TW202311125A - 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

Film for packaging bag and method for producing the same, and packaging bag and method for producing the same

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

There has been known a small bag (pouch) container (referred to as a packaging bag), which is provided with an easy-opening process on the shoulder or upper end, and is torn by pinching one end with fingers and tearing toward the other side. , and can be easily unsealed. For example, Patent Document 1 discloses a packaging bag which is formed by laminating two layers of laminated films and heat-sealing the periphery. The laminated film is formed by laminating a plurality of films. Such a packaging bag is provided with a fastener (also called a clip chain (zipper)) on the entire width of the opening in order to accommodate and store the powder and other contents in a state that can be taken out. In the method of forming the opening of the fastener, laser processing is performed on the entire width of the upper end side to provide linear grooves to guide tearing. Patent Document 1: Japanese Patent Laid-Open No. 2020-124870. Patent Document 2: Japanese Patent Laid-Open No. 2017-218199.

[Problem to be solved by the invention] However, even if the laminated film is irradiated with laser light, the light absorption is still weak and it is impossible to form deep linear grooves that can guide tearing. On the other hand, as disclosed in Patent Document 2, if a light-absorbing material is inserted between two layers in a laminated film and irradiated with laser light to cause heat release, not only will the two layers be separated by the light-absorbing material The adhesion between them becomes weak and it is difficult to tear, and there are also the following problems: due to the strong light absorption, the heat will be dispersed in a wide range, and the film material melted around the linear groove will bulge high, resulting in a shoulder. (shoulder). [Technical means to solve the problem]

The first aspect of the present invention can provide a method of manufacturing a film for a packaging bag, the film for a packaging bag having an easy-opening process, the manufacturing method comprising: a stage of providing a printed layer by printing halftone dots on the first layer; The stage of forming a laminated film by laminating one or more second layers on the first layer; and irradiating light from the first layer side to the printed layer in the laminated film to form linear grooves in the laminated film stage.

The second aspect of the present invention can provide a method of manufacturing a packaging bag that forms a packaging bag by sealing the peripheral portions of two packaging bag films made of the packaging bag film of the first aspect. The packaging bag is made by the manufacturing method of film.

A third aspect of the present invention can provide a film for packaging bags, which is processed by easy opening and has a laminated film, and is formed in the laminated film from the first layer side and through the printing layer. There are linear grooves, and the laminated film has: a first layer; a printing layer formed by printing dots on the first layer; and a single layer or a plurality of layers laminated on the first layer through the printing layer Second floor.

A fourth aspect of the present invention may provide a packaging bag formed by sealing two sheets of the packaging bag according to the third aspect with a peripheral edge portion of a film.

Furthermore, the above summary of the invention does not list all the technical features of the present invention. In addition, a subset of these technical features can also become the present invention.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments are not intended to limit the inventions within the scope of the invention claims. In addition, the combination of all the technical features described in the embodiments is not necessary in the solution of the invention.

Fig. 1 shows the structure of the packaging bag 1 in this embodiment. The packaging bag 1 is a bag-shaped pouch container, which includes films 10, 20, 30 and a fastener 31. The pouch container is provided with linear grooves 15, 25 over the entire width of the upper end side for easy opening processing. And it can be opened by tearing easily from one side to the other side along the tear linear groove 15,25. Furthermore, in Fig. 1, etc., the left and right directions in the drawings are called left and right directions or horizontal directions, the up and down directions in the drawings are called up and down directions or vertical directions, and the front side of the drawings is also called only the front side, and the front side of the drawings is also called the front side. The rear side is simply called the rear side.

The films 10 and 20 are flexible laminated films constituting the front and back of the packaging bag 1, respectively. Films 10, 20, take the following configuration as an example: they have a rectangular shape but the four corners are processed into rounded corners, and a sealing area for bonding to each other or to the film 30 is provided at the peripheral portion, that is, at the left end The upper end is provided with sealing areas 18a, 28a for mutual bonding, the right end is provided with sealing areas 18b, 28b for mutual bonding, the upper end is provided with sealing areas 18c, 28c for mutual bonding, and the lower end is provided with The sealing areas 18d and 28d are used for bonding the film 30 to each other. Here, the left and right ends of the sealing regions 18d, 28d are wider in the longitudinal direction than the width at the center. In this embodiment, these boundaries may be provided in a parabolic shape, but not limited thereto, and may be arranged in a V-shape, for example.

In addition, the films 10, 20 include: printing regions 14, 24; linear grooves 15, 25; induction grooves 16a, 26a, 16b, 26b; and gaps 17a, 17b.

The printing regions 14 and 24 are rectangular regions provided continuously over the entire width of the upper end side of the films 10 and 20 . The printing areas 14 and 24 include a printing layer S14 formed using printing ink between any two of the plural layers constituting the films 10 and 20 . Furthermore, the printing area 14, 24 may be provided outside the peripheral portion to be heat-sealed, or may be intermittently provided without being provided in a partial area, instead of being provided over the entire width of the film 10, 20. The mode is set continuously. Details about the printed layer S14 will be described later.

The linear grooves 15, 25 are a kind of processing grooves, and are respectively formed in the printing areas 14, 24 over the entire width of the packaging bag 1, and the processing grooves are used to guide the film 10, 20 is torn and arranged on the surface of the film 10,20. Furthermore, as an example, the linear groove 15 is linear, and the linear groove 25 is partially curved. Alternatively, the linear grooves 15 and 25 may be curved in partially different directions, respectively. The linear grooves 15, 25 overlap at least in the sealing regions 18a, 18b, 28a, 28b which are peripheral portions of the films 10, 20. The details of the linear grooves 15 and 25 will be described later.

The induction grooves 16a, 26a, 16b, and 26b are processing grooves, and are bent in half so as to surround notches 17a, 17b described later at the left and right ends in the printing areas 14, 24 and intersect with the linear grooves 15, 25. Formed in an oval shape, the processed grooves are formed on the surfaces of the films 10, 20 to assist the tearing of the films 10, 20 when the packaging bag 1 is opened. When the tearing of the film 10, 20 starting from the notch 17a, 17b starts to deviate from the linear groove 15, 25, even if it deviates in any direction, it will still reach the induction groove 16a, 26a, 16b, 26b, so it can Induced by these induction grooves, it returns to the linear grooves 15 and 25 .

The notches 17a, 17b are notches for starting the tearing of the films 10, 20, and the left and right ends of the films 10, 20 are continuous along the linear grooves 15, 25 along the linear grooves 15, 25. 25 formed. Furthermore, the notches 17a, 17b can maintain the sealing of the packaging bag 1 by being formed at the sealing areas 18a, 28a and 18b, 28b which are bonded to each other.

The film 30 is a flexible laminated film constituting the bottom surface of the packaging bag 1 . The film 30 is an example of a configuration in which four corners are rounded in a rectangular shape, and is bent so as to protrude from a plane with respect to a reference line L30 passing through the center and extending in the lateral direction, and The front half is provided with a seal region 30c that seals with the seal region 18d of the film 10 , and the rear half is provided with a seal region 30d that seals with the seal region 28d of the film 20 . At the left and right ends of the sealing areas 30c, 30d, two sets of semicircular notches 30e are provided, which are used to adhere the inner surfaces of the films 10, 20 to each other.

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

The packaging bag 1 can be formed using the above-mentioned members. The male and female members of the fastener 31 are configured to be fixed to the inner surfaces of the films 10, 20, respectively. First, make the inner surfaces of the films 10, 20 face each other, and align the respective linear grooves 15, 25, then fold the film 30 in two on the reference line L30, make its folded edge upward, and The film 30 is inserted between the films 10 and 20 so that one of them faces the film 10 and the other faces the film 20 . Then, the peripheral edge portions of the films 10, 20, 30, that is, the sealing areas 18a, 28a and the sealing areas 18b, 28b of the films 10, 20, the sealing area 18d of the film 10, the sealing area 30c of the film 30, and the sealing area of the film 20 are The region 28d and the sealing region 30d of the film 30 are heat-sealed (heat-sealed), respectively. At this time, part of the sealing region 18 d of the film 10 and the sealing region 28 d of the film 20 are directly welded via the notch 30 e of the film 30 . Next, at the left and right ends of the sealed films 10, 20, linear grooves 15, 25 are overlapped, and notches 17a, 17b are provided, respectively. Finally, the contents are filled from the opening on the upper end side of the packaging bag 1, and then the sealing regions 18c, 28c of the films 10, 20 are heat-sealed. Thereby, the central region 30a of the film 30 folded in two is unfolded to form a concave bottom surface, and at the lower ends of the films 10, 20, the left and right ends are fixed via the notch 30e of the film 30 and unfolded in the center of the left and right. The foot is formed in a manner such that the packaging bag 1 can be constituted as a standing pouch capable of standing on its own.

