JP5624724B2 - Easy-open packaging bag - Google Patents

Description

  The present invention relates to an easy-open packaging bag that is provided with a cut line so that the packaging bag can be easily opened and can be torn along the cut line by an external force applied by a consumer.

  Patent Document 1 discloses a typical easy-open packaging bag in the description of the conventional example. This conventional typical easy-open packaging bag is shown in FIG. The packaging bag 1 shown in FIG. 1 is called a “pouch”, and “flat pouch” and “standing pouch” are known as types of pouches. The pouch in FIG. 1 is a standing pouch, and has a gusset 2 at the bottom.

The pouch 1 has a cross-sectional structure composed of a plurality of layers as described in Patent Document 1. FIG. 2 is a diagram showing the same three-layer structure as FIG. Referring to FIG. 2 attached to the present specification, the pouch 1 is made of a film having a three-layer structure including an outer surface layer 3, an innermost layer 4, and an intermediate layer 5. Both inner layers 4 are bonded to the intermediate layer 5. The outer surface layer 3 is also called a barrier layer, and is made of, for example, a PET film (thickness 12 μm) on which silicon oxide is deposited . The innermost layer 4 is made of, for example, an unstretched polypropylene film (thickness: 60 μm) having heat weldability. The intermediate layer 5 is made of, for example, a nylon film (thickness 15 μm) and has a certain degree of elongation. Of course, the above-described materials constituting the layers 3 to 5 of the pouch 1 are merely examples.

  The pouch 1 is delivered from a packaging material manufacturer to a food manufacturer with both sides and bottoms heat-sealed (heat sealed). The food manufacturer fills the pouch 1 with the contents, By heat-welding (heat sealing), the pouch 1 containing the contents is sealed. The heat-welded part at both side edges of the pouch 1 is referred to as a side seal 6, the heat-welded part at the bottom is referred to as a bottom seal 7, and the heat-welded part at the top edge is referred to as a top seal 8.

  At the upper end of the pouch 1, there is a cut line 9 that extends linearly across the pouch 1. The cut line 9 is provided on the pouch 1 so that the consumer can cut it in a straight line with a relatively small force, as is also called weakening line or easy cutting line.

  Referring to FIG. 2, in the example shown in the drawing, the intermediate layer 5 is missing in the part of the cut line 9, and the part of the cut line 9 is configured by a two-layer structure of the outer surface layer 3 and the innermost layer 4. ing. And the pouch 1 has the notch 10 provided in the both ends of the cut line 9, respectively, and a consumer can open the pouch 1 along the cut line 9 by tearing the notch 10 as a clue.

As it can be seen from Figure 1, the conventional pouch 1 is typically the width w1 of the upper end portion 6a of the side seal 6 of the left and right is made larger than the width w2 of the portion 6b of the remote lower Reyo this (W1> w2). More specifically, the left and right side seals 6 are configured such that the upper end portion of the pouch 1 including the notch 10 portion is constituted by a wide heat seal portion 6a, and the lower portion of the wide heat seal portion 6a is a narrow heat seal portion 6b. It consists of

  In addition, about the structure of the cut line 9, various proposals which make the cut line 9 weaker than another site | part and ensure tearing property are seen, for example in patent document 2, 3. FIG. For example, in Patent Document 2, the outer surface layer and / or the intermediate layer is continuously or intermittently composed of a melt weakening resin layer at the site of the cut line 9 and cut by foaming a specific thermoplastic resin. Propose to form a line. Patent Document 3 proposes providing groove-shaped weakened portions in the intermediate layer and the innermost layer.

JP 2007-106497 A JP 2004-136980 A Japanese Patent Laid-Open No. 10-81341

  Since the part called the cut line 9 is a part weakened intentionally, as pointed out in Patent Document 1, pinholes may occur although it is extremely rare. Table 1 below shows the results of testing under the following conditions. In this test, when the pouch 1 containing the contents was put in an outer box and dropped in an upside down state, the presence or absence of a bent mark (hereinafter referred to as “folded mark A”) on the cut line 9 was determined. It is for confirmation. The conditions for this drop test are as follows.

