WO2023042499A1 - Film for packaging bag, method for producing same, packaging bag, and method for producing same - Google Patents

Abstract

The method for producing a film for a packaging bag according to the present invention comprises a step for printing halftone on a PET layer S11 and providing a printing layer S14, a step for laminating an NY layer S12 and a PE layer S13 on the PET layer with the printing layer interposed therebetween and forming a laminate film, and a step for irradiating the printing layer in the laminate film with laser light from the PET-layer side and forming linear grooves 15, 25 in the laminate film. Close adhesion between two layers is achieved due to the printing layer including ink distributed in a halftone pattern, and irradiating the halftone-pattern ink with the laser light makes it possible to efficiently generate heat at low light intensity, suppress the generation of fumes, and form linear grooves that are readily torn.

Description

Packaging bag film and its manufacturing method, and packaging bag and its manufacturing method

The present invention relates to a film for packaging bags, a manufacturing method thereof, and a packaging bag and a manufacturing method thereof.

BACKGROUND ART Conventionally, there is known a pouch container (called a packaging bag) which is easily opened by pinching one side end with fingers and tearing it toward the other side, the shoulder portion or the upper end portion of which is easy to open. It is For example, Patent Literature 1 discloses a packaging bag constructed by stacking two laminated films, which are produced by laminating a plurality of films, one on top of the other, and heat-sealing the peripheral edges of the laminated films. Such packaging bags are provided with a fastener (also referred to as a zipper) across the entire width of the opening for releasably containing and storing the contents in powder or other state, and a top end along which the opening can be formed. A linear groove is laser-machined across the entire width of the side to guide tearing.
Patent Document 1: JP-A-2020-124870 Patent Document 2: JP-A-2017-218199

However, even if the laminated film is irradiated with laser light, light absorption is weak, and deep linear grooves that can guide tearing are not formed. On the other hand, as disclosed in Patent Document 2, when a light absorbing material is inserted between two layers in a laminated film and irradiated with a laser beam to generate heat, the interposition of the light absorbing material creates a gap between the two layers. In addition to the weak adhesion and the difficulty of tearing, there is also the problem that the melted film material rises high around the linear grooves due to the strong light absorption and the heat is dispersed over a wide area, resulting in the generation of shoulders.

In a first aspect of the present invention, there is provided a method for manufacturing a packaging bag film that has undergone an easy-opening process, comprising the steps of: providing a printed layer by printing halftone dots on a first layer; laminating one or more second layers on the first layer to form a laminated film; and irradiating the printed layer in the laminated film from the first layer side with light to form linear grooves in the laminated film. and forming a film for a packaging bag.

In a second aspect of the present invention, there is provided a method for manufacturing a packaging bag, wherein the peripheral edge portions of two films for packaging bags manufactured by the method for manufacturing a film for packaging bags of the first aspect are sealed to form a packaging bag. provided.

In a third aspect of the present invention, there is provided a film for packaging bags to which an easy-opening process has been applied, comprising a first layer, a printed layer provided by printing halftone dots on the first layer, and a printed layer A packaging bag comprising a laminated film having one or more second layers laminated on the first layer via There is provided a film for

A fourth aspect of the present invention provides a packaging bag formed by sealing the peripheral edge portions of the two packaging bag films of the third aspect.

It should be noted that the above outline of the invention does not list all the features of the present invention. Subcombinations of these feature groups can also be inventions.

The configuration of the packaging bag according to the present embodiment is shown. The opening of the package is shown. 1 shows the configuration of a packaging bag film (original film) according to the present embodiment. The cross-sectional structure of the film for packaging bags (before easy-open processing) is shown. An example of the arrangement of halftone dots in the print layer is shown. FIG. 3 shows a cross-sectional structure of linear grooves in a dot portion of a halftone dot in the horizontal direction; 3 shows a cross-sectional structure in the horizontal direction of linear grooves in the gaps between halftone dots; 4 shows a cross-sectional structure of a linear groove in the longitudinal direction; 4 shows a cross-sectional structure of linear grooves formed in a uniform print portion; 4 shows a cross-sectional structure of linear grooves in the peripheral portion; 1 shows a production flow of film for packaging bags. 1 shows a schematic configuration of a laser processing machine; An example of linear groove processing by a laser processing machine is shown. 1 shows a schematic configuration of a bag making apparatus; 4 shows the measurement results of the depth distribution of linear grooves in a packaging bag film formed with a laser output of 65%. The state of the linear groove of the film for packaging bags formed with a laser output of 80% is shown. The state of the linear groove of the film for packaging bags formed with a laser output of 70% is shown. The state of the linear groove of the film for packaging bags formed with a laser output of 65% is shown. The state of the linear groove of the film for packaging bags formed with a laser output of 55% is shown. The test result of the opening ease degree of a packaging bag is shown. 4 shows the measurement results of the output of a laser used when forming linear grooves in a film for packaging bags. The results of the initial opening strength measurement of the packaging bag are shown.

Although the present invention will be described below through embodiments of the invention, the following embodiments do not limit the invention according to the scope of claims. Also, not all combinations of features described in the embodiments are essential for the solution of the invention.

FIG. 1 shows the configuration of a packaging bag 1 according to this embodiment. The packaging bag 1 is easy to open by providing linear grooves 15 and 25 over the entire width of the upper end portion side, and tearing along the linear grooves 15 and 25 from one side to the other side to easily open. 1 is a bag-like pouch container that can be used, comprising films 10, 20, 30 and fasteners 31. In FIG. 1 and the like, the left-right direction of the drawing is also called the left-right direction or the horizontal direction, the up-down direction of the drawing is called the up-down direction or the vertical direction, the front side of the drawing is simply called the front side, and the back side of the drawing is simply called the back side.

The films 10 and 20 are flexible laminated films forming the front and back surfaces of the packaging bag 1, respectively. The films 10 and 20 have, for example, a rectangular shape, but the four corners are rounded, and the peripheral edge portions are provided with seal areas for bonding to each other or to the film 30, that is, the left end portions are provided with seal areas for bonding to each other. 18a and 28a, sealing regions 18b and 28b for bonding to each other at the right end, sealing regions 18c and 28c for bonding to each other at the upper end, and sealing regions 18d and 28d for bonding to the film 30 at the lower end. there is Here, the sealing areas 18d and 28d are vertically wide at both left and right ends with respect to the center. In the present embodiment, these boundaries are arranged in a parabolic shape, but they are not limited to this, and may be arranged in a V shape, for example.

The films 10, 20 also include printed areas 14, 24, linear grooves 15, 25, guide grooves 16a, 26a, 16b, 26b, and notches 17a, 17b.

The print areas 14 and 24 are rectangular areas continuously provided over the entire width of the upper end portions of the films 10 and 20 . In the printing regions 14 and 24, a printing layer S14 formed using printing ink is included between any two layers among the plurality of layers forming the films 10 and 20, respectively. Instead of continuously providing the print areas 14 and 24 over the entire width of the films 10 and 20, they may be provided excluding the peripheral edge portion to be heat-sealed, or may be provided intermittently except for a part of the area. may be set to Details of the print layer S14 will be described later.

The linear grooves 15 and 25 are processed grooves provided on the surfaces of the films 10 and 20 to guide tearing of the films 10 and 20 when the packaging bag 1 is opened. are formed respectively. As an example, the linear grooves 15 are linear, and the linear grooves 25 are partially curved. Alternatively, the linear grooves 15 and 25 may be partially curved in different directions. The linear grooves 15, 25 overlap at least at the peripheral edges of the films 10, 20, i.e. the sealing areas 18a, 18b, 28a, 28b. Details of the linear grooves 15 and 25 will be described later.

Guiding grooves 16a, 26a, 16b, 26b are processed grooves provided on the surfaces of the films 10, 20 to assist tearing of the films 10, 20 when the packaging bag 1 is opened. It is curved in a semi-elliptical shape so as to surround notches 17a and 17b and intersect with linear grooves 15 and 25, which will be described later. When the tearing of the films 10, 20 starting from the notches 17a, 17b deviates from the linear grooves 15, 25, it reaches the guide grooves 16a, 26a, 16b, 26b regardless of which direction it deviates, and is guided to them. and can return to the linear grooves 15 and 25.

