JP2518858Z - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag which can be easily opened from a bent portion of the packaging bag. 2. Description of the Related Art A commonly used packaging bag made of a composite film obtained by laminating a polyethylene film on cellophane, paper, or the like can easily open the heat seal surface by hand without using a cutter. Therefore, its use is also wide-ranging, but this type of packaging bag has a low breaking strength and, in particular, lacks moisture-proof properties, so that the contents to be enclosed are limited. Therefore, a packaging bag has been developed using a plastic laminated film as a packaging bag material, increasing the breaking strength, improving the moisture resistance, and reducing the restrictions on the contents to be enclosed. [0003] A molded packaging bag using a plastic laminated film as a packaging bag material is difficult to open by hand due to the high tear strength of the plastic laminated film as the packaging bag material. A cutting tool such as a cutter is required. Since it is troublesome to prepare a cutting tool such as a cutter in advance for opening a packaging bag formed of a plastic laminate film, without using a cutting tool such as a cutter,
There is a demand from users for a packaging bag that can be easily opened by hand. By providing a V-shaped notch or an I-shaped notch in the heat-sealing portion of the packaging bag, the V-shaped notch or the I-shaped notch can be used as an opening introduction portion. A packaging bag that facilitates opening from the seal was made. As in the packaging bag disclosed in US Pat. No. 3,608,815, an opening assisting area is formed by penetrating a pin in one stretched plastic film, and the opening assisting area is formed by the opening assisting area. The packaging bag folded and formed so as to be located at the bent portion of the above, or two stretched plastic films formed with the opening assisting area by penetrating the pin, are shifted in position of the pin through hole in the opening assisting area. 2. Description of the Related Art Packaging bags are known which are formed by laminating a plastic laminate film formed by lamination such that an opening assisting area is located at a bent portion of the packaging bag. [0005] A material obtained by cutting a plastic laminate film into a rectangular shape is folded into two to obtain 3
By providing a V-shaped notch or the like in the heat-sealed portion, the packaging bag whose one end is heat-sealed can be easily opened from the heat-sealed portion. In the case of a packaging bag of this type, when the packaging bag is manufactured by a packaging material processing manufacturer and delivered to the user, the packaging material processing manufacturer performs a notch process on the heat-sealed portion of the bag at the stage of forming the packaging bag. There is no problem in providing a V-shaped notch etc. in the heat seal part, but the packaging material processing manufacturer supplies the user with the roll-shaped packaging material and performs the molding of the packaging bag. When the filling is performed while filling the contents with the material filling machine, it is difficult to perform the notch processing on the heat seal portion of the packaging bag. A packaging bag provided with an opening assistance area by penetrating a pin in one stretched plastic film can be easily opened by hand without the need for a cutting tool such as a cutter, but is refilled by opening. The through-holes provided in the area increase the moisture permeability and oxygen permeability of the packaging bag.For example, if a product that prevents moisture, such as coffee powder or rice cracker, is enclosed, the product will lose moisture. It becomes absorbed and depleted,
It cannot be used as a packaging bag for enclosing a product that does not allow moisture, and the enclosing product is limited. A packaging bag formed of a plastic laminate film obtained by laminating two stretched plastic films by displacing the positions of the pin through holes in the opening assist area provided in the stretched plastic film may be able to solve the above-mentioned difficulties. ,
In this type of packaging bag, it is difficult to position the pin through-hole of the stretched plastic laminated film to be laminated, and even if the opening assist area formed by the pin through-hole is provided in the folded portion of the packaging bag, It is difficult to open the area as an opening introduction part. The present invention has been made in view of the above points, and a plastic laminate film formed by laminating a stretched plastic film having a roughened surface portion and a non-porous unstretched plastic film is used for opening a rough plastic film. By folding and forming the surface portion so as to be located at the bent portion of the packaging bag, and using the rough opening portion for opening formed on the side edge of the packaging bag as an opening introduction portion, by breaking an unstretched plastic film having a characteristic that is difficult to tear,
