JP2015040057A - Packaging material for pouch container and manufacturing method for pouch container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material for a pouch container and a manufacturing method for a pouch container capable of suppressing leakage of content from the pouch container.SOLUTION: A packaging material A1 for a pouch container includes: a pair of exterior films 1 located on a front surface side and a back surface side by sandwiching a spout 3 arranged at a top side; a pair of gusset films 2 located between the pair of exterior films 1 in a state where each of them is folded; and side seal parts 43 in which side end parts of the pair of exterior films 1 and side end parts of the pair of gusset films 2 are bonded. At the side end parts of the packaging material A1 of the pouch container, weak bond parts 47 are provided having weaker bond strength than the side seal parts 43 and fixing the gusset films 2 in a folded state.

Description

  The present invention relates to a packaging material for a pouch container and a method for manufacturing the 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. 19 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, An oblique seal portion 97 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 bottom oblique side ends of the pair of exterior films 91 and the bottom oblique side ends of the pair of gusset films 92.

  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. 20, for example, air is blown from the nozzle Nz. FIG. 20 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. 21, a phenomenon may occur in which the oblique seal portion 98 is turned over. 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 was used, there was a problem that the contents leaked from the pouch container manufactured thereby. .

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 It is an object of the present invention to provide a method for manufacturing a pouch container.

  A packaging material for a pouch container provided by the first aspect of the present invention includes a pair of exterior films positioned on the front side and the back side across a filling and pouring member arranged on the top side, and each folded. A pair of gusset films located between the pair of exterior films, a side seal portion in which side end portions of the pair of exterior films and side end portions of the pair of gusset films are joined, A packaging material for a pouch container comprising: a bonding strength weaker than that of the side seal portion and fixed to the side end portion of the packaging material for the pouch container in a folded state. It is characterized by having a weak joint.

  In preferable embodiment of this invention, the said weak junction part is provided so that it may overlap with the full length of the said side seal part.

  In a preferred embodiment of the present invention, the weakly joined portion is formed by joining the side end portions of the pair of exterior films.

  The method for manufacturing a pouch container provided by the second aspect of the present invention includes a pair of exterior films positioned on the front side and the back side, and the pair of exterior gusset films in a folded state. A step of forming a side seal portion by joining a side end portion of the pair of exterior films and a side end portion of the pair of gusset films; A step of forming a weakly bonded portion that fixes the gusset film in a folded state with a weak bonding strength.

  In a preferred embodiment of the present invention, the step of forming the side seal portion and the step of forming the weakly bonded portion are performed simultaneously.

  In preferable embodiment of this invention, in the process of forming the said weak junction part, the said side edge part of a pair of said exterior film is joined.

  In a preferred embodiment of the present invention, after the step of forming the side seal portion and the step of forming the weakly bonded portion, the pressure in the space defined by the pair of exterior films and the pair of gusset films is increased. Thus, a leak test process for inspecting whether or not there is a leak is provided, and the weak joint is peeled off in the leak test process.

  According to the present invention, for example, in the leak test process, by providing the weak joint portion, the entire packaging material is prevented from being swollen at a stretch. Thereby, it can suppress that a part of said wrapping material A1 turns up unjustly. Therefore, the leakage of the contents in the pouch container manufactured using the packaging material can be prevented.

  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 schematic perspective view which shows the process of arrange | positioning film material in a predetermined position in the manufacturing method of the pouch container based on 1st embodiment of this invention. In the manufacturing method of the pouch container based on 1st embodiment of this invention, it is sectional drawing which shows the film material piled up. In the manufacturing method of the pouch container based on 1st embodiment of this invention, it is sectional drawing which shows the front | former stage of the process of forming a side seal part and a weak junction part. It is sectional drawing which shows the process of forming a side seal part and a weak junction part in the manufacturing method of the pouch container based on 1st embodiment of this invention. It is a perspective view which shows the leak test process in the manufacturing method of the pouch container based on 1st embodiment of this invention. It is a perspective view which shows the leak test process in the manufacturing method of the pouch container based on 1st embodiment of this invention. It is sectional drawing which follows the XX line of FIG. It is a perspective view which shows the leak test process in the manufacturing method of the pouch container based on 1st embodiment of this invention. It is sectional drawing which follows the XII-XII line | wire of FIG. It is a perspective view which shows an example of the pouch container manufactured by the manufacturing method of the pouch container based on 1st embodiment of this invention. It is sectional drawing which follows the XIV-XIV line | wire of FIG. It is a principal part expanded sectional view which shows the modification of the packaging material of FIG. It is a principal part expanded sectional view which shows the other modification of the packaging material of FIG. It is a front view which shows the packaging material based on 2nd embodiment of this invention. It is a schematic perspective view which shows an example of the manufacturing method of the packaging material shown in FIG. 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 seal portion 44, four oblique seal portions 45, and two weak joint portions 47 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 extending in the width direction on the bottom side, and two bottom hypotenuses each connecting 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 bottom hypotenuse ends, 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. In addition, when providing heat sealability on both sides of the sheet, a single-layer film that forms a sealant layer described later may be used, or in the case of a multilayer sheet, whether two layers of the same or different sealant layers are used. (At this time, one layer of the sealant layer is formally used as the base film layer), or a sheet having a sealant layer on both sides of the base film layer may be used.

