JP6422876B2 - Packaging material for pouch containers and pouch containers - Google Patents

Description

  The present invention relates to a packaging material for a pouch container and a pouch container.

  Pouch containers are widely used as containers for beverages such as sports drinks and foods such as ice cream and jelly. Patent Document 1 discloses an example of a conventional pouch container. FIG. 13 shows a packaging material for manufacturing the pouch container disclosed in Patent Document 1. The packaging material X shown in the figure includes a pair of exterior films 91, a pair of gusset films 92, and a spout 93. The pair of exterior films 91 are disposed on the front side and the back side. The pair of gusset films 92 are positioned between the pair of exterior films 91 in a state where each of the gusset films 92 is folded.

The packaging material X includes a top-side center seal portion 94, a top-side side seal portion 95, a side seal portion 96, a bottom-side seal portion 97, and the like so that the contents such as the beverage and the food can be stored in a sealed state. An oblique seal portion 98 is formed. The top-side center seal portion 94 is formed by joining the top-side end portions of the pair of exterior films 91 with each other with the spout 93 sandwiched therebetween. The top side seal portion 95 is formed by joining the top end portions of the pair of exterior films 91 and the top end portions of the pair of gusset films 92 together.
The side seal portion 96 is formed by joining the side end portions of the pair of exterior films 91 and the side end portions of the pair of gusset films 92. The bottom seal portion 97 is formed by joining bottom end portions of a pair of exterior films 91. The oblique seal portion 98 is formed by joining the oblique sides of the pair of exterior films 91 and the oblique sides of the pair of gusset films 92. In the packaging material X, the inner end edge 96a of the side seal portion 96, the inner end edge 97a of the bottom side seal portion 97, and the inner end edge 98a of the oblique seal portion 98 are all substantially parallel to the outer end edge. , Straight over the entire length.

  In the method of manufacturing a pouch container using the packaging material X, a leak test process for inspecting whether or not there is a leak may be performed prior to filling the contents. In this leak test process, for example, the nozzle Nz shown in FIG. Next, as shown in FIG. 14, for example, air is instantaneously blown from the nozzle Nz in a short time (around 2 seconds). FIG. 14 shows a state in which the packaging material X starts to expand due to this blowing. When the air blowing is completed, the packaging material X is completely inflated as shown in FIG. In this state, the leakage of air from the packaging material X is detected, and the contents are filled using the packaging material X determined to have no leakage.

  However, in the leak test process, as shown in FIG. 15, a phenomenon that the oblique seal portion 98 is turned over may occur. In the figure, for the sake of easy understanding, the portion formed by the pair of exterior films 91 in the oblique seal portion 98 is shaded and colored, and the portion formed by the pair of gusset films 92 in the oblique seal portion 98 is white. It is said. Of the four oblique seal portions 98 shown in the figure, the oblique seal portion 98 located at the lower left in the figure is turned over so that the portion of the gusset film 92 forming this is exposed to the bottom side. Further, the bottom seal portion 97 is in an upright posture as the slant seal portion 98 is turned over.

  When the leak test process is completed, the internal space of the packaging material X is degassed, and the packaging material X is brought into a flat state again. And the process of filling the said content is performed. If the above-described creaking occurs in the leak test process, the crease is still present even after the flattening, and the possibility that the crease will recur in the process of filling the contents is extremely high. A pouch container having such a turn-up has a high risk of unintended stress being generated at the bottom in a transport process or the like, and causes leakage. In such a case, although the packaging material X determined to have no leakage in the leak test process is used, the contents leak from the pouch container X manufactured thereby. It was.

JP 2000-344252 A

  The present invention has been conceived under the circumstances described above, and effectively prevents the slanted seal portion from being turned over, and the packaging material for a pouch container capable of suppressing leakage of contents from the pouch container, and The object is to provide a pouch container.

