JP4244302B2 - Easy-open packaging bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging bag having a barrier property for sealing contents and an easy opening property that does not require tools such as scissors and a cutter when opened.
[0002]
[Prior art]
Conventionally, a sealant film made of a thermoplastic resin and a base film made of a resin film are laminated, and if necessary, a sheet material sandwiched with aluminum foil or the like is shaped into a bag shape by heat-sealing the sealant films. Since the packaging bag is lightweight and rich in barrier properties and can be folded and made small when discarded, it is used for packaging various articles such as daily necessities such as detergents, foods, medicines, daily commodities.
[0003]
In particular, in recent years, there has been an increasing demand for easy-open packaging bags that can be easily opened with fingers without using tools such as scissors and cutters. Packaging that uses notches in the heat-sealed part and sheet material that is highly tearable. A bag has been proposed.
[0004]
For example, Patent Document 1 discloses a packaging bag in which a plurality of scars are formed in the heat-sealed portion, Patent Documents 2 and 3 include a packaging bag in which a part of the base film is roughened, and Patent Document 4 discloses a packaging bag. A packaging bag using a porous film as a material film is disclosed, and Patent Document 5 discloses a packaging bag in which a groove is formed in a base film by a laser.
[0005]
[Patent Document 1]
Japanese Patent No. 2731474 [Patent Document 2]
Japanese Patent No. 2703230 [Patent Document 3]
Japanese Patent No. 3348589 [Patent Document 4]
Japanese Patent No. 2716352 [Patent Document 5]
Japanese Patent No. 3306463 [0006]
[Problems to be solved by the invention]
A conventional easy-open packaging bag is formed by forming notches and a plurality of scratches for imparting easy-openability in the heat-sealed portion and the entire packaging bag. Since the heat-sealed part is substantially doubled in thickness and increased in strength, when a cut is formed from a notch or a flaw formed in the heat-fused part, it reaches a place where the cut is not heat-sealed. At this point, the contents rapidly advance, so that the contents are likely to jump out. In particular, when the contents are liquid, there is a problem that they are scattered around and contaminated. In addition, when the entire packaging bag is damaged, the barrier property of the packaging bag and the strength of the entire packaging bag are lowered.
[0007]
More recently, it has been demanded that the slits that form openings on the two surfaces of the opposite packaging material are linearly overlapped (linearity) so that the contents can be easily taken out. In the packaging bag, the cuts formed from the notches and scratches in the heat-sealed portion proceeded in different directions in the non-heat-sealed portion, and the end portions of the cut did not match.
[0008]
An object of the present invention is to provide an easy-opening property to a packaging bag without impairing barrier properties and strength, and in particular, to provide an easy-opening packaging bag that can be easily opened from a non-thermally fused part. . Furthermore, the subject of this invention is providing the easy-open packaging bag excellent in the linearity at the time of opening.
[0009]
[Means for Solving the Problems]
1st of this invention consists of a packaging material which has an extrusion resin layer formed by an extrusion lamination at least in contact with a base film between at least a base film and a sealant film, and provided the bending part of at least 1 side. It is a packaging bag formed into a bag shape, and the opening is sealed by heat sealing between sealant films,
In a direction perpendicular to the bent portion, a notch across the bent portion is provided on the base fill arm, the sealant film, beginning from the end corresponding region of the notches, broken lines cut portion along the extending direction of the notch Is an easy-open packaging bag characterized by being alternately formed on the sealant film and the base film .
2nd of this invention consists of a packaging material which has the extrusion resin layer formed by carrying out extrusion lamination in contact with a base film at least between a base film and a sealant film, and provided the bending part of at least 1 side. It is a packaging bag formed into a bag shape, and the opening is sealed by heat sealing between sealant films,
A notch straddling the bent portion is provided in both the base film and the sealant film in a direction perpendicular to the bent portion, and the notch of the base film is longer than the notch of the sealant film. The easy-open packaging bag is characterized in that a cut portion is formed along the extending direction of the notch starting from a portion corresponding to the end of the notch of the film.
