JP2002293337A - Bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag for tightly packaging contents having fluidity such as drinkables wherein after the bag is unsealed, even if one drinks the contents directly from the opening of the bag or transfers the contents to another container, the external surface of the bag can be prevented from being contaminated, and hence the bag can be sanitarily used. SOLUTION: The bag 100 can take a three-way sealed form, four-way sealed form or a self-supporting form, and the upper parts of a front and rear wall surface films are folded outwards in a downward direction at a first folded back part 2 to provide a proper folded back surface of proper length, and then folded back again outwards in an upward direction at a second folded back part 3. The upper parts of the films are extended to a location higher than the part 2 to form an inner wall 4 inside the upper part of the bag, while an unsealing means (notch 10 and weakening line 9) is provided at a location lower than the part 2. Further, notches 5, 5 are provided at the left and right corners of the inner wall 4, and the inner sides thereof are sealed by heat-sealed parts 6, 6 so that the unsealing means passes across the parts 5, 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag for hermetically packaging a liquid content such as a liquid material or a granular material, and more particularly to a bag for sealing the inside of the bag. The present invention relates to a bag provided such that an inner wall formed by folding a film of the bag at the upper end when opened is protruded upward on both front and rear sides of the bag.

[0002]

2. Description of the Related Art Conventionally, as a bag for hermetically packaging a fluid content such as a liquid material or a granular material, there are, for example, a three-side seal type, a four-side seal type bag, and a self-standing bag type bag such as a standing pouch. There is. Such a bag is usually formed by removing a part of the bag such as an upper side or a corner portion when removing the contents, providing an opening, and pouring out from the opening, or removing the bag by narrowing a part of the bag. A width spout is provided in advance, the tip is cut out and opened,
For example, a method of pouring from the outlet is adopted.

[0003]

However, such a bag is, for example, a liquid or viscous liquid beverage having a relatively small capacity and having a mouth directly attached to the mouth. When used, the outside of the opening is generally contaminated, such as the attachment of various germs, and there is a problem of lack of hygiene. In addition, when a part of the bag is cut out to form an opening, the opening end is a cut surface of the bag and is often thin and sharp, and there is also a problem that directly applying a mouth may damage the lips and tongue. . Furthermore, even if the contents are medicines and the like, and the contents are transferred to another container and used, if the outer periphery of the opening of the bag is contaminated, there is a high possibility of contamination by foreign substances such as germs, which is a major hygiene problem. Becomes

The present invention has been made in order to solve such problems, and an object of the present invention is to allow a content such as a beverage filled in a bag to be directly introduced into an opening of the bag. There is no problem with hygiene even when used with drinking, and there is no sharp section at the open end of the bag, so it can be safely drunk. Even if you transfer it to another container and use it,
It is an object of the present invention to provide a bag which can be used hygienically without risk of contamination at the periphery of the opening of the bag.

[0005]

The above objects can be attained by the present invention described below. That is, according to the first aspect of the present invention, in a bag formed by heat-sealing the peripheral edges of two front and rear wall films in a bag shape, the upper portions of the front and rear wall films of the bag are first folded back. After being folded back outward at the portion and providing a folded surface of an appropriate length, it is again folded outwardly upward at the second folded portion so that the upper end of the wall film is higher than the first folded portion. The bag is provided with an inner wall having the first folded portion as an upper end by the first folded portion and the second folded portion, and the bag is opened by the second folded portion. A lower portion of the wall film extending outwardly and upwardly from the portion, the upper portion of the inner wall protruding upward when the bag is opened by the opening means. Consisting of a bag.

As the opening means, in addition to an opening instruction line and an opening instruction mark such as a cut line displayed by printing, etc., an easy-opening means for facilitating an opening operation by tearing or the like as described below is used. it can. These opening means may be used alone, particularly when the easy-opening means is used, but it is more preferable to use a plurality of them appropriately in combination.

[0007] As the means for easy opening, (a) a method of providing a notch which is frequently used even in a normal bag, and (b) providing a weakened line such as a perforated line in a part of the laminated film of the bag, such as the base material layer. Method, (c) a method of providing a half-cut line by laser light irradiation, etc., (d) a method of forming a long and small scar group at the end of the bag by a mechanical method (from the scar group as a starting point, Is possible),
(E) In order to easily open the bag in a certain direction, an easily tearable film, for example, a uniaxially stretched film is applied to an intermediate layer of a laminated film of a bag so that the stretching direction matches the tearing direction when the bag is opened. There is a method of laminating and using this laminated film for a bag, and the like, and can be appropriately selected or used in combination.

