JP2984412B2 - Easy-open heat-shrinkable package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0101]

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.

[0092]

2. Description of the Related Art As a conventional technique for facilitating opening of a heat-shrinkable package made of a heat-shrinkable film, a perforation for opening is provided at an appropriate position of a film, and a bag is opened from the perforated portion. A method of providing a printing portion made of an ink which is not heat-sealed on the joint surface when packing an object to be packaged by a gasket seal made of a plate and opening the printed portion (Japanese Patent Publication No. 57-5160), or When forming a body, a method is used in which a label is inserted between overlaps of an envelope-attached shape and the label is pulled (Japanese Patent Laid-Open No. 61-1
1329, JP-A-61-81932) and the like. Also, a method of electrostatically sealing the envelope-attached overlapping portion and subjecting the overlapping portion to perforation (Japanese Patent Application Nos. 1-102799 and 1-33).
3680, and Japanese Patent Application No. 2-119319).

[0093]

However, in the method of attaching perforations, the holes of the perforations are enlarged at the time of heat shrinkage, and the air inside the package is discharged at one time, so that the heat shrink wrapping finish is deteriorated. However, when handling the heat-shrinkable package, there was a major drawback in that the package was cut from the perforation hole and the bag was broken. On the other hand, the method employing the joint seal method has a problem that the heat seal method causes the joint to be deformed by heat shrinkage, or the joint to protrude to the outside of the package, resulting in poor appearance. there were. Also, when stacking the heat-shrinkable packages, there is a drawback such that the protruding joint seal portion hinders the operation and becomes unstable.
Also, regarding the method of inserting the label into the envelope pasting part,
Even if the label is pulled at the time of opening, there is a defect that the film cannot be easily opened because the film has no break. Furthermore,
With respect to a method of electrostatically sealing an overlapped portion of envelopes and performing perforation on the overlapped portion, packaging could not be performed at a place where the electrostatic sealing device was not owned.

[0093]

According to the present invention, the following measures are taken to provide a heat-shrinkable package which can be easily opened by removing these drawbacks and has a beautiful appearance. Was. That is, the object to be packaged is housed in a tubular body in which a pair of edges of a heat-shrinkable film are overlapped with each other in an envelope-attached shape, and further, both ends of the tubular body are fused and sealed. A heat-shrinkable package obtained by heat-shrinking the body in a heat-shrinking tunnel and blocking the envelope-attached overlapped portion, wherein the outer laminated film of the overlapped portion of the pair of film edges is provided. The first from the edge to the perforation on the inlaid film
The blocking strength of the superimposed zone is weaker than the blocking strength of the second superimposed zone from the perforated portion applied to the inlaid film portion to the edge of the inlaid film.

Further, in order to cause a difference in the blocking strength so as to satisfy the above conditions in such an envelope-attached overlapping portion, a method of applying a blocking inhibitor to the first overlapping zone (claim 2) Alternatively, a method of applying a blocking accelerator to the second overlapping zone (Claim 3), or a method of applying a blocking inhibitor to the first overlapping zone and applying a blocking accelerator to the second overlapping zone. (Claim 4). Furthermore, a method in which a blocking accelerator is partially applied to the first overlapping zone, and a blocking accelerator is applied to a portion more than the first overlapping zone in the second overlapping zone (claim 5).
There is.

Hereinafter, the present invention will be described with reference to the drawings. First, FIG. 1 is a perspective view showing an embodiment of the easily-openable heat-shrinkable package of the present invention. A perforation (2) is provided on the film that is overlapped inside the heat-shrinkable film (1) inside the envelope-sticking overlap portion (4), and the envelope-sticking overlap portion (4) passes through the heat shrink tunnel. When you are blocking. In addition, the front and rear ends of the package are sealed by fusing (5).

