JP2015212149A - Method for manufacturing self-standing pouch and intermediate product used in method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide manufacture of a self-standing pouch which is designed to suppress bending in the middle occurring in a self-standing state and has an excellent appearance.SOLUTION: After an intermediate product which has at least a body part Pa and a bottom part gusset part Pb and has an upper part opened while one pleat part and the other pleat part in the bottom part gusset part Pb are not bonded is manufactured, contents are filled from an opening of the intermediate product, and one of the pleat part and the other pleat part in the bottom part gusset part are bonded after forming an upper part seal part to close the opening. When the bottom part gusset part is bound by bonding one of the pleat part and the other pleat part in the bottom part gusset part after filling, the contents move to an upper part of a pouch, and a dead space becomes small. Consequently, the self-standing pouch has an excellent appearance when standing by itself after filling the contents.

Description

  The present invention mainly belongs to the technical field of packaging bags for storing and selling liquids, and more particularly relates to a self-supporting bag that can self-support itself in a state where the liquid is filled as a content. is there.

  In general, a self-supporting bag (standing pouch) is manufactured by sandwiching another bottom film folded in a mountain shape between the lower and lower body film made of a flexible laminated film and heat-sealing the surroundings, or 1 It is manufactured by folding the bottom of the laminated film into a W shape and heat-sealing the surroundings, and filling the liquid as the contents allows the bottom to expand and become self-supporting. Therefore, it is suitably used as an alternative container for shape retaining containers such as bottles and cartons, or as a refill container for replenishing bottles with contents.

Japanese Patent Laid-Open No. 9-254997

  The above-mentioned self-supporting bag is sent to the filling process in the form of a folded intermediate product whose upper part is not closed, and in this process, the liquid as the contents is filled by the filling machine. Specifically, the upper part of the left and right side seal parts in the intermediate product is grasped and spread, and after filling the contents by inserting an injection tube there, heat sealing is performed so as to close the opening and the upper seal part is Form. At this time, since it is pulled from the left and right and heat-sealed by the sealing head, those spaces are necessary, and a dead space in which the contents are not filled is generated in the upper part of the bag.

  Since a self-supporting bag filled in this way has a dead space in which the contents are not filled at the top of the bag, when it is made to stand on its own, it will bend in the vertical direction at the center in the width direction of the bag due to the weight of the contents. ") Will occur. When this breakage occurs, not only is the shape of the bag distorted and unsightly, but the pattern printed on the surface of the bag also collapses, and there is a problem that it does not look good as a product when arranged at the storefront. .

  The present invention has been made in view of such a background, and an object of the present invention is to provide a good-looking self-supporting bag that suppresses the folding that occurs in a self-supporting state, and also to It is to provide an intermediate product used in the manufacturing method.

  In order to achieve the above object, a method for manufacturing a self-supporting bag according to the present invention has at least a trunk portion and a bottom gusset portion, and one fold portion and the other fold portion in the bottom gusset portion are not bonded. After producing an intermediate product with an open top in the state, after filling the contents from the opening of the intermediate product and forming an upper seal part to close the opening, one pleat part in the bottom gusset part and It is characterized by adhering the other fold.

  In addition, the intermediate product of the present invention has at least a body portion and a bottom gusset portion, and the upper portion is opened in a state where one fold portion and the other fold portion in the bottom gusset portion are not bonded. And

  Further, the intermediate product of the present invention is the intermediate product having the above-described configuration, wherein the bottom surface of the bottom gusset portion is formed by connecting the front side portion and the back side portion via a broken line, and at least on both sides of the front side portion and the back side portion. It can take a form in which either a notch or a hole is formed.

  According to the manufacturing method of the self-supporting bag of the present invention, after filling the contents from the top in a state where one pleat portion and the other pleat portion in the bottom gusset portion are not bonded, one side in the bottom gusset portion is filled after filling. When the pleat and the other pleat are bonded to restrain the bottom gusset, the contents move to the top of the bag and the dead space becomes smaller. Sex bags can be manufactured.

