JP2010241471A - Packaging material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging material which enables printing fine variable information or the like, particularly printing a clear two-dimensional code or the like, can prevent the printed variable information or the like from being falsified, and causes no damage to an appearance by solving a printing problem in a conventional inkjet recording method. <P>SOLUTION: In the packaging material formed by laminating a base material layer, an adhesive layer and a heat adhesive resin layer in the order, a variable information printed layer printed by a thermal printer is mounted between the base material layer and the heat adhesive resin layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a packaging material capable of printing variable information including fine characters and figures, and preventing tampering of the printed variable information.

  Paper boxes and paper cups using paper materials, and packaging containers and bags using plastic materials are used as products or product packaging in all fields. Product names and product designs for the packaging materials used for these products are used. A wide variety of displays such as product characteristics and explanation of handling, display of product capacity and raw materials, etc. are applied by printing methods such as offset printing and gravure printing. In general, the display as described above does not change over a long period of time. On the other hand, “variable information”, that is, production date, production lot number, and information that changes every moment, such as the expiration date and the quality retention date when the contents are food, are manufactured separately, for example. Generally, the variable information is printed directly on the outer surface of the packaging material by attaching a label on which the variable information is printed, or by an ink jet printer or the like. Recently, a large amount of information such as product information and campaign information is also notified by a two-dimensional code or the like, and in particular, campaign notification information is generally handled as short-term variable information.

  However, printing by ink jet printing on the surface of packaging materials used in packaging containers and packaging bags using plastic materials is because the adhesion between the plastic materials and the printed ink is not strong, and the ink is not accepted and absorbed. Bleeding or the like occurred, and in particular, fine characters and figures were poorly reproducible. In addition, the display information is faint due to rubbing between the packages, etc., and the display information can be removed, so that the information may be intentionally erased or falsified. It was.

On the other hand, “a plastic film for a packaging bag in which a display mark such as a lot number or a manufacturing date is not rubbed or peeled off by rubbing between packaging bags and the display mark cannot be falsified, and the packaging Providing a packaging bag made of a plastic film for a bag ”has been proposed (for example, Patent Document 1).
In addition, “Providing a printing body, packaging, and printing method capable of pursuing the history of goods even if the display printed by the thermal printer device is intentionally erased, and the display printed by the thermal printer device is intentionally erased. It is proposed to provide a method for pursuing the history of merchandise even if it is made (for example, Patent Document 2).
Furthermore, in the bag-making package product that fills the product while making it into a pillow-type bag and gives a predetermined print item to the film sheet, the print item is printed in advance when giving the print item. By pasting the tape-shaped piece on the back of the film sheet with a heat seal at a predetermined pitch such as the printing pitch, etc. It has been proposed that "there is no change in quality due to the printing ink peeling off inside" (for example, Patent Document 3).

JP 2005-162279 A

JP 2008-238807 A

JP 2003-261104 A

In Patent Document 1, a display mark is printed on the seal surface side of the plastic film at a position corresponding to the heat seal portion after forming the packaging bag, and the display mark is surely sealed on the inner surface side of the seal portion. Because it is in a state of being printed, there is no fading or peeling of the print due to rubbing, and tampering is impossible, but printing by the ink jet recording method can change the address etc. using an ink jet printer in materials that can accept and absorb ink such as paper It is possible to print information, but the ink is not absorbed and absorbed on the film base surface of the packaging bag, so bleeding and the like occur, especially for fine characters and figures that have low reproducibility. . Further, in order to improve the ink reception, it is necessary to previously provide an ink receiving layer on the film surface. Furthermore, since a dedicated drying system is required after printing, it is difficult to print on a film that is easily affected by heat.
Also, in a paper base packaging body, for example, when a resin layer such as polyethylene is provided on one or both sides for improving water resistance or moldability in a paper cup for beverages, etc. When the coating layer for surface gloss is provided, the surface ink receiving ability is low, so it takes time to dry the printed part, or characters and figures are blurred and the reproducibility of printed information is inferior. Etc., which were poor in practicality.