The opening 1a of the packaging bag 1 is shown in FIG. 2 . When the packaging bag 1 is unsealed, the user will pinch the left end or the right end of the packaging bag 1 with fingers, and pull the upper side to the front side than the lower side of the notch 17a, 17b or press it to the lower side than the notch 17a. The notch 17a, 17b is deepened so that the lower side of 17b is more rearward, and the film 10, 20 is torn to the other side along the linear groove 15, 25 continuous therewith. Thereby, the packaging bag 1 is torn from the upper end to form the opening 1a, and the packaging bag 1 is opened. Here, the linear groove 15 of the film 10 is straight, but the central portion of the linear groove 25 of the film 20 is curved downward to a maximum width Δ. The opening ends of the films 10, 20 are shifted to the maximum width Δ at the center, so that the fingers can only pinch the film 20 to separate the film 20 from the film 10 and easily expand the opening 1a, so that the fastener can be easily opened 31.

Fig. 3 shows the easy-opening film S for packaging bags in this embodiment. As an example, the film S for packaging bags is a raw material film in which the respective lower ends of a pair of films 10 and 20 constituting a packaging bag 1 are connected and arranged in the left-right direction, and the respective lower ends of a plurality of pairs of films 10 and 20 are arranged in a horizontal direction. The left and right ends are connected to each other and integrally included in the longitudinal direction, and the film S for packaging bag is cut along the boundary line shown by the dotted line in the figure to form a plurality of pairs of films 10 , 20 . Furthermore, in the manufacturing process of the packaging bag 1, the film S for the packaging bag can be cut into the film S1 containing only the film 10 and the film S2 containing only the film 20 along its center line (dotted line), and for each Films S1 and S2 are cut along boundary lines (dotted lines) to obtain individual films 10 and 20 .

The film S for packaging bags includes: printed areas 14, 24 extending longitudinally along the left and right ends, respectively; formed; and, the induction grooves 16a, 26a, 16b, 26b are individually arranged near the boundaries (dotted lines) of the films 10, 20 in the printing areas 14, 24, respectively. These configurations are as described above, but do not include the case where a plurality of regions defining a plurality of thin films 10 and 20 are formed separately.

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

The PET layer S11 is an example of the first layer, and has high transparency and non-stretchability by forming, for example, a thickness of 12 μm using polyethylene terephthalate. The PET layer S11 is suitable as a base layer for printing. Furthermore, as the material of the outermost layer, that is, the first layer, as long as it has such characteristics, a polycondensate can be used, which is obtained by using an aromatic dicarboxylic acid or an aliphatic dicarboxylic acid and a diol as constituents. Polymerized monomers, such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc. Among these, PET and PBT are particularly preferable. In addition, the polyamide mentioned later can also be used.

The printing layer S14 is provided in the printing regions 14 and 24 on the back (lower surface) of the PET layer S11, and is an extremely thin layer sandwiched between the PET layer S11 and the NY layer S12 described later. The printing layer S14 can be provided, for example, by gravure printing halftone dots using white ink containing titanium oxide. Furthermore, colored inks containing organic manganese, carbon, and the like can also be used for printing.

The NY layer S12 is an example of the second layer laminated on the PET layer S11 which is the first layer via the printed layer S14, and is formed to have a thickness of 15 μm using, for example, nylon (NYLON). The NY layer S12 is suitable for strong resistance to impact and bending and can be used to secure strength that is difficult to open holes. Moreover, among the second layer, the material of the layer constituting the outer layer together with the above-mentioned first layer, as long as it has such characteristics, polyamide can be used, for example: NYLON 6, NYLON 66, NYLON 46, NYLON 69, NYLON 610, NYLON 612, NYLON 11, NYLON 12, NYLON MXD6, etc. From the viewpoint of ease of handling, NYLON 6 or NYLON 66 is preferable. Furthermore, the aforementioned polyesters can also be used.

Furthermore, when nylon and polyester are used as the material of the film constituting the outer layer in 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. For example, polyethylene is used to form a thickness of 100 to 150 μm, especially 130 μm in this embodiment, so that when forming a stand-up pouch, it will have high rigidity that can stand on its own, and will A sealant layer suitable for heat sealing (heat welding) by melting at 100 to 130° C. is formed. Moreover, the material of the innermost layer in the second layer can be used as long as it is a material suitable for heat sealing (heat welding), and it is possible to use one or a mixture of two or more of the following components: polyolefin, such as Low-density, medium-density or high-density polyethylene, linear low-density polyethylene, isotactic polypropylene, syndiotactic polypropylene; ethylene-propylene copolymers; poly-1-butene, poly-4-methyl-1-pentene; Ethylene-1-butene copolymer; Propylene-1-butene copolymer; Ethylene-propylene-1-butene copolymer; Ethylene-vinyl acetate copolymer, ionomer; Ethylene - Acrylate copolymers, etc.

As an example of another second layer, a metal layer (or metal foil) such as aluminum that does not penetrate gases such as oxygen or moisture and blocks light from the outside to prevent light from entering may be provided. Here, the PET layer S11, the NY layer S12, the metal layer, and the PE layer S13 can be laminated in this order. In addition, the NY layer S12, the metal layer, and the PE layer S13 may be sequentially laminated without including the PET layer S11. In addition, the PET layer S11, the metal layer, the NY layer S12, and the PE layer S13 may be laminated in sequence. In addition, the PET layer S11, the metal layer, and the PE layer S13 may be sequentially laminated without including the NY layer S12.

In addition, instead of the above-mentioned metal layer, an evaporation layer may be provided. The evaporation layer is formed by chemical vapor deposition (CVD), vacuum evaporation, sputtering, ion plating, etc., by depositing inorganic materials such as silicon oxide or aluminum oxide. Evaporation of ceramics, carbon, etc. In addition, the barrier resin coating agent can also be coated to form a coating layer. The barrier resin coating agent is composed of polycarboxylic acid polymer, vinylidene chloride or ethylene vinyl alcohol copolymer, etc. By.

In addition, as the laminated film of the non-heating pouch container, a laminated layer 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 is suitable as a strength assurance layer, and the PE layer is suitable as a heat-sealing layer. Here, a transparent barrier (evaporated) PET layer can be used instead of the PET layer. The transparent barrier PET layer is formed by providing a transparent barrier layer on the inner surface side of the PET layer, and is suitable as a printing layer. In addition, a laminate of an NY layer, an aluminum vapor-deposited PET layer, and a PE layer can also be used. In such cases, the print layer would be provided on the NY layer. The vapor-deposited side of the PET layer faces the NY layer side. In addition, a laminate of an NY layer and a PE layer can also be used. By disposing the printing layer on the NY layer, the PET layer can be omitted. In addition, a laminate of PET layer, NY layer, aluminum foil, and PE layer can also be used. Aluminum foil can be laminated between PET layer and NY layer. It is also possible to place the printing layer on the NY layer to make a laminate of the NY layer, aluminum foil and PET layer.

An example of the arrangement of halftone dots in the printing layer S14 is shown in FIG. 4B. Here, a screen point is a collection of plural points dt. In the present embodiment, as an example, the halftone dots are arranged in a square lattice shape inclined at 45 degrees by circular dots. Here, the setting is as follows: the point width is d, the separation distance between the most adjacent 2 points among the plural points dt is w, and the center-to-center distance between the most adjacent points is W(=w+d ), the width of the gap area formed between the most adjacent 4 points is D. As an example, the dot width is about 120 μm, the separation distance w is about 60 μm, the center-to-center distance is about 180 μm, and the width D of the gap region is about 120 μm. Furthermore, the size of the spot LS of the laser light can be set to 240 μm, for example.

Here, the separation distance w is smaller than the width H of the linear grooves 15, 25 and the size of the spot LS of laser light used when forming the linear grooves 15, 25 (in this embodiment, the width H of the linear grooves 15, 25 equal to the spot size of the laser beam). Thereby, when the printed layer S14 is scanned with laser light in any direction including the oblique direction but not limited to the horizontal direction, at least a part of at least one dot dt among the plurality of dots dt included in the halftone dots can be irradiated to form Linear grooves 15, 25. This makes it possible to adjust the amount of absorption of laser light, that is, the amount of heat released through the density of dots.

