JP2014131929A - Self-standing gusset packaging bag and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inflation packaging-type self-standing gusset packaging bag that has high self standing stability by employing an artful gusset structure.SOLUTION: In a self-standing gusset packaging bag 11, three bottom ribs 35-37, which are provided on a bag bottom, serve as a part of a bag stand. Additionally, the packaging bag 11 is provided with corner bottom ribs 41-44 that self-stand at right and left front corner parts and right and left rear corner parts on the lower side of the bag, respectively, and the corner bottom ribs serve as the rest of the bag stand. Recess-shaped overlap avoiding parts 51 are formed on both sides of a bag bottom surface part 20, respectively.

Description

  The present invention relates to a packaging bag with a self-supporting gusset that can exhibit stable self-supporting property in an article storage state, and a method for manufacturing the same.

  As is well known, in the packaging field of foods, medicines, medical products, miscellaneous goods, etc., packaging bags made mainly of synthetic resin sheet films are used to wrap certain articles (products or goods). Is widely adopted. Such packaging bags also include various types such as a self-supporting type, a non-self-supporting type, a type with a gusset, and a type without a gusset.

  Among the above, non-self-supporting packaging bags are not self-supporting, and thus are restricted in layout at the time of product display and are not convenient to use. On the other hand, the non-self-supporting type has the advantage of simple manufacturing and low cost. In contrast, the self-supporting packaging bag has a high degree of freedom in product layout and can be said to be easy to use because it can stand on its own. However, the manufacturing difficulty and cost tend to increase accordingly. Whether to use the self-supporting type or the non-self-supporting type is determined based on the type, capacity, price, etc. of the package.

  On the other hand, in the case of a packaging bag with a gusset, it swells at the time of filling an object to be packaged, and the accommodation amount increases in proportion to the width of the bag, which is desirable in practice. In addition, when it is empty, such as an unused state, it can be folded into a flat state that is not bulky, and this is also evaluated as desirable.

  Regarding the relationship between the free-standing packaging bags and the packaging bags with gussets, many of the free-standing packaging bags have gussets. One of the reasons is that, as described above, the bag bottom side when the packaged item is filled swells greatly with a gusset. That is, since the bottom side swells greatly, the center of gravity of the bag is lowered, thereby improving the self-supporting stability of the bag.

  The following prior art documents (Patent Documents 1 to 6) relate to some typical packaging bags. Among these, what was disclosed by patent document 1 is a non-self-supporting packaging bag without any gusset. Patent Document 2 discloses a non-self-supporting packaging bag having a single-type side gusset. Regarding Patent Document 3, one disclosed here is a self-supporting packaging bag having a single-type side gusset and a single-type bottom gusset. Patent Document 4 discloses a self-standing packaging bag having a single-type bottom gusset and a self-standing packaging bag having a double-type bottom gusset. Also disclosed in Patent Document 5 is a self-standing packaging bag having a single-type bottom gusset, a double-type bottom gusset, and the like. One of those disclosed in Patent Document 6 is a self-supporting packaging bag having a single-type side gusset and a single-type bottom gusset.

  Many packaging bags with gussets are provided in addition to Patent Documents 2-6. Some of them have one of a single-type side gusset, a single-type bottom gusset, a double-type side gusset, and a double-type bottom gusset. The other part includes a single-type or double-type side gusset and a single-type or double-type bottom gusset.

  When it comes to conventional packaging bags with gussets, most of them are filled and packaged with various items to be packaged by utilizing the fact that the bags swell with gussets. This is a characteristic of this bag, and product packaging and the like are performed taking advantage of this characteristic. On the other hand, there is a product that does not make this a “good” for a packaging bag with a high-function gusset that swells greatly with a margin. A typical example is “tea leaves” described below.

  Tea leaves are light and have a small amount of bagging per bag. When bagging a small amount of light tea leaves, a vertically long and flat bag is usually used. One example is a flat bag as seen in Patent Document 1. The tea leaves packed in this type of bag become thin and almost evenly distributed throughout the bag. That is, tea leaves are packaged and displayed without being unevenly distributed in a part of the bag. This is because “the space in the bag can be used effectively and the storage balance is good”, “the appearance of the packaging is good because the part of the bag does not bulge out excessively”, “ It can be said that the lack of a gusset, such as “it is easy to maintain high quality because the objects do not overstress each other”, has led to good results. As another example, a packaging bag with a single type side gusset as seen in Patent Document 2 is also used for packaging tea leaves. The packaging bag with a gusset in this case is provided with a side gusset, but by maintaining the thin shape of the bag by reducing its width, it is possible to obtain the desired packaging state as described above. -ing

  As described above, the vertically long and flat packaging bag is suitable for packaging such as tea leaves, sprinkled foods, and similar products of that kind. However, flat packaging bags also have drawbacks. It is a lack of independence. The reason why the flat packaging bag is not self-supporting is because it does not have a shape or structure for self-supporting.

  In the case of products that are not self-supporting (non-self-supporting packaging products), there are many restrictions on the display of the products, and there are even inconveniences. That means that a large amount of installation space is consumed when the packaged goods are arranged in such a manner that the cards are arranged in a display place. In addition, product stacking in a flat state at the time of display cannot sufficiently show the quantitative scale of the displayed product to the visitor, and depending on the type of package, the lower product is the higher product. It tends to cause pressure deformation to receive the weight of. On the other hand, bag-packed foods (eg, sprinkled foods) that cannot be used in the stand state become annoying to grab because the bags fall over.

  As the above-mentioned countermeasure, it is as if the gusset structure as shown in Patent Documents 3 to 6 is introduced into a predetermined portion of the packaging bag and the bag is changed to a self-supporting type. However, the introduction of the gusset structure is a factor that prevents this from being in conflict with the flatness of the packaging bag. If the flatness of the packaging bag cannot be maintained due to the introduction of the gusset structure, in the packaging of tea leaves and other products, “effective use of the space in the bag and a good storage balance”, “paste appearance of the packaging by preventing local expansion of the bag” The above-mentioned good results cannot be obtained, such as "the mutual contents are easy to maintain high quality by preventing excessive compression between each other". Therefore, there is a new need for a technology that can maintain both flat packaging and bag independence.

