JP5224897B2 - Self-supporting bag - Google Patents

Description

  The present invention relates to a self-supporting bag, and more particularly to a self-supporting bag with improved ease of gripping a body part.

  A self-supporting bag is also called a standing pouch, and is a bag (pouch) that is provided with a town at the bottom of the bag to provide self-supporting properties. This town is called a bottom gusset and is formed by a bottom film that is folded back into a mountain fold toward the top of the bag. Due to the function of this bottom gusset, the self-standing bag has the effect of reducing the transportation cost because the volume is small and not bulky before filling the contents and after taking out the contents. It is a bag having effects such as excellent display properties and display properties. Since the self-supporting bag has such excellent characteristics, it is widely used as a package for various products such as foods such as various seasonings, liquid beverages, and jelly beverages, and toiletry products such as shampoos and liquid detergents.

  In the self-supporting bag, there is a side seal portion that integrally joins both side edges of the body film and the bottom film along the vertical direction of the bag in a state where the bottom film is inserted below the body films. Generally, the side seal part is formed by joining the body film and the bottom film in the same length. Therefore, a plurality of films are joined to the side seal part to increase rigidity. An end face is formed. Here, the self-supporting bag is a basic bag body such as light shielding property, impact resistance, abrasion resistance, heat resistance, gas barrier property, chemical resistance, etc. Since it is required to have physical properties, it is common to use films and materials having various functions in a laminated manner. However, when a film laminated in this way is used, The soft feeling of the bag is lost, and the ease of gripping is hindered. This is particularly remarkable when an aluminum-containing material such as an aluminum metal thin film is used to exhibit gas barrier properties and light shielding properties.

  In view of such a situation, several bags having improved ease of gripping the trunk have been developed. For example, Patent Document 1 discloses a container having three forms for a side gusset bag having a gusset on a side surface portion. The first form is a container that is heat-sealed in a state in which either one of the front and back surface portions or the side surface portion is shifted outward with respect to the other end portion. The second form is a container that is sheet-sealed with the outer edge regions of the end portions being in a state where the end portions of the front and back surface portions or the side surface portions coincide with each other. The third form is a container that is heat-sealed in a state in which either one of the front and back surface portions or the side surface portion is bent so as to sandwich the other end portion.

  Moreover, in patent document 2, the self-supporting bag in which the container main body which has the accommodating part with which the content is filled was formed by heat-sealing the flexible sheet | seat body from the seal part which divides an accommodating part. A self-supporting bag is disclosed in which a folded piece is extended, the folded piece is bent toward the housing portion, and the posture is maintained.

JP 2002-68220 A JP 2003-261150 A

  According to the configuration of the container disclosed in Patent Document 1, it is possible to improve the ease of gripping the body part. However, it is difficult to apply the configuration to a self-supporting bag. This is because, as shown in FIG. 5, the self-supporting bag is usually manufactured from a long film body that is continuous in the lateral direction (width direction) of the bag. That is, two long bodies of the body film forming the front and back surfaces are overlapped, and the length of the bottom film folded back in a mountain fold toward the inside of the long body between the two long bodies. After the scale is inserted and heat-sealed to form the bottom seal portion 14, the side seal portion is formed by heat-sealing along the width direction of the long body (that is, the vertical direction of the bag), and then the side seal portion. A bag main body is manufactured by cutting the central portion of the bag. Therefore, since the edge part of the side seal part of a self-supporting bag is formed by cutting, the structure disclosed in Patent Document 1 is manufactured (for example, heat sealing is performed by shifting one of the front and back film parts). The configuration, the configuration in which either one of the front and back surfaces of the film is folded so as to sandwich the other end, etc.) are not actually applicable. Here, after cutting the center part of the side seal part, it is possible to fold and fix the end part of the side seal part to manufacture a self-supporting bag. In this case, the bottom film is sandwiched between the side seal parts. Since the part is composed of four films that are folded and overlapped to form a total of eight parts, it is difficult to maintain the actual folded state due to its thickness and rigidity, and in order to fix it in the folded state In addition, it must be processed so as to be heat-sealed by providing holes or notches at the corresponding positions of the film on the front and back surfaces in advance, which is not preferable from the viewpoint of productivity.