In addition, the center-to-center distance W may be set to be equal to or less than the width (the size of the spot LS of laser light) H of the linear grooves 15 and 25 . Thereby, when the printed layer S14 is scanned with laser light in any direction, at least one dot dt of the dots dt of the halftone dots is irradiated with respect to the direction perpendicular to the scanning direction to form linear grooves 15, 25. This makes it possible to adjust the amount of absorption of laser light, that is, the amount of heat released, through the separation distance of dots dt related to the scanning direction, that is, the density of halftone dots.

In addition, the scanning line of the laser light (that is, the linear groove) is not limited to a linear portion, and may include a curved portion in at least a part thereof. In such a case, the above conditions can be applied to any of the straight portion and the curved portion. In addition, the condition can also be applied to the direction perpendicular to the scanning direction of the laser light (or the width direction of the linear groove) as described below.

When the dots arranged in a 45-degree inclined square grid as shown in Figure 4 are scanned with laser light in the left-right direction of the drawing, the vertical direction of the drawing between two adjacent dots among the plurality of dots dt (That is, the separation distance w' related to the direction perpendicular to the scanning direction of the laser light or the width direction of the linear groove) can be set to be smaller than the size H of the spot LS of the laser light. Thereby, when the printed layer S14 is scanned with laser light, the linear grooves 15 and 25 can be formed by irradiating at least a part of at least one dot dt among the plurality of dots dt included in halftone dots. In addition, the separation distance W' between centers related to the vertical direction of the drawing (that is, the direction perpendicular to the scanning direction of the laser light or the width direction of the linear groove) between two adjacent points can be set as The size H of the spot LS of emitted light is equal to or smaller than that. Thereby, when the printed layer S14 is scanned with laser light, at least one dot dt of the halftone dots dt is irradiated to form the linear grooves 15 and 25 .

In addition, the scanning of the laser light is not limited to a straight line, and scanning may be performed in a curved manner. That is, the linear grooves 15 and 25 may be formed in a curved shape, and are not limited to a straight shape. Under such circumstances, the separation distance and the center-to-center distance between adjacent two points can be set in the direction perpendicular to the scanning direction of the laser light (or the distance between the linear grooves) at the position closest to the two points. Width direction) is determined in a related way.

Furthermore, the plurality of dots dt included in the halftone dots are not limited to circles, and may be in arbitrary shapes such as ellipses, triangles, squares, and rhombuses, and dots dt of plural 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 may be an irregular arrangement.

Fig. 5 A and Fig. 5 B show the cross-sectional structure of the linear groove 15, 25 in the transverse direction, and the linear groove is located in the dot part and the plurality of dots dt of the network dots in the printing layer S14. The part of the gap between the points dt. For the laminated film shown in FIG. 4A, by irradiating laser light on the printed layer S14 in the laminated film from the side of the PET layer S11, it is possible to form a layer facing the inside of the laminated film from the side of the PET layer S11 and via the printed layer S14. The linear groove 15,25. Here, as shown in FIG. 4B , a plurality of dots dt arranged at fixed intervals are scanned in the horizontal direction by moving the spot LS of laser light in the horizontal direction relative to the halftone dots.

As shown in FIG. 5A, at the dot part of the network dot, the dot dt that has absorbed the laser light will emit heat, and the PET layer S11 and the NY layer S12 sandwiching the printing layer S14 will be melted by this heat, thereby forming a reachable Linear grooves 15, 25 on the surface of the PE layer S13 or near the surface.

On the other hand, as shown in Fig. 5B, at the gaps of dots, the laser light will be absorbed in the laminated film (especially PET layer S11 and NY layer S12) and the heat release will be weak. Melting the PET layer S11 and the NY layer S12 keeps the state of the PET layer S11 and the NY layer S12 in close contact with each other to form the linear grooves 15 and 25 in the layer reaching the NY layer S12. Furthermore, depending on the intensity of the laser light and the amount of heat generated in the film, sometimes the state of the PET layer S11 and the NY layer S12 in close contact with each other is maintained to form the linear grooves 15 and 25 in the layer reaching the PET layer S11. .

FIG. 5C shows the longitudinal cross-sectional structure of the linear grooves 15, 25 (the cross-sectional structure of the reference line CC in FIG. 4B). Linear grooves 15, 25 form shallower grooves where the PET layer S11 and the NY layer S12 are closely bonded to each other at the interstices of the network dots along the direction of the grooves, and at the dots of the network dots will form the surface or the surface of the PE layer S13. A deeper cavity near the surface and having the same shape as the point dt. Thereby, the shallower groove bottom formed by the close contact of the PET layer S11 and the NY layer S12 at the linear grooves 15 and 25 will include relatively shallow grooves aligned in the groove direction and reaching the surface or near the surface of the PE layer S13. For multiple deep holes, the tearing of the films 10 and 20 will start at the deeper holes at the point. In the gap where the PET layer S11 and the NY layer S12 are closely bonded to each other, the tearing of the films 10 and 20 will begin. This continues, whereby the films 10 , 20 can be easily torn along the linear grooves 15 , 25 .

Figure 5 shows the cross-sectional structure of the linear grooves 15, 25 in the transverse direction. The linear grooves 15, 25 use printing ink to uniformly print the printing areas 14, 24 to set the printing layer S14, and to The printed layer S14 is formed when laser light is irradiated. If the uniformly printed printing layer S14 is irradiated with laser light, the light absorption will be strong and excessive heat will be released, and the heat will be diffused in a wide range. In particular, the molten materials of the PET layer S11 and the NY layer S12 will be online The periphery of the shaped grooves 15, 25 is raised high to form a wide-ranging shoulder S11a.

On the other hand, if the dots of the partially printed printing layer S14 are irradiated with laser light, heat will be released due to appropriate light absorption, thereby forming the linear grooves 15, 25, thereby becoming easy as described above. To tear the film 10, 20, the linear groove 15, 25 includes: the shallow groove bottom formed by the PET layer S11 and the NY layer S12 being closely bonded at the gap part of the dot, and the dot part of the dot. Part of the deeper cave. By doing so, the printing layer S14 is formed by halftone dots, and it is possible to have both the adhesion between the films which are important for the films 10 and 20 to be easily torn, and an appropriate amount of heat generation.

Fig. 5E shows the cross-sectional structure of the linear grooves 15, 25 in the sealing regions 18a, 18b, 28a, 28b which are peripheral portions. In the laminated film shown in FIG. 4A, by irradiating the printed layer S14 in the laminated film with laser light from the side of the PET layer S11, linear grooves 15, 25, which faces toward the inside of the laminated film from the side of the PET layer S11 through the printing layer S14. Further, when using the films 10, 20 to form the packaging bag 1, the films 10, 20 are overlapped and the sealing areas 18a, 18b, 28a, 28b are heat-sealed (thermally welded), whereby the material constituting the PE layer S13 in particular is melted and It is filled into the linear grooves 15 and 25 . Furthermore, when a layer that can be dissolved by heat sealing (thermal welding) is provided, the material constituting the layer may also be filled into the linear grooves 15, 25 together, and is not limited to the material constituting the PE layer S13. Thereby, by forming the linear grooves 15, 25 in the films 10, 20, the tearing of the packaging bag 1 becomes easy. On the other hand, there is also a possibility that the packaging bag 1 is torn inadvertently and thus abnormal opening may occur. , and by filling the linear grooves 15, 25 with the material of the PE layer S13 at the peripheral portion, the possibility of unintentional tearing of the packaging bag 1 becomes sufficiently small.

Furthermore, in order to prevent the above-mentioned unintentional tearing of the packaging bag 1, the following method can also be used instead of filling the linear grooves 15, 25 with film material: the peripheral edge portion of the packaging bag 1, that is, the film 10, 20 And especially in the sealed areas 18a, 18b, 28a, 28b, for example, the printed areas 14, 24 are not irradiated with laser light, and no easy-opening process is performed, that is, no linear grooves are formed. In such a case, for example, when the spot LS of laser light scans the peripheral portions of the films 10 and 20, an optical shutter is allocated on the optical path to block the laser light so that no lines are formed at the peripheral portions. shaped ditch. Alternatively, it can be set as follows: the printing layer S14 containing low-density dots is provided at the peripheral part or the printing layer S14 is not provided, that is, the region where the light absorption is weaker than the region between the peripheral parts is provided at the peripheral part, and then laser light is irradiated. To form shallow linear grooves, the low-density dots have fewer dots than the dots in the area between the peripheral parts or the dot area is small and the area ratio of the dot part to the gap part is small. Or, it may be set as follows: a printing layer including halftone dots is provided in the area between the peripheral parts and a uniformly printed area is included in the peripheral part as described later, that is, in the peripheral part, the area between the peripheral parts is provided with The areas where the film 10 and 20 have low adhesion are then irradiated with laser light to form linear grooves that are difficult to tear.

