JP3428163B2 - Hologram seal and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel hologram seal and its manufacturing method. Specifically, by using a relief type hologram, it is excellent in visual effects and decorativeness, it is difficult to forge the seal itself, and it is a hologram seal with high tampering prevention effect, and the seal with extremely good processability and productivity. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, it has been stipulated that some kind of tamper-proof packaging be applied to pharmaceutical products in accordance with Article 58 of the Pharmaceutical Affairs Law and Article 59 of the Ordinance for Enforcement of the Pharmaceutical Affairs Law. In addition, the importance of tamper-proof packaging for food has been reassessed due to the occurrence of poisonous incidents in past sweets.

Examples of the tamper-proof packaging technique include blister packaging, strip packaging, shrink packaging, breakable cap, tape or seal sealing, and sealing carton. Among them, the method using tape or seal sealing is the conventional packaging. Since there is little need to change the form and it is used additionally, it is widely adopted as a simple method.

However, in the conventional tampering prevention seal, the seal itself is poor in decorativeness and its function is aside, and it is relatively easy to imitate the design.

In view of these problems, the present questioner has proposed a tampering prevention tape using a hologram.
(JP-A-63-106780)

The above-mentioned application describes "a hologram having a structure in which a resin layer having a relief hologram formed thereon, a metal reflection layer, a release varnish layer formed by printing in a desired shape, and a pressure-sensitive adhesive layer are sequentially laminated on one surface of a transparent plastic film. “Tape”, which is “when the tape is attached to the adherend and then peeled off,
An image of the relief hologram partially peeled off according to the shape of the peeling varnish remains, and it is obvious that the tape has been peeled off, and it is impossible to restore the tape to the original state, and the tampering prevention effect is excellent. Is disclosed.

[0007]

However, in the above application, in order to remove the relief hologram in a predetermined pattern by peeling the seal, it is necessary to provide a peeling varnish layer.

In consideration of the decorativeness of the surface of the product to which the hologram sticker is attached, not as a tampering prevention effect but as a decorative effect, if a hologram sticker having a desired shape is provided on the product surface, a shape other than the desired shape is provided. A peeling varnish layer will be provided on.

According to the configuration of the above-mentioned application, only the shape of the hologram sticker attached to the product surface can be arbitrarily changed, but the pattern (in this case, a single hologram image) provided on the sticker cannot be changed. .

Further, since the hologram is formed by the hot press method, there are problems that the number of processing steps is large and the productivity is low.

The present invention has been made in view of the above problems, and provides a hologram seal which is excellent in visual effects and decorativeness, is difficult to forge the seal itself, and has a high tampering prevention effect, and is easy to process. -It aims at providing the manufacturing method of the said seal | sticker which is extremely favorable in productivity.

[0012]

In order to achieve the above object, in the present invention, the surface of the above-mentioned portion is subjected to dry surface treatment such as corona discharge or plasma on an arbitrary patterned portion of the hologram forming surface. After the modification, a metal reflection layer, a pressure-sensitive adhesive layer, and a release paper are laminated in this order on the hologram formation surface to form a hologram seal.

In manufacturing the hologram seal, the relief type hologram is formed by melt extrusion of a thermoplastic resin (or a laminated sheet of a thermoplastic resin and a transparent substrate) without using a method of heating and pressing a thermoplastic resin sheet. From the viewpoint of workability and productivity, it is preferable to perform it simultaneously with molding.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory view showing an outline of a production line of a thermoplastic resin sheet having a relief hologram formed on its surface.

That is, the thermoplastic resin 11a extruded from the T-die 2 of the melt extrusion molding machine 1 is pressed between a cooling roll 3 having a relief type hologram stamper 5 mounted on its surface and a nip roll to cool it. By doing so, relief holograms are continuously formed on the surface of the thermoplastic resin 11a.

As a result, a thermoplastic resin sheet 11 having a relief hologram formed on the surface thereof is continuously obtained as shown in the cross-sectional explanatory view of FIG.

