JP5417801B2 - LAMINATE FOR LASER PRINTING AND LASER PRINTING METHOD - Google Patents

Description

  The present invention relates to a laminate for laser printing capable of printing minute figures and characters by laser light irradiation, an adhesive label using the laminate for laser printing, a food, a pharmaceutical and a pharmaceutical using the laminate for laser printing. Bags used for packaging of quasi-drugs and medical devices, etc., packaging bodies used for storing liquids, viscous bodies, solids, powders, granules, etc., using the laminate for laser printing, The present invention also relates to a printing method using laser light.

  2. Description of the Related Art Conventionally, a package body in which contents are stored is circulated by preparing a bag body by heat-sealing the peripheral edge using a laminate having heat sealability. These packages are printed with characters and designs that can be visually confirmed by consumers, such as product names, contents, precautions for use, etc. The code is printed as fixed information for the product. Such fixed information is printed at the stage of manufacturing packaging materials, while variable information such as expiry date, lot number, etc. that can be changed on a daily basis is used with thermal printers, inkjet printers, laser printers, etc. In many cases, a label printed directly on the laminate or previously adjusted using the printing means is attached to a product or its package.

  In addition to the expiry date, such fluctuation information includes the date of manufacture, date of manufacture, and lot number, and further information on traceability such as information on raw materials of products due to the recent increase in public interest in safety and security. Are described in individual products, particularly in the fields of foods, pharmaceuticals, quasi drugs or medical devices. Correspondingly, printing of barcodes including two-dimensional barcodes such as GS1DataBar that can carry a lot of information is being implemented.

  Here, as a method for displaying the fixed information and the fluctuation information on the packaging laminate, the fluctuation information is directly printed on the packaging laminate on which the fixed information is printed, or the packaging laminate is changed. A method for directly printing information and fixed information on a packaging machine has been proposed (see Patent Document 1).

  As a general printing method, there is a method of placing ink directly on the surface of a laminate using a thermal printer or an ink jet printer, and consumables such as ink ribbons of a thermal printer and ink of an ink jet printer are expensive. In order to print a large amount of variation information, there is a problem that the running cost becomes high. Further, if these consumables are not replaced, printing leakage may occur. In addition, fluctuation information is directly printed on the packaging laminate by offset printing using UV curable ink. However, the printing scrape may be affected by dirt on the surface of the packaging laminate or uneven thickness of the packaging laminate. Or missing characters may occur.

  As a method for solving these problems, there is a method of printing by irradiating a laser beam. For example, a laminate for laser printing produced by applying white ink, black ink and OP varnish on an aluminum vapor-deposited surface of aluminum vapor-deposited paper is disclosed (Patent Document 2). The method described in Patent Document 2 is a problem of the prior art, that is, in a printing method in which laser-colored ink that has been pre-printed is irradiated with a laser beam to develop color, high-speed printing is possible. Inferior in chemical resistance, etc., forming a colored ink layer on the label paper substrate, removing the colored ink layer by irradiating laser light, and printing in contrast with the color of the underlying label paper substrate In this case, the clearness of printing is insufficient, and the overcoat layer and ink layer of the printed part are completely removed, so that the printed part may lack scratch resistance, water resistance, etc. With the above configuration, clear printing can be performed at high speed by laser light irradiation, and the printed portion is excellent in light resistance, scratch resistance, water resistance, chemical resistance, and the like. .

Also disclosed is a method for attaching a label to a transparent container. That is, an adhesive layer and a transparent substrate sheet are laminated on the release sheet, and a display portion composed of an opaque coating film is formed on the surface of the transparent substrate sheet, and the opaque substrate is formed on the back surface of the transparent substrate sheet. It is a label on which a shielding part made of a coating film of a color different from the coating film is formed, and the shielding part is removed by irradiating the display part with a laser beam to remove the opaque coating film in a predetermined part. The label which can visually recognize a character etc. by the difference in color is disclosed (refer patent document 3).
JP-A-10-181721 JP-A-9-123607 JP 2006-220695 A

  However, the technology described in Patent Documents 2 and 3 removes the upper layer that easily absorbs laser light by laser light irradiation, exposes the lower layer, and forms visible characters from the difference in color between the upper and lower layers. Technology. Therefore, the upper layer is limited to a material that easily absorbs laser light, and conversely, the lower layer is limited to a material that hardly absorbs laser light and has a color contrast with the upper layer. That is, the carbon black-based material (black) that easily absorbs laser light is the upper layer, the titanium oxide-based material (white) is the lower layer, and characters printed by laser light irradiation are white characters on a black background. .

However, rather than white characters and figures being formed on a black background, it is a familiar aspect in daily life that black characters and figures are formed on a white background. It is clear that visibility is good even when people handle it.
Furthermore, in the techniques described in Patent Documents 2 and 3, since the ink layer applied as a laser printing portion is exposed on the surface of the laminate, the laser printing portion may rub and ink may fall off.

  In view of the above circumstances, the present invention has good visibility, excellent friction resistance, and improves the reading accuracy when reading a fine pattern such as GS1DataBar with a machine. It aims at providing the laminated body for laser printing, a bag body, a package body, a label, and the laser printing method which are obtained by this.

As a result of examining the laminated body for laser printing in detail, the inventor is provided with a white ink layer partially containing a titanium oxide pigment from the transparent base film on the outer layer side toward the inner layer side. The laminate for laser printing in which the heat-adhesive resin layer is provided on the inner layer side and the aluminum layer is further provided on the inner layer side, for example, irradiates YVO4 laser light or the like from the outer layer surface side of the transparent base film. Therefore, fine laser printing is possible, and the obtained laser print is not only good in visibility but also machine readable, and the outermost surface is not an ink layer but a transparent substrate film Thus, the present invention was completed by finding that it was excellent in wear resistance.

