JP2006305889A - Marking method to packaging bag and packaging bag with marking - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a marking method to a packaging bag, by which a clear marking can be formed to the packaging bag consisting of a packaging material mainly made of a synthetic resin, and the packaging bag with the marking. <P>SOLUTION: This marking method is applied to the packaging bag consisting of the packaging material 1 made of a laminate formed by laminating a base material film layer 1e, a transparent ink layer 1d and a metallic layer 1c in the order named under the condition that the frontest surface of the packaging material is occupied by the base material film layer 1e. A marking M is formed by traces of the removal of the base material film layer 1e and of the transparent ink layer 1d caused by the irradiation of laser beams L from the base material film layer 1e side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a marking method for a packaging bag capable of forming a clear marking on a packaging bag made of a packaging material mainly composed of a synthetic resin, and a packaging bag with marking.

  Conventionally, packaged foods such as lunch boxes, cup noodles, bag noodles, frozen foods, and the like are sometimes attached with fillings such as sauces, additives, and noodle soup packed in small packaging bags. When marking such as a letter or a picture on a packaging bag of this type, it is common to use a packaging material provided with a marking in advance, or to mark using a thermal printer or an inkjet printer. However, when using pre-marked packaging materials, it is necessary to prepare different packaging materials if the contents of the markings differ even partially. When changing the contents, it was impossible to respond quickly and there was a problem. When marking using a thermal printer or inkjet printer, there is an advantage that the contents of the marking can be easily changed. However, since the ink layer formed by the marking is exposed on the surface of the packaging bag, the packaging bag When in contact with food, there was a hygiene problem and it could not be used.

Patent Document 1 discloses a method in which another part of a film can be continuously run while a part of the film is stopped using a storage means for printing on the film with a printer in a bag making and packaging machine. Is described.
Patent Document 2 discloses that a thin coating of a transparent resin provided on the surface of a base metal is burned out with a laser beam in order to form a marking that is not normally known on the can lid portion of a beverage can. The method of marking is described.
In Patent Document 3, a printed layer provided on the front side of a packaging material having a metal foil is insulated with an underprint layer and heated with a laser beam to form white characters by melting, fluidizing or sublimating the printed layer. Or a method of forming colored characters by color change due to a chemical reaction.
Patent Document 4 discloses packaging by irradiating the surface of a packaging case made of a paper base material having a colored layer and a resin film layer on the surface, and evaporating the colored layer and the resin film layer with the laser beam. A method for forming a display on a case is described.
According to Patent Document 5, it is desired that the plastic film on the upper layer of the metal foil is thermally changed in such a manner that a visible discoloration occurs or a part of the surface is removed by laser light irradiation. A method of forming a print is described.
JP-A-10-181721 JP 2003-12736 A JP-A-11-152117 Japanese Patent Laying-Open No. 2005-8201 JP-T-2002-521233

However, the method described in Patent Document 1 is printing by a printer, and since the ink layer is exposed on the surface of the packaging bag as described above, it is used for sanitary problems when the packaging bag is in contact with food. Can not do it.
The method described in Japanese Patent Laid-Open No. 2004-228561 is intended to print such that its existence is not known, and is not applicable to packaging bags that require clear characters, patterns, and the like.
The method described in Patent Document 3 is applied to a lid material for PTP packaging and the like, and is applied to a packaging material having no base film layer. And a white character is formed, without removing a printing layer and the overcoat layer provided on it. Therefore, in order for the laser irradiation to bring about a sufficient change in printing on the printed layer, it is necessary not to provide an overcoat layer or to make its thickness extremely thin, 0.5-2 μm. Not applicable.
In the method described in Patent Document 4, as described in paragraph 0017 of the specification, the case is prevented from being deformed by laser irradiation by using a paper base material. Moreover, it does not have a metal layer. Therefore, when it is applied to a packaging bag made of a material mainly composed of synthetic resin, there is a possibility that deformation or perforation (pinhole) of the synthetic resin may occur due to heat generated by laser irradiation.
The method described in Patent Document 5 simply marks a plastic film bonded to a metal foil with a laser, and depending on the material and thickness of the plastic film, printing may be unclear with a short laser irradiation. There is.

