JPH07242266A - Easy-to-open heat-shrinkable packaging tray - Google Patents

Abstract

PURPOSE:To offer an easy-to-open and low-cost packaging tray by providing one or more cuts at the end of a welded sealed part. CONSTITUTION:A heat-shrinkable film 2 is folded to half. After an object 1 is held in the film 2, its edges 3, 3', and 4 are welded and sealed. Then, the film 2 is heat-shrunk to complete a tight packaging. Before heating, the film 2 is provided with one or more cuts 5 at the end to form cutted sealed parts 8. The cuts 5 may be provided during or after holding the object 1, or simultaneously with welding and sealing. Then, the film 2 is heated to package the object 1 tightly. During the heating and shrinking, the cut and sealed parts 8 at the edge are deformed to form projections 6 to be used for opening at the welded and sealed part of the film 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-shrinkable package which can be easily opened.

[0002]

2. Description of the Related Art Conventionally, a packaged object is placed in a heat-shrinkable synthetic resin film formed into a bag shape or a half-folded shape, the edges of the film are fused and sealed, and then the film is heat-shrinked. Heat shrink packaging for tight packaging is commonly used. Such heat-shrinkable packaging is actively used because of its advantages such as showing the product to be packaged, that is, the product clearly and clearly, increasing the product value, and easily packaging even a package having a complicated shape. .

However, this so-called heat shrink packaging has a drawback that it is difficult to open. Various methods have been considered to overcome such drawbacks. Conventional methods devised for facilitating the opening of a package with a heat-shrinkable film include a method of inserting perforations for opening at a predetermined position of the heat-shrinkable film, and a U-shape at a predetermined position of the film. There is a method of forming a seal label for opening by forming a hole in a mold and pasting a paper seal on the hole, or a method of attaching a so-called opening tape.

[0004]

However, in the method of forming perforations, when the heat-shrinkable film is heat-treated, the perforation holes are enlarged, and dust enters through the holes to increase the commercial value of the package. There are drawbacks such as lowering the length and breaking perforations during handling. Further, in the method of forming a seal label for opening by sticking a paper sticker on the U-shaped hole, it is necessary to install a device for opening the U-shaped hole, and a paper sticker is required. Therefore, the cost becomes high. Further, the method of attaching the opening tape has a drawback that the complexity is inevitable. Furthermore, when packaging is performed by an L-type sealer packaging machine that uses a half-fold heat-shrinkable film, it is extremely difficult to apply the conventional opening method as described above.

[0005]

The present inventors have overcome these drawbacks and have retained the advantages of heat-shrinkable packaging, while being inexpensive, easy to open, and even decisive. We have conducted intensive studies to provide an easily-openable heat-shrinkable package that can be applied even when packaging is performed by an L-type sealer packaging machine using a half-fold heat-shrinkable film for which no method has been found. As a result, in the heat-shrinkable packaging step, at least one position of the edge of the heat-shrinkable film is provided with a notch to form a notch seal portion, and then the film is heat-shrinked, whereby the fusion-cut seal portion of the heat-shrinkable film package. The inventors have found that it is possible to extremely easily form the unsealing protruding piece, and have completed the present invention.

That is, one aspect of the present invention is a package obtained by encapsulating an object to be packaged with a heat-shrinkable film, heat-sealing the edges, and then heat-shrinking the film. A package having an unsealing protruding piece formed by forming a notch in the edge of the film to form a notch seal portion, and then performing heat shrinkage of the film at at least one position of the portion. Regarding the body

Another aspect of the present invention is a heat-shrinkable packaging method in which a heat-shrinkable film is wrapped around the object to be packaged, the edges are melt-sealed, and then the film is heat-shrinked. A cut-out seal portion is formed by making a cut in at least one portion of the portion, and then the film is heat-shrinked to form an unsealing projection piece at at least one portion of the fusing-sealing portion of the film. The present invention relates to a heat shrink packaging method for a package.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a state in which an article to be packaged is wrapped with a heat-shrinkable film. In the embodiment shown in FIG. 1, the heat-shrinkable film 2 is folded in half to accommodate the object to be packaged 1 therein, and the edges 3, 3 ′ and 4 of the film are fused and sealed. After that, the heat-shrinkable film is heat-shrinked to complete a tight packaging. Before performing this heat-shrinking step, at least one edge of the film is provided with a notch 5 to form a notch seal portion 8. Form. The notch 5 may be formed either during or after containing the packaged object, or the notch may be formed at the same time as the fusing seal.

