JP6255844B2 - Laminated sachet material for packaging, sachet using the same, and laminating sachet laser printing body for packaging - Google Patents

Description

  The present invention particularly relates to a laminated sachet material that can be printed with a laser for filling and packaging liquid foods and beverages such as liquid seasonings, soups, fruit juice beverages, and the like, a sachet using the same, and a printed image with a laser on them. The present invention relates to a sachet for laser printing packaging.

  Conventionally, in addition to forming patterns such as letters, symbols, and drawings in advance on the surface of packaging containers such as cans, bottles, plastic bottles, packaging bags, and packaging materials for packaging these packages, for example, the year of manufacture A method of printing additional information such as date, manufacturer, product name, expiration date, etc. later with ink is widely known.

Packaging bodies and packaging materials such as packaging containers and packaging bags are used for various purposes, and depending on the purpose and use situation, etc., selection of materials, laminating configuration or so as to meet a wide variety of demands and demands The structure is changed and used as a package. For this reason, the package has a variety of laminated structures depending on the form of the package, the change of the material according to the use situation, and the like.
For such a wide variety of packages, there is a need for a technique that can appropriately and accurately print additional information that needs to be written for each packaging material.

  Packaging bodies such as packaging containers and packaging bags and packaging materials are pre-printed on most of the front and back surfaces, and have less margin than containers such as boxes and cans. It is difficult to secure the display area. On the other hand, when the ink layer is displayed on the outer surface of the packaging bag over the existing print layer, the appearance of the package is impaired, and the ink layer display There is an inconvenience that makes it difficult to read.

  In particular, in the case of a small packaging bag for seasonings such as sauce, soy sauce, and powdered soup (hereinafter referred to as “small bag”), the laminated pouch material for packaging is preferably aluminum foil, paper, etc. Heat seal layer located on one surface of laminated sachet material for packaging that does not contain opaque packaging material is heat-sealed with each other, and at least one heat seal part is required between both heat seal layers. The ink layer for displaying the characters, symbols and the like is interposed, and the binder of the ink layer is made of a material similar to that of the heat seal layer, and the printing area is limited. In particular, in a laminated sachet for packaging which is a limited packaging body with a narrow printing area, additional information is printed accurately and appropriately at any position and clearly, and the laminated sachet material for packaging with improved visibility and There is a need to provide a sachet and printed body using the same.

  In addition, since the small packaging bag is in direct contact with the main food such as a side dish of a lunch box or instant noodles, the pigment contained in the ink layer when the outer surface of the packaging bag is marked with an ink layer. In addition to the fact that the vehicle or the like touches the food, there is a hygienic problem that the fats and oils in the food dissolve the ink components.

  Packaging materials such as packaging containers and packaging bags and packaging materials are printed on the surface of packaging bags or the like by a known printing method, inkjet printer, or laser irradiation as a technique for printing additional information, or a laminated structure of packaging materials. It is already known to print additional information between these layers. When printing a predetermined pattern or fixed information, a printing layer can be formed between the layers by inkjet printing or general-purpose printing methods, but additional information that changes the information may not be set in advance. Appropriately, printing may be blurred due to the dryness of printing, compatibility between the package and ink, contact with the printing surface of the package that moves at high speed, etc. The problem is that it cannot be printed accurately.

  In order to solve the conventional problems, in particular, attention has been paid to printing of additional information by laser irradiation. In such laser printing, on the surface of a plastic molded article or the like formed with a resin composition containing a color former that develops color by laser light, or such a resin composition layer formed on the surface. The laser print image is directly formed, and there is a problem that the print is faded or erased by rubbing the surface of the laser print image.

As a technique for printing with a laser beam, printing on a film by irradiating a YAG laser, a YVO ₄ laser, or the like is known. As a multilayer laminated film for laser printing that can be printed by a laser, a film using a special ink that changes color by laser irradiation as an intermediate layer (coloring layer) is known (Patent Document 1).

  Since such special ink is very expensive, the special ink layer is preliminarily provided only on a portion to be printed on the substrate. However, even in that case, alignment is difficult and the print position cannot be easily changed. In addition, there is a drawback that the printed line is thin and difficult to read.

General inks also change color slightly when irradiated with YAG or YVO ₄ laser. Therefore, it is also known to use such normal ink as an intermediate layer (coloring layer) (Patent Document 2). However, in this method, a printing portion is formed on the intermediate layer by irradiating with a powerful laser beam. In other words, in order to obtain sufficient visibility, the laser power is output until the intermediate layer of the laser-irradiated part is completely evaporated over the entire thickness in the depth direction (direction from one surface of the film to the other surface). Need to increase.

  Accordingly, there is a problem that a hole is formed in the base film by irradiation with a powerful laser beam. In addition, there is a problem that the printing speed is slow because it is necessary to irradiate a powerful laser beam.

JP 2007-55110 A Japanese Patent Laid-Open No. 2007-217048

  The present invention relates to a packaging material having a wide variety of laminated structures, particularly in a packaging pouch material for packaging, which is a limited packaging body having a narrow printing area, and a packaging pouch using the packaging, and additional information at the time of packaging. In order to solve the conventional problems in printing, it is made of an inexpensive material, easy to manufacture, easy to change the printing position, and low output that does not damage the base film By irradiating the laser, it is possible to obtain a print line having an appropriate thickness and easy to read. The additional information is printed appropriately and accurately at any position and clearly, improving the visibility. An object of the present invention is to provide a sachet material, a sachet using the sachet material, and a laser printing body thereof.

