JP5790125B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag, and more particularly to a packaging bag suitable for opening from a sealed state containing powdery and granular materials.

  There are various forms of packaging bags suitable for storing not only foods such as instant coffee powder and sugar, but also powders and granules including beads. For example, it is a pillow-shaped sticker that has a sticker that is backed in the longitudinal direction on the back and is sealed at the upper end and lower end, and the three sides of the side edge, upper end, and lower end are sealed. The ones that have been sealed and the four sides are sealed.

  In order to take out the contents from these packaging bags, they are opened by tearing by hand in the width direction of the packaging bag at a position slightly closer to the center side than the seal portion at one end (upper end) thereof. At this time, if there are contents such as powder or granules in the vicinity of the opening, the contents (powder etc.) may dance or spill when opened.

  In particular, in a packaging bag having a back seal portion, the back seal portion is thick, so that it is difficult to tear and the cutting stops here, so that the contents are easily scattered. In order to solve this problem, in the packaging bag described in Patent Document 1, a seal portion corresponding to the back seal portion is provided at the position of the side edge of the packaging bag, and a cut is made there.

Japanese Utility Model Publication No. 58-174481

  However, as long as the contents (powder and granular materials) exist in the vicinity of the opening, it is inevitable that these contents will scatter when opened. This is a problem that the packaging bag in any form of a back seal, a three-side seal, and a four-side seal has in the same way.

  It is an object of the present invention to provide a packaging bag that can prevent the contents from scattering when opened.

  This invention is the same as the film itself on both the front and back sides of the packaging bag in which the opening for filling the contents is sealed after the contents are filled, at the position where the opening is opened from the sealed portion toward the center. The parts are molded in the width direction of the packaging bag by embossing so that the inner surfaces thereof become unevenness close to each other (the part that is molded is called an embossed part). The term “seal” means that it is sealed regardless of the method such as welding or adhesion.

  According to the present invention, the packaging bags are arranged in this order from the one end portion toward the center portion in the order of the seal portion, the opening location, and the embossed portion. The unsealed part is an area for opening the mouth of the packaging bag by an action such as tearing the packaging bag by hand or cutting it with scissors, etc., and may or may not be clearly stated on the surface. The film at the opening location may be easily tearable, or a notch (cut) may be formed at the side edge of the packaging bag at the opening location. In short, it is sufficient that an area for opening is present.

  According to the present invention, the embossed portion is provided between the center portion of the packaging bag and the opening location at one end portion, preferably at a position close to the opening location. The embossed part is formed by forming a concave part and a convex part in the front side film and the rear side film of the packaging bag so that they are fitted to each other by deformation of the film itself. Therefore, the contents (powdered body, granular body) filled in the packaging bag and present in the packaging bag from the other end portion to the central portion are prevented from entering the opening location beyond the embossed portion. In other words, it can be said that there is no content at the opening location. For this reason, even when the opening location is torn and opened, the contents such as powder and granules are not scattered.

  In other words, the embossed part is deformed into irregularities in which the inner surface of the front-side film and the inner surface of the back-side film constituting the packaging bag are fitted to each other so that the contents cannot enter the unsealed portion side through the gaps. Is formed. Most preferably, the inner surface of the front-side film and the inner surface of the back-side film are in contact with each other, but it is sufficient that the contents cannot pass even if there is a slight gap. This is called that the uneven surfaces are close to each other.

  The embossed portion is provided in the width direction of the packaging bag (the direction perpendicular to the direction from the center portion toward the opening location). Even if it is not provided continuously over the entire width of the packaging bag, it is sufficient that the contents do not pass therethrough, so there may be a portion where the emboss is not formed at one or a plurality of locations.

  In the embossed portion, the front side film and the back side film constituting the packaging bag are not bonded. Therefore, by pressing the packaging bag with one hand in the width direction, the uneven surfaces that are close to each other will be opened and the mouth will be opened, so that the contents will be guided through the embossed part and taken out (pour). Can do. Also, the embossed part is difficult to pass through the contents, so it has the role of a temporary seal.

  The unevenness of the front and back side films forming the embossed part is not limited to one, and there may be two or more. As the number of irregularities increases, the function as a barrier for the contents to enter the open area is enhanced.