The notches 17a and 17b are notches for starting tearing of the films 10 and 20, and along the linear grooves 15 and 25 so as to be continuous with the linear grooves 15 and 25 at the left and right ends of the films 10 and 20. formed by The notches 17a, 17b are formed in the sealed areas 18a, 28a and 18b, 28b that are attached to each other, so that the sealing of the packaging bag 1 is maintained.

The film 30 is a flexible laminated film forming the bottom surface of the packaging bag 1. As an example, the film 30 has a rectangular shape, but the four corners are rounded, and the film 30 is folded in a mountain fold with respect to a reference line L30 passing through the center and extending in the horizontal direction. A sealing region 30c is provided to be sealed with the sealing region 18d of the film 20, and a sealing region 30d is provided in the rear half portion to be sealed with the sealing region 28d of the film 20. As shown in FIG. Two sets of semi-circular cutouts 30e for bonding the inner surfaces of the films 10 and 20 to each other are provided at the left and right ends of the sealing regions 30c and 30d.

The fastener 31 is a member that fastens the films 10 and 20 to each other so as to close the opening 1a and seal the inside of the packaging bag 1 after the packaging bag 1 is opened. The fastener 31 has a pair of male and female members each made of resin. One of the male member and the female member is fixed on the inner surface of the upper end portion of the film 10 over the entire width, and the other is fixed on the inner surface of the upper end portion of the film 20 over the entire width. By engaging the male member with the female member and closing the fastener 31, the opening 1a is closed and the inside of the packaging bag 1 is sealed.

The packaging bag 1 is formed using the members described above. It is assumed that the male and female members of fastener 31 are fixed on the inner surfaces of films 10 and 20, respectively. First, the inner surfaces of the films 10 and 20 are opposed to each other, the respective linear grooves 15 and 25 are aligned, the film 30 is folded in half about the reference line L30 with the folded sides facing upward, and one piece is placed on the film 10. , the other piece is inserted between the films 10 and 20 facing the film 20 . Next, the peripheral edges of the films 10, 20, 30, that is, the sealing regions 18a, 28a and 18b, 28b of the films 10, 20, the sealing region 18d of the film 10, the sealing region 30c of the film 30, and the sealing region 28d of the film 20 and the seal area 30d of the film 30 are heat-sealed (heat-sealed). At this time, a part of the sealing region 18d of the film 10 and a part of the sealing region 28d of the film 20 are directly fused through the notch 30e of the film 30. As shown in FIG. Next, notches 17a and 17b are provided on the left and right ends of the sealed films 10 and 20 respectively so as to overlap the linear grooves 15 and 25. As shown in FIG. Finally, the contents are filled from the opening on the upper end side of the packaging bag 1, and the sealing areas 18c, 28c of the films 10, 20 are heat-sealed. As a result, the central region 30a of the film 30 that has been folded in half widens to form a concave bottom surface, and the lower ends of the films 10 and 20 are fixed through the cutouts 30e of the film 30 at the left and right ends, and the left and right central regions are fixed. By spreading to form legs, the packaging bag 1 constitutes a standing pouch that can stand on its own.

The opening 1a of the packaging bag 1 is shown in FIG. When opening the packaging bag 1, the user grasps the left or right end of the packaging bag 1 with fingers and pulls the upper side towards the lower side of the notches 17a and 17b or pushes the notch 17a backward. , 17b and tear the films 10, 20 to the other side along the linear grooves 15, 25 continuing to them. As a result, the upper end portion is cut off from the packaging bag 1 to form an opening 1a, and the packaging bag 1 is opened. Here, while the linear grooves 15 of the film 10 are straight, the central portions of the linear grooves 25 of the film 20 curve downward to the maximum width Δ. Since the opening ends of the films 10 and 20 are shifted by a maximum width Δ at the center, only the film 20 is pinched with fingers, the film 20 is separated from the film 10, and the opening 1a can be easily widened. 31 can be easily opened.

FIG. 3 shows a packaging bag film S that has undergone an easy-opening process according to this embodiment. As an example, the packaging bag film S is formed by arranging a pair of films 10 and 20 constituting one packaging bag 1 in the horizontal direction with their lower ends connected, and by connecting a plurality of pairs of films 10 and 20 to each of the left and right ends. A plurality of pairs of films 10 and 20 are formed by slitting along boundary lines indicated by dashed lines in the drawing. In the manufacturing process of the packaging bag 1, the film S for packaging bags is cut along its center line (broken line) into a film S1 containing only the film 10 and a film S2 containing only the film 20. are cut along the boundary lines (broken lines) to obtain individual films 10 and 20 .

The packaging bag film S includes printed areas 14 and 24 extending in the vertical direction along the left and right ends, linear grooves 15 and 25 continuously provided in the vertical direction in the printed areas 14 and 24, and printed It includes guide grooves 16a, 26a, 16b, 26b respectively provided in the regions 14, 24 near the boundaries (dashed lines) of the films 10, 20 respectively. These configurations are the same as described above, except that they are formed for each of the plurality of regions that partition the plurality of films 10 and 20 .

FIG. 4A shows the cross-sectional structure of the packaging bag film S. Here, in order to explain the basic configuration of the packaging bag film S, a cross-sectional structure in a state before easy-opening processing (a state before the linear grooves 15 and 25 are formed) is shown. The packaging bag film S is a laminated film formed by laminating a PET layer S11, a printed layer S14, an NY layer S12 and a PE layer S13.

The PET layer S11 is an example of the first layer, and is formed with a thickness of 12 μm using polyethylene terephthalate, for example, and has high transparency and non-stretchability. The PET layer S11 is suitable as a base layer for printing. In addition, if the material of the first layer, which is the outermost layer, has such properties, polyester such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), aromatic dicarboxylic acid or aliphatic dicarboxylic acid Condensation products obtained by polymerization from monomers containing diols as constituent components can be used. Among these, PET and PBT are particularly preferred. In addition, you may use the polyamide mentioned later.

The printed layer S14 is an ultra-thin layer provided in the printed regions 14 and 24 on the back surface (lower surface) of the PET layer S11 and sandwiched between the PET layer S11 and the NY layer S12 described later. The printed layer S14 is provided, for example, by gravure-printing halftone dots using white ink containing titanium oxide. Note that printing may be performed using colored ink containing organic manganese, carbon, or the like.

The NY layer S12 is an example of a second layer laminated on the PET layer S11, which is the first layer, via the printed layer S14, and is formed with a thickness of 15 μm using nylon, for example. The NY layer S12 is suitable for ensuring strength that is strong against impact and bending and that makes it difficult to puncture. In addition, the material of the layer constituting the outer layer together with the above-mentioned first layer of the second layer may be polyamide such as nylon 6, nylon 66, nylon 46, nylon 69, nylon 610, nylon 66, nylon 46, nylon 69, nylon 610, nylon 610, nylon 66, nylon 69, nylon 610, Nylon 612, nylon 11, nylon 12, nylon MXD6 and the like can be used. From the viewpoint of ease of handling, nylon 6 or nylon 66 is preferable. In addition, you may use the above-mentioned polyester.

When nylon and polyester are used as materials for forming the outer film of the first layer and the second layer, a biaxially stretched film formed by a tubular method or a tenter method can be used.

The PE layer S13 is an example of the second layer, and is formed of polyethylene with a thickness of 100 to 150 μm, particularly 130 μm in this embodiment, so that the standing pouch can stand on its own when formed. Together, it constitutes a sealant layer suitable for heat sealing by melting at 100 to 130°C. In addition, the material of the innermost layer of the second layer may be a material suitable for heat sealing (heat sealing), such as polyolefin, such as low density, medium density or high density polyethylene, linear low density polyethylene, isotactic polypropylene, syndiotactic polypropylene, ethylene-propylene copolymer, polybutene-1, poly-4-methyl-1-pentene, ethylene-butene-1 copolymer, propylene-butene-1 copolymer, Ethylene-propylene-butene 1 copolymer, ethylene-vinyl acetate copolymer, ion-crosslinked olefin copolymer (ionomer), ethylene-acrylic acid ester copolymer, etc., or a mixture of two or more can do.

In addition, as an example of the second layer, a metal layer (or metal foil) such as aluminum may be provided to block the entry and exit of gases such as oxygen and moisture, and to block the entry of light from the outside. Here, the PET layer S11, the NY layer S12, the metal layer, and the PE layer S13 may be laminated in this order. Alternatively, except for the PET layer S11, the NY layer S12, the metal layer, and the PE layer S13 may be laminated in this order. Also, the PET layer S11, the metal layer, the NY layer S12, and the PE layer S13 may be laminated in this order. Alternatively, except for the NY layer S12, the PET layer S11, the metal layer, and the PE layer S13 may be laminated in this order.

