JP2548609B2 - Easy-open packaging bag - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a packaging bag that is easily opened by using a part of a packaging bag body as a tear tab.

(Prior Art) Conventionally, after forming a packaging bag using a base material such as a plastic film or a metal foil or a composite base material in which these base materials are laminated as a soft package, and storing the contents. , A method of blocking the opening is performed. In order to take out the contents from these packaging bags, it is generally opened by tearing a part of the packaging bag by hand, but in order to facilitate tearing, make a cut in the sealing part of the outer edge of the packaging bag or use a cut tape. A method of adhering a so-called unsealing plastic tape to a portion to be torn of a packaging base material, a method of forming a weakening line by using radiation or heat, and the like have also been studied.

(Problems to be solved by the invention) However, a so-called V-notch, I-
If a notch such as a notch is provided, there is a problem that other packaging may be damaged during the distribution process, and it is not possible to set a structure that opens only one side of the packaging bag. Since the opening is performed by cutting, there is a problem that the contents are easily spilled.

In addition, the method using the cut tape complicates the bag making process, and there are problems that the tape cannot be opened because the tape is often broken, and the method of forming the weakening line is not always good in reproducibility at present. Instead, it is easy to open the case.

(Means for Solving the Problem) As a result of repeated studies in view of the above circumstances, the present inventors have found that
The back side of one edge of the packaging substrate is laminated on the front side of the opposing edge to form a cylindrical shape, and an adhesive band is provided along the axial direction of the cylinder between the overlapping portions, and then the cylindrical In a so-called envelope-clad type packaging bag that is often found in pillow packaging, stick packaging, etc. obtained by sealing both ends, an adhesive band provided when forming a cylinder is located at a position away from the base material edge above the overlapping portion. A non-adhesive region between the end edge portion and the adhesive band, at least two or more adhesive parts being directly adjacent to or apart from the adhesive band, and the edge corresponding to the adhesive part. In the part, two tears having a predetermined width and having a length that does not reach the adhesive portion are made to be a tear tab,
Furthermore, by arranging the at least two adhesive parts so that the cuts that progress by pulling the tearing strip pass through between them, an easy-open packaging bag in which the above problems are solved is obtained. The inventors have completed the present invention by discovering that they can be produced.

The base material for forming the easy-open packaging bag of the present invention is not only a general-purpose plastic film such as polyethylene, polypropylene, polyethylene terephthalate, but also a functional film such as nylon or polyimide film and one of these films A composite film obtained by laminating the above, a metal foil such as an aluminum foil, or a composite material of these metal foils and one or more of the above plastic films, and these plastic films or metal foils with glassine paper, thin paper, etc. Known films such as composite materials, metal foils and papers are used.

Printing may be performed on these base materials, and a treatment such as a coating material for improving surface properties such as gloss and heat resistance, a heat-sealing adhesive for imparting heat-sealing property, and the like may be performed if necessary. It doesn't matter.

Further, for plastic films and papers, those obtained by vapor deposition of a metal such as aluminum are also useful.

The plastic film is treated with a mixture of inorganic / organic fillers and different kinds of plastics, or with improved tearability by a stretching process during extrusion molding. It is used as a packaging material. Those are preferable as the base material used in the application of the present invention.

In the manufacturing process of the easy-open packaging bag of the present invention, the back side of one edge of the packaging base material is overlapped on the front side of the opposing edge to form a cylindrical shape, and the cylindrical axis is provided between the overlapping layers. Although it is necessary to provide the adhesive band along the direction, the adhesive band may be formed by applying an appropriate adhesive between the overlapping portions in an arbitrary pattern and adhering it, If either or both of the front surface and the back surface are heat-sealing, they may be formed by heat-sealing in an arbitrary pattern as they are.

(Operation) Usually, as a method of providing an easy-opening mechanism on the flat surface of a soft packaging bag such as stick packaging or pillow packaging, the back side of one edge of the packaging base material made of a plastic film or a metal foil laminated plastic film is used. Are overlapped with each other on the surface side of the opposing edge to form a cylindrical shape, an adhesive band is provided along the axial direction of the cylinder between the overlapping portions, and then the contents are stored and the both ends of the cylinder are sealed by packaging. In the process of completing the process, an adhesive band provided at the time of forming the cylinder is provided at a position apart from the base material edge portion on the upper side of the overlapping portion, and the cylindrical axis is provided at two positions relatively close to the base material edge portion on the upper side of the overlapping portion. Make a cut in the vertical direction, make the edge between the cuts a tear tab, and pull this piece in the direction opposite to the cut edge to make a strip-shaped opening in the wall of the packaging bag to open it. Is to be carried out.

However, when the tear tab is pulled, the cut progresses along the direction of the cut provided on the edge, but when the cut reaches the adhesive band, the cut usually progresses further. Instead, the adhesive band portion is peeled off to cause a so-called laparotomy state in the axial direction of the cylinder, or when the adhesive force of the adhesive band is sufficiently large, the tear tab is cut and the opening cannot be performed.

Similarly, the easy-open packaging bag of the present invention has a cylindrical shape in which a backing side of one edge of a packaging substrate made of a plastic film or a metal foil-laminated plastic film is superposed on the front side of the edge opposite to the edge. The adhesive band provided along the axial direction of the cylinder between the layers of the overlapping part and then sealing the both ends of the cylinder. At least two adhesive portions which are provided at a position distant from the edge portion, and which are directly adjacent to or apart from the adhesive strip between the edge portion and the adhesive strip, and which correspond to the adhesive portions. The tearing tab is formed by making a cut in the edge portion, and with this configuration, the tearing tab piece is pulled along the direction of the cut provided by pulling the tearing tab piece. Is progressing, adhesive band Further cuts across the part is the easily opened proceeds are achieved.

