JP2000007016A - Laminate film for easily-tearable packaging bag, and packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag capable of being lightly unsealed by a finger force, and easily taking out its content by tearing and expanding the bag. SOLUTION: A laminate film including a uniaxial oriented film which is stretched in one transverse axis and provided with a trace group 3 with strip- like small notches arranged in a row continuously in the longitudinal direction is used, both ends in the transverse direction of the laminate film are formed into a face-to-face joined seal part 5 in a cylindrical shape, both end cylindrical opening parts are closed at end seal parts 6, 7, an unsealing starting point 8 is provided in the face-to-face joined seal part 5, and the trace group 3 is located on a surface on the same side as the face-to-face joined seal part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easily-openable laminated film for a packaging bag which is suitable for manufacturing a packaging bag which can be widely opened and opened with fingers, and a packaging bag formed using the same. More specifically, a film that is easily tearable when the packaging bag is widely torn open, for example, a dry film, a laminated film for an easily tearable packaging bag suitable for the production of packaging bags for snack foods, and a packaging bag using the same. About.

[0002]

2. Description of the Related Art Conventionally, as the easy-opening means for taking out contents from a packaging bag because the contents are packed, the strength of the sealing portion of the packaging bag is controlled, and the sealing portion is peeled off with the force of a finger. Being able to open, providing a notch or a fine scratch on the sealing part of the packaging bag and using the finger as a starting point to open the film by using it as a starting point for opening, and a fine scratch on the folded part of the packaging bag It is known that a film can be opened by tearing the film with the force of a finger from the opening starting point.

[0003]

By the way, the conventional easy-opening means mainly aims at opening one end of the packaging bag so that the packaging bag can be opened, so that the packaging bag can be largely torn open. Not something. For this reason, in the case of a deep packaging bag or in the case where the content of the packaging bag and the content are high, there is a problem that the content is caught in the packaging bag and cannot be taken out well, and the shape of the content is broken or broken. In particular, when the contents are large or bulky, such as dried foods and snack foods, and more specifically, potato chips, rice crackers, steamed buns, and the like, such inconveniences tend to occur when taken out of the bag. Also, for example, when picking potato chips with several people, it is easier to tear open the packaging bag so that the contents can be exposed, but conventional easy-opening means can not tear open widely with fingers, which is inconvenient. I often feel it.

[0004] The present invention provides a packaging bag which can be opened lightly with the force of a finger when opened, and which can easily take out the contents by tearing and widening, and the packaging bag can be easily manufactured. It is an object of the present invention to provide a laminated film that can be used.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention provides a laminated film comprising a uniaxially stretched film uniaxially stretched and a heat-sealing resin layer,
Provided is a laminated film for an easily tearable packaging bag, characterized in that a scar group in which short linear fine cuts are arranged in a row is continuously provided in at least a uniaxially stretched film in a longitudinal direction. Things.

Further, the present invention provides a laminated film for an easily tearable packaging bag, which is formed into a tubular shape by sealing both ends in the lateral direction with a palm and sealing the opening at both ends of the tubular shape. In addition, the present invention also provides a packaging bag in which an opening start point is provided in the palm joint portion and a scar group is located on the same surface as the palm joint portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a laminated film for easily tearable packaging bags according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, this laminated film includes a uniaxially stretched film 1 stretched uniaxially in the horizontal direction and a heat-sealing resin layer 2.

The uniaxially stretched uniaxially stretched film 1 in the present invention is obtained by stretching a long film uniaxially in the width direction. As this film material, for example, a polyolefin-based film such as high-density polyethylene or polypropylene can be suitably used. Also,
The stretching ratio of the transverse uniaxial stretching is preferably about 3 to 10 times, and the film may be slightly stretched in the longitudinal direction (longitudinal direction).

