JP5907702B2 - Packaging bag with spout - Google Patents

Description

  The present invention relates to a packaging bag with a spout in which an unsealed portion serving as a flow path for a spout is provided at an upper corner of the packaging bag.

A packaging bag provided with a spout is widely used, for example, in a packaging bag (pouch) for storing contents for refilling in order to facilitate the pouring of the contents.
In addition, in the spout part of this type of pouch, as an easy-opening means, an upper notch, a half-cut line by laser light irradiation that crosses the flow path, and a tear from the notch to the end of the half-cut line In combination with the perforation line, after starting to tear downward from the upper notch, it is provided so that the opening direction bends obliquely upward along the flow path near the base of the spout (see, for example, Patent Document 1) ).

JP 2006-273338 A

  However, although the spout can be easily opened by means of easy-opening means, if there is not much difference in tear strength from the notch to the half-cut line, the tear direction should be changed diagonally upward. The direction cannot be changed at the location, and tearing proceeds downward to the lower part of the spout as it is or further to the lower trunk body, and there is a possibility that it cannot be opened correctly.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the packaging bag with a spout which can suppress the tearing to the lower part of a spout and the trunk | drum main body.

In order to solve the above-described problem, the present invention provides a packaging bag in which an unsealed portion serving as a flow path for a spout is provided at an upper corner of the packaging bag, the sealing portion above the unsealed portion As an opening assisting line for initiating opening, it extends downward from the upper side of the packaging bag toward the flow path, changes direction near the flow path and extends obliquely upward along the flow path, Further, the opening auxiliary line having a planar shape extending toward the opening start side end of the opening guide line by changing the direction is provided, and among the opening auxiliary lines, downward from the upper side toward the flow path The corner portion that changes direction between the first portion extended and the second portion extended obliquely upward along the flow path is further away from the spout than the first portion. A packaging bag with a spout is provided, which has a protruding portion that is bent and protrudes.
Preferably, the corner portion has an arc shape, and a width of the corner portion protruding from an extension line of the first portion is not less than ½ times the radius of the arc of the corner portion.
The angle at which the start side of the corner portion is bent from the end side of the first portion is preferably 90 to 120 °.
It is preferable that the angle formed by the direction of the start side of the corner portion bent from the end side of the first portion with respect to the direction perpendicular to the upper side of the packaging bag is 90 to 120 °.
It is preferable that the opening assist line is a cut line having a non-penetrating portion in the first portion, and the entire corner portion is formed by a penetrating portion penetrating a plurality of films constituting the spout. .

  According to the present invention, the tear strength when tearing downward at the location where the direction of tearing should be changed diagonally upward becomes stronger than the tear strength of the half-cut line, so that the tearing to the lower part of the spout or the trunk body is prevented. It can be effectively prevented.

It is a top view which shows one example of a packaging bag with a spout of this invention. It is the elements on larger scale which show (a) vicinity of a spout of the packaging bag with a spout of FIG. 1, and (b) corner vicinity of the opening assistance line. It is the elements on larger scale which show the (a) vicinity of a spout of the packaging bag with a spout of the modification of this invention, and the corner part vicinity of the (b) opening assistance line. It is the elements on larger scale which show the (a) spout vicinity of the packaging bag with a spout of a comparative example, and the corner part vicinity of (b) opening assistance line. It is a top view which shows a mode that the method of measuring the tear strength to the lower part of a spout and a trunk | drum main body was applied to the packaging bag with a spout of an Example. It is a top view which shows a mode that the method of measuring the tear strength to the lower part of a spout and a trunk | drum main body was applied to the packaging bag with a spout of a comparative example.

The present invention will be described below based on preferred embodiments with reference to the drawings.
As shown in FIG. 1, a packaging bag 10 according to this embodiment includes two body films 11 and 11 having the same planar shape, and a bottom film 12 folded in two with a folding line 12a as a center line. It is a standing pouch composed of As shown in FIG. 1, the bottom film 12 is folded between the lower portions of the pair of body films 11 and 11 so that the fold line 12a is inward.
The packaging bag 10 is formed with side end seal portions 11a and 11b along the left and right side edges, respectively, and the body film 11 and 11 and the bottom film 12 are connected to each other at the lower portion of the packaging bag 10. The bottom seal portion 12b is formed by heat-sealing between the lower end edges of the opposing surfaces.

