JP6729173B2 - Packaging bag, laminated sheet and manufacturing method thereof - Google Patents

Description

The present invention relates to a resealable packaging bag, a laminated sheet for forming the packaging bag, and a method for manufacturing the laminated sheet.

Most of the products are distributed in the market in a packaging bag. For example, for packaging bags used for food such as confectionery products, after opening, take out a part of the food and reseal it to ensure airtightness and prevent dust from entering the inside. There is one (for example, refer to Patent Document 1).

The resealable packaging container (packaging bag) disclosed in Patent Document 1 will be described with reference to FIG.
4A and 4B are schematic diagrams showing the configuration of the resealable packaging container disclosed in Patent Document 1, where FIG. 4A is an overall perspective view of the packaging container, and FIG. 4B is an opened state in a sealed (resealed) state. 4A is a cross-sectional view of the periphery of the portion, FIG. 3A is a cross-sectional view taken along the line A1-A1 of FIG.

As shown in FIG. 4A, the packaging container 01 is configured by providing an opening part 02 on the top surface (upper surface) of the envelope 01A that wraps the contents. The unsealing section 02 is formed by providing U-shaped cuts 011a and 012a described later on the top surface (upper surface).

The envelope 01A is formed by molding the constituent material 010 into a bag shape. As shown in FIGS. 4B and 4C, the constituent member 010 is formed by laminating an outer constituent member 011 and an inner constituent member 012 and permanently bonding them with a laminating adhesive 03 (that is, so that they cannot be separated). Configured. The unsealing part 02 provides the U-shaped cut 011a on the outer component 011 and the laminating adhesive 03, and the U-shaped cut 012a is formed on the inner side of the U-shaped cut of the cut 011a. It is configured by being provided in the constituent member 012.
Between the notches 011a and 012a that define the unsealing portion 02, that is, a U-shaped peripheral region (hereinafter, also referred to as "unsealing portion peripheral region") 02a of the unsealing portion 02 is an enclosure body 01A' (from the enclosure 01A. A pressure sensitive adhesive 04 is applied in place of the laminating adhesive 03, which functions as an adhesive margin for the unsealed portion 02). Since the pressure-sensitive adhesive 04 has a constant adhesiveness, the unsealed portion peripheral region 02a is adhered to the envelope body 01A' in a peelable/re-adhesive manner by the pressure-sensitive adhesive 04. This allows the packaging container 01 to be resealed after it has been opened.

Specifically, in the closed state of the unsealing portion 02 shown by the solid line in FIG. 4A, as shown in FIG. 4B, the pressure-sensitive adhesive 04 on the lower surface of the unsealing portion peripheral region 02a is the enclosure. The packaging container 01 is sealed (resealed) by being bonded to the inner constituent member 012 of the main body 01A'.
On the other hand, in the closed state of the unsealing part 02 shown by the chain double-dashed line in FIG. 4(a), as shown in FIG. 4(c), the pressure-sensitive adhesive 04 on the lower surface of the unsealing part peripheral region 02a is The inner component 012 of 01A' is peeled off.

Japanese Patent Publication No. 2008-502555

In the packaging container 01 disclosed in Patent Document 1, the pressure sensitive adhesive 04 is applied to the U-shaped opening portion peripheral region 02a, and the laminating adhesive 03 is applied to the other regions.
When the laminating adhesive 03 enters the opening part peripheral area 02a and covers the pressure-sensitive adhesive 04, the opening part peripheral area 02a and the enclosure body 01A' are permanently (substantially (substantially) formed by the laminating adhesive 03). They are adhered to each other so that they cannot be peeled off), and the unsealing portion 02 cannot be unsealed.
On the other hand, if a gap is created between the laminating adhesive 03 and the pressure-sensitive adhesive 04, both the adhesives 03 and 04 will be absent in this gap, and the outer component 011 and the inner component 012 is not adhered, and the outer constituent member 011 and the inner constituent member 012 are unnecessarily separated.
Therefore, the laminating adhesive 03 and the pressure-sensitive adhesive 04 are respectively applied so that the application area of the laminating adhesive 03 and the application area of the pressure-sensitive adhesive 04 do not overlap with each other and a gap is not formed in both areas. It must be applied accurately in a predetermined pattern, and high manufacturing accuracy is required.