For example, after putting curry food into the pouch 1 shown in FIG. 1, the upper edge portion was heat sealed. This is the same as retort foods currently available on the market, and some air is mixed in the sealed pouch 1. The pouch 1 with contents was put in an outer box and dropped onto the concrete from a height of 120 cm to verify whether or not a pinhole was generated. The pouch 1 with the outer box was dropped with the upper end part intentionally being directly below. As a verification method, 30 samples of the pouch 1 with the outer box were prepared, the dropping was repeated 10 times, the pouch 1 was taken out from the outer box every time, and whether or not a pinhole was generated in the pouch 1 was visually confirmed. . Samples with broken bags were excluded at that time and tested up to 10 drops. As a result, it was found that if there is a fold A in the cut line 9, there is a high probability that a pinhole will occur at the intersection of the cut line 9 and the fold A.

  In the above test, not only the fold mark A on the cut line 9 but also the fold mark B (FIG. 1) is seen near the step 11 at the lower end of the wide heat seal portion 6a. Even in the pouch 1 where the fold A is not seen, the fold B in the vicinity of the step portion 11 was also seen. The inventor of the present application pays attention to this phenomenon and made and tested the pouch 1 in which the step portion 11 is as close to the cut line 9 as possible. As the step portion 11 is brought closer to the cut line 9, the cut line 9 is closer to the step portion 11. As a result, it has been found that the probability of bending in the vicinity of the stepped portion 11 is reduced because the tendency to pull the possibility of bending becomes stronger. On the other hand, when the pouch 1 in which the step portion 11 was moved away from the cut line 9 was made and tested, the more the step portion 11 was moved away from the cut line 9, the more the crease B was generated in the vicinity of the step portion 11. It was found that trace A was also generated.

  In the process of verifying the results of these tests, the inventor of the present application draws the bending that is about to occur at the cut line 9 by the step 11, and the step 11 may have the pulling force. As a result of repeating the experiment, a good result was obtained, and the present invention was proposed.

  An object of the present invention is to provide an easy-open packaging bag that can suppress bending that crosses the cut line when dropped in an easy-open packaging bag having a cut line.

  It is a further object of the present invention to provide an easy-open packaging bag that can reduce the probability of pinholes occurring at cut lines that are very rare when dropped.

  Again referring to FIG. 1 of the conventional example, when the relationship between the stepped portion 11 between the wide heat seal portion 6a and the narrow heat seal 6b and the fold mark B generated in the vicinity thereof, the fold mark B is seen. Tends to occur on the side of the narrow heat seal 6b. That is, in the conventional example of FIG. 1, the fold B is generated in the lower region where the step portion 11 faces. In FIG. 1, both the fold marks A and B are drawn in the form of “<”, but it goes without saying that the forms are various.

  The inventor of the present application pays attention to the relationship between the trace B and the direction of the step portion 11 seen in the vicinity of the step portion 11, and if this step portion 11 is set to open upward, that is, facing the cut line 9, The bending that is about to occur in the cut line 9 by the step portion 11 can be drawn from the cut line 9, and this bending pulling force is obtained by arranging the step portion 11 in the vicinity of the cut line 9. It came to think that it was possible.

  FIG. 3 is a diagram for explaining the basic concept of the present invention. In FIG. 3, the same elements as those in the conventional example are denoted by the reference numerals used in FIG. The easy-open packaging bag 100 according to the present invention is configured such that the upper end portion of the side seal 6, that is, the upper end portion including the notch 10 and the cut line 9 is configured by a narrow heat seal portion 6 b, and the lower end of the narrow heat seal portion 6 b. A wide heat seal portion 6a is connected. Therefore, the step 101 constituting the boundary between the narrow heat seal portion 6b and the wide heat seal portion 6a is located below and in the vicinity of the cut line 9.

