JPH053157U - Package - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a package which can be opened with a comparatively small force even if the center seal portion has a strong adhesive force due to heat shrinkage. A packaging body in which the packaging film is contracted by heating an intermediate packaging body in which the tray 2 in which the articles to be packaged are stored is heated with a packaging film 3 having a good heat shrinkability, and the packaging film is adhered to the tray. 1 is manufactured. In such a package, a center seal portion 7 is formed at a predetermined position where the side edges of the packaging film are superposed and bonded to each other, and the center seal portion is also shrunk by heating to have a strong adhesive force. Then, two parallel perforations 8, 8 are formed along both side edges of the center seal portion 7,
The center seal portion is removed and separated from the packaging film through the perforations, so that the packaging body is opened with a small force.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a package, and more particularly to improvement of a so-called shrink package opening mechanism using a heat-shrinkable film.

[0002]

[Prior Art]

 In the case of a package that is manufactured by enclosing the packaged object in a tray and surrounding it with a film material, use a heat-shrinkable film to prevent the packaged object from separating from the tray. A so-called shrink package is used in which the film is shrink-wrapped by heating and then tightly adhered to the tray. As a result, the edge of the tray opening and the film come into close contact with each other, and the packaged article does not fly out of the tray. Further, in the case of a tray (container) with a lid, the shrink wrapping body may be used for the packaging process in the same manner as above for the reason of preventing the lid from coming off the tray.

[0003]

[Problems to be solved by the device]

 However, the above conventional package has the following problems. That is, in order to manufacture such a package, first, using a normal packaging machine, cover the periphery of the tray with a heat-shrinkable film and seal the polymerized ends of the longitudinal and transverse films by sealing. A sealed intermediate package is manufactured. Then, the intermediate package is heated by passing through a shrink tunnel or the like to be thermally shrunk. Further, each seal portion usually has a predetermined seal width (ear portion), and the center seal portion extending in the longitudinal direction is located on the bottom side of the tray in consideration of the appearance of the product. .

By the way, considering the case of opening the packaging body, the strength of the heat-shrinked film is increasing, and at the time of opening, both films are pulled by pulling the center seal part while pulling up on both sides. Although it is opened along the center seal portion by peeling it off, since the center seal portion itself is also heat-contracted and strongly heat-sealed, it is difficult to separate the polymerized ends of the joined film from each other, and Since it requires force, the opening operability is poor.

As described above, since a very large force is required to open the film, a large force is applied at the moment the film tears, and once the film tears, a small force is applied thereafter. Since the film can be torn, it is desirable to adjust the force applied according to changes in the situation, but such adjustment is difficult in practice, and excessive force is eventually applied to the package. Therefore, the unbalanced force may cause the package to dance in the hand or, in the worst case, drop the package.

In particular, since the center seal portion is located on the bottom surface side, and if the package is opened upside down, the packaged object may drop from the package when the package is opened. Therefore, maintain the vertical positional relationship. Since it is necessary to pressurize the center seal part on the bottom side as it is, the operability is poor and the above problem becomes more prominent.

The present invention has been made in view of the above background, and an object of the present invention is to provide a package having a good opening property even if it is heat-shrinked and the center seal portion has a strong adhesive force. Especially.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the package according to the present invention, the tray containing the articles to be packaged is covered with a heat-shrinkable film, and the polymerized end of the film is sealed to produce an intermediate package. And a package formed by heating the intermediate package to heat-shrink the film, the package having a center seal portion of a predetermined width on the bottom side of the tray, Perforations were formed on both sides of the center seal part.

[0009]

[Action]

 To open the package according to the present invention, while grasping the center seal portion and the like, pull it along the extending direction of the center seal portion. Then, the center seal is cleanly removed along the perforations formed on both sides of the center seal. Since the perforations are formed, the force required for opening the package can be small.

[0010]

【Example】

 Hereinafter, preferred embodiments of the package according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a perspective view of a package 1 according to an embodiment of the present invention as seen from the bottom side thereof. As shown in the figure, the packaging body 1 according to the present example has a flat rectangular tray 2 having an upper opening, which is surrounded by a packaging film 3 having a good heat shrinkability in a hermetically sealed state. The intermediate wrapping body formed by being surrounded by is heat-shrinked by passing it through a shrink tunnel or the like, and the wrapping film 3 is adhered to the tray 2.

An object to be packaged (not shown) is stored in the tray 2, and a lid (not shown) is attached to the upper opening of the tray 2. The lid and the tray 2 are in a lightly fitted state, and the final locking force between them is obtained by the adhesion of the packaging film 3. The items to be packaged include lunch boxes and other food items, but the scope of the present invention is not limited to these. .

Furthermore, in this example, when manufacturing the sealed intermediate package before heat shrinking, a so-called pillow packaging device is used. As a result, the intermediate package, and thus the final package 1, is provided with the end seal portion 5 having a predetermined width in a direction orthogonal to the traveling direction during packaging processing (the longitudinal direction of the package 1 in this example). Also, a center seal portion 7 having a predetermined width is formed in the same direction as the traveling direction.

More specifically, the end seal portion 5 is arranged at a substantially central position in the height direction of the short side wall 2 a of the tray 2 along the direction in which the side wall 2 a extends, and the end seal portion 5 is provided. Since 5 also shrinks due to heat, both the width and the length are shorter than that of the end seal portion in the case of the intermediate package, and as shown in the figure, the length is shorter than that of the side wall 2a. There is. In this example, the end seal portion 5 has been described as having a predetermined width, but the present invention is not limited to this, and may be, for example, a fusing seal or the like to form an end seal portion having no seal width.

On the other hand, the center seal portion 7 superimposes the end portions of the packaging film 3 at the time of manufacturing the intermediate packaging body, and at the same time, the ends of the packaging film are bonded and integrated with each other by heat sensitivity or the like, and the bottom side of the tray 2 is formed. It is located on the center line of. The center seal portion 7 is also heated and thermally contracted, and in the final state of the package 1, the seal width w becomes narrower than that in the intermediate package, and the adhesive force also increases. There is.

Here, in the present invention, perforations 8, 8 are formed near both sides in the longitudinal direction of the center seal portion 7. As a result, two parallel perforations 8, 8 are formed in the packaging film 2 on the bottom side of the package 1 along the longitudinal direction. Therefore, even if the adhesive force of the heat-shrinked center seal portion 7 is strong, the center seal portion 7 is removed from the packaging film 2 through the perforations 8 and 8 to easily open the package 1. be able to.

[0016]

[Effect of the device]

 As described above, in the package body according to the present invention, perforations are formed on both sides of the center seal portion along the direction of the center seal, so that the center seal portion can be positioned on both sides only by picking it up. Since the perforations are cut, the center seal can be separated from the package by holding it with a small force. Since the packaging film that has been torn once can be torn in a predetermined direction with a small force, it does not require much force when opening.

Furthermore, since the opening can be performed with such a small force, the force required immediately before and immediately after the film is first torn does not change so much. Even if the container cannot be turned upside down, the package can be reliably opened without dropping the object to be packaged or the like.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Package 2 Tray 3 Packaging film 7 Center seal part 8 Perforation

Claims (1)

[Claims for utility model registration] [Claim 1] A tray containing an object to be packaged is covered with a heat-shrinkable film, and the polymerized end of the film is sealed to produce an intermediate package, which is an intermediate package. Is a package formed by heating the film to heat-shrink the package, the package having a center seal portion of a predetermined width on the bottom side of the tray, along the center seal portion. A package having perforations formed on both sides thereof.