That is, the invention according to claim 1 of the present invention contains a titanium oxide pigment from the transparent base film on the outer layer side toward the inner layer side in the laminate for laser printing in which figures and characters are formed by laser light irradiation. A white ink layer is partially provided, a molten low density polyethylene resin layer or a molten ethylene / acrylic acid copolymer resin layer is provided on the inner layer side, and an aluminum layer is further provided on the inner layer side. The laser-printed laminate is characterized in that a blackened design is formed on the white ink layer by irradiating laser light from the outer layer surface side of the transparent substrate film.

  The invention according to claim 2 of the present invention is the laminate for laser printing according to claim 1, wherein a heat seal layer is provided at least in the innermost layer. It is.

Further, in the invention according to claim 3 of the present invention, a laser beam is irradiated from the outer layer surface side of the transparent base film to the laminated portion having the white ink layer of the laminate for laser printing according to claim 2. By this, a blackened design is formed on the white ink layer , which is a laminate with laser printing.

  In the invention according to claim 4 of the present invention, at least the innermost layer of the laminate for laser printing according to claim 1 is provided with an adhesive layer, and the laminated portion having the white ink layer is irradiated with laser light. By doing so, a blackened design is formed, and this is an adhesive label.

  In the invention according to claim 5 of the present invention, the heat seal layers of the innermost layer of the laminate for laser printing according to claim 2 are opposed to each other, and the outer periphery other than the portion to be the opening is heat sealed. A bag body for laser printing, which is formed in a bag shape.

  In the invention according to claim 6 of the present invention, the heat seal layers of the innermost layer of the laminate with laser printing according to claim 3 are opposed to each other, and the outer periphery other than the portion to be the opening is heat sealed. A bag body with laser printing, characterized in that it is formed in a bag shape.

  In the invention according to claim 7 of the present invention, the heat seal layer of the innermost layer of the laminate for laser printing according to claim 2 is opposed to the heat seal layer of the second laminate having the heat seal layer. And a bag body for laser printing, wherein the outer periphery other than the portion to be the opening is heat-sealed to form a bag shape.

  In the invention according to claim 8 of the present invention, the heat seal layer of the innermost layer of the laminate with laser printing according to claim 3 is opposed to the heat seal layer of the second laminate having the heat seal layer. A bag body with laser printing, characterized in that the outer periphery other than the portion that becomes the opening is heat-sealed to form a bag shape.

  Further, the invention according to claim 9 of the present invention is that the contents are stored in the bag according to any of claims 5 to 8, and the opening of the bag is sealed by heat sealing. It is the package which is characterized.

  In the invention according to claim 10 of the present invention, the contents are stored in a plastic container capable of heat-sealing the opening, and the opening and the innermost layer of the laminate with laser printing according to claim 3 are provided. A packaging body characterized in that the plastic container and the laser-printed laminate are sealed by heat sealing so that the heat seal layers are opposed to each other.

Moreover, the invention which concerns on Claim 11 of this invention is from the outer-layer surface side of the said transparent base film to the laminated part which has the said white ink layer of the laminated body for laser printing in any one of Claims 1-2. It is a laser printing method characterized by irradiating a laser beam to form a blackened design on the white ink layer.

  The invention according to claim 12 of the present invention is the laser printing method according to claim 11, wherein the laser beam is YVO4 laser beam.

The laminated body for laser printing of the present invention has the above-described configuration, and without using a special material such as color ink, under the conditions specified in the claims, but only general materials. A layered product can be formed, and by irradiating a scanning laser beam , a black ink design such as GS1DataBar, symbols, characters, and designs including a two-dimensional barcode are formed with high contrast. The fine laser-printed pattern can be machine-readable as well as visually confirmed. In the laminate for laser printing of the present invention, the outermost surface is not an ink layer, but a transparent substrate film, so there is no risk that the laser-printed design will disappear due to rubbing and wear resistance. Also excellent in properties.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing the basic structure of a laminate 1 for laser printing according to the present invention, and a white color containing a titanium oxide pigment as a laser printing portion from the transparent base film 2 on the outer layer side toward the inner layer side. It shows that the ink layer 3 is partially provided, the thermal adhesive resin layer 4 is provided on the inner layer side, and the aluminum layer 5 is further provided on the inner layer side. Here, as the aluminum layer 5, generally an aluminum foil is preferably used.

  If it is a laminated body which has this basic composition, it can be used as a laminated body which concerns on this invention, even if it carries out additional processes, such as bonding of various coatings and various films, to the aluminum layer or aluminum foil surface.

  Moreover, if it is a laminated body which has this basic structure, you may provide various intermediate | middle layers between each layer. For example, an anchor coat layer may be provided on the bonding surface of the transparent base film 2 and the heat adhesive resin layer 4 as necessary.

  Further, inside the transparent base film 2, in addition to the part where the white ink layer 3 is provided, a printing part such as characters and designs may be provided, or a part between the white ink layer 3 and the transparent base film 2 may be provided. For example, a print layer of characters, designs, etc. may be provided.

  The transparent substrate film 2 used in the present invention has visible light permeability, functions as a substrate for various printing parts including a laser printing part, and further functions as a protective layer for various printing parts. To do.

  The transparent substrate film 2 is not limited to a single layer and may be a multilayer although not particularly shown. However, since the visible light transmittance decreases as the number of layers increases, and the amount of laser light absorption of the transparent substrate film increases and foams in some cases, foaming is more preferable.