  On the other hand, according to the self-supporting bag disclosed in Patent Document 2, the amount of film used increases, so the material cost increases, and the size of the storage portion decreases, so that the content filling amount decreases. Occur. Furthermore, since the shape of the bag is limited, some products may not be preferable from the viewpoint of design.

  An object of the present invention is to provide a self-supporting bag that is easy to grip a body part and is excellent in cost (material cost / process cost) performance.

The self-supporting bag according to the present invention is composed of a pair of body film forming the front and back surfaces, and a bottom film folded back in a mountain fold toward the upper side of the bag, and the bottom film is a lower part of both body film A crease formed in the side seal portion along the vertical direction in a self-supporting bag comprising a side seal portion integrally joined along the vertical direction of the bag with both side edges of both the body film and the bottom film inserted in When the side seal portion is pressed from the width direction of the self-supporting bag, and a cut portion cut to a position at least in contact with the crease line of the side seal portion along the direction intersecting the vertical direction The side seal portion is folded back starting from the cut portion.

  Moreover, it is preferable to have at least one notch part in the site | part which adjoins from the upper end of the part to which the bottom part film of the side seal part was joined.

Moreover, the fold line is preferably a line which includes a microporous or recess.

  According to the self-supporting bag according to the present invention, the side seal portion has a cut portion cut into a predetermined length, and when the side seal portion is pressed from the width direction of the self-supporting bag, the side portion starts from the cut portion. Since the seal portion is folded back, when the body portion is gripped, the above-mentioned joint end surface can be prevented from touching the hand, and the hand of the bag can be softened to greatly improve the ease of gripping. . In addition, the shape of the self-supporting bag is not limited, the film on the front and back surfaces does not require special pre-processing such as holes and notches, and can be manufactured by the same manufacturing process as the conventional one, so it is excellent in cost performance. .

  In addition, if the structure having at least one cut portion is provided at a position close to the upper end of the portion where the bottom film of the side seal portion is joined, the side seal portion can be easily folded when the body portion is gripped. In addition, the ease of gripping can be improved. Generally, the portion gripped when drinking the contents is the central portion of the body portion, and therefore, the force from the width direction of the bag is applied to the portion adjacent to the upper end of the portion where the bottom film is joined. Since it is not a part to be added and to be in direct contact with the gripping hand, it is suitable as a position for providing the cut portion.

  In addition, if the side seal portion has a crease line including a minute hole or a recess along the vertical direction of the bag, the folding function of the side seal portion by the cut portion can be compensated. That is, the force required for folding the side seal portion can be reduced by the crease line. Therefore, it is possible to further improve the ease of gripping as compared with the configuration having only the cut portion.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view (before filling contents) of a self-supporting bag provided with a cut portion and a crease line in a side seal portion. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a front view of a self-supporting bag having a large number of cut portions in the side seal portion.

  As described above, the self-supporting bag 10 is a bag that is provided with a town called a bottom gusset at the bottom of the bag so as to be self-supporting when the contents are filled. As shown in FIG. 1, the self-supporting bag 10 includes a pair of body film 11 that constitutes the front and back surfaces, and a bottom film 12 that is folded back into a mountain fold toward the upper side of the bag. The bottom film 12 is a member that performs the function of a town called a bottom gusset.

  At the upper part of the free-standing bag 10, a spout 13 composed of a spout and a cap screwed into the spout can be provided. The contents filled in the bag can be easily taken out through the spout of the plug 13. The shape and installation position of the plug can be arbitrarily set according to the type and design of the contents. Further, a chuck or the like can be provided in place of the plug 13. Below, although the self-supporting bag 10 demonstrates as a bag provided with the spigot 13, it is not limited to this.

