JP2023096931A - Packaging bag for refilling and its manufacturing method - Google Patents

Abstract

To provide a self-standing packaging bag for refilling which has a spout that can suppress longitudinal cracks in the loading direction from occurring.SOLUTION: In a packaging bag for refilling is formed of a laminate which consists of: an outer layer S11 which is a biaxially stretched PET layer; an intermediate layer S12 which is a biaxially stretched PET layer with an aluminum deposition film formed on one surface; and an inner layer 13 which has a linear low-density polyethylene layer with a thickness of 130 μm or more. The surface on which the aluminum deposition film is formed, of the intermediate layer S12 is on the inner layer S13 side. A spout portion 11 is formed in a shape projecting from either a left or right end of the upper part of the packaging bag for refilling 1, and has inclined easy-to-open lines 12, 22 provided from the outer layer S11 side by laser processing.SELECTED DRAWING: Figure 1A

Description

TECHNICAL FIELD The present invention relates to a refill packaging bag and a manufacturing method thereof.

2. Description of the Related Art Conventionally, a pouch container (referred to as a packaging bag) having a spout projecting obliquely upward from a shoulder is known. Such a packaging bag can be easily peeled off by pinching the spout with fingers and being guided by a linear groove (referred to as an inclined easy-to-open line) that crosses the entire width of the spout and tearing. can be opened to form a spout. For example, Patent Document 1 discloses a packaging bag having a spout, which is formed by heat-sealing the periphery of a laminate comprising a base film layer, a barrier layer formed by vapor-depositing aluminum on a stretched polyester layer, and a sealant layer. is disclosed. The inclined easy-to-open line of the spout portion penetrates the base film layer and the barrier layer in the non-heat-sealed portion, and penetrates all the layers in the heat-sealed portion.
Patent document 1 Japanese Patent Application Laid-Open No. 2003-137308

However, laser processing of a laminate containing an aluminum vapor deposition film does not form sufficiently deep linear grooves to guide tearing, and the laminate deviates from the linear grooves and is torn in the longitudinal direction when unsealed. In some cases, a spout could not be formed due to a so-called longitudinal tear.

In a first aspect of the present invention, there is provided a self-supporting refill packaging bag having a spout, wherein the outer layer is a biaxially stretched PET layer, and the intermediate layer is a biaxially stretched PET film formed on one side with an aluminum deposition film. It consists of a laminate composed of a PET layer and a linear low-density polyethylene layer having a thickness of 130 μm or more in the inner layer. Provided is a refill packaging bag having a slanted easy-to-open line protruded from either the right or left end of the upper portion of the refill packaging bag and provided from the outer layer side by laser processing.

In a second aspect of the present invention, there is provided a method for manufacturing a self-supporting refill packaging bag having a spout, comprising the step of laminating an outer layer, an intermediate layer, and an inner layer to form a laminate. , the outer layer is a biaxially oriented PET layer, the intermediate layer is a biaxially oriented PET layer with an aluminum deposition film formed on the inner layer side surface, and the inner layer is a linear low-density polyethylene having a thickness of 130 μm or more. a step of forming a packaging bag using the laminate; a step of forming a spout portion in a projecting shape from either the left or right end of the upper part of the packaging bag; forming an inclined easy-to-open line in the spout portion by processing to form a refill packaging bag.

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

The configuration of the packaging bag according to the present embodiment is shown. It shows the state in which the packaging bag has been opened. FIG. 10 shows a state in which a longitudinal tear occurs in a packaging bag according to a comparative example; FIG. The state before easy-open processing of the laminated body which concerns on a comparative example is shown. The state after easy-open processing of the laminated body which concerns on a comparative example is shown. The state before easy-open processing of the laminated body which concerns on this embodiment is shown. 2 shows a state of the laminate according to the present embodiment after easy-open processing. 4 shows a flow of a manufacturing process of a laminate that has undergone an easy-opening process. The easy-opening process performed on the continuous sheet of the packaging bag is shown. 1 shows a schematic configuration of a laser processing machine;

