JPH08305265A - Fabrication of hologram label - Google Patents

Abstract

PURPOSE: To provide a method for fabricating a hologram label which can be fabricated by use of a melting extrusion molding machine, has good appearance, and can easily be washed and peeled off a container to be recycled. CONSTITUTION: In a method for fabricating a hologram label 20 which is obtained by first accumulating on one side of a base sheet 30 a thermoplastic resin 11 extruded from the T-die of a melting extrusion molding machine, pressing the resin with a cooling roll having the stamper of a relief type hologram mounted on the surface thereof, and cooling the resin to obtain a laminated resin sheet 40 in which the relief type hologram is formed on the surface of the resin 11, and then by providing a metallic reflection layer 12 over the hologram forming face of the sheet 40, laminating the hologram forming face with a paper base 17 via an alkali-soluble binding resin layer 13 to fabricate a hologram forming sheet 50, and then peeling the sheet 40 from the sheet 50, a release agent 14 is applied to the surface of the paper base 17 of the sheet 50 prior to peeling of the sheet 40 from the sheet 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a label having a hologram.

More specifically, it can be used for improving workability and productivity, and when it is attached to a container that requires recovery / regeneration, the label can be easily peeled off by an alkaline solution. The present invention relates to a method for manufacturing a hologram label.

[0003]

2. Description of the Related Art In a relief hologram, a master hologram is formed by recording interference fringes in a concavo-convex shape on the surface of a photosensitive resin by a known method such as a laser beam two-beam interference method.

The hologram stamper is mainly made of metal, and can be obtained by forming a metal layer on the surface of the master hologram surface having fine irregularities by a known method, and then peeling the metal layer.

By mounting such a stamper on the surface of a cooling roll of a resin melt extrusion molding machine and pressing it against the extruded molten resin, a resin sheet having a relief type hologram formed on the surface (a hologram forming sheet and a hologram forming sheet) is formed. The method for producing (referred to as) is known (Japanese Patent Laid-Open No. 62-191872).

On the other hand, labels used in containers that need to be recovered and reused (for example, glass bottles for various alcoholic beverages such as sake and beer) must be capable of being peeled and removed when the bottle is washed with an alkaline solution after recovery. I have to.

However, when the above hologram forming sheet is used as a label for these containers, it is difficult to peel and remove because it is poorly soluble in alkali and poorly suitable for washing in bottles, and thus it is difficult to use.

That is, even if the container is immersed in an alkaline solution for the purpose of cleaning and peeling of the label, the outer layer of the label is mainly a thermoplastic resin, so that the resin interferes with the solution inside the label. Even if the adhesive used for bonding to the container is alkali-soluble, it will take a long time to dissolve the adhesive because the solution penetrates only from the end face side of the label. There was a problem of cost.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and can be produced with high productivity by using a melt extrusion molding machine, has a good appearance, and is washed and peeled from a container to be collected. It is an object of the present invention to provide a method for manufacturing a hologram label that is easy to manufacture.

[0010]

In order to achieve the above object, in the method for producing a hologram label according to claim 1, one side of a substrate sheet is extruded from a T-die of a melt extruder. While laminating the thermoplastic resin, the stamp of the relief type hologram is pressed by a cooling roll mounted on the surface, by cooling, to obtain a laminated resin sheet having a relief type hologram formed on the surface of the resin, The hologram forming surface of the laminated resin sheet is provided with a metal reflection layer, and further laminated with a paper base material via an alkali-soluble adhesive resin layer to prepare a hologram forming sheet. In the method for producing a hologram label obtained by peeling, the laminated resin sheet is peeled from the hologram forming sheet. Before, characterized by applying a release agent in advance paper quality substrate surface of the hologram forming sheet.

In the method for producing a hologram label according to a second aspect of the present invention, the release agent may be one or more of ethyl acetate, water, methanol, ethanol, isopropyl alcohol, methyl ethyl ketone, toluene, benzene, tetrahydrofuran and the like. Is used.

The hologram label manufacturing method according to a third aspect is characterized in that biaxially oriented polypropylene or biaxially oriented polyester is used as the base sheet.

The method for manufacturing a hologram label according to a fourth aspect is characterized in that a polyolefin resin is used as the thermoplastic resin.

The hologram label manufacturing method according to claim 5 is characterized in that, as the thermoplastic resin, a polyolefin resin having a surface tension when dried of 33 dyn / cm or less is used.