The present invention has been made in view of above problems, and an object thereof is to provide a laminated sheet and a method for producing a laminated sheet forming the packaging bag and a packaging bag was to be able to simplify the manufacturing.

(1) In order to achieve the above object, in the packaging bag of the present invention, at least the top surface is made of a flexible laminated sheet, and the lid is provided on the top surface. The sheet includes a base material layer facing outward, a seal layer facing inward, and an adhesive layer provided between the base material layer and the seal layer, and the lid portion includes the base material layer. A surface of the base material layer facing the pressure-sensitive adhesive layer, which is defined by a first notch provided in the first cut and a second notch provided in the seal layer on the inner peripheral side of the first cut. In, between the first notch and the second notch and provided on the peripheral portion of the lid, the adherence to the adhesive layer is lower than that of the base material layer, but re-adhesion is possible. And a release layer.

(2) It is preferable that the seal layer has a gas barrier layer laminated on a surface facing the adhesive layer, and the second cut is provided only in the seal layer except for the gas barrier layer.

(3) In order to achieve the above object, the laminated sheet of the present invention is a laminated sheet that constitutes at least the top surface of a packaging bag having a lid portion provided on the top surface, and a base layer, A seal layer, an adhesive layer provided between the base material layer and the seal layer, a first notch provided in the base material layer to define the lid portion, and a first cut in the seal layer. A second notch which is provided on the inner peripheral side of the first notch and which defines the lid together with the first notch, and the first notch and the first notch on the surface of the base material layer facing the adhesive layer. A peeling layer which is provided between the second notch and in the peripheral portion of the lid portion , and which has a lower adhesiveness to the adhesive layer than the base material layer but allows re-adhesion. I am trying.

(4) In order to achieve the above object, the method for producing a laminated sheet of the present invention is a method for producing a laminated sheet that constitutes at least the top surface of a packaging bag having a lid on the top surface. The adhesive layer is formed on the seal layer with a constant thickness, an adhesive layer forming step, and in the peripheral portion of the base layer where the lid is formed, the adhesiveness to the adhesive layer is higher than that of the base layer. A release layer is provided, which is low but is capable of re-adhesion , and a release layer forming step, and an integration step of adhering the base material layer and the seal layer with the adhesive layer and the release layer facing each other. It is characterized by that.

According to the present invention, the peeling layer having low adhesiveness to the adhesive layer is provided between the first notch and the second notch, which serve as an adhesion margin of the lid portion to the top surface of the packaging bag. This allows the lid to be peeled off from the adhesive layer and the packaging bag to be opened and reopened, and the release layer to be adhered to the adhesive layer and the packaging bag to be resealed simply by pushing the lid back gently to the top surface. be able to.
In addition, the degree of adhesion between the adhesive layer and the peeling layer is adjusted so that peeling (opening and reopening) and re-adhesion (resealing) from the top surface of the lid can be repeated. Since it is premised that the layer and the release layer are superposed on each other, it is not necessary to form the adhesive layer in a pattern so as to avoid the release layer, and the adhesive layer can be easily formed.
Therefore, the resealable packaging bag can be easily manufactured.

