JP2005186507A - Laminated sheet for liquid small bag, liquid small bag using it, and method for producing liquid small bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated sheet for a liquid small bag which makes a region other than the heat seal part of the liquid small bag applicable to printing, is read easily, makes a large amount of information printable, prevents the dissolution of ink used in printing in a fats and oils component from the contents of a packaging bag, is excellent in hygienic properties, can prevent the forgery of a printed display, and is excellent in high speed packing aptitude such as high speed sealing properties, the liquid small bag using the sheet, and a method for producing a liquid small bag package. <P>SOLUTION: In the laminated sheet for the liquid small bag, an oriented film which is a substrate film layer and a multi-layer laminated resin layer by T-die coextrusion are laminated through an anchor coat agent layer. At least one layer other than a layer which contacts the contents out of the multi-layer laminated resin layer is made of a resin containing a coloring agent coloring by being irradiated with laser beams. Variable information is made printable by being irradiated with laser beams from the surface of the laminated sheet. The liquid small bag uses the laminated sheet. The liquid small bag package is produced by the method. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention particularly relates to a laminated sheet for liquid sachets for filling and packaging liquid foods and beverages such as liquid seasonings, soups, fruit juices, etc., liquid sachets using the same, and production of liquid sachet packages Regarding the method.
More specifically, a laminated sheet for a liquid sachet that can be printed with variable information such as the date of manufacture, for example, by a laser beam, and can be filled hygienically at high speed without contaminating the contents, and liquid using the same The present invention relates to a method for manufacturing a sachet and a liquid sachet package.

Conventionally, in addition to forming characters, symbols, drawings, etc. on the surface of packaging containers such as cans, bottles, plastic bottles, etc. in advance, it is possible to change the date of manufacture, manufacturer, product name, expiration date, etc. A method of printing information later with ink or the like is widely known.
As a packaging bag formed with ink or the like after the variable information on the surface of the packaging bag, for example, a packaging bag formed by mutually heat-sealing the heat seal layer located on one surface of the laminated film for packaging, At least one heat seal portion of the packaging bag is provided with an ink layer formed by an ink jet printer that displays necessary characters, symbols, etc. between both heat seal layers, and heats the binder of this ink layer. A packaging bag made of a material similar to the seal layer has been proposed (see, for example, Patent Document 1).
In addition, as a method for manufacturing the packaging bag, for example, the flexible packaging film having the heat seal layer is continuously fed and run, and the packaging film is heat sealed by vertical and horizontal heat sealing. When manufacturing packaging bags, the necessary characters, symbols, etc. are displayed on the part of the heat-seal layer of the packaging film that is being unrolled, where the vertical seal is applied, and the binder is the same material as the heat-seal layer. A method for manufacturing a packaging bag is proposed in which the ink layer is formed by a print head of an ink jet printer, in which the ink layer is held stationary in the vicinity of the guide roll (see, for example, Patent Document 2).

Laser-markable plastic characterized in that it is a thermoplastic plastic containing a pigment having a doped tin dioxide film, for example, as a thermoplastic plastic that can be printed with a laser beam (see, for example, Patent Document 3) In addition, a polyolefin resin composition for marking containing a silicon compound in an amount of 0.005 wt% or more and less than 0.5 wt% with respect to the polyolefin resin has been proposed (see, for example, Patent Document 4).
Japanese Patent No. 3319504 Japanese Patent No. 2820373 Japanese National Patent Publication No. 10-500149 Japanese Patent Laid-Open No. 7-286074

However, in the packaging bag for forming the ink layer formed by the ink jet printer proposed in Patent Document 1 and the method for manufacturing the packaging bag proposed in Patent Document 2, the range in which ink can be formed by the ink jet printer is Since it is limited to the heat seal portion, for example, when the heat seal width is small such as a liquid pouch, there is a problem that a space for printing variable information is narrow and reading is difficult.
Liquid sachets are liquids such as soy sauce, sauce, dressing, ramen soup, noodle soup, ketchup, tabasco, wasabi, mustard, etc., liquid seasonings, soup, fruit juice drinks, etc. In order to fill and package foods and beverages, etc., and the viscous body, the joint polymerization edge is heat-sealed to form a cylindrical bag body, the bag body is filled with the contents, and then the lateral direction is heated. It refers to packaging bags that can be arbitrarily selected according to the contents to be sealed and filled and packaged, filling conditions, etc., combined and laminated, and have various forms.
Moreover, in the packaging bag proposed by patent documents 1 and 2, and its manufacturing method, when the ink by an inkjet printer is formed in the part which protruded from the heat seal part, or the heat formation part is completely heat sealed. If not, the ink at that portion may be dissolved by the oil and fat derived from the contents, which is a sanitary problem.
In addition, in the plastic that can be printed by the laser beam proposed in Patent Documents 3 and 4, since the surface of the plastic member is printed, the surface can be wiped off with a solvent or the like. May be easily modified, and there is a problem in terms of preventing forgery.

  The problem of the present invention is that variable information can be printed in a range other than the heat seal portion of the liquid sachet, and can be printed on the front or back surface of the laminated film in the state of a long sheet or in the state of a package. Compared to conventional inkjet printers, printing is possible without touching the surface, the oil does not dissolve due to the oils and fats derived from the contents, it is hygienic, and it is difficult to alter the display after printing. Counterfeiting can be prevented, and a laminated sheet for liquid sachets that is excellent in high-speed sealing (hot tack), in-liquid sealing, sealing strength, impact resistance, heat resistance, etc., and liquid sachets using the same, It is to provide a method for producing a liquid sachet package.

  Therefore, in order to solve the above problems, in the laminated sheet for liquid sachets of the present invention, a stretched film as a base film layer and a multilayer laminated resin layer by T-die coextrusion molding are laminated via an anchor coating agent layer. A liquid sachet laminated sheet having a structure, and at least one layer other than the layer in contact with the contents of the multilayer laminated resin layer is made of a resin containing a color former that develops color by laser beam irradiation, and the liquid sachet The variable information can be printed by irradiating the surface of the laminated sheet with a laser beam.