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

FIG. 1A shows the configuration of a packaging bag 1 according to this embodiment. The packaging bag 1 is a self-supporting refill packaging bag provided with a spout 11 protruding from either the right or left end of the upper portion. Here, a linear groove obliquely crossing the entire width of the pouring portion 11, that is, inclined easy-to-open lines 12 and 22, which will be described later, are provided in the middle of the spout portion 11, and pouring is performed by tearing along the inclined easy-to-open lines 12 and 22. The spout 11 can be easily opened to form a spout. In FIG. 1A 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 packaging bag 1 includes laminates (films) 10 , 20 , 30 .

Laminates 10 and 20 are flexible laminates forming the front surface and the back surface of packaging bag 1, respectively. As an example, the laminates 10 and 20 have a rectangular shape, but three corners are processed to be rounded, and the remaining one corner is formed with a projection that serves as one side of the pouring port 11, and the peripheral edges are mutually or Seal areas for bonding to the laminate 30, that is, seal areas 18a and 28a for bonding to each other at the left end and around the spout, seal areas 18b and 28b for bonding to each other at the right end, and seal areas 18b and 28b for bonding to each other at the upper end Seal areas 18c and 28c for bonding are provided, and seal areas 18d and 28d for bonding to the laminate 30 are provided at the lower end. 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. Laminates 10, 20 include inclined easy-open lines 12, 22 and notches 17b.

The inclined easy-to-open lines 12 and 22 are processed grooves provided on the surfaces of the laminates 10 and 20 to guide tearing of the laminates 10 and 20 when the spout portion 11 of the packaging bag 1 is unsealed. They are formed obliquely over the entire width. At least one inclined easy-open line 12, 22 should be provided. , 22 can guide the tear and prevent unintentional tearing, such as longitudinal tearing.

Notch 17 b is a notch for starting tearing of laminates 10 and 20 , and is formed so as to be continuous with inclined easy-to-open lines 12 and 22 of spout portion 11 . The notches 17b are formed in the sealing regions that are attached to each other, so that the sealing of the packaging bag 1 is maintained.

The laminate 30 is a flexible laminated film forming the bottom surface of the packaging bag 1 . As an example, the laminated body 30 has a rectangular shape, but the four corners are processed to be rounded, and the laminated body 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 seal region 30c sealed with the seal region 18d of No. 10 and a seal region 30d sealed with the seal region 28d of the laminate 20 are provided in the rear half. Two sets of semicircular cutouts 30e for bonding the inner surfaces of the laminates 10 and 20 to each other are provided at the left and right ends of the sealing regions 30c and 30d.

The packaging bag 1 is formed using the members described above. First, the inner surfaces of the laminates 10 and 20 are opposed to each other, and the laminate 30 is folded in half about the reference line L30, with the folded side facing upward, one piece facing the laminate 10 and the other piece facing the laminate 20. between the laminates 10 and 20. Next, the peripheral edges of the laminates 10, 20, 30, that is, the seal areas 18a, 28a and the seal areas 18b, 28b of the laminates 10, 20, the seal area 18d of the laminate 10, the seal area 30c of the laminate 30, and the laminate 20 and the seal area 30d of the laminate 30 are heat-sealed (heat-sealed). At this time, a part of the sealing region 18d of the laminated body 10 and a part of the sealing region 28d of the laminated body 20 are directly fused through the notch 30e of the laminated body 30 . Next, after providing the inclined easy-to-open lines 12 and 22 by using a laser processing device, they are cut to a specified size, corner cut processing, and processing of notches 17b are performed. 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 laminates 10, 20 are heat-sealed. As a result, the central region 30a of the laminated body 30 folded in half widens to form a concave bottom surface, and the lower ends of the laminated bodies 10 and 20 are fixed through the notches 30e of the laminated body 30 at the left and right ends. In addition, the left and right centers widen to form legs, so that the packaging bag 1 constitutes a standing pouch that can stand on its own.