  The establishment of the self-supporting property of the packaging bag is not limited to the above-described packaging bag that can meet the demand for flat packaging, but can also be said for a thick packaging bag having a large thickness. It can be said that it is effective to provide a bottom gusset at the bottom of the bag when securing the self-supporting property of the packaging bag having a large capacity. In this case, if the capacity of the packaging bag is further increased, a double-type gusset having a larger width than the single-type gusset is better.

  Among the packaging bags, those having a double bottom gusset at the bottom of the bag in order to increase the capacity can secure a large capacity as intended. However, on the other hand, there is a tendency to lack stability in terms of independence. This is due to the three bottom ribs (front bottom rib, center bottom rib, and rear bottom rib) generated by providing a double bottom gusset structure at the bottom of the bag. Sitting worsens. Therefore, when technically establishing stable independence while increasing the capacity of a packaging bag, and achieving it with a double bottom gusset structure at the bottom of the bag, a plurality of bottom ribs are used as they are. Instead of leaving it alone, technically effective measures must be taken against these.

  In addition, if the useful and useful packaging bags with self-supporting gussets can be stably mass-produced at a high yield while suppressing initial costs and running costs, the contribution of such technology will be extremely large.

JP 2009-214907 A JP 2002-154554 A JP 2010-137864 A Japanese Utility Model Publication No. 58-037801 JP-A-10-119991 JP 2005-306382 A

The present invention has been made to solve such technical problems. Therefore, the present invention mainly has the following items <01> to <03>.
<01> To provide a highly self-supporting sachet with a large storage capacity by devising a clever gusset structure.
<02> The above packaging bag with a self-supporting gusset has a single side gusset structure on both sides of the bag and a double bottom gusset structure on the bag bottom, thereby simplifying and strengthening the structure. Satisfy both high quality and low cost.
<03> To provide a manufacturing method capable of reducing initial costs, running costs, high yield, and stable mass productivity for the above-mentioned packaging bags with self-supporting gussets.

The self-standing gusseted packaging bag and the manufacturing method thereof according to the present invention are characterized by the following problem solving means <11> to <14> in order to achieve the intended purpose.
<11> A front base member that forms a front surface of the bag and forms a sheet, a rear base member that forms a back of the bag and forms a sheet, and a bag A single-type side gusset for constituting both sides and foldable into the bag, and a double-type bottom gusset for constituting both sides of the bag and foldable into the bag Having, and
A front base member disposed on the front surface of the bag, a rear base member disposed on the back of the bag, side gussets disposed on both sides of the bag, and a bottom gusset disposed on the bottom of the bag are bonded together in a bag shape. And
Each side of the bag has two side ribs along the vertical direction as an adhesive part between the constituent materials, and three bottom ribs along the width direction as an adhesive part between the constituent materials also at the bag bottom. In packaging bags that are assumed to be
The three bottom ribs at the bottom of the bag are all of a non-self-supporting structure that can fall down, and the front bottom rib and the rear bottom rib, excluding the central bottom rib, are It also serves as a support flap for bag self-supporting that is bent outward from the lower end of the rear base member, and
The adhesive portion between both side gussets and the central bottom rib is cut into a concave shape to form a concave overlapping avoidance portion on both sides of the bag bottom portion, and
A packaging bag with a self-supporting gusset, characterized in that a bag bottom surface portion including a central bottom rib of a self-supporting structure that can be laid down and two support flaps are in contact with the bag mounting surface.
<12> A chuck having a pair of occluded female member and male member is mounted in the bag opening, and the female member and male member of the chuck face each other so that the bag opening The packaging bag with a self-supporting gusset as described in <11> above, wherein the bag is provided on the inner surface of the front base member and the inner surface of the rear base member so that they can be engaged with each other.
<13> In the method for producing a packaging bag with a self-supporting gusset described in any one of <11> to <12> above,
A pair of single-type side gussets are interposed between the front base member and the rear base member and corresponding to both sides of the base members, and the front base member and the rear base A single-type bottom between a member and a portion corresponding to the bottom of both base members, between a front base member and both side gussets, and between a rear base member and both side gussets. Interposing gussets respectively, and
Forming a single-type side gusset structure on both sides of the bag and forming a double-type bottom gusset structure at the bottom of the bag by bonding the corresponding parts of the above-mentioned constituent materials to each other by thermal bonding means; and ,
A method for manufacturing a packaging bag with a self-supporting gusset, characterized in that a concave overlapping avoiding portion is formed on both sides of the bottom surface of the bag by cutting the adhesive portion between both side gussets and the central bottom rib into a concave shape.
<14> In the method for producing a packaging bag with a self-supporting gusset described in any one of <11> to <12> above,
A pair of single-type side gussets are interposed between the front base member and the rear base member and corresponding to both sides of the base members, and the front base member and the rear base A double-type bottom gusset is interposed at a position between the members and corresponding to the bottoms of both base members, and the lower ends of both side gussets are interposed in the central folding portion of the double-type bottom gusset. ,and,
Forming a single-type side gusset structure on both sides of the bag and forming a double-type bottom gusset structure at the bottom of the bag; ,
A method for manufacturing a packaging bag with a self-supporting gusset, characterized in that a concave overlapping avoiding portion is formed on both sides of the bottom surface of the bag by cutting the adhesive portion between both side gussets and the central bottom rib into a concave shape.