  The present invention has been made in view of the above circumstances, and provides a marking method for a packaging bag and a packaging bag with markings capable of forming a clear marking on a packaging bag made of a synthetic resin-based packaging material. The issue is to provide.

In order to solve the above problems, the present invention provides a packaging bag comprising a packaging material having a base film layer, a transparent ink layer, and a metal layer in this order so that the base film layer is the outermost surface. A marking method, wherein the base film layer and the transparent ink layer are removed by laser light irradiation from the base film layer side, and marking is formed by the removal marks. Provide a marking method.
The transparent ink constituting the transparent ink layer preferably does not contain an inorganic colorant. The transparent ink preferably contains a colorant composed of one or more of an organic colorant and a carbon colorant.
The irradiation with the laser light is preferably performed after the packaging material or the packaging bag is set in the filling machine and before the packaging material or the packaging bag is filled with the contents in the filling machine.
The irradiation with the laser beam can be performed on a planned sealing portion and / or a sealing portion of the packaging material.

Further, the present invention is a packaging bag made of a packaging material having a laminate comprising a base film layer, a transparent ink layer, and a metal layer in this order so that the base film layer is the outermost surface. Provided is a packaging bag with markings, which has a marking formed by removing the base film layer and the transparent ink layer by irradiation with laser light from the side of the material film layer.
The transparent ink constituting the transparent ink layer preferably does not contain an inorganic colorant. The transparent ink preferably contains a colorant composed of one or more of an organic colorant and a carbon colorant. The marking can be provided on the seal portion.

  According to the present invention, since the marking is formed by removal marks on the surface of the packaging material by laser irradiation, no sanitary problem occurs even when the packaging bag is in contact with food. Since the transparent ink layer is provided inside the base film layer, the transparent ink layer easily absorbs laser light even if the base film layer is difficult to absorb laser light and marking is difficult. Therefore, heating is also promoted from the inside of the base film layer. That is, even when the degree of melting, sublimation or evaporation of the base film layer by laser light irradiation is small, clear marking can be performed by the heat generation of the transparent ink layer. Thereby, even if marking is performed on the seal portion of the packaging bag, it is easy to read. In addition, marking on a filling machine that cannot take a long laser irradiation time is possible. Moreover, since the metal layer is provided under the transparent ink layer, the heat generated by laser light or laser irradiation can be reflected by the metal layer. Therefore, the transparent ink layer is efficiently heated, and sharp marking is possible in a short time. Further, it is possible to prevent problems such as the occurrence of pinholes in the packaging bag due to the laser light and heat reaching the reinforcing layer and the sealant layer. By marking on the filling machine, even when it is necessary to change the display contents, it is possible to quickly respond by using the conventional packaging material, and the packaging material can be made common and rationalized.

  In particular, by setting a packaging material or a packaging bag in a filling machine (for example, a bag making filling machine or a bag feeding and filling machine) and then performing laser irradiation before filling the packaging material or the packaging bag with the contents in the filling machine, Marking can be performed by laser irradiation of a flat packaging material. Therefore, it is easy to control the position of the marking, and it is possible to easily form a marking that is not distorted and easy to identify.

The present invention will be described below with reference to the drawings based on the best mode.
FIG. 1 is a schematic cross-sectional view showing an example of a layer structure of a packaging material used in the present invention.
In the marking method of the present embodiment, a laminate having the sealant layer 1a, the reinforcing layer 1b, the metal layer 1c, the transparent ink layer 1d, and the base film layer 1e in this order is used as the packaging material 1.

The sealant layer 1a is a layer that is used for heat sealing as one outermost surface of the packaging material 1 and is disposed in the innermost layer that is in contact with the contents when the packaging bag is formed. As a material constituting the sealant layer 1a, a polyolefin-based thermoplastic resin such as polyethylene (PE) or unstretched polypropylene (CPP) is generally used.
The reinforcing layer 1b is made of a polyester resin such as polyethylene terephthalate (PET), a polyamide resin such as nylon (Ny), a layer that supplements strength such as polypropylene (PP), or an ethylene-vinyl alcohol copolymer (EVOH) or vinylidene chloride. It is a layer which reinforces functions, such as gas barrier property, which consists of synthetic resins. When reinforcing the strength, a stretched film stretched in a uniaxial direction or a biaxial direction is preferable. Two or more of these film layers may be provided. Alternatively, it may be a polyolefin resin layer such as PP or PE which is coextruded or extrusion laminated. In the present invention, since the sealant layer 1a and the reinforcing layer 1b do not affect the marking by the laser beam, the kind and thickness can be arbitrarily selected according to the use as in the case of ordinary packaging materials. You can choose.