In addition, instead of the metal layer described above, an inorganic material such as silicon oxide, a ceramic such as alumina, or carbon may be deposited by chemical vapor deposition (CVD), a vacuum deposition method, a sputtering method, an ion plating method, or the like. A different vapor deposition layer may be provided. Alternatively, a coating film layer may be provided by coating a barrier resin coating agent composed of polycarboxylic acid-based polymer, vinylidene chloride, ethylene-vinyl alcohol copolymer, or the like.

As the laminated film for the non-heating pouch container, the laminate of the above-mentioned PET layer, NY layer, and PE layer can be used. The PET layer is suitable as a printing layer, the NY layer as a strength ensuring layer, and the PE layer as a heat sealing layer. Here, a transparent barrier (deposited) PET layer may be used instead of the PET layer. The transparent barrier PET layer is obtained by providing a transparent barrier layer on the inner surface side of the PET layer, and is suitable as a printing layer. Also, a stack of NY layers, aluminized PET layers, and PE layers can be used. In such cases, a printed layer is provided on the NY layer. The deposition surface of the PET layer faces the NY layer. A stack of NY and PE layers can also be used. The PET layer is omitted by providing the printed layer on the NY layer. A laminate of PET, NY, aluminum foil, and PE layers can also be used. Aluminum foil may be laminated between the PET layer and the NY layer. A printed layer may be provided on the NY layer to laminate the NY layer, the aluminum foil, and the PE layer.

FIG. 4B shows an example of the arrangement of halftone dots on the printing layer S14. Here, a halftone dot is a set of multiple dots dt. In this embodiment, the halftone dots are, for example, configured by arranging circular dots in a 45-degree inclined square lattice. Here, the dot width d, the distance w between the two most adjacent dots among the plurality of dots dt, the center-to-center distance W (=w+d) between the most adjacent dots, and the distance between the four most adjacent dots Let D be the width of the gap region. As an example, the dot width d is about 120 μm, the spacing w is about 60 μm, the center-to-center distance W is about 180 μm, and the gap region width D is about 120 μm. Note that the size of the spot LS of the laser beam may be set to 240 μm, for example.

Here, the separation distance w is the width H of the linear grooves 15 and 25 and the size of the spot LS of the laser beam used to form the linear grooves 15 and 25 (in this embodiment, the linear grooves 15 and 25 is equal to the spot size of the laser beam). As a result, when the print layer S14 is scanned with a laser beam in any direction including not only the horizontal direction but also the oblique direction, at least one of at least one dot dt among the plurality of dots dt included in the halftone dot is scanned. The linear grooves 15 and 25 can be formed by irradiating the part. As a result, it is possible to adjust the amount of laser light absorption, that is, the amount of heat generated, through the density of halftone dots.

Also, the center-to-center distance W may be less than or equal to the width H of the linear grooves 15 and 25 (the size of the spot LS of the laser light). As a result, when scanning the printed layer S14 with a laser beam in an arbitrary direction, at least one halftone dot dt is irradiated in the direction perpendicular to the scanning direction to form the linear grooves 15 and 25. can do. As a result, it is possible to adjust the amount of laser light absorption, that is, the amount of heat generated, through the distance between the dots dt in the scanning direction, that is, the density of the halftone dots.

It should be noted that the scanning line of the laser beam (that is, the linear groove) is not limited to straight portions, and may include curved portions at least in part. In such cases, the above conditions can be applied to both straight and curved sections. Moreover, the condition may be applied to the direction orthogonal to the scanning direction of the laser light (or the width direction of the linear groove) as follows.

When scanning a laser beam in the horizontal direction of the drawing with respect to halftone dots arranged in a 45-degree inclined square lattice shown in FIG. , the direction orthogonal to the scanning direction of the laser beam or the width direction of the linear groove) may be smaller than the size H of the spot LS of the laser beam. As a result, when scanning the print layer S14 with laser light, at least a portion of at least one dot dt among the plurality of dots dt included in the halftone dot is irradiated to form the linear grooves 15 and 25. be able to. In addition, the center-to-center distance W′ between two adjacent dots in the vertical direction of the drawing (that is, the direction perpendicular to the scanning direction of the laser beam or the width direction of the linear groove) is equal to or smaller than the size H of the spot LS of the laser beam. may be As a result, when scanning the print layer S14 with laser light, at least one halftone dot dt can be irradiated to form the linear grooves 15 and 25 .

It should be noted that the laser light may be scanned not only along a straight line but also curvedly. That is, the linear grooves 15 and 25 may be formed in a curved shape without being limited to a straight shape. In such a case, the separation distance and the center distance between two adjacent dots are defined with respect to the direction perpendicular to the scanning direction of the laser beam (or the width direction of the linear groove) at the position closest to the two dots. good too.

It should be noted that the plurality of dots dt included in the halftone dots are not limited to a circular shape, and may be of any shape such as an ellipse, triangle, quadrangle, rhombus, etc. Dots dt of a plurality of shapes and sizes may be mixed. The arrangement of the plurality of dots dt is not limited to a square lattice, and may be a regular arrangement such as a hexagonal lattice, or an irregular arrangement.

5A and 5B show cross-sectional structures in the horizontal direction of the linear grooves 15 and 25 in the dot portions of the plurality of dots dt forming the halftone dots in the printing layer S14 and the gap portions between the plurality of dots dt (FIG. 5B). 4B) with respect to reference lines AA and BB). By irradiating the printed layer S14 in the laminated film from the PET layer S11 side of the laminated film shown in FIG. , 25 are formed. Here, as shown in FIG. 4B, it is assumed that a plurality of dots dt arranged at regular intervals in the horizontal direction are scanned by moving the spot LS of the laser beam in the horizontal direction with respect to the halftone dot.

As shown in FIG. 5A, in the dot portion of the halftone dot, the dots dt that absorb the laser light generate heat, and the heat melts the PET layer S11 and the NY layer S12 sandwiching the print layer S14. Linear grooves 15 and 25 reaching the surface or near the surface of are formed.

On the other hand, as shown in FIG. 5B, in the interstices of the halftone dots, the laser light is absorbed in the laminated film (particularly the PET layer S11 and the NY layer S12) and generates weak heat, and the small amount of heat causes the PET layer S11 and The NY layer S12 is melted, and the linear grooves 15 and 25 reaching halfway through the NY layer S12 are formed while the PET layer S11 and the NY layer S12 are maintained in close contact with each other. Depending on the intensity of the laser beam and the amount of heat generated in the film, the linear grooves 15 and 25 reaching halfway through the PET layer S11 may be formed while maintaining the PET layer S11 and the NY layer S12 in close contact with each other. There is also

FIG. 5C shows the longitudinal cross-sectional structure of the linear grooves 15 and 25 (cross-sectional structure about the reference line CC in FIG. 4B). The linear grooves 15 and 25 form shallow grooves in which the PET layer S11 and the NY layer S12 are in close contact with each other in the interstices of the halftone dots along the groove direction, and the surface or surface of the PE layer S13 is formed in the dot parts of the halftone dots. A deep hole having the same shape as that of the dot dt is formed. Thereby, the linear grooves 15 and 25 include a plurality of deep holes reaching the surface or near the surface of the PE layer S13 arranged in the groove direction in the shallow groove bottom formed by the PET layer S11 and the NY layer S12 in close contact with each other. As a result, tearing of the films 10 and 20 begins at the deep holes of the dot portions, and tearing of the films 10 and 20 continues at the gaps where the PET layer S11 and the NY layer S12 are in close contact with each other. The films 10, 20 can be easily torn along the grooves 15, 25.

FIG. 5D shows the linear grooves 15 and 25 formed when the printed layer S14 is provided by uniformly printing the insides of the printed regions 14 and 24 using printing ink, and the printed layer S14 is irradiated with laser light. A cross-sectional structure in the lateral direction is shown. When the uniformly printed print layer S14 is irradiated with a laser beam, light absorption is strong, heat is generated excessively, and the heat spreads over a wide area, causing the melted materials of the PET layer S11 and the NY layer S12 in particular to form linear grooves. A wide shoulder S11a is formed on the peripheral edges of 15 and 25.