  The transparent base film 2 is made of a polyolefin resin such as polyethylene or polypropylene, an acrylic resin mainly composed of polystyrene, polyvinyl chloride, polyvinyl alcohol, ethylene-vinyl alcohol, polyamide, acrylic ester or methacrylic ester. , Polyethylene terephthalate, polybutylene terephthalate, polyesters such as polyethylene naphthalate, polyacetal, acetyl-di- or tri-cellulose fiber derivatives, stretched or unstretched films made of polycarbonate, etc., or laminates with these films, etc. Among them, the biaxially stretched polyethylene terephthalate film is excellent in both heat resistance and cost.

  In addition, if the thickness of the transparent substrate film is too thick, the amount of laser light absorption increases, the amount of laser light absorption varies depending on the material, and also affects the waist of the laminate. Although not limited, it is usually selected in the range of 6 to 50 μm, preferably 12 to 25 μm in consideration of the performance required of the transparent substrate film, such as the waist and strength of the laminate.

  The white ink layer 3 used in the present invention functions as a laser printing section, is made of an ink containing a titanium oxide pigment, and a printing method for providing a white ink layer is white using a titanium oxide white pigment. Gravure printing, offset printing, letterpress printing, and flexographic printing may be used as long as they use a printing method that can take up the film after printing. The gravure printing method is suitable in that it can be easily applied in a large amount, thereby improving the concealing property of the lower aluminum layer 5.

  Between the white ink layer 3 and the transparent substrate film 2, it is good to provide the printing layer which printed beforehand the character used in combination with laser printing. For example, if characters such as “manufacturing date:”, “expiration date:”, “lot number:” are printed and characters such as predetermined numbers are laser-printed at positions corresponding to the characters, laser printing is performed. Can be shortened.

The heat-adhesive resin layer 4 used in the present invention functions as an adhesive layer for bonding the transparent base film 2 and the aluminum layer 5, and further blackened into the white ink layer 3 by laser light irradiation. It functions in a phenomenon that causes a design.

  Examples of the thermal adhesive resin layer 4 include polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, ionomer, polypropylene, acid-modified polyolefin, ethylene / vinyl acetate. Single layer or multiple layer resins such as saponified copolymers and cyclic polyolefins can be used. Specifically, for example, a molten low density polyethylene resin or a molten ethylene / acrylic acid copolymer resin is preferable. In general, the transparent base film 2 and the aluminum foil are extruded and laminated through the thermal adhesive resin layer 4, but an anchor coating agent may be applied to the transparent base film side as necessary.

  In addition, when a transparent base film and an aluminum foil are bonded together by dry lamination using, for example, a two-component curable urethane resin adhesive instead of a heat-adhesive resin, a clear laser printing is obtained. This is not preferable.

  An anchor coat agent is applied to the bonding surface of the transparent base film 2 and the heat-adhesive resin layer 4 as necessary. When using an anchor coating agent, organic titanium-based, isocyanate-based (urethane-based), polyethyleneimine-based, polybutadiene-based, etc. Select according to use conditions such as the presence or absence of sterilization.

The aluminum layer 5 used in the present invention functions to generate a blackened design on the white ink layer 3 by irradiation with laser light. Further, the aluminum layer 5 is shielded from the laser light and is inner side of the aluminum layer 5. It functions so as not to affect the laser beam. Moreover, when processing a laminated body and forming a bag body and a package body, it functions also as a protective layer of the contents.

  As the aluminum layer 5, for example, a general JIS standard 1N30 grade aluminum foil, and a soft aluminum foil that can be bonded together, there is no limitation on the grade such as JIS standard 8021 and 8079.

  Further, the thickness of the aluminum foil is not particularly limited, and may be selected in consideration of barrier properties, bendability, cost suitability, etc. according to the use of the laminate, and is generally 6.5 to 20 μm. Sano aluminum foil is used.

  Further, a normal aluminum foil has a matte surface and a glossy surface on the opposite surface, but any surface can be used with the transparent base film side facing. Even double-sided brushed aluminum foil and double-sided glossy aluminum foil can be used.

Moreover, since the aluminum foil of the present invention functions to shield laser light and blacken the white ink layer , it is formed not only by the aluminum foil laminated and bonded, but also by methods such as vapor deposition and sputtering. An aluminum layer may be used.

FIG. 2 is a schematic cross-sectional view showing an example of another configuration of the laminate for laser printing of the present invention.
That is, the laminate for laser printing according to the present invention may have a configuration in which a heat seal layer 7 is further provided on the inner layer side of the aluminum layer 5 via the adhesive layer 6 as shown in FIG. By providing the heat seal layer 7, the laminated body for laser printing can be affixed to other articles or the like, or processed to form a bag or a package.

  The film used for the heat seal layer 7 can be used as long as it has heat seal properties. For example, polyethylene, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer It is possible to use a single-layer film having heat sealability such as a coalescence, ionomer, polypropylene, acid-modified polyolefin, saponified ethylene / vinyl acetate copolymer, cyclic polyolefin, polyacrylonitrile, polyester, or a co-pressed film of these resins. it can. Furthermore, a co-extruded multilayer film of the above resin and a resin having gas barrier properties and toughness such as saponified ethylene / vinyl acetate copolymer and nylon can also be used.

  The adhesive layer 6 and its laminating method may be laminated by a T-die extrusion lamination method using a heat-adhesive resin, or a dry laminating method using a two-component curable urethane adhesive. May be laminated. Alternatively, a single layer or a T-die extrusion lamination method using a melt heat adhesive resin by coextrusion may be used. In the case of the T-die extrusion lamination method, an anchor coating agent can be used as necessary.

  The heat seal layer 7 may be melt-extruded resin coated directly on the aluminum foil surface without using an adhesive layer. When melt-extrusion resin coating is performed on the aluminum foil surface, an anchor coating agent is used as necessary. Further, hot melt or the like may be coated on the aluminum foil surface.