Next, using the apparatus (in this case, an example of a corona discharge treatment apparatus) schematically shown in FIG.
The relief hologram forming surface on 1 is subjected to surface modification treatment in a desired pattern.

That is, corona discharge treatment is performed between the relief hologram forming surface on the sheet 11 and the treatment electrode 9 through the mask 19 having a desired pattern of openings. In the figure, the mask 19 has an endless belt shape that moves in synchronization with the sheet 11,
Although it is preferable in terms of productivity, the mode of the mask 19 is not limited to that shown in FIG.

An example of a desired pattern of openings formed in the mask 19 is shown in the plan view of FIG. In this case, the opening 19 'is formed in a diagonal stripe shape, and the relief hologram forming surface on the sheet 11 is subjected to corona discharge treatment at the portion corresponding to the opening 19'. Needless to say, the shape of the opening 19 'can be arbitrarily changed according to the pattern to be produced.

Then, after the metal reflection layer 12 is provided on the relief hologram forming surface on the sheet 11 by a known method such as vapor deposition and sputtering, the pressure sensitive adhesive layer 1 is formed.
By coating 4 and laminating the release paper 15, the hologram seal 20 as shown in the cross-sectional explanatory view of FIG. 5 is obtained. In the figure, the part that has been subjected to corona discharge treatment is 1
1'is shown schematically.

As another manufacturing method, as shown in FIG. 7 showing the outline of the laminated sheet manufacturing line, the transparent substrate sheet 13 is extruded from one side thereof by a T-die 2 of a melt extrusion molding machine 1. The relief type hologram is continuously formed on the surface of the resin 11a by coating the thermoplastic resin 11a and pressing the stamper 5 of the relief type hologram between the cooling roll 3 and the nip roll 4 mounted on the surface. To be done.

As a result, a laminated sheet 17 having a relief hologram formed on the surface thereof can be continuously obtained as shown in the sectional view of FIG. Here, the transparent substrate sheet 1
3 has a desired pattern 16 on the surface of the thermoplastic resin 11 side.
Are printed.

Next, the metal reflection layer 12 is formed on the relief hologram forming surface on the laminated sheet 17 in the same manner as above.
After providing by a known method such as vapor deposition / sputtering,
By coating and forming the pressure-sensitive adhesive layer 14 and stacking the release paper 15, a hologram seal 30 as shown in the cross-sectional explanatory view of FIG. 9 is obtained.

As the thermoplastic resin 11 usable in the present invention, it is necessary to accurately reproduce the fine irregularities on the stamper 5 of the relief type hologram mounted on the surface of the cooling roll. A system resin, especially a polyethylene resin and a polypropylene resin can be preferably used.

However, when forming a relief type hologram, it is preferable to contain no additive which may adhere to or contaminate the stamper or change the surface tension of the resin. The thickness of the resin sheet 11 is 10 μm to 100 in terms of workability.
μm is most preferred.

The thermoplastic resin sheet 11 or the laminated sheet 17 prepared by using the above method and resin.
The surface tension of the relief type hologram forming surface before the above-mentioned surface treatment (corona discharge treatment, etc.) is usually 33 dyn.
/ Cm or less, no special operation is required to adjust the surface tension.

As the above-mentioned surface treatment, the surface tension of the relief type hologram forming surface after the treatment is 43 dyn / cm.
The above modification is desirable, and a dry treatment such as corona discharge treatment or plasma treatment is desirable as a treatment method. This is because wet processing such as primer coating or chemical treatment may cause the fine relief of the relief hologram to disappear.

The metal reflection layer 12 is preferably a metal having a high surface reflectance, and specifically, aluminum, gold, silver, copper or the like and alloys containing these metals can be used.
The well-known vacuum deposition method, sputtering method,
It can be provided by a method such as an ion plating method. A suitable thickness range is 100Å to 10,000Å.

The pressure-sensitive adhesive layer 14 shows a good adhesive force to the metal reflection layer 12, and when it is attached to the adherend 18, it is easily adhered by pressure and when the seal is peeled off. Must be one that does not separate from the interface with the adherend 18.

