JP2018030608A - Packaging bag, laminated sheet and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag of which manufacture can be simplified, and a method for manufacturing a laminated sheet which constitutes the packaging bag.SOLUTION: A packaging bag of which at least a top surface 2 is configured from a flexible laminated sheet 10 and the top surface 2 is provided with a lid part 3, in which the laminated sheet 10 comprises a base material layer 12 which is directed outward, a seal layer 14 which is directed inward, and an adhesive layer 13 which is provided between the base material layer 12 and the seal layer 14. The lid part 3 comprises: a first cut 33 which is provided on the base material layer 12; a second cut 34 which is provided on the seal layer 14 on an inner peripheral side of the first cut 33; and a release layer 15 which is provided between the first cut 33 and the second cut 34 on a face which is defined by the first cut and the second cut and is directed to the adhesive layer 13 of the base material layer 12, and of which non-adhesiveness to the adhesive layer 13 is lower than the base material layer 12.SELECTED DRAWING: Figure 2

Description

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

  Many of the products are distributed in the market while being stored in packaging bags. For example, in a packaging bag used for food such as confectionery products, after opening, after removing a part of the food, it can be resealed to ensure airtightness and prevent dust from entering inside. (See, for example, 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 views showing the configuration of a resealable packaging container disclosed in Patent Document 1, wherein FIG. 4A is an overall perspective view of the packaging container, and FIG. 4B is an opened state in a sealed (resealed) state. It is sectional drawing of the periphery of a part, (a) A1-A1 sectional drawing, (c) is a sectional view of the opening part periphery in an opening (reopening sealing) state, (a) A2-A2 sectional drawing.

  As shown to Fig.4 (a), the packaging container 01 is comprised by providing the opening part 02 in the top | upper surface (upper surface) of the enclosure 01A which wraps the contents. The opening part 02 is formed by providing U-shaped cuts 011a and 012a, which will be described later, on the top surface (upper surface).

The surrounding body 01A is formed by molding the constituent material 010 into a bag shape. As shown in FIGS. 4B and 4C, the constituent material 010 is formed by laminating the outer constituent material 011 and the inner constituent material 012 and is permanently bonded (that is, cannot be peeled off) by the laminating adhesive 03. Configured. The opening portion 02 is provided with the U-shaped notch 011a in the outer constituent material 011 and the laminating adhesive 03, and the U-shaped notch 012a is disposed on the inner side of the notch 011a on the U-shaped inner peripheral side. It is comprised by providing in the structural material 012.
Between the notches 011a and 012a defining the opening portion 02, that is, a U-shaped peripheral region (hereinafter also referred to as “opening peripheral region”) 02a of the opening portion 02 is an enclosure body 01A ′ (from the enclosure 01A). The pressure-sensitive adhesive 04 is applied instead of the laminating adhesive 03. Since the pressure-sensitive adhesive 04 has a constant stickiness, the opening-periphery peripheral area 02a is bonded to the envelope body 01A 'by the pressure-sensitive adhesive 04 so as to be peelable and re-adherable. Thereby, resealing after opening of the packaging container 01 is possible.

Specifically, in the closed state of the opening portion 02 indicated by a solid line in FIG. 4A, as shown in FIG. 4B, the pressure-sensitive adhesive 04 on the lower surface of the opening portion peripheral region 02a is The packaging container 01 is sealed (resealed) by adhering to the inner constituent material 012 of the main body 01A ′.
On the other hand, in the closed state of the opening part 02 shown by the two-dot chain line in FIG. 4A, as shown in FIG. 4C, the pressure-sensitive adhesive 04 on the lower surface of the opening part peripheral region 02a is Peel from the inner constituent material 012 of 01A ′.