As will be apparent from the description of the packaging bag according to the present invention described later, the laminated film is provided with a crack that progresses in the transverse direction (the stretching direction of the uniaxially stretched film 1), and the longitudinal direction (the uniaxially stretched film) (A direction perpendicular to the stretching direction of No. 1) and guided in an L-shape so as to be greatly torn apart. The reason why the configuration of the present laminated film includes the uniaxially stretched film 1 which is stretched uniaxially in the transverse direction is to facilitate the induction of the tear in the transverse direction along the stretching direction.

The heat-sealable resin layer 2 is a layer made of a heat-fusible synthetic resin used for heat sealing when used as a packaging bag, and is provided on the inner surface side when the packaging bag is used. As the heat-sealing resin constituting the heat-sealing resin layer 2, for example, a low-density polyethylene resin, a linear low-density polyethylene resin, an ethylene-vinyl acetate copolymer resin, a polypropylene resin, or the like is suitably used.

The present laminated film is a laminated film in which at least the uniaxially stretched film 1 and the heat-sealable resin layer 2 are laminated, and it is sufficient that the laminated film has strength enough to withstand distribution and storage. In addition to the configuration, other films such as biaxially oriented nylon, biaxially oriented polyester, and biaxially oriented polypropylene can be laminated.

As shown in FIGS. 2 and 3, the present laminated film has a great feature in that the scar group 3 is continuously provided in the longitudinal direction. The scar group 3 is constituted by a large number of short notches 4 arranged in a row. The scar group 3 has a crack that progresses in the lateral direction indicated by an arrow A in FIGS. 2 and 3.
Is reached, the vehicle is guided to change its direction into an L-shape in the vertical direction indicated by an arrow B. Each notch 4 is a fine short line having a length longer than the width, and has a length of 1.0 m.
m or less, and a length of 0.5 to
It is particularly preferred that it is 0.1 mm. Further, it is preferable that the width of each notch 4 is narrower, since both ends of each notch 4 become acute and the propagation direction of the notch is easily guided.

Each of the cuts 4 constituting the scar group 3 is formed such that a rift which advances in the horizontal direction is bent into an L-shape and is directed in a direction which is easy to be guided continuously in the vertical direction.
Specifically, for example, as shown in FIG.
Can be formed in a dashed form along the vertical direction. That is, the cuts 4 are formed side by side without being inclined along the vertical direction. Further, as shown in FIG. 3, the cuts 4 inclined at an angle of ± 45 ° or less with respect to the vertical direction can be formed so as to be arranged in the vertical direction. In this case, ± 45 °
If the angle range exceeds the range, the tear easily crosses the scar group 3. In the case of the former mode, it is easy to prevent the rip that progresses in the lateral direction from passing through the scar group 3 as it is. In the latter case, it is easy to reduce the resistance transmitted to the fingers when the rift that progresses in the horizontal direction is turned in the vertical direction.

It is preferable that a plurality of rows of the cuts 4 constituting the scar group 3 are formed in order to ensure the direction change of the rip. Specifically, it is preferable to form the scar group 3 having a width of about 4 mm to about 10 mm including four to ten rows of the cuts 4. Further, when forming a plurality of rows of the cuts 4 in the form of broken lines along the vertical direction, if the cuts 4 are formed in a staggered manner as shown in FIG. Be certain. Further, when forming a plurality of rows of cuts 4 inclined at an angle of ± 45 ° or less with respect to the vertical direction, as shown in FIG. 3, the cuts adjacent to each other in the horizontal direction have a C shape or an inverted C shape. When formed in a straightforward manner, the turning of the rift is still more reliable.

The scar group 3 is formed continuously in the vertical direction at a position corresponding to a place where an opening line is desired when the laminated film is formed into a packaging bag. 2 and 3, one scar group 3 is provided, but two or more scar groups 3 may be provided. The formation of the scar group 3 is performed, for example, by continuously pressing the film through a film between a metal disk having a large number of protruding blades formed on the outer peripheral surface and a receiving roll coated with rubber. Can be.