  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 can 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, and various other 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 obtained by joining the bottom oblique side end of the exterior film 1 and the bottom 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.

  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 weakly bonded portion 47 fixes the gusset film 2 in a folded state at a side end portion of the packaging material A1 with a bonding strength weaker than that of the side seal portion 43. In the present embodiment, the side end portions of the pair of exterior films 1 are fixed with a bonding strength weaker than that of the side seal portions 43, and the gusset film 2 is sandwiched between the pair of exterior films 1. It is fixed in the folded state. Moreover, the weak junction part 47 is formed so that it may overlap with the full length of the side seal part 43 in an up-down direction. That is, the upper end of the weak joint portion 47 coincides with the lower end of the shoulder joint portion 46. Since the notch 22 is provided in the gusset film 2, the upper end of the side seal portion 43 also coincides with the lower end of the shoulder joint portion 46. The lower end of the weak joint portion 47 coincides with the upper end of the oblique seal portion 45, and the lower end of the side seal portion 43 also coincides with the upper end of the oblique seal portion 45. In the present embodiment, two weak joints 47 are formed at both ends in the width direction.

  Moreover, in this embodiment, as it appears well in FIG. 2, the weakly bonded portion 47 extends outward in the width direction from the side end portions of the gusset film 2 among the side end portions of the pair of exterior films 1. The protruding portions are formed by joining together by heat sealing. The length that the side edge of the exterior film 1 protrudes from the side edge of the gusset film 2 is, for example, about 2 to 3 mm. Further, the bonding strength of the side seal portion 43 is 30 N to 100 N / 15 mm, whereas the bonding strength of the weak bonding portion 47 is usually 10 N / 15 mm or less, preferably 3 N to 6 N / 15 mm. In addition, the said joint strength says the value measured by the method according to 180 degree | times peeling of JISZ0237. Specifically, the bonding strength is determined by a laminated body in which the exterior film 1 and the gusset film 2 are joined (measurement target as the side seal portion 43) or a laminated body in which the exterior films are joined (as the weakly joined portion 47). Is measured at 100 mm × 15 mm, and the maximum strength when peeled 180 degrees at a temperature of 23 ± 2 ° C., a humidity of 50 ± 5% RH, and a speed of 200 mm / min.

  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 is fixed to the pair of exterior films 1 by sandwiching and sealingly sealing the middle part of the spout 3 with the top center seal portion 41. The spout 3 corresponds to the filling and pouring member referred to in the present invention.

  Next, an example of a method for manufacturing a pouch container using the packaging material A1 will be described below with reference to FIGS.

  FIG. 4 shows a process of arranging a plurality of film materials at predetermined positions. In this step, a pair of exterior film materials 10 and a pair of gusset film materials 20 are used. A pair of exterior film material 10 and a pair of gusset film material 20 become a pair of exterior film 1 and a pair of gusset films 2, respectively, and consist of a multilayer sheet material mentioned above. As a pair of exterior film material 10 and a pair of gusset film material 20, the elongate multilayer sheet material wound up by roll shape is used suitably.