  The present invention can be applied to all types of packaging bags such as pillow-type bags having a back seal, three-side seal or four-side seal packaging bags, gusset type packaging bags, etc. Needless to say, the present invention can also be applied to a wide width or a shape other than a rectangular shape.

It is a top view which shows the packaging bag of a three-way seal form. It is an expanded sectional view which follows the II-II line of FIG. It is an expanded sectional view equivalent to FIG. 2 which shows a modification. It is an expanded sectional view equivalent to FIG. 2 which shows a modification. It is a top view which shows the pillow-shaped packaging bag which has a back seal part. It is an expanded sectional view which follows the VI-VI line of FIG. It is a top view which shows the packaging bag of a four-way seal form. It is a top view which shows the modification of an embossing part. It is a top view which shows the other modification of an embossing part. It is a top view which shows the other modification of an embossing part. It is a top view which shows the other modification of an embossing part. It is a top view which shows the other modification of an embossing part. It is a top view which shows the other modification of an embossing part. It is a top view which shows the other modification of an embossing part.

  The packaging bag is formed by folding and sealing a laminated film mainly composed of plastic as will be described in detail later.

  FIG. 1 shows a first embodiment, which is a packaging bag in the form of a three-way seal.

  The packaging bag 10A is a long and narrow stick, and it is sealed by folding one film on one side 14 and sealing the other side (seal part 13) and sealing the upper and lower ends (seal parts 11 and 12). It is formed in a shape. In the packaging bag 10A (especially in a range between an embossed portion 22 and a lower end seal portion 12 described later), contents (powder, granular material, etc.) are contained. Throughout all the drawings, the seal is indicated by cross hatching. The seal portion is formed by film welding or adhesion using an adhesive.

  As will be described later, one film is folded at a side edge 14 to form a seal portion 13 at the other side, a seal portion 12 at the lower end is formed into a bag shape, and the contents are filled from the opening at the upper end. . Thereafter, the upper end is sealed (seal part 11), and the embossed part 22 is formed.

  The embossed portion 22 is formed at a position closer to the center than the unsealed portion 21 with the region of the unsealed portion 21 from the seal portion 11 at the upper end toward the central portion of the packaging bag 10A. The embossed portion 22 is formed over the entire width of the packaging bag 10A. That is, in the vicinity of the upper end portion of the packaging bag 10A, the seal portion 11, the opening location 21, and the embossed portion 22 are formed in this order from the upper end toward the center portion.

  The packaging bag 10A is formed of a single film, but in the form of the packaging bag 10A, it can be considered that the packaging bag 10A is composed of both front and back films. For convenience of explanation, the terms front side film and back side film are used. Used (indicated by reference numerals 18 and 19 in FIGS. 2 to 4, respectively).

  The unsealed portion 21 is a region indicated by a chain line. The film portion in the region of the opening location 21 may be the same as the film portion in other regions, or only this region 21 may have a structure that facilitates tearing. In this embodiment, the unsealed part 21 is simply printed on the front and back side films to indicate that it is an unsealed part (a color is different, an area is surrounded by a frame, etc.). In addition, a triangular mark 21a is printed on the unsealed portion 21 on the side edge 14 side to indicate that it should be torn from here. The same mark 21a may be printed on the back film.

  As shown in an enlarged view in FIG. 2, the films 18 and 19 on the front and back sides are bonded (including welding) at the seal portion 11 (the bonded portion is indicated by a particularly thick line). At the opening 21 and in the vicinity thereof, the films 18 and 19 on the front and back sides are separated or in contact with each other (particularly exaggerated).

  In the embossed portion 22, the inner surface of the film 18 on the front surface side is smoothly concavely recessed, and the inner surface of the film 19 on the rear surface side is smoothly projected in a convex shape, and the concave portion and the convex portion are fitted. The inner surfaces are almost in contact with each other (there may be some distances or a slight separation as a whole. In short, the inner surfaces are so close that the contents cannot pass therethrough. , As long as it is a barrier to the passage of contents.) In FIG. 2, the unevenness of the embossed portion 22 is drawn slightly exaggerated. As a guide, the height (depth) of the unevenness is about the total thickness of the films 18 and 19 on both front and back sides (may be 2 to 3 times), and the width of the embossed part 22 is 10 of the films 18 and 19 on both sides. Around double.

