JPH089390B2 - Cylindrical packaging material that is easy to open and close - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging material in which one end or both ends of the packaging material are opened, and the opening can be easily opened and closed.

(Prior Art) Conventionally, as a packaging material made of synthetic resin that can be hermetically closed and can be opened and closed as needed, a tubular film with both ends open or a normal bag with three non-opened sides There is a tubular packaging material that is used in the former case, especially when packing a group of products with irregular shape or variable length, such as large fish, vegetables, trees, etc. It is also used for long scrolls such as carpets.

In order to seal the openings of these tubular packaging materials, it is difficult to bunch the openings and tie them with a string, wind a rubber band or tie the openings together. There are also things to do.

However, in the case of these conventional methods, the sealing property is good, but the complexity of paying attention to storage to prevent loss of the unraveled string, or the difficulty of removing the tightened rubber band, etc., A tubular shape that can damage the opening of the bag when unfastening the tied opening, and it is difficult to carry the heat sealer everywhere for sealing, can be repeatedly opened and closed, and can be sealed when closed The advent of tubular packaging materials such as films and ordinary bags has been desired. Various proposals have been made to solve these problems. For example, a packaging material (Japanese Utility Model Laid-Open No. 58-19941) that can be immediately sealed by arranging plastic metal thin wires along the generatrix of a bag made of a tubular film and twisting the mouth of the bag, or the metal. A packaging material for fixing a thin wire by adhering a bag made of a tubular film and a narrow tape (Japanese Utility Model Laid-Open No. 49-55774 / 58,
However, according to this technique, the metal thin wires are twisted while being sandwiched between the bag forming films or between the bag forming film and the narrow width tape, and thus the plasticity of the metal thin wires is improved. In addition to sealing by using, the thin metal wire covered with a film or naked is attached to the bag in parallel with the opening and used for sealing as required. However, in the former case, since the thin metal wire is twisted in the generatrix direction of the metal wire while being covered with the film or tape which is a part of the packaging material, there is a drawback that a sufficient twisting effect (sealing) cannot be obtained. In the latter case, the thin metal wire is already in a bare state in use, so the sealing property is good, but once it is bonded to the bag, the position to twist and tighten cannot be changed in the length direction of the bag, so the contents of the bag There was no flexibility in the sealing position depending on the quantity of material. From these points, further improvement of the packaging material in which the metal thin wire is attached to the tubular packaging material has been desired.

(Problems to be Solved by the Invention) Therefore, according to the present invention, the thin plastic metal wire is enclosed along the generatrix of a tubular packaging material such as a tubular film or a bag, but the opening is sealed very easily and hermetically. It is an object of the present invention to provide a tubular packaging material that can be closed and can be closed at a desired position in the generatrix direction.

(Means for Solving the Problem) As a result of earnest research to obtain a tubular packaging material having the above characteristics, the present inventor has achieved it by attaching a thin metal wire with a special tape to a synthetic resin film. And completed the present invention.

That is, the gist of the present invention is that a plastic metal thin wire is interposed between the synthetic resin tubular film and at least one narrow tape arranged along the generatrix thereof, and the metal thin wire is A tubular wrapping material which is adhered to a film by adhering the narrow tape to the film, and is a tubular wrapping material in which a vertically tearable tape is used as the narrow tape and which can be easily opened and closed. Hereinafter, the present invention will be described in detail.

The material of the synthetic resin tubular film used in the present invention is not particularly limited, and any synthetic resin film widely used for packaging materials can be used. That is, in addition to the most common polyethylene film, polypropylene film, polyester film, polyvinyl chloride film, etc., nylon film, vinylon film, polyvinylidene chloride film, etc. are suitable.

The tubular film referred to in the present invention refers to not only a tubular film in which a bottom portion is not formed, but also a bag formed by forming a bottom portion in a tubular film, and the tubular film is flat in addition to those formed by an inflation molding method. It also includes a film formed by adhering a film in a tubular shape.

The vertical tearable narrow tapes arranged along the generatrix of these films may be cellulosic paper or synthetic paper as well as synthetic resin films, but in the cellulosic paper, the constituent fibers have a certain lengthwise direction. It must be oriented in the same way, and the same can be said for synthetic paper made from fibers. However, synthetic paper or synthetic resin film made of film must be stretched in the longitudinal direction.
When attempting to separate the thin metal wire described below from the tubular film by the orientation of these fibers or the stretching treatment of the film, the narrow tape is easily torn vertically to form a thin metal wire of a desired length from the tubular film. The part is separated and used for fastening. Suitable materials for such tapes include cellulosic paper, cellophane paper, polystyrene-based synthetic paper,
A polypropylene stretched film is preferably used.

As a method for adhering these tapes to the tubular film, a generally known method is sufficient, and a method using an adhesive or a pressure-sensitive adhesive as well as a method using heat adhesion are of course suitable.