It is a front view which shows an example of the intermediate product used with the manufacturing method of this invention. It is explanatory drawing which shows the intermediate product shown in FIG. 1 in a decomposition | disassembly state. It is explanatory drawing of the principal part corresponding to the AA cross section in FIG. It is explanatory drawing of the principal part corresponding to the BB cross section in FIG. It is explanatory drawing equivalent to FIG. 4 of the conventional intermediate product. FIG. 1 shows a bag in which one pleat portion of the bottom gusset portion and the other pleat portion are not bonded to each other after filling the contents of the intermediate product of FIG. 1 to form an upper seal portion. It is explanatory drawing. It is explanatory drawing shown in the state which looked at the self-supporting bag manufactured with the manufacturing method of this invention from the side. It is explanatory drawing shown in the state which looked at the conventional self-supporting bag from the side.

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

  1 is a front view showing an example of an intermediate product used in the manufacturing method of the present invention, FIG. 2 is an explanatory view showing the intermediate product shown in FIG. 1 in an exploded state, and FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is an explanatory view of the main part corresponding to the BB cross section. In the following description, the expressions “front” and “back” are used for the same two members, but this is for easy understanding of the description, and there is no special meaning beyond that.

  As shown in FIG. 2, the intermediate product is composed of front and back wall films 1 and 2 and a bottom film 3 in which a front side portion 3m and a back side portion 3n are connected via a broken line. The bottom film 3 forms a bottom surface of a bottom gusset portion described later. In these films, a packaging material in which at least a base material layer and a sealant layer are laminated from the outer surface is used, and the bottom film 3 in a folded state is sandwiched between the front and back wall films 1 and 2, and the boat bottom The intermediate product shown in FIG. 1 is bag-made by heat-sealing at the bottom seal portion 4 and heat-sealing at the side seal portions 5 and 6 along the left and right edges.

  In the intermediate product, a bottom gusset portion is formed by a part of the front and back wall films 1 and 2 and the bottom film 3, and a body portion is formed by a portion excluding the bottom gusset portions of the front and back wall films 1 and 2. . As shown in FIG. 3, the bottom gusset portion is composed of one pleat portion Gm and the other pleat portion Gn, and the front side portion 3 m of the bottom film 3 and the front side of the bottom film 3 of the wall film 1 on the front side. One pleat portion Gm is formed by the portion facing the portion 3m, and the other pleat portion Gn is formed by the portion facing the back side portion 3n of the bottom film 3 and the back side portion 3n of the bottom film 3 of the wall film 2. In FIG. 1, the body portion is indicated by a symbol Pa, and the bottom gusset portion is indicated by a symbol Pb. In the intermediate product of this embodiment, semicircular cutouts 3h are formed on both sides of the bottom film 3 in a folded state as shown in FIG.

  And when this intermediate product forms the side seal parts 5 and 6, as shown in FIG. 4, one pleat part Gm and the other pleat part Gn in the bottom gusset part are not bonded, that is, The wall surface films 1 and 2 are not bonded to each other at the notch 3h in the bottom film 3. Thereby, the side edge part of the wall surface films 1 and 2 which oppose, and the peripheral part of the bottom face film 3 are heat-sealed, and the upper part is open in the state which the wall surface films 1 and 2 are not adhere | attaching in the notch 3h. A product is obtained.

  On the other hand, in the conventional intermediate product, as shown in FIG. 5, when the side seal portions 5 and 6 are heat sealed, the wall surface films 1 and 2 adhere to each other at the notch 3h in the bottom film 3, thereby One pleat part and the other pleat part in the gusset part are bonded.

  The intermediate product in FIG. 1 is sent to the filling process in a state of being grouped into a plurality of sheets, where the contents are filled one by one, and the contents are contained as shown in FIG. Specifically, the contents are filled from the opening whose upper part is widened, and the sealing part 7 between the wall surface films 1 and 2 is heat-sealed so as to close the opening to form the upper sealing part 8 having a predetermined width. In FIG. 6, the upper edge level of the contents is indicated by L, and the area above L of the contents accommodating portion is a dead space. In the filling process, when the content is filled with the upper edge level L of the content exceeding a certain line, the sealing of the upper seal portion 8 may be caused by sandwiching the content. Therefore, the contents are filled so that the upper edge level L of the contents does not exceed a certain line.