  In the laminated sheet for liquid sachets of the present invention, the resin layer containing a color former that develops color when irradiated with a laser beam is a linear low-density polyethylene resin layer, and the other layers use a metallocene-based single site catalyst. It is characterized by comprising a polymerized linear low density polyethylene resin layer.

  Further, in the laminated sheet for liquid sachets of the present invention, the linear low-density polyethylene obtained by polymerizing the linear low-density polyethylene resin layer containing the color former that develops color by irradiation with a laser beam using a metallocene-based single-site catalyst. It is a resin layer.

  Further, the liquid sachet of the present invention is composed of the above-mentioned laminated sheet for liquid sachets, folded with the surface on the side of the multilayer laminated resin layer facing each other, and in the folded sheet, the edge in the longitudinal direction is heated. In addition to sealing, heat sealing is performed at a predetermined interval in a direction orthogonal to the longitudinal direction, and a plurality of wrapping bags are continuously provided in one direction.

  In addition, the method for manufacturing the liquid sachet package includes a long sheet supplying step of continuously supplying a long sheet by continuously running the constant length at a constant speed or intermittently at a constant speed, and the front side or the back side of the long sheet. The step of irradiating with laser beam and printing, the folding step of folding in two at the folding part along the longitudinal direction, and the side edge part facing the folding part of the long sheet are heat-sealed in the longitudinal direction. A vertical sealing step, a horizontal sealing step of heat-sealing the above laminated sheets at a position corresponding to the bottom in a direction perpendicular to the longitudinal direction, and a bag or body having an opening at a position corresponding to the upper side. A filling step of filling the contents of the preparation and a horizontal sealing step of heat-sealing the opening and sealing the upper side are sequentially performed.

According to the laminated sheet for a liquid sachet of the present invention and a packaging bag using the same, variable information can be formed in a region other than the heat-sealed portion of the liquid sachet, for example, the date of manufacture, Variable information such as manufacturer, product name, expiration date, and production location is easier to read than a conventional inkjet printer, and a large amount of information can be printed.
Further, at least one layer other than the layer in contact with the contents of the multilayer laminated resin layer formed by T-die coextrusion forming the laminated sheet for liquid sachets of the present invention is composed of a resin layer containing a color former that develops color by laser beam irradiation. Enables printing without bringing ink into contact with the surface of the laminated sheet for liquid sachets, and without sacrificing ink printed by the oil and fat derived from the contents of the packaging bag. Forgery can be prevented because it is difficult to modify the display.
Further, the multilayer laminated resin layer comprises a linear low density polyethylene resin layer containing a color former that develops color when irradiated with a laser beam, and a linear low density polyethylene resin layer polymerized using a metallocene-based single site catalyst. The liquid sachet of the present invention has a high-speed sealing property (hot tack property) and a submerged seal by adopting a configuration in which the multilayer laminated resin layer is laminated on the base film layer from the outside by T-die coextrusion molding. It has excellent properties, seal strength, impact resistance, heat resistance and the like.
Further, according to the method for producing a liquid sachet package of the present invention, printing is possible not only at the stage of the package but also at the stage of the long sheet, so that it can be printed not only on the front surface but also on the back surface of the laminated sheet. is there.
Further, according to the method for producing a liquid sachet package of the present invention, since it is a printing method by laser beam irradiation, printing can be performed at a higher speed than a printing method by an ink jet printer. The printed image of variable information can be clearly engraved.

Embodiments of the laminated sheet for liquid sachets according to the present invention, a liquid sachet using the same, and a method for producing a liquid sachet package will be described in detail below with reference to the drawings.
First, the layer structure constituting the laminated sheet according to the present invention will be described with reference to the drawings, and FIG. 1 and FIG. 2 show a few examples of the laminated sheet for liquid sachets according to the present invention. FIG. 3 is a schematic cross-sectional view showing a layer structure, and FIG. 3 shows a layer structure in which a laminated sheet according to the present invention shown in FIG. 1 or 2 is used, and a laser print image is formed by irradiating this with a laser beam. FIG. 4 is a schematic perspective view showing a liquid sachet formed by using the laminated sheet for a liquid sachet shown in FIG. 3 and making the bag, and FIG. 5 is a schematic perspective view showing the above. 4 is a schematic perspective view showing a liquid sachet package formed by filling the contents into the liquid sachet shown in FIG. 4, and FIG. 6 is a schematic view showing a manufacturing example of the liquid sachet package shown in FIG. FIG.

As shown in FIG. 1, a laminated sheet 10 for a liquid sachet according to the present invention includes a base film 2 made of a transparent or translucent stretched film and a multilayer laminated resin layer 7 formed by T-die coextrusion molding. It is a layer structure laminated via the agent layer 4, and at least one layer other than the layer in contact with the contents of the multilayer laminated resin layer is composed of one or more resin layers 6 containing a color former that develops color by laser beam irradiation. The layer in contact with the object has a basic structure of a layer structure composed of the heat-sealable resin layer 8.
By adopting the above configuration, variable information can be printed without bringing ink into contact with the surface of the laminated sheet 10 for liquid sachets, and the ink printed by the oil and fat content derived from the contents stored in the liquid sachets is dissolved. Therefore, forgery can be prevented since it is excellent in hygiene and it is difficult to alter the display after printing.

As an example of the laminated sheet 10 for liquid sachets according to the present invention, as shown in FIG. 2, the anchor coat layer 4 is applied to the biaxially stretched polyamide resin film layer 2a as a stretched base film layer, with the basic structure of FIG. The multi-layer laminated resin layer 7 is formed and laminated on the anchor coat layer surface side by T-die coextrusion molding.
The multi-layer laminated resin layer 7 by the T-die coextrusion molding is a linear low polymer polymerized using one or more resin layers 6a containing a color former that develops color by laser beam irradiation and a metallocene-based single site catalyst. It consists of a density polyethylene resin layer 8a.
Furthermore, the resin layer 6a containing a color former that develops color when irradiated with a laser beam and the heat seal resin layer 8a are more preferable because the same kind of resin is used and the interlayer adhesion is excellent.
By adopting the configuration of FIG. 2, in addition to the operational effects of the layer configuration of FIG. 1, heat resistance, pinhole resistance, impact resistance, low temperature heat sealability, high speed sealability (hot tack property), submerged seal Property, sealing strength, heat resistance, etc.
Although not shown in the drawing, a layer structure provided between the stretched base film layer 2 and the multilayer laminated resin layer 7 by T-die coextrusion molding can also be used.
The above illustrations illustrate a few examples of the laminated sheet 10 for liquid sachets according to the present invention, and the present invention is not limited thereto.