On the other hand, when halftone dots of the partially printed printing layer S14 are irradiated with laser light, heat is generated by moderate light absorption, and shallow grooves in which the PET layer S11 and the NY layer S12 are in close contact with each other are formed in the gaps between the halftone dots. By forming the linear grooves 15, 25 including the bottoms and partially deep holes in the dot portions of the halftone dots, the films 10, 20 can be easily torn as described above. In this way, by forming the printed layer S14 from halftone dots, it is possible to achieve both adhesion between the films, which is important for easy tearing of the films 10 and 20, and an appropriate amount of heat generation.

FIG. 5E shows the cross-sectional structure of the linear grooves 15, 25 in the peripheral portions, ie, the seal regions 18a, 18b, 28a, 28b. By irradiating the laminated film shown in FIG. 4A with a laser beam from the PET layer S11 side to the printed layer S14 in the laminated film, as shown in FIGS. 5A and 5B, from the PET layer S11 side through the printed layer S14 linear grooves 15 and 25 extending toward the inside of the laminated film are formed. Furthermore, when the packaging bag 1 is formed using the films 10 and 20, the films 10 and 20 are superimposed and the seal regions 18a, 18b, 28a, and 28b are heat-sealed (heat-sealed) to particularly constitute the PE layer S13. The material is melted and filled in the linear grooves 15,25. It should be noted that not only the material constituting the PE layer S13, but also the material constituting the layer that can be melted by heat sealing (heat sealing) may be filled in the linear grooves 15 and 25 together. . As a result, the formation of the linear grooves 15, 25 in the films 10, 20 facilitates the tearing of the packaging bag 1, but there is a possibility that the packaging bag 1 is unintentionally torn, resulting in irregular opening. However, since the linear grooves 15 and 25 are filled with the material of the PE layer S13 in the peripheral portion, the risk of unintended tearing of the packaging bag 1 is sufficiently reduced.

In addition, in order to prevent unintended tearing of the packaging bag 1 as described above, instead of filling the linear grooves 15 and 25 with the film material, the peripheral edges of the packaging bag 1, that is, the films 10 and 20, particularly In the seal areas 18a, 18b, 28a, 28b, for example, the printed areas 14, 24 may not be irradiated with laser light and not subjected to easy-open processing, that is, not formed with linear grooves. In such a case, for example, when the laser beam spot LS scans the peripheral edge portions of the films 10 and 20, a linear groove is not formed in the peripheral edge portion by placing a shutter on the optical path to block the laser beam. You can do it. Alternatively, the peripheral portion is provided with a printing layer S14 containing low-density halftone dots having a smaller number of dots or a smaller dot area than the halftone dots in the inter-peripheral region and a small area ratio of the dot portion to the gap portion. Alternatively, the print layer S14 may not be provided, that is, a region having weaker light absorption than the region between the peripheral portions may be provided in the peripheral portion, and a laser beam may be irradiated to form shallow linear grooves. Alternatively, the interperipheral area may contain halftone dots and the perimeter may be provided with a printed layer containing uniformly printed areas as described below, i. A region having a low degree of adhesion may be provided, and a linear groove that is difficult to tear may be formed by irradiating laser light.

FIG. 6 shows the flow of the manufacturing process S100 of the packaging bag film S subjected to easy-opening processing according to the present embodiment.

In step S101, a printed layer S14 is provided on the PET layer S11, which is the first layer. The printed layer S14 is provided by printing halftone dots with a gravure printer using, for example, white ink containing titanium oxide. Dots are printed using silver ink containing aluminum, aluminum alloy, etc., black ink containing carbon black, graphite, etc., pearly color ink containing mica, iriodine, etc., and brown ink containing iron oxide, etc. You may print.

In step S102, one or more second layers including the NY layer S12 and the like are laminated on the PET layer S11 via the printed layer S14 to form a laminated film. In this embodiment, the second layer includes the NY layer S12 and the PE layer S13. Furthermore, an aluminum layer may be included. Lamination may be performed by dry lamination in which an adhesive is applied to the PET layer S11, the solvent is evaporated in a drying device, and the second layer is thermocompression bonded, or the material of the second layer is melted and extruded into a film shape. Alternatively, an adhesive that does not contain a solvent, such as a thermoplastic urethane-based adhesive, is applied to the PET layer S11, and the second layer is formed thereon by a drying process. Solvent-free lamination (also called solvent-free lamination) may also be used.

In step S103, the laminated film formed in step S102 is cut to form a raw film having a determined width. Here, when a defective portion is detected in the laminated film in the printing process of step S101 and the lamination process of step S102, a flag is inserted into the end of the film. Therefore, the flag may be used as a mark to cut and remove the defective portion, and the divided laminated film may be connected. Further, it may be scattered on the inner surface side in order to improve the slipperiness of the film.

In step S104, the original film formed in step S103 is subjected to an easy-opening process to manufacture the film S for packaging bags. Here, by irradiating the printed layer S14 in the laminated film from the PET layer S11 side with a laser beam, the linear grooves 15 and 25 are formed in the entire width of the laminated film.

A schematic configuration of the laser processing machine 50 is shown in FIG. The laser processing machine 50 is a device that irradiates the raw film (laminated film) formed in step S103 with a laser beam to form the linear grooves 15, 25 and the guide grooves 16a, 16b, 26a, 26b. 51, a reflecting element 52, a condensing optical system 53, a scanning optical system 54, and a winding machine R.

The light source 51 is a light source device that generates laser light, and in this embodiment, a CO ₂ laser is used as an example. The output of the CO ₂ laser is 20 to 30 W, preferably 24 to 30 W, more preferably 27 to 30 W, when the printing layer S14 formed in halftone dots using white ink containing titanium oxide is irradiated with laser light. 28W. As long as the linear grooves 15 and 25 can be formed in the laminated film, that is, as long as the printed layer S14 can be irradiated with light to generate heat, an arbitrary laser light source with an arbitrary wavelength may be employed. Other light sources that emit high-intensity light beams may be used instead of laser light.

The reflective element 52 is an optical element that reflects the laser light and directs it toward the original film. For example, a prism having a mirror element provided on the interface can be employed.

The condensing optical system 53 is an optical system including a lens element for condensing the laser light and forming a spot on the original film.

The scanning optical system 54 is an optical system for scanning the laser light formed by the condensing optical system 53 on the raw film in two-dimensional directions.

A laser beam emitted from a light source 51 is directed toward a raw film through a reflecting element 52, forms a spot on the raw film by a condensing optical system 53, and forms two spots on the raw film by a scanning optical system 54. dimensionally scanned. As a result, the linear grooves 15, 25 and the like are formed in the original film, and the film S for packaging bags is obtained.

The winding machine R is a device that winds the obtained packaging bag film S into a roll. The roll-shaped packaging bag film S wound up by a certain amount is removed from the winding machine R and carried out of the apparatus.

FIG. 8 shows an example of processing of the linear grooves 15 and 25 by the laser processing machine 50. Two laser processing machines 50 are used for the original film shown in FIG. 16b, and the other (referred to as the right laser) forms a linear groove 25 and guiding grooves 26a and 26b in the printing area 24 on the right edge side of the original film. While the original film is fed in the direction of the white arrow by a conveying device (not shown), first, the scanning optical system 54 scans the left laser and the right laser respectively along the semi-elliptical path to scan one side of the films 10 and 20. Guide grooves 16a and 26a are formed at the ends.

Next, the left laser is scanned along a partially curved path while the right laser is scanned along a straight path to form linear grooves 15 and 25 over the entire width of the films 10 and 20, respectively. Here, as described above, the linear grooves 25 are straight, and the linear grooves 15 are partially curved. At this time, the linear grooves 15 and 25 intersect the previously formed guide grooves 16a and 26a.

Finally, the scanning optical system 54 scans the left laser and the right laser respectively along the semi-elliptical paths to form the guide grooves 16b and 26b on the other side ends of the films 10 and 20, respectively. At this time, the guide grooves 16b, 26b intersect with the linear grooves 15, 25 previously formed.

By repeating the formation of the guide grooves 16a, 26a, the linear grooves 15, 25, and the guide grooves 16b, 26b for a plurality of films 10, 20 continuous in the longitudinal direction of the original film, the linear grooves 15, 26b are formed. 25 and guide grooves 16a, 26a, 16b, 26b are formed on the film S for packaging bags.