  Examples of the method of laminating the sealant layer 1a and the reinforcing layer 1b include a dry laminating method, an extrusion laminating method, and a coextrusion method. A layer made of an adhesive or an anchoring agent may be provided between the sealant layer 1a and the reinforcing layer 1b in order to bond them together. As the adhesive, an adhesive generally used in a dry laminating method, such as polyurethane and polyether, can be used, and can be selected according to the use of the packaging material 1. In addition, as the anchor agent, an anchor agent generally used for extrusion laminating methods such as polyurethane-based, polyether-based, alkyl titanate (organotitanium compound) -based can be used, and it is selected according to the use of the packaging material 1 Is possible.

Examples of the metal constituting the metal layer 1c include aluminum (Al), stainless steel (SUS), nickel (Ni), gold (Au), silver (Ag), copper (Cu), iron (Fe), and the like. Although the form of a metal layer is not specifically limited, A metal foil or a vapor deposition film can be illustrated. By providing the metal layer 1c, the packaging material 1 can be provided with gas barrier properties and light shielding properties that block oxygen and water vapor gases.
When the metal layer 1c is a deposited film, for example, a metal is deposited on the reinforcing layer 1b or the transparent ink layer 1d, or another film obtained by depositing a metal on another film (not shown) made of PET or the like. Can be formed by laminating. When laminating the other metal vapor-deposited film, it is preferable to laminate the metal vapor-deposited film so that it becomes the metal layer 1c and the other film becomes the reinforcing layer 1b. In order to laminate the metal layer 1c with the transparent ink layer 1d, the transparent ink layer 1d is back-printed on the base film layer 1e by a known printing method such as gravure printing or offset printing, and adhered to the base film layer 1e. It is preferable to provide an agent layer and adhere to the metal layer 1c. Although there is no limitation in particular as an adhesive agent used for adhesion | attachment of the metal layer 1c, adhesives for various dry laminates, such as a urethane type adhesive agent and an epoxy-type adhesive agent, are mentioned.

The transparent ink layer 1d can be generally formed using an ink in which a colorant such as a vehicle, a pigment, or a dye, an auxiliary agent, and the like are mixed and a medium composed of a transparent resin is blended to make the color tone light. Any medium can be used without particular limitation as long as it exhibits characteristic absorption at the wavelength of the laser light L and is decomposed or evaporated by irradiation with the laser light L. Most of the medium used in ordinary inks can be used, and examples thereof include acrylic resin, polyester, polyvinyl acetate, epoxy resin, polyurethane, and nitrified cotton. These resins are considered to easily absorb laser light because they have polar groups. The colorant is not particularly limited as long as it is removed together with the medium. Among them, organic dyes such as azo, anthraquinone, pyrazolone, stilbene, and indigo; phthalocyanine, dioxazine, quinacridone Organic pigments such as anthraquinone; carbon-based colorants such as carbon black are the same as medium, or absorb laser light more easily than medium, and are easily decomposed, oxidized, and vaporized. It is excellent in visibility and is preferable. From such a point of view, inorganic colorants such as oxides such as titanium oxide and zinc white, silicates such as ultramarine blue, and aluminates such as cobalt blue are not preferable because they remain after laser irradiation. The colorant may be used alone or in combination of two or more.
In the present invention, it is also possible to use a transparent ink which contains only medium and is colorless and transparent without containing a colorant.

  In order to protect the transparent ink layer 1d and prevent scratches and abrasion, the base film layer 1e is provided on the front side (surface opposite to the sealant layer 1a) from the transparent ink layer 1d. Examples of the material constituting the base film layer 1e include a polyester resin such as polyethylene terephthalate (PET), a polyamide resin such as nylon (Ny), and a synthetic resin such as polypropylene (PP). A stretched film stretched in the axial direction is preferred. Two or more of these film layers may be provided, but one layer is preferable from the gist of the present invention. In general packaging materials, a base film having a thickness of about 10 μm to 50 μm is often used.

