JP5636659B2 - Easy-open packaging bag - Google Patents

Description

  The present invention can be easily torn and opened, the tear opening line when torn and opened is clean, and the position of the tear opening line is between one laminate and the other laminate constituting the packaging bag. By being different, the present invention relates to an easy-open packaging bag that can be easily picked at the opening end face and open the packaging bag.

  Conventionally, a packaging bag is usually provided with an opening start means and an opening means so that the contents can be taken out by hand without using a tool such as a pinch. Examples of the opening start means include notches such as I-shape, V-shape, U-shape, and turtle shell-shape provided on the outer edge of the side edge thermal bonding portion of the packaging bag, or a group of scars. The opening means can be any of cuts and perforations provided in any layer or plural layers, leaving at least one layer of the laminate constituting the packaging bag, or any of the laminates constituting the packaging bag Examples of such a layer include a uniaxially stretched film having directionality along the opening direction.

  The three-side seal bag and four-side seal bag provided with the above-mentioned opening means are easy to start opening, but if the tearing is continued, the laminated body constituting the packaging bag will be forcibly and torn with a strong force. There is a problem that the opening of the opening is unsightly because the tear opening line does not have a fixed shape when it is torn.

  Further, the three-side seal bag and the four-side seal bag provided with the opening start means and the opening means can be easily torn from the opening means, whereas the opening side means the front side laminated film and the back side laminated film constituting the packaging bag. Since the cut lines of the surface side laminated film and the back side laminated film overlap each other over the entire length in the state after opening, each of the surface side laminated film and the back side laminated film is picked. There is a problem that it is difficult to separate the contents and it is difficult to take out the contents.

  Thus, the packaging bag can be easily opened and opened from the opening start means, and the front side laminated film and the back side laminated film constituting the packaging bag can be easily picked when the contents are taken out. An easy-open packaging bag that can be opened easily is proposed (for example, Patent Document 1). The technology disclosed in this easy-open packaging bag is such that the front side laminated film and the back side laminated film formed by folding a laminated film for packaging comprising one or more synthetic resin layers are overlapped and heat-sealed at the periphery. Easy-opening formed by forming a linear groove portion for tearing extending from one side edge to the other side edge in at least one synthetic resin layer of each of the front side laminated film and the back side laminated film A packaging bag, wherein the linear part formed on the front side laminated film and the linear groove part formed on the back side laminated film are positioned without overlapping each other at least in the central part in the width direction of the packaging bag. On the other hand, at least one side edge is overlapped (Claim 1), and when the packaging bag is opened, the respective linear groove portions are traced to start from one side edge of the packaging bag. Each tear opening that proceeds to the side edge is located at a different position in the center of the packaging bag in the width direction, making it easy to open the opening edge of each of the front and back side laminated films. The contents can be easily picked up and taken out easily.

  However, in the easy-open packaging bag of Patent Document 1, the linear groove portion formed in the front surface side laminated film and the linear groove portion formed in the back surface side laminated film constituting the packaging bag are at least one side edge. Preferably, it is necessary to be positioned so as to overlap each other at both side edges, and it is complicated to align the positions, and there is a problem that the packaging bag cannot be opened when the positions are shifted from each other. .

JP 05-147660 A

  Therefore, the present invention can be easily torn and opened, and after opening, the opening end of the front side laminated film and the opening end of the back side laminated film of the packaging bag can be easily picked and opened. In addition, it is not necessary to match the positions of the tear line formed on the front side laminated film and the tear line formed on the back side laminated film at the side edge of the packaging bag, and easy opening with excellent productivity. It is to provide sex packaging bags.

