JP4973298B2 - Self-supporting bag - Google Patents

Description

  The present invention relates to a self-supporting bag, and more specifically, in the field of self-supporting bags in which the bottom portion of the bag is formed in a gusset form to provide self-supporting properties, the bag has sealing properties and self-supporting properties, and the top of the bag When it is cut and opened, the mouth of the opened bag opens automatically and it is easy to take out the contents such as various filled foods, and the bag can be used as a container for tableware as it is. Regarding bags.

  Conventionally, as a self-supporting bag, a self-supporting bag such as a standing pouch type that has a bottom portion formed in a gusset form to provide self-supporting characteristics is excellent in self-supporting characteristics, and has some features as a three-dimensional container. Therefore, it is widely used for hermetically wrapping a wide range of contents including solid contents, granular and powdery contents, and liquid contents.

Such a standing pouch-type self-supporting bag is usually made of a laminated film mainly made of plastic, and the laminated film itself is a flexible material. When the contents filled in the self-supporting bag are taken out, the bag is used. Cut and open the heat seal part at the top of the paper, open it by opening it on both sides by hand, and then release it, the opening part will return to its original state due to the elasticity of the laminated film, and the mouth part will narrow and the contents will be reduced. There was a problem that it was difficult to take out.
In order to solve this problem, for example, there has been a method of enclosing a metal wire such as a wire that is easily plastically deformed around the mouth of the bag. However, when a metal wire is sealed, there is a problem that the disposal process becomes difficult even if it is incinerated when it is disposed of after disposal. For this reason, a material that replaces the metal wire, is easy to dispose of, is easily plastically deformed, and a member that can hold the opening of the bag has been developed, and a bag that can be attached to hold the opening of the bag has been developed. Various proposals have been made.

  As a bag having such an opening holding function, for example, as (1) “bag capable of holding the shape of the bag mouth”, it is made of plastic along the bag mouth of the plastic bag, preferably outside the bag mouth, Preferably, a polyolefin shape-retaining tape is fused or bonded, and the shape-retaining tape is a plastic tape that is rolled and stretched in the length direction at a total draw ratio of 10 to 40 times, and is bent at any part. In some cases, there is a bag that can be easily bent to an arbitrary angle and then hold the previous bending angle until a force for correcting to a different bending angle is applied (see Patent Document 1).

Further, (2) as a “shape holding tape and packaging bag”, the shape holding tape includes a shape holding layer mainly composed of a thermoplastic resin having a benzene ring in the main chain, the shape holding layer One composed of polyethylene terephthalate as a main component, one composed of amorphous polyethylene terephthalate as a main component for the shape retention layer, and one composed of polybutylene terephthalate as a main component for the shape retention layer. There is a packaging bag in which such a shape-retaining tape is provided along the periphery of the opening of a packaging bag made of a thermoplastic resin (see Patent Document 2).
Japanese Patent Laying-Open No. 2005-88893 (pages 2 to 4, FIGS. 1 to 3) Japanese Unexamined Patent Publication No. 2004-244023 (second page, FIG. 1 and FIG. 2)

  However, in the “bag that can hold the shape of the bag mouth” described in Patent Document 1, the shape holding tape is made of plastic, preferably made of polyolefin, and rolled in the length direction to a total draw ratio of 10 to 40 times. It is produced by stretching, and the stretching process is relatively slow and inferior in productivity, is expensive in terms of cost, and is also processed in such a way that a separate shape retaining tape is attached to the mouth of the bag. There was a problem that the process increased and the cost was increased.

  Further, in the “shape-retaining tape and packaging bag” described in Patent Document 2, the shape-retaining tape includes a shape-retaining layer containing a thermoplastic resin as a main component, as shown in FIG. It is composed of a heat seal layer that surrounds the periphery or laminated on both sides thereof, and in order to obtain an effective shape-retaining effect for the shape-retaining layer, it is necessary to properly mix it, and the manufacturing process However, there is a problem that the cost is expensive. Also in this case, it is necessary to attach another shape-retaining tape along the periphery of the opening of the bag, and in addition to the material cost of the shape-retaining tape, there is a problem that the number of mounting processing steps increases and the cost increases. there were.

  The present invention has been made to solve such problems, and the problem is that a self-standing bag made of a laminated film in which the bottom portion of the bag is formed in a gusset form to provide self-supporting property, the bag is sealed. When taking out the contents of various filled foods, etc., the mouth of the bag automatically opens and opens automatically. Even if it is powdery or granular, a self-supporting bag with excellent openability that can be easily and safely removed with a spoon, etc. It is to provide inexpensive and high productivity without using a special separate member such as an opening assisting member.

