JP3503240B2 - Method for producing bottle-like hologram label - Google Patents

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, and more particularly, to a container which can be improved in workability and productivity and which requires recovery / reproduction. The present invention relates to a method for producing a hologram label, which can be easily peeled and removed with an alkaline solution when it is attached to the hologram label.

[0002]

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

The hologram stamper is mainly made of a thin metal, and can be obtained by forming a metal layer on the fine uneven shape of the master hologram surface by a known method and then peeling it off.

The stamper is mounted on the surface of a cooling roll of a resin melt extrusion molding machine and pressed against the extruded resin in a molten state to form a resin sheet (hologram forming sheet and hologram forming sheet) on which a relief hologram is formed. A method for producing the compound is known (for example, JP-A Nos. 62-191872 and 62-19277).
9).

On the other hand, labels used for 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 off when 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 off and remove it because of its poor suitability for washing bottles, and 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 and the solution becomes an inner layer of the label. Even if the adhesive used for adhesion to the container is alkali-soluble, it takes a long time for the solution to dissolve the adhesive.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and provides a hologram label which can be produced by using a melt extrusion molding machine and which can be easily peeled off by washing from a container for collection. It is intended to provide a manufacturing method.

[0009]

In order to achieve the above object, a method of producing a hologram label according to the invention of claim 1 is such that an alkali-soluble adhesive resin layer and an alkali-soluble adhesive resin layer are provided on a paper base material.
A photomask having a metal reflection layer forming a relief hologram.
In the manufacturing method of the program label,
The coating agent layer <br/> surface of the base sheet provided with coating agent layer preparative peeling, with laminating the thermoplastic resin extruded into a sheet from a T- die melt extruder, relief hologram the stamper is pressed by mounting cooling roll to the surface, by cooling, the thermoplastic surface to form a laminated resin sheet obtained by forming a relief hologram resin, then the relief of the laminated resin sheet
The metal reflection layer is provided on the hologram forming surface, and
Via an adhesive resin layer of the alkali-soluble, creates a hologram forming sheet was laminated with the paper quality substrate, teeth
After mowing, it is characterized by separating the metal reflective layer of the hologram forming sheet from the interface of the laminated resin sheet.

Further, in the method for producing a hologram label according to the invention of claim 2, as the coating agent layer for peeling the laminated resin sheet, one or more kinds of low melting point wax, plasticizer, and low and medium molecular weight activator are used. It is characterized by using.

The method of manufacturing a hologram label according to the invention of claim 3 is characterized in that biaxially oriented polypropylene or biaxially oriented polyester is used as the base material sheet.

The hologram label manufacturing method according to the invention of claim 4 is characterized in that a polyolefin resin is used as the thermoplastic resin.

Further, the hologram manufacturing method according to the invention of claim 5 is characterized in that a primer layer, a printing ink layer and an overcoat layer are provided in this order on the metal reflection layer.

The method for producing a hologram label according to the invention of claim 6 is characterized in that, as the paper base material, coated paper having an elongation in water of 2.5% or less when immersed in water is used. There is.

The method of manufacturing a hologram label according to the invention of claim 7 is characterized in that an acrylic / vinyl acetate copolymer resin is used as the alkali-soluble adhesive resin.

The method of manufacturing a hologram label according to the invention of claim 8 is characterized in that a chlorinated polypropylene resin is used as the alkali-soluble adhesive resin.

The method of manufacturing a hologram label according to the invention of claim 9 is characterized in that a polyurethane resin is used as the alkali-soluble adhesive resin.

Further, the hologram label manufacturing method according to the invention of claim 10 is characterized in that, as the polyurethane resin, a resin obtained by reacting a polyester polyol resin component and a polyisocyanate resin component is used. .

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 a relief hologram formed on its surface used in the present invention.

A coating agent layer 2 for peeling a laminated resin sheet in advance.
The surface of the thermoplastic resin 11 extruded in a sheet shape from the T-die 2 of the melt extrusion molding machine 1 was attached to the surface of the coating agent layer surface of the base material sheet 30 provided with the relief hologram hologram stamper 5. A relief hologram is continuously obtained on the surface of the thermoplastic resin 11 by pressing with the cooling roll 3 and the nip roll 4 and cooling.