  Although the thickness of the heat seal layer varies depending on the purpose of use of the bag or package formed using the laminate for laser printing of the present invention, a thickness of about 5 μm to 200 μm is preferable. .

  Although not particularly illustrated, a single layer or a multi-layered intermediate layer may be provided between the aluminum foil and the heat seal layer for the purpose of reinforcing the laminate or other reasons.

  FIG. 3 is a schematic sectional view of a pressure-sensitive adhesive label 100 formed by providing a pressure-sensitive adhesive layer 8 on the inner surface side of the aluminum layer 5 of the laminate 1 for laser printing of the present invention. The pressure-sensitive adhesive label of the present invention may be formed by providing a pressure-sensitive adhesive layer 8 after a film is separately attached to the inner surface of the aluminum layer of the laser-printed laminate 1.

  Here, in FIG. 3, the release paper is not particularly illustrated, but the adhesive label 100 is usually distributed in a form in which the release paper is pasted on the adhesive surface.

  When the adhesive label 100 is subjected to laser printing of variable information and is attached to some product, it is preferable to perform laser printing in a state where the adhesive label 100 is attached to a rolled release paper. This is because it is easy to maintain the flatness of the adhesive label 100.

4, in laser printing laminate 1 of the present invention shown in FIG. 1, imaginary view showing the irradiation of the laser beam, a state in which laser printing unit 9 is formed is a design in which blackening on the white ink layer 3 It is.

When performing laser printing on the laminate 1 for laser printing according to the present invention, the white ink layer 3 is irradiated with scanning laser light whose energy is controlled from the outer layer side of the transparent base film 2. Thus the color development of black occurs in the white ink layer 3, laser printing unit 9 is a design which is blackened on the white ink layer 3 is Ru is formed. This allows two-dimensional, such as a fine LED GS1DataBar, which can be read by a CCD camera, including a red LED reader, visually readable JAN codes, EAN codes, designs, characters, etc., with a gray to black contrast on a white background. Symbols including bar codes can also be printed.

  Although the details of the principle that enables laser printing on the white ink layer 3 by such a method are unknown, it is considered as follows from the observation results. As shown schematically in FIG. 4, when the cross section of the laminate of the laser-printed part is observed with an optical microscope, the transparent substrate film 2 on the surface has holes in some places, but most of them disappear by irradiation with laser light. And the white ink layer 3 is changed from dark gray to black by a black substance that seems to be carbon powder generated from the thermal adhesive resin layer 4, and the thermal adhesive resin of the laser printing portion Since the layer 4 and the aluminum layer 5 are almost intact, when the laminated body 1 is irradiated with a laser beam, a part of the laser beam is transmitted through the white ink layer 3 and a part of the laser beam is a heat-adhesive resin. The titanium oxide powder contained in the white ink layer 3 is heated from both the front and back surfaces by passing through the layer 4 to reach the aluminum layer 5 and reflected by the aluminum layer 5 and reaching the white ink layer 3 from the back side. Thermally adhesive resin is heated in contact with the color ink layer 3, although carbide, titanium oxide pigment of the white ink has high heat resistance temperature is considered to remain intact.

  In addition, when the irradiation condition of the laser beam was changed, if the irradiation energy was too strong, the transparent base film 2 in the irradiated portion disappeared, the heat-adhesive resin layer 4 foamed and did not retain the original shape, and was too weak. No black coloration is observed in the white ink layer 3 and there is almost no change in appearance.

The type of laser beam used in the present invention is not particularly limited, and a YVO4 laser that can finely control the amount of energy and has a high transmittance with respect to the transparent substrate film 2 can be suitably used. In the single mode in which the power peak is concentrated at one central point of the beam, fine printing without unevenness can be achieved more preferably.
In addition, the laser beam scanning method is not limited to laser light, but is widely used. The galvano scanning method has high irradiation accuracy and can achieve high-speed printing by clarifying printing by increasing the irradiation speed. Is suitable.

  FIG. 5 is a perspective view of a wound laminate original 120 in which a plurality of rows of the laser-printed laminates 1 of the present invention are continuous.

  In the embodiment of the laminate 1 for laser printing according to the present invention, for example, as shown in FIG. 5, a character, a design, and the laser printing unit 12 are continuously printed in one or more rows. And has a feature that it can be manufactured in a large amount at a high speed using a wide-width film. In general, a frame is not printed on the laser printing unit 12, but in FIG. 5, the frame is shown for convenience. However, the frame may actually be printed on the laser printing unit 12.

  FIG. 6 is a perspective view of a wound laminate 130 obtained by cutting the wound laminate original 120 shown in FIG.

  When the laminated body for laser printing 1 of the present invention is used as a packaging material in a packaging machine to form a bag, for example, a heat seal layer is provided on the innermost layer of the laminated body 1 for laser printing, to paste together. Moreover, when using the laminated body 1 for laser printing which concerns on this invention with a bag making machine, the case where it uses as the said winding-type laminated body 130, and the roll-shaped laminated body original fabric 120 are used as it is, Sometimes unnecessary parts are removed on the bagging machine.

  Here, laser printing can be performed immediately after unwinding the rolled-up laminate 130 or after manufacturing the bag body. However, if the surface of the substrate to be printed is large, the focus of the scanning laser beam is increased. Since it may not match, it is certain if it is performed when the substrate is flat. In particular, laser printing of variable information is usually performed when the contents are packaged. When the wound laminate is supplied to the packaging machine to form the packaging body, or the bag body is packaged by the packaging machine. In any case where a package is formed by supplying to the substrate, it is preferable to perform laser printing immediately before packaging the contents. However, this is not the case when the flatness of the laser printing unit 12 can be ensured even after packaging the contents. The same applies to the case where the laser-printed adhesive label 100 according to the present invention is applied.

