JPH0487957A - Shrink-packaged body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a shrink wrapper that has excellent storage stability for packaged items, as well as excellent sealing strength and aesthetic appearance.

[Prior Art] Conventionally, an item to be packaged is covered and sealed with a heat-shrinkable film, and then the heat-shrinkable film is heat-shrinked by passing through a heat-shrinking tunnel or blowing hot air.
Shrink wrapping is widely used because it is economical, workable, and fast. However, when such shrink wrapping is used for full-surface packaging, it is necessary to make several small holes in advance on the film surface to allow air to escape from the inside of the film, which is completely covered with heat-shrinkable film. Alternatively, it was necessary to evacuate the air inside the film before shrink-wrapping it.

When microscopic holes are made on the surface of a film and used to package food, air, moisture, bacteria, etc. can enter the film through the microscopic holes, causing the food being packaged to oxidize, discolor, or rot. There was a problem that it could not be stored for a long time because of the Furthermore, since there are many minute holes on the surface of the package, the appearance of the package is not very good, especially when printing is applied to the surface of a heat-shrinkable film. There have been problems in that some parts are missing or the pattern or design on the surface of the packaged object overlaps the printed surface through the holes. Therefore, it has been difficult to apply shrink wrapping to packaging luxury goods, gifts, and the like.

In order to solve this problem, when the ends of the heat-shrinkable film are overlapped and sealed, it is necessary to open a gap and make holes on the surface of the package so that the air inside can be discharged from the sealed part. A packaging method has been proposed that does not require

Although this method is effective in solving the above-mentioned drawbacks, the sealing strength is not sufficient (the seal may come off during shrink wrapping, the package wrapped using this method may be accidentally dropped during transportation, or it may be damaged by rough packaging). There were problems such as the bag breaking if handled improperly.

[Problems to be Solved by the Invention] The purpose of the present invention is to solve these drawbacks and provide a packaging body suitable for packaging luxury goods, gifts, etc., which has excellent sealing performance, aesthetic appearance, and packaging strength. That is.

[Means for Solving the Problems] The present inventors have developed a shrink package in which an object to be packaged 1 is wrapped with a heat-shrinkable film 2, and both ends 3 of the heat-shrinkable film 2 are overlapped and sealed. A continuous seal 4 is formed at the outer end of the both end portions 3, and a discontinuous seal 5 is formed at the inner end of the both end portions 3 with a gap large enough to discharge air inside the package. The inventors have discovered that the above-mentioned problems can be solved by a shrink wrap, which is characterized in that an air vent hole 6 is formed between the continuous seal 4 and the discontinuous seal 5. Furthermore, it has been found that when the entire surface of the heat-shrinkable film 2 is printed, a package with particularly excellent appearance can be obtained. Furthermore, the inventors have discovered that when the heat-shrinkable film 2 has gas barrier properties, the packaged object 1 can be stored for a long period of time, leading to the present invention.

That is, in the present invention, since the internal air is discharged through the gap between the discontinuous seals 5 during shrink packaging, there is no need for minute holes for air discharge on the surface of the package. This allows for superior packaging. Next, the internal air discharged from the gap between the discontinuous seals 5 is discharged from the air vent holes 6 formed between the discontinuous seals 5 and the continuous seals 4. Furthermore, after the air is discharged, the heat shrinkable films between the discontinuous seal 5 and the continuous seal 4 are fused together by blocking due to the heat generated during heat shrink packaging, so that packaging with good sealing performance is possible. Furthermore,
In the present invention, since continuous seals 4 are formed on the outer edges of both ends 3 of the heat-shrinkable film 2, the sealing strength of the entire package can be maintained sufficiently. There is less chance of the bag breaking even when handled.

An embodiment of the present invention will be described below with reference to the drawings. First, the object to be packaged 1 is covered with a heat-shrinkable film 2. Any type of heat-shrinkable film 2 may be used (either a single-layer film or a multi-layer film can be used).