FIG. 1B shows the packaging bag 1 in which the spout portion 11 has been opened along the inclined easy-to-open lines 12 and 22 . When opening the packaging bag 1, the user grasps the tip and base ends of the spout 11 with the left and right fingers, respectively, and pulls the upper side toward the lower side of the notch 17b or pushes it backward. The notch 17b is widened, and the spout part 11 is torn to the other side along the inclined easy-to-open lines 12, 22 continuous with them. As a result, the upper end of the spout portion 11 is cut off, the packaging bag 1 is opened, and the spout is formed.

FIG. 1C shows a packaging bag 1d according to a comparative example in which a longitudinal tear has occurred. Since the spout 11 protrudes obliquely, a large force is applied downward (loading direction) to the spout 11 when pinching and tearing the approximate center of the spout 11 with fingers. If the inclined easy-to-open lines 12, 22 are not deep enough, the downward force may cause the tear to deviate from the inclined easy-to-open lines 12, 22, resulting in a vertical tear 1da. This tendency is often observed when biaxially oriented PET is used for the outer layer, and thus becomes a problem particularly when biaxially oriented recycled PET is used as the outer layer for the purpose of environmental friendliness.

In order to suppress such vertical tearing, the present inventors first examined a method of easy-open processing (laser processing).

官能評価基準：
Ａ：縦裂け発生が０袋、
Ｂ：縦裂け発生が１～２袋、
Ｃ：縦裂け発生が３～５袋、
Ｒ：縦裂け発生が６袋以上。 Table 1 shows conditions 1 to 8 of easy-open processing (laser processing). According to each condition, 10 easy-to-open packaging bags were prepared by setting the laser output and scanning speed, respectively, and the pouring port 11 was actually torn to evaluate the number of vertical tears that occurred on a 4-grade scale. . Here, the laser output is given with respect to the reference laser output of 21 to 22 W for processing the laminated body on one side and the reference laser output of 25 to 26 W for processing the laminated body on the other side. This is the speed at which the laminate is scanned.

Sensory Evaluation Criteria:
A: 0 bags with vertical tearing,
B: 1 to 2 bags with longitudinal cracks,
C: 3 to 5 bags with longitudinal cracks,
R: 6 or more bags with longitudinal cracks.

Under conditions 1 to 3, by increasing the laser output to 100% with respect to the scanning speed Y (medium speed), longitudinal tearing of the packaging bag was reduced. Further, under conditions 4 to 8, by increasing the laser output to 50, 60, 70, 80, and 90% of the scan speed X (low speed), longitudinal tearing of the packaging bag was reduced. In particular, no longitudinal crack occurred at a laser output of 90%.

Thus, it was found that longitudinal tearing can be significantly suppressed by increasing the laser output and decreasing the scan speed. However, if the laser output decreases due to long-term use, for example, vertical tearing may occur, so the laser output must be strictly controlled to prevent vertical tearing. Also, lowering the scan speed can lead to lower production speeds. Therefore, the present inventors have studied how to suppress vertical tearing by using the structure of the laminate.

FIG. 2A shows a cross-sectional structure of a laminate S' according to a comparative example. Here, in order to explain the basic configuration of the laminate S', the cross-sectional structure of the laminate S' in the state before the easy-open processing (the state before the inclined easy-open lines 12 and 22 are formed) is shown. The laminate S' is formed by laminating an outer layer S11, a printed layer S14, an intermediate layer S12', and an inner layer S13. The outer layer S11 is a layer that protects the intermediate layer S12′ from rubbing or the like, the printed layer S14 is a layer on which a printed matter is provided, the intermediate layer S12′ is a barrier layer that prevents light from entering, and the inner layer S13 is a sealant. layer. The intermediate layer S12' includes a biaxially stretched PET layer S122 on the inner layer S13 side and an aluminum deposition film S121 on the outer layer S11 side.

