JP2010202266A - Packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag wherein its opening can be widely opened while the packaging bag is held with small holding force without the need for a troublesome action when contents are taken out of the packaging bag again after opening, thereby eliminating the feeling of inconvenience when the contents are taken out. <P>SOLUTION: The packaging bag has a folded part 2 wherein a first valley fold, a first mountain fold, a second mountain fold and a second valley fold are sequentially provided in a film in a direction in which folding lines are in parallel with each other between the opening mouth 4 of the packaging bag and the central part of its opposite side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a packaging bag with improved convenience during use with respect to a packaging bag for powder and solid food, for example, a packaging bag provided with a re-sealable chuck at an opening.

Conventionally, various kinds of liquids, powders, solid and liquid mixtures, granular materials, etc. using soft packaging bags such as three-side seals, four-side seals, pillows, gusset pillows, tending pouches, and pouches with plugs. Flexible packaging bags are widely used. These soft packaging bag containers are excellent in compressibility and flexibility, but have poor shape retention as containers when the filled contents are reduced, and thus have various harmful effects. .
For this reason, for example, a soft packaging bag such as a plastic film pouch having a zipper or a bite made of a male bite and a female bite attached in the vicinity of the opening part is used for its preservability and opening. Because of its ease, it is used in many fields such as various foods, haptic agents, pharmaceuticals, detergents, and industrial chemicals (Patent Document 1).

  However, once the opening of the packaging bag is opened, it is usually left open and the contents may be exposed or spilled out. If the bag is provided with a chuck in the opening so that it can be resealed after being opened once, the opening will not be opened greatly even if it is left open after opening due to the elasticity of the chuck, but the contents are taken out again. In many cases, it was inconvenient to open a large opening.

In order to make the opening wide open only while holding it by holding it lightly without applying a troublesome operation when removing the contents again after opening, make the packaging bag material rigid. There is a method of constructing with a high film, but it results in unnecessarily wasting material and in many cases is not practical.
The expectation that there would be no inconvenience when taking out the contents if there is a packaging bag that opens wide as long as it is held as described above with ordinary materials and a simple method was provided with a chuck The bag was large because the opening was easy to close.

JP2007-10645

  The problem of the present invention is that it is not inconvenient when taking out the contents, because the opening opens wide only while holding it by lightly holding and applying force without requiring troublesome operations when taking out the contents again after opening. It is to provide a packaging bag that does not feel.

  The present invention has been made to solve the above problems, and the invention according to claim 1 is a packaging bag in which two films are overlapped and a peripheral edge portion is sealed, and the opening is opposed to the opening. The film has a folding portion in which a first valley fold, a first mountain fold, a second mountain fold, and a second valley fold are sequentially provided in a direction in which the fold line is parallel to the central portion of the side. This is a packaging bag.

In the invention according to claim 2 of the present invention, the distance between the first valley fold line and the first mountain fold line is W1, the distance between the first mountain fold line and the second mountain fold line is W2, and the first When the distance between the second mountain fold line and the second valley fold line is W3,
1 <W2 / (W1 + W3) ≦ 2
The packaging bag according to claim 1, wherein

  The invention according to claim 3 of the present invention is the packaging bag according to claim 1 or 2, wherein a chuck is provided between the opening and the folding portion.

  According to the packaging bag of the invention of claim 1, the packaging bag is formed by laminating two films and sealing the peripheral edge portion, and a fold line is formed between the opening and the central portion of the opposite side. When taking out the contents again after opening by having a fold portion in which the first valley fold, the first mountain fold, the second mountain fold, and the second valley fold are sequentially provided in the film in a parallel direction. It is now possible to hold the opening largely by holding the side seal portions at both ends of the folded portion lightly by hand.

  By providing a folded portion in the film so that the film partially overlaps, a striped region having rigidity greater than that of the surrounding film is created at the periphery of the packaging bag near the opening, and the stripe-shaped region is formed. By applying light force from both ends, the folding portion is folded, and the film around the opening is opened accordingly.