It is a perspective view showing the whole packaging bag composition of one embodiment of the present invention. It is a schematic diagram for demonstrating the structure of the lid part and laminated|stacked sheet which concern on one Embodiment of this invention, (a) is B1-B1 sectional drawing of FIG. 1, (b) is B2-B2 sectional drawing of FIG. It is a figure and a figure showing the state where a lid part was closed, and (c) is a B3-B3 sectional view of Drawing 1, and is a figure showing the state where a lid part was opened. It is a schematic diagram which shows the principal part structure of the manufacturing apparatus of the packaging bag which concerns on one Embodiment of this invention. It is a schematic diagram which shows the structure of the resealable packaging container disclosed by patent document 1, (a) is a whole perspective view of a packaging container, (b) is a cross section of the opening part periphery in a sealing (resealing) state. It is a figure, A1-A1 sectional view of (a), (c) is an A2-A2 sectional view of (a) which is a sectional view of the opening part periphery in an opened (reopening) state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are merely examples, and there is no intention to exclude various modifications and application of techniques that are not explicitly shown in the following embodiments. The configurations of the following embodiments can be variously modified and implemented without departing from the spirit thereof.
In the following description, the upper and lower sides are determined with the lid portion facing upward, the longitudinal direction of the packaging bag is defined as “length direction L”, and the lateral direction of the packaging bag orthogonal to the longitudinal direction is defined as “width direction W”. ".
Moreover, the inner space side of the packaging bag will be described as “inner side” or “inner side”, and the opposite side will be described as “outer side” or “outer side”.
In addition, the direction approaching the center CP of the lid (the intersection of the center line in the length direction L and the center line in the width direction W) is referred to as the “inner circumference side”, and conversely the side away from the center CP is the “outer circumference”. Will be described as “side”.

[1. Overall structure of packaging bag]
The overall configuration of the packaging bag according to the embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a perspective view showing the overall configuration of the packaging bag of this embodiment.
The packaging bag 1 is configured to include a lid portion 3 provided on a top surface (upper surface) 2 thereof so as to be resealable.
In the packaging bag 1, one flexible laminated sheet 10 (the laminated sheet 10 will be described later) is bent into a tubular shape, the ends thereof are overlapped, and the overlapped ends are heat-sealed, for example. It is made into a bag. In this embodiment, as the heat-sealing portion, the seal portion 11a along the length direction L and the seal portions 11b and 11c along the width direction W are formed. Note that the seal portion 11a is shown over only part of both ends for convenience, but is formed over the entire length of the packaging bag 1.
The lid portion 3 is formed in the central portion of the top surface 2 of the packaging bag 1 and separated from the bag body (a portion of the packaging bag 1 excluding the lid portion 3) except for one end (base end) 31 in the longitudinal direction L. It is possible. A semicircular knob portion 32 is provided at the other end (tip) in the longitudinal direction L of the lid portion 3, and the knob portion 32 is grasped and lifted as shown by a chain double-dashed line in FIG. Thus, an opening 20 appears along the longitudinal direction L at the center of the top surface 2. Articles (for example, confectionery products such as potato chips, biscuits, and cookies) stored in the packaging bag 1 can be taken out from the opening 20. Therefore, the opening 20 is hereinafter referred to as "take-out port".

[2. Structure of laminated sheet and lid]
The configurations of the laminated sheet 10 and the lid portion 3 will be described with reference to FIG. 2 in addition to FIG. 1 described above.
2A and 2B are schematic diagrams for explaining the configurations of the lid portion 3 and the laminated sheet 10 according to the embodiment of the present invention, in which FIG. 2A is a sectional view taken along line B1-B1 of FIG. 1, and FIG. 1 is a sectional view taken along line B2-B2 of FIG. 1 showing a state in which the lid portion 3 is closed, and FIG. 3C is a sectional view taken along line B3-B3 in FIG. 1 showing a state where the lid portion 3 is open. Note that, in FIG. 2, for convenience, the laminated sheet 10 and each layer constituting the laminated sheet 10 are shown thicker.

As shown in FIGS. 2A, 2B and 2C, the laminated sheet 10 includes a flexible base material layer 12, a flexible seal layer 14, a base material layer 12 and an inner layer 14. The adhesive layer 13 interposed between the base layer 12 and the peeling layer 15 partially provided on the back surface (the surface facing the adhesive layer 13) 12b of the base material layer 12 are integrally provided.

The base material layer 12 is a layer that is directed outward when the packaging bag 1 is formed (herein, the "base material layer 12" is also referred to as "outer layer 12"). The outer layer 12 includes a main body layer 121 that forms the outermost surface of the packaging bag 1, and a printing layer 122 that is laminated on the adhesive layer 13 side of the main body layer 121.
The main body layer 121 is formed of a printable flexible material, and it is preferable to use a material having excellent puncture strength, tensile strength, impact resistance and the like. In the present embodiment, the main body layer 121 is formed using PET (polyethylene terephthalate), but any flexible material that can be printed can be used without being limited to PET. As a material that can be used for the main body layer 121 other than PET, specifically, for example, nylon, OPP (oriented polypropylene), or the like is preferably used.
The print layer 122 is a layer mainly provided for decoration, and is a layer formed by printing on the back surface of the main body layer 121 (in other words, a layer formed by ink).