As a result, a laminated resin sheet 40 having a relief hologram formed on the surface thereof is continuously formed as shown in the sectional view of FIG. The formed laminated resin sheet 40 passes through the take-up roll 6 and is taken up by the take-up roll 7. Base sheet 3 used in the present invention
As 0, films such as polyester film, polypropylene film, nylon film, polystyrene film, polycarbonate film, and cellophane film can be used, but surface smoothness, transparency, surface resistance,
12 μm to 1 in thickness due to its versatility, processability, economy, etc.
A 50 μm biaxially oriented polyester film or a biaxially oriented polypropylene film can be preferably used.

Coating layer 24 for peeling the laminated resin sheet
In the final step of obtaining the hologram label (see FIG. 4), the components of the coating agent are transferred to the interface between the thermoplastic resin 11 and the metal reflective layer 12 to reduce the laminating strength of the two, thereby forming a laminated resin sheet. 40 is provided for better peeling from the interface with the metal reflection layer 12, and the metal reflection layer 1 is transmitted through the thermoplastic resin sheet 11.
It is necessary to contain a component capable of migrating to the interface with 2, and any one of a low melting point wax, a plasticizer, and a medium and low molecular weight activator, or a composition using two or more thereof can be used. As the plasticizer, phthalic acid derivative, adipic acid derivative, oleic acid derivative, stearic acid derivative, sebacic acid derivative, azelaic acid derivative, phosphoric acid derivative,
Tartaric acid derivatives and TMA derivatives can be used. As a method for applying the coating agent layer 24, methods such as a gravure coating method, a roll coating method, and a blade coating method can be used. The thickness of the coating agent layer 24 is 0.
It is preferably about 5 μm to 10 μm.

The laminated resin sheet 40 and the metal reflection layer 1
If the coating agent layer is provided at the interface with the second layer, the hologram formed on the surface of the laminated resin sheet 40 may be buried and disappear, which is not preferable.

The thermoplastic resin 11 usable in the present invention accurately reproduces fine irregularities on the stamper 5 of the relief type hologram mounted on the cooling roll 3 and preferably has a surface tension during drying of 33 dyn / cm. It is necessary that the components of the coating agent permeate through the thermoplastic resin 11, and a polyolefin resin, particularly a polyethylene resin or a polypropylene resin, can be preferably used as a material satisfying these requirements.

However, when forming a relief type hologram, it is preferable to contain no additive which may adhere to the stamper 5 or contaminate the stamper 5 or increase the surface tension of the resin. The thickness of the thermoplastic resin 11 is 10 to 100 in terms of workability.
μm is most preferred.

The surface tension of the laminated resin sheet 40 having a relief type hologram formed on the surface thereof, obtained by using the above method and resin, is usually 33 dyn /
Since it is not more than cm, no special operation is required for adjusting the surface tension.

As described above, the surface tension value is specified in consideration of the characteristics for favorably peeling from the interface with the metal reflection layer 12 when the laminated resin sheet 40 is peeled off in the subsequent step. That is all.

Next, as shown in FIG. 3, a paper base material 17 (see FIG. 4) is laminated on the hologram forming surface of the laminated resin sheet 40 with the metal reflection layer 12 and the alkali-soluble adhesive resin layer 13 interposed therebetween. Then, the hologram forming sheet 14 is obtained.

The metal reflection layer 12, that is, the metal vapor deposition layer is to be a hologram forming layer after being laminated with the paper base material 17 via the alkali-soluble adhesive resin layer 13 and peeling off the laminated resin sheet 40. A metal having high reflectance is preferable. Specifically, aluminum, gold, silver, copper, or the like and alloys containing these metals can be used, and they are provided by a method such as a vacuum deposition method, a sputtering method, or an ion plating method which is well known. You can A suitable thickness range is 100 to 10,000 angstroms.

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,
One or more of chlorinated polypropylene resins, polyurethane resins, ethylene copolymers, vinyl chloride / vinyl acetate copolymers, etc. can be used, and those made into a paint with an appropriate solvent are gravure coated. Method, roll coating method, blade coating method, etc.
After coating and forming about 0 μm, the paper base material 17 may be laminated 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 the laminating method, there are dry laminating, wet laminating, hot melt laminating, non-solvent laminating and the like. 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.