  Fold the shape of the fold into a film (the convex side of the packaging bag is convex) and the valley fold (the convex side of the packaging bag is convex), the first valley fold, the first mountain fold, the second mountain fold, the second valley fold By providing sequentially, when the folding part is formed on the outside and a force is applied from both ends of the folding part, the folding part can be folded in a direction protruding to the outside of the packaging bag, and the opening can be opened largely. .

According to the packaging bag of the invention of claim 2, the distance between the first valley fold line and the first mountain fold line is W1, and the distance between the first mountain fold line and the second mountain fold line is W2. When the distance between the second mountain fold line and the second valley fold line is W3,
1 <W2 / (W1 + W3) ≦ 2
As a result, it is possible to securely hold the opening portion by holding the folded portion lightly by hand.

When the cross section of the folded portion is represented by a substantially trapezoidal shape, W1 and W3 represent the lengths of both legs, and W2 represents the length of the lower part. If W2 / (W1 + W3) is less than 1, both legs will overlap in the folded state, the film thickness of that part will be unnecessarily thick and inconvenient to handle, as well as poor sealing at the side seal part Is likely to occur.
On the other hand, when W2 / (W1 + W3) exceeds 2, the effect of the stripe-like region having high rigidity is diminished by increasing the length of the lower portion.

  According to the packaging bag of the invention of claim 3, since the chuck is provided between the opening and the folding portion, the bag provided with the chuck is particularly large because the opening is easy to close, so it is held lightly by hand. Thus, the effect of the packaging bag of the present invention that can be easily opened again can be remarkably realized.

  As described above, according to the packaging bag of the present invention, when the contents are taken out again after opening, the opening can be largely held by lightly holding the third seal portions at both ends of the folded portion by hand. .

Schematic diagram of an example of the packaging bag of the present invention (A) Front schematic diagram (B) Schematic cross-sectional view at the Z-Z 'line Partial enlarged view of an example of the packaging bag of the present invention The conceptual diagram at the time of use after opening of an example of the packaging bag of this invention Cross-sectional schematic diagram showing an example of a laminated film constituting the packaging bag of the present invention Sectional schematic diagram which shows an example of the intermediate | middle layer film which comprises the packaging bag of this invention

Next, an embodiment of the packaging bag of the present invention will be described with reference to the drawings as necessary.
FIG. 1 is a conceptual diagram of an example of a packaging bag according to the present invention, in which (A) is a schematic front view, and (B) is a schematic cross-sectional view taken along line ZZ ′ of (A). FIG. 2 is a partially enlarged view of an example of the packaging bag of the present invention. FIG. 3 is a conceptual diagram of an example of the packaging bag of the present invention when used after opening. FIG. 4 is a schematic cross-sectional view showing an example of a laminated film constituting the packaging bag of the present invention. FIG. 5 is a schematic cross-sectional view showing an example of the intermediate layer film constituting the packaging bag of the present invention.

FIG. 1 is a conceptual diagram of an example of a packaging bag of the present invention formed by stacking two films and sealing the peripheral edge. The packaging bag (1) is overlapped with two front and back films and heat-sealed with a side seal (5) and bottom seal (6), and is opened at the side seal near the upper opening (4). A notch (7) that triggers for cutting, a cut line (8) provided between the notches by laser half-cut and the like, and a chuck (3) for resealing after opening on the inner side of the packaging bag below the notch Is provided.
The folding part (2), which is a feature of the present invention, is provided in the film on the bottom seal (6) side in the vicinity of the chuck (3) in parallel with the upper edge of the opening (4).

FIG. 2 is a partially enlarged view of FIG. 1 (B), showing in more detail the vicinity of the folding portion (2) provided at an appropriate position below the chuck (3) at the top of the packaging bag.
In FIG. 2, the folding part (2) is a first valley fold (A), a first mountain fold (B) from the side close to the opening (4) to the outside on one side of the film forming the packaging bag, The second mountain fold (C) and the second valley fold (D) are formed in this order, and the distance between the first valley fold (A) and the first mountain fold (B) is W1, The distance between the first mountain fold (B) and the second mountain fold (C) is W2, and the distance between the second mountain fold (C) and the second valley fold (D) is indicated by W3. Has been.
In the packaging bag of the present invention, since 1 <W2 / (W1 + W3) ≦ 2, it is possible to reliably hold a large opening by holding the folded portion lightly by hand.

