JP3398535B2 - Film package with improved openability - Google Patents

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 Conventionally, various unsealing means have been 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 accommodating a magnetic recording medium, an optical recording medium and the like. ing. Conventional typical unsealing means are roughly divided into a case where an unsealing tape is added to the inner surface of the close-packed 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 adhesive band or a non-adhesive band is 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 band is provided in a part of a sealed 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 (a) of FIG. 8, a non-adhesive band 9 is formed on a part of the sealing portion 2 at the overlapping edge of the film 1 that is tightly wrapped, and the non-adhesive band 9 is further oriented in the stripping direction. The cut line 13 (or further cut line 15) is made. At the time of unsealing, the non-adhesive band 9 serving as the unsealing opening is peeled off by a finger, and
Although the tear should propagate in the direction of the cuts 13 and 15 to open the seal, it is often experienced that a small piece 11 is unintentionally peeled off as shown in FIG. 8B. Since most of the film 1 remains in close contact with the product, it becomes difficult to peel it off.

An example in which a non-adhesive band and a weak adhesive band adjacent to the non-adhesive band are provided in a part of the sealing part where both edges of the packaging film are overlapped is described in JP-A-6-336261. Figure 9
As shown in FIG. 3, a weakly adhesive band 17, a non-adhesive band 18, and a notch 19 are provided in a part of the sealing part 2 in which both edges of the packaging film 1 are overlapped. Due to the presence of the notch 19, the non-adhesive band 18 rolls up during heat-shrink wrapping, which allows the film to be peeled off by using it as a clue, but the appearance is bad due to the curl and weak adhesion during handling. The peeling may spread to the band, which may impair the wrapping property and appearance. Further, since the weakly adhesive band 17 is only a part and the remaining part is strongly bonded, it is not easy to unseal.

[0006] According to Japanese Utility Model Publication No. 6-85273,
As shown in (a) of FIG. 10, a non-adhesive band 21 and weak adhesive bands 23 and 25 on both sides of the non-adhesive band 21 are provided at a part along the sealing portion 2 where both edges of the packaging film 1 are overlapped. Adhesive strip 2
Make cuts 27, 29 at the outer ends of 3, 25. In order to peel off the film, the non-adhesive band 21 is raised with the nail, and the weak adhesive bands 23, 25 are peeled with fingers or nails 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,
With this means, it is necessary to peel off the edge of the film up to the cuts 27 and 29 on both sides, so the opening operation is troublesome. Furthermore, since the strongly adhesive sealing portion 2 exists along the non-adhesive band 21 and the weakly adhesive bands 23 and 25, opening is not easy.

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

[0008]

As described above, the edge portion of the conventional packaging film is overlapped to form the sealing portion, and a part of the sealing portion is provided with the non-adhesive band or the weak adhesive band. The provided unsealing means has a drawback that the satisfactory unsealing property and the unsealing property are not sufficiently satisfied. The present invention does not use an opening tape,
Film packaging for rectangular parallelepiped products such as cases for storing magnetic recording media, optical recording media, etc., which have good adhesion and unsealing properties, easy to cause non-adhesive bands, and have an unsealing means with good packaging and appearance. The challenge is to provide the body.

[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). Along the side, in the film package in which the upper and lower side edge portions of the film are overlapped to form a sealing portion, a part of the sealing portion is
A first weak adhesive band, a non-adhesive band, and a second weak adhesive band are formed along the upper edge portion, and in the non-adhesive band or the weak adhesive band, the upper edge is provided with an edge thereof. The above-mentioned problems can be solved by a film package which is characterized by forming cuts that do not reach the target. According to the configuration of the present invention, by the shrink-wrapping using the heat-shrinkable film, the cut which is the opening assisting means formed in the non-adhesive band or in the weak adhesive band in the vicinity of the non-adhesive band has the edge of the film overlapping edge portion. Since it does not extend to the end, even if the film is pulled due to heat shrinkage during packaging, the non-adhesive band does not lift from the surface of the product, so the adhesion and appearance are good, and there is a risk that it will peel off when packing or shipping. Since it is not present, the packaging quality can be maintained. Furthermore, the cut causes an oval-shaped opening due to heat shrinkage during packaging, so that the location can be easily identified, the non-adhesive band can be easily caused by the nail, and the film can be torn easily at the cut point. it can. This position can be more easily discerned by coloring the upper edge and the lower edge of the non-adhesive band or the weak adhesive band having a cut in different colors.

