JP2006264698A - Packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag capable of smoothly and adequately hanging/lowering and storing the packaging bag from/into a box by suppressing the expansion of the width of a lower end to the width of a center portion to be smaller under the hanging posture of a three-way sealed packaging bag with an object to be filled and packaged therein. <P>SOLUTION: In the three-way sealed flexible packaging bag 4 having respectively seal parts 1 and 2 in a bottom part and both side parts, one projecting part 7 of a triangular ridge shape which is projecting to a filling space 6 side of the article to be packaged is formed on the bottom seal part 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a packaging bag formed by sealing a sealant layer of a packaging film, which has a single layer or a laminated structure of a plastic film, and may include an intermediate layer such as paper and aluminum foil, by heat sealing or the like, In particular, we propose a technology to keep the width of the lower end of the packaging bag sufficiently small relative to the width of the center of the packaging bag under the hanging posture of the packaging bag after it has been filled and packed with liquids. To do.

  A packaging structure has been proposed in which a soft packaging bag formed by filling and packaging a predetermined amount of an object to be packaged is stored in a box made of paper, hard plastic, etc., thereby imparting a formability to the packaging bag. According to this, there is an advantage that the box body and the flexible packaging bag can be easily and easily separated from each other after the packaged goods are consumed, particularly when the box body is recycled.

However, in order to realize such a packaging structure, when a packaging bag filled with a package is packed in a box of a predetermined volume assembled in advance, the packaging bag is The body is hung from the bottom side to the inside through the upper end opening having a predetermined opening size, but the packaging bag filled and packed with the package is usually packaged under the hanging posture. Under the influence of the weight of the product, the width of its lower end is considerably wider than that of the central part in the vertical direction of the packaging bag. When hanging down into a box having a predetermined volume as close as possible, the bottom of the packaging bag interferes with the opening edge of the box, preventing the packaging bag from being smoothly suspended in the box. On the other hand, the interference as described above once After that, even if it becomes possible to hang the packaging bag in the box, an unintended folded part will occur near the bottom of the packaging bag, and the package will be contained on the bottom side of the folded part. Therefore, there is another problem that it is difficult to completely dispense the packaged items in the bag.
And such a widening amount of the lower end portion of the packaging bag is when the packaging bag is of a side seal type, a two- or three-way seal type, an envelope type or other flat shape that can be manufactured at a low cost with a simple structure. There was a tendency to be larger than those of three-dimensional shapes such as pleated shapes, flat bottom shapes, and square bottom shapes.

  The present invention has been made in order to solve such problems, and the object of the present invention is to provide a packaging bag in which an object to be packaged such as a liquid is filled and packaged, for example, under evacuation, Even in the hanging position, the amount of widening of the width of the lower part relative to the width of the central part should be kept sufficiently small so that the packaging bag can be suspended and stored in the box body smoothly and properly at all times. There is in providing packaging bags.

The packaging bag according to the present invention has a single layer or laminated structure of a plastic film, and seals the sealant layer of the packaging film which may include an intermediate layer such as paper or aluminum foil by heat sealing or the like, and the bottom and both sides. A soft packaging bag provided with a seal portion on each of the portions, and having one or more protrusions protruding on the filling space side of the package, that is, the inside of the packaging bag, on the bottom seal portion It is.
Here, the bottom seal portion refers to the seal portion of the portion that becomes the bottom in the distribution process of the packaged article. Therefore, the bottom seal portion may be a top seal portion in the filling and packaging process of the packaged items.

By the way, the contour shape of the protrusion can be a triangular mountain shape, a trapezoidal shape, or an arc or other curved shape in a side view, and the number of the protrusions is the same as the inner width dimension of the packaging bag. Under the relation, for example, it may be about two or three at regular intervals.
In this case, the base width of the triangular mountain-shaped protrusion is 8.7 to 43.7% of the inner width of the bag, for example, 10 to 50 mm, and the height is the inner method of the bag after sealing the top opening. The length is preferably 1.7 to 8.6%, for example, 5 to 25 mm.