In order to mark the packaging material 1 described above, in the present invention, at least the base film layer 1e and the transparent ink layer 1d are irradiated in the portion irradiated with the laser light L from the base film layer 1e side. Remove. The removal trace generated by this laser irradiation exhibits an appearance that can be distinguished from the surroundings by the ground color of the metal layer 1c. Therefore, the desired marking M can be formed on the packaging material 1 by irradiating the laser beam L so as to trace characters and pictures.
The laser beam L is not particularly limited as long as it can be used for laser marking, and examples thereof include a carbon dioxide (CO ₂ ) laser, an yttrium aluminum garnet (YAG) laser, and an excimer laser.

  According to such a marking method, since the marking M is formed by the removal mark on the surface of the packaging material 1 by irradiation with the laser beam L, no sanitary problem occurs even when the packaging bag is in contact with food. Moreover, since the metal layer 1c is provided outside the reinforcing layer 1b, the heat generated by the laser light L or laser irradiation can be reflected by the metal layer 1c. Therefore, it is possible to prevent problems such as deformation and perforation of the reinforcing layer 1b due to laser irradiation, and the strength and airtightness of the packaging material 1 are not impaired.

Next, the packaging bag of this invention and its manufacturing method are demonstrated.
2 is a view showing a pillow type packaging bag as an example of the packaging bag of the present invention, and FIG. 3 is a diagram of a bag making and filling machine used for manufacturing the packaging bag of FIG. 2 and filling contents. It is a schematic perspective view which shows an example. A pillow-type packaging bag 6 shown in FIG. 2 has a packaging material 1 having the above-described layer structure formed into a cylindrical shape by a vertical seal portion 3, and a storage chamber 5 for content items is sealed by a pair of upper and lower horizontal seal portions 4, 4. It is a thing.

  The bag making and filling machine 10 shown in FIG. 3 is an apparatus that continuously manufactures the packaging bag 6 and fills the contents from the belt-like and long packaging material 1, and the packaging material 1 is tubular along the longitudinal direction. The sealing plate 11, the filling nozzle (filling means) 12 inserted into the cylindrical packaging material 1, and the side edges 2, 2 of the packaging material 1 are heat-sealed to form the vertical seal portion 3. Horizontal seal means for forming a horizontal seal part 4 by heat-sealing in a transverse direction across a cylindrical packaging material 1 provided with a pair of seal plates 13 and 13 as a vertical seal means to be formed and a vertical seal part 3 Are provided with a pair of seal plates 14, 14, laser light irradiation means 15 for performing marking by irradiating the surface of the packaging material 1 with laser light, and guide rolls 16, 16,... For guiding the packaging material 1.

The molded plate 11 is a plate having a hole-like film passage opening 11a through which the packaging material 1 passes, and the packaging material 1 that has passed through the film passage opening 11a is bent, and the side edges 2 and 2 of the packaging material 1 are formed. Overlapping each other to form a cylinder. When the packaging material 1 is formed into a cylindrical shape, the sealant layer 1a side is the inside.
The filling means 12 is a filling nozzle that supplies contents (not shown) from the tip, and is inserted through the film passage port 11 a of the forming plate 11. The tip of the filling nozzle 12 reaches the cylindrical packaging material 1. In addition, although the upper part of the filling nozzle is omitted in FIG. 3, it is connected to a tank for supplying the contents, a pump for pumping the contents, and the like.
The vertical sealing means 13 sandwiches a portion where the side edge portions 2 and 2 of the cylindrical packaging material 1 are overlapped with each other with a pair of sealing plates, and forms the vertical sealing portion 3 by heat sealing.
The lateral sealing means 14 sandwiches the packaging material 1 in the lateral direction (direction intersecting the longitudinal direction) with a pair of sealing plates, and forms the lateral sealing portion 4 by heat sealing.
The laser light irradiation means 15 is installed toward one of the guide rolls 16 and can irradiate the packaging material 1 before heat sealing supported by the guide rolls 16 with laser light. . The laser beam irradiating means 15 may be placed facing the outer surface side (the base film layer 1e side) of the packaging material 1 so that the marking is formed on the outer surface side of the packaging bag 6. The direction of 15 is not particularly limited, such as vertically upward, vertically downward, laterally, obliquely.

