JP4635495B2 - Easy-to-open gusset bag - Google Patents

Description

  The present invention relates to an easy-open gusset bag for collecting and packaging sachets of various foods including sprinkled foods. More specifically, the present invention is not only easy to open but also has a convenience function for easily taking out sachets. It relates to an open gusset bag.

  Conventionally, various packaging bags using synthetic resin films or sheets have been proposed and used for filling and packaging food, household goods, toiletries, pharmaceuticals, miscellaneous goods, and the like.

  The packaging material also corresponds to the body to be packaged, and a laminated film in which a desired synthetic resin film is laminated is manufactured, and this is used, for example, side seal, two-side seal, three-side seal, four-side seal, envelope sticker seal, A packaging bag using any seal form such as a center joint seal (pillow seal), a pleated seal (gusset seal), a flat bottom seal, or a square bottom seal is common.

  Various packaging bags using a synthetic resin film or sheet as described above are completely sealed for the preservation and protection of the contents.

  Therefore, when opening for taking out the contents, it is common to open using the opening break provided in the packaging bag or a V-shaped notch.

  By the way, among the various forms of packaging bags, gusset bags with folds on both sides of the torso contain a wider variety of contents than flat packaging bags such as three-side seal bags and four-side seal bags. Since it has many merits such as being possible, it is often used for packaging foods.

  In particular, the gusset bag is an optimal packaging form when collecting and packaging small bags of various foods including sprinkled foods.

  However, even in the case of this gusset bag, when opening for taking out a small bag like other packaging bags, the opening cut provided in the gusset bag or a V-shaped notch is used. It is common to open the package.

  For example, a part of the outer end of the hermetic seal part at the upper end of the bag is provided with a notch or a notch made of a V-shaped notch, and one upper end of the bag is formed from the notch. It can be opened by tearing along the part corresponding to the tear line.

  That is, from the upper notch of the gusset bag, the upper and lower bag parts are picked with fingers, and the notch is used as an opening start point. While each of the bag portions was pulled in opposite directions, the bag portion was cut along one tear line and opened.

  In addition, since the gusset bag is a form in which the upper end portion of the bag is cut and opened, the film piece at the upper end portion of the cut bag is discarded, and when the bag after opening is resealed, The upper end of the opened bag was bent or rounded and resealed.

As described above, when opening a conventional easy-opening gusset bag, there are individual differences in opening conditions such as how to pick with fingers, picking direction and picking force, and this opening condition slightly affects the opening direction and shape of the film. Then, the tearing direction deviates from the direction corresponding to the normal tearing line, the opening shape is likely to be uneven, and when the bag after opening is resealed, the upper end of the opened bag is folded, There was no choice but to reseal it after rolling it.

  As another example, for example, a slit or a notch made of a V-shaped notch is provided in a part of the top of the hermetic seal portion at the upper end of the bag, and the bag is opened from the notch. In the direction of the bottom of each of the two, it can be opened by tearing along a portion corresponding to one tear line.

  However, in the case of such an easy-open gusset bag, since the packaging material cannot be cut straight if the sealing seal part at the upper end is opened, the shape of the opening part becomes uneven, and the appearance is not good. It was difficult to take out a small bag.

  The present invention is intended to solve such problems of the prior art, and an object of the present invention is to provide an easy-open gazette bag that has not only simple openability but also a convenience function for easily taking out a small bag. .

  The present invention has been made to solve the above-described problems, and the invention according to claim 1 of the present invention is a folding fold (6) in the center of the left and right sides of the body (8) of the tubular film. In a square tube-shaped easy-open gazette bag made of a laminated film (A) having a ceiling seal part (2) at the top and a bottom part (7) sealed, the laminated film (A) is And a laminated film (A) comprising a film layer (10) having linear tearability in at least the top-to-bottom direction of the bag and a seal layer (11) in the innermost layer, and a plurality of notches (3 ) And a perforation line (5) in the circumferential direction (lateral direction) is provided in the body (8) of the gusset bag.

  The invention according to claim 2 of the present invention is the easy-open gusset bag according to claim 1, wherein a plurality of perforation lines (5) in the circumferential direction (lateral direction) are provided.

  The invention according to claim 3 of the present invention is the easy-open gazette bag according to claim 1 or 2, wherein the notch (3) is provided in the laminated film (A) on the front side of the bag. It is a gusset bag.

  The invention according to claim 4 of the present invention is the easy-open gazette bag according to any one of claims 1 to 3, wherein the notch (3) is an unsealed portion provided above the top seal portion (2). (9) is an easy-open gazette bag characterized by being provided.