  As a result of various studies, the present inventors have found that conventional problems in printing additional information while packaging, in a packaging pouch material for packaging or a packaging pouch for packaging, which is a packaging body with a basic laminated configuration limited. In order to solve this problem, white ink that is easy to obtain and highly versatile, and color ink that uses an inexpensive laser coloring material that develops color using low-power laser light are used, and it is generally applied to packaging and packaging materials. The color ink is used as the printing underlayer of the printing layer, and only the laser coloring ink underlayer that can be printed with a low-power laser beam is formed on the printing layer, and the output from the viewing side is low in this area. By irradiating the laser beam, the colored ink component spreads only on the surface of the printed image area between the base film layer and the printed layer on the viewing side, forming a colored area and coloring Nki underlayer proper and accurate, laser-coloring agent found packaging laminate pouch material capable of forming a clear laser printed images having a suitable thick lines in colored ink components in any position.

  The present invention is a laminated pouch material for packaging comprising a substrate, a printing layer comprising a pattern printing layer and a printing underlayer, and a sealant layer, wherein the pattern printing layer and the printing underlayer serving as a laser printing layer overlap. In the laminated pouch material for packaging having only the region and the region for printing base layer, the layer for printing is a color ink layer that can be printed by laser light containing a color developing material that develops color by irradiation with laser light. A layer comprising an ink composition containing a bismuth compound and further containing one or more compounds selected from metal oxides or composite oxides, or copper compounds or molybdenum compounds, and a laminated pouch for packaging A color-developed area colored by laser light is formed only on the surface of the colored ink printing foundation layer between the base material on the visible side of the material and the colored ink printing foundation layer capable of coloring and printing. This is a laminated sachet material for packaging as a laser printing region, and can achieve the above-mentioned object.

The present invention enables laser printing from the following points in a packaging laminated sachet material and a packaging laminated sachet.
1. A laminated pouch material for packaging comprising a base material, a printing layer comprising a pattern printing layer and a printing underlayer, and a sealant layer, wherein the pattern printing layer and the printing underlayer serving as a racer printing layer overlap with printing In a laminated pouch material for packaging having a region only for an undercoat layer, the undercoat layer for printing is a color ink layer that can be printed with a laser beam containing a coloring material that develops color when irradiated with laser light. A laminated pouch material for packaging in which the region is a laser printing region is preferable because low-power laser printing is possible.
2. It is preferable that the coloring material is a laminated sachet material using a bismuth-based compound because it can be colored and printed by a low-power laser beam.
3. The use of bismuth-based compounds as one or two or more compounds selected from bismuth hydroxide, bismuth oxide, bismuth carbonate and bismuth nitrate makes it possible to produce laminated sachets for packaging using low-power laser light. A clear laser printing is possible and preferable.
4). It is clear that the color-developing ink is made of a metal oxide or composite oxide or one containing two or more compounds selected from the group to form a laminated sachet material for packaging with low-power laser light. Printing is possible and preferable.
5. Using a color ink containing one or more compounds selected from a copper-based compound, a molybdenum-based compound or a group thereof as a laminated sachet material for packaging, particularly low-power laser light This is preferable because it allows color development and clear laser printing.
6). It is preferable to form a packaging sachet using the above-mentioned laminated sachet material for packaging because it can develop a color with a low-power laser beam and enables clear laser printing.
7). By irradiating the packaging pouch material or packaging pouch with YAG or YVO ₄ laser light from the substrate side, the color development area of the colored ink composition spreads to the boundary between the substrate and the printing base layer. A laser-printed image formed and laser-printed with additional information is preferred as a packaging pouch print.

  The laminated sachet material for packaging of the present invention does not need to use a special ink for laser printing, for example, using a white ink generally used as a base for printing a packaging film, A printing underlayer formed as a printable white ink layer containing a coloring material that develops color by laser light is formed in the entire area of the laminated pouch material for packaging, and a necessary pattern printing layer is formed on the printing underlayer. By using a laminated pouch material for packaging in which a laser printing layer is formed with a laminated structure laminated on the substrate side, an area of only the printing base layer can be provided at an arbitrary position, and the area is irradiated with laser. It can be a laser printing area.

  The present invention uses a coloring material, particularly a coloring ink layer containing a bismuth compound, as a white pigment used in a commonly used white ink as a base for printing a package, or further a metal oxide, a composite oxidation As a base layer that can be colored with a low-power laser and can be used as a printing layer for laser printing of additional information. A sachet for packaging can be manufactured from an inexpensive material that can function as an underlayer for the printed layer.

By irradiating the laminated pouch material for packaging of the present invention with a YAG or YVO ₄ laser from the substrate side, the coloring ink component containing the coloring material for forming the printed layer is colored by the low-power laser irradiation and partially Since it carbonizes and spreads at the boundary between the base material and the printing underlayer, it has a weak output, that is, it is not necessary to increase the laser output until the printing layer has completely evaporated, and the white ink base as the base By virtue of this contrast, a laser-printed image having excellent visibility from the substrate side can be clearly formed.

  Further, in the printed body of the present invention, the laser-printed image is applied not inside the film surface but inside, that is, between the substrate and the printing layer. Therefore, since this image has excellent wear resistance, it is possible to effectively prevent disappearance due to rubbing or the like, and to prevent change of the additional information.

