JP3747426B2 - Can with hologram - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a can body with a hologram in which a hologram is applied to the can body, and in particular, with a hologram such that a resin film on which a printed layer is formed and a relief hologram is formed is attached to the can body. It relates to the can body.
[0002]
[Prior art]
Holograms that illuminate in rainbow colors and have subtle changes in color depending on the viewing angle have been used in various fields in the past to enhance decorativeness. Relief-type holograms (embossed holograms) formed with irregularities have been used in general, and metal cans that can be used as canning containers also have character and pattern printing parts. In order to further enhance the decorativeness, it has been conventionally proposed to apply such a relief hologram to the body of the can body.
[0003]
That is, in order to apply a hologram to the can body, for example, the surface of a tool in which interference fringes corresponding to the wavefront of light from a document to be expressed as an image are formed as relief holograms in an uneven shape is processed. Japanese Patent Publication No. 5-7265 proposes a method in which a relief hologram is directly formed on a metal surface by engaging and transferring the metal surface.
[0004]
Also, after printing on the can body, applying a transparent thermosetting resin on it and heating it to cure it completely, print the thermosetting resin only on the desired part, and further heat it. A method in which the hologram foil is pressure-bonded to the upper surface of the thermosetting resin immediately before the printed resin is completely cured, and the hologram foil is stamped and then heated to be completely cured is disclosed in JP-A-6-210934. Proposed by the publication.
[0005]
[Problems to be solved by the invention]
By the way, with respect to the application of the relief hologram to the conventional metal can as described above, in the method disclosed in Japanese Patent Publication No. 5-7265, the hologram is formed on the flat metal surface. When a can body is formed by rounding into a cylindrical shape, an excessive load is applied to the metal surface on which the hologram is formed, which may adversely affect the hologram, while the can body is formed in a cylindrical shape. When a hologram is formed on a later curved metal surface, the operation of engaging the cylindrical surface with the tool must be performed very delicately and accurately, and the work efficiency is greatly reduced.
[0006]
In addition, when printing after forming the hologram, in order to prevent the printing ink from obstructing the hologram effect, it is necessary to perform accurate alignment so that the printing ink does not adhere to the hologram portion, It is necessary to reduce the printing speed so as to prevent scattering, and conversely, even when a hologram is formed after printing, accurate alignment is still necessary to form a hologram on an unprinted metal surface. In any case, the work is troublesome, the work efficiency is lowered, and it is difficult to increase the production speed.
[0007]
Moreover, the metal surface on which the hologram is formed rusts as it is, so it is necessary to cover it with a transparent coating film. If the hologram is formed after printing, the hologram is further protected in addition to the coating and drying steps for protecting the printed layer. Because the painting process and the drying process for are added, it becomes quite expensive.
[0008]
On the other hand, even the method disclosed in Japanese Patent Application Laid-Open No. 6-210943 requires alignment when printing a thermosetting resin only on a desired portion, and there are many processing steps for a can body. Therefore, there is a problem that productivity is difficult to increase and costs are increased.
[0009]
In order to solve the above problems, a relief hologram is directly formed on the surface of the transparent thermoplastic resin film (the surface opposite to the can body side) to be attached to the can body. Alternatively, after forming a relief hologram on the surface of the lubricant-containing thermosetting resin layer provided on the upper surface of the transparent thermoplastic resin film, the back surface of the transparent thermoplastic resin film ( After printing on the surface of the can body), the method of adhering the film to the can body through an adhesive layer provided so as to cover the printed layer is the application of the present applicant prior to this application ( Japanese Patent Application No. 9-152896).
[0010]
According to the can body with a hologram using such a film for sticking a can body, as compared with the can body with a hologram by a conventional method, the manufacturing efficiency is not significantly increased and the work efficiency is greatly reduced. However, the relief hologram can be satisfactorily formed on the surface of the can body, but as a result of further detailed examination of the can body with a hologram using such a can body sticking film, as described below. It turns out that there is a problem.
[0011]
That is, in a conventional printed film pasted can body, a lubricant such as silicon or wax is applied to the surface of the film to be pasted as a protective layer (topcoat layer) for preventing the surface of the can body from being damaged. It is common to apply a transparent thermosetting resin containing about 0.1 to 4.0% by weight, otherwise the outer surface of the can will be damaged during the subsequent can manufacturing process or the can manufacturing process. Or when the cylindrical can body is slippery, the timing of the processing is delayed, and when the mouthpiece is squeezed from the cylindrical can body (neck-in processing) As the frictional force increases, the molding force increases and the can body buckles.
[0012]
In this regard, in the case of a film-attached can with a hologram as described above, when a relief-type hologram is directly formed on a thermoplastic resin film, slipperiness is caused by extremely fine irregularities being formed in a wide range. However, since a top coat layer containing a lubricant is not provided on the surface of the film to be adhered, there is a possibility that scratches and dirt are generated on the outer surface of the can body.
[0013]
Therefore, when a top coat layer of a transparent thermosetting resin is applied on the hologram forming surface in order to prevent the outer surface of the can from being scratched or soiled, it was formed as extremely fine irregularities. Since the hologram forming surface is filled with a transparent thermosetting resin having a light refractive index close to that of the hologram forming resin, the effect of the hologram due to the light refraction phenomenon is lost.
[0014]
It should be noted that, for a portion requiring the hologram effect, a reflective layer by metal vapor deposition is further provided on the hologram forming surface, and then the whole is covered with a transparent topcoat layer (overcoat layer). Although disclosed in Japanese Laid-Open Patent Application No. 8-179679, in such a case, it is necessary to further provide a thin film layer of metal vapor deposition on the hologram forming surface. Such a process is troublesome and the film itself is expensive. In addition, it is not possible to expect a deep decorative effect due to the overlap of the hologram with the printed layer provided in the lower layer of the hologram forming layer.
