradiated from the release film 6 side to form a second adhesive layer 4b.
Here, after the second UV curable pressure sensitive adhesive B is coated and irradiated with ultraviolet rays, a transparent release film may be laminated.
In this example, an OPP film having a thickness of 30 micrometers and being transparent was used as the release film 6. Moreover, the silicone resin is apply | coated to the surface which contact | connects the 2nd adhesion layer 4b of the peeling film 6. FIG.

Process P6 (label punching process)
A punching process is performed into a predetermined label shape (rectangular shape in FIG. 3), unnecessary portions are removed while being wound, and the necessary label portions are wound together with the release film 6 to form a roll.
In the label 1 of FIG. 1, the base film 2 and the second adhesive layer 4b are punched into a rectangular shape while leaving the release film 6.

Having described the construction and operational effects of the present invention along the example method of manufacturing a label of the present invention is limited to these examples as described individually among the description so far It is not a thing.
For example, in the above examples, a CPP film was used as the base film for the label, and an OPP film was used as the release film. However, in consideration of the functions of the base film and the release film, punching workability, label stickability, production line suitability, etc. Other synthetic resin films can be selected as appropriate.
In addition, the UV curable adhesive can be selected in consideration of printing characteristics and adhesiveness after curing, and the adhesiveness can be adjusted by the UV irradiation amount.

The label manufacturing process of the present invention is a process in which, for example, the order of the process P1 and the process P2 is changed in consideration of the overall production efficiency in the integrated production line of the label 1 including the process P1 to the process P6 described above. The punching process of P6 can also be carried out in a separate line, and various variations can be made within the scope of the present invention in consideration of the decoration of the label and productivity.
Moreover, not only the color tone peculiar to a metal thin film layer but a 1st adhesion layer and a metal thin film layer can be laminated | stacked on a halftone colored printing layer, and it can also be set as the decoration which has the metallic luster colored arbitrarily.

As described above, the label obtained by the manufacturing method of the present invention effectively suppresses the occurrence of erosion, corrosion, cracking, peeling, etc. of the metal thin film layer due to the adhesion of contents and the like. It can be maintained beautifully without losing its decorative properties for a long period of time, and can be manufactured at low cost by production on an integrated line, and is expected to be widely used in the field of synthetic resin containers.

1; label 2; substrate film 3; printed layer 4a; first adhesive layer 4b; second adhesive layer 6; release film A; first ultraviolet (UV) curable adhesive B; second ultraviolet ( UV) curable adhesive 11; (for cold stamping) transfer film 11t; transfer foil 12; the substrate film 13; peeling layer 15; the metal thin film layer 101; adhesive label 102; substrate film 103; printed layer 104; adhesive layer 106; Release paper 111; Transfer film 111t (for hot stamping); Transfer foil 112; Base film 113; Release layer 114; Protective layer 115; Metal thin film layer 116; Adhesive layer

Claims (2)

A first ultraviolet curable pressure-sensitive adhesive (A) is partially laminated in a predetermined pattern on the back side of the transparent base film (2) by printing, and then the first ultraviolet curable pressure-sensitive adhesive (A ) Is irradiated with ultraviolet rays to form the first adhesive layer (4a), and then the metal thin film layer (15) side of the transfer film (11) on which the metal thin film layer (15) is laminated is The metal thin film layer (15) is transferred to the first pressure-sensitive adhesive layer (4a) only by pressure without being polymerized and heated on the back side of the base film (2) including the pressure-sensitive adhesive layer (4a). The back surface of the base film (2) containing the metal thin film layer (15) is coated with the second UV curable pressure sensitive adhesive (B) by printing, and further a transparent release film (6) is laminated. Next, the second adhesive layer (4b) is formed by irradiating the coating layer of the second ultraviolet curable adhesive (B) from the side of the release film (6) with ultraviolet rays and sticking it to the surface of the synthetic resin molded product. A labe characterized by The method of production. The method for producing a label according to claim 1, wherein the transfer film (11) has a structure in which a metal thin film layer (15) is laminated on a base film (12) with a release layer (13) interposed therebetween.

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