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a front-side laminated film and a back-side laminated film formed by folding back a rectangular laminate having at least a base material layer and an inner layer made of a heat-adhesive resin. It is a packaging bag in which the inner layers are overlapped with each other and heat-sealed at the peripheral edge, and has side edge heat-bonded portions at least on both side ends, each of the surface-side laminated film and the back-side laminated film being a laminated film A tearing cut line extending from one side end thermal bonding portion to the other side end thermal bonding portion, the tearing cut line and the back side lamination of the front side laminated film. wherein and a tear score line located mutually offset inside of the packaging bag with located mutually offset in the end thermal bonding of the film, the surface side laminated film The tear line for tearing progresses in the direction toward the inner edge of both side edge heat-bonded portions from the two positions retracted inward from the outer edges of both side edge heat-bonded portions. A pair of linear both-side cut lines that extend beyond the inner edge to the inside, and a center-side cut line that connects the inner ends of the pair of linear both-side cut lines are provided. The line of sight swells from both ends toward the lower end side and is folded back toward the upper end side at the center portion, so that the inflection points projecting toward the lower end side are provided at two symmetrical positions, The tear line for tearing of the film proceeds from the two positions retracted inward from the outer edges of both side end thermal bonding portions to the inner edge of both side end thermal bonding portions, and both side end thermal bondings A pair of straight lines that extend beyond the inner edge of the section to the inside Both side cut lines and a center side cut line that connects the inner ends of the pair of linear both side cut lines, and this center part cut line is swelled from both ends toward the upper end side, The inflection points projecting toward the upper end side are provided at two symmetrical positions by folding back toward the lower end side, and at positions near both ends of the tearing cut line of the side end thermal bonding portion. An opening start means is formed, and the opening start means is formed from a scar group penetrating the side end thermal bonding portion, and penetrates the side end thermal bonding portion inside the scar group and protrudes inward. It is an easily openable packaging bag characterized in that a cutout is formed. By constituting in this way, tearing can be started from the opening start means, and the front side laminated film and the back side laminated film are opened along the tearing cut line, and the front side laminated film and the back side are opened at the central portion of the packaging bag. The unsealed end of the side laminated film is displaced, and when the contents are taken out, each of the front side laminated film and the back side laminated film can be picked and the packaging bag can be easily opened.

In addition, when the unsealing start means is composed of a scar group penetrating the side end thermal bonding portion, the unsealing can be started from any position in the area where the scar group is provided.

In addition, it is possible to open from any position where the scar group is provided , and torn, by forming a notch protruding through the side edge thermal bonding portion and projecting inward inside the scar group. After reaching the notch, it will be guided to the inner tear line and can be easily opened along the tear line of the front side laminated film and the rear side laminated film.

The invention according to claim 2 is an easy-open packaging bag characterized in that the tear line of the front side laminated film or the tear line of the back side laminated film is composed of a plurality. By comprising in this way, even if tearing deviates from a specific tearing cut line, it opens along the adjacent tearing cut line, and can open a packaging bag easily.

  The easy-open packaging bag of the present invention can be easily torn and opened, and after opening, the open end of the front side laminated film and the open end of the back side laminated film of the packaging bag can be easily picked. In addition, it is not necessary to match the positions of the tear line formed on the front-side laminated film and the tear line formed on the back-side laminated film at the side edge of the packaging bag. It is possible to provide an easy-open packaging bag excellent in.

The front view which shows 1st Embodiment of the easy-open packaging bag which concerns on this invention. II sectional view taken on the line of FIG. The elements on larger scale which show the other example of the opening start means of 1st Embodiment. The front view which shows 2nd Embodiment of the easily openable packaging bag which concerns on this invention. The front view which shows 3rd Embodiment of the easily openable packaging bag which concerns on this invention. The front view which shows 4th Embodiment of the easy-open packaging bag which concerns on this invention. The front view which shows 5th Embodiment of the easily openable packaging bag which concerns on this invention. The front view which shows 6th Embodiment of the easy-open packaging bag which concerns on this invention. The front view which shows the state after opening the easily openable packaging bag of 6th Embodiment. The enlarged view which shows the opening break formed in the surface side laminated | multilayer film of the easily openable packaging bag of 6th Embodiment.

  The present invention is described in detail below with reference to the drawings. A first embodiment of an easy-open packaging bag according to the present invention will be described with reference to FIGS. 1 and 2.