[0015]
On the other hand, in the film-attached can body with a hologram as described above, when a top coat layer of a transparent thermosetting resin is provided on the thermoplastic resin film and a hologram is formed on the surface, the film is completely cured. By forming relief-type holograms on the surface of a thermosetting resin containing a lubricant, the processing conditions become considerably strict, resulting in a decrease in production efficiency and a decrease in product yield. Since the load increases, the durability of the hologram plate used as the original plate is significantly reduced.
[0016]
Furthermore, apart from such problems, from the viewpoint of product diversification, in order to make use of various hologram patterns as designs, various embossed plates can be changed to form various relief holograms, or hologram forming resin layers Conventionally, it has been generally performed to emboss a hologram on the resin layer by printing in various patterns.
[0017]
However, if it is intended to diversify the hologram pattern in the film-attached can body with hologram by such a conventional method, a large number of films having different hologram patterns are prepared and attached to the can-making line. The film has to be replaced each time, which not only increases the time for changing the mold, but also has a large inventory of various types of sticking films with different hologram patterns.
[0018]
The present invention has an object to solve the above-described problems. Specifically, by forming a relief hologram on the surface of a can sticking film, the manufacturing process can be greatly increased or the work efficiency can be improved. In the can body in which the hologram is well formed on the surface of the can body of the metal can body, and the hologram is formed on the surface of the film for sticking the can body, the sliding performance of the can body can be improved. While preventing the occurrence of stains and scratches on the surface of the can body in the can making process and can manufacturing process, and without losing the deep decorative effect due to the overlap between the hologram and the printed layer, It is an object to economically diversify the hologram pattern applied to the can.
[0019]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention applies a printed resin film having a printed layer on one surface of a transparent thermoplastic resin film as a main layer so as to cover the printed layer. In the film-bonded can body, which is bonded to the outer peripheral surface of the can body metal plate through the adhesive layer formed, the surface of the resin film opposite to the can body metal plate side is extremely fine. Relief type hologram with unevenness In addition, the hologram formation surface is partially covered with a top coat layer of a transparent curable resin containing a lubricant, so that a portion that is not covered with the top coat layer and remains as a hologram is a thin line. Or a combination of fine lines, and the thickness of the fine lines is 0.2 to 0.5 mm, and the interval between the fine lines is 1.0 to 2.0 mm, or regular. The pattern is a repetitive pattern, and the maximum size of one figure or point is 1.0 to 3.0 mm, and the pitch of each figure or point is 1.5 to 4.0 mm. It is characterized by this.
[0020]
According to the configuration as described above, a printed resin film on which a relief hologram has been formed in advance is adhered to a can body metal plate (or adhered to a metal surface of a cylindrical can body, or a flat plate shape) It can be applied to the surface of the can body with a hologram decoration effect with a deep hologram and printed pattern, and it can be partly provided. The top coat layer can secure the sliding performance of the can body and prevent the surface of the can body from being stained or scratched in the can manufacturing process or the can manufacturing process.
[0021]
Also, since the pattern of the part left as a hologram can be changed simply by changing the application pattern when applying the top coat to the hologram forming surface with a coating roller (such as a gravure coater), diversification of the hologram pattern is easy. Can be achieved.
[0022]
In that case, the part not covered with the top coat layer , The thickness of the thin line is 0.2 to 0.5 mm, and the interval between the thin lines is 1.0 to 2.0 mm, or the thin lines are repeated or combined, or one figure (or point) A repeating pattern of figures (or points) having a maximum dimension of 1.0 to 3.0 mm and a pitch between the figures (or points) of 1.5 to 4.0 mm; is doing Thereby, the visibility of the printed character and printed pattern which are lower layers than a hologram formation surface can be made favorable.
[0023]
That is, according to the study by the present inventors, in the portion where the hologram forming surface and the printed layer overlap, if the printed characters and printed patterns in the lower layer are small, it can be seen by the rainbow-colored reflected light of the hologram depending on the viewing angle. It turned out to be difficult. In particular, although it is difficult to read small printed characters used for explanation of contents and cautionary notes, it is desirable that such explanations and cautionary notes be sufficiently readable without being disturbed by the hologram. In this regard, by dispersing the portion left as a hologram as described above, the decorative effect of the hologram is utilized, and even with small printed characters and printed designs, it is not disturbed by the rainbow color of the hologram. Now it can be read.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a can body with a hologram of the present invention will be described in detail with reference to the drawings.
[0025]
FIG. 1 (A) partially shows a cross section of a can body, and FIG. 1 (B) shows a further enlarged cross section of such a can body with respect to an embodiment of a can body with a hologram of the present invention. FIG. 2 is a cross-sectional view of the can body section shown in FIG. 1 (B) as viewed obliquely from above, and the can body 1 has a cylindrical shape forming the main body portion of the can body. It is a printing film sticking can body which did not print directly on the metal plate 2, but stuck together the resin film 3 for can body sticking which printed beforehand by heat bonding.
