JP6277738B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag which can be opened by tearing by hand.

  Packaging bags made of laminated films are used for packaging seasonings, foods, refill detergents, and the like. In order to open this type of packaging bag, a bag or a cutter is used, but in recent years, many items can be opened by tearing by hand without using such a tool.

  An example of such means for opening a packaging bag is described in Patent Document 1. That is, in a self-supporting bag formed of a laminated film, a plurality of half-cut lines are provided in parallel at an injection port portion whose peripheral portion is fused and sealed. The half cut line extends linearly from the seal part on one side to the seal part on the opposite side across the non-fused part so as to cross the injection port part.

  This document also describes providing a half-cut line that obliquely intersects a plurality of parallel half-cut lines. According to this document, when the sealant layer of the laminated film is stretched and torn and the tear line deviates from the central half-cut line, it is taken over by the adjacent half-cut line, or the central half-cut line. It is said that the injection port can be opened by tearing it cleanly.

Japanese Patent No. 4612391

  When the packaging bag is torn along the opening guide line such as a half-cut line, the packaging bag becomes difficult to tear along the way, and it may not be able to be torn further by normal force. When the present inventor examined this problem based on experiments, the following was found.

  A) When the packaging bag is torn along the opening guide line from the opening starting point, a tear enters the non-fused part where the films are not fused from the opening starting point side, and the tip of the tear opens. The tear strength (tear resistance) of the packaging bag may suddenly increase when it reaches the end-point side seal.

  B) The tear strength increases sharply in the direction perpendicular to the opening guide line (for example, up and down) when the leading ends of the respective non-fused portions of the packaging bag reach the sealing portion on the opening end point side. It is a case that is greatly deviated. In that case, since it is necessary to tear the space between the tears of the packaging bag, the tear strength increases rapidly. As will be clarified later based on experiments, when the deviation is 1 mm or more, the tear strength may be 10 N or more.

  C) The phenomenon in which the tear of the opposite non-fused part is shifted in the direction perpendicular to the opening guide line is that when both sides of the opening point of the packaging bag are pinched with the fingertips and teared, the one side is the other side. It tends to occur when the shape is twisted toward (see the two-dot chain line in FIG. 5).

  In other words, when the packaging bag is twisted, the position to which the tearing force is applied tends to shift in the direction perpendicular to the opening guide line in each non-fused portion opposite to the packaging bag, or the reverse direction perpendicular to the opening guide line. It becomes easy to apply force. As a result, the tears at the respective non-fused portions are shifted.

  D) Therefore, even if an oblique half-cut line intersecting the parallel half-cut line is provided, if the packaging bag is torn as described above, until the tear reaches the seal at the opening end point side Since the force that shifts the tear acts on each of the non-fused portions facing each other, the tear is greatly displaced at the time of arrival.

  Then, this invention makes it a subject to suppress the shift | offset | difference of the tear of each non-fused part which opposes as mentioned above, and to improve the openability by tearing of a packaging bag.

  In order to solve the above-mentioned problems, the present invention provides an opening guide line (also referred to as “opening auxiliary line”, which is the same hereinafter) extending from the opening start point side to the opening end point side of the packaging bag. An opening guide wire that reduces the amount of shift of the tear was combined. This will be specifically described below.

The packaging bag presented here has a seal part in which the peripheral parts of both opposing films are overlapped and fused,
A plurality of juxtaposed plural non-fused portions of the two films that are not fused to each other extend from the opening start point side for tearing and opening the packaging bag toward the seal portion on the opening end point side. 1 opening guide wire,
At the unsealing end side of each of the opposing non-fused portions of the two films, so as to approach each other from both outer sides of the plurality of first opening guide lines arranged side by side toward the sealing portion on the unsealing end side. Two second opening guide lines extending ;
A third opening guide line from the second opening guide line of each of the opposed non-fused parts to the seal part on the opening end point side,
The two second unsealing guide lines of each of the opposed non-fused portions intersect at one point on the unsealing end point side, and the intersecting points of the second unsealed guide lines of each of the opposed non-fused portions are relative to each other. The one third opening guide line reaches the seal part on the opening end side from the intersection of the second opening guide lines, and the third opening guide lines of each of the opposing films are opposed to each other,
Only the third opening guide line is provided as the opening guide line on the opening end point side from the two second opening guide lines of each of the opposing films .