  The total bottom width of the protrusions in the trapezoidal shape is 52.2 to 87% of the inner width of the bag, for example, 60 to 100 mm. The total upper width is 17.4 to the inner width of the inner wall. 52.2%, for example 20-60 mm, and each height is preferably 1.7-8.6% of the inner length of the bag after sealing the top opening, for example, 5-25 mm. .

Here, preferably, a non-return dispensing nozzle having a sealed tip that protrudes laterally from one side seal portion is provided at the upper end portion.
The non-return dispensing nozzle can be formed integrally with the packaging bag, or can be attached to the packaging bag. Moreover, the upper end part here says the part used as the upper end part of a packaging bag in the process of distribution | circulation and consumption of a to-be-packaged item.

In such a packaging bag, more preferably, the packaging bag is filled with an object to be packaged and the top opening of the packaging bag is tightly sealed by the top tool, and the hanging position at the top seal portion is within the lower end of the packaging bag. The modulus width is set to 1.21 times or less, preferably 1.11 times or less, with respect to the inner modulus width of the central portion (middle) in the length direction, that is, the vertical direction.
And preferably, in the same hanging posture, the outer width of the lower end of the packaging bag is set to 1.16 times or less, preferably 1.03 times or less, relative to the outer width of the central portion thereof. .

According to the present invention in which at least one protrusion is formed on the bottom seal portion of the packaging bag, the protrusion formation portion of the bottom seal portion is to be packaged in the hanging posture of the packaging bag filled and packaged with the package. As a result, the inner and outer widths of the lower end of the package can be effectively narrowed compared to conventional packaging bags that do not form protrusions. Can be
Therefore, when the packaging bag filled and packaged is suspended from the top opening of the box into the box, the bottom of the packaging bag, especially the side of the packaging bag, and the interference between the box opening edge As a result, the packaging bag can be suspended and stored in the box smoothly and appropriately, so that the predetermined hanging operation can be performed smoothly and efficiently. It is possible to effectively prevent the occurrence of unexpected bent portions in the packaging bag.

For such hanging storage of the packaging bag, for example, a truncated pyramid-shaped guide means is disposed above the upper end opening of the box body, and the box on the lower end portion of the packaging bag is provided by the inner surface of the guide means. This is more reliably performed when guiding the entry into the body opening in an appropriate posture.
In this case, the contour shape of the protrusions and the number of formations can be appropriately selected as necessary, but the shape can be a triangular mountain shape, a trapezoidal shape, or a curved shape in a side view, This is preferable for smoothly inducing the depression deformation as described above of the bottom seal portion of the packaging bag and ensuring a large depression deformation amount.

  The number of protrusions is related to the dimensions of the protrusions themselves, the inner width of the packaging bag, etc. In order to increase the efficiency, it is preferable that the number is about two or three.

  By the way, in the case of providing a triangular mountain-shaped protrusion, in order to make the depression deformation at each protrusion sufficiently large and to suppress the amount of widening at the lower end of the packaging bag, the bottom width of the protrusion is reduced. , And the height is in the range of 8.7 to 43.7% of the inner width of the bag, and the height is in the range of 1.7 to 8.6% of the inner length of the bag after sealing the top opening. It is preferable.

  Within this range, if the triangular mountain-shaped protrusion is formed, the protruding portion of the bottom seal portion is placed on the filling space side of the package in the suspended posture of the packaging bag filled with the package. You will be able to dent larger.

  On the other hand, when the trapezoidal protrusion is provided, for the same reason, the total bottom width of the protrusion is in the range of 52.2 to 87% of the inner width of the bag, and the total top bottom width. In the range of 17.4 to 52.2% of the inner width, and each height is in the range of 1.7 to 8.6% of the inner length of the bag after sealing the top opening. It is preferable to do.

  The reason for this is the same as that for forming a triangular mountain-shaped protrusion, and it is an effective range for reducing the amount of widening at the lower end of the packaging bag by increasing the amount of depression deformation of the bottom seal portion. be able to.