Fig. 6 shows the flow of the manufacturing step S100 of the film S for packaging bags provided with easy-opening processing in this embodiment.

In step S101, a printing layer S14 is provided on the first layer, that is, the PET layer S11. The printing layer S14 can be provided by the following method: use a gravure printing machine, for example, use white ink containing titanium oxide to print halftone dots. Furthermore, colored inks can also be used to print dots. The colored inks are: silver inks containing aluminum and aluminum alloys; black inks containing carbon black, graphite, etc.; pearl-based inks containing mica, Iriodin, etc.; iron oxide Such as brown ink, etc.

In step S102, a layered film is formed by laminating a second layer including one layer or a plurality of layers including the NY layer S12 on the PET layer S11 through the printing layer S14. In this embodiment, the NY layer S12 and the PE layer S13 are included as the second layer. Furthermore, an aluminum layer may also be included. Furthermore, the lamination can be performed by dry lamination, can be performed by extrusion coating lamination or can be performed by non-sol lamination (also called solvent-free lamination), which is the The adhesive is coated on the PET layer S11, and then the solvent is evaporated in the drying device and the second layer is thermally bonded. The extrusion coating lamination is to melt the material of the second layer and extrude it into a film, and then Laminated on the PET layer S11, the non-sol laminate is coated with a solvent-free adhesive such as a thermoplastic urethane adhesive on the PET layer S11, and then the second layer is adhered to the PET layer without a drying step. on layer S11.

In step S103, the laminated film formed in step S102 is cut to form a raw film having a predetermined width. Here, when a defective part is detected on the laminated film in the printing step of step S101 and the laminating step of step S102, a flag is inserted at the end of the film. Then use the flag as a mark, cut and remove the defective part, or connect the cut laminated film. Furthermore, in order to improve the smoothness of the film, dusting may be performed on the inner surface side.

In step S104, easy-open processing is performed on the raw material film formed in step S103, and the film S for packaging bags is manufactured. Here, the printed layer S14 in the laminated film is irradiated with laser light from the side of the PET layer S11 to form the linear grooves 15 and 25 over the entire width of the laminated film.

The schematic configuration of the laser processing machine 50 is shown in FIG. 7 . The laser processing machine 50 is a device for forming the linear grooves 15, 25 and the induction grooves 16a, 16b, 26a, 26b by irradiating the raw material film (laminated film) formed in step S103 with laser light, and includes: a light source 51. A reflective element 52, a light collecting 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 CO ₂ laser is used as an example in this embodiment. The output of the _CO2 laser is 20 to 30 W, preferably 24 to 30 W, more preferably 24 to 30 W when the laser light is irradiated to the dot-shaped printing layer S14 using a white ink containing titanium oxide. It is 27~28W. Furthermore, as long as the linear grooves 15, 25 can be formed on the laminated film, that is, as long as the printing layer S14 can be irradiated with light to cause heat release, any laser light source with any wavelength can be used, and a laser light source capable of emitting high intensity can also be used. Other sources of light beams are not limited to laser light.

The reflective element 52 is an optical element that reflects laser light and guides it to the raw material film, for example, a mirror element provided at the interface can be used.

The light-collecting optical system 53 is an optical system including lens elements, and the lens elements are used to collect laser light and form a light spot on the raw material film.

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

The laser light emitted from the light source 51 is directed to the raw material film through the reflective element 52 , and then a light spot is formed on the raw film by the light collection optical system 53 , and two-dimensionally scanned on the raw film by the scanning optical system 54 . Thereby, the linear groove 15, 25 etc. are formed in a raw material film, and the film S for packaging bags is obtained after that.

The winder R is a device that winds the obtained film S for packaging bags into a roll shape. A certain amount of roll-shaped film S for packaging bags is taken out from the winding machine R and conveyed out of the device.

FIG. 8 shows an example of processing linear grooves 15 and 25 by a laser processing machine 50 . Two laser processing machines 50 are used for the raw film shown in FIG. 3, and one of them (referred to as the left laser) forms linear grooves 15 and induction grooves 16a, 16b in the printing area 14 on the left end side of the raw film. , and the other (referred to as the right laser) forms linear grooves 25 and induction grooves 26a, 26b in the printing area 24 on the right end side of the raw material film. The material film is conveyed in the direction of the white arrow by a conveying device (not shown), and the scanning optical system 54 first scans with the left laser and the right laser along the respective semi-elliptical paths, and the Induction grooves 16a, 26a are formed at one side ends of 10, 20.

Then, scanning with the left laser along a partially curved path and simultaneously scanning with the right laser along a straight path results in the formation of linear grooves 15 , 25 over the entire width of the films 10 , 20 , respectively. Here, as mentioned above, the linear groove 25 is a straight line, and the linear groove 15 is partially curved. At this time, the linear grooves 15, 25 intersect with the previously formed induction grooves 16a, 26a.

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

For the raw material film, the induction grooves 16a, 26a, the linear grooves 15, 25 and the induction grooves 16b, 26b are repeatedly formed on the plurality of films 10, 20 continuous in the longitudinal direction, thereby forming a film S for packaging bags, It is formed with linear grooves 15, 25 and induction grooves 16a, 26a, 16b, 26b.

Furthermore, in step S104 , after the easy-opening process is applied to the raw material film to form the film S for packaging bags, the film S for packaging bags is wound up into a roll shape by the winding machine R. Here, the film S for packaging bags is wound up in the direction of the white-painted arrows in FIG. 8 , that is, parallel to the linear grooves 15 and 25 . In the printing areas 14 and 24, by irradiating the printing layer S14 formed by printing the dots shown in FIG. 4 B with laser light, as shown in FIG. 5 A and FIG. The surface of the film S is less likely to bulge around the linear grooves 15 and 25 (shoulders are less likely to occur), so that a roll of the film S for packaging bags can be obtained with less irregularities on the surface and less prone to wrinkles.

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

In step 200 , using the roll-shaped film S for packaging bag formed in step S104 , the peripheral portion is sealed to form a bag to form a packaging bag 1 . Step S200 may be carried out after the step S100 of manufacturing the film S for packaging bags, or may be carried out after a while.

FIG. 9 shows a schematic configuration of the bag making device 60 . The bag-making device 60 is a device for performing the bag-making step S200, and may be installed in combination with the device system including the laser processing machine 50 for performing the manufacturing step S100 of the film S for packaging bags, or may be installed independently. The bag making device 60 includes a cutter 62 , a fastener installer 61 , a heat sealer 63 , a notch 64 , and a cutter 65 .

The cutting machine 62 sends out the film S from the roll-shaped film S for packaging bags, and cuts the film S for packaging bags along the center line (the dotted line in the center in FIG. 3 ) to cut the film S1 containing only the film 10. and film S2 comprising only film 20 .

The fastener mounter 61 fixes the male member and the female member constituting the fastener 31 to the inner surfaces of the films 10, 20 contained in the films S1, S2, respectively. The films S1 and S2 are fed out in a state in which their respective inner surfaces are superimposed on each other. At this time, the linear grooves 15 , 25 of the films 10 , 20 overlap at least at the periphery.

The heat-sealer 63 inserts the film 30 folded in half between the stacked films S1 and S2, and heat-seals (heat-seals) the peripheral portions. Thereby, the sealing areas 18a, 28a, 18b, 28b of the respective films 10, 20 contained in the films S1, S2 are heat-sealed respectively, and the sealing area 18d of the film 10 and the sealing area 30c of the film 30, the film The sealing area 28d of the film 20 and the sealing area 30d of the film 30 are respectively heat-sealed. Thereby, the packaging bag 1 can be formed with an open upper end. At this time, at the sealing regions 18a, 28a, 18b, 28b, the linear grooves 15, 25 of the films 10, 20 are filled with the material of the PE layer constituting the second layer. Thereby, as mentioned above, tearing of the packaging bag 1 which occurs unintentionally can be suppressed.

The notch machine 64 provides notches 17a, 17b so as to overlap the linear grooves 15, 25 at the ends of the respective films 10, 20 included in the sealed films S1, S2. That is, notches 17a, 17b are formed in the films 10, 20 along the linear grooves 15, 25 in the peripheral portion.

The cutter 65 cuts the sealed films S1 and S2 to separate the continuous films 10 and 20 to form packaging bags 1 with openings at their upper ends.

Packaging bag 1 is conveyed out by self-made bag 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 areas 18c, 28c of the films 10, 20.