After forming the film S for packaging bags by subjecting the original film to an easy-opening process in step S104, the film S for packaging bags is wound into a roll by the winding machine R. Here, the packaging bag film S is wound in the direction of the white arrow in FIG. By irradiating the printed layer S14 formed by printing the halftone dots shown in FIG. 4B in the printed regions 14 and 24 with a laser beam, the surface of the packaging bag film S is changed as shown in FIGS. 5A and 5B. is less likely to bulge around the linear grooves 15 and 25 (shoulder is less likely to occur), so that a roll of the packaging bag film S with less irregularities on the surface and less wrinkles can be obtained.

The packaging bag film S wound into a roll is transported to the bag making device 60 . Here, the packaging bag film S may be transported to the bag making apparatus 60 after being stored for a certain period of time.

In step S200, the roll-shaped packaging bag film S formed in step S104 is used to form a bag by sealing the periphery to form the packaging bag 1. Step S<b>200 may be performed following the manufacturing process S<b>100 of the film S for packaging bags, or may be performed after some time.

FIG. 9 shows a schematic configuration of the bag making device 60. The bag-making device 60 is a device that executes the bag-making process S200, and may be installed together with the device system that carries out the manufacturing process S100 of the packaging bag film S including the laser processing machine 50, or may be installed remotely independently. may The bag making device 60 includes a cutting machine 62 , a fastener attaching device 61 , a heat sealing machine 63 , a notch cutter 64 and a cutting machine 65 .

The cutting machine 62 unwinds the film from the roll-shaped film S for packaging bags, and cuts the film S for packaging bags along the center line (broken line in the middle in FIG. It is divided into a film S2 containing only.

The fastener attachment device 61 fixes the male member and female member forming the fastener 31 on the inner surfaces of the films 10 and 20 included in the films S1 and S2, respectively. The films S1 and S2 are carried out in a state in which they are overlapped so that their inner surfaces face each other. At this time, the linear grooves 15 and 25 of the films 10 and 20 are overlapped at least at the peripheral edges.

The heat-sealing machine 63 inserts the film 30 folded in two between the films S1 and S2 that are superimposed, and heat-seals (heat-seals) the peripheral portions of each. As a result, the sealed regions 18a, 28a and the sealed regions 18b, 28b of the individual films 10, 20 included in the films S1, S2 are heat-sealed, respectively, and the sealed region 18d of the film 10 and the sealed region 30c of the film 30, The seal area 28d of the film 20 and the seal area 30d of the film 30 are heat sealed respectively. As a result, the packaging bag 1 is formed with its upper end opened. At this time, the linear grooves 15, 25 of the films 10, 20 in the sealing regions 18a, 28a, 18b, 28b are filled with the material of the PE layer forming the second layer. As a result, as described above, unintended tearing of the packaging bag 1 can be suppressed.

The notch cutter 64 provides notches 17a, 17b overlapping the linear grooves 15, 25 at the ends of the individual films 10, 20 included in the sealed films S1, S2. That is, notches 17a and 17b are formed along the linear grooves 15 and 25 in the films 10 and 20 in the peripheral edge portion.

The cutting machine 65 cuts the sealed films S1 and S2, separates the continuous films 10 and 20, and forms the packaging bags 1 each having an open upper end.

The packaging bag 1 is carried out from the bag making device 60. After that, the contents are filled from the opening of the packaging bag 1, and the inside of the packaging bag 1 is sealed by heat-sealing the sealing regions 18c, 28c of the films 10, 20. FIG.

10 and 11A to 11D show the state of the linear grooves formed in the film S for packaging bags. Here, a printing layer S14 containing halftone dots is provided in the printing regions 14 and 24 using printing ink, and linear grooves 25 (left) are formed by irradiating the layer with laser light. A linear groove 25 (right) formed by providing a printed layer S14 and irradiating it with a laser beam is compared. White ink containing titanium oxide was used as printing ink. The configuration of halftone dots is as shown in FIG. 4B. The laser processing machine 50 used the right laser (CO ₂ laser) of the two laser processing machines 50 . Laser power calibration is shown in FIG. The transportation speed of the packaging bag film S was set at 20 m/min, and the scanning speed of the laser light was set at 1600 mm/sec.

FIG. 10 shows the measurement result of the depth distribution of the linear grooves of the packaging bag film S formed with a laser output of 65%. In the case of uniform printing (right), light absorption by the printed layer is strong, excessively strong heat is generated, and the heat spreads over a wide area, forming deep linear grooves. It can be seen that there is a high rise at the periphery of the linear groove and a wide shoulder is generated. On the other hand, in the case of halftone dots (left), the dot part of the halftone dot of the printing layer strongly heats up due to light absorption, and the heat spreads to form a deep hole, and the gap part of the halftone dot weakens due to light absorption. A shallow bottom is formed by generating heat and spreading the heat only in a narrow area. Here, the melted materials of the PET layer and the NY layer slightly protrude along the periphery of the linear groove to form a narrow shoulder. It can be seen that the shoulder is low compared to the case of uniform printing.

FIG. 11A shows an enlarged image of linear grooves formed with a laser output of 80%. In the case of uniform printing (right), light absorption by the printing layer is strong, excessively strong heat is generated, and the heat spreads over a wide area, forming deep linear grooves, the bottom of which is the PE layer (black part in the center). However, it can be seen that the melted materials of the PET layer and the NY layer are highly protuberant on the periphery of the linear groove to form wide shoulders (upper and lower white portions). It should be noted that the width of the groove portion is narrow due to the relatively wide shoulder. On the other hand, in the case of halftone dots (left), the dot part of the halftone dot in the printing layer strongly heats up due to light absorption, and the heat spreads to form a deep hole reaching the PE layer, and the gap part of the halftone dot becomes Light absorption causes weak heat generation, and the heat spreads only in a narrow range, thereby maintaining the state in which the PET layer and the NY layer are in close contact with each other to form a shallow bottom. Here, the melted materials of the PET layer and the NY layer slightly protrude along the peripheral edges of the linear grooves to form narrow shoulders (upper and lower white portions). Compared to the uniform print case (right), the shoulder is relatively narrow, resulting in a wide groove.

FIG. 11B shows an enlarged image of linear grooves formed with a laser output of 70%. In the case of uniform printing (right), compared to the case of 80% output, the light absorption by the printed layer is weaker, and the generated heat does not spread over a wide area. Although narrow, the linear grooves are also formed relatively shallow. On the other hand, in the case of halftone dots (left), compared with the case of 80% output, the linear grooves are formed shallower (less black portions) and narrower due to the weaker light absorption by the printed layer. However, as in the case of 80% output, the dot part of the halftone dot of the printing layer strongly heats up due to light absorption, and the heat spreads to form a deep hole reaching to the PE layer, and the gap part of the halftone dot becomes The PET layer and the NY layer are kept in close contact with each other to form a shallow bottom by weakly generating heat due to light absorption and spreading the heat only in a narrow range.

FIG. 11C shows an enlarged image of linear grooves formed with a laser output of 65%. In the case of uniform printing (right), compared with the case of 70% output, the linear grooves are shallower and narrower due to the weaker light absorption by the printed layer. On the other hand, in the case of halftone dots (left), as compared with the case of 70% output, the linear grooves are formed shallower (less black portions) and narrower due to the weaker light absorption by the printed layer. However, as in the case of 70% output, deep holes are formed in the dot portions of the halftone dots of the printing layer, and the PET layer and the NY layer maintain a state in which the PET layer and the NY layer are in close contact with each other, and shallow bottoms are formed in the interstices of the halftone dots. forming.

FIG. 11D shows an enlarged image of linear grooves formed by irradiating a printed layer containing halftone dots with laser light at an output of 55%. Compared to the case of 65% output, the light absorption by the printed layer is further weakened, so the linear grooves are formed shallower (less black portions) and narrower. However, it can be seen that the linear groove structure described above is maintained.

Fig. 12 shows the test results of the ease of opening the packaging bag. As described above, in the case where the printing layer S14 including halftone dots is provided in the printing regions 14 and 24 using printing ink, and in the case where the printing layer S14 is provided by uniform printing, the laser beam is applied to the printing layer S14. A packaging bag 1 is formed using the film S for packaging bags in which linear grooves 15 and 25 are formed by irradiating , the end of the packaging bag 1 is pinched with fingers, and linear grooves 15 are formed from notches 17a or 17b. , 25, the films 10, 20 are torn to the other side, and the packaging bag 1 is opened. Here, when opening the packaging bag 1, the left or right end of the packaging bag 1 is pinched with fingers, and the upper side is pulled forward or pushed backward from the lower side of the notch 17a or 17b. Each was tested 10 times. It succeeds when the films 10 and 20 are torn to the other end and the packaging bag 1 can be opened, and fails when the films 10 and 20 cannot be torn to the other end and the opening of the packaging bag 1 stops halfway. Then, the unsealing success rate was calculated with respect to the laser output for each of halftone dots and uniform printing.