FIG. 2 is a partial cross-sectional view of the heat-shrinkable film of the overlapped portion of the envelope in FIG. 1 taken along the line aa ′. FIG. This shows a portion where the blocking strength is high and a portion where the blocking strength is low after passing through the shrink tunnel. That is, of the pair of the film edges (A) and (B), the perforation is applied to the film portion superposed from the outer film edge portion (A) to the inner film portion in the envelope-attached overlapping portion (4). The blocking strength of the first overlapping zone (4a) up to the portion (2) is weak, and the second from the perforation (2) portion applied to the inlaid film portion to the inboard film edge (B) is applied. The blocking strength of the overlapping band (4b) is high.

As a method of weakening the blocking strength of the first overlapping zone (4a), there is a method of applying a blocking inhibitor to the zone. Second overlapping band (4
As a method of increasing the blocking strength of b), there is a method of applying a blocking accelerator to the band. As a method for making the blocking strength of the first overlapping zone (4a) weaker than the strength of the second overlapping zone (4b), a blocking accelerator is partially applied to the first overlapping zone (4a). In the second overlapping zone (4b), there is a method in which a blocking accelerator is applied to a larger portion than the first overlapping zone (4a).

For example, in the case of using a multilayer heat-shrinkable film or the like in which both outer layers are made of polyethylene resin and the core layer is made of polypropylene-based resin, which easily causes blocking in the heat shrink tunnel, as shown in FIG. The zone (4a) is coated with a blocking inhibitor (Claim 2). When using a polypropylene-based single-layer heat-shrinkable film or the like which does not easily cause blocking in the heat-shrink tunnel, as shown in FIG.
A blocking accelerator is applied to the second overlapping zone (4b) (claim 3). If the blocking strength generated in the heat shrink tunnel is too strong for the first overlapping zone (4a) and insufficient for the second overlapping zone (4b), or In the case of one example, when the opening property is further improved, as shown in FIG.
A blocking inhibitor is applied to the overlapping zone (4a), and a blocking accelerator is applied to the second overlapping zone (4b). Furthermore, when using a film that is unlikely to cause blocking in the heat shrink tunnel, as a method other than the above, as shown in FIG. The first overlapping band (4) is added to the overlapping band (4b).
A blocking accelerator is applied to more parts than a) (claim 5).

It is preferable that some blocking occurs in the first overlapping zone (4a) for weakening the blocking strength after passing through the heat shrink tunnel. That is, after heat shrinkage, it is unsightly if the edge of the film overlapped is flickering, and the portion is caught at the time of handling, resulting in bag breakage.

The blocking inhibitor is not particularly limited, but those used in conventional general synthetic resin films can be used. For example, there is a silica-based anti-blocking agent. Preferably, the antiblocking agent is dispersed uniformly and stably in a solution such as water. Further, a resin composition such as a silicone resin, an acrylic resin used as a medium for ink, and the like are preferably used.

The blocking accelerator is not particularly limited, but a part-coating agent which is conventionally generally used for imparting heat sealability can be used. For example, when used for a polypropylene heat-shrinkable film, a heat seal varnish, chlorinated polypropylene, or the like is preferably used.

The method of applying the blocking inhibitor or the blocking accelerator is not particularly limited, but
The method generally used conventionally is used. For example,
It can be performed by a method such as an extrusion coating method, a roll method or a spray method. The locations where these coating portions are provided may be such that the above conditions are satisfied when they are superposed in an envelope-attached shape. That is, the film edge on the side where perforation is formed, the opposite film edge, or both film edges may be used. Further, the application area may be determined from the degree of the effect of the blocking inhibitor or the blocking accelerator. That is, when these effects are great, the width of the application portion can be reduced, provided in an intermittent manner, or formed into several lines at intervals.

There is no particular limitation on the perforation processing, and a method and a shape generally performed conventionally can be used as they are. Further, the position of the perforation is processed along one length of one edge of the heat-shrinkable film. However, the edge of the perforated film is made to be an inner edge when the edges of the film are overlapped in an enveloped shape. In the case where the perforated film edges become outer overlapping edges when they are overlapped in an envelope-attached shape, when the packages rub against each other, a bag breaks from the perforation holes. Further, if the perforated portion does not come to the overlapped portion of the envelope, not only the bag is easily broken at the time of handling the package, but also the air in the bag is discharged at a time during the heat shrink wrapping, resulting in good heat shrinkage. The packaging finish cannot be obtained.