  As films used as the body film 11 and the bottom film 12, those conventionally used, for example, films made of biaxially stretched polypropylene, biaxially stretched polyamide, biaxially stretched polyester, etc. are used as base films, and these films A laminate in which a polyolefin resin such as low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, and polypropylene is laminated as a sealant layer on a base film is used. Examples of the method for producing the laminated film include a dry laminating method, an extrusion laminating method, and a coextrusion method. An adhesive or an anchoring agent can be provided between the base film layer and the sealant layer in order to improve the adhesive strength. In this case, a plurality of substrate films may be laminated in order to increase the strength of the packaging bag. Alternatively, a metal foil such as an aluminum foil, a metal vapor-deposited layer, an inorganic vapor-deposited layer such as ceramic, an ethylene-vinyl alcohol copolymer film, or the like may be laminated in order to improve the barrier property against gas or ultraviolet rays.

Although the dimension of the packaging bag 10 is not specifically limited, As a suitable range as a container for refilling, the height of the packaging bag 10 is about 100 to 500 mm, the width of the packaging bag 10 (the maximum width between both ends) ) Is about 70 to 300 mm, and the filling amount of the contents is about 100 to 5000 cm ³ .
The contents are not particularly limited, and examples thereof include liquids, solids such as powders and granules, viscous bodies, liquids, and mixtures thereof.

As shown in FIGS. 1 and 2 (a), an unsealed portion 15 serving as a flow path for the spout 14 is provided between the upper corner of the packaging bag 10, that is, between the upper side 14a and the side end 14b. It is provided so that it may face diagonally upward.
In the case of this embodiment, the spout 14 includes flow path forming seal portions 15a and 15b that constitute both sides of the flow path after opening, a flow path sealing seal portion 15c that seals the flow path before opening, and being opened. A pull tab 16 serving as a knob is formed by heat-sealing the body films 11 and 11 continuously from the upper part of the side end seal part 11b.

The flow path forming seal portions 15a and 15b define both sides of the flow path when the front end portion of the spout 14 is removed and the flow path is opened. That is, the unsealed part 15 between one flow path forming seal part 15a and the other flow path forming seal part 15b becomes a flow path.
One flow path forming seal portion 15a is provided above the unsealed portion 15 (between the upper side 14a), and the other flow path forming seal portion 15b is located on the side of the unsealed portion 15 (with the side end 14b). Between).
The front end portion of the unsealed portion 15 is closed by the flow path sealing seal portion 15c. A seal portion 13 is formed between the flow path forming seal portion 15a and the side end seal portion 11a, but it can be used as a filling port before the seal portion 13 is closed. The seal part 13 is formed by heat-sealing the body film 11, 11 at the periphery of the filling port after filling the contents.

  In order to facilitate opening, the spout 14 is provided with an opening guide line 18 made of, for example, a half cut line formed by a laser so as to cross the unsealed portion 15 serving as a flow path. The opening guide line 18 is preferably provided on each of the two body films 11 and 11 including the spout 14.

An opening assist line 17 for starting opening is provided on the seal portion 14c above the unsealed portion 15 serving as a flow path (between the upper side 14a). The opening assisting line 17 extends downward from the upper side 14a toward the flow path, extends perpendicularly to the upper side 14a, changes direction near the flow path, and extends obliquely upward along the flow path. It has a planar shape extending toward the opening 18a on the opening start side of the opening guide line 18 by changing the direction.
The sealing portion 14c above the unsealed portion 15 can be cut off by the opening assist line 17 while leaving a flow path forming seal portion 15a having a predetermined width between the unsealed portion 15 and the unsealed portion 15. The portion where the opening assisting line 17 extends along the flow path is a spout that protrudes after opening while ensuring the seal width of the flow path forming seal part 15a between the unsealed part 15 and the opening assisting line 17. Is formed in the vicinity of the unsealed portion 15.
In addition, a notch 17n made of, for example, a V-shaped notch is provided at a position where the opening assist line 17 starts at the upper side 14a.

Corner portion provided at a location where the direction is changed from the first portion 17a extending downward from the upper side 14a of the opening assisting line 17 to the second portion 17b extending obliquely upward along the flow path. 17c has the protrusion part 17d which bends and protrudes so that it may distance from the spout 14 rather than the 1st part 17a. That is, in FIG. 1, the corner part 17c protrudes rightward, contrary to the spout 14 being provided in the left side of the 1st part 17a.
As a result, the force of going straight downward from the upper side 14a is dispersed, and the extension of the first portion 17a makes it difficult to tear down as it is, effectively preventing tearing to the lower part of the spout and the trunk body. it can.
The shape of the corner portion 17c may be formed in a substantially semicircular shape, a V shape, a U shape, or the like in addition to an arc shape as in the illustrated example. Moreover, the magnitude | size can be set suitably.