FIG. 3 shows a resin layer 6a containing a color former that develops color when irradiated with a laser beam from the surface of the laminated sheet 10 for liquid sachets according to the present invention. Thus, a layer for forming the variable information by the laser print image 5 is constituted.
In the above, the laser-printed image 5 can be formed by irradiating the laser beam from either the surface side of the stretched base film layer 2 of the laminated sheet 10 for liquid sachets or the surface side of the heat seal resin layer 8. .

  By the way, in the laminated sheet 10 for liquid sachets according to the present invention, the resin layer 6 containing a color former by laser beam irradiation basically contains a resin as a main component of the vehicle, and further contains a color former that develops color by laser beam irradiation, And the content of the color former that develops color when irradiated with the laser beam comprises a resin layer made of a resin composition consisting of 0.01% by weight to 10.0% by weight, thereby absorbing energy by the laser beam, By carbonizing and coloring, for example, laser-printed images such as letters, symbols, numbers, and drawings can be formed very clearly, and the stretched base film layer 2 positioned on both sides of the laser-printed image 5 and heat sealability The resin layer 8 protects the laser-printed image 5 in the distribution process, and prevents alteration, alteration, etc. of variable information. It is intended.

Furthermore, in the liquid sachet 20 according to the present invention, as shown in FIG. 4, the laminated sheet 10 for liquid sachet according to the present invention is used to overlap the heat-sealable resin layer 8 so as to face each other. The liquid pouch 20 according to the present invention can be manufactured by heat-sealing the two end portions to form the vertical seal portion 22a and the horizontal seal portion 22b.
Although not shown, it goes without saying that the liquid sachet 20 according to the present invention is not limited to the illustrated liquid sachet 20 shown above. In addition to seal-type packaging bags, four-way seal-type packaging bags, self-supporting packaging bags, gusset-type packaging bags, etc. In addition, the forms include small bags, medium bags, large bags, etc. It can be taken.
Then, as shown in FIG. 5, the liquid sachet packaging body 30 according to the present invention uses the above-described liquid sachet 20 to rapidly fill the liquid or viscous content 28 from the upper opening thereof. Thereafter, the opening portion is heat sealed to form the upper side seal portion 26, and the package 30 of the liquid pouch according to the present invention can be manufactured.
As a result, it is suitable for high-speed filling and storage of contents, and also has excellent disposal and environmental suitability without generating harmful substances when incinerated and discarded after use (foreign matter). It has the advantage of not reacting to metal detectors.

Next, in the present invention, a method for printing the variable information on the package 30 as a laser print image by irradiating it with a laser beam using the laminated sheet 10 for liquid sachets according to the present invention as described above. For example, an example of a filling and packaging apparatus that fills and packs liquid food and drink such as sauce and soy sauce as the contents 28 for individual packaging will be described first. The laminated sheet for liquid sachets (long sheet A) according to the present invention is fed from the take-up roll 11, and the long sheet A is further fed through the step rolls 12, 12 and the like. Guide the guide roller 13 while adjusting the supply.
Next, the guide roll 13 is irradiated with a laser beam from the front side of the long sheet A, and a laser print image is formed on the intermediate layer of the long sheet A (resin layer containing a color former that develops color by laser beam irradiation). 6) to print variable information.
If necessary, the step roll 12 is irradiated with a laser beam from the back side of the long sheet A to form a laser print image on the intermediate layer of the long sheet A to print variable information. You can also.
Next, the long sheet A guided by the guide roll 13 is folded in two so that the surface of the sealant layer is opposed to the long sheet A through a normal triangular plate (not shown) and the like. The sheet is fed to a pair of longitudinal seal rollers 15 and 15 through a guide frame 14 for guiding the sheet A. Next, the end of the outer side of the elongated sheet A folded in half is vertically sealed by the pair of vertical seal rollers 15, 15, so that the vertical seal 22 a of the outer side is obtained. Form.
Further, the folded long sheet A is fed to a pair of first horizontal seal rollers 16, 16, and the pair of horizontal seal rollers 16, 16 is used to And a horizontal seal 22b corresponding to the bottom.

On the other hand, liquid foods and drinks such as sauce and soy sauce are continuously supplied from the filling nozzle 17 filling liquid foods and drinks such as sauce and soy sauce, and the outer side. The side vertical seal portion 22a and the horizontal seal portion 22b are sequentially and repeatedly formed in a synchronized manner, and then stabilized by the pair of second horizontal seal rollers 18 and 18. In order to obtain the seal strength, heat and pressure are once again applied to the portion of the above-mentioned horizontal seal portion 22b, and further cooled, and then the photoelectric tube device is arranged to arrange the above-mentioned horizontal seal portion 22b. After that, the cutter devices 20 and 20 cut the center line of the horizontal seal portion 22b so that the bottom seal portion 24 and the top seal portion 26 are separated. Formed from a three-sided seal type sachet form in which the contents 28 are filled and packaged and variable information can be read on the front and / or back It is possible to produce a packaged product 30 that.
By adopting the above manufacturing method, it can be manufactured easily and with high productivity, and the variable information can be printed on the entire bag without limiting the range in which the variable information can be printed to the heat-sealed portion of the liquid sachet. It has the advantage of easy reading of information.
In addition, because variable information is printed without using ink, it has excellent adhesion between layers in the printed part and the adhesive strength between heat seal layers, and can prevent counterfeiting without the influence of scratches from the outside. There is an advantage that the ink of the part is not melted out by the fats and oils derived from the product, and it is excellent in hygiene.