  In such a packaging bag, when a tearing force is applied to the opening start point side, the force concentrates on one of the plurality of first opening guide lines at each non-fused portion facing the packaging bag, Each non-fusion part is torn along the first opening guide line. Since a plurality of first opening guide lines are provided, opening is guided by any of the first opening guide lines even if the position where the tearing force is applied is slightly deviated from the planned opening start point. Therefore, it becomes easy to tear open the packaging bag.

  When the leading end of the tear in each of the opposed non-fused parts reaches the vicinity of the seal part on the opening end point side, the tear moves from the first opening guide line to the second opening guide line. Since the two second opening guide lines extend from both outer sides of the plurality of first opening guide lines toward the seal part on the opening end point side, the tears have a plurality of first opening guide lines. Regardless of the line, the tear will be transferred to the second opening guide line. Since the two second opening guide lines extend so as to approach each other as described above, a tear extends toward one point in the extending direction of the two second opening guide lines. .

  Therefore, even when the positions of the tears of the respective non-fused portions facing each other are shifted at the time of guiding the opening by the first opening guide line (shifted in the direction orthogonal to the first opening guide line), the second opening guide line When the opening instruction is taken over, the positional deviation is reduced. Therefore, a rapid increase in tear strength when reaching the seal portion from the non-fused portion is suppressed, and it becomes easy to tear the packaging bag to the end and open it.

In the two second opening guide wire of the previous SL opposite unfused portion each said opening end point intersect at one point, and the against the intersection between the second opening guide wire opposing unfused portions each phase Tei Ru. For this reason, it is advantageous in reducing the positional deviation of the tears at the respective non-fused portions.

That comprise a third opening guide wire to reach the sealing portion of the opening end point from the intersection of the pre-Symbol opposite unfused portion each of said second opening guide wire. As a result, in the state where the positional deviation of the tears of the respective non-fused portions facing each other is reduced, the opening can be guided to the seal portion on the opening end point side by the third opening guide line, and the packaging bag is torn to the end and opened. It will be easier to do.

According to the present invention, each of the non-fused portions of the packaging bag is provided with a plurality of first opening guide wires arranged in parallel extending from the unsealing start point side toward the seal portion on the unsealing end point side, and unsealing of each non-fused portion. Two second opening guide lines extending from both outer sides of the plurality of first opening guide lines arranged side by side on the end point side so as to approach each other toward the seal part on the opening end point side and intersecting at one point Provided , and only one third opening guide line from the intersection of the second opening guide lines to the seal part on the opening end side as an opening guide line on the opening end side from the two second opening guide lines. Since the third opening guide line of each of the opposing films is opposed to each other, the opening position of the tear of each of the non-fused portions is the first opening when the opening is induced by the first opening guide line. Even if it is shifted in the direction perpendicular to the guide wire, the second open guide wire Positional deviation is induced opening to be smaller, while reducing the positional deviation by a second opening guide wire, it can induce opening the seal portion of the opening end point by a third opening guide wire of one Therefore, the rapid increase in tear strength when reaching the seal portion from the non-fused portion is suppressed, and it becomes easy to tear and open the packaging bag to the end.

It is a front view of the packaging bag which concerns on embodiment of this invention. It is a front view which shows the injection inlet part of the packaging bag. It is a front view which shows the inlet part of the packaging bag which concerns on the reference example with which it used for the tear test 1. FIG. It is a front view which shows the inlet part of the packaging bag which concerns on the comparative example with which the test 1 was provided. It is a front view which shows the state which opened the inlet part of the packaging bag which concerns on a comparative example to the middle. It is a graph which shows a tear test result. It is a front view which shows the inlet part of the packaging bag which concerns on the reference example with which it used for the tear test 2. FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its application, or its use.