Special table 2008-502555 gazette

In the packaging container 01 disclosed in Patent Document 1, the pressure-sensitive adhesive 04 is applied to the U-shaped opening portion peripheral area 02a, and the laminating adhesive 03 is applied to the other areas.
When the laminating adhesive 03 enters the unsealed peripheral area 02a and covers the pressure-sensitive adhesive 04, the unsealed peripheral area 02a and the envelope body 01A 'are permanently (substantially) In other words, the unsealed portion 02 cannot be unsealed.
On the other hand, if a gap is generated between the laminating adhesive 03 and the pressure-sensitive adhesive 04, both the adhesives 03 and 04 are not present in the gap, and the outer component material 011 and the inner component material are removed. As a result, the outer constituent material 011 and the inner constituent material 012 are unnecessarily peeled off.
Therefore, each of the laminating adhesive 03 and the pressure sensitive adhesive 04 is made 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 no gap is formed between both areas. It must be applied accurately in a predetermined pattern, and high manufacturing accuracy is required.

  The present invention has been conceived in view of the above-described problems, and an object thereof is to provide a packaging bag capable of simplifying production and a method for producing a laminated sheet constituting the packaging bag.

  (1) In order to achieve the above object, the packaging bag of the present invention is a packaging bag in which at least the top surface is constituted by a flexible laminated sheet, and the top surface is provided with a lid. 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. And a surface facing the adhesive layer of the base material layer, as defined by a first cut provided in the first cut and a second cut provided in the seal layer on an inner peripheral side of the first cut In the above, a release layer is provided between the first cut and the second cut and has a release layer having lower adhesion to the adhesive layer than the base 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 leaving the gas barrier layer.

  (3) In order to achieve the above object, the laminated sheet of the present invention is a laminated sheet constituting at least the top surface of the packaging bag provided with a lid on the top surface, and a base material layer; A sealing layer, an adhesive layer provided between the base material layer and the sealing layer, a first cut provided on the base material layer to define the lid, and the first in the sealing layer. A second notch that is provided on the inner peripheral side of the first notch and that defines the lid together with the first notch; and the surface of the base material layer that faces the adhesive layer, the first notch and the It is provided between the second cut and a release layer having a lower adherence to the adhesive layer than the base material layer.

  (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 constituting at least the top surface of a packaging bag provided with a lid on the top surface. The adhesive layer is formed on the sealing layer with a certain thickness, and the adhesive layer forming step has a higher adhesion to the adhesive layer than the base material layer at the peripheral portion of the base layer where the lid portion is formed. It is characterized by comprising a release layer forming step of providing a low release layer, and an integration step of bonding the base layer and the seal layer with the adhesive layer and the release layer facing each other.

According to this invention, the peeling layer with low adhesiveness with respect to an adhesion layer is provided between the 1st notch used as the adhesion allowance of the cover part with respect to the top | upper surface of a packaging bag, and a 2nd notch. As a result, the lid can be peeled off from the adhesive layer, and the packaging bag can be opened / reopened, and the packaging layer can be re-sealed by sticking the peeling layer to the adhesive layer by simply pushing the lid back to the top. be able to.
In addition, the degree of adhesion between the adhesive layer and the release layer is adjusted so that peeling (opening and re-sealing) and re-adhesion (resealing) from the top of the lid can be repeated. Since it is assumed that the layer and the release layer are superposed, 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, a resealable packaging bag can be easily manufactured.

It is a perspective view which shows the whole structure of the packaging bag of one Embodiment of this invention. It is a schematic diagram for demonstrating the structure of the cover part and laminated sheet which concern on one Embodiment of this invention, Comprising: (a) is B1-B1 sectional drawing of FIG. 1, (b) is B2-B2 sectional drawing of FIG. It is a figure which shows the state which the cover part closed, (c) is B3-B3 sectional drawing of FIG. 1, and is a figure which shows the state which the cover part 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, Comprising: (a) is a whole perspective view of a packaging container, (b) is the cross section of the opening part periphery in a sealing (resealing) state It is a figure, A1-A1 sectional drawing of (a), (c) is sectional drawing of the opening part periphery in an opening (reopening sealing) state, Comprising: It is A2-A2 sectional drawing of (a).

Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiment described below is merely an example, and there is no intention to exclude various modifications and technical applications that are not explicitly described in the following embodiment. The configurations of the following embodiments can be implemented with various modifications without departing from the spirit thereof.
In the following description, the upper and lower sides are defined based on the state in which the lid portion is directed 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”. "
In addition, the inner space side of the packaging bag is described as “inside” or “inside”, and the opposite side is described as “outside” or “outside”.
A direction approaching the center CP (intersection of the center line in the length direction L and the center line in the width direction W) of the lid is referred to as “inner side”, and the side away from the center CP is referred to as “outer side”. "Side" will be described.

[1. Overall structure of packaging bag]
The whole structure of the packaging bag of one Embodiment of this invention is demonstrated with reference to FIG.
FIG. 1 is a perspective view showing the overall configuration of the packaging bag of the present embodiment.
The packaging bag 1 includes a lid portion 3 provided on the top surface (upper surface) 2 so as to be resealable.
The packaging bag 1 bends one flexible laminated sheet 10 (the laminated sheet 10 will be described later) into a cylindrical shape, overlaps the ends thereof, and heat-bonds these overlapped ends, for example. It is a bag shape. In this embodiment, the seal part 11a along the length direction L and the seal parts 11b and 11c along the width direction W are formed as the heat fusion part. In addition, although the seal part 11a has shown only a part of both ends for convenience, it is formed over the full length of the packaging bag 1. FIG.
The lid 3 is formed at the center of the top surface 2 of the packaging bag 1 and is separated from the bag body (the portion obtained by removing the lid 3 from the packaging bag 1) except for one end (base end) 31 in the longitudinal direction L. It is possible. A semicircular knob 32 is provided at the other end (tip) of the lid 3 in the longitudinal direction L. The knob 32 is held and lifted as indicated by a two-dot chain line in FIG. Thus, an opening 20 along the longitudinal direction L appears at the center of the top surface 2. Articles stored in the packaging bag 1 (for example, confectionery products such as potato chips, biscuits, cookies) can be taken out from the opening 20. Therefore, the opening 20 is hereinafter referred to as “take-out port”.

[2. Configuration of laminated sheet and lid]
The configuration of the laminated sheet 10 and the lid 3 will be described with reference to FIG. 2 in addition to FIG.
2A and 2B are schematic views for explaining the configuration of the lid portion 3 and the laminated sheet 10 according to an embodiment of the present invention, in which FIG. 2A is a cross-sectional view along B1-B1 in FIG. 1, and FIG. 1 is a cross-sectional view taken along the line B2-B2 of FIG. 1 and shows a state in which the lid portion 3 is closed; FIG. 3C is a cross-sectional view of the cross-section B3-B3 of FIG. In addition, in FIG. 2, each layer which comprises the lamination sheet 10 and the lamination sheet 10 is shown thickly for convenience.

  As shown in FIGS. 2A, 2 </ b> B, and 2 </ b> C, the laminated sheet 10 includes a flexible base layer 12, a flexible seal layer 14, a base layer 12, and an inner layer 14. And an adhesive layer 13 interposed therebetween and a release 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 directed outward when the packaging bag 1 is formed (the “base material layer 12” is hereinafter also referred to as “outer layer 12”). The outer layer 12 includes a main layer 121 that forms the outermost surface of the packaging bag 1 and a printed layer 122 that is laminated on the main layer 121 on the adhesive layer 13 side.
The main layer 121 is preferably formed of a printable flexible material and is excellent in puncture strength, tensile strength, impact resistance, and the like. In the present embodiment, the main layer 121 is formed using PET (polyethylene terephthalate). However, any flexible material that can be printed can be used. Specifically, as a material that can be used for the main layer 121 other than PET, for example, nylon, OPP (stretched 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 layer 121 (in other words, a layer formed by ink).