  By adopting this configuration, the step portion 101 can be positioned in the vicinity of the cut line 9 so as to face the cut line 9 upward. Then, by pulling a possible bend that is about to occur in the cut line 9 by the upward step portion 101 that is in the vicinity of the cut line 9 and that opens directly facing the cut line 9, Bending can be caused in the first region Ar (1) (FIG. 3) in the vicinity of the portion 101. Of course, if the upward stepped portion 101 is too close to the cut line 9, there is a high possibility that the cut line 9 will bend before the upward stepped portion 101 draws the bent. On the other hand, if it is too far from the cut line 9 of the upward step portion 101, the force attracting the bending that is about to occur in the cut line 9 becomes weak, and the correlation between the upward step portion 101 and the cut line 9 becomes weak. Therefore, an optimum value of the separation distance D1 between the cut line 9 and the upward stepped portion 101 is preferably obtained by experiments so that bending occurs in the first region Ar (1) in the vicinity of the stepped portion 101. .

  Incidentally, when bending occurs in the first area Ar (1) in the vicinity of the step portion 101, the film or sheet constituting the easy-open packaging bag 100 is formed in the peripheral zone Z (FIG. 3) of the cut line 9 adjacent thereto. Since the tension comes out, it is difficult for the peripheral zone Z to be bent. This can be easily understood by imagining when an elongated rubber balloon is folded in half. When an elongated rubber balloon is folded in half, at the moment, tension is applied to the rubber around the bent portion, and the rubber is stretched. Therefore, if the first region Ar (1) adjacent to the peripheral zone Z of the cut line 9 is bent, the film or sheet in the peripheral zone Z is stretched, and it is difficult for the peripheral zone Z to be bent. Become. Here, the peripheral zone Z shown in FIG. 3 is stretched on the film or sheet when subjected to an impact due to the fall, in order to prevent bag breakage such as pinholes caused by the fall of the easy-open film 100. This is the area you want.

  FIG. 4 is a diagram related to FIG. 3, in which the narrow heat seal portion 6 b constituting the upper end portion of the side seal 6 and the wide heat seal portion 6 a extending downward continuously from the lower end thereof are centered on the upward step portion 101. FIG. The upward stepped portion 101 extends vertically with respect to the side edge 102 of the easy-open packaging bag 100. If the first inner boundary line 103 of the narrow heat seal portion 6b is parallel to the side edge 102, the angle θ1 between the first inner boundary line 103 and the step portion 101 is 90 degrees (θ1 = 90 °). If the second inner boundary line 104 of the wide heat seal portion 6a is parallel to the side edge 102, the angle θ2 of the corner portion 101a between the step portion 101 and the second inner boundary line 104 is 90 in design. Degree (θ2 = 90 °). Of course, due to manufacturing problems, the corner portion 101a has a rounded round shape. Needless to say, the angles θ1 and θ2 are not limited to 90 °.

  FIG. 5 shows an example in which the angle θ1 between the first inner boundary line 103 and the upward step 101 and the angle θ2 of the corner 101a of the step 101 are both acute angles. FIG. 6 shows an example in which the angle θ1 between the first inner boundary line 103 and the upward step 101 and the angle θ2 of the corner 101a of the step 101 are both obtuse. For example, when the height of the step portion 11 is about 2 mm, the angle θ1 (θ2) is considered to be about 45 ° as a lower limit, and the upper limit is considered to be about 135 °. If the angle θ1 (θ2) is an acute angle, the first region Ar (1) where bending occurs in the vicinity of the step portion 101 tends to be limited, and if the angle θ1 (θ2) is an obtuse angle, the step portion A region Ar (1) where bending occurs in the vicinity of 101 tends to expand.

  According to the present invention, in the side seal 6, the upper end portion including the cut line 9 is constituted by the relatively narrow heat seal portion 6b, and is relatively continuous with the lower end of the narrow heat seal portion 6b. Since the step portion 101 between the wide heat seal portion 6a is opened upward, that is, facing the cut line 9, and the upward step portion 101 is located in the vicinity of the cut line 9, it is easily opened. The first region in the vicinity of the upward step portion 101 by pulling the bending as the possibility of occurring at the cut line 9 of the easy-open packaging bag 100 when the flexible packaging bag 100 is dropped upside down by the upward step portion 101 By pulling the bend to Ar (1), it is possible to suppress the bend from occurring in the peripheral zone Z including the cut line 9, and this is caused by the bend at the cut line. It is possible to reduce the probability of occurrence of pinholes that are easily generated.

