JPH09132268A - Film packaging body of which unsealability and sealability are improved - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide favorable sealability and unsealability without using an unsealing tape by a method wherein for a packaging in such a manner that the upper and lower side edges of a film are superposed and sealed, one part of the sealed part is formed of a non-bonded zone which comes into contact with the edge end of the edge part, and a weakly bonded zone which surrounds parts other than the edge end of the non-bonded zone. SOLUTION: For a film package, a commodity 40 is tightly packaged with a heat- shrinkable packaging film 42, and a sealed part 44 is formed for the superposed part at the edges of the film 42. In this case, the sealed part 44 of which the width (a) is narrower than the width (b) of the superposed part of both edge parts of the film 42, is formed to be adjacent to an edge end 46, and a weakly bonded zone 50 is formed with the same width (a). Then, at an intermediate part, a non-bonded zone 54 of a width (a2) is formed. The weakly bonded zone 50 is formed with a width (a1) on the opposite side of the edge end 46, and at the time of sealing, all the zones other than the sealed part 44 are sealed to prevent moisture, etc., from entering. By this method, by gripping and pulling up the non-bonded zone 54 by finger nails or finger tips at the time of unsealing, the packaging film 42 can be easily peeled extending to the weakly bonded zone 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package having an improved unsealing property, and more particularly, to a package opening means for packaging a rectangular parallelepiped such as a case for accommodating a magnetic recording medium, an optical recording medium or the like with an adhesive packaging film.

[0002]

2. Description of the Related Art Various unsealing means have been conventionally used or proposed in order to improve the unsealing property of a package in which a close-packed packaging film is applied to a rectangular parallelepiped such as a case for housing a magnetic recording medium, an optical recording medium, etc. Has been done. Conventional typical unsealing means are roughly classified into a case where an unsealing tape is provided on the inner surface of the close-packing wrapping film, and a case where the unsealing tape is omitted and a part of the sealing portion is formed by overlapping both edges of the wrapping film. In some cases, a weakly bonded portion or a non-bonded portion may be provided.

An example of a package using an unsealing tape is, as shown in FIG. 7A, closely attached to the peripheral surface of a product 7 (a rectangular parallelepiped such as a magnetic tape cassette, or a rectangular parallelepiped formed by stacking several such tapes). The heat-shrinkable plastic film 1 is brought into close contact with each other, and both edges are overlapped to form the sealing portion 2. At that time, the unsealing tape 3 is put along the inner surface of the film 1, and one end 5 thereof is exposed to the outside. If necessary, the film 1 is cut along both edges of the tear tape 3. When the end portion 5 of the unsealing tape 3 is pinched and pulled at the time of unsealing, the film 1 often comes off only at the portion provided with the unsealing tape as shown in FIG. 7B, and the film portion 1-2 is peeled off. It is easy to remove, but most of the remaining part 1-1 remains in close contact with the product 7, so it is difficult to remove it. Further, this method is problematic in that it is costly.

An example in which a non-adhesive portion is provided in a part of a sealing portion in which both edges of a packaging film are overlapped is disclosed in JP-A-2-10987.
No. 0 and Jitsukaihei 6-78273. As shown in FIG. 8 (a), the non-adhesive portion 9 is formed by dividing the non-adhesive portion 9 into a part of the superposed edge portion 2 of the overlapping edge portion of the film 1 which is tightly wrapped. 9 is provided with a cut 13 (or further cut 15) oriented in the stripping direction.
When the non-adhesive portion 13 serving as the opening is peeled off with a finger at the time of opening, the tear should propagate to the film 1 in the direction of the cuts 13 and 15 and the film should be opened, but contrary to the intention, (b) of FIG. There are many cases in which a small piece 11 is peeled off as described above. Since most of the film 1 remains in close contact with the product, it becomes difficult to peel it off. Further, since the non-adhesive portion divides the sealed portion, the sealing action is not sufficient and the purpose of protecting from moisture, dust, etc. is not fully achieved.