As the composition, generally used acrylic, rubber, vinyl, silicon and the like can be used, and varnished with an appropriate solvent is used.
Apply and dry by roll coating, blade coating, die coating, gravure coating, etc.
It is suitable to form the film having a thickness in the range of m (preferably 20 μm to 30 μm).

The release paper 15 is provided to protect the pressure-sensitive adhesive layer 14 until it is attached to the adherend 18, and when the release paper 15 is attached to the adherend 18, the thermoplastic resin sheet 11 or the laminated sheet is laminated. Without peeling off the interface between the relief type hologram forming surface of the sheet 17 and the metal reflection layer 12,
Although it must be peelable from the interface with the pressure-sensitive adhesive layer 14, a commonly used silicone release paper or the like can be used, and the pressure-sensitive adhesive layer 14 is laminated immediately after printing.

Transparent substrate sheet 1 as laminated sheet 17
Films such as polyester film, polypropylene film, nylon film, polystyrene film, polycarbonate film, and cellophane can be used for 3, but they are thick due to their characteristics such as surface smoothness, transparency, surface resistance, versatility, processability, and economy. A biaxially stretched polyester film having a thickness of 12 μm to 150 μm or a biaxially stretched polypropylene film is most suitable.

Further, as shown in FIG. 8, FIG. 9, FIG. 10, etc., a print layer 16 having a desired pattern is provided in advance on the surface of the transparent substrate sheet 13 to combine the print image and the hologram image. It is also possible to prevent tampering and improve decorativeness.

Printing in this case can be carried out by both a method of extruding a thermoplastic resin on the laminated surface as shown in the figure and a method of performing it on the opposite surface (not shown), which is suitable for the transparent substrate sheet. The existing ink may be printed by a known method such as gravure printing. However, when printing on the extruded laminated surface, it is necessary to select the ink in consideration of the adhesiveness with the thermoplastic resin.

When a thermoplastic resin is extruded and laminated on a transparent substrate sheet, an adhesive layer may be provided in advance on the laminated surface of the transparent substrate sheet in order to improve adhesiveness.

When using the hologram seal, the release paper of the seal is peeled off and the pressure-sensitive adhesive layer is pressure-bonded to the surface of the adherend 18. (See Figures 6 and 10)

For example, when the peeling is performed for the purpose of falsification, peeling occurs at the interface between the metal reflection layer 12 and the thermoplastic resin layer 11 in the portion where the surface treatment is not performed.

As a result, the metal reflection layer 12 (on which relief-type holograms are recorded) is left on the surface of the adherend 18 except for the portion subjected to the surface treatment in an arbitrary pattern.

As a result, it is obvious that the tape has been peeled off, and it is impossible to restore it to its original state, thus preventing alteration. In this case, as the pattern, for example, by using a character pattern such as "used" or "peeled", if tampering is attempted, the metal reflective layer will come off in the character pattern, so use Will alert the person.

Further, the present seal can be used not only for the purpose of preventing tampering but also for improving the decorative effect. That is, it is possible to provide a hologram pattern having a desired shape on the article surface by peeling off the tape in accordance with the pattern.

The structure and manufacturing method of the hologram seal of the present invention have been described above. The strength of the adhesive force at each interface is summarized as follows.

(1) Group Pressure-sensitive adhesive layer 14 and release paper 15

(2) Group Thermoplastic resin 11 and metal reflective layer 12

(3) Group Transparent substrate sheet 13 and thermoplastic resin 11 Transparent substrate sheet 13 and printing ink 16 Printing ink 16 and thermoplastic resin 11 Metal reflective layer 12 and pressure sensitive adhesive layer 14 Pressure-sensitive adhesive layer 14 and adherend 18

(4) Group Surface-treated part 11 'of thermoplastic resin and metal reflective layer 12

(1) Group <(2) Group <
(3) Group <(4) Group

[0047]

The adhesive strength between the hologram forming surface and the metal reflective layer differs between the surface-treated portion and the non-treated portion (modified portion and non-modified portion). Therefore, when the seal is applied to the adherend and then peeled off, the metal reflective layer in the modified portion is also peeled off, and the metal reflective layer in the non-modified portion remains on the surface of the adherend.