<Overall configuration>
A packaging bag 1 shown in FIG. 1 is a self-supporting packaging bag that contains the contents for bottle refilling produced by a laminated film having a sealant layer. The packaging bag 1 includes a film 2 and a bottom film 3 on opposite sides. The bottom film 3 is mountain-folded so that the sealant layer is on the outside (so that the crease is on the top) and inserted between the front and back films 2. And the both sides | sides part with which the film 2 of the front and back was piled up, and each of the film 2 of the front and back and the bottom side part with which the bottom film 3 were piled up are each sealed by fusion | fusion. The seal portions 4 on both sides of the front and back films 2 are connected to the lower seal portion 5 with respect to the bottom film 3 of the front and back films 2.

  An inlet 7 that communicates with the bag main body 6 that stores the contents and projects obliquely upward is formed at the corner portion on the upper side of the packaging bag 1. The upper end 9 of the bag body 6 is open for filling the contents. The injection port portion 7 is sealed by fusing the front and back films 2 at the periphery except for the portion communicating with the bag main body portion 6. Easy opening means for tearing and opening the packaging bag 1 at the inlet 7 is provided at the site of the inlet 7. This will be specifically described below.

<Easy opening means>
As shown in FIG. 2, a knob portion 8 formed by fusing the front and back films 2 is provided above the inlet portion 7. This knob portion 8 is for the user to pinch when opening. A notch 12 serving as an opening start point is formed in a seal portion 11 on one side (in the present embodiment, the bag center side) of the inlet portion 7. In order to facilitate tearing and unsealing of the packaging bag 1, each of the front and back films 2 forming the injection port 7 has a plurality of juxtaposed first opening guide wires 13 and two A second opening guide line 14 is formed, and one third opening guide line 15 is formed.

  Each of the plurality of first opening guide lines 13 has a fusion part on the opposite side across the non-fusion part 16 facing the seal part 11 on the opening start point side of the inlet 7, that is, a seal part 17 on the opening end point side. It extends in parallel toward. Each of the first opening guide lines 13 traverses the seal portion 11 on the opening start point side and continues linearly from the seal portion 11 to the non-fused portion 16.

  The two second opening guide lines 14 are provided on the opening end point side in the respective non-fused portions 16 facing each other. The two second opening guide lines 14 extend linearly so as to approach each other from both outer sides of the plurality of first opening guide lines 13 arranged side by side toward the seal portion 17 on the opening end point side. Yes. The two second opening guide lines 14 of the present embodiment intersect with each other in a V shape at one point P on the opening end point side. The intersections P of the second opening guide lines of the opposing non-fused parts 16 are opposed to each other immediately before the sealing part 17 on the opening end point side, that is, overlap each other when the packaging bag 1 is viewed from the front and back. It is provided in a positional relationship.

  The third opening guide line 15 extends linearly to the outer edge of the seal part 17 across the seal part 17 on the opening end side from the intersection P of the second opening guide line. The third opening guide lines 15 of the front and back films 2 are opposed to each other, that is, provided in a positional relationship where they overlap each other when the packaging bag 1 is viewed from the front and back.

  The number of the first opening guide lines 13 can be arbitrarily set as long as there is an effect of improving the tear opening property. Although it does not limit, in the preferred embodiment, the three first opening guide wires 13 are arranged in parallel with an interval of 0.2 to 1.5 mm. Similarly, although not limiting, the two second opening guide wires 14 are provided in a range of 0 to 20 mm from the end edge of the non-fused portion 16 on the opening end point side toward the opening start point side. This is advantageous for suppressing a rapid increase in tear strength immediately before the seal portion. The angle formed by the first opening guide line 13 and the second opening guide line 14 is 70 degrees or less. Thereby, the guidance of opening from the first opening guide line 13 to the second opening guide line 14 when the injection port portion 7 is torn is smoothed.

  In the example shown in FIG. 2, the center first opening guide line 13 among the three first opening guide lines 13 intersects the intersection P of the second opening guide lines 14, and the center first opening guide line 13 and The third opening guide line 15 is arranged on a straight line.