Fig. 10 and Fig. 11 A to Fig. 11 D show the state of the linear grooves formed in the film S for packaging bags. Here, comparing the linear groove 25 (left) and the linear groove 25 (right), the linear groove 25 (left) uses printing ink to set the printing layer S14 containing dots in the printing area 14, 24, and borrows It is formed by irradiating it with laser light, and this linear groove 25 (right) is uniformly printed to provide the printed layer S14 and formed by irradiating it with laser light. As the printing ink, white ink containing titanium oxide was used. The composition of dots is as shown in Figure 4B. The laser processing machine 50 uses the right laser (CO ₂ laser) among the two laser processing machines 50 . The correction of the output of the laser is shown in FIG. 13 . The conveying speed of the film S for packaging bags was set to 20 m/min, and the scanning speed of the laser light was set to 1600 mm/sec.

Fig. 10 shows the measurement results of the depth distribution of the linear grooves of the film S for packaging bags formed at 65% of the laser output. It can be seen that in the case of uniform printing (right), due to the strong light absorption of the printing layer, the heat will be released too strongly and the heat will be diffused in a wide range, so that the linear groove can be formed deeper, but the melted PET The material of the NY layer and the NY layer will bulge higher around the perimeter of the linear groove, creating a large shoulder. On the other hand, in the case of halftone dots (left), the dot part of the halftone dot of the printing layer receives light absorption, which strongly releases heat and diffuses the heat, thereby forming a deeper cavity. Absorption of light emits heat weakly, and the heat diffuses only in a narrow range to form a shallow bottom. Here, the melted materials of the PET layer and the NY layer slightly bulge the periphery of the linear groove to form a narrow shoulder. Compared with the case of uniform printing, it can be seen that the shoulders are low.

Figure 11A shows a magnified image of the linear groove formed by 80% of the laser output. It can be seen that in the case of uniform printing (right), due to the strong light absorption of the printing layer, the heat will be released too strongly and the heat will be diffused in a wide range, so that the linear groove can be formed deeper, although the bottom will reach To the PE layer (black part in the center), but the melted PET layer and NY layer material will swell higher around the linear groove, and a wide range of shoulders (upper and lower white parts) will be produced. Furthermore, since the shoulder portion is relatively wide, the width of the groove portion becomes narrow. On the other hand, in the case of halftone dots (left), the dot part of the halftone dot of the printed layer is strongly released by light absorption and the heat is diffused, thereby forming a deep hole reaching the PE layer, and by When light is absorbed by the interstices of the dots, heat is released weakly, and the heat diffuses only in a narrow range, and the state of the PET layer and the NY layer can be kept in close contact with each other to form a shallow bottom. Here, the melted materials of the PET layer and the NY layer slightly bulge the peripheral edge of the linear groove to form narrow shoulders (upper and lower white portions). Compared with the case of uniform printing (right), it can be seen that the width of the shoulder portion is narrow, while the width of the groove portion is wide.

Figure 11B shows a magnified image of the linear groove formed by 70% of the laser output. In the case of uniform printing (right), compared with the case of 80% output, it can be seen that as the light absorption by the printing layer becomes weaker, the heat generated cannot be diffused in a wide range, so a shoulder on the periphery of the linear groove is generated. The part is lower and the width becomes narrower, but the linear groove is also formed shallower. On the other hand, in the case of halftone dots (left), compared with the case of 80% output, since the light absorption by the printed layer becomes weaker, the linear grooves are formed shallower (less black parts) and narrower . However, as in the case of 80% output, when the dot part of the halftone dot of the printed layer receives light absorption, it will strongly emit heat and diffuse the heat, thereby forming a deep hole reaching the PE layer, and by the halftone dot The light absorption in the gap portion weakly radiates heat, and the heat diffuses only in a narrow range, so that the PET layer and the NY layer can maintain the state of mutual adhesion and form a shallow bottom.

Figure 11C shows a magnified image of the linear groove formed by 65% of the laser output. In the case of uniform printing (right), compared with the case of 70% output, linear grooves are formed shallower and narrower as light absorption by the printed layer becomes weaker. On the other hand, in the case of halftone dots (left), compared with the case of 70% output, as the light absorption by the printed layer becomes weaker, the linear grooves are formed shallower (few black parts) and narrower. However, as in the case of 70% output, deep pockets can be formed at the dots of the halftone dots of the printed layer, and the PET layer and the NY layer can be kept in a state where the PET layer and the NY layer are closely bonded to form a shallow bottom at the dot gaps of the halftone dots. .

Fig. 11D shows a magnified image of linear grooves formed by irradiating laser light on a printed layer containing halftone dots at an output of 55%. Compared with the case of 65% output, as the light absorption by the printed layer becomes weaker, the linear groove is formed shallower (less black portion) and narrower. However, it can be seen that the aforementioned linear groove structure is still maintained.

Fig. 12 shows the test results of the ease of opening of the packaging bag. As mentioned above, in the case where the printing layer S14 including halftone dots is provided using printing ink in the printing area 14, 24, and in the case where the printing layer S14 is provided by uniform printing, linear grooves are formed by irradiating the printing layer S14 with laser light. The packaging bags of 15 and 25 use the film S to form the packaging bag 1, pinch the end of the packaging bag 1 with fingers, and tear the film 10, 20 from the gap 17a or 17b to the other side along the linear groove 15, 25. One side to unseal the bag 1. Here, when the packaging bag 1 is unsealed, each of the following 4 methods is tested 10 times. The method is: pinch the left end or the right end of the packaging bag 1 with fingers, and pull the upper side to the notch 17a. Or the lower side of the notch 17b is more front side or pressed to more rear side. The case where the film 10, 20 can be torn to the other end to open the packaging bag 1 is regarded as a success, and the case where the film 10, 20 cannot be torn to the other end and stops during the opening of the packaging bag 1 is regarded as a failure, Then calculate the unsealing success rate for the laser output for the case of dots and uniform printing.

In the case of uniform printing, when the laser output is 80-90%, the linear grooves 15, 25 can be formed deep and the films 10, 20 can be easily torn, and the success rate of unsealing is as high as about 90%. However, if the laser output becomes as low as 65 to 75%, heat will be strongly released but will be dispersed widely, and linear grooves will be formed shallow and wide, and furthermore, between the PET layer S11 and the NY layer S12 A uniform printing layer S14 will weaken the adhesion between these layers, so the tearing of the films 10 and 20 will become difficult, and the success rate of unsealing will also drop to about 60%.

On the other hand, in the case of halftone dots, when the laser output is 55 to 90%, the dot part of the halftone dots on the printed layer receives light absorption and strongly emits heat to diffuse the heat, thereby forming a deep spot that reaches the PE layer. The hole part, and through the light absorption of the gap part of the network point, the heat will be released weakly, and the heat will only diffuse in a narrow range, and the state of the PET layer and the NY layer can be maintained to form a shallow bottom. The tearing of the films 10 and 20 will start at the deeper pockets of the dots, and the tearing of the films 10 and 20 will continue in the gaps where the PET layer S11 and the NY layer S12 are closely bonded to each other, and by The tearing is repeated from one end of the linear groove to the other end, the films 10 and 20 are easily torn, and the success rate of unsealing is as high as 80%.

Fig. 13 shows the measurement results (correction) of the laser output used when forming the linear grooves 15 and 25 of the film S for packaging bags. In the case of outlets, a laser output of 55-90% with a success rate of more than 80% in unsealing has been achieved, which is at least equivalent to 20-30W. In the case of outlets, a laser output of 65-90% with a success rate of more than 100% in unsealing has been achieved, which is equivalent to at least 24-30W. It is preferable to use the laser processing machine stably with a laser output of 75-85%, which is equivalent to at least 27-28W.

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

The packaging bags in the examples (Examples 1-5) are manufactured in accordance with the manufacturing method of the packaging bag 1 in the above-mentioned embodiment and are manufactured in the following steps in sequence: printing S101, lamination S102, slit S103, easy-opening processing S104 and Bag making S200. In the printing S101, halftone dots are gravure-printed on the inner surface side of the PET layer S11 (that is, the NY layer S12 side) using a white ink containing titanium oxide, whereby the printing layer S12 is provided. In the laminated layer S102, a laminated film was formed using a PET layer S11 with a thickness of 12 μm, an NY layer S12 with a thickness of 15 μm, and a PE layer S13 with a thickness of 130 μm. In the easy-opening process S104, the printed layer is irradiated with 25W CO ₂ laser light to form linear grooves in the laminated film. In bag making S200, the laminated film is heat-sealed at the peripheral portion to form a packaging bag. At this time, the linear grooves 15 and 25 in the peripheral portion can be filled with the material of the NY layer S12 and the PE layer S13, especially the material of the PE layer S13 constituting the sealant layer (see FIG. 5E).

