JP2013103732A - Easily-openable packaging bag with notch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily-openable packaging bag with notches, tearable linearly.SOLUTION: The packaging bag 1 is formed by placing one laminate film 10 upon another while opposing thermal fusion layers 11 and by thermally fusion-bonding edges 20. The laminate film 10 has a linear tearing property in the MD direction, is arranged so that the MD direction is parallel to the tearing direction of the packaging bag 1, and is formed with a number of cuts 31 in the edge 21 crossing the tearing direction. The packaging bag is easily openable from the cut portion formed in the edge 21 and is tearable linearly along the MD direction. There is no risk that opening becomes insufficient and the content cannot be taken out or the bag is opened largely and the content drops out.

Description

  The present invention relates to an easily openable notched packaging bag. More specifically, the present invention relates to a packaging bag with an easily openable notch that can be easily opened by the force of fingers.

As a packaging bag that can be easily opened with the power of a finger without using a tool such as scissors, a packaging bag with an easy-open notch in which notches and scratches are processed on the edge of the packaging bag is known (for example, Patent Document 1). ). Since notches and scratches can be opened with a small force, if the notches and scratches are processed, they can be opened easily with the power of fingers.
However, if it is torn from the processed part of the notch or scratch, it may be torn diagonally without being torn straight, the opening will be insufficient and the contents will not be able to be taken out, or the contents will spill out due to large opening There was a fear.

In order to deal with the above problem, there have been proposed ones in which notched yarns are provided along the tearing direction of the packaging bag (for example, Patent Document 2) and those in which cut lines are processed (for example, Patent Document 3). Such a packaging bag can be torn along the cut yarn and the cut line, so that the above problem can be solved.
However, the above-described conventional packaging bag requires a device for providing notched yarns or processing cut lines, and thus has a problem that processing costs increase.

JP 2004-315055 A JP 59-136237 A Japanese Utility Model Publication No. 4-89760

  In view of the above circumstances, an object of the present invention is to provide a packaging bag with an easily openable notch that can be torn linearly.

The easy-opening notched packaging bag of the first invention is a packaging bag formed by laminating a laminated film having a heat-sealing layer with the heat-sealing layers facing each other and heat-sealing the edges. The laminated film has a linear tearing property in the MD direction, and is arranged so that the MD direction is parallel to the tearing direction of the packaging bag, and a large number of scratches are formed at the edges intersecting with the tearing direction. It is formed.
The packaging bag with an easily openable notch according to a second aspect of the present invention is the first aspect, wherein the scratch is formed in an opening start region that defines a position at which opening of the packaging bag is started, at an edge that intersects the tearing direction. It is characterized by being.
The easy-opening notched packaging bag of the third invention is characterized in that, in the first or second invention, the scratch is substantially triangular and is formed so that its long side is parallel to the tearing direction. And
The easily openable notched packaging bag of the fourth invention is characterized in that, in the third invention, the scratches are arranged in a zigzag pattern, and two or more are formed in a direction perpendicular to the tearing direction. .
The manufacturing method of the easily openable notched packaging bag of the fifth invention is a method of forming a packaging bag from a laminated film having a heat-sealing layer and having linear tearability in the MD direction. Arranged so that the MD direction is parallel to the tearing direction of the packaging bag, and the heat-fusible layers are opposed to each other, the edges are heat-sealed, and a large number of scratches are formed at the edges intersecting the tearing direction. It is characterized by forming.
The manufacturing method of the easy-opening notched packaging bag of the sixth invention is the fifth invention, wherein a plurality of scratches are formed by pressing a pin having a plurality of blades formed at the tip at the edge intersecting the tearing direction. It is characterized by forming.

According to the first invention, the laminated film is arranged so that the MD direction is parallel to the tearing direction, and a large number of scratches are formed at the edge that intersects the tearing direction. And can be torn linearly along the MD direction. Therefore, there is no risk that the opening will be insufficient and the contents cannot be taken out, or that the contents will be spilled off due to the large opening.
According to the second invention, since the scratch is formed in the opening start region, the opening position can be limited. Therefore, it can open from the suitable opening position, and it can prevent that the contents spill and fall and damage the contents at the time of opening.
According to the third invention, since the long sides of the substantially triangular scratches are parallel to the tearing direction, tearing is started along the tearing direction, and it becomes easier to tear linearly.
According to the fourth invention, since two or more scratches are formed in the direction orthogonal to the tearing direction, the tearing is started by at least one of the scratches and the opening can be surely performed.
According to the fifth invention, the laminated film is arranged so that the MD direction is parallel to the tearing direction, and a large number of scratches are formed at the edges intersecting with the tearing direction. And can be torn linearly along the MD direction. Therefore, there is no risk that the opening will be insufficient and the contents cannot be taken out, or that the contents will be spilled off due to the large opening.
According to the sixth invention, a large number of scratches can be formed by a simple method.