  The 1st thru | or 3rd opening guide lines 13-15 should just have the function which guide | induces (regulates) the tearing direction of the film 2 of the front and back. For example, a groove formed in the film 2 by so-called half-cut processing becomes a fragile and easy-to-break opening guide line. Alternatively, when two beads are arranged side by side, a groove between the beads can serve as an opening guide line that guides the tearing direction. For the half-cut processing, for example, laser processing, electric discharge processing, machining, thermal processing, or the like can be used.

<Tear test 1>
-Reference example-
A packaging bag having an inlet 7 according to the reference example shown in FIG. 3 was prepared. This packaging bag is made of a laminated film of PET film GL-AECF (thickness 12 μm), NY film (nylon, thickness 15 μm) and LLDPE film (sealant layer, thickness 80 μm) manufactured by Toppan Printing Co., Ltd. As in the above-described embodiment, the knob portion 8 and the notch 12 serving as the opening start point are provided. The width W of the seal part 17 on the unsealing end point side is 3.5 mm. Each of the front and back films 2 forming the injection port portion 7 is formed with three parallel first opening guide lines 13 and two second opening guide lines 14 intersecting in a V shape. Note that the third opening guide line is not formed. The opening guide lines 13 and 14 were formed by half-cutting (cutting a PET film and NY film) of the front and back films 2 with a carbon dioxide laser.

 The three first opening guide lines 13 continuously extend from the seal part 11 on the opening start point side over a range of about 4/5 of the length in the tear direction of the non-fused part 16. The two second opening guide wires 14 are provided in the remaining range of about 1/5 (5 to 6 mm) of the length in the tear direction of the non-fused portion 16. The three first opening guide lines 13 are provided at a pitch of 1.5 mm, and the central first opening guide line 13 among the three extends from the tip position of the notch 12 toward the opening end point side.

  The distance between the two second opening guide lines 14 becomes narrower as they approach the opening end point and intersects at the intersection point P, and the interval at the opening start point side that is the widest is 5 mm. The angle formed by the first opening guide line 13 and the second opening guide line 14 is about 45 degrees. Further, each of the three first opening guide lines 13 and the second opening guide line 14 are separated from each other with a minute gap in the tearing direction.

-Comparative example-
A packaging bag (Comparative Example A) having an inlet 7 shown in FIG. 4 was prepared. This packaging bag was made with a laminate film of PET film GL-AECF (thickness 12 μm), easy-cut film ONY (stretched nylon, thickness 15 μm) and LLDPE film (sealant layer, thickness 80 μm) manufactured by Toppan Printing Co., Ltd. As in the above-described embodiment, the knob portion 8 and the notch 12 serving as the opening start point are provided. The width W of the seal part 17 on the unsealing end point side is 3.5 mm. In addition, a packaging bag having a width W of 2.0 mm by cutting the sealing portion 17 on the unsealing end side at the position indicated by the alternate long and short dash line in FIG. In Comparative Examples A and B, since the easy-cut film ONY is used, no opening guide line is formed.

-Tear test-
The inlet part 7 was torn from the notch 12 by pinching the knob part 8 of each packaging bag of the reference example and the comparative example. Then, as shown in FIG. 5, when the tear of the film 2 on the front and back reaches the seal portion 17 on the unsealing end side, the shift dimension X and the tear strength (peak strength) Y of the tear tip of the film 2 on the front and back I investigated the relationship.

Here, in the case of the comparative example, when a tearing force is applied by twisting the knob portion 8 downward as shown by a two-dot chain line in FIG. 5, the displacement dimension X increases, and the displacement dimension X increases as the twist degree increases. Became larger. On the other hand, in the case of the reference example, even when the twist degree was changed, the deviation dimension X at the time when the tear reached the seal portion 17 was hardly changed and was 0.5 mm or less.