FIG. 2B shows a cross-sectional structure of a laminate S′ according to a comparative example that has undergone easy-opening processing with a laser. A linear groove 12 is formed in the laminate S' by an easy-opening process. However, since the laser beam is reflected by the aluminum deposition film S121, the inclined easy-open line 12 (linear groove 12) penetrates only the outer layer S11 and does not reach the intermediate layer S12'. Therefore, in the configuration of the laminate S′ according to the comparative example, the sufficiently deep inclined easy-to-open lines 12 and 22 are not formed, which may cause the packaging bag 1 to tear vertically.

FIG. 3A shows a cross-sectional structure of a laminate (packaging bag film) S according to this embodiment. Here, in order to explain the basic configuration of the laminate S, the cross-sectional structure of the laminate S in a state before easy-open processing (before the inclined easy-open lines 12 and 22 are formed) is shown. The laminate according to the present invention has a three-layer structure of an outer layer, an intermediate layer, and an inner layer, but an adhesive layer and a printed layer may be provided between each layer. The laminate S of FIG. 3A includes an outer layer S11, an intermediate layer S12, an inner layer S13, a printed layer S14, and an adhesive layer (not shown).

The outer layer S11 is a biaxially stretched PET (polyethylene terephthalate) layer, and is formed with a thickness of, for example, 12 μm, so that it has high transparency and non-stretchability. A biaxially oriented PET layer is formed by, for example, a tubular method or a tenter method, has high toughness, and is also suitable as a base layer for printing. The biaxially stretched PET layer of the outer layer S11 may be formed using biaxially stretched PET regenerated by mechanical recycling. By using a biaxially oriented PET layer regenerated by mechanical recycling as the biaxially oriented PET layer of the outer layer S11, it is possible to provide a refill packaging bag with improved environmental friendliness.

The intermediate layer S12 is formed by forming an aluminum deposition film S121 on one side of a biaxially stretched PET layer S122. do. The intermediate layer S12 is formed with an aluminum deposition film S121 to barrier the contents of the refill packaging bag from light, gases such as oxygen, moisture, and the like. Here, the aluminum deposition film has the advantage that it can be a barrier not only to oxygen and water but also to light, and that the film can be easily formed by metal deposition. However, as described above, the aluminum deposition film S121 may reflect the laser beam for the easy-opening process, thereby preventing the formation of linear grooves in the lower layer (see FIG. 2B). Therefore, by providing the aluminum deposition film S121 on the inner layer S12 side as shown in FIG. A linear groove can be formed over the entire thickness of the portion of S12 excluding the aluminum deposited film S121 to obtain an inclined easy-open line deep enough to guide tearing.

The inner layer S13 is a linear low-density polyethylene layer and has a thickness of 130 μm or more to prevent the contents of the packaging bag 1, such as detergent, from penetrating into the inner layer S13, thereby enhancing adhesion between the layers of the laminate S. power can be maintained. In addition, it has a high rigidity that allows it to stand on its own when a standing pouch is formed, and constitutes a sealant layer that is suitable for heat sealing by melting at 100 to 130°C.

The printed layer S14 is an extremely thin layer sandwiched between the outer layer S11 and the intermediate layer S12. The printed layer S14 is printed on the inner surface of the outer layer S11 or the outer surface of the intermediate layer S12, for example, by letterpress printing (flexo), intaglio printing (gravure), planographic printing (offset), or the like. With such a configuration, it is possible to protect the printed layer S14 from external stimulation with the outer layer S11 while improving the appeal of the product by showing an image, a trademark, etc. on the printed layer S14.