  Because of these advantages, according to the laminated sachet material for packaging of the present invention and the packaging sachet using the same, additional information can be formed in an area other than the heat-sealed portion of the sachet. Variable information such as date, manufacturer, product name, expiration date, and production location can be read more easily than a conventional inkjet printer, and a large amount of information can be printed as a laser-printed image.

Printing can be performed without bringing ink into contact with the surface of the laminated sachet material for liquid packaging because the laser coloring ink layer at least the inner layer other than the layer in contact with the contents of the packaging sachet becomes a printable layer that can be printed by laser beam irradiation. In addition, a product excellent in hygiene can be obtained without dissolving the ink printed with the oil and fat derived from the contents of the laminated sachet material for packaging.
Further, in the manufacturing process of the laminated sachet material for packaging, only the same printing process as the normal printing process is performed, and it is not necessary to provide a further layer for laser printing, and the manufacturing process can be simplified.

It is a schematic sectional drawing which shows the example about the laminated constitution of the laminated pouch material for packaging of this invention. FIG. 2 is a schematic cross-sectional view showing an example of a layer structure of a printed body using the laminated sachet material for packaging according to the present invention shown in FIG. 1 of the present invention and irradiating this with a laser beam to form a laser printed image. .

The layered sachet material for packaging according to the present invention, the packaging sachet using the same, and the layer structure of the printed body will be exemplified and described in detail below with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an example of the layer structure of the laminated pouch material for packaging according to the present invention.
As shown in FIG. 1, the laminated pouch material for packaging according to the present invention is basically configured to include a substrate 1, a pattern printing layer, a printing layer 2 composed of a printing foundation layer, and a sealant layer 3.

  In another embodiment, as shown in FIG. 2, if the pattern printing layer is a pattern printing layer made of the same or different ink and excellent in adhesion to the substrate, two or more layers are laminated. It may be the configuration.

As shown in FIG. 3, the printed body of the present invention is produced by irradiating the laminated pouch material for packaging of the present invention with a YAG or YVO ₄ laser from the substrate side. On the surface of the ink cartridge has a print portion in which the carbonized ink component spreads.

(Base material)
In the present invention, the substrate is a resin film according to the purpose of use, application, etc., and when the printing layer is laminated, the lamination strength with the printing base layer is higher than the lamination strength with the pattern printing layer. Any resin film that is somewhat smaller can be used.

  Specifically, it becomes a basic material, and further, after printing, it constitutes a surface protective layer and can be seen through a laser-printed image, etc., so it is excellent in mechanical, physical, chemical, etc. A resin film having strength, excellent puncture resistance, and the like, and excellent heat resistance, moisture resistance, transparency, and the like can be used.

  In the present invention, examples of such resin films include various resin films such as polyolefin resins such as polyethylene resins and polypropylene resins, cyclic polyolefin resins, fluororesins, polystyrene resins, polyester resins, polyamide resins, and cellulose resins. You can choose.

  In addition, at the time of film formation using one or more of the above-mentioned various resins, for example, film processability, heat resistance, weather resistance, mechanical properties, dimensional stability, antioxidant properties, slipperiness, release properties, etc. Various plastic compounding agents and additives can be added for the purpose of improving and modifying moldability, flame retardancy, antibacterial properties, electrical properties, strength, laminate strength, etc. Can be arbitrarily added from a very small amount to several tens of percent depending on the purpose.

  In the above, as a general additive, for example, a lubricant, a crosslinking agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a filler, a reinforcing agent, an antistatic agent, a pigment, and the like can be used. Furthermore, a modifying resin or the like can also be used.

  In order to adjust the laminate strength and adhesion between the laser color ink layer and the substrate, any surface can be subjected to a desired surface treatment before lamination as required. As the surface treatment, for example, pretreatment such as corona discharge treatment, ozone treatment, low temperature plasma treatment using oxygen gas or nitrogen gas, glow discharge treatment, oxidation treatment using chemicals or the like can be performed. .

Moreover, you may provide a primer coating agent layer, an undercoat agent layer, an anchor coating agent layer etc. between a printing foundation layer and a base material, for example.
As the resin film, any of an unstretched film or a stretched film stretched in a uniaxial direction or a biaxial direction can be used.

  In the present invention, as the various resin films, for example, one or more of the various resins described above are used, and film forming methods such as an extrusion method, a cast molding method, a T-die method, a cutting method, and an inflation method are used. Using various methods, the above-mentioned various resins can be formed into a single film, or two or more types of resins can be used and mixed before forming into a film to form a film of various resins. Further, for example, any of a stretched film stretched in a uniaxial direction or a biaxial direction using a tenter method, a tubular method, or the like can be used.

In the present invention, the thickness of the resin film may be a thickness that can be kept to the minimum necessary for strength, puncture resistance, and the like. On the other hand, if it is too thin, the strength, puncture resistance and the like are reduced, which is not preferable.
In the present invention, 5 to 100 μm, preferably 10 to 50 μm is most desirable for the reasons described above.

  In the present invention, as the resin film forming the substrate, a stretched polyamide film, polyethylene terephthalate (PET), and those obtained by forming a transparent vapor deposition layer on these substrates can be particularly preferably used. The stretched polyamide film is excellent in terms of stability, processability, cost, heat resistance, chemical resistance, etc., particularly in applications as packaging materials, and is a printing ink that is suitably used as a printing layer described below. When laminating, a preferable laminate strength with the printed layer can be obtained.