  In Patent Document 2, even if the display printed on the plastic film of the package body using the thermal printer device is intentionally erased, the hidden display is stamped by directly contacting the thermal head with the package body simultaneously with the printing. However, if the printed information consists of a display such as a two-dimensional code, it cannot be read if the print is faint or intentionally erased. In practice, the purchaser could not receive information (for example, campaign announcement information, display information such as a unique number associated with this, information on “win”, “out”, product information, etc.). .

  In Patent Document 3, a tape-like piece to which printing matters such as the date of manufacture are given in advance is pasted on the back side of the film sheet of the packaging bag by heat sealing. Therefore, a process of applying the tape-like piece by heat sealing is required in addition to the heat sealing process of the end of the packaging bag, and the application position shifts or steps due to partial application. For this reason, there is a difference in the degree of rubbing due to rubbing, resulting in a sense of incongruity when viewed from the front side of the packaging bag, impairing designability, position adjustment in the tape-like piece pasting process, and product filling process As a result, there is a problem that it is difficult to maintain high quality stably.

  Therefore, an object of the present invention is to solve the problems of printing by the conventional ink jet recording method, and to print fine variable information and the like, in particular, to make clear printing of two-dimensional codes and the like. Another object of the present invention is to provide a packaging material that can prevent alteration of variable information and the like and that does not impair the appearance.

  In order to solve the above-mentioned problems, the invention of claim 1 is a packaging material in which a base material layer, an adhesive layer, and a heat-adhesive resin layer are laminated in order, between the base material layer and the heat-adhesive resin layer. A variable information printing layer printed by a thermal printer is provided on the packaging material, wherein the variable information printing layer printed by the thermal printer is interposed between the base material layer and the thermal adhesive resin layer. Because it is provided, printing of variable information is not erased or falsified, information can be accurately transmitted to purchasers, etc., and the variable information printing layer is printed by a thermal printer, so an inkjet printer Thus, there is no blurring of characters as in the case of printing by, and finer printing is possible, and since a drying system for drying ink is not required, it can be produced efficiently.

  The invention according to claim 2 is the packaging material according to claim 1, characterized in that the information printed on the variable information printing layer is variable information of vertical 100 dpi or more and horizontal 100 dpi or more. Since large amounts of information can be reproduced, it is possible to provide a large amount of information from the seller to the consumer, and the consumer can improve the reliability and convenience of the product by acquiring information. Become.

  Since the packaging material of the present invention is provided with a variable information printing layer printed by a thermal printer between the base material layer and the heat-adhesive resin layer, it does not require a drying process after printing, and is affected by heat. Printing on various base materials such as easy-to-receive film is possible. Furthermore, since the variable information printing layer is provided between the base material layer and the heat-adhesive resin layer, it is possible to prevent falsification and fouling of information.

  Thermal printers can be used for printing variable information (two-dimensional codes, etc.) that have a particularly large amount of information, and can increase the amount of information transmitted to end users. Production / distribution history information, product characteristic information, etc.) and campaign notification information (recruitment information, information on unique numbers, etc.) can be displayed, and convenience for consumers on handling information (cooking information, etc.) Can be improved.

The expanded sectional view for explanation which shows an example of the lamination composition of the packing material concerning the present invention. The expanded sectional view for explanation which shows other examples of lamination composition of packaging materials similarly. Sectional drawing for description which shows the Example of the packaging bag similarly formed using the packaging material.

  The present invention will be described in detail below with reference to the drawings. FIG. 1 is an explanatory enlarged sectional view showing an example of a laminated structure of a packaging material according to the present invention. FIG. 2 is an explanatory enlarged sectional view showing another example of the laminated structure of the packaging material. FIG. 3 is a cross-sectional view for explaining an embodiment of a packaging bag similarly formed using a packaging material.

  FIG. 1 is an explanatory enlarged sectional view showing an example of a laminated structure of a packaging material according to the present invention. A packaging material S is formed by laminating a base material layer 1, an adhesive layer 2, and a thermal adhesive resin layer 3 in this order from the outside. The laminated structure is such that the printed layer 5 and the variable information printing layer 6 printed by a thermal printer are sequentially provided on the back surface of the substrate layer 1, for example, OPP 20 μm / printing / variable information printing / It is comprised by AC / PE15micrometer / CPP20micrometer. The above laminated structure is an example and does not limit the present invention.