Among the packaging bags with self-supporting gussets according to the present invention, those described in the problem solving means <14> to <15> (hereinafter referred to as the first invention in this paragraph) are the following <21> to <26> It has the following effects.
<21> The packaging bag according to the first aspect of the invention includes a single-type side gusset structure on both sides of the bag and a double-type bottom gusset structure on the bottom of the bag. However, the bottom of the bag in the packaging bag of the second invention does not have the left front, right front, left rear, and right rear corner bottom ribs, and each of the three bottom ribs has a non-independent structure that can be laid down. Above all, the bottom rib on the front side of the bag and the bottom rib on the rear side of the bag are the outwardly projecting shape structure that also serves as a support flap for the bag to stand on its own. The bag bottom portion and the two support flaps are in contact with the bag placement surface. Even in the packaging bag of this second invention, since both sides of the bag having the side gusset structure and the bottom of the bag having the bottom gusset structure perform the original gusset function and give the bag swelling, what is flat packaging? It will be different. That is, the packaging bag of the first invention has an increased volume as a packaging bag by the amount of gussets in each part, and can pack a larger amount of articles to be packaged.
<22> As described above, for a packaging bag having a double bottom gusset structure at the bottom of the bag, when the bag expands greatly in the front-rear direction, the outer bottom rib (front bottom rib, The bottoms of the rear bottom ribs and the inner bottom ribs (center bottom ribs) that do not have such a pulling force are in an uneven state with a difference in height, and can easily fall over. On the other hand, the packaging bag of the first invention in which the center bottom rib is a non-self-supporting structure that can fall down and the bag bottom surface portion including the center bottom rib is in contact with the bag placement surface (grounding or landing) is stable. Standing state. The packaging bag of the first invention is not limited to this, and the two support flaps projecting to the front side of the bag and the rear side of the bag are also in contact with the bag placement surface. When a forward tilting action occurs in an unexpected situation with respect to the packaging bag in a stable standing state, one support flap protruding to the front side of the bag works to prevent the forward tilting, When a backward tilting action is exerted on the packaging bag in an unexpected situation, the other support flap projecting to the rear side of the bag functions to prevent the subsequent tilting. This is because the packaging bag of the first invention exhibiting a stable standing state is supported by a material that is difficult to tilt forward or backward through two support flaps, so that a higher degree of self-supporting stability is achieved. It can be secured.
<23> In the case of the packaging bag of the first invention, there are two side ribs along the vertical direction on both sides of the bag, and three bottom ribs along the width direction at the bag bottom. Of these, it is each bottom rib that receives more compressive load due to the packaged items, but these bottom ribs are all in contact with the bag placement surface in a lying state (flat state). There is almost no development into a strength problem. Of course, also here, the high-strength central bottom rib in a lying state along the width direction of the bag (high-strength one in which several layers of members are bonded and integrated) is in contact with the bag placement surface when the bag bottom surface is in contact with the bag mounting surface. Since it also becomes a padding to the bag bottom surface part (those hitting the bag bottom center part along the width direction of the bag) and fits to this part, the bag bottom part is protected by this protection effect. Therefore, the packaging bag according to the first invention, which has no problem of strength and exhibits a protective effect, exhibits a suitable strength.
<24> Although each component in the packaging bag of the first invention is a base member or a gusset and is not special, by skillfully forming a gusset structure in the adhesive configuration of each component, self-supporting stability and The amount of packaged items is increased. In other words, this also eliminates the addition of special members and the complexity of the structure, and achieves both independence and high capacity, thus simplifying the configuration of the packaging bag that is useful and useful. Can do.
<25> The packaging bag according to the first aspect of the invention is an exceptional packaging bag because it does not require expensive parts or expensive and complicated processing in order to achieve both self-supporting stability and high capacity. Even if it exists, this can be provided cheaply.
<26> Many packaging bags with self-supporting gussets are provided for practical use, which contributes to a wide range of packaging fields. Accordingly, in the packaging bag of the first invention having the above-described effects, if the chuck is mounted in the bag opening, the packaging field can contribute more than ever.

As a method for producing a packaging bag with a self-supporting gusset according to the present invention, what is described in the problem solving means <13> (hereinafter referred to as the second invention in this paragraph) is the following <27> to <29> It has an effect.
<27> In the packaging bag manufacturing method of the second invention, a required member such as a gusset (gadget member) is interposed between the front base member and the rear base member, and the required parts are bonded by thermal bonding means. . In this case, the base member is in the form of a sheet as is well known, and the gusset member is also a known member folded into a single type. Therefore, in a line production system for mass production, it is only necessary to supply and arrange each gusset member in a predetermined order on the lower base member of both base members that merge vertically. It is. Such a technique is in a stable and mature region at present. Each member of the packaging bag is not special. This is a product that eliminates the high-difficulty production technology with a high incidence of defective products, that is, for a packaging with a useful and useful self-supporting gusset having the above-mentioned effects by means of a stable manufacturing method that can increase the rate of non-defective products. It is to manufacture bags. Therefore, when using the packaging bag manufacturing method of the second invention, the packaging bag with a self-supporting gusset can be stably mass-produced with a high yield.
<28> When a predetermined packaging bag is produced in a line in the packaging bag manufacturing method of the second invention, the respective members are supplied or joined by the supply means, and the essential parts thereof are thermally bonded means. It is only necessary to bond with or cut a predetermined portion with a cutting means. This does not require specially expensive equipment or large equipment that consumes a large amount of space, and can be implemented by changing a part of the line in the existing equipment. Therefore, when using the packaging bag manufacturing method of the second invention, the initial cost can be suppressed and the packaging bag with a self-supporting gusset can be economically manufactured. This also leads to a low cost provision of useful and useful self-supporting gusseted packaging bags.
<29> The packaging bag manufacturing method of the second invention is a method for manufacturing a predetermined packaging bag by effectively forming a line with a small number of work types such as material supply, adhesion at important points, and cutting at important points. This makes it possible to reduce the running cost because the packaging bag is manufactured in a lean process and a process with low energy consumption. Therefore, when using the packaging bag manufacturing method of the second invention, the running bag can be economically manufactured while suppressing the running cost. This also leads to an inexpensive provision of useful and useful self-supporting packaging bags with gussets.