(Print layer)
In the present invention, the printing layer includes at least a printing foundation layer composed of a pattern printing layer and a laser-colored white ink layer, and is laminated with a commonly used color ink and laser-colored ink on a substrate by printing or coating. It is a layer provided in this way.
In the present invention, the pattern print layer is formed by printing a desired print pattern such as a character, a figure, a symbol, a pattern, and a pattern on a base material using a general printing method.

  On the other hand, the laser coloring ink layer, which is the printing underlayer of the present invention, functions as a laser printing portion that can be colored and printed by laser light, and the laser coloring ink layer is colored by low-power laser light. A coloring ink containing a pigment component containing at least a coloring material is preferably used, and an inorganic compound is used for the pigment component. Preferably, the constituent pigment component includes an inorganic compound such as a white pigment. The printing underlayer can also obtain a clear printed image by further providing a printing underlayer on the laser coloring ink layer and multilayering the printing underlayer.

  As the coloring material that develops color by laser light used in the present invention, a conventionally known coloring material can be used as the coloring material. Specifically, colorants such as dyes and pigments, clays, and the like can be used. Specifically, yellow iron oxide, inorganic lead compounds, manganese violet, cobalt violet, mercury, cobalt, copper, nickel, etc. Metallic compounds, nacreous pigments, silicon compounds, mica, kaolins, silica sand, diatomaceous earth, talc, titanium oxide coated mica, tin dioxide coated mica, antimony coated mica, tin + antimony coated mica, tin One type or two or more types such as + antimony + titanium oxide-coated mica can be used.

In the present invention, at least a bismuth compound is particularly used as a coloring material that develops color with a low-power laser. Specific examples of the bismuth compound include, but are not particularly limited to, for example, bismuth nitrates such as bismuth oxide, bismuth nitrate, and bismuth oxynitrate, bismuth halides such as bismuth chloride, bismuth oxychloride, bismuth sulfate, and bismuth acetate. Bismuth citrate, bismuth hydroxide, bismuth titanate and the like are mentioned. Among them, bismuth nitrate and bismuth hydroxide are preferable from the viewpoint of easy availability and low cost. As a bismuth-type compound, 1 type, or 2 or more types of compounds can be included. In the present invention, a coloring material containing at least a bismuth compound is used, and other coloring materials than bismuth compounds can be used in combination as long as the coloring material is colored by laser light.

  In the present invention, a coloring material containing at least a bismuth-based compound is used, and a coloring material that develops color with laser light and / or an inorganic compound can be used to increase coloring efficiency. It is possible to use a metal oxide, a composite oxide, a metal salt, or one or more compounds thereof as the inorganic compound, and even if there is an inorganic compound even when irradiated with low-power laser light, Add inorganic compounds to function and / or to increase the whiteness of the white ink containing the coloring material and white pigment by helping the coloring of the coloring material by functioning and increasing the heat generation efficiency of the inorganic compound It is preferable.

  In the present invention, it is possible to use a pigment used in white ink that is generally used as a general-purpose printing foundation layer in printing. Preferably, the metal oxide can contain one or more of titanium oxide, magnesium oxide, zinc oxide, aluminum oxide, silicon oxide, nickel oxide, tin oxide, neodymium oxide, mica, zeolite, kaolinite and the like. .

  In the present invention, not limited to metal oxides, copper compounds, molybdenum compounds, copper / molybdenum composite oxides, copper / tungsten compounds, metal salts, and the like can also be suitably used because they also function as coloring materials. .

  As the copper-based compound, for example, copper, copper oxide, copper halide, formic acid, citric acid, salicylic acid, lauric acid, oxalic acid, maleic acid and other organic acid copper, copper phosphate, hydroxyphosphate copper and the like are suitable. Can be used.

  As the molybdenum-based compound, molybdenum, molybdenum dioxide, molybdenum trioxide, molybdenum chloride, and metal molybdate (metals: K, Zn, Ca, Ni, bismuth, Mg, and the like) can be preferably used.

  As the metal salt, a salt of an acid such as sulfuric acid, nitric acid, oxalic acid, or carbonic acid with a metal such as barium, cobalt, magnesium, nickel, or iron can be used.

  In the present invention, in particular, a laser coloring ink that contains at least a bismuth-based compound as a coloring material and that contains titanium oxide as a white pigment is preferably used.

  The bismuth compound color-developing material that develops color with a low-power laser beam is contained in the range of 0.1 to 95.0% by weight in terms of solid content with respect to the ink composition. In the present invention, the content of the coloring material is preferably 1 to 30% by weight. If it is less than 1% by weight, it is not preferable because the color development, printing is insufficient, and the image becomes unclear, and as the content increases, the color development of the print becomes deeper. The difference in the visibility due to the color is not recognizable, but rather the cost increases, the printing underlayer becomes hard, cracks, and the strength decreases, and the pigment color of the coloring material itself that develops color when irradiated with laser light is the printing underlayer It is not preferable because of coloring it.

  The content of the inorganic compound including the color developing material that develops color with a low-power laser beam is 1 to 99% by weight in terms of solid content of the inorganic compound. As the content increases, the color of the print becomes darker, but the content is preferably 5 to 65% by weight. If it is less than 5% by weight, color development, printing is insufficient and unclear, and if it exceeds 65% by weight, it is not preferable because of an increase in inorganic compounds, resulting in increased costs, brittle printing underlayer, and reduced strength. .