The above problems can be solved by the following present invention.
That is, in the invention described in claim 1, the bag body has a gusset portion formed by heat-sealing the edge portions on both sides of the laminated film on the front and back wall surfaces, and the bottom of the bag folded back from the laminated film. In a self-supporting bag formed in a form and heat-sealed with a bottom-bottomed seal pattern in which the gusset portion is low in the center and both sides gradually rise toward the side of the bag, the bottom-shaped seal pattern, the height of lower heat-sealed portion of the central portion of the gusset portion, the opposite sides of a height lower heat-sealed portion of the central portion of the gusset bag higher position over the upper end of the gusset portion is formed by a heat-sealed portion gradually becomes higher shape over the side, to adhere the inner faces of both side edges of the folds of the front and rear of the gusset portion, the front and rear across folds of the front and rear Connection to prevent opening Parts is a region of gradually becomes higher heat-sealed portion of the shape from both sides of the lower heat-sealed portion of the height of the central portion toward the side of the bag higher position over the upper end of the gusset portion of the gusset portion provided that the gusset portion bottom respectively provided along the Rutotomoni, the distance from the lower side edge of the gusset portion to the adhesive section, the length corresponding to the folding height of at least gusset portion within It consists of a self-supporting bag characterized by being .

In the present invention, the laminated film used for the production of the self-supporting bag is not particularly limited, and any known multi-layer film conventionally used for self-supporting bags such as a standing pouch can be used.
Further, in the present invention, the bottom-shaped seal pattern for heat-sealing the bottom portion of the self-supporting bag includes a heat seal portion having a low height at the center portion of the gusset portion and a heat seal portion having a low height at the center portion of the gusset portion. from both sides are formed by a heat-sealed portion gradually becomes higher shape over the sides of the bag higher position over the upper end of the gusset portion, for example, the height of the central portion of the gusset portion of the lower heat seal portion, a shape having a heat-sealed portion straight a predetermined width in the horizontal direction, further from both sides of a height lower heat-sealed portion of the central portion of the gusset portion beyond the upper end of the gusset portion the heat-sealed portion gradually becomes higher shape over the sides of the bag a high position, from both sides of the linear heat-sealing portions provided in the horizontal direction of the bag of the higher position over the upper end of the gusset portion straight over to the side May be formed as gradually becomes higher shape Jo, also said the height of lower heat-sealed portion of the central portion of the gusset portion, the both sides of the lower heat-sealed portion of the height of the central portion of the gusset portion it may be a shape formed both heat-sealed portion gradually becomes higher shape curved over the sides of the bag higher position over the upper end of the gusset portion.
Only, the case of forming a curved both as described above, since the boundary between them becomes unclear, the height of lower heat-sealed portion of the central portion of the gusset portion, the predetermined width provided horizontally a linear hot sealing portion, gradually becomes higher shape from both sides of the lower heat-sealed portion of the height of the central portion over the sides of the bag higher position over the upper end of the gusset portion of the gusset portion You may form a heat seal part as a heat seal part of the shape which becomes high gradually in curvilinear form.

Further, the inner surfaces of both side edge portions of the front and rear hook-shaped portions of the gusset portion are bonded to each other, and an adhesive portion for preventing the entire front and rear hook-shaped portions from opening back and forth is provided at the center of the gusset portion. Along the bottom side of the gusset portion in the region of the heat seal portion having a shape that gradually increases from both sides of the heat seal portion having a low height to the side portion of the bag at a higher position beyond the upper end of the gusset portion. each provided Rutotomoni, bottom distance from the lower side edge of the gusset portion to the adhesive section, a method of Ru formed to be the length corresponding to the folding height of at least gusset portion, which is folded in gusset In the predetermined part of the laminated film, a bottom film cutout is provided in a continuous or a plurality of spots, and the inner surfaces of the laminated films on the front and rear wall surfaces are in contact with each other at the bottom part of the bag. The ship bottom Of when heat-sealed with a sealing pattern, simultaneously inner surfaces of the laminated film before and after the wall of this part, it is preferable to adopt a method of corrugated portions of the front and rear are thermally bonded at the sealant layer is bonded.

  In the present invention, the structure of the upper part of the self-supporting bag is not particularly limited, and opening means such as a cut line, a notch and a half cut line are provided at the opening position below the upper seal part that seals the upper edge part. Arbitrary structures, such as the structure provided, the structure which attached the chuck tape to the inner surface of the bag of the lower side of the opening means, etc., can be taken.