  As a method for producing a self-supporting gusseted packaging bag according to the present invention, the problem-solving means <14> (hereinafter referred to as the third invention in this paragraph) is as described in <27> to <29> above. It has an effect. This is the method of the third invention using a single double-type bottom gusset, even when the method of the second invention uses a plurality of single-type bottom gussets when forming a double-type bottom gusset structure at the bottom of the bag. However, there is no substantial difference in the effects <27> to <29>. Therefore, it can be said that the packaging bag manufacturing method of the third invention also has the effects <27> to <29>.

It is the front view which showed 1st embodiment of the packaging bag with a self-supporting type gusset which concerns on this invention, the left view, the right view, and a bottom view. FIG. 2 is a left side view and a cross-sectional plan view of a bottom cutout of the packaging bag with a self-supporting gusset of FIG. 1. FIG. 3 is a left side perspective view and a right side perspective view of the self-standing gusseted packaging bag of FIG. 1. It is a disassembled perspective view regarding the packaging bag with a self-supporting gusset of FIG. It is the longitudinal cross-sectional view which showed schematically the comparison of the packaging bag with a self-supporting type gusset of FIG. 1, and its modification. It is the block diagram of the line which showed two embodiment schematically about the manufacturing method of the packaging bag with a self-supporting type gusset which concerns on this invention. It is the principal part perspective view and two cross-sectional arrow views which showed the manufacturing condition of the one embodiment about the manufacturing method of the packaging bag with a self-supporting gusset which concerns on this invention. The manufacturing method of the packaging bag with a self-supporting type gusset which concerns on this invention is the principal part perspective view which briefly showed the manufacture condition of other one Embodiment, and two cross-sectional arrow views. It is the principal part side view which showed 2nd embodiment of the packaging bag with a self-supporting type gusset which concerns on this invention, the principal part vertical front view, the principal part vertical side view, and a partial bottom view.

  The embodiments of the packaging bag with a self-supporting gusset according to the present invention and the manufacturing method thereof will be described below with reference to the accompanying drawings.

  1-4 and FIG. 5 (A) are related with 1st embodiment of the packaging bag 11 with a self-supporting type gusset which concerns on this invention. The self-supporting gusseted packaging bag 11 may be simply referred to as a packaging bag 11 in each embodiment described below.

  The packaging bag 11 illustrated in FIG. 1 to FIG. 4 and FIG. 5 (A) includes a pair of front and rear base members 12 and 13 and a pair of left and right single-type side gussets, as will be apparent from the details described later. 14 and 15 and one double type bottom gusset 16 are the main components (components). Of these, the base members 12 and 13 are made of a thin material called a film shape, a sheet shape, or a sheet film shape, and have a substantially quadrangular (including quadrangular) outer shape. Both the side gussets 14 and 15 and the bottom gusset 16 are also made of the same thin material as the base members 12 and 13. In addition, as will be apparent from the description below, the double-type bottom gusset 16 is a double-type by combining two bottom gussets 16F and 16R made of a single type.

  The packaging bag 11 having the base members 12 and 13, the side gussets 14 and 15, and the bottom gusset 16 as main components includes various materials. One example is a synthetic resin, and the other is a metal foil (metal film). Another example is paper. Other than these, a composite material composed of a combination of two or more selected from synthetic resin, metal foil, and paper can be used. For the synthetic resin packaging bag 11 corresponding to a typical example, the specific synthetic resin film in that case is linear low density polyethylene (LLDPE), high density polyethylene (HDPE), unstretched polypropylene (CPP). ), Polyamide (PA), polyester (PET), vapor-deposited film, polyvinyl chloride, and the like, and a laminated film in which these films are laminated together is the most popular for packaging bags. Specific examples of the metal foil in the metal foil packaging bag 11 include aluminum foil, copper foil, SUS foil (stainless steel foil), and iron foil. The specific paper in the paper packaging bag 11 is not limited to Japanese paper or Western paper, and in particular, wrapping paper such as unbleached wrapping paper, bleached wrapping paper, and synthetic paper can be used. A typical example is kraft paper. For composite materials, laminated products with synthetic resin film and paper, laminated products with synthetic resin film and metal foil, laminated products with metal foil and paper, laminated processing with synthetic resin film and paper and metal foil We can give goods.

  One of the other components of the packaging bag 11 illustrated in FIGS. 1 to 4 and FIG. 5A is a sealing material 17F for improving the airtightness on the bag opening side. One is a chuck 18 for freely closing and opening the bag opening. Whether or not the sealing material 17F and the chuck 18 are used is flexible. Therefore, in the case of the sealing material 17F and the chuck 18, it is provided in the packaging bag 11 as needed.

  The sealing material 17F is in the form of a tape that is long in the width direction of the bag. A specific example of the material of the sealing material 17F is a synthetic resin having thermal adhesiveness. Incidentally, when both the base members 12 and 13 are made of a synthetic resin, the same synthetic resin as that of the sealing member 17F or a synthetic resin different from that may be adopted. Sealing material 17F increases the adhesive strength at the upper end of both side gussets 14 and 15 and prevents peeling bag breakage (peeling breakage bag at the upper end side of both side gussets 14 and 15) when tensile stress is concentrated inside the bag. It is provided to do. The sealing material 17F is bonded to the inner surface of either one of the base members 12 and 13, but referring to FIG. 4, for example, when it is the rear base member 13, A part of the inner surface on the opening side of the rear base member 13 in FIG. 4 is set to the sealing material bonding portion 17R.