The hologram label according to claim 6 is characterized in that a primer layer, a printing layer made of ink, and an overcoat layer made of varnish are provided in this order on the metal reflection layer after the laminated resin sheet is peeled off. And

The method for producing a hologram label according to claim 7 is characterized in that, as the paper base material, a coated paper having an elongation in water of 2.5% or less when immersed in water is used. .

Further, in the method for producing a hologram label according to claim 8, as the alkali-soluble adhesive resin,
It is characterized by using an acrylic / vinyl acetate copolymer resin.

Further, in the method for producing a hologram label according to claim 9, as the alkali-soluble adhesive resin,
It is characterized by using a chlorinated polypropylene resin.

The hologram label manufacturing method according to claim 10 is characterized in that a polyurethane resin is used as the alkali-soluble adhesive resin.

The method for producing a hologram label according to claim 11 is characterized in that a resin obtained by reacting a polyester polyol resin component and a polyisocyanate resin component is used as the polyurethane resin.

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 laminated resin sheet having relief holograms formed on its surface, which is used in the present invention.

That is, the thermoplastic resin 11a extruded from the T-die 2 of the melt extrusion molding machine 1 is supplied to one surface of the base material sheet 30, and at the same time, the relief hologram stamper 5 is mounted on the surface thereof. Cooling roll 3
The relief type hologram is continuously obtained on the surface of the thermoplastic resin 11 by pressing with the nip roll 4 and cooling, and the relief hologram is passed through the take-up roll 6 and taken up by the take-up roll 7.

As a result, a laminated resin sheet 40 having a relief hologram formed on its surface is continuously formed as shown in the sectional view of FIG.

As the base sheet 30 used in the present invention,
Films such as polyester film, polypropylene film, nylon film, polystyrene film, polycarbonate film, and cellophane film can be used, but the thickness is preferable because of the characteristics such as surface smoothness, transparency, surface resistance, versatility, processability, and economy. A biaxially oriented polyester film or a biaxially oriented polypropylene film having a thickness of 12 μm to 150 μm is preferable.

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 cooling roll 3, and the polyolefin resin is required to satisfy these requirements. Resins, especially polyethylene resins and polypropylene resins, can be preferably used. It is preferable that the surface tension at the time of drying is 33 so that the laminated resin sheet 40 can be easily peeled from the hologram forming sheet 50 later.
Polyolefin resin of dyn / cm or less, especially polyethylene resin and polypropylene resin can be used.

However, when forming a relief type hologram, it is preferable not to include an additive which may adhere to or contaminate the stamper or increase the surface tension of the resin. The thickness of the thermoplastic resin 11 is 10 to 100 μ in terms of workability.
m is most preferred.

Next, as shown in FIG. 3, a paper base material 17 is laminated on the hologram forming surface of the laminated resin sheet 40 via the metal reflection layer 12 and the alkali-soluble adhesive resin layer 13, and the hologram forming sheet 50 is formed. To get

The metal reflection layer 12 or the metal vapor deposition layer becomes a hologram forming layer after being laminated with the paper base material 17 and peeling off the laminated resin sheet 40, and a metal having a high surface reflectance is desirable. Specifically, aluminum, gold,
Silver, copper or the like and alloys containing these metals can be used, and they can be provided by a method such as a vacuum deposition method, a sputtering method, an ion plating method and the like which are generally well known. A suitable thickness is in the range of 100 Å to 10,000 Å.

The adhesive resin layer 13 must be alkali-soluble, have adhesiveness with the metal reflective layer 12, and have adhesiveness capable of being laminated on the paper base material 17 at a temperature not higher than the softening point temperature of the thermoplastic resin 11. Is. Examples of such adhesive resin include acrylic resin, methacrylic resin, rosin ester resin, cellulose derivative, polyvinyl acetate,
Chlorinated polypropylene resin, polyurethane resin, ethylene copolymer, acrylovinyl acetate copolymer resin,
One or more of vinyl chloride / vinyl acetate and the like can be used, and a paint prepared with an appropriate solvent is applied to a film thickness by a known method such as a gravure coating method, a roll coating method or a blade coating method. After coating and forming about 1 to 10 μm, it may be laminated with a paper base material by a method such as roll hot pressing.

In addition to these adhesive resins, any resin can be used as long as it has the above-mentioned properties, and as a laminating system, dry laminating, wet laminating, hot melt laminating, non-solvent laminating and the like can be used. By using the method, the lamination of the adhesive resin layer 13 and the lamination of the paper base material 17 can be performed in one step.

FIG. 7 shows a laminated resin sheet 40 on which the metal reflection layer 12 is formed by the dry lamination method and the paper base material 1.
7 shows an outline of a production line in which 7 is laminated.