  In FIG. 2, the embossed portion 22 is formed by one smooth unevenness in the cross section, but two unevenness may be continuous as shown in FIG. 3. That is, a concave portion and a convex portion are formed on the inner surface of the front surface side film 18, and a convex portion and a concave portion that fit into the concave portion and the convex portion are formed in the width direction of the embossed portion 22 on the inner surface of the rear surface side film 19.

  Moreover, as shown in FIG. 4, the unevenness | corrugation of the embossed part 22 may be a little angular.

  The embossed portion 22 can be formed by embossing by applying pressure by sandwiching the films 18 and 19 on both front and back sides with a mold (including a mold, a roller, and the like). If necessary, it can be heated, but the films 18 and 19 should not be bonded. Many packaging materials can be molded, but it is particularly preferable to use a film that is easy to mold, such as a film having an aluminum layer.

  5 and 6 show a pillow-shaped packaging bag 10B having a back seal portion. One film is sealed in the longitudinal direction on the back side (back seal portion 15). The upper and lower ends of the packaging bag 10B are also sealed (seal portions 11 and 12). An opening 21 and an embossed portion 22 are provided in the vicinity of the upper end portion of the packaging bag 10B from the seal portion 11 at the upper end toward the central portion of the packaging bag 10B. Other configurations are the same as those of the embodiment shown in FIG.

  FIG. 7 shows a packaging bag 10C in the form of a four-way seal. The packaging bag 10C is formed from a single film, and after folding at the side edge in the same manner as the packaging bag 10A, the upper end, the lower end, and the left and right sides are respectively sealed (seal portions 11, 12, 16, 13). Also in the packaging bag 10C, in the vicinity of the upper end portion of the packaging bag 10C, the upper end seal portion 11, the opening location 21, and the embossed portion 22 are provided in this order from the upper end toward the center portion. In the opening location 21, a notch 21b is formed in a part of the left seal portion 16 to facilitate opening. In the above description, the packaging bag 10C is formed from one film, but may be formed from two films.

  In addition to the above, there are various forms of packaging bags such as gusset types (with gussets) and those having a bottom, and the present invention can be applied to all forms of packaging bags.

  8 to 14 show modified examples of the embossed portion. All of these show only the upper half of the packaging bag. The same components as those already described are denoted by the same reference numerals to avoid redundant description. All packaging bags are denoted by the reference numeral 10.

  In FIG. 8, the embossed portion 22 </ b> A is formed so as to draw a wave pattern in the width direction of the packaging bag 10.

  In FIG. 9, the embossed portion 22B is formed to draw an arc. In FIG. 9, the projection of the arc faces the upper end, but it may be reversed.

  In FIG. 10, the embossed portion 22C draws a straight line in the width direction of the packaging bag 10, and is formed obliquely only at the side portion.

  In FIG. 11, the embossed portion 22 </ b> D is formed obliquely with respect to the width direction of the packaging bag 10.

  In the case of a packaging bag (for example, a pillow-shaped packaging bag) that does not have a seal portion at the side edge, the film folding (folding) portion at the side edge tends to open due to the repulsion of the front and back films. Embossing at an angle with respect to the film folding part can provide a fitting force that is not defeated by the repulsion of the front and back films, rather than embossing perpendicularly. Can be made difficult to come off. The embossed portion may be a curved line or a straight line as long as it is oblique to the film bent portion. 8, 9, and 11 are suitable for a pillow-shaped packaging bag having no seals on both sides. FIG. 10 is suitable for a three-side sealed packaging bag having no seal on one side edge.

  In all the above embodiments, the embossed portion is provided over the entire width of the packaging bag. However, in FIG. 12, a plurality of embossed portions 22E are provided side by side in the width direction of the packaging bag 10. ing. The interval between the adjacent embossed portions 22 may be such that the contents (powdered body, granular body) cannot pass through. In FIG. 13, both ends of each embossed portion 22F are rounded.

  In FIG. 14, a plurality of embossed portions 22G and 22H arranged in the width direction of the packaging bag 10 are provided in two rows. The embossed portions 22G and 22H are provided alternately (in a staggered arrangement), and are arranged so that the embossed portions in other rows block the intervals between adjacent embossed portions.

