JP2023061604A - packaging bag - Google Patents

Abstract

To provide a packaging bag which is easy to open and can be opened without damaging cut lines for opening when filling.SOLUTION: Notches 8a served as points to open are formed on the outer edges of a side seal part 8 on both the left and right sides of a packaging bag 101, a first cut line 3 for assisting opening is formed on a front sheet 1A without contacting the notches, a second cut line 4 for assisting opening is formed on a back sheet 1B without contacting the notches, the first and second cut lines have linear parts 3b, 4b and branched parts 3a, 4a branched from both ends of the linear parts, the notch formation ranges on the front and back sheets are located within the widening range of the tips of the branched parts. The position of the linear part of the first cut line on the front sheet and the position of the linear part of the second cut line on the back sheet are not aligned in the up-down direction and the linear parts of the first and second cut lines are parallel to each other.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a packaging bag, and for example, to a packaging bag having a resealing function such as a zipper pouch.

Techniques are known for enabling a packaging bag (three-side seal type, four-side seal type, standing type, etc.) to be torn straight and easily from a notch that triggers opening. In order to tear the packaging bag straight in the cutting direction, for example, a straight cut film is used for the front and back laminated films that make up the packaging bag, or a straight cut line is formed in the outer layer or intermediate layer of the laminated film. and is being done. However, if the tearing positions of the laminated films on the front and back are the same, it becomes difficult to grasp the opening of each laminated film when taking out the contents, making it difficult to open the packaging bag.

In order to meet the need to make it easier to pick up the opening formed by tearing, a cut line is provided in the laminated film to guide the tear, creating a step between the two laminated films at the opening to make it easier to pick up. A bag is proposed in US Pat. For example, on the outer layer on the front side of the packaging bag, a continuous first cut line is formed starting from the outer edge of the left edge heat-bonded portion and ending at the outer edge of the right edge heat-bonded portion. A continuous second cut line is formed starting from the outer edge of the left edge heat-bonded portion and ending at the outer edge of the right edge heat-bonded portion. Then, by making the formation positions of the first cut line and the second cut line on the rectangular plane of the laminated film partially different in a state where the packaging bag is viewed from above, along the first cut line and the second cut line When the upper end of the packaging bag is torn open in the width direction (the direction perpendicular to the heat-bonded parts on the left and right side edges) by using The outer contour of the cut surface of As a result, a step is generated at the opening, which facilitates the opening when taking out the contents.

In addition, Patent Document 2 proposes a packaging bag with a zipper that can be torn without deviating from the cut line whether it is torn toward the front side or to the back side by devising the shape of the cut line and its combination. . A packaging bag with a zipper as described in Patent Document 2 can be resealed and stored many times with a zipper member even after being opened by tearing the film. ), and is widely used for packaging of pharmaceuticals and supplements (tablets, etc.). However, when the package is re-opened with the chuck member, it may be difficult to open the package because the laminated films on the front and back are in close contact with each other. Particularly for elderly people, the fingertips are slippery, and delicate opening operations can be a burden. Therefore, providing a cut line in the laminated film to guide tearing, thereby creating a level difference between the two laminated films at the opening and facilitating gripping is a great advantage.

JP 2005-289396 A JP 2012-96839 A

However, as described in Patent Literatures 1 and 2, when the two laminated films at the opening are stepped to make it easier to pick up, the range in which the cut line is provided increases in the vertical direction of the packaging bag. Therefore, the filling operation of the contents may become difficult. For example, when using an automatic filling machine that fills the contents into a packaging bag through an opening provided with cut lines and then seals the bag, if the range of the cut lines is large, the jig of the filling machine may get caught on the cut lines. There is a high possibility that the packaging bag will break. Especially in the case of a packaging bag with a zipper, the claws of the filling machine are inserted into the inside of the zipper member, and the zipper member is pushed outward to open. There is a risk that the packaging bag will tear at the cut line.

The present invention has been made in view of such circumstances, and its object is to facilitate opening when taking out the contents, and to prevent damage to the cut line for opening when filling the contents. To provide a packaging bag which can be opened without giving.

In order to achieve the above object, the packaging bag of the first invention is a packaging bag manufactured by sealing a laminated film so that a storage space for storing contents is formed inside,
The laminated film includes a front sheet and a back sheet facing the front sheet through the accommodation space,
Side seal portions formed on both left and right sides of the packaging bag by the front sheet and the back sheet as the seal portions of the laminated film,
An unsealing start structure is formed on the outer edge of at least one of the left and right side seal portions to trigger opening,
A first cut line that assists opening in the front sheet is formed so as not to contact the opening start structure,
A second cut line that assists opening in the back sheet is formed so as not to contact the opening start structure,
The first and second cut lines have a linear portion and a branched portion branched from at least one end thereof,
In each of the front sheet and the back sheet, a formation range of the opening start structure is located within a spread range of tips of the branched portions,
The position of the linear portion of the first cut line on the front sheet and the position of the linear portion of the second cut line on the back sheet are displaced in the vertical direction of the packaging bag, and the first and second It is characterized in that the linear portions of the cut lines are parallel to each other.

A packaging bag of a second invention is, in the above first invention, a tip of a branch shape portion of the first cut line on the front sheet, a tip of a branch shape portion of the second cut line on the back sheet, are matched.

A packaging bag according to a third invention is the packaging bag according to the second invention, wherein the branched portions have a V shape at the first and second cut lines, and at least one of the branched portions is asymmetrically deformed. It is characterized by having a V-shape.

A packaging bag according to a fourth invention is the packaging bag according to any one of the first to third inventions, wherein the opening start structure is formed on the outer edge of the side seal portion on both the left and right sides, and the first and second cuts are formed. It is characterized in that branched portions of the line are formed at both ends of the linear portion.

The packaging bag of the fifth invention is the position of the linear portion of the first cut line and the position of the linear portion of the second cut line in any one of the first to fourth inventions. It is characterized in that the amount of deviation is 0.5 to 4 mm.

A packaging bag according to a sixth aspect of the invention is characterized in that, in any one of the first to fifth aspects of the invention, the laminated film includes a substrate layer and a thermoplastic resin layer.