  A pair of exterior film material 10 which has progressed from the upper side and the lower side in the figure is conveyed in the arrow direction in the figure in a parallel posture so that the back surfaces of each other face each other. Moreover, it conveys between a pair of exterior films 1 in the state folded while forming the crease | fold 21 in the pair of gusset film material 20 which has advanced in the attitude | position which a width direction corresponds to the up-down direction in the figure. Thereby, a cross section in a plane perpendicular to the transport direction is in the state shown in FIG. At this time, the pair of exterior film materials 10 and the pair of gusset film materials 20 are arranged such that the side ends of the pair of exterior film materials 10 protrude from the side ends of the pair of gusset film materials 20 by, for example, about 2 to 3 mm. And align.

  Next, as shown in FIG. 6, a seal mold M is prepared. The seal mold M includes a sandwich heating part m1 having a size corresponding to the width of the side seal part 43, a sandwich heating part m2 having a size corresponding to the width of the weak joint 47, located outside the sandwich heating part m1, have. The nipping and heating part m2 is configured as a part slightly recessed from the nipping and heating part m1, for example, in the vertical direction in the figure in order to realize a holding force and heating weaker than those of the nipping and heating part m1. 6 and 7 exaggerate the thickness of the exterior film material 10 and the gusset film material 20 for convenience of explanation. For this reason, the depth at which the sandwiched heating portion m2 is recessed is exaggerated. In actuality, the depth of the depression of the sandwiched heating portion m2 is determined by considering the actual thickness of the exterior film material 10 and the gusset film material 20 so that the bonding strength of the weak bonding portion 47 is the bonding strength of the side seal portion 43. It is set to have a desired strength relationship with respect to the strength.

  Next, as shown in FIG. 7, the seal mold M sandwiches the side end portions of the pair of exterior film materials 10 and the side end portions of the pair of gusset film materials 20 at a predetermined pressure and at a predetermined temperature. Heat. At this time, the part sandwiched by the sandwiching heating part m <b> 1 serves as the two side seal parts 43. Further, portions of the pair of exterior film materials 10 that protrude from the pair of gusset film materials 20 are sandwiched by the sandwiching heating portion m2 of the seal mold M. The clamping force at this time is weaker than the clamping force by the clamping heating part m1. Further, since the sandwiching force is weak, the heating temperature by the sandwiching heating portion m2 can be lower than the heating temperature by the sandwiching heating portion m1. Thereby, the two weak junction parts 47 are formed. The configuration of the nipping and heating portion m2 is not particularly limited. For example, a configuration that is flush with the nipping and heating portion m1 but has a lower heating temperature than the nipping and heating portion m1 may be adopted as appropriate.

  Furthermore, the specific method for forming the weakly bonded portion 47 by heat sealing is not limited to the method described above. For example, the side seal portion 43 and the weakly bonded portion 47 may be separately formed by two heat seal molds. In this case, one heat seal mold is formed with a portion corresponding to the above-described sandwich heating portion m1, and the other heat seal mold is formed with a portion corresponding to the above-described sandwich heating portion m2.

  Next, the bottom seal portion 44 and the diagonal seal portion 45 are formed by another heat seal mold (not shown). By repeatedly performing this heat sealing, the pair of exterior film material 10 and the pair of gusset film material 20 are conveyed by a plurality of sets of side seal portion 43, bottom seal portion 44, oblique seal portion 45 and weakly bonded portion 47. It is formed in the direction. By cutting the pair of exterior film materials 10 and the pair of gusset film materials 20 in such a form so as to be divided in the longitudinal direction, a pair of exterior films 1 and a pair of gusset films 2 integrated with each other are obtained. can get.

  And the top side center seal | sticker part 41 and the two top side seal parts 42 are formed in the state which has arrange | positioned the spout 3 between the center parts of the top side edge part of a pair of exterior film 1. FIG. Prior to this step, the gusset film material 20 is preferably formed with a notch 22 before the step of forming the side seal portion 43. For this reason, the shoulder joint portion 46 is formed together with the formation of the top side seal portion 42. Thereby, the packaging material A1 shown in FIG. 8 is obtained.

  Next, a leak test process is performed. As shown in FIG. 8, 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, and for example, air having a pressure of about 0.1 MPa can be blown.

  9 and 10 show a state in which air has started to be blown from the nozzle Nz. When blowing starts, the pressure in the space defined by the pair of exterior films 1 and the pair of gusset films 2 rises, and the packaging material A1 begins to swell. Two weak joint portions 47 are formed in the packaging material A1, and these weak joint portions 47 function to fix the side end portions of the pair of exterior films 1 against the internal pressure. Therefore, the packaging material A1 tends to swell so that a typical cross-sectional shape has a substantially cylindrical shape as shown in FIG.