3rd of this invention consists of a packaging material which has the extrusion resin layer formed by carrying out extrusion lamination in contact with a base film at least between a base film and a sealant film, and provided the bending part of at least 1 side. It is a packaging bag formed into a bag shape, and the opening is sealed by heat sealing between sealant films,
The base material of the sealant film is provided with a notch straddling the bent part in both the base film and the sealant film in a direction perpendicular to the bent part, and the notch of the base film is longer than the notch of the sealant film. It is an easy-open packaging bag characterized by starting with a portion corresponding to the end of the notch and having broken-line cut portions along the extending direction of the notch alternately formed in the sealant film and the base film.
4th of this invention consists of a packaging material which has an extrusion resin layer formed by an extrusion lamination at least in contact with a base film between at least a base film and a sealant film, and is provided with a bent portion of at least one side. It is a packaging bag formed into a bag shape, and the opening is sealed by heat sealing between sealant films,
In the direction orthogonal to the bent portion, a notch straddling the bent portion is provided in both the base film and the sealant film, and the notch of the sealant film is longer than the notch of the base film, and the sealant of the base film It is an easy-open packaging bag characterized by starting with a portion corresponding to the end of the notch of the film and having broken line cut portions along the extending direction of the notch alternately formed in the base film and the sealant film. .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The easy-open packaging bag of the present invention has a bent portion of at least one side, and has a notch in the base film or the base film and the sealant film of the bent portion. Therefore, by pulling up and down the notch around the notch in opposite directions, a cut can be easily formed in the packaging bag and opened.
[0011]
Furthermore, in this invention, it forms with a notch by forming a cut part in a sealant film along the extension direction of the said notch, or forming a broken line-shaped cut part in a sealant film and a base film alternately. The cut can be extended along the extension direction to easily widen the opening. In particular, by forming the cut portion up to the end opposite to the bent portion where the notch is formed, the cut is formed linearly from the notch, and the two cuts of the opposite packaging material are completely overlapped. The end parts match.
[0012]
In the packaging bag of the present invention, since it has an extruded resin layer formed by extrusion lamination to a base film, the extruded resin layer satisfactorily closes notches and cut portions, so that the barrier property and strength of the packaging material are good. Maintained.
[0013]
Below, the structure of this invention is demonstrated in detail.
[0014]
The easy-open packaging bag of the present invention has at least one bent portion, and the opening is sealed by heat sealing a sealant film. Therefore, examples of the form of the bag include a pillow packaging bag and a three-way packaging bag. An example thereof is schematically shown in FIG. FIG. 1 shows a package in which an article is housed and sealed in the packaging bag of the present invention, and the illustration of the article is omitted for convenience.
[0015]
1, (a-1) is a front view of a pillow packaging bag, (b-1) is a front view of a three-way packaging bag, and (a-2) is a cross-sectional schematic view taken along line AA ′ of (a-1). The figure, (b-2) is a BB 'cross-sectional schematic diagram of (b-1). In the figure, 1a is the front surface of the packaging bag, 1b is the back surface, 2a to 2d are heat-sealed portions, 3a and 3b are bent portions, and 4 is a notch portion. In (b-1) and (b-2), the two facing packaging materials are the front surface 1a and the rear surface 1b for the sake of convenience, but have substantially the same configuration.
[0016]
As shown in FIG. 1, in the case of a pillow packaging bag, the two inner sides parallel to the two end sides are bent as the bent portions 3a and 3b so that the two opposite ends of the rectangular packaging material are in contact with each other, The sides and the upper and lower openings are heat-sealed (heat-sealed portions 2a to 2c) to constitute the package. In the case of a three-sided packaging bag, the package is formed by folding at the center of the rectangular packaging material (bending portion 3a) and thermally fusing the overlapping three sides (heat-sealing portions 2a, 2b, 2d). .
[0017]
In this invention, the notch part 4 is formed in the bending part 3a of a packaging bag. In the case of a pillow packaging bag having two bent portions 3a and 3b, the effect of the present invention can be obtained if it is formed only on one bent portion 3a, but it may be provided at two locations 3a and 3b. . In this case, the notch portion formed in the bent portion 3b is formed on the extension line 5 of the notch portion 4 formed in the bent portion 3a, and cut portions 14, 15a, 15b described later are formed between the notches. It is desirable to keep it.
[0018]
FIG. 2 shows a schematic enlarged cross-sectional view of the vicinity of the notch portion 4 of the embodiment of the packaging bag of the present invention. The cross section is a cross section along the notch portion 4 and its extension line 5 in FIG. In the figure, 4a is a notch of a base film, 4b is a notch of a sealant film, 11 is a base film, 12 is an extruded resin layer, and 13 is a sealant film.