A polyurethane resin can be used as the adhesive for dry lamination. There are two types of polyurethane adhesive resins, one-component reaction type and two-component reaction type, but the two-component reaction type is mainly used. The two-liquid 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.

Of these, the polyol component is divided into a polyester type and a polyether type. When used in the present invention, it is more preferable to use a 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 typical adhesives for wet lamination, polyvinyl acetate emulsion, vinyl acetate copolymer emulsion, acrylic ester copolymer emulsion, polyurethane emulsion and the like are used.

Typical of hot melt adhesives are ethylene copolymers (EVA, EEA, EMM).
A), polyolefin resin, etc. are used. Also,
As the non-solvent laminating adhesive, a one-component or two-component reactive polyurethane adhesive is mainly used.

Next, as shown in FIG. 4, the hologram forming sheet 14 thus obtained is peeled off from the interface between the laminated resin sheet 40 and the metal reflection layer 12,
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. 4, coated paper, art paper, cast coat in which the clay coat layer 16 is provided on the base paper 15 is used. It is more preferable to use paper having good smoothness such as 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 above-mentioned paper base material having an elongation in water of more than 2.5% is used, the paper base material 17 is adhered to a beer bottle or the like and is cooled in a refrigerator or the like, so that water drops adhere to the bottle surface.
Cracks may occur in the upper metal reflection layer 12 and the appearance may be deteriorated.

Regarding the peeling of the laminated resin sheet 40 from the hologram forming sheet 14, since the surface tension of the laminated resin sheet 40 at the time of drying is 33 dyn / cm or less, it is easier to peel from the interface with the metal reflection layer 12. It can be peeled off.

When the surface tension exceeds 33 dyn / cm, the laminating strength between the laminated resin sheet 40 and the metal reflective layer 12 becomes larger than the laminating strength between the metallic reflective layer 12 and the adhesive resin layer 13, and the laminated resin sheet is formed. In some cases, it may not be peeled off well at the interface between 40 and the metal reflective layer 12.

FIG. 5 shows a structure in which a primer layer 21, a printing ink layer 22 and an overcoat layer 23 are sequentially provided on the hologram label 20 thus obtained to further enhance the surface resistance and the display effect.

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 printing ink layer 22 is formed by using an ink containing a nitrocellulose resin, a polyamide resin or a mixed resin thereof as a vehicle and further adding maleic acid.

The overcoat layer 23 is an alkali-soluble layer made of a resin composed of the vehicle of the ink used for the printing ink layer 22.

[0047]

Since the extrusion coating method using the melt extrusion molding machine is used to form the hologram, the hologram formability is good and the component of the coating agent layer previously coated on the base sheet is thermoplastic of the hologram forming sheet. Since it moves to the interface between the resin and the metal reflection layer, and the laminating strength between the two is reduced, peeling at the interface between the laminated resin sheet of the hologram forming sheet and the metal reflection layer can be easily performed. As a result, the obtained hologram-forming sheet can be peeled off under a wide range of processing conditions. Furthermore, since the laminated resin sheet is peeled off after laminating the laminated resin sheet with the paper-based substrate through the alkali-soluble adhesive resin layer, the outer layer of the formed label prevents the permeation of the alkaline solution into the inner layer. Since there is no such laminated resin sheet, the label can be easily washed and peeled from the collection container with the alkaline solution.

[0048]

EXAMPLES The present invention will now be described in more detail with reference to examples.

An ink containing a low-melting wax, a plasticizer, and a low- and medium-molecular-weight activator (New MAX 39 Indigo: manufactured by Toyo Ink Mfg. Co., Ltd.) is used as a base material sheet as a coating agent layer for peeling a laminated resin sheet. Biaxially oriented polypropylene film with a thickness of 30 μm (P2108: Toyobo Co., Ltd.)
Prepreg) and gravure coated to a thickness of 2 μm.