Further, in the present invention, using the laminated sheet 10 for liquid sachets according to the present invention as described above, as another method of irradiating this with a laser beam and printing variable information on the package 30 as a laser print image, The liquid sachet laminated sheet (long sheet A) according to the present invention is fed from the take-up roll 11, and the long sheet A is further passed through the step rolls 12, 12, etc. Guide the guide roll 13 while adjusting the supply.
Next, the long sheet A guided by the guide roll 13 is folded in two so that the surface of the sealant layer is opposed to the long sheet A through a normal triangular plate (not shown) and the like. The sheet is fed to a pair of longitudinal seal rollers 15 and 15 through a guide frame 14 for guiding the sheet A. Next, the end of the outer side of the elongated sheet A folded in half is vertically sealed by the pair of vertical seal rollers 15, 15, so that the vertical seal 22 a of the outer side is obtained. Further, the long sheet A formed and folded in two is fed to a pair of first horizontal seal rollers 16, 16, and the pair of horizontal seal rollers 16, 16. Thus, the upper side seal portion 26 and the bottom side seal portion 24 are formed by horizontal sealing corresponding to the upper side and the bottom side.
On the other hand, liquid foods and drinks such as sauce and soy sauce are continuously supplied from the filling nozzle 17 and filled, and at the same time, the vertical seal portion 22a and the horizontal seal portion 22b on the outer side are synchronized. In order to obtain a stable seal strength with the pair of second horizontal seal rollers 18, 18, a portion of the horizontal seal portion 22 b described above is formed. Then, heat and pressure are once again applied, and then a laser beam is irradiated from the front side of the package 30 to the vertical seal portion or the horizontal seal portion, the variable information is printed on the surface, and then cooled, The photoelectric tube device is arranged to look at the center line of the horizontal seal portion 22b, and then the cutter devices 20 and 20 cut the center line of the horizontal seal portion 22b to cut the bottom line. -A three-sided seal type small unit that forms a seal part 24 and an upper seal part 26 and is readable from the surface side. It is possible to produce a packaged product 30 of the form.
When adopting the above manufacturing method, variable information can be printed by laser irradiation even after filling the contents, it can be easily manufactured with good productivity, and variable information is printed without using ink. Therefore, the adhesion between the layers in the print forming part and the adhesive strength between the heat seal layers are excellent, it is difficult to be damaged from the outside, it is possible to prevent forgery, and the ink of that part may be dissolved by the oil and fat derived from the contents And has the advantage of superior hygiene.
In the above, the range in which the variable information can be printed by laser irradiation is not limited to the heat seal portion of the liquid sachet, but can be widely printed on the entire portion of the liquid sachet, and the print information can be easily read by the consumer.
In the manufacturing method in which variable information is printed after filling the above contents, the variable information is printed on a smooth part such as a seal part that is filled with the contents and does not form irregularities on the surface of the bag. Printing is preferable because a clear printed image can be formed.

  As a laser beam, when a carbon dioxide laser (wavelength 10.6 μm), which is usually used in laser printing, is used, laser printing is performed by irradiating a carbon dioxide laser beam to cut and carbonize the surface. Yes, it is not preferable because it emits smoke during irradiation, or is inferior in workability to a thin film, and further, it is not preferable because there are problems such as easy generation of holes in laser printed images. It is.

In the present invention, laser printing using a YAG [Yttrium (Y) / Aluminum (A) / Garnet (G)] laser beam (wavelength 1.064 μm) as the laser beam prevents the occurrence of smoke, perforations, etc. This is preferable because it is possible.
And in this invention, said YAG laser beam has the property which permeate | transmits a transparent body, Utilizes the property, Furthermore, a laser beam irradiation color-development film layer consists of other transparent or translucent resin layers etc. Suppressing the generation of smoke, etc. by being sandwiched between resin films, etc., and addition amount of color former that develops color by laser beam irradiation that is present in the resin layer that contains color former that develops color by laser beam irradiation that constitutes the laminated film for liquid sachets, Adjusting the film thickness of the laminated film for liquid sachets and taking into account the effect on the color density and the laminated film for liquid sachets, even if a laser printed image is formed, a very clear laser printed image is formed without holes etc. It is possible.
Further, in the above, as the laser irradiation position, flickering of the long sheet during traveling can be suppressed by irradiating the position of the long sheet on the guide roll with a laser beam, so that a clear printed image is formed. This is preferable.

Next, in the present invention, the laminated sheet 10 for liquid sachets according to the present invention, the material constituting the liquid sachet 20 and the like, and the production method thereof will be described. First, as the stretched substrate film layer 2 according to the present invention, Since this is a basic material constituting a laminated sheet and packaging bag, it has strength and has excellent properties in terms of mechanical, physical, chemical, etc. For example, polyester resin, polyamide resin, polyaramide resin, polyolefin resin such as polyethylene resin or polypropylene resin, polycarbonate resin, polystyrene resin, polyacetal resin, fluorine resin, etc. A tough resin film or sheet, etc. can be used.
In the present invention, it is particularly preferable to use a polyamide resin, a polyester resin, or a polypropylene resin film or sheet.

In the present invention, as the above-mentioned various resin films or sheets, for example, one or more of the above-mentioned various resins are used, and an extrusion method, a cast molding method, a T-die method, a cutting method, an inflation method, etc. are manufactured. Various types of resins can be obtained by a method of forming the above-mentioned various resins independently using a membrane method, and further by using two or more types of resins and mixing them before forming a film. Further, for example, a stretched film or the like stretched uniaxially or biaxially using a tenter method, a tubular method, or the like can be used.
The thickness of the film is preferably about 5 μm to 100 μm, more preferably about 30 μm to 70 μm.