  The packaging material for the pouch container provided by the first aspect of the present invention is located on the front side and the back side across the filling and pouring member disposed on the top side, and has a side end and a bottom side end. And a pair of exterior films having a hypotenuse end portion disposed between the side end portions and the side end portions thereof, and a pair of exterior films in a folded state, and positioned between the pair of exterior films. A pair of gusset films having a side end portion and a hypotenuse end portion; a side seal portion in which a side end portion of the pair of exterior films and a side end portion of the pair of gusset films are joined; and the pair of exterior films A bottom side sealing portion in which the bottom side end portions of the outer packaging film are joined together, and a packaging material for a pouch container comprising an oblique sealing portion in which the oblique side end portion of the exterior film and the oblique side end portion of the gusset film are joined. The diagonal Inner edge of Lumpur unit is characterized in that at least a portion of which is curved.

  In a preferred embodiment of the present invention, the oblique seal portion has a narrow width portion that is narrower than the width at both ends.

  In a preferred embodiment of the present invention, the inner end edge of the oblique seal portion has a curved portion connected to the inner end edge of the side seal portion.

  In a preferred embodiment of the present invention, the inner end edge of the oblique seal portion has a curved portion connected to the inner end edge of the bottom seal portion.

  In a preferred embodiment of the present invention, the inner end edge of the oblique seal portion is all curved.

  The pouch container provided by the second aspect of the present invention is characterized by comprising the packaging material provided by the first aspect of the present invention and the contents contained in the packaging material.

  According to the present invention, at least a part of the inner end edge of the oblique seal portion is configured by a curve. Thereby, at the inner end edge of the oblique seal portion, the stress state is not uniform in the longitudinal direction over the entire length, but gradually changes according to the curved shape. As a result, stress is prevented from being concentrated locally in a short time at locations where the inner end edge of the side seal portion and the inner end edge of the bottom side seal portion intersect at both ends of the inner end edge of the oblique seal portion. This stress can be dispersed. Therefore, it is difficult to turn up the oblique seal portion and the bottom seal portion 44 to stand up, and the contents leak in the pouch container manufactured using the packaging material is greatly suppressed as compared with the conventional pouch container. can do.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a front view which shows the packaging material based on 1st embodiment of this invention. It is sectional drawing which follows the II-II line | wire of FIG. It is sectional drawing which follows the III-III line of FIG. It is a perspective view which shows the leak test process in the manufacturing method of a pouch container using the packaging material of FIG. It is a perspective view which shows the leak test process in the manufacturing method of a pouch container using the packaging material of FIG. It is a perspective view which shows an example of the pouch container using the packaging material of FIG. It is sectional drawing which follows the VII-VII line of FIG. It is a principal part front view which shows the packaging material based on 2nd embodiment of this invention. It is a principal part front view which shows the packaging material based on 3rd embodiment of this invention. It is a principal part front view which shows the packaging material based on 4th embodiment of this invention. It is a principal part front view which shows the packaging material based on 5th embodiment of this invention. (A)-(d) is a principal part front view which shows the comparative example of a packaging material. It is a perspective view which shows an example of the manufacturing method of the pouch container using the conventional packaging material. It is a perspective view which shows an example of the manufacturing method of the pouch container using the conventional packaging material. It is a perspective view which shows an example of the manufacturing method of the pouch container using the conventional packaging material.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings. In addition, with the pouch container filled with contents self-supporting at the store, the purchaser side is the front side, the opposite side is the back side, the left and right direction is the side, the vertical upper side is the top side, the vertical direction lower side Is the bottom side. About each film, let the surface exposed outside in the state of a pouch container be the surface, and let the surface on the opposite side be a back surface. The vertical direction in the self-supporting state is the up-down direction and the left-right direction is the width direction.

  1 to 3 show a packaging material for a pouch container according to the first embodiment of the present invention. The packaging material A1 of the present embodiment includes a pair of exterior films 1, a pair of gusset films 2, and a spout 3, and includes a top center seal portion 41, four top side seal portions 42, and four side seal portions. 43, a bottom-side seal portion 44 and four oblique seal portions 45 are formed. 1 is a front view of the packaging material A1, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  The pair of exterior films 1 are arranged on the front side and the back side with the spout 3 on the top side. In the present embodiment, each exterior film 1 has a substantially hexagonal shape when viewed from the front, and has a top side end portion extending in the width direction on the top side and two side end portions extending in the vertical direction and spaced apart in the width direction. And a bottom end that extends in the width direction on the bottom side, and two oblique sides that connect the lower end of the side end and the upper end of the bottom end.