  The invention described in claim 2 has a shape that gradually increases from both sides of the heat seal portion having a low height at the center portion of the gusset portion to the side portion of the bag at a higher position beyond the upper end of the gusset portion. The heat seal portion is provided in a shape that gradually increases toward the side portion of the bag at a height position that is at least twice the height of the gusset portion beyond the upper end of the gusset portion. It consists of the self-supporting bag of 1 description.

  The heat seal part having a shape that gradually increases from both sides of the heat seal part having a low height at the center of the gusset part toward the side part of the bag at a higher position beyond the upper end of the gusset part, Combined with the adhesive part that bonds the ridge-like parts before and after the gusset part provided at least the length corresponding to the folding height of the gusset part from the both side ends of the lower part toward the center part, While restricting the spreading shape of the bag at the time of taking out, it has an auxiliary function to hold the spreading shape. Accordingly, the height of the heat seal portion is preferably at least twice the height of the gusset portion, and less than twice is not preferable because it is difficult to obtain an auxiliary function for maintaining the spread shape of the bag.

  The invention described in claim 3 is characterized in that the external shape of the self-supporting bag is rectangular, and the ratio of the length to the length is in the range of 0.8 to 2 for the length of 1 and the width. It consists of the self-supporting bag of Claim 1 or 2.

The self-supporting bag of the present invention, in particular, when taking out the filled contents, cuts and opens the top of the bag, so that the bag spreads back and forth and the mouth portion opens widely, and the expanded shape is maintained. For that purpose, the shape of the self-supporting bag is preferably rather long rather than vertically long, and as described above, the outer shape of the self-supporting bag is rectangular, It is preferable that the ratio of length to width is in the range of 0.8 to 2 in the width to 1 in the length.
If the ratio of the length to width is less than 0.8 for the length of 1 and the width is less than 0.8, the opening at the mouth of the bag becomes gradually smaller and the ease of taking out the contents is unfavorable. In addition, when the length exceeds 1 and the width exceeds 2, there is no problem in the ease of taking out the contents, but it is not preferable because the handleability as a bag is lowered.

According to the invention described in claim 1, the bag body has the gusset portion formed by heat-sealing the edge portions on both sides of the laminated film on the front and back wall surfaces, and the bottom portion of the bag folded back from the laminated film. In a self-supporting bag formed in a form and heat-sealed with a bottom-bottomed seal pattern in which the gusset portion is low in the center and both sides gradually rise toward the side of the bag, the bottom-shaped seal pattern, the height of lower heat-sealed portion of the central portion of the gusset portion, the opposite sides of a height lower heat-sealed portion of the central portion of the gusset bag higher position over the upper end of the gusset portion is formed by a heat-sealed portion gradually becomes higher shape over the side, to adhere the inner faces of both side edges of the folds of the front and rear of the gusset portion, the front and rear across folds of the front and rear Connection to prevent opening Parts is a region of gradually becomes higher heat-sealed portion of the shape from both sides of the lower heat-sealed portion of the height of the central portion toward the side of the bag higher position over the upper end of the gusset portion of the gusset portion configured the gusset portion bottom respectively provided along the Rutotomoni, the distance from the lower side edge of the gusset portion to the adhesive section, the length corresponding to the folding height of at least gusset portion within Therefore, when the self-supporting bag is filled with the contents, the bag spread shape is such that, at the bottom of the bag, the adhesive part that bonds the ridge-like parts before and after the gusset part is the both side ends of the lower part of the gusset part. Are provided at a length corresponding to at least the folding height of the gusset part from the center to the center part, so that the center part of the gusset part excluding this adhesive part extends back and forth, and the upper part from there Shaped Inside is greater spread shape back and forth along the heat-sealed portions on both sides of the edge portions of the inner lines and the bag on both sides of Rupatan.

And even if the remaining amount is reduced after the contents are taken out, the bottom of the bag has an adhesive part that bonds the front and rear hook-shaped parts together, and the heat seal with a low height at the center part of the gusset part each provided Rutotomoni from both sides of the section along the bottom of the gusset portion in the region of the heat-sealed portion gradually becomes higher shape toward the side of the bag higher position over the upper end of the gusset portion, Since the distance from the lower side end portion of the gusset portion to the adhesive portion is at least a length corresponding to the folding height of the gusset portion, the end portion on the central portion side of the adhesive portion is As a starting point, from the intersection of the upper end of the gusset part and the inner line of the inclined part of the ship-bottom heat seal part, toward the outer upper end of the bag, the bag shape is reversed due to the rigidity of the laminated film of the bag. The bulge line of the bag Made is, the bulge in the inside of the line spread laminated film before and after, the outer becomes laminated film before and after the closing. Therefore, it is possible to provide a self-supporting bag that can keep the mouth of the bag open even when the content filled in the bag is reduced and the internal pressure due to the content is no longer applied to the bag.
For the formation and holding of the bag bulge line, when the bag is unfolded back and forth, the bottom laminated film folded upward in the gusset portion is pushed down along the ship bottom heat seal portion. It is needless to say that the stretching force of the laminated film on the bottom surface that is spread back and forth contributes to the front and back at the same time.