  A preferable application example of the present invention is a pouch made of a sheet in which a plurality of layers are laminated, and a pouch having a cut line having a smaller number of layers than other portions. Specifically, the pouch has a three-layer structure shown in FIG. 2, and the cut line is formed by deleting an intermediate layer.

It is a front view of the conventional standing pouch. It is sectional drawing along the II-II line of FIG. It is a principal part enlarged view of the easy-open packaging bag according to this invention for demonstrating the basic concept of this invention. It is the elements on larger scale which extracted the upper left part of the left side of the easy-open packaging bag of FIG. It is the elements on larger scale which extracted the cut-line vicinity in the side seal of the easy-open packaging bag of FIG. 3, FIG. 4, and is a figure for demonstrating the acute inclination angle of an upward step part. It is a figure for demonstrating the inclination-angle of the obtuse angle of an upward step part similarly to FIG. It is a front view of the easily openable packaging bag of an Example. It is the elements on larger scale which expand and show the upper left part of FIG. It is a figure for demonstrating the crease | fold mark produced around the wide heat seal part containing the upward 1st step part and the downward 2nd step part. It is the elements on larger scale which show the modification which made the inclination of the upward 1st step part and the downward 2nd step part taper toward the inner side of a bag. It is the elements on larger scale which show the modification which made the downward 2nd step part the taper extended diagonally downward toward the inner side of a bag.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 7 shows an easy-open packaging bag 200 of the first embodiment. The easy-open packaging bag 200 of this embodiment has the same basic structure as the conventional pouch 1 described with reference to FIGS. Accordingly, the same elements as those described in the conventional pouch 1 with reference to FIGS. 1 and 2 and the elements described in the description of the basic concept of the present invention with reference to FIGS. The description is abbreviate | omitted by attaching | subjecting a reference code.

  The easy-open packaging bag 200 of the first embodiment is a standing pouch provided with gusset 2, but may be a flat pouch without gusset 2 as a modification.

  The easy-open packaging bag or standing pouch 200 of the first embodiment has a height H of 165 mm and a width W of 130 mm as described in FIG. Such a pouch is generally sold in an outer box. Moreover, generally it has a left-right symmetric form so that FIG. 7 may show. The cut line 9 is provided 25 to 30 mm below the upper edge 105 of the pouch 200.

  The standing pouch 200 according to the first embodiment is characterized by the side seal 6, and the side seal 6 is continuous with the narrow heat seal portion 6 b located at the upper end portion thereof and the lower end of the narrow heat seal portion 6 b. The wide heat seal portion 6a extending downward is the same as the basic concept of the present invention (FIG. 3) described above, but is additionally provided to extend downward continuously from the lower end of the wide heat seal portion 6a. A narrow heat seal portion 6b is provided. The narrow heat seal portion located at the upper end of the standing pouch 200 is referred to as “upper narrow heat seal portion 6b (1)”, and the narrow heat seal portion located at the lower portion of the standing pouch 200 is referred to as “lower narrow heat seal portion”. By calling the portion 6b (2) ", the narrow heat seal portion 6b positioned above and below the wide heat seal portion 6a is distinguished.

In the easy-open packaging bag 200 of the first embodiment, the width w2 (1) of the upper narrow heat seal portion 6b (1) and the width w2 (2) of the lower narrow heat seal portion 6b (2) are the same. The width w2 (1) of the upper narrow heat seal portion 6b (1) may be different from the width w2 (2) of the lower narrow heat seal portion 6b (2). In this case, the upper width The width w2 (1) of the narrow heat seal portion 6b (1) is made larger than the width w2 (2) of the lower narrow heat seal portion 6b (2) in order to improve the sealing performance of the notch 10 portion. preferable. Of course, the width w2 (1) of the upper narrow heat seal portion 6b (1) is smaller than the width w1 of the wide heat seal portion 6a located below the cut line 9 (width w1> width w2 (1)) . The design dimensions of each of the widths w1, w2 (1), w2 (2) are such that the width w1 of the wide heat seal portion 6a is 7 to 8 mm, and the upper and lower narrow heat seal portions 6b (1), 6b. The widths w2 (1) and w2 (2) of (2) are 5 to 6 mm. Therefore, the height of the step portion 101 is 2 mm.