  The laser coloring ink layer preferably has a film thickness of 0.05 to 20 μm, more preferably about 0.1 to 7 μm. When the film thickness is 1 μm or less and less than 0.05 μm, coloring and printing by a coloring material that develops color by irradiation with a laser beam may be insufficient and unclear. On the other hand, as the film thickness increases, the color of the print becomes deeper. However, when the film thickness exceeds 20 μm, the color and the color of the color-developing material that develops color by laser irradiation are sufficient, but a large amount of color-developing material is used. For this reason, it is not preferable for the reasons such as cost increase to reduce the strength of the printing base layer, and the pigment color of the coloring material itself that develops color by laser beam irradiation to color the laser coloring ink layer. When the amount of pigment used is the same, the visibility of printing is slightly improved when the additive concentration is higher and the film thickness is thinner.

  A printing layer can be formed by diluting the coloring ink of the laser coloring ink layer of the present invention with a conventional solvent, if necessary, and printing or coating on a heat-shrinkable substrate. When there are many metal oxides as a coloring ink component, the film is easily damaged by laser irradiation. Conversely, if the amount of metal oxide is small, the printed image tends to be unclear.

  In the present invention, when a print image is formed on the laser color ink layer, a colored undercoat layer can be further provided on the laser color ink layer for the purpose of improving the visibility of the image. In this case, colors with greatly different contrasts can be arranged, and the back of the image can be shielded, so that the visibility of the printed image is always ensured regardless of the color, transparency, and lighting condition of the package. Can do.

  As the colored under layer, the color and color of the pigment can be arbitrarily selected so that the print can be clearly seen by the color that develops when the laser color ink layer is irradiated with laser light, the color of the color layer itself by laser light, etc. . For example, when the laser coloring ink layer is highly transparent gray, the laser coloring is black, and the content is black, high visibility can be obtained by selecting a white colorant.

  For example, basic lead carbonate, basic lead sulfate, basic lead silicate, zinc white, zinc sulfide, lithopone, antimony trioxide, anatase-type titanium oxide, rutile-type titanium oxide, calcium carbonate, One type or two or more types of white pigments such as zinc oxide and barium sulfate can be used.

  The colored base layer preferably has a thickness of 0.05 to 20 μm, more preferably 0.1 to 7 μm. When the film thickness is less than 0.05 μm, coloring is insufficient and visibility is also insufficient. On the other hand, as the film thickness increases, the color of the print becomes darker and the visibility is improved. However, if the film thickness exceeds 20 μm, it is not preferable for reasons such as an increase in cost and a decrease in strength of the colored base layer. In addition, when the content of the coloring component with respect to the entire colored base layer is the same, the concentration of coloring and the visibility of printing are improved by decreasing the additive concentration and increasing the film thickness.

  Specific examples of the binder resin constituting the ink include urethane resin, polyester resin, acrylic resin, and cellulose resin. These resins are used alone or in combination of two or more. In particular, a urethane resin is preferably used as the binder resin in the white ink used as the printing base layer. When the binder resin is laminated on the above-mentioned base material, it gives a preferable laminate strength with the base material, and the component of the color ink is appropriate between the base layer for printing and the base material in printing by laser light. It spreads and can be recognized as characters.

  As long as the laser coloring ink of the present invention contains a laser coloring agent, any metal oxide white ink conventionally used as a printing base can be suitably used. Such a laser coloring ink is diluted with a conventional solvent as necessary, and printed or coated on a substrate to form a printing underlayer. When the laser coloring ink contains a large amount of metal oxide, the film is easily damaged by laser irradiation. Conversely, if the amount of metal oxide is small, the printed image tends to be unclear.

  In order to adjust the laminate strength between the substrate and the printing layer to a desired range, an optional additive may be added to the ink as necessary. Examples of this include addition of a lubricant, an antiblocking agent, a filler, a curing agent, and the like. In addition, various additives such as pigment dispersants, antifoaming agents, leveling agents, waxes, silane coupling agents, preservatives, antioxidants, UV absorbers, rust inhibitors, plasticizers, flame retardants, color developers, etc. It can also be added. These additives are used particularly for the purpose of improving printability, printing effect, and the like, and the type and amount used can be appropriately selected depending on the printing method, printing substrate, and printing conditions.

In addition, the laminate strength may be adjusted by performing a surface treatment such as corona treatment on the laminated surface of the base material, or by laminating a printing layer on an untreated surface.
In the present invention, in order to obtain a laminated sachet material for packaging that is clear by laser light and does not cause printing unevenness, the coating amount of the ink for the printing base layer is 1.5 to 4.5 g / m ² as the coating amount after drying, More preferably, it is 2.7 to 3.3 g / m ² . If the printing layer is thicker than this, the film is easily damaged by laser irradiation. Conversely, if it is thinner than this, the printed image tends to be unclear.

  In addition, in order to obtain the laminate strength defined in the present invention between the substrate and the printing layer (the pattern printing layer and the printing foundation layer), the pattern printing layer or the printing foundation layer can be a multilayer. However, it is possible to more reliably obtain the strength specified by the one-layer printing layer.

  In addition to printing by a known method such as gravure roll coating, reverse roll coating method, knife coating method, kiss coating method, etc., the method of laminating the printing layer can use methods such as inkjet, immersion, spin coating, In the present invention, a method of laminating by printing is preferable. If a printing machine capable of winding a film after printing is used in a printing system in which white ink is present, any of gravure printing, offset printing, letterpress printing, and flexographic printing may be used. In particular, the production process can be simplified by solid printing on the entire surface or part of the printing substrate. The gravure can be easily applied in large quantities, and solid printing can be performed on the entire surface or part of the printing base, thereby improving the concealment and simplifying the manufacturing process. The printing method is suitable.