  The easy-open gusset bag of the present invention has a rectangular tube shape made of a laminated film having folding ridges at the center of the left and right sides of the body of the tubular film, a top sealing portion at the top, and a sealed bottom. In the easy-open gusset bag, the laminated film is composed of a laminated film including at least a linear tearing property in the top-to-bottom direction of the bag and a sealing layer in the innermost layer, and a plurality of notches are provided in the top part, By providing a perforation line in the circumferential direction (lateral direction) in the body portion of the gusset bag, it is possible to have not only easy opening performance but also a convenience function for easily taking out the small bag.

  An embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a perspective view showing one embodiment of an easy-open gazette bag according to the present invention, and FIG. 2 shows one embodiment of the layer structure of the laminated film (A) used in the easy-open gazette bag according to the present invention. It is a sectional side view.

  As shown in FIG. 1, an easy-open gazette bag according to one embodiment of the present invention has a folding fold (6) at the center of both left and right sides of a body (8) of a tubular film, and a top seal at the top. It is a square tube-shaped easy-open gazette bag made of a laminated film (A) having a portion (2) and having a bottom (7) sealed.

  Further, as shown in FIG. 2, the laminated film (A) is formed in a layer structure including a film layer (10) having linear tearability at least in the top-and-bottom direction of the bag and a seal layer (11) in the innermost layer. Has been.

  Furthermore, as shown in FIG. 1, the top (1) is provided with a plurality of notches (3), and the trunk (8) of the gusset bag is provided with a circumferential (lateral) perforation line (5). Opened gusset bag.

  In general, when sealing a packaging bag, a thermoplastic resin or the like is used for the innermost sealing layer (11) of the laminated film (A). However, as the sealing strength is increased, the sealing performance can be kept high.

  However, when opening a sealed bag, a notch formed of one cut or a V-shaped notch is provided in a part of the top of the hermetic seal portion at the upper end of the bag, and the notch When the bag is opened by tearing along a portion corresponding to one tear line in the direction of the bottom of the bag, the packaging material cannot be cut straight, and the shape of the opening becomes uneven.

  Alternatively, two cuts or two V-shaped notches are provided in parallel at a predetermined interval in a part of the top of the hermetic seal portion at the upper end of the bag, and from the notch When opening the bag by tearing it into a strip with a predetermined width along the part corresponding to the two tear lines in the direction of the bottom of the bag, the packaging material will not be cut straight, so the shape of the opening will taper off completely. It is in a state where it cannot be opened toward the bottom.

  At this time, depending on the sealing strength of the top seal portion (2), that is, when it is very strong, a phenomenon occurs in which the laminated film is torn at the position of the seal portion and the bag cannot be opened.

  Further, even if the seal part (2) is exceeded, a further taper phenomenon occurs, and the seal part (2) is cut off in the middle.

  Therefore, the easy-open gusset bag according to the present invention is composed of a film layer (10) having linear tearability at least in the top-and-bottom direction of the bag and a laminated film (A) including a seal layer (11) in the innermost layer. It can be easily cut straight from the top (1) in the direction of the bottom (7) along the predicted cut line (4).

  Next, a plurality of notches (3) are provided in the unsealed portion (9) of the top portion (1) of the bag, and the perforated line (5) in the circumferential direction (lateral direction) is formed in the trunk portion (8) of the gusset bag. ) Can be opened stably.

  The plurality of notches (3) may be provided on the front side of the bag or on both sides of the front and back sides.

Cut along the predicted cut line (4) from the notch (3) to the center of the bag body (8), and then along the circumferential (lateral) perforation line (5). Since it cuts, the shape of the opening is cut straight, so that it is easy to take out the sachet as the contents.

  Here, the number of perforation lines (5) in the circumferential direction (lateral direction) formed on the body (8) of the bag is such that the cut from the upper notch (3) portion is in the circumferential direction (lateral direction). It is desirable to put a plurality of lines so as not to pass through the perforation line (5).

  Moreover, it is preferable to put the perforation line (5) in all layers of the laminated film (A) in order to cut the shape of the opening.

  In addition, the method of giving the said notch (3) and perforation line (5) can use the method of incorporating the cutting device which oscillates a laser beam, the rotary die cutter apparatus incorporating a cutting blade, etc. into a bag making machine etc.

  Next, the film layer (10) having linear tearability and the innermost sealing layer (11) constituting the laminated film (A) will be described in detail.