  The pair of gusset films 2 are disposed between the pair of exterior films 1 in a state where each pair of gusset films 2 is folded at a fold line 21. Each gusset film 2 has a top end, two side ends, and two oblique sides, and is substantially pentagonal in an unfolded state. The gusset film 2 has notches 22 formed at both ends of the top end.

  The pair of exterior films 1 and the pair of gusset films 2 are usually composed of resin films. The resin film is required to have basic performance as a package, such as impact resistance, wear resistance, and heat resistance. Moreover, since each said seal | sticker part is normally formed by heat seal, the heat seal property is also requested | required of a sheet | seat. As the sheet, a multilayer sheet having a base film layer and a sealant layer that imparts heat sealability is suitable. When high gas barrier properties and light shielding properties are required, the base film layer and the sealant layer It is preferable to provide a barrier layer therebetween. In addition, you may provide barrier property to the base film layer itself. In this case, a multilayer sheet having a barrier layer and a sealant layer is obtained using the barrier layer as a base film layer.

Here, constituent materials of the base film layer, the sealant layer, and the gas barrier layer are exemplified.
In addition, lamination | stacking of these each layer can be performed by the conventional lamination method, for example, the co-extrusion lamination, the dry lamination by an adhesive agent, the heat lamination which adhere | attaches with a heat | fever by pinching | interposing a heat adhesive layer.

  As the film constituting the base film layer, polyester (polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polycarbonate (PC), etc.), polyolefin (polyethylene (PE), polypropylene ( PP) etc.), polyamide (nylon-6, nylon-66 etc.), polyacrylonitrile (PAN), polyimide (PI), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polymethyl methacrylate (PMMA), poly A stretched or unstretched film of one layer or two or more layers composed of ether sulfone (PES) or the like can be exemplified.

  The films constituting the sealant layer include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), ethylene-propylene copolymer (EP), unstretched polypropylene (CPP), and biaxially stretched nylon (ON). , Ethylene-olefin copolymer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-vinyl acetate copolymer (EVA), etc. The stretched or unstretched film can be exemplified.

  The gas barrier layer may be a metal thin film such as aluminum, a resin film such as vinylidene chloride (PVDC) or ethylene-vinyl alcohol copolymer (EVOH), or any synthetic resin film (for example, a base film layer). ), And a film obtained by vapor-depositing (or sputtering) an inorganic oxide such as aluminum, aluminum oxide, or silica.

  The exterior film 1 or the gusset film 2 may be provided with a printing layer (not shown) for displaying the product name of the contents, the product description such as raw materials and precautions for use, and other various designs. For example, the printing layer can be formed on the inner surface of the base film layer by a known method such as gravure printing.

  The top side center seal portion 41 is obtained by joining the center portions of the top side edges of the pair of exterior films 1 by heat sealing. The top side center seal portion 41 is located between the pair of gusset films 2. Moreover, in this embodiment, the top side center seal | sticker part 41 has pinched the spout 3 in the center. The top edge of the pair of exterior films 1 and the spout 3 are joined in a sealed state by heat sealing or the like.

  The top side seal part 42 is formed by joining the side part of the top side edge of the exterior film 1 and one side part of the top side edge of the gusset film 2 by heat sealing. In the present embodiment, the four top side seal portions 42 are formed by the pair of exterior films 1 and the pair of gusset films 2.

  The side seal portion 43 is formed by joining the side end portion of the exterior film 1 and the side end portion of the gusset film 2 by heat sealing, and extends in the vertical direction. In the present embodiment, four side seal portions 43 are formed by the pair of exterior films 1 and the pair of gusset films 2.

  The bottom-side seal portion 44 is formed by joining the bottom-side edges of the pair of exterior films 1 by heat sealing, and extends in the width direction. The bottom seal portion 44 is located between the pair of gusset films 2.

  The oblique seal portion 45 is formed by joining the oblique side end of the exterior film 1 and the oblique side end of the gusset film 2 by heat sealing. The oblique seal portion 45 is inclined with respect to both the vertical direction and the width direction. In the present embodiment, the four oblique seal portions 45 are formed by the pair of exterior films 1 and the pair of gusset films 2. The two oblique seal portions 45 located on one side in the width direction are connected to one end in the width direction of the bottom side seal portion 44.