It is a top view of the packaging bag with an easily openable notch which concerns on one Embodiment of this invention. It is sectional drawing of the edge part of the easily openable packaging bag with a notch. It is an enlarged plan view of the opening start area | region of the packaging bag with the easily openable notch. It is explanatory drawing of the manufacturing method of the packaging bag with the easily openable notch. It is a side view near the pin of a production line. FIG. 6 is a view taken along line VI-VI in FIG. 5. It is an enlarged plan view of a portion where a flaw is formed on the loaded film.

Next, an embodiment of the present invention will be described with reference to the drawings.
First, the structure of the easily openable notched packaging bag 1 according to an embodiment of the present invention will be described.
As shown in FIG. 1, the easy-opening notched packaging bag 1 includes two laminated films 10 and 10 each having a heat-sealing layer, with the heat-sealing layers facing each other, and left and right side edges. It is a packaging bag formed by heat-sealing the parts 21, 21, the upper edge part 22, and the bottom edge part 23 (hereinafter, these are also simply referred to as the edge part 20). The easy-opening notched packaging bag 1 is used for packaging various types and shapes of products such as liquids, pastes, solids, and powders such as foods, medicines, and small items.

  As shown in FIG. 2, a laminated film 10 forming the easy-open notched packaging bag 1 is an MD (Machine Direction) direction among known films in which a heat fusion layer 11 and a base material layer 12 are laminated. Have linear tearability.

  As the heat sealing layer 11, a polyethylene resin film such as a low density polyethylene, a medium density polyethylene, a high density polyethylene, a linear low density polyethylene, a copolymer resin of a vinyl compound copolymerizable with ethylene, or a polypropylene type A resin film or the like is used. Moreover, as the base material layer 12, a polyolefin resin film such as polypropylene, a polyamide resin film such as nylon 6, nylon 66, and nylon 12, a polyester resin film such as polyethylene terephthalate and polybutylene terephthalate, and the like are used.

Further, in the case where gas barrier properties such as water vapor and oxygen and aroma barrier properties are required for storing the contents, a resin layer mainly composed of polyvinylidene chloride resin or ethylene vinyl alcohol resin is used as the base material layer 12. The base layer 12 may be a film in which a metal oxide or a metal is vapor-deposited. Further, an intermediate layer is provided between the heat-sealing layer 11 and the base material layer 12, and as the intermediate layer, a film having gas barrier properties, for example, a metal foil such as aluminum, a polyvinylidene chloride resin film, an ethylene vinyl alcohol resin film Alternatively, coextruded films of these and other resins may be used.
In addition, as the laminated | multilayer film 10, it is not restricted to a 2 layer or 3 layer thing, You may use what laminated | stacked the layer beyond this.

As the laminated film 10 used in the present invention, at least the base material layer 12 is stretched by a uniaxial stretching method or a biaxial stretching method and has a linear tearing property in the MD (Machine Direction) direction.
Here, when the plastic film is stretched, it is molecularly oriented in the stretching direction and has a linear tearing property along the orientation direction. In general, since the orientation direction is parallel to the stretching direction of the plastic film, the plastic film stretched in the MD direction has linear tearability in the MD direction.

Depending on the stretching method, the orientation direction may not exactly match the stretching direction. Even in this case, if the angle of the orientation direction with respect to the MD direction is within the range of 0 ° to 20 °, it can be adopted as the laminated film 10 used in the present invention.
“Having linear tearability in the MD direction” described in the claims is a concept that includes an orientation direction having an angle of 0 ° to 20 ° with respect to the MD direction.

As shown in FIG. 1, the laminated film 10 is arrange | positioned so that MD direction may become in parallel with the tearing direction of the packaging bag 1 with an easily openable notch. Here, the tearing direction is a direction in which the laminated film 10 is torn when the easy-opening notched packaging bag 1 is opened, and is arbitrarily set based on the contents and the shape of the easy-opening notched packaging bag 1. The
In the easily openable notched packaging bag 1 according to the present embodiment, the short direction (the left-right direction in FIG. 1) of the easily openable notched packaging bag 1 is set as the tear direction, and the laminated film 10 is in the MD direction. Are arranged in parallel with the tearing direction. In addition, the TD (Transverse Direction) direction of the laminated film 10 is parallel to the longitudinal direction of the easy-open notched packaging bag 1 (vertical direction in FIG. 1), that is, the direction orthogonal to the tearing direction.