Using the apparatus shown in FIG. 1, a polypropylene resin (FL25T: manufactured by Mitsubishi Petrochemical Co., Ltd.) as a thermoplastic resin was formed on the coating agent layer for peeling the resin layer of the substrate sheet.
Is extruded from the T-die to have a thickness of 30 μm under the following condition (A), and is pressed and cooled between a cooling roll (roll temperature 15 ° C.) having a relief hologram stamper mounted on the surface and a nip roll. By
A laminated resin sheet having a relief hologram formed on its surface, the cross section of which is shown in FIG. 2, was continuously obtained. (A) Extrusion processing conditions (a) Device ... Device of FIG. 1 (b) Extruder ... φ = 60 mm, L / D = 26 (c) Nip roll ... Urethane rubber roll (rubber hardness 85 degrees) ( 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 / c
m 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.

Then, a coated paper having a basis weight of 64 g / cm ² was formed on the aluminum vapor-deposited layer side of the laminated resin sheet through an acrylic / vinyl acetate copolymer resin adhesive (MC-10: manufactured by Saiden Chemical Co., Ltd.). (COMORAND VMTS: manufactured by Fuji Kako Co., Ltd.) was laminated under the following processing condition (B) by a wet laminating method using an apparatus as shown in FIG. For some of the samples, the laminated resin sheet was immediately peeled off after lamination, and for some of the samples, the laminated resin sheet was peeled off after aging at 50 ° C. for 2 hours, as shown in the cross-sectional view of FIG. Such a hologram label was obtained, and this was designated as Sample 1. (B) Wet laminating conditions (a) Device: device of FIG. 6 (b) Adhesive coating method: Roll coating method (c) Adhesive coating amount: 2 g / m ² (d) Drying Temperature: 70 to 110 ° C. (e) Processing speed: 150 m / min As a comparative example, the same procedure as in the above example was performed using the above-mentioned base sheet on which the coating agent layer for peeling the resin layer is uncoated. A hologram label was produced under the conditions of the apparatus, resin, and processing conditions, and this was used as comparative sample 1.

The hologram forming surface of the laminated resin sheet obtained in the preparation of Sample 1 was corona-discharge treated, and then aluminum was vapor-deposited to a thickness of about 1000 angstroms. The same coated paper was dry laminated with a urethane adhesive to obtain a hologram label, which was used as Comparative Sample 2.

Table 1 shows the trial production results of Sample 1 and Comparative Sample 1.
Shown in.

As can be seen from Table 1, Sample 1 according to the example of the present invention had excellent performance in peelability. On the other hand, Comparative Sample 1 not coated with the coating agent for peeling the laminated resin sheet requires aging for good transfer of the aluminum vapor deposition layer and has a higher productivity than Sample 1 of the present invention. bad.

[0055]

[Table 1] The transfer state of the Al vapor deposition layer was visually evaluated and evaluated as ⊚: excellent, ◯: good, Δ: acceptable, and x: not acceptable.

Table 2 below shows the evaluation results of hologram formability, water resistance, and bottle washability of Sample 1, Comparative Sample 1, and Comparative Sample 2.

As can be seen from Table 2, Sample 1 according to the examples of the present invention had excellent performances in all of hologram formability, water resistance, and bottle washability. On the other hand, Comparative Sample 2 is inferior in washing ability, and Comparative Sample 1 is inferior in productivity as described above, although there is no particular problem in the performance of the obtained label.

[0058]

[Table 2] (* 1) Hologram formability: The brightness of the hologram was visually evaluated, and ◯: good (bright), Δ: the hologram is visible but dark, and x: dark. (* 2) Water resistance: The label obtained was immersed in water at 25 ° C for 1 hour and the surface condition was visually evaluated. ○: Good (no change), △: Fair (slightly cracked), ×: Poor (large) Crack). (* 3) Bottle washability: The obtained label was attached to a glass plate with starch paste, immersed in 4% NaOH aqueous solution at 70 ° C, and the time required for the label to peel off was measured. ◎: Excellent (3 minutes or less), ◯: good (5 minutes or less), Δ: acceptable (10 minutes or less), x: defective (10 minutes or more).

[0059]

As described in detail above, according to the present invention, by molding a hologram using a resin melt-extruder, it is possible to remove the laminated resin on the thermoplastic resin laminated surface of the base sheet. A container having a hologram having good moldability can be obtained efficiently, simply, and inexpensively by providing the coating agent layer, and a container having such a hologram needs to be collected and reused. When it is used for the label, it has an excellent effect that it is possible to produce a hologram label which can be easily peeled and removed with an alkaline solution.