  As is well known, the chuck 18 is composed of a pair of freely engageable female members 19a and male members 19b. The pair of female members 19a and male members 19b are also made of synthetic resin in a typical example. Specifically, the synthetic resin that is the material of the chuck 18 is low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, polypropylene, and the like, and an appropriate resin is selected from these. The Incidentally, when the chuck 11 is required to be flexible, a resin such as polyethylene or ethylene copolymer is desirable. When the chuck 11 is difficult to stretch, homopolypropylene, block polypropylene, random polypropylene (RPP), propylene-ethylene-butene 1 random terpolymer, polyolefin special soft resin (eg, prime polymer) A thermoplastic resin such as TPO resin such as TPO) or a mixture of these resins is desirable. With respect to the chuck 18, in the case of the female member 19a, a concave female claw is formed on one side of the tape-like base material, and in the case of the male member 19b, the convex shape is provided on one side of the tape-like base material. Male claws are formed. Since the female claws of the female member 19a and the male claws of the male member 19b correspond to be freely engageable, it is possible to freely engage and disengage them. In addition to the chuck 18, a female member 19 a and a male member 19 b may be integrally formed on the inner surfaces of the base members 12 and 13.

  As already described, FIGS. 1 to 4 and FIG. 5 (A) show the packaging bag 11 of the first embodiment. When the relative positional relationship of each component in this packaging bag 11 is said, the front base member 12 is in the position which becomes a bag front part as is obvious, and the rear base member 13 is also obvious. Located at the back of the bag. A female member 19a and a male member 19b of the chuck 18 are provided on the upper side (the opening side of the bag) on the inner surfaces of the base members 12 and 13, respectively. As for the female member 19a and the male member 19b in this case, it is free as to which of the male and female members the front and rear base members 12 and 13 are provided. Therefore, the base member provided with the female member 19a and the male member 19b may be the reverse of the illustrated example. On the inner surface of the rear base member 13, a sealing material 17F is applied to a sealing material bonding portion 17R below the male member 19b, whereby an area including the upper ends of both side gussets 14 and 15 is hermetically sealed. .

  The double-type bottom gussets 16 are separated from each other as single-type bottom gussets 16F and 16R as shown in FIG. 4 until predetermined adhesion is completed. Each of the single-type bottom gussets 16F and 16R has a folding shape that can be folded inward of the bag. Each of the single-type bottom gussets 16F and 16R is formed with cut-out portions 16H for penetrating adhesion at both ends thereof. As shown in FIG. 4, one bottom gusset 16 </ b> F is located on the lower inner surface side of the front base member 12, and the other bottom gusset 16 </ b> R is located on the lower inner surface side of the rear base member 13. Is.

  Each of the left and right single-type side gussets 14 and 15 has a folding shape that can be folded into the bag. As is apparent from FIG. 4, the single-type side gussets 14 and 15 are located between the opposing inner surfaces of the base members 12 and 13 and located on both sides thereof, and the lower portions of the side gussets are Each is interposed between both single type bottom gussets 16F and 16R.

  Regarding the packaging bag 11 of the first embodiment and the packaging bags 11 of the second and subsequent embodiments, a heat bonding means (heat sealing means) or an adhesive bonding means is selectively used depending on the material of the constituent elements. Adopted and finished in a bag shape. In particular, when each component is of a synthetic resin type, a thermal bonding means is often employed. Incidentally, in the typical example of the packaging bag 11 of the first embodiment described below, since each component is a synthetic resin type, a thermal bonding means is employed for bonding the main part or all the members. . More specifically, the portion of the synthetic resin that constitutes the surface that participates in adhesion is made of a heat-adhesive material, and the portion of the synthetic resin that constitutes a surface that does not participate in adhesion is made of a non-thermo-adhesive material. These synthetic resins are integrated into a film or sheet.

  In the packaging bag 11 of the first embodiment, each component in each of the above-described parts constitutes the bag 11 by the respective predetermined portions being relatively bonded. That is, the front base member 12 disposed on the front surface of the bag, the rear base member 13 disposed on the back of the bag, the side gussets 14 and 15 disposed on both sides of the bag, and the bottom gusset 16F disposed on the bottom of the bag. -16R is bonded in a bag shape to constitute the packaging bag 11. In the case of the packaging bag 11 configured in this way, two side ribs (four in total) along the vertical direction exist as adhesive portions between the constituent materials on each side of the bag (left side and right side). The bottom part of the bag also has three bottom ribs along the width direction as an adhesive part between the constituent materials. 1 to 3, the four side ribs are denoted by reference numerals 31 to 34, and the three bottom ribs are denoted by reference numerals 35 to 37. In this case, the three bottom ribs 35 to 37, that is, the front bottom rib 35, the center bottom rib 36, and the rear bottom rib 37 each have a self-standing structure as shown in the drawing and constitute a part of the bag stand. In view of the fact that the three bottom ribs 35 to 37 are positioned on the outer side and the inner side, the two outer bottom ribs 35 and 37 can be referred to as outer ribs, and the inner one bottom rib 36 can be referred to as inner ribs. Regarding the bonding in this case, further, the single-type bottom gussets 16 </ b> F and 16 </ b> R are bonded to each other at the center bottom rib 36, thereby forming the double-type bottom gusset 16.

  About the packaging bag 11 of 1st embodiment, each component in said each part is adhere | attached also as follows, and the four corner bottom ribs 41-44 are formed. Among the lower left front corners on the lower bag side, which is the first of them, the lower left front corners include the lower left corners of the front base member 12, the lower front ends of the left side gussets 14 and the lower left front portions of the bottom gussets 16. Are formed by bonding and integrating the left front corner bottom rib 41. The lower right front corner on the lower bag side, which is the second of them, includes the lower right corner of the front base member 12, the lower end front of the right side gusset 15, and the right front end of the bottom gusset 16. The right front corner bottom rib 42 is formed by bonding and integrating. The left rear lower corner on the lower bag side, which is the third of them, includes the lower left corner of the rear base member 13, the lower end rear of the left side gusset 14, and the left rear end of the bottom gusset 16. The left rear corner bottom rib 43 is formed by bonding together. The right rear lower corner on the lower bag side, which is the fourth of them, includes the lower right corner of the rear base member 13, the lower end rear of the right side gusset 16, and the right rear end of the bottom gusset 16. The right rear corner bottom rib 44 is formed by adhering together. Each of the left front, right front, left rear, and right rear corner bottom ribs 41 to 44 thus formed also has a self-supporting structure. Each of the corner bottom ribs 41 to 44 constitutes the remaining portion of the bag stand and also serves as a resistance portion against the spread of the bottom gusset 16. The reason why each of the corner bottom ribs 41 to 44 becomes such a resistance portion is that it becomes thicker and harder than the other portions by the above-mentioned bonding and integration, thereby obtaining rigidity that is difficult to deform. . Therefore, when the bottom gusset 16 tries to spread, the bottom gusset spread is suppressed against this.

