JP4549565B2 - bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bag for sealing and packaging a fluid content such as a liquid material or a granular material, and more specifically, when the upper portion of the bag is cut and opened inside the upper portion of the bag, The present invention relates to a bag in which an inner wall formed by folding a film at the upper end protrudes upward on both front and rear sides of the bag.
[0002]
[Prior art]
Conventionally, as a bag for hermetically wrapping contents having fluidity such as a liquid material and a granular material, there are, for example, a three-side seal type bag and a four-side seal type bag, and a self-standing bag type bag such as a standing pouch.
Usually, when taking out the contents of such a bag, a part of the bag, such as an upper side or a corner, is cut out to provide an opening, and the bag is poured out from the bag, or the bag is narrow to a part of the bag. A method has been adopted in which a spout portion having a width is provided in advance, a tip end portion thereof is cut and opened, and the spout portion is poured out.
[0003]
[Problems to be solved by the invention]
However, such a bag is, for example, a beverage whose contents are liquid or viscous liquid, and the volume of the bag is relatively small. Is generally contaminated with various bacteria attached, and has a problem of lack of hygiene.
In addition, when a part of the bag is cut out and an opening is provided, the opening end is the cut surface of the bag, often thin and sharp, and there is a problem of damaging the lips and tongue when directly mouthed .
Furthermore, even if the contents are pharmaceuticals, etc., and transferred to another container, if the outer periphery of the bag opening is contaminated, there is a high possibility of contamination and other foreign matters, which is a major hygiene problem. It becomes.
[0004]
The present invention has been made to solve such problems, and the object of the present invention is to drink contents such as a beverage filled in a bag by directly opening the mouth of the bag. Even if used in such a way, there is no problem in hygiene, there is no sharp part of the cut surface at the open end of the bag, it can be safely consumed, and the contents are other drugs and other containers It is an object of the present invention to provide a bag that can be used in a sanitary manner without the risk of being contaminated at the periphery of the opening of the bag even when it is used after being transferred.
[0005]
[Means for Solving the Problems]
The above problems can be solved by the following present invention.
That is, in the invention described in claim 1, in the bag formed by heat-sealing the peripheral edges of the two front and rear wall films in a bag shape, the upper portions of the wall films before and after the bag are respectively folded back to the first. Is folded back to the outside and provided with a folded surface having an appropriate length, and then folded back upward and outward again at the second folded portion, so that the upper end of the wall film becomes 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 opening means is provided with the second folded portion. It is provided at a position below the first folded portion of the wall film extending outward from the portion, and when the bag is opened by the opening means, the upper portion of the inner wall protrudes upward. It consists of a bag.
[0006]
As the opening means, in addition to an opening instruction line such as a cut line displayed by printing or the like and an opening instruction mark, an easy-opening means that facilitates an opening operation by tearing or the like as described below can be used.
These opening means may be used alone, particularly when an easy-opening means is used, but it is more preferable to use a plurality of them in appropriate combination.
[0007]
As the easy-opening means, (a) a method of providing a notch frequently used even in a normal bag, (b) a method of providing a weak line such as a perforation line on a part of a base material layer of a laminated film of a bag, C) Method of providing a half-cut line by laser light irradiation, etc. (d) Method of forming a long and small scar group by a mechanical method at the end of the bag (Easy to tear starting from the scar group) ), (E) In order to easily open 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, and the stretching direction coincides with the tearing direction when the bag is opened. There is a method of laminating and using this laminated film for a bag, etc., which can be appropriately selected or used in combination.
[0008]
In addition, although the 1-shaped notch and the V-shaped notch are often employ | adopted for the said notch, there is no restriction | limiting in the shape, What is necessary is just a shape which has the pointed part toward the tearing direction.
The half-cut line is not limited to a continuous linear half-cut line, and may be an intermittent half-cut line such as a perforation. Such a half-cut line may be one, but assuming that the tearing direction is deviated, a plurality of half-cut lines such as one or two on both sides of the center half-cut line are parallel. Alternatively, it can be provided in a shape that converges on the central half-cut line.
[0009]
By adopting the above-described configuration, when taking out the contents filled in the bag, the bag can be easily opened by the opening means provided at the top of the bag. Then, by opening the bag, the upper portion of the inner wall having the first folded portion as the upper end protrudes upward from the opening end of the outer wall film. Therefore, even when the contents are drinks and drinks with a mouth directly attached to the opening of the bag, the portion in contact with the mouth is the inner wall of the bag and the upper end is the folded portion, so contamination from the outside is not possible. As well as being sanitary, the touch is soft and the thin and sharp open end does not come into contact with the mouth so that it can be safely consumed.
Moreover, even when the contents are transferred to another container for use as a medicine, the contents can be used in a sanitary manner without touching the outer surface around the open end of the bag.