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, etc. A very small amount to several tens of percent can be optionally added 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 the present invention, the surface of various resin films or sheets can be provided with a desired surface treatment layer in advance, if necessary, in order to improve adhesion to the intermediate layer.
In the present invention, as the surface treatment layer, for example, pretreatment such as corona treatment, ozone treatment, low temperature plasma treatment, glow discharge treatment, oxidation treatment, etc. is performed. For example, corona treatment layer, ozone treatment layer, plasma A treatment layer, an oxidation treatment layer, and the like can be formed.
In the present invention, the base film 2 as described above is subjected to surface printing or back printing by a normal printing method on a desired printing pattern such as characters, figures, symbols, patterns, patterns, etc., for example. It may be.

  Next, as the intermediate layer 6 constituting the laminated sheet 10 for liquid sachets of the present invention, a resin that forms a transparent or translucent resin layer comprising at least one resin layer containing a color former that develops color when irradiated with a laser beam. For example, it is possible to use a mixture of one or two or more heat-adhesive resins that can be melted by heat and extruded from an extrusion die such as an extruder, and further heat-bonded to each other. Specifically, for example, low density polyethylene, linear low density polyethylene, linear low density polyethylene polymerized using a metallocene single site catalyst, ethylene-α / olefin copolymer, medium density polyethylene , High density polyethylene, polypropylene resin, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene Acrylic acid such as ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, polyethylene or polypropylene, methacrylic acid, maleic Acid-modified polyolefin resin modified with unsaturated carboxylic acid such as acid, maleic anhydride, fumaric acid, itaconic acid, polyvinyl acetate resin, poly (meth) acrylic resin, polyvinyl chloride resin, thermoplastic polyester resin, One or more thermoplastic resins such as thermoplastic polyamide resins and others can be used.

Next, in the coextruded multilayer resin layer 7 constituting the laminated sheet 10 for liquid sachets according to the present invention, as a color former that develops color by laser beam irradiation, for example, a colorant such as a dye or a pigment, clays, or the like is used. Specifically, yellow iron oxide, inorganic lead compounds, manganese violet, cobalt violet, mercury, cobalt, copper, bismuth, nickel and other metal compounds, pearlescent 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 + antimony + titanium oxide coated mica Can be used.
As for the amount of addition, it can be used by adding about 0.01 wt% to 10 wt%, preferably about 0.05 wt% to 5 wt% with respect to the resin.

  Next, in the laminated sheet 10 for liquid sachets according to the present invention, the heat-sealable resin film or sheet used for the heat-sealable resin layer 8 constituting the coextruded multilayer resin layer 7 is specifically For example, a resin film or sheet that can be melted by heat and fused to each other can be used. For example, polymerized using a low density polyethylene, a medium density polyethylene, a high density polyethylene, or a metallocene catalyst. Linear (linear) low-density polyethylene, ethylene-α / olefin copolymer polymerized using metallocene catalyst, polypropylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer , Ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl methacrylate copolymer, ethylene Polyolefin resin such as pyrene copolymer, methylpentene polymer, polybutene polymer, polyethylene or polypropylene is used with unsaturated carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid. A modified acid-modified polyolefin resin, polyvinyl acetate resin, poly (meth) acrylic resin, polyvinyl chloride resin, or other resin film or sheet can be used.

  Among the heat-seal resins constituting the heat seal resin layer 8, those obtained by polymerizing linear (linear) low density polyethylene using a single site catalyst such as a metallocene catalyst are particularly preferred. In addition to heat seal stability, it has excellent content resistance, stress cracking resistance, low-temperature heat sealability, hot sealability, and the liquid of the present invention. It can be suitably used for a sealant layer of a sachet.

In addition to the above linear (linear) low density polyethylene, the heat seal resin layer 8 includes CPP (unstretched polypropylene) depending on the contents to be filled, the heat treatment after filling, the distribution conditions, and the like. ), LDPE, ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid ester copolymer, ionomer, polyester resin, etc. It can be appropriately selected and used.
In the present invention, the heat-sealable resin 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. it can.
In the present invention, the thickness of the heat sealable resin layer 8 is preferably about 5 μm to 300 μm, more preferably about 10 μm to 100 μm.

In addition, in the present invention, for example, it is preferable to form a vapor-deposited film of an inorganic oxide on the stretched base film layer 2 as a barrier layer, for example.
If necessary, a barrier resin coating film of vinylidene chloride resin or ethylene vinyl alcohol copolymer resin can be used on the stretched substrate film 2.
As the deposited film of the inorganic oxide, any thin film obtained by making a metal oxide amorphous can be used. For example, silicon (Si), aluminum (Al), magnesium ( Metals such as Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y) It is possible to use a thin film obtained by making the oxide of amorphous.
Examples of suitable materials for packaging materials include thin films obtained by making metal oxides such as silicon (Si) and aluminum (Al) amorphous.
A thin film obtained by making the above metal oxide amorphous can be called a metal oxide such as silicon oxide, aluminum oxide, and the like. For example, SiO _x , AlO _X, MO _X (in the formula, M represents a metal element, the value of X is in the range respectively of a metal element different.) as such MgO _X represented by.
In the present invention, the thickness of the inorganic oxide vapor-deposited film as described above varies depending on the type of metal oxide used, but is preferably about 50 to 3000 mm, and within the range of 100 to 1000 mm. More preferably, it is arbitrarily selected and formed.
In the present invention, the inorganic oxide vapor-deposited film may be not only one layer of inorganic oxide thin film but also a laminate of two or more layers, and a metal oxide used. As an inorganic oxide thin film, a mixture of different materials may be used by using one or a mixture of two or more.

Next, in the present invention, a method for laminating the stretched base film layer 2 and the coextruded multilayer resin layer 7 constituting the laminate will be described. The stretched base film layer 2 and the coextruded multilayer resin layer 7 These layers can be formed by an extrusion lamination method, a co-extrusion lamination method, a dry lamination method, a solventless lamination method, a wet lamination method, or the like.
When performing the above lamination, if necessary, pretreatment such as corona treatment or ozone treatment can be applied to the coextruded multilayer resin layer 7 on the laminate surface side.

