JP6406609B2 - Packaging bag - Google Patents

Description

  The present invention belongs to the technical field of packaging bags used for storing liquids, viscous materials, powders, granules, and the like as contents, and in particular, has opening means by continuous cuts, and is manually placed at a predetermined position. The present invention relates to a packaging bag that can be opened and cut.

  Conventionally, many packaging bags have been known that have been devised in various ways to facilitate opening and have been put to practical use. For example, in stick-type packaging bags (pillow bags), by providing notches, notches, or numerous perforations in the joint seal part and upper and lower end seal parts, There are things that can be opened. However, when opening from the joint seal part, after the tear end reaches the bag body of the packaging bag, the bag body will be forcibly fortified, making it difficult to tear smoothly and making the tear part clean. Similarly, even when opening from the end seal part, after the tear end reaches the bag body of the packaging bag, the bag body will be forcibly torn and smooth tearing will occur. In addition to being difficult, in the extreme case, there is a problem that the film is cut off halfway and a sufficient opening cannot be obtained.

  Therefore, a packaging bag is known in which a perforation is provided in a state of crossing the bag body adjacent to the end seal part so that the bag body can be smoothly torn from the non-seal part by hand. (See Patent Document 1). The packaging material forming the packaging bag includes a packaging substrate provided with perforations, and a heat seal layer that is laminated inside the packaging substrate and thermally fused to form the packaging bag. A pillow bag that has been made can easily open the packaging bag from a predetermined position by providing perforations on the packaging substrate.

JP-A-5-305952

  However, there is a problem that opening the perforation is difficult because there is no trigger for opening. This problem can be solved by forming a notch at the opening start location, but a packaging bag that does not have a seal at the opening start location, such as a pillow bag. In this case, a notch cannot be provided at the opening start position. Further, when a notch is provided in the packaging bag, there is a possibility that the notch is opened as a trigger during transportation or display of goods.

  The present invention has been made in view of the problems of the conventional packaging bags as described above, and the object of the present invention is a packaging bag having an easy-open line without providing a notch. It is to provide a packaging bag that is easy to open.

The invention according to claim 1 is a packaging bag having at least a front surface and a back surface which is produced by bag-making a packaging material in which at least a base material layer and a sealant layer are laminated. are also easy-open lines are provided including a plurality of notches, cuts are toward the opposite ends are provided continuously and straight linear body portion, the position of the end or end side of the body portion is composed of a linear folded part is folded back Te, except at least a sealant layer, it is formed to include at least a substrate layer, in fold return part is provided two, one of the folded portions body It is provided so that it may protrude below a part, and the other folding | turning part is provided so that it may protrude above the main-body part, It is characterized by the above-mentioned.

  The packaging bag of the present invention is provided with an easy-opening line composed of a plurality of cuts as an opening means, and the cuts are connected to a linear main body part and a portion near the end of the main body part. If you try to tear at the easy opening line when opening, stress concentrates on the folded part of the notch that forms the easy opening line, so it can be opened easily without providing a notch it can.

It is a front view which shows the packaging bag of 1st Embodiment which concerns on this invention. It is a rear view of the packaging bag shown in FIG. It is an enlarged view of the notch | incision provided in the packaging bag shown in FIG. 1 and FIG. It is an expanded sectional view which shows a part of packaging material in the AA line of FIG. It is a perspective explanatory view showing a packaging bag of a second embodiment according to the present invention. It is a rear view of the packaging bag shown in FIG. It is an enlarged view which shows the modification of a notch. It is explanatory drawing which shows the modification of a packaging material. It is a front view which shows the modification of the packaging bag which concerns on this invention. It is a front view which shows the other modification of the packaging bag which concerns on this invention. It is a front view which shows the comparison form 1 of the packaging bag which concerns on this invention. It is a front view which shows the comparison form 2 of the packaging bag which concerns on this invention.

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

  The packaging bag 10 whose front side is shown in FIG. 1 and whose back side is shown in FIG. 2 is in the form of a pillow bag. This packaging bag 10 is produced by applying a winding roll of packaging material to a known automatic filling machine, and is sealed with the opposite sides facing each other in the packaging material, so that the palm seal spans from the upper side to the lower side. A portion 11 is formed on the back surface side, and the upper and lower end seal portions 12 and 13 are formed while the contents are filled in the cylindrical state in which the palm seal portion 11 is formed. The surface on the side shown in FIG. 1 (the side on which the palm seal portion 11 is not provided) is the surface 15, and the surface on the side shown in FIG. 2 (the side on which the joint seal portion 11 is provided). Is the back surface 16.