In the present invention, in order to obtain a laminated sachet material for packaging that is clear and does not cause printing unevenness by laser light, the coating amount of the ink is 1.5 to 4.5 g / m ² as the coating amount after drying. Is suitable.

(Sealant layer)
In the present invention, the sealant layer is a coating layer made of a thermoplastic resin commonly used as the sealant layer, or a layer made of a film or sheet of the resin.

  The sealant layer is a heat-sealable resin layer, and is a heat-sealable resin. Specifically, a resin that can be melted by heat and fused to each other can be used. High density polyethylene, high density polyethylene, linear (linear) low density polyethylene polymerized using metallocene catalyst, ethylene-α-olefin copolymer polymerized using metallocene catalyst, polypropylene, ethylene-acetic acid Vinyl copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methyl Polyolefins such as pentene polymer, polybutene polymer, polyethylene or polypropylene Acid-modified polyolefin resins, polyvinyl acetate resins, poly (meth) acrylic resins obtained by modifying acrylic resins with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, and itaconic acid Resins such as resins, polyvinyl chloride resins and others can be used alone or in admixture of two or more.

  Among the heat-sealable resins that make up the above sealant layer, those in which linear (linear) low-density polyethylene is polymerized using a single site catalyst such as a metallocene catalyst have a narrow molecular weight distribution and are copolymerized. Since the ratio is also stable, it has excellent heat resistance, content resistance, stress cracking resistance, low-temperature heat sealability, and hot sealability. The laminated sachet material for liquid packaging of the present invention It can be suitably used for the sealant layer.

  In addition to the above-mentioned linear (linear) low density polyethylene, the heat seal resin layer includes CPP (unstretched polypropylene), LDPE, depending on the contents to be filled, the heat treatment after filling, the distribution conditions, and the like. Select an appropriate film or extruded coating layer such as ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, ionomer, and polyester resin. Can be used.

  Although the lamination | stacking method of a sealant layer is not specifically limited, It can laminate | stack by extrusion-coating the thermoplastic resin which forms a sealant layer on a printing layer. Further, the film made of the thermoplastic resin may be laminated by a dry lamination method or a sandwich lamination method.

  As an adhesive for dry lamination, urethane adhesive, polyester polyurethane adhesive, polyester adhesive, polyether adhesive, vinyl adhesive, acrylic adhesive, epoxy adhesive, and the like can be used. . Further, any thermoplastic resin can be used as the adhesive resin for sandwich lamination.

In the present invention, the sealant layer can be formed by using the heat sealable resin as described above and extruding and laminating by an extrusion laminating method or the like.
In the present invention, the thickness of the sealant layer can be appropriately set according to the contents filled in the laminated pouch material for packaging, but is preferably about 5 to 150 μm, more preferably 20 to 50 μm.

For example, a primer coat layer, an undercoat layer, an anchor coat layer, or the like may be provided between the printing base layer and the sealant layer.
As the anchor coat layer constituting the laminated sachet material for packaging of the present invention, either a solvent type or an aqueous type can be used.

  Therefore, (chlorinated) polypropylene, modified polyolefin, ethyl vinyl alcohol, polyethylene imine, polybutadiene, polyurethane, polyester polyurethane emulsion, polyvinyl chloride emulsion, urethane acrylic emulsion, silicon acrylic emulsion, vinyl acetate acrylic emulsion , Acrylic emulsion, styrene-butadiene copolymer latex, acrylonitrile-butadiene copolymer latex, methyl methacrylate-butadiene copolymer latex, chloroprene latex, polybutadiene latex rubber latex, polyacrylate latex, polyacrylate Vinylidene chloride latex, polybutadiene latex, or carboxyl of these latexes Water or water-soluble substances, such as polyvinyl alcohol, water-soluble ethylene-vinyl acetate copolymer, polyethylene oxide, aqueous acrylic resin, aqueous apoxy resin, aqueous cellulose derivative, aqueous polyester, aqueous lignin derivative, etc. A dispersion type emulsion or a dispersion anchor coating agent is used. For example, when the outermost layer is a polyethylene-based melt-extruded resin layer, a polyethylene-based or modified polyolefin-based emulsion or dispersion is preferable in consideration of adhesiveness to the substrate.

In the use of packaging materials, the sealant layer is the innermost layer in contact with the contents, and therefore, polyolefin resins such as polyethylene and polypropylene are preferably used.
In the present invention, for example, as a barrier layer, a vapor deposition film of an inorganic oxide on a stretched base film layer, and a barrier of vinylidene chloride resin or ethylene vinyl alcohol copolymer resin on the stretched base film 2 A functional resin coating film can be used.

As the inorganic oxide vapor-deposited film, any transparent thin film obtained by making a metal oxide amorphous can be used. For example, silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), boron (B), titanium (Ti), zirconium (Zr), yttrium (Y A transparent thin film in which a metal oxide such as) is made amorphous (amorphous) can be used.
Examples of suitable materials for packaging materials include thin films obtained by making metal oxides such as silicon (Si) and aluminum (Al) amorphous.

(Printing with laser light)
In the present invention, printing is performed using a YAG (yttrium (Y), aluminum (A), garnet (G)) laser beam (wavelength = 1.064 μm) or a YVO ₄ (yttrium vanadate) laser beam (wavelength = 1.64 μm). It is preferable to perform using. These lasers have the property of transmitting through a transparent body, and by utilizing this property, the generation of smoke and the like during printing can be suppressed, and the color density and the effect on the film can be adjusted. . As a result, it is possible to form a very clear laser-printed image having no holes or the like even when a laser-printed image is formed.