A packaging bag according to a seventh invention is characterized in that, in the sixth invention, at least one intermediate layer is included between the base material layer and the thermoplastic resin layer.

A packaging bag according to an eighth invention is the packaging bag according to the seventh invention, wherein at least one of the first and second cut lines is provided on at least one of the base material layer and the intermediate layer. It is characterized by

A packaging bag according to a ninth invention is the packaging bag according to the seventh or eighth invention, wherein at least one of the base material layer, the intermediate layer, and the thermoplastic resin layer extends from one side seal portion to the other side seal portion. It is characterized by having a straight cutting property that guides straight tearing to the side seal portion.

A packaging bag of a tenth invention is a packaging bag made by sealing a laminated film so that a storage space for storing contents is formed inside,
The laminated film includes a front sheet and a back sheet facing the front sheet through the accommodation space,
Side seal portions formed on both left and right sides of the packaging bag by the front sheet and the back sheet as the seal portions of the laminated film,
An unsealing start structure is formed on an outer edge of at least one of the left and right side seal portions, and is a trigger for unsealing.
A first cut line that assists opening in the front sheet is formed so as not to contact the opening start structure,
A second break line that assists opening in the back sheet is formed so as not to contact the opening start structure,
The first and second cut lines are composed of a V-shaped portion having a sideways V-shape,
the bent position of the V-shaped portion of the front sheet and the bent position of the V-shaped portion of the back sheet are displaced in the vertical direction of the packaging bag,
In each of the front sheet and the back sheet, a formation range of the opening start structure is located within a spread range of a tip of the V-shaped portion,
In each of the front sheet and the back sheet, at least one layer constituting the laminated film has straight cutting properties that guide linear tearing from one side seal portion to the other side seal portion. characterized by

The packaging bag of the eleventh invention, in any one of the first to tenth inventions, further has a chuck member that enables resealing and re-opening between the front sheet and the back sheet, It is characterized in that the chuck member is positioned on the accommodation space side of the first and second cut lines.

A packaging bag according to a twelfth aspect of the present invention is characterized in that, in any one of the first to eleventh aspects of the invention, the contents are hermetically packaged while being accommodated in the accommodation space.

According to the present invention, since the formation range of the first and second cut lines is small, even if the packaging bag receives force, the first and second cut lines are less likely to be the starting point of tearing. For example, even when using an automatic filling machine that fills the contents into a packaging bag through an opening provided with first and second cut lines and then seals the bag, the jig of the filling machine may get caught on the cut lines and the packaging bag may be damaged. You can prevent it from breaking. In addition, since the formation range of the opening start structure is positioned within the widening range of the tip of the branched portion or the V-shaped portion, tearing from the opening start structure is reliably guided to each cut line. Moreover, since the positions of the first and second cut lines are misaligned, the positions of tearing the laminated films on the front and back sides are misaligned. becomes easier. Therefore, it is possible to realize a packaging bag that can be easily opened when the contents are taken out and can be opened without damaging the first and second cut lines for unsealing when filling the contents. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS The external view which shows 1st Embodiment of a packaging bag. The external view which shows 2nd Embodiment of a packaging bag. FIG. 2 is a cross-sectional view showing the L1-L1′ line cross section of FIG. 1(A); FIG. 3 is a sectional view showing the L2-L2′ line cross section and the L3-L3′ line cross section of FIG. 2(A); The top view which shows the opening part which was torn by the guide in the 1st, 2nd cut line, and the level|step difference produced. The top view which shows the specific example of the 1st, 2nd cut line used for 1st Embodiment. The top view which shows the specific example of the 1st, 2nd cut line used for 2nd Embodiment. FIG. 2 is a plan view showing Examples 1 to 4 and Comparative Examples 1 to 4 of packaging bags;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, packaging bags, packaged products, etc. according to embodiments of the present invention will be described with reference to the drawings. In addition, the same reference numerals are given to the same parts or corresponding parts in each embodiment, specific example, etc., and duplication of explanation will be omitted as appropriate.

1 schematically shows the schematic structure of a packaging bag 101 and a packaged product 201 according to the first embodiment, and FIG. 3 schematically shows the cross-sectional structure of the packaging bag 101. As shown in FIG. FIG. 2 schematically shows schematic structures of a packaging bag 102 and a packaged product 202 according to the second embodiment, and FIG. 4 schematically shows a cross-sectional structure of the packaging bag 102. As shown in FIG. 1 and 2, (A) is a plan view showing the standing-type packaging bags 101 and 102 in a folded state, and (B) is a sealed packaging bag 101 and 102 containing a content F (food, etc.). It is a front view showing packaged products 201 and 202 (packaged foods, etc.). 3 is a cross-sectional view along the line L1-L1' of FIG. 1A, FIG. 4A is a cross-sectional view along the line L2-L2' of FIG. 2A, and FIG. 4B is a cross-sectional view of FIG. A) is a cross-sectional view taken along line L3-L3'.

The packaging bags 101 and 102 are composed of three packaging materials, a front sheet 1A, a back sheet 1B and a bottom sheet 1C (FIGS. 1 and 2), all of which are made of laminated films (FIGS. 3 and 3). Figure 4). Then, the laminated film is heat-sealed (thermally bonded) to form a standing pouch so that a storage space 7 for storing the contents F is formed inside the packaging bags 101 and 102 . Therefore, it is possible to manufacture using a general standing pouch bag making machine, and the heat seal is within a range that does not impair the properties and functions of the product when making bags with a continuous bag making machine that manufactures actual products. It is performed under sealing temperature conditions. The form of the packaging bags 101 and 102 is not limited to standing pouches, and may be flat pouches (three-sided seal type, four-sided seal type, etc.).