Further, the pattern can be easily changed by selecting the modified portion through a mask having a patterned opening. (Claim 8)

When the seal is peeled off, the image of the partially peeled hologram remains on the adherend, and it is obvious that the seal is peeled off, and the peeled interface has no re-adhesiveness. Therefore, it is impossible to restore it as it was.

By modifying the surface tension of the desired patterned thermoplastic resin sheet to 43 dyn / cm or more by surface treatment such as corona discharge or plasma, the adhesive strength with the metal reflection layer can be improved, and The adhesive strength with the metal reflection layer can be made different between the portion and the other portion. (Claim 7)

By forming a desired pattern by printing on the surface of the transparent substrate sheet, it is possible to expect further prevention of forgery and falsification due to the synergistic effect of the two decorative images (hologram image and printed image). (Claim 3)

[0052]

EXAMPLES The present invention will now be described in more detail by way of examples.

Example 1 Using the apparatus shown in FIG. 1, a low density polyethylene resin (M-10
P; Mitsui Petrochemical Industry Co., Ltd.) under the following processing conditions (A)
By a T-die to a thickness of 50 μm, and by pressing and cooling with a cooling roll and a nip roll having a relief type hologram stamper mounted on the surface, a thermoplastic resin as shown in the cross-sectional explanatory view of FIG. Sheets were obtained in succession.

(A) Extrusion processing conditions (a) Apparatus: The apparatus shown in FIG. (B) Extruder: ψ = 60 mm, L / D = 26 (c) Nip roll: Urethane rubber roll (rubber hardness 8
5 degrees) (d) Temperature setting of extruder (a) Cylinder 1 temperature: 180 ° C (b) Cylinder 2 temperature: 240 ° C (c) Cylinder 3 temperature: 270 ° C (d) Adapter temperature: 280 ° C (e) T -Die temperature: 280 ° C (e) Cooling roll temperature: 15 ° C (f) Extrusion thickness: 50 μm (g) Air gap: 90 mm (h) Nip pressure (air gauge pressure): 4 kgf / cm ²

Next, on the relief type hologram forming surface of this thermoplastic resin sheet, a width of 5 mm and a pitch were set by using the corona discharge treatment device and the endless belt 19 (mask) made of silicon rubber shown in FIGS. Corona discharge treatment was applied to the 10 mm striped openings 19 '.

Then, aluminum is vapor-deposited on the relief hologram forming surface of the thermoplastic resin sheet to a thickness of about 800Å, and a varnish having the following composition (B) is applied and formed on the aluminum vapor-deposited surface by a roll coater.
After forming a pressure-sensitive adhesive layer having a thickness of about 20 μm, silicone release paper was laminated to obtain a hologram seal as shown in the cross-sectional explanatory view of FIG.

[0057]

The seal was cut into 50 mm square pieces, the release paper was peeled off, and the release paper was attached to coated paper (256 g / m ² ). As a result, a hologram image was visually recognizable through the thermoplastic resin sheet.

Next, as shown in FIG. 6, when this was tried to be peeled off, the coated paper had a width of 5 mm corresponding to the untreated portion of the relief hologram forming surface, and an interval of 5 mm.
The image of the hologram remains in a stripe shape, and the hologram image (metal reflection layer) of the other portion (corresponding to the surface-treated portion) is peeled off together with the thermoplastic resin sheet. Further, it was attempted to restore this to the original state, but it was impossible because the peeled interface had no re-adhesion.