The packaging bags in Comparative Examples (Comparative Examples 1-5) were manufactured in the following steps in sequence: printing S101, lamination S102, slit S103, bag making S200, and easy-opening processing S104. In the printing S101, halftone dots are gravure-printed on the inner surface side of the PET layer S11 (that is, the NY layer S12 side) using a white ink containing titanium oxide, whereby the printing layer S12 is provided. In the laminated layer S102, a laminated film was formed using a PET layer S11 with a thickness of 12 μm, an 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 peripheral portion to form a packaging bag. In the easy-opening process S104, the printed layer is irradiated with 25W CO ₂ laser light to form linear grooves in the laminated films on both sides of the packaging bag 1 . The packaging bag in the example is different from the packaging bag in the example by performing the easy-opening process S104 after the bag making S200, and the linear grooves 15 and 25 in the peripheral portion of the package in the comparative example are not filled with any material.

The initial stage opening strength measurement was implemented about the packaging bag in an Example (Examples 1-5) and the packaging bag in a comparative example (Comparative Examples 1-5), respectively. In the determination of the initial opening strength, the upper part of the packaging bag is clamped with a push-pull gauge (DS2-200N, manufactured by IMADA Co., Ltd.), and the lower part of the packaging bag is fixed, and then the gripper is moved from left to right at a speed of 3000mm/min. Right, whereby the bag is torn and the load applied to the clamps is measured using a push-pull gauge, the tear is terminated after the tear has passed the peripheral portion (sealing area 18a, 28a), and the tear is read from the push-pull gauge at the time of tearing The maximum load applied to the fixture. The maximum load of the packaging bags in Examples 1-5 was 12.18N on average, and the maximum load of the packaging bags in Comparative Examples 1-5 was 10.98N on average. In the packaging bag in the embodiment, the linear grooves 15 and 25 in the peripheral portion are filled with the material of the PE layer S13 constituting the sealant layer, so the initial unsealing strength is improved, thereby becoming able to suppress abnormal tearing. start. In addition, when the notches 17a, 17b are provided along the linear grooves 15, 25 filled with the PE layer S13, it is also possible to prevent delamination of the laminated film.

The manufacturing method of the film S for packaging bags in this embodiment includes: a step of printing halftone dots on the PET layer S11 to provide the printing layer S14; and forming by laminating the NY layer S12 and the PE layer S13 on the PET layer S11 through the printing layer S14. The stage of the laminated film; and the stage of forming the linear grooves 15 and 25 in the laminated film by irradiating light from the side of the PET layer S11 to the printing layer S14 in the laminated film. According to such a manufacturing method, by irradiating laser light to the printing layer S14 laminated in the laminated film, among the plurality of dots constituting the halftone dots of the printing layer S14, the dots that absorb the laser light emit heat, and the heat is The layers sandwiching the printed layer S14 are melted to form the linear grooves 15 and 25 in the laminated film. Here, since the printing layer S14 contains the printing ink distributed in the dot shape, the adhesion between the two layers sandwiching the printing layer S14 can be obtained, and by irradiating the printing ink in the dot shape with laser light, It is possible to efficiently dissipate heat with low light intensity and suppress the generation of fume, so that the easily torn linear grooves 15 and 25 can be formed in the film S for packaging bags.

Here, if light is irradiated to the non-printed area, the light absorption is weak and the heat dissipation is weak, so the linear groove will be formed shallowly, and the films 10 and 20 will become difficult to tear. If the printed layer S14 is uniformly printed The adhesion between the PET layer S11 and the NY layer S12 sandwiching the printed layer S14 will be weak and tearing will become difficult. If the printed layer S14 is irradiated with laser light, the light absorption will be strong and heat will be excessively released. Heat spreads over a wide range, so a large and large shoulder occurs around the periphery of the linear groove. On the other hand, if a partially printed halftone dot is irradiated with laser light, it receives appropriate light absorption and releases heat. Thereby, the PET layer S11 and the NY layer S12 are closely bonded to each other at shallow gaps in the dots, and partially deep linear grooves are formed at the dots, thereby facilitating tearing. Therefore, the manufacturing method of the film S for packaging bags in this embodiment is efficient even when using low-intensity laser light, and can suppress the generation of smoke to a small amount, and it becomes possible to easily open the film S for packaging bags. processing.

In addition, the manufacturing method of the packaging bag 1 in this embodiment forms the packaging bag 1 by sealing the peripheries of the two films 10 and 20 produced by the above-mentioned manufacturing method of the film S for packaging bags. Here, since the printing layer S14 provided in the printing area 14, 24 is formed in halftone dots, the other film on the back side of the film 10, 20 is visually viewed through the printing area 14 or 24 of one of the films 10, 20. , it is still possible to confirm the deviation of the films 10, 20 inside and outside.

In addition, the packaging bag film S in this embodiment has a laminated film, and the linear grooves 15, 25 are formed in the laminated film from the side of the PET layer S11 through the printing layer S14. The laminated film has a PET layer. S11, the printing layer S14 which printed halftone dots on the PET layer S11, and the NY layer S12 and the PE layer S13 laminated|stacked on the PET layer S11 via the printing layer S14. Here, the linear grooves 15 and 25 include a plurality of holes at the shallow bottom of the groove formed by the PET layer S11 and the NY layer S12 being closely bonded to each other. The holes are arranged in the direction of the groove and reach the surface of the PE layer. . In this way, the tearing of the films 10 and 20 will start at the holes in the dots, and the tearing of the films 10 and 20 will continue in the gap where the PET layer S11 and the NY layer S12 are in close contact with each other. 10 , 20 can be easily torn along the linear groove 15 , 25 . Here, even if the linear grooves 15, 25 are long, the linear grooves 15 of the film 10 and the linear grooves 25 of the film 20 are partially offset, and the inner surface layer of the films 10, 20, that is, the PE layer S13 is relatively thick, and the film 10 , 20 would still become capable of tearing easily along the linear groove 15 , 25 .

In addition, the packaging bag 1 in this embodiment is formed by sealing the peripheral edge part of the said film S for packaging bags.

Furthermore, the packaging bag film S in the present embodiment is formed by arranging a pair of films 10 and 20 constituting a packaging bag 1 on the left and right and connecting the respective side ends of a plurality of pairs of films 10 and 20 to each other. Continuously included form, but not limited thereto, can be made into a form in which only one of a pair of films 10, 20 is included in a plurality and continuously, or can be made into a plurality of pairs of films 10, 20 arranged side by side and arranged in a plurality of pairs The respective side ends of the thin films 10 and 20 are connected to each other and continuously included.

Furthermore, in the packaging bag 1 in this embodiment, the linear grooves 15, 25 are provided so as to extend over the entire width of the films 10, 20 in the left-right direction, but the linear grooves may be inclined from the upper end toward the side end. The way is set near the left or right shoulder. In addition, the linear grooves 15 and 25 are not limited to linear shapes, and may be provided in curved linear shapes.

Furthermore, in the packaging bag 1 in this embodiment, the cutouts 17a, 17b are provided at both ends in the left-right direction of the films 10, 20, but they may be provided only at one end.

Furthermore, in the manufacturing method of the film S for packaging bags in this embodiment, before the bag-making step S200 which is the last step of the manufacturing step S100, a step of irradiating the film S for packaging bags with laser light for easy-opening processing is set, but The following method can also be used to replace this step: In the bag making step S200, for example, after the films 10, 20, 30 are heat-sealed by the heat sealer 63 to form the packaging bag 1 with the upper end open, then During the process of cutting into individual packaging bags 1 by the cutter 65 , the packaging bags 1 are irradiated with laser light to perform easy-opening processing. In such a case, in order to prevent abnormal opening, easy-opening processing may be performed at places other than the sealing regions 18a, 18b, 28a, and 28b of the packaging bag 1 .

As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range described in the said embodiment. Those skilled in the art to which this invention pertains can understand that various changes and improvements can be added to the above-mentioned embodiment. It is clear from the description of the scope of claims that such changes and improvements are also included in the technical scope of the present invention.

The execution order of each processing such as actions, procedures, steps, and stages in the devices, systems, programs, and methods shown in the scope of the patent application, the specification, and the drawings, unless "before" or "before" is specifically stated etc., or without restricting the output of preprocessing for use in subsequent processing, care should be taken that this can be done in any order. Regarding the operation flow in the scope of the invention application, the specification and drawings, even if "first" and "then" are used for description for the sake of convenience, it does not mean that the operation flow needs to be implemented in this order.

