JP5243393B2 - Packaging opening sheet - Google Patents

Description

  The present invention relates to a packaging opening sheet used when opening a plastic film for packaging a product.

Instant foods in containers (for example, so-called “cup noodles”) are packaged entirely with exterior films such as polypropylene shrink films and stretch films (so-called wrap films) so that the lid cannot be opened. ing.
Conventionally, an exterior film of instant food in a container has a notch or hole that becomes the opening start point, and one end in the length direction of the rectangular packaging opening sheet is formed on the exterior film so as to cover the notch or hole. It was bonded (see Patent Document 1). A person who cooks instant food in a container picks and pulls the other end in the length direction of the packaging opening sheet that is not adhered to the exterior film, tears the exterior film, opens it, then opens the lid and puts hot water into the container I cooked instant food by pouring on.
Further, in Patent Document 2, a knob is provided on the lid bonded to the upper end opening of the container body, and the whole is wrapped with an exterior film, and the knob is disposed outside the exterior film from a hole formed in the exterior film. In addition, it is described that a packaging opening sheet is adhered to a pick piece and an exterior film. In this packaging, the package-opening sheet was picked and pulled, the lid was peeled off from the container body, and the exterior film was broken to open it.

JP-A-11-292141 JP 2005-123393 A

However, when the packaging opening sheet described in Patent Document 1 is bonded to the exterior film, if the packaging opening sheet is pressed against the exterior film with a strong pressing force, the exterior film is torn from the notches and holes that are weak in strength. There was a case. On the other hand, when the packaging opening sheet is pressed against the exterior film with a weak pressing force, the adhesion becomes insufficient, and when the packaging opening sheet is pulled, the packaging opening sheet may be peeled off without breaking the exterior film. there were.
Moreover, in the packaging of patent document 2, it was difficult to let a knob piece pass through the hole formed in the exterior film, and its practicality was low.
Moreover, in the case of the exterior film of a container that is normally used, there are often restrictions on the positions at which cuts and holes can be formed. Furthermore, in some cases, notches and holes cannot be formed in the exterior film. Therefore, it is required to remove the cuts and holes that are the opening start points from the exterior film.
Accordingly, an object of the present invention is to provide a packaging opening sheet that can surely break the exterior film and is practical even without forming a cut or a hole serving as an opening start point in the exterior film. To do.

  The inventors of the present invention initially thought that the exterior film could be surely broken by using a package-opening sheet adhered to the exterior film with a strong adhesive force. However, as a result of experiments conducted by the present inventors, it has been found that the exterior film may not be broken only by increasing the adhesive strength. And as a result of further examining the packaging opening sheet to solve the above-mentioned problems, the following packaging opening sheet was invented.

[1] A packaging opening sheet that is adhered to an exterior film that packages an article and is pulled when the exterior film is opened,
A base material, a non-adhesive part disposed on at least a part of the peripheral edge of one side of the base material, and an adhesive part disposed on a part of the one side other than the non-adhesive part,
The substrate was measured in accordance with ISO 2493: 1992, with a test piece having a width of 38 mm and a length of 70 mm measured at a bending angle of 30 ° and a bending length of 1 mm, and the stiffness in the pulling direction at the time of opening was 0.002 mN · m or more. Yes,
The non-adhesive part is a part that cannot be adhered to the exterior film and / or a part that can be peeled after adhesion,
The adhesive part was measured in accordance with JIS Z 0237: 2000 by peeling 180 ° at a tensile rate of 0.3 m / min in an environment of 23 ° C. and having a 180 ° peel strength of 10 N / 25 mm or more with respect to the polyethylene terephthalate film. A sheet for opening a package, characterized by comprising
[2] The packaging opening sheet according to [1], wherein the adhesive portion has an adhesive layer containing a rubber-based hot melt adhesive.

  According to the packaging and unsealing sheet of the present invention, the exterior film can be surely broken without being formed with notches and holes as opening opening points in the exterior film, and is practical.