<Example 2> Using the apparatus shown in FIG. 7, a gravure printing machine was used in advance to form a print layer having a desired pattern by using a chlorinated polypropylene ink, and a thickness of 30 was obtained.
μm biaxially oriented polypropylene film (P2108;
Polypropylene resin (FL25T; manufactured by Mitsubishi Yuka Co., Ltd.) as a thermoplastic resin on the printed surface of Toyobo Co., Ltd.
With a thickness of 30 μm from the T-die under the following processing conditions (C)
The sheet was extruded into a sheet having a thickness of m, and pressed by a cooling roll and a nip roll having a relief type hologram stamper on the surface to cool the laminated sheet as shown in the sectional explanatory view of FIG.

(C) Extrusion processing conditions (a) Device: The device of FIG. (B) Extruder: ψ = 60 mm, L / D = 26 (c) Nip roll: Urethane rubber roll (rubber hardness 8
5 degrees) (d) Temperature setting of extruder (a) Cylinder 1 temperature: 180 ° C (b) Cylinder 2 temperature: 240 ° C (c) Cylinder 3 temperature: 270 ° C (d) Adapter temperature: 280 ° C (e) T -Die temperature: 280 ° C (e) Cooling roll temperature: 15 ° C (f) Extrusion thickness: 30 μm (g) Air gap: 90 mm (h) Nip pressure (air gauge pressure): 4 kgf / cm ²

Next, the relief type hologram forming surface of this laminated sheet was subjected to corona discharge treatment in a pattern using the same corona discharge treatment device as in Example 1 and the endless belt 19 (mask) made of silicon rubber. gave.
In this embodiment, a mask (not shown) having openings in a character pattern of "opened" is used as the pattern.

Next, aluminum is vapor-deposited to a thickness of about 800 Å on the relief hologram forming surface of the laminated sheet, and the same varnish as in Example 1 is applied and formed on the aluminum vapor-deposited surface by a roll coater to obtain a thickness. After forming a pressure-sensitive adhesive layer having a thickness of about 20 μm, silicone release paper was laminated to obtain a hologram seal as shown in the cross-sectional explanatory view of FIG.

The seal was cut into 50 mm square, the release paper was peeled off, and the release paper was pasted on a coated paper (256 g / m ² ). , Both patterns were visible.

Next, as shown in FIG. 10, when it was attempted to peel it off, a hologram image (in the opened letter pattern) corresponding to the unprocessed surface of the hologram forming surface was formed on the coated paper. The metal reflection layer) remained, and the image of the hologram and the printed layer of the other portion (the character pattern portion of “opened” corresponding to the surface-treated portion) were peeled off together with the laminated sheet. Further, it was attempted to restore it to the original state, but it was impossible because the peeled interface had no re-adhesion.

[0066]

As described above, a hologram seal is provided which has excellent visual effects and decorativeness, is difficult to forge the seal itself, and has a high tampering prevention effect.

Further, since sheet formation of a thermoplastic resin by melt extrusion molding and formation of a relief hologram on the surface of the thermoplastic resin can be carried out at the same time, a method for producing the above-mentioned seal having excellent processability and productivity is provided. It was

It can be said that the hologram sticker of the present invention is industrially effective as a tampering prevention sticker for medicines, foods and the like.

[0069]

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of a production line for a thermoplastic resin sheet.

FIG. 2 is an explanatory cross-sectional view of a thermoplastic resin sheet on which a relief hologram is formed.

FIG. 3 is an explanatory diagram showing an outline of a surface treatment apparatus.

FIG. 4 is an explanatory diagram of a mask for performing a surface treatment in a pattern.

FIG. 5 is a cross-sectional explanatory view of a hologram seal.

FIG. 6 is an explanatory cross-sectional view showing a state in which the seal has been attached and then peeled off.

FIG. 7 is an explanatory view showing an outline of a laminated sheet production line.

FIG. 8 is an explanatory cross-sectional view of a laminated sheet on which a relief hologram is formed.

FIG. 9 is a cross-sectional explanatory view of a hologram seal.

FIG. 10 is an explanatory cross-sectional view showing a state in which a seal is attached to an adherend and then peeled off.