In the case of uniform printing, when the laser output is 80 to 90%, the films 10 and 20 can be easily torn because the linear grooves 15 and 25 are deeply formed, and the unsealing success rate is as high as about 90%. However, when the laser output is as low as 65 to 75%, heat is generated strongly, but it is dispersed over a wide range, forming shallow and wide linear grooves. The presence of S14 weakens the degree of adhesion between them, making it difficult to tear the films 10 and 20, and the opening success rate drops to about 60%.

On the other hand, in the case of halftone dots, at a laser output of 55 to 90%, the dot portions of the halftone dots of the printing layer strongly generate heat due to light absorption, and the heat spreads to form deep holes reaching the PE layer. The interstices between the halftone dots weakly generate heat due to light absorption, and the heat spreads only in a narrow range, so that the PET layer and the NY layer are maintained in close contact with each other to form a shallow bottom. The tearing of the films 10 and 20 starts at the deep holes of the dot portions, and the tearing of the films 10 and 20 continues at the gaps where the PET layer S11 and the NY layer S12 are in close contact with each other. By repeating to the other end, tearing of the films 10 and 20 becomes easy, and the opening success rate is as high as 80% or more.

FIG. 13 shows the measurement results (calibration) of the laser output used when forming the linear grooves 15 and 25 of the film S for packaging bags described above. The laser power of 55 to 90% that achieves an unsealing success rate of 80% or more in the case of halftone dots corresponds to at least 20 to 30W. The laser power of 65 to 90% that achieves a successful opening rate of 100% or more in the case of halftone dots corresponds to at least 24 to 30W. A laser power of 75-85% is preferable for stable use of the laser processing machine, which corresponds to at least 27-28W.

Fig. 14 shows the results of the initial opening strength measurement of the packaging bag.

The packaging bags according to the examples (Examples 1 to 5) are manufactured in the order of printing S101, laminating S102, slitting S103, easy-open processing S104, and bag making S200 according to the manufacturing method of the packaging bag 1 according to the above-described embodiment. bottom. In the printing S101, the printing layer S12 was provided by gravure-printing halftone dots using white ink containing titanium oxide on the inner surface side of the PET layer S11 (that is, the NY layer S12 side). In lamination S102, a laminated film was formed using a PET layer S11 with a thickness of 12 μm, a NY layer S12 with a thickness of 15 μm, and a PE layer S13 with a thickness of 130 μm. In the easy-open processing S104, the print layer was irradiated with a 25 W CO ₂ laser beam to form linear grooves in the laminated film. In bag-making S200, the laminated film is heat-sealed at the periphery to form a packaging bag. At this time, the linear grooves 15 and 25 in the peripheral portion are filled with the material of the NY layer S12 and the PE layer S13, especially the material of the PE layer S13 forming the sealant layer (see FIG. 5E).

The packaging bags according to the comparative examples (Comparative Examples 1 to 5) were manufactured in the order of printing S101, laminating S102, slitting S103, bag making S200, and easy-opening processing S104. In the printing S101, the printing layer S12 was provided by gravure-printing halftone dots using white ink containing titanium oxide on the inner surface side of the PET layer S11 (that is, the NY layer S12 side). In lamination S102, a laminated film was formed using a PET layer S11 with a thickness of 12 μm, a NY layer S12 with a thickness of 15 μm, and a PE layer S13 with a thickness of 130 μm. In bag-making S200, the laminated film is heat-sealed at the periphery to form a packaging bag. In the easy-open processing S104, the printed layer was irradiated with a 25 W CO ₂ laser beam to form linear grooves in the laminated films on both sides of the packaging bag 1, respectively. Since the easy-opening processing S104 was performed after the bag making S200, unlike the packaging bag according to the example, the linear grooves 15 and 25 in the peripheral edge portion of the package according to the comparative example were not filled with anything.

The initial opening strength was measured for each of the packaging bags according to the examples (Examples 1 to 5) and the packaging bags according to the comparative examples (Comparative Examples 1 to 5). In the initial opening strength measurement, the upper part of the packaging bag is chucked in a push-pull gauge (DS2-200N, Imada Co., Ltd.), the lower part of the packaging bag is fixed, and the chuck is moved from left to right at a speed of 3000 mm / min. Measure the load applied to the chuck while tearing the packaging bag with a push-pull gauge, stop tearing after the tear passes the peripheral edge (seal area 18a, 28a), and measure the maximum applied to the chuck during tearing from the push-pull gauge. Read load. The maximum load of the packaging bags according to Examples 1-5 was 12.18 N on average, and the maximum load of the packaging bags according to Comparative Examples 1-5 was 10.98 N on average. In the packaging bag according to the example, the linear grooves 15 and 25 in the peripheral portion are filled with the material of the PE layer S13 forming the sealant layer, thereby increasing the initial opening strength, thereby suppressing the start of irregular tearing. becomes possible. It is also possible to prevent delamination of the laminate film when providing the notches 17a, 17b along the linear grooves 15, 25 filled with the material of the PE layer S13.

The manufacturing method of the film S for packaging bags according to the present embodiment includes the step of printing halftone dots on the PET layer S11 to provide the printing layer S14, and the NY layer S12 and the PE layer on the PET layer S11 via the printing layer S14. A step of laminating S13 to form a laminated film, and a step of irradiating laser light to the printed layer S14 in the laminated film from the PET layer S11 side to form linear grooves 15 and 25 in the laminated film. According to this, by irradiating the printed layer S14 superimposed in the laminated film with a laser beam, the dots that absorb the laser beam among the plurality of dots forming the halftone dots of the printed layer S14 generate heat. Due to this, the layers sandwiching the printed layer S14 are melted to form linear grooves 15 and 25 in the laminated film. Here, since the printing layer S14 contains the printing ink distributed in the form of halftone dots, adhesion between the two layers sandwiching this can be obtained. It is possible to form the linear grooves 15 and 25 which can be easily torn in the packaging bag film S by efficiently generating heat with strength and suppressing generation of fumes.

Here, when the unprinted area is irradiated with light, light absorption is weak and heat generation is weak, so that the linear grooves are formed shallow and the films 10 and 20 are difficult to tear. The adhesion between the PET layer S11 and the NY layer S12 sandwiching the is weak and it becomes difficult to tear. On the other hand, when partially printed halftone dots are irradiated with a laser beam, heat is generated due to moderate light absorption. The layer S12 adheres tightly, and deep linear grooves are partially formed in the dot portions, making it easy to tear. Therefore, the method for manufacturing the film S for packaging bags according to the present embodiment can efficiently process the film S for packaging bags by using a low-intensity laser beam, suppressing the amount of fumes generated, and processing the film S for easy opening. Become.

In addition, the method for manufacturing the packaging bag 1 according to the present embodiment forms the packaging bag 1 by sealing the peripheral edge portions of the two films 10 and 20 manufactured by the method for manufacturing the film S for packaging bags described above. Here, since the print layer S14 provided in the print areas 14 and 24 is formed in a halftone dot pattern, one of the films 10 and 20 can be printed on the other side through the print area 14 or 24 of the other film. By visually checking the films of , the displacement between the front and back films 10 and 20 can be confirmed.

In addition, the film S for packaging bags according to the present embodiment is laminated on the PET layer S11 via the PET layer S11, the printed layer S14 provided by printing halftone dots on the PET layer S11, and the printed layer S14. A laminated film having an NY layer S12 and a PE layer S13 is provided, and linear grooves 15 and 25 are formed in the laminated film from the PET layer S11 side through the printed layer S14. Here, the linear grooves 15 and 25 include a plurality of holes extending to the surface of the PE layer arranged in the groove direction in shallow groove bottoms where the PET layer S11 and the NY layer S12 are in close contact with each other. As a result, tearing of the films 10 and 20 starts at the hole portion of the dot portion, and the tearing of the films 10 and 20 continues at the gap portion where the PET layer S11 and the NY layer S12 are in close contact with each other. The films 10, 20 can be easily torn along the grooves 15, 25. Here, even if the linear grooves 15 and 25 are long, and even if the linear grooves 15 of the film 10 and the linear grooves 25 of the film 10 are partially misaligned, the inner layer of the films 10 and 20, that is, the PE layer Even if S13 is thick, the films 10 and 20 can be easily torn along the linear grooves 15 and 25.例文帳に追加

Further, the packaging bag 1 according to the present embodiment is formed by sealing the periphery of the packaging bag film S described above.