  Hereinafter, a packaging method using the bag making and filling machine 10 will be described. The strip-shaped packaging material 1 guided by the guide rolls 16 and 16 is intermittently conveyed in a predetermined conveyance direction (indicated by an arrow along the packaging material 1 in FIG. 3) by conveyance means such as a feed roller (not shown). Then, marking is performed by the laser beam irradiation means 15. After marking, the packaging material 1 is conveyed vertically downward and passed through the film passage opening 11a of the molding plate 11, the packaging material 1 is curved around the filling nozzle 12, and the side edges 2, 2 are overlapped. Next, the side edges 2 and 2 of the packaging material 1 are heat-sealed by the vertical sealing means 13 and 13. Next, the packaging material 1 formed with the vertical seal portion 3 is heat-sealed in the horizontal direction by the horizontal sealing means 14 and 14. Next, the contents are filled into the cylindrical packaging material 1 by the filling nozzle 12. After filling, the packaging material 1 is further sent downward, and the packaging material 1 is heat-sealed by the lateral sealing means 14 and 14. As a result, a storage chamber 5 is formed in which the contents are sealed between the lateral seal portions 4 and 4 formed at a predetermined distance in the vertical direction. Furthermore, the horizontal sealing part 4 is cut into both sides using a cutting means (not shown) (cutter or the like) to separate individual packaging bags 6.

In the case of this type of bag making and filling machine 10, the conveyance of the packaging material 1 by the conveying means is controlled to stop when the heat sealing is performed by the lateral sealing means 14. Therefore, the marking is performed in synchronization with the conveyance stop. It is desirable to synchronize the timing of laser irradiation so that The marking can be provided on a portion where the seal portions 3 and 4 are formed, or can be formed on a portion where the storage chamber 5 is formed. In particular, according to the present invention, since there is no residue of the inorganic colorant and it is possible to maintain the sharpness, there is a possibility that the surface state may change, such as fine irregularities generated by the seal bar when heat-sealing after printing. Even when printing is performed on a portion where the seal portions 3 and 4 are formed, clear printing can be obtained.
In addition, when marking the contents of the packaging bag where the contents are to be filled, by performing laser irradiation before filling the contents, the position of the marking can be easily controlled, and the marking can be easily formed without distortion. can do. In addition, the laser beam irradiation means 15 can also be installed in the location which irradiates a laser beam on the seal part already formed after filling, as shown with the dashed-two dotted line in FIG.

  The present invention is not limited to the pillow type packaging bag, but can be applied to various other types of packaging bags. FIG. 4 is a diagram showing a three-side sealed packaging bag as another example of the packaging bag of the present invention, and FIG. 5 is a diagram showing a four-side sealed packaging bag as still another example of the packaging bag of the present invention. . FIG. 6 is a schematic perspective view showing an example of a bag making and filling machine used for manufacturing the packaging bag of FIG. 4 and filling the contents.

The three-side sealed packaging bag 7 shown in FIG. 4 is a vertical seal in which the packaging material 1 having the above-described layer structure is folded in two vertically, and the three sides around the content storage chamber 5 are provided on the opposite side of the two-folded portion 7a. It is closed and sealed by the part 3 and a pair of upper and lower horizontal seal parts 4 and 4.
The four-side sealed packaging bag 8 shown in FIG. 5 cuts the packaging material 1 having the above-described layer configuration into two pieces along the vertical direction (or using the two packaging materials 1 and 1 on the front and back sides). The four surroundings of the content storage chamber 5 are closed and sealed by a pair of left and right vertical seal portions 3 and 3 and a pair of upper and lower horizontal seal portions 4 and 4.

  A bag making and filling machine 20 shown in FIG. 6 includes a lead 21 that folds the packaging material 1 in the longitudinal direction, a filling nozzle (filling means) 22 that is inserted into the folded packaging material 1, and Cylindrical packaging material provided with a pair of seal rolls 23 and 23 as vertical sealing means for heat-sealing the side edges 2 and 2 of the packaging material 1 to form the vertical seal 3 and the vertical seal 3 Laser beam irradiation that performs marking by irradiating the surface of the packaging material 1 with laser light and a pair of seal rolls 24 and 24 as horizontal sealing means that heat-seal transversely 1 to form a horizontal seal portion 4 A means 25 and guide rolls 26, 26,... For guiding the packaging material 1 are provided.