  The conceptual diagram at the time of use after opening of an example of the packaging bag of this invention was shown in FIG. When the contents are taken out after opening the packaging bag, the side seal portions at both ends of the folded portion (2) of the packaging bag are shown by dotted lines from the state where the opening is almost closed due to the rigidity of the chuck (3). When the button is lightly pressed, the opening (4) opens again, and the contents such as powder and solid food can be easily and easily taken out.

  A chuck having a polyolefin film used for the innermost layer portion of the package and a heat-weldable tape is mounted near the planned opening portion of the upper portion of the packaging bag.

  When removing the contents from the package, after opening from the notch (7) along the cut line (8), the chuck (3) consisting of the engagement protrusion and the engagement recess is opened, and the contents are removed. Take out. After the necessary amount is taken out, the engagement protrusion and the engagement recess of the chuck (3) can be fitted again and resealed.

  Although there is no special restriction | limiting about the material of the film used for the packaging bag of this invention, It is important to select the material structure suitable for use conditions suitably. For example, an inorganic compound-deposited polyethylene in which an inorganic oxide such as aluminum oxide or silicon oxide is laminated to a thickness of about 20 to 100 nm by physical vapor deposition or chemical vapor deposition on a uniaxially or biaxially stretched polyethylene terephthalate film as a main body film A laminated film obtained by laminating a terephthalate film, a nylon film excellent in tearability, and an unstretched polypropylene film or a polyethylene film having heat sealability can be suitably used. Further, as the material configuration of the chuck, a chuck molded from polypropylene resin or polyethylene resin is suitable.

  As the laminated film, it is possible to use a laminated film that has a barrier property comparable to that of an aluminum foil and is suitable for heating in a microwave oven, and that can be easily inspected by a metal detector.

As such a laminated film, for example, on at least one side of a base material made of a plastic material, a general formula R′Si (OR) ₃ (R ′: an alkyl group, a vinyl group, a glycidoxypropyl group, etc., R: an alkyl group) Etc.) are sequentially laminated with a primer layer composed of a trifunctional organosilane or a hydrolyzate of the organosilane, a composite of acrylic polyol and an isocyanate compound, and a deposited thin film layer composed of an inorganic oxide having a thickness of 5 to 300 nm. And a laminated film including a gas barrier laminated film layer and a sealant layer.

An example of the material configuration of the packaging bag of the present invention will be described with reference to FIGS.
The cross-sectional schematic diagram was shown as an example of the film used for the packaging bag of this invention in FIG. 4 as a laminated film (100). Of these, the printed layer (113), the intermediate layer (122) and, in some cases, the adhesive layers (114) and (115) are not necessarily required as the constituent elements of the laminated film used in the packaging bag of the present invention, but the description is simplified. It is shown in the figure for conversion. Moreover, in the structure which does not require an intermediate | middle layer (122), the outer side base material (112) itself of FIG. 4 may become a structure which uses the gas barrier laminated film of FIG.

  The material of the film of the outer base material (112) used for the laminated film (100) of the packaging bag of the present invention is not limited to these, and the material of the outermost base material layer is used as a packaging material. If it is, it can be used. For example, polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyolefins such as polyethylene (PE) and polypropylene (PP), polyamides such as nylon-6 and nylon-66 (PA ), Polycarbonate (PC), polyacrylonitrile (PAN), polyimide (PI), polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), ethylene-bunyl alcohol copolymer (EVOH) and the like, Nylon-6 / metaxylylenediamine nylon 6 co-extruded film, polypropylene / ethylene-vinyl alcohol copolymer co-extruded film, or a laminate of two or more of these films A If the film may be.

  As a method of laminating each film, for example, a known method such as a dry lamination method, a non-solvent dry lamination method, an extrusion lamination method, and a sandwich lamination method using the extrusion lamination method can be used.