An example in which a non-adhesive portion and a weakly adhering portion adjacent to the non-adhesive portion are provided by dividing the sealing portion in which both edges of the packaging film are overlapped is described in JP-A-6-336261. As shown in FIG. 9, the sealing portion 2 in which both edges of the packaging film 1 are overlapped is divided to provide a weakly adhesive portion 17, a non-adhesive portion 18, and a cut portion 19. Since the non-adhesive part 18 is rolled up during the heat shrink wrapping due to the presence of the cut part 19, the film can be peeled off by using it as a clue, but since the non-adhesive part divides the sealing part. There is a defect that it lacks sealing properties.

[0006] According to Japanese Utility Model Publication No. 6-85273,
As shown in (a) of FIG. 10, a non-adhesive portion 21 and weak adhesive portions 23 and 25 on both sides of the non-adhesive portion 21 are provided in a part along the sealing portion 2 in which both edges of the packaging film 1 are overlapped. Adhesive part 2
Make cuts 27, 29 at the outer ends of 3, 25. In order to peel off the film, the non-adhesive portion 21 is raised by the nail, and the weak adhesive portions 23, 25 are peeled by the finger or the nail in the directions of the arrows A and B, and all the cuts 27 to 19 are caused.
The sealing portion 2 is stripped off at once, as shown in (b). But,
This means that the non-adhesive part 21 cannot be easily triggered by the nail, and even if it is once triggered, the cuts 2 on both sides are
Since the film edge must be peeled up to 7 and 29, the opening operation is troublesome. Furthermore, the strongly adhesive sealing part 2
Exists along the non-adhesive part 21 and the weakly adhered parts 23 and 25, so opening is not easy.

Further, according to Japanese Utility Model Laid-Open No. 7-11564, as shown in FIG. 11, a non-bonded portion 31 and a weakly bonded portion 33 are formed in a part along the sealing portion 2 where both edges of the packaging film 1 are overlapped. And a cut 35 is made in the sealing portion 2 (strong adhesion portion) outside the weak adhesion portion 33. In order to peel off the film, when the non-adhesive part 31 is caused by the nail on the side close to the cut 35, the sealing part adjacent to it is peeled to the cut 35, then the weak adhesion part 33 is peeled off, and along the weak adhesion part 33 Further, the strongly adhered sealing portion 2 is peeled off. However, in this configuration, since the cut 35 is present in the sealing portion, its position is difficult to determine, and it is not easy to lift the non-adhesive portion 31 with the nail. Furthermore, since the sealing portion 2 exists along the non-bonding portion 31 and the weakly bonding portion 33, opening is not easy.

[0008]

As described above, the edge portions of the packaging film are overlapped to form the sealing portion, and a part of the sealing portion is provided with the non-adhesive portion or the weak adhesive portion. The opening method is
There is a drawback that the requirements for good sealability and openability are not satisfied at the same time. The present invention provides a film package for a rectangular parallelepiped product such as a case for accommodating a magnetic recording medium, an optical recording medium, etc., which is provided with an unsealing means having a good sealing property without using an unsealing tape and having a good unsealing property. The challenge is to provide.

[0009]

According to the present invention, a heat-shrinkable plastic film is adhered to the peripheral surface of a rectangular parallelepiped-shaped product (a case such as a magnetic tape cassette, a floppy disk, an optical disk or several cases in which they are superposed). In the film package in which the upper edge portion and the lower edge portion of the film are overlapped with each other to form a sealing portion, a part of the sealing portion is a non-adhesive band in contact with the edge of the upper edge portion. And a weak adhesive band that surrounds a portion other than the edge of the non-adhesive band, and further assists with cuts, notches, perforations, etc. at the upper edge of the non-adhesive band, weak adhesive band, or sealing part There is provided a film package characterized in that an opening means is formed. The auxiliary opening means may be a fold or a bulge formed by shrinkage when heat-shrinkable packaging is performed with cuts, cutouts, perforations and the like.