  In particular, in the present embodiment, the weak joint portion 47 is formed so as to overlap with the entire length of the side seal portion 43. For this reason, as for packaging material A1, the considerable part in an up-down direction becomes the substantially cylindrical shape mentioned above. On the other hand, at the stage where this cylindrical shape is formed, the four oblique seal portions 45 do not exhibit a large opening behavior, and maintain a relatively closed state between the weak joint portion 47 and the bottom seal portion 44. Yes.

  Furthermore, if blowing from the nozzle Nz is continued, the bonding strength of the weak bonding portion 47 cannot resist the internal pressure. Thereby, the two weak junction parts 47 peel and the packaging material A1 becomes a shape shown in FIG. 11 and FIG. In this state, the side edge of the front exterior film 1 and the side edge of the rear exterior film 1 are separated from each other, and the entire packaging material A1 swells greatly. Further, as the two weak joint portions 47 are peeled off, the four oblique seal portions 45 are separated from each other. According to the tests of the inventors, when the weakly bonded portion 47 peels after the packaging material A1 has the above-described substantially cylindrical shape, the oblique seal portion 45 is turned so that the gusset film 2 is exposed to the bottom side. There was almost no. Further, if the diagonal seal portion 45 is not turned over, the bottom seal portion 44 would fall smoothly into either the front side or the back side, and it would be difficult for the bottom side seal portion 44 to stand up improperly. Further, depending on the bonding strength of the weakly bonded portion 47 and the material of the exterior film 1, as shown in FIG. 14, the side end portion of the exterior film 1 is curved inward as the weakly bonded portion 47 is peeled off. An example was confirmed.

  When the bulging of the packaging material A1 is completed, the presence or absence of air leakage from the packaging material A1 is inspected by a sensor or the like (not shown). 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 evacuated, 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. 13 and 14, a 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 effect | action of the manufacturing method of packaging material A1 and pouch container B1 using this is demonstrated.

  According to the present embodiment, the weak bonding portion 47 is provided in the leak test process, thereby preventing the entire packaging material A1 from being swollen at once. Thereby, it can suppress that the diagonal seal | sticker part 45 grade | etc., Turns up illegally. Therefore, the leakage of the content Lq in the pouch container B1 manufactured using the packaging material A1 can be prevented. More specifically, according to the tests by the inventors, for example, in the example according to the prior art shown in FIGS. 19 to 21, the state in which the vicinity of the bottom of the packaging material X swells in advance is confirmed in FIG. 20. It was. At this time, the two oblique seal portions 98 located on the same side in the width direction are largely opened, and the gusset film 92 is exposed. Then, when the packaging material X is fully expanded after this mode, as shown in FIG. 21, one of the oblique seal portions 98 is turned over, and accordingly, the bottom seal portion 97 is likely to stand up. There was found. On the other hand, according to the wrapping material A1, by providing the weak joint portion 47, as shown in FIG. 11, turning up of the oblique seal portion 45 and rising of the bottom seal portion 44 can be suppressed.

  Even in the method of manufacturing the pouch container B1 by filling the contents Lq without performing the leak test process, the slanted seal portion 45 is turned over or the bottom side seal in the process of filling the contents Lq. There is concern about the standing of the portion 44. Also in such a manufacturing method, the effect which suppresses the turning-up of the diagonal seal part 45 and the standing-up of the bottom side seal part 44 can be anticipated by providing the weak bonding part 47 in the packaging material A1.

  Further, in the present embodiment, the weak joint portion 47 is formed long in the vertical direction so as to overlap the entire length of the side seal portion 43. Such a weak joint portion 47 is suitable for maintaining most of the packaging material A1 in a substantially cylindrical shape in a state where the packaging material A1 shown in FIGS. Further, the formation of the two weak joints 47 on both sides in the width direction of the packaging material A1 is suitable for maintaining the packaging material A1 in the above-described substantially cylindrical shape, and the contents Lq of the pouch container B1 Leakage can be suitably prevented.

  The lateral ends of the pair of exterior films 1 are protruded outward in the width direction from the lateral ends of the gusset film 2, and this portion is made into a weakly bonded portion 47 by heat sealing, whereby the exterior film 1 and the gusset film 2. The weak joint 47 can be formed without using a dedicated member other than the above. Further, for example, by adjusting the length by which the side end portions of the pair of exterior films 1 protrude outward in the width direction from the side end portions of the gusset film 2, the bonding strength of the weakly bonded portion 47 is set to a desired strength. There is an advantage that it can be set.