An object of the present invention is to provide a packaging bag that can be easily opened from a bent portion formed on a side edge of the packaging bag. [0008] The packaging bag of the present invention is formed by bending a plastic laminate film having a rectangular shape, and heat-sealing the joining end to form a cylindrical portion. In the pillow-type packaging bag in which the open end is heat-sealed, the above-mentioned plastic laminated film is opened with a predetermined width and a predetermined length, and a stretched plastic film provided with a rough surface portion having a through-hole and a non-porous unstretched plastic film are opened. This plastic laminated film is formed by laminating so as to form a roughened surface portion, and the stretched plastic film is bent outside so that the roughened surface portion for opening is located only at the bent portion of the packaging bag . The bent portion is formed on a side edge of the packaging bag, and a back surface of the packaging bag. In the packaging bag of the present invention, the opening rough surface portion is formed by a rough surface portion formed by at least a through hole provided in a stretched plastic film and an extrusion laminating means filled in at least the through hole of the rough surface portion. It can be composed of a plastic material containing an anchoring agent when forming a plastic laminate film, and
The rough surface portion of the stretched plastic film can be formed by making the surface of the stretched plastic film rough by pressing with sandpaper. [0010] In the packaging bag of the present invention, the opening rough surface portion formed by covering the rough surface portion provided on the stretched plastic film with the smooth surface of the non-porous unstretched plastic film is bent at the bent portion of the packaging bag. Is positioned on the side of the packaging bag provided on the stretched plastic film.
The unstretched plastic film, which is difficult to tear, can be broken using the rough opening portion of the edge as an opening introduction portion, thereby easily opening the packaging bag from the bent portion. Further, in the packaging bag of the present invention, at least the through-hole of the rough surface portion provided on the stretched plastic film is filled with a plastic material to thereby improve the moisture permeability and oxygen permeability of the rough surface portion for opening. Growth can be prevented, so that the contents to be enclosed are hardly restricted. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example in which a packaging bag according to the present invention is applied to a pillow-type packaging bag 1. This pillow-type packaging bag 1 has a rectangular plastic laminate film 2 and bonding ends 3, 3 at the rear center. Is formed by heat-sealing the joining ends 3 and 3 to form a cylindrical portion, and heat-sealing the open end of the cylindrical portion. As shown in FIG. 2, the plastic laminate film 2 is made by extruding a biaxially oriented polypropylene film 4 having a thickness of 20 μm and laminating it with a polyethylene film 5 having a thickness of 40 μm by extrusion laminating means. . That is, the plastic laminate film 2 is formed by the biaxially stretched polypropylene film 4 and the unstretched polyethylene film 5. When the pillow-type packaging bag 1 formed of the plastic laminate film 2 is to be opened linearly, it is desirable to change the biaxially stretched polypropylene film of the plastic laminate film 2 to a uniaxially stretched polypropylene. As shown in FIG. 1, a rough opening portion 6 for opening is formed in a bent portion 1 a located on a side edge of the pillow-shaped packaging bag 1. The rough surface portion 6 for opening is located at a position corresponding to the bent portion 1a of the packaging bag 1 when the plastic laminated film 2 having a predetermined size is bent and formed to form the pillow-shaped packaging bag 1. The rough surface portion 6 for opening is 2
A rough surface portion 9 having a predetermined width and a predetermined length formed by a plurality of recesses 7 and through holes 8 formed by pressing an abrasive surface onto one surface of the axially stretched polypropylene film 4;