[0008] Although notches of one-letter or V-shape are often used as the above-mentioned notches, the shape thereof is not limited, and any shape may be used as long as it has a pointed portion in the tearing direction. The half-cut line is not limited to a continuous linear half-cut line, but may be an intermittent half-cut line such as a perforated line. Such a half-cut line may be a single line, but assuming that the tearing direction is shifted, a plurality of half-cut lines such as one line or two lines on each side of the center half-cut line are formed in parallel. Alternatively, it can be provided in a shape converging with the center half-cut line.

[0009] By adopting the above configuration, when taking out the contents filled in the bag, the bag can be easily opened by the opening means provided on the upper portion of the bag. And
By opening the bag, the upper portion of the inner wall having the first folded portion as the upper end projects above the opened end of the outer wall film. Therefore, even when the contents are drinks and the like, and the mouth is directly attached to the opening of the bag for drinking, since the portion in contact with the mouth is the inner wall of the bag and the upper end is the folded portion, contamination from the outside is prevented. At the same time, it is hygienic, and at the same time, the mouth is soft and the thin and sharp opening end does not come into contact with the mouth, so that it can be safely drunk. Further, even when the contents are transferred to another container as a medicine or the like and used, the contents can be used hygienically without touching the outer surface around the opening end of the bag.

According to a second aspect of the present invention, a notch is provided at an upper corner on both left and right sides of an inner wall having an upper end at a first folded portion provided inside the front and rear wall surfaces of the bag. The inner peripheral edge of the cutout portion is sealed by heat sealing, and the opening means of the bag is provided so as to cross the cutout portions on both right and left sides. Consists of bags.

By adopting such a configuration, in addition to the operation and effect of the invention described in the first aspect, the opening means of the bag is moved to a position below the first folded portion in a horizontal straight line. Even if it is provided in a shape, when opening the bag, it is possible to easily tear open only the outer wall film without tearing the inner wall. Further, by making the opening means straight in the lateral direction, the processing is facilitated, and the opening operation can be performed more easily.

According to a third aspect of the present invention, the bottom portion of the bag is formed in a form having a gusset portion formed by folding a bottom film inward and inserting the bottom film between lower portions of front and rear wall films. The bag according to claim 1 or 2, wherein the bag is heat-sealed with a seal pattern in which the inside is concave from both sides to the center, and is formed in a self-supporting form.

[0013] A typical example of a seal pattern in which the inside of the gusset at the bottom of the bag heat-sealed is concave from both sides to the center is a shape in which the inside rises in a curved line from the center of the bottom to both sides. A bottom shape or a bottom shape seal pattern in which both sides rise straight from the bottom with a constant width and length outwardly, but are not limited thereto, for example, a V-shape whose inside is open at an obtuse angle. Or, any seal pattern such as a U-shaped seal pattern may be used as long as the inside has a concave shape from both sides to the center.

By adopting such a configuration, in addition to the function and effect of the invention described in claim 1 or 2, the bag is provided with independence, so that the bag is easy to handle.
The appearance, display effect, and the like can be excellent.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention, such as a film used for manufacturing a bag of the present invention and a method for manufacturing a bag, will be described. As described above, the bag of the present invention needs to provide the first and second folded portions on the upper part of the front and rear two wall films, and to seal the left and right edges by heat sealing. The wall surface film needs to have heat sealability on both sides. Therefore, for example, a single film having heat sealing properties or a laminated film in which a sealant layer is provided on both surfaces of a base material layer can be used.

However, in terms of bag strength and ease of bag making, it is preferable to use a laminated film having a structure in which a sealant layer is provided on both surfaces of a base material layer, rather than a single film.
The base material layer basically preferably has mechanical strength, rigidity, heat resistance and the like as a support, and further, it is necessary to have gas barrier properties in order to enhance the storage stability of the contents. There is also. Therefore, the base material layer itself may be formed as a single layer, or may be formed as a composite layer in which a plurality of materials are stacked.

Materials that can be suitably used for the substrate layer include, for example, paper such as high-quality paper and kraft paper, or paper having enhanced water resistance, and a stretched film such as polyester, polyamide (various nylons), and polypropylene. In addition, a composite material obtained by laminating an aluminum foil, a plastic film on which a metal such as aluminum or an inorganic oxide such as silica or alumina is vapor-deposited, a saponified ethylene-vinyl acetate copolymer film, etc. A film can be used.

