JPH03289459A - Package with tear tape - Google Patents

Abstract

PURPOSE:To obtain a sufficiently long tear part to unpack a package without using any perforation by a method wherein a film is slit to form a tab piece at a tear starting point and the one end of a pressure-sensitive adhesive tape is positioned at the foward side of the tab piece, extended throughout the tear line over the tab piece and attached to the outer peripheral side of the film. CONSTITUTION:Film 1 is provided with a V-shaped slit 2 at a tear starting point of a package to form a tab piece 3. A pressure-sensitive adhesive tape 4 is applied to the film with the one end thereof positioned at the forward side of the tab piece 3 and extending to cover the tab piece 3. This end of the pressure-sensitive adhesive tape 4 is folded back on its adhesive side to form a grip part 6. When the package is unpacked by tearing off the pressure- sensitive adhesive tape 4, this grip part 6 affords a hold for the fingers to pull the tape 4 and, therefore, makes the tearing easy.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a packaging body using a synthetic resin film, particularly a heat-shrinkable film that covers an object to be packaged. This invention relates to a means for breaking the seal of a shrink package that is brought into close contact with an object.

[Prior Art] Conventionally, the following methods are known as means for breaking the seal of a packaged object covered with a synthetic resin film.

(1) Tack label method (Utility Model Publications No. 41-4514, No. 49-34478) The seal-breaking means of this method forms a tongue piece by cutting at the starting point of the film covering the packaged item.

A tack label is attached to the outer surface of the film to cover this tongue piece.

The seal is broken by peeling off the tack label from the tip end of the tongue formed by the cut and pulling it. That is, when the tack label is pulled around the tack label, the tongue piece is pulled while being stuck to the tack label, and the film starts to be torn in a thin strip shape starting from the notch forming the tongue piece. And after this tearing starts,
The tear caused by tension is caused by the eye's natural propagation action to tear the desired area into strips.

(2) Tack tape method (Utility Model Application No. 81-134959) This method of tearing means forms perforations in the form of a narrow strip along the entire tearing line in the film covering the packaged item, and At the starting point of the seal, a tongue piece is formed by a notch, and a tack tape is attached with one end located on the tip side of this tongue piece.
It is attached to the outer surface of the film, covering the tongue and perforations.

The seal is broken by peeling off the tack tape from the tip of the tongue formed by the cut. In other words, when the tack tape is peeled off, the tongue is pulled while still attached to the tack tape, and the film is torn into a thin strip along the perforation from the notch that forms the tongue, and the seal is broken. be.

(3) Tear tape method (Utility Model Publication No. 81-12351)
This type of seal-breaking means attaches tear tape to the inner surface of the film along the entire tear line of the film that covers the packaged item, then exposes the tear tape end on the side where the tear starts, and then It is made by forming a cut in the film of the part.

The seal is broken by pulling the tear tape from the side where the cut is made. That is, when the tear tape is pulled, the film is torn from the notch formed on the tearing starting point side, and this tear is successively propagated along both sides of the tear tape and the seal is torn.

[Problems to be Solved by the Invention] However, the following problems remain with the conventional seal breaking means described above.

(1) With the tack label method of tearing, there is no guiding means after the tear begins, and the tear attempts to break into strips only by the natural propagation of the eye; There is a problem that the direction of the seal is unstable and the length to be broken is only about twice that of the tack label.For example, if the item to be packaged is a frozen pizza pie, if the required length to break is not obtained, If this cannot be removed and the film is forcibly torn, the topping is likely to fall off or the dough may be deformed.

In order to increase the breaking length, it is possible to use a film that has been sufficiently oriented and stretched in one direction, and to wrap the film so that this orientation direction and the breaking direction match, but in actual packaging, the orientation direction and It is extremely difficult to package products with the same direction of tearing. In addition, the film used is a heat-shrinkable film, and when shrink wrapping is performed with this film, the orientation of the film disappears during the heat-shrinking process, making it impossible to ensure the length of breakage due to the above-mentioned orientation. .

(2) With the tack tape method of breaking the seal, it is necessary to make narrow strip-like perforations throughout the area to be broken.
Since it takes time and effort to form these perforations, there is a problem in that packaging costs are high.