  According to the invention described in claim 2, in the structure of the self-supporting bag of the invention described in claim 1, it further exceeds the upper end of the gusset part from both sides of the heat seal part having a low height at the center part of the gusset part. The shape of the heat seal portion that gradually increases toward the side of the bag at the high position gradually increases toward the side of the bag at the height position that is at least twice the height of the gusset portion beyond the upper end of the gusset portion. In addition to the function and effect of the invention described in claim 1, the upper end of the bulge line of the bag that expands the bag forward and backward becomes closer to the upper end of the bag. Thus, the mouth of the bag can be opened more reliably.

  According to the invention described in claim 3, in the structure of the self-supporting bag of the invention described in claim 1 or 2, the external shape of the self-supporting bag is a rectangular shape, and the ratio of the length to the length is vertical. Since the width is in the range of 0.8 to 2 with respect to 1, in addition to the effects of the invention described in claim 1 or 2, when taking out the shape of the self-supporting bag, in particular, the contents, The shape when the upper heat seal part is cut out and the bag is opened is not particularly vertically long, rather it is horizontally long or close to it, so that the mouth of the bag can be opened more reliably. become.

Hereinafter, a laminated film used for manufacturing a self-supporting bag of the present invention and embodiments of the self-supporting bag will be described with reference to some drawings.
First, the laminated film used for the production of the self-supporting bag of the present invention is not particularly limited, and any known laminated film used for various types of bags can be used.
Although the laminated film of the same structure may be used for the laminated film used for the wall surface of the self-supporting bag and the laminated film used for the bottom surface, laminated films having different structures may be used as necessary.

As the laminated film, in a simple configuration, a laminated film having a configuration in which a sealant layer is laminated on a base film layer is used. However, the type and amount of contents filled in a bag, or water vapor and other gas barrier properties. Depending on the performance required, such as light shielding properties and various mechanical strengths, water vapor and other gas barrier layers, light shielding layers, strength improving layers, etc. were laminated between the base film layer and the sealant layer. A laminated film of construction can be used.
The above-mentioned base film layer, water vapor and other gas barrier layers, light shielding layer, strength improving layer, sealant layer and the like may each be formed as a single layer, or may be formed by laminating a plurality of layers. .

As the base film layer, a biaxially stretched film of polyester such as polyethylene terephthalate or polyethylene naphthalate, a biaxially stretched film of polyamide such as nylon 6, nylon 66, MXD6 (polymetaxylylene adipamide), or biaxially stretched A plastic film such as a polypropylene film can be suitably used, and synthetic paper, paper, and the like can also be used.
These may be used singly or may be used by combining a plurality.

  Examples of the gas barrier layer include films of saponified ethylene / vinyl acetate copolymer (EVOH), polyvinylidene chloride (PVDC), MXD6, polyacrylonitrile (PAN), metal foil such as aluminum foil, or silica. Biaxially stretched with a vapor-deposited layer of inorganic oxide such as alumina, zinc oxide, magnesium oxide or ITO, or a metal such as aluminum, or a coating layer such as PVDC, polyvinyl alcohol (PVA) or polyacrylic acid (PAA) A nylon film (ON film), a biaxially stretched polyethylene terephthalate film (PET film), a biaxially stretched polypropylene film (OPP film), or the like can be used.

The inorganic oxide or metal vapor-deposited layer can be formed by being deposited on the base film so as to have a thickness of about 200 to 1200 mm by means of vapor deposition, sputtering, ion plating or the like.
The inorganic oxide vapor-deposited layer may be formed of a single layer, but by forming it with a plurality of layers, a more excellent gas barrier property can be obtained.
In addition, the deposited layer of the inorganic oxide improves the adhesion or prevents damage such as cracks and effectively exhibits excellent gas barrier properties. Reactive acrylic resin, polyurethane resin, acrylic resin containing silane coupling agent, water-soluble polymer containing metal alkoxide, ethylene / vinyl acetate A gas barrier layer can be formed as a composite layer by providing a resin layer such as a polymer saponified product.