Next, as the anchor coating agent layer 4 constituting the laminated sheet 10 for liquid sachets 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 modification of these latexes And 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 and aqueous lignin derivative, etc. An emulsion or dispersion anchor coat agent is used.
For example, when the outermost layer is a polypropylene-based melt-extruded resin layer, a polypropylene-based or modified polyolefin-based emulsion or dispersion is preferable in consideration of the adhesion to the substrate.
As an application method of the above anchor coating agent, for example, a gravure coating method, a reverse roll coating method, a knife coating method, a kiss coating method, and the like may be applied. It can, as the coating amount, in the dry ^{state, 0.1g / m 2 ~5g / m} 2 is preferred.

The laminated sheet 10 for liquid sachets of the present invention uses the above-described layers, and from the outside, stretched base film layer and co-extruded multilayer resin layer 7 by T-die coextrusion molding via an anchor coat agent layer 4. And can be manufactured by stacking.
Of the co-extruded multilayer resin layer 7, at least one layer other than the layer in contact with the contents is a linear low density polyethylene resin layer containing a color former that develops color when irradiated with a laser beam, and constitutes the other layers. However, it consists of a linear low density polyethylene resin layer (side in contact with the contents) polymerized using a metallocene based single site catalyst.
Then, the coextruded multilayer resin layer 7 side of the laminated sheet 10 for liquid sachets obtained above is overlapped and folded so as to face, and the edge in the longitudinal direction of the folded sheet is heat-sealed, It is possible to manufacture a liquid sachet package 30 that is heat-sealed at a predetermined interval in a direction orthogonal to the longitudinal direction, is filled with a liquid content inside, and a plurality of wrapping bags are arranged in one direction.
In the present invention, the liquid sachet package 30 produced as described above specifically includes sauce, syrup, ponzu, soy sauce, dressing, ramen soup, noodle soup, ketchup, tabasco, wasabi, Filled and packaged with liquid food and drink such as mustard and other liquid seasonings, soup and others.
And in this invention, since the liquid sachet package 30 manufactured above consists of the resin layer containing the color former which color-develops by laser beam irradiation to the intermediate | middle layer which comprises the laminated sheet for liquid sachets of this invention as mentioned above. By laser beam irradiation from the base film layer 2 side or the heat seal layer 8 side of the laminated film, carbonized and colored in the irradiated portion of the laser beam, for example, numbers such as date of manufacture, letters, symbols, designs, etc. Variable information can be printed, and it can be printed without touching the surface compared to conventional ink jet printers. The ink is not dissolved by oils and fats derived from the contents. Because it is difficult to modify, counterfeiting can be prevented, and high-speed sealing (hot tack), submerged sealing, sealing strength, impact resistance, heat resistance, etc. Excellent high-speed filling suitability of liquid foods and beverages.

Next, the present invention will be described in further detail with reference to examples.
A laminated sheet 10 for liquid sachets shown in the sectional view of FIG. 2 was produced as follows.
First, a 15 μm biaxially stretched nylon film is used as the base film layer 2a, a gravure ink composition is used on the corona-treated surface, a pattern printing layer is formed by a gravure printing method, and the pattern printing surface is formed. Then, the anchor coating agent layer 4a having a thickness of 0.5 g / m ² (dry state) was formed by coating the isocyanate anchor coating agent 4 by the gravure roll coating method.
On the other hand, as an intermediate layer (resin layer 6a containing a color former by laser beam irradiation), 98 parts by weight of a linear low-density polyethylene resin layer (made by Ube Industries, trade name Umerit 021GT) polymerized using a metallocene catalyst, A resin composition was prepared by sufficiently kneading 2 parts by weight of YAG laser coloring pigment (Merck Japan, trade name, Iriodin LS-825).
Next, as the heat seal layer 8a, 100 parts by weight of a linear low density polyethylene resin layer (Ube Industries, trade name Umerit 022GS) polymerized using a metallocene catalyst, and 0.1 part by weight of erucamide are used. The resin composition was prepared by sufficiently kneading.
Next, on the surface of the anchor coating agent layer 4a formed as described above, the resin composition of the resin layer 6a containing a color former formed by laser beam irradiation and the resin composition of the heat seal resin layer 8a are obtained using a T-die co-extruder. And a co-extrusion coat having a total thickness of 50 μm comprising a resin layer 6 a containing a color former produced by laser beam irradiation having a thickness of 25 μm and a heat seal layer 8 a having a thickness of 25 μm. A laminated sheet 10 for a liquid sachet according to the present invention comprising a film layer 2a / pattern printing layer / anchor coating agent layer 4a / resin layer 6a containing a color former formed by laser beam irradiation / heat seal layer 8a was produced.

Next, the laminated sheet 10 for liquid sachets produced as described above was used, and further a three-side seal type sachet filling and packaging machine as shown in FIG. 6 was used.
First, the long sheet A of the laminated sheet 10 for liquid sachets according to the present invention is fed from the take-up roll 11 and irradiated with a laser beam from the front side of the long sheet A at the step roll 12 portion. Then, variable information was printed by forming a laser-printed image on the intermediate layer of the long sheet A (resin layer 6a containing a color former by laser beam irradiation).
Thereafter, the sheet is folded in two along the longitudinal direction of the long sheet A and overlapped to form a vertical seal portion, and a horizontal seal corresponding to the bottom is formed to form the bottom seal portion 24, and the upper side The liquid soup was filled as the contents from the opening, and the opening was heat-sealed to seal the upper side to form the upper-side seal portion 26, whereby the liquid pouch packaging 30 according to the present invention was manufactured.
In printing, the laser irradiation does not generate smoke and holes, and the variable information can be clearly printed in a non-contact manner. It is excellent and can prevent counterfeiting because it is difficult to alter the display after printing, and it has excellent high-speed filling properties such as high-speed sealing, sealing in liquid, sealing strength, impact resistance, and heat resistance. It was.
In the above manufacturing method, the laser beam is irradiated from the front side of the long sheet A even when variable information is printed by irradiating the laser beam from the back side without irradiating the laser beam from the front side of the long sheet A. The same effect is obtained, smoke and perforation do not occur, the ink does not dissolve due to the oil content from the contents, variable information can be clearly printed, hygiene, anti-counterfeiting, high speed It was excellent in filling suitability.
In addition, in the above manufacturing method, when the upper seal portion 26 that is the opening portion is filled and the upper seal portion 26 that is the opening portion is sealed, printing is performed by irradiating the vertical seal portion or the horizontal seal portion from the outside with a laser beam. As in the case of irradiating with a laser beam, variable information can be printed clearly, and it has excellent hygiene, anti-counterfeiting, and high-speed filling suitability.