As another aspect of the present invention, 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. In the film package described above, the overlapping portion is added to the arbitrarily selected first surface of the product, and
In a film package in which a portion extending from the surface is formed by folding the first surface and the second surface opposite to the first surface on both side surfaces adjacent to the first surface of the product to form a first folding portion and a second folding portion, respectively. , The sealing part is composed of a weakly adhesive band, a non-adhesive band, and a weakly adhesive band in that order on the first surface, and a weakly adhesive band or a non-adhesive band on the first folding part. The second folding portion is superposed on the first folding portion, and the facing surfaces of the first and second folding portions are strongly bonded at least at the weak adhesive band or the non-adhesive band, and the second folding The part is characterized by forming a cut that does not reach the edge.

In this aspect, the first and second side surfaces are provided.
The folding portion is a triangular or trapezoidal ear, and in the present invention, the overlapping portions of the upper and lower edges of the first folding portion are configured by weakly adhesive bands or non-adhesive bands, and the facing surfaces of the overlapping portions of both folding parts are At least the portion corresponding to the overlapping portion is strongly bonded, and the second folding portion which is located above the second folding portion is close to the edge of the non-bonding band or the weak bonding band of the side portion and is provided as a unsealing assisting means in the second folding part. (2) A cut is provided that does not reach the edge of the folded portion, and especially when a non-adhesive band is provided in the vicinity of the periphery of that portion, the unsealing effect is further enhanced.

According to this aspect, the overlapping portion of the packaging film has a non-adhesive band on a part of the first surface and a weak adhesive band on the other side, and the non-adhesive band and the weak adhesive band on the side surface. Alternatively, since it is composed of both, the entire overlapped portion of the first surface that is sealed can be easily peeled off and opened. That is, first, the non-adhesive band on the first surface is raised with a nail or finger, and if the upper edge side is pulled up as it is, the weak adhesive band on the first surface adjacent to the non-adhesive band is entirely peeled off, and folding on both sides is further performed. Propagate to the department. In this way, it becomes easy to open the whole. Further, since the side portion is provided with an opening assisting means such as a notch with or without a non-adhesive band, the film is broken from that portion and the whole film can be easily peeled off.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a film package according to an embodiment of the present invention, in which a rectangular parallelepiped product 40 such as a case in which a cassette of a magnetic recording medium or an optical recording medium is housed is adhered with a heat-shrinkable packaging film 42. After being wrapped, a sealing portion 44 by heat sealing is formed at the overlapping portion of both edges of the film 42. The overlapping portion of both edges of the film 42 is the 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 FIGS. 1 and 2, a weakly adhesive band 50, a non-adhesive band 54, and a weakly adhesive band 52 are arranged adjacent to the sealing part 44 in the order of a width a which is narrower than the width b of the overlapping part of both edges of the film 42. Are formed. That is, this portion is provided so as to replace the sealing portion 44. As shown in FIG. 2, the weakly adhesive band 52 is provided with a cut 58 at a position relatively close to the non-adhesive band 54 so as not to reach the edge of the upper edge portion. As another form, as shown in FIG. 3, a cut 58 is formed in the non-adhesive band 54 so as not to reach the edge of the upper edge portion.

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 bands 50 and 52 at the same time, the film 42 is made of a heat-adhesive material such as polypropylene, and has a mirror surface corresponding to the strong adhesive sealing part 44. A heater plate having a heat-sealing surface having a circular shape, a heat-sealing surface having a grid pattern or other pattern corresponding to the weakly adhesive bands 50 and 52, and a recess corresponding to the non-adhesive band 54, and heating the heater plate to the upper side of the film. And the overlapping portion of the lower edge portion is pressed against the band having the illustrated width a. 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. In order to form the sealing portion 44, the non-adhesive band 54, and the weak adhesive bands 50 and 52 at the same time, the film 42 is made of a heat-adhesive material such as polypropylene, and the weak adhesive is applied to the weak adhesive bands 50 and 52. The heater plate having a sealing portion 44, a mirror-like heat-sealing surface corresponding to the weakly adhesive bands 50 and 52, and a recess corresponding to the non-adhesive band 54, and heating the heater plate at the upper and lower edges. It is pressed against the band of the width a shown in the overlapping portion. Third
In the formation of the weak adhesive band by the method of (1), non-adhesive ink having high heat resistance is printed in a dot pattern or a grid pattern, and then the whole heater plate having a mirror-like heat-sealing surface is pressed. In this way, the dots printed on the dots or the grid pattern do not adhere. The non-adhesive band 54 corresponds to the entire printing area, and the sealing portion (strong adhesion band) 44 corresponds to the non-printing area.