  After forming the upper seal portion 8 in this way, one pleat portion Gm and the other pleat portion Gn in the bottom gusset portion are bonded to form a self-supporting bag in the state shown in FIG. Thereby, the space | interval of the wall surface film 1 and the wall surface film 2 becomes narrow, a content moves to the upper part of a bag, and a dead space becomes small. At this time, you may adhere | attach in the state turned upside down as needed. And when the intermediate product of FIG. 1 is used, it heat-seal | sticks and adheres with the mutual sealant layer in the wall films 1 and 2 of the front and back in the notch 3h in the bottom face film 3. FIG. Alternatively, hot melt may be applied to the bottom surface, and the front side portion 3m and the back side portion 3n of the bottom film 3 may be bonded.

  A hole may be formed instead of the notch 3h of the bottom film 3, and the front and back wall films 1 and 2 may be bonded to each other through this hole. And when adhering the wall films 1 and 2 of the front and back through the notch 3h or a hole, it is preferable to form the notch 3h or the hole outside the inner seal line of the side seal portions 5 and 6.

  In the case of a conventional self-supporting bag, that is, a self-supporting bag that forms the upper seal portion 8 after filling an intermediate product in which the bottom gusset portion is constrained, as described above, it exceeds a certain line. If the contents are filled in, the sealing failure of the upper seal portion 8 may occur, so the contents cannot be filled beyond a certain line, and the dead space cannot be reduced. On the other hand, in the self-supporting bag of FIG. 7, after filling the intermediate product of FIG. 1 in which the bottom gusset portion is not constrained and forming the upper seal portion 8, one pleat portion Gm in the bottom gusset portion and the other Since the pleat portion Gn is bonded and the bottom portion is restrained, the contents move to the upper portion of the bag and the dead space is reduced. Therefore, unlike the conventional self-supporting bag shown in FIG. 8, a large dead space is not formed in the upper part of the bag, and it is less likely to bend. The shape-retaining properties of 1 and 2 are good, and the appearance when the contents are filled and self-supported is good.

  Needless to say, the self-supporting bag of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, the above-mentioned self-supporting bag is configured by separately forming the two wall film 1 and 2 and the bottom film 3 folded in two, which form the body, but the self-supporting bag of the present invention is a bottom film. 3 may be connected to either or both of the front and back wall films 1 and 2 via a broken line. That is, it may be composed of one or two films.

  The self-supporting bag of the present invention is preferably used mainly for storing and selling liquids, but can also be used for storing powders, granules and the like.

DESCRIPTION OF SYMBOLS 1, 2 Wall film 3 Bottom film 3h Notch 3m Front side part 3n Back side part 4 Bottom seal part 5,6 Side seal part 7 Planned seal part 8 Upper seal part Gm One pleat part Gn The other pleat part Pa trunk part Pb Bottom part Gazette part

Claims (3)

  A method for manufacturing a self-supporting bag, having at least a body portion and a bottom gusset portion, and an intermediate product having an open top in a state where one fold portion and the other fold portion of the bottom gusset portion are not bonded to each other After filling the contents from the opening of the intermediate product, forming the upper seal part to close the opening, and then bonding one pleat part and the other pleat part in the bottom gusset part A method for manufacturing a self-supporting bag.   An intermediate product comprising at least a body portion and a bottom gusset portion, wherein an upper portion is opened in a state where one fold portion and the other fold portion of the bottom gusset portion are not bonded. The bottom surface of the bottom gusset portion is formed by connecting a front side portion and a back side portion through a broken line, and at least either a notch or a hole is formed on both sides of the front side portion and the back side portion. The intermediate product according to claim 2.

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