The pressure-sensitive adhesive layer 13 is composed of a pressure-sensitive adhesive (generally referred to as a pressure-sensitive adhesive) and adheres the outer layer 12 and the inner layer 14, and the pressure-sensitive adhesive used in the present invention is applied to the outer layer 12 and the inner layer 14. On the other hand, it has strong adhesion. Here, the strong tackiness means tackiness of an adhesive strength that the outer layer 12 and the inner layer 14 cannot be peeled off without damage. As the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 13, one having a strong pressure-sensitive adhesive property under the environmental conditions (temperature range, humidity range, etc.) in which the packaging bag 1 is used is appropriately selected.
In this embodiment, a hot-melt type adhesive is used as the adhesive forming the adhesive layer 13. As the hot-melt type pressure-sensitive adhesive, those of ethylene vinyl acetate type, polyolefin type, polyamide type, polyurethane type, synthetic rubber type and acrylic type are used. Of these, synthetic rubber type and acrylic type are preferably used.
Further, as the adhesive forming the adhesive layer 13, an adhesive other than the hot melt adhesive can be used.

The seal layer 14 is a layer that is directed inward (inner space side) when the packaging bag 1 is formed (herein, "the seal layer 14" is also referred to as "inner layer 14"). The inner layer 14 includes a fusing layer 142 that forms the innermost surface of the packaging bag 1 and serves as a main layer of the inner layer 14, and a gas barrier layer 141 that is laminated on the adhesive layer 13 side of the fusing layer 142.
In this embodiment, an aluminum vapor deposition layer vapor-deposited on the fusion bonding layer 142 is used as the gas barrier layer 141, but the gas barrier layer 141 is not limited to the aluminum vapor deposition layer. For example, the gas barrier layer 141 may be formed by adhering an aluminum foil to the fusing layer 142, or may be formed of a material other than aluminum as long as the material has a high gas barrier property. As a material other than aluminum that can be used for the gas barrier layer 141, for example, a vapor deposition layer of aluminum oxide or silicon oxide may be provided to form the gas barrier layer 141.

The fusion bonding layer 142 is a layer that becomes the innermost surface when the packaging bag 1 is formed as described above. That is, when the laminated sheet 10 is bent into a tubular shape to form the packaging bag 1, the laminated sheet 10 is bent so that the fusion layers 142 are inside (in other words, the fusion layers 142 face each other). .. The fusing layer 142 is formed of a heat fusing material, and the fusing layers 142 stacked in the width direction W are heat-sealed (heat fusing) to form the sealing portions 11a, 11b, 11c. (See FIG. 1) is formed.
Specifically, the sealing portions 11c are formed as shown in FIG. 2A by heat-sealing the fusion-bonding layers 142 that are laminated along the width direction W. Similarly, the sealing portion 11b is formed by heat-sealing the fusion-bonding layers 142 that are stacked along the width direction W, and the fusion-bonding layers 142 that are stacked along the length direction L are joined together. The sealing portion 11a is formed by heat sealing.
In this way, the laminated sheet 10 is formed into the packaging bag 1 by bending the laminated sheet 10 into a tubular shape to form the seal portions 11a, 11b, and 11c.

In the present embodiment, CPP (unstretched polypropylene film) is used for the fusing layer 142, but the fusing layer 142 is limited to CPP as long as it has heat sealability (heat fusion property). Not done.
Examples of materials other than CPP that can be used for the fusing layer 142 include LDPE (low density polyethylene), HDPE (high density polyethylene), EVA (ethylene/vinyl acetate copolymer), and the like.