And a plastic material 10 filling the through-hole 8. The plastic material 10 is filled in the recesses 7 and the through holes 8 of the rough surface portion 9 when the plastic film 2 is formed by extruding and laminating the polyethylene film 5 on the biaxially stretched polypropylene film 4 using an extrusion laminating means. You. The plastic material 10 also includes an anchor applied to the surface of the biaxially oriented polypropylene film 4 during extrusion lamination. The rough surface portion 9 formed on the biaxially stretched polypropylene film 4 is formed by a rough surface forming device 11 shown in FIG. The rough surface forming device 11 includes a metal roll 12, a rough surface forming roll 12a elastically contacting the metal roll 12, and a sandpaper 13 having a grain size of 100 wound around the rough surface forming roll 12a. By passing the axially stretched polypropylene film 4 between the metal roll 12 and the rough surface forming roll 12a, the sandpaper 13 wound around the rough surface forming roll 12a is pressed against one surface of the biaxially stretched polypropylene film 4, and this is pressed. As a result, a rough surface portion 9 composed of a concave portion 7 and a through hole 8 corresponding to a grain size of 100 of the sandpaper 13 is formed on one surface of the biaxially stretched polypropylene film 4. The opening rough surface portion 6 of the plastic laminate film 2 is formed in the concave portion 7 and the through hole 8 of the rough surface portion 9 formed in the biaxially stretched polypropylene film 4 and the polyethylene material 10 of the polyethylene film 5 extruded and laminated. The rough surface portion 6 for opening has a smooth surface in appearance. Opening rough surface 6
The plastic laminated film 2 provided with the above does not significantly increase the moisture permeability and the oxygen permeability as compared with a packaging bag having the same configuration without the opening rough surface portion. Therefore, the packaging bag formed of the plastic laminate film 2 provided with the rough surface portion 6 for opening can enclose contents restricted by moisture or the like. In the pillow-shaped packaging bag 1 shown in FIG. 1, a bent portion 14 is also formed at a position adjacent to the joining end portion 3 at the center of the back surface, and the bent portion 14 is formed at the bent portion 1a. An opening rough surface portion 15 similar to the formed opening rough surface portion 6 is formed. That is, the plastic laminated film 2 constituting the pillow-shaped packaging bag 1 is formed by joining the bent portion 1a formed on the side edge of the pillow-shaped packaging bag 1 when the pillow-shaped packaging bag 1 is bent and formed at the center of the back surface. Bent portion 1 formed at a portion adjacent to 3
4 has a rough surface portion 6 for opening and a rough surface portion 15 for opening. When the pillow-shaped packaging bag 1 is opened in the direction of the arrow in FIG. 1, the opening rough surface portion 6 having a predetermined width is located at the mountain-folded bent portion 1 a located on the opening start end side, and has a predetermined width. The opening roughened surface portion 15 is a bent portion 14 that is mountain-folded among the bent portions of the joint end 3.
Located in. When the pillow-type packaging bag 1 is opened in the direction of the arrow in FIG. 1, the valley-folded bent portion 1b can be easily opened during the opening of the pillow-type packaging 1 in the direction of the arrow. It is not necessary to provide the opening rough surface portion in the valley-folded bent portion 1b . The measurement results of the moisture permeability of the biaxially stretched polypropylene film 4 of the plastic laminate film 2 constituting the pillow-shaped packaging bag 1 are shown in the table below. [Table 1] (Note) The material is a laminated film of a biaxially oriented polypropylene film with a thickness of 40 microns, and the enclosed content is calcium chloride. According to the measurement result of the moisture permeability, the rough surface portion 9 is formed at the bent portion of the pillow-shaped packaging bag 1. When formed, the moisture permeability increases, but by filling the through-holes of the rough surface portion 9 with a polyethylene material, there is not much difference in the moisture permeability even when compared with a packaging bag without the rough surface portion 9, so that a product that prevents moisture can be obtained. Can also be used. Further, although the laminated film in which the plastic material is filled in the rough surface portion 9 has a lower tensile strength and elongation than the laminated film without the rough surface portion, the pillow-type packaging bag made of this material is subjected to a pressure test, There was no significant difference between the two in the drop test. However, when the pillow-type packaging bag 1 is opened in the direction of the arrow in FIG. 1, the opening rough surface portion 6 having a predetermined width is positioned at the mountain-folded bent portion 1a located on the opening start end side. And
