JP3578419B2 - Packaging bag - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a packaging bag, and more particularly, to a packaging bag for packaging a case such as a travel watch, a calculator, and an instant camera.
[0002]
[Prior art]
In recent years, precision housings such as travel watches have been densely packaged and sold in gusset-shaped packaging bags as shown in FIG. 4 in order to protect their quality. In the gusset-shaped packaging bag, both ends of a single laminated sheet are bonded together by heat sealing, and the back bonding seal portion 2 is formed so as to protrude outward to form a cylindrical body. A pair of notches 2b, 2b are formed at desired positions of the back pasting seal portion 2, and a knob 2a is provided between the notches. The back pasting seal portion 2 is disposed substantially at the center of the back portion 5, and the upper end openings of the front portion 6 and the back portion 5 are pasted together by heat sealing to form the header portion 10, and the packaging bag 100 is obtained. After the packaging bag 100 is formed, a housing such as a travel watch is put into the packaging bag 100. Thereafter, the lower end openings of the front part 6 and the back part 7 are bonded together by heat sealing to form the foot part 14 to complete the packaging. In addition, the header part 10 is formed with a hole part 11 for hanging and displaying a packaging bag in which contents are packaged. In order to open the package, the user holds the packaging bag 100 with one hand, grips the knob 2a with the other hand, and pulls it in the direction of the arrow A. The back part 5 is torn.
[0003]
In FIG. 4, 13ab, 13bc, 13de, and 13ef are lower end wings formed by heat-sealing sheets folded in a gusset shape. The foot portion 14 is formed by bonding the region and the region between the lower end wing portions 13bc and 13ef of the front surface portion 6 to each other by heat sealing.
[0004]
As another conventional example of a packaging bag for housing items, there is a case in which a tearing tape, which is higher in strength than the packaging sheet, is attached to the opening portion, such as a cigarette package, to improve the opening property. . When the pinching force is applied to the free end of the tear tape, the packaging sheet is torn along the tear tape and opened.
[0005]
[Problems to be solved by the invention]
In this case, in the packaging bag shown in FIG. 4, the back pasted seal portion 2 is a joint portion formed by heat sealing of the laminate sheet, and thus has higher strength than the back surface portion 5. Therefore, there is a difference in strength in the bent base portion 20a, and a break is to be started using the portion. However, the laminate sheet itself generally has high strength, and it takes a great deal of effort to tear off the bent base portion 20a of the back pasting seal portion 2. In some cases, the opening does not start at the portion, which has been a problem in opening. In particular, since the hard casing is tightly packed without any gaps, the opening operation is hindered by the casing as the contents, making the opening operation more difficult.
[0006]
Further, the packaging using the tear tape requires a tear tape as a packaging material, and requires a step of pasting the tear tape at a predetermined position in advance, which has a disadvantage that the manufacturing process is complicated.
[0007]
Therefore, an object of the present invention is to provide a packaging bag that can be easily opened and does not require a complicated packaging step, and that tightly packages a housing object.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a front part, a back part, and a pair of side parts for connecting these parts by bending a single laminated sheet made of a laminated film, and a front part. The upper end of the back portion is welded to form a header portion, the lower end portion of the front and back portions is welded to form a foot portion, and a back sticker extending from the header portion to the foot portion is formed on the back portion. Part is formed so as to protrude, and a pair of cutouts are formed in the back pasting seal portion to form a knob at the time of opening. A packaging bag is provided in which a film around the bent base has a roughened portion.
[0009]
[Action]
According to the packaging bag of the present invention having the above configuration, when the packaging bag is gripped with one hand, and the grip portion is gripped with the other hand and pulled in the lateral direction, the bent base portion of the back adhesive seal portion opposite to the opening direction is bent. Since the peripheral part is roughened and has low strength, tearing is easily started from the part.
[0010]
【Example】
A packaging bag according to an embodiment of the present invention will be described with reference to FIGS. In the drawings, the same parts as those of the conventional packaging bag 100 are denoted by the same reference numerals.
[0011]
FIG. 1 shows the packaging bag 1 of this embodiment in a state before a housing as a content is inserted. The left and right end portions of one laminated sheet made of the laminated films are bonded together by heat sealing to form a back bonding seal portion 2 to form a cylinder having an upper end opening and a lower end opening 8. As a result, the back pasted seal portion 2 is formed so as to protrude from the bent base portion 20a and extend outside the cylindrical body from the upper end opening to the lower end opening 8. A pair of notches 2b, 2b are formed in the back pasting seal portion 2, and a knob 2a is provided between the notches.
[0012]
Six folding lines 3a, 3b, 3c, 3d, 3e, 3f for gusset configuration are formed in this cylindrical body. The area between the fold lines 3c and 3f constitutes the front part 6 of the gusset, and the area between the fold lines 3a and 3d constitutes the back part 5. The areas between the fold lines 3a and 3b and the areas between the fold lines 3b and 3c constitute folds 4ab and 4bc, respectively, and these folds constitute the side faces 4 of the gusset. Similarly, the regions between the folding lines 3d and 3e and between the folding lines 3e and 3f constitute folding portions 4de and 4ef, respectively, and these folding portions constitute side portions 4 '. The positions of the folding lines 3a to 3f are selected such that the back-sticking seal portion 2 extends substantially in the center of the back surface portion 5.
[0013]
