JP2015189483A - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag opened by tearing up from a notch, and openable by linearly tearing up to the last part.SOLUTION: A packaging bag is such that: a notch 6 to be an opening start place is provided at least on one side of a side edge part; an almost V-shaped or U-shaped opening guide line 7 comprising a cut is provided at both front surface side and rear surface side on a base material layer of both front and rear surfaces near a bag center side from the notch 6 so as to be collected to the bag center side; a linear opening schedule line 8 comprising a cut is provided from the tip where the opening guide line 7 is collected to the bag center side, on the base material layer of both front and rear surfaces; and at least one linear opening auxiliary line 9 comprising a cut in parallel to the opening schedule line 8 is provided at each of both sides of the opening schedule line 8 on the base material layer of both front and rear surfaces, in a state not crossing the opening guide line 7. Even when tearing is out of the opening schedule line 8, cutting property is retained through guide of the opening auxiliary line 9 in the outside.

Description

  The present invention belongs to the technical field of packaging bags (pouches) used to store liquids, viscous materials, powders, granules, and the like as contents, and in particular, is cut from a notch provided at an edge and opened. It is related with the packaging bag which can be.

  Conventionally, as a means of opening a packaging bag, there has been a notch for opening at the edge of the bag body, and in order to tear it straight, a straight line across the bag body from the notch There is also known one provided with an opening line composed of a cut line (see Patent Document 1). And it is a packaging bag provided with such a cut line for opening, and puts a "U" -shaped cut (see Patent Document 2) or a bifurcated cut (see Patent Document 3) in the vicinity of the notch. Have been proposed.

JP-A-7-285559 JP 2007-106497 A Japanese Patent Laid-Open No. 2002-2790

  The above-mentioned packaging bag, that is, a packaging bag with a “K” -shaped cut or bifurcated cut in the vicinity of the notch, tears from the notch and opens, the tear reaches the break, and the tear direction is corrected by the break It is said that it can be easily torn along the opening line, but it becomes difficult to tear when the tear is separated from the opening line, and it is impossible to tear and open straight until the end. is there.

  The present invention has been made in view of the above-described problems, and the object of the present invention is a packaging bag that is torn and opened from the notch so that it can be opened by tearing straight until the end. Is to provide a packaging bag.

  In order to achieve the above object, a packaging bag according to the present invention is produced by making a packaging material in which at least a base material layer and a sealant layer are laminated, and is a packaging bag having at least front and back surfaces, At least one side of the side edge is provided with a notch serving as an opening start location, and is substantially V-shaped or substantially U-shaped with a cut in the vicinity of the center of the bag from the notch on both the front side and the back side. The opening guide line is provided on the base material layer on both the front and back sides so as to converge toward the center of the bag, and a straight opening schedule line consisting of a cut is formed from the converged tip of the opening guide line toward the center of the bag. Provided on the base material layers on both the front and back surfaces, and in addition, at least one linear opening auxiliary line composed of a cut parallel to the planned opening line does not cross the opening guide line on each side of the planned opening line. Provided on the front and back base material layers It is characterized in.

  And in said packaging bag, it is preferable that the width | variety of an opening induction | guidance | derivation line, an opening schedule line, and an opening auxiliary | assistant line is 0.1 mm or more and 0.3 mm or less.

  Moreover, in the said packaging bag, it is preferable that the cut | interruption which comprises an opening guide line, an opening schedule line, and an opening auxiliary line is engraved with the laser beam.

  In the packaging bag, the packaging material preferably includes a barrier layer between the base material layer and the sealant layer.

  In the packaging bag, the base material layer is preferably a multilayer coextruded film including a polyester resin layer and a polyamide resin layer.

  Moreover, in the said packaging bag, it is preferable that a multilayer coextrusion film is what laminated | stacked the polyester-type resin layer on the both sides of the polyamide-type resin layer.

  The packaging bag of the present invention is provided with a notch at the side edge as an opening means, and is formed of a cut so as to converge toward the bag center side near the bag center side from the notch on both the front surface side and the back surface side. Provide a guide line, provide a linear opening schedule line consisting of a cut from the tip of the opening guide line toward the center of the bag, and further provide a linear opening auxiliary line consisting of a cut on both sides of the opening schedule line Yes, and the opening assist line does not cross the opening guide line, so the tear from the notch is guided by the opening guide line to the planned opening line, and the opening proceeds with the guide of the planned opening line. Even if it is off the planned opening line, it will be guided by the opening assisting line on the outside and the cut performance will be maintained, so that it can be opened by tearing to the end without being difficult to cut.

It is a front view which shows the packaging bag which concerns on this invention. It is sectional drawing which expands and partially shows the part with a cut in the packaging material which comprises the packaging bag of FIG. It is explanatory drawing which shows the pattern of the cut used for evaluation.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  The packaging bag P in FIG. 1 is a standing pouch. In this packaging bag P, the left and right side seal parts 1 and 2 and the curved bottom seal part 3 are overlapped with each other by superposing two front and back packaging materials while sandwiching the folded bottom part and heat-sealing a predetermined position. The upper seal portion is formed by heat-sealing after the contents are introduced from the upper opening. In FIG. 1, the front surface is denoted by reference numeral 4 and the back surface is denoted by reference numeral 5.