  The corner portion 17c has an arc shape, and the width of the corner portion 17c protruding from the extension line of the first portion 17a is preferably not less than ½ times the radius R of the arc of the corner portion 17c. Further, from the viewpoint that the force when opening the first portion 17a is likely to act in the direction along the first portion 17a, the angle at which the start side of the corner portion 17c bends from the end side of the first portion 17a. Is preferably 90 to 120 °. Moreover, from the viewpoint that the force for opening the first portion 17a is likely to act in a direction perpendicular to the upper side 14a of the packaging bag, the start side of the corner portion 17c that is bent from the end side of the first portion 17a. Is preferably 90 to 120 ° with respect to the direction perpendicular to the upper side 14a of the packaging bag.

For example, in the example shown in FIG. 2, the width D ₁ of the arc-shaped corner portion 17c projects from the extension of the first portion 17a is equal to the radius R of the circular arc of the corner portion 17c (1 times the arc radius R Is). In this case, the angle theta ₁ which the originator of the corner portion 17c is bent from the end side of the first portion 17a, is approximately 90 °.
Further, in the example shown in FIG. 3, the width D ₂ of arcuate corner portion 17c projects from the extension of the first portion 17a is 1/2 times the radius R of the circular arc of the corner portion 17c. In this case, the angle theta ₂ which the start side of the corner portion 17c is bent from the end side of the first portion 17a, of about 120 °.
When the corner portion 17c is a curve, the bending angle from the first portion 17a can be obtained as a tangential direction at the intersection P between the first portion 17a and the corner portion 17c.

The opening assisting line 17 can be constituted by a cut line having a non-penetrating part (joint) 17j in a first part 17a extending downward from the upper side 14a of the opening assisting line 17. In this case, it is preferable that the entire corner portion 17c is formed by a penetrating portion that penetrates a plurality of films (in the present embodiment, the two body portion films 11 and 11) constituting the spout. Thereby, it becomes difficult to tear downward from the corner portion 17c, and after the momentum of the force after tearing the non-penetrating portion 17j of the first portion 17a is suppressed by the bent shape of the corner portion 17c, the cut-out penetration The pull tab (knob) 16 can be easily pulled out by pulling the parts apart.
Furthermore, it is preferable that the opening assisting line 17 is formed by the penetrating part until it reaches the terminal part extending toward the opening part 18a on the opening start side of the opening guide line 18. In this case, the opening assisting wire 17 can be configured to have the non-penetrating portion 17j only in the first portion 17a.

The joint 17j is a non-penetrating portion (uncut portion) formed between the cut portions of the opening assist line 17, and can be formed at one or a plurality of locations of the opening assist line 17. The width of the joint 17j (the gap length between the ends of adjacent opening assisting lines) depends on the material of the body film 11, but is 0.5 to 0.5 so that it can be easily separated by hand when opening. About 1.5 mm is mentioned.
By providing the joint 17j, it is possible to prevent the opening guide line 18 from being inadvertently torn due to the pull tab 16 being caught when not in use. By pulling and pulling the pull tab 16 at the time of opening, the tearing force of the hand can be transmitted sufficiently well to the body film 11 when starting the tearing of the spout 14 along the opening guide line 18.
In the present embodiment, even when the force (opening strength) necessary for breaking the joint 17j is relatively large, unintentional tearing downward can be prevented by devising the shape of the corner portion 17c. Further, since the tear strength downward from the corner portion 17c is larger than the tear strength of the opening guide line 18, the difference in the tearing direction is conscious between tearing the opening auxiliary line 17 and tearing the opening guide line 18. Even if it does not exist, it can continue to tear to the opening guide line 18, and it becomes a packaging bag with a spout which cannot open easily.