The pressure-sensitive adhesive layer 13 is composed of a pressure-sensitive adhesive (generally also called a pressure-sensitive adhesive), and adheres the outer layer 12 and the inner layer 14. The pressure-sensitive adhesive used in the present invention is attached to the outer layer 12 and the inner layer 14. It has strong adhesiveness. Here, the strong adhesiveness refers to adhesive strength adhesiveness that cannot peel the outer layer 12 and the inner layer 14 without damage. As the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 13, a material having strong adhesiveness is appropriately selected under the environmental conditions (temperature range, humidity range, etc.) in which the packaging bag 1 is used.
In the present embodiment, a hot melt adhesive is used as the adhesive that forms the adhesive layer 13. As the hot-melt adhesive, ethylene vinyl acetate, polyolefin, polyamide, polyurethane, synthetic rubber, and acrylic are used. Of these, synthetic rubbers and acrylics are preferably used.
Moreover, as the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 13, a pressure-sensitive adhesive other than the hot melt pressure-sensitive adhesive can be used.

The seal layer 14 is a layer directed inward (inside the inner space) when the packaging bag 1 is formed (the “seal layer 14” is hereinafter also referred to as “inner layer 14”). The inner layer 14 includes a fusion layer 142 that forms the innermost surface of the packaging bag 1 and is a main layer of the inner layer 14, and a gas barrier layer 141 that is laminated on the adhesion layer 13 side of the fusion layer 142.
In the present embodiment, an aluminum vapor deposition layer deposited on the fusion 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 bonding an aluminum foil to the fusion 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 made of aluminum oxide or silicon oxide can be provided to form the gas barrier layer 141.

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

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

The release layer 15 is provided on the rear surface (inner surface) of the lid 3 at the peripheral edge 3R (that is, the bonding margin of the lid 3 with respect to the top surface 2) indicated by hatching in FIG.
Here, the configuration of the lid 3 will be described. As shown in FIG. 1, the lid 3 is formed by making a cut (first cut) 33 on the front surface (outer surface) of the top surface 2 and a cut (second cut) 34 on the back surface (inner surface). The The notch 33 is U-shaped, and the notch 34 is a rectangular ring formed along the notch 33 with an interval on the inner peripheral side (center CP side) of the notch 33. The cut 34 may be U-shaped in the same manner as the cut 33.
FIG. 2B shows a state before opening (before the lid 3 is opened). As shown in FIG. 2B, the cut 33 is formed through 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 the gas barrier property from deteriorating. This prevents the oil from touching the outside air and oxidizing when the stored product contains oil such as potato chips. it can. In the present embodiment, the gas barrier layer 141 is not cut at the time of manufacturing the packaging bag 1 by forming the cut 34 while leaving a part of the fusion layer 142 on the gas barrier layer 141 side ( We have a margin in production).

The notches in the present invention include both continuous cutting lines and perforations formed by intermittent cutting portions. In the present embodiment, although indicated by a solid line or a broken line in FIG. 1, the cuts 33 and 34 are perforated except for the cut 33 b that defines the knob 32. The incision 33b that defines the knob 32 is continuously cut so that it can be easily picked with a finger. However, the sewing machine is rough enough that it can be easily cut with a finger (the interval between the cutting parts is short). You may make it define with eyes.
Further, in the present embodiment, the notches 33 and 34 are accommodated by providing appropriate intervals in the longitudinal direction L and leaving uncut portions 33a and 34a at the same position (or substantially the same position) with respect to the longitudinal direction L. The opening range of the lid 3 can be expanded step by step according to the use of the product.
It should be noted that only one of the uncut portion 33a and the uncut portion 34a may be provided.