Since the opening rough surface portion 15 having a predetermined width is located at the bent portion 14 of the bent portion of the joining end portion 3 which is to be mountain-folded, the stretched plastic portion is opened when opening in the direction of the arrow from the opening start end side. By breaking the unstretched plastic film that is difficult to tear using the opening rough surface portion provided in the film as an opening introduction portion, the bent portion 1a can be easily formed by hand without requiring strong force, and The extended cutting line reaches the center of the back surface and reaches the protruding joint end 3 which is difficult to open. The joining end 3 is also easily opened by the face portion 15, and the cutting line that cuts the joining end 3 is located on the opposite side to the mountain-folded bent portion 1 a located on the opening start end side from the joining end 3. or linearly extending to the mountain fold the bent portion 1c , It is possible to open the pillow-shaped packaging bag 1 in a straight line. FIG. 5 shows an embodiment in which the present invention is applied to a gusset bag. The gusset bag 20 has gusset portions 21a and 21b folded inward on both sides, and is folded inside the gusset portion 21a located on the opening start end side in the cutting direction (arrow) for opening. The bent portions 22 and 23, the bent portion 24 located inside the other gusset portion 21 b, and the bent portion 26 which is mountain-folded in the opening direction of the joining end 25 projecting outward,
Opening rough surface portions 22a , 23a, 24a, 26a are formed. This facilitates the opening of the joint end protruding outward which is difficult to open. Further, in the above embodiment, the opening rough surface portion is provided in the entire bent portion of the packaging bag 1 to be opened. However, the opening rough surface portion may be provided only in the portion to be opened. Of course, it may be of a layered structure. As described above, according to the present invention, according to the present invention, a stretched plastic film having a rough surface portion having a through hole with a predetermined width and a predetermined length and a non-porous unstretched plastic film are provided. The plastic laminated film is formed by laminating the opening so as to form a rough surface portion, and the plastic laminated film is folded so that the stretched plastic film is on the outside and the opening rough surface portion is located only at the two bent portions of the packaging bag. Opening provided on the side edge of the packaging bag provided on the stretched plastic film by molding
By tearing the unstretched plastic film that is difficult to tear using the rough surface for opening as the opening introduction part, the packaging bag can be easily opened from the bent part, and the back of the packaging bag can be opened.
By forming the opening rough surface at the center, the joint end can also be cut smoothly. In addition, by covering the rough surface provided on the stretched plastic film with the smooth surface of the unstretched plastic film, the moisture permeability and oxygen permeability of the opening rough surface are prevented from increasing, so that the product sealed in the packaging bag is restricted. I do not receive.

[Brief description of the drawings]     FIG.   The figure which shows the example which applied the packaging bag by this invention to the pillow-type packaging bag 1. FIG.     FIG. 2   Sectional drawing of the plastic film of a packaging bag material.     FIG. 3   Sectional drawing of the site | part which provided the rough surface for opening of the same plastic film.     FIG. 4   The figure which shows a rough surface forming apparatus.     FIG. 5   FIG. 4 is a diagram showing another embodiment of the present invention.     [Explanation of symbols]   1 packaging bag   1a Bending part   2 Plastic laminate film   3 joining end   4 Biaxially oriented polypropylene film   5. Non-porous unstretched polyethylene film   6 Rough surface for opening   7 recess   8 Through hole   9 Rough surface   10 Plastic materials   15 Rough surface for opening

Claims (1)

[Claim 1] A plastic laminate film having a rectangular shape is formed by bending, a joining end portion is heat-sealed to form a cylindrical portion, and an opening end of the cylindrical portion is heat-sealed. in the pillow packaging <br/> Sobukuro, the plastic laminate film, in a predetermined width, a predetermined length of
It is constituted by laminating a stretched plastic film provided with a roughened surface portion having a through hole and a non-porous unstretched plastic film so as to form a roughened surface portion for opening. , the rough surface portion is bent shaped so as to be located only in the bent portion of the packaging bag opening, the folding
The bent portion is formed on the side edge of the packaging bag and the joint formed on the back surface of the packaging bag.
end 2. A plastic laminated film is formed by an extrusion laminating means in which a rough surface portion for opening is formed by at least a through hole provided in a stretched plastic film and at least a through hole of the rough surface portion is filled. 2. The packaging bag according to claim 1, wherein the packaging bag is made of a plastic material containing an anchoring agent. 3. The packaging bag according to claim 2, wherein the roughened surface of the stretched plastic film is formed by pressing a sandpaper.