  FIG. 8 is a partially enlarged view of an extracted upper end portion of the easy-open packaging bag 200 of the first embodiment. From FIG. 8, firstly, the portion of the cut line 9 including the notch 10 is constituted by a relatively narrow heat seal portion 6b (1) unlike the conventional case, and secondly, the notch 10 And the point comprised by the heat seal part 6a comparatively wide in the vicinity of the cut line 10 and the downward | lower direction, 3rd, it connects to the lower end of this wide heat seal part 6a, and the heat seal part 6b relatively narrow. You can clearly see that (2) extends downward. Further, with such a configuration, an upward first step portion 101 (1) is formed at the upper end of the wide heat seal portion 6a, and a downward second step portion 101 (2) is formed at the lower end of the wide heat seal portion 6a. As can be seen from FIG.

  First and second step portions 101 (1) and 101 (2) are formed above and below by the wide heat seal portion 6a having a finite length D2, and thereby the first upward step portion 101 (1 ) And the second region Ar (2) near the second downward step 101 (2), the third region Ar ( Three regions 3) are formed below the peripheral zone Z.

  When an external force indicated by an arrow F is applied to the upper edge 105 by dropping the easy-open packaging bag 200 containing the contents in an outer box (not shown) in an upside down state, the upward first step 101 The bending is attracted by (1), and there is a high probability that the bending will occur in the first region Ar (1) in the vicinity of the upward first step portion 101 (1) in the vicinity of the peripheral zone Z. For example, when bending does not occur in the first region Ar (1), the downward second step portion 101 (2) may function as a backup, and in the vicinity of the second step portion 101 (2). It is desirable that the second region Ar (2) bend. Therefore, the separation distance (distance D1 + D2 in FIG. 8) between the downward second step portion 101 (2) and the cut line 9 is important. That is, when bending does not occur in the first region Ar (1), the bending is caused in the second region Ar (2) by pulling the bending in the downward second step portion 101 (2), and thereby the peripheral zone It is desirable to set the above (D1 + D2) to a distance that can give tension to Z.

  The distance D2 is the vertical length of the wide heat seal portion 6a, but no bending occurs in the first region Ar (1) or no bending occurs in the second region Ar (2). In addition, there is a possibility that the bending as the possibility flows into the third region Ar (3) in the vicinity of the wide heat seal portion 6a and the bending occurs in the third region Ar (3). That is, a bend that is likely to occur in the first region Ar (1) and a bend that is likely to occur in the second region Ar (2) flow into the third region Ar (3), Bending may occur in the third region Ar (3).

  Therefore, by setting the distance D2 that is the vertical length of the wide heat seal portion 6a to an appropriate length, when the first region Ar (1) is not bent, the downward second step portion 101 (2 ) Can increase the probability of occurrence of bending in the second region Ar (2) and the third region Ar (3). As described above, the first and second step portions 101 (1), 101 (101), 101 (101), 101 (101), 101 (101), 101 (101), 101 (101), 101 (101), 101 (101), 101 (101) By generating the bend in the first to third regions Ar (1) to Ar (3) by the bend pulling force according to (2), the probability of the bend occurring at the cut line 9 can be lowered. To explain this with reference to FIG. 9, it is the first meaning that the upward first step portion 101 (1) induces bending in the first region Ar (1) in the vicinity thereof. If the bending does not occur in the first region Ar (1), the second and third regions Ar (2) and Ar (3) can be prepared by the second step portion 101 (2) as a backup.