[0019]
As shown in FIG. 2, in the packaging bag of the present invention, the base film 11 or the base film 11 and the sealant film 13 are notched. 2A shows a configuration in which the notch 4a is provided only in the base film 11, and FIG. 2B shows a configuration in which the notches 4a and 4b are provided in both the base film 11 and the sealant film 13. The notches 4a and 4b are orthogonal to the bent portion 3a and are formed across the bent portion 3a. The length L ₁ (from the bent portion 3a to the end) is preferably 1.5 to 10 mm. If the length of the notch is less than 1.5 mm, the misalignment tends to occur when forming over the bent portion 3a, and the alignment becomes difficult. Moreover, since the intensity | strength of a packaging bag will fall when the length of a notch exceeds 10 mm, it is unpreferable. The lengths of the notches 4a and 4b may be different from each other.
[0020]
In FIG. 2, for clarity of arrangement, for convenience, are shown in a curved shape the bent portion 3a, the L ₁ is completely folded in the bent portion 3a of the packaging material, the front 1a and the back 1b Refers to the length in a state where the notches 4a and 4b are linear, and the thickness of the packaging material in the bent portion 3a can be substantially ignored.
[0021]
Furthermore, in the present invention, in addition to the notch portion 4 described above, a cut portion along the extension line 5 of the notch portion 4 is provided in the sealant film 13, or the base film 11 and the sealant film 13, An opening can be formed linearly from the notch 4. FIG. 3 and FIG. 4 show enlarged cross-sectional schematic diagrams along the notch portion 4 and the extension line 5 in the vicinity of the notch portion 4 in the embodiment. In the figure, reference numerals 14, 15a and 15b denote cutting parts, and the same parts as those in FIGS.
[0022]
FIG. 3A shows an example in which the notch 4a is formed in the base film 11, and the cut portion 14 along the extension line 5 is formed in the sealant film 13 from the portion corresponding to the end of the notch 4a. 3 (b), the notch 4a is formed in the base film 11, and the sealant film 13 has broken line-like cut portions 15b and 15a along the extension line 5 starting from a portion corresponding to the end of the notch 4a. And it is the example formed in the base film 11 alternately.
[0023]
In the configuration of FIG. 3B, the lengths L ₂ and L ₃ of the cut portions 15a and 15b are staggered so as to correspond to the lengths of the non-cut portions of the corresponding sealant film 13 and base film 11, respectively. Is arranged. Further, it is preferable that the length L ₂ of the cutting portion 15 a is equal to or longer than the length L ₃ of the cutting portion 15 b, and the deviation in the direction along the extension line 5 is less than or equal to the film thickness of the packaging material. The shift between the cut portion 15a and the cut portion 15b in the direction orthogonal to the line 5 is preferably equal to or less than the film thickness of the packaging material.
[0024]
FIG. 4 is a configuration example in which notches 4a and 4b are formed in the base film 11 and the sealant film 13, respectively.
[0025]
In FIG. 4A, the notch 4a of the base film 11 is longer than the notch 4b of the sealant film 13, and the sealant film 13 is cut along the extension line 5 from the portion corresponding to the end of the notch 4a of the base film 11. This is an example in which the portion 14 is formed.
[0026]
In FIG. 4B, the notch 4 a of the base film 11 is longer than the notch 4 b of the sealant film 13, and starts from a portion corresponding to the end of the notch 4 b of the base film 11 along the extension line 5. This is an example in which the broken line-shaped cut portions 15 b and 15 a are alternately formed on the sealant film 13 and the base film 11.
[0027]
Further, FIG. 4C shows that the notch 4a of the base film 11 is shorter than the notch 4b of the sealant film 13 and starts from a portion of the base film 11 corresponding to the end of the notch 4b of the sealant film 13. In this example, the fractured cut portions 15a and 15b are formed alternately on the base film 11 and the sealant film 13.
[0028]
In the configuration of FIG. 4, the lengths L _1a and L _1b of the notches 4a and 4b and the lengths L ₂ and L ₃ of the cutting portions 15a and 15b are the same as the configurations of FIGS.