[0010]
The invention described in claim 2 is provided with notches at upper corners on both the left and right sides of the inner wall with the first folded portion provided as the upper end inside the upper part of the front and rear wall surfaces of the bag, 2. The bag according to claim 1, wherein the inner peripheral edge of the cutout is sealed by heat sealing, and the bag opening means is provided so as to cross the left and right cutouts. .
[0011]
By adopting such a configuration, in addition to the function and effect of the invention described in claim 1, a bag opening means is provided in a lateral linear shape at a position below the first folded portion. However, when the bag is opened, only the outer wall film can be easily torn and opened without tearing the inner wall.
Further, by making the opening means linear in the horizontal direction, the processing becomes easy and the opening operation can be performed more easily.
[0012]
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 the bottom film inwardly between the lower portions of the front and rear wall films, and the gusset portion is formed on the inner side. The bag according to claim 1 or 2, wherein the bag is heat-sealed with a seal pattern that is concave from both sides to the center, and is formed in a self-supporting form.
[0013]
As a typical example, the seal pattern in which the inner side for heat-sealing the gusset part at the bottom of the bag is concave from both sides to the central part is a ship bottom shape in which the inner side rises in a curved line shape from the center part to the both sides. , A bottom-bottom-shaped seal pattern in which both sides rise from the bottom of a certain width and length to the outside in a straight line shape, but is not limited thereto, for example, a V-shape with an obtuse angle inside, or U Any seal pattern can be used as long as the seal pattern has a concave shape from both sides to the center, such as a letter-shaped seal pattern.
[0014]
By adopting such a configuration, in addition to the operational effects of the invention described in claim 1 or 2, since the bag is provided with self-supporting properties, handling is facilitated, and the appearance, display effect, etc. are excellent. Can be.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the invention such as a film used for manufacturing a bag of the present invention and a method for manufacturing the bag will be described below.
As described above, the bag of the present invention is provided with the first and second folded portions on the upper part of the wall film on the two front and rear surfaces, and it is necessary to seal the left and right side edge portions by heat sealing. The wall film needs to have heat sealing properties on both sides. Therefore, for example, a single film having heat sealability or a laminated film in which a sealant layer is provided on both surfaces of a base material layer can be used.
[0016]
From the standpoint of bag strength and bag-making ease, 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.
It is preferable that the base material layer basically has mechanical strength, rigidity, heat resistance, etc. as a support, and further it is necessary to have gas barrier properties in order to improve the storage stability of the contents. There is also. Therefore, the base material layer itself may be formed of a single layer or a composite layer in which a plurality of materials are laminated.
[0017]
Examples of materials that can be suitably used for the base layer include, for example, paper such as high-quality paper and kraft paper, or paper with enhanced water resistance, and stretched films such as polyester, polyamide (various nylons), and polypropylene. In addition, a composite film obtained by laminating an aluminum foil, a plastic film deposited with an inorganic oxide such as silica or alumina, or a metal such as aluminum, a saponified ethylene-vinyl acetate copolymer, or the like as a gas barrier material is used. be able to.
[0018]
The following structures are mentioned as a typical example of the structure of the laminated | multilayer film which can be preferably used as a wall surface film of a bag.
(1) L / LDPE layer (sealant layer) / paper / L / LDPE 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) / Adhesive / 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 deposition layer) / Adhesive // L / LDPE film (sealant layer)
However, the present invention is not limited to these, and various combinations of laminated films can be used.
[0019]
In addition, when the bag is produced in a self-standing bag form such as a standing pouch, a bottom film is required, but the bottom film has the same configuration as the wall film or the outer sealant layer is removed from the configuration of the wall film. A laminated film having a structure can be used. Further, in the case of the bottom film, the rigidity is not so required, so that the thickness can be reduced to obtain the cost merit.
[0020]
In the configuration of the laminated film, the PET film is a biaxially stretched polyethylene terephthalate film, the ON film is a biaxially stretched nylon film, the L / LDPE is a linear low density polyethylene, and the EVOH film is an ethylene-vinyl acetate copolymer saponified product. It refers to a film.
Since the lamination between the layers is usually performed by a dry lamination method, an adhesive for dry lamination such as a two-component curable polyurethane adhesive can be used.
[0021]
Further, when paper is used for the base material layer, a sealant layer such as L·LDPE can be satisfactorily laminated without an adhesive by an extrusion coating method, and in this case, it is simply referred to as an L·LDPE layer. The surface of the paper can be further improved in adhesion by performing known easy adhesion treatment such as flame treatment (treatment also serving as kebab baking) or corona discharge treatment.
[0022]
As the sealant layer, only L·LDPE is exemplified, but L·LDPE is excellent in heat seal stability and content resistance, for example, stress cracking resistance against surfactants, etc. It is particularly suitable for liquid packaging.