  Here, B1 indicates the first fold caused by the bending and pulling force of the upward first step portion 101 (1), and the second region Ar by the bending and pulling force of the downward second step portion 101 (2). B2 indicates the second fold caused by the bending generated in (2), and B3 indicates the third fold caused by the bending of the third region flowing from the first and second regions Ar (1) and Ar (2). It is shown by.

  In order to confirm how the folds of the easy-open packaging bag 200 of the first embodiment described above are attached, the separation distance between the cut line 9 and the upward first step portion 101 (1) shown in FIG. Five types of easy-open packaging bags 100 in which D1 and the distance D2, which is the length dimension of the wide heat seal portion 6a, were made and actually subjected to a drop test.

  The first type had a separation distance D1 = 5 mm and a length D2 = 15 mm. The second type had a separation distance D1 = 10 mm and a length D2 = 15 mm. The third type had a separation distance D1 = 15 mm and a length D2 = 15 mm. In the fourth type, the separation distance D1 = 5 mm and the length D2 = 20 mm. The fifth type had a separation distance D1 = 5 mm and a length D2 = 10 mm.

  In this easy-open packaging bag 100, the separation distance D3 (FIG. 4) from the upper edge 105 to the cut line 9 is 25 mm, so the first type separation distance D1 = 5 mm is 20% of the separation distance D3 = 25 mm. It corresponds to. That is, it is the first type that the center wide heat seal portion 6a is installed at a position where the distance from the upper edge 105 to the cut line 9 is extended by 20%. In addition, since the first type has a length D2 = 15 mm, the length D2 of the central wide heat seal portion 6a is a separation distance (25 + 5) from the upper edge 105 to the central wide heat seal portion 6a beyond the cut line 9. = 50 mm of 30 mm).

  Similarly, since the second type is the separation distance D1 = 10 mm, it is the second type that the center wide heat seal portion 6a is installed at a position where the distance from the upper edge 105 to the cut line 9 is extended by 40%. Become. Further, since the second type has a length D2 = 15 mm, the length D2 of the center wide heat seal portion 6a is a separation distance (25 + 10) from the upper edge 105 to the center wide heat seal portion 6a beyond the cut line 9. = 43 mm of 35 mm).

  Similarly, since the third type has a separation distance D1 = 15 mm, it is the third type that the center wide heat seal portion 6a is installed at a position where the distance from the upper edge 105 to the cut line 9 is extended by 60%. Become. In addition, since the third type has a length D2 = 15 mm, the length D2 of the center wide heat seal portion 6a is a separation distance (25 + 15) from the upper end edge 105 to the center wide heat seal portion 6a beyond the cut line 9. = 38mm) = 40mm).

  Similarly, since the fourth type is the separation distance D1 = 5 mm, it is the fourth type that the center wide heat seal portion 6a is installed at a position where the distance from the upper edge 105 to the cut line 9 is extended by 20%. Become. In addition, since the fourth type has a length D2 = 20 mm, the length D2 of the center wide heat seal portion 6a is a separation distance (25 + 5) from the upper edge 105 to the center wide heat seal portion 6a beyond the cut line 9. = 67 mm) = 30 mm).

  Similarly, since the fifth type has a separation distance D1 = 5 mm, the central wide heat seal portion 6a is installed at a position where the separation distance from the upper edge 105 to the cut line 9 is extended by 20%, as in the fourth type. This is the fifth type. Further, since the fifth type has a length D2 = 10 mm, the length D2 of the center wide heat seal portion 6a is a separation distance (25 + 5) from the upper edge 105 to the center wide heat seal portion 6a beyond the cut line 9. That is about 33% of 30 mm).

  In the first to fifth types, the extension ratio of the extent to which the distance from the upper edge 105 to the cut line 9 is extended and the central wide heat seal portion 6a is positioned, and the length of the central wide heat seal portion 6a Table 2 below shows a list of the ratios of the distance from the upper edge 105 to the center wide heat seal portion 6a beyond the cut line 9.

  The following Table 3 shows the result of verifying the fold marks seen in the pouch 100 with the contents by performing a drop test so that the upper end portion is directly below as described in the conventional example with reference to FIG.