[0026]
The printed resin film 3 adhered to the metal plate 2 of the can body is on the back side (the side to be bonded to the metal plate 2) with respect to the transparent thermoplastic resin film 4 serving as the main layer. In addition, a printing layer 5 made of a plurality of printing inks is provided, and an adhesive layer 6 made of an adhesive is provided so as to cover the printing layer 5 entirely, and the surface side thereof (the side opposite to the metal plate 2) In addition, a transparent hologram forming layer 7 having a relief hologram 3a formed by unevenness with extremely fine intervals is provided on the surface, and the hologram forming surface 3a of the hologram forming layer 7 is partially covered so as to be slippery. A transparent top coat layer 8 containing an agent is provided.
[0027]
In this embodiment, the transparent top coat layer 8 containing the lubricant is formed on the surface of the hologram forming layer 7 in a regular lattice pattern as seen in a plan view as shown in FIG. The formed relief hologram forming surface 3a is partially covered with a coverage of 50% or more.
[0028]
In the can with a hologram of the present embodiment as described above, the relief hologram 3a formed on the surface of the transparent hologram forming layer 7 superimposed on the upper side of the transparent thermoplastic resin film 4 is used as the transparent top coat layer. Since the portion 8 is partially covered, the portion covered with the topcoat layer 8 is filled with the resin of the topcoat layer 8 whose curvature is very close to that of the hologram forming layer. The effect disappears, and only the printed pattern by the printed layer 5 superimposed on the lower side of the transparent thermoplastic resin film 4 can be clearly seen.
[0029]
On the other hand, the relief hologram 3a formed on the surface of the hologram forming layer 7 is printed on the surface of the hologram forming layer 7 through the transparent thermoplastic resin film 4 and the printed pattern of the lower printing layer 5 is not covered with the top coat layer 8. Because it is in an overlapping state, when receiving light on the surface of the can body, depending on the position of the viewer, the rainbow color by the hologram or the printed pattern can be seen, giving a strong impression to the viewer The hologram effect that can be given is exhibited.
[0030]
In particular, the printing layer 5 (usually having a thickness of 5 μm or less) is on the back side of a transparent thermoplastic resin film 4 (for example, 10 μm or more) that is considerably thicker than the printing layer 5, and the hologram forming surface 3 a Since the hologram forming layer 7 on the surface is on the surface side of the transparent thermoplastic resin film 4, it becomes a three-dimensional decorative layer with a deep depth, thereby giving a higher quality feeling. Even if it is reduced, the sense of quality will not be lost.
[0031]
In this regard, multi-color offset printing on conventional steel plates for three-piece cans and multi-color gravure printing on resin films for sticking cans can be overprinted, so the number of ink colors is only the three primary colors or the ink color is added to it. Although most of the printing should be possible with four colors, in order to bring out the luxury and luxury of decorative printing, printing using more than six to eight colors has been performed, Even in a two-piece can that directly performs multicolor printing on a can body by a dry offset printing method, printing using ink of 7 colors or 8 colors is increasing recently.
[0032]
On the other hand, in the can body with hologram of this embodiment, in addition to the decorative effect by the printed layer 5 formed on the back surface of the transparent thermoplastic resin film 4, the hologram that shines in rainbow color depending on the viewing angle is transparent. By forming on the surface side of the thermoplastic resin film 4 (in this embodiment, the surface of the hologram forming layer 7), even if printing is performed using four or less colors, the printing effect depends on the hologram. Addition of the decoration effect increases the appeal and appeal to consumers due to the luxury and luxury.
[0033]
The fact that the number of colors of the printing layer 5 can be reduced in this way means that the number of inks used for printing may be small, and as a result, the time required for the printing type change is shortened. (Because the number of plates is the same as the number of inks) Also, since the time required to register the printing pattern of each color plate before printing is shortened, the preparation time for printing can be greatly shortened (printing work) Efficiency).
[0034]
According to the experiments by the present inventors, the color of the printing ink on the back side of the portion where the hologram effect appears has a relatively low brightness such as dark red, dark brown, dark green, and black (black). In addition, even when printing is performed on the back side of the transparent thermoplastic resin film 4 with four or less colors, when the color printing is relatively low in color, it is formed on the upper side. It has been found that the decorative effect of the hologram is higher.
[0035]
By the way, specific examples (but not limited to) of materials used for each part of the can 1 with a hologram of the present embodiment as described above are as follows.
[0036]
For the metal plate 2 forming the can body of the can 1, cold rolled plate, hot dip zinc and zinc alloy plated steel plate, electrogalvanized and zinc alloy plated steel plate, tinplate, ultrathin tin plated steel plate, tin-free steel, chrome plated steel plate , Aluminized steel plate, nickel-plated steel plate, other various alloy-plated steel plates, aluminum alloy plates, other metal plates, and chemical conversion treatment such as phosphate treatment, chromate treatment, organic chromate treatment as necessary Cobalt composite oxide film treatment, nickel displacement plating, and other treatments can be used.
[0037]
The transparent thermoplastic resin film 4 that is the main layer of the resin film 3 has a relatively high transparency and excellent heat resistance, such as a polyester film, nylon film, and polypropylene film having a thickness of 10 to 30 μm. A film can be used, for example, as a polyester film, what used ethylene terephthalate and ethylene isophthalate as the main structural components is used.
[0038]
When a polyester film is used as the thermoplastic resin film 4, other components may be copolymerized as long as the characteristics of the present invention are not impaired. For example, as the dicarboxylic acid component to be copolymerized, naphthalenedicarboxylic acid, diphenyldicarboxylic acid Aromatic dicarboxylic acids such as acid, diphenylsulfone dicarboxylic acid, diphenoxyethane dicarboxylic acid, 5-sodium sulfoisophthalic acid, phthalic acid, oxalic acid, succinic acid, adipic acid, sebacic acid, dimer acid, maleic acid, fumaric acid, etc. Alicyclic dicarboxylic acid such as cycloaliphatic dicarboxylic acid, oxycarboxylic acid such as p-oxybenzoic acid, and the like.