When the packaging bag formed by using the laminated film is to be used for packaging contents that are unlikely to deteriorate in quality due to moisture absorption, drying, oxidation and the like, the scar group 3 is applied to the laminated film, It can be formed as an aggregate of cuts 4 penetrating the laminated film. However, since the notch 4 of the scar group 3 in the present laminated film is sufficient if it is formed at least in the uniaxially stretched film 1, generally, after forming the scar group 3 in the uniaxially stretched film 1 in advance,
It is preferable to laminate the heat-sealable resin layer 2 by a method such as an extrusion lamination method or a dry lamination method. In this way, the cuts 4 forming the scar group 3 can be covered or filled with the heat-sealing resin, and the sealing performance of the obtained packaging bag can be improved. When the biaxially stretched film is used in addition to the uniaxially stretched film 1, it is preferable that the heat sealable resin layer 2 is similarly laminated after forming the scar group 3 on a laminated film obtained by laminating the two. Incidentally, at least each cut 4 of the scar group 3 formed in the uniaxially stretched film 1 is usually formed so as to penetrate the uniaxially stretched film 1, but is not penetrated as long as it does not prevent tearing by fingers. You may.

The laminated film is formed into a packaging bag having a shape such as a three-side seal bag, a four-side seal bag, and a pillow bag.
The film is particularly suitably used for a pillow type packaging bag including a gusset type in which both ends in the width direction of the film are sealed together to form a cylindrical shape, and the openings at both ends of the cylindrical shape are sealed and closed.

Hereinafter, the packaging bag according to the present invention will be described.

FIG. 4 is a perspective view showing a first example of the packaging bag according to the present invention, and FIG. 5 is a perspective view showing the opened state of the packaging bag.

The present packaging bag is a packaging bag in which both ends in the lateral direction (width direction) of the above-mentioned laminated film are sealed to form a cylinder, and the openings at both ends of the cylindrical body are sealed. 5 in the figure
Is the joint seal portion, 6 and 7 are the end seal portions, and the scar group 3
Is formed on one side of the same surface as the joint palm seal portion 5 and V-shaped on the joint seal portion 5 located substantially at the center.
An opening start point 8 by the notch is formed.

The opening of the packaging bag is carried out by gripping the palm seal portion 5 with fingers and tearing it laterally from the opening start point 8. When the rift that progresses in the lateral direction reaches the scar group 3, the notch 4 located there (see FIGS. 2 and 3)
As a result, it is bent in an L-shape and turned in the vertical direction, so that the rift proceeds along the scar group 3. Therefore, FIG.
As shown in (2), the packaging bag can be cut open in an L-shape and opened, and the contents can be easily taken out.

FIG. 6 is a perspective view showing a second example of the packaging bag according to the present invention, and FIG. 7 is a perspective view showing the opened state of the packaging bag.

The present packaging bag is basically the same as the above-mentioned first example, except that two opening start points 8 are provided.

By doing so, by tearing from both opening start points 8, the packaging bag can be cut open in a U-shape and opened as shown in FIG. 7, and a wider opening area can be obtained.

FIG. 8 is a perspective view showing a third example of the packaging bag according to the present invention, and FIG. 9 is a perspective view showing the opened state of the packaging bag.

This packaging bag is provided with two opening start points 8, and has a scar group 3 formed on both sides of the palm seal portion 5.

By doing so, by tearing from both opening start points 8, a part of the packaging bag can be cut into a square shape and opened as shown in FIG. In addition, by adjusting the interval between the two scar groups 3, the size of the opening formed by opening can be adjusted.

FIG. 10 is a perspective view showing a fourth example of the packaging bag according to the present invention, and FIG. 11 is a perspective view showing the opened state of the packaging bag.

The present packaging bag is provided with one opening start point 8, and has a group of scars 3 formed on both sides of the palm seal portion 5.

By doing so, the packaging bag can be cut open in a U-shape as shown in FIG. 11 and then opened by tearing from both opening start points 8.