FIG. 3B shows the cross-sectional structure of the laminate S subjected to easy-opening processing by laser. A linear groove 12 is formed in the laminate S by an easy-opening process. Since the aluminum vapor-deposited film S121 is on the inner layer S13 side, the linear grooves of the inclined easy-open lines 12 and 22 are formed by passing the laser light through the biaxially stretched PET layer S122 of the outer layer S11 and the intermediate layer S12. The inclined easy-to-open lines 12 and 22, which are formed through the axially stretched PET layer S122, are sufficiently deep to suppress longitudinal tearing of the packaging bag 1 shown in FIG. 1C. Here, the linear groove formed by laser processing is different from the linear groove formed by using a cutter blade or the like, and the film member deformed by being irradiated with the laser beam rises on both sides of the groove, forming a mountain-like shape. A shoulder is formed (not shown). Since this shoulder serves as a guide when tearing the packaging bag, the laser-processed linear groove is suitable as an opening line.

Thus, in the self-supporting refill packaging bag 1 having the spout portion 11, the outer layer S11 is a biaxially stretched PET layer, the intermediate layer S12 is a biaxially stretched PET layer having an aluminum deposition film S121 formed on one side, The inner layer S13 is composed of a laminated body S composed of a linear low-density polyethylene layer having a thickness of 130 μm or more, and the surface of the intermediate layer S12 on which the aluminum deposition film S121 is formed is the inner layer S13 side, and the spout portion 11 is formed in a projecting shape from either the left or right end of the upper part of the refill packaging bag 1, and has inclined easy-to-open lines 12 and 22 provided from the outer layer S11 side by laser processing. , gas, and water, and at the same time, when forming the spout by tearing the spout part 11 in an oblique direction, it is possible to provide a refill packaging bag capable of suppressing longitudinal tearing in the load direction.

As the laminate of the non-heating pouch container, a laminate of the outer layer S11, the intermediate layer S12, and the inner layer S13 can be used. The outer layer S11 is suitable for laminating the printed layer S14, the intermediate layer S12 has a high barrier property, and the inner layer S13 is suitable as a heat seal layer.

FIG. 4 shows the flow of the manufacturing process S100 of the laminate S subjected to the easy-opening process according to this embodiment.

In step S101, a biaxially stretched PET layer having a printed layer S14 formed on one side by a gravure printer or the like is used as the outer layer S11, a biaxially stretched PET layer S122 having an aluminum deposition film S121 formed on one side as the intermediate layer S12, and an inner layer S13. A linear low-density polyethylene layer having a thickness of 130 μm or more is prepared as a layer, and these layers are laminated to form a laminate S. At the time of lamination, the aluminum deposition film S121 of the intermediate layer S12 is made to face the inner layer S13 side. The lamination may be performed by dry lamination in which the layers are thermocompressed using an adhesive, by extrusion coat lamination in which the material of the inner layer S13 is melted and extruded onto the intermediate layer S12 in the form of a film, or by heat lamination. A solvent-free adhesive, such as a plastic urethane-based adhesive, may be used for non-sol lamination (also referred to as solvent-free lamination) that adheres without a drying process.

In step S102, the laminate S formed in step S101 is cut to form an original film (continuous body of laminate 10 and laminate 20) having a determined width. Here, when a defective portion is detected in the laminate S in the lamination step of step S101, a flag is inserted into the film edge. Therefore, the flag may be used as a mark to cut and remove the defective portion, and the divided laminated film may be connected. Furthermore, powder may be dusted on the inner surface side in order to improve the slipperiness of the film.

In step S103, a spout embossing process is applied to the part of each raw film that will become the spout portion 11 . A portion of each of the laminates 10 and 20 to be the spout portion 11 is heated with a heater, a convex mold is placed on the inner layer S13 side and a concave mold is placed on the outer layer S11 side, and is pressed so as to spread to the outer layer S11 side, Embossing is applied to the part that will become the pouring port 11 .

In step S104, the two raw films and the bottom film are overlapped, and the bottom portion of the packaging bag 1 is heat-sealed (bottom seal), and both sides and the spout periphery are heat-sealed (side seals). to form a continuous sheet S of the packaging bag 1 . In the bottom seal, the bottom portion is heated by a heater to melt the inner layer S13, and the two raw films are pressed together to adhere to each other and cooled. In the side seal, the same process is performed on both sides of the packaging bag 1 and around the spout.