(3) In the tear tape type seal breaking means, since the tear tape is attached to the inner surface of the film, it is necessary to attach the tear tape to the film before covering the packaged item with the film. In particular, film packaging is carried out by heat-sealing the film, but if the tear tape is applied to the heat-sealed part, the strength of the tear tape will be significantly weakened during heat-sealing, and the tear tape will be damaged at that part when the package is broken. The tear tape may break and become impossible to tear.

The present invention has been made in view of the above-mentioned conventional problems.
The problem to be solved is to make it possible to obtain a sufficient breaking length by using a tape for breaking the seal provided on the outer surface of the film without using perforations as a means to guide the propagation of tears. That is.

[Means for Solving the Problems] The means taken in the present invention to solve the above problems will be explained with reference to FIGS. 1 and 2, which correspond to one embodiment of the present invention. In a shrink package using a plastic film 1, a tongue piece 3 is formed by a cut 2 at the breaking point of the film 1, and an adhesive tape 4 whose one end is located on the tip side of the tongue piece 3 is attached to the tongue piece 3. 3 is covered by a package with a tear-seal tape attached to the outer surface of the film 1 over the entire tear line.

[Function] The seal of the present package with the seal-breaking tape is broken by peeling off the adhesive tape 4 from the seal-breaking starting point side, that is, from the tongue piece 3 side.

At this time, due to the adhesive strength of the adhesive tape 4, the adhesive tape 4 is peeled off while the tongue piece 3 formed by the notch 2 remains stuck to the adhesive tape 4, and the notch 2 provided at the starting point of the seal is torn off. As a result, the film l is torn and the seal is broken.

In tearing and unsealing the film 1, the cut 2 serves to facilitate the start of tearing the film 1.
Furthermore, the fact that the adhesive tape 4 is pasted along the entire tearing line means that after the film l starts tearing, the tear will propagate while the adhesive tape 4 is still attached. The tear serves to prevent the direction of propagation of the grain from shifting and to allow the film l to be torn along the peeling direction of the adhesive tape 4.

[Example] In Figures 1 and 2, l stands for film.

It is heat-shrinked and tightly attached to the packaged object 5. Further, reference numeral 4 denotes an adhesive tape, which is attached to the outer surface of the film 1 over the entire tearing line.

As shown in FIG. 2, a 7-shaped notch 2 is provided at the point where the film 1 is to be broken, thereby forming a tongue piece 3. The adhesive tape 4 has one end located on the tip side of the tongue piece 3 and is pasted to cover the tongue piece 3.

One end of the adhesive tape 4 located on the tip end side of the tongue piece 3 is folded back to the adhesive surface side, and this portion constitutes a grip portion 6. This grip: WA6 is a place to grip with your fingers to pull the adhesive tape 4 when peeling it off and breaking the seal, and it is preferable to provide it because it facilitates the seal-breaking operation. It is preferable that the gripping part 6 has a shape that makes it easy to find the starting end of the adhesive tape 4 when breaking the seal, and also makes it easy to grasp with fingers.
For example, it may be formed by attaching another sheet piece to the adhesive tape 4 in the relevant portion, or it may be colored for easy identification.

The film 1 can be widely used as long as it is used in general shrink packaging, but it is not suitable for maintaining the strength required as a packaging material and the ability to easily tear the adhesive tape 4 by pulling it by hand. The tear strength is preferably 2 to 20 g.

The adhesive tape 4 is an ordinary pressure-sensitive adhesive tape, and has a tensile strength that can withstand the tensile force applied to tear the film 1 from the notch 2, and maintains the adhesion of the tongue piece 3 when tearing the film 1 from the notch 2. Any material having a pressure-sensitive adhesive strength that can be used may be used.

However, even when the adhesive tape 4 is suddenly peeled off, the pressure-sensitive adhesive force of the adhesive tape 4 to the film 1 must be There is no particular restriction on the upper limit of the tensile strength of the adhesive tape 4, which is preferably 10 times or more and 100 times or less than the tear strength of the film 1, but the pressure-sensitive adhesive strength is too strong. This makes it difficult to peel off the adhesive tape 4 from the film 1.

It is preferable to set it below the above-mentioned value.

In addition, in the present invention, the tear strength of the film 1 is A
The pressure-sensitive adhesive force of adhesive tape 4 is measured using STNO-1922.
It refers to the 180° peel strength when a rubber roller of 00g/c2 is made to reciprocate once and 50 layers/min.