The front sheet 1A and the back sheet 1B are arranged so as to face each other with an accommodation space 7 interposed therebetween, and are heat-sealed at the left and right peripheries in a superimposed state. A bottom sheet 1C forming a two-fold gusset portion between the sheets is heat-sealed at the peripheries thereof to the lower ends of the front sheet 1A and the back sheet 1B. However, the upper edges of the front sheet 1A and the back sheet 1B are not sealed (FIGS. 3 and 4). That is, in the packaging bags 101 and 102 ((A) of FIGS. 1 and 2), the side seal portions 8 formed by heat-sealing the front sheet 1A and the back sheet 1B, and the front sheet 1A and the back sheet 1B, respectively. and a gusset-sealed portion 9 formed by heat sealing with the bottom sheet 1C form an accommodation space 7, and an opening 10h is formed above the accommodation space 7. As shown in FIG.

The opening 10h is used as a filling port for contents F (food, cosmetics, detergents, medicines, supplements, etc.; forms: liquid, gel, solid, powder, etc.). After filling the contents F from the openings 10h into the storage spaces 7 of the packaging bags 101 and 102 formed with the side seal portions 8 and the gusset seal portions 9, the front sheet 1A and the back sheet 1B are heat-sealed to seal the head. When the portion 10 ((B) of FIGS. 1 and 2) is formed, packaged products 201 and 202 sealed and packaged with the contents F housed in the housing space 7 are obtained.

As shown in FIGS. 3 and 4, the laminated films (front sheet 1A, back sheet 1B, and bottom sheet 1C) constituting the packaging bags 101 and 102 include a base layer 11 as an outer layer and a sealant as an inner layer. It consists of a layer (thermoplastic resin layer) 13 and an intermediate layer 12 (aluminum layer, printing ink layer, adhesive layer, etc.) provided therebetween. That is, the laminated film has a laminated structure including the base material layer 11, the intermediate layer 12, and the sealant layer 13 from the outside of the packaging bag to the inside of the packaging bag. Although the laminated film may have a laminated structure of three or more layers in this way, it may have a laminated structure of two layers consisting of the substrate layer 11 and the sealant layer 13 . In addition, a sandwich lamination method, a dry lamination method, etc. are mentioned as a lamination method of each layer in a lamination|stacking film.

The base material layer 11 is required to have the strength to protect the contents F, the strength as a printing base material that can withstand the load of printing work, and the ease of tearing the laminated film when unsealed.・It is preferable to use a synthetic resin film that has excellent chemical properties. From this point of view, specific examples of the base material layer 11 include polyester films such as polyethylene terephthalate (PET) film, transparent vapor deposition polyethylene terephthalate (VMPET) film, biaxially oriented nylon (ONY) film, and oxygen barrier properties. polyamide-based films such as special ONY films, polypropylene-based films such as biaxially oriented polypropylene (OPP) films, and polyethylene-based films such as biaxially oriented polyethylene (OPE) films.

The properties of the functional film used for the base material layer 11 include barrier properties, puncture properties, straight cutting properties, and the like. A straight cutting film having cuttability and the like can be mentioned. The straight cutting film has a straight cutting property that guides the straight tearing in a predetermined cutting direction. It is tear-guided straight from one side seal portion 8 to the other side seal portion 8. - 特許庁The thickness of the film constituting the base material layer 11 can be selected as appropriate, but is preferably about 12 to 25 μm.

The material of the intermediate layer 12 can be appropriately selected according to the physical properties (barrier property, puncture property, etc.) required for the packaging bags 101 and 102. Specific examples thereof include an aluminum layer, a printing ink layer, and an adhesive layer. etc. As the aluminum layer forming the intermediate layer 12, for example, a barrier layer made of an annealed aluminum foil can be used, and the thickness thereof is preferably about 6 to 15 μm. Alternatively, an aluminum-deposited PET film, an aluminum-deposited ONY film, or the like may be used. Examples of the printing ink layer forming the intermediate layer 12 include those made of colored ink such as a white ink layer and a pattern layer. As the adhesive layer constituting the intermediate layer 12, for example, one made of an adhesive for dry lamination generally used in the dry lamination method can be used. As the intermediate layer 12, from the viewpoint of protection of the contents F, etc., the same film layer as the base layer 11 (polyester film such as PET film, etc.) may be used. good too.

The sealant layer 13 is provided to form the housing space 7 by laminating two laminated films and to seal the contents F therein. The bonding is performed by bringing the sealant layers 13 into contact with each other and heating them. For example, the substrate layer 11 and the intermediate layer 12 are laminated by dry lamination, extrusion lamination, or the like. Therefore, the sealant layer 13 is positioned at the innermost side of the packaging bags 101 and 102 when the bags are manufactured (FIGS. 3 and 4). Further, the sealant layer 13 may be a layer formed of a thermoadhesive resin that can be melted and welded to each other by heat. can be appropriately selected and used. For example, one having the aforementioned straight cutting property may be used.

Specific examples of the sealant layer 13 include polyethylene-based films (PE films) such as linear low-density polyethylene (LLDPE) films and low-density polyethylene (LDPE) films, polypropylene-based films such as unstretched polypropylene (CPP) films ( PP film) and the like. In addition, the thickness of the film constituting the sealant layer 13 can be appropriately determined in consideration of the required physical properties (heat sealability), cost, etc., but it is about 10 to 100 μm, particularly about 40 to 60 μm. is preferred.

Specific examples of the general laminated structure (base layer 11/intermediate layer 12/sealant layer 13) of the laminated film (front sheet 1A, back sheet 1B, bottom sheet 1C) include:
PET12/printing ink, ALM7/PE40,
VMPET12/printing ink/PE50,
PET12/printing ink, ALM7, straight cutting PET12/PE40,
PET12/printing ink, ALM7, straight cutting OPP20/PE40,
PET12/ALM7/LDPE60,
PET12/ALM7/LLDPE60,
PET12/ALM7, PET12/LLDPE60,
OPP20/PET12, ALM7/LLDPE60,
Special ONY15/ALM7/LLDPE60,
is mentioned.

however,
PET12: polyethylene terephthalate film, thickness 12 μm,
ALM7: aluminum foil, thickness 7 μm,
PE40, PE50: polyethylene film, thickness 40, 50 µm,
VMPET12: Transparent evaporated polyethylene terephthalate, thickness 12 μm,
Straight cutting PET12: Stretched PET film having straight cutting property, thickness 12 μm,
Straight cutting property OPP20: stretched polypropylene film having straight cutting property, thickness 20 μm,
LDPE60: low density polyethylene film, thickness 60 μm,
LLDPE60: linear low-density polyethylene film, thickness 60 μm,
OPP20: biaxially oriented polypropylene film, thickness 20 μm,
Special ONY15: biaxially oriented nylon with oxygen barrier properties, thickness 15 μm,
is.