  And the peeling layer 15 is provided in the peripheral part 3R (adhesion allowance) of the cover part 3 shown by the oblique line in FIG. 1 between the outer layer 12 and the adhesion layer 13 as above-mentioned. The peripheral portion (hereinafter also referred to as “lid peripheral portion”) 3R of the lid portion 3 is set with the notch 33 as an outer peripheral edge and a position slightly on the inner peripheral side from the notch 34 as an inner peripheral edge in plan view. .

  The release layer 15 has a lower adherence (affinity) to the adhesive layer 13 than the outer layer 12 and can be easily peeled off from the adhesive layer 13. It has a tack-adhesiveness to such an extent that the adhesion with is stably maintained. That is, by providing the release layer 15, the lid 3 can be re-adhered (resealed) and re-detached (reopened) with respect to the adhesive layer 13.

Specific examples of the release agent for forming the release layer 15 include silicon and varnish.
In addition, the adhesiveness of peeling layer 15 itself can be adjusted by changing the kind of peeling agent. Alternatively, the release layer 15 can be adjusted by forming the release agent in a halftone dot form instead of solid coating and changing the number of halftone dots per unit area (that is, the application area of the release agent per unit area). .
A release agent having a high affinity for the outer layer 12 is selected so as to be fixed to the outer layer 12.

  About the knob | pick part 32, a flap-shaped thing is preferable so that it can hold with a finger | toe. For this reason, the peeling layer 15 provided in the knob part 32 has lower adhesion to the adhesive layer 13 than the peeling layer 15 provided other than the knob part 32 (ideally there is no adhesion). It is preferable to use a pressure-sensitive adhesive having lower adhesion to the pressure-sensitive adhesive layer 13 or to increase the application area of the release agent per unit area.

With such a configuration, as shown by a two-dot chain line in FIG. 1, the lid portion 3 is separated from the top surface 2 by removing the base portion 31 by holding the knob portion 23 with a finger to cause the lid portion 3. (The packaging bag 1 can be opened), and after opening, the packaging bag 1 can be resealed and re-sealed repeatedly.
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 edge 3R starts to peel from the adhesive layer 13 and is provided on the inner layer 14. A crack 35 is generated between the cut 34 and the release layer 15 as indicated by a two-dot chain line. Thereby, the notch 33 provided in the outer layer 12, the boundary surface between the release 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 3 is formed on the base 31 ( The edge is cut off from the top surface 2 except for FIG. As a result, as shown in FIG. 2C, the lid 3 can be opened from the top surface 2. At this time, the adhesive layer 13 is exposed at the periphery of the outlet 20 of the top surface 2 from which the lid portion 3 is separated.
If the lid 3 is lowered so as to close the outlet 20 after opening, the release layer 15 of the lid 3 is re-adhered to the adhesive layer 13 exposed at the periphery of the outlet 20, and the packaging bag 1 is resealed. . Thereafter, when the lid 3 is raised, the peeling layer 15 of the lid 3 is peeled off from the adhesive layer 13 on the periphery of the outlet 20 and can be sealed again.

  In addition, the crack 35 shown with a dashed-two dotted line in FIG.2 (b) is an example, and does not necessarily become a shape as shown in figure.

[3. Production method]
With reference to FIG. 3, the manufacturing method of the packaging bag 1 is demonstrated centering on the manufacturing method of the lamination sheet 10. FIG.
FIG. 3 is a schematic diagram showing the main configuration of the manufacturing apparatus for the packaging bag 1 according to one embodiment of the present invention. In addition, in FIG. 3, each layer which comprises the lamination sheet 10 is shown thickly for convenience.

  As shown in FIG. 3, the main layer 121 of the base material layer (outer layer) 12 is sent out from the supply roll 40, and printing is performed on the back surface (lower surface in FIG. 3) by the printing device 41 ( After forming the base material layer 12 (by forming the printing layer 122), the base material layer 12 is formed into a U-shape for forming the lid 3 by a cutting device 42 (for example, a laser or a cutting roll). Cuts 33 (see FIG. 1, omitted in FIG. 3) are processed. Thereafter, a release agent 15 is applied to the inner peripheral side of the cut 33 by an application device 43 (for example, an application roll having an application pattern formed on the surface) to form the release layer 15 (release layer forming step).