The lead 21 has a thin fan-shaped hole 21a. When the packaging material 1 passes through the hole 21a, the packaging material 1 is folded in two along the peripheral edge of the hole 21a, and the side edge portions 2 and 2 are overlapped. When the packaging material 1 is folded in half, the sealant layer 1a side is the inside.
The filling means 22 is a filling nozzle for supplying contents (not shown) from the tip, and is inserted into the hole 21 a of the lead 21. The front end of the filling nozzle 22 reaches the folded packaging material 1. In addition, although the upper part of the filling nozzle is omitted in FIG. 6, it is connected to a tank for supplying the contents, a pump for pumping the contents, and the like.

  Each of the seal rolls 23 and 23 for vertical sealing is formed in a circular shape along the circumferential direction of the roll body 23a on a cylindrical roll body 23a that can rotate along the central axis, and on the outer peripheral surface of the roll body 23a. A convex heat seal member 23b and a position restricting member 23c projecting in a flange shape at the end of the roll body 23a in the length direction. The distance between the two seal rolls 23 and 23 is regulated so that an appropriate sealing pressure can be obtained when the outer peripheral surfaces of the position regulating member 23c are in contact with each other. The packaging material 1 conveyed between the two seal rolls 23, 23 is heated while being sandwiched between the outer peripheral surfaces of the heat seal members 23b of the respective seal rolls 23, 23, whereby the vertical seal portion 3 is formed. Is done.

  Further, each of the sealing rolls 24, 24 for lateral sealing includes a cylindrical roll body 24a that can rotate along the central axis, and a linear shape along the length direction of the roll body 24a on the outer peripheral surface of the roll body 24a. The heat seal members 24b, 24b,... The packaging material 1 conveyed between the two seal rolls 24, 24 is heated while being sandwiched between the outer peripheral surfaces of the heat seal members 24b of the respective seal rolls 24, 24, whereby the horizontal seal portion 4 is formed. Is done. A plurality of heat seal members 24b, 24b,... (Four in this case) are formed at equal intervals along the circumferential direction of the roll body 24a. Thereby, each seal roll 24 and 24 for horizontal sealing can be heat-sealed for every fixed pitch (it substantially corresponds to the height of the packaging bag 7) in the length direction of the packaging material 1. FIG.

  The laser beam irradiation means 25 is installed toward one of the guide rolls 26 and can irradiate the packaging material 1 that is supported by the guide rolls 26 before heat sealing with the laser beam. . The laser beam irradiation means 25 may be placed facing the outer surface side of the packaging material 1 (the base film layer 1e side) so that the marking is formed on the outer surface side of the packaging bag 7. The direction of is not particularly limited, such as vertically upward, vertically downward, laterally, obliquely.

  Hereinafter, a packaging method using the bag making and filling machine 20 will be described. While the belt-shaped packaging material 1 guided by the guide rolls 26 and 26 is conveyed in a predetermined conveyance direction (indicated by an arrow along the packaging material 1 in FIG. 6) by conveyance means such as a feed roller (not shown), the laser. Marking is performed by the light irradiation means 25. After marking, the packaging material 1 is passed vertically downward, passing through the hole 21a of the lead 21, the packaging material 1 is folded in two around the filling nozzle 22, and the side edges 2, 2 are overlapped. Next, the side edges 2, 2 of the packaging material 1 are heat-sealed by the vertical sealing means 23, 23. Next, the packaging material 1 on which the vertical seal portion 3 is formed is heat-sealed in the horizontal direction by the horizontal sealing means 24 and 24. Next, the contents are filled into the cylindrical packaging material 1 by the filling nozzle 22. After filling, the packaging material 1 is further sent downward, and the packaging material 1 is heat-sealed by the lateral sealing means 24 and 24. As a result, a storage chamber 5 is formed in which the contents are sealed between the lateral seal portions 4 and 4 formed at a predetermined distance in the vertical direction. Furthermore, the horizontal sealing part 4 is cut into both sides using a cutting means (cutter or the like) (not shown) to separate individual packaging bags 7.