In the packaging material according to the present invention, as a substrate to be printed, that is, a substrate on which printing is possible, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, etc. Polyolefin resin, ethylene-vinyl acetate resin, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, polybutene resin, polymethylpentene resin, polyacrylic resin, polyacrylonitrile resin Synthesis of resin, polyester resin, polyamide resin, polystyrene resin, polyvinyl chloride resin, polyvinylidene chloride resin, saponified ethylene-vinyl acetate copolymer, polycarbonate resin, fluorine resin, vinylon, cellophane, etc. Various resins mainly made of resin It can be Irumu orutilizing sheet.
The film or sheet may be unstretched or stretched in a uniaxial direction or a biaxial direction. The thickness of the film or sheet is arbitrary depending on the problem of individual packaging, but is preferably about 10 to 200 μm.

FIG. 2 is an enlarged sectional view for explanation showing another example of the laminated structure, and the packaging material S ′ is the base material layer 1, the adhesive layer 2, the intermediate layer 4, the adhesive layer 2 ′, and the thermal adhesive resin layer 3 from the outside. Are laminated in order, and the variable information printing layer 6 printed by a thermal printer is provided between the printing layer 5, the intermediate layer 4, and the thermal adhesive resin layer 3 on the back surface of the base material layer 1. For example, PET 12 μm / printing / adhesion / AL 7 μm / variable information printing / adhesion / PEF 30 μm. The above laminated structure is an example and does not limit the present invention.
As shown in FIG. 2, in the present invention, when it is necessary to maintain physical properties such as gas barrier properties in the packaging bag, as the intermediate layer 4, between the base material layer 1 and the heat-adhesive resin layer 3, For example, metal foil such as aluminum foil, polyvinylidene chloride resin film, resin film coated with a composition mainly composed of polyvinylidene chloride resin, stretched polyamide resin film, ethylene-vinyl acetate copolymer Barrier properties can also be imparted by using a film of a combined saponified product, a resin film having a vapor-deposited film of an inorganic oxide such as silicon oxide or aluminum oxide.

The printing layer 5 provided on the base material layer 1 is not necessarily provided, but for the display of contents, decoration, display of the best-before period, display of the manufacturer, seller, etc., other display, characters, designs, Arbitrary printing such as graphics and symbols can be provided on the back surface or the front surface of the base material layer 1. In addition, since the printing layer 5 is protected by the base material layer 1 by providing the printing layer 5 on the back surface of the base material layer 1, ink peeling due to rubbing from the surface or the like can be prevented.
The printing layer 5 can be formed by a normal printing method such as gravure printing or offset printing, flexographic printing, letterpress printing, silk screen printing, or the like using a normal ink composition.

The variable information printing layer 6 is a variable information printing layer printed by a thermal printer. Printing on plastic materials using a thermal printer is excellent in reproducibility of fine characters and figures because there is no bleeding that occurs because the ink is not received and absorbed as in the case of printing using the conventional ink jet recording method. It is not necessary to provide a layer, but to improve the adhesion to the ink on the printing surface, an easy-adhesion layer mainly composed of a resin such as polyester or acrylic is provided, or surface modification treatment by corona discharge, plasma discharge, etc. This can increase the printing speed.
The information printed on the variable information printing layer 6 includes variable information that is required to be displayed on a product such as date of manufacture, date of processing, expiration date, expiration date, etc. There are variable information that makes it possible for the reading terminal to recognize a two-dimensional code that encodes a large amount of information such as distribution history information, product information, campaign notification information and a unique number associated with this, especially a two-dimensional code, etc. Since it is necessary to print in a state without bleeding or the like, it can be provided accurately and with good reproducibility using a thermal printer.