[0039]
Examples of the glycol component to be copolymerized include aliphatic glycols such as propanediol, butanediol, pentanediol and neopentylglycol, alicyclic glycols such as cyclohexanedimethanol, aromatic glycols such as bisphenol A and bisphenol S, and diethylene glycol. And polyoxyethylene glycol such as polyethylene glycol.
In addition, about said dicarboxylic acid component and glycol component, you may use 2 or more types together.
[0040]
When a nylon film is used as the thermoplastic resin film 4, a polycondensation product of a diamine and dicarboxylic acid such as nylon 66, nylon 610, or nylon 612, or a lactam such as nylon 6, nylon 11, or nylon 12 is used. Any of the ring-opening polymers can be used.
[0041]
For the printing layer 5 applied to the back surface of the thermoplastic resin film 4, an ink made of a thermosetting urethane-based resin or the like is used, and the printing method includes gravure printing, flexographic printing, offset printing, and the like. Various printing methods can be selected as appropriate. However, in the case where it is desired to print beautiful characters and patterns with rich colors using a large number of colors, the printing layer 5 is preferably formed by gravure printing.
[0042]
For the adhesive layer 6 applied so as to cover the entire surface of the printing layer 5 from the back side, it is easy to adhere by heating and pressurization, and the thermosetting type has good adhesion to the ink used for the printing layer 5. As such an adhesive, there is a thermosetting resin mainly composed of polyester, and an EB curable (electro-curable) resin is used in combination as another curable resin component. be able to.
[0043]
For the adhesive layer 6, urethane-based, epoxy-based, and isocyanate-based thermosetting adhesives can also be used. In order to enhance the printing effect, the resin constituting the adhesive layer 6 is colored white. An agent may be mixed.
[0044]
The polyester resin used for the adhesive is a conventionally known polybasic acid and polyhydric alcohol condensate, which is a thermoplastic resin, and has a number average molecular weight of 7,000 to 40,000, preferably 10,000 to 30, The polyester resin is produced by subjecting the following acid component and alcohol component to condensation polymerization in a reaction vessel at a temperature of 200 ° C. to 250 ° C.
[0045]
Polybasic acids used in the production of polyester resins include aliphatic dibasic acids such as adipic acid, suberic acid, azelaic acid, sebacic acid, decane-1,10-dicarboxylic acid, hexahydrophthalic acid, hexahydro Alicyclic polybasic acids such as trimellitic acid and tetrahydrophthalic acid, and anhydrides thereof, aromatic polybasic acids such as phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, and pyromellitic acid, and anhydrides thereof, In addition, maleic acid, fumaric acid, itaconic acid and the like can be mentioned.
[0046]
Polyhydric alcohols used in the production of polyester resins include ethylene glycol, propylene glycol, diethylene glycol, 1 · 2-butylene glycol, 1 · 6-hexanediol, 1 · 4-cyclohexanedimethanol, neopentyl glycol, poly A lactone diol etc. can be mentioned.
[0047]
Moreover, as a thermosetting component used for the adhesive, amino resins such as melamine resin, guanamine resin, urea resin, and phenol resin can be used, and as for isocyanate curing, tolylene diisocyanate (abbreviation TDI), Aromatic isocyanates such as 4.4'diphenylmethane diisocyanate (MDI) or aliphatic isocyanates such as hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), xylene diisocyanate (XDI) can be used.
[0048]
The EB curable (electro-curable) resin used for the adhesive is a polyester oligomer having a number average molecular weight of 300 to 5,000, preferably 1,000 to 2,000. Those having a polymerizable unsaturated double bond of ˜5.0 mol / kg molecule, preferably 1.0 to 3.0 mol / kg molecule.
[0049]
Examples of the polyester oligomer include those obtained by ester-linking (meth) acrylic acid to a hydroxyl group-containing low molecular weight polyester having a number average molecular weight of 5,000 or less. For the low molecular weight polyester, the polyester resin component described above is used. It is obtained by combining a polybasic acid and a polyhydric alcohol.
[0050]
Examples of the stress relaxation agent blended in the thermosetting adhesive mainly composed of polyester (when EB curing may be used in combination) include silica, bentonite, clay, talc, barium sulfate, calcium carbonate, etc. When coloring (for example, white) is required, titanium oxide can be contained.
[0051]
The transparent hologram forming layer 7 provided on the surface side of the transparent thermoplastic resin film 4 is not completely cured at the time of embossing for forming the relief hologram 3a, and can be pressure-molded or thermoformed. In the processing after the hologram formation, it is necessary to be completely cured and to have a resistance enough to withstand the pressure or heat pressure during processing and the solvent in the adhesive.
[0052]
As such a resin, a reactive curable resin such as an ultraviolet curable resin, an electron beam curable resin, a thermosetting resin, and a natural curable resin can be used. A resin that cures with a wire is suitable. Specifically, for example, materials for a hologram forming layer are disclosed in Japanese Utility Model Publication No. 5-47108, Japanese Patent Application Laid-Open No. 60-254174, Japanese Patent Application Laid-Open No. 63-108374, and the like. A well-known curable resin such as that disclosed in Japanese Patent Application Laid-Open No. H07-228867 can be used, and by using such a transparent curable resin as the hologram forming layer 7, the embossed hologram can be easily processed and the production efficiency is increased. At the same time, the durability of the hologram plate is improved.