  In the pouch 200 of the example, three types of fold marks B1 to B3 could be confirmed. The first fold B1 is seen in the first region Ar (1) in the vicinity of the upward first step 101 (1), and the second fold B2 is the upper and lower first and second steps 101 ( 1) It was found in the middle region of (2), that is, the second region Ar (2) in the vicinity of the wide heat seal 6a, and the third fold B3 was found in the vicinity of the downward second step portion 101 (2). .

  Referring to Table 3 above, five bags of various types of pouches 200 were prepared, and tests were performed on each bag. For example, when looking at the first type of the first bag column, a value of “40-42 mm” is seen, but the left “40 mm” is in the vicinity of the left side seal 6 of the pouch 200 and the upper end of the pouch 200. It means a separation distance from 105 to the position of the fold mark B (here, B1, B2, and B3 are not distinguished). “42 mm” on the right means that a crease B is seen in the vicinity of the right side seal 6 of the pouch 200 and at a position 42 mm from the upper end 105 of the pouch 200. That is, in the first bag of the first type, a fold B is seen at a position 40 mm below the upper edge 105 on the left side of the bag 100, and a fold B at a position 42 mm below the upper edge 105 on the right side. It means that was seen. The second type “37 / 55-43 mm” of the second type is near the side seal 6 on the left side of the pouch 200, and there are fold marks B at two locations, 37 mm and 55 mm from the upper end 105 of the pouch 200. As can be seen, on the right side of the pouch 200, it means that a fold B is seen at a position 43 mm from the upper end 105 of the pouch 200.

  As described above, in the easy-open packaging bag 200 of the example, the fold A (FIG. 1) is not seen in the cut line 9 as in the conventional case, and the folds B1 to B3 are generated below the cut line 9. I was able to confirm that. Moreover, it has confirmed that the bending of the cut line 9 could be suppressed by the configuration of the easy-open packaging bag 200 of the example.

  As another test, an easy-open packaging bag 200 of an example of D1 = 8 mm and D2 = 19 mm was prepared, and after putting the contents, it was sealed and a drop test was performed. For comparison, a drop test was also performed on the conventional example of FIG. Furthermore, for comparison, an easy-open packaging bag with a linear side seal (width 5 mm) was made from the top to the bottom, and similarly, a drop test was performed so that the upper end portion was directly below. The test results are shown in Table 4 below.

  In Table 4 above, “CL white” means that a fold A (FIG. 1) was seen in the cut line 9, and pinholes may have occurred. Further, as can be seen from the above results, the probability that the fold A (FIG. 1) occurs in the cut line 9 is 6/10 in the straight side seal bag, whereas In the conventional example of FIG. 1, it occurs with a probability of 4/10. On the other hand, in the first example (D1 = 8 mm, D2 = 19 mm), the probability is 1/10, and it has been found that the probability of bending on the cut line 9 can be greatly reduced. In the column of the example in Table 4, for example, “32-35, 51” is written in the third bag, which is 32 mm below the upper edge 105 on the left side of the easy-open packaging bag 200. This means that the fold B is seen at the location, and on the right side of the bag 200, the crease B is seen at two locations of 35 mm and 50 mm downward from the upper edge 105.

  In addition, Table 5 shows the test results obtained by making 30 bags as the number of individuals of the conventional example and the example of FIG.

  In the conventional example, in the fourth drop test, fold marks A (FIG. 1) were observed on the cut line 9 in 4 of the 30 bags. In the fifth drop test, fold A (FIG. 1) was found on the cut line 9 in 3 of the 26 bags. In contrast, in the example, only the fold A (FIG. 1) on the cut line 9 was seen in one of the 30 bags at the seventh time.

  As described above, a relatively narrow side seal portion 6b is provided at the upper end portion including the cut line 9, and a relatively wide side seal portion 6a is provided near and below the cut line 9, thereby allowing easy opening. It was confirmed that there is an effect that the probability that the bending occurs in the cut line 9 can be greatly reduced by inducing the bending associated with the dropping of the packaging bag 200 below the cutting line 9 and in the vicinity of the cutting line 9.