  For the film layer (10) having linear tearability, a uniaxially stretched film stretched in one direction, a stretched film with different longitudinal and transverse stretch ratios, and the like can be used. Any film can be used.

  In the width direction, it may be stretched so as not to shrink or slightly.

  Generally, a plastic film is roughly classified into a stretched film and an unstretched film. The stretched film is oriented by stretching the plastic film in two longitudinal and / or horizontal directions while heating the plastic film to a temperature below the melting point. An unstretched film is an unstretched film that has not been stretched, and has no molecular chain orientation and free molecular motion, and can be bonded by heat melting (heat sealing).

  The molecular chains of the stretched film are oriented in one direction in uniaxial stretching and in the plane direction in biaxial stretching, and the physical properties of the unstretched film can be improved.

  In general, when stretched, a plastic film increases waist (rigidity), transparency, tensile strength, and shrinkage, and improves gloss, moisture resistance and air resistance, but decreases elongation and tear strength.

  Examples of the material of the film layer (10) include polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT), polyethylene (PE), polypropylene (PP), and polystyrene ( PS) polyolefin, nylon-6, nylon-66 polyamide (PA), polycarbonate (PC), polyacrylonitrile (PAN), polyimide (PI), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), Polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), polyether sulfone (PES), polymethyl methacrylate (PMMA) and the like, and stretched films of these copolymers can be used.

  Usually, among these, it is particularly preferable to use a polyethylene terephthalate film (PET) and a polypropylene film (PP) arbitrarily stretched in the biaxial direction from the viewpoint of strength, cost, and the like.

  The thickness of the film layer (10) is preferably in the range of 3 to 200 μm, more preferably in the range of 6 to 30 μm, in consideration of processability.

  Next, the innermost seal layer (11) includes, for example, a low density polyethylene resin (LDPE), a medium density polyethylene resin (MDPE), a high density polyethylene resin (HDPE), a polypropylene resin (PP), and an ethylene-propylene co-polymer. Polymer (EP), ethylene-α olefin copolymer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-methacrylic acid ester copolymer, ethylene-acrylic acid ester A film made of a copolymer, an ionomer resin, an ethylene-vinyl acetate copolymer (EVA), or the like can be used.

  Among these, considering the linear tearability of the laminated film (A), a stretched polypropylene film (HSOPP) having heat sealability is preferable.

  The thickness of the seal layer (11) is preferably in the range of 15 to 200 μm, more preferably in the range of 30 to 60 μm, in consideration of strength and workability.

  Next, the method of laminating the film layer (10) having linear tearability and the innermost sealing layer (11) includes, for example, a dry lamination method, a non-solvent dry lamination method, a hot melt lamination method, and an extrusion lamination. A known method such as a sandwich lamination method using the method can be used.

  For example, the dry lamination method includes three sections: a coating unit that applies an adhesive on a film, a drying device, and a nip roller unit, and an unwinding, winding, and tension control system.

  The coating portion generally employs a gravure roll coating method or a reverse roll coating method.

  The adhesive layer (not shown) used for the dry lamination is generally made of polyurethane, polyacrylic, polyester, epoxy, polyvinyl acetate, cellulose, or other adhesives for laminating. Can be used.

  As the lamination adhesive, a solvent-type adhesive or a solvent-free adhesive is used. However, when a solvent-free adhesive is used, a drying apparatus is unnecessary, and in particular, a non-solvent dry lamination method and I'm calling.

  The hot melt lamination method is a method in which a hot melt adhesive such as a heat-melted ethylene-vinyl acetate copolymer (EVA) is applied onto a film, and another film is immediately laminated.

  The extrusion lamination method involves heating a thermoplastic resin such as polyethylene or polypropylene, melting it in a cylinder called a cylinder, extruding it by applying pressure with a screw, and forming a narrow slit called a T die at the tip of the cylinder. The resin melted in the form of a curtain is extruded and laminated into a film.

  At this time, using the extrusion lamination method, a thermoplastic resin such as polyethylene or polypropylene is used instead of an adhesive, and a film layer (10) having linear tearability, and an innermost sealing layer (11), A sandwich lamination method of laminating can also be used.

Next, the laminated film (A) may have a configuration in which a barrier film is laminated on one side or both sides of a film layer (10) having linear tearability. (Not shown)
Examples of the barrier film include an aluminum foil, an aluminum vapor-deposited film, a resin film having a thin film of an inorganic oxide (such as silicon oxide and aluminum oxide), an ethylene / vinyl alcohol copolymer, polyvinyl alcohol, and ethylene-vinyl acetate copolymer. Films of combined saponified products, films obtained by coating polyvinylidene chloride on saponified products of polyethylene terephthalate, polyamide, polyvinyl alcohol, ethylene-vinyl acetate copolymer, etc., and laminated materials combining one or more of these films However, it is preferable to use an aluminum foil having good gas barrier properties and easy tearability.

