JPH06100021A - Easy-open heat shrinkable package - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a heat-shrinkable package which is easy to open, has a good heat-shrinkable packaging finish, and is less likely to be broken during handling such as transportation. [Structure] A perforation is provided at an end of films laminated in an envelope pasting state, the superposed portion is electrostatically sealed, and a heat seal conforming to the perforation is applied to a predetermined position of the superposed portion. .

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 made of a heat-shrinkable film which can be easily opened.

[0002]

2. Description of the Related Art As a conventional technique for obtaining a package of a heat-shrinkable film, a perforation for opening is attached at an appropriate position of the film for easy opening, or a film edge portion to be sealed. After printing with a non-adhesive ink on the part that becomes the inner surface when superposed with, the film is wrapped with this film by the palm-sealing method and heat-shrinked, so that only the printed part is left untouched. One that is left as it is, and after heat shrinking, this unjoined portion is used as an opening (Japanese Patent Publication No. 47-5160), or a label is attached to the edge of a heat-shrinkable synthetic resin film, and then the film is attached to an envelope. A package obtained by forming a tubular shape by (Japanese Examined Patent Publication No. 3-43133, Japanese Examined Patent Publication No. 3-43134), a package provided with a rupture portion, and a label attached to the ruptured portion (actual opening Sho 59- 86262), and the like.

Furthermore, the electrostatically sealed envelope-attached overlapping portion is subjected to perforation processing (Japanese Patent Publication No. 2-282073), and the film edge portion is subjected to perforation processing to obtain the envelope-attached overlapping portion. A package which is electrostatically sealed by inserting an opening label therebetween (Japanese Patent Laid-Open No. 168872/1987) or a superposed portion of an electrostatically sealed envelope-bonded tubular body is perforated and A package having an antistatic agent or an antiblocking agent interposed between the overlapping layers (Japanese Patent Laid-Open No. 2005-2005).
5) etc.

However, the package obtained by the conventional method of attaching perforations has major drawbacks such as enlargement of perforation holes at the time of heat shrinkage and spontaneous opening due to cutting from the perforation portion at the time of handling. The one adopting the seal-sealing method has a drawback that it is unsightly because the sealing portion protrudes and is unstable when the packages are stacked. Furthermore, the packaging body in which the label-attached film is envelope-attached to the edge of the heat-shrinkable film is difficult to open because the film is not broken even if the label is pulled at the time of opening. Further, in the method in which the label is attached to the rupture portion provided on the film of the package, the device for attaching the label to the position of the rupture portion is complicated.

[0005] A package in which only perforations are provided in the electrostatically sealed envelope-bonded overlapping portions is poor in unsealing property, and thus the electrostatically sealed envelope-bonded overlapping portions are perforated and the overlapping is performed. The openability of the package with the label sandwiched therebetween was still insufficient.
Furthermore, a package body in which an electrostatically sealed envelope-attached overlapping portion is subjected to perforation and an antistatic agent or an antiblocking agent is sandwiched between the overlapping portions is still insufficient in unsealing property. In addition, there are drawbacks such as the method of opening the package is difficult to understand.

[0006]

DISCLOSURE OF THE INVENTION The present invention is intended to provide a heat-shrinkable package which is easy to open and has a good heat-shrinkable packaging finish. Further, the present invention is intended to provide a heat-shrinkable package which is less likely to be broken during handling such as transportation.

[0007]

The present invention has taken the following means in order to solve the above problems. That is, a pair of edge portions of a heat-shrinkable synthetic resin film are overlapped with each other in an envelope-bonding manner, and the packaged body is housed in a tubular body formed by sealing the overlapped section, and the packaged body is further packaged. A heat-shrinkable package obtained by heat-sealing the tubular body after fusing and sealing both front and rear ends thereof, wherein an electrostatic seal and a film edge portion are applied to the entire surface of the superposed portion. Parallel to the heat-sealing, and further along the edge to the film edge located outside the package between the heat-sealing and the film edge located inside the package, and / or Perforations are provided along the edges of the film edge located inside the package between the heat seal and the film edges located outside the package. Further, an antistatic agent or an antiblocking agent is interposed in a part or the whole of the overlap between the envelope-attached sheets. Preferably, in a part between the heat seal between the envelope pasting and the film end located inside the package, and / or between the heat seal and the film end outside the package. An antistatic agent or antiblocking agent intervenes in part,
Make perforations exist only in that place.