  10 and 11 show a modification of the easy-open packaging bag 200 of the first embodiment. FIG. 10 shows an upward first step portion 101 (1) and a downward second step portion 101 (2). Both show the example which made it incline toward the inner side of the bag 200, and made the wide heat seal part 6a into the trapezoid form. FIG. 11 shows an example in which the downward second step portion 101 (2) extends downward.

  As mentioned above, although the Example of this invention was described based on the example whose part of the cut line 9 is a two-layer structure (FIG. 2), the easy-open packaging bag by which the cut line 9 is weakened rather than another site | part. In contrast, by applying the present invention, it is possible to suppress bending at the cut line 9, thereby reducing the probability of occurrence of problems such as pinholes at the cut line 9.

  Moreover, although the typical pouch 200 was demonstrated to the example as an Example of this invention, in the case of the easily openable packaging bag which is not marketed by the exterior box, it exists in the tendency which sets the width | variety of the side seal 6 large. When the width w1 of the narrow heat seal portion 6b is larger than 5 to 6 mm, or when the width w2 of the wide heat seal portion 6a is larger than 7 to 8 mm, or when the height of the stepped portion 101 is larger than 2 mm, It is preferable to set the separation distance D1 between the cut line 9 and the first step portion 101 (1) to be relatively large. Of course, depending on the size of the pouch, it is preferable to set the separation distance D1 between the cut line 9 and the first step portion 101 (1) to an appropriate length, which is larger than the above-mentioned D1 = 15 mm. There may be cases where it is optimal.

  Further, the separation distance D3 between the upper edge 105 of the pouch and the cut line 9 is 25 to 30 mm in the embodiment. For example, it is also possible to provide a cut line in the upper and lower intermediate portions of the easy-open packaging bag. In this case, the present invention may be applied to the upper and lower sides of the cut line 9, or the present invention may be applied to the side to be cut and discarded by the cut line 9.

100 Easy-open packaging bag according to the present invention 200 Easy-open packaging bag of Example 3 Outer surface layer 4 Innermost layer 5 Intermediate layer 6 Side seal 6a Wide heat seal part 6b (1) Upper narrow heat seal part 6b (2) Lower heat seal part 9 Cut line 10 Notch 101 (1) Upward step part of wide heat seal part 101 (2) Upward step part of wide heat seal part 102 Side edge of pouch 105 Upper edge of pouch

Claims (5)

A side seal thermally welded to the left and right side edges, and a cut line consisting of a weakening line extending linearly between the left and right side seals at a height position below a predetermined distance from the upper ends of the left and right side seals. Prepared,
The right and left ends of the cut line are formed with notches formed by cutting out the edges of the left and right side seals. And
The side seal includes a wide seal portion having a first step portion that opens facing the cut line,
The lower side of the first step portion in the side seal is composed of the wide seal portion,
The upper side of the first step portion in the side seal is composed of a first narrow seal portion narrower than the wide seal portion,
The first step portion of the wide seal portion is positioned in the vicinity of the cut line, and a first region that draws a bend is formed between a peripheral zone around the cut line and the first step portion. Easy-open packaging bag characterized by The side seal has a second narrow seal portion having a relatively narrow width below the wide seal portion;
A second region that draws a bend that may occur when dropped in the vicinity of the second step portion that opposes the first step portion of the wide seal portion;
The first, the second region, a third region in which the flows are the bending of the possibly in the vicinity of the wide sealing portion bent is generated is formed, peelable according to claim 1 Packaging bag.   The easy-open package according to claim 1 or 2, wherein the easy-open packaging bag is made of a film having at least a three-layer structure, and the cut line is formed by missing an intermediate layer of the film. Sex packaging bag.   The easily openable packaging bag according to any one of claims 1 to 3, wherein a separation distance between the first step portion and the cut line is 5 to 15 mm.   The easy-open packaging bag according to claim 4, wherein the wide seal portion has a length of 10 to 20 mm.

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