JPH11124148A - Bag-shaped package and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength of a packaging bag by bonding and cutting edges of sides of an opening portion or edges of side marginal portions by a method of sealing and cutting to remove lug edges and bonding widely a portion at a position which is apart at a suitable interval from the sealed- and-cut portion by a method of thermal welding or ultrasonic bonding. SOLUTION: In this packaging bag made of a plastic formed into a cylindrical shape, edges of both side marginal portions superimposed by heat seal or ultrasonic welding are bonded to each other to form a sealed part 5 of a gusset portion, and a sealed part 6 of an opening portion is formed at superimposed edges of a bottom. The sealed part 5 of the gusset portion and the sealed part 6 of the opening portion are composed of a sealed fuse-cutting portion formed by sealing and cutting the edges of sides forming the opening portion or the side marginal portion and an adhesive-sealed portion having a fixed width and formed by thermal welding or ultrasonic bonding performed in substantially parallel with the edges at a position which is apart at a suitable interval from the edges. By this method, a product contained in the bag is retained, so that it can be prevented from coming out of the bag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-like package for packaging a plurality of recording media having a relatively rectangular shape such as a VHS video cassette and having a relatively large weight.

[0002]

2. Description of the Related Art Japanese Patent Application No. 9-228937 (TDK)
As shown in (1), the overlapping portion of the side edge portion and the overlapping portion of the opening portion of the bag-like package (a double-sided edge portion formed on the side edge portion or the bottom portion in a state where a product such as a cassette tape is stored). As a sealing method, a method using thermal bonding is conceivable. More specifically, 1) a portion at an appropriate distance from an end of an opening or a side edge is bonded. Alternatively, after bonding, an arbitrary position up to the opening or the end of the side edge is cut with a cutter or the like to remove the ear end. 2) A method has been adopted in which a portion at an appropriate distance from the end of the opening or the side edge portion is thermally melted and the ear end is removed when the portion is bonded and sealed. The method 2) is the most commonly used method for bonding the side edges of the bag. FIG. 1 exemplifies a sealing portion at an opening of a conventional plastic packaging bag. As shown in FIG. 1 (a), a side edge portion of two overlapping bags of a bag 1 is cut off to form a thin welded portion at the side edge portion. Forming and (b)
Similarly, the fuse is also blown into the opening at the bottom to form an almost linear thin welded portion.

[0003]

Even in the case of the conventional method, there is not much problem when the product is lightweight, but when the product becomes heavy, it is necessary to increase the thickness of the bag, especially the gusset. In the case of a type bag, the thickness of the thick gusset part (the part where the opposite side of the bag with a rectangular cross section is folded into a valley shape) and the thickness of the center part sandwiched between the gusset parts come out and adhered If the product is easily peeled off and the bottom of the bag is peeled off, the product may come out of the bag, and if the end is cut with a cutter or the like,
The end of the ear fluttered and looked bad.

[0004]

SUMMARY OF THE INVENTION According to the present invention, an opening end or a side edge is cut and cut by heat fusing to remove an ear end. By wide bonding by ultrasonic bonding, the strength can be improved as a double bonded part of the wide bonded part and the end bonded part by thermal fusing. That is, in the present invention, in a bag-like package formed of a plastic film accommodating a plurality of windings of a substantially rectangular parallelepiped recording medium, an edge of a side forming an opening or a side edge is formed as a sealing fusing portion by thermal fusing, and furthermore, Provided is a bag-like package characterized in that a predetermined width is provided by heat bonding or ultrasonic bonding at a position which is appropriately spaced from the heat fusing portion and which is provided with an adhesive sealing portion by thermal bonding or ultrasonic bonding. . The present invention also provides a method for manufacturing a bag-like package, comprising a step of sealing an opening or a side edge of the bag-like package made of a plastic film for accommodating a plurality of windings of a substantially rectangular parallelepiped recording medium. Alternatively, the end of the side forming the side edge portion is sealed and blown off by heat fusing, and simultaneously or thereafter, at a position appropriately spaced from the end by heat bonding or ultrasonic bonding substantially parallel to the end. Provided is a method for manufacturing a bag-like package, characterized in that the bag-shaped package has a fixed width and is bonded and sealed.