[0029]
3 and 4, the cut portions 14, 15a and 15b may be terminated at any point of the extension line 5 as long as they are formed continuously from the notch portion 4, but the notch 4a is formed. The front surface 1a is formed by forming the edge opposite to the bent portion 3a, that is, until reaching the bent portion 3b in FIG. 1A-1 or the non-heat-bonded portion end 6 in FIG. And the cut | interval with the sufficient linearity which crosses a packaging bag along the extended line 5 can be formed in the back surface 1b. In addition, in order to keep intensity | strength in the heat-fusion part 2c of FIG. 1 (a-1), the said cutting parts 14, 15a, and 15b are not formed.
[0030]
The packaging material which comprises the packaging bag of this invention has an extrusion resin layer formed by extrusion-laminating a base film at least between a base film and a sealant film.
[0031]
As the base film constituting the packaging material according to the present invention, a resin film is used. Specifically, for example, a polyester film such as polyethylene terephthalate (PET), a polyolefin film such as stretched polypropylene (OPP), 6, 6 A polyamide film such as nylon or 6-nylon is preferably used, and the thickness is preferably 10 to 50 μm, more preferably 20 to 30 μm.
[0032]
Further, as the extruded resin layer to be extrusion laminated to the base film, a thermoplastic resin having excellent adhesion between the base film and the following sealant film or aluminum foil is used. For example, a low density polyethylene resin (LDPE) ), A linear low-density polyethylene resin (LLDPE), an ethylene / methacrylic acid copolymer (EMAA), or an ionomer resin obtained by partially crosslinking EMAA with metal ions. In particular, when an aluminum foil is used in the packaging material as described later, EMAA is preferably used. The thickness of the extruded resin layer is preferably 15 to 30 μm.
[0033]
Furthermore, for the sealant film used for heat-sealing the opening, a thermoplastic resin used in a general packaging bag is preferably used. For example, an LLDPE film or an unstretched polypropylene (CPP) film is preferably used. The preferred thickness is 20 to 50 μm.
[0034]
In the packaging material according to the present invention, another layer may be disposed on the inner side between the extruded resin layer and the sealant film. For example, light shielding properties and further barrier properties can be imparted by interposing an aluminum foil. In this case, the thickness of the aluminum foil is preferably 5 to 20 μm, and EMAA is preferably used as the extruded resin layer. Moreover, what is necessary is just to carry out extrusion lamination using the resin similar to the said extrusion resin layer, or dry-laminate using an adhesive agent for adhesion | attachment with an aluminum foil and a sealant film.
[0035]
Next, the manufacturing method of the packaging material concerning this invention is demonstrated.
[0036]
(1) Base film / extruded resin layer / sealant film {circle around (1)} Design printing is performed on the inner surface of the base film, and at the same time, the alignment mark of the notch is printed.
(2) Form notches and / or cut portions necessary for the base film.
(3) Notches and / or cut portions necessary for the sealant film are separately formed.
(4) The base film and the sealant film are extrusion laminated with a thermoplastic resin to form an extruded resin layer.
[0037]
(2) Base film / extruded resin layer A / aluminum foil / extruded resin layer B / sealant film (1) to (3) Same as (1) to (3) in the constitution of (1) above.
(4) 'The sealant film obtained in (3) above and an aluminum foil are extrusion laminated with a thermoplastic resin to form an extruded resin layer B.
(5) The base film and the laminate obtained in (4) above are extrusion laminated with a thermoplastic resin to form an extruded resin layer A.
[0038]
In this configuration, the extruded resin layer A is an essential extruded resin layer in the present invention, and the extruded resin layer B is selected from resin materials used for the extruded resin layer A. In this configuration, EMAA is preferably used for all.
[0039]
(3) Substrate film / extruded resin layer / aluminum foil / dry adhesive layer / sealant film {circle around (1)} to {circle around (3)} Same as the constitution {circle around (1)} to {circle around (3)} above.
(4) Dry laminate the sealant film obtained in (3) and aluminum foil.
(5) The base film and the laminate obtained in the above (4) are extrusion laminated with a thermoplastic resin to form an extruded resin layer.
[0040]
In each manufacturing method, when extrusion laminating a base film and a sealant film or a laminate of a sealant film and an aluminum foil, the alignment marks printed on the base film and the sealant film are read with a sensor, Align.
