JP2019001524A - Packaging bag - Google Patents

Abstract

To provide a packaging bag formed with a laminated film containing an aluminum layer, the packaging bag being capable of suppressing occurrence of a small crack in the aluminum layer in a vicinity of an inner edge of a seal portion.SOLUTION: A rectangle packaging bag formed with laminated film containing an aluminum layer and having at least three end edges sealed to form a storage part includes a weakened line in the storage part away from the sealed portion in plan view at which strength of the laminated film is weakened and a notch that is formed in at least one of the three end edges and triggers breakage of the laminated film when the storage part is opened. The weakened line is formed in a direction orthogonal to the end edge in which the notch is formed and on a straight line elongating from the notch to an end edge opposite to the end edge at which the notch is formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging bag.

  After folding a single rectangular laminated film in half and sealing the combined edges to form a container, a set of rectangular laminated films and a pair of rectangular laminated films are stacked on top of each other. A packaging bag such as a four-side sealed bag formed by sealing (heat sealing) to form an accommodation portion is known.

  In Patent Document 1, a weakening line (scheduled opening line) that extends in parallel along each of two adjacent edges among the four edges, and whose strength is weakened by a half cut or the like, is formed on the front and back laminated films. A rectangular packaging bag (four-side seal bag) formed in the above is disclosed. In this packaging bag, for example, a sheet-like content such as a tape material or a patch for transdermal administration of a drug can be packaged.

  The user of the packaging bag first breaks the laminated film to the other end facing the weakened line near the notch using a notch (notch) formed at the edge of the packaging bag as a trigger. Next, the user of the packaging bag uses the notch formed at the other edge of the packaging bag as a trigger, and breaks the laminated film along the weakening line in the vicinity of the notch to the other opposite end. As a result, an opening is formed in the packaging bag, which is composed of broken lines formed along two weakening lines. Thereby, since the opening is opened widely, the user of the packaging bag can easily take out the contents from the opening.

International Publication No. 2015/105101

  In such a packaging bag, when the end edge is sealed, the laminated film is pressed by the seal bar, so that a tensile load is easily generated on the laminated film at the inner edge of the seal portion. In particular, when the seal portion is formed in a state where the hard and thick contents are accommodated, the laminated film on the inner edge of the seal portion is pressed in a state of being expanded in the thickness direction of the packaging bag, and thus a larger tensile load is likely to occur. .

  Here, in a packaging bag in which an aluminum layer is included in a laminated film, a weakening line that facilitates opening from the seal portion to the housing portion may be formed. In such a packaging bag, the weakening line is formed by thinning the outermost layer. For this reason, if stress concentrates on the aluminum layer around the weakening line near the inner edge of the seal part during the sealing process, distribution after sealing, and storage, minute cracks (breaks) occur, and the barrier performance of the packaging bag is lost. There was a risk of being.

  The present invention has been made in view of such problems, and in a packaging bag formed using a laminated film including an aluminum layer, it is an object to suppress the occurrence of microcracks in the aluminum layer near the inner edge of the seal portion. And

  One aspect of the present invention for solving the above problems is a rectangular packaging bag in which a laminated film including an aluminum layer is overlaid and at least three edges are sealed to form a housing portion, and the strength of the laminated film The weakening line which weakened is a packaging bag formed away from the seal portion on the housing portion in plan view.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the micro crack in the aluminum layer of the seal | sticker part inner edge vicinity can be suppressed in the packaging bag formed using the laminated | multilayer film containing an aluminum layer.

The top view and side view of the packaging bag which concern on one Embodiment of this invention The figure explaining the formation position of the weakening line The top view of the packaging bag which concerns on the modification of this invention The top view of the packaging bag which concerns on the modification of this invention The top view of the packaging bag which concerns on the modification of this invention

  A packaging bag according to an embodiment of the present invention will be described with reference to the drawings. In the modified examples, the same or corresponding components are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 1 shows a plan view and a side view of a packaging bag 100 according to an embodiment of the present invention. The packaging bag 100 is a four-side sealed packaging bag including a housing portion 30 surrounded by a seal portion 20 formed by overlapping two rectangular films 10 and sealing four end edges 71 to 74. The packaging bag 100 is further formed on at least two locations of the first weakening line 41 and the second weakening line 42 that are formed on at least the accommodating portion 30 and weaken the strength of the film 10 and the edges 71 to 74. The first notch 51 and the second notch 52 are provided to trigger the breakage of the film 10 when the accommodating portion 30 is opened.

  In the following description, the edge on which the first notch 51 is formed is referred to as the first edge 71, and the edge opposite to the first edge 71 is referred to as the second edge 72 and the first edge 71. Of the adjacent edges, the edge close to the first notch 51 is referred to as a third edge 73, and the edge facing the third edge 73 is referred to as a fourth edge 74.