An opening structure and a resealing structure are provided on the upper portions of the packaging bags 101 and 102 . As shown in FIGS. 1 and 2, the unsealing structure is composed of a first cut line 3, a second cut line 4, a notch 8a, etc., and the resealing structure is composed of a chuck member 2 made of thermoplastic resin. ing. The tearing of the laminated film (front sheet 1A, back sheet 1B) at the time of opening is guided by the first and second cut lines 3 and 4 starting from the notches 8a provided on the outer edges of the side seal portions 8 on both left and right sides. be done. That is, the notch 8a serves as a trigger for opening, the first cut line 3 assists the opening of the front sheet 1A, and the second cut line 4 assists the opening of the back sheet 1B.

Since the opening structure is located between the head seal portion 10 and the chuck member 2 ((B) of FIGS. 1 and 2), when the packaged product 201 is opened with the opening structure, the portion including the head seal portion 10 is opened. is cut off, and the opening and closing (resealing/reopening) of the packaging bags 101 and 102 can be performed by the chuck member 2 (fastener function). FIG. 5 shows an opening 10h in which a step 5 is formed by being torn (in the direction of arrow ma) by the guides at the first and second cut lines 3 and 4. As shown in FIG.

In addition, since the chuck member 2 is provided at a position closer to the center of the packaging bags 101 and 102 than the unsealing structure, the accommodation space 7 is reduced by the initial unsealing by the unsealing structure. It becomes easy to get caught in. Therefore, if resealing/reopening of the packaging bags 101 and 102 is unnecessary, the chuck member 2 may be omitted.

The chuck member 2 is provided between the front sheet 1A and the back sheet 1B, as shown in FIGS. It is composed of grooved members 2a provided on the sealant layer 13 of the front sheet 1A and ridged members 2b provided on the sealant layer 13 of the backsheet 1B. It is possible to attach and detach by fitting with 2b. Since the grooved member 2a and the ridged member 2b are formed over the entire left-right direction from one side seal portion 8 to the other side seal portion 8 (FIGS. 1 and 2), the grooved member 2a and the ridged member 2b The resealing of the packaging bags 101 and 102 becomes possible by engaging with the member 2b (resealing function). Therefore, since the packaging bags 101 and 102 can be easily resealed without using adhesive tapes, clips, etc., entry of moisture and dust into the accommodation space 7 is suppressed, and the remaining contents F are sanitized. can be stored

The grooved member 2a may be provided on the sealant layer 13 of the backsheet 1B, and the protruded member 2b may be provided on the sealant layer 13 of the frontsheet 1A. That is, the arrangement of the grooved members 2a and the ridged members 2b is not limited to those shown in FIGS. , and the ridge member 2 b provided on the other sealant layer 13 may constitute the chuck member 2 .

The fixing of the grooved member 2a and the raised member 2b to the front sheet 1A and the back sheet 1B is performed by heat sealing with each sealant layer 13. As shown in FIG. For example, a long chuck member 2 wound in a roll is drawn out, sandwiched at a predetermined position between the front sheet 1A and the back sheet 1B, and heat-sealed with a heat seal bar. By supplying the chuck member 2 in accordance with the arrangement of the heat seal bars, the concave member 2a can be heat-sealed to the front sheet 1A, and the convex member 2b can be heat-sealed to the back sheet 1B. By interposing a heat insulating plate between the grooved member 2a and the ridged member 2b, it is possible to prevent the grooved member 2a and the ridged member 2b from being heat-sealed. It becomes possible to heat-seal the member 2 continuously at the same time.

The home-base-shaped notches 8a (FIGS. 1 and 2) that constitute the unsealing structure are located at the upper portions of the left and right side seal portions 8, and the outer edges of the left and right ends of the notches 8a serve as starting points for unsealing (i.e., triggers for unsealing). It is formed as an opening start structure so that it becomes. However, the formation range of the notches 8a is limited to the formation range of the side seal portions 8 (between the outer edge of the left and right side seal portions 8 and the position not reaching the inner edge thereof). In addition, since the left and right notches 8a are formed so as to collectively penetrate the front sheet 1A and the back sheet 1B, the positions in the vertical direction of the packaging bags 101 and 102 (from the opening 10h or the outer edge of the head seal portion 10) distance) are the same.

The shape of the notch 8a is not limited to the home base shape, and may be a V shape (V notch), a U shape (U notch), a linear shape (I notch), a polygonal shape, or the like. The notch 8a used here is a UV notch (base notch) formed into a home base shape by combining a U-shape and a V-shape. etc. In addition, an MP notch having fine scratches may be used as the notch 8a so as not to get caught during transportation.

The direction of the notch 8a is set so that the tearing direction from the notch 8a coincides with the direction of easy linear tearing of the laminated film (front sheet 1A, back sheet 1B) (for example, linear cuttability of the sealant layer 13). is preferred. In the packaging bag 102 (FIG. 2, etc.), the base material layer 11 utilizes the straight cutting property, which will be described later. Further, by providing an indication such as a cut or an opening at the location where the notch 8a is formed, the consumer can easily recognize the unsealing position. The display can be applied by gravure printing or the like when forming a printing ink layer as the intermediate layer 12 .

The first and second cut lines 3 and 4 constituting the unsealing structure are half-cut lines formed on the surface of the laminated film (front sheet 1A, back sheet 1B) with a depth that does not penetrate in the thickness direction. 3 and 4, the first cut line 3 is formed in the base material layer 11 of the front sheet 1A, and the second cut line 4 is formed in the base material layer 11 of the back sheet 1B. . The first and second cut lines 3 and 4 are both formed in the base material layer 11 by a full cut, but may be formed in the base material layer 11 by a half cut. Also, the first and second cut lines 3 and 4 may be formed in the intermediate layer 12, and even in that case, it is possible to obtain the same effects as when they are formed in the base material layer 11. FIG.