According to another aspect of the present invention, the heat-shrinkable plastic film is closely attached to the peripheral surface of the rectangular parallelepiped product, and the upper edge and the lower edge of the film are overlapped and sealed. In a film package having a part, a part of the sealing part is a non-adhesive band in contact with the edge of the upper edge part, and a weak adhesive band surrounding a part other than the edge of the non-adhesive band, The film package is characterized in that it is formed at the edge of the upper edge portion with a non-adhesive band that is inclined toward the weakly adhesive band as it goes away from the non-adhesive band.

According to the structure of the present invention, since the unsealing means of the packaging film has the non-adhesive band and the weak adhesive band surrounding the three sides so as to divide the sealing portion (strong adhesive band), Not only does it have a good sealing property, but when opening it, the non-adhesive band is simply pinched by the nail or fingertip and pulled up to easily peel off the packaging film up to the weakly adhesive band part, and further tears with the aid of the auxiliary opening means. The packaging film can be peeled off in a large area by being propagated. Further, when a non-adhesive band whose width increases as it moves away from the non-adhesive band adjacent to the weakly adhesive band is provided along the edge of the film overlapping portion, when the packaging film is torn from the non-adhesive band, Since the weak adhesive band becomes narrower as it goes away from the adhesive band, the tendency that the weak adhesive band becomes harder to peel off on the side farther from the non-adhesive band is eased, and the packaging film is peeled off easily in order toward the outer side, which facilitates opening. .

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings. FIG. 1A is a perspective view of a film package according to an embodiment of the present invention, which is a rectangular parallelepiped product 4 such as a case having a cassette of a magnetic recording medium or an optical recording medium stored therein.
0 is tightly wrapped with a heat-shrinkable packaging film 42,
The sealing portion 4 by heat sealing is provided on the overlapping portion of the edge portion of the film 42.
4 are formed. The overlapping portion of the film 42 consists of a lower edge having an edge 48 and an upper edge having an exposed film edge 46. The sealing portion 44 is formed outside the line 56 that does not reach the edge 48. Referring to (b) showing the AA cross section of FIG. 1, a sealing portion 44 having a width a narrower than the width b of the overlapping portion of both edges of the film 42 is formed adjacent to the edge 46, and A weak adhesive band 50 is formed with the same width a,
The intermediate portion is formed such that the non-adhesive band 54 having the width a2 replaces the weakly adhesive band 50 on the edge 46 side. Weak adhesive band 50
Is formed with a width a1 on the opposite side of the edge 46, and at the time of sealing, all zones other than the sealing portion 44 are also sealed with weak adhesive zones to prevent moisture or dust. After all, the non-adhesive band 54 is surrounded on three sides by the weak adhesive band 50.

2 to 4 are plan views of a main portion having various types of cuts, which are not shown in FIG. 1, and in FIG.
The sealing portion 4 having a width a narrower than the width b of the overlapping portion of the film edge portion
A cut 58 is cut from the edge of the upper edge of No. 4 at a position relatively close to the weak adhesive band 50. As another form, FIG.
As described above, a cut 58 is cut from the edge 46 of the upper edge of the weak adhesive band 50 having the similar structure. As yet another form, as shown in FIG. 4, a cut 58 is cut from the edge of the upper edge portion in the non-adhesive band 54 having a similar structure. FIG. 5 shows that when heat-shrink packaging is performed in the example of FIG. 4, the non-bonded portion is turned over from the cut 58 due to shrinkage.