A laminated film 10 for liquid sachets shown in the sectional view of FIG. 3 was produced as follows.
First, a 15 μm biaxially stretched nylon film was used as the stretched substrate film layer 2a, and a gravure ink composition was used on the corona-treated surface, and a pattern printing layer was formed by a gravure printing method.
On the other hand, as a resin layer 6a containing a color former by laser beam irradiation, 95 parts by weight of a linear low density polyethylene resin layer (product name Umerit 021GT, manufactured by Ube Industries) polymerized using a metallocene catalyst, and a YAG laser color pigment (Merck Japan Co., Ltd., trade name, Iriodin LS-825) 5.0 parts by weight was sufficiently kneaded to prepare a resin composition.
Next, as the heat seal resin layer 8a, 100 parts by weight of a linear low density polyethylene resin layer (Ube Industries, trade name Umerit 022GS) polymerized using a metallocene catalyst, and 0.1 part by weight of erucamide are used. The resin composition was prepared by sufficiently kneading.
Next, on the surface of the anchor coating agent layer 4a formed above, the resin composition of the resin layer 6a containing a color former by irradiation with a laser beam and the resin composition of the heat seal layer 8a are T die co-extruder. Co-extruded and formed by co-extrusion coating with a total thickness of 50 μm consisting of an intermediate layer 6 a having a thickness of 25 μm and a heat-seal layer 8 a having a thickness of 25 μm, and layer structure, base film layer 2 a / picture printing layer / anchor A laminated film 10 for a liquid sachet according to the present invention comprising a coating agent layer 4a / a resin layer 6a containing a color former formed by laser beam irradiation / a heat seal resin layer 8a was produced.

Next, the laminated film 10 for liquid sachets produced as described above was used, and further a three-side seal type sachet filling and packaging machine as shown in FIG. 6 was used.
First, the long sheet A of the liquid pouch laminate 10 according to the present invention is fed from the take-up roll 11 and irradiated with a laser beam from the front side of the long sheet A at the step roll 12 portion. Then, variable information was printed by forming a laser-printed image on the intermediate layer of the long sheet A (resin layer 6a containing a color former by laser beam irradiation).
Thereafter, the sheet is folded in two along the longitudinal direction of the long sheet A and overlapped to form a vertical seal portion, and a horizontal seal corresponding to the bottom is formed to form the bottom seal portion 24, and the upper side The liquid soup was filled as the contents from the opening, and the opening was heat-sealed to seal the upper side to form the upper-side seal portion 26, whereby the liquid pouch packaging 30 according to the present invention was manufactured.
In printing, the laser irradiation does not generate smoke and holes, and the variable information can be clearly printed in a non-contact manner. It is excellent, and it is difficult to alter the display after printing, so it is possible to prevent forgery, and it has excellent high-speed filling suitability such as high-speed sealing, liquid sealing, sealing strength, impact resistance, and heat resistance. It was.
In the above manufacturing method, the laser beam is irradiated from the front side of the long sheet A even when variable information is printed by irradiating the laser beam from the back side without irradiating the laser beam from the front side of the long sheet A. The same effect is obtained, smoke and perforation do not occur, the ink does not dissolve due to the oil content from the contents, variable information can be clearly printed, hygiene, anti-counterfeiting, high speed It was excellent in filling suitability.
In addition, in the above manufacturing method, when the upper seal portion 26 that is the opening portion is filled and the upper seal portion 26 that is the opening portion is sealed, printing is performed by irradiating the vertical seal portion or the horizontal seal portion from the outside with a laser beam. As in the case of irradiating with a laser beam, variable information can be printed clearly, and it has excellent hygiene, anti-counterfeiting, and high-speed filling suitability.

The laminated sheet 10 for liquid sachets shown in the sectional view of FIG. 3 was produced as follows.
First, a 15 μm biaxially stretched nylon film was used as the stretched substrate film layer 2a, and a gravure ink composition was used on the corona-treated surface, and a pattern printing layer was formed by a gravure printing method.
On the other hand, as the first layer of the intermediate layer 6a, 98 parts by weight of a linear low density polyethylene resin layer (manufactured by Ube Industries, trade name Umerit 021GT) polymerized using a metallocene catalyst, and YAG laser coloring pigment (Merck Japan Co., Ltd.) A resin composition was prepared by sufficiently kneading 2.0 parts by weight made by company, trade name, Iriodin LS-825).
Next, 100 parts by weight of a linear low density polyethylene resin layer (manufactured by Ube Industries, trade name Umerit 021GT) polymerized using a metallocene catalyst was prepared as the second layer of the intermediate layer 6b.
Next, as the heat seal layer 8a, 100 parts by weight of a linear low density polyethylene resin layer (manufactured by Ube Industries, trade name Umerit 022GS) polymerized using a metallocene catalyst and 0.1 part by weight of erucamide are sufficiently obtained. The resin composition was adjusted by kneading.
Next, on the surface of the anchor coating agent layer 4 formed as described above, a resin layer 6a containing a color former produced by laser beam irradiation, a resin composition of the thermoplastic resin layer 6b, and a resin composition of the heat seal resin layer 8a are provided. The resin layer 6a is co-extruded by a T-die coextrusion machine and contains a color former formed by laser beam irradiation having a thickness of 20 μm, the thermoplastic resin layer 6b having a thickness of 10 μm, and the heat seal layer 8a having a thickness of 20 μm. Formed by co-extrusion coating with a total thickness of 50 μm, layer structure, stretched base film layer 2a / pattern printing layer / anchor coating agent layer 4a / resin layer 6a containing thermoplastic colorant / thermoplastic resin layer 6b / The laminated sheet 10 for liquid sachets according to the present invention comprising the heat seal resin layer 8a was produced.