  As described above, the body film 11 is a film constituting the front and back surfaces of the self-supporting bag 10. The body part film 11 can be formed by folding a single film, but is preferably formed of two films from the viewpoint of improving productivity. The bottom film 12 is a film that forms the bottom surface of the self-supporting bag 10. As shown in FIG. 1, the bottom film 12 is folded in a mountain fold toward the upper side of the bag and inserted into the lower part of the body part film 11 that forms the front and back surfaces.

  As shown in FIG. 1, the self-supporting bag 10 is formed by integrally joining two body film 11 and bottom film 12. In a state where the bottom film 12 folded back in the mountain fold is inserted into the lower part of the two body part films 11 forming the two front and back surfaces, the peripheral part of the bottom film 12 is joined to the body part film 11 to form the bottom seal part 14. It is formed. In a state where the bottom film 12 is folded in a mountain shape, the portion excluding the bottom seal portion 14 has an arc shape, and the bow shape portion is developed by filling the contents to become a boat bottom shape bag bottom portion 15. .

  As will be described later, the body film 11 and the bottom film 12 are composed of laminated films having excellent rigidity and shape retention, but the bottom seal portion 14 that is a joint between the body film 11 and the bottom film 12 is The rigidity is particularly high. By using the bottom seal portion 14 having high rigidity as a leg, the self-supporting bag 10 can obtain stable self-supporting properties. Although the self-supporting bag 10 is described as having a bow-shaped bag bottom portion 15, the shape of the bag bottom portion 15 is not limited to this, and various known shapes can be applied. Here, the method for joining the films is not particularly limited, but is preferably performed by heat sealing from the viewpoint of improving productivity and reducing environmental burden.

  As described above, the self-supporting bag 10 is formed in such a manner that both side edges of both the body film 11 and the bottom film 12 are arranged in the vertical direction of the bag in a state where the bottom film 12 is inserted below the both body films 11. The side seal part 16 integrally joined from the upper end to the lower end is provided. The side seal part 16 includes a part where the body part films 11 forming the front and back two surfaces are joined to each other at the upper part of the bag, and a bottom part film 12 folded back into the body part film 11 and the mountain fold at the lower part of the bag. There is a portion where is joined. Hereinafter, the former will be described as the upper side seal portion 17 and the latter as the lower side seal portion 18.

  As described above, the self-supporting bag 10 has the long body of the body film 11 that forms the front surface and the back surface, and the bottom film 12 that is folded back in a mountain fold toward the upper side of the bag. Since the body is inserted and heat-sealed along the vertical direction of the bag in this state to form the side seal portion 16, the side seal portion 16 has a joint end surface with a plurality of films joined to increase rigidity. It is formed. For example, in the upper side seal portion 17, a joining end surface is formed by two films.

  The lower side seal portion 18 is provided on the other side of the body film 11 that forms the front surface and the bottom film 12 that is folded back into a mountain fold, and the body film 11 that forms the back surface and the bottom film 12 that is folded back into a mountain fold. The surfaces are joined to each other. Accordingly, a joining end surface is formed by four (four pieces) films (the bottom films 12 are not joined together). In addition, a part of the lower side seal part 18 is provided with a notch part 19 in which a part of the bottom film 12 is cut out to join the two body part films 11 to each other, and the stable self-supporting property of the self-supporting bag 10 is ensured. It has a function to do.

  As described above, the plug 13 is installed on the upper edge portion of the body part film 11, and the upper end seal part 20 that joins the two body part films 11 is formed by sandwiching the spout. The two seal portions and the upper end seal portion 20 form a sealed internal space, and the internal space is filled with contents through, for example, a spout of the spigot 13. As will be described later, these seal portions can be formed simultaneously.

  The body film 11 and the bottom film 12 constituting the self-supporting bag 10 are required to have basic performance as a packaging body such as impact resistance, wear resistance, heat resistance and gas barrier properties as well as self-supporting properties. Therefore, it is preferable to be made of a material excellent in rigidity and shape retention. In addition, these films preferably include a sealant layer in order to form a seal part including the side seal part 16 and the like by heat sealing. Therefore, the film constituting the body film 11 and the bottom film 12 is preferably composed of a laminated film including a sealant layer and a base film layer. The sealant layers of the respective films are overlapped and bonded so as to be inside the bag.