  The packaging bag 10 has an easy-open line composed of a plurality of cuts C on both the front surface side and the back surface side in a state where the bag body is slightly separated from the upper end seal portion 12 and crosses the bag body. Is provided. As shown in the enlarged view of two adjacent portions in FIG. 3, these notches C are connected to a linear main body portion Ca and a portion near the end of the main body portion Ca, and are connected to one end of the main body portion Ca. And a linear folded portion Cb that is folded from the portion side toward the other end portion side. In other words, the first embodiment has a form in which a folded portion Cb is provided at a location near one end of the main body portion Ca.

  The folded portion Cb is preferably formed so as to be included in the main body portion Ca in the direction in which the main body portion Ca extends, and is formed so as to be included from one end of the main body portion Ca to the center point of the main body portion Ca. More preferably. As for the arrangement of the cuts C, the main body portion Ca of the (n + 1) th cut C is preferably provided so as to be positioned on the extension line of the main body portion Ca of the nth cut C. For example, when the main body portion Ca is a straight line, the main body portions Ca are preferably positioned on a straight line.

  The packaging material constituting the packaging bag 10 can be, for example, a laminate in which at least the outer base material layer 1, the inner sealant layer 2, and the barrier layer 3 sandwiched therebetween are laminated. FIG. 4 shows a laminate in which the base material layer 1, the barrier layer 3, and the sealant layer 2 are laminated in this order from the outside. FIG. 4 illustrates the packaging material constituting the surface 15 of the packaging bag 10. For the base material layer 1, polyethylene terephthalate, polypropylene, polyamide, or the like can be used. For the sealant layer 2, polyethylene, polypropylene, or the like can be used. For the barrier layer 3, a metal foil such as an aluminum foil, a vapor-deposited film made of at least one of a metal, a metal oxide, and an inorganic substance is provided on a support such as polyethylene terephthalate, or an ethylene / vinyl alcohol copolymer is used. be able to. The base material layer 1 is preferably stretched, and the sealant layer 2 is preferably not stretched.

  The cut C is formed only in the base material layer 1 of the packaging material, and is not included in the sealant layer 2 and the metal foil layer 3. Such a notch C is made by using a laser, for example, a carbon dioxide laser, and irradiating the surface of the base material layer 1 to melt the surface of the base material layer 1. The type (wavelength) of the laser used for forming the cut C is selected according to the resin material of the base material layer 1 into which the cut C is put. In addition, as shown in FIG. 3, by making the folded portion Cb into a curved line, resistance against bending caused by vibration applied in the vertical direction of the bag during transportation can be maintained, and the generation of pinholes due to the cuts C can be prevented. Can be suppressed.

  With respect to the size of the notch C, the notch C is formed in a shape shown in FIG. 3, that is, the main body portion Ca is a straight line and the folded portion Cb is a curved line, for example, an arc shape, and the main body portions Ca are positioned on a straight line. In this case, as an example, the width w1 of the main body portion Ca and the width w2 of the folded portion Cb are 60 μm, the inner diameter d of the folded portion Cb is 50 μm, the length l of the main body portion Ca is 8 mm, and the interval s between the main body portion Ca and the main body portion Ca. Can be 200 μm.

  Here, the opening start work will be described. The opening operation is an operation in which the end of the packaging bag is pinched with both hands and one hand and the other hand are twisted to the opposite side.

  First, comparative example 1 shown in FIG. 11 will be described. The comparative form 1 is the same as that of the first embodiment except that the easy-open line is a cut C formed of a continuous line. When the easy-opening line is a cut C made of a continuous line, since stress is uniformly applied to the cut C when the opening operation is started, there is no starting point at which the cut C is bent. In the figure, reference numerals 52 and 53 denote end seal portions, and reference numeral 55 denotes a surface. Next, Comparative Example 2 shown in FIG. 12 will be described. The comparative form 2 is the same as that of the first embodiment except that the easy-opening line is a notch C formed of a break line, that is, the easy-opening line is composed only of the main body portion Ca of the first embodiment. In the comparative form 2, when opening operation is started, both ends of each line of the broken line become a starting point to bend, and the force is dispersed. As a result, the comparative form 2 is easier to start the opening operation than the comparative form 1. In the figure, reference numerals 62 and 63 denote end seal portions, and reference numeral 65 denotes a surface.