The peeling layer 15 is provided on the back surface (inner side surface) of the lid portion 3 at a peripheral edge portion 3R shown by hatching in FIG. 1 (that is, a bonding margin of the lid portion 3 to the top surface 2).
Here, the configuration of the lid portion 3 will be described. As shown in FIG. 1, the lid portion 3 is formed by making a notch (first notch) 33 on the front surface (outer surface) of the top surface 2 and a notch (second notch) 34 on the back surface (inner surface). It The notch 33 is U-shaped, and the notch 34 is a rectangular ring-shaped one that is formed along the notch 33 with an interval on the inner peripheral side (center CP side) of the notch 33. The notch 34 may be U-shaped like the notch 33.
2B shows a state before opening (before opening the lid portion 3), and as shown in FIG. 2B, the cut 33 is formed by penetrating the outer layer 12 in the thickness direction. 34 is formed in the inner layer 14 leaving the gas barrier layer 141. The reason why the gas barrier layer 141 is not cut is to prevent deterioration of the gas barrier property, and thus when the stored product contains oil such as potato chips, it is possible to prevent the oil from contacting the outside air and oxidizing. it can. In the present embodiment, further, the cut 34 is formed by leaving a part of the fusion bonding layer 142 on the gas barrier layer 141 side so that the gas barrier layer 141 is not cut when the packaging bag 1 is manufactured ( I have a margin in production).

The notch in the present invention includes both a continuous cutting line and a perforation formed by intermittent cutting portions. In the present embodiment, the cuts 33 and 34 are perforations except for the cut 33b that defines the knob 32, which is shown by a solid line or a broken line in FIG. The notch 33b that defines the picking portion 32 is a continuous cut so that it can be easily picked with a finger, but a rough sewing machine (having a short mutual interval between cutting portions) that can be easily cut by picking with a finger. It may be defined by the eyes.
Further, in the present embodiment, the cuts 33 and 34 are accommodated by providing appropriate intervals in the longitudinal direction L and providing uncut portions 33a and 34a at the same position (or substantially the same position) in the longitudinal direction L. The opening range of the lid portion 3 can be gradually expanded according to the use of the product.
Note that only one of the uncut portion 33a and the uncut portion 34a may be provided.

Then, the peeling layer 15 is provided between the outer layer 12 and the adhesive layer 13 on the peripheral edge portion 3R (bonding margin) of the lid portion 3 shown by hatching in FIG. 1 as described above. A peripheral edge portion (hereinafter, also referred to as “lid peripheral edge portion”) 3R of the lid portion 3 is set to have the notch 33 as an outer peripheral edge and a position slightly on the inner peripheral side of the notch 34 as an inner peripheral edge in a plan view. ..

The peeling layer 15 has lower adhesiveness (affinity) to the adhesive layer 13 than the outer layer 12 and can be easily peeled from the adhesive layer 13, while the peeling layer 15 does not cause the picking portion 32 by hand. Adhesiveness to such an extent that the adhesion with is stably maintained. That is, by providing the peeling layer 15, the lid portion 3 can be re-adhered (re-sealed) and re-peeled (re-sealed) to the adhesive layer 13.

Specific examples of the release agent that forms the release layer 15 include silicon and varnish.
The adhesiveness of the release layer 15 itself can be adjusted by changing the type of release agent. Alternatively, the release layer 15 may be formed by applying a release agent in a dot shape instead of solid coating, and adjusting by changing the number of dots per unit area (that is, the release agent application area per unit area). ..
The release agent is selected so that it has a high affinity for the outer layer 12 so as to be fixed to the outer layer 12.

The grip portion 32 is preferably a flap-shaped one so that it can be gripped with a finger. For this reason, the peeling layer 15 provided on the picking portion 32 has lower adhesiveness to the adhesive layer 13 (ideally, there is no sticking ability) than the peeling layer 15 provided on other than the picking portion 32. It is preferable to use a pressure-sensitive adhesive having a lower adhesiveness to the pressure-sensitive adhesive layer 13 or to increase the coating area of the release agent per unit area.