The weak adhesive zone can be formed by the following three methods.
In the first method, a heater plate having a heat-sealing surface formed by digging grooves in a dot pattern or a grid pattern is pressed against the packaging film so that the film in the contact part is melted and the film in the non-contact part is not melted. To do. In order to form the sealing portion 44, the non-adhesive band 54 and the weak adhesive band 50 at the same time, the film 42 is made of a heat-adhesive material such as polypropylene,
Heating a heater plate having a mirror-like heat-sealing surface corresponding to the sealing portion 44, a heat-sealing surface having a lattice pattern or other pattern corresponding to the weak adhesive band 50, and a recess corresponding to the non-adhesive band 54. Then, it is pressed against the band of the width a shown in the overlapping portion of the upper and lower edges of the film. Ultrasonic energy may be used for heating. In the formation of the weak adhesion band by the second method, an ink having a property of weakly adhering when heat is applied is applied. To form the sealing portion 44, the non-adhesive band 54, and the weak adhesive band 50 at the same time, the film 42 is made of a heat-adhesive material such as polypropylene, and a weak adhesive is applied to the weak adhesive band 50. A mirror-like heat-sealing surface corresponding to the sealing portion 44 and the weakly adhesive band 50 and the non-adhesive band 54.
A heater plate having a mold recess corresponding to the above is heated and pressed against a band having a width a shown in the overlapping portion of the upper and lower edges. In the formation of the weakly adhesive band by the third method, non-adhesive ink having high heat resistance is printed in a dot or grid pattern, and then a heater plate having a mirror-like heat sealing surface is pressed against the ink. In this way, the dots or the portions printed in the grid pattern are not bonded. The non-adhesive belt 54
Indicates the entire printing area, and the sealing portion (strong adhesion portion) 44 corresponds to the non-printing area. In addition, it is more convenient to provide a mark indicating the opening position and the direction as is known.

When heat-shrink wrapping is performed using the wrapping film having the above-mentioned structure, the weakly adhesive band 50 is seamlessly joined together with the strong adhesive part by the sealing part 44 in any of FIGS. However, when the non-adhesive band 54 is pulled up by the claw, peeling is facilitated due to the presence of the weak adhesive band 50. Further, in the case of FIG. 2, the film peels off and tears in a wide area from the cut 58 provided in the vicinity of the weak adhesive band 50 to the weak adhesive band. In the case of FIG. 3, a part of the weak adhesive band 50 near the cut 58 is slightly turned up during the heat shrinkage, so that it becomes a nail hook portion, and peeling can be performed more easily. In the case of FIG. 4, as described in connection with FIG. 5, since the curling at the time of thermal contraction is further increased, the weak adhesive band can be more easily peeled off. The non-adhesive band 54 may be colored so as to be distinguished from other portions, or a known mark for indicating a place and a direction indicating a peeling start position may be provided.

Next, the operation of opening the film package of the present invention will be described with reference to FIG. 6, which is an example of the opening of FIG. First, in (a), if the non-adhesive band 54 is lifted by the nail,
As shown in (b), the tear 62 propagates from the break 58 and the film can be torn, and if the film is peeled off as it is, the weak adhesive band 50 can be easily peeled off. You can As shown in (c), the weak adhesive band 50 is also formed on the opposite side of the cut 58.
It can be peeled off from the place.

12 and 13 are perspective views showing another two kinds of embodiments of the film package of the present invention. In these figures, the configurations of the sealed portion (strongly bonded portion) 44, the weakly bonded band 50, and the non-bonded band 54 are the same as those in the examples up to now, except that the film edge side of the weakly bonded band 50 is The difference is that the non-adhesive portion 64 is replaced. That is, in these drawings, the overlapping portion has a non-adhesive portion 64 on the edge end side of the upper edge portion, which is inclined toward the weakly adhering portion as the distance from the central non-adhesive band 54 increases. In the example of FIG. 12, a break 58
Is placed in the weakly bonded band 50 near the end of the non-bonded portion 64. In the example of FIG. 13, the notch 66 is provided in place of the cut in the sealing portion 44, which is a strong adhesion portion near the end of the non-adhesion portion 64, and the cleavage can be performed from this portion as well.