In any of the examples, the opening start point 8 may be a simple notch in addition to the V-notch shown in the figure, and further intersects the edge along the edge of the joint seal portion 5. It can also be provided as a large number of short notches provided in the direction. When the opening start point 8 is provided as the fine cut, opening can be started from any position of the palm seal portion 5. Further, a display indicating the opening start point 8 and the tear opening direction by an arrow or the like may be printed.

[0033]

Example 1 A 30 μm-thick uniaxially stretched polypropylene film having a thickness of 25 μm (“YT22” manufactured by Toray Industries, Inc.)
Was laminated by extrusion to obtain a laminated film having a thickness of 55 μm. Next, this laminated film was slit to a width of 220 mm.

On the other hand, on the outer peripheral surface of a metal disk having a diameter of 80 mm and a thickness of 8 mm, the length direction is parallel to the circumferential direction of the disk, and the cutting edge width is 0.5 mm and the height is 0.45 mm. A fine, protruding blade having a sharp tip with a pitch of 1 mm in the thickness direction of the disc and a pitch of 0.5 in the circumferential direction of the disc.
The rows were arranged in a zigzag pattern in seven rows so as to be mm.

Two such metallic disks are arranged so that the center line of the band where the protruding blades are formed is 20 mm from both edges of the slit laminated film having a width of 220 mm, and a rubber coating that rotates together with the disks. The laminated film was passed between the receiving rolls, and continuously pressed by the disk and the receiving roll, thereby forming two scratches in the longitudinal direction of the laminated film. The cuts in each scar group were parallel broken lines along the longitudinal direction of the laminated film, and were arranged in seven rows in a staggered manner. The width of each scar group was 6 mm.

According to the obtained laminated film, FIG.
A packaging bag as described in 11 was formed. When the packing bag is picked up at the gasket seal part and torn laterally from the opening start point, when the tear opening end reaches the scar group,
It was examined whether the direction was changed in the longitudinal direction along the scar group. As a result, the opening progresses smoothly in the horizontal direction first along the orientation direction of the horizontal uniaxially stretched film, and when the opening tearing tip reaches the position of the scar group, the opening direction in the longitudinal direction along the scar group at that position. Has been changed so that it can be easily opened in a U-shape.

Comparative Example 1 A laminated film having a scar group having a width of 6 mm was obtained in the same manner as in Example 1 except that a biaxially oriented polypropylene film was used instead of the transverse uniaxially oriented polypropylene film.
The opening performance was examined in the same manner as in Example 1. As a result, there was no problem with the cut-out property at the start of opening.However, the opening direction proceeded in either direction due to the delicate way of applying force, and it was not constant and bent, so the tearing open end reached the wound group. Even when guided in the vertical direction, a wide opening could not be obtained, a crack that should progress in the horizontal direction did not reach the scar group, or it was easy to proceed straight across the scar group .

Example 2 A biaxially oriented polyester film having a thickness of 12 μm was further laminated on the side of the uniaxially stretched polypropylene film of the two-layer laminated film of Example 1 by a dry laminating method. A laminated film having a scar group with a width of 6 mm was obtained in the same manner as in Example 1 except that the laminated film had a layer structure. Example 1 of this laminated film
When the opening performance was examined in the same manner as in Example 1, the same results as in Example 1 were obtained.

Example 3 On a circumferential surface of a metal disk having a diameter of 80 mm and a thickness of 8 mm,
The disk provided with the protruding blades in the following A or B arrangement was used.

A: Blade edge width is 0.5 mm and height is 0.4
mm, a fine projection blade with a sharp tip, with a circumferential pitch of 3 mm and a length direction of + 30 ° with respect to the circumferential direction of the disk
The inclined row and the row inclined at −30 ° are alternately arranged in six rows at an interval of 1.5 mm in the thickness direction of the disk, and the adjacent protruding blades in the thickness direction of the disk form a C shape. Array.

B: The same arrangement as A except that the protruding blades adjacent in the thickness direction of the disk form an inverted C shape.