In addition to the contents to be filled in the sealant layer, high-pressure low-density polyethylene, polypropylene, ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene Acrylic ester copolymers, ionomers, polyester resins, and the like can be appropriately selected and used.
[0023]
In particular, an ethylene / α-olefin copolymer polymerized using a single site catalyst such as a metallocene catalyst has a narrow molecular weight distribution and a stable copolymerization ratio. It has excellent sealing properties and is suitable for the sealant layer of a bag having a level difference due to the difference in film overlap in the heat seal part, as in the bag of the present invention, in that it can prevent the occurrence of pinholes due to missing seals. .
Furthermore, by using a blend of an olefin elastomer with the copolymer, the heat fluidity of the sealant layer is improved, and the generation of pinholes due to the steps can be more effectively prevented.
[0024]
Next, the manufacturing method of the bag of this invention manufactured using the above laminated films is demonstrated.
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 of turning the wall film on both sides of the upper portion of the bag twice, and the form of the main body of the bag is not particularly limited. For example, in addition to a three-side seal type or four-side seal type bag, a self-standing bag type such as a standing pouch can be adopted.
[0025]
With respect to the bag making machine for manufacturing such a bag, a machine capable of making a bag in a cross-flow manner is suitable, and it is preferable to use a bag making machine for a standing pouch having many processing sections.
In particular, by using a bag-making machine that is used as both a three-side seal type and a four-side seal type bag and a standing pouch (self-standing bag), the first and second folded portions provided on the upper and lower wall films are provided. It can be easily manufactured by additionally attaching necessary processing devices such as a processing device, a punching device in which a notch portion is provided in the folded portion, and a heat seal device around the notch portion.
[0026]
【Example】
Hereinafter, the present invention will be described more specifically with reference to the drawings. However, the present invention is not limited to these drawings. The same reference numerals are used for portions having the same names in different drawings.
FIG. 1 is a front view showing the configuration of an embodiment of the bag of the present invention, and FIG. 2 is a perspective view for explaining 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.
[0027]
The bottom 100 and the body of the bag 100 shown in FIG. 1 have a predetermined width at the bottom of the wall film 1, 1 'on the front and rear surfaces and the edge on both sides, as in a normal four-side sealed bag. It is formed by heat-sealing at the bottom seal portion 7 and the side seal portions 8, 8, and the upper portion of the bag is temporarily attached to the upper portions of the wall films 1, 1 ′ on the front and rear surfaces on the first folded portions 2, 2 ( 2), an appropriate length of the folded surface is provided, and then the second folded portions 3 and 3 are folded again outward and upward so that the upper end portions of the wall films 1 and 1 ' 1 folds up to a position higher than the folded portions 2 and 2 (up to the position of the upper seal portion 11 in FIG. 1), and the first folded portions 2 and 2 and the second Inner walls 4 and 4 (shown only on one side) with the first folded portions 2 and 2 as upper ends. In addition, notches 5 and 5 are provided at upper corners on both the left and right sides of the front and rear inner walls 4 and 4, and the inner peripheral edges of the notches 5 and 5 are heat sealed by heat seal portions 6 and 6. The left and right edge portions above the second folded portions 3 and 3 are heat-sealed at the upper portions of the body seal portions 8 and 8, and further, a weakening line 9 is used as a bag opening means. In addition, notches 10 and 10 are provided at both end portions thereof so as to cross the notch portions 5 and 5 on both the left and right sides.
[0028]
When the laminated film is used for the wall surface films 1 and 1 ', the weakening line 9 may be an intermittent cut line such as a perforation provided in the base material layer, or a half cut by laser light irradiation or the like. It may be a line.
The upper seal portion 11 is an unsealed opening before filling the contents, and heat seals after filling the contents from this portion.
[0029]
By taking such a configuration, when the contents filled in the bag 100 are taken out, the unsealing means provided at the top of the bag, that is, the notch 10 and the weakening line 9 are used to follow the weakening line 9. The top of the bag can be easily torn and opened. And the opened bag 100 can be made into the form which the inner wall 4 which makes the 1st folding | turning part 2 an upper end protrudes upwards rather than the opening end by the weak line 9 in the upper part.
Accordingly, even when the contents are filled with, for example, a liquid or viscous liquid beverage and the mouth is directly attached to the opening of the opened bag, the portion that comes into contact with the mouth is the inner wall 4. In addition, it is hygienic and free from external contamination, and since the upper end of the inner wall 4 is the folded portion 2, the touch is soft and the touch is soft and the lips and tongue are not damaged. Safe to drink.
In addition, even if the contents are pharmaceuticals such as liquids and are transferred to other containers and used, there is no risk of contamination at the periphery of the opening of the bag when pouring out. Can do.