In the case of this embodiment, the end 18a on the opening start side of the opening guide line 18 is close to or intersects with the terminal end of the opening assisting line 17. The end 18a on the opening start side may be separated from the opening assisting line 17. The end 18a on the opening start side can also have an opening that opens in the shape of a letter C toward the end of the opening assisting line 17. In this case, the opening angle of the opening is preferably about 60 to 120 °, and the opening width is preferably about 3 to 7 mm.
The end 18b on the unsealing end side of the unsealing guide line 18 may reach the side end 14b, and a slight unsealed portion may be interposed between the end 18b and the side end 14b.

  When opening the packaging bag 10 of the present embodiment, first, the joint 17j of the opening assisting wire 17 is broken to separate the pull tab 16 from the flow path forming seal portion 15a. Then, the pull tab 16 is pinched to start tearing, and the cut is advanced along the opening guide line 18 from the upper side of the unsealed portion 15 to the side. Thereby, the flow path sealing seal 15c is separated, and an opening is formed in the flow path. Further, by continuing the tearing of the opening guide line 18 beyond the end 18b on the opening end side to the side end 14b, the flow path sealing seal 15c and the flow path forming seal 15b are disconnected. .

  In the packaging bag 10 of the present embodiment, a shape-retaining material (not shown) such as a tube can be provided in the unsealed portion 15 serving as a flow path. In this case, the body films 11 and 11 are separated from each other, and the expanded state of the flow path can be maintained at the time of pouring. Although not particularly shown, it is preferable that the body films 11 and 11 are provided with a bulging portion that bulges outward around the shape retaining material. This bulging portion is preferably formed in advance (before putting the shape-retaining material) on the body films 11 and 11 by vacuum forming or pressure forming in the process of manufacturing the packaging bag.

Examples of the material constituting the shape retaining material include polyolefin resins such as polyethylene, polypropylene, and ethylene vinyl acetate copolymer (EVA), and synthetic resins such as polyamide, polyester, polystyrene, and polycarbonate. Of these, polyolefin resins such as polyethylene, polypropylene, and EVA are preferable from the viewpoint of heat bonding with the sealant layer on the inner surface of the body film 11 by heat sealing.
The shape of the shape-retaining material is not limited to a tube having both ends opened, such as a cylindrical body, an elliptical cylindrical body, or a rectangular cylindrical body having a square cross section. Various forms such as a rod-like body having a shape, a polygon such as a triangle or a quadrangle, a U-shaped cross-section, an H-shape, or a T-shape can be employed. The shape-retaining material preferably has a shape with a constant cross-section in the longitudinal direction so as not to block the flow path (such as a cylindrical body or a rod-shaped body), and is easy to fix to the film and does not hinder the flow of contents. The cylindrical body is more preferable, and among them, the cylindrical body is more preferable because the surface to be fixed is free and positioning when fixing to the film is easy. In fixing, it is desirable to align the longitudinal direction of the shape-retaining material with the direction of the flow path.
In the present invention, the shape-retaining material and the surrounding bulge are not essential, and the shape-retaining material may be omitted. When the shape retaining material is provided, it is preferable that the opening guide line 18 is provided at a position that does not intersect the shape retaining material. Thereby, the shape-retaining material is not caught or exposed at the time of opening.
The shape-retaining material is preferably located at least 0.3 mm away from the opening guide line 18 and the closest distance between the shape-retaining material and the opening guide line 18 is in the range of 0.3 to 10 mm. It is preferable.

As mentioned above, although this invention has been demonstrated based on suitable embodiment, this invention is not limited to the above-mentioned example, Various modifications are possible in the range which does not deviate from the summary of this invention.
For example, the spout of the packaging bag may have a shape in which the tip portion projects from the upper side of the packaging bag. The spout in this case preferably has a shape that surrounds both sides of the spout with substantially vertical sides, like the upper side 14a and the side end 14b of the packaging bag 10 of the above embodiment.
The bottom film is not essential, and the packaging bag may be a flat bag such as a three-side sealed bag or a four-side sealed bag. Alternatively, a folded film such as the bottom film 12 may be interposed on the side of the packaging bag, for example, on the side opposite to the spout 14 (the right side in FIG. 1).

Hereinafter, the present invention will be specifically described in comparison with Examples and Comparative Examples.
As shown in FIG. 2, the packaging bag 10 of Example 1 in which the corner portion 17c of the opening assisting line 17 has a protruding portion 17d bent from the first portion 17a, and as shown in FIG. The packaging bag 100 of the comparative example 1 with which the corner part 17c was continuously extended from the 1st part 17a was produced. The materials and dimensions were the same except for the presence or absence of the protruding portion 17d and the shape of the corner portion 17c.

