JPH04112062U - Shrink packaging - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a shrink package with good airtightness. [Configuration] Packaging film 2 that is heat-shrinked around tray 1
It is surrounded by This packaging film is not provided with holes for degassing, and the packaging film 2 used is a film material that has good gas barrier properties and high heat shrinkability. Food and the like are stored in the tray, and the inside of the package 3 is replaced with nitrogen gas or the like. [Effect] Since such a package is a completely sealed bag with no through holes, there is no risk that the filled nitrogen gas or the like will leak out. Moreover, since the packaging film used has good gas barrier properties, there is no leakage to the outside from the film surface unlike in conventional packaging.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a shrink material that is formed by heat-shrinking a packaging film that surrounds an item to be packaged. The invention relates to ink packaging.

0002

[Conventional technology]

Conventionally, to produce shrink packaging, a heat-shrinkable film is placed around the packaged item. An intermediate package is produced by surrounding the package with a rubber band, and the intermediate package is passed through a shrink tunnel. The film is heated by heating to shrink the film and make it adhere tightly to the packaged item. There is. However, the air present inside the intermediate packaging may thermally expand due to the heat generated during heating. The pressure during expansion resists the force of the film to shrink, causing the film to shrink. This will cause the film to bulge and the film cannot be shrunk.

0003 Therefore, we formed invisible microscopic holes in the film at predetermined positions in advance. There is. As a result, when the intermediate packaging is heated, the air inside thermally expands and forms a film. However, the expanded air is released to the outside through the hole. Therefore, the film is smoothly heat-shrinked and can be tightly attached to the packaged item.

0004

[Problem that the idea aims to solve]

As mentioned above, conventional shrink packaging has through holes for air removal (deaeration). It is difficult to close the holes in the final packaging process. There are also through holes in the body, resulting in poor sealing. Therefore, for example encapsulation When the food is a living thing or food, it is necessary to maintain its freshness or prevent the food from discoloring. Gas filled with nitrogen gas, carbon dioxide, etc., along with the packaged object for the purpose of Use of such shrink packaging for packaging manufactured by gas-replacement packaging. I can't. In other words, even if the shrink package is filled with nitrogen gas, etc. However, the nitrogen gas flows out through the holes, reducing the effectiveness of the gas. It's a little long.

[0005] Furthermore, shrinkage of conventionally commonly used polyethylene, polypropylene, etc. The film itself has low gas barrier properties, so it cannot be used with the nitrogen gas filled above. leaks out from the film surface little by little, making the above problem even more noticeable. Ru. This invention was made in view of the above-mentioned background, and its purpose is to: It has good airtightness, so even if it is filled with nitrogen gas, the gas will not leak outside. To provide a shrink package that does not leak.

[0006]

[Means to solve the problem]

In order to achieve the above-mentioned purpose, the shrink packaging body according to the present invention has Formed by heating a packaging film surrounding an object to cause the packaging film to shrink. In shrink packaging, the packaging film has good heat shrinkability and The packaging film is made of a film material with low permeability, and the packaging film is degassed during heating. It is characterized by not having any through holes.

[0007]

[Effect]

The shrink packaging of the present invention has high gas barrier properties of the packaging film itself, and Manufactured without holes for degassing, resulting in highly airtight packaging. . Therefore, in order to maintain the quality of the packaged items, nitrogen gas etc. are used inside the package. Even if the gas is filled with gas, the gas will not leak outside, and the purpose of gas replacement can be achieved. is achieved over a long period of time.

[0008]

【Example】

Below, please refer to the attached drawings for preferred embodiments of the shrink packaging body according to the present invention. This will be explained in detail with reference to the following. FIG. 1 shows a perspective view of this embodiment. Wrap around tray 1 as shown. It is surrounded by a protective film 2. Specifically, it is manufactured in pillow packaging. This is it Ears 4, 4 are formed at both front and rear ends of the package 3, and ears 4, 4 are formed at the center of the lower surface in the longitudinal direction. A center seal portion 5 is formed at the position. Although not shown, the tray Food and other items are stored inside the package 3, and the inside of the package 3 is filled with nitrogen gas. The gas is replaced by gas, etc.

[0009] Here, in the present invention, the packaging film 2 is a gas barrier with low gas permeability. Films with good rear properties and high heat shrinkability, such as BDF-2050 (crystalline (manufactured by Ovac Corporation) is used. Then, a through hole for degassing is opened in the packaging film 2. To manufacture an intermediate package by performing pillow packaging without breaking. By heating the intermediate packaging body formed in this way, the packaging film is heated. A shrink package 3 that is shrunk and tightly adheres to the tray 1 is manufactured. And manufactured Since the packed package 3 is a completely sealed bag with no through holes, the filled nitrogen There is no risk of raw gas etc. leaking outside. Moreover, the packaging film 2 used Good gas barrier properties prevent leakage from the film surface to the outside unlike conventional packaging. It never comes out. Therefore, we take advantage of the characteristics of shrink packaging, such as the ability to firmly fix items. At the same time, nitrogen gas can be sealed inside the package 3, preventing deterioration of the quality of stored items. can.