In any of the packaging bags as described above, when a non-return dispensing nozzle with a sealed tip that protrudes from one side seal portion to the side is provided at the upper end portion, for example, liquid packaging The package can be poured out from the packaging bag filled and packaged under deflation by tilting the packaging bag with the end sealing part of the non-return dispensing nozzle cut off. After the end of the pouring, the outside air, dust and the like entered the packaging bag by interposing the thin film of the packaged object of the pouring nozzle by returning the packaging bag to the original standing posture. It can be sufficiently blocked based on the channel closing action.
Therefore, in this case, it is effective to effectively prevent the articles to be packaged remaining in the packaging bag from being oxidized by the air that has entered the bag or being contaminated by dust, fungi, or the like that has entered the bag. Can do.

Here, the specific configuration and operation of this non-return dispensing nozzle are disclosed in Japanese Patent Application Nos. 2003-185459, 2003-28391, and Japanese Patent Application No. 2004-224041. One pouring nozzle disclosed in 2004-224041 has a base end portion fused and bonded to the inner surface of the packaging bag body by an outermost sealant layer at the side or top of the flexible packaging bag body. Each of the front and back laminated films comprising the uniaxial or biaxially stretched base film layer and the respective sealant layers laminated with the uniaxially or biaxially stretched base film layer in the mutually opposing posture of one sealant layer. It has a structure in which the peripheral portions excluding the sides are fused to each other.
In addition, the other pouring nozzle is configured integrally with the side or top of the soft packaging bag body so as to protrude from the uniaxial or biaxially stretched base film layer and one of the base film layers. The laminated films on the front and back, each having a sealant layer laminated on the front side, are fused to each other at the peripheral portion of the protruding portion from the packaging bag body in the mutually facing posture of the sealant layer.
In any of these dispensing nozzles, the uniaxial or biaxially stretched base film layer is preferably composed of a polyethylene terephthalate film layer or a nylon resin film layer having a thickness of 8 to 30 μm. It is preferable that the film is composed of an unstretched polyethylene layer or a polypropylene layer having a thickness of 10 to 60 μm.
In addition, the water vapor permeability (JIS K7129) of the uniaxial or biaxially stretched base film layer is 10 g / (m ² · 24 h) or less, and the bending strength per unit width (15 mm) of the laminated film is 40 to Suppose that it is preferable to set it as 300 mN.

And, regarding the operation of such a non-return dispensing nozzle, “the dispensing of the packaged material in the use, consumption, etc. of the in-bag packaging filled and packaged in the packaging bag provided with it is the dispensing nozzle. However, when it becomes a film with a layer structure of two or more layers, it is different from a film with a layer structure of three or more layers, and the tip of the nozzle is poured into the nozzle by removing the fused portion at the tip of the film by tearing and cutting with fingers. The outlet can be formed, and then the packaging bag can be tilted so that the outlet of the nozzle faces downward, in which case the outlet nozzle made of a soft laminated film is Under the action of the water head pressure of the object, it is separated from the front and back sides and the tip spout is opened to allow the dispensing of the packaged items as required.
When the packaged item is dispensed in this way, the flexible packaging bag body shrinks or collapses by the amount corresponding to the dispensed volume without sucking outside air as the packaged item is dispensed. Will be transformed.
After the required amount of the package is poured out by tilting the packaging bag, the packaging bag is returned to the original standing position to stop the pouring, and based on the stoppage of the pouring, the package is wetted. In addition, the inner surface of the inner surface of the inner surface of the inner surface of the object to be packaged is stopped, and at the same time as it stops, the nozzle extends across the width direction of the film on the front and back of the pouring nozzle, in other words, the entire vertical direction. The tip spout is sealed to prevent the outside air from entering the packaging bag.
Therefore, in the packaging bag having the dispensing nozzle, the packaged items in the bag are sufficiently protected from contact with the outside air during and after the dispensing as well as before the dispensing of the packaged items. Thus, oxidation, fouling and the like of the packaged items in the bag are effectively prevented.
By the way, such close contact of the film on the front and back of the pouring nozzle here, in addition to returning the pouring nozzle to the original shape at the time of manufacture by releasing the pouring nozzle from the action of the hydraulic head pressure by the standing return of the packaging bag, When the packaged item in the dispensing nozzle returns to the inside of the packaging bag body, the inner surfaces of the front and back films wetted by the packaged item are automatically exposed to each other by being exposed to a reduced-pressure atmosphere. Such close contact is caused by the fact that the packaging bag body that has been shrunk or crushed and deformed as the article to be packaged from the packaging bag is poured into the interior of the packaging bag based on its inherent elastic restoring force. This is more certain when the pressure is reduced.
Thus, without special operation for the dispensing nozzle, it is possible to automatically close and seal the tip outlet of the packaging bag together with the rising and returning of the packaging bag. Can be demonstrated. "