It is sectional drawing which shows one Embodiment of the sheet | seat for package opening of this invention. It is a top view which shows the non-adhesion part and adhesion part of the sheet | seat for package opening shown in FIG. It is a figure explaining an example of the usage method of the sheet | seat for packaging opening shown in FIG. It is a top view which shows the non-adhesion part and adhesion part in other embodiment of the sheet | seat for package opening of this invention. It is a top view which shows the non-adhesion part and adhesion part in other embodiment of the sheet | seat for package opening of this invention. It is a top view which shows the non-adhesion part and adhesion part in other embodiment of the sheet | seat for package opening of this invention. It is a top view which shows the non-adhesion part and adhesion part in other embodiment of the sheet | seat for package opening of this invention.

One embodiment of the packaging opening sheet of the present invention will be described.
1 and 2 show a package-opening sheet according to this embodiment. The packaging opening sheet 1 of this embodiment is adhered to an exterior film that wraps an article, and is pulled when the exterior film is opened, and is disposed on the periphery of the base 10 and the one surface 10a of the base 10. It has the non-adhesion part 11 and the adhesion part 12 other than the non-adhesion part 11 of the single side | surface 10a of the base material 10. FIG.
In the present embodiment, both the base material 10 and the adhesive portion 12 are rectangular, and the longitudinal direction of the adhesive portion 12 is the same as the longitudinal direction of the base material 10.
Moreover, the peeling sheet 20 is stuck to the surface 12b on the opposite side to the base material 10 of the adhesion part 12 so that peeling is possible.

[Base material]
The base material 10 has a stiffness in the direction of being pulled at the time of opening of 0.002 mN · m or more. Here, the stiffness is a value obtained by measuring a test piece having a width of 38 mm and a length of 70 mm under the conditions of a bending angle of 30 ° and a bending length of 1 mm in accordance with ISO 2493: 1992. If the stiffness of the substrate 10 is less than 0.002 mN · m, the exterior film may not be broken when the packaging opening sheet 1 is pulled, and the flexibility is too high to adhere to the exterior film. It tends to be difficult.
The stiffness in the direction along the opening direction of the substrate 10 is preferably 0.002 to 0.1 mN · m, more preferably 0.007 to 0.04 mN · m, and 0.008 to It is particularly preferably 0.037 mN · m. When the stiffness of the substrate 10 exceeds 0.1 mN · m, the flexibility is lowered, so that it becomes difficult to handle when opening, and may not be suitable as the packaging opening sheet 1.

Examples of the material of the base material 10 include resin, synthetic paper, and paper. Among these, a resin is preferable because the stiffness within the above range can be easily secured.
Examples of the resin constituting the substrate 10 include polyethylene, polypropylene, polyvinyl chloride, and polyethylene terephthalate. Among them, polypropylene and polyethylene terephthalate are preferable because the stiffness within the above range can be more easily ensured. As a polypropylene substrate and a polyethylene terephthalate substrate, a biaxially stretched polypropylene film or a biaxially stretched polyethylene terephthalate film can be used.
It is preferable that the surface 10b on the opposite side of the adhesive portion 12 of the substrate 10 is printable in order to display various characters, designs, barcodes, and the like. Examples of a method for enabling printing on the surface 10b opposite to the adhesive portion 12 of the substrate 10 include a method of performing a corona treatment and a method of providing a recording layer.

The width W _{a of the} substrate 10 is preferably 10 to 50 mm, and more preferably 12 to 30 mm. If the width W _a of the substrate 10 is 10mm or more, it is possible to sufficiently ensure the widths of the bonding portions 12, can break ensuring exterior film by pulling the packaging opening sheet 1. On the other hand, if the width W _a of the substrate 10 is 50mm or less, and improved handling of the package opening sheet 1 it becomes more practical.
Preferably the length _{L a} of the substrate 10 is 30 to 100 mm, and more preferably 50 to 80 mm. If the length L _a of the substrate 10 is 30mm or more, it is possible to sufficiently secure the length of the bonding portion 12, can break ensuring exterior film by pulling the packaging opening sheet 1, with less than 100mm If it exists, the handleability of the package opening sheet 1 will improve and it will become more practical.
The thickness of the substrate 10 is preferably 16 to 150 μm, more preferably 25 to 100 μm, and particularly preferably 40 to 60 μm. If the thickness of the substrate 10 is 16 μm or more, the stiffness can be easily made 0.002 mN · m or more, and if it is 150 μm or less, the stiffness can be easily made 0.1 mN · m or less.