  In this packaging bag P, notches 6 serving as opening opening locations are provided at the left and right side edge portions at a distance from the upper end edge to the lower side. Further, on both the front side and the back side, a V-shaped opening guide line 7 made of a cut is provided in the vicinity of the center of the bag with respect to the notch 6 so as to converge toward the center of the bag. And the linear opening planned line 8 which consists of a cut | interruption is provided from the converged front-end | tip of both the opening guide lines 7 to the bag center side, respectively, By connecting these, the one opening planned line 8 is provided. The leading ends of both opening guide wires 7 are connected to each other. Further, linear opening assist lines 9 made of cuts are provided on both sides of the planned opening line 8 so as to be parallel to the single planned opening line 8.

  The opening assist lines 9 provided on both sides of the planned opening line 8 are provided in a state where both ends thereof do not intersect with the opening guide line 7. Specifically, both ends of the opening assisting line 9 are provided so as to be within a range from a position corresponding to the vicinity of the tip of the opening guiding line 7 to immediately before intersecting with the opening guiding line 7.

  As shown in FIG. 2, the packaging material constituting the packaging bag P is, for example, a laminate in which at least an outer base material layer 11, an inner sealant layer 12, and a barrier layer 13 sandwiched therebetween are laminated. It can be. As the base material layer 11, polyester, polyamide, polypropylene, or the like can be used, and there is no particular limitation as long as it is a plastic film that is generally used as a base material in a packaging bag. The sealant layer 12 may be polyethylene, polypropylene, or the like, and is not particularly limited as long as it is a plastic film that is generally used as a sealant layer in a packaging bag. As the barrier layer 13, a metal foil such as an aluminum foil, a vapor-deposited film composed of at least one of a metal, a metal oxide, and an inorganic substance is provided on a support such as polyethylene terephthalate, an ethylene / vinyl alcohol copolymer, and the like. Can be used.

  The base material layer 11 is preferably stretched, and the sealant layer 12 is preferably not stretched. In particular, as the base material layer 11, it is preferable to use a multilayer coextruded film including a polyester resin layer and a polyamide resin layer, and the multilayer coextruded film has a polyester resin layer laminated on both sides of the polyamide resin layer. It is preferable that

  As shown in FIG. 2, the cut C forming the opening guide line 7, the opening opening line 8, and the opening assisting line 9 is formed only in the base material layer 11 of the packaging material, and is formed in the sealant layer 12 and the barrier layer 13. Is not entered. Such a cut C may be formed in the base material layer 11 when the laminate is manufactured by dry lamination or extrusion lamination, but is preferably engraved by irradiating the laminate with laser light. In the case of using laser light, for example, a carbon dioxide laser is used, and the surface of the base material layer 11 is irradiated with this laser light to melt the surface of the base material layer 1. The type (wavelength) of the laser beam used for forming the cut C is selected according to the resin material of the base material layer 11 into which the cut C is to be inserted.

  Moreover, the packaging material which comprises the packaging bag P of this invention is good also as a laminated body by which two layers, the outer base material layer 11 and the inner sealant layer 12, were laminated | stacked. Also in the case of this packaging material, the cut C is formed only in the base material layer, and when the laminate is manufactured, the cut C is formed in the base material layer 11 or the type (wavelength) of the laser beam is selected. And by irradiating the laser beam from the outside of the base material layer 1, only the base material layer 1 can be melted and the cut C can be made.

  It is preferable that the line width of the cut C forming the opening guide line 7, the opening opening line 8, and the opening assisting line 9 is 0.1 mm or more and 0.3 mm or less. If the line width of the cut line C is less than 0.1 mm, the packaging material is difficult to cut and the openability is deteriorated. From the viewpoint of tearability, 0.2 mm is sufficient for the line width of the cut line C, and it is difficult to make a cut line having a line width exceeding 0.3 mm.

  The interval between the expected opening line 8 and the auxiliary opening line 9 may be 1 mm or more, and preferably 2 mm or more. In FIG. 1, the number of opening assist lines 9 is one on each side of the planned opening line 8, but a plurality of opening assist lines 9 may be provided as necessary.

  To open the packaging bag P of FIG. 1, first, the end portion of the packaging bag is pinched with both hands across the notch 6, and one hand and the other hand are twisted to the opposite side. Then, the tear from the notch 6 reaches the opening guide line 7, and is guided by the opening guide line 7 as it is to the opening opening line 8 at the tip thereof, and the opening proceeds by the guide of the opening opening line 8, and the tearing is scheduled to open. If it does not deviate from the line 8, it is torn to the opening guide line 7 on the opposite side and opened. If the tearing is off the planned opening line 8, it will reach the opening assisting line 9 on the outside, and will be guided by the opening assisting line 9 to maintain the cutting performance. can do.