In this embodiment, when the adhesive tape 4 is pulled by grasping the first grip 6, the adhesive tape 4 is peeled off from the film l, as shown in FIG. At this time, the tongue piece 3 formed by the cut 2 remains attached to the adhesive tape 4 and is pulled as the adhesive tape 4 is peeled off, whereby the film l is torn into thin strips starting from the cut 2. . Then, while keeping the width of this narrow strip portion constant, the tear propagates along the peeling direction of the adhesive tape 4, and the seal is broken along the entire tear line.

Further, the adhesive tape 4 itself may or may not have heat shrinkability.

FIG. 4 shows another embodiment of the notch 2 forming the tongue piece 3, in which (JL) is a U-shape, (b) is a U-shape, and (C
) is an X-shaped notch 2. In particular, the notches 2 at CC) form four tongues 3, so that the aforementioned gripping portion 6 (see Figures 1 to 3! @) can easily be placed on any tongue 3. It has the advantage of being able to initiate tearing.

Hereinafter, an experimental example regarding the tearing performance of the package with the present tearing tape will be shown.

Experimental Example 1 After extruding polyethylene into a crosslinked molten sheet, it was subjected to electron beam crosslinking, heated, and biaxially stretched (5 times in length and width).
A heat-shrinkable film was created.

Using the above heat-shrinkable film, a frozen pizza pie with a diameter of 150 mm was packaged in a pillow packaging shape.

A tight package in the shape of a pizza pie was made using hot air at 150°C.

The tensile strength of the film of the above package was determined by ASTM D-1.
As a result of measurement using the method of 922, it was 5 g.

An X-shaped cut is made in the film near the periphery of the package, and a 3M layer of acrylic adhesive is applied to the outer surface of the film so that one end covers this cut and almost crosses the top surface of the package. The coated adhesive tape was attached to a 130 mm polyester tube. The pressure-sensitive adhesive strength of this adhesive tape was measured by the method described above and was found to be 100 g.

Grasp the cut end of the adhesive tape above.

When I pulled the adhesive tape off, I found that it had a length of about 1 along the M line of the adhesive tape, starting from the notch.
The seal could be broken with an opening of 30s+m.

Comparative Experimental Example 1 Using the same packaging as in Experimental Example 1, I! was used to cover the X-shaped cut. A tack label of ＠IO layer and length of 30 cm was pasted.

As a result of grasping one end of the tack label and peeling it off, the length of the opening in the film was only about 50 mm.

Experimental Example 2 The seal was broken in the same manner as in Experimental Example 1, except that an adhesive tape with a pressure-sensitive adhesive force of 20 g was used.

When the adhesive tape was carefully and slowly peeled off, results similar to those in Experimental Example 1 were obtained; however, when the adhesive tape was peeled off slowly, about 2 C) ma from the incision was obtained when the adhesive tape was peeled off slowly.
No opening was obtained, and from then on, only the adhesive tape was peeled off without tearing the film.

[Effects of the Invention 1 The present research is as explained above, and has the following effects.

(1) When the seal is broken, the length necessary to take out the packaged item 5 can be reliably opened, making it easy to take out the packaged item 5 and preventing damage to the packaged item 5 during removal. (2) Since the fissure does not require a perforation to guide the eye,
Compared to the case where perforations are required, the effort and cost can be reduced.

(3) Since the adhesive tape 4 is attached to the outer surface of the film 1, the adhesive tape 4 can be provided after the film 1 necessary for packaging is heat-sealed, and the heat-sealed portion can be hung on the adhesive tape 4. The adhesive tape 4 is weakened by this, so that it does not break when the seal is torn and become impossible to break.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a package with a tearable tape according to the present invention, FIG. 2 is an enlarged perspective view of the vicinity of the breaking point,
Figure 3 is an explanatory diagram of the tearing state of the film, and Figure 4 (a
) to (c) are explanatory diagrams of other embodiments of the notches. 1: film, 2: vJ entry, 3: tongue piece, 4: adhesive tape, 5: packaged object, 6: gripping part.

Claims (2)

[Claims] (1) In a shrink package using a heat-shrinkable film, a tongue piece is formed by a cut at the breaking point of the film, and an adhesive tape with one end located on the tip side of the tongue piece holds the tongue piece. Throughout the covering and breaking line,
A package with a tear-off tape, characterized in that the tape is attached to the outer surface of a film. (2) The package with tear-off tape according to claim 1, characterized in that the pressure-sensitive adhesive force of the adhesive tape to the film is 10 times or more and 100 times or less the tear strength of the film.