  Examples of the film constituting the base film layer include 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) and ethylene-vinyl alcohol copolymer (EVOH) can be used.

  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 film can be used.

  As a method for laminating the films constituting the base film layer and the sealant layer, known methods such as a dry lamination method and a hot melt lamination method can be used. The laminated film can also be produced by coextrusion using the above resin material.

  When the contents are food or the like, the resin film constituting the bag preferably has a gas barrier layer. As the gas barrier layer, a metal thin film such as aluminum, a resin film such as vinylidene chloride (PVDC), ethylene-vinyl alcohol copolymer (EVOH), or an arbitrary synthetic resin film is coated with an inorganic oxide such as aluminum oxide or silica. A vapor-deposited transparent vapor deposition film or the like can be provided. When the gas barrier layer is provided, the configuration thereof is not particularly limited, and for example, the gas barrier layer can be provided between the base film layer and the sealant layer. As a method for forming these thin films, a known method such as a vapor deposition method or a sputtering method can be applied. An adhesive layer may be provided between the gas barrier layer and the base film layer.

  The body part film 11 can be provided with a printing layer such as a product name, a product image, or a design (not shown) indicating the quality of the product on the surface, that is, the front and back surfaces of the self-supporting bag 10. This printed layer is generally provided on the inner surface of the base film layer.

  The self-supporting bag 10 is a self-supporting bag that is easy to grip the body part and has excellent cost performance including material cost and process cost. In order to improve the ease of gripping the body part, A cut portion 21 is provided. As shown in FIG. 1, the cut portion 21 is a cut portion of the side seal portion 16 cut by a predetermined length along a direction intersecting the vertical direction of the bag.

  The length of the cut portion 21, that is, the predetermined length is a length that makes the body portion easy to grip and does not deteriorate the sealing performance of the side seal portion 16. The length for improving the ease of gripping the body portion is that the side seal portion 16 is pressed from the width direction of the self-supporting bag 10 when the body portion is gripped, and the cut portion 21 is the starting point. This is a length that allows the side seal portion 16 to be folded back. Specifically, the length of the cut portion 21 is 1/10 or more and 9/10 from the outside of the bag with the length in the lateral direction (width direction) of the side seal portion 16 as a reference (the total length is the denominator; the same applies hereinafter). The length is preferably the following length, more preferably 2/10 or more and 8/10 or less, and particularly preferably 3/10 or more and 7/10 or less.

  As described above, the position where the cut portion 21 is provided is the side seal portion 16, and among them, at least one portion is located near the upper end of the lower side seal portion 18, that is, near the lower end of the upper side seal portion 17. It is preferable to have two cut portions 21. Specifically, the position where the cut portion 21 is provided is a position less than 3/10 from the lower end portion (the position in contact with the lower side seal portion 18) with reference to the length of the upper side seal portion 17. The position is more preferably less than 2/10, particularly preferably less than 1/10. In general, the portion gripped when drinking the contents is the central portion of the upper side seal portion 16, and therefore, the portion close to the upper end of the lower side seal portion 18 has a bag when gripped. Since it is not a part where a large force is applied from the width direction and the hand to be gripped is not directly touched, it is suitable as a position where the cut portion 21 is provided. In addition, since the position where the cut portion 21 is provided varies somewhat depending on the size and shape of the self-supporting bag 10, it can be appropriately set according to the form of the self-supporting bag 10. Further, printing or the like for specifying an appropriate position to be gripped can be provided on the side seal portion 16 or the like.

  The number of the cut portions 21 is preferably at least one, that is, one on each of the left and right side seal portions 16, and more preferably two or more (four or more on the left and right). In the configuration in which two cut portions 21 are formed, it is preferable to set the interval between the cut portions 21 to be equal to or slightly longer than the gripped range. Specifically, when the cut portion 21 on the bag lower side is formed at a position 1/10 from the lower end portion of the upper side seal portion 17, for example, the other cut portion 21 is the upper side seal portion. It is preferable to be formed at a position of 1/10 or more and 7/10 or less from the upper end portion, more preferably 2/10 or more and 6/10 or less, and particularly preferably 3/10 or more and 5/10 or less.