  As shown in FIG. 14, it can be expected that the side end portion of the exterior film 1 is curved inward in the pouch container B1 due to the peeling of the weakly bonded portion 47. By such a form, the end surface of the exterior film 1 becomes the attitude | position which faces the diagonally inner side, without facing the width direction outward straight. Thereby, when the purchaser holds the pouch container B1 by hand, it is possible to avoid the end surface of the exterior film 1 from touching the hand directly, and the end surface of the exterior film 1 is less likely to be damaged. This also contributes to giving a soft feel when the pouch container B1 is held in the hand.

  15 to 17 show modifications or other embodiments 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.

  FIG. 15 shows a modification of the packaging material A1. In this modification, the weakly bonded portions 47 are formed by bonding the side end portions of the pair of exterior films 1 with a weak adhesive (including a pressure sensitive adhesive) such as a so-called part coat. ing. Thus, the joining means for configuring the weak joint portion 47 is not particularly limited as long as the joining strength relationship with the side seal portion 43 can be a desired strength relationship. As a method for forming the weakly bonded portion 47, for example, a part of the overlapping side seal portions 43 is collectively deformed from one to the other in the thickness direction, so that one of the side seal portions 43 is deformed. A method (for example, referred to as embossing) in which a part is fitted into the other side seal portion 43 is used. This embossing process may be performed simultaneously with the heat sealing process for forming the side seal portion 43, for example.

  FIG. 16 shows another modification of the packaging material A1. In the present modification, the weakly bonded portions 47 are formed by bonding the surfaces of the side end portions of the gusset film 2 with a weakly adhesive agent (including an adhesive) such as a so-called part coat. Yes. Although the weakly bonded portion 47 does not directly bond the side end portions of the pair of exterior films 1, the side seal portions 43 are formed so that the side end portions of the gusset film 2 are bonded to each other. By doing so, fixation of the side edge part of a pair of exterior film 1 is implement | achieved. Further, the weakly bonded portion 47 of the present modification can be arranged with the side seal portion 43 overlapped when viewed from the front. For this reason, it is possible to apply the above-mentioned adhesive to a relatively wide region overlapping the side seal portion 43, and the bonding strength of the weakly bonded portion 47 can be adjusted in a wider range.

  FIG. 17 shows a packaging material for a pouch container according to the second embodiment of the present invention. The packaging material A2 of the present embodiment is different from the above-described embodiment in the configuration of the weak joint portion 47. In the present embodiment, the weak joint 47 is divided into a plurality of portions dotted in the vertical direction. Such a weakly bonded portion 47 can be formed by a technique such as partially heat-sealing in the vertical direction or discretely applying an adhesive in the vertical direction. According to such an embodiment as well, leakage of contents in the pouch container manufactured using the packaging material A2 can be prevented. In this invention, the aspect of the said 2nd embodiment is also included in what is provided so that the full length of the side seal part 43 may overlap.

  FIG. 18 shows an example of a method for manufacturing the packaging material A2. The manufacturing method shown in the figure shows an example in which the detailed configuration of the weakly joined portion 47 of the packaging material 2 is the same as that of the weakly joined portion 47 shown in FIG. That is, the gusset film 2 is provided with a plurality of notches or holes corresponding to the weakly bonded portions 47 of the packaging material A2 shown in FIG. 17, and through these notches or holes, the pair of exterior films 1 Part of the side ends are joined together.

  Further, in the manufacturing method shown in FIG. 18, two packaging materials A2 are sequentially manufactured from one film material F. In the figure, in the step S1 at the upper end, the film material F that has not yet been subjected to the bending process is shown, and the bending process is applied to each part of the film material F as it proceeds downward in the figure. In S5, the state where the bending process is completed is shown. In step S5, the film material F is in a state having four flat portions 1 'and four folding portions 2'. The flat portion 1 ′ is a portion that becomes the above-described exterior film 1, and the folding portion 2 ′ is a portion that becomes the gusset film 2. Points P1 to P7 in the drawing indicate, for example, points that are bent in a bending process, for example.