According to this specification, the structure described by each item below is also disclosed. [Item 1] A method of manufacturing a film for packaging bags, the film for packaging bags is processed by applying an easy-open seal, the manufacturing method includes: a step of printing dots on the first layer to provide a printing layer; A step of laminating one or more second layers on the first layer to form a laminated film; and irradiating light from the first layer side to the printed layer in the laminated film to form linear grooves in the laminated film The aforementioned stage of laminated film. [Item 2] The method of manufacturing a film for packaging bags according to Item 1, wherein the dots are a collection of plural dots, and in the direction perpendicular to the scanning direction of the light, the corresponding dots among the plural dots are The separation distance between two adjacent points is smaller than the spot size of the aforementioned light. [Item 3] The method of manufacturing a film for packaging bags according to Item 2, wherein, in a direction perpendicular to the scanning direction of the light, the distance between the centers of two adjacent points among the plurality of points is: The spot size of the aforementioned light is below. [Item 4] The method for producing a film for packaging bags according to Item 1, wherein the linear grooves are deeper at dot positions of the dots than in regions between dots. [Item 5] The method for producing a film for packaging bags according to Item 1, wherein, in the step of providing the printing layer, printing is performed using a printing ink containing titanium oxide, and in the step of forming the linear groove, printing is performed using 20~30W _CO2 laser light. [Item 6] The method for producing a film for packaging bags according to Item 1, further comprising a step of rolling the laminated film after the step of forming the linear groove. [Item 7] A method of manufacturing a packaging bag, which forms a packaging bag by sealing a film for a packaging bag at a peripheral portion, the film for a packaging bag being the packaging bag described in any one of items 1 to 6 produced by film manufacturing methods. [Item 8] The method for manufacturing a packaging bag according to Item 7, wherein the linear groove of the film for packaging bag on one side of the packaging bag is linear, and the film for packaging bag on the other side is linear. The other linear groove is partially curved. [Item 9] The method for manufacturing a packaging bag according to Item 7, wherein at least one of the linear groove and the other linear groove of the film for packaging bag is subjected to the layer or layers of coating at the peripheral edge portion. The material of either layer in the second layer is filled. [Item 10] A film for a packaging bag, which is processed by easy opening and has a laminated film, the laminated film has a first layer, a printing layer provided with dots printed on the first layer, and a partition The aforementioned printing layer is laminated on the aforementioned first layer as one layer or a plurality of second layers, and the packaging bag film is formed in the aforementioned laminated film from the side of the aforementioned first layer with the aforementioned printing layer interposed therebetween. There are linear grooves. [Item 11] The film for packaging bags according to Item 10, wherein the dots are a collection of a plurality of dots, and in the width direction of the linear groove, the separation between two adjacent dots among the plurality of dots is The distance is smaller than the width of the aforementioned linear groove. [Item 12] The film for packaging bags according to Item 11, wherein, in the width direction of the linear groove, the distance between the centers of two adjacent points among the plurality of points is equal to the width of the linear groove the following. [Item 13] The film for a packaging bag according to Item 10, wherein the linear groove includes a plurality of deep portions. [Item 14] A packaging bag formed using the film for packaging bags described in any one of Items 10 to 13. [Item 15] The packaging bag according to Item 14, wherein the linear groove formed on one side of the packaging bag is linear, and the linear groove formed on the other side 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 first layer or the plurality of second layers at the periphery. [Item 17] A method of manufacturing a packaging bag, the packaging bag is processed by an easy-to-open seal, and the manufacturing method includes: a step of laminating one or a plurality of second layers on the first layer to form a laminated film; The linear groove is formed on the first layer side of the laminated film; and, the laminated film is sealed at the peripheral portion to form a packaging bag, and any one of the second layer of the layer or the plurality of layers The material is used to fill the linear grooves of the laminated film in the peripheral portion. [Item 18] The method for manufacturing a packaging bag according to Item 17, further comprising a step of forming a notch in the packaging bag along the linear groove in the peripheral portion. [Item 19] The method for manufacturing a packaging bag according to Item 17, further comprising a step of providing a printing layer by printing halftone dots on the first layer before the step of forming the laminated film. [Item 20] The method for manufacturing a packaging bag according to Item 19, wherein, in the step of providing the printing layer, printing is performed using a printing ink containing titanium oxide, and in the step of forming the linear groove, using 20 to 30 W of _CO2 laser light is irradiated from the first layer side to the printed layer in the laminated film to form the linear groove. [Item 21] The method for manufacturing a packaging bag according to Item 17, wherein the linear groove of the laminated film on one side of the packaging bag is linear, and the other linear groove of the laminated film on the other side is linear. The groove is partially curved. [Item 22] The method for manufacturing a packaging bag according to Item 17, wherein the linear groove of the laminated film on one side of the packaging bag is at least within a distance from the other linear groove of the laminated film on the other side. The aforementioned peripheral portions overlap. [Item 23] The method for manufacturing a packaging bag according to Item 17, wherein the linear groove is filled with the material of the sealant layer in the first layer or the second layer of the plurality of layers. [Item 24] A packaging bag, which is processed by easy opening and has a laminated film on at least one side, the laminated film has a first layer and a first layer or a plurality of layers laminated on the first layer. Two layers, and a linear groove is formed on the side of the first layer, and in this packaging bag, the linear groove of the aforementioned laminated film is protected by any one of the aforementioned layer or multiple layers of the second layer in the sealed peripheral portion. material filled. [Item 25] The packaging bag according to Item 24, wherein a notch formed along the linear groove is included in the peripheral portion. [Item 26] The packaging bag according to Item 24, wherein the laminated film further has a printing layer formed by printing halftone dots on the first layer. [Item 27] The packaging bag according to Item 24, wherein the linear groove of the laminated film on one side of the packaging bag is linear, and the other linear groove of the laminated film on the other side is partially bending. [Item 28] The packaging bag according to Item 24, wherein the linear groove of the laminated film on one side of the packaging bag and the other linear groove of the laminated film on the other side are at least in the peripheral portion overlapping. [Item 29] The packaging bag according to Item 24, wherein the linear groove is filled with the material of the sealant layer in the second layer of one or more layers. [Item 30] A method of manufacturing a film for a packaging bag. The film for a packaging bag is processed by applying an easy-to-open seal. The manufacturing method includes: a stage of providing a printing layer on the first layer; The second layer of the plurality of layers is laminated on the first layer to form a laminated film, and in this step, the laminated film includes a region in the peripheral part that absorbs light less than the region between the peripheral parts, or contains the first layer in the peripheral part. layer and the aforementioned layer or the second layer of the plurality of layers has a lower degree of adhesion than the area between the peripheral parts; The grooves are formed at the stage of the aforementioned laminated thin film. [Item 31] The method for producing a film for packaging bags according to Item 30, wherein in the step of providing the printing layer, the printing layer is provided by printing halftone dots on the first layer, and the printing layer includes Low-density dots compared to the inter-peripheral region. [Item 32] The method for manufacturing a film for packaging bags according to Item 30, wherein in the step of providing the printing layer, halftone dots are printed on the region between the peripheral portions of the first layer, and the dots are uniformly printed on the peripheral portion. Printing to set the aforementioned printing layer. [Item 33] The method for producing a film for packaging bags according to Item 30, wherein, in the step of providing the printing layer, printing is performed using a printing ink containing titanium oxide, and in the step of forming the linear groove, Use 20~30W _CO2 laser light. [Item 34] The method for producing 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 groove. [Item 35] A method for manufacturing a packaging bag, further comprising a step of sealing a packaging bag film at a peripheral portion to form a packaging bag, the packaging bag film being described in any one of Items 30 to 34 The packaging bag is made by the manufacturing method of film. [Item 36] The method of manufacturing a packaging bag according to Item 35, further comprising a step of forming a notch along the linear groove in the peripheral portion. [Item 37] The method for manufacturing a packaging bag according to Item 35, wherein the linear groove of the film for packaging bag on one side of the packaging bag is linear, and the film for packaging bag on the other side is linear. The other linear groove is partially curved. [Item 38] The method for manufacturing a packaging bag according to Item 35, wherein the linear groove of the packaging bag film on one side of the packaging bag is connected to the other line of the packaging bag film on the other side. The shaped grooves overlap at least at the peripheral portion. [Item 39] A film for packaging bags, which is processed by easy opening and has a laminated film, the laminated film has a first layer, a printing layer provided on the first layer, and a printing layer via the printing layer. One layer or a plurality of second layers laminated on the first layer layer by layer, and the peripheral portion includes a region whose light absorption is weaker than the region between the peripheral portions, or the peripheral portion includes the aforementioned first layer and the aforementioned layer or plural layers. The second layer of the layer is a region where the degree of adhesion between the second layers is lower than the region between the peripheral parts, and the film for packaging bags is formed in the aforementioned laminated film from the side of the aforementioned first layer and through the aforementioned printed layer. ditch. [Item 40] The film for packaging bags according to Item 39, wherein the printing layer is provided by printing halftone dots on the first layer, and the peripheral portion includes halftone dots having a low density relative to the region between the peripheral portions . [Item 41] The film for packaging bags according to Item 39, wherein the printing layer is provided by printing dots on the region between the peripheral parts on the first layer and uniformly covering the peripheral parts print. [Item 42] A packaging bag formed using the film for packaging bags described in any one of Items 39 to 41. [Item 43] The packaging bag according to Item 42, wherein a notch formed along the linear groove is included in the peripheral portion. [Item 44] The packaging bag according to Item 42, wherein the linear groove of the film for packaging bag on one side of the packaging bag is linear, and the other line of the film for packaging bag on the other side is straight. The groove is partially curved. [Item 45] The packaging bag according to Item 42, wherein the linear groove of the laminated film on one side of the packaging bag and the other linear groove of the laminated film on the other side are at least in the peripheral portion. overlapping.