  Next, in order to confirm the effect of the present invention, a plurality of packaging bags having different cut shapes were produced, and their tearability was evaluated.

  The packaging bag used for evaluation was produced as follows. That is, a 15 μm-thick multi-layer coextruded film having a PET / Ny / PET layer structure was prepared as a base material layer, and a multilayer extruded film (15 μm) / DL / Al (7 μm) / DL / CPP (60 μm) was prepared by dry lamination. ) Was obtained. Then, by making this packaging material, a standing pouch of the type shown in FIG. 1 having a length of 140 mm, a width of 90 mm, and a bottom gusset of 25 mm is manufactured, and then a pulse oscillation type carbon dioxide laser is used. The packaging bag which cut | disconnected with the pattern shown in FIG. 3 by irradiating a laser beam was produced.

  FIG. 3A shows an “embodiment” of the present invention, and the line widths of the unsealing guide line 7, the unscheduled opening line 8, and the unsealing auxiliary line 9 are 0.17 mm. FIG. 3B shows “Comparative Example 1” in which both ends of the opening assisting wire 9 intersect with the opening guide line 7, and FIG. 3C shows “Comparative Example 2” where the opening assisting wire 9 3 (d) is “Comparative Example 3”, the opening guide wire 7 is omitted, FIG. 3 (e) is “Comparative Example 4”, and the opening guide wire 7, The line widths of the planned opening line 8 and the auxiliary opening line 9 are 0.08 mm. In addition, the line | wire width of the opening guide line 7, the opening expected line 8, and the opening assistance line 9 in FIG.3 (b)-(d), ie, the width | variety of a cut, is 0.17 mm same as an Example.

  Twenty samples of each sample were prepared for each packaging bag of Examples and Comparative Examples 1 to 4. Then, after filling them with 100 g of water as the contents and heat-sealing the upper part, a retort treatment was performed by a spray method at 121 ° C. for 30 minutes. Next, these packaging bags were torn so that the end portions of the bags were pinched with both hands at positions where the notches were sandwiched and pulled in opposite directions.

  In the evaluation, a packaging bag that was cut to the end was evaluated as “good”, and a packaging bag that was slightly dislocated from the cut or cut area on the way was determined as “defective”. When the number of “good” is 16 or more, the tearability of the packaging bag is evaluated as “◯”, and when the number of “good” is 15 or less, the tearability of the packaging bag is evaluated as “x”. did. When opening, the opening operation was performed naturally along the opening line as much as possible so as not to deliberately move up and down. The evaluation results are as shown in Table 1. As can be seen from Table 1, it was confirmed that the packaging bags according to the examples of the present invention had good tearability when opened.

  As mentioned above, although embodiment of this invention was described in detail, the packaging bag by this invention is not limited to above-described embodiment at all, and various changes are possible in the range which does not deviate from the meaning of this invention. is there.

  For example, in the above embodiment, the packaging bag applied to the standing pouch has been described. However, the present invention is not limited to this, and for example, a three-side sealed bag, a four-side sealed bag, or the like can be used.

P Packaging bag 1, 2 Side seal part 3 Bottom seal part 4 Front face 5 Back face 6 Notch 7 Opening guide line 8 Opening line 9 Opening auxiliary line 11 Base material layer 12 Sealant layer 13 Barrier layer C Cut line

Claims (6)

  A packaging bag made of a packaging material in which at least a base material layer and a sealant layer are laminated, and having at least front and back surfaces, and provided with a notch serving as an opening start location on at least one side of a side edge portion. Both the front and back sides of the front and back sides are such that a substantially V-shaped or substantially U-shaped opening guide line made of a cut converges toward the center of the bag in the vicinity of the center of the bag with respect to the notch. From the converged tip of the opening guide line toward the center of the bag, a linear opening schedule line consisting of a cut is provided on the base layer on both the front and back surfaces, and the opening schedule line A packaging opening characterized in that at least one linear opening auxiliary line consisting of a cut parallel to each other is provided on both sides of the planned opening line on the base material layer on both the front and back surfaces so as not to cross the opening guide line bag.   2. The packaging bag according to claim 1, wherein the opening guide line, the opening opening line, and the opening auxiliary line have a width of 0.1 mm or more and 0.3 mm or less.   The packaging bag according to claim 1 or 2, wherein the opening guide line, the opening opening line, and the opening auxiliary line are engraved by laser light.   The packaging bag according to any one of claims 1 to 3, wherein the packaging material includes a barrier layer between the base material layer and the sealant layer.   The packaging bag according to any one of claims 1 to 4, wherein the base material layer is a multilayer coextruded film including a polyester resin layer and a polyamide resin layer. The packaging bag according to claim 5, wherein the multilayer coextruded film is obtained by laminating a polyester resin layer on both sides of a polyamide resin layer.

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