  Each of the side ribs 31 to 34, each of the bottom ribs 35 to 37, each of the corner bottom ribs 41 to 44, and the like are produced by adhering the respective components as described above. As a specific example at that time, as is apparent from FIGS. 1 and 3, a part of both base members 12, 13 (lower part of the side edges) and a part of both side gussets 14, 15 (below the side edges) Part) are directly bonded through the cut portions 16H of the bottom gussets 16F and 16R. In addition, triangular corner adhesion portions 45 are formed at the four corners of the lower portion of the bag. Since each of the four corner bonding portions 45 is continuous with the corresponding corner bottom ribs 41 to 44, it is included in a part of the continuous corner bottom ribs 41 to 44.

  1 to 4 illustrated as the first embodiment of the packaging bag 11 is long in the vertical direction (up and down direction), narrow in width (left and right direction), and small in thickness (front and rear direction). As an example, it is used for packaging of “tea leaves”. Of course, by changing the dimensions and specifications in this case, it can be applied to the packaging of “sprinkled food”, for example, and even other packaged items need to be self-supporting in a flat packaging state. If applicable, you can apply to them.

  In the packaging bag 11 of the first embodiment, S is 0.3 W to 1 W, where S is the single heel width of the single-type side gussets 14 and 15 and W is the double heel width of the double-type bottom gusset 16. In particular, it is desirable that S is in the range of 0.5 W to 0.8 W. The reason is that flat packaging can be maintained when S and W are in such a numerical range relationship.

  In the packaging bag 11 of the first embodiment, the single collar width of the single-type side gussets 14 and 15 is S, and the widths of the front base member 12 and the rear base member 13 are H, respectively. When the height of the rear base member 13 is T, it is preferable that H is in the range of 1S to 7S and T is in the range of 0.5H to 4H. As long as the bag length (T) and the bag width (H) are in such a range based on the bag width S, flat packaging can be maintained in the packaging bags 11 of various sizes.

  In the above description, the heel width S indicates the effective heel width of the side gussets 14 and 15, and the heel width W also indicates the effective heel width of the bottom gusset 16. Furthermore, the effective heel width refers to the heel width when each heel spreads to the maximum extent.

  In the packaging bag 11 of the first embodiment, the double bottom gusset structure at the bottom of the bag is such a double type by joining two single type bottom gussets 16F and 16R. For this type, there is a modification as shown in FIG. 5A and 5B, FIG. 5A shows the first embodiment described above, and FIG. 5B shows a modification thereof.

  Referring to FIG. 5B, the bottom gusset 16 of this illustrated example is a double type alone. This double type bottom gusset 16 is also bonded to both base members 12 and 13 and both side gussets 14 and 15 in accordance with the above-described embodiment. There is no adhesion between the bottom gussets as in the case. Although there is such a difference between the two packaging bags 11 in FIGS. 5A and 5B, there is no substantial difference between the two in terms of the self-supporting flat packaging.