With such a configuration, as shown by the chain double-dashed line in FIG. 1, the grip portion 23 is gripped by a finger and the lid portion 3 is raised, so that the lid portion 3 is separated from the top surface 2 excluding the base portion 31. The packaging bag 1 can be opened (the packaging bag 1 can be opened), and after opening, the packaging bag 1 can be repeatedly resealed and reopened.
That is, when the lid 3 is to be raised from the sealed state of the packaging bag 1 shown in FIG. 2B, the peeling layer 15 of the lid peripheral portion 3R starts peeling from the adhesive layer 13 and is provided on the inner layer 14. A crack 35 is formed between the cut 34 and the peeling layer 15 as shown by a chain double-dashed line. As a result, the notch 33 provided in the outer layer 12, the boundary surface between the peeling layer 15 and the adhesive layer 13, the crack 35, and the notch 34 provided in the inner layer 14 form a continuous fracture surface, and the lid portion 3 causes the base portion 31 ( It is trimmed from the top surface 2 except for (see FIG. 1). As a result, as shown in FIG. 2C, the lid portion 3 can be raised from the top surface 2 and opened. Further, at this time, the adhesive layer 13 is exposed at the peripheral edge of the outlet 20 of the top surface 2 from which the lid portion 3 is separated.
After opening, if the lid 3 is lowered so as to close the outlet 20, the peeling layer 15 of the lid 3 is re-bonded to the adhesive layer 13 exposed at the periphery of the outlet 20, and the packaging bag 1 is resealed. .. After that, if the lid portion 3 is raised, the peeling layer 15 of the lid portion 3 can be peeled from the adhesive layer 13 on the periphery of the ejection port 20 and can be resealed.

The crack 35 shown by the chain double-dashed line in FIG. 2B is an example, and does not necessarily have the shape as illustrated.

[3. Production method]
With reference to FIG. 3, the manufacturing method of the packaging bag 1 will be described focusing on the manufacturing method of the laminated sheet 10.
FIG. 3 is a schematic diagram showing a main configuration of a manufacturing apparatus for the packaging bag 1 according to the embodiment of the present invention. Note that, in FIG. 3, for convenience, each layer forming the laminated sheet 10 is shown thicker.

As shown in FIG. 3, the main body layer 121 of the base material layer (outer layer) 12 is sent out from the supply roll 40, and the back surface (lower surface in FIG. 3) of the main body layer 121 is printed by the printing device 41 ( After forming the base material layer 12 (forming the print layer 122), a U-shape for forming the lid portion 3 is formed on the base material layer 12 by the cutting device 42 (for example, a laser or a cutting roll). The notch 33 (see FIG. 1, omitted in FIG. 3) is processed. After that, a release agent is applied to the inner peripheral side of the notch 33 in a square ring shape by the coating device 43 (for example, a coating roll having a coating pattern formed on the surface) to form the release layer 15 (release layer forming step).

On the other hand, the supply roll 50 sends out the seal layer (inner layer) 14 in which the gas barrier layer 141 is vapor-deposited on the fusion layer 142, and the seal layer 14 is covered by the cutting device 51 (for example, a laser or a cutting roll). A square ring-shaped cut 34 (see FIG. 1 and omitted in FIG. 3) for forming is formed into a fusion bonding layer 142 while leaving the gas barrier layer 141. The seal layer 14 processed with the cuts 34 is supplied to a coating device 52 (for example, a coating roll), and a pressure sensitive adhesive is coated on the gas barrier layer 141 by the coating device 52 to form the pressure sensitive adhesive layer 13 (formation of the pressure sensitive adhesive layer). Step). The adhesive layer 13 is formed with a uniform thickness over the entire surface of the seal layer 14 without being formed in a specific pattern.

After that, the base material layer 12 having the release layer 15 formed on the back surface by the coating device 43 is fed to the nip portion of the pair of pressing rolls 60 and 61, and the seal having the adhesive layer 13 formed on the surface by the coating device 52. The layer 14 is similarly fed to the nip portion of the pressing rolls 60 and 61 via the guide roll 53. As a result, the base material layer 12 and the seal layer 14 are pressed by the pressing rolls 60 and 61, and are integrated with each other via the adhesive layer 13 and the peeling layer 15 (integration step), and the laminated sheet 10 is completed.