Of the gas barrier layers, an aluminum foil or a film provided with an aluminum vapor deposition layer is opaque and can also serve as a light shielding layer.
As the strength improving layer, any one of the base films may be additionally laminated as appropriate, and a biaxially stretched high-density polyethylene film or the like may also be laminated as a moisture-proof layer.
A known dry lamination method or extrusion lamination method (sandwich lamination method) can be used for laminating the base film layer, the gas barrier layer, the light shielding layer, and the strength improving layer.

In addition to linear low density polyethylene (L / LDPE), the sealant layer includes low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene / α-olefin copolymer, ethylene A vinyl acetate copolymer, an ethylene / acrylic acid copolymer, an ethylene / acrylic acid ester copolymer, an ionomer, or the like can be used.
The sealant layer is laminated by forming the above resin into a film and laminating it by a dry lamination method or an extrusion lamination method, or by applying the above resin onto a laminated surface such as a base film layer or a gas barrier layer. Then, a method of laminating can be adopted. However, in the case where the content easily penetrates into the sealant layer or contains it, it is preferable to laminate by the dry lamination method.

The linear low density polyethylene (L / LDPE) is excellent in heat seal stability and content resistance, for example, stress cracking resistance against surfactants, etc., for packaging contents that require these performances. Suitable for
In addition, ethylene / α-olefin copolymers polymerized using a single site catalyst have a narrow molecular weight distribution and a stable copolymerization ratio, so they have excellent low-temperature heat sealability and hot sealability. As in the self-supporting bag of the present invention, a self-supporting bag formed by providing a gusset portion at the bottom, or a sealant layer of a bag having a step difference due to a difference in film overlap on a heat seal portion such as a normal gusset bag It is suitable in that it can prevent the occurrence of pinholes due to disconnection.

Next, the self-supporting bag of the present invention manufactured using the laminated film as described above will be described with reference to the drawings. However, the present invention is not limited to these drawings unless it exceeds the gist.
FIG. 1 is a front view showing the configuration of the first embodiment of the self-supporting bag of the present invention.
FIG. 2 is a front view showing the configuration of the second embodiment of the self-supporting bag of the present invention.
FIGS. 3A and 3B are views for explaining a conventional self-standing bag spreading shape, wherein FIG. 3A is a top view of the self-standing bag, FIG. 3B is a front view of the self-standing bag, and FIG. 3C is a bottom view of the self-standing bag.
4A and 4B are diagrams for explaining the spreading shape of the self-supporting bag according to the present invention. FIG. 4A is a top view of the self-supporting bag, FIG. 4B is a front view of the self-supporting bag, and FIG. .

The self-supporting bag of the present invention can be configured as shown in FIGS.
The self-supporting bag shown in FIGS. 1 and 2 can also be manufactured by a method in which the bottom portion is folded back into a gusset form using a single laminated film, but the laminated film on the front and rear wall surfaces and the laminated film on the bottom surface are separated from each other. Since it is easier to manufacture a bag using a three-piece laminated film, the following description will be made assuming that this method is used.

The self-supporting bag 100 shown in FIG. 1 is formed by folding the bottom laminated film inwardly between the bottom of the laminated film 1, 1 ′ on the front and rear wall surfaces of the bag and inserting it to the laminated film folding portion 2 on the bottom. The lower portion of the bottom laminated film formed in the form having the gusset portion 4 and corresponding to at least the folding height h ₁ of the gusset portion 4 from the end portions on both sides toward the center portion. In this case, the laminated film cutouts (3a, 3b), (3c, 3d) on the bottom surface of the semi-elliptical or semicircular shape are provided at both ends up to the length w, and the gusset part 4 is heat-sealed. The center part of the seal pattern is a heat seal part 5 which is a straight line with a predetermined width in the horizontal direction and has a low height, and both sides thereof extend beyond the upper end 2 of the gusset part 4 from the side part of the bag at a higher position. Gradually toward The heat seal portions 6a and 6b having a shape that is higher than the height, more specifically, twice the height h ₁ of the gusset portion 4 from the end of the heat seal portion 5 having a low height to the upper end 2 of the gusset portion 4 the height increases linearly toward the sides of the bag of h ₂ shape of the heat seal portion 6a, as ship bottom shaped seal pattern composed 6b, formed by heat sealing the bottom portion of the bag including the gusset 4 The bag body is formed by heat-sealing the left and right edge portions of the laminated films 1 and 1 'on the front and rear wall surfaces with side seal portions 8a and 8b.