The first and second cut lines 3 and 4 are preferably formed by laser cutting using a pulse oscillation laser or the like (laser tear guide). Examples of lasers used for laser cutting include carbon dioxide lasers, YAG lasers, semiconductor lasers, argon ion lasers, and the like. Alternatively, the first and second cut lines 3 and 4 may be formed mechanically with a die roll or the like.

In the packaging bag 101 (FIG. 1), first and second cut lines 3 and 4 are formed on the front sheet 1A and the back sheet 1B from one side seal portion 8 to the other side seal portion 8, respectively. The first and second cut lines 3, 4 have linear portions 3b, 4b and branched portions (V-shaped portions) 3a, 4a branched from both ends thereof, and are continuous and continuous as a whole. It has a symmetrical shape. That is, branched portions 3a and 4a having a lateral V shape (a so-called bird's foot shape) are formed at both ends of the linear portions 3b and 4b (the bending positions of the left and right V-shaped portions are linear). 3b and 4b are connected in the horizontal direction).

On the other hand, in the packaging bag 102 (FIG. 2), the front sheet 1A and the back sheet 1B have a range in which the first and second cut lines 3 and 4 are not formed between the left and right side seal portions 8 . In other words, each of the first and second cut lines 3 and 4 consists of two parts separated to the left and right, and the left and right linear parts 3b and 4b and the branch branched from the end of one side (notch 8a side) It is configured to have shape portions 3a and 4a.

As described above, in the packaging bags 101 and 102 (FIGS. 1 and 2), the first cut line 3 for assisting the opening of the front sheet 1A is composed of a linear portion 3b and a branched portion branched from at least one end thereof. 3a, and the second cut line 4 for assisting opening in the back sheet 1B has a straight portion 4b and a branched portion 4a branched from at least one end thereof. The first and second cut lines 3 and 4 are formed so as not to touch the notch 8a. It is located within the widening range of the tip of 4a. That is, the branched portions 3a and 4a are formed so as to surround the notch 8a from one side.

The position of the linear portion 3b of the first cut line 3 on the front sheet 1A and the position of the linear portion 4b of the second cut line 4 on the back sheet 1B are displaced in the vertical direction of the packaging bags 101 and 102 (linear shape mismatch), the linear portions 3b, 4b of the first and second cut lines 3, 4 are parallel to each other. For example, the amount of deviation between the position of the linear portion 3b of the first cut line 3 and the position of the linear portion 4b of the second cut line 4 is 0.5 to 4 mm. Note that this amount of deviation is d1=1 mm or d2=2 mm in specific examples (FIGS. 6 and 7) to be described later.

Although the relative positions of the linear portions 3b and 4b with respect to the front and back sheets 1A and 1B are shifted as described above, the tip of the branch shape portion 3a of the first cut line 3 in the front sheet 1A and the back sheet 1B and the tip of the branch shape portion 4a of the second cut line 4 in . In other words, the widening range of the tips of the branch-shaped portions 3a and 4a (that is, the opening for tearing) is the same. This is because the branch-shaped portion 3a has a symmetrical V-shape, whereas the branch-shaped portion 4a has an asymmetrically deformed V-shape (mismatch of V-shapes). By making the branched portion 4a asymmetrically deformed, the bent position of the branched portion 4a on the back sheet 1B is shifted by the same amount as the relative displacement of the linear portions 3b, 4b of the packaging bags 101, 102. It can be moved up and down. Therefore, it is possible to keep the branched portion 4a branched from the linear portion 4b so that the formation range of the notch 8a is positioned within the widening range of the tips of the branched portions 3a and 4a.

Pinch the upper portion of the side seal portion 8 on one side (for example, the portion overlapping with the head seal portion 10), and pull the front sheet 1A and the back sheet 1B from the notch 8a of the side seal portion 8 toward the branched portions 3a and 4a. Tearing initiates the opening of the packaged product 201 . Both the first and second cut lines 3 and 4 are formed so as not to touch the notch 8a, and the formation range of the notch 8a is located within the spread range of the tips of the branched portions 3a and 4a. , the tear from the notch 8a is first received by the branched shaped portions 3a, 4a and guided to the next straight shaped portions 3b, 4b. Then, the tearing of the front sheet 1A and the back sheet 1B progresses simultaneously while being guided by the first and second cut lines 3 and 4. - 特許庁Finally, the portion including the head seal portion 10 is cut off, and the packaging bags 101 and 102 are opened as shown in FIG.

In the packaging bag 101 (FIG. 1), tearing of the front and back sheets 1A, 1B is guided in the order of the branched portions 3a, 4a; the linear portions 3b, 4b; and the branched portions 3a, 4a. On the other hand, in the packaging bag 102 (FIG. 2), since the base material layer 11 is composed of a straight cut film, the tearing of the front and back sheets 1A and 1B can be divided into branched portions 3a and 4a; 4b; straight cutability of the base material layer 11; linear portions 3b and 4b; branched portions 3a and 4a are guided in this order.

In the packaging bag 102 (FIG. 2), the rectilinear cutting property of the base material layer 11 guides the linear tearing of the packaging bag 102 in the left-right direction. There may be a range in which the second cut lines 3 and 4 are not formed. Also, layers other than the base material layer 11 may be imparted with straight cutting properties. In other words, at least one of the base layer 11, the intermediate layer 12, and the sealant layer 13 has straight cutting properties that guide straight tearing from one side seal portion 8 to the other side seal portion 8. Anything is fine.

When filling the contents F from the opening 10h into the packaging bags 101 and 102 (FIGS. 1 and 2), the claws of the filling machine are inserted into the chuck member 2 from the opening 10h, and the chuck member 2 is pushed from the inside to the outside. When the front and back sheets 1A and 1B are pushed open toward the front and rear sheets 1A and 1B, a large force is applied to the central portions thereof. When the formation range of the first and second cut lines 3 and 4 is large (such as when there is an oval-shaped portion), there is a possibility that the claws of the filling machine will catch on the first and second cut lines 3 and 4 and tear the bag. get higher Therefore, it is preferable to minimize the formation range of the first and second cut lines 3 and 4 in the central portions of the front and back sheets 1A and 1B so that the front and back sheets 1A and 1B are less likely to tear.