  Examples of the plastic film constituting the heat-adhesive resin layer 3 include polyolefin resins such as low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene. -Vinyl acetate resin, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, polybutene resin, polymethylpentene resin, polyacrylic resin, polyacrylonitrile resin, polyester resin Mainly synthetic resins such as polyamide resin, polystyrene resin, polyvinyl chloride resin, polyvinylidene chloride resin, saponified ethylene-vinyl acetate copolymer, polycarbonate resin, fluorine resin, vinylon, cellophane, etc. Transparency of various resins Ku can be used opaque film or sheet. In addition, in order to be able to read the variable information printed from the packaging material back surface, ie, the thermoadhesive resin layer 3 side, it is necessary to use a transparent thermoadhesive resin.

As a method of bonding the base material layer 1, the intermediate layer 4 and the heat-adhesive resin layer 3, a dry lamination method in which layers are laminated through an adhesive for dry lamination, or an extrusion lamination in which layers are laminated through a melt-extrusion adhesive resin. This can be done by law.
Examples of the adhesive for dry laminating include, for example, one-part or two-part curable or non-curable vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, rubber type, Other solvent-type, aqueous-type, or emulsion-type adhesives can be used. Examples of the coating method include direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method. It can be applied by the Fonten method, transfer roll coating method, or other methods.
Examples of the melt-extrusion resin include a low density polyethylene resin, a medium density polyethylene resin, a high density polyethylene resin, a linear low density polyethylene resin, and a copolymer resin of ethylene / α-olefin polymerized using a metallocene catalyst. , Ethylene / polypropylene copolymer resin, ethylene / vinyl acetate copolymer resin, ethylene / acrylic acid copolymer resin, ethylene / ethyl acrylate copolymer resin, ethylene / methacrylic acid copolymer resin, ethylene / methacrylic acid Graft polymerization or copolymerization of unsaturated carboxylic acid, unsaturated carboxylic acid, unsaturated carboxylic acid anhydride, ester monomer to methyl copolymer resin, ethylene / maleic acid copolymer resin, ionomer resin, polyolefin resin Grafted maleic anhydride to polyolefin resin The resin or the like can be used.

FIG. 3 is an explanatory cross-sectional view showing an example of a packaging bag formed using the packaging material having the above-described laminated configuration. The packaging bag P manufactured using the packaging material S according to the present invention is a packaging material S. Pillow type bag (center-gap seal type) in which the opposite end edges of each other are overlapped and thermally bonded to form a back seal portion, and the formed cylindrical ends are overlapped to form an end seal portion. After forming the printing layer 5 on the back surface of the base material layer 1 using a normal ink composition, the variable information printing layer 6 is printed using a thermal printer device, and then the printing layer 5 The heat-adhesive resin layer 3 is laminated on the variable information print layer 6 via the adhesive layer 2, and the variable information print layer 6 is protected by the heat-adhesive resin layer 3.
In addition, the above is an example of a packaging bag formed using the packaging material according to the present invention, and is not limited to this, and using the packaging material according to the present invention, the packaging material edge as described above. It is possible to produce various packaging bags by folding the inner layer surfaces facing each other, or by overlapping the edges of the packaging material, and further heat-sealing the peripheral edge of the outer periphery of the packaging material.

  Moreover, what is formed using the packaging material which concerns on this invention is not limited to the said packaging bag, For example, the label used for a cover material, a housing, a can or the above-mentioned bag body, unit goods It can also be used for a band or an outer package of an integrated product.

  As mentioned above, it is possible to obtain information that is required to be displayed and displayed among variable information, campaign information and the unique number associated with it, and specific to the purchaser such as “win” or “out” There is information that should be, and it is determined as appropriate in which position in the laminated structure of the packaging material S.

P Packaging bag S, S 'Packaging material Q Contents 1 Base film layer 2, 2' Adhesive layer 3 Thermal adhesive resin layer 4 Intermediate layer 5 Print layer 6 Variable information printing layer

Claims (2)

A packaging material in which a base material layer, an adhesive layer, and a thermal adhesive resin layer are laminated in order, and a variable information printing layer printed by a thermal printer is provided between the base material layer and the thermal adhesive resin layer. A packaging material characterized by that. The packaging material according to claim 1, wherein the information printed on the variable information printing layer is variable information of vertical 100 dpi or more and horizontal 100 dpi or more.

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