  In addition, in order to block the hole of the transparent substrate film 2 on the surface of the laser printing portion of the laminate 1 for laser printing according to the present invention and prevent peeling and dirt during heat sterilization, a transparent label seal, a transparent adhesive tape, etc. May be affixed.

  FIG. 7 is a schematic external view showing an example (pillow bag) with a laser-printed bag 140 made from the wound laminate original fabric 120 according to the present invention. The bag body with laser printing 140 is made into a bag shape by facing the heat seal layers 7 provided in the innermost layer of the laminate 1 for laser printing shown in FIG. As the form of the bag body, a three-side seal type, a four-side seal type, a standing pouch, a gusset type, an envelope-attached seal type, a pillow type, etc. can be arbitrarily selected, and it is not particularly limited. Absent.

  Moreover, as a method of heat sealing, it can carry out by well-known methods, such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, an ultrasonic seal, for example. In addition, you may provide the notch part 15 for opening as an easily openable means in the heat seal part of a bag-shaped body.

  Further, as illustrated in FIG. 8, the laser-printed bag body 140 according to the present invention may be one in which two laminated bodies face each other and the outer periphery other than the portion that becomes the opening is heat-sealed. . In this case, one side is the laminate for laser printing according to the present invention, but the other side is any laminate as long as the laminate has a heat-sealable layer that can be heat-sealed with the laminate for laser printing. For example, if it is a transparent laminate, the contents can be visually recognized without opening, and if a barrier transparent laminate is used, in addition to that, if the oxygen scavenger 17 is enclosed together with the contents 16, Since oxygen in the atmosphere in the package is absorbed, it is possible to prevent the growth of aerobic microorganisms, and it is possible to prevent the oxidation of contents that are easily oxidized and deteriorated.

  Examples of the barrier film used for the barrier transparent laminate include, for example, a polyvinylidene chloride resin film, a resin film coated with a polyvinylidene chloride resin or a composition mainly composed of polyvinyl alcohol, and a stretched polyamide film. A resin film, a saponified ethylene-vinyl acetate copolymer film, a resin film having a transparent vapor-deposited film of a metal oxide such as silicon oxide or aluminum oxide can be used.

  In the above, the thickness of the inorganic oxide vapor-deposited film is preferably about 50 to 3000 mm, more preferably about 100 to 1000 mm.

  In the present invention, examples of the resin film that supports the vapor deposition layer imparting the barrier property include, for example, polyester resin films such as polyethylene terephthalate, polyamide resin films such as various nylons, polyethylene resins, polypropylene resins, Cyclic polyolefin resin, polystyrene resin, acrylonitrile-styrene copolymer (AS resin), acrylonitrile-butadiene-styrene copolymer (ABS resin), polyolefin film such as polybutadiene resin film, polyvinyl chloride resin, polycarbonate Resin, polyimide resin, polyamideimide resin, polyaryl phthalate resin, silicone resin, polysulfone resin, polyphenylene sulfide resin, polyethersulfone resin, polyurethane resin Can be used cellulose resin, poly (meth) acrylic resins, polyvinylidene chloride film, acetal resin film, fluorine-based resins, and other like.

  In some cases, a film having a barrier property such as saponified ethylene / vinyl acetate copolymer, cyclic polyolefin, polyacrylonitrile, or the like is used as the heat seal layer.

  FIG. 9 is a schematic external view showing an example of a package 150 with laser printing in which the contents 16 and the oxygen scavenger 17 are housed in the bag according to the present invention shown in FIG. 7 and the opening is sealed by heat sealing. is there.

  Encapsulating the oxygen scavenger 17 together with the contents 16 absorbs oxygen in the atmosphere in the package, so that the growth of aerobic microorganisms can be prevented, and oxidation of the contents that easily undergo oxidative degradation can be prevented.

  FIG. 10 is a side view of a package 160 in which a plastic container 18 capable of heat-sealing an opening is sealed using the laminate with laser printing of the present invention as a lid member 19, together with the contents 16. FIG. 11 is a schematic front view of the package 160 shown in FIG. 10 as viewed from the lid material side.

  Here, if an easy peel sealant for the plastic container 18 is used as the heat seal layer 7 of the laminate 1 for laser printing, it is preferable because easy-openability can be imparted.

  Further, the plastic container 18 may have any shape such as injection molding, sheet molding, blow molding, or the like that can seal the container when the lid material is heat sealed.

  Further, in the case where the laser-printed laminate 1 and the plastic container 18 have a barrier layer, if the oxygen scavenger 17 is enclosed together with the contents 16, oxygen in the atmosphere in the package is absorbed, so that aerobic microorganisms propagate. In addition, the content 16 can be prevented from being oxidized.

  FIG. 12 is a schematic external view showing an embodiment of the horizontal pillow packaging machine 30 for forming the package 150 using the laser-printed laminate 1 according to the present invention.

  The wound laminate 130 is set in the horizontal pillow packaging machine 30, and the laser printing laminate 1 is supplied by the constant feed roller 35a by the intermittent feed for each unit of the printed pattern to ensure the laser printing laminate 1 After laser printing is performed on the laminate 1 for laser printing by the laser beam irradiation device 31 on the cradle 34 that is set to be flat, whether or not the laser printing is normal is confirmed through the printing inspection device 32. In general, the laser printing unit is stopped at the inspection position of the print inspection apparatus 32 by printing a photoelectric tube mark or the like on the laser printing laminate 1 in advance and reading the position of the printing unit with a separate sensor. .

  After the printing inspection, the laser-printed laminate 1 passes through the dancer roll 33 while being moved up and down, and is continuously fed by the constant feed roller 35b. After being formed into a cylindrical shape, the contents 16 are encapsulated while being back-sealed by the heat seal device 36a, cut into a package 150 while being heat-sealed at the opening by the heat seal device 36b, and discharged. It is discharged out of the system by the conveyor 38.