For example, known additives such as an antistatic agent, an ultraviolet absorber, a plasticizer, a lubricant, and a colorant can be added to the outer substrate (112), and they are appropriately added as necessary.
Furthermore, the surface of the outer base material can be subjected to surface modification such as corona discharge treatment or anchor coating treatment to improve the adhesion with the sealant layer or the like. Moreover, a printing layer can be formed in the surface or back surface of a base film layer as needed.
The thickness of the outer substrate (112) is not particularly limited, but is preferably in the range of 10 μm to 300 μm from the viewpoint of workability and physical properties.

As the printing layer (113) used for the laminated film (100) of the packaging bag of the present invention, a known ink such as urethane or vinyl acetate can be used, and a known method such as gravure printing is used as the printing method. .
Furthermore, light-shielding printing can also be performed for the purpose of preventing deterioration of the package contents due to light rays. The shading printing can be carried out, for example, by a method in which a single layer or a plurality of layers of normal ink such as normal black ink and white ink, or white ink added with a small amount of color are stacked.

  As the adhesive layers (114) and (115) used for the laminated film (100) of the packaging bag of the present invention, an adhesive such as a two-component curable urethane resin used in a known method such as a dry laminating method is used. I can do it.

  In the packaging bag of the present invention, for example, when it is necessary to improve the drop strength, puncture strength, and gas barrier properties of the packaging bag, polyamide, polyethylene terephthalate, linear cut property between the outer base material and the sealant layer. An intermediate layer such as barrier nylon having As a forming method, lamination can be performed by a known method such as a dry laminating method in which an adhesive such as a two-component curable urethane resin is used.

  As an intermediate layer (122) used for the laminated film (100) of the packaging bag of the present invention, a thin film of an inorganic compound such as aluminum oxide or silicon oxide is physically vapor-deposited in order to improve the gas barrier property of the laminated film like an aluminum foil. Or the inorganic compound vapor deposition plastic film provided in the film thickness of about 20-100 nm by vapor deposition methods, such as chemical vapor deposition, can also be used.

  Of course, an aluminum foil may be used as the intermediate layer (122). However, depending on the thickness, there is a possibility that the opening and closing of the packaging bag may be hindered.

  As an example, as shown in FIG. 5, the gas barrier laminate film (121) used as the intermediate layer (122) has at least one surface of the gas barrier laminate base material (117) made of a plastic material on the outer surface of the packaging bag. In addition, a transparent primer layer (118), a vapor-deposited thin film layer (119) made of an inorganic oxide, and a gas barrier coating layer (120) are sequentially laminated.

  The gas barrier laminate base material (117) described above is a plastic material, and a transparent film is preferable in the case of using the transparency of the deposited thin film layer. For example, polyethylene terephthalate (PET), polyester film such as polyethylene naphthalate, polyolefin film such as polyethylene and polypropylene, polystyrene film, polyamide film, polyvinyl chloride film, polycarbonate film, polyacrylonitrile film, polyimide film, etc. are used. Either stretched or unstretched, and those having mechanical strength and dimensional stability are preferred. These are processed into a film and used. In particular, polyethylene terephthalate arbitrarily stretched in the biaxial direction is preferably used.

  Various well-known additives and stabilizers such as an antistatic agent, an ultraviolet ray preventing agent, a plasticizer, and a lubricant may be used on the surface of the gas barrier laminate base material (117). In order to improve the properties, corona treatment, low-temperature plasma treatment, ion bombardment treatment may be performed as pretreatment, and further chemical treatment, solvent treatment, and the like may be performed.

  The thickness of the gas barrier laminate base material (117) is not particularly limited, but suitability as a packaging material, that other layers may be laminated, vapor deposition comprising a primer layer (118) and an inorganic oxide. Considering the workability when forming the thin film layer (119) and the gas barrier coating layer (120), it is practically in the range of 3 to 200 μm and preferably 6 to 30 μm depending on the application.

  The primer layer (118) is provided on the gas barrier laminate substrate (117) made of a plastic material, and the adhesion between the gas barrier laminate substrate (117) and the deposited thin film layer (119) made of an inorganic oxide. The purpose is to prevent the occurrence of delamination.