  The laminated film may include a printed layer (not shown), an anchor coating layer (not shown), etc. in addition to the above-described configuration.

  First, when a film layer (10) having a linear tearing property or a printing layer on a barrier film is provided, the printing surface of the film can be printed on either the front or back side, but in the case of printing on a general plastic film bag Similarly, it is preferable to provide a printing layer with a beautiful pattern on the inner surface of the film in consideration of the friction resistance, weather resistance, etc. of the ink, for the purpose of improving the sales promotion effect of the product.

  As the printing ink for forming the printing layer, a color material composed of a pigment or a dye that gives color to the ink, a resin that adheres to the printing medium while dispersing and holding the color material in fine particles, and the resin are used. A vehicle composed of a solvent that can stably dissolve, disperse the pigments and dyes, maintain the fluidity of the ink, and transfer an appropriate amount of ink from the printing plate, and further disperse the coloring material. The pigment is formed from an auxiliary agent such as a surfactant for the purpose of improving color development, preventing precipitation, and improving fluidity. In particular, the colorant is preferably a pigment having good weather resistance.

  The printing method for providing the printing layer is not particularly limited as long as it is a printing method capable of printing on the film layer (10). However, copper plating is applied to the surface of an iron cylinder (cylinder) to form a base, and the copper layer A release layer is provided on the plated surface, copper is further plated, and the surface is mirror-polished to create a recess (cell) by engraving or corrosion, and the printing ink in the cell is applied to the copper surface. A gravure printing method is preferable, in which the film layer (10) is transferred and colorfully printed even with a tone, and the appealing effect is high.

  In addition, when printing on the film layer (10), if necessary to improve the adhesion between the film layer (10) and the printing ink, the surface of the film layer (10) on which the printing layer is provided is treated with ozone. Pretreatment such as corona treatment is preferably performed, and an anchor coating agent or the like may be further coated.

  Examples of the anchor coat agent include isocyanate-based (urethane-based), polyethyleneimine-based, polybutadiene-based, and organic titanium-based anchor coat agents, or polyurethane-based, polyacrylic-based, polyester-based, epoxy-based, and polyvinyl acetate-based. Adhesives for laminating such as cellulose and others can be used.

  As a method for coating the anchor coating agent, a known gravure roll coating method, bar coating method, dropping method, reverse roll coating method, or the like can be used.

A film layer (10) having a linear tearing property and a sealing layer (
11) Using the laminated film (A) consisting of 11), as shown in FIG. 1, a back seal or a vertical seal (not shown) at one corner of a quadrangular prism was used to produce a cylindrical film.

  Next, a folding fold (6) is provided in the center of the left and right sides of the body (8) of the tubular film, and two notches (3) are formed on the top side (1) of the laminated film (A). Further, three perforation lines (5) are provided in the circumferential direction (lateral direction) on the body portion (8) of the gusset bag, and the bottom portion (7) is sealed to prepare a square tube-shaped easy-open gusset bag.

  Using such an easy-open gusset bag, the sachets containing sprinkled food were collected and packaged, and the top (1) of the bag was heat-sealed and sealed.

  Next, the easy-open gusset bag in such a state was used, and the opening situation and the state of taking out the contents were confirmed.

  First, when opened from the top (1) to the bottom (7) direction through the two notches (3) of the bag, it intersects with the uppermost perforation line (5) in the circumferential direction (lateral direction), Next, in the counterclockwise direction, the circumference of the trunk (8) of the gusset bag (8) can be cut linearly by making one round along the perforation line (5). A certain opening was obtained on the surface, and the sprinkled food-containing sachet could be easily taken out.

  Hereinafter, the easy-open gazette bag of the present invention will be described in more detail with specific examples.

  As shown in FIG. 2, the laminated film (A) used for the easy-open gazette bag of the present invention has a 12 μm-thick longitudinally uniaxially stretched polyethylene terephthalate film on the outermost surface side linear tear film layer (10). (PET) is used, a heat-sealable stretched polypropylene film (HSOPP) having a thickness of 30 μm is used for the innermost seal layer (11), and a urethane-based adhesive is used for the adhesive layer (not shown). And was produced by a dry lamination method.