  The side seal portion 43, the bottom seal portion 44, and the oblique seal portion 45 have an inner end edge 43a, an inner end edge 44a, and an inner end edge 45a. In the present embodiment, the inner end edge 43a is a straight line along the vertical direction over the entire length thereof. The inner end edge 44a is a straight line whose entire length is along the width direction. The inner end edge 45a is a curve whose entire length swells outward. That is, the inner end edge 45a is a curve in which all of the portion connected to the inner end edge 43a of the side seal portion 43, the portion connected to the inner end edge 44a of the bottom side seal portion 44, and the portion sandwiched between them are curved. I can say that. In FIG. 1, a portion with deep hatching along the inner end edge 45a indicates a curved portion of the inner end edge 45a. In the present embodiment, dark hatching is provided over the entire length of the inner end edge 45a.

  Further, the oblique seal portion 45 is configured such that the width W3 near the center is narrower than the width W1 at the end portion on the side seal portion 43 side and the width W2 at the end portion on the bottom seal portion 44 side. This is because at least a part of the inner end edge 45a, in the present embodiment, all of the inner end edge 45a is constituted by a curved line bulging outward.

  In the present embodiment, two shoulder joints 46 are formed in the packaging material A1. Reference numeral 46 denotes a structure in which the back surfaces of the intersections between the top end and the side end of the pair of exterior films 1 are joined by heat sealing through the notch 22 of the gusset film 2.

  The spout 3 constitutes a path for filling and dispensing the contents, and is a hollow member made of resin, for example. The spout 3 has a cylindrical part for filling and dispensing and a boat-shaped weld part joined to the sheet bag body. The spout 3 is fixed to the pair of exterior films 1 by the boat-shaped welded portion being sandwiched between the pair of exterior films 1 and hermetically bonded by the top center seal portion 41. The spout 3 corresponds to the filling and pouring member referred to in the present invention.

4 and 5 show a leak test process in the method for manufacturing a pouch container using the packaging material A1. In the manufacturing method of the packaging material A1 performed prior to this, it is manufactured by a generally known method. Specifically, in general, a plurality of sheet materials are appropriately folded and overlapped and then heat-sealed in place. . Then, the sheet bag body is obtained by cutting the sheet material. Thereafter, the boat-shaped welded portion of the spout 3 is sandwiched between the outer packaging films 1 on the top side of the sheet bag body, and the packaging material A1 is sequentially manufactured by hermetically bonding by heat sealing.
The leak test process is a process for confirming whether or not an unintentional leak occurs mainly in the heat-sealed part.

First, as shown in FIG. 4, for example, a nozzle Nz is caused to enter the spout 3 of the packaging material A1.
The nozzle Nz blows air for performing a leak test process. When blowing from the nozzle Nz is started, the pressure in the space defined by the pair of exterior films 1 and the pair of gusset films 2 rises, the packaging material A1 swells, and as shown in FIG. Fully inflated. This air blowing is instantaneously performed in a short time (around 2 seconds). In this state, the four oblique seal portions 45 are not turned up, and the bottom seal portion 44 is appropriately folded so as to be along one of the exterior films 1. When the bulge of the packaging material A1 is completed, the expanded state is maintained, and the presence or absence of air leakage from the packaging material A1 is inspected by a sensor or the like (not shown). This inspection time is about 2 to 3 seconds. The packaging material A1 in which air leakage is detected is determined to be unsuitable for filling the contents, and is not used in the subsequent steps. When the leak test process is completed, the internal space of the packaging material A1 is degassed in a short time (around 1 second), and the packaging material A1 is brought into a flat state again.

  The packaging material A1 in a flat state is subjected to a content filling step by a generally known method. Thereby, as shown in FIGS. 6 and 7, the pouch container B1 in which the packaging material A1 is filled with the contents Lq is obtained. In addition, after filling the content Lq, a cap 31 that is screwed into the spout 3 is appropriately attached.

  Next, the operation of the packaging material A1 will be described.