[0053]
With respect to the top coat layer 8 partially provided on the surface of the transparent hologram forming layer 7 (in the present embodiment, in a lattice pattern), a slipping agent is used in order to give the can body surface of the can body slipperiness. As a transparent curable resin containing, for example, a lubricant such as silicon or wax is added to a thermosetting resin such as epoxy-amino resin, epoxy-melamine resin, or polyester-amino resin. What is blended in an amount of 1 to 4.0% by weight is used. In addition, what mix | blended the lubricant with the ultraviolet curable resin or the electron beam curable resin can also be used.
[0054]
As the main resin of the top coat layer 8, a polyester resin, an acrylic resin, an epoxy resin, or the like can be used. As a curing agent, an amino resin such as a melamine resin, a phenol resin, or the like can be used. As the lubricant, lanolin, carnauba, paraffin, polyethylene, PTFE (tetrafluoroethylene resin), silicon such as polyether-modified dimethylsilane, silica, and the like are effective.
[0055]
By the way, FIG.3 and FIG.4 manufactures the resin-made film 3 of the sticking can body by which the hologram which was printed and stuck on the metal plate 2 of the can body of the can body 1 with a hologram of this embodiment was formed. In this example, a long film of a thermoplastic resin film with a single-sided hologram prepared separately as a pre-coiled product is used as a raw material. While the film is running, the printed layer 5 and the adhesive layer 6 are sequentially provided on the surface opposite to the hologram forming surface 3a of the film, so that it is printed before being attached to the metal plate 2 serving as the can body. A long film of resin film 3 on which a hologram is formed is manufactured.
[0056]
The production of the thermoplastic resin film with a single-sided hologram as a raw material is not shown, but the embossed hologram mold is laser-coated on a dry plate coated with photoresist by a conventional method. After exposing the interference fringes to make an uneven resist corresponding to the intensity of the interference, then depositing a metal on this, forming a film to give conductivity, plating nickel on it, By removing the plating layer from the original plate, an embossed hologram mold in which an extremely fine uneven shape is accurately copied is manufactured.
[0057]
Even if such an embossed hologram mold manufactured by a known method is repeatedly hot-pressed directly on the surface of a long film made of thermoplastic resin, a hologram with unevenness of extremely fine intervals is formed on the surface of the film. A long film that is repeatedly reproduced can be obtained, but the processing by the stamp method using such an embossed hologram mold itself does not increase the processing speed.
[0058]
For this reason, the embossed hologram mold can be processed by embossing on the rotating outer peripheral surface of a metal jacket roll that can be heated by means such as induction heating or flowing a heated fluid inside. The relief hologram on the outer peripheral surface of the roll is continuously pressed against the surface of a long film made of thermoplastic resin having a thickness of 12 μm continuously running with a metal jacket roll of An embossed hologram process for repeatedly forming a relief hologram on the surface of a long film is performed at high speed. (Of course, depending on the degree of curing of the resin constituting the hologram forming surface, the emboss hologram processing can be performed at high speed without heating the metal jacket roll for emboss hologram processing.)
[0059]
In this embodiment, a transparent hologram forming layer 7 is provided on one surface of a transparent thermoplastic resin film 4 made of polyethylene terephthalate, and a relief hologram 3a is formed on the surface of the hologram forming layer 7. Therefore, when producing a thermoplastic resin film with a single-sided hologram as the raw material, first, for example, a transparent curable resin that is cured by ultraviolet irradiation is applied to one side of a long film made of thermoplastic resin. And forming a hologram forming layer by drying (or drying and ultraviolet irradiation), and then pressing an embossed hologram mold against the hologram forming layer while forming a relief hologram on the surface of the hologram forming layer or After the formation, the hologram forming layer is completely cured by irradiation with ultraviolet rays.
[0060]
That is, for a long film made of a thermoplastic resin that is unwound from a coiled state and fed out by a feeding roll, for example, a gravure roll (a roll having a very small concave portion formed on the surface) is used for transparent ultraviolet curing. First, a hologram forming layer is formed on one side of the long film by continuously applying a conductive resin and then heat-drying (or heat-drying and ultraviolet irradiation), and then the long length of traveling By pressing the relief hologram formed on the outer peripheral surface of the metal jacket roll against the film against the surface of the hologram forming layer at room temperature or while heating, the relief hologram is repeatedly formed on the surface of the hologram forming layer. Then, the hologram forming layer is completely cured by irradiating with ultraviolet rays after or during the formation. (In the case of an electron beam curable resin, an electron beam is irradiated, and in the case of a thermosetting resin, it is heated to completely cure the hologram forming layer.)
[0061]
The pitch of the unevenness of the relief hologram formed on the film surface by such embossed hologram processing is in the range of 0.1 μm to 2 μm. Desirably, the range is 3 μm to 1 μm. Further, it can be arbitrarily selected whether such embossed hologram processing is applied to the entire surface of the long film or partially repeated on the surface of the film.
[0062]
As shown in FIG. 3 and FIG. 4, the long film is unwound from the coiled state and drawn out with respect to the long film with a single-sided hologram having the thermoplastic resin film 4 produced as the main layer as the main layer. First, a transparent thermosetting resin containing 1.0% by weight of a lubricant is applied to the surface (the surface on which the hologram has been formed) by a top coat application roller while being continuously run by a roll. (It is a regular lattice pattern in this embodiment) It is applied continuously and partially, cured by heating and drying, and provided on the surface of the long film (the surface of the hologram forming layer 7). The hologram forming surface 3a thus obtained is partially covered with a top coat layer 8 of a transparent thermosetting resin containing a lubricant.