[0041]
The process of forming the packaging bag from the packaging material depends on the form of the packaging operation. For example, the packaging material is cut into a predetermined size, bent with the sealant film inside, and the opening is left with at least one of the sealant. Sealed by heat-sealing between the films to form a three-sided packaging bag or pillow packaging bag with an opening. The article is stored in the packaging bag through the opening, and the remaining opening is heat-sealed and sealed. And a package. Alternatively, the packaging material is formed in a long shape, and the article is stored while being folded with the sealant film inside, and a predetermined region is heat-sealed and simultaneously cut and separated into individual packages. That is, in the latter, the packaging bag of the present invention is formed simultaneously with the packaging of the article.
[0042]
Therefore, the easy-open packaging bag of the present invention includes both the state having an opening before packaging an article and the state of a package in which all openings after packaging an article are heat-sealed and sealed.
[0043]
【The invention's effect】
As described above, the easy-open packaging bag of the present invention has an extruded resin layer in contact with the base film, and a notch is formed in the folded portion, so that the original strength and barrier properties of the packaging bag are maintained. In addition, it can be easily opened with fingers. In particular, in the form in which the cut portion is formed up to the other end portion, the cuts following the notch are formed in a straight line. Therefore, according to the present invention, even an article containing a liquid component or a volatile component can be packaged satisfactorily.
[Brief description of the drawings]
FIG. 1 is a view showing an embodiment of an easy-open packaging bag of the present invention.
FIG. 2 is an enlarged schematic sectional view in the vicinity of the notch of the embodiment of the easy-open packaging bag of the present invention.
FIG. 3 is an enlarged schematic cross-sectional view in the vicinity of the notch of the embodiment of the easy-open packaging bag of the present invention.
FIG. 4 is an enlarged schematic sectional view in the vicinity of the notch of the embodiment of the easy-open packaging bag of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a Front 1b Back 2a-2d Thermal fusion | bond part 3a, 3b Bending part 4 Notch part 4a, 4b Notch 5 Extension line 6 of a notch part Non-thermal fusion part edge part 11 Base film 12 Extrusion resin layer 13 Sealant film 14, 15a, 15b cutting part

Claims (5)

It is made of a packaging material having an extruded resin layer formed by being laminated at least in contact with the base film and between the base film and the sealant film. It is a packaging bag that is sealed by heat sealing between sealant films,
A notch straddling the bent portion is provided in the base film in a direction perpendicular to the bent portion , and a broken line-shaped cut portion starting from a portion corresponding to the end of the notch of the sealant film and extending in the extending direction of the notch is provided. , easily openable packaging bag, characterized in that it is alternately formed with the sealant film and the base film. It is made of a packaging material having an extruded resin layer formed by being laminated at least in contact with the base film and between the base film and the sealant film. It is a packaging bag that is sealed by heat sealing between sealant films,
A notch straddling the bent portion is provided in both the base film and the sealant film in a direction perpendicular to the bent portion, and the notch of the base film is longer than the notch of the sealant film. An easy-open packaging bag , characterized in that a cut portion is formed along an extending direction of the notch, starting from a portion corresponding to the end of the notch of the film. It is made of a packaging material having an extruded resin layer formed by being laminated at least in contact with the base film and between the base film and the sealant film. It is a packaging bag that is sealed by heat sealing between sealant films,
The base material of the sealant film is provided with a notch straddling the bent part in both the base film and the sealant film in a direction perpendicular to the bent part, and the notch of the base film is longer than the notch of the sealant film. An easy-open packaging bag , characterized in that broken line-shaped cut portions starting from a portion corresponding to the end of the notch are formed alternately in the sealant film and the base film along the extending direction of the notch. It is made of a packaging material having an extruded resin layer formed by being laminated at least in contact with the base film and between the base film and the sealant film. It is a packaging bag that is sealed by heat sealing between sealant films,
In the direction orthogonal to the bent portion, a notch straddling the bent portion is provided in both the base film and the sealant film, and the notch of the sealant film is longer than the notch of the base film, and the sealant of the base film An easy-open packaging bag , characterized in that broken-line-shaped cut portions that start from a portion corresponding to the end of the notch of the film and extend along the extending direction of the notch are alternately formed on the base film and the sealant film. The easy-open packaging bag according to any one of claims 1 to 4 , wherein the cutting portion is formed until reaching an end side of the non-heat-sealed portion of the packaging bag that faces the bent portion.

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