From the above point of view, in the packaging bags 101, 102, the first and second cut lines 3, 4 have linear portions 3b, 4b and branched portions 3a, 4a branched from at least one end thereof, and the linear shape Since the portions 3b and 4b are displaced and arranged parallel to each other, it is possible to reduce the formation range of the first and second cut lines 3 and 4 to the minimum in the vertical direction (filling suitability). . In the packaging bag 102, the first and second cut lines 3 and 4 are not formed between the left and right side seal portions 8 (the central portion of the packaging bag 102). , the second break lines 3 and 4 receive almost no damage.

In the packaging bags 101 and 102, since the step 5 is surely generated at the linear portions 3b and 4b (bag cutability), it is possible to easily widen the opening by pinching the step 5 with the fingertips (bag opening property). ). Therefore, not only when the packaged products 201 and 202 are first opened by tearing the laminated film, but also when the packaging bag 101 resealed by the chuck member 2 is opened again, easy opening becomes possible. As a result, it becomes possible to take out the contents F from the packaging bag 101 easily and quickly.

Moreover, in the packaging bags 101 and 102, the branch shape portion 4a is formed into an asymmetrically deformed shape so that the formation range of the notch 8a is located within the spread range of the tips of the branch shape portions 3a and 4a. It is possible to reliably induce tearing from 8a to branched portions 3a and 4a (bag cuttability). As a result, it is possible to widen the formation range of the step 5 in the horizontal direction by enlarging the linear portions 3b and 4b close to the notch 8a. At a position close to the notch 8a, damage to the linear portions 3b and 4b during filling of the contents F is small (filling aptitude), and a large step 5 in the left-right direction enables easier opening (bag openness).

FIG. 6 shows specific examples of the first and second cut lines 3 and 4 used in the first embodiment, and FIG. 7 shows specific examples of the first and second cut lines 3 and 4 used in the second embodiment. Give an example. In FIGS. 6 and 7, the size of each part is indicated by d1=1 mm, d2=2 mm, d3=3 mm, and d4=4 mm. Considering the use of the packaging bags 101 and 102 according to the contents F (food etc.), for example, when the size of the packaging bags 101 and 102 is length (vertical direction): 156 mm x width (horizontal direction): 120 mm, The horizontal size of the first and second cut lines 3 and 4 is 4 mm for the branch shape portions 3a and 4a and 107 mm for the linear portion 3b, and the vertical size of the branch shape portions 3a and 4a is 4 mm. .

FIG. 6(A) shows the first and second cut lines 3, 4 used in the packaging bag 101 (FIG. 1), and FIG. 7(A) shows the packaging bag 102 (FIG. 2). The first and second cut lines 3, 4 are shown. In the first and second cut lines 3 and 4 shown in FIGS. 6A and 7A, the linear portion 4b is shifted upward, so that the step 5 (FIG. 5) The formation exposes the inner surface of the backsheet 1B. On the other hand, in the first and second cut lines 3 and 4 shown in FIGS. 6(B) and 7(B), since the linear portion 4b is displaced downward, the step 5 ( 5) exposes the inner surface of the front sheet 1A.

In the first and second cut lines 3 and 4 shown in FIGS. 6A and 7A, the branched portion 3a has a symmetrical V-shape, and the branched portion 4a is asymmetrically deformed. It has a V shape. On the other hand, in the first and second cut lines 3 and 4 shown in FIGS. 6(C) and 7(C), the branched portions 3a and 4a both have asymmetrically deformed V-shapes. . That is, the first and second cut lines 3 and 4 shown in FIGS. 6(C) and 7(C) are the first and second cut lines 3 and 4 shown in FIGS. 6(B) and 7(B), the first cut line 3 having the same shape as the second cut line 4 shown in FIGS. 6(B) and 7(B) is used. Therefore, the amount of positional deviation of the linear portions 3b and 4b is d1×2=d2=2 mm.

In FIGS. 6 and 7 (A) to (C), on the first and second cut lines 3 and 4, the branch shape portions 3a and 4a have a V shape, and at least one of the branch shape portions 3a , 4a have an asymmetrically deformed V shape. With this configuration, if the formation range of the notch 8a is positioned within the widening range of the tips of the branched portions 3a and 4a, it is possible to reliably induce tearing from the notch 8a to the branched portions 3a and 4a. (bag cutability).

In the first and second cut lines 3 and 4 shown in FIGS. 6A and 7A, the branched portion 3a has a symmetrical V-shape, and the branched portion 4a is asymmetrically deformed. It has a V shape. On the other hand, in the first and second cut lines 3 and 4 shown in FIGS. 6(D) and 7(D), the branched portions 3a and 4a both have symmetrical V-shapes. That is, in the first and second cut lines 3, 4 shown in FIGS. 6(D) and 7(D), the first and second cut lines 3, 4 shown in FIGS. 6(A) and 7(A) , the second cut line 4 having the same shape as the first cut line 3 is arranged parallel to the first cut line 3. Therefore, the tip of the branched portion 3a of the first cut line 3 in the front sheet 1A does not match the tip of the branched portion 4a of the second cut line 4 in the back sheet 1B. However, if the formation range of the notch 8a is located within the common spread range of the tips of the branch shape portions 3a and 4a, it is possible to reliably induce the tear from the notch 8a to the branch shape portions 3a and 4a. (bag cutability).