  By irradiating these lasers from the substrate side of the laminated sachet material for packaging, the output of the laminated sachet material for packaging is low output, and the ink component of the printing layer is gasified while minimizing damage to the film. Carbonization is performed to form a gap between the substrate and the printing layer, and a laser printing image can be efficiently formed on the surface of the printing layer.

Then, by forming the laser print image on the surface of the laser coloring ink layer, an image having excellent visibility from the substrate side can be obtained.
In the present invention, the pulse condition for performing such printing is, for example, an average output of 0.8 to 5.0 W, more preferably 1.5 to 3.0 W with a YVO ₄ laser machine (MD-V9600 manufactured by Keyence). The pulse conditions of Q switch frequency 10-30 KHz, scan speed 300-4000 mm / s, more preferably 1500-3000 mm / s are used. By performing printing under these conditions, high-speed printing is possible without making holes in the multilayer laminated film for laser printing, and a clear printed image can be obtained.

(Printed body with laser light)
Even if the average output of the laser is set low or the scan speed is set high in the printing process on the multilayer laminated film for laser printing of the present invention, a clear printed image, for example, a thick and clear character is printed. can do.

  In the printed body of the present invention, the diameter of the gap formed between the substrate and the printed layer by laser spot irradiation is desirably 40 μm to 1 mm, more preferably 400 to 700 μm. A clear printed image can be obtained by spreading the carbonized ink component in the gap and using the white ink of the printing base layer as a background. If the diameter of the air gap is smaller than this, the printed image is lost or the line width is reduced, and visibility is lost. Conversely, if it is larger than this, it is not preferable because the image is crushed.

In the present invention, the laser-printed image includes, but is not limited to, letters, numbers, symbols, patterns, and the like.
The printed body obtained by printing on the laminated sachet material for packaging or the laminated sachet for packaging of the present invention can be suitably applied as the printed sachet of the laminated structure of the present invention.

  In the laminated sachet material for packaging according to the present invention, the printing layer is printed on a region consisting only of white ink that functions as a printing underlayer that can be printed by laser light, and the printing layer is not printed by laser light. The area where the pattern printing layer provided with the desired color printing layer and the printing base part are overlapped has good adhesion to the substrate even in a moist heat atmosphere, has high lamination strength, and peels off as a laminated pouch material for packaging. In combination with the fact that no occurrence occurs, clear prints can be reliably obtained in the print area.

(Multilayer sachets for packaging)
A packaging sachet using the above-described packaging laminated sachet material will be described. A bag-shaped container body made of a packaging sachet uses a laminated material made of the above-mentioned laminated sachet material for packaging, folds the laminated material, and stacks the heat-sealable resin layers facing each other. The package can be manufactured by heat-sealing the end portion to form a cylindrical package, then sealing the bottom to fill the contents, and sealing the top.

  As the bag making method, the laminated material as described above is folded or overlapped so that the inner layer faces each other, and the peripheral end thereof is, for example, a side seal type, a two-side seal type, a three-side seal. Various types of heat seals such as molds, four-sided seals, envelope stickers, pillow seals, pleated seals, flat bottom seals, square bottom seals, gussets, etc. A packaging sachet in the form can be produced. In the above, as a heat sealing method, for example, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal can be used.

  In the present invention, the packaging pouches produced as described above specifically include sauce, syrup, ponzu, soy sauce, dressing, ramen soup, noodle soup, ketchup, tabasco, wasabi, mustard, etc. Liquid foods and drinks such as liquid seasonings, supermarkets, etc. are filled and packaged.

EXAMPLES The present invention will be specifically described below with reference to examples, but these do not limit the present invention.
[Example 1]
On one surface of a biaxially stretched polyamide (nylon) film (base material) having a thickness of 15 μm, a color ink was applied as a pattern layer by a gravure roll coating method. On top of that, a laser coloring ink containing 5% by weight of bismuth oxide (in terms of the solid content of the ink composition) as a coloring material and 15% by weight of titanium dioxide as a white ink pigment was applied to the entire surface by a gravure roll coating method. A color ink printing layer was provided. Next, a linear low density polyethylene film having a thickness of 50 μm was laminated as a sealant layer on the printed layer by a dry laminating method using a two-component curable polyester adhesive. Thus, three types of laminated sachets for packaging having the layer structure of the biaxially stretched polyamide film / picture color ink printing layer / laser color ink layer / adhesive layer / linear low density polyethylene film sealant layer of the present invention. Got.

[Example 2]
On the laser coloring ink layer used in Example 1, linear low density polyethylene was laminated as a sealant layer so as to have a thickness of 70 μm by an extrusion coating method. Prior to this, an anchor coat layer was formed on the laser color ink base layer using a urethane anchor coating agent, and a linear low density polyethylene was laminated thereon as a sealant layer by an extrusion coating method. Thus, a laminated sachet material for packaging having the layer structure of the biaxially stretched polyamide film / image color ink printing layer / laser color ink layer / anchor coat layer / extruded linear low density polyethylene sealant layer of the present invention was obtained. The laminated sachet material for packaging of the present invention was produced in the same manner as Example 1 except for the above.