[0063]
Next, on the back surface of such a long film, a printing layer by multicolor printing is performed by sequentially repeating back printing with 3 to 8 printing inks using a printing means such as gravure and flexo on a printing roller. 5, and further, the adhesive layer 6 is continuously formed by applying an adhesive with an adhesive application roller so as to cover the entire surface of the printed layer 5 from above, and then the printed layer is formed. 5 and the adhesive layer 6 are heat-dried, and then coiled as a long film that has been printed and hologram-formed with a winding roll.
[0064]
For the printed and hologram-formed long film manufactured as described above, the printing of the printing layer 5 was performed by one or more prints having a non-printing portion with a narrow width on both sides in the longitudinal direction of the printing portion. The continuous printing of the printed pattern corresponding to the label indicating the canned contents, etc. (printing the same pattern is repeated at the same length as the height of one can body) is the width of the long film. In the direction, the printed portion is provided so as to form a plurality of strips (printing of a plurality of cans) across the non-printed portion.
[0065]
For continuous printing of a repeating pattern as described above on a long film, it is not always necessary to have multiple stripes, but if you print to multiple stripes, compared to printing one by one Since the printing efficiency is high and the production efficiency is high when the printed film is stuck on a metal plate, the can manufacturing cost can be kept low.
[0066]
In addition, when the printed part is applied so that there are a plurality of strips across the non-printed part, the plurality of parts after the non-printed part is cut and removed immediately before being attached to the strip-like ultrathin tin-plated steel sheet. The printed portion of the strip is attached to the strip-shaped ultrathin tin-plated steel plate with a narrow interval.
[0067]
The method of applying the adhesive to the long film is not particularly limited. However, when performing gravure printing, the gravure method is desirable because printing can be performed by a series of operations.
[0068]
In order to produce a three-piece can film sticking can body having a side seam portion such as a welded can body using a printed and hologram-formed long film obtained as described above, conventionally, A method similar to the pasting method of a printed resin film (see Japanese Patent Laid-Open Nos. 4-91949 and 5-147181) is applied.
[0069]
That is, a long (strip-shaped) ultra-thin tin-plated steel plate (which may be tin or nickel-plated steel plate) having a width slightly longer than the circumferential length of a plurality of coiled can bodies, and a coiled printed product A pair of pressurizers that run while unwinding each of the long hologram-formed films in step 1, heat the long ultra-thin tin-plated steel sheet in the middle of the run, and superimpose the two to apply them together After cutting and removing the non-printed portion of the long film at a position immediately before the roll, the plated steel plate and the film are overlapped so that the adhesive layer is in contact with the plated steel plate, and a pair of pressure rolls By pressurizing both, a belt-like ultrathin tin-plated steel sheet with a film attached for a three-piece can body material can be obtained at high speed and continuously.
[0070]
As conditions for bonding, the speed is 0 to 300 m / min, the temperature is 140 to 200 ° C., and the pressure by the pressure roll is increased to 250 to 750 N / cm as the linear pressure. Is effective to increase the productivity to 200 m / min or more, and the bonding temperature protects the embossed hologram surface, although it depends on the heat fusion temperature and melt viscosity of the adhesive. From the viewpoint of making it, it is preferable to set the pressure to 150 to 170 ° C., and the pressure is more effective for the adhesiveness. However, in consideration of the dimensional stability, printing is performed in advance. In the case of bonding a certain film, control becomes difficult, so about 500 N / cm is preferable.
[0071]
For the strip-shaped three-piece canned plated steel plate on which the printed and hologram-formed resin film is adhered as described above, the surface opposite to the adhesion surface of the film is plated in advance. A plurality of strips extending in the longitudinal direction of the steel sheet are applied as an inner coat (inner surface coating film), or a thermoplastic which becomes an inner coat at the same time as or before and after the bonding process between the film and the plated steel sheet. A plurality of synthetic resin films are attached.
[0072]
The strip-shaped ultrathin tin-plated steel sheet for a 3-piece can body manufactured in such a manner is first cut into a blank of the size of a can body, and then to each can body forming machine. After being hung and formed into a cylindrical shape, the overlapped part is seam welded by a welding machine to become a can body, and then neck-in processing and flange processing are applied to both ends of the can body by a neck-in processing machine and a flanging device. After that, the can body is sent to a can lid winding device, and a bottom lid is wound around one end of the can body to form a three-piece can body having a printing can body with a hologram.
[0073]
For printed and hologram-formed long films, not only the above three-piece cans but also metal discs such as aluminum alloy plates and surface-treated steel plates are used as materials, and there are no side seams. Even for two-piece cans that are formed by integrally forming a cylindrical can body and can bottom, the side seam part can be formed by impact processing or drawing redrawing (including those that are stretched during redrawing). It can also be used for a two-piece can in which a cylindrical can body and a can bottom are integrally formed.
[0074]
In order to manufacture a two-piece can film-attached can body having no side seam portion using a printed and hologram-formed long film, Japanese Patent Application Laid-Open No. 9-295539, Japanese Patent Application Laid-Open No. 4-57747, etc. A method similar to the method disclosed by is applied.
[0075]
That is, it is run while unwinding a coiled and printed hologram-formed long film, and its horizontal width (the length in the horizontal direction when viewed from the vertical and horizontal directions of printed characters and decorative patterns) is a can body By continuously cutting as a film sheet for each can so as to be slightly longer than the waist circumference, a large number of film sheets to be attached to the can body can be continuously applied to the film application apparatus. Provide for.