[Explanation of symbols]

1 ... Melt extrusion molding machine 2 ... T-die 3 ... Cooling roll 4 ... Nip roll 5 ... Relief type hologram stamper 6 ... Take-up roll 7 ... Winding roll 8 ... Unrolling roll 9 ... Treatment electrode 10 ... Dielectric roll 11a ... Melt extruded thermoplastic resin 11 ... Thermoplastic resin 11 '... surface-treated part 12 ... Metal reflective layer 13 ... Transparent base material sheet 14 ... Pressure-sensitive adhesive layer 15 ... Release paper 16 ... Printing layer 17 ... Laminated sheet 18 ... Adherend 19 '... Opening (arbitrary pattern) 20, 30 ... Hologram sticker

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-63-106780 (JP, A) JP-A-3-223781 (JP, A) JP-A-6-110376 (JP, A) JP-A-5- 313552 (JP, A) JP-A-2-195373 (JP, A) JP-A-6-202561 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03H 1/18

Claims (10)

(57) [Claims] 1. A relief-type hologram is formed on the surface,
On the hologram-formed surface of the thermoplastic resin sheet, which has been subjected to surface treatment such as corona discharge or plasma, on the desired patterned portion of the hologram-formed surface, the metal reflection layer, the pressure-sensitive adhesive layer, and the release paper are arranged in this order. A hologram seal having a laminated structure, wherein the adhesive strength between the surface of the thermoplastic resin sheet and the metal reflective layer is more than the adhesive strength between the metal reflective layer and the pressure-sensitive adhesive layer. A hologram seal characterized in that the adhesive strength between the surface of the thermoplastic resin sheet not subjected to the surface treatment and the metal reflective layer is larger than the adhesive strength between the metal reflective layer and the pressure-sensitive adhesive layer. . 2. A structure in which a transparent base material sheet is laminated on the thermoplastic resin sheet side of the hologram seal, wherein the adhesive strength between the transparent base material sheet and the thermoplastic resin sheet is:
The hologram seal according to claim 1, wherein the hologram seal is larger than the adhesive strength between the metal reflection layer and the pressure-sensitive adhesive layer. 3. The hologram sticker according to claim 2, wherein a desired pattern is printed on the surface of the transparent substrate sheet. 4. A transparent substrate sheet having a thickness of 12 μm
The hologram seal according to claim 2, which is a biaxially stretched polyester film or a biaxially stretched polypropylene film having a thickness of 150 μm. 5. The hologram seal according to claim 1, wherein the thermoplastic resin is a polyolefin resin. 6. A thermoplastic resin having a surface tension of 33 dyn / cm or less before the surface treatment.
The hologram sticker according to claim 5. 7. The thermoplastic resin sheet having a desired pattern on the hologram forming surface, which has been subjected to a surface treatment such as corona discharge or plasma, has a surface tension of 43 dyn / cm or more. ~ The hologram seal according to claim 6. 8. A thermoplastic resin sheet having a relief hologram formed on its surface is subjected to a surface treatment such as corona discharge or plasma on the hologram forming surface through a mask having openings of desired patterns to form a thermoplastic resin sheet. The surface tension of the portion of the resin sheet corresponding to the opening is 43 dyn / c.
The metal reflective layer, the pressure-sensitive adhesive layer, and a release paper are laminated in this order on the hologram forming surface after modification to m or more. Method of manufacturing hologram seal. 9. A thermoplastic resin extruded from a T-die of a melt extrusion molding machine is pressed between a cooling roll having a relief hologram stamper mounted on its surface and a nip roll to cool the thermoplastic resin. The method for producing a hologram seal according to claim 8, further comprising a step of obtaining a thermoplastic resin sheet having a relief hologram formed thereon. 10. A transparent base material sheet is coated on one side with a thermoplastic resin extruded from a T-die of a melt extrusion molding machine, and between a cooling roll and a nip roll on which a relief hologram stamper is mounted on the surface. The method for manufacturing a hologram seal according to claim 8, further comprising a step of producing a laminated sheet in which a relief hologram is formed on a surface of a thermoplastic resin by pressing with.