  The first embodiment of the present invention is as shown in FIGS. As shown in FIG. 1, the planar shape is such that a rectangular front side laminated film A on the front side and a rectangular back side laminated film B on the back side are overlapped with each other, and both sides and bottoms are It is a three-side sealed packaging bag having a side end thermal bonding portion 2 and a bottom thermal bonding portion 3 formed by heat bonding, and each of the front side laminated film A and the rear side laminated film B constituting the packaging bag In the vicinity of the opening end of the packaging bag, tear line lines 4 and 5 that are orthogonal to the side end thermal bonding portion 2 and extend from one side end thermal bonding portion 2 to the other side end thermal bonding portion 2 are formed, The tearing cut line 4 formed on the front surface side laminated film A is formed in parallel to the bottom thermal bonding portion 3, and the tearing cut line 5 formed on the back side laminated film B is the bottom portion heat at the center portion. It is formed to be convex toward the bonding part 3 side. Further, a scar group 6 penetrating the side end thermal bonding portion 2 is formed in the side end thermal bonding portions 2 at both ends of the tearing cut lines 4 and 5, and a side end thermal bonding portion inside the scar group 6. 2 is a shape in which a notch 7 formed of a crescent-shaped hole projecting inward is formed so that the tip of the projecting portion is at the position of the score line 4. In addition, the notch 7 which consists of the scar group 6 and the crescent-shaped hole is an opening means. In the first embodiment, the shape of the packaging bag is a three-sided seal bag, but it may be a self-supporting bag that is folded inward at the bottom, and the shape is arbitrary as long as the packaging bag has the opposite side end thermal bonding portions 2. is there.

  The cross-sectional shape of the portion where the tear lines 4 and 5 are formed in the first embodiment is as shown in FIG. The easy-open packaging bag is composed of a front-side laminated film A and a back-side laminated film B on which a base material layer 11, an intermediate layer 12, and a heat-adhesive resin layer 13 are laminated. In the intermediate layer 12 of the film B, linear tearing cut lines 4 and 5 are formed, respectively, and the tearing cut lines 4 and 5 of the front side laminated film A and the back side laminated film B are vertically arranged in the central portion. A step d is provided.

  When opening the easy-open packaging bag of the first embodiment, even when tearing starts from an arbitrary position on the edge of the packaging bag in the portion where the scar group 6 is formed, the portion where the scar group 6 is formed Is cut out to reach the notch 7 formed of a crescent-shaped hole, and the tip protruding inside the notch 7 is positioned at the cut lines 4 and 5, and then the surface side laminated film A is torn. It can tear along each of the cut line 4 for tearing, and the cut line 5 for tearing the back surface side laminated film B. Therefore, even when the tear start position by the scar group 5 and the position of the cut line 4 are misaligned, the inside of the notch 7 can be torn linearly along the cut line 4, and after opening, the surface side laminated film The opening end of A and the back surface side laminated film B will produce the level | step difference d, this level | step-difference part can be picked, and a packaging bag can be opened easily.

  FIG. 3 is a partially enlarged view showing another example of the opening start means of the first embodiment. Instead of the notch 7 formed of a crescent-shaped hole in FIG. 1, it becomes a “shape” notch 7 extending to the end edge side of the side end thermal bonding portion 2. By comprising in this way, when forming the notch 7, dust does not come out and mixing to goods can be prevented.

  A second embodiment of the easy-open packaging bag according to the present invention will be described with reference to FIG. In the second embodiment, the tear line 4 for tearing the front surface side laminated film A is formed so as to protrude toward the bottom heat bonding portion 3 at the center in the opening direction of the bag. The line of sight 5 is formed in parallel with the bottom thermal bonding part 3, and a step is formed at the end part after opening at the center part of the bag. The front side laminated film A and the back side laminated film B of this part Each of these can be picked and opened.

  A third embodiment of the easy-open packaging bag according to the present invention will be described with reference to FIG. In 3rd Embodiment, the tear line 4 for tearing the surface side laminated | multilayer film A is formed from the linear part located in the center part of an opening direction, and the curved part convex to the bottom part heat-bonding part 3 side of the both sides, The tear line 5 for tearing the side laminated film B is formed from a straight line portion located at the center in the opening direction and a curved portion convex to the side facing the bottom heat-bonding portions 3 on both sides thereof. The end portions are stepped on both sides of the central portion in the opening direction, and each of the front side laminated film A and the back side laminated film B can be picked and opened.

  A fourth embodiment of the easy-open packaging bag according to the present invention will be described with reference to FIG. In the fourth embodiment, the tear line 4 for tearing the front surface side laminated film A is a convex curve on the bottom thermal bonding portion 3 side, and the tear line 5 for tearing the back surface side laminated film B is the bottom thermal bonding portion 3. Is a convex curve on the opposite side, and the end after opening is designed to produce a step at the center in the opening direction, and each of the front side laminated film A and the back side laminated film B of this part A pinch can be opened.