Next, the laminated sheet 10 for liquid sachets produced as described above was used, and further a three-side seal type sachet filling and packaging machine as shown in FIG. 6 was used.
First, the long sheet A of the sheet 10 for liquid sachet according to the present invention is fed from the take-up roll 11 and irradiated with a laser beam from the front side of the long sheet A at the step roll 12 portion. The variable information was printed by forming a laser-printed image on the intermediate layer of the long sheet A.
Thereafter, the sheet is folded in two along the longitudinal direction of the long sheet A and overlapped to form a vertical seal portion, and a horizontal seal corresponding to the bottom is formed to form the bottom seal portion 24, and the upper side The liquid soup was filled as the contents from the opening, and the opening was heat-sealed to seal the upper side to form the upper-side seal portion 26, whereby the liquid pouch packaging 30 according to the present invention was manufactured.
In printing, the laser irradiation does not generate smoke and holes, and the variable information can be clearly printed in a non-contact manner. It is excellent, and it is difficult to alter the display after printing, so it is possible to prevent forgery, and it has excellent high-speed filling suitability such as high-speed sealing, liquid sealing, sealing strength, impact resistance, and heat resistance. It was.
In addition, in the above manufacturing method, when the upper seal portion 26 that is the opening portion is filled and the upper seal portion 26 that is the opening portion is sealed, printing is performed by irradiating the vertical seal portion or the horizontal seal portion from the outside with a laser beam. As in the case of irradiating with a laser beam, variable information can be printed clearly, and it has excellent hygiene, anti-counterfeiting, and high-speed filling suitability.

It is a schematic sectional drawing which shows the layer structure of the lamination sheet 10 for liquid sachets concerning this invention. It is a schematic sectional drawing which shows the layer structure of the lamination sheet 10 for liquid sachets concerning this invention. FIG. 2 is a schematic cross-sectional view showing a layer structure in which a laser-printed image 5 is formed by irradiating a laser beam 32 on the laminated sheet 10 for liquid sachets according to the present invention shown in FIG. 1. It is a schematic perspective view which shows the liquid sachet 20 formed by using the laminated sheet 10 for liquid sachets shown in said FIG. 1 or FIG. 2, and bag-making this. It is a schematic perspective view which shows the liquid pouch packaging body 30 which uses the liquid pouch shown in said FIG. 4, and fills this with the content. It is a schematic perspective view which shows the manufacture example concerning this invention of the liquid pouch packaging body 30 of said FIG.

Explanation of symbols

2 Stretched substrate film layer 2a Biaxially stretched polyamide resin film layer 4 Anchor coat agent layer 5 Laser printed image 6, 6a Resin layer 6b containing color former by laser beam irradiation Thermoplastic resin layer 7 Coextrusion by T-die coextrusion molding Multilayer resin layer 8 Heat-sealable resin layer 8a Linear low density polyethylene resin layer 10 polymerized using metallocene-based single site catalyst 10 Laminated sheet 11 for liquid pouch 11 Winding roll 12 Step roll 13 Guide roll 14 Guide frame 15 Vertical Sealing roll 16 First horizontal sealing roll 17 Filling nozzle 18 Second horizontal sealing roll 20 Cutter device 22 Side seal part 22a Vertical seal part 22b Horizontal seal part 23 Opening 24 Bottom seal part 26 Upper seal part 28 Contents 30 Liquid sachet packaging 32 Laser beam 34 Laser irradiation device 36 Laser controller 40 Laser irradiation means A Long sheet

Claims (5)

  A laminated sheet for a liquid pouch comprising a stretched film as a base film layer and a multilayer laminated resin layer formed by T-die coextrusion molding via an anchor coating agent layer, and the multilayer laminated resin described above Of the layers, at least one layer other than the layer in contact with the contents is made of a resin containing a color former that develops color by laser beam irradiation, and variable information can be printed by irradiating the laser beam from the surface of the laminated sheet for liquid sachets. A laminated sheet for liquid sachets characterized by   In the above multilayer laminated resin layer by T-die coextrusion molding, the resin layer containing a color former that develops color by laser beam irradiation is composed of a linear low density polyethylene resin layer, and the other layers use a metallocene single site catalyst. The laminated sheet for liquid sachets according to claim 1, comprising a linear low-density polyethylene resin layer polymerized by polymerization.   3. The linear low-density polyethylene resin layer containing a color former that develops color when irradiated with a laser beam is a linear low-density polyethylene resin layer polymerized using a metallocene single-site catalyst. A laminated sheet for liquid sachets according to 1.   It consists of the laminated sheet for liquid sachets according to any one of claims 1 to 3, bent with the surface on the side of the multilayer laminated resin layer facing, and heat-sealed the edge in the longitudinal direction of the folded sheet In addition, a liquid pouch characterized by heat sealing at a predetermined interval in a direction orthogonal to the longitudinal direction, and a plurality of sachets are continuously provided in one direction. Using the laminated sheet for liquid sachets according to any one of claims 1 to 3, the surface on the side of the multilayer laminated resin layer is bent so as to face, heat-sealing the edge in the longitudinal direction, and orthogonal to the longitudinal direction A method for producing a liquid sachet package that heat-seals at a predetermined interval in a direction to fill a liquid sachet in which a plurality of sachets are arranged in one direction,
A long sheet supplying step of continuously supplying the long sheet continuously at a constant speed or intermittently at a constant speed; and
Irradiating a laser beam from the front side or the back side of the long sheet, and printing,
A folding step in which the folded portion is folded in two along the longitudinal direction and overlapped;
A vertical sealing step of heat-sealing a side edge portion facing the bent portion of the long sheet in the longitudinal direction;
A transverse sealing step of heat-sealing the laminated sheet thus laminated at a position corresponding to the bottom in a direction orthogonal to the longitudinal direction;
A filling step of filling the contents of the liquid or viscous body into the bag body having the opening corresponding to the position corresponding to the upper side;
A method for producing a liquid sachet package, comprising sequentially performing a horizontal sealing step of heat-sealing the opening and sealing the upper side.

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