  By the way, when the packaging bag as described above is seen in the packed state of the article to be packaged, the inner width of the lower end of the packaging bag is set to the upper and lower sides of the packaging bag under the posture in which the packaging bag is suspended by the top seal portion. If the width of the lower end of the packaging bag is sufficiently reduced to be 1.21 times or less than the inner width of the central portion in the direction, the inside of the box having the upper end opening size that is smaller than the allowable limit. The packaging bag can be suspended and accommodated sufficiently smoothly and appropriately without interference with the box opening at the inner side of the side seal portion of the packaging bag.

In other words, even if the side seal part and the box opening may interfere with each other, when the packaging bag is suspended, the interference is canceled by the effect of the weight of the packaging bag on the interference part. By doing so, the smoothness of the packaging bag entering the box can be ensured.
In this case, even if the side seal part is bent at the time of releasing the interference, the side seal part is not filled with an article to be packaged. There is no problem of containment.

  On the other hand, when the outer width of the lower end of the packaging bag filled and packaged with the article to be packaged is 1.16 times or less than the outer width at the center of the bag, Alternatively, the packaging bag can be suspended and stored more smoothly in the box while the width of the side seal portion is reduced.

  FIG. 1 is a side view showing an embodiment of the present invention in a state in which a top seal portion is also formed. This packaging bag has a sealant layer of a plastic film having a single layer or a laminated structure, for example, heat sealing, The bottom seal part 1 and the side seal part 2 are respectively formed as shown by hatching in the figure, and sealed at the upper end part by sealing with a high frequency seal, an impulse seal or the like. A non-return dispensing nozzle 3 protruding sideways from the side seal portion 2 is provided.

  Here, as described above, the non-return dispensing nozzle 3 whose tip is sealed comprises at least a uniaxial or biaxially stretched base film layer and respective sealant layers laminated with the uniaxial or biaxially stretched base film layer interposed therebetween. Each laminated film of the three-layer structure is constructed by fusing each other in the peripheral portion except the base end side in the mutually facing posture of one sealant layer. In forming the side seal portion 2, a part of the packaging bag is configured by fusing the inner surface sealant layer of the side seal portion to the outer surface sealant layer of the check dispensing nozzle 3.

  The packaging bag 4 having a flat shape configured in this way is preferably filled with a predetermined amount of an article to be packaged from the top opening of the packaging bag 4 and then the top portion of the packaging bag 4 is preferably in a state where the gas in the bag is evacuated. The top seal portion 5 that provides a hermetic seal of the opening is formed by heat sealing or other sealing methods.

And in this invention, for example, in such a packaging bag 4 in which the heat seal width of each of the bottom part, the top part and both side parts is 10 mm, and the inner width and the inner length can be 115 mm and 290 mm, respectively. In the central portion of the bottom seal portion 1, a single projection 7 having a triangular mountain-like contour shape that protrudes toward the filling space 6 of the package is formed, and the dimensions of the projection 7 are preferably It is assumed that the width is in the range of 8.7 to 43.7% of the inner modulus width and the height is in the range of 1.7 to 8.6% of the inner modulus length.
More specifically, in the packaging bag 4 having the above dimensions, it is preferable that the base width is 15 to 25 mm and the height is 10 to 20 mm.

FIG. 2 is a view showing another example of forming triangular protrusions on the bottom seal portion 1, and the one shown in FIG. 2A is composed of two protrusions 7 having the same dimensions. The package bag is formed in three equal positions of the inner width.
In FIG. 2B, protrusions 7 having the same dimensions are formed at quarter positions of the normal width in the packaging bag, and the structure shown in FIG. The tops of the individual mountain-shaped protrusions 7 are formed in an arc shape.