Then, the laminated sheet 10 is cut to an appropriate length, then bent into a tubular shape and the end portions are heat-sealed to form a bag, thereby completing the production of the packaging bag 1.

The cuts 33 and 34 may be processed after the base material layer 12 and the seal layer 14 are bonded together.

Here, as described above, the adhesive layer 13 is formed with a uniform thickness over the entire surface of the seal layer 14, but when the laminated sheet 10 is completed as shown in FIG. The layer 13 has a recessed shape corresponding to the shape of the peeling layer 15. This is a result of deformation of the adhesive layer 13 according to the shape of the peeling layer 15 when the base material layer 12 and the seal layer 14 are bonded together. That is, complicated molding such as changing the thickness of the adhesive layer 13 between a portion facing the peeling layer 15 and another portion is unnecessary.

[4. effect]
The effect of one embodiment of the present invention will be described with reference to FIGS.
In one embodiment of the present invention, the peeling layer 15 having low adhesiveness to the adhesive layer 13 is provided in the peripheral edge portion 3R of the lid portion 3 facing the adhesive layer 13 of the top surface 2, that is, in the adhesive margin to the upper surface 2. There is. As a result, the lid 3 can be peeled from the adhesive layer 13 to open the packaging bag 1 (including reopening after resealing), and the lid 3 can be simply pushed back to the top surface 2 to remove the peeling layer 15. Can be adhered to the adhesive layer 13 to reseal the packaging bag 1.
In addition, by the cooperative action of the adhesive layer 13 and the peeling layer 15, the degree of adhesion between the laminated adhesive layer 13 and the peeling layer 15 is adjusted, and the peeling of the lid portion 3 from the top surface 2 is performed. (Opening and reopening) and re-adhesion (resealing) can be repeated. That is, it is premised that the adhesive layer 13 and the peeling layer 15 are overlapped. For this reason, it is not necessary to form the adhesive layer 13 in a pattern so as to avoid the peeling layer 15, and regardless of the shape of the peeling layer 15, the adhesive layer 13 may be provided uniformly over the entire surface of the inner layer 14. Therefore, the adhesive layer 13 can be easily formed.
Therefore, according to one embodiment of the present invention, the resealable packaging bag 1 can be easily manufactured.

In particular, when the release layer 15 is composed of a plurality of halftone dot release agents and the halftone dot pattern (the number of halftone dots per unit area or the arrangement) is changed to adjust the adherence of the release layer 15, Even if the halftone dot pattern of the layer 15 is changed, it is not necessary to change the mode of forming the adhesive layer 13, which is more effective.

The outer layer 12 and the inner layer 14 are adhered by the adhesive layer 13 (adhesive) not only at the place where the lid 3 is provided but also at other places. Since the pressure-sensitive adhesive generally does not contain a solvent, safety can be ensured as compared with the case where the outer layer 12 and the inner layer 14 are bonded by an adhesive containing a solvent.

Further, the gas barrier layer 141 is provided on the surface of the inner layer 14 facing the adhesive layer 13, and the notch 34 formed from the back surface side of the inner layer 14 is formed leaving the gas barrier layer 141. Therefore, since the packaging bag 1 is sealed by the gas barrier layer 141 in the unopened state, it is possible to prevent the stored items from being oxidized.

When the peeling layer 15 is provided so as to extend to the outer peripheral side of the notch 33, the outer layer 12 peels off at the outer peripheral side of the notch 33, that is, at the edge of the outlet 20, and the peeling of the outer layer 12 gradually starts from this peeling. There is a risk that it will progress to. On the other hand, if the peeling layer 15 is provided on the inner peripheral side of the notch 33 largely, the outer layer 12 directly adheres strongly to the adhesive 13 at the outer edge of the lid 3, so that the lid 3 can be smoothly agitated. It may disappear.
Further, when the peeling layer 15 is provided on the outer peripheral side farther than the notch 34, the peeling layer 15 existing on the outer peripheral edge of the lid portion 3 decreases, so that the outer layer 12 of the lid portion 3 and the inner layer of the top surface 2 are reduced. There is a fear that the cap 3 and the cap 14 will be strongly adhered to each other via the adhesive layer 13 and the lid 3 will not be smoothly caused. Further, when the inner peripheral edge of the peeling layer 15 is designed so as to coincide with the notch 34, the inner peripheral edge of the peeling layer 15 may be displaced toward the outer peripheral side of the notch 34 due to a manufacturing error.
On the other hand, in the present embodiment, the lid peripheral edge portion 3R indicated by hatching in FIG. Since the margin is set, such a problem can be prevented. As long as the lid portion 3 can be smoothly adhered to and peeled from the top surface 20 of the packaging bag 1, at least a part of the peeling layer 15 may be located between the notches 33 and 34. The installation range of is not limited to the lid peripheral portion 3R shown in FIG.