(the film)
The film 10 is formed in a rectangular shape, and the packaging bag 100 having the accommodating portion 30 can be formed by sealing the edges 71 to 74. The film 10 is a multilayer film including an aluminum layer. In the film 10, a sealant layer can be used as the innermost layer in order to seal the edges 71 to 74 by heat sealing or the like. Examples of other layers constituting the film 10 include polyethylene terephthalate (PET), aluminum (AL), cellophane, polyethylene (PE), transparent deposited PET, low-adsorption sealant (PET having heat sealability, cyclic polyolefin) , EVOH sealant, etc.) can be used, and these may be used in appropriate combination.

(notch)
The first notch 51 and the second notch 52 are cuts formed in the edges 71 to 74 of the packaging bag 100. The user of the packaging bag 100 can break the film 10 using the first notch 51 and the second notch 52 as an opening when the container 30 is opened. As shown in FIG. 1, the packaging bag 100 includes a first notch 51 formed at the first end edge 71 and a second notch 52 formed at the fourth end edge 74. Each of the first notch 51 and the second notch 52 is formed by cutting the seal portion 20 linearly over a predetermined length toward the opposing edges 71 to 74. The shape of the first notch 51 and the second notch 52 is not limited to a straight line as long as it triggers the breakage of the film 10, and a notch shape such as a triangle or a pentagon can be adopted.

(Weak line)
The first weakening line 41 and the second weakening line 42 are places where the strength of the film 10 is weakened linearly. By the first weakening line 41, the break line triggered by the first notch 51 can be guided to the vicinity of the seal portion 20 of the second edge 72 that is the edge opposite to the first edge 71. it can. Further, the second weakening line 42 guides the breaking line triggered by the second notch 52 to the vicinity of the seal portion 20 of the third end edge 73 that is the end facing the fourth end edge 74. be able to.

  In the packaging bag 100, the first weakening line 41 and the second weakening line 42 are formed on both the two films 10 so as to overlap each other in plan view when formed on the packaging bag 100. It may be formed on only one of the sheets of film 10.

  As shown in FIG. 1, the first weakening line 41 and the second weakening line 42 are formed on the housing part 30 away from the seal part 20 in plan view. The first weakening line 41 and the second weakening line 42 extend from the first notch 51 and the second notch 52 in a direction orthogonal to the first end edge 71 or the fourth end edge 74. It is formed on a virtual straight line (not shown).

  In FIG. 2, the enlarged view of the packaging bag 100 which demonstrates the formation position of the weakening line by making the 1st weakening line 41 into an example is shown. The distance La between the end portion of the first weakening line 41 and the seal portion inner edge 21 is preferably large, and specifically, it is preferably 1 mm or more. By setting the distance La to 1 mm or more, the first weakening line 41 is not formed in the vicinity of the inner edge 21 of the seal portion, so that concentration of stress on the aluminum layer in the vicinity of the inner edge 21 of the seal portion can be prevented. As a result, generation of micro cracks in the aluminum layer in the vicinity of the seal portion inner edge 21 can be suppressed.

  The first weakening line 41 and the second weakening line 42 are obtained by forming intermittent linear cuts (half cuts) in the film 10. Specifically, the first weakening line 41 and the second weakening line 42 can be formed by providing a cut that penetrates only the outermost layer of the laminated film. For the formation of the first weakening line 41 and the second weakening line 42, a known method such as a method using a blade type such as a Thomson blade or a leather blade or a method using a carbon dioxide gas laser can be used. .

(Modification)
The first weakening line 41 and the second weakening line 42 may be curved instead of linear. FIG. 3 shows a packaging bag 101 according to a modified example in which the first weakening line 41 and the second weakening line 42 are formed by curves.

  The shape of the 1st weakening line 41 and the 2nd weakening line 42 is not limited to the perforation comprised by an intermittent cut, if the intensity | strength of the film 10 can be weakened linearly. FIG. 4 shows a packaging bag 102 according to a modification in which the first weakening line 41 and the second weakening line 42 are formed by arranging two straight lines each formed by intermittently forming a linear half cut. . Further, in FIG. 5, the first weakening line 41 and the second weakening line 42 are formed as eight-character perforations in which a plurality of sets of two fine cuts that are eight-shaped are arranged in a line. The packaging bag 103 which concerns on the modified example is shown. In addition to this, the first weakening line 41 and the second weakening line 42 may have a shape such as a straight line or a multiple line in which a plurality of straight lines are arranged.

  Although the packaging bag 100 is a four-side sealed bag, the packaging bag is not limited to a four-side sealed bag as long as the packaging bag is a rectangular packaging bag in which at least three end edges are sealed to form an accommodation portion. As the packaging bag, for example, a three-side sealed bag in which one rectangular laminated film is folded in two and the combined edges are sealed may be used. Moreover, you may use the four-sided sealing bag which made one rectangular laminated film into two, and was made into four edges.