  Here, the print inspection device 32 inspects the print content using a red LED, a CCD camera, or the like. And when a printing defect is found, an alarm signal is output, or in the packaging machine, a label serving as a mark is attached to the laminate including the defective printing portion, or the packaging of the contents is stopped and the defective laminate is used. It is also possible to manufacture an empty bag.

  The one-dimensional barcode can be read by either the red LED or the CCD camera, but the two-dimensional barcode can be read only by the CCD camera.

  Further, although not particularly illustrated, it is possible to seal the molded container by heat sealing by using the printed laminate 1 for laser printing as a cover material, such as an injection molded container, a blow molded container, a sheet molded container, etc. It can be used for a tray sealer or a foam-fill-seal type inline molding and filling machine.

  Although not specifically shown, the bag making machine can be laser-printed in the same manner as the packaging machine, and the supply method of the laminate differs depending on the bag making method. Since this is an intermittent feed, laser printing should be performed at such a position.

  Also, depending on the bag making system, opaque films such as sterilized paper may be inserted, or laminates and sterilized paper may be stacked to form a bag with a combination of different materials. However, the present invention can be applied by combining with a transparent laminate.

Next, the present invention will be described more specifically with reference to examples.
Example 1
A biaxially stretched polyethylene terephthalate film (product name “E5102”, manufactured by Toyobo Co., Ltd.) having a thickness of 16 μm and a width of 760 mm is selected as the transparent base film 2 of the laminate 1 for laser printing according to the present invention, and gravure printing is performed. Machine using orange ink (product name “CLIOS”, manufactured by The Inktec Co., Ltd.) on the corona-treated surface of the transparent substrate film 2, the design and characters are as shown in FIG. Printing was performed with a row width of 180 mm and four rows and a vertical pitch of 220 mm. As shown in FIG. 13, characters “manufacturing number”, “manufacturing date”, and “expiration date” are displayed at the position corresponding to the upper half of the laser printing portion of the white ink layer provided in the subsequent step. Printed on the left side. Thereafter, a white ink layer 3 (50 mm × 50 mm) serving as a laser printing portion was solid-printed using a titanium oxide pigment-based white ink (product name “CLIOS”, manufactured by The Inktec Co., Ltd.).

  Next, a two-component curable urethane anchor coating agent is applied to the printed surface of the printed biaxially stretched polyethylene terephthalate film, and a molten low density polyethylene resin having a thickness of 20 μm is used as the thermal adhesive resin layer 4. An aluminum foil having a thickness of 7 μm and a width of 740 mm was used as the aluminum layer 5 and bonded to the matte surface of the aluminum foil to obtain a laminate 1 for laser printing according to the present invention.

(Example 2)
A biaxially stretched polyethylene terephthalate film (product name “E5102”, manufactured by Toyobo Co., Ltd.) having a thickness of 16 μm and a width of 760 mm is selected as the transparent base film 2 of the laminate 1 for laser printing according to the present invention, and gravure printing is performed. In the same manner as in Example 1, using orange ink and a titanium oxide pigment-based white ink (product name “CLIOS”, manufactured by The Inktec Co., Ltd.) on the corona-treated surface of the transparent substrate film 2. , Letters, and laser print sections were printed.

  Next, a two-component curable urethane anchor coating agent is applied to the printed surface of the printed biaxially stretched polyethylene terephthalate film, and a molten ethylene / acrylic acid copolymer having a thickness of 20 μm is formed as the heat-adhesive resin layer 4. Using a resin, an aluminum foil having a thickness of 7 μm and a width of 740 mm was used as the aluminum layer 5 and bonded to the glossy surface of the aluminum foil to obtain a laminate 1 for laser printing according to the present invention.

(Example 3)
A biaxially stretched polypropylene film (product name “FOR”, manufactured by Phutamura Chemical Co., Ltd.) having a thickness of 20 μm and a width of 760 mm is selected as the transparent base film 2 of the laminate 1 for laser printing according to the present invention, and a gravure printing machine In the same manner as in Example 1, a blue ink and a titanium oxide pigment-based white ink (product name “CLIOS”, manufactured by The Inktec Co., Ltd.) were used on the corona-treated surface of the transparent base film 2. , Letters, and laser print sections were printed.

  Next, a two-component curable urethane anchor coating agent is applied to the printed surface of the printed biaxially stretched polypropylene film, and a molten ethylene / acrylic acid copolymer resin having a thickness of 20 μm is formed as the heat-adhesive resin layer 4. Was used, and an aluminum foil having a thickness of 7 μm and a width of 740 mm was used as the aluminum layer 5 and bonded to the matte surface of the aluminum foil to obtain a laminate for laser printing according to the present invention.

(Comparative Example 1)
A biaxially stretched polyethylene terephthalate film (product name “E5102”, manufactured by Toyobo Co., Ltd.) having a thickness of 16 μm and a width of 760 mm is selected as the transparent substrate film, and the corona-treated surface of the transparent substrate film is selected with a gravure printing machine. In the same manner as in Example 1, using the orange ink and the titanium oxide pigment-based white ink (product name “CLIOS”, manufactured by The Ink Tech Co., Ltd.), the design, characters, and laser printing part were printed. did.

  Next, the printed surface of the printed biaxially stretched polyethylene terephthalate film and the glossy surface of an aluminum foil having a thickness of 7 μm and a width of 760 mm are bonded together using a two-component curable urethane adhesive, for comparison. A laminate was obtained.