The packaging bag film S according to the present embodiment is produced by arranging a pair of films 10 and 20 constituting one packaging bag 1 side by side and connecting a plurality of pairs of films 10 and 20 to each other at their side ends. Although it is assumed to include it continuously, it is not limited to this, and only one of the pair of films 10 and 20 may be included continuously, or a plurality of pairs of films 10 and 20 are arranged side by side and a plurality of pairs of films 10 and 20 are arranged. The films 10, 20 may be continuous with their respective side edges connected to each other.

In the packaging bag 1 according to this embodiment, the linear grooves 15 and 25 are provided over the entire width of the films 10 and 20 in the left-right direction. may be provided with linear grooves. Moreover, the linear grooves 15 and 25 may be provided in a curved line shape instead of in a straight line shape.

In addition, in the packaging bag 1 according to the present embodiment, the notches 17a and 17b are provided at both ends in the left-right direction of the films 10 and 20, but they may be provided at only one end.

In the method for manufacturing the film S for packaging bags according to the present embodiment, at the end of the manufacturing step S100, that is, before the bag-making step S200, the film S for packaging bags is irradiated with a laser beam for easy-open processing. However, instead of this, in the bag-making step S200, for example, the films 10, 20, and 30 are heat-sealed by the heat-sealing machine 63 to form the packaging bag 1 with the upper end opened, and then the cutting machine 65 Before the packaging bag 1 is divided into individual packaging bags 1, the packaging bag 1 may be irradiated with a laser beam for easy opening processing. In such a case, in order to prevent irregular opening, the sealing areas 18a, 18b, 28a, 28b of the packaging bag 1 may be removed and subjected to an easy-opening process.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

The execution order of each process such as actions, procedures, steps, and stages in devices, systems, programs, and methods shown in claims, specifications, and drawings is etc., and it should be noted that they can be implemented in any order unless the output of a previous process is used in a later process. Regarding the operation flow in the claims, specification, and drawings, even if explanations are made using "first," "next," etc. for the sake of convenience, it means that it is essential to carry out in this order. isn't it.

According to this specification, configurations described in the following items are also disclosed.
[Item 1] A method for manufacturing a packaging bag film subjected to an easy-opening process, comprising: providing a printed layer by printing halftone dots on a first layer; laminating one or more second layers on top to form a laminated film; and irradiating the printed layer in the laminated film from the first layer side with light to form linear grooves in the laminated film. A method for producing a film for packaging bags, comprising: forming.
[Item 2] The halftone dot is a set of a plurality of dots, and the distance between two adjacent dots among the plurality of dots in a direction perpendicular to the scanning direction of the light is the spot size of the light. The method for manufacturing the packaging bag film according to item 1, which is smaller.
[Item 3] The packaging bag according to item 2, wherein a center-to-center distance between two adjacent dots among the plurality of dots in a direction perpendicular to the scanning direction of the light is equal to or smaller than the spot size of the light. Film production method.
[Item 4] The method for producing a film for packaging bags according to item 1, wherein the linear grooves are deeper at the positions of the dots than in the regions between the dots of the halftone dots.
[Item 5] Item 1, wherein printing is performed using a printing ink containing titanium oxide in the step of providing the printing layer, and a CO ₂ laser beam of 20 to 30 W is used in the step of forming the linear grooves. A method for producing a film for packaging bags.
[Item 6] The method for producing a film for packaging bags according to item 1, further comprising the step of rolling the laminated film after the step of forming the linear grooves.
[Item 7] A method for manufacturing a packaging bag, wherein the film for packaging bags manufactured by the method for manufacturing a film for packaging bags according to any one of Items 1 to 6 is sealed at the periphery to form a packaging bag.
[Item 8] The linear grooves of the film for packaging bags located on one surface of the packaging bag are linear, and the other linear grooves of the film for packaging bags located on the other surface are linear. The manufacturing method of the packaging bag according to item 7, wherein the packaging bag is partially curved.
[Item 9] At least one of the linear groove and another linear groove of the film for packaging bags is filled with the material of any one of the one or more second layers at the peripheral edge portion. A method for manufacturing the packaging bag according to item 7.
[Item 10] A packaging bag film to which an easy-opening process has been applied, comprising: a first layer; a printed layer provided by printing halftone dots on the first layer; A packaging bag comprising a laminated film having one or more second layers laminated on a first layer, wherein linear grooves are formed in the laminated film from the first layer side through the printed layer. Film for.
[Item 11] The halftone dot is a set of a plurality of dots, and the distance between two adjacent dots among the plurality of dots in the width direction of the linear groove is greater than the width of the linear groove. The film for packaging bags according to item 10, which is small.
[Item 12] The packaging bag film according to item 11, wherein a center-to-center distance between two adjacent dots among the plurality of dots in the width direction of the linear groove is equal to or less than the width of the linear groove. .
[Item 13] A packaging bag film according to item 10, wherein the linear groove includes a plurality of deep portions.
[Item 14] A packaging bag formed using the packaging bag film according to any one of Items 10 to 13.
[Item 15] The packaging bag according to Item 14, wherein the linear groove formed on one surface of the packaging bag is linear, and the linear groove formed on the other surface is partially curved.
[Item 16] The packaging bag according to Item 14, wherein the linear groove formed in the packaging bag is filled with the material of at least one of the one or more second layers in the peripheral edge seal portion.
[Item 17] A method for manufacturing a packaging bag subjected to an easy-opening process, comprising: forming a laminated film by laminating one or more second layers on a first layer; forming a linear groove in the first layer; sealing the laminated film at the peripheral portion to form a packaging bag; filling with the material of any of the layers of.
[Item 18] A method for manufacturing a packaging bag according to Item 17, further comprising forming a notch in the packaging bag along the linear groove in the peripheral portion.
[Item 19] A method for manufacturing a packaging bag according to item 17, further comprising the step of printing halftone dots on the first layer to provide a printed layer prior to the step of forming the laminated film.
[Item 20] In the step of providing the printed layer, printing is performed using a printing ink containing titanium oxide, and in the step of forming the linear grooves, a CO ₂ laser beam of 20 to 30 W is used to print the first layer side. 20. The method of manufacturing a packaging bag according to item 19, wherein the printed layer in the laminated film is irradiated with light to form the linear grooves.
[Item 21] The linear groove of the laminated film located on one surface of the packaging bag is linear, and another linear groove of the laminated film located on the other surface is partially curved. 18. A method for manufacturing a packaging bag according to item 17.
[Item 22] The linear groove of the laminated film located on one surface of the packaging bag and another linear groove of the laminated film located on the other surface overlap at least at the peripheral edge. 18. The method for manufacturing the packaging bag according to 17.
[Item 23] A method for manufacturing a packaging bag according to item 17, wherein the linear groove is filled with a material for a sealant layer of the one or more second layers.
[Item 24] A packaging bag subjected to an easy-opening process, comprising a first layer and one or more second layers laminated on the first layer, wherein a wire is formed on the first layer side. At least one side of the laminated film is provided with a laminated film in which a groove is formed, and the linear groove of the laminated film is filled with the material of any one of the one or more second layers within the sealed peripheral edge. There is a packaging bag.
[Item 25] The packaging bag according to item 24, including a notch formed along the linear groove in the peripheral portion.
[Item 26] The packaging bag according to Item 24, wherein the laminated film further has a printed layer formed by printing halftone dots on the first layer.
[Item 27] The linear groove of the laminated film located on one surface of the packaging bag is linear, and another linear groove of the laminated film located on the other surface is partially curved. 25. A packaging bag according to item 24.
[Item 28] The linear groove of the laminated film located on one surface of the packaging bag and another linear groove of the laminated film located on the other surface overlap at least at the peripheral edge. 24. The packaging bag according to 24.
[Item 29] The packaging bag according to item 24, wherein the linear groove is filled with a material for a sealant layer of the one or more second layers.
[Item 30] A method for manufacturing a film for packaging bags subjected to an easy-opening process, comprising: providing a printed layer on a first layer; A step of laminating a second layer to form a laminated film, wherein the laminated film includes at the periphery a region of weak light absorption with respect to the inter-periphery region or at the periphery with respect to the inter-periphery region and including a region with low adhesion between the first layer and the one or more second layers, and irradiating the printed layer in the laminated film from the first layer side with light, and forming linear grooves in a laminated film.
[Item 31] In the step of providing the printed layer, halftone dots are printed on the first layer to provide the printed layer, and the printed layer has a lower density in the peripheral portion than in the inter-peripheral region. 31. The method for producing a film for packaging bags according to item 30, comprising halftone dots of
[Item 32] Item 30, wherein in the step of providing the printed layer, halftone dots are printed in the region between the peripheral edges on the first layer, and printed uniformly on the peripheral edge to provide the printed layer. A method for producing a film for packaging bags.
[Item 33] Item 30, wherein printing is performed using a printing ink containing titanium oxide in the step of providing the printing layer, and a CO ₂ laser beam of 20 to 30 W is used in the step of forming the linear grooves. A method for producing a film for packaging bags.
[Item 34] A method for manufacturing a film for packaging bags according to Item 30, further comprising a step of rolling the laminated film after the step of forming the linear grooves.
[Item 35] A packaging bag comprising a step of sealing the film for packaging bags produced by the method for producing a film for packaging bags according to any one of Items 30 to 34 at the peripheral portion to form a packaging bag. manufacturing method.
[Item 36] A method for manufacturing a packaging bag according to item 35, further comprising forming a notch along the linear groove in the peripheral portion.
[Item 37] The linear grooves of the film for packaging bags located on one surface of the packaging bag are linear, and the other linear grooves of the film for packaging bags located on the other surface are linear. 36. A method for manufacturing a packaging bag according to item 35, wherein the packaging bag is partially curved.
[Item 38] The linear groove of the film for packaging bags located on one surface of the packaging bag and the another linear groove of the film for packaging bags located on the other surface are at least the peripheral edge portion 36. A method for manufacturing a packaging bag according to item 35, wherein
[Item 39] A packaging bag film to which an easy-opening process has been applied, comprising a first layer, a printed layer provided on the first layer, and laminated on the first layer via the printed layer and one or more second layers, and include at the periphery a region of weak light absorption with respect to the inter-periphery region or at the periphery with respect to the inter-periphery region the first layer and the A packaging bag comprising a laminated film including a region of low adhesion between one or more second layers, wherein linear grooves are formed in the laminated film from the first layer side through the printed layer. the film.
[Item 40] Item 39, wherein the printed layer is provided by printing halftone dots on the first layer, and the peripheral portion includes halftone dots having a lower density than the inter-peripheral region. film for packaging bags.
[Item 41] The film for packaging bags according to Item 39, wherein the printed layer is provided by printing halftone dots in the region between the peripheral edges on the first layer and printing the dots uniformly on the peripheral edge.
[Item 42] A packaging bag formed using the packaging bag film according to any one of Items 39 to 41.
[Item 43] The packaging bag according to item 42, including a notch formed along the linear groove in the peripheral portion.
[Item 44] The linear groove of the film for packaging bags located on one surface of the packaging bag is linear, and the other linear groove of the film for packaging bags located on the other surface is linear. 43. The packaging bag according to item 42, which is partially curved.
[Item 45] The linear groove of the laminated film located on one surface of the packaging bag and another linear groove of the laminated film located on the other surface overlap at least at the peripheral edge. 42. The packaging bag according to 42.