  A fifth embodiment of the easy-open packaging bag according to the present invention will be described with reference to FIG. In 5th Embodiment, the tearing cut line 4 of the surface side laminated | multilayer film A and the tearing cut line 5 of the back surface side laminated | multilayer film B are convex on the side facing the bottom part thermal-bonding part 3 located in the opening direction center part. It is composed of a curved portion and straight portions on both sides thereof, and the curved portion is formed to be shifted in the left-right direction. After opening, the front surface picking portion and the back surface are respectively formed on the front surface side laminated film A and the back surface side laminated film B. A knob portion is formed, and each of the front surface knob portion and the rear surface knob portion can be picked and opened.

  A sixth embodiment of the easy-open packaging bag according to the present invention will be described with reference to FIGS. 8 is a front view of the easy-open packaging bag of the sixth embodiment, FIG. 9 is a front view showing a state after the easy-open packaging bag of the sixth embodiment is opened, and FIG. 10 is the sixth embodiment. It is an enlarged view which shows the tear line for tearing formed in the surface side laminated | multilayer film of the easy-open packaging bag of a form, In 6th Embodiment, the tearing line 4 for tearing of the surface side laminated | multilayer film A is an opening direction center part Is a convex curve toward the bottom thermal bonding part 3 side, and the tear line B for tearing of the back side laminated film B is formed by a straight line parallel to the bottom thermal bonding part 3. A level difference is generated at the portion, and each of the front side laminated film A and the back side laminated film B can be picked and opened. In addition, the tear line 4 for tearing the surface-side laminated film A is, as shown in FIG. 10, a cut line in which a plurality of “C-shaped cuts” are linearly arranged in the opening direction, It is formed of a plurality of rows (three rows in the figure) arranged in the orthogonal direction, and can be prevented from warping when opened.

Next, the front side laminated film A and the back side laminated film B constituting the easy-open packaging bag are, as described above, from a laminate in which the base material layer 11, the intermediate layer 12, and the thermoadhesive resin layer 13 are laminated. Is formed. Below, each of the base material layer 11, the intermediate | middle layer 12, and the thermoadhesive resin layer 13 is demonstrated.
Since the base material layer 11 is a basic material constituting a packaging bag, a synthetic resin film having excellent properties in mechanical, physical, chemical and the like can be used. For example, polyester-based, polyamide Resins such as those based on polypropylene and polypropylene can be used. Moreover, as a film using these resin, the stretched film extended | stretched to the biaxial direction is suitable. This is because usually the substrate layer 11 is often printed and printability is required. In addition, the thickness of the film constituting the base material layer 11 may be a thickness that can be held to the minimum necessary for strength, rigidity, etc. as a basic material, and may be determined in consideration of costs, It is approximately 12 to 25 μm. As the base material layer 11, other synthetic resin films can be used besides the stretched film, and the stretched film is not particularly limited. Further, a paper material such as rayon paper or glassine paper can be used.

  The intermediate layer 12 is provided with rigidity, light-shielding property, gas barrier property, etc. when used as a packaging bag. Biaxially stretched polyethylene terephthalate, biaxially stretched nylon, biaxially stretched polyvinyl alcohol, ethylene-vinyl alcohol A copolymer or the like can be used.

  The heat-adhesive resin layer 13 may be a layer formed from a heat-adhesive resin that can be melted by heat and welded to each other, and may be appropriately selected and used depending on the physical properties required for the packaging bag. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer, ethylene-acetic acid It can be formed from a vinyl copolymer, an ionomer resin, an acid copolymer of ethylene and acrylic acid, an ester copolymer of ethylene and acrylic acid ester, or the like.

The specific structure of the laminated film is as follows: biaxially stretched polyethylene terephthalate / dry lamination / biaxially stretched nylon / dry lamination / polypropylene, biaxially stretched polypropylene / dry lamination / biaxially stretched nylon / dry lamination / polyethylene, biaxial stretch Polypropylene / dry lamination / biaxially stretched polyethylene terephthalate / dry lamination / polyethylene, paper / polyethylene / aluminum foil / ethylene-methacrylic acid copolymer and the like, and a score line is formed in the underlined layer.