A polyurethane resin can be used as the adhesive for dry lamination. There are two types of polyurethane adhesive resin, one-component reaction type and two-component reaction type.
A two-liquid reaction type is mainly used. The two-component reaction type is composed of a polyol component having a hydroxyl group at the terminal of a polymer and a polyisocyanate component having an isocyanate group.

Among these, the polyol component is divided into polyester type and polyether type, and when used in the present invention, it is more preferable to use polyester type polyol in consideration of alkali solubility. This is because the ester group of the polyester polyol is easily hydrolyzed by the alkaline solution.

Examples of such polyester polyols include polyethylene adipate, polydiethylene adipate, polypropylene adipate, polytetramethylene adipate, and copolymers of two or more of these.

As the adhesive for wet lamination, polyvinyl acetate emulsion, vinyl acetate copolymer emulsion, acrylic ester copolymer emulsion, polyurethane emulsion and the like can be used.

As the hot melt adhesive, ethylene copolymers (EVA, EEA, EMMA), polyolefin resins, etc. can be used. As the non-solvent laminating adhesive, a one-component or two-component reactive polyurethane adhesive can be mainly used.

Next, as shown in FIG. 4, a release agent 14 is applied to the surface of the paper base material 17 of the hologram forming sheet 50 thus obtained, so that the thermoplastic resin 11 and the metal reflection layer 12 are formed. By moving to the interface, the laminate strength is reduced, and the laminated resin sheet 40 is peeled from the interface with the metal reflection layer 12 as shown in FIG. 5, whereby the hologram label 20 of the present invention is obtained.

The paper base material 17 can be selected in a wide range, but as shown in FIG.
5, coated paper with clay coat layer 16 provided, art paper,
It is more preferable to use a material having good smoothness such as cast coated paper. Further, it is necessary that the elongation in water when immersed in water is 2.5% or less, preferably 1.5% or less.

When the paper base material 17 having an elongation in water of more than 2.5% is used, when it adheres to a beer bottle or the like and is cooled in a refrigerator or the like, water drops adhering to the surface of the bottle cause the metal reflective layer 12 on the paper base material 17 to be reflected. Cracks may occur and the appearance may deteriorate.

In the final step of obtaining the hologram label, the stripping agent 14 used in the present invention transfers the components of the stripping agent to the interface between the thermoplastic resin 11 and the metal reflection layer 12 (see FIG. 5), and the lamination strength of both is increased. Is applied so that the laminated resin sheet 40 is better separated from the interface with the metal reflection layer 12 by lowering the metal content, the paper-based base material 17, the alkali-soluble adhesive resin 13, the metal reflection layer 12, and the metal. It is necessary to contain a component that can migrate to the interface between the reflective layer 12 and the thermoplastic resin 11. As the stripping agent 14 used in the present invention, a composition using one or more solvents such as ethyl acetate, water, methanol, ethanol, isopropyl alcohol, methyl ethyl ketone, toluene, benzene and tetrahydrofuran can be preferably used. . As a coating method for these release agents, a gravure coating method, a roll coating method, a blade coating method or the like can be used.

As for the peeling of the laminated resin sheet 40 from the hologram forming sheet 50, since the peeling agent 14 is used, it can be peeled easily, stably and satisfactorily from the interface with the metal reflection layer 12.

When the release agent 14 is not used, the laminating strength between the laminated resin sheet 40 and the metal reflecting layer 12 becomes larger than the laminating strength between the metallic reflecting layer 12 and the adhesive resin layer 13, and the laminating resin sheet 40 and There is a possibility that peeling may not be performed well at the interface with the metal reflective layer 12.

FIG. 6 shows a structure in which a primer layer 21, a printing layer 22 and an overcoat layer 23 are provided on the metal reflection layer 12 of the hologram label 20 thus obtained to further enhance the surface resistance and the display effect. is there.

The primer layer 21 in this case is a resin having good alkali solubility, and is made of shellac, nitrocellulose resin, mixed resin obtained by adding resin acid ester to nitrocellulose resin, or resin obtained by further adding alkyd resin to the mixed resin. Is preferred.

The printed layer 22 is a nitrocellulose resin,
An ink containing a polyamide resin or a mixed resin thereof as a vehicle and further containing maleic acid.

The overcoat layer 23 is the printed layer 22.
It is an alkali-soluble layer composed of a resin consisting of the vehicle of the ink used in.