[Non-adhesive part]
The non-bonding part 11 is a part that cannot be bonded to the exterior film and / or a part that can be peeled off after bonding. Specifically, the 180 ° peel strength with respect to the polyethylene terephthalate film is a portion of 0.01 N / 25 mm or less. In the present invention, the 180 ° peel strength with respect to the polyethylene terephthalate film is a peel strength measured by peeling 180 ° at a tensile rate of 0.3 m / min in an environment of 23 ° C. according to JIS Z 0237: 2000. Here, in the measurement of peel strength, the reason why the adherend was a polyethylene terephthalate film is that a polyethylene terephthalate shrink film is usually used as an exterior film for instant foods in containers.
If the 180 ° peel strength with respect to the polyethylene terephthalate film exceeds 0.01 N / 25 mm, the entire surface of the packaging opening sheet 1 adheres to the exterior film, and the packaging opening sheet 1 may not be picked.

In the present embodiment, the non-adhesive portion 11 has a grip portion 11 a for gripping the package opening sheet 1 on the end 10 c side in the longitudinal direction of the base material 10 from the adhesive portion 12. Further, the knob portion 11a is formed of the base material 10 only on the one end 10c side in the longitudinal direction of the base material 10 and is an unadherable portion 11b that cannot be adhered to the exterior film, and the adhesive portion 12 side is 180 relative to the polyethylene terephthalate film. ° peel strength 0.01 N / 25 mm or less of the adhesive layer 11c ₁ is a weakly joined portion 11c provided.
Distance _{L 1} between the length direction of the one end 10c and the adhesive portion 12 of the base 10 in the knob portion 11a, than the distance _{L 2} in the length direction of the other end 10d of the substrate 10 in the buffer portion 11d and the adhesive portion 12 The length is also made easy to pick.
Specifically, the length of the distance _{L 1} is preferably 10 to 20 mm. If the length of the distance L ₁ is 10mm or more, it is possible to pick the substrate 10 easily, if 20mm or less, can be opened casing films more easily.

The part other than the knob 11a of the non-adhesive part 11 is made of only the base material 10, and is a buffer part 11d that allows the adhesive of the adhesive part 12 to move and prevents the sticking part 11 from sticking out. .
In addition, the distances L ₃ and L ₄ between the end portions 10e and 10f in the width direction of the base material 10 and the bonding portion 12 in the buffer portion 11d are the distances between the other end 10d in the length direction of the base material 10 and the bonding portion 12. L ₂ and are substantially equal.

[Adhesive part]
The adhesive portion 12 is a portion that is provided with an adhesive layer 12a, adheres to the exterior film, and cannot be peeled after adhesion. Specifically, it is a portion having an adhesive strength of 180 ° peel strength to a polyethylene terephthalate film of 10 N / 25 mm or more, preferably 15 N / 25 mm or more, more preferably 20 N / 25 mm or more. When the 180 ° peel strength with respect to the polyethylene terephthalate film is less than 10 N / 25 mm, the packaging film may be peeled off when pulled, so that the packaging film may not be broken.

  Examples of the adhesive constituting the adhesive layer 12a of the adhesive portion 12 include a rubber-based hot melt adhesive, an ethylene-vinyl acetate-based hot melt adhesive, an acrylic adhesive, and a urethane adhesive. Among these, a rubber-based hot-melt adhesive is preferable because the peel strength can be easily obtained. The rubber-based hot melt adhesive is an adhesive containing a styrene-isoprene-styrene block copolymer (SIS) and a styrene-butadiene-styrene block copolymer (SBS) as an adhesive main component.

The adhesive layer 12a may contain a tackifier. Tackifiers include rosin, polymerized rosin, disproportionated rosin and its derivatives, polyterpenes, terpene phenols, phenol-modified resins such as rosin phenol, alkylphenol resins, coumarone-indene resins, xylene resins, aliphatic hydrocarbon resins, fats Examples thereof include cyclic saturated hydrocarbon resins, aromatic hydrocarbon resins and hydrogenated products thereof, styrenic resins, vinyltoluene-α-methylstyrene copolymers. These tackifiers may be used alone or in combination.
Among the tackifiers, those having a softening point of 150 ° C. or lower are preferable, and those having a temperature of 50 to 130 ° C. are more preferable. When the softening point exceeds 150 ° C., the adhesiveness during heating may decrease.

