JP2564333B2 - Packaging body and packaging method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a package formed by wrapping a product with a heat-shrinkable synthetic resin film, and a packaging method thereof.

[Conventional technology and problems]

BACKGROUND ART Conventionally, as a product packaging with a heat-shrinkable synthetic resin film, there is known a product which is wrapped with a film and at the same time one end of the film is polymerized on the outer surface of the film to thermally bond the polymerized part. In order to improve the unsealing property of such a package, Japanese Unexamined Patent Publication No. 62-168872 and Japanese Unexamined Utility Model Publication No. 60-167780 disclose a configuration in which a cut tape is provided at a polymerized portion. However, in such a configuration, there is a problem that a special device must be installed in the packaging system in order to insert the cut tape into the overlapping portion in the packaging process. Japanese Utility Model Laid-Open No. 59-186262 discloses a structure in which a rupture portion is formed on a film after packaging and a cut tape is attached to the rupture portion. However, in this case, a special device for processing the cut portion is required, and if the packaged material is a soft or brittle material, there is a possibility that the packaged product may be damaged.

In view of the above problems, the present invention has been made for the purpose of obtaining a packaging body and a packaging method thereof, which are obtained by a packaging machine having a simple structure without damaging the object to be packaged, and have excellent unsealing property. Is.

Incidentally, Japanese Utility Model Laid-Open No. 57-3661 discloses a package having a notch at the end of the film, but this notch is raised from the outer surface of the film when the polymerized part of the film is bonded. Therefore, it does not imply the constitution of the present invention.

[Means for solving problems]

The present invention, after forming a notch in advance at one end of the heat-shrinkable synthetic resin film, wraps the packaged object by this synthetic resin film, and the end in which the notch is formed at the other end of the film. By polymerizing on the outer surface in the vicinity of the end part, a tubular body of a heat-shrinkable synthetic resin film is formed around the packaged object, and the tubular body is crushed by a fusing cutter before and after the packaged object to heat it. After adhering and cutting at that part, after forming the package with the heat-shrinkable synthetic resin film in this way,
By adding the process of heating the whole and heat shrinking the film, the end part where the cut is formed is heat bonded to the vicinity of the other end, and the edge of the cut is heat shrunk and heat deformed into an arc shape. The edge is thicker and harder than the other part, and it is difficult to heat-bond to the film on the other end, so it is easy to hook the nail or peel it from the end of the other film. Provided are a packaging body and a packaging method which are characterized in that they form a tongue piece.

〔Example〕

 Hereinafter, the present invention will be described based on the illustrated embodiments.

FIG. 1 shows a package 10 according to an embodiment of the present invention. The package 10 is formed, for example, by wrapping a rectangular parallelepiped object to be packaged with a sheet of heat-shrinkable synthetic resin film made of vinyl chloride, polypropylene, polyethylene, or the like.
That is, the film is stretched along the surface shape of the article to be packaged, and does not have a substantially large gap with the article to be packaged. In the packaging step, the opening formed in the edge portion 11 of the package is sealed by heat welding, and the polymerized portion 12 at the end of the film is joined by heat bonding. In FIG. 1, the broken line B indicates the end of the film located on the lower side, and the overlapping portion 12
The part between the broken line B and the chain double-dashed line I is adhered to each other by heat bonding, but the plurality of tongues 13 formed on the outer side of the chain double-dashed line I have a broken line B with respect to the lower film. Is not as strongly bonded as the portion between the two-dot chain line I. Further, the edge 14 of the tongue piece 13 has an arc shape, and the thickness of the edge 14 is thicker than the other portions. Therefore, the tongue 13 is slightly stiffer than the other parts,
It is easily raised by hooking the rim 14 with a fingertip. That is, the package 10 can be opened by pinching the tongue piece 13 with a finger and pulling it, whereby the film is broken.

The edge 14 of the tongue piece 13 has an arc shape as described above,
In the middle of the packaging process, that is, before heating the film of the package 10, as shown in FIG. 2, the film has a U-shape due to the edge 15 and the notch 16 of the film. That is, the ends of the film are formed with notches 16 at substantially equal intervals before wrapping the object to be packaged, and the ends having these notches 16 are formed on the outer surface of the other end of the film in the packaging process. Polymerized. Then, the polymerized portion 12 is heated in the process of heat-shrinking the film and is heat-bonded to each other. At this time, the edge 15 and the notch 16 forming the edge of the tongue piece 13 are thermally contracted, and are thermally deformed into an arc shape as shown in FIG. That is, the film thickness of the edge 14 becomes thicker than the other portions due to this heat shrinkage, and the tongue 13 becomes stiff. However, since the edge 14 is thick, the heat capacity of this portion is larger than that of the other portions, and therefore, it is difficult to thermally bond to the lower film. Further, since the edge 14 is thick, it is easy to hook the nail when opening. Therefore, the tongue piece 13 can be easily peeled off from the lower film.