[0076]
In addition, the film sheet to be attached to a two-piece can without a side seam portion may be in a state where both ends are abutted when wound around the can body, but when both ends are wrapped around the can body, Overlapping can protects the can body (even if there is some cutting error in the film sheet, the entire circumference of the can body is completely covered with the film sheet when stuck. ) Is preferable.
[0077]
Further, when both ends of the film body are overlapped when wound on the can body, the printed layer of the film sheet is also continuously printed in the longitudinal direction and the width direction (there is no non-printed portion. The same applies to the adhesive layer). Although it is good, it is desirable from the viewpoint of adhesive strength that the top coat layer is not applied to the portions that become both end portions that are overlapped by the can body (particularly the side that is the lower side when they are overlapped).
[0078]
In a film sticking apparatus provided with a film sheet of a size to be stuck to a can body, a bottomed cylindrical two-piece can body without a side seam portion that is continuously fed while being heated after molding processing. On the other hand, each continuously supplied film sheet is attached to a cylindrical can body of each heated can body by an adhesive layer and temporarily bonded, and further rolls before the adhesive layer is solidified. After being bonded by pressing, the bottomed cylindrical film sticking can body is sent out to subsequent processing steps such as inner surface coating, neck-in processing, and flange processing.
[0079]
According to the can with hologram of this embodiment manufactured as described above, the relief hologram 3a is formed on the surface of the resin film 3 attached to the metal plate 2 of the can body of the can 1. As a result, a relief hologram is directly formed on the metal surface of each metal can body, or a transfer sheet having a hologram forming layer on the can body of a printed can body is thermally transferred. As compared with the above, the relief hologram can be easily and efficiently applied to the can 1 and the can manufacturing cost can be reduced.
[0080]
And in the can 1 in which the relief hologram 3a is formed on the surface of such a resin film 3, the relief hologram forming surface 3a with extremely fine irregularities is a portion (in the present embodiment, a lattice pattern). In particular, by being covered with the top coat layer 8 of a transparent curable resin containing a lubricant, the following effects can be obtained.
[0081]
That is, from the viewpoint of protecting the surface of the can body 1 and molding the can body, a top coat layer 8 of a transparent curable resin containing a lubricant is partially provided (with a coverage of 50% or more). As a result, it is possible to improve the slipperiness of the surface of the can body compared to the case where there is no such topcoat layer 8, and slipperiness with a guide or the like when transporting the can body, In addition, it can improve the slipperiness with the tool (processing tool) when forming the can body in mouth drawing (neck-in processing), etc., so that the outer surface of the can body can be scratched or soiled in the can manufacturing process or can manufacturing process. And generation of dents can be prevented.
[0082]
In order to achieve the above-described effects, it is necessary to cover at least 50% or more of the surface of the can body of the can body 1 with the top coat layer 8, and a hologram formed by a portion where the top coat layer 8 is not provided. In consideration of the decorative effect of the above, as the coverage of the top coat layer 8 is increased, the above-described effect becomes higher, for example, In each shape as shown in FIGS. Hologram effect , When it is intended to obtain only a part of the surface of the can body, the coverage of the top coat layer 8 can be made very close to 100%.
[0083]
Further, from the viewpoint of the decorative effect of the hologram of the can 1, in the portion where the top coat layer 8 is not provided, on the color or pattern by the printing layer 5 formed on the back side of the transparent thermoplastic resin film 4. While a hologram effect that shines in rainbow colors is obtained with the holograms stacked, the hologram effect is completely lost by filling the hologram forming surface 3a in the portion where the top coat layer 8 is provided, and printing is performed. The colors and patterns of the layer 5 are clear.
[0084]
Accordingly, the hologram pattern can be easily and economically changed in various ways just by changing the application pattern of the top coat layer 8 applied on the same relief hologram forming surface 3a by the application roller. In addition, in the portion having the hologram effect where the top coat layer 8 is not provided, the rainbow color shines on the upper side of the color and pattern by the printing layer 5 through the relatively thick transparent thermoplastic resin 4 depending on the viewing angle. Since holograms are applied in layers, compared to the case where a hologram pattern is simply formed on a portion without a print pattern or a hologram with a metal-deposited reflective layer is formed on the print pattern, the same can body Even if you look at the part, depending on the position of the viewer, you can see the rainbow color by the hologram or see the printed pattern, which can give a strong impression to the viewer. Rutotomoni, it is possible to obtain a decorative effect with overall thicker depth.
[0085]
As mentioned above, although one Embodiment of the can with a hologram of this invention was described, this invention is not limited only to the above embodiments, For example, in the above-mentioned this embodiment, a thermoplastic resin film 4 is provided over the entire surface of the hologram forming layer 7 to form the relief hologram 3a on the entire surface of the hologram forming layer 7. However, the hologram forming layer 7 may be partially provided, It is also possible to carry out by partially forming the relief hologram 3a on the surface of the thermoplastic resin film, and further, as shown in FIG. It is also possible to carry out by forming the relief hologram 3a directly on the surface opposite to the printing layer 5).
[0086]
When the relief hologram 3a is directly formed on the surface of the thermoplastic resin film 4 as described above, the melting point of the resin used as the material of the thermoplastic resin film 4 needs to be about 160 to 255 ° C. When the melting point is 160 ° C. or less, after forming the relief hologram 3a with irregularities of extremely fine intervals on the surface of the thermoplastic resin film 4, in the step of adhering to the metal plate 2 by thermal bonding, the thermoplasticity The uneven shape of the hologram formed on the surface of the resin film 4 may disappear due to softening or melting of the resin.