The first and second cut lines 3 and 4 shown in FIG. 7(E) are obtained by omitting the linear portions 3b and 4b from the first and second cut lines 3 and 4 shown in FIG. 7(A). In other words, the first and second cut lines 3 and 4 consist only of laterally V-shaped branched portions (V-shaped portions) 3a and 4a. Similar to the first and second cut lines 3 and 4 shown in FIG. 7(A) and the like, the bending position of the branch-shaped portion 3a on the front sheet 1A and the bending position of the branch-shaped portion 4a on the back sheet 1B correspond to the packaging bag. 101 and 102 are shifted in the vertical direction. Also, in each of the front and back sheets 1A and 1B, the formation range of the notch 8a is located within the spread range of the tips of the V-shaped portions 3a and 4a (see FIG. 2, etc.). Therefore, as described above, in each of the front and back sheets 1A and 1B, since at least one layer constituting the laminated film has a straight cutting property, the side seal portion 8 from one side seal portion 8 to the other side seal portion 8 can be separated from the other side seal portion 8. It is possible to guide a linear tear to the

As described above, since the formation range of the first and second cut lines 3 and 4 is small, even if the packaging bags 101 and 102 receive force, the first and second cut lines 3 and 4 become the starting points of tearing. Hateful. For example, even when using an automatic filling machine that fills the packaging bags 101 and 102 with the contents F from the opening 10h provided with the first and second cut lines 3 and 4 and seals them, the jig of the filling machine is It is possible to prevent the packaging bags 101, 102 from being caught on the cut lines 3, 4 and torn (filling aptitude). In addition, since the formation range of the notches 8a and 18a is located within the widening range of the tips of the branched portions (or V-shaped portions) 3a and 4a, tearing from the notches 8a and 18a is caused by the cut lines 3 and 4. reliably induced (bag cutability). Moreover, since the positional deviation of the first and second cut lines 3 and 4 causes a deviation in tearing positions of the front and back laminated films, the opening 10h of each laminated film can be easily pinched when taking out the contents F. , the opening of the packaging bags 101 and 102 becomes easy (bag openability). Therefore, it is easy to open when taking out the contents F, and when filling the contents F, it is possible to open without damaging the first and second cut lines 3 and 4 for unsealing. Packaging bags 101, 102 can be realized.

As described above, the packaging bags 101 and 102 have excellent manufacturability, and also have excellent properties such as ease of taking out the contents F and resealing/reopening after opening, so that they can be manufactured at low cost. It is possible to realize high usability and the like. The opening structure and resealing structure described above are applicable not only to the standing type packaging bags 101 and 102, but also to other types of packaging bags (four side seal type, three side seal type, etc.). It is possible to obtain the effect of

Hereinafter, the packaging bag etc. which implemented this invention are demonstrated more concretely. Packaging bags E1 and E2 (FIGS. 8A and 8B) of Examples 1 to 4 (EX1 to 4) and packaging bags C1 and C2 of Comparative Examples 1 to 4 (CX1 to 4) (FIGS. 8(C) and (D)) are three-sided seal type flat pouches formed by heat-sealing the front sheet 1A and the back sheet 1B, and having side seal portions 18 and bottom seal portions 19 formed as heat seal portions. is. V-shaped notches 18a are formed as an unsealing start structure in the side seal portions 18 on both the left and right sides of the packaging bags E1, E2, C1, and C2. A chuck member 2 is provided between the space 7 (near the center of the packaging bag below the first and second cut lines 3 and 4), similar to the packaging bags 101 and 102 (FIGS. 1 and 2). ing.

In the packaging bag E1 (FIG. 8A) of Examples 1 and 2 (EX1 and 2), first and second cut lines 3 and 4 similar to the packaging bag 101 (FIG. 1) are formed, The packaging bag E2 (FIG. 8B) of Examples 3 and 4 (EX3, 4) has first and second cut lines 3, 4 similar to the packaging bag 102 (FIG. 2). In addition, in the packaging bags C1 (FIG. 8C) of Comparative Examples 1 and 2 (CX1 and 2), linear first and second cut lines 3, 3 4 are formed to connect the notches 18a on the left and right sides. In the packaging bag C2 (FIG. 8(D)) of Comparative Examples 3 and 4 (CX3 and 4), a first cut line 3 consisting of an oval-shaped portion and a linear portion connecting from both left and right sides to the notch 18a is formed on the front surface. The back sheet 1B is formed with straight second cut lines 4 that are formed in the sheet 1A and connect the notches 18a on both left and right sides.

<Embodiment 1 (EX1), Fig. 8 (A)>
The packaging material specification (laminated structure of front sheet 1A and back sheet 1B) is PET 12 μm/printing ink/adhesive/aluminum foil 7 μm/adhesive/PE film 40 μm. The first and second cut lines 3 and 4 of the packaging bag E1 were processed on the PET surface using a CO ₂ laser so that the positional displacement amount was 1 mm in the vertical direction of the packaging bag E1.

<Embodiment 2 (EX2), Fig. 8 (A)>
The specification of the packaging material (laminated structure of front sheet 1A and back sheet 1B) is 12 μm of transparent vapor-deposited PET/printing ink/adhesive/50 μm of PE film. The first and second cut lines 3 and 4 of the packaging bag E1 were processed on the PET surface using a die roll so that the positional displacement amount was 1 mm in the vertical direction of the packaging bag E1.

<Embodiment 3 (EX3), Fig. 8 (B)>
The packaging material specifications (laminated structure of front sheet 1A and back sheet 1B) are PET 12 μm/printing ink/adhesive/aluminum foil 7 μm/adhesive/straight cut PET 12 μm/adhesive/PE film 40 μm. The first and second cut lines 3 and 4 of the packaging bag E2 were processed on the PET surface using a CO ₂ laser so that the amount of displacement was 1 mm in the vertical direction of the packaging bag E2.

<Example 4 (EX4), Fig. 8 (B)>
The packaging material specifications (laminated structure of front sheet 1A and back sheet 1B) are PET 12 μm/printing ink/adhesive/aluminum foil 7 μm/adhesive/straight cutting OPP 20 μm/adhesive/PE film 40 μm. The first and second cut lines 3 and 4 of the packaging bag E2 were processed on the PET surface using a CO ₂ laser so that the amount of displacement was 1 mm in the vertical direction of the packaging bag E2.

<Comparative example 1 (CX1), Fig. 8 (C)>
The packaging material specification (laminated structure of front sheet 1A and back sheet 1B) is PET 12 μm/printing ink/adhesive/aluminum foil 7 μm/adhesive/PE film 40 μm. The first and second cut lines 3, 4 of the packaging bag C1 were processed on the PET surface using a _CO2 laser.