A laminated film was obtained in the same manner as in Example 1 using two metal disks having the protruding blades in the arrangement of A or B. The cut in each scar group is +30 in the vertical direction.
It was inclined at 30 ° or −30 °, and the cuts adjacent to each other in the lateral direction were formed in a C shape or an inverted C shape. The width of each scar group was 4 mm.

Example 1 of the obtained laminated film
When the opening performance was examined in the same manner as in Example 1, the same results as in Example 1 were obtained.

Example 4 A 20 μm-thick uniaxially stretched high-density polyethylene film (“Calarian Y” manufactured by Toyo Chemical Co., Ltd.) was used.
In the same manner as described above, a scar group having a width of 6 mm was provided in advance. A linear low-density polyethylene resin having a thickness of 35 μm is extruded and laminated from the T-die on the film with the scars, and the film having a thickness of 55 μm is formed.
A μm laminated film was obtained.

Example 1 of the obtained laminated film
When the opening performance was examined in the same manner as in Example 1, the same results as in Example 1 were obtained.

[0046]

According to the laminated film of the present invention, it is possible to easily obtain a packaging bag capable of forming a large opening by making a large cut with a finger at the time of opening. In addition, the packaging bag of the present invention formed of the laminated film of the present invention can form a large opening by making a large cut with fingers.
The contents can be easily taken out without breaking or breaking.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a laminated film for easily tearable packaging bags according to the present invention.

FIG. 2 is a plan view showing an example of a laminated film for an easily tearable packaging bag according to the present invention.

FIG. 3 is a plan view showing another example of the laminated film for an easily tearable packaging bag according to the present invention.

FIG. 4 is a perspective view showing a first example of a packaging bag according to the present invention.

FIG. 5 is a perspective view showing an opened state of the packaging bag shown in FIG. 4;

FIG. 6 is a perspective view showing a second example of the packaging bag according to the present invention.

FIG. 7 is a perspective view showing an opened state of the packaging bag shown in FIG. 6;

FIG. 8 is a perspective view showing a third example of the packaging bag according to the present invention.

FIG. 9 is a perspective view showing an opened state of the packaging bag shown in FIG. 8;

FIG. 10 is a perspective view showing a fourth example of the packaging bag according to the present invention.

11 is a perspective view showing an opened state of the packaging bag shown in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Uniaxially stretched film 2 Heat-sealable resin layer 3 Scar group 4 Notch 5 Joint seal part 6 End seal part 7 End seal part 8 Opening start point

Claims (7)

[Claims] 1. A laminated film comprising a uniaxially stretched film uniaxially stretched and a heat-sealable resin layer,
A laminated film for an easily tearable packaging bag, wherein a group of scars in which short linear fine cuts are arranged in a row are continuously provided at least in a longitudinal direction on a uniaxially stretched film. 2. The method according to claim 1, wherein the rows of short-line fine notches form a dashed shape along the vertical direction.
Laminated film for easily tearable packaging bags. 3. The easily tearable packaging volume layer film according to claim 2, wherein a plurality of rows of short linear fine cuts are formed by staggering the cuts. 4. The method according to claim 1, wherein the rows of short-line fine cuts are formed by arranging cuts formed obliquely at an angle within ± 45 ° with respect to the vertical direction in the vertical direction.
Laminated film for easily tearable packaging bags. 5. The easy tearing method according to claim 4, wherein a plurality of rows of short-line fine cuts are provided, and the cuts adjacent to each other in the lateral direction form a C shape or an inverted C shape. Film for flexible packaging bags. 6. The laminated film for an easily tearable packaging bag according to any one of claims 1 to 5, wherein both ends in the lateral direction are sealed with a palm and sealed to form a tube, and the openings at both ends of the tube are sealed and closed. What is claimed is: 1. A packaging bag, wherein an opening start point is provided in a joint seal portion, and a group of scars is located on a surface on the same side as the joint seal portion. 7. The packaging bag according to claim 6, wherein the scar group is located on both sides in the lateral direction with the palm joint portion therebetween.