(Comparative Example 2)
A biaxially stretched polyethylene terephthalate film (product name “E5102”, manufactured by Toyobo Co., Ltd.) having a thickness of 16 μm and a width of 760 mm is selected as the transparent substrate film, and the corona-treated surface of the transparent substrate film is selected with a gravure printing machine. In the same manner as in Example 1, using the orange ink and the titanium oxide pigment-based white ink (product name “CLIOS”, manufactured by The Ink Tech Co., Ltd.), the design, characters, and laser printing part were printed. did.

  Next, a two-component curable urethane anchor coating agent is applied to the printed surface of the printed biaxially stretched polyethylene terephthalate film, and a molten low-density polyethylene resin having a thickness of 20 μm is extruded to a thickness of 40 μm and a width of 780 mm. A linear low-density polyethylene film (product name “XMTN”, manufactured by Phutamura Chemical Co., Ltd.) was bonded to the corona-treated surface to obtain a comparative laminate.

(Experiment 1)
The laminates prepared in Examples 1 to 3 and Comparative Examples 1 and 2 were cut to the size of A4 plate, and YVO4 laser printer (trade name “MD-V9900”, manufactured by Keyence Corporation) was used as the laser light irradiation device. As shown in FIG. 14, a minimum bar width of 0.17 mm composed of a one-dimensional barcode (RSS Limited) and a two-dimensional barcode (CCA) is used for the laser printing section of each laminate. RSS Limited CCA and letters such as numbers were printed on the table. In FIG. 14, RSS limited CCA is abbreviated.

  The character and RSS limited CCA according to the present invention are formed by expressing the scanning laser light irradiation portion in black with the white ink layer as the background of the base.

  And since the irradiation energy of the laser beam is not so great that the laser beam penetrates the aluminum foil, the lower layer side of the aluminum foil may have any configuration, and if an adhesive is applied, an adhesive label is obtained, and the heat seal layer If it bonds together, a heat seal laminated body will be obtained. Furthermore, if a film having heat sealability is bonded to the opening of the plastic container, a lid material can be obtained. However, no special technique is required for these lamination methods. A method of bonding with a film may be used.

  In addition, if a laser beam is irradiated with the energy amount which penetrates aluminum foil, a laminated body will be destroyed. Therefore, even if laser printing is performed on the pressure-sensitive adhesive label according to the present invention, an unpleasant odor that is generated by burning the pressure-sensitive adhesive when laser printing is performed on a general transparent label does not occur. It feels like a burning odor.

  Laser printing was performed while fixing the scan speed to 400 mm / s and adjusting the power and frequency.

  The results are shown in Table 1. The laminates of Examples 1 to 3 according to the present invention were able to obtain good laser prints within the range of conditions shown in Table 1, but the laminate of Comparative Example 1 was the most favorable condition. However, only thin lines can be reproduced, and the laminate of Comparative Example 2 can draw even thinner lines, or the white ink layer and the transparent substrate film are burned out. It was.

  Irradiation conditions for obtaining good laser prints with the laminates of Examples 1 to 3 shown in Table 1 are values when the scan speed is fixed at 400 mm / s. If the scan speed is changed, the optimum power, Since the frequency conditions are also different from those in Table 1, the structure of the laminate to be printed, such as the printing speed, the thickness of the transparent base film, and the thickness of the heat-adhesive resin layer, and the mechanical conditions The optimum laser printing conditions should be found according to the conditions.

  Subsequently, the printing quality was verified using a verification machine (trade name “TC201-RL”, manufactured by Munazo Co., Ltd.) after laser printing. The results are shown in Table 2. As shown in Table 2, Examples 1 and 3 were Grade B, Example 2 was Grade C, and Comparative Examples 1 and 2 were less than Grade F.

  The grade here is defined by the American standard ANSI X3.182. Symbols are measured with eight evaluation items such as determination of element edge, and the respective measurement results are A, B, C, D, F. The grade of the symbol to be measured is represented by the lowest evaluation grade among the eight evaluation results. Incidentally, A is the highest grade, D is the lowest grade, and F represents a defect. However, grade F can be read by a normal handy reader or inspection device, but if it is not regarded as a symbol, evaluation of grade F cannot be obtained. In general, use of grade C or higher is recommended.

  As is clear from the above laser printing and verification results, the laminated body in which the laser printing conditions and the grade of the printed matter differ depending on the surface state of the aluminum foil on the laser light irradiation surface side, but the transparent base film is a multilayer. If the laser printing conditions are severe due to the mechanical conditions such as high speed printing required, the range of the laser printing conditions will be widened. If a verification grade is required, the laser light irradiation surface side of the aluminum foil should be a matte surface.

(Experiment 2)
Two-component curing of a linear low density polyethylene film (product name “L4102”, manufactured by Toyobo Co., Ltd.) having a thickness of 40 μm and a width of 740 mm as a heat seal layer on the aluminum foil surface of the laminate of Example 1. After laminating using a type urethane adhesive, the adhesive was cured, and then slit to obtain a roll-up laminate of the laminate for laser printing according to the present invention having a width of 180 mm.

  Using a horizontal pillow wrapping machine equipped with the YVO4 laser printer, the heat-seal width was obtained while performing laser printing at a scanning speed of 400 mm / s, a power of 40%, and a frequency of 60 kHz using the wound laminate. While forming a 15 mm back seal, a heat seal width of 10 mm, a pillow bag of 220 mm length and 80 mm width, a sheet of candy coated with a blue mold spore suspension as the contents, an oxygen scavenger (product name “ AGELESS FX-50 "(manufactured by Mitsubishi Gas Chemical Co., Inc.) was housed to obtain a package according to the present invention.

After packaging, as a result of reading the printed part of the package using a handy reader (trade name “BT-951”, manufactured by Keyence Corporation), reading both RSS Limited and CCA data I was able to.
Further, as a result of culturing the package for 2 weeks at 28 ° C., the growth of blue mold was not observed.