In the present invention, the perforation formed at an appropriate position on the film edge portion of the package in the envelope-lapped overlapping portion of the film edge portion is at a stage before the pair of edge portions of the film are laminated. , Is given in advance. As a position for attaching the perforation, the perforation is provided so as to come to the above-mentioned predetermined position when the pair of film edges are overlapped in an envelope pasting state, and further,
The perforations are applied along the edges of the film edge. The length of the perforation may be appropriately determined as needed. The shape of the perforation is not particularly limited, and a shape of one row, a shape of two or more rows, a staggered shape, or the like is used. Further, the size of each hole of the perforation and the distance between the holes can be arbitrarily selected.

The electrostatic seal in the present invention is a type of blocking that is caused by applying static electricity to a portion where film edges are overlapped with each other in an envelope-bonded state by an electrostatic generator to form a wide film over the entire overlapped portion. Is to make them adhere closely. Therefore, the overlapped portion to which the electrostatic seal is applied has a flat, transparent and beautiful appearance without a seal mark on the appearance unlike a hot plate seal.

The heat seal is a hot plate, particularly a blade-shaped hot plate, or a heat seal such as an impulse seal for fusion bonding. It is generally called "dog wire seal" or "lap seal".

As a method for interposing an antistatic agent or an antiblocking agent between the envelop-shaped stacking layers, a step before stacking a pair of film edges may be used.
A general method is to dissolve an antistatic agent or an antiblocking agent in a liquid such as alcohol or water, or to disperse the antistatic agent or the antiblocking agent in a uniform and stable state, and apply the antistatic agent or the antiblocking agent to an appropriate portion of the film by a roll method or the like. It is also possible to add the antistatic agent or the like to the ink for printing during general printing.

The antistatic agent in the present invention is not particularly limited, but it is preferable to use one that does not cause strong adhesion when the coated part is electrostatically sealed. For example, a surface active agent such as a cationic surface active agent or an anionic surface active agent is used. More specifically, an antistatic agent generally used as an auxiliary agent for ink is preferably used. Further, the anti-blocking agent is not particularly limited, but those conventionally used for general synthetic resin films can be used. For example, there are silica antiblocking agents and the like. In order to apply them, it is preferable that the antiblocking agent be uniformly dispersed in a solution such as water in a stable state.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a package according to an embodiment of the present invention. FIG. 2 is a partial sectional view taken along the line aa ′ in FIG.

The heat-shrinkable package shown in FIG. 1 has a perforation (1) on one edge (11) of the heat-shrinkable film (1) along the edge (111) of the film edge (11). 2) is formed and the film edge (11) on which the perforation (2) is formed is located outside the package, and the perforation is located inside the package (12). A pair of edge portions (11) and (12) are overlapped with each other so as to be covered with an envelope, and an electrostatic seal is provided on the entire surface of the overlapped portion (4) and a film positioned outside the packaging body. A heat seal (3) is applied between the end (111) and the perforation (2). Further, the heat-shrinkable package has the front and rear ends of (6) of the packaged object covered with fusing seals (5), and the heat-shrinkable film (1) is heat-shrinked by heating.

The partial cross-sectional view of FIG. 2 shows the state of the envelope-bonded overlapping portion of the heat-shrinkable package shown in FIG. That is, a heat seal (3) is applied between the perforation (2) formed on the outer film edge (11) of the package and the film end (111) located on the outer side of the package. ing.

FIGS. 3a and 3b are partial cross-sectional views showing the positional relationship between perforation and heat sealing at the overlapping portion in a heat shrinkable package other than that shown in FIG. 1 by the same method as in FIG. is there. That is, FIG. 3a shows that the perforation (2 ′) formed on the inner film edge (12) of the package has the outer film edge (1) of the package.
1) is covered by the perforation (2 ') and is located inside the package (1).
21) and heat seal (3) is applied.
3b shows that the perforations (2) formed on the film edge (11) are covered by the film edge (12), and the perforations (2 ′) formed on the film edge (12) are Film edge (11)
Covered by a heat seal (3) between the perforations (2) and the perforations (2 ').
Has been applied.

FIG. 4 shows the relationship between the perforation of a heat-shrinkable package in which an antistatic agent or an antiblocking agent is present in a part between the envelop-like overlappings, and heat sealing and the interposition of the antistatic agent or the antiblocking agent. It is a partial cross-sectional view of an example showing. That is, the antistatic agent or antiblocking agent (7) applied to the film edge (12) inside the package is interposed between the film edge (121) and the heat seal (3), (2) formed on the outer film edge (11) of the
Covers.