[0005]

According to the present invention, there is a possibility that any one of the openings is peeled off because an external force acts on the sealing portion of the opening from the outside and the inside, but according to the present invention, the heat bonding portion (or the ultrasonic bonding portion).
The presence of both the fusing portion and the fusing portion makes it difficult for any of them to be peeled off, and even if one of them is peeled off, the other is adhered, so that the product inside is suppressed there and does not go out of the bag. Further, since the ends are adhered at the time of fusing, they do not flicker and do not impair the appearance.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before explaining the main parts of the present invention, the structure of the gusset packaging bag of the present invention and the outline of the method for manufacturing the same will be described. Referring to FIG. 5, a bag-like package of the present invention is provided in a packaging bag 1 of a type called a gusset bag.
A video cassette 3 such as a wound VHS video tape is stored. The packaging bag 1 is formed of a single piece of plastic in a tubular shape, and the edges of the overlapped side edges are bonded by heat sealing and ultrasonic welding to form a gusset sealing portion 5, and the bottom portion is overlapped. An opening sealing portion 6 is formed at the edge. The gusset seal 5 and the opening seal 6, according to the invention,
A sealing fusing portion formed by thermally fusing the end of the side forming the opening or the side edge, and heat bonding or ultrasonic wave substantially parallel to the end at a position appropriately spaced from the end And an adhesive sealing portion having a certain width by adhesion. The details will be described later.

The respective portions of the left and right side plates 7, 7 extending above the video cassette 3 are folded in a valley fold, and the portions of the front plate 9 and the rear plate 11, which extend above the video cassette 3, are provided. Are folded in each other to form a flat upper surface. On the inner surface of the portion connected to the upper edge portion of the upper surface portion, facing sealing adhesive bands 13 are formed, respectively, and are bonded and sealed with heat welding, an adhesive or an adhesive. On the upper part of the sealing adhesive bands 13, 13, grips 17 having aligned handle holes 15, 15 are provided in alignment. Further, the handle 17 may be provided with a reinforcing plate.

Next, a method for manufacturing a bag-like package of the present invention will be described with reference to FIG. First, as shown in (1), a film raw material wound into a roll (for example, PP having a heat bonding layer on the inner surface, etc.).
Other plastic base films such as T, PVC, PE, etc. can also be used. (If a thermal adhesive layer is also formed on the outer surface, the folded portion can also be bonded.) While unwinding the film 19, the film 19 is formed into a cylindrical shape as shown in (2), and the overlapping portion of the side edge portion is thermally blown and cut. The gusset sealing portion 5 is formed by bonding. Further, as shown in (3), the tubular body is folded into a square shape, and the side plates 7 are folded back in a valley fold. This valley folded part 8
This is called a gusset part. As shown in (4), the adhesive band 13 described with reference to FIG.
A handle portion 17 having a handle 13 is formed, and a handle hole 15 is punched out as shown in (5) to complete the handle portion 17.
It cuts at a predetermined position so as to form the bottom opening 21 as shown in (6). A plurality of products are inserted from this side, and the bottom is folded down to be flattened. Finally, thermal cutting is performed to form the opening sealing portion 6. The part into which the product is inserted is called an opening.

Next, the structure of the sealing portion of the present invention will be described in detail with reference to FIGS. FIG. 2A shows the structure of the gusset sealing portion 5 formed on the side of the bag, and FIG. 2B shows the structure of the opening sealing portion 6. The gusset sealing portion 5 includes a fusing seal 23 and a wide seal 25. Opening sealing part 6
Consists of a fusing seal 27 and a wide seal 29. Both fusing seals are thin, linear adhesives formed at the edges and are very commonly used in this type of plastic bag. Each of the wide seals is formed by heat fusion or ultrasonic bonding, and forms a fusion portion with a wide width of about 1.5 to 5 mm. The distance between the fusing seal and the wide seal is 1-5m
The distance should be about m. FIGS. 3A and 3B are diagrams showing modified examples in which a wide seal is formed by alternately arranging a fusion portion and a non-fusion portion, and FIG. 3A shows a large number of rectangular fusion portions. Are linearly arranged at regular intervals, and (b) is a small square fused portion arranged at regular intervals in a zigzag manner, and other effective patterns can be designed.