  On the other hand, a sealing layer (inner layer) 14 in which a gas barrier layer 141 is deposited on the fusion layer 142 is sent out from the supply roll 50, and this sealing layer 14 is covered with the lid 3 by a cutting device 51 (for example, a laser or a cutting roll). An annular cut 34 (see FIG. 1, omitted in FIG. 3) for forming the film is processed into a fusion layer 142 leaving the gas barrier layer 141. The sealing 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 a pressure-sensitive adhesive layer 13 (adhesive layer formation). Step). The adhesive layer 13 is formed with a uniform thickness over the entire surface of the sealing layer 14 without being formed in a specific pattern.

  Thereafter, 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 through the guide roll 53. Thereby, it presses with the pressing rolls 60 and 61, the base material layer 12 and the sealing layer 14 are integrated via the adhesion layer 13 and the peeling layer 15 (integration step), and the lamination sheet 10 is completed.

  Then, after the laminated sheet 10 is cut into an appropriate length, it is bent into a cylindrical shape, and the end portion is heat-sealed to form a bag shape, whereby the production of the packaging bag 1 is completed.

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

  Here, as described above, the pressure-sensitive adhesive layer 13 is formed with a uniform thickness over the entire surface of the seal layer 14, but in the state completed as the laminated sheet 10 as shown in FIG. The layer 13 has a concave shape in accordance with the shape of the release layer 15. This is a result of deformation of the adhesive layer 13 according to the shape of the release layer 15 when the base material layer 12 and the seal layer 14 are bonded. That is, complicated molding that changes the thickness of the pressure-sensitive adhesive layer 13 between the part facing the peeling layer 15 and another part is unnecessary.

[4. effect]
With reference to FIGS. 1-3, the effect of one Embodiment of this invention is demonstrated.
In one embodiment of the present invention, a release layer 15 having low adhesion to the adhesive layer 13 is provided for the margin of the peripheral portion 3R of the lid 3 facing the adhesive layer 13 on the top surface 2, that is, the bonding allowance to the top surface 2. Yes. As a result, the lid 3 can be peeled off from the adhesive layer 13 to open the packaging bag 1 (including re-sealing after resealing), and the peeling layer 15 can be simply pushed back to the top surface 2. Can be adhered to the adhesive layer 13 and the packaging bag 1 can be resealed.
Further, the cohesive action of the adhesive layer 13 and the release layer 15 adjusts the degree of adhesion between the adhesive layer 13 and the release layer 15 to be overlapped, so that the lid 3 is peeled from the top surface 2. (Opening and re-sealing) and re-adhesion (resealing) can be repeated. That is, it is assumed that the adhesive layer 13 and the release 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 release layer 15, and it is only necessary to provide the adhesive layer 13 uniformly over the entire surface of the inner layer 14 regardless of the shape of the release layer 15. Therefore, formation of the adhesion layer 13 can be performed easily.
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 dot-like release agents and the dot pattern (number of dots or arrangement per unit area) is changed to adjust the adherence of the release layer 15, the release layer 15 is peeled off. 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 bonded not only to the portion where the lid 3 is provided, but also to other portions by the adhesive layer 13 (adhesive). 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 with 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 cut 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 an unopened state, it is possible to prevent the stored product from being oxidized.