  Using the laminated film (A) comprising the linear tearable film layer (10) and the sealing layer (11) produced as described above, as shown in FIG. A folding fold (6) is provided at the center of the left and right sides of the body (8) of the tubular film provided with a vertical seal (not shown), and two pieces are provided on the top side (1) of the laminated film (A). The notch (3) was provided with a bag making machine incorporating a rotary die cutter device.

  Furthermore, the body part (8) of the gusset bag is provided with three perforations (5) in the circumferential direction (lateral direction), the bottom part (7) is sealed, and a square tubular easy-open gusset bag is produced, Twenty pouches containing sprinkled food were collected and packaged.

  Next, the easy-open gusset bag in such a state was used, and the opening situation and the state of taking out the contents were confirmed.

  First, when opened from the top (1) to the bottom (7) direction through the two notches (3) of the bag, it intersects with the uppermost perforation line (5) in the circumferential direction (lateral direction), Next, in the counterclockwise direction, the circumference of the trunk (8) of the gusset bag (8) can be cut linearly by making one round along the perforation line (5). A certain opening was obtained on the surface, and the sprinkled food-containing sachet could be easily taken out.

  In Example 1, an easy-open gazette bag was formed in the same manner except that a 25 μm-thick longitudinally uniaxially stretched heat-sealable polypropylene film (OPP) was used for the film layer (10) having linear tearability on the outermost surface side. Produced.

  Next, the easy-open gusset bag in such a state was used, and the opening situation and the state of taking out the contents were confirmed.

  First, when opened from the top (1) to the bottom (7) direction through the two notches (3) of the bag, it intersects with the uppermost perforation line (5) in the circumferential direction (lateral direction), Next, in the counterclockwise direction, the circumference of the trunk (8) of the gusset bag (8) can be cut linearly by making one round along the perforation line (5). A certain opening was obtained on the surface, and the sprinkled food-containing sachet could be easily taken out.

  In Example 1, an easy-open gazette bag was produced in the same manner except that a low-density polyethylene film (LDPE) having a thickness of 30 μm was used for the innermost seal layer (11).

  Next, the easy-open gusset bag in such a state was used, and the opening situation and the state of taking out the contents were confirmed.

  First, when opened from the top (1) to the bottom (7) direction through the two notches (3) of the bag, it intersects the perforated line (5) in the circumferential direction (lateral direction), Next, in the counterclockwise direction, the body part (8) of the gusset bag can be cut straight along the perforation line (5) along the perforation line (5). A certain opening was obtained on the surface, and the sprinkled food-containing sachet could be easily taken out.

  In Example 2, an easy-open gazette bag was produced in the same manner except that a low-density polyethylene film (LDPE) having a thickness of 30 μm was used for the innermost seal layer (11).

  Next, the easy-open gusset bag in such a state was used, and the opening situation and the state of taking out the contents were confirmed.

  First, when opened from the top (1) to the bottom (7) direction through the two notches (3) of the bag, it intersects with the uppermost perforation line (5) in the circumferential direction (lateral direction), Next, in the counterclockwise direction, the body part (8) of the gusset bag can be cut straight along the perforation line (5) along the perforation line (5). A certain opening was obtained on the surface, and the sprinkled food-containing sachet could be easily taken out.

It is a perspective view which shows one Example of the easy-open gazette bag which concerns on this invention. It is a sectional side view which shows one Example of the laminated constitution of the laminated film used for the easy-open gazette bag which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Top part 2 ... Top seal part 3 ... Notch 4 ... Cut expected line 5 ... Perforation line 6 ... Folding collar 7 ... Bottom part 8 ... Trunk part 9. .... Unsealed part 10 ... Film layer having linear tearability 11 ... Sealing layer A ... Laminated film

Claims (3)

In the square tube-shaped easy-open gazette bag made of a laminated film having a folding fold at the center of the left and right sides of the body of the tubular film, a top seal portion at the top, and a bottom sealed
The laminated film is composed of a film layer having linear tearability at least in the top-and-bottom direction of the bag, and a laminated film including a seal layer in the innermost layer,
A plurality of notches are provided in the top, and a plurality of perforations in the circumferential direction (lateral direction) are provided in the trunk of the gusset bag, and the plurality of perforations are arranged close to each other. Easy-to-open gusset bag.   The easy-open gazette bag according to claim 1, wherein the notch is provided in a laminated film on the front side of the bag.   The easy-open gusset bag according to claim 1 or 2, wherein the notch is provided in an unsealed portion provided above the top seal portion.

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