A thin plastic metal wire is arranged between the tape and the tubular film, but the thin metal wire remains in a wound state when wound around an object, and can be easily rewound in the original direction if necessary. Is a fine metal wire that can be plastically deformed without being broken, and specifically, a mild steel wire rod which is usually used for fastening an article or for manufacturing a wire mesh is suitable. The winding of the wire is usually performed with a fingertip, and thus it is difficult to use a wire having high rigidity. Also, highly elastic materials are not suitable because they cannot be fixed by winding. For example, a piano wire cannot be used.
In short, if it is not plastically deformable, the effect that the openings of the film are gathered together and the wire rod is fixed in the wound state as described later does not produce the effect of sealing.

At least one of these wire rods is arranged along the generatrix of the tubular film, but if the number of wire rods is too large, the sealing property is rather poor and it is not preferable. One piece is enough unless the packaged item is large.

Next, a method for attaching these thin metal wires to the tubular film with a narrow tape will be described.

The tubular film can be easily obtained by the inflation molding method as described above, or by flattening the flat film,
In addition to the method of introducing the thin metal wire between the thin tapes at the same time when bonding the narrow tape to the tubular film, the thin metal wire is preliminarily interposed between the two narrow tapes and both tapes are bonded to each other. A convenient method is to prepare a narrow tape containing fine metal wires and attach the tape to a tubular film or a flat film before being tubularized.

Next, how to use the tubular film with the thin metal wire thus produced will be described. When the film portion of the opening of the tubular film and the thin metal wire portion are separately gripped and pulled in opposite directions, the thin metal wire tears the narrow tape and separates from the tubular film in the shape of a tree branch. The branches are of sufficient length to wrap around and seal the openings in the tubular film. Depending on the length and size of the tubular wrapping material, the normal length is about 5 to 10 cm or 15 to 20 cm.

The method for winding the branch-shaped thin metal wire is not particularly limited, but it is preferable that the portion immediately before the branch is divided is grasped by one side and the openings of the tubular film are gathered together to wind the branch-shaped portion. In addition, it is preferable that the root of the branch portion is once bent in the original direction and then the winding is performed so that the narrow tape with the thin metal wire is not torn gradually during winding.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a plan view of a first embodiment of the present invention, in which a metal thin wire 4 is formed in a high-density polyethylene tubular film 2 and has a narrow width which is made of high-density polyethylene and is longitudinally split. The tape 3 is attached by heat bonding. The tubular film 2 has a bottom 5 formed by heat sealing, and an opening 6 on the opposite side to form a tubular packaging material 1. . Second
The drawing shows the view taken along the line AA of FIG. 1 and subsequent drawings. The same parts as in FIG. FIG. 3 shows a second embodiment in which a tape 7 made by pasting a thin metal wire between two vertically cleaving narrow tapes and adhering the tape 7 to the end of a folded tubular film. As shown in the enlarged view of FIG. 4, the tape has a thin metal wire 4a sandwiched between narrow tapes 3a, 3a. Although the locations where the thin metal wires are separated are different between the case of FIG. 2 and the case of FIG. 3, the object of the present invention is achieved in the same manner.

FIG. 5 is a plan view showing a state where a part of the thin metal wire shown in FIG. 1 is separated from the tubular film by tearing the narrow tape, and 4X is the separated part. In addition,
After the above separation, the torn part of the narrow tape
There are two 4Ys left. FIG. 6 shows a state in which the opening portions of the tubular packaging material are gathered together by the separated thin wires 4X to be wound up.

(Effect) As explained above, the metal wire attached to the packaging material itself is partly separated by using the property of the longitudinal tear tape and wound around the opening, further improving the sealing performance and further If you tear the width tape to the required position,
The thin metal wire can be wound at an arbitrary position of the bag, and all the conventional problems have been solved.

[Brief description of drawings]

FIG. 1 is a plan view of the first embodiment of the present invention, and FIG.
FIG. 3 is a sectional view of the tape used in the embodiment of FIG. 2, FIG. 4 is a sectional view of the tape used in the second embodiment, and FIG.
FIG. 6 is a plan view showing a state in which a part of the thin line in the figure is separated, and FIG. 6 shows a state in which the opening is closed by using the separated thin line and sealed. The main symbols used will be described below. 1 …… Cylindrical packaging material 2 …… Tubular film 3,3a …… Vertical tearing narrow tape 4,4a …… Plastic metal wire 4X …… Separated metal wire

Claims (1)

[Claims] 1. A plastic metal thin wire is interposed between a synthetic resin tubular film and at least one thin tape arranged along a generatrix thereof, and the thin metal wire is the film and the thin film. A tubular packaging material which is fixed to the film by adhesion with a narrow tape, wherein a vertically tearable tape is used as the narrow tape, and the tubular packaging material is easy to open and close.