[0048]

According to the method of the present invention, the hologram is formed by
Since the melt extrusion molding machine is used, the moldability of the hologram is good, and the component of the release agent coated on the surface of the paper base material of the hologram forming sheet is the thermoplastic resin and the metal reflection layer that form the hologram forming sheet. The laminated resin sheet can be easily, stably and satisfactorily peeled off from the hologram-forming sheet, because the laminate strength of the both is lowered. Further, the laminated resin sheet is peeled off after sequentially laminating the metal reflection layer, the adhesive resin layer and the paper base material on the laminated resin sheet.
Since there is no laminated resin sheet that hinders the permeation of the alkaline solution into the inner layer, cleaning and peeling with the alkaline solution from the collection container can be easily performed.

[0049]

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

Using the apparatus shown in FIG. 1, a polypropylene resin (FL25
T; manufactured by Mitsubishi Petrochemical Co., Ltd.) was extruded under the following conditions (A) from a T-die to a thickness of 30 μm, and a cooling roll having a relief hologram stamper mounted on the surface (roll temperature 15 ° C.) By pressing and cooling with a nip roll, a laminated resin sheet having a relief hologram formed on the surface as shown in FIG. 2 was continuously obtained.

(A) Extrusion processing conditions (a) Device ... The device of FIG.

(B) Extruder ... φ = 60 mm, L / D = 2
6 (c) Nip roll ... Urethane rubber roll (rubber hardness 8
5 °) (d) Extrusion 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 An aluminum vapor deposition layer having a thickness of about 1000 angstrom was formed on the relief hologram forming surface of the obtained laminated resin sheet by a vacuum vapor deposition method.

Next, on the aluminum vapor deposition layer side of the laminated resin sheet, a polyester polyol component (AD8
06; Toyo Morton Co., Ltd.) and a polyisocyanate component (CAT-RT8; Toyo Morton Co., Ltd.), and a basis weight of 6 via an alkali-soluble polyurethane adhesive.
A 4 g / cm ² coated paper (Cormorant VMTS; manufactured by Fuji Kako Co., Ltd.) is laminated under the following processing condition (B) by a dry laminating method using an apparatus as shown in FIG. 7 to form a hologram forming sheet. Obtained.

Next, ethyl acetate (NC401; Toyo Ink Mfg. Co., Ltd.) was applied as a release agent to the paper-like substrate surface of the obtained hologram forming sheet, dried at 40 ° C. for 10 seconds, and then left at room temperature for 10 minutes. After that, the laminated resin sheet was peeled off to obtain a hologram label as shown in the sectional view of FIG.

(B) Dry laminating conditions (a) Device ... Device of FIG.

(B) Adhesive coating method ... Gravure coating method (c) Adhesive coating amount ... 2 g / m ² (d) Drying temperature ... 80 ° C. (e) Heating roll temperature ... 60 ° C. (f) Processing speed 50 m / min (g) Aging: 50 ° C., 4 days [Comparative Example 1] A hologram-forming sheet was prepared using the same apparatus, resin and processing conditions as in the above example, and immediately after that, no release agent was applied. The laminated resin sheet was peeled off to obtain a hologram label. [Comparative Example 2] A laminated resin sheet whose cross section is shown in FIG.
Aluminum was vapor-deposited to a thickness of angstrom, and the same coated paper as that used in the above example was dry laminated on the vapor-deposited surface with a polyurethane adhesive to obtain a hologram label.

Table 1 shows the evaluation results of the transferability (VM transferability), hologram formability, water resistance, and bottle washability of the aluminum vapor deposition layers of the hologram labels of Examples, Comparative Examples 1 and 2.

As can be seen from Table 1, the hologram labels according to the examples of the present invention had excellent performances in all of VM transfer property, hologram moldability, water resistance and bottle washing property. On the other hand, in Comparative Example 1, the VM transfer property was inferior. Further, in Comparative Example 2, since the laminated resin sheet having low alkali permeability was present on the surface, the bottle washing property was poor.