  The shape of the cut portion 21 is not particularly limited as long as it has the above-described predetermined length and the like and is formed along the direction intersecting the up and down direction of the bag. The cut portion 21 shown in FIG. 1 and the like is formed along a direction orthogonal to the vertical direction of the bag, but may be a cut portion 21 along an oblique direction with respect to the vertical direction of the bag. Moreover, since a hand may touch the notch part 21, as shown in FIG. 2, the outer side edge part of the notch part 21 can be made into the rounded shape. Such a shape is preferable because the hand of the bag is soft even when the hand touches the cut portion 21. Moreover, it can also be set as the shape where the width | variety of cutting (length with respect to the up-down direction of a bag) is large. The cut portion 21 can be provided by processing with a punching blade such as a die set or a die cut roll.

  Further, as shown in FIG. 3, the self-standing bag 10 can be provided with a large number of cut portions 21. By providing a large number of cut portions 21, the side seal portion 16 can be folded back more easily when the side seal portion 16 is pressed from the width direction of the bag. In particular, when a large number of the cut portions 21 are provided as described above, it is preferable that the outer end portion of the cut portion 21 has a rounded shape.

  Further, the side seal portion 16 can be provided with a crease line 22 along the vertical direction of the bag in order to supplement the function of the cut portion 21. The crease line 22 is a portion that is bent when the side seal portion 16 is pressed from the width direction. The crease line 22 can reduce the force required for folding the side seal portion 16. Therefore, it is possible to further improve the ease of gripping compared to the configuration having only the cut portion 21.

  The crease line 22 that complements the function of the cut portion 21 is a line including a minute hole or a recess (including one formed by embossing). That is, the crease line 22 is a line referred to as a perforation or a half cut, or a line formed by embossing, and can have the same configuration as a known one. The configuration is, for example, a configuration in which micropores or recesses are repeated in an arbitrary pattern (broken line shape) or continuously (linear shape). The crease line 22 can be provided by machining with a sewing machine blade, half-cut blade, die-cut roll, push blade, laser machining, embossing, or the like.

  Since the crease line 22 supplements the function of the cut portion 21, the crease line 22 is preferably provided at a position in contact with the cut portion 21. That is, when the cut portion 21 has a length cut to the center portion of the side seal portion 16, the crease line 22 is preferably provided outside the center portion of the side seal portion 16. More preferably, it is provided at the center of the side seal portion 16 in contact with the end of 21.

  As described above, the body portion of the self-supporting bag 10 is gripped when the contents are squeezed out, or when the contents are a liquid drink and are drunk from the spigot 13. When gripping the body part, the hand touches the side seal part 16, and the side seal part 16 is pressed from the width direction of the bag. As shown in FIG. 4, according to the self-supporting bag 10 having the above-described configuration, since the cut portion 21 is provided, when the side seal portion 16 receives a force from the width direction of the bag indicated by the arrow, The seal portion 16 is folded back. Therefore, since the self-supporting bag 10 is gripped in a state where the side seal portion 16 is folded back, it is possible to prevent the joint end surface of the side seal portion 16 from touching the hand.

  In addition, the self-supporting bag 10 is provided with a crease line 22 that compensates the folding of the side seal portion 16 by the cut portion 21 at a position along the vertical direction of the bag and in contact with the cut portion 21. The force required to fold back the side seal part 16 by the crease line 22 is greatly reduced, and when the hand touches the side seal part 16, the side seal part 16 is bent as shown in FIG. You can also. For example, if the number of minute holes or the like of the crease line 22 is increased, the force required for folding can be further reduced.