Representative examples of the structure of the laminated film which can be preferably used as the wall film of the bag include the following structures. (1) L-LDPE layer (sealant layer) / paper / L-LDP
E layer (sealant layer) (2) L / LDPE layer (sealant layer) / paper / adhesive / aluminum foil / adhesive / L / LDPE film (sealant layer) (3) L / LDPE film (sealant layer) / adhesion Agent /
PET film / adhesive / L / LDPE film (sealant layer) (4) L / LDPE film (sealant layer) / adhesive /
PET film / adhesive / aluminum foil / adhesive / L
・ LDPE film (sealant layer) (5) L ・ LDPE film (sealant layer) / adhesive /
PET film / adhesive / EVOH film / adhesive /
L-LDPE film (sealant layer) (6) L-LDPE film (sealant layer) / adhesive /
ON film / adhesive / L-LDPE film (sealant layer) (7) L-LDPE film (sealant layer) / adhesive /
ON film / adhesive / aluminum foil / adhesive / L ・
LDPE film (sealant layer) (8) L / LDPE film (sealant layer) / adhesive /
ON film (silica or alumina or aluminum vapor-deposited layer) / adhesive // L·LDPE film (sealant layer), etc. .

When the bag is formed in a self-standing bag type such as a standing pouch, a bottom film is required.
Alternatively, a laminated film having a configuration in which the outer sealant layer is removed from the configuration of the wall film can be used. Furthermore,
In the case of the bottom film, the rigidity is not so required, so that the thickness can be reduced to obtain a cost advantage.

In the construction of the laminated film, PE
T film is biaxially oriented polyethylene terephthalate film, ON film is biaxially oriented nylon film,
LDPE refers to linear low-density polyethylene, and EVOH film refers to saponified ethylene-vinyl acetate copolymer film. Since the adhesive between the layers is usually laminated by a dry lamination method, an adhesive for dry lamination such as a two-component curable polyurethane-based adhesive can be used.

When paper is used for the base material layer, L·L
Since a sealant layer such as DPE can be satisfactorily laminated without an adhesive by an extrusion coating method, in this case, it is simply described as an L-LDPE layer. However, the surface of the paper may be subjected to a known easy-adhesion treatment such as a flame treatment (a treatment also serving as fluffing) or a corona discharge treatment to further improve the adhesion.

As the sealant layer, only L-LDPE is exemplified. However, L-LDPE has excellent heat sealing stability and also has excellent content resistance, such as stress cracking resistance to a surfactant. Particularly suitable for packaging beverages and other liquids. In addition to the high-pressure low-density polyethylene, polypropylene, ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic acid Acrylic ester copolymers, ionomers, polyester resins and the like can also be appropriately selected and used.

In particular, the ethylene / α-olefin copolymer obtained by polymerization using a single-site catalyst such as a metallocene catalyst has a narrow molecular weight distribution and a stable copolymerization ratio, so that the low-temperature heat sealability and In the sealant layer of a bag having an excellent hot sealing property and a step due to a difference in film overlap in the heat seal portion as in the bag of the present invention, it is possible to prevent the occurrence of pinholes due to missing seals. Are suitable. Furthermore, by using a blend of the copolymer and an olefin elastomer, the heat fluidity of the sealant layer is improved, and the generation of pinholes due to the steps can be more effectively prevented.

Next, a method of manufacturing a bag of the present invention using the above-described laminated film will be described. The bag of the present invention is characterized in that the inner wall is formed on the upper portion of the bag by a method in which the wall film on both sides of the upper portion of the bag is folded twice, and the type of the main body of the bag is not particularly limited. For example, in addition to a three-sided seal type or a four-sided seal type bag, a self-standing bag type such as a standing pouch can be used.