It is a schematic sectional drawing which shows the basic composition of the laminated body for laser printing of this invention. It is a schematic sectional drawing which shows an example of a structure of the laminated body for laser printing of this invention, and shows what the heat seal layer is provided in the inner layer side of the aluminum layer through the contact bonding layer. It is a schematic sectional drawing of the adhesive label formed by apply | coating an adhesive on the aluminum layer of the laminated body for laser printing of this invention. FIG. 2 is an imaginary view showing a state in which a blackened design is formed on a white ink layer by irradiation with laser light in the laminate for laser printing of the present invention shown in FIG. 1. 1 is a perspective view of a roll-shaped laminate original fabric in which a plurality of rows of laser-printed laminates of the present invention are continuous. FIG. FIG. 6 is a perspective view of a wound laminated body obtained by cutting the wound laminated original sheet shown in FIG. 5 at a cutting point. It is a schematic external view which shows an example of the bag body with a laser printing produced from the laminated body for laser printing concerning this invention. It is a schematic external view which shows an example of the bag body with a laser printing produced from the laminated body for laser printing concerning this invention. It is a schematic external view which shows an example of the package body with a laser printing which accommodated the content and oxygen absorber in the bag body which concerns on this invention shown in FIG. 7, and sealed the opening part by heat seal. It is a side view of a package formed by sealing a plastic container capable of heat-sealing an opening portion using the laminate with laser printing of the present invention as a lid, and a state in which an oxygen scavenger is stored together with contents It is shown. It is a schematic front view at the time of seeing the package shown in FIG. 10 from the cover material side. It is a schematic external view which shows an example of the horizontal pillow packaging machine which mounts | wears with the laminated body for laser printing of this invention, and forms a package. It is a figure which shows the example which provided the design printing part, such as a character and a pattern, beforehand in the laser printing part of the laminated body for laser printing of this invention. FIG. 14 is a diagram showing an example of laser printing on the laser printing section shown in FIG. 13.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Laminated body for laser printing 2 ... Transparent base film 3 ... White ink layer 4 ... Thermal adhesive resin layer 5 ... Aluminum layer 6 ... Adhesive layer 7 ... Heat Seal layer 8 ... Adhesive layer 9 ... Laser printing part 10 ... Design printing part 11 for characters, designs, etc .... Cutting part 12 ... Printing part 13 for laser ... Opening part 14 .... Heat seal part 15 ... Notch part 16 ... Contents 17 ... Oxygen scavenger 18 ... Plastic container 19 ... Cover material 20 ... Design printing part 30 for characters, designs, etc. ... Horizontal pillow packaging machine 31 ... Laser beam irradiation device 32 ... Printing inspection device 33 ... Dancer roll 34 ... Receivers 35a, 35b ... Quantity feed rollers 36a, 36b ... Heat Sealing device 37 ... former 38 ... discharge container A 100 ... Adhesive label 110 ... Laminated body 120 with laser printing ... Rolled laminated raw material 130 ... Rolled laminated body 140 ... Bag body 150 with laser printing ... Laser Package 160 with print ... Package

Claims (12)

In the laminate for laser printing in which figures and characters are formed by laser light irradiation, a white ink layer containing a titanium oxide pigment is partially provided from the transparent base film on the outer layer side toward the inner layer side, A molten low-density polyethylene resin layer or a molten ethylene / acrylic acid copolymer resin layer is provided on the inner layer side, and an aluminum layer is further provided on the inner layer side, and laser is applied from the outer layer surface side of the transparent substrate film. A laminate for laser printing, wherein a blackened design is formed on the white ink layer when irradiated with light.   The laminate for laser printing according to claim 1, wherein a heat seal layer is provided at least in the innermost layer. The design which blackened the said white ink layer by irradiating the laser beam from the outer-layer surface side of the said transparent base film to the laminated part which has the said white ink layer of the laminated body for laser printing of Claim 2. A laminate with laser printing, characterized in that is formed.   An adhesive layer is provided in at least the innermost layer of the laminate for laser printing according to claim 1, and a blackened design is formed by irradiating the laminated portion having the white ink layer with laser light. An adhesive label characterized by that.   3. The laser printing according to claim 2, wherein the heat seal layers of the innermost layer of the laminate for laser printing according to claim 2 are opposed to each other, and an outer periphery other than a portion to be an opening is heat sealed to form a bag shape. Bag body.   The laser-printed laminate according to claim 3, wherein the heat seal layers of the innermost layers are opposed to each other, and the outer periphery other than the portion to be the opening is heat sealed to form a bag shape. Printed bag.   The heat seal layer of the innermost layer of the laminate for laser printing according to claim 2 and the heat seal layer of the second laminate having a heat seal layer are opposed to each other, and the outer periphery other than the portion that becomes the opening is heat sealed. A bag body for laser printing, characterized by being formed into a bag shape.   The heat seal layer of the innermost layer of the laminate with laser printing according to claim 3 and the heat seal layer of the second laminate having a heat seal layer are opposed to each other, and the outer periphery other than the portion serving as the opening is heat sealed. A bag body with laser printing, characterized by being formed into a bag shape.   A packaging body, wherein the contents are stored in the bag body according to any one of claims 5 to 8, and the opening of the bag body is sealed by heat sealing.   The contents are stored in a plastic container capable of heat-sealing the opening, and the opening is opposed to the innermost heat-sealing layer of the laminate with laser printing according to claim 3, A package body, wherein the laminate with laser printing is formed by heat sealing. The laminated portion having the white ink layer of the laminate for laser printing according to claim 1 or 2 is irradiated with laser light from the outer surface side of the transparent base film, and the white ink layer is blackened. A laser printing method, characterized in that a formed design is formed.   The laser printing method according to claim 11, wherein the laser light is YVO 4 laser light.

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