[0087]
Further, in this embodiment, the top coat layer 8 covering the hologram forming surface 3a is also provided as a lattice pattern as shown in FIG. 6A. For example, FIG. It is also possible to implement as various other patterns as shown in FIG. Ru .
[0089]
In any case, in the can with a hologram of the present invention, The portion that remains as a hologram without covering the top coat layer 8 , The thin lines have a thickness of 0.2 to 0.5 mm and the interval between the thin lines is 1.0 to 2.0 mm, or a combination of thin lines or a combination of thin lines, or a single figure (or point) The maximum dimension portion (the dimension indicated by a in FIG. 6) is 1.0 to 3.0 mm, and the pitch between each figure (or point) (the dimension indicated by b in FIG. 6) is 1.5. A repetitive pattern of figures (or dots) to be -4.0 mm By doing , So that the hologram is dispersed small Have .
[0090]
In such a way, the portion to be left as a hologram is dispersed small, so that small printed characters used for explanation of contents and cautionary notes are obstructed by the rainbow color of the hologram depending on the viewing angle and become almost unreadable The situation can be avoided, and a unique decorative effect by a fine hologram pattern can be obtained.
[0091]
Therefore, it is not necessary to apply a means such as not forming a hologram in advance on a portion where small characters are printed or applying a top coat layer to eliminate the hologram effect. In addition, it eliminates the troublesome work of aligning the specific position on the opposite side of the film during printing (the portion without the hologram effect) and the portion where the small character is printed, making the printing work easier. Productivity will also be good.
[0092]
【The invention's effect】
According to the can body with a hologram of the present invention as described above, the relief hologram is formed on the surface of the resin film adhered to the can body, thereby greatly increasing the manufacturing process and improving the work efficiency. A hologram can be satisfactorily formed on the surface of the can body without significant reduction.
Moreover, in such a can body with a hologram attached to a film, the sliding performance of the can body can be secured, and the occurrence of dirt and scratches on the surface of the can body in the can making process and the can manufacturing process can be prevented. You can do it.
In addition, the holographic pattern formed on the can shows a rainbow color or a printed pattern depending on the position of the viewer, giving a strong impression to the viewer and deeper. A decorative effect can be obtained, and the hologram pattern can be easily and economically diversified only by changing the coating pattern of the top coat layer.
Furthermore, by dispersing the hologram pattern small by applying the topcoat layer, it is possible to avoid that the printed characters provided in the lower layer of the hologram forming surface are disturbed by the rainbow color of the hologram and become difficult to read, Moreover, it is possible to obtain a unique decorative effect due to the fine hologram pattern.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a part of a can body portion of a can body to which a resin film is attached, and (B) the can body according to an embodiment of a can body with a hologram of the present invention. The elements on larger scale of a cross section.
FIG. 2 is a schematic explanatory view of the can body cross section shown in FIG. 1B as viewed obliquely from above.
FIG. 3 is a schematic explanatory view showing an example of a manufacturing process of a printed and hologram-formed resin film used as a film for sticking a can in the can with a hologram of the present invention.
4 is a cross-sectional explanatory view showing the state of the film in each step of the manufacturing process of the resin film for sticking a can body shown in FIG. 3. FIG.
FIG. 5 is a partially enlarged sectional view showing a transverse section of a can body in another embodiment of a can body with a hologram of the present invention.
FIGS. 6A and 6B are explanatory views showing three examples (A), (B), and (C), respectively, of patterns when a top coat layer is partially covered in the can with a hologram of the present invention.
[Explanation of symbols]
1 Film sticking can (hologram can)
2 Metal plate (can body)
3 Resin film
3a Relief type hologram (hologram forming surface)
4 Thermoplastic resin film
5 Print layer
6 Adhesive layer
8 Topcoat layer
7 Hologram formation layer

Claims (4)

The outer peripheral surface of the can body metal plate through an adhesive layer in which a printed resin film with a printed layer applied to one surface of a transparent thermoplastic resin film as a main layer is applied to cover the printed layer In a film sticking can body that is stuck to the surface of the resin film, a relief hologram with extremely fine unevenness is formed on the surface opposite to the can body metal plate side of the resin film and contains a lubricant. By partially covering the hologram formation surface with a topcoat layer of a transparent curable resin, the portion left as a hologram that is not covered with the topcoat layer becomes a pattern due to repeated fine lines or a combination of fine lines, And the can with a hologram characterized by being formed so that the thickness of this thin wire may be 0.2-0.5 mm, and the space | interval between these thin wires may be 1.0-2.0 mm . The outer peripheral surface of the can body metal plate through an adhesive layer in which a printed resin film with a printed layer applied to one surface of a transparent thermoplastic resin film as a main layer is applied to cover the printed layer In a film sticking can body that is stuck to the surface of the resin film, a relief hologram with extremely fine unevenness is formed on the surface opposite to the can body metal plate side of the resin film and contains a lubricant. By partially covering the hologram forming surface with a top coat layer of a transparent curable resin, a portion that is not covered with the top coat layer and remains as a hologram becomes a pattern with a regular repeating pattern, and one hologram-including cans, characterized in that the largest dimension of the graphic or point is 1.0 to 3.0 mm, the pitch between each shape or point is formed such that 1.5~4.0mm . The can with hologram according to claim 1 or 2 , wherein a hologram forming layer of a transparent curable resin is provided on the opposite side of the transparent thermoplastic resin film serving as the main layer. . Topcoat layer covering the forming surface of the relief hologram partially is, in any one of claims 1 to 3, characterized in that covers the hologram formation surface at a coverage rate of 50% or more and less than 100% The can with hologram as described.

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