  Although the cause of turning up easily in the leak test process of the packaging material X according to the prior art is not clear, the following hypothesis can be considered. In the leak test process of the packaging material X according to the prior art shown in FIGS. 13 to 15, as the internal pressure of the packaging material X increases, the inner edge 96 a of the side seal portion 96 and the inner edge of the bottom seal portion 97 The stress corresponding to each shape arises in 97a and the inner edge 98a of the diagonal seal | sticker part 98. FIG. The inner end edges 96a, 97a, and 98a are all straight lines, and a stress is generated in each of the inner end edges 96a, 97a, and 98a while maintaining the straight lines. In other words, the stress direction and magnitude tend to be relatively uniform in the longitudinal direction in the portion extending over almost the entire length excluding both ends of the inner end edges 96a, 97a, 98a. On the other hand, as a reaction of the fact that the stress is uniform over almost the entire length, the stress is localized at a place where the inner end edge 96a and the inner end edge 98a are connected and at a place where the inner end edge 97a and the inner end edge 98a are connected. Easy to concentrate on. And since the blowing of air is performed for a short time, it concentrates instantaneously and the part expands vigorously. The inventors show that this is a behavior in which the portion where the side seal portion 96 and the oblique seal portion 98 are connected and the portion where the bottom seal portion 97 and the oblique seal portion 98 are connected are locally bent. Thus, it was estimated that the slanted seal portion 98 shown in FIGS. 14 and 15 was turned up and the bottom seal portion 97 was raised due to this.

  Based on the knowledge mentioned above, in this embodiment, as shown in FIG. 1, the inner end edge 45a of the diagonal seal | sticker part 45 is comprised by the curve. For this reason, in the inner end edge 45a, the stress state is not uniform in the longitudinal direction, and gradually changes according to the curve shape. As a result, stress is concentrated locally at both ends of the inner edge 45a where the side seal portion 43 and the oblique seal portion 45 are connected, and where the bottom seal portion 44 and the oblique seal portion 45 are connected. Can be avoided and stress can be distributed. Therefore, it is possible to prevent the oblique seal portion 45 from turning up and the bottom seal portion 44 from standing, and to prevent the contents from leaking in the pouch container manufactured using the packaging material A1. it can.

  By providing the width W1 and the width W3 narrower than the width W2 at both ends of the oblique seal portion 45, the inner end edge 45a of the oblique seal portion 45 has a shape bulging outward. According to the inventors' research, it has been found that providing such a bulging shape on the outside is advantageous for preventing turning-up.

  Even in the method of manufacturing the pouch container by filling the contents without performing the leak test process, in the process of filling the contents, the turning of the oblique seal portion 45 and the bottom side seal portion 44 are performed. There are concerns about standing up. Even in such a manufacturing method, at least a part of the inner end edge 45a of the oblique seal portion 45 of the packaging material A1 is curved, thereby suppressing the turning of the oblique seal portion 45 and the standing seal portion 44 from standing. Can be expected.

  8 to 11 show another embodiment of the present invention. In these drawings, the same or similar elements as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment. Further, in these drawings, the point that the curved portion of the inner edge 45a is darkly hatched is the same as in FIG.

  FIG. 8 shows a packaging material for a pouch container according to the second embodiment of the present invention. In the packaging material A2 of this embodiment, in addition to the entire inner end edge 45a of the oblique seal portion 45 being curved, the inner end edge 45a side portion and the bottom seal portion 44 of the inner end edge 43a of the side seal portion 43 are included. The inner end edge 45a side portion of the inner end edge 44a is curved. As shown in the figure, the inner end edge 43a and the inner end edge 45a are continuously connected to each other. In other words, a portion where the inner end edge 43a and the inner end edge 45a are connected is a curved line. In addition, the inner end edge 44a and the inner end edge 45a are continuously connected to each other. In other words, a place where the inner end edge 44a and the inner end edge 45a are connected is a curve. In addition, it can be said that the packaging material A2 of this embodiment is also a structure in which the diagonal seal part 45 has the width W1 and the width W3 narrower than the width W2 in both ends. According to such an embodiment, it is possible to suppress the concentration of stress at both ends of the inner end edge 45a, and to end the inner end edge 43a on the inner end edge 45a side, and the inner end edge 45a of the inner end edge 44a. The effect of further suppressing the stress concentration can be expected at the end portion on the side. Therefore, it is suitable for preventing the oblique seal portion 45 from being turned over and the bottom seal portion 44 from standing up.