REFERENCE SIGNS LIST 1 packaging bag 1a opening 10, 20, 30 film 14, 24 printing area 15, 25 linear groove 16a, 16b, 26a, 26b guide groove 17a, 17b notch, 18a, 18b, 18c, 18d, 28a, 28b, 28c, 28d...seal area, 30a...central area, 30c, 30d...seal area, 30e...notch, 31...fastener, 50...laser processing machine, 51...light source, 52... Reflective element, 53... Condensing optical system, 54... Scanning optical system, 60... Bag making device, 61... Fastener attachment device, 62... Cutting machine, 63... Heat sealing machine, 64... Notch cutter, 65... Cutting machine, L30...reference line, LS...spot, R...winding machine, S...packaging bag film, S1, S2...film, S100...packaging bag film manufacturing process, S11...PET layer, S11a...shoulder, S12...NY Layer, S13... PE layer, S14... Printed layer, S200... Bag-making process.

Claims (18)

1. A method for manufacturing a film for packaging bags subjected to an easy-opening process, comprising:
   providing a printed layer by printing halftone dots on the first layer;
   laminating one or more second layers on the first layer via the printed layer to form a laminated film;
   irradiating the printed layer in the laminated film with light from the first layer side to form linear grooves in the laminated film;
   A method for manufacturing a film for packaging bags.
2. The halftone dot is a set of a plurality of dots, and a distance between two adjacent dots among the plurality of dots in a direction perpendicular to the scanning direction of the light is smaller than a spot size of the light. Item 1. A method for producing a film for packaging bags according to Item 1.
3. 3. Manufacture of a film for packaging bags according to claim 2, wherein a center-to-center distance between two adjacent dots among the plurality of dots in a direction orthogonal to the scanning direction of the light is equal to or less than the spot size of the light. Method.
4. The method for manufacturing a film for packaging bags according to any one of claims 1 to 3, wherein the linear grooves are deeper at the positions of the dots than the regions between the dots of the halftone dots.
5. In the step of providing the printing layer, printing is performed using printing ink containing titanium oxide,
   The method for producing a film for packaging bags according to any one of claims 1 to 4, wherein a CO ₂ laser beam of 20 to 30 W is used in the step of forming the linear grooves.
6. The method for manufacturing a packaging bag film according to any one of claims 1 to 5, further comprising a step of rolling the laminated film after the step of forming the linear grooves.
7. A method for manufacturing a packaging bag, wherein the film for packaging bags manufactured by the method for manufacturing a film for packaging bags according to any one of claims 1 to 6 is sealed at the periphery to form a packaging bag.
8. The linear groove of the film for packaging bags located on one surface of the packaging bag is linear, and another linear groove of the film for packaging bags located on the other surface is partially curved. The manufacturing method of the packaging bag according to claim 7.
9. 8. At least one of the linear groove and another linear groove of the film for packaging bags is filled with the material of any one of the one or more second layers at the peripheral edge portion, or 9. The method for manufacturing the packaging bag according to 8.
10. A packaging bag film that has undergone an easy-opening process,
    A laminate having a first layer, a printed layer provided by printing halftone dots on the first layer, and one or more second layers laminated on the first layer via the printed layer equipped with a film,
    A film for a packaging bag, wherein linear grooves are formed in the laminated film from the first layer side through the printed layer.
11. 3. The halftone dot is a set of a plurality of dots, and the separation distance between two adjacent dots among the plurality of dots in the width direction of the linear groove is smaller than the width of the linear groove. 11. The film for packaging bags according to 10.
12. 12. The film for packaging bags according to claim 11, wherein a center-to-center distance between two adjacent dots among the plurality of dots in the width direction of the linear groove is equal to or less than the width of the linear groove.
13. The film for packaging bags according to any one of claims 10 to 12, wherein the linear groove includes a plurality of deep portions.
14. A packaging bag formed using the packaging bag film according to any one of claims 10 to 13.
15. The packaging bag according to claim 14, wherein the linear grooves formed on one surface of the packaging bag are linear, and the linear grooves formed on the other surface are partially curved.
16. The packaging bag according to claim 14 or 15, wherein the linear groove formed in the packaging bag is filled with the material of at least one of the one or more second layers at the peripheral edge seal portion.
17. A method for manufacturing a packaging bag subjected to easy-open processing,
    laminating one or more second layers onto the first layer to form a laminated film;
    forming linear grooves on the first layer side of the laminated film;
    Sealing the laminated film at the periphery to form a packaging bag, and filling linear grooves of the laminated film within the periphery with the material of any one of the one or more second layers. and,
    A method of manufacturing a packaging bag comprising
18. A packaging bag subjected to an easy-opening process,
    A laminated film having a first layer and one or more second layers laminated on the first layer and having linear grooves formed on the first layer side is provided on at least one side,
    A packaging bag, wherein the linear grooves of the laminated film are filled with the material of any one of the one or more second layers within the sealed peripheral portion.

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