  The length in the direction perpendicular to the cut line of the scar group formed at both ends of the cut line is not particularly limited, but is preferably 5 to 10 mm, and the width in the direction parallel to the cut line of the scar group is from the edge to the side edge thermal bonding portion. It is preferable to make it within 1/2 of the width. With regard to the position of the notch, it is preferable that the tip of the projecting part facing inward is formed at the approximate center of the width of the side edge heat-bonded part. It is necessary to make it larger than the length perpendicular to the line of sight. There is no problem even if a scar group is formed in a region outside the notch, and there is a region where no scar is formed between the scar group and the notch.

  The scar group is preferably formed by piercing with a needle. The shape of the needle for forming the scar is a quadrangular needle-like projection, and the direction connecting the opposing ridge lines of the quadrangular pyramid is parallel to the score line. It is preferable to arrange so that The size of the piercing hole is preferably 0.1 to 0.5 mm in diameter and the interval between adjacent holes is preferably 0.5 to 1.0 mm.

  The manufacturing method of the easy-open packaging bag according to the embodiment uses a laminated film in which a score line is formed, and a process for producing a packaging bag by a well-known bag-making method so that the score line is at the planned opening position. After forming the side edge thermal bonding portion, the side edge thermal bonding portion at both ends of the score line is pierced at a predetermined location using a piercing tool in which needle-like protrusions are formed in the shape of the scar group, thereby forming the scar group. . The notch is formed at a position inside the scar group in the side edge thermal bonding portion using a predetermined-shaped cutting blade. By using a piercing tool provided with a cutting blade for forming a needle-like protrusion and a notch in the shape of the scar group, the scar group and the notch can be simultaneously formed in one step. As described above, since the scar group and the notch can be formed in the process of making the packaging bag, it can be efficiently produced without providing a separate process for forming the scar group and the notch.

DESCRIPTION OF SYMBOLS 1 Container 11 Base material layer 12 Intermediate | middle layer 13 Thermal-adhesive resin layer 2 Side edge thermal-bonding part 3 Bottom thermal-bonding part 4, 5 Tear line for tearing 6 Scratch group 7 Notch A Surface side laminated film B Back surface side laminated film

Claims (2)

At least the inner layer of the front side laminated film and the rear side laminated film formed by folding back a rectangular laminate having a base material layer and an inner layer made of a heat-adhesive resin is overlapped to heat-seal the periphery. A packaging bag having side end thermal bonding portions at least on both side ends, wherein each of the front side laminated film and the back side laminated film is formed in at least one layer constituting the laminated film, and one side end thermal bonding portion. A tear score line extending from the first side edge toward the other side edge thermal bonding portion, and the tear score line of the front surface side laminated film and the tear score line of the back surface side laminated film are the side edge thermal adhesion portion. in located mutually offset inside of the packaging bag as well as positioned mutually offset, the tear score line is the outer edge of both the side edge heat-bonded portion of the surface laminate film A pair of linear double-sided cuttings that proceed in the direction toward the inner edge of both side edge thermal bonding portions from the two locations that are respectively retracted inward and extend further beyond the inner edge of both side edge thermal bonding portions to the inner side. A center-side cut line connecting the inner ends of the pair of linear both-side cut lines, and the center-side cut line swells from the both ends toward the lower end side in the center part. By folding back toward the upper end side, only two inflection points projecting toward the lower end side are provided at left and right symmetrical positions, and the tear line for tearing the back side laminated film has both side end thermal bonding portions. A pair of straight lines that proceed in the direction toward the inner edge of both side end thermal bonding portions from the two positions retracted inward from the outer edge of each side and reach the inner side beyond the inner edge of both side end thermal bonding portions Both side cut lines and a pair of straight both side cuts It is equipped with a central cut line that connects the inner ends of the two, and this central cut line bulges toward the upper end side from both ends, and folds back toward the lower end side at the central portion, thereby protruding to the upper end side. Two inflection points are provided at symmetrical positions, and opening start means are formed in the vicinity of both ends of the tearing cut line of the side end thermal bonding portion, and the opening start means is Easy-openability characterized in that it is formed from a group of scars penetrating through the side edge thermal bonding portion and a notch protruding through the side edge thermal bonding portion and protruding inward is formed inside the scar group. Packaging bag. The easy-open packaging bag according to claim 1, wherein the tear line of the front side laminated film or the tear line of the back side laminated film is composed of a plurality.

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