  FIG. 9 shows a packaging material for a pouch container according to the third embodiment of the present invention. In the packaging material A3 of the present embodiment, among the inner end edge 45a of the oblique seal portion 45, only the vicinity of the end portion on the inner end edge 43a side of the side seal portion 43 is a curve, and the other portions are straight lines. Yes. Moreover, the inner end edge 45a side part of the inner end edge 43a is made into the curve, and the inner end edge 43a and the inner end edge 45a are connected continuously. In other words, a portion where the inner end edge 43a and the inner end edge 45a are connected is a curve. Even if only a part of the inner end edge 45a is a curved line as in the present embodiment, the stress concentration at the end part is suppressed as compared with a configuration in which the entire inner end edge 45a is a straight line. An effect is obtained. In particular, an effect of suppressing stress from being excessively concentrated at the end of the inner end edge 45a on the inner end edge 43a side can be expected. Thereby, it is possible to prevent the bend behavior from occurring at a portion where the side seal portion 43 and the oblique seal portion 45 are connected, and the turning of the oblique seal portion 45 can be suppressed.

FIG. 10 shows a packaging material for a pouch container according to the fourth embodiment of the present invention. In the packaging material A4 of this embodiment, among the inner end edge 45a of the oblique seal portion 45, only the vicinity of the end portion on the inner end edge 44a side of the bottom seal portion 44 is a curve, and the other portions are straight lines. ing. Further, the entire inner edge 44a is curved, and the inner edge 44a and the inner edge 45a are continuously connected.
In other words, a portion where the inner end edge 44a and the inner end edge 45a are connected is a curve. As described with reference to the wrapping material A3, an effect of suppressing stress concentration at the end portion is obtained when a part of the inner end edge 45a is a curve. In particular, in the present embodiment, an effect of preventing stress concentration at the end of the inner end edge 45a on the inner end edge 44a side can be expected.

  FIG. 11 shows a packaging material for a pouch container according to the fifth embodiment of the present invention. The wrapping material A5 of the present embodiment has a curved portion in which the vicinity of the center of the inner edge 45a bulges partially outward. Such a configuration can be said to be a configuration in which the width W3 at the center is significantly narrower than the width W1 and the width W2 at both ends of the oblique seal portion 45. Even in such an embodiment, since a part of the inner edge 45a is a curve, it is possible to reduce the stress concentration at both ends and to expect the effect of suppressing the turning of the oblique seal portion 45 and the standing of the oblique seal portion 45. .

  Next, for the packaging materials A1 to A5 according to the present invention described above, the packaging material X according to the prior art shown in FIG. 13, and the packaging materials C1 to C5 as comparative examples shown in FIG. The results of the test are shown in Table 1.

  The packaging materials A1 to A5 are configured as described above. In the packaging material X, the inner end edge 45a of the oblique seal portion 45 is configured by only one straight line as shown in FIG. FIG. 12 shows packaging materials C1 to C4 as comparative examples. As will be described below, these packaging materials C1 to C2 are mainly formed by changing the shape of the inner end edge 45a of the oblique seal portion 45 only with a straight line.

  The packaging material C1 shown in FIG. 12A has a configuration in which the angle at which the inner end edge 43a of the side seal portion 43 and the inner end edge 45a of the oblique seal portion 45 are connected is larger than that of the packaging material X. Specifically, the intersection of the inner end edge 43a and the inner end edge 45a is shifted upward, and a bending point is set at the inner end edge 45a. The packaging material C2 shown in FIG. 12B has a configuration in which the angle at which the inner end edge 44a of the bottom seal portion 44 and the inner end edge 45a of the oblique seal portion 45 are connected is larger than that of the packaging material X. Specifically, the angle is set to be large by increasing the width of the bottom seal portion 44.

  The wrapping material C3 shown in FIG. 12C has a bending point set near the center of the inner edge 45a, and the width of this portion is narrower than the width at both ends. The packaging material C4 shown in FIG. 12D has a configuration in which the width of the oblique seal portion 45 is narrower than that of the packaging material X over the entire length.