It should be noted that a straight line extends from both side end portions of the heat seal portion 5 having a low height to the side portion of the bag having a height h _{2 that is} twice the height h ₁ of the gusset portion 4 beyond the upper end 2 of the gusset portion 4. As shown in the drawing, the length of the bottom sides of the heat seal portions 6a and 6b having a shape that is higher than the length may be about 4 to 6 mm longer than the length w corresponding to the height h ₁ of the gusset portion 4. preferable.
The height h ₂ of the heat seal portions 6a and 6b is twice as high as the height h ₁ of the gusset portion 4, but may be at least twice as high, specifically, the gusset portion 4 it is preferable for the height 2 to 3 times the height of h _1.
In addition, a non-sealed portion 7a or a non-sealed portion 7b is provided at the center of the heat seal portions 6a and 6b. This is a solid-state seal head when the area of the heat seal portions 6a and 6b is large. When heat sealing is performed, excessive heat is applied to the central portion, and the laminated film is deformed or damaged. This is provided to prevent this, and may be omitted if unnecessary.
Further, a length w corresponding to at least the folding height h ₁ of the gusset portion 4 is formed at the lower portion of the laminated film on the bottom surface inserted into the gusset portion 4 from the end portions on both sides toward the center portion. The laminated film cutouts (3a, 3b), (3c, 3d) on the bottom surface of the semi-elliptical or semicircular shape provided at the two ends until the ends of the laminated film on the front and rear wall surfaces are in contact with each other at this portion. Therefore, when the bottom portion of the bag is heat-sealed with the ship-bottom-shaped seal pattern, the front and rear hook-shaped portions formed on the gusset portion 4 are laminated film cutout portions (3a, 3b), ( 3c and 3d) are thermally bonded. Therefore, even when the self-supporting bag 100 is unfolded back and forth, the spread of the gusset portion 4 is stopped at this portion, and the above-described bulge line of the bag extends from the inner end portions of the cutout portions 3b and 3d to the upper end of the gusset portion 4. 2 and the inner line of the sloped portion of the bottom-shaped heat seal part, it is formed in the shape of a reverse letter C on the outer side of the bag in a straight line, greatly opening the mouth of the bag and opening the opening It is to hold.

FIG. 2 is a front view showing the configuration of the second embodiment of the self-supporting bag of the present invention. The self-supporting bag 200 shown in FIG. 2 is a gusset portion 4 in the configuration of the self-supporting bag 100 shown in FIG. Toward the side of the bag having a height h _{2 that is} twice as high as the height h ₁ of the gusset portion 4 from both side ends of the heat seal portion 5 having a low center height, beyond the upper end 2 of the gusset portion 4. Only the shape of the heat seal portions 6a and 6b having a shape that rises in a straight line extends from the both end portions of the heat seal portion 5 having a low height to the upper end 2 of the gusset portion 4, and the height h ₁ of the gusset portion 4 is 2 The heat seal portions 6a and 6b are formed so as to be curvilinearly raised toward the side portion of the double-height h ₂ bag, and the other configurations are all self-supporting bags 100 shown in FIG. And formed in the same manner.
Even when such a configuration is adopted, it is possible to obtain the same operational effects as those described for the self-supporting bag having the configuration shown in FIG.

FIGS. 3A and 3B are views for explaining a conventional self-standing bag spreading shape, wherein FIG. 3A is a top view of the self-standing bag, FIG. 3B is a front view of the self-standing bag, and FIG. 3C is a bottom view of the self-standing bag.
A conventional free-standing bag, for example, a standing pouch-type free-standing bag, is formed by forming the bottom of the bag in a form having a gusset portion 4 and being inserted inside the gusset portion 4 as shown in FIG. In this case, semi-circular bottom laminated film cutouts 3a and 3c are provided in the vicinity of the lower ends of both sides of the bottom laminated film, and the gusset part 4 is curved in a linear shape from the inside to the center. The bottom is formed by heat sealing at the bottom seal portion 10 of the concave bottom seal pattern, and the body of the bag is the side seal portion at the left and right edge portions of the laminated films 1 and 1 'on the front and rear wall surfaces. 8a and 8b are heat sealed.
When such a self-supporting bag is filled in a state in which the contents are almost full, the entire bag spreads in a cylindrical shape along the side seal portions 8a and 8b on both sides due to the internal pressure, but the content is small. The bottom of the bag spreads back and forth as shown in the bottom view of FIG. 3 (c). However, the bag body extends from the upper ends on both sides of the bottom seal portion 10 of the bottom of the gusset portion 4 to the bottom of the bag. As shown in the closed regions 9a and 9b of the bag shown by the hatching of the broken lines toward the upper end, the laminated films 1 and 1 'on the front and rear wall surfaces are narrowed in a letter C shape, and the upper surface of FIG. As shown in the figure, both sides were closed except for a slight opening at the center, which made it difficult to take out the contents.

