JPH0610018B2 - Method for opening package with heat-shrinkable synthetic resin film - Google Patents

Description

The present invention relates to a method for opening a package with a heat-shrinkable synthetic resin film.

[Prior Art] Conventionally, as a method for unsealing a package with a heat-shrinkable film, in a package covered with a synthetic resin film, a perforation for opening is attached at an appropriate position of the film, or After printing the non-adhesive ink on the inner surfaces of the opposite edges to be joined, the inner surfaces of the edges to be joined to each other in the film are polymerized when the packaged object is wrapped with this film, and A so-called gas-sealing type seal that projects outward from the package and is heat-sealed to leave only the printed parts that overlap each other on both edges unbonded and after heat shrinking, this unbonded part serves as an opening. (Japanese Patent Publication No. 47-5160) There has been one in which a label is attached to an edge portion of a heat-shrinkable synthetic resin film, and then the label is envelope-wrapped in a tubular shape.

[Problems to be Solved by the Invention] However, the method of attaching a perforation has major drawbacks such as enlargement of the perforation hole during heat shrinkage and spontaneous opening by cutting from the perforation portion during handling.

On the other hand, in the case of employing the so-called gassho seal method, the joint portion is deformed or contracted due to the heat seal method, and the joint portion projects to the outside of the package, so that the appearance is deteriorated.
Further, even when the packages are stacked, there is a drawback that the protruding palm-sealing portion becomes an obstacle and causes an unstable state.

Further, in the case where a film having a label attached to the end edge of the heat-shrinkable synthetic resin film is wrapped in an envelope, the label is sandwiched between the seal parts of the envelope-attached package, that is, the overlapping portions of both end edges of the film. Since the tape is adhered over its entire width in the opened state, the contraction in the lateral direction of the part to which the label is adhered during heat shrinkage is larger than that of other seal parts, and the film in the label adhered part is contracted. The overlap of both edges is less than that of other seal parts, resulting in poor finish. Further, when the label is opened, even if the label is pulled, there is no cut end, so that the film is not easily cut and the label cannot be easily opened.

[Means for Solving Problems] An object of the present invention is to eliminate these drawbacks and to provide a method for opening a package with a heat-shrinkable film, which can provide a package with a particularly beautiful appearance.

That is, according to the present invention, the edge portion of the heat-shrinkable synthetic resin film is perforated along the flow direction, and a label is attached at a suitable position slightly near the center of the film from the perforation portion, and then the film is electrostatically sealed. When packaging with an envelope, the perforated part and a part of the label are in a tubular shape so that they are on the inner surface of the joining surface of the envelope. In the formed package, the film is cut from the perforation portion by pulling the label toward the central portion at the time of opening, so that the label can be easily opened.

The label used in this method is a paper, a synthetic resin film metal foil or a laminate of these laminated with an adhesive,
The label is provided so as to protrude from the electrostatic seal portion of the film, and when the label is opened, the label is pulled by a finger to open the label. Incidentally, it is preferable that this label does not have an adhesive at the picking portion, that is, the portion protruding from the electrostatic seal.

An electrostatic seal is a type of blocking caused by applying static electricity from a static electricity generator to the sealed area where the materials to be packaged, for example, synthetic resin films are superposed, instead of the conventional heat sealing plate, and the entire width of the seal is covered. A wide range of films can be brought into close contact with each other, and the electrostatically sealed portion has a flat, transparent and beautiful appearance with no seal marks on the appearance.

Next, an embodiment of the present invention will be described with reference to the drawings. First, perforation 2 processing is applied to the edge portion of the heat-shrinkable synthetic resin film 1 along the flow direction of the film. The position where this perforation is applied is within the width of the electrostatic seal 4 at the edge of the inner surface film when the films are overlapped with each other when they are envelope-wrapped by the electrostatic seal.

Then, the label 3 is attached at an appropriate position slightly closer to the center of the film from the perforation processed portion in the direction perpendicular to the perforation. Further, it is preferable that the label is attached to a position as close to the perforation as possible, and further, the size of a part of the label is projected from the width of the electrostatic seal.

Then, the perforated film 1 and the label-attached film 1 are electrostatically sealed so that the perforation portion and the label are on the inner side of the joint surface, and continuously made into a tubular shape. After that, a fusing seal 5 is formed in a direction perpendicular to the electrostatic seal 4.

[Advantages of the Invention] In the package obtained as described above, the label is attached to a position slightly closer to the center than the perforation portion provided at the edge of the heat-shrinkable synthetic resin film, and thus the envelope-attached package In the seal part of the label, the part where the label is attached is not sealed, but since the edge is electrostatically sealed from the label attachment position, the label attachment part does not contract abnormally during heat shrinkage, The seal part has a strong adhesive strength, is transparent, and has a beautiful appearance with no heat seal mark.

Furthermore, since the perforation portion is covered with the outer surface film during the heat shrinkage, the perforation portion is in close contact with the outer surface film, so there are no troubles such as enlargement of the perforation holes and bag breakage when transferring the package. Tight packaging is possible.

When the package obtained in this manner is opened, the gripping portion of the label 2 is pulled and pulled toward the center, whereby the film is cut from the perforation portion of the film inside the electrostatic seal portion, and the label can be opened very easily.

Furthermore, if a JIS standard bar code symbol (post mark) is printed on this label, it is useful for managing the sales and inventory of the packaged object.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat-shrinkable synthetic resin film in which a perforation process is applied to the film edge and labels are attached at regular intervals. FIG. 2 is a heat-shrinkable synthetic resin film provided with an opening part by the method of the present invention. It is a perspective view of the package by a synthetic resin film. Further, FIG. 3 is an enlarged view of a portion where a label is attached. 1 ... Heat-shrinkable synthetic resin film 2 ... Perforation part 3 ... Label 4 ... Electrostatic seal 5 ... Fusing seal 6 ... Packaged item

Claims (1)

[Claims] 1. A heat-shrinkable synthetic resin film is perforated along the flow direction, and a label is attached to the edge of the heat-shrinkable synthetic resin film at an appropriate position slightly closer to the center of the film. When packaging with a seal in a tubular form, the perforated part and a part of the label are in a tubular shape so that they are on the inner surface of the joining surface of the envelope, and after the items to be packaged have been sent in, the fusing seal is performed by the front and rear seal. A method of unsealing a package with a heat-shrinkable synthetic resin film, which allows the film to be easily opened by pulling the label toward the center when opening the package formed by heat shrinking.