Further, various labels are manufactured according to the application by selecting and using a peeling coating agent, a base sheet, a thermoplastic resin, a paper base material, and an alkali-soluble adhesive resin. be able to.

[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 laminated sheet in which a metal reflection layer and an adhesive resin layer 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 the laminated resin sheet is peeled off after the laminated sheet is laminated with the paper base material.

FIG. 5 is a cross-sectional view of a structure in which a hologram label is provided with a primer layer, a printing ink layer and an overcoat layer.

FIG. 6 is an explanatory diagram showing an outline of a wet laminating apparatus.

[Explanation of symbols]

1 Melt extrusion molding machine 2 T-die 3 cooling rolls 4,54 nip roll 5 Relief type hologram stamper 6 pick-up roll 7 winding roll 11 Molten extruded thermoplastic resin (sheet) 12 Metal reflective layer 13 Adhesive resin layer 14 Hologram forming sheet 15 Base paper 16 Clay coat layer 17 Paper base material 20 hologram label 21 Primer layer 22 Printing ink layer 23 Overcoat layer 24 Coating layer for peeling laminated resin layer 30 Base sheet 40 laminated resin sheet 51 laminated resin sheet 53 Adhesive coating department 54 nip roll 55 Drying oven 56 winding roll

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-1-192895 (JP, A) JP-A-7-121109 (JP, A) JP-A-8-185122 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) G09F 3/00-3/03 B31D 1/02 G03H 1/18

Claims (10)

(57) [Claims] 1. An alkali-soluble adhesive resin on a paper base material.
Layer and a metal reflective layer forming a relief hologram
In the method for producing a hologram label having, a thermoplastic resin extruded in a sheet form from a T-die of a melt extrusion molding machine is provided on the surface of the coating agent layer of a base material sheet on which a coating agent layer for peeling a laminated resin sheet is provided in advance. By stacking and pressing the relief type hologram stamper with a cooling roll mounted on the surface to cool,
Forming a laminated resin sheet obtained by forming a relief hologram on a surface of the thermoplastic resin, then the relief hologram formation surface of the laminated resin sheet, the metal reflective layer is provided, further adhesive resin layer of the alkali-soluble through to create a hologram forming sheet was laminated with the paper quality substrate, after accordingly, and then exfoliating the metal reflective layer of the hologram forming sheet before <br/> SL interface of the laminated resin sheet Method for manufacturing bottle-washable hologram label. 2. A low-melting-point wax, a plasticizer, and a low- and medium-molecular-weight activator as a coating agent layer for peeling the laminated resin sheet
2. The method for producing a bottle-washable hologram label according to claim 1, wherein two or more kinds are used. 3. The method for producing a bottle-washable hologram label according to claim 1, wherein biaxially oriented polypropylene or biaxially oriented polyester is used as the base sheet. 4. The method for producing a bottle-washable hologram label according to claim 1, wherein a polyolefin resin is used as the thermoplastic resin. 5. The bottle washing hologram according to claim 1, wherein a primer layer, a printing ink layer and an overcoat layer are provided in this order on the metal reflection layer. Label manufacturing method. 6. The washing bottle according to claim 1, wherein the paper base material is coated paper having an elongation in water of 2.5% or less when immersed in water. Of producing a transparent hologram label. 7. The alkali-soluble adhesive resin,
The method for producing a bottle-washable hologram label according to any one of claims 1 to 6, wherein an acrylic / vinyl acetate copolymer resin is used. 8. The alkali-soluble adhesive resin,
The method for producing a bottle-washable hologram label according to any one of claims 1 to 6, wherein a chlorinated polypropylene resin is used. 9. The alkali-soluble adhesive resin,
2. A polyurethane-based resin is used.
7. The method for producing a bottle-washable hologram label according to any one of items 6 to 6. 10. The method for producing a bottle-washable hologram label according to claim 9, wherein a resin obtained by reacting a polyester polyol resin component and a polyisocyanate resin component is used as the polyurethane resin.