  Next, Embodiment 1 will be described. In the first embodiment, the easy-opening line is configured by the cut C formed of a break line, and each line of the break line has the turn-back portion Cb, so that stress is easily concentrated on the turn-back portion Cb. As a result, the first embodiment is easier to start the opening operation than the comparative example 2. Thus, when tearing along the easy-open line, the stress concentrates on the folded portion Cb of the notch C that forms the easy-open line, so that the opening can be easily started. Further, as tearing progresses, there is a continuous response of cracking at the folded portion Cb of the cut C, so that it can be felt that it can be surely broken along the easy-open line.

  5 and 6 are the same pillow bags as the packaging bag 10 shown in FIG. 1 and FIG. 2, respectively, and a seam seal portion 21 is formed on the back side, and end seals are formed on the upper and lower sides. Portions 22 and 23 are formed. 5 is the surface 25 (the side where the palm seal portion 21 is not provided), and the surface 25 is the side (the side where the palm seal portion 21 is provided). Is the back surface 26. This packaging bag 20 also has an easy-open line composed of a plurality of cuts C on both the front side and the back side in a state where the bag body is slightly separated from the upper end seal portion 22 and crosses the bag body. Although these cuts C are provided, the slits C are connected to the linear main body portion Ca, a portion near the one end portion of the main body portion Ca, and a portion near the other end portion. And a linear folded portion Cb that is folded back. In other words, the second embodiment has a form in which a folded portion Cb is provided at a location near one end of the main body portion Ca and a location near the other end.

  When opening the packaging bag 20, the end of the bag body is pinched with both hands at the position where the easy-opening line is sandwiched, and tearing is started by pulling them toward the opposite sides. Also in the second embodiment, since the cut C has the folded portion Cb, it is possible to make it easier to start the opening operation as compared with the comparative embodiment 2 as in the first embodiment. As described above, also in the second embodiment, since stress concentrates on the folded portion Cb of the notch C that forms the easy-open line, the opening can be easily started, and as the tearing progresses, the notch is notched. Since there is a crisp response one after another at the folded portions Cb at both ends of the C, it is possible to have a further real feeling that it can be surely broken along the easy-open line.

  As described above, the notch C used in the present invention is composed of the linear main body portion Ca and the folded-back portion Cb provided continuously at a position near the end of the main body portion Ca. FIG. 7 shows a modification of the slit C. Although not shown, the main body portion Ca is not limited to a straight line but may be a curved line.

  As shown in FIG. 3, the end of the folded portion Cb may be continuous with the main body portion Ca, or may be formed so as not to be continuous with the main body portion Ca as shown in FIG. Also good. Further, the folded portion Cb may be connected to the end portion of the main body portion Ca as shown in FIG.

  The folded portion Cb is not limited to a curved line, but can be a straight line as shown in FIG. Moreover, you may combine at least any one of a straight line and a curve.

  The folded portion Cb may be provided on either the upper side or the lower side of the main body portion Ca. That is, it is not limited to the one protruding downward from the main body portion Ca as shown in FIG. 3, and may be provided to protrude upward as shown in FIG. Or as shown in FIG.7 (b), you may provide so that it may protrude to both the upper side and lower side of main-body part Ca.

  As described above, the folded portion Cb may be provided at a location near one end of the main body portion Ca, or at a location near one end of the main body portion Ca and a location near the other end. Also good. In the latter case, as shown in FIG. 7E, one folded portion Cb may be provided so as to protrude below the main body portion Ca, and the other folded portion Cb may be provided so as to protrude above the main body portion Ca. .

Further, as shown in FIG. 7 (f), the folded portion Cb is formed of a curved line, and the start end of the folded portion Cb is connected to the end portion of the main body portion Ca and the end is also connected to the main body portion Ca. May be. Since it can be set as the shape which does not have a corner | angular part in the edge part of main-body part Ca, generation | occurrence | production of the pinhole resulting from the notch C can be suppressed also in the left-right direction of a bag.