  The results are shown in Table 1, and in the turning test, 50 pieces of packaging materials A1 to A5, packaging material X, and packaging materials C1 to C4 are prepared, and a leak test process is performed on them. It was visually confirmed whether 45 turn-over occurred.

  As shown in Table 1, the turnover rate of the packaging material X according to the prior art is 51%, whereas the turnover rate of the packaging materials A1 to A5 according to the present invention is 21% to 38%, both. It was lower than the packaging material X. Thereby, it turns out that the effect of curling suppression is acquired by making at least one part of the inner edge 45a of the diagonal seal | sticker part 45 into a curve. In particular, the packaging materials A1, A2 and A3 have a turnover rate of 21%, 23% and 25%, which is half that of the packaging material X, and a good curling suppression effect is obtained. This is considered to be an effect of configuring the entire inner end edge 45a with a curve. The wrapping materials A3 and A4 have a configuration in which only the bottom seal portion 44 side of the inner end edge 45a is curved, but the turnover occurrence rate is 38%, and the turnover suppressing effect is obtained. Further, from the comparison between the packaging material A3 and the packaging material A4, the bottom side seal portion 44 is configured such that the portion where the inner end edge 43a of the side seal portion 43 is connected to the inner end edge 45a of the oblique seal portion 45 is curved. It can be said that the turning-up suppressing effect is higher than the configuration in which the portion where the inner end edge 44a of the slant seal portion 45 is connected to the inner end edge 45a is curved. The packaging material A5 has a configuration in which only the vicinity of the center of the inner end edge 45a is curved and the vicinity of both ends is a straight line. Even in such a packaging material A5, the turnover occurrence rate is 31%, and the turnover suppressing effect is obtained. Thereby, even if it is the structure in which the curved part in the inner edge 45a is not provided in the edge part, it distributes that stress concentrates on both ends (intersection with inner edge 43a, 44a) of the inner edge 45a. It turns out that an effect is acquired.

On the other hand, referring to the results of Comparative Examples C1 to C4, the turnover rate is 51% to 73%, which is equal to or worse than the turnover rate of the packaging material X according to the prior art. Therefore, even if the shape and position of the inner end edge 45a are changed, if the inner end edge 45a has only a straight line, the turning of the oblique seal portion 45 is not improved, and conversely the turning is promoted. It can be said that there is no doubt.
From the above, according to the packaging material according to the present invention in which at least a part of the inner end edge 45a, which is represented by the packaging materials A1 to A5, is configured by a curve, the effect of suppressing the turning of the oblique seal portion 45 appropriately You can see that it is played.

  The packaging material for a pouch container according to the present invention is not limited to the above-described embodiment. The specific configuration of the packaging material for the pouch container according to the present invention can be changed in various ways.

A1 to A5 Packaging material B1 Pouch container 1 Exterior film 2 Gusset film 21 Fold 22 Cutout 3 Spout 31 Cap 41 Top side center seal part 42 Top side seal part 43 Side seal part 43a Inner edge 44 Bottom side seal part 44a Inside Edge 45 Slant seal 45a Inner edge 46 Shoulder joint

Claims (4)

A filling and pouring member arranged on the top side;
A pair of exterior films that are located on the front side and the back side, and that have side end portions, bottom end portions, and oblique side ends disposed between these side end portions and bottom end portions,
A pair of gusset films that are located between the pair of exterior films in a folded state, and that have side end portions and oblique side end portions,
A side seal part in which a side end part of the pair of exterior films and a side end part of the pair of gusset films are joined, a bottom side seal part in which bottom end parts of the pair of exterior films are joined, And a packaging material for a pouch container comprising an oblique seal part in which the oblique side end of the exterior film and the oblique side end of the gusset film are joined,
The inner edge of the oblique seal portion is a curve whose entire length swells outwardly ,
The packaging material for a pouch container, wherein the oblique seal part has a narrow part narrower than a width at both ends. The packaging material for a pouch container according to claim 1, wherein the narrow width portion is located near a center of the oblique seal portion. The packaging material for a pouch container according to claim 1 or 2 , wherein a portion where the inner end edge of the oblique seal portion and the inner end edge of the bottom seal portion are connected is a curve. A packaging material according to any one of claims 1 to 3 ,
A pouch container comprising the contents contained in the packaging material.

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