It is more convenient to provide a mark indicating the opening position and the direction as is known. Further, if the upper edge portion and the lower edge portion of the non-adhesive band 54 or the weak adhesive band 52 having the cut 58 are colored in different colors, the cut 58 expands into an elliptical shape in the heat shrink packaging described later. , That part is easier to see. When the length of the non-adhesive band along the film overlapping edge is relatively long, at least the third weak adhesive band 53 is provided as shown in FIG. 4 in order to prevent peeling and intrusion of dust. It is preferable to provide it adjacent to 54. Further, it is more convenient to provide a mark indicating the unsealing position and direction as is known.

When heat-shrink wrapping is performed using the wrapping film having the above structure, the cut 58 expands into an elliptical shape and stands out, as shown in FIG. 5, which serves as a mark for cutting and raising the non-adhesive band 54. The film can be easily torn from this part by peeling it off with a nail. Further, it is more convenient to change the printing color of the upper and lower edges where the non-adhesive band 54 is overlapped, because the contrast becomes conspicuous. As shown in FIG. 6 (a), since the cut 58 does not reach the edge of the film 1, the overlapping portion is also closely aligned with the product, so that the appearance is good and the cut 58 can be easily handled or handled during transportation. Does not come off.

Next, the operation of opening the film package of the present invention will be described with reference to FIG. First, the non-adhesive band 5 with the nail
4 is lifted, and the slit 62 is released from the break 58.
Is propagated and one side of the cut can be lifted as shown in (b) of the figure, and if the film is peeled off as it is, the weak adhesive band 50 can be easily peeled off, so that the film can be largely peeled off. . Similarly, as shown in (c), the portion on the opposite side of the cut 58 can also be largely peeled off from the weak adhesive band 52.

FIG. 12 is a perspective view of a film package according to another embodiment of the present invention, in which a rectangular parallelepiped product 40 such as a case containing a cassette of a magnetic recording medium or an optical recording medium is heat-shrinkable. It is tightly wrapped with the packaging film 42, and a sealing portion by heat sealing is formed at the interface of the overlapping portions of both edge portions of the film 42 as described below. The overlapping portion of both edges of the film 42 includes a lower edge 49 having an edge 48 and an upper edge 47 having an exposed film edge 46 as shown in FIG. The sealing portion is formed outside the edge 48 (right side in FIG. 13). Referring also to FIGS. 12 to 13, the sealing portion is provided with a width a narrower than the width b of the overlapping portion of both edge portions of the film 42, and in the illustrated example, the surface of the product 40 having the largest area (generally, Any surface is acceptable, including a portion attached to the first surface (hereinafter referred to as the first surface) and a portion formed by folding a film protruding from this surface to both side surfaces into a trapezoidal ear shape. . A weak adhesive band 50, a non-adhesive band 54, and a weak adhesive band 52 are sequentially formed on the overlapping portion on the first surface side. The position of the non-adhesive band 54 may be arbitrary, but if the length is too long, the sealing property will be impaired, and if it is too short, the unsealing property will deteriorate, so it is necessary to set it appropriately such as 5 to 10 mm. However, the sealability can be improved by providing a weak adhesive band between the non-adhesive band 54 and the edge 48. It is important that the weak adhesive bands 50, 52 having the width a extend to both end edges of the first surface.

Next, the structure of the trapezoidal ear portion of the film folded on both side surfaces will be described. 12 and 14
As shown in FIG. 3, the film has ears having overlapping portions at the upper and lower edges of the film and corresponding ears 64, and the interface of the overlapping portions is configured as a weak adhesive band or a non-adhesive band 60. Alternatively, both of them may be mixed. When the non-adhesive band is used, the sealing property is lowered, but it is easy to open. When the adhesive band is weak, the sealing property is good but it is slightly difficult to peel off. The opposite ear 64 is provided with a non-adhesive band 68 on the outer side (right side in FIG. 14) of the edge 46 of the weakly adhesive band or non-adhesive band 60 on the side of the ear 66, and an auxiliary opening means by a cut 70 is provided in that part. Form. The other side surface is similarly configured. Here, the cut 70 does not reach the edge of the ear 64. By doing so, the adhesion at the time of packaging is improved, and the unsealing property at the time of unsealing is improved. At the time of wrapping, after the body is sealed on the first surface side, the ears 66 on the side having the overlapping portion are folded into the side surface of the product 40 as shown in FIG. 14, then the ears 64 on the opposite side are folded onto it, and then non-adhesive. The parts other than the band 68 are strongly bonded.