In the case of this type of bag making and filling machine 20, the vertical sealing seal rolls 23 and 23 and the horizontal sealing seal rolls 24 and 24 are rotated without stopping, and bag making can be performed continuously. In addition, when the packaging material 1 is conveyed at high speed and it is difficult to obtain high-quality markings, it may be converted to intermittent conveyance only while a storage means such as a dancer roll is interposed and laser irradiation is performed. The marking can be provided on a portion where the seal portions 3 and 4 are formed, or can be formed on a portion where the storage chamber 5 is formed. In particular, according to the present invention, since there is no residue of the inorganic colorant and it is possible to maintain the sharpness, there is a possibility that the surface state may change, such as fine irregularities generated by the seal bar when heat-sealing after printing. Even when printing is performed on a portion where the seal portions 3 and 4 are formed, clear printing can be obtained.
In addition, when marking the contents of the packaging bag where the contents are to be filled, by performing laser irradiation before filling the contents, the position of the marking can be easily controlled, and the marking can be easily formed without distortion. can do. In addition, the laser beam irradiation means 25 can also be installed in the location which irradiates a laser beam on a seal part after filling, as shown with the dashed-two dotted line in FIG.
In the bag making and filling machine 20 shown in FIG. 6, a cooling roll for cooling the horizontal seal portion 4 immediately after heat sealing can be provided below the horizontal seal seal rolls 24 and 24. Thereby, while pushing out the contents bitten in the horizontal seal portion 4, the resin of the sealant layer on the horizontal seal portion 4 can be cooled and solidified to improve the heat seal strength.

  When manufacturing the four-side sealed packaging bag 8 shown in FIG. 5, for example, in the vertical seal seal roll 23 of the bag making and filling machine 20 of FIG. 6, the heat seal member is adjusted to the position of the two vertical seal portions 3 and 3. By using an apparatus provided with two right and left 23b, it can be manufactured in the same manner as the three-side sealed packaging bag 7.

FIG. 7 is a view showing a standing pouch as another example of the packaging bag of the present invention, and FIG. 8 is a bag-feeding bag making machine used for filling and sealing the packaging bag of FIG. It is a schematic perspective view which shows an example.
The packaging bag 30 shown in FIG. 7 has a folded bottom member 32 interposed between a pair of body members 31 and 31, and heat seals are provided between both side edges of the body members 31 and 31. Thus, a side edge seal portion 34 is provided, and a bottom seal portion 35 is provided at the lower end portion of each body member 31 and the bottom member 32 by heat sealing. A portion surrounded by the side edge seal portion 34 and the bottom seal portion 35 is a storage chamber 36 filled with contents. Prior to filling the contents, the storage chamber 36 is opened at the opening 33 at the top of the packaging bag 30.

  The bag feeding and filling machine 40 shown in FIG. 8 includes a chuck 41 that holds the packaging bag 30, laser light irradiation means 42 that performs marking by irradiating the surface of the packaging bag 30 held by the chuck 41 with laser light, and packaging. It has a filling nozzle 43 as a filling means for filling the bag 30 with contents, and a sealing means 44 for heat-sealing and sealing the opening 33 of the packaging bag 30. The chuck 41 is intermittently transported along a transport line 45 in a transport direction (left and right direction indicated by an arrow along the transport line 45 in FIG. 8) by a transport unit (not shown). The laser light irradiation means 42 is directed in a direction perpendicular to the paper surface.

In the case of this type of bag feeding and filling machine 40, the conveyance of the packaging bag 30 by the conveying means is controlled to stop at the time of filling or hermetically sealing, so that marking is performed in synchronization with this conveyance stop. It is desirable to match the timing of laser irradiation. The marking can be provided on the seal portions 34, 35, the upper seal portion or the planned seal portion, or can be formed on the storage chamber 36. In particular, according to the present invention, since there is no residue of the inorganic colorant and it is possible to maintain the sharpness, there is a possibility that the surface state may change, such as fine irregularities generated by the seal bar when heat-sealing after printing. Even when printing is performed on a portion where the seal portions 34 and 35 are formed, clear printing can be obtained.
In addition, when marking the storage chamber 36 of the packaging bag 30, by performing laser irradiation before filling the contents, it is easy to control the position of the marking and easily form a marking that is easy to identify without distortion. Can do. In addition, a laser beam irradiation means can also be installed in the location which irradiates a laser beam on the seal part already formed after filling.