[5. Other]
(1) In the above-described embodiment, the inner layer 14 is configured to include the gas barrier layer 141. However, the stored item has a problem due to contact with the outside air, such as a product that is not likely to be oxidized (for example, baked confectionery that does not contain oil). The gas barrier layer 141 may be omitted from the inner layer 14 as long as the above does not occur.

(2) In the above embodiment, the entire packaging bag 1 is composed of the laminated sheet 10, but at least the top surface 2 on which the lid portion 3 is provided may be composed of the laminated sheet 10, and other than the top surface 2. The part may be made of a material different from that of the laminated sheet 10.

(3) In the above embodiment, the print layer 122 is provided on the outer layer 12, but the print layer 122 is not essential.

(4) In the above embodiment, the stored item is a confectionery product, but the type of the stored item is not limited at all, and household miscellaneous goods such as a wet tissue may be used as the stored item.

DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Top surface of the packaging bag 20 Ejection opening of the top surface 2 3 Lid part 31 Base end 33 of the lid part 3 Notch (1st notch)
34 notches (second notches)
Laminated sheet 12 outer layer to form the peripheral portion 10 packaging bag 1 of the 3R lid 3 (base layer)
121 Main layer 122 Printing layer 13 Adhesive layer 14 Inner layer (seal layer)
141 Gas Barrier Layer 142 Fusion Layer 15 Release Layer 40,50 Supply Roll 41 Printing Device 42,52 Cutting Device 43 Coating Device 53 Guide Roll

Claims (4)

At least the top surface is composed of a flexible laminated sheet, the top surface is provided with a lid, in a packaging bag,
The laminated sheet includes a base material layer facing outward, a seal layer facing inward, and an adhesive layer provided between the base material layer and the seal layer,
The lid is
While being defined by a first notch provided in the base layer and a second notch provided in the seal layer on the inner peripheral side of the first notch,
On the surface of the base material layer facing the adhesive layer, the base material is provided between the first cut and the second cut and in the peripheral portion of the lid portion, and the adhesiveness to the adhesive layer is the base material. A packaging bag comprising a release layer lower than the layer but capable of readhesion . The seal layer has a gas barrier layer laminated on a surface facing the adhesive layer,
The packaging bag according to claim 1, wherein the second cut is provided only in the sealing layer, leaving the gas barrier layer. A laminated sheet that constitutes at least the top surface of a packaging bag provided with a lid portion on the top surface,
A base material layer,
A sealing layer,
An adhesive layer provided between the base material layer and the seal layer,
A first notch provided in the base layer to define the lid portion;
A second notch that is provided on the inner peripheral side of the first notch in the seal layer and that defines the lid portion together with the first notch;
On the surface of the base material layer facing the adhesive layer, the base material is provided between the first cut and the second cut and in the peripheral portion of the lid portion, and the adhesiveness to the adhesive layer is the base material. A laminated sheet comprising a release layer lower than the layer but capable of readhesion . A method for manufacturing a laminated sheet constituting at least the top surface of a packaging bag provided with a lid on the top surface,
Forming an adhesive layer with a constant thickness on the seal layer, an adhesive layer forming step,
In the peripheral portion of the base material layer where the lid portion is provided, a release layer is formed, which has a lower adhesiveness to the adhesive layer than the base material layer but can be re- adhered, a release layer forming step,
A method for manufacturing a laminated sheet, comprising: an integration step of adhering the base material layer and the seal layer so that the adhesive layer and the release layer face each other.

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