FIG. 3 is a diagram illustrating an example in which a trapezoidal protrusion is formed on the bottom seal portion. Here, in the example shown in FIG. 3A, one trapezoidal protrusion 8 is formed at the center of the bottom seal portion 1, and the side seal portion shown in FIG. 2 shows an example in which two odd-shaped protrusions 9 are formed at positions of both end portions of the bottom seal portion 1 adjacent to each other.
When one or a plurality of trapezoidal protrusions 8 and 9 are formed, the total bottom width of the protrusions 8 and 9 is in the range of 52.2 to 87% of the inner width of the bag. The total width of the upper base is in the range of 17.4 to 52.2% of the inner width, and each height is 1.7 to 8.6% of the inner length of the bag. More specifically, under the above-described bag dimensions, the total bottom width is 60 to 80 mm, the total top bottom width is 40 to 60 mm, and the height is 10 to 20 mm. preferable.

  Furthermore, the contour shape of the protrusion may have a curved shape as illustrated in FIG. 4 (a), 4 (b), and 4 (c) are examples of forming the protrusion 10 having an arcuate contour shape whose dimensions and number are appropriately selected, and those shown in FIG. FIG. 4E shows an example of the shape of the protrusion 12 having an elliptical contour shape, and FIG. 4E.

  The package structure of the packaging bag is a laminated structure of a 15 μm-thick biaxially stretched nylon film layer with a transparent vapor deposition film and a 40 μm-thick polyethylene sealant layer, and is a flat package with a non-return dispensing nozzle When the inner width of the bag is 115 mm, the outer width is 135 mm, the inner length is 290 mm, and the outer length is 310 mm, 750 ml of water is filled in the packaging bag and sealed. When the packaging bag is suspended and supported through two through holes drilled in the part, the inner and outer method widths at the central portion in the vertical direction of the packaging bag and the inner and outer method widths at the lower end portion of the packaging bag, respectively Was measured for each of the example bag in which the bottom seal part was not provided with a protrusion facing the inside of the filling space and the example bag in which the shape, size, and number of the formed protrusions were changed. 7 (subordinate Results) as shown in FIG. 8 (Example bag).

  Here, various method dimensions under the condition of being packed and packaged with an article (water) to be packaged were measured as shown in FIG. In this case, the center position in the vertical direction of the packaging bag should be marked at a position half of the inner length of the flat packaging bag before filling and packaging the package, with the width of the top seal portion expected in advance. Identified by applying. In addition, the inner dimension of the packaging bag center part (middle abdomen) under the condition of filling and packaging with water was 85.0 mm, and the outer dimension was 105.0 mm.

  As can be seen from the results shown in FIG. 8, all the example bags suitable for the present invention in which the protrusions are formed on the bottom seal part have both inner and outer dimensions at the lower end compared to the conventional bag shown in FIG. 7. In addition to being able to greatly reduce it, the amount of widening of the dimension relative to the inner and outer dimensions of the central part could be reduced. That is, in the conventional bag shown in FIG. 7, the inner width of the lower end of the packaging bag is about 1.21 times as large as the inner width of the central portion in the longitudinal direction, that is, in the vertical direction. On the other hand, it was about 1.16 times, but in the example bag conforming to the present invention, even the No. 7 which is the worst example (an example with a large amount of widening) is 1 in the internal width. It was confirmed that it was effective for suspending and storing the filling and packaging bag in a box body.

Therefore, according to these embodiment bags in which a protrusion is formed on the bottom seal portion, for example, when the packaging bag is suspended and stored in a box whose inner dimension of the upper end opening is 100 × 100 (mm). Even if the lower end of the side seal part interferes with the opening edge of the box body, it can be carried out smoothly and properly, which means that the side seal part of the packaging bag When the storage is suspended and stored in the diagonal direction, the same applies even if the internal dimension of the opening is reduced to 70 × 70 (mm).
In the latter case where the packaging bag is suspended in a diagonal direction, the inner size of the upper end opening of the box is reduced to 65 × 65 (mm) in the packaging bags of Example bags 2 to 6 and 8. In addition, it is possible to realize smooth and proper hanging storage.