FIG. 4 shows a manufacturing method of the package 10, that is, a packaging process. The synthetic resin film 21 is wound and held on a roll shaft 22, and after being pulled out from the roll shaft 22, cuts 16 are formed at one end portion at substantially equal intervals by a cutter (not shown). After that, the film 21 is formed by a molding device (not shown).
Both ends of the film are bent and deformed in the direction of the arrow A, and a housing space 23 is formed in the film 21. At this time, the end portion having the notch 16 is overlapped with the outer surface of the lower side, that is, the other end portion in FIG. That is, the overlapping portion 12 is located below the accommodation space 23. Further, at this time, the front portion of the film 21, that is, the front edge portion 17 of the housing space 23 is heated and cut by the fusing cutter 24. As a result, the upper film and the lower film are bonded to each other at the front edge portion 17, and the packaged object C is inserted from the opening of the accommodation space 23 along the arrow D.

The package 10 enclosing the package C is delivered to the conveyor 25, and after this delivery, the trailing edge 18 of the package 10 is melted by the cutting cutter 24.
Is cut by That is, the package 10 is separated from the following film 21. In this state, the film of the package 10 has a gap with the object to be packaged, but while being transferred by the conveyor 25 and passing through the heating device 26,
The film is heated, whereby the film is heat-shrinked and comes into close contact with the surface of the packaged object. In the previous step, the film has small holes, and the air in the film is released to the outside through the holes when the film is thermally contracted. At this time, the surface of the conveyor 25 is also a heating device.
It is heated by 26, and by the heat of this conveyor 25,
The polymerized portion 12 is heat bonded. Next, the package 10 exits the heating device 26, is cooled, and sent to the next step.

The cuts 16 may be perforations, and the intervals between the cuts 16 may be irregular.

〔The invention's effect〕

As described above, according to the present invention, a packaging machine having a simple structure in which a normal cutter is simply incorporated can obtain a package having excellent openability without the risk of damaging the object to be packaged. .

[Brief description of drawings]

 FIG. 1 is a perspective view showing a package according to an embodiment of the present invention, FIG. 2 is a perspective view showing the package before heat shrinking, and FIG. 3 is a plan view showing a polymerized portion of the film. The figure is a perspective view showing a packaging step. 10 …… Package, 12 …… Overlapping part, 13 …… Tongue, 14 …… Edge, 16 …… Notch, 21 …… Synthetic resin film, C …… Package.

Claims (2)

(57) [Claims] 1. A wrapping direction of the film, comprising: an object to be packaged and a heat-shrinkable synthetic resin film which is wound on the object to be packaged to form a closed bag and which is entirely heat-shrinkable. In order to form a tubular body of the film by superimposing the terminal end on the starting end of the film, a polymerized adhesive part formed by bonding the polymerized part to each other by heating, and before winding the film around the packaged object. A tongue piece formed by a notch provided in advance at the end in the winding direction of the film, an arc-shaped tongue piece that is thermally deformed by heating and has a thick edge and an arc shape; Thermally bonded ends on both sides formed by crushing the tubular body at both ends of the packaged object and thermally adhering the tubular body to close the tubular body in a bag shape and cutting at the closed portion. Package, characterized in that it comprises a part, everything. 2. A cutting step in which a tongue piece is formed by previously making a cut at an end of a heat-shrinkable synthetic resin film before the start of packaging, and the synthetic resin film is wrapped around an object to be packaged, and a start end in a winding direction is provided. A film winding step of forming a tubular body by stacking the ends as the end portions to which a cut is added, and the tubular body of the film is crushed by a fusing cutter before and after the packaged object, While heat-adhering and closing the tubular body in a bag shape, an edge adhesion cutting step of cutting in the closed portion, and heating the polymerized portion of the start end and the end in the winding direction of the film to mutually Adhesive and arc-shaped tongue-forming step of heat-bonding and heat-deforming the tongue by heating to form an arc-shaped tongue with a thick edge and arc shape, and heating the entire package. And a heat-shrinking step of heat-shrinking the entire film.