  The thickness of the adhesive layer 12a is preferably 50 to 300 μm, more preferably 50 to 200 μm, and particularly preferably 70 to 130 μm. If the thickness of the adhesive layer 12a is 50 μm or more, a sufficiently high adhesive force can be obtained, and if it is 300 μm or less, the adhesive layer 12a can be easily formed.

Width _{W b} of the adhesive portion 12 is preferably from 5 to 30 mm, and more preferably 5 to 15 mm. If the width W _b of the adhesive portion 12 is 5mm or more, it can break to ensure the exterior film by pulling the packaging opening for the seat 1, if 30mm or less, packaging opened even in weak elderly people and children of force By using the sheet 1, the exterior film can be broken.
Longitudinal length _{L b} of the adhesive portion 12 is preferably from 15～80Mm, and more preferably 20 to 60 mm. If the longitudinal length L _b of the adhesive portion 12 is 15mm or more, it can break ensuring exterior film by pulling the packaging opening sheet 1, as long as 80mm or less, less powerful elderly and children However, the exterior film can be broken by using the packaging opening sheet 1.

[Peeling sheet]
A known release sheet is used as the release sheet 20. For example, a release layer such as a silicone-based release agent is applied to the surface of cast coated paper, art paper, coated paper, high-quality paper, craft paper, glassine paper, etc., and a sealing layer is formed as necessary. A sheet is used.
The release sheet 20 may be a plastic film such as polyethylene terephthalate or polypropylene. A release agent may be applied to one side of the plastic film.

[how to use]
The said package opening sheet 1 is applied to the exterior film which packages an instant food with a container, for example.
That is, after the release sheet 20 is peeled off from the adhesive portion 12, the exposed adhesive portion 12 adheres the packaging opening sheet 1 to an arbitrary position of the exterior film 2a of the instant packaged food 2 as shown in FIG. Sell. A person who purchases and cooks the instant food 2 in a container picks the tab 11a of the unwrapping sheet 1 and pulls the unwrapping sheet 1 so as to open the outer film 2a before cooking. Thereby, since the part adhered to the adhesion part 12 of the packaging opening sheet 1 of the exterior film 2a is pulled, the exterior film 2a is torn and opened.
In the exterior film 2a, a hole having a perforation may be formed in the vicinity of the packaging opening sheet 1.

[Production method]
For example, the packaging unsealing sheet 1 is formed by applying an adhesive to a part of one side of the release sheet 20 and drying to form an adhesive layer 12a that becomes the adhesive portion 12, and on the exposed surface of the adhesive layer 12a. It is manufactured by laminating the base material 10. Alternatively, it is manufactured by applying an adhesive to a part of one surface of the base material 10 and drying it to form an adhesive layer 12a which is the adhesive portion 12, and laminating the release sheet 20 on the adhesive portion 12. .
When applying the adhesive, various coating apparatuses or printing apparatuses are used. When applying a hot melt adhesive, a coating apparatus or a printing apparatus equipped with a heating and heat retaining device is used. Examples of the coating apparatus include a roll coater such as a reverse roll coater and a gravure roll coater, a resin extrusion type die coater, a lip coater, and the like. As a printing apparatus, a gravure printing machine, a letterpress printing machine, a screen printing machine, etc. Is mentioned.
The base material 10 and the release sheet 20 may be a continuous body supplied from winding. However, when using a continuous body as the base material 10 and the release sheet 20, an adhesive is applied at a predetermined interval to form an adhesive layer.

[Function and effect]
Since the packaging opening sheet 1 can be bonded with a strong adhesive force by the bonding portion 12, it is difficult to peel off from the exterior film 2 a when the packaging opening sheet 1 is pulled. Further, the packaging opening sheet 1 has a high stiffness of 0.002 mN · m or more in the direction in which it is pulled, so that it is possible to disperse the force applied when opening the exterior film 2a without dispersing it. It can be used for pulling the film 2a. Therefore, even if an opening start point such as a cut or a hole is not formed in the exterior film 2a, the exterior film 2a can be reliably broken by pulling the packaging opening sheet 1.
As described above, according to the packaging opening sheet 1, it is not necessary to form cuts or holes in the exterior film 2 a, so that the exterior film 2 a can be broken when the packaging opening sheet 1 is bonded to the exterior film 2 a. Can be prevented. Moreover, since it becomes unnecessary to form a cut | notch and a hole in the exterior film 2a by using the sheet | seat 1 for packaging opening, it can affix on the arbitrary positions of the exterior film 2a.
Furthermore, the packaging unsealing sheet 1 is practical because it only needs to adhere to the exterior film 2a.