  By the way, when the packaging bag is suspended and stored in the box body, as illustrated in FIG. 6, for example, a hanging quadrangular pyramid-shaped suspension guide surface is provided above the upper end opening 22 of the box body 21. The guide means 23 is positioned and arranged, and the guide means 23 guides the lowering of the packaging bag to a predetermined position, so that the packaging bag can be stored in the box more smoothly. This is particularly effective in a packaging bag having an outer dimension in which the lower end of the side seal portion 2 interferes with the upper end opening edge of the box body 21.

In the case of a packaging bag in which the outer dimension of the side seal portion 2 is larger than the inner dimension of the upper end opening 22, the side having the lowest bending rigidity is measured while the packaging bag slides down on the guide surface of the guide means 23. In the part seal part 2 or at the boundary part between the side seal part 2 and the filling space of the article to be packaged, it is bent and deformed to be corrected to a size that can enter the upper end opening 22. Because of such bending deformation, the package is not contained between the bent deformation portion and the bottom and side seals, so that the entire amount of the packaged item in the bag is completely removed. It is possible to sufficiently secure the exit.
On the other hand, if the inner size of the lower end of the packaging bag is larger than that of the opening of the box, the packaging bag can be stored in the box under the action of the guide means 23. Even in this case, since one or more folding parts are generated in the filling space of the packaged item, the packaged item in the bag between the bent deformation part and the seal part is formed. The occurrence of containment that cannot be poured out is unavoidable.

It is a side view which shows embodiment of this invention in the state which also formed the top seal part. It is a side view which shows other embodiment. It is a side view which shows other embodiment. It is a side view which shows other embodiment. It is explanatory drawing which shows the measurement aspect of an inner-law dimension and an outer-law dimension. It is a principal part perspective view which illustrates the usage condition of a guide means. It is explanatory drawing which shows the form of the lower half part of the conventional bag in an Example. It is explanatory drawing which shows the form of the lower half part of the Example bag in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bottom part seal part 2 Side part seal part 3 Non-return pouring nozzle 4 Packaging bag 5 Top part seal part 6 Package filling space 7, 8, 9, 10, 11, 12 Projection part 21 Box body 22 Upper end opening 23 Guide means

Claims (8)

A soft packaging bag having a seal portion on each of the bottom and both sides,
A packaging bag in which one or more protrusions that protrude toward the filling space side of an object to be packaged are formed on the bottom seal portion.   The packaging bag according to claim 1, wherein the contour shape of the protrusion is a triangular mountain shape, a trapezoidal shape, or a curved shape in a side view.   The packaging bag according to claim 1 or 2, wherein the number of protrusions is two or three.   The bottom width of the triangular mountain-shaped protrusion is 8.7 to 43.7% of the inner width of the bag, the height is 1.7 to 8.8 of the inner length of the bag after sealing the top opening. The packaging bag according to any one of claims 1 to 3, wherein the packaging bag is 6%.   The total bottom bottom width of the trapezoidal protrusion is 52.2 to 87% of the inner width of the bag, and the total upper base width is 17.4 to 52.2% of the inner width. The packaging bag according to any one of claims 1 to 3, wherein each height is set to 1.7 to 8.6% of an inner length of the bag after sealing the top opening.   The packaging bag according to any one of claims 1 to 5, wherein a non-return dispensing nozzle having a sealed tip is provided on the upper end portion so as to protrude laterally from one side seal portion.   Fill the packaged item and seal the top opening of the packaging bag in a suspended position at the top seal, and the inner width of the lower end of the packaging bag is set to the inner width at the center of the bag. The packaging bag according to any one of claims 1 to 6, which is 1.21 times or less. Fill the packaged item and close the top opening of the packaging bag. In the hanging position at the top seal, the outer width of the lower end of the packaging bag is set to the outer width at the center of the bag. The packaging bag according to any one of claims 1 to 7, which is 1.16 times or less.

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