On the other hand, FIG. 4 is a diagram for explaining the spreading shape of the self-supporting bag of the present invention. Specifically, the self-supporting bag 100 having the configuration shown in FIG. 1 is illustrated as an example. The top view of a self-supporting bag, (B) is a front view of the self-supporting bag, and (C) is a bottom view of the self-supporting bag.
Although the self-supporting bag of the present invention has been described with reference to FIG. 1, as shown in the front view of FIG. 4 (B), not only when the content is sufficiently filled, but also when the amount of the content is reduced. Or even when the bag is emptied, the ridges on the front and back of the gusset part 4 are folded into the inside of the gusset part 4 and the ends on both sides of the bottom of the laminated film on the bottom, respectively, Laminated film cutouts 3a, 3b, 3c, 3d (bottom of semi-elliptical or semi-circular shape) provided at a total of four locations with a length corresponding to the folding height of the gusset 4 toward the center. As shown in the bottom view of the self-supporting bag of FIG. 4 (C), the expansion of the hook-shaped portion before and after the gusset portion 4 is thermally bonded at the portion shown in FIG. Stopped at the position of the laminated film cutouts 3b and 3d, A state in which only the spread Hisashibu.
As a result of the restriction of the front and rear ridges of the gusset 4 in this way, the bottom layer is laminated by the thrust of the bottom layer laminated film that is pushed down and spreads forward and backward and the rigidity of the laminated film. From the inner side of the film cutouts 3b and 3d, through the intersection of the upper end of the gusset part 4 and the inclined parts on both sides of the bottom-shaped heat seal part, toward the upper diagonally outer side of the bag, in a straight line shown by the broken line A bag bulge line is formed. Inside the bulge line, the front and rear laminated films 1 and 1 'spread, and on the outer side, the front and rear laminated films 1 and 1' are indicated by broken line hatching regions 9a and 9b. As shown in the top view of the self-supporting bag of FIG. 4A, the upper portion of the bag is held in a largely open state. Therefore, the contents filled in the bag can be easily taken out to the end.

  Hereinafter, the present invention will be described more specifically with reference to examples.

The self-supporting bag having the configuration shown in FIG. 1 was made into a bag having the following dimensions by using a laminated film having the following configuration in common on the wall surface and the bottom surface of the bag to obtain a self-supporting bag of Example 1.
(1) Structure of laminated film (1, 1 ′) (outside) biaxially stretched nylon film (hereinafter referred to as ON film) (thickness 15 μm), printing layer / adhesive / silicon oxide vapor deposition layer, biaxially stretched polyethylene terephthalate film ( Hereinafter, silicon oxide vapor-deposited PET film (thickness 12 μm) / adhesive / linear low density polyethylene (hereinafter L·LDPE) film (thickness 80 μm)
The above films are bonded together by a dry lamination method, and the adhesive between the films uses a two-component curable polyurethane adhesive for dry lamination (coating amount when dried: 3 g / m ² ). It is.

(2) Dimensions of each part of the self-supporting bag The external dimensions of the self-supporting bag are as follows: the width is 180 mm, the length is 170 mm, and the height of the bottom gusset part 4, that is, from the bottom of the bag to the laminated film folding part 2 on the bottom The height h ₁ was 40 mm.
The bottom seal pattern that heat seals the bottom of the bag including the gusset portion 4 is a heat seal portion 5 having a low height at the lower edge of the central portion of the gusset portion 4, a width of 6 mm and a length of 70 mm. The linear seal pattern is provided in a shape arranged in the horizontal direction, from the end of the heat seal portion 5 having a low height on both sides thereof to the side portion of the bag at a higher position beyond the upper end 2 of the gusset portion. The heat seal portions 6a and 6b having gradually increasing shapes have a bottom length of 55 mm and a height h ₂ of 80 mm (twice the height of the gusset portion 4 of 40 mm), and the inner end of the bottom. The inclined part from the part to the height position of 80 mm on the side part of the bag was provided in a pattern inclined linearly.
The bottom laminated film cutouts 3a, 3b, 3c, 3d provided at the bottom of the bottom laminated film inserted inside the gusset part 4 are the cutouts 3a, 3c provided at both ends. As shown in FIG. 1, it is provided in a vertically long semi-elliptical shape, and the notches 3b and 3d are positions where the end on the center side becomes a length of 50 mm from the ends on both sides toward the center. In a semicircular shape.
The edge portions on both sides of the laminated films 1 and 1 'on the wall surface above the upper ends of the heat seal portions 6a and 6b on both sides of the ship bottom-shaped seal pattern are side seal portions 8a having a width of 6 mm up to the upper end of the bag 100. 8b was used to produce a self-supporting bag of Example 1.