In step S105, laser processing is performed on the continuous sheet S of the packaging bag 1 formed in step S104 to form inclined easy-to-open lines 12 and 22. As shown in FIG.

FIG. 5 shows an easy-opening process performed on the continuous sheet S of the packaging bag 1. As shown in FIG. In the continuous sheet S of the packaging bag 1, two packaging bags 1 are arranged so that the upper sides of the two packaging bags 1 are adjacent to each other, that is, so that the spout portions 11 are adjacent to each other, and the set of the two packaging bags 1 is , continue in both directions of the packaging bag 1 . Therefore, by irradiating two adjacent spout portions 11 of the continuous sheet S conveyed in the direction of the arrow with a V-shaped laser, the inclined easy-to-open lines are efficiently formed on the two packaging bags 1 .

In step S106, the continuous sheet S of the packaging bag 1 that has been processed in step S105 is cut to a specified size, and notch cut processing and corner cut processing are further performed. After that, the processing state is image-inspected with an in-line camera, and the specified number is stacked and delivered and packed.

In this way, the method for manufacturing the self-supporting refill packaging bag 1 having the spout 11 protruding from either the left or right end of the upper portion comprises laminating the outer layer S11, the intermediate layer S12, and the inner layer S13. The outer layer S11 is a biaxially stretched PET layer, and the intermediate layer S12 is a biaxially stretched PET layer having an aluminum deposition film S121 formed on the inner layer S13 side. , the inner layer S13 is a linear low-density polyethylene layer having a thickness of 130 μm or more, and performing laser processing from the outer layer side of the laminate to form an inclined easy-to-open line in the spout portion. and a step of making the packaging bag 1 using the laminate S, so that the aluminum deposition film S121 blocks light, gas, and water, and at the same time, tears the spout portion 11 in an oblique direction to open the spout. It is possible to provide a refill packaging bag that can suppress the occurrence of longitudinal tears in the direction of load when forming the.

FIG. 6 shows a schematic configuration of the laser processing machine 50. As shown in FIG. The laser processing machine 50 is a device that irradiates the continuous sheet S of the packaging bag with a laser beam in step S105 to form the inclined easy-to-open lines 12 and 22, and includes a light source 51, a reflecting element 52, a light collecting optical system 53, and A scanning optical system 54 is provided. These devices form the inclined easy-to-open line 12 on the upper surface of the continuous sheet S, and a similar device to form the inclined easy-to-open line 22 on the lower surface of the continuous sheet S is provided.

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. As long as the inclined easy-to-open lines 12 and 22 can be formed on the continuous sheet S of the packaging bag 1, an arbitrary laser light source with an arbitrary wavelength may be employed, and a high-intensity light beam is not limited to laser light. Other light sources that emit

The reflecting element 52 is an optical element that reflects the laser light and directs it toward the continuous sheet S. 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 continuous sheet S. As shown in FIG.

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

A laser beam emitted from a light source 51 is directed toward the continuous sheet S through a reflecting element 52, forms a spot on the continuous sheet S by a condensing optical system 53, and is conveyed in the direction of an arrow by a scanning optical system 54. The continuous sheet S is two-dimensionally scanned. Thereby, the continuous sheet S is formed with inclined easy-to-open lines 12, 22, and the like.

(Example 1)
A biaxially stretched PET layer having a thickness of 12 μm was prepared and used as an outer layer. A biaxially stretched PET layer having a thickness of 12 μm and having an aluminum deposition film formed on one side thereof was prepared as an intermediate layer. A linear low-density polyethylene layer with a thickness of 130 μm was prepared, and this layer was used as an inner layer. to obtain a laminate. This laminate was used to form 10 packaging bags having a spout portion and an inclined easy-to-open line. The easy-open processing was performed at a laser output of 50% and a scan speed of Y (medium speed).

(Example 2)
Ten packaging bags were formed in the same manner as in Example 1, except that the easy-open processing was performed at a laser output of 70% and a scan speed of Z (high speed).