  Finally, a method for manufacturing a packaging bag having the above structure will be described.

In the case of a three-side-sealed packaging bag (i) A longitudinal sealing is performed by a filling and packaging machine, and the film is formed into a cylindrical shape.
(Ii) The lower end of the bag is sealed perpendicular to the longitudinal seal so that the longitudinal seal performed in (i) is located on the side edge of the bag.
(Iii) The contents (powder) are filled from the upper opening of the bag.
(Iv) The upper end of the bag is sealed perpendicular to the longitudinal seal, and in the subsequent upper end seal cooling step, the lower part of the opening is embossed with an uneven cooling die and embossed.

In the case of a pillow-shaped packaging bag (i) The longitudinal direction is sealed by a filling and packaging machine, and the film is formed into a cylindrical shape.
(Ii) The lower end of the bag is sealed perpendicular to the longitudinal seal so that the longitudinal seal performed in (i) is located at the center of the back of the bag (formation of the back seal).
(Iii) The contents (powder) are filled from the upper opening of the bag.
(Iv) The upper end of the bag is sealed perpendicularly to the longitudinal seal, and in the subsequent cooling process of the upper end seal, the lower part of the opening is embossed with an uneven-shaped cooling die and embossed.

  A film suitable for manufacturing the packaging bag will be described. As a packaging material, a laminated film mainly composed of plastic is used. In the case of a simple structure, a laminated film having a structure in which a sealant layer is laminated on a base film layer is used. Depending on the contents filled in the packaging bag, or on the handling conditions after filling, or depending on the required performance such as water vapor and other gas barrier properties, light shielding properties, various mechanical strengths, etc. For example, a laminated film having a structure in which a water vapor or other gas barrier layer, a light shielding layer, a strength improving layer, or the like is laminated as an intermediate layer is used between the sealing layer and the sealant layer.

  The above-mentioned base film layer, water vapor and other gas barrier layers, light shielding layers, intermediate layers such as strength improving layers, sealant layers, etc. may each be formed as a single layer, but may be formed by laminating a plurality of layers. May be.

  In addition to the biaxially stretched film of polyester such as polyethylene terephthalate (PET) and polyethylene naphthalate, the base film layer is also biaxially stretched of polyamide such as nylon 6, nylon 66, MXD6 (polymetaxylylene adipamide) A film, a biaxially oriented polypropylene film (OPP), paper or the like can be suitably used.

  Examples of the gas barrier layer include saponified ethylene / vinyl acetate copolymer (EVOH), polyvinylidene chloride (PVDC), polyacrylonitrile (PAN), aluminum foil (AL), silica, alumina, Biaxially stretched nylon film (ONY) provided with a vapor deposition layer such as aluminum or a coating layer of PVDC, polyethylene terephthalate (VMPET) provided with a vapor deposition layer such as silica, alumina, aluminum, biaxially stretched polyethylene terephthalate film (PET film) ), Biaxially stretched polypropylene film (OPP film) and the like can be used. Among these, a film provided with an aluminum foil or an aluminum vapor deposition layer is opaque and can also serve as a light shielding layer.

  As the above-mentioned strength improving layer, any of the above base films may be additionally laminated as appropriate, and a biaxially stretched high-density polyethylene film or the like may be laminated also as a moisture-proof layer.

  In addition, an easily tearable uniaxially stretched polypropylene film, a uniaxially stretched high-density polyethylene, an easily tearable biaxially stretched polyester film ("Emblet" PC (easy to tear in the MD direction), manufactured by Unitika Ltd.), etc. Are laminated so that the stretching direction coincides with the tearing direction when the bag is opened, so that tearing can be facilitated and the directionality can be stabilized as an easy-opening means.

  A known dry lamination method or extrusion lamination method (sandwich lamination method) can be used for laminating the base film layer and an intermediate layer such as a gas barrier layer, a light shielding layer, or a strength improving layer.

  The sealant layer includes low density polyethylene (LDPE), linear low density polyethylene (LLDPE), ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene -Acrylate ester copolymer-Polypropylene (VMPP) provided with a vapor deposition layer such as ionomer, polypropylene (CPP), silica, alumina, aluminum, or a copolymer thereof can be used.