The easily-openable heat-shrinkable package of the present invention is obtained by the following steps. First, one edge portion of the heat-shrinkable film is subjected to perforation along the length direction, and furthermore, a blocking inhibitor or a blocking accelerator is applied so as to satisfy the conditions of the present invention when overlapped in an envelope-like shape. Apply the agent in place. The heat-shrinkable film obtained in this manner is overlapped on both sides of an envelope by a former, an object to be packaged is accommodated in the cylindrical body, and both ends of the object to be packaged are sealed by fusing and sealing. Get the previous package. The package is placed on a conveyor so that the overlapped portion of the envelope is on the lower side, and is passed through a heat shrink tunnel to obtain an easily openable heat shrinkable package.

[0162]

In the heat-shrinkable package according to the present invention, after passing through the heat-shrinkable tunnel, the first overlapping zone (4a) has weak blocking in the envelope-attached overlapping portion, and the second overlapping zone (4a). 4b) has strong blocking. Therefore, when the envelope-attached overlapping portion of the heat-shrinkable package is pulled to both sides at the time of opening, the blocking of the second overlapping band (4b) is not removed, but the blocking of the first overlapping band (4a) is easily performed. Peeling occurs. As a result, it can be torn from the perforation portion and can be easily opened.
In addition, during general handling, the perforated portion provided on one film edge is covered by the other film edge, so that it is difficult to easily break the bag during general handling. Further, since the perforation hole is covered and sealed by the other film edge, the air inside the package is not discharged at one time during heat shrinkage, so that the heat shrink wrapping finish is improved.

Hereinafter, the present invention will be described in more detail with reference to Examples of the present invention, but the present invention is not limited thereto.

Example 1 Both outer layers were linear very low density polyethylene,
Perforation processing of cuts of 3 mm in length and 1.5 mm intervals is performed at a position 10 mm from one edge of the multilayer heat-shrinkable film whose core layer is made of an ethylene-butene-propylene terpolymer. Then, a solution in which a silica-based anti-blocking agent is uniformly dispersed as a blocking inhibitor immediately inside thereof has a width of 30 by a roll method.
mm. Edges of both sides should be 3 so that the coating portion of the film with the blocking inhibitor is between the overlaps of the envelopes.
They were overlapped with a width of 0 mm to form a cylindrical body. After accommodating three notebooks in the cylindrical body and fusing and sealing the front and rear ends, the notebook is placed on a conveyor belt such that the overlapped portion of the envelope is on the lower side and passed through the heat shrink tunnel,
A heat-shrinkable package was obtained. The obtained heat-shrinkable package had a good heat-shrinkable finish, and did not break during general handling. In addition, when the notebook was pulled out and the envelope-attached overlapped portion was pulled to both sides, tearing occurred from the perforated portion, and the notebook could be easily opened.

[0182]

Example 2 A single-layer heat-shrinkable film of an ethylene-propylene copolymer was subjected to perforation in the same manner as in Example 1, and immediately outside the heat-sealing varnish for polypropylene film (Toyo Ink Co., Ltd.) as a blocking accelerator. 7) PPHG seal) was applied in a width of 7 mm by a roll method. The notebook was subjected to heat shrink wrapping in the same manner as in Example 1 except that the both edges were overlapped with a width of 20 mm so that the application part of the blocking accelerator of the film was located between the overlaps in the envelope-pasted state. . As in Example 1, the obtained heat-shrinkable package was easy to open and the heat-shrinkable package finish was good. Furthermore, there was no occurrence of bag breakage during general handling.

[0119]

As described above, since the heat-shrinkable package of the present invention is packaged by blocking the overlapped portion of the envelope in the heat-shrinkable tunnel, an electrostatic seal device or the like is unnecessary. Further, the heat-shrinkable package of the present invention hardly causes bag breakage, so that it is not necessary to pay much attention to handling. Moreover, a good heat-shrinkable packaging finish can be obtained, so that commercial value can be enhanced. Furthermore, the greatest effect when using the heat-shrinkable package of the present invention is that the package can be easily opened.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an easily-openable heat-shrinkable package of the present invention.