In the packaging bag 10 of Example 1, the corner portion 17c is a width _{D 1} which projects from the extension of the first portion 17a, and equal to the radius R of the circular arc of the corner portion 17c (see Figure 2 (b)).
In the packaging bag 100 of the comparative example 1, the corner part 17c started the circular arc smoothly from the intersection P with the 1st part 17a. That is, at the intersection point P, the arc tangent of the corner portion 17c is made to coincide with the straight line of the first portion 17a (see FIG. 4B).

(Corner tear strength measurement method)
As shown in FIGS. 5 and 6, the left and right sides of the first portion 17a of the opening assisting line 17 are sandwiched between the separate grippers 21 and 22 arranged so as to be parallel to the first portion 17a. Pulling at the speed of 300 mm / min, the pulling direction (arrows A and B in FIGS. 5 to 6) of the two grippers 21 and 22 being both substantially perpendicular to the plane formed by the packaging bag and opposite to each other, The force was increased until tearing downward (see the tearing part 20 in FIGS. 5 to 6) toward the lower part of the spout 14 and the body part. At this time, the tear force (unit: Newton) applied to the sample was measured, and the value of the tear force was defined as the corner portion tear strength (unit: Newton).
The joint 17j provided in the first portion 17a has been broken in advance so that the force required to break the joint 17j does not affect the tearing force.

(Measurement method of half-cut wire tear strength)
Measured in the same way as the corner tear strength, except that the two grippers were placed parallel to the half-cut line of the opening guide line 18 and the force was increased until the opening guide line 18 was torn. did.

  Table 1 shows the measurement results. The corner tear strength was measured 30 times for each of Example 1 and Comparative Example 1, and the average value, maximum value, and minimum value were obtained. The half-cut line tear strength was almost the same between Example 1 and Comparative Example 1.

  As shown in Table 1, in the packaging bag 10 of Example 1, the tearing force for tearing downward toward the lower part of the spout 14 and the body part was increased, and the opening assisting line 17 that was difficult to tear was obtained. . Thereby, the tearing from a corner part to the downward direction can be suppressed at the time of opening.

DESCRIPTION OF SYMBOLS 10,100 ... Packaging bag, 11 ... Trunk film, 11a, 11b ... Side end seal part, 12 ... Bottom film, 12a ... Folding line, 12b ... Bottom seal part, 13 ... Sealing part of filling port, 14 ... Spout , 14a ... upper side, 14b ... side end, 14c ... upper seal part, 15 ... unsealed part to be a flow path, 15a, 15b ... flow path forming seal part, 15c ... flow path sealing seal part, 16 ... pull tab ( 17) ... 1st part, 17b ... 2nd part, 17c ... Corner part, 17d ... Projection part, 17j ... Non-penetrating part (joint), 17n ... Notch, 18 ... Opening guide Line, 18a ... Opening side end, 18b ... Opening end side, 20 ... Tear part, 21, 22 ... Grab.

Claims (5)

A packaging bag provided with an unsealed portion serving as a flow path for a spout at the upper corner of the packaging bag,
The unsealed portion above the unsealed portion is extended downward from the upper side of the packaging bag toward the flow path as an opening assisting line for starting unsealing. An opening assist line having a planar shape extending obliquely upward along the road and further extending toward the opening start side end of the opening guide line by changing the direction is provided,
Of the auxiliary opening line, a direction is defined between a first part extending downward from the upper side toward the flow path and a second part extending obliquely upward along the flow path. A packaging bag with a spout, characterized in that the corner to be changed has a projecting portion that bends and projects farther from the spout than the first portion.   2. The corner portion has an arc shape, and a width of the corner portion protruding from an extension line of the first portion is ½ times or more of a radius of the arc of the corner portion. A packaging bag with a spout as described in 1.   The packaging bag with a spout according to claim 1 or 2, wherein an angle at which the start side of the corner portion is bent from the end side of the first portion is 90 to 120 °.   The angle formed between the direction of the start side of the corner portion bent from the end side of the first portion and the direction perpendicular to the upper side of the packaging bag is 90 to 120 °. The packaging bag with a spout of any one of -3.   The opening assist line is a cut line having a non-penetrating part in the first part, and the entire corner part is formed by a penetrating part that penetrates a plurality of films constituting the spout. The packaging bag with a spout according to any one of claims 1 to 4.

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