  The self-supporting bag 10 having the above-described configuration can be manufactured, for example, by the following process. Specifically, first, a long body of a laminated film to be the body film 11 and the bottom film 12 is prepared by laminating each resin film constituting a base film layer, a sealant layer, and the like. Next, as shown in FIG. 5, two long bodies of the body part film 11 forming the front and back surfaces are overlapped, and a mountain is formed between the two long bodies toward the inside of the long body. After inserting the long body of the bottom film 12 folded back and heat-sealing to form the bottom seal portion 14, heat sealing is performed along the width direction of the long body (that is, the vertical direction of the bag). A seal portion 16 is formed. Then, after shape | molding a bag main body by cut | disconnecting the center part of the side seal part 16, the upper end seal part 20 which pinched | interposed the stopper 13 is formed, and the self-supporting bag 10 is manufactured.

  When the central portion of the side seal portion 16 is cut, or before and after that, the cut portion 21 and the crease line 22 are formed. When the crease line 22 is provided by embossing, it is preferable to provide the crease line 22 without changing the conventional manufacturing process by providing irregularities on the heat seal bar forming the side seal portion 16. The cut portion 21 is usually formed before the center portion of the side seal portion 16 is cut by a punching blade such as a die set. For example, when the cut portion 21 is provided by a die cut roll, A part of the die cut roll provided with a linear blade along, specifically, a portion protruding along the direction intersecting the vertical direction of the bag is provided at the position where the cut portion 21 is formed, and this die cut roll is used. By doing so, the cutting of the bag and the formation of the cut portion 21 can be performed simultaneously. As described above, the self-supporting bag 10 of the present invention with greatly improved gripping ability can be manufactured without greatly changing the conventional manufacturing process.

  As described above, the self-supporting bag 10 is located along the direction intersecting the up and down direction of the bag at a site close to the upper end of the side seal portion 16, particularly the lower side seal portion 18 that is a portion to which the bottom film 12 is joined. Since it has the notch part 21 and has the crease line 22 along the up-down direction of the side seal part 16, when the side seal part 16 is pressed from the width direction of the bag, the notch part 21 is set as a starting point by a small force. The side seal portion 16 can be folded back. Therefore, when the body portion is gripped, it is possible to suppress the above-described joint end surface from touching the hand, and the handle of the bag becomes soft and the ease of gripping can be greatly improved. In addition, the shape of the self-supporting bag 10 is not limited, the film on the front and back surfaces does not require special pre-processing such as holes and notches, and can be manufactured by the same manufacturing process as the conventional one, so the cost performance is also improved. Excellent.

It is a front view (before filling of the contents) of a self-supporting bag provided with a cut portion and a crease line in the side seal portion. FIG. 2 is an enlarged view of a main part of FIG. It is a front view of the self-supporting bag provided with many cutting parts in the side seal part (a part of numerals are omitted for clarification). It is a figure which shows a mode when a side seal part is pressed from the width direction of a self-supporting bag in FIG. It is a schematic diagram which shows a part of manufacturing process of a general self-supporting bag (a part of reference numerals are omitted for clarity).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Self-supporting bag, 11 Body part film, 12 Bottom film, 13 Plug, 14 Bottom seal part, 15 Bag bottom part, 16 Side seal part, 17 Upper side seal part, 18 Lower side seal part, 19 Notch part, 20 Upper end Seal part, 21 notch part, 22 crease line.

Claims (3)

It is composed of a pair of fuselage film forming the front and back surfaces, and a bottom film folded back in a mountain fold toward the upper side of the bag, and the two fuselage with the bottom film inserted into the lower part of the two fuselage film In a self-supporting bag comprising a side seal part that integrally joins both side edges of the part film and the bottom film along the vertical direction of the bag,
A crease line formed in the side seal portion along the vertical direction ;
A cut portion cut to a position at least in contact with the crease line of the side seal portion along the direction intersecting the vertical direction ;
Have
A self-supporting bag, wherein when the side seal portion is pressed from the width direction of the self-supporting bag, the side seal portion is folded back from the cut portion. In the self-supporting bag according to claim 1,
A self-supporting bag comprising at least one cut portion at a portion adjacent to an upper end of a portion where the bottom film of the side seal portion is joined. In the self-supporting bag according to claim 1 or 2,
Crease lines, self-standing bag, characterized in that a line containing a microporous or recess.

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