JPH078262U - Package - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a package which can be opened and held 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 in close contact with 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. The center seal portion is also shrunk by heating to have a strong adhesive force. Then, perforations 8, 8 are formed on the bottom surface of this packaging film along both side edges thereof, and by grasping from both sides of the packaging body and moving the bottom side fingertips to the side edges, the fingertips abut. The film portion to be moved also follows and is separated through the perforations, and the package 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 manufactured by surrounding the package with a film material in the tray, use a heat-shrinkable film to prevent the package from separating from the tray. A so-called shrink wrapping body is used in which the film is shrink-wrapped by heating and then brought into close contact with the tray after being sealed and packaged. As a result, the edge of the tray opening and the film come into close contact with each other, preventing the packaged object from popping 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 film in the longitudinal and transverse directions 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 vertical 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 package, usually, the center seal part is picked up and pulled to both sides to peel off both films, and thereby the package is opened along the center seal part. The strength of the heat-shrinked film is increasing, and the center seal part itself is also heat-shrinked and strongly heat-sealed, so it is difficult to separate the polymerized ends of the joined films, and a considerable force is applied. Since it requires a pallet, the opening operability is poor.

As described above, since a very large force is required to open the bag, 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.

[0006] In particular, the center seal portion is located on the bottom side due to the appearance requirements of the product, and if the package is opened upside down, the packaged item may drop from the package when the package is opened. However, since the center seal part on the bottom side must be pulled while maintaining the vertical positional relationship, the operability is poor and the above problem becomes more prominent.

On the other hand, if a tape for unsealing is adhered to a predetermined position (top surface, side surface) of the film and the film is cut by pulling the tape, the unsealing becomes easy, but The bonding work is complicated and the cost is high.

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.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, a tray accommodating an object to be packaged is covered with a heat-shrinkable film, the polymerization end of the film is sealed to produce an intermediate package, and the intermediate package is produced. Basically, the package is formed by heating at least the periphery of the end seal part of the body to thermally shrink a predetermined part of the film, and the package has a center seal part having a predetermined width on the bottom side of the tray. Then, perforations were formed along the side edges of the film portion on the bottom surface side.

[0010]

[Action]

 In order to open the package according to the present invention, the opposite side surfaces of the package are gripped while maintaining the upper and lower (top and bottom) positions. Then, if held normally, the fingertips of the four fingers other than the thumb will pinch the film portion on the bottom surface side, and the perforations will be located closer to the center than the fingertips. When the fingertip on the bottom side is moved to the side edge in that state, the film portion with which the fingertip is in contact and the periphery thereof are also moved to the side edge side following the movement. On the other hand, the film part on the center side of the tip of the fingertip (particularly the film part on the center side of the perforation) is kept at that position. As a result, the perforations are cut, the film portion on the side edge (outer side) of the perforations is cut off, and the package is opened. Since the perforations are formed, the force required for opening is small.

[0011]

【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 viewed from the bottom side thereof. As shown in the figure, the packaging body 1 according to this example has a heat-shrinkable environment in a tray 2 made of expanded polystyrene having a flat rectangular shape with an upper opening (a material having low adhesion to the packaging film 3). The packaging film 3 is tightly surrounded by the packaging film 3 and the intermediate packaging body formed by surrounding the packaging film 3 in the sealed state is heated and shrunk by passing through a shrink tunnel, and the packaging film 3 is wrapped in the tray 2. It is formed by closely adhering to.

An object to be packaged (not shown) is stored in the tray 2, and a transparent plastic lid (a material having high adhesion to the packaging film 3) is provided in the upper opening of the tray 2 (see FIG. (Not shown) is installed. The lid and the tray 2 are in a lightly fitted state, and the final locking force between them is obtained by the adhesive force of the packaging film 3.

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 (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 part 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 extending direction of the side wall 2 a, and the end seal part 5 is also disposed. Since 5 also shrinks due to heat, both the width and the length are shorter than those 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 due to heat sensitivity or the like, and the bottom side of the tray 2 It is located on the center line of. Then, 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. Then, the center seal portion 7 may be formed by a fusing seal or the like as described above.

In the package manufactured as described above, the adhesiveness between the packaging film 3 and the lid is greater than the adhesiveness with the tray 2. In other words, when the tray 2 and the packaging film 3 are relatively slippery and a biasing force in a predetermined direction is applied to the packaging film 3, only the packaging film 3 can move in the biasing direction. There is.

Here, in the present invention, perforations 8 are formed in the film portion on the bottom surface side along both longitudinal edges of the bottom surface of the package 1. That is, the perforations 8 are arranged in parallel with the side edges of the bottom face with a predetermined gap. The distance between the perforations 8 and the side edge is such that the fingertip of the finger that has come to the bottom side when the person trying to open the package 1 grasps both side edges without being particularly conscious. It is adjusted so that the perforation 8 is located slightly closer to the center than the fingertip.

Therefore, even if the heat-shrinked center seal portion 7 and end seal portion 5 have a strong adhesive force, if they are gripped from both sides of the package 1 and the fingertips on the bottom side are moved to the outside, the perforations 8 will be removed. The film portion 3a on the outer side of the boundary tries to move following the movement of the fingertip thereof, and the film portion 3b on the center side tries to stay at that position. Therefore, both film portions 3a, 3a, 3b is cut and cut. With this, the package 1 can be easily opened.

Although the perforations 8 are provided on both sides in the above embodiment, they may be provided on either one. The items to be packaged include bento and other food items, but the scope of the present invention is not limited to these. Further, although the heat shrinking portion is the whole packaging film (passing through the shrink tunnel etc.) in the above-mentioned embodiment, the present invention blows heat air or the like to at least the peripheral edge of the end seal portion 5 to heat shrink. All you need is to be able to support it.

[0020]

[Effect of device]

 As described above, in the packaging body according to the present invention, since the perforations are formed at the predetermined positions on the bottom side along the side edges, the fingertips located on the bottom side with the packaging body held from both sides are formed into a film. The perforation is cut by simply moving it to the side edge (outer side) in the state of being in contact with, so that the package can be opened 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.

Further, since the opening can be performed with such a small force, the force required immediately before and immediately after the film is first torn is not significantly changed. 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.

In addition, such perforations can be easily formed during withdrawal of the packaging film (the stage before forming into a tubular shape), and the workability thereof is higher than that of attaching an opening tape. Good and low cost.

[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 5 End seal part 7 Center seal part 8 Perforation

Claims (1)

[Scope of utility model registration request] 1. A tray containing an article to be packaged is covered with a heat-shrinkable film, the polymerized end of the film is sealed to produce an intermediate package, and at least the periphery of the end seal part of the intermediate package is heated. And a packaging body formed by heat-shrinking a predetermined portion of the film, the packaging body having a center seal portion having a predetermined width on the bottom surface side of the tray, and having a center portion on the bottom surface side. A package having perforations formed along the side edges thereof.