When the release layer 15 is provided so as to protrude greatly to the outer peripheral side of the notch 33, the outer layer 12 is peeled off at the outer peripheral side of the cut 33, that is, at the edge of the outlet 20. There is a risk of progressing. On the other hand, if the release layer 15 is provided far from the notch 33 on the inner peripheral side, the outer layer 12 directly adheres directly to the adhesive 13 at the outer edge of the lid 3, so that the lid 3 can be caused smoothly. There is a risk of disappearing.
Further, if the release layer 15 is provided so as to be largely distant from the notch 34 on the outer peripheral side, the release layer 15 existing on the outer peripheral edge of the lid portion 3 is reduced, so the outer layer 12 of the lid portion 3 and the inner layer of the top surface 2 14 may strongly adhere to the adhesive layer 13 through the pressure-sensitive adhesive layer 13 and the lid portion 3 may not be caused smoothly. Further, when the inner peripheral edge of the release layer 15 is designed so as to coincide with the notch 34, the inner peripheral edge of the release layer 15 may be displaced to the outer peripheral side from 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. 1, which is the installation range of the release layer 15, has the notch 33 as the outer peripheral edge and is positioned slightly on the inner peripheral side from the notch 34. Since it is set as the peripheral edge, such a problem can be prevented. If the lid 3 can be smoothly bonded and peeled from the top surface 20 of the packaging bag 1, at least a part of the peeling layer 15 may be positioned between the cuts 33 and 34, and the peeling layer 15 The installation range is not limited to the lid peripheral edge 3R shown in FIG.

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

  (2) In the above embodiment, the entire packaging bag 1 is configured by the laminated sheet 10. However, at least the top surface 2 on which the lid portion 3 is provided may be configured by the laminated sheet 10. These parts 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 for example, a household item such as a wet tissue may be used as the stored item.

DESCRIPTION OF SYMBOLS 1 Packing bag 2 Top surface of packaging bag 1 20 Outlet of top surface 2 3 Lid part 31 Base end of lid part 33 Cut (1st cut)
34 notch (second notch)
3R Peripheral part 10 of the lid part 10 Laminated sheet 10 forming the packaging bag 1
12 Outer layer (base material layer)
121 Main layer 122 Print layer 13 Adhesive layer 14 Inner layer (seal layer)
141 Gas barrier layer 142 Fusion layer 15 Peeling layer 40, 50 Supply roll 41 Printing device 42, 52 Cutting device 43 Coating device 53 Guide roll

Claims (4)

In the packaging bag, at least the top surface is composed of a flexible laminated sheet, and the top surface is provided with a lid,
The laminated sheet comprises a base layer facing outward, a seal layer facing inward, and an adhesive layer provided between the base layer and the seal layer,
The lid is
The first notch provided in the base material layer and the second notch provided in the seal layer on the inner peripheral side of the first notch are defined,
On the surface of the base material layer facing the adhesive layer, a release layer provided between the first cut and the second cut and having a lower adhesion to the adhesive layer than the base material layer. A packaging bag characterized by comprising. The sealing layer has a gas barrier layer laminated on the surface facing the adhesive layer,
The packaging bag according to claim 1, wherein the second cut is provided only in the seal layer leaving the gas barrier layer. A laminated sheet constituting at least the top surface of the packaging bag provided with a lid on the top surface,
A base material layer;
A sealing layer;
An adhesive layer provided between the base material layer and the sealing layer;
A first cut provided in the base material layer to define the lid;
A second notch provided on the inner peripheral side of the first notch in the seal layer and defining the lid part together with the first notch;
On the surface of the base material layer facing the adhesive layer, a release layer provided between the first cut and the second cut and having a lower adhesion to the adhesive layer than the base material layer. A laminated sheet comprising the laminated sheet. A method for producing a laminated sheet constituting at least the top surface of the packaging bag provided with a lid on the top surface,
An adhesive layer forming step of forming an adhesive layer with a constant thickness on the seal layer;
A release layer forming step, in which a release layer having a lower adhesion to the adhesive layer than the base material layer is provided at a peripheral portion of the portion that becomes the lid in the base material layer;
A method for producing a laminated sheet, comprising: an integration step in which the base material layer and the sealing layer are bonded to each other with the adhesive layer and the release layer facing each other.

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