  The thickness of the primer layer (118) is not particularly limited as long as a uniform coating film can be formed, but is generally preferably in the range of 0.01 to 2 μm. When the thickness is less than 0.01 μm, it is difficult to obtain a uniform coating film, and the adhesion may be lowered. On the other hand, when the thickness exceeds 2 μm, the coating film cannot be kept flexible because it is thick, and the coating film may be cracked due to external factors, which is not preferable. Particularly preferred is a range of 0.05 to 0.5 μm.

  As a method for forming the primer layer (118), for example, a known printing method such as an offset printing method, a gravure printing method, a silk screen printing method, or a known coating method such as a roll coat, a knife edge coat, or a gravure coat is used. Can do. About drying conditions, generally used conditions may be used.

  The vapor-deposited thin film layer (119) made of an inorganic oxide is made of a vapor-deposited film of an inorganic oxide such as aluminum oxide, silicon oxide, tin oxide, magnesium oxide, or a mixture thereof, and has transparency and oxygen, water vapor, etc. Any gas barrier property may be used. Among these, aluminum oxide and silicon oxide are particularly preferable.

  The optimum thickness of the vapor-deposited thin film layer (119) varies depending on the type and configuration of the inorganic compound to be used, but generally it is preferably in the range of 5 to 300 nm, and the value is appropriately selected. However, if the film thickness is less than 5 nm, a uniform film may not be obtained or the film thickness may not be sufficient, and the function as a gas barrier material may not be sufficiently achieved. On the other hand, when the film thickness exceeds 300 nm, flexibility cannot be maintained in the thin film, and the thin film may be cracked due to external factors such as bending and pulling after the film formation. The thickness of the deposited thin film layer (119) is preferably in the range of 10 to 150 nm.

  There are various methods for forming the deposited thin film layer (119) made of an inorganic oxide on the primer layer (118), and it can be formed by a normal vacuum deposition method. An ion plating method, a plasma vapor deposition method (CVD), or the like can also be used.

  However, considering productivity, the vacuum deposition method is the best at present. As the heating means of the vacuum deposition apparatus by the vacuum deposition method, an electron beam heating method, a resistance heating method, or an induction heating method is preferable. In order to improve the adhesion between the thin film and the base material and the denseness of the thin film, a plasma assist method or an ion It is also possible to use a beam assist method. In addition, in order to increase the transparency of the deposited film, it is possible to carry out reactive deposition by blowing oxygen gas or the like during deposition.

  The gas barrier coating layer (120) is provided on the vapor-deposited thin film layer (119) made of an inorganic oxide in order to provide a gas barrier property as high as that of an aluminum foil depending on the required quality.

  The gas barrier coating layer (120) is mainly composed of an aqueous solution or a water / alcohol mixed solution containing at least one of a water-soluble polymer and (a) one or more metal alkoxides and hydrolysates or (b) tin chloride. The coating agent is used. Mineralize a solution in which water-soluble polymer and tin chloride are dissolved in an aqueous (water or water / alcohol mixed) solvent, or a solution in which metal alkoxide is directly or hydrolyzed beforehand. The deposited thin film layer (119) made of oxide is formed by coating and heating and drying.

  Each of the above components can be added to the coating agent alone or in combination, and further, an isocyanate compound, a silane coupling agent, or a dispersant, stabilizer, viscosity adjustment, as long as the gas barrier properties of the coating agent are not impaired. Known additives such as coloring agents and coloring agents can be added.

  For example, the isocyanate compound added to the coating agent has two or more isocyanate groups (NCO groups) in the molecule, and monomers such as tolylene diisocyanate, triphenylmethane triisocyanate, tetramethylxylene diisocyanate, etc. And polymers and derivatives thereof.

  As a method for applying the coating agent, conventionally known means such as a dipping method, a roll coating method, a screen printing method, a spray method and the like that are usually used can be used. The thickness of the coating varies depending on the type of coating agent and the processing conditions, but it is sufficient that the thickness after drying is 0.01 μm or more. However, if the thickness exceeds 50 μm, cracks are likely to occur in the film. The range of 01-50 micrometers is preferable.