[Other Embodiments]
In addition, this invention is not limited to the said embodiment.
For example, in the knob portion 11a of the packaging opening sheet 1 of the above embodiment, as shown in FIG. 4, the weakly bonded portion may be omitted and only the unbondable portion 11b may be included. In addition, as shown in FIG. 5, the knob portion 11 a faces the adhesive portion 12 from one end 10 c in the length direction of the substrate 10 within a range where the 180 ° peel strength with respect to the polyethylene terephthalate film is 0.01 N / 25 mm or less. gradually the adhesive layer 11c ₁ that adhesion becomes higher may consist weakly joined portion 11c provided Te.
Moreover, as a form of the non-adhesion part 11 and the adhesion part 12, the buffer part 11d of the non-adhesion part 11 is abbreviate | omitted, and the one end 10c side of the one side of the base material 10 is made into the non-adhesion part 11 as shown in FIG. The other part may be in the form of the adhesive part 12.
In addition, as shown in FIG. 7, the bonding portion 12 may be disposed at the central portion of one side of the substrate 10, and the periphery thereof may be a non-bonding portion 11.
The shape of the base material 10 and the bonding portion 12 may be a shape other than a rectangular shape, for example, a circular shape, an elliptical shape, a triangular shape, a pentagonal shape, or the like.

  Further, the non-adhesive portion 11 can also be obtained by providing an adhesive layer 12a on the entire surface of one side of the substrate 10 and then applying a non-adhesion treatment to a predetermined portion of the exposed surface of the adhesive layer 12a. Examples of the non-adhesion process include a process of applying a non-adhesive resin, a process of attaching a non-adhesive film, and the like.

In the packaging opening sheet of the following example, the stiffness of the base material and the 180 ° peel strength of the adhesive part were measured by the following methods.
[Stiffness of substrate]
The stiffness of the base material used in each example and each comparative example was determined by using an ISO stiffness tester manufactured by L & W Co. according to ISO 2493: 1992. A test piece having a width of 38 mm and a length of 70 mm was bent at 30 ° and bent length was 1 mm. It measured on condition of this. In addition, the measurement was performed about both the flow direction (MD direction) at the time of manufacture of a base material, and the width direction (TD direction). The measurement results are shown in Table 1.
[180 ° peel strength of bonded part]
The adhesive part of the sheet for opening the package is adhered to a polyethylene terephthalate film (manufactured by Toyobo Co., Ltd.) and in accordance with JIS Z 0237: 2000, using a tensile tester (Tensilon RTC-1210A manufactured by A & D Corporation) at 23 ° C. The peel strength when peeled 180 ° at a tensile rate of 0.3 m / min was measured.

Example 1
A rubber-based hot melt adhesive on the substantially central portion of one side of a biaxially stretched polypropylene film (Torphan BO 60-2500 manufactured by Toray Industries, Inc.) having a length of 80 mm, a width of 20 mm, and a thickness of 50 μm, and the MD direction being the length direction. (No Tape Industrial Co., Ltd.) was coated with a hot melt coater. As a result, an adhesive layer (180 ° peel strength 20 N / 25 mm) was formed, an adhesive portion was provided, and a package opening sheet was obtained. At that time, as shown in FIG. 4, the peripheral edge of one side of the polypropylene film (base material 10) is a non-adhesive part 11 without an adhesive layer, and the non-adhesive part 11 is one end 10 c in the longitudinal direction of the base material 10. The side was used as the knob 11a, and the portion other than the knob 11a was used as the buffer 11d. Further, the distance _{L 1} in FIG. 4 and 15 mm, the distance _{L 2,} and the L 3, respectively 5mm and _{L 4.}

(Example 2)
In the same manner as in Example 1 except that a biaxially stretched polypropylene film (Torphan BO 50-2500 manufactured by Toray Industries, Inc.) was used instead of the biaxially stretched polypropylene film (Toray Industries BO 60-2500 manufactured by Toray Industries, Inc.) A sheet for opening the package was obtained.