As mentioned above, although this invention has been demonstrated based on suitable embodiment, this invention is not limited to the above-mentioned example, Various modifications are possible in the range which does not deviate from the summary of this invention.
The form of the packaging bag is not limited to the packaging bag exemplified in the above description. In addition, the present invention can be applied to various packaging bags such as gusset type packaging bags without any particular limitation.
The packaging bag may have an ink layer other than the transparent ink layer used in the present invention. In that case, both ink layers can be formed simultaneously when the back printing is performed on the base film. However, it is preferable that no other ink layer such as white solid exists in the portion where the transparent ink layer used in the present invention is formed.

  The present invention can be used to provide markings on the outer surfaces of various packaging bags without limiting the industrial field of contents.

It is typical sectional drawing which shows an example of the laminated constitution of the packaging material used by this invention. It is the schematic which shows the pillow type packaging bag which concerns on an example of the packaging bag of this invention, (a) is a top view, (b) is a cross-sectional view which follows the AA line of (a). It is a schematic perspective view which shows an example of the bag making filling machine which manufactures the packaging bag of FIG. It is the schematic which shows the three-way seal packaging bag which concerns on the 2nd example of the packaging bag of this invention, (a) is a top view, (b) is a cross-sectional view which follows the BB line of (a). It is the schematic which shows the four-sided sealing packaging bag which concerns on the 3rd example of the packaging bag of this invention, (a) is a top view, (b) is a cross-sectional view which follows the CC line of (a). It is a schematic perspective view which shows an example of the bag making filling machine which manufactures the packaging bag of FIG. It is the schematic which shows the stunting pouch which concerns on the other example of the packaging bag of this invention, (a) is a top view, (b) is a longitudinal cross-sectional view which follows the DD line | wire of (a). It is a schematic diagram which shows an example of the bag supply filling machine which fills the packaging bag of FIG.

Explanation of symbols

L ... laser light, M ... marking, 1 ... packaging material, 1a ... sealant layer, 1b ... reinforcing layer, 1c ... metal layer, 1d ... transparent ink layer, 1e ... substrate film layer, 6 ... pillow type packaging bag, 7 ... three-side sealed packaging bag, 8 ... four-side sealed packaging bag, 10 ... bag making and filling machine, 15 ... laser light irradiation means, 20 ... bag making filling machine, 25 ... laser light irradiation means, 30 ... standing pouch (packaging bag), 40: Bag supply and filling machine, 42: Laser light irradiation means.

Claims (9)

A laminate comprising a base film layer, a transparent ink layer, and a metal layer in this order, a marking method on a packaging bag made of a packaging material having the base film layer as the outermost surface,
A marking method on a packaging bag, wherein the base film layer and the transparent ink layer are removed by laser light irradiation from the base film layer side, and marking is formed by the removal marks.   The marking method for the packaging bag according to claim 1, wherein the transparent ink constituting the transparent ink layer does not contain an inorganic colorant.   The marking method for a packaging bag according to claim 1 or 2, wherein the transparent ink contains a colorant composed of one or more of an organic colorant and a carbon colorant.   4. The laser light irradiation is performed after the packaging material or the packaging bag is set in a filling machine and before the packaging material or the packaging bag is filled with the contents in the filling machine. The marking method to the packaging bag in any one of.   The marking method for a packaging bag according to any one of claims 1 to 4, wherein the irradiation of the laser beam is performed on a planned sealing portion and / or a sealing portion of the packaging material. A laminate comprising a base material film layer, a transparent ink layer and a metal layer in this order, a packaging bag made of a packaging material so that the base film layer becomes the outermost surface,
A packaging bag with markings, which has a marking formed by removing the base film layer and the transparent ink layer by irradiation of laser light from the base film layer side.   The packaging bag with marking according to claim 6, wherein the transparent ink constituting the transparent ink layer does not contain an inorganic colorant.   The packaging bag with marking according to claim 6 or 7, wherein the transparent ink contains a colorant composed of one or more of an organic colorant and a carbon colorant.   The packaging bag with marking according to any one of claims 6 to 8, wherein the marking is provided on a seal portion.

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