As for the covering method, half-fold packaging, billow packaging, etc. are preferably used. Then, both ends 3 of the heat-shrinkable film 2 are overlapped and sealed, and from the spirit of the present invention, it is preferable that the seal be of the hands-in-clap type. The seal in the present invention forms a discontinuous seal 5 at the inner end of both ends 3 of the heat-shrinkable film 2. Examples of the shape of the discontinuous seal 5 include a chain shape, a staggered shape, etc., but it is desirable that the discontinuous seal portion 5 has a gap large enough to allow internal air to be discharged from the discontinuous seal portion 5 during heat shrink packaging. Further, the sealing strength is sufficient as long as the sealing portion 5 does not come off during heat-shrink packaging, and such sealing is usually achieved by thermocompression sealing, electrostatic sealing, or the like. Similarly, continuous seals 4 are formed at the outer ends of both ends 3 of the heat-shrinkable film 2 .

The continuous seal 4 may be formed by a conventional sealing method such as a thermal melt seal, a thermocompression seal, an electrostatic seal, an ultrasonic seal, etc., as long as it can sufficiently maintain the sealing strength of the package of the present invention. An air vent hole 6 is formed between the discontinuous seal 5 and the continuous seal 4. Then, after sealing the front and back, pass the heat shrinkage) or tunnel.
Alternatively, it can be shrink-wrapped by blowing hot air.

In the packaging body of the present invention, when the packaged object 1 is heat-shrink wrapped, the internal air is discharged through the discontinuous seal portion 5, and the discharged air is further discharged to the outside through the air vent hole 6. This allows for packaging with a good finish.

In addition, since there are no holes on the packaging surface, especially when using a heat-shrinkable film 2 printed on the entire surface, holes will not be missing in the printed pattern of the heat-shrinkable film 2, and the packaging material 1 will not be damaged. The heat-shrinkable film 20 on the surface of the package through which the pattern passes through the hole.
There is no overlap with the design, so it is possible to create beautiful packaging that is not possible with conventional shrink wrapping.

Furthermore, after the air inside the package is exhausted, both ends 3 of the heat-shrinkable film 20 between the discontinuous seal 5 and the continuous seal 4 are blocked and fused, making it possible to package with good sealing performance. When a gas barrier film is used as the heat-shrinkable film 2, it becomes possible to preserve the packaged object 1, such as food, for a long period of time.

Moreover, since the continuous seal 4 provides sufficient sealing strength, accidents such as bag breakage are less likely to occur during packaging and during transportation and handling after packaging.

[Operations and Effects] According to the present invention, it is possible to perform shrink packaging without air vent holes on the surface, which improves the sealing performance and the long-term storage life of the packaged items. Using film allows for more beautiful packaging than before. As a result, shrink wrapping can now be used to package luxury goods, gifts, etc., improving work efficiency and reducing costs.

[Brief explanation of the drawing]

1 and 2 are perspective views showing the shrink wrap of the present invention, and FIGS. 3 and 4 are plan views of the sealing surface thereof. Heat-shrinkable film for packaged items Continuous sealing on both ends of heat-shrinkable film Discontinuous sealing Seals before and after air vent holes

Claims (3)

[Claims] (1) In a shrink package in which the packaged object 1 is wrapped with a heat-shrinkable film 2 and both ends 3 of the heat-shrinkable film 2 are overlapped and sealed, a continuous seal 4 is attached to the outer end of the both ends. A discontinuous seal 5 is formed at the inner end of both ends with a gap large enough to exhaust the air inside the package, and between the continuous seal 4 and the discontinuous seal 5. A shrink wrap characterized by having air vent holes 6 formed therein. (2) The shrink wrapper according to claim 1, wherein the entire surface of the heat-shrinkable film 2 is printed. (3) The shrink wrap according to claim 1 or 2, wherein the heat-shrinkable film 2 has gas barrier properties.