  The sealant layer (123) used for the laminated film (100) in the packaging bag of the present invention is provided as an adhesive layer when forming the packaging bag. Any resin can be used as long as it is heat-fusible. For example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-methacrylic acid copolymer, ethylene-methacrylic acid ester copolymer, ethylene-acrylic acid copolymer. Resins such as polymers, ethylene-acrylic acid ester copolymers, and metal cross-linked products thereof are used. In consideration of retort sterilization suitability in food packaging, polypropylene resin is more preferable, and linear low density polyethylene resin is more preferably used from the viewpoint of process suitability.

  The thickness is determined according to the purpose, but is generally in the range of 15 to 200 μm. As a forming method, it is common to use a dry laminating method or the like in which a film-like material made of the above resin is bonded using an adhesive such as a two-component curable urethane resin. be able to.

Specific examples of the present invention will be described below.
<Example 1>

  In order from the outermost layer, an aluminum oxide (alumina) -deposited biaxially stretched polyethylene terephthalate film (alumina-deposited OPET) having a thickness of 12 μm, a biaxially stretched nylon film (ONy) having a thickness of 15 μm, and an unstretched polypropylene film having a thickness of 70 μm ( CPP) was laminated by dry lamination using a polyurethane-based adhesive to form a roll-shaped laminated film.

  This roll of laminated film is attached to a bag making machine, the laminated films are overlapped with the CPP layer inside, a chuck is attached to the planned opening portion side, and a folded portion is placed on the non-opening scheduled portion side 10 mm from the chuck position. A packaging bag (three-sided pouch) having an outer dimension of 100 mm wide and 150 mm high was prepared. The positions and dimensions of the folded portions are represented by reference numerals in FIG. 2. The position of A is 10 mm from the position of the chuck, W1 and W3 are 4 mm, and W2 is 10 mm. The packaging bag was filled with 90 g of granular confectionery and sealed to prepare a package.

  The package is opened from the notch of the planned opening along the cut line, the chuck is opened, a part of the contents is taken out, left on the desk and then lifted by gently holding the side of the packaging bag by hand. The opening for taking out the contents easily opened and the granular confectionery could be taken out easily. When this packaging bag was placed on a desk and placed, the opening was naturally restored to a nearly closed state, and the granular confectionery did not spill out.

  As a result, the packaging bag of the present invention can hold the third seal part at both ends of the folding part lightly by hand when taking out the contents again after opening, so that the opening part can be kept large and convenient for use. I was able to improve the nature.

  The packaging bag of the present invention can hold the folded portion lightly by hand with respect to the bag for packaging the granular material and solid food, and can hold the opening greatly, and the contents can be smoothly taken out from the hand. It can be used as an easy-to-handle packaging bag that does not spill greatly when released.

DESCRIPTION OF SYMBOLS 1 ... Packaging bag 2 ... Folding part 3 ... Chuck 4 ... Opening opening 5 ... Side seal 6 ... Bottom seal 7 ... Notch 8 ... Cut line A ... 1st valley fold line B ... 1st mountain fold line C ... 2nd Mountain fold line D ... Second valley fold line W1 ... Distance W2 between first valley fold line and first mountain fold line ... Distance W3 between first mountain fold line and second mountain fold line ... Distance between second fold line and second valley fold line 100 ... laminated film 112 ... outer base material 113 ... printed layer 114 ... adhesive layer 115 ... adhesive layer 117 ... gas barrier laminate base material 118 ... primer layer 119: Inorganic oxide vapor-deposited thin film layer 120 ... Gas barrier film layer 121 ... Gas barrier laminated film 122 ... Intermediate layer 123 ... Sealant layer

Claims (3)

  A packaging bag in which two films are overlapped and the peripheral edge is sealed, and the film is folded in a first valley fold in a direction in which the fold line is parallel between the opening and the center of the opposite side. A packaging bag comprising a folding portion in which a first mountain fold, a second mountain fold, and a second valley fold are sequentially provided. The distance between the first valley fold line and the first mountain fold line is W1, the distance between the first mountain fold line and the second mountain fold line is W2, and the second mountain fold line and the second valley fold line are When the distance from the line is W3,
1 <W2 / (W1 + W3) ≦ 2
The packaging bag according to claim 1, wherein   The packaging bag according to claim 1 or 2, wherein a chuck is provided between the opening and the folding portion.

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