[0010]

[Example] Two opposite sides of a plastic film (hereinafter, referred to as a film) made of a polypropylene base material are bonded and sealed (wire bonding) by thermal fusing (conventional product), and then bonded and sealed by thermal fusing, followed by thermal fusing. Near the part (1.5mm
(Separation) was bonded and sealed (wide bonding) at a width of 2 mm by thermal bonding (product of the present invention). The cylindrical film was cut at a predetermined length, and two opposing surfaces of the cylindrical film were valley-folded to fold the film to form a gusset portion. One side opening side of the cylindrical film was thermally bonded to the entire surface with a width of 5 cm from the end of the opening to form a handle portion, and a bag-like package having a hole for finger hanging was prepared. VH from the other opening side
After inserting 10 S-video cassettes, a gusset portion having no cassette was folded inward to produce a product in which the opening was bonded and sealed according to the following contents. After bonding only the central portion of the bag-like package with a width of 2 mm without bonding the gusset portion, the ear end was removed with a cutter at a position of 10 mm from the bonded portion toward the end (only wide-width bonding). This is due to the conventional method. After bonding only the central portion of the bag-shaped package with a width of 2 mm without bonding the gusset portion, the entire width of the bag is cut off by hot fusing at a position of 10 mm from the bonded portion toward the end, and the ear end is removed. (Broad bonding + wire bonding by thermal fusing). This is the product of the present invention. As shown in FIG. 6, the results of a drop test (height: 60 cm, one corner on the opening side) of the combination of these products (1) and (2) are shown in Table 1. The value is the value of three samples.

[0011]

[Table 1]

[0012]

From the results, it can be seen that a difference appears in the amount of bag breakage when the present method is used as compared with the conventional method. In addition, a remarkable effect was obtained when both the side edge portion was bonded (the gusset portion was sealed) and the bottom edge portion was bonded (the opening was sealed). According to the present invention, the presence of both the thermal bonding portion or the ultrasonic bonding portion and the fusing portion makes it difficult for any of them to be peeled off. Is restrained there and never goes out of the bag. Further, since the end portions are adhered at the time of fusing, they do not flicker and do not impair the appearance.

[Brief description of the drawings]

1A and 1B show a sealing portion of a conventional bag-shaped package, wherein FIG. 1A shows a gusset sealing portion at a side edge portion, and FIG. 1B shows an opening sealing portion at a bottom portion.

FIG. 2 shows a sealed portion of the bag-shaped package according to the embodiment of the present invention,
(A) shows the gusset sealing portion at the side edge, and (b) shows the opening sealing portion at the bottom.

FIG. 3 shows a sealed portion of a bag-shaped package according to another embodiment of the present invention, and (a) and (b) are different embodiments.

FIG. 4 is an explanatory diagram showing a flow of manufacturing a bag-like package of the present invention.

FIG. 5 is a perspective view of a bag-like package of the present invention.

FIG. 6 is a perspective view showing a drop test.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 packaging bag 3 video cassette 5 gusset sealing portion 6 opening sealing portion 7 left and right side plate 8 gusset portion 9 front plate 11 back plate 13 sealing adhesive band 15 handle hole 17 handle portion 19 film 23, 27 fusing seal 25, 29, 31, 33 Wide seal

Claims (2)

[Claims] 1. A bag-like package made of a plastic film for accommodating a plurality of substantially rectangular parallelepiped recording media, wherein an end of a side forming an opening or a side edge is formed as a sealing fusing part by thermal fusing and said end. A bag-like package body provided with a sealing portion having a fixed width formed by thermal bonding or ultrasonic bonding substantially parallel to the end portion at a position spaced from the portion by an appropriate distance. 2. A method for manufacturing a bag-like package, comprising a step of sealing an opening or a side edge of a bag-like package made of a plastic film accommodating a plurality of substantially rectangular parallelepiped recording media. Alternatively, the end of the side forming the side edge portion is sealed and blown off by heat fusing, and at a position spaced from the end by a suitable width substantially parallel to the end by thermal bonding or ultrasonic bonding. And a method for producing a bag-shaped package, wherein the package is sealed.