In the easily-openable heat-shrinkable package of the present invention, when the envelope-bonded overlapping portion is pulled to both sides, peeling does not occur because the entire overlapping portion is firmly joined by heat sealing. , It is possible to break the perforation and open it. In addition, since both edges are joined together by heat sealing and integrated, stress when pulling both ends of the envelope-bonded overlapped portion is easily applied to perforation, and as a result, breakage easily occurs, so unsealing Will be easier.

When an antistatic agent or an antiblocking agent is interposed in a part or the whole between the envelop-bonded overlapping layers,
It is possible to change the adhesion strength by the electrostatic sticker or the adhesion strength depending on the place. As a result, it is possible to easily break the perforations. For example, in the case of the heat-shrinkable package shown in FIG. 4, the adhesiveness between the heat-sealed portion and the film end portion inside the package is reduced by electrostatic sealing, and the perforation portion is easily broken. .

Further, the perforations are provided only partly along the edges of the film edge, and the perforations are provided between the heat seal portion including the perforations and the edge of the film. When the antistatic agent or the like is interposed only in the portion, the opening can be easily performed in the same manner as in the case where the perforation is provided over the entire overlapping portion. Moreover, the resulting heat-shrinkable package is beautiful and the bag is unlikely to be broken during transportation.

In the heat-shrinkable package of the present invention, the perforation formed on the edge of the film is covered by the other edge of the film and is closely adhered by the electrostatic seal. Sometimes the perforations do not act as deaeration holes, so the packaging finish is good. Further, it is possible to prevent the bag from being broken from the perforation portion which occurs during handling such as transportation.

Further, since the heat-shrinkable package of the present invention uses both electrostatic sealing and heat sealing, it has a strong sealing strength and is unlikely to cause bag breakage. It is a completely hermetically sealed package that also complies with the "prevention" regulations.

[0023]

[Effect] As described above, the heat-shrinkable package of the present invention can be easily opened by anyone, and moreover, the packaging finish is good and, moreover, the bag is not easily broken during transportation. Therefore, this heat-shrinkable package can be preferably used for heat-shrinkable packaging of cassette tapes, floppy disks, books, daily sundries, or boxed foods and medicines.

[Brief description of drawings]

FIG. 1 is a perspective view showing a heat-shrinkable package of one embodiment.

FIG. 2 is a partial cross-sectional view taken along the line aa ′ in FIG.

3a and 3b are partial cross-sectional views of a heat-shrinkable package other than that shown in FIG. 1, which is shown in the same manner as in FIG.

FIG. 4 is a partial cross-sectional view of a heat-shrinkable package in which an antistatic agent or the like is interposed in a part between the envelope-attached laps, which is shown by the same method as in FIG.

[Explanation of symbols]

1 Heat Shrinkable Film 11 Film Edge Located Outside of Package 111 Film Edge of Film Edge Located Outside of Package 12 Film Edge Located Inside of Package 121 Located Inside of Package Film edge of film edge 2, 2'perforation 3 Heat seal 4 Envelope pasting overlapping part 5 Fusing seal 6 Packaged object 7 Antistatic agent or antiblocking agent

Claims (3)

[Claims] 1. A tube obtained by stacking a pair of edge portions (11) and (12) of a heat-shrinkable synthetic resin film (1) on each other in an envelope sticking manner and sealing the overlapping portion (4). A heat-shrinkable package obtained by accommodating an article to be packaged (6) in a tubular body, further fusing and sealing (5) both front and rear ends of the article to be packaged, and thermally shrinking the tubular body. In the superposed portion (4), an electrostatic seal applied over the entire surface and a heat seal (3) parallel to the film edge (111) or (121) of the film edge (11) or (12) are provided. Along the edge (111) of the film edge (11) which is provided on the outside of the package between the heat seal (3) and the film edge (121) located inside the package. With perforations (2) and / or heat seals (3) and packaging Film edge (1
A perforation (2 ′) is provided along the edge (121) on a film edge (12) located inside the package between the heat-shrinkable package and the package (11). body. 2. The easily-openable heat-shrinkable package according to claim 1, wherein an antistatic agent or an antiblocking agent is present in a part or all of the envelope-laminated stacks. 3. A portion between the heat seal (3) and the film edge (121) during the envelop pasting and / or the heat seal (3) and the film edge (111).
2. An easily-openable heat-shrinkable package according to claim 1, wherein an antistatic agent or an antiblocking agent intervenes in a part between and, and perforation exists only in the intervening place of the antistatic agent or the like. .