1: Packing bag 1a: opening 10,20,30: Film 11,12,13: Film 21,22,23: Film 14,24: printing area 15,25: linear groove 16a, 16b, 26a, 26b: induced groove 17a,17b: Gap 18a, 18b, 18c, 18d, 28a, 28b, 28c, 28d: sealing area 30a: Central area 30c, 30d: sealing area 30e: missing corner 31: Fasteners 50:Laser processing machine 51: light source 52: reflective element 53: Collecting optical system 54: Scanning optical system 60: Bag making device 61:Fastener Installer 62: Cutting machine 63:Heat sealing machine 64: Notch machine 65: Cutting machine L30: baseline LS, LS1: Spot R: winder S: film for packaging bags S1, S2: film S100: Manufacturing steps of film for packaging bags S11: PET layer S11a: Shoulder S12:NY layer S13: PE layer S14: Printing layer S200: Bag making step Δ: Maximum width AA: baseline BB: baseline CC: baseline dt: point d: dot width D: The width of the gap area formed between the most adjacent 4 points H: the size of the spot W: the center-to-center distance between the most adjacent points W': Separation distance W between centers related to the vertical direction of the diagram between two adjacent points w: the separation distance between the most adjacent 2 points among the plural points dt w': Separation distance related to the vertical direction of the diagram between two adjacent points among the plurality of points dt

Fig. 1 shows the structure of the packaging bag in this embodiment. Fig. 2 shows the opening of the package. Fig. 3 shows the structure of the packaging bag film (raw film) in this embodiment. Fig. 4A shows a cross-sectional structure of a film for packaging bags (before easy-opening processing). FIG. 4B shows an example of the arrangement of halftone dots in the printed layer. Fig. 5A shows the cross-sectional structure of the linear groove in the dot portion of the halftone dot in the transverse direction. Fig. 5B shows the cross-sectional structure of the linear grooves in the interstices of dots in the transverse direction. Fig. 5C shows the cross-sectional structure of the linear groove in the longitudinal direction. Fig. 5D shows a cross-sectional structure of a linear groove formed as a uniformly printed portion. Fig. 5E shows a cross-sectional structure of linear grooves in the peripheral portion. Figure 6 shows the manufacturing process of the film for packaging bags. Figure 7 shows the schematic configuration of the laser processing machine. Fig. 8 shows an example of linear groove processing by a laser processing machine. Fig. 9 shows a schematic configuration of a bag making device. Fig. 10 shows the measurement results of the depth distribution of the linear grooves of the film for packaging bags formed with 65% of the laser output. Figure 11A shows the state of the linear grooves of the film for packaging bags formed by 80% of the laser output. Fig. 11 B shows the state of the linear groove of the film for packaging bags formed by 70% of the laser output. Fig. 11 C shows the state of the linear groove of the film for packaging bags formed by laser output 65%. Fig. 11 D shows the state of the linear groove of the film for packaging bags formed by laser output 55%. Fig. 12 shows the test results of the ease of opening of the packaging bag. Fig. 13 shows the measurement results of the laser output used when forming the linear grooves of the film for packaging bags. Fig. 14 shows the results of the initial opening strength measurement of the packaging bag.

Domestic deposit information (please note in order of depositor, date, and number) none Overseas storage information (please note in order of storage country, institution, date, and number) none

1: Packing bag

10,20,30: Film

14,24: printing area

15,25: linear groove

16a, 16b, 26a, 26b: induced groove

17a,17b: Gap

18a, 18b, 18c, 18d, 28a, 28b, 28c, 28d: sealing area

30a: Central area

30c, 30d: sealing area

30e: missing corner

31: Fasteners

L30: baseline

S11: PET layer

S12:NY layer

S13: PE layer

Claims (18)

A method for manufacturing a film for a packaging bag. The film for a packaging bag is processed by applying an easy-to-open seal. The manufacturing method has: The stage of setting the printing layer by printing dots on the first layer; A step of forming a laminated film by laminating one or more second layers on the first layer via the printed layer; and, The step where the printed layer in the laminated film is irradiated with light from the first layer side to form linear grooves in the laminated film. The method of manufacturing a film for packaging bags as claimed in item 1, wherein the above-mentioned dots are a collection of plural dots, and in the direction perpendicular to the scanning direction of the foregoing light, the adjacent 2 of the above-mentioned plural dots are The separation distance of the spots is smaller than the aforementioned spot size of the light. The method of manufacturing a film for packaging bags according to Claim 2, wherein, in a direction perpendicular to the scanning direction of the light, the distance between the centers of two adjacent points among the plurality of points is equal to the distance between the centers of the light Spot size below. The method of manufacturing a film for packaging bags according to any one of claims 1 to 3, wherein the position of the dots of the dots of the aforementioned linear grooves is deeper than the region between the dots. The method for producing a film for packaging bags according to claim 1, wherein printing is performed using a printing ink containing titanium oxide in the step of providing the printing layer, and 20 to 30 W is used in the step of forming the linear groove. CO ₂ laser light. The method of manufacturing a film for packaging bags according to claim 1, further comprising a step of rolling the laminated film after the step of forming the linear groove. A method of manufacturing a packaging bag, comprising sealing a film for a packaging bag at a peripheral portion to form a packaging bag, and the film for a packaging bag is produced by manufacturing the film for a packaging bag according to any one of Claims 1 to 6 method made. The method of manufacturing a packaging bag according to claim 7, wherein the linear groove of the film for packaging bag on one side of the packaging bag is linear, and the other line of the film for packaging bag on the other side is straight. The groove is partially curved. The method of manufacturing a packaging bag according to claim 7, wherein at least one of the linear groove and the other linear groove of the packaging bag film is subjected to the second layer of one or more layers at the peripheral edge Filled with material from any of the layers. A film for packaging bags, which is processed by easy-opening and has a laminated film, The laminated film has a first layer, a printing layer formed by printing halftone dots on the first layer, and a second layer of one or more layers laminated on the first layer via the printing layer, and, In this film for packaging bags, linear grooves are formed in the laminated film from the side of the first layer through the printed layer. The film for packaging bags according to Claim 10, wherein the dots are a collection of plural dots, and in the width direction of the linear groove, the separation distance between two adjacent dots among the plural dots is smaller than the aforementioned The width of the linear groove. The film for packaging bags according to claim 11, wherein the center-to-center distance between two adjacent dots among the plurality of dots is equal to or less than the width of the linear groove in the width direction of the linear groove. The film for packaging bags according to any one of claims 10 to 12, wherein the linear groove includes a plurality of deep parts. A packaging bag formed using the film for packaging bags described in any one of Claims 10-13. The packaging bag according to claim 14, wherein the linear groove formed on one side of the packaging bag is linear, and the linear groove formed on the other side is partially curved. The packaging bag according to claim 14, wherein the linear groove formed in the packaging bag is filled with the material of at least one layer of the second layer or the plurality of layers at the peripheral edge. A method for manufacturing a packaging bag. The packaging bag is processed by easy-opening. The manufacturing method has: The stage of forming a laminated film by laminating one or more second layers on the first layer; A step of forming linear grooves on the first layer side of the laminated film; and, The step of sealing the laminated film at the peripheral edge to form a packaging bag, and filling the linear grooves of the laminated film in the peripheral edge with the material of one or more second layers . A packaging bag, which is processed by easy opening and has a laminated film on at least one side thereof, This laminated film has a first layer and one or a plurality of second layers laminated on the first layer, linear grooves are formed on the side of the first layer, and, In this packaging bag, the linear grooves of the laminated film are filled with the material of any one of the one or the plurality of second layers in the sealed peripheral portion.

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