An opening start region 30 is defined at a position close to the upper edge portion 22 at the edge 20 orthogonal to the tearing direction, that is, the left and right side edges 21, 21, and a number of scratches are formed in the opening start region 30. Has been. As will be described later, since many scratches formed in the opening start area 30 are opened even with a small force, they can be easily opened from the opening start area 30 with the force of fingers. In other words, the position at which the opening of the easy-opening notched packaging bag 1 is started by the opening start region 30 is determined.
In the present embodiment, the opening start region 30 is defined on both the left and right side edges 21, 21, but the opening start region 30 may be defined only on one of the side edges 21. However, it is easier to open regardless of whether you are right-handed or left-handed. Regardless of the front and back of the bag 1, it can be opened from a preferred direction, which is preferable.

In addition, a strip-shaped bottom film 13 is sandwiched between the two laminated films 10 and 10 at the bottom edge 23, and the bottom film 13 and the laminated films 10 and 10 are heat-sealed. The bottom film 13 is also formed of the same material as that of the laminated film 10, is valley-folded, and is arranged so that the valley-folded portion faces the inside of the easily openable notched packaging bag 1. In addition, two laminated films 10 and 10 are heat-sealed to a part of the left and right ends of the bottom edge 23.
Since the bottom of the easy-opening notched packaging bag 1 is formed by the bottom film 13, the capacity of the easy-opening notched packaging bag 1 is increased, and the easy-opening notched packaging bag 1 is placed upright. Will be able to.

  As described above, the laminated film 10 is arranged so that the MD direction is parallel to the tearing direction, and a large number of scratches are formed on the side edge portions 21 and 21 orthogonal to the tearing direction. Can be easily opened and can be torn linearly along the MD direction. Therefore, there is no risk that the opening will be insufficient and the contents cannot be taken out, or that the contents will be spilled off due to the large opening.

Further, since many scratches are formed in the opening start region 30, the opening position can be limited. Therefore, it can be prevented from being opened from a suitable opening position such as a position close to the upper edge portion 22 and spilling or damaging the contents during opening.
In addition, it is preferable to perform printing or the like indicating the position of the opening start area 30 because the opening start area 30 is easily visible.

As shown in FIG. 3, a large number of substantially triangular scratches 31 each having a long side are formed in the opening start region 30 so that the long side is parallel to the tearing direction (the horizontal direction in FIG. 3). Yes. The scratch 31 is formed to the depth immediately before penetrating the side edge portion 21 or penetrating the side edge portion 21.
Since the wound 31 is opened even with a small force, the easily openable notched packaging bag 1 can be easily opened with the force of fingers. Moreover, since the long side of the wound 31 is parallel to the tearing direction and the acute angle of the wound 31 faces the tearing direction, the tearing is started along the tearing direction, and the easy-open notched packaging bag 1 is more straight. It becomes easy to be torn.

Further, the scratches 31 are arranged in a four-row zigzag pattern, and two or more scratches 31 are arranged when viewed in a direction perpendicular to the tearing direction (vertical direction in FIG. 3). By arranging in this way, tearing starts with at least one of the two wounds 31 arranged in the direction orthogonal to the tearing direction, so that the easily openable notched packaging bag 1 can be securely attached. Can be opened.
Although some of the scratches 31 are preferably arranged so as to cover the outer edge of the side edge portion 21, all of the scratches 31 may be arranged inside the outer edge of the side edge portion 21.

Next, a method for producing the easily openable notched packaging bag 1 will be described.
As shown in FIG. 4, two laminated films 10 and 10 are transported on the production line, and the heat fusion layers 11 and 11 are opposed to each other and overlapped. At the same time, the belt-like bottom film 13 is folded in a valley and sandwiched between the bottom edges between the two laminated films 10 and 10 (FIG. 4 (1)).
Here, the two laminated films 10 and 10 are both arranged such that the MD direction is parallel to the transport direction of the production line. And since the conveyance direction of this production line is parallel to the tearing direction of the easy-opening notched packaging bag 1 to be formed, the laminated films 10 and 10 are arranged so that the MD direction is parallel to the tearing direction. Will be.
The two laminated films 10 and 10 may be taken out from separate film rolls or may be obtained by dividing one film roll in the MD direction.

  Next, the left and right side edge portions 21, 21 and the bottom edge portion 23 are heat-sealed by a known heat sealing device provided on the production line (FIG. 4 (2)).