As a bag making machine for manufacturing such bags, a machine capable of forming bags in a side-by-side manner is suitable, and it is preferable to use a bag making machine for a standing pouch having many processing sections. In particular, a three-sided seal type, a four-sided seal type bag and a standing pouch (self-standing bag) are also used, and the first and second folded portions provided on top of the front and rear wall films are added thereto. It can be easily manufactured by additionally providing a necessary processing device such as a processing device, a punching device having a cut-out portion in a folded portion thereof, and a heat sealing device around the cut-out portion.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below more specifically with reference to the drawings. However, the present invention is not limited to these drawings. Further, the same reference numerals are used for the parts having the same names in different drawings. Figure 1
Is a front view showing the configuration of an embodiment of the bag of the present invention,
FIG. 2 is a perspective view illustrating the folded shape of the front and rear wall films at the top of the bag shown in FIG. FIG. 3 is a front view showing the configuration of another embodiment of the bag of the present invention.

The bag 100 shown in FIG. 1 has a bottom portion and a body portion formed by the lower portions of the front and rear wall films 1, 1 'and the edge portions on both sides in the same manner as in a normal four-side seal type bag. It is formed by heat sealing with a bottom seal portion 7 and side seal portions 8 and 8 having a predetermined width, and the upper portion of the bag is temporarily connected to the upper portions of the front and rear wall films 1 and 1 ′ by the first folded portion 2. 2 (see FIG. 2) to provide a folded surface of an appropriate length by folding back outward, and then again folding upward at second folding portions 3, 3 to form upper end portions of wall films 1, 1 '. But the first
1 (to the position of the upper seal portion 11 in FIG. 1), and inside the front and rear of the bag 100, the first folded portions 2, 2 and the second folded portion The folded portions 3 and 3 form inner walls 4 and 4 (only one side is shown) having the first folded portions 2 and 2 as upper ends, and cutouts are formed in upper corners on both left and right sides of the front and rear inner walls 4 and 4. 5,
5 are provided, and the inner peripheral edges of the cutout portions 5, 5 are heat-sealed and sealed with heat seal portions 6, 6, and the left and right side edges above the second folded portions 3, 3 are , Heat-sealed at the upper part of the body seal portions 8, 8, and further, as means for opening the bag, a notch 10,
10 is provided so as to cross the cutouts 5 on both right and left sides.

When the laminating film is used for the wall film 1, 1 ', the weakening line 9 may be an intermittent cut line such as a perforated line provided in the base material layer, or a laser beam irradiation. May be a half cut line. still,
The upper seal portion 11 is an unsealed opening before filling the contents, and heat-seales after filling the contents from this portion.

By adopting such a configuration, the bag 10
When taking out the contents filled in 0, using the opening means provided at the upper part of the bag, that is, the notch 10 and the weakening line 9, the upper part of the bag is easily torn along the weakening line 9 and opened. can do. The opened bag 100 can be configured such that the inner wall 4 having the first folded portion 2 as the upper end protrudes above the opened end by the weakening line 9 at the upper part. Therefore, even if the contents are filled with, for example, a liquid or viscous liquid beverage, and the mouth is opened and the mouth of the opened bag is used for drinking, the portion that comes into contact with the mouth is the inner wall 4. The inner wall 4 is sanitary without being contaminated from the outside, and the upper end of the inner wall 4 is the folded portion 2 so that it is not sharp and the mouth feels soft and does not hurt the lips or tongue, and the contents are not damaged. Can be safely drunk. In addition, even if the contents are liquid drugs or other medicines and they are transferred to another container and used,
There is no risk of contamination at the periphery of the opening of the bag, and the bag can be used hygienically.

The bag 200 shown in FIG. 3 is different from the structure of the bag 100 shown in FIG. 1 in that only the bottom portion of the bag is changed to a form in which the bag 200 can be provided with independence. The body and upper part of the bag 200 are the bag 1 shown in FIG.
It is formed and configured in the same manner as 00. That is, bag 2
00 has a gusset portion 13 formed by folding the bottom film inward between the lower portions of the wall films 1 and 1 'on both sides and inserting the bottom film folding portion 12 to form the gusset portion 13. The seal pattern is formed such that the inner side is concave from both sides to the central part, in this case, the bottom seal portions 7, 7 'of the seal pattern which is concave in a V-shape opened at an obtuse angle are heat-sealed.

However, it is necessary to employ a different method for the heat sealing of the bottom part according to the structure of the bottom film. For example, the bottom film is provided with sealant layers on both sides of the same base material layer as the wall films 1, 1 '. When the bottom film having the provided structure is used, a method of separately heat-sealing the front and rear pleats of the gusset portion 13 with the bottom seal portion 7 and then heat-sealing the bottom seal portions 7 'on both sides together. Thus, heat sealing of the bottom seal portions 7, 7 'can be performed.