It is sufficient that the adhesive portion is provided so that a cut that advances by pulling the tear tab is almost passed through, and the shape and position are not strictly limited. Position such that it is connected to the adhesive band between the edge of the base material on the upper side of the overlapping portion and the adhesive band in a circular, triangular, quadrangular or arbitrary shape, or a little away from the adhesive band It suffices that at least two or more adhesive portions are provided on the.

Hereinafter, the present invention will be described in more detail by way of examples with reference to the accompanying drawings.

[Example] Admer NE070 (carboxyl group-modified linear low-density polyethylene manufactured by Mitsui Petrochemical Co., Ltd .; Vicat softening point 87)
℃, melt index 1.0) using a blown film extrusion molding machine 30μ thick film on one side of the soft aluminum foil 20μ thick steel heating roll set to 170 ° C and a silicone rubber impression cylinder After temporarily bonding 4 Kg / m with a press roll consisting of
It is held for 10 seconds in a heating furnace with an ambient temperature of 170 ° C, and further laminated by pressing with a press roll set under the same conditions as above to form a heat-sealing layer, and then on the other surface of the aluminum foil of the above-mentioned laminate. Trefan YT-12 (Toray Industries, Ltd. laterally splittable polypropylene film; thickness 40μ) is a polyurethane-based two-part adhesive for dry lamination (Takelac A310 / Takenate A-3, Takeda Pharmaceutical Co., Ltd.).
As a surface layer, a packaging base material having a thickness of 90 μm was prepared by bonding using.

An embodiment of a packaging bag manufactured using this packaging base material is shown in FIG. 1 (plan view of the packaging bag) and FIG. 2 (transverse sectional view of the packaging bag). That is, the back side of one edge of the packaging substrate, that is, the heat-sealing layer is overlapped with the surface side of the opposite edge, that is, the surface layer to form a cylindrical shape, and the width of the overlapping portion is 20 mm, 5mm width along the axial direction of the cylinder from the edge of the upper substrate to the inside of 12mm to 17mm, and the heat-sealing temperature is 180 ℃,
Heat-sealing is performed under the conditions of pressure of 3 kg / cm ² and pressurizing time of 1 second to form an adhesive band, and at the same time, two adhesive parts with a diameter of 1 mm and a distance of 5 mm are placed at a position 3 mm away from the adhesive band toward the edge. It was provided by the operation of heat sealing. Next, a tearing piece having a width of about 5 mm was formed by making a 7 mm incision from the edge along the foot of the perpendicular line drawn from the two-point bonded portion toward the edge. afterwards,
The upper and lower sides of the cylinder were sealed by heat sealing to complete a packaging bag.

When the tearing tab of this packaging bag is pulled toward the adhesive band, a cut progresses, passing through between the two adhesive parts, and when passing through the adhesive band, an opening of about 5 mm width is opened in the packaging bag body. It was possible to easily cut the main body of the packaging bag by continuously pulling it.

There is no effect unless the width of the tearing strip and the distance between the two bonded portions are significantly different, but it is preferable that the width of the tearing strip be substantially equal or rather wide.

FIG. 3, FIG. 4 and FIG. 5 each show another example of how to provide the adhesive portion in the easy-open packaging bag of the present invention, and any of them can be easily opened.

[Comparative Example] The packaging bag shown in Fig. 1 of the example was manufactured without providing an adhesive portion, but when the tear tab is pulled, a break progresses, but resistance increases when reaching the adhesive band. A strong pull resulted in peeling of the adhesive band or cutting of the tear tab.

[Effect] Since the present invention is configured as described above, it is easy to open the package, and it is possible to prevent other packaging bags from being damaged in the distribution process as in the case where the notch is provided on the outer edge of the packaging bag. In addition, there is no need for extra manufacturing processes and materials such as when using cut tape, and there is no possibility that the tape cannot be opened due to tape breakage. The problem of instability does not occur. Further, since the positions where the adhesive band and the tear tab are provided can be set almost arbitrarily, the opening place can be adjusted depending on the form of the contents.

[Brief description of drawings]

FIGS. 1, 3, 4, and 5 are plan views showing an embodiment of the present invention, and FIG. 2 is a sectional view. 1 ... Adhesive band, 2 ... Adhesive part, 3 ... Base material edge part, 4 ...
… Tearing tab, 5 …… Heat-sealed part, 6 …… Surface layer, 7…
… Aluminum foil, 8 …… Heat-sealing layer

Claims (3)

(57) [Claims] 1. A backing side of one edge portion of a packaging base material is overlapped with a front surface side of an opposing edge portion to form a cylindrical shape, and an adhesive band is provided between overlapping layers along an axial direction of the cylindrical portion. In the packaging bag obtained by providing both ends of the cylinder and then sealing the two ends of the cylinder, an adhesive band provided at the time of forming the cylinder is provided at a position apart from the base material end edge part on the upper side of the overlapping part, and adhered to the end part. At least two or more adhesive portions are provided in the non-adhesive region between the adhesive belt and the adhesive belt directly adjacent to or apart from each other, and the adhesive is applied to the edge corresponding to the adhesive with a predetermined width. So that two cuts having a length that does not reach the portion are made into tear tabs, and further, at least two adhesive parts are pulled so that the breaks that progress by pulling the tear tabs pass between them. An easy-open packaging bag characterized by being arranged in a line. 2. The easy-open packaging bag according to claim 1, wherein one small area adhesive portion is provided between each of the two cuts and the adhesive band. 3. The easy-open packaging bag according to claim 1, wherein a large number of small area adhesive parts are arranged discontinuously along the adhesive band.