Next, a scratch 31 is formed in the opening start region 30 of the side edge 21 (FIG. 4 (3)).
As shown in FIG. 5, a pin 40 having a plurality of blades formed at the tip is provided on the production line, and this pin 40 is moved up and down by an air cylinder (not shown) or the like. Yes. A resin receiving member 43 is provided below the pin 40. The pin 40 is lowered toward the receiving portion 43.
The laminated film 10 is conveyed between the pin 40 and the receiving member 43. And the pin 40 descend | falls in the timing when the opening start area | region 30 came just under the pin 40, and the crack 31 is formed in the opening start area | region 30 by pinching | stacking the laminated | multilayer film 10 with the blade of the pin 40, and the receiving member 43. The

As shown in FIG. 6, a blade base 41 is attached to the tip of the pin 40, and a large number of blades 42 are formed on the blade base 41. The blades 42 have a triangular pyramid shape with one side on the bottom and are arranged in a four-row zigzag pattern.
The blade 42 may have a triangular pyramid shape with a vertex on the center of gravity of the bottom surface, or may have a triangular pyramid shape with a vertex on the long side of the bottom surface.

Moreover, as shown in FIG. 7, the pin 40 is pressed across the cutting line L which shows the boundary of the adjacent easily openable notched packaging bags 1 and 1, and the adjacent easily openable notched packaging bags 1 and 1 are adjacent. Scratches 31 are formed in the opening start regions 30 and 30 of the left and right side edges 21 and 21 at a time. Therefore, the blade base 41 is formed with two opening start regions 30 and a blade 42 for 30 minutes.
Thus, a large number of scratches 31 can be formed by a simple method.

Finally, each easy-opening notched packaging bag 1 is formed by cutting along the cutting line L (FIG. 4 (4)).
In addition, after that, goods are stored in the packaging bag 1 with an easily openable notch, and the goods are packaged by heat-sealing the upper edge part 22. FIG.

  As mentioned above, since the apparatus which provides a notch yarn or processes a cut line is unnecessary for manufacture of the easily openable notched packaging bag 1, processing cost becomes low.

(Other embodiments)
In the above embodiment, the scratch 31 is formed only in the opening start region 30, but the scratch 31 may be formed on the entire side edge portion 21. In this way, it can be opened from anywhere on the side edge 21.
Further, the shape of the scratch 31 is not limited to a triangle, and various shapes such as a dogleg shape, an I shape, and a diamond shape can be employed.
Moreover, you may employ | adopt various methods, such as pressing the roller in which the blade was formed in the side surface, not only the method of pressing the pin 40 and forming the damage | wound 31. FIG.

  Moreover, it is good also as a structure which does not provide the bottom film 13. FIG. In this case, one laminated film 10 taken out from one film roll is folded back in the TD direction, and the heat fusion layers 11 and 11 are overlapped to face each other, and the side edges 21 and 21 are thermally bonded. An easy-opening notched packaging bag may be formed.

DESCRIPTION OF SYMBOLS 1 Easy openable packaging bag with a notch 10 Laminated | multilayer film 11 Heat-fusion layer 12 Base material layer 13 Bottom film 20 Edge 21 Side edge 22 Upper edge 23 Bottom edge 30 Opening start area 31 Scratch 40 Pin 41 Blade stand 42 Blade 43 Receiving member

Claims (6)

A laminated bag having a heat-sealing layer is a packaging bag formed by overlapping the heat-sealing layers facing each other and heat-sealing the edges,
The laminated film has a linear tearing property in the MD direction, and is arranged so that the MD direction is parallel to the tearing direction of the packaging bag,
A packaging bag with an easily openable notch, characterized in that a large number of scratches are formed at the edge intersecting with the tearing direction. The packaging bag with an easily openable notch according to claim 1, wherein the scratch is formed in an opening start region that defines a position at which opening of the packaging bag is started, in an edge portion intersecting with the tearing direction. . The packaging bag with an easily openable notch according to claim 1 or 2, wherein the scratch has a substantially triangular shape and has a long side parallel to the tearing direction. The packaging bag with an easily openable notch according to claim 3, wherein the scratches are arranged in a zigzag pattern, and two or more are formed in a direction orthogonal to the tearing direction. A method of forming a packaging bag from a laminated film having a heat fusion layer and having linear tearability in the MD direction,
The laminated film is disposed so that the MD direction is parallel to the tearing direction of the packaging bag, and the edges are heat-sealed by overlapping the heat-sealing layers facing each other,
A manufacturing method of a packaging bag with an easily openable notch, characterized in that a large number of scratches are formed at an edge intersecting with the tearing direction. 6. The easily openable notched packaging bag according to claim 5, wherein a plurality of scratches are formed by pressing a pin having a plurality of blades formed at the tip thereof at an edge intersecting with the tearing direction. Method.

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