  In the structure of the self-supporting bag of Example 1, the outer dimension of the bag was increased by 20 mm to 200 mm, the length was reduced by 15 mm to 155 mm, and the lateral shape was further increased. Appropriate to the horizontal length of the heat seal part 5 having a low height at the center of the bottom seal pattern, this length is set to 90 mm, and the length of the bag is reduced by 15 mm is the edge on both sides of the bag A self-supporting bag of Example 2 was manufactured in the same manner as in Example 1 except that the length of the side seal parts 8a and 8b was reduced by 15 mm.

  Regarding the self-supporting bags of Examples 1 and 2 produced as described above, particularly whether or not the spread of the bag in the front and rear is kept large even when the contents filled in the bag are reduced. Therefore, once the confections individually packed as contents from the upper mouth portion were sufficiently packed in each free standing bag, and then sequentially removed, the contents in both the free standing bags of Examples 1 and 2 were mostly Even when it disappeared, it was confirmed that the opening at the mouth of the bag was kept large and the contents could be easily taken out to the end.

  The self-supporting bag of the present invention is a self-supporting bag made of a laminated film in which the bottom portion of the bag is formed in a gusset form to provide self-supporting properties. When taking out the contents of the bag, just cut and open the top seal part of the bag, it automatically opens the mouth of the bag and makes it easy to take out the contents. A large opening is retained even when the amount of the material is reduced, and the contents can be easily taken out to the end and can be used as a substitute for tableware. There is no particular limitation.

It is a front view which shows the structure of the 1st Example of the self-supporting bag of this invention. It is a front view which shows the structure of the 2nd Example of the self-supporting bag of this invention. It is a figure explaining the expansion shape of the conventional self-supporting bag, (A) is a top view of a self-supporting bag, (B) is a front view of the self-supporting bag, and (C) is a bottom view of the self-supporting bag. It is a figure explaining the spreading shape of the self-supporting bag of this invention, (A) is a top view of a self-supporting bag, (B) is a front view of a self-supporting bag, and (C) is a bottom view of the self-supporting bag.

Explanation of symbols

1, 1 'Laminated film on the wall 2 Laminated film folded part on the bottom (upper end of gusset part)
3a, 3b, 3c, 3d Laminated film notch on the bottom 4 Gusset part 5 Low heat seal part 6a, 6b From the end of the low heat seal part to the upper end of the gusset part heat-sealed portion 7a gradually becomes higher shape toward the side of the bag, 7b unsealed portions 8a, 8b side seal portion 9a, and 9b bag closure region 10 bottom seal portion h ₁ of the gusset portion height h ₂ high The height of the heat seal part that gradually increases from the end of the low heat seal part beyond the upper end of the gusset part toward the side of the bag at a higher position w Wrinkles before and after the lower part of the gusset part Length in width direction where parts are bonded 100, 200 Free standing bag

Claims (3)

The body of the bag is formed by heat-sealing the edge portions on both sides of the laminated film on the front and back wall surfaces, and the bottom of the bag is formed in a form having a gusset portion formed by folding the laminated film, and the gusset portion is at the center In a self-supporting bag formed by heat-sealing with a bottom-bottom seal pattern in which the bottom portion is low and both sides gradually rise toward the side of the bag, the bottom-bottom seal pattern has a height at the center of the gusset portion. a low heat seal portion of is, gradually becomes higher shape from both sides of the lower heat-sealed portion of the height of the central portion over the sides of the bag higher position over the upper end of the gusset portion of the gusset portion is formed by the heat seal portion, to adhere the inner faces of both side edges of the folds of the front and rear of the gusset portion, the adhesion portion for the entire folds front and rear to prevent the opening back and forth, The height of the central part of the gusset part Provided each along the bottom of the gusset from the lower sides of the heat seal portion of the region of the heat-sealed portion gradually becomes higher shape toward the side of the bag higher position over the upper end of the gusset portion It is Rutotomoni, self-standing bag the distance from the lower side edge of the gusset portion to the adhesive section, and being provided so as to be a length corresponding to a folding height of at least gusset portion.   The heat seal part having a shape that gradually increases from both sides of the heat seal part having a low height at the center of the gusset part toward the side part of the bag at a higher position beyond the upper end of the gusset part, The self-supporting bag according to claim 1, wherein the bag is formed in a shape that gradually increases toward the side portion of the bag at a height that is at least twice the height of the gusset portion.   The outer shape of the self-supporting bag is a rectangular shape, and the ratio of the length and the length of the self-standing bag is in the range of 0.8 to 2 in width to 1 in length. Self-supporting bag.

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