Next, the upper end portion of the folded portion 4ab and the region of the rear portion 5 opposed thereto are bonded by heat sealing to form the upper end wing portion 9ab, and the upper end portion of the folded portion 4de and the region of the rear portion 5 opposed thereto are formed. Are bonded together by heat sealing to form an upper end wing 9de. Similarly, the area of the front part 6 facing the upper ends of the folded parts 4bc and 4ef is bonded by heat sealing to form upper end wings 9bc and 9ef. The header section 10 is formed by bonding a region between the upper wing portions 9ab and 9de of the rear portion 5 and a region between the upper wing portions 9bc and 9ef of the front portion 6 by heat sealing.
[0014]
Thereafter, a hole 11 is formed in the header 10. At this time, a region corresponding to the hole 11 in the back-sealing seal portion 2 is also removed. When selling a case such as a travel watch enclosed in the packaging bag 1, a horizontally extending rod-shaped member (not shown) is inserted into the hole portion 11 of the header portion 10 to suspend the packaging bag.
[0015]
After the header portion 10 is formed, the fold lines 3b and 3e are expanded to provide the side portions 4 and 4 ', and a casing such as a travel watch is inserted into the packaging bag 1 through the lower end opening 8. Thereafter, in the same manner as the formation of the upper end wings 9ab, 9bc, 9de, 9ef, the lower ends (near the lower end opening 8) of the folded parts 4ab and 4bc, 4de, 4ef and the rear part 5, which faces these, The entire surface portion 6 is bonded to form a lower end wing portion (corresponding to 13ab, 13bc, 13de, 13ef in FIG. 4) and a foot portion (corresponding to 14 in FIG. 4). Thus, the housing is sealed in the packaging bag 1.
[0016]
The laminated sheet used for the packaging bag in this embodiment is a polyester film 15 having a thickness of 12 μm as an outer layer, an ethylene vinyl acetate film 16 having a thickness of 30 to 60 μm, preferably 40 μm as an inner layer, and a thickness of 7 to 12 μm as an intermediate layer. A 7 μm aluminum foil 17, a polyethylene film 18 having a thickness of 15 to 20 μm, preferably 20 μm provided between the inner layer 16 and the aluminum foil 17, and a 15 to 20 μm preferably 15 μm thickness provided between the aluminum foil 17 and the outer layer 15. And a polyethylene film 19. Here, the outer layer polyester film 15 has a characteristic of high strength and small elongation, so that it is suitable for printing as an outer layer. The aluminum foil 17 is for ensuring gas barrier properties. The ethylene vinyl acetate film 16 of the inner layer has a high heat sealing property and is for ensuring the sealing property. The polyethylene films 18 and 19 are for adhesion between the inner layer 16 and the aluminum foil 17 and between the aluminum foil 17 and the outer layer 15.
[0017]
A roughened surface 15a is formed in advance around the bent base 20a on the side opposite to the opening direction A of the back pasting seal portion 2 of the polyester film 15 as the outermost layer of the laminate sheet. When the polyester film is roughened, the mechanical strength is reduced as compared with the unprocessed portion, and the polyester film is easily broken. The rough surface processing is to press the polyester film 15 with a rough roller to form a concave portion or a through hole in the film. When laminating the roughened polyester film 15 and the aluminum foil 17 surface, the molten polyethylene used as an adhesive penetrates into the recesses or through holes of the polyester film to fill the recesses and through holes and smoothes the polyester surface. I do. For this reason, the appearance of the outer surface is maintained. The roughened portion 15a is formed at least at a position corresponding to the knob 2a. For convenience in manufacturing, the entire bent base portion 20a extending from the header portion 10 to the foot portion 14 may be roughened. Thus, when forming the cutouts 2b, 2b, it is not necessary to carefully consider the cutout forming position.
[0018]
FIG. 3 is a view showing the opened state of the casing packaging bag. At the time of opening, the bag 1 is gripped with one hand, and the knob 2a is pulled in the opening direction A with the other hand. Then, the polyethylene film 15 is broken and opened at the bent base 20a of the knob 2a on the opposite side to the opening direction. Here, since the roughened surface portion 15a is formed in the bent base portion 20a, the pulling of the knob 2a easily causes breakage in the roughened surface portion 15a, thereby facilitating opening. Since the polyester film having the highest strength among the films constituting the laminate sheet has been opened, the other films are subsequently opened.
[0019]
【The invention's effect】
According to the packaging bag of the present invention described above, by pulling the knob in a predetermined direction with a predetermined force or more, the packaging bag can be easily opened at the roughened surface. Therefore, even a packaging bag tightly enclosing a rigid object that is difficult to open can be easily and reliably opened. Further, there is no need to use a tear tape, and the manufacturing process is simplified.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state before contents are inserted in a packaging bag according to an embodiment of the present invention.
FIG. 2 is a partially enlarged cross-sectional view showing a back sticking seal portion of the embodiment of the present invention.
FIG. 3 is a perspective view showing opening of a packaging bag for housing packaging according to an embodiment of the present invention.
FIG. 4 is a perspective view showing a state in which a conventional packaging bag for casing packaging contains a casing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Back sticking seal part 2a Knob part 4, 4 'Side part 5 Back part 6 Front part 10 Header part 14 Foot part 15a Rough surface processing part 20a Bend base

Claims (1)

By bending one laminated sheet made of a laminated film, a front part and a back part and a pair of side parts for connecting these are formed, and the upper part of the front part and the back part are welded and a header part is formed. The front end and the lower end of the back are welded to form a foot, and a back sticker extending from the header to the foot is formed on the back, and the back sticker is formed. In a packaging bag that formed a pair of notches in the opening when opening,
A packaging bag, characterized in that a roughened portion is formed at least in the film around the bent base portion of the back-sticking seal portion on the side opposite to the opening direction in the knob portion.

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