As the fusing and sealing method which can be used in the method of the present invention, almost all the fusing and sealing methods such as the heat sealing method and the impulse sealing method which have been conventionally used in heat shrink packaging can be adopted. Here, the heat-sealing method is a method of pressing a heating member, usually in the shape of a frame, to the sealing portion of the heat-shrinkable film to fuse and seal the portion, and also the impulse sealing method. Is to perform fusion sealing / cutting by an electric impulse instead of the heating member.

Further, in the case of forming a notch at the edge of the film, for example, when the heat sealing method is adopted as the fusing sealing method, a heating member for forming the notch sealing portion is attached to a part of the heating member to perform the fusing sealing. At the same time, the notch seal portion can be formed.

Next, the film is heat-shrinked to tightly wrap the object to be packaged. FIG. 2 shows a state in which the heat shrinkage of the film is completed and the article to be packaged is tightly packaged. Also,
FIG. 3 shows a state in which the package of FIG. 2 is viewed from the left lateral direction. At the stage of this heat shrinkage, the protruding seal portion 8 formed at the edge of the film is deformed, so that the protruding piece 6 is formed at the fusing seal portion of the film. The size and shape of the formed protruding piece can be empirically determined by adjusting the shape and length of the notch formed in the edge portion of the film, the width of the notch seal portion, and the like.

The method of heat-shrinking the heat-shrinkable film is to pass the package through a hot air tunnel,
Conventional methods well known in the art can be used.

The package obtained as described above has a beautiful appearance as compared with the conventional package except that the projecting piece 6 for opening is present. When the thus obtained package according to the present invention is opened, the protruding piece 6 is pulled along the direction of the fusing seal portion 4 so that the opening can be performed very easily.

Further, by drawing an unsealing mark line on or around the portion of the unsealing projecting piece formed as described above, the position of the unsealing projecting piece is clearly shown, and the unsealing work is facilitated. be able to.

That is, another embodiment of the present invention is a package obtained by encapsulating an article to be packaged with a heat-shrinkable film, sealing the edges by heat-sealing, and then heat-shrinking the film. At least one position of the seal part has a projecting piece for unsealing which is formed by making a notch in the edge part of the film to form a notch sealing part and then performing heat shrinkage of the film. A package characterized in that an opening mark line is drawn on or around one of the pieces; and a package is wrapped with a heat-shrinkable film, and the edges are melt-sealed and then the film is heated. In the heat shrink wrapping method by shrinking, a slit is formed in at least one position of an edge portion of the film to form a notch seal portion, and then the film is heat shrunk to obtain a fill film. A heat-shrink wrapping method for a packaged article, which comprises the step of forming a projecting piece for unsealing at at least one position of the fusing seal part, and drawing an unsealing mark line on or around the slit seal part of the film; .

The opening marking line 7 can be drawn on the notch seal portion of the film by a method easily understood by those skilled in the art. For example, a printing device may be attached to a part of the packaging machine so that an opening mark line 7 can be drawn on the cut seal portion 8 formed at the same time when the cut 5 is formed in the fusing seal portion of the film or around the cut seal portion 8. ,
In addition, before making the notch 5 in the fusing seal portion of the film, the notch seal portion 8 in the film fusing seal portion
It is also possible to draw an unsealing mark line 7 at or around the place where the film is to be formed, or after the notch 5 is formed in the fusing seal part of the film, the unsealing mark part 8 is formed in or around the notch seal part 8. The line 7 can also be drawn (see FIG. 4). In this way, when the film is heat-shrinked after the cut seal portion is provided and the unsealing mark line 7 is drawn, the unsealing mark line 7 is formed around the unsealing protruding piece 6 or around it.
A package having is obtained (see FIGS. 5 and 6). Furthermore, after forming the notch 5 in the fusing and sealing part of the film and heat-shrinking the film to form a package having the unsealing projecting piece 6, the unsealing projecting piece 6 or the unsealing marking line around the unsealing projecting piece 6. You can also draw 7.