0010 In addition, since the packaging film 2 has good heat shrinkability (approximately 50 to 60% of its original shrinkage) The ears 4, 4 of the manufactured package 3 are small and wide as shown in the figure. Because it is narrow, the ears 4 do not get in the way during transportation, display, etc., making it easier to work. Improves sex. Furthermore, if the tray 1 that expands at the top as in this example is used, the ear portions 4 does not protrude beyond the edge of tray 1, which improves the display effect in addition to the above-mentioned workability. will also rise. Moreover, the strength of that part also increases.

[0011] Next, a method for manufacturing the package shown in the above example will be explained. pillow packaging machine is used to manufacture the intermediate package, but when sealing the rear end in the direction of travel , push the top surface of the packaging film 2 downward to make it hollow inside, and in that state insert the end sheet. Then, an intermediate package 7 as shown in FIG. 2(A) is manufactured. This allows intermediate The amount of gas present inside the packaging body 7 is reduced, and the packaging film 2 is thermally shrunk. Taking this into consideration, an extra film area is provided. Then, the intermediate package 7 is heated. Then, the packaging film 2 is heat-shrinked. Therefore, as shown in FIG. 2(B), the film located on the top opening side of tray 1 is It will be in a tense state. Also, at the same time, the gas that was present in the intermediate package 7 The film thermally expands, but as the upper surface 2a of the film rises, a newly defined upper space is created. Since the film flows into the tray 8, the film upper surface 2a does not bulge out above the tray 1. stomach. In addition, the reference numeral 9 in the figure indicates a stored article such as food.

0012 Furthermore, in this embodiment, when making a center seal, When using a center seal device with a flat sealing surface, the packaging film used Due to the high heat shrinkability of the foam 2, it will shrink too much and curl up, increasing its thickness. If left as is, end sealing cannot be performed in the subsequent process. Therefore, illustration is omitted. However, the sealing surface of the center sealing device is made uneven and the entire surface of the packaging film 2 is heated. This reduces the amount of heat applied to the packaging film. Specifically, Three grooves are formed on the roll surface. That is, in the center seal portion 5 of the package 3 As shown enlarged in FIGS. 1 and 3, the center seal portion 5 extends in the vertical direction. By forming three seal portions 5a, it is prevented from curling. Note that Figure 3 is for clarity of the shape of the center seal part 5, the seal part pattern, etc. For convenience, the formed center seal portion 5 is shown in an upright state.

[0013] In addition, in the above-mentioned embodiment, the article to be packaged is configured by storing the article in the tray 1. However, the present invention is not limited to this, and there is no tray 1 and the product is directly packaged. In addition, in the above embodiment, the height of the tray 1 is smaller than the height of the items to be stored. Although the height is increased, this relationship may be reversed or arbitrary, and the packaging form may also be changed. Not limited to pillows. In addition, the film material used is not limited to the above examples. Needless to say, the heat shrinkage rate also depends on the dimensions and shape of the article, tray, etc., as well as the intermediate packaging. Depending on the relationship between the amount of space in which the gas exists in the package and the amount of space in the final package, etc. This will be decided as appropriate.

[0014]

[Effect of the idea]

As described above, in the shrink package according to the present invention, the gas barrier of the film material itself is It has high resilience and is manufactured without holes for degassing, so the air in the package is Improves density. Therefore, even if the package is filled with nitrogen gas, etc., the gas will not come out. It is possible to prevent the quality of stored items from deteriorating. As a result, we have achieved the goal of shrink packaging that can securely hold goods and maintain the quality of goods. The benefits of both types of packaging can be shared.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a preferred embodiment of the package of the present invention.

FIG. 2 is a process diagram for manufacturing the package of this example.

FIG. 3 is a diagram showing a center seal portion of the package.

[Explanation of symbols]

1 tray 2 Packaging film 3 Packaging 4 Ears 5 Center seal part 7 Intermediate packaging 8 Upper space 9 Storage items

Claims (1)

[Scope of utility model registration request] Claim 1: In a shrink package formed by heating a packaging film surrounding an object to heat shrink the packaging film, the packaging film is made of a material having good heat shrinkability and gas permeability. 1. A shrink package, characterized in that it is made of a thin film material and that the packaging film does not have through holes for degassing during heating.