(Comparative example 1)
Ten packaging bags were formed in the same manner as in Example 1, except that the aluminum deposition film of the intermediate layer was directed to the outer layer side.

(Comparative example 2)
Ten packaging bags were formed in the same manner as in Example 2, except that the aluminum deposition film of the intermediate layer was directed to the outer layer side.

官能評価基準：
Ａ：１０袋中、縦裂け発生が０袋、
Ｒ：１０袋中、縦裂け発生が６袋以上。

Sensory Evaluation Criteria:
A: Out of 10 bags, 0 bags with longitudinal tear,
R: Out of 10 bags, 6 or more bags had longitudinal cracks.

In both Examples 1 and 2, in which the aluminum vapor deposition film of the intermediate layer was present on the inner layer side, no longitudinal tear occurred in all 10 bags, regardless of the laser processing conditions. On the other hand, in Comparative Examples 1 and 2, in which the intermediate aluminum vapor deposition film was present on the outer layer side, longitudinal cracks occurred in 6 or more of the 10 bags even when the laser processing conditions were changed. From this, it can be seen that the configuration of the laminate of the present invention can easily realize a packaging bag that does not cause vertical tearing without requiring detailed conditions for laser processing.

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 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 the devices, systems, programs, and methods shown in the claims, the specification, and the drawings is particularly "before", "before etc., and it should be noted that it can be implemented in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the specification, and the drawings, even if the description is made using "first," "next," etc. for the sake of convenience, it means that it is essential to carry out in this order. not a thing

1, 1d packaging bag 1da vertical split 10,20,30 laminate (film) 12,22 inclined easy-open line (linear groove) 17b notch 18a, 18b, 18c, 18d, 28a, 28b, 28c, 28d Seal area 30a Center area 30c, 30d Seal area 30e Notch 50 Laser processing machine 51 Light source 52 Reflecting element 53 Condensing optical system 54... Scanning optical system 60... Bag making device S, S'... Laminated body (packaging bag film, continuous sheet) S100... Manufacturing process S11... Outer layer S12, S12'... Intermediate layer S121... Aluminum vapor deposition Membrane, S122... biaxially stretched PET layer, S13... inner layer, S14... printed layer.

Claims (6)

A self-supporting refill packaging bag having a spout,
A laminate composed of a biaxially stretched PET layer as an outer layer, a biaxially stretched PET layer having an aluminum deposition film formed on one side as an intermediate layer, and a linear low density polyethylene layer having a thickness of 130 μm or more as an inner layer,
The surface of the intermediate layer on which the aluminum deposition film is formed is the inner layer side,
A refill packaging bag, wherein the spout portion is formed in a projecting shape from either one of the left and right ends of the upper portion of the refill packaging bag, and has an inclined easy-to-open line provided from the outer layer side by laser processing. 2. The refill packaging bag according to claim 1, wherein said outer layer is a biaxially oriented PET layer regenerated by mechanical recycling. 3. The refill packaging bag according to claim 1, wherein a plurality of said inclined easy-open lines are formed. The refill packaging bag according to any one of claims 1 to 3, wherein the laminate has a printed layer between the outer layer and the intermediate layer. A method for manufacturing a self-supporting refill packaging bag having a pouring spout projecting from either the left or right end of the upper portion, comprising:
A step of laminating an outer layer, an intermediate layer, and an inner layer to form a laminate, wherein the outer layer is a biaxially stretched PET layer, and the intermediate layer has an aluminum deposition film formed on the inner layer side surface. a biaxially oriented PET layer, wherein the inner layer is a linear low density polyethylene layer having a thickness of 130 μm or more;
a step of performing laser processing from the outer layer side of the laminate to form an inclined easy-to-open line in the spout;
a step of making a packaging bag using the laminate;
A method for manufacturing a refill packaging bag. 6. The method of manufacturing a refill packaging bag according to claim 5, comprising the step of forming a printed layer between said outer layer and said intermediate layer.

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