Next, the state after sealing the side surface is shown in FIG.
2 and the weak adhesive zone 60 (60 'of 60 is hidden between the ears 64 and 66) at the interface of the overlapping portion is
At the edge of the non-adhesive strip 62 formed on the ear 64,
The cut 68 is also displaced from the edge of the non-adhesive band 62. Most of the other parts have strong adhesion,
In particular, the lower ear 64 that overlaps the overlapping portion of the upper and lower edges of the ear 66 side
The portion 71 of is strongly bonded. This can improve the unsealing property of the film, as described below with reference to FIGS.

Using the packaging film having the above structure, sealing and heat-shrink packaging are performed, and the sides are folded and heat-sealed.
The states shown in FIGS. 12 and 15 are obtained. Next, when the non-adhesive band 54 is pulled up by raising the upper edge portion with a nail or a finger, the weakly adhesive bands 50 and 52 easily start peeling and the opening spreads to both sides, and the state shown in FIG. 16 is obtained. Even in that state, the unsealing property is already sufficient.
Since there are 0, 68 and a break 70, the upper edges of the film on both sides are also pulled up. Since the portion 71 in FIG. 15 has strong adhesion, it is pulled up, and as shown in FIG. 17, the ear 64 tears at the break 70 and propagates to the tear 72 and then to 74, so that the film is largely opened.

[0022]

As described above, according to the present invention, the unsealed area and the weakly bonded zones arranged on both sides of the non-bonded zone and the cuts formed in the non-bonded zone or the weakly bonded zone are combined to provide an unsealed area. Can be greatly taken. Furthermore, since the cut is a cut that does not reach the edge of the film, the adhesion and appearance after packaging are good, and there is no risk of this part peeling off easily due to external forces such as transportation,
Further, the position of the cut can be made conspicuous by making the cut oval, and further, the cut can be made more prominent by changing the coloring of the upper and lower edges of the cut, which facilitates the opening. In another aspect, since the non-adhesive band and the weak adhesive bands extending to both ends of the first surface are provided on both sides of the non-adhesive band, the unsealing property is greatly improved. Furthermore, even on the side surface, a non-adhesive band or a weak adhesive band is provided in the overlapping portion, and a cut that does not reach the edge of the ear overlapping with the weak or non-adhesive band is provided in the overlapping ear, so that the film is formed on the side surface. The cleavage is caused and the crack propagates to the whole, and a large opening area can be obtained.

[Brief description of 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 is a perspective view of still another film package according to the embodiment of the present invention.

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

FIG. 14 is a side view showing the structure on the side surface side of the film package of the embodiment of FIG.

FIG. 15 is a perspective view showing how the film package of the embodiment of FIG. 12 is opened.

16 is a perspective view showing a state in which the film package of the embodiment of FIG. 12 is being opened. FIG.

FIG. 17 is a perspective view showing a state in which the film package of the embodiment of FIG. 12 is being opened.

[Explanation of symbols]

40: Box-shaped product 42: Heat shrinkable packaging film 44: Sealing part 46: Exposed film edge 48: Film edge 50: Weak adhesive band 52: Weakly bonded band 54: Non-adhesive band 58: A break that does not reach the edge 60: Weak or non-adhesive band 64, 66: folding part (ear) 68: Non-adhesive band 70: A break that does not reach the edge 71: Strong adhesive band

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65D 65/26 B65D 77/30 B65D 75/62 B65D 71/08

Claims (3)

(57) [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 part of the sealing portion is formed along the upper edge portion in order of a first weakly adhesive band, a non-adhesive band, and a second weakly adhesive band, and in the non-adhesive band or the weakly adhesive band, A film package, wherein a cut line is formed in the upper edge portion so as not to reach the edge. 2. The film package according to claim 1, wherein an upper edge portion and a lower edge portion of the non-adhesive band or the weakly adhesive band having the cut are colored in different colors from each other. 3. A heat-shrinkable plastic film is closely attached to the peripheral surface of a rectangular parallelepiped-shaped product, and an upper edge portion and a lower edge portion of the film are overlapped to form a sealing portion, and the sealing portion. And a portion extending from the product is folded into both side surfaces adjacent to the first surface of the product from the first surface and the second surface facing the first surface, respectively. And a film package having a second folded portion, wherein the sealing portion is composed of a weakly adhesive zone, a non-adhesive zone, and a weakly adhesive zone in that order on the first surface, and in the first folded section, A weakly adhesive band or a non-adhesive band,
The second folding part is overlapped on the folding part and the first
And the opposing surface of the second folding portion is strongly bonded at least at the weakly adhesive zone or the non-adhesive zone, and the second folding portion is formed with a cut that does not reach the edge thereof. Film packaging.