  The sealant layer can be laminated by forming a film of the above resin into a film and laminating by a dry lamination method or an extrusion lamination method, or by extruding and laminating the above resin. However, when the contents easily penetrate into the sealant layer, it is preferable to laminate them by the dry lamination method.

  As a specific example of such a laminated film mainly composed of plastic, a packaging material having the following layer structure can be typically mentioned. Since the aluminum foil (AL) has a low repulsive force, when the aluminum foil (AL) is laminated, it is possible to increase the fit between the concave portion and the convex portion of the embossed portion. The following 1) to 8) are laminated films by a dry lamination method, and each layer is bonded with an adhesive. The following 10) and 11) are laminated films by the extrusion lamination method, and PE (polyethylene) serves as an adhesive layer. The values in parentheses indicate the thickness of each layer.

1) PET (12 μm) / CPP (30-60 μm)
2) PET (12 μm) / LLDPE (30-60 μm)
3) PET (12 μm) / ONY (15 μm) / LLDPE (30-60 μm)
4) PET (12 μm) / VMPET (12 μm) / LLDPE (30-60 μm)
5) PET (12 μm) / VMPET (12 μm) / CPP (30-60 μm)
6) PET (12 μm) / AL (7 μm) / LLDPE (30-60 μm)
7) OPP (20 μm) / CPP (30-60 μm)
8) OPP (20 μm) / LLDPE (30-60 μm)
9) OPP (20 μm) / VMPP (30-60 μm)
10) PET (12 μm) / PE (15-30 μm) / AL (7 μm) / PE (15-30 μm)
/ LLDPE (30-60μm)
11) PET (12 μm) / PE (15-30 μm) / VMPET (12 μm) / PE (15-30 μm) / LLDPE (30-60 μm)

  As the packaging material, in addition to the above-mentioned laminated film mainly composed of plastic, a packaging material having paper in the layer structure can also be used. As a laminate of such papers, a packaging material having the following layer structure can be exemplified. Since the repulsive force of paper is lower than that of plastic, it is possible to increase the fit between the concave portion and the convex portion of the embossed portion as compared with the case where it is made of only plastic. The following 12) to 15) are laminated films by the dry lamination method, and each layer is bonded with an adhesive. The following 16) to 19) are laminated films by the extrusion lamination method, and PE (polyethylene) serves as an adhesive layer. The values in parentheses indicate the thickness of each layer.

12) Paper (30 g / m ² ) / CPP (30-60 μm)
13) Paper (30 g / m ² ) / LLDPE (30-60 μm)
14) Paper (30 g / m ² ) / AL (7 μm) / CPP (30-60 μm)
15) Paper (30 g / m ² ) / AL (7 μm) / LLDPE (30-60 μm)

16) Paper (30 g / m ² ) / PE (15-30 μm) / AL (7 μm) / PE (15-30 μm)
/ LLDPE (30-60μm)
17) Paper (30 g / m ² ) / PE (15-30 μm) / AL (7 μm) / PE (15-30 μm)
/ CPP (30-60μm)
18) PET (12 μm) / PE (15-30 μm) / paper (30 g / m ² ) / PE (15-30 μm)
/ AL (7 μm) / PE (15-30 μm) / LLDPE (30-60 μm)
19) PET (12 μm) / PE (15-30 μm) / paper (30 g / m ² ) / PE (15-30 μm)
/ AL (7 μm) / PE (15-30 μm) / CPP (30-60 μm)

  Actually, a packaging bag was prepared using a laminated film of PET (12 μm) / PE (15 μm) / AL (7 μm) / PE (15 μm) / LLDPE (30 μm) to form an embossed portion. When the contents of the coffee powder filled with the contents were torn, the coffee powder was not scattered.

10, 10A, 10B, 10C Packaging bag
11 Opening seal
18 Front side film
19 Back side film
21 Opening location
22, 22A, 22B, 22C, 22D, 22E, 22F, 22G, 22H Embossed section

Claims (1)

A packaging bag with the contents filling opening sealed after filling the contents,
At the position where the opening is opened from the sealed part toward the center, the width of the packaging bag is such that the inner surface of the film on both sides is embossed at the same place so that the inner surfaces thereof are uneven. Embossed part is formed by molding in the direction, and this embossed part is inclined with respect to the side edge part without the seal part formed by folding the film on both sides
Packaging bag.

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