<Comparative example 2 (CX2), Fig. 8 (C)>
The specification of the packaging material (laminated structure of front sheet 1A and back sheet 1B) is 12 μm of transparent vapor-deposited PET/printing ink/adhesive/50 μm of PE film. The first and second cut lines 3 and 4 of the packaging bag C1 were processed on the PET surface using a die roll.

<Comparative Example 3 (CX3), FIG. 8 (D)>
The packaging material specifications (laminated structure of front sheet 1A and back sheet 1B) are PET 12 μm/printing ink/adhesive/aluminum foil 7 μm/adhesive/straight cut PET 12 μm/adhesive/PE film 40 μm. The first and second cut lines 3, 4 of the packaging bag C2 were processed on the PET surface using a _CO2 laser.

<Comparative Example 4 (CX4), FIG. 8 (D)>
The packaging material specifications (laminated structure of front sheet 1A and back sheet 1B) are PET 12 μm/printing ink/adhesive/aluminum foil 7 μm/adhesive/straight cutting OPP 20 μm/adhesive/PE film 40 μm. The first and second cut lines 3, 4 of the packaging bag C2 were processed on the PET surface using a _CO2 laser.

Table 1 shows the evaluation results of filling suitability, bag cuttability and bag opening property of Examples 1 to 4 (EX1 to 4) and Comparative Examples 1 to 4 (CX1 to 4). However, regarding the filling aptitude, ◎: no tearing of the packaging bag during filling (tear from the cut line), ○: almost no tearing of the packaging bag during filling (tear from the cut line), ×: packaging at the time of filling It is assumed that there is tearing of the bag (tear from the cut line). There is almost no tearing), ×: There is tearing away from the predetermined position (tearing off the cut line). : It was said that it was difficult to pinch the opening.

1A front sheet (laminated film)
1B back sheet (laminated film)
1C bottom sheet (laminated film)
2 Chuck member 2a Groove member 2b Protruding member 3 First cut line 3a Branched portion (V-shaped portion)
3b linear portion 4 second cut line 4a branched portion (V-shaped portion)
4b linear portion 5 step 7 accommodation space 8 side seal portion 8a notch (unsealing start structure)
9 gusset seal portion 10 head seal portion 10h opening portion 11 base layer 12 intermediate layer 13 sealant layer (thermoplastic resin layer)
18 side seal part 18a notch (unsealing start structure)
19 Bottom seal part 101, 102, E1, E2, C1, C2 Packaging bag 201, 202 Packaged product F Contents

Claims (12)

A packaging bag made by sealing a laminated film so that a storage space for storing contents is formed inside,
The laminated film includes a front sheet and a back sheet facing the front sheet through the accommodation space,
Side seal portions formed on both left and right sides of the packaging bag by the front sheet and the back sheet as the seal portions of the laminated film,
An unsealing start structure is formed on the outer edge of at least one of the left and right side seal portions to trigger opening,
A first cut line that assists opening in the front sheet is formed so as not to contact the opening start structure,
A second cut line that assists opening in the back sheet is formed so as not to contact the opening start structure,
The first and second cut lines have a linear portion and a branched portion branched from at least one end thereof,
In each of the front sheet and the back sheet, a formation range of the opening start structure is located within a spread range of tips of the branched portions,
The position of the linear portion of the first cut line on the front sheet and the position of the linear portion of the second cut line on the back sheet are displaced in the vertical direction of the packaging bag, and the first and second A packaging bag characterized in that linear portions of cut lines are parallel to each other. 2. The package according to claim 1, wherein the tip of the branched portion of the first cut line on the front sheet and the tip of the branched portion of the second cut line on the back sheet are aligned. bag. 3. The method according to claim 2, wherein at the first and second cut lines, the branched portions have a V shape, and at least one of the branched portions has an asymmetrically deformed V shape. packaging bag. The unsealing start structure is formed on the outer edges of the left and right side seal portions, and the branched portions of the first and second cut lines are formed on both ends of the linear portion. The packaging bag according to any one of items 1 to 3. Any one of claims 1 to 4, wherein the position of the linear portion of the first cut line and the position of the linear portion of the second cut line have a deviation amount of 0.5 to 4 mm. The packaging bag according to item 1. The packaging bag according to any one of claims 1 to 5, wherein the laminated film comprises a substrate layer and a thermoplastic resin layer. 7. The packaging bag according to claim 6, further comprising at least one intermediate layer between said base material layer and said thermoplastic resin layer. 8. The packaging bag according to claim 7, wherein at least one of said first and second cut lines is provided on at least one of said base material layer and said intermediate layer. At least one of the base layer, the intermediate layer, and the thermoplastic resin layer has a straight cutting property that guides linear tearing from one side seal portion to the other side seal portion. 9. The packaging bag according to claim 7 or 8. A packaging bag made by sealing a laminated film so that a storage space for storing contents is formed inside,
The laminated film includes a front sheet and a back sheet facing the front sheet through the accommodation space,
Side seal portions formed on both left and right sides of the packaging bag by the front sheet and the back sheet as the seal portions of the laminated film,
An unsealing start structure is formed on the outer edge of at least one of the left and right side seal portions to trigger opening,
A first cut line that assists opening in the front sheet is formed so as not to contact the opening start structure,
A second cut line that assists opening in the back sheet is formed so as not to contact the opening start structure,
The first and second cut lines are composed of a V-shaped portion having a sideways V-shape,
the bent position of the V-shaped portion of the front sheet and the bent position of the V-shaped portion of the back sheet are displaced in the vertical direction of the packaging bag,
In each of the front sheet and the back sheet, a formation range of the opening start structure is located within a widening range of the tip of the V-shaped portion,
In each of the front sheet and the back sheet, at least one layer constituting the laminated film has straight cutting properties that guide linear tearing from one side seal portion to the other side seal portion. A packaging bag characterized by: A chuck member that enables resealing and re-opening is further provided between the front sheet and the back sheet, and the chuck member is positioned on the accommodation space side of the first and second cut lines. The packaging bag according to any one of claims 1 to 10. The packaging bag according to any one of claims 1 to 11, wherein the contents are hermetically packaged while being accommodated in the accommodation space.

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