[0059]

[Table 1] (* 1) VM transferability: visual evaluation of VM transfer state [◎: excellent ○: good Δ: acceptable ×: not acceptable] (* 2) hologram formability: visual evaluation of hologram brightness [○ good (bright) △ Acceptable (hologram can be seen but dark) × Impossible (dark)] (* 3) Water resistance: Evaluation of surface condition after immersing the obtained label in water at 25 ° C for 1 hour [○ good (no change) ) △ Acceptable (slightly cracked) × Impossible (large crack)] (* 4) Bottle washability: Label the obtained label on a glass plate with starch paste and immerse it in 70 ° C, 4% NaOH aqueous solution. Time until peeling off [◎ Excellent (within 3 minutes) ○ Good (within 5 minutes) △ Acceptable (within 10 minutes) × Impossible (over 10 minutes)]

[0060]

As described in detail above, according to the present invention, a hologram having good moldability can be efficiently, simply and inexpensively produced by molding the hologram by using a resin melt extrusion molding machine. In addition to the above, a hologram label can be stably produced by applying a release agent to the surface of the paper base material of the hologram forming sheet. Collect this
When used as a label for a container that needs to be reused, a hologram label that can be easily peeled and removed by an alkaline solution can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of a laminated resin sheet production line in the present invention.

FIG. 2 is a cross-sectional view of a laminated resin sheet having a relief hologram formed on its surface.

FIG. 3 is a cross-sectional view of a hologram forming sheet in which a metal reflection layer, an adhesive resin layer, and a paper base material are sequentially laminated on the hologram forming surface of the laminated resin sheet.

FIG. 4 is a cross-sectional view showing a state in which a release agent is applied to a hologram forming sheet.

FIG. 5 is a cross-sectional view showing a state in which the laminated resin sheet is peeled from the hologram forming sheet.

FIG. 6 is a hologram label, a primer layer, a printed layer,
It is sectional drawing of the structure which provided the overcoat layer.

FIG. 7 is an explanatory diagram showing an outline of a dry laminating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melt extrusion molding machine 2 T-die 3 Cooling roll 4,64 Nip roll 5 Relief type hologram stamper 6 Take-up roll 7,66 Winding roll 11a Melt-extruded thermoplastic resin 11 Thermoplastic resin 12 Metal reflective layer 13 Alkali-soluble Adhesive resin layer 14 Release agent layer 15 Base paper 16 Clay coat layer 17,62 Paper material 20 Hologram label 21 Primer layer 22 Printing layer 23 Overcoat layer 30 Base sheet 40 Laminated resin sheet 50 Hologram forming sheet 61 Forming metal reflection layer Laminated resin sheet 63 Adhesive coating section 65 Drying oven 67 Heating metal roll

Claims (11)

[Claims] 1. A thermoplastic resin extruded from a T-die of a melt extrusion molding machine is laminated on one side of a substrate sheet, and a relief type hologram stamper is pressed by a cooling roll mounted on the surface, By cooling, to obtain a laminated resin sheet on which a relief hologram is formed on the surface of the resin, on the hologram forming surface of the laminated resin sheet, a metal reflection layer is provided, further via an alkali-soluble adhesive resin layer, In a method for producing a hologram label obtained by laminating a laminated sheet with a paper base material to produce a hologram forming sheet, and then peeling the laminated resin sheet from the hologram forming sheet, before peeling the laminated resin sheet from the hologram forming sheet. In addition, a hologra characterized in that a release agent is applied to the surface of the paper base material of the hologram forming sheet in advance. Method of manufacturing label. 2. The release agent is one or more of ethyl acetate, water, methanol, ethanol, isopropyl alcohol, methyl ethyl ketone, toluene, benzene, tetrahydrofuran, etc., and is used. Manufacturing method of hologram label. 3. The method of manufacturing a hologram label according to claim 1, wherein biaxially oriented polypropylene or biaxially oriented polyester is used as the base sheet. 4. The method of manufacturing a hologram label according to claim 1, wherein a polyolefin resin is used as the thermoplastic resin. 5. The method for producing a hologram label according to claim 4, wherein a polyolefin resin having a surface tension when dried of 33 dyn / cm or less is used as the thermoplastic resin. 6. A primer layer, an ink print layer, and a varnish overcoat layer are provided in this order on the metal reflective layer after the laminated resin sheet is peeled off. The method for producing a hologram label according to any one of claims. 7. The coated paper having an elongation in water of 2.5% or less when immersed in water is used as the paper base material according to any one of claims 1 to 6. Holographic label manufacturing method. 8. The alkali-soluble adhesive resin,
The method for producing a hologram label according to claim 1, wherein an acrylic / vinyl acetate copolymer resin is used. 9. The alkali-soluble adhesive resin,
The method for producing a hologram label according to any one of claims 1 to 7, wherein a chlorinated polypropylene resin is used. 10. The method of manufacturing a hologram label according to claim 1, wherein a polyurethane resin is used as the alkali-soluble adhesive resin. 11. The method of manufacturing a hologram label according to claim 10, wherein a resin obtained by reacting a polyester polyol resin component and a polyisocyanate resin component is used as the polyurethane resin.