  The packaging bag 11 shown in FIGS. 1 to 5A is manufactured by the manufacturing method shown in FIGS. 6A and 7 as an example. As is well known, base member rolls are respectively set in the supply portion of the front base member 12 and the supply portion of the rear base member 13 installed on the production line. From these two supply parts, the front base member 12 and the rear base member 13 in a continuous state are rewound and supplied in a predetermined direction so as to meet each other so as to overlap each other at a predetermined position. On the other hand, from the supply section of each component, required materials (side gussets 14, 15, bottom gussets 16F, 16R, and sealing materials 17F) are supplied from predetermined positions on the production line in a timely manner. On the other hand, the required processing is performed. FIG. 6A shows the main part of the manufacturing line at that time, and FIG. 7 shows the main part of the manufacturing state at that time. As is apparent with reference to these drawings, the following are supplied and arranged on the upper surface (inner surface in the bag state) of the continuous rear base member 13 as described below. The first of them is a material for the bottom gusset 16R in a continuous state (long material of the bottom gusset 16R). The long bottom gusset 16R is supplied and arranged on one side edge of the continuous rear base member 13 as shown in FIG. The second is an integrated material of both side gussets 14 and 15. This side gusset integrated material is obtained by flattening a rectangular sheet material in a cylindrical shape. This side gusset integrated material can be divided into two side gussets 14 and 15 by equally dividing at the center line. Such a side gusset integrated material is supplied and arranged on the rear base member 13 from a direction orthogonal to the direction of travel of the continuous rear base member 13 (main production line). At this time, one end of the side gusset integrated material is placed on the material of the long bottom gusset 16R as shown in FIG. The third is the material for the bottom gusset 16F in a continuous state (the long material of the bottom gusset 16F) as described above. As shown in FIG. 7, the long bottom gusset 16 </ b> F is also supplied and arranged on one side edge of the continuous rear base member 13 and overlaps with one end portion of the side gusset integrated material. Thus, one end of the side gusset integrated material is sandwiched from above and below by the two long bottom gussets 16R and 16F. The fourth is a material for the sealing material 17F in a continuous state (long material of the sealing material 17F). As shown in FIG. 7, the long sealing material 17 </ b> F is supplied and disposed on the other side edge of the continuous rear base member 13. Therefore, the long sealing material 17F overlaps the other end portion of the side gusset integrated material. With reference to FIG. 6A and FIG. 7, when the respective materials merge to this state, the sealing process of the long sealing material 17 </ b> F shown in FIG. 6A is performed. This sealing process is a parallel sealing process along the main production line, that is, parallel to the main production line. In this parallel seal process, a parallel seal bar having an elongated shape along the main production line is used. More specifically, the parallel seal bar heated to a predetermined temperature is pressed from above the long seal material 17F, whereby the continuous rear base member 13, the other end of the side gusset integrated material, and the long seal material 17F. Are integrated by heating and pressing. Immediately after this, the bonded portion is cooled as shown in FIG. In this cooling process, as in the case of the parallel seal bar, a parallel cooling bar having an elongated shape is used along the main production line, and the parallel cooling bar is pressed against the above-mentioned bonding portion. Is cooled to a predetermined temperature. Referring to FIG. 6A, thereafter, the continuous front base member 12 coming via the roller RX meets the continuous rear base member 13 in a face-to-face relationship. That is, the continuous front base member 12 overlaps the continuous rear base member 13 after the required components have been distributed so as to cover the upper surface thereof. After passing through this stage, the orthogonal seal process and the orthogonal cooling process shown in FIG. 7 are performed. As for the orthogonal seal process, an orthogonal seal bar having an elongated shape in a direction orthogonal to the main production line is used. This orthogonal seal bar is located behind the roller RX and descends toward the upper surface of the line or returns upward. 6A, the orthogonal seal bar is moved from above the continuous front base member 12 in synchronism with the progress of the side gazette integrated material (at the center line thereof) below the orthogonal seal bar. Pressed (where the side gazette integrated material is located). As a result, the continuous rear base member 13, the side gusset integrated material, the long sealing material 17 </ b> F, and the continuous front base member 12 are bonded together by heating and pressing. At this time, the continuous rear base member 13 and the continuous front base member 12 are brought into an adhesive state through the cut portion 16H described above. In the orthogonal cooling process after the orthogonal seal process, as in the case of the orthogonal seal bar, an orthogonal cooling bar having an elongated shape in a direction orthogonal to the main production line is used, and the orthogonal cooling bar is pressed against the adhesive portion. Thus, the bonded portion is cooled to a predetermined temperature. In the following, the cutting process and the trimming process shown in FIG. In the cutting process, a cutter that is elongated in a direction orthogonal to the main production line and that descends and returns to the upper surface of the line is used. Cutting is performed with the center line as the cutting point. Thus, the packaging bag 11 for each bag is obtained. In the subsequent trimming process, trimming is performed to remove unnecessary portions and to adjust the bag shape.

  The manufacturing method of FIG. 6 (A) and FIG. 7 described above is an example when manufacturing the packaging bag 11 of FIGS. 1 to 5 (A). A packaging bag 11 of 5 (B) can also be manufactured. The example which manufactures the packaging bag 11 of FIG. 5 (B) is demonstrated only with respect to the principal point with reference to FIG. 6 (B) and FIG.

  In the case of manufacturing the packaging bag 11 of FIG. 5B, the bottom gusset material used at this time is not a single type but a long material for the double type bottom gusset 16. This is the only major difference when manufacturing each packaging bag 11 of FIGS. 5 (A) and 5 (B). Hereinafter, a manufacturing example of the packaging bag 11 shown in FIG. 5B will be described with reference to FIG. 6B and FIG.

  As apparent from FIG. 6B and FIG. 8 with particular reference to FIG. 8, a double long bottom gusset 16 is supplied and arranged on one side edge of the rear base member 13 that is continuously supplied. . Thereafter, the integrated material of the side gussets 14 and 15 is supplied and arranged on the rear base member 13 from a direction orthogonal to the traveling direction (main production line) of the continuous rear base member 13. At that time, one end portion of the side gusset integrated material enters the central folding portion of the double-type long bottom gusset 16 as shown in FIG. In this case, as shown in FIG. 8, an end portion 16H for penetrating adhesion of the long bottom gusset 16 is provided at one end of each side gusset integrated material that enters the central folding portion of the long bottom gusset 16. A hole-shaped cut portion 16W is formed that matches the above. This cut portion 16W is also used for penetration adhesion. Thereafter, as in the case of the previous manufacturing example, the long sealing material 17F is supplied and disposed on the other side edge of the continuous rear base member 13, and is heat-sealed in the same manner as in the previous manufacturing example. Subsequent processes are substantially the same as in the case of the previous manufacturing example, whereby the packaging bag 11 shown in FIG. 5B is manufactured. Therefore, about the manufacture regarding each packaging bag 11 of FIG.5 (B), the process after this is abbreviate | omitting the description by referring the content of the previous manufacture example.

  The packaging bag 11 of the second embodiment illustrated in FIG. 9 is different from the previous ones in that each of the three bottom ribs 35 to 37 on the bottom of the bag has a non-independent structure that can be laid down. This means that the corner bottom ribs 41 to 44 having a self-standing structure as described above do not exist. In the packaging bag 11 of FIG. 9, a front bottom rib (front bottom rib) 35 and a rear bottom rib (rear bottom rib) 37 are respectively provided at the lower end of the front base member 12 and the lower end of the rear base member 13. It also serves as a support flap for self-supporting bags that are bent outward from the bag. Therefore, in the following, the front bottom rib 35 and the rear bottom rib 37 in the packaging bag 11 of the second embodiment may be referred to as a support flap. In the packaging bag 11 of FIG. 9, the center bottom rib (center bottom rib) 36 having a non-self-supporting structure is applied to the bag bottom surface portion 21 as a flap having a protective effect.