  A plurality of holes H are formed in the film material F. The shape and size of each hole H correspond to the weak joint 47 shown in FIG. The plurality of holes H are provided side by side in a plurality of rows. Specifically, they are the point P2 side of the point P1, the point P2 side of the point P3, the point P5 side of the point P4, and the point P5 side of the point P6. Further, the hole H adjacent to the point P1 and the hole H adjacent to the point P3 have the same position in the transport direction (vertical direction in the drawing) of the film material F. The positions of the hole H adjacent to the point P4 and the hole H adjacent to the point P6 are the same. The film material F can be appropriately formed with notches for forming the notches 22 and the oblique seal portions 45 shown in FIG. 17, but these are omitted in FIG. 18 for convenience of explanation.

  In the bending process shown in the figure, for example, two folding parts 2 'are formed by performing bending at points P2 and P3 from step S2 to step S3. Next, by bending from step S3 to step S4 at points P4 and P5, two flat portions 1 'and two folding portions 2' are further formed. Then, by bending the point P6 from step S4 to step S5 and positioning the point P7 at both ends in the center, two flat portions 1 'are formed, resulting in the state shown in step S5.

  In step S5, the hole H adjacent to the point P1 and the hole H adjacent to the point P3 are overlapped in the folding part 2 ′, and the two flat parts 1 ′ pass through the overlapped hole H. Some of them face each other. Similarly, the hole H adjacent to the point P4 and the hole H adjacent to the point P6 are in a state of being overlapped, and the two flat portions 1 ′ face each other through the overlapped hole H. It has become. After step S5, for example, the side seal portion 43 and the weakly bonded portion 47 are formed through a heat sealing step for applying the clamping force and heating described with reference to FIGS. Then, for example, by subjecting the film material F to a cutting process including cutting that separates the two points P1, two intermediate products to be the two packaging materials A2 are obtained. By repeating this process sequentially, two packaging materials A2 can be continuously manufactured.

  As can be understood from the present embodiment, the weakly bonded portion 47 is not limited to be provided continuously in the vertical direction, and may be provided in a part in the vertical direction. Further, the two weak joint portions 47 provided in the width direction may be different from each other.

  The packaging material for a pouch container and the method for manufacturing the pouch container according to the present invention are not limited to the above-described embodiments. The specific configuration of the packaging material for the pouch container and the method for manufacturing the pouch container according to the present invention can be varied in various ways.

A1, A2 packaging material B1 Pouch container 1 Exterior film 10 Exterior film material 2 Gusset film 20 Gusset film material 21 Crease 22 Notch 3 Spout 41 Top side center seal part 42 Top side seal part 43 Side seal part 44 Bottom seal part 45 Oblique seal 46 Shoulder joint 47 Weak joint M Seal mold Nz Nozzle

Claims (7)

A pair of exterior films located on the front side and the back side across the filling and pouring member disposed on the top side;
A pair of gusset films positioned between the pair of exterior films in a folded state,
A packaging material for a pouch container, comprising: 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,
The pouch is provided with a weakly bonded portion at a side end portion of the packaging material for the pouch container, which has a weaker bonding strength than the side seal portion and fixes the gusset film in a folded state. Packaging material for containers.   The packaging material for a pouch container according to claim 1, wherein the weakly joined portion is provided so as to overlap an entire length of the side seal portion.   The packaging material for a pouch container according to claim 1 or 2, wherein the weakly joined portion is formed by joining the side end portions of the pair of exterior films. Positioning the pair of exterior films on the front side and the back side, and positioning the pair of gusset films in a folded state between the pair of exterior films;
Forming a side seal portion by joining side end portions of the pair of exterior films and side end portions of the pair of gusset films;
Fixing the gusset film in a folded state with a bonding strength weaker than the side seal portion, and forming a weak bonding portion;
A method for manufacturing a pouch container, comprising:   The manufacturing method of the pouch container of Claim 4 which performs the process of forming the said side seal part, and the process of forming the said weak junction part simultaneously.   The method for manufacturing a pouch container according to claim 4 or 5, wherein, in the step of forming the weakly bonded portion, the side end portions of the pair of exterior films are bonded to each other. After the step of forming the side seal portion and the step of forming the weakly bonded portion, a leak test for inspecting the presence or absence of leakage by increasing the pressure in the space defined by the pair of exterior films and the pair of gusset films It has a process,
The method for manufacturing a pouch container according to any one of claims 4 to 6, wherein the weakly bonded portion is peeled off in the leak test step.

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