At the time of opening, in the film package of FIGS. 12 to 13, since the non-adhesive band which is adjacent to the weakly adhesive band and whose width increases as the distance from the non-adhesive band increases, is provided along the edge of the film overlapping portion. When the non-adhesive band 50 is hooked with a nail and the packaging film is torn, the weak adhesive band becomes narrower as it goes away from the non-adhesive band, so that the weak adhesive band is less likely to be peeled away from the non-adhesive body. The film can be peeled off easily to the outside, and finally the film can be torn at the cut 58 or the notch 66 to peel off the film in a large area.

[0019]

As described above, according to the configuration of the present invention,
Since the opening means of the packaging film has the non-adhesive band formed by dividing the sealing part (strong adhesive band) and the weak adhesive band surrounding the three sides, only the sealing property of the package is excellent. Instead, the film can be easily peeled up to the weak adhesive band by simply pulling up the non-adhesive band with the nail or fingertip when opening, and tearing the film with the help of auxiliary opening means such as cuts and notches. , It can be further propagated to peel off the film in a large area. Further, when a non-adhesive band whose width increases as it moves away from the non-adhesive band adjacent to the weakly adhesive band is provided along the edge of the film overlapping portion, when the packaging film is torn from the non-adhesive band, Since the weak adhesive band becomes narrower as it goes away from the adhesive band, the tendency that the weak adhesive band becomes harder to peel off on the side farther from the non-bonded body is alleviated, and the weak adhesive band is easily peeled toward the outer side, which facilitates the opening.

[Brief description of the drawings]

FIG. 1 is a perspective view of a film package according to an embodiment of the present invention.

FIG. 2 is a plan view showing an edge overlapping portion according to an embodiment of the film package of the embodiment of the present invention.

FIG. 3 is a plan view showing an edge overlapping portion according to an embodiment of a film package of another embodiment of the present invention.

FIG. 4 is a plan view showing an edge overlapping portion according to an embodiment of a film package of still another embodiment of the present invention.

5 is a plan view of the actual packaging state of the embodiment shown in FIG.

FIG. 6 is a diagram showing how the film package of the present invention is opened.

FIG. 7 is a perspective view showing a conventional film packaging body using an unsealing tape (a) and an opened state (b).

FIG. 8 is a perspective view showing a conventional film package that does not use an opening tape (a) and an opened state (b).

FIG. 9 is a perspective view of another conventional film package that does not use an opening tape.

FIG. 10 is a perspective view showing still another conventional film packaging body that does not use an opening tape (a) and an opened state (b).

FIG. 11 is a perspective view of still another conventional film package that does not use an opening tape.

FIG. 12 shows a film package according to another embodiment of the present invention.

FIG. 13 shows a film package according to still another embodiment of the present invention.

[Explanation of symbols]

 40: rectangular parallelepiped product 42: heat-shrinkable packaging film 44: sealing part 46: exposed film edge 48: film edge 50: weak adhesive zone 54: non-adhesive zone 58: break

Claims (3)

[Claims] 1. A film package in which a heat-shrinkable plastic film is closely attached to the peripheral surface of a rectangular parallelepiped product and an upper edge portion and a lower edge portion of the film are overlapped to form a sealing portion, A film package, characterized in that a part of the sealing portion is formed by a non-adhesive band that is in contact with an edge of the edge and a weak adhesive band that surrounds a portion other than the edge of the non-adhesive band. body. 2. A film package in which a heat-shrinkable plastic film is closely attached to a peripheral surface of a rectangular parallelepiped product and an upper edge portion and a lower edge portion of the film are overlapped to form a sealing portion, A non-adhesive band that is in contact with an edge of the upper edge part, and a weakly adhesive band that is adjacent to the non-adhesive band on the opposite side of the edge of the upper edge part. A weak adhesive band extending in the longitudinal direction along the sealing portion from both ends of the adhesive band and inclined to the opposite side of the edge of the upper edge portion, and on the edge adjacent to the weak adhesive zone. A film package comprising a second non-adhesive band extending along the film. 3. The film package according to claim 2, wherein a notch is provided in the second non-adhesive band near the boundary between the sealing band and the weakly bonded part.