[Examples 3 and 4]
A laser color ink layer was applied by the gravure roll coating method in the same manner as in Example 1 or 2 using a laser color ink in which 3% by weight of copper / molybdenum composite oxide was further added to the laser color ink in Example 1 or 2. Except for the printing layer, the same as in Example 1 or 2, respectively, biaxially stretched polyamide film of the present invention / picture color ink printing layer / laser coloring ink layer / adhesive layer / linear low density polyethylene film sealant Three types of laminated sachets for packaging having a layer structure, or a layer structure of biaxially stretched polyamide film / picture color ink printing layer / laser color ink layer / anchor coat layer / extruded linear low density polyethylene sealant layer A laminated sachet material for packaging was obtained.

[Comparative Example 1]
Instead of the laser coloring ink in Example 1, CLIOS (urethane-based resin binder) manufactured by DIC Graphics Co. , Ltd. and white ink of Lamic FB701 white (D) (urethane-based resin binder) manufactured by Dainichi Seika Kogyo Co., Ltd. were used. In the same manner as in Example 1, a laminated pouch material for packaging having a layer structure of biaxially stretched polyamide film / picture color ink printing layer / white ink layer / adhesive layer / extruded linear low density polyethylene sealant layer Manufactured.

[Comparative Example 2]
Instead of using laser coloring ink in Example 2, CLIOS (urethane-based resin binder) manufactured by DIC Graphics Corporation and white ink of Lamic FB701 white (D) (urethane-based resin binder) manufactured by Dainichi Seika Kogyo Co., Ltd. were used. , the same procedure as in example 2, a biaxially stretched polyamide film / picture color ink printed layer / white-in key layer / anchor coat layer / extrusion linear low density polyethylene sealant layer laminated packaging pouch material having a layer structure of A laminated sachet material for packaging was produced.

[Laser printing method]
About the laminated pouch material for packaging obtained in Examples 1 to 4 and Comparative Examples 1 and 2, YVO ₄ laser light was irradiated from the base material side under the following conditions to form a laser print image to obtain a printed body. It was.
・ Laser irradiation conditions YVO ₄ laser machine (MD-V9600 manufactured by Keyence Co., Ltd.) For the examples, the average output is 1.6 W, the Q switch frequency is 10 KHz, the scan speed is 3000 mm / s, and the comparative example is the average output is 3.0 W. Q switch frequency 10KHz, scan speed 500mm / s.

(Evaluation method)
Hereinafter, for each of the laminated pouch materials for packaging shown in the Examples and Comparative Examples, by actually irradiating a laser beam, printing is performed on the white ink base layer, and the clarity of the printed characters and the thickness of the printed characters are maintained. The printed characters such as the color density were comprehensively judged, and the visibility was evaluated by a sensory test.

[Evaluation]
In both Examples and Comparative Examples, the printed state of the laser printed image obtained under the above laser irradiation conditions was evaluated by visibility. Moreover, the external appearance after laser irradiation was confirmed.
In the laminated sachets for packaging of Examples 1 to 4, a dark and clear print image with a wide line width was formed by low-power laser irradiation, and laser printing with good visibility was obtained. In particular, the system in which the copper / molybdenum composite oxides of Examples 3 and 4 were added showed a color development superior to the system of the color developing material alone, and the copper / molybdenum composite oxide serves as the color developing material and further functions as a color developing aid. Laser printing with good properties and good visibility was obtained.

  On the other hand, the laminated sachets for packaging of Comparative Examples 1 and 2 show that even if the white ink underlayer is irradiated with laser, the characters are blurred, the outline is not clear and the sharpness is inferior, the thickness of the characters is thin, and the visibility and discrimination No good printing was obtained. In order to obtain the same level of visibility as in the examples, the laser irradiation conditions were set to high energy irradiation, and before the visibility printing was obtained, a hole was opened in the base material of the laminated sachet material for packaging, and for packaging purposes. Appearance deteriorated as a laminated sachet and could not be used.

1. Base material 2. Print layer 2a. Picture printing layer 2b. 2. Print base layer Sealant layer Print section

Claims (7)

A laminated sachet material for packaging comprising a substrate, a printing layer composed of a pattern printing layer and a printing underlayer, and a sealant layer, wherein the area where the pattern printing layer and the printing underlayer serving as a laser printing layer overlap is printed In the laminated sachet material for packaging that has only the base layer for
The printing undercoat layer comprises a chromogenic material which develops a color by the irradiation of the laser beam, the laser beam
Laminated sachet material for packaging, which is a colored ink base layer that can be colored and printed.   The laminated sachet material for packaging according to claim 1, wherein the coloring material is a bismuth-based compound.   The laminated sachet material for packaging according to claim 2, wherein the bismuth-based compound is one or more compounds selected from bismuth hydroxide, bismuth oxide, bismuth carbonate and bismuth nitrate.   The laminated sachet material for packaging according to any one of claims 1 to 3, wherein the color ink contains one or more compounds selected from a metal oxide, a composite oxide, or a group thereof.   The laminated sachet material for packaging according to any one of claims 1 to 3, wherein the color ink contains one or more compounds selected from a copper compound, a molybdenum compound, or a group thereof.   A packaging sachet using the laminated sachet material according to any one of claims 1 to 5. The laminated sachet material for packaging according to any one of claims 1 to 5 or the sachet according to claim 6 of an ink composition colored by irradiating YAG or YVO ₄ laser light from the substrate side. A sachet laser printing body for packaging having a color development area extending at the boundary between the substrate and the undercoat layer for printing and having a laser printing image.

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