When a bottom film having a structure in which a sealant layer is provided on only one side of the base material layer is used, when the bottom film is folded inside and inserted,
By folding and inserting the sealant layer so as to face outward, heat sealing of the bottom seal portions 7, 7 'can be performed simultaneously and collectively. However, in this case, although not shown in the drawing, it is preferable to insert a notch in the vicinity of the lower end on both sides of the bottom film to be folded and inserted, and heat-seal it. Since the portion is heat-sealed at the notch portion and does not open back and forth, a ring-shaped leg is formed by the heat-sealing portion on the outer periphery of the bottom portion of the bag, and excellent self-sustainability can be imparted.

As described above, by configuring the bag 200 as shown in FIG. 3, in addition to the operation and effect described for the bag 100 shown in FIG. 1, excellent self-sustainability is imparted to the bag 200. Therefore, the handling of the bag is facilitated, and the appearance and the display effect can be excellent. Further, as shown in the figure, the seal pattern of the bottom seal portion 7 is a V-shaped concave shape in which the inside is opened at an obtuse angle, so that the bag 200 filled with the contents is formed.
Has a rhombus-shaped cross section at the bottom and spreads back and forth, and the wall film is bent so as to form a ridge line upward from the V-shaped apex. Therefore, when the bag 200 is opened, the opening at the top of the bag, that is, the inner wall 4 is also easily bent at the central portion, and the width of discharging the contents is narrowed.
When drinking the contents with the mouth attached to this part, it becomes easier to drink. This point is the same when the contents are transferred to another container, and the contents can be easily transferred without spilling the contents.

[0034]

As described above in detail, according to the present invention, there is provided a bag for hermetically packaging a liquid content such as a liquid material, a granular material, etc., for example, a liquid content such as a beverage. After filling the bag and opening the bag, there is no problem with hygiene even if you use it by putting a mouth directly on the opening of the bag and drinking, and the sharp end of the cut surface at the open end of the bag. Without, it can be safely drunk, and even when the contents are transferred to other containers with pharmaceuticals and used,
There is an effect that it is possible to provide a bag which can be used hygienically without a risk of being contaminated at the periphery of the opening of the bag with high productivity. In addition, by forming the bottom of the bag in a self-standing bag form, the bag can be provided with excellent self-sustainability, can be easily handled, and can be provided with an excellent appearance and display effect.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of an embodiment of a bag according to the present invention.

FIG. 2 is a perspective view illustrating a folded shape of front and rear wall films at an upper portion of the bag shown in FIG. 1;

FIG. 3 is a front view showing the configuration of another embodiment of the bag of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Wall film 2 1st folded part 3 2nd folded part 4 Inner wall 5 Notch part 6 Heat seal part 7, 7' Bottom seal part 8 Side seal part 9 Weak line 10 Notch 11 Upper seal part 12 Bottom film fold back 13 Gusset 100,200 bags

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yuji Sugiyama 1-1-1 Ichigaya-Kagacho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. 3E064 AA05 AB25 EA30 FA04 HP01 HP02 HS10

Claims (3)

[Claims] 1. A bag formed by heat-sealing the peripheral edges of two front and rear wall films in a bag shape, wherein the upper portions of the front and rear wall films of the bag are respectively folded outwardly downward at first folding portions. After providing a folded surface of an appropriate length, it is again folded outward and upward at the second folded portion, and the upper end of the wall film is extended to a position higher than the first folded portion, The bag is provided with an inner wall having the first folded portion as an upper end by the first folded portion and the second folded portion, and the opening means of the bag extends outward and upward from the second folded portion. A bag provided at a position below the first folded portion of the provided wall film, wherein an upper portion of the inner wall projects upward when the bag is opened by the opening means. 2. A notch is provided at an upper corner on both right and left sides of an inner wall having a first turn-up portion provided at an upper end inside upper portions of front and rear wall surfaces of the bag. The bag according to claim 1, wherein the inner peripheral edge is sealed by heat sealing, and the opening means of the bag is provided so as to cross the cutout portions on both right and left sides. 3. The bottom portion of the bag is formed in a form having a gusset portion formed by folding a bottom film inward between lower portions of front and rear wall films and inserting the bottom film therein.
3. The bag according to claim 1, wherein the bag is heat-sealed with a seal pattern in which the inside is concave from both sides to the center, and is formed in a self-supporting form.