The results are shown in FIG. According to the figure, there is a strong correlation between the displacement dimension X and the tear strength Y. According to Comparative Examples A and B, the width W of the seal portion 17 on the opening end side is different between 2.0 mm and 3.5 mm. However, the tear strength Y is hardly changed (the tear strength does not depend on the width W), the tear strength Y is 10 N or more when the displacement dimension X is 1 mm or more, and in the reference example, It can be seen that there is almost no deviation of the crack tip of the film 2 and that the tear strength Y is 5 N or less (tearing and tearing is easy). The regression equation obtained by the least square method was Y = 6.6X + 2.9.

<Tear test 2>
As shown in FIG. 7, a packaging bag according to a reference example in which two parallel first opening guide lines 13 and two second opening guide lines 14 intersecting at an intersection point P are provided in the inlet 7 is a test material. It was. And the influence which the distance L of the front-end | tip position of the notch 12 where stress concentrates when tearing and opening the injection port part 7 and the 1st opening guide line 13 (laser processing start position) has on the induction | guidance | derivation of opening was investigated. The results are shown in Table 1.

  According to Table 1, when the pitch D (= 2 × L) for providing the first opening guide wire 13 exceeds 2.0 mm, the opening is not guided from the notch 12 to the first opening guide wire 13, and the pitch D is 0. When the thickness is less than or equal to 8 mm, the guidance for opening is improved. Therefore, in consideration of the opening guide function when the power point at the start of tearing deviates from the first opening guide line 13, the pitch D is preferably 2 mm or less, and more preferably 0.8 mm or less. Recognize. However, if the pitch D is set to 0.2 mm or less, the processing is likely to interfere with the adjacent first opening guide wires 13. Therefore, it can be said that the pitch D is preferably 0.2 mm or more and 2.0 mm or less, and more preferably 0.2 mm or more and 0.8 mm or less.

<Others>
The relationship between the first opening guide line 13 and the second opening guide line 14 is not limited to the examples shown in FIGS. 2, 3, and 7, and all of the first opening guide lines 13 are the second opening. The guide wire 14 may be crossed. Further, the number of first opening guide wires 13 may be four or more. Moreover, you may make it add a 3rd opening guide line in the example shown in FIG.3 and FIG.7, and can take a various aspect.

  Further, each of the plurality of first opening guide lines 13 is not necessarily a continuous line, and may be formed in a broken line shape at a predetermined pitch.

  Further, the form of the packaging bag is not limited to the embodiment, and the present invention can be applied to various forms of packaging bags, such as a case where the upper end of a rectangular packaging bag is opened over the entire width. it can.

  The laminated film for making a packaging bag may be a laminate of a resin film and a film other than resin such as aluminum foil or paper. Alternatively, the packaging bag may be a bag made of a single layer resin film.

DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Front and back film 3 Bottom film 7 Inlet part 8 Knob part 11 Sealing part on the opening start side 12 Notch 13 First opening guide line 14 Second opening guide line 15 Third opening guide line 16 Non-fusion part 17 Sealing part at the end of opening

Claims (1)

A packaging bag having a seal portion in which the peripheral portions of both opposing films are overlapped and fused,
A plurality of juxtaposed plural non-fused portions of the two films that are not fused to each other extend from the opening start point side for tearing and opening the packaging bag toward the seal portion on the opening end point side. 1 opening guide wire,
At the unsealing end side of each of the opposing non-fused portions of the two films, so as to approach each other from both outer sides of the plurality of first opening guide lines arranged side by side toward the sealing portion on the unsealing end side. Two second opening guide lines extending ;
A third opening guide line from the second opening guide line of each of the opposed non-fused parts to the seal part on the opening end point side,
The two second unsealing guide lines of each of the opposed non-fused portions intersect at one point on the unsealing end point side, and the intersecting points of the second unsealed guide lines of each of the opposed non-fused portions are relative to each other. The one third opening guide line reaches the seal part on the opening end side from the intersection of the second opening guide lines, and the third opening guide lines of each of the opposing films are opposed to each other,
A packaging bag , wherein only one of the third opening guide lines is provided as an opening guide line on the opening end point side of the two second opening guide lines of each of the opposing films .

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