  In the second embodiment, the size of one folded portion Cb may be different from that of the other folded portion Cb. For example, as shown in FIG. 7 (g), the folded portion Cb may have an arc shape, and the outer diameter of one folded portion Cb may be different from the outer diameter of the other folded portion Cb. Alternatively, although not illustrated, the shape of one folded portion Cb may be different from the shape of the other folded portion Cb.

  For example, as shown in FIG. 4, the packaging material constituting the packaging bag of the present invention can be a laminate in which at least a base material layer 1, a metal foil layer 3, and a sealant layer 2 are laminated in this order from the outer surface. . In this case, the cut C is formed only in the base material layer 1 as shown. Moreover, the packaging material which comprises the packaging bag of this invention is good also as a laminated body by which the base material layer 1 and the sealant layer 2 were laminated | stacked in order from the outer surface, as shown in FIG. Also in this case, the cut C is formed only in the base material layer 1. In any packaging material, the type (wavelength) of the carbon dioxide gas laser is selected, and the carbon dioxide laser is irradiated from the outside of the base material layer 1 so that only the base material layer 1 is melted. A notch C can be formed.

  The packaging bag of the present invention can be a three-side sealed bag, a four-side sealed bag, a standing pouch, a side gusset pouch, etc. in addition to the above-described pillow bag.

  The packaging bag 30 of FIG. 9 is a four-side seal bag. This packaging bag 30 is formed by heat-sealing a predetermined position of two overlapping front and back packaging materials to form left and right side seal portions 31, 32 and a bottom seal portion 33. The upper seal portion is formed by heat sealing after the addition. In FIG. 9, the front surface is denoted by reference numeral 35 and the back surface is denoted by reference numeral 36. And in this packaging bag 30, the notch C which has the main-body part Ca and the folding | returning part Cb as shown in FIG. An easy-open line composed of

  The packaging bag 40 of FIG. 10 is a standing pouch. The packaging bag 40 is formed by stacking two front and back packaging materials in a state where the folded bottom portion is sandwiched, and heat-sealing a predetermined position to thereby form left and right side seal portions 41, 42 and a curved bottom seal portion 43. The upper seal portion is formed by heat-sealing after the contents are introduced from the upper opening. In FIG. 10, the front surface is indicated by reference numeral 45 and the back surface is indicated by reference numeral 46. And this packaging bag 40 also has the notch C which has the main-body part Ca and the folding | returning part Cb as shown in FIG. An easy-open line composed of

  When opening these packaging bags 30 and 40, the end of the bag body is pinched with both hands at the position where the easy opening line is sandwiched, and tearing is started by pulling them toward the opposite sides. Then, since stress concentrates on the folded portion Cb of the notch C that forms the easy-opening line, the opening can be easily started, and as the tearing proceeds, the folded portion Cb at the end of the notch C can be started. By the way, since there is a continuous response with crackling, it can be felt that it can be surely broken along the easy-open line.

  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.

DESCRIPTION OF SYMBOLS 1 Outer layer 2 Sealant layer 3 Metal foil layer 10 Packaging bag (pillow bag)
11 Joint seal part 12, 13 End seal part 15 Front face 16 Back face 20 Packaging bag (pillow bag)
21 Joint seal part 22, 23 End seal part 25 Front face 26 Back face 30 Packaging bag (four-side seal bag)
31, 32 Side seal portion 33 Bottom seal portion 35 Front surface 36 Back surface 40 Packaging bag (standing pouch)
41, 42 Side seal part 43 Bottom seal part 45 Front side 46 Back side 50 Packaging bag (pillow bag)
52, 53 End seal part 55 Surface 60 Packaging bag (pillow bag)
62, 63 End seal part 65 Surface C Notch Ca Body part Cb Folded part

Claims (1)

  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 is configured by a plurality of cuts on both the front side and the back side. An easy-open line is provided, and the notch includes a linear main body portion, a linear folded portion that is connected to an end portion of the main body portion or a portion near the end portion, and is folded toward an opposite end portion. Is formed so as to include at least the base material layer except at least the sealant layer, two folded portions are provided, and one folded portion is provided so as to protrude below the main body portion, The other folded part is provided so that it may protrude above the main-body part, The packaging bag characterized by the above-mentioned.

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