FIG. 2 is a partial cross-sectional view of the heat-shrinkable film in the envelope-attached overlapping portion in FIG. 1 taken along the line aa ′.

FIG. 3 is a partial cross-sectional view of the heat-shrinkable film of the envelope-attached overlapping portion in FIG. 1 taken along the line aa ′, and shows a first overlapping zone (4) of the envelope-attached overlapping portion;
a) shows the case where a blocking inhibitor was applied.

FIG. 4 is a partial cross-sectional view of the heat-shrinkable film of the envelope-attached overlapping portion in FIG. 1 taken along the line aa ′, and shows a second overlapping zone (4) of the envelope-attached overlapping portion;
The case where the blocking accelerator was applied is shown in b).

FIG. 5 is a partial cross-sectional view of the heat-shrinkable film of the envelope-attached overlapping portion in FIG. 1 taken along the line aa ′, and shows a first overlapping zone (4) of the envelope-attached overlapping portion;
The case where the blocking inhibitor was applied to a) and the blocking accelerator was applied to the second overlapping zone (4b) is shown.

FIG. 6 is a partial cross-sectional view of the heat-shrinkable film of the envelope-attached overlapping portion in FIG. 1 taken along the line aa ′, and shows a first overlapping zone (4) of the envelope-attached overlapping portion;
a) is partially coated with a blocking accelerator, and the second overlap zone (4b) is coated with the first overlap zone (4).
The case where a blocking accelerator is applied to more parts than in a) is shown.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 heat-shrinkable film 2 perforation 3 packaged object 4 envelope-attached overlapping portion 4a first overlapping zone 4b from outer edge of film overlapped to inner portion of perforated film attached to film portion 4b Superposition zone from the perforated portion attached to the film portion to the edge of the film superimposed on the film portion 5 Fusing seal portion 6 Blocking inhibitor 7 Blocking accelerator A Outer layered film edge B Inner layered film Rim

Claims (5)

(57) [Claims] An object to be packaged is housed in a cylindrical body formed by laminating a pair of edges (A) and (B) of a heat-shrinkable film (1) in an envelope-attached shape. A package obtained by fusing and sealing both ends of the tubular body (5), and then thermally shrinking the tubular body in a heat shrink tunnel and blocking an envelope-attached overlapping portion (4),
Of the pair of film edges (A) and (B), the perforation (2) applied to the film portion superposed from the outer film edge (A) to the inner film portion, out of the overlapped portion (4) of the envelopes. (1) First overlapping band up to section (4a)
Is weaker than the blocking strength of the second superimposed zone (4b) from the perforation (2) applied to the inlaid film portion to the inlaid film edge (B). Easy-opening heat-shrinkable packaging 2. A blocking inhibitor (6) is applied to a first superposition zone (4a) from the outer superposed film edge (A) to the perforation (2) applied to the inner superposed film portion. The easy-opening heat-shrinkable package according to claim 1, wherein the heat-shrinkable package is easily opened. 3. A blocking accelerator (7) is applied to a second overlapping zone (4b) from the perforation (2) applied to the inlaid film portion to the inlaid film edge (B). The easy-opening heat-shrinkable package according to claim 1, wherein the heat-shrinkable package is easily opened. 4. A blocking inhibitor (6) is applied to a first overlapping zone (4a) from an outer laminated film edge (A) to a perforation (2) applied to an inner laminated film portion. And a second overlapping zone (4) from the perforation (2) applied to the inlaid film portion to the inlaid film edge (B).
2. The easy-opening heat-shrinkable package according to claim 1, wherein a blocking accelerator (7) is applied to b). 5. A blocking accelerator (7) is provided in a first superposition zone (4a) from an outer superposed film edge (A) to a perforation (2) portion applied to an inner superposed film portion. The first overlapping zone (4a) is applied to the second overlapping zone (4b) from the perforation (2) applied to the partially applied and internally superposed film portion to the inner superimposed film edge (B). The easy-opening heat-shrinkable package according to claim 1, wherein the blocking accelerator (7) is applied to a larger part of the heat-shrinkable package.