  In the packaging bag 11 of FIG. 9, the double bottom gusset 16 or the single bottom gussets 16F and 16R does not have the above-described cut portion 16H. Since there is no cut portion 16H, part of both side gussets 14 and 15 are not directly bonded. Accordingly, both side portions of the three bottom ribs 35 to 37 are separated from each other. Furthermore, in the packaging bag 11 of FIG. 9, the adhesive part between the side gussets 14 and 15 and the bottom rib 16 is partially concave (V-shaped or U-shaped) by partial trimming as shown in FIG. Etc.). Here, this is referred to as an overlap avoiding unit 51. The overlap avoiding portion 51 is based on technical considerations for minimizing unnecessary flap overlap when the bottom ribs 35 to 37 are in a lying state, and for facilitating the falling of the center bottom rib 36. is there.

  Other matters in the packaging bag 11 of the second embodiment are substantially the same as or similar to the contents described in the packaging bag 11 of the first embodiment. Therefore, description of other matters in the packaging bag 11 of the second embodiment will be omitted by referring to the contents described in the packaging bag 11 of the first embodiment.

  The packaging bag 11 of the second embodiment illustrated in FIG. 9 is also a full packaging type in which both side gussets 14 and 15 and the double-type bottom gusset 16 are well spread, and therefore the amount of packages to be packaged is high. In addition, the bag bottom surface portion 20 including the center bottom rib 36 having a free-standing and non-independent structure is firmly grounded with respect to the bag placement surface, and the front bottom rib 35 and the rear bottom rib 37 project from the front and rear of the bag and are grounded. Therefore, the independence stability becomes higher. Further, the center bottom rib 36 applied to the bag bottom surface portion 20 protects the bag bottom surface portion 20 by the same protection effect as in the previous example.

  In addition, the packaging bag 11 of the second embodiment may be vertically long or horizontally long within the scope of the design change. The packaging bag 11 of the second embodiment can also be manufactured by the manufacturing method of the present invention mainly based on the above-described contents.

  The packaging bag with self-supporting gusset according to the present invention has high self-supporting stability in the full-packaging type, and also satisfies the succinctness, strength, and low price of the structure, so that it can be used industrially. It can be said that the nature is high.

  The method for manufacturing a packaging bag with a self-supporting gusset according to the present invention can reduce initial cost, control running cost, high yield, and stable mass productivity with respect to manufacturing the packaging bag. The contribution of is high.

11 Packaging Bags 12 Front Base Member 13 Rear Base Member 14 Side Gazette 15 Side Gazette 16 Bottom Gazette (Double Type)
16F Bottom gusset (single type)
16R Bottom gusset (single type)
16H excision part 16W excision part 17F sealing material 18 chuck 19a female member 19b male member 20 bag bottom part 31 side rib 32 side rib 33 side rib 34 side rib 35 bottom rib (front bottom rib)
36 Bottom rib (Center bottom rib, Center bottom rib)
37 Rear Bottom Rib 41 Corner Bottom Rib 42 Corner Bottom Rib 43 Corner Bottom Rib 44 Corner Bottom Rib 45 Corner Bonding Part 51 Overlap Avoidance Part

Claims (4)

A front base member that forms a sheet and forms a sheet, a rear base member that forms a sheet and forms a sheet, and both sides of the bag A single-type side gusset that can be folded inward of the bag and a double-type bottom gusset that can be folded inward of the bag. And
A front base member disposed on the front surface of the bag, a rear base member disposed on the back of the bag, side gussets disposed on both sides of the bag, and a bottom gusset disposed on the bottom of the bag are bonded together in a bag shape. And
Each side of the bag has two side ribs along the vertical direction as an adhesive part between the constituent materials, and three bottom ribs along the width direction as an adhesive part between the constituent materials also at the bag bottom. In packaging bags that assume that
The three bottom ribs at the bottom of the bag are all free-standing, and the front bottom rib and the rear bottom rib excluding the center bottom rib are the bottom and rear of the front base member, respectively. Serving as a support flap for bag self-supporting which is bent outward from the lower end of the base member, and
The adhesive portion between both side gussets and the central bottom rib is cut into a concave shape to form a concave overlapping avoidance portion on both sides of the bag bottom portion, and
A packaging bag with a self-supporting gusset, characterized in that a bag bottom surface portion including a central bottom rib of a self-supporting structure that can be laid down and two support flaps are in contact with the bag mounting surface.   A chuck having a pair of occluded female and male members is mounted in the bag opening, and the female and male members of the chuck face each other so that the front on the bag opening side. The packaging bag with a self-supporting gusset according to claim 1, which is provided so as to be engageable with the inner surface of the base member and the inner surface of the rear base member. In the method for manufacturing the packaging bag with a self-supporting gusset according to claim 1,
A pair of single-type side gussets are interposed between the front base member and the rear base member and corresponding to both sides of the base members, and the front base member and the rear base A single-type bottom between a member and a portion corresponding to the bottom of both base members, between a front base member and both side gussets, and between a rear base member and both side gussets. Interposing gussets respectively, and
Forming a single-type side gusset structure on both sides of the bag and forming a double-type bottom gusset structure at the bottom of the bag; ,
A method for manufacturing a packaging bag with a self-supporting gusset, characterized in that a concave overlapping avoiding portion is formed on both sides of the bottom surface of the bag by cutting the adhesive portion between both side gussets and the central bottom rib into a concave shape. In the method for manufacturing the packaging bag with a self-supporting gusset according to claim 1,
A pair of single-type side gussets are interposed between the front base member and the rear base member and corresponding to both sides of the base members, and the front base member and the rear base A double-type bottom gusset is interposed at a position between the members and corresponding to the bottoms of both base members, and the lower ends of both side gussets are interposed in the central folding portion of the double-type bottom gusset. ,and,
Forming a single-type side gusset structure on both sides of the bag and forming a double-type bottom gusset structure at the bottom of the bag; ,
A method for manufacturing a packaging bag with a self-supporting gusset, characterized in that a concave overlapping avoiding portion is formed on both sides of the bottom surface of the bag by cutting the adhesive portion between both side gussets and the central bottom rib into a concave shape.

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