  Although the packaging bag 100 is formed with the first weakening line 41 and the second weakening line 42 one by one, any one weakening line may be used.

  The packaging bag which concerns on an Example and a comparative example was manufactured, and the presence or absence of the generation | occurrence | production of the micro crack in the aluminum layer of each packaging bag was evaluated. The packaging bag which concerns on an Example was manufactured by changing the weakening line formation position (space | interval La) and the weakening line shape of the packaging bag 100 shown in FIG. The packaging bag according to the comparative example was formed so that the weakening line of the packaging bag 100 was in contact with the seal portion. In both the example and the comparative example, as in the packaging bag 100, two weakening lines are formed so as to be symmetric with respect to a diagonal line starting from an angle at which two end edges formed with two notches are in contact with each other. (First and second weakening lines).

As the packaging bags according to all the examples and comparative examples, all the films using the films having the following layer structures in order from the outermost layer to the innermost layer were prepared.
(1) Polyethylene terephthalate (PET) (12 μm) / Aluminum (AL) (7 μm) / PET having heat sealability (20 to 50 μm)
(2) Cellophane (# 300 to 500) / AL (7 μm) / PET having heat sealability (20 to 50 μm)
(3) PET (12 μm) / AL (9 μm) / Polyethylene (PE) (20-50 μm)
(4) PET (12 μm) / PE (10-30 μm) / AL (7 μm) / PE (10-40 μm)
(5) Cellophane (# 300-500) / PE (10-30 μm) / AL (7 μm) / PE (10-40 μm)

  After the film was cut into a rectangular shape corresponding to the dimensions of the packaging bag described later, weakening lines were formed on the film surface. Thereafter, two films having weakening lines are prepared, and these are overlapped so that the innermost layer (sealant layer) faces each other, and then the prepared contents are accommodated in the accommodating portion and the four edges are heated. Sealed. The seal width (Ls in FIG. 2) was 5 mm. Finally, a linear notch was formed in the seal portion to form a packaging bag. The notch was formed at a position where the distance (Ln in FIG. 2) from the corner of the packaging bag where adjacent edges contact each other was 10 mm. The contents contained in the packaging bag used a tape agent having a size of 30 mm smaller than the size of each packaging bag by 30 mm in each of the left and right and upper and lower sides and a thickness of 5 mm.

  In Table 1, the dimensions of each packaging bag according to Examples 1 to 14 and Comparative Examples 1 to 11, both ends of the first and second weakening lines, the inner edge of the seal part, the distance La, the shape of the weakening line, and The evaluation results (presence or absence of cracks in the aluminum layer) were shown. When the distance La is a positive value, the weakening line is separated from the seal part in a plan view, and when the distance La is negative, the weakening line is formed on the seal part.

  The packaging bags according to Examples 1 to 14 were formed by separating each of the first and second weakening lines by 1 mm or more from the inner edge of the seal portion. For this reason, the stress which generate | occur | produces in the aluminum layer of the seal part inner edge vicinity by a seal | sticker can be made small, and as shown in Table 1, the micro crack did not generate | occur | produce in all the samples. Therefore, it was confirmed that the microcracks in the aluminum layer near the inner edge of the seal portion can be suppressed by forming the weakening line away from the seal portion.

  On the other hand, the packaging bags according to Comparative Examples 1 to 11 were formed on the seal part or the weakened line was in contact with the seal part. For this reason, a large stress was generated in the aluminum layer in the vicinity of the inner edge of the seal portion during sealing, and as shown in Table 1, microcracks were generated in all samples.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for packaging sheet-like contents such as tape materials and patches for transdermal administration of drugs.

100 to 103 Packaging bag 10 Film 20 Sealing portion 21 Inner edge 30 of sealing portion 41 First weakening line 42 Second weakening line 51 First notch 52 Second notch 71 First edge 72 Second Edge 73 third edge 74 fourth edge

Claims (3)

A rectangular packaging bag in which a laminated film including an aluminum layer is overlaid and at least three edges are sealed to form a container,
A weakening line that weakens the strength of the laminated film,
A packaging bag formed away from the seal portion on the accommodating portion in plan view. Further comprising a notch formed on at least one of the three edges, which triggers the laminated film to break when the container is opened;
The weakening line is
The packaging bag according to claim 1, wherein the packaging bag is formed on a straight line extending from the notch to an edge opposite to the edge where the notch is formed in a direction perpendicular to the edge where the notch is formed.   The packaging bag according to claim 1 or 2, wherein a distance between each of both ends of the weakening line and an inner edge of the seal portion is 1 mm or more.

Images