[0030]
The bag 200 shown in FIG. 3 is configured by changing only the configuration of the bottom portion of the bag in the configuration of the bag 100 shown in FIG. The body part and the upper part are formed in the same manner as the bag 100 shown in FIG.
That is, the bottom portion of the bag 200 is formed in a form having a gusset portion 13 formed by folding the bottom film inwardly between the lower portions of the wall film 1, 1 'on both sides and inserting it to the bottom film folding portion 12. The portion 13 is configured by heat-sealing at the bottom seal portions 7 and 7 'of the seal pattern in which the inside is concave from both sides to the central portion, in this case, the seal pattern is concave in a V shape opened at an obtuse angle. is there.
[0031]
However, the heat seal at the bottom needs to adopt a different method depending on the configuration of the bottom film. For example, the bottom film is provided with a sealant layer on both surfaces of the base material layer similar to the wall film 1, 1 '. When the bottom film having the structure is used, the bottom seal is formed by heat-sealing the pleated portions before and after the gusset portion 13 separately by the bottom seal portion 7 and then heat-sealing the bottom seal portions 7 'on both sides. Heat sealing of the parts 7 and 7 'can be performed.
[0032]
In addition, when using a bottom film with a structure in which a sealant layer is provided only on one side of the base material layer, when the bottom film is folded back and inserted, the sealant layer is folded back and inserted. By doing so, heat sealing of the bottom seal portions 7 and 7 'can be performed simultaneously.こ の In this case, although not shown in the drawing, it is preferable to insert notches in the vicinity of the lower ends of both sides of the bottom film to be folded and inserted, and heat-sealed. Since the part is heat-sealed at the notch part and cannot be opened back and forth, ring-shaped legs are formed on the outer periphery of the bottom part of the bag by the heat-seal part, and excellent independence can be imparted.
[0033]
In this way, by configuring the bag 200 as shown in FIG. 3, in addition to the operational effects described in the bag 100 shown in FIG. Can be easily handled, and at the same time, the appearance and display effect can be improved.
In addition, as shown in the figure, the bag 200 filled with the contents of the bottom 200 has a transverse cross-section at the bottom by making the seal pattern of the bottom seal portion 7 into a V-shaped concave recess with an obtuse angle inside. Becomes a rhombus shape and spreads back and forth, and the wall film is bent so as to form a ridge line upward from the vertex of the V-shape.
Accordingly, 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 pouring width of the content is narrowed. When you do it, it becomes easier to drink. This is the same when the contents are transferred to another container, and the contents can be easily transferred without spilling out.
[0034]
【The invention's effect】
As described above in detail, according to the present invention, the bag mainly seals and wraps a fluid content such as a liquid material or a granular material, for example, filled with a liquid content such as a beverage, After opening the bag, there is no problem with hygiene, and there is no sharp part of the cut surface at the opening end of the bag, even if you use it by directly opening the mouth of the bag and drinking. A bag that can be drunk and that can be used in a sanitary manner without the risk of being contaminated at the periphery of the opening of the bag even when the contents are transferred to another container for use as a medicine. Can be provided with high productivity.
Further, by forming the bottom portion of the bag in a self-standing bag form, the bag can be provided with excellent self-supporting properties, can be easily handled, and can provide a bag with 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.
2 is a perspective view for explaining a folded shape of front and rear wall films in the upper portion of the bag shown in FIG. 1; FIG.
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 surface film 2 1st folding | turning part 3 2nd folding | turning 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 folding part 13 Gusset part 100, 200 bag

Claims (3)

In the bag formed by heat-sealing the peripheral edge portions of the two front and rear wall films in a bag shape, the upper portions of the front and rear wall films of the bag are folded outward and downward at the first folded portions, respectively. After the second folded portion is provided, the second folded portion is folded again outward and upward, and the upper end of the wall film is extended to a position higher than the first folded portion. A wall film in which an inner wall having the first folded portion as an upper end is provided by one folded portion and a second folded portion, and the bag opening means is extended outward from the second folded portion. A bag characterized in that the upper portion of the inner wall protrudes upward when the bag is opened by the opening means and provided at a position below the first folded portion. Cutouts are provided at the upper corners on both the left and right sides of the inner wall with the first folded portion provided inside the upper part of the front and rear wall surfaces of the bag as the upper end, and the inner periphery of the cutout is heat-sealed. 2. The bag according to claim 1, wherein the bag opening means is provided so as to cross notches on the left and right sides. The bottom portion of the bag is formed in a form having a gusset portion formed by folding the bottom film inwardly between the lower portions of the front and back wall film, and the gusset portion is concave from the inside to the center portion The bag according to claim 1 or 2, wherein the bag is heat-sealed with a seal pattern and has a self-supporting type.

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