As the ink used for drawing the unsealing mark line 7, a known ink in the art can be used, for example, a commercially available quick-drying ink can be used.

When the thus-formed heat-shrinkable package is opened, the opening projection piece 6 whose position is clearly indicated by the opening mark line 7 is pulled along the direction of the mark line. Thus, the opening can be performed very easily.

Although the drawings show only a mode of packaging a box-shaped object to be packaged with a half-folded film, the packaging body and the packaging method according to the present invention are spherical,
It will be apparent to those skilled in the art that the present invention can be applied to an article to be packaged having a cylindrical shape, a prismatic shape, or any other shape. In any aspect, by providing a notch at any one of the edge portions of the heat-shrinkable film to provide a notch seal portion, and then performing a heat-shrinking step, a protruding piece can be formed at that portion. .

[0020]

As described above, the packaging body and the packaging method according to the present invention retain the advantages unique to heat-shrinkable packaging such as hermeticity and aesthetics, and use a special device or a paper label. The present invention provides a heat-shrinkable package with an easy-opening means at a very simple and extremely low cost without using such a further member, and its industrial value is great.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a packaging method according to the present invention.

FIG. 2 is a diagram showing an embodiment of a package according to the present invention.

FIG. 3 is a diagram showing a state in which the packaging body of FIG. 2 is viewed from the left lateral direction.

FIG. 4 is a diagram showing a packaging method according to another aspect of the present invention.

FIG. 5 is a view showing a package according to another aspect of the present invention.

FIG. 6 is a diagram showing a state in which the package of FIG. 5 is viewed from the left lateral direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packaged object 2 Heat-shrinkable film 3, 3 ', 4 Edge of film (fusing seal part) 5 Notch 6 Projecting piece for opening 7 Marking line for opening 8 Notch sealing part

Claims (4)

[Claims] 1. An object to be wrapped is wrapped with a heat-shrinkable film,
In a package obtained by heat-shrinking the film after fusion-sealing the edges, at least one location of the fusion-sealing portion of the film forms a notch at the edge of the film to form a notch-sealing portion, and then the film A package having an opening protrusion piece formed by heat-shrinking. 2. An object to be wrapped is wrapped with a heat-shrinkable film,
In a package obtained by heat-shrinking the film after fusion-sealing the edges, at least one location of the fusion-sealing portion of the film forms a notch at the edge of the film to form a notch-sealing portion, and then the film The packaging body, which has an opening-opening protruding piece formed by heat-shrinking, and in which an opening-opening mark line is drawn on or around the opening-opening protruding piece. 3. An object to be packaged is wrapped with a heat-shrinkable film,
In a heat-shrinkable packaging method by heat-shrinking the film after fusion-sealing the edges, forming a notch seal part by making a notch in at least one position of the edge of the film, and then performing heat-shrinking of the film. ,
A heat-shrinkable packaging method for a packaged article, which comprises forming a projecting piece for unsealing at least at one position of a fusing and sealing part of a film. 4. An object to be wrapped is wrapped with a heat-shrinkable film,
In a heat-shrinkable packaging method by heat-shrinking the film after fusion-sealing the edges, forming a notch seal part by making a notch in at least one position of the edge of the film, and then performing heat-shrinking of the film. ,
A method for heat-shrink packaging of an object to be packaged, comprising a step of forming a projecting piece for opening at at least one location of a fusion-cut seal portion of a film, and drawing an opening mark line at or around the slit seal portion of the film.