(Example 3)
Except for using a biaxially stretched polypropylene film (Toray Industries BO 40-2500 manufactured by Toray Industries, Inc.) instead of the biaxially stretched polypropylene film (Toray Industries BO 60-2500 manufactured by Toray Industries, Inc.), A sheet for opening the package was obtained.

Example 4
Instead of a biaxially stretched polypropylene film (Toray Industries, Inc., TOREBO BO 60-2500), a biaxially stretched polypropylene film (Toray Industries, Inc., Trefan BO 30-2500) was used in the same manner as in Example 1, A sheet for opening the package was obtained.

(Example 5)
In the same manner as in Example 1 except that a biaxially stretched polypropylene film (Torphan BO 25-2500 manufactured by Toray Industries, Inc.) was used instead of the biaxially stretched polypropylene film (Toray Industries BO 60-2500 manufactured by Toray Industries, Inc.) A sheet for opening the package was obtained.

(Example 6)
For unpacking in the same manner as in Example 1 except that a biaxially stretched polyethylene terephthalate film (Lumirror T11S50 manufactured by Toray Industries, Inc.) was used instead of a biaxially stretched polypropylene film (Toray Industries BO 60-2500 manufactured by Toray Industries, Inc.) A sheet was obtained.

(Example 7)
For unpacking in the same manner as in Example 1 except that a biaxially stretched polyethylene terephthalate film (Lumirror TL25 manufactured by Toray Industries, Inc.) was used instead of the biaxially stretched polypropylene film (Toray Industries BO 60-2500 manufactured by Toray Industries, Inc.) A sheet was obtained.

(Comparative Example 1)
Instead of a biaxially stretched polypropylene film (Toray Industries, Inc., TOREBO BO 60-2500), a biaxially stretched polypropylene film (Toray Industries, Inc., TORAYPHAN BO 20-2500) was used in the same manner as in Example 1, A sheet for opening the package was obtained.

[Evaluation]
The openability of the exterior film when using the packaging and unsealing sheets of the above Examples and Comparative Examples was evaluated as follows.
That is, first, the packaging opening sheets were bonded to the following exterior films A to E, respectively. Next, the picking portion of the package opening sheet was picked and pulled so as to roll the package opening sheet. At that time, the state of opening the exterior film was visually observed and evaluated. The evaluation results are shown in Table 1. In Table 1, “◯” indicates that the exterior film could be opened, and “x” indicates that the opening film could not be opened.
Exterior film A: Exterior film (polypropylene film) of trade name cup noodle (manufactured by Nissin Foods Co., Ltd.)
Exterior film B: Exterior film (polyethylene terephthalate film) of trade name Super Cup (Acecock Co., Ltd.)
Exterior film C: Product name Meisei Yakisoba (Myosei Foods Co., Ltd.) exterior film (polyethylene terephthalate film)
Exterior film D: Exterior film (polyethylene terephthalate film) under the trade name Maruchan Tempura Soba (manufactured by Toyo Suisan Co., Ltd.)
Exterior film E: Exterior film (polyethylene terephthalate film) of trade name Katokichi ramen (manufactured by Katoyoshi Co., Ltd.)

According to the packaging-opening sheets of Examples 1 to 7 having a substrate stiffness of 0.002 mN · m or more and a 180 ° peel strength of 5 N / 25 mm or more, the exterior film could be reliably broken.
The packaging film of Comparative Example 1 in which the stiffness of the substrate was less than 0.002 mN · m did not break the exterior film.

  The packaging and unsealing sheet of the present invention is adhered to an exterior film that wraps, for example, an instant food in a container, a case for housing an optical disk, and the like. Moreover, it is used for the package body which the sheet | seat for package opening was stuck.

DESCRIPTION OF SYMBOLS 1 Sheet | seat for package opening 10 Base material 11 Non-adhesion part 11a Knob part 11b Non-adhesion part 11c Weak adhesion part 11d Buffer part 12 Adhesion part 12a Adhesive layer 20 Release sheet

Claims (2)

A packaging opening sheet that is adhered to an exterior film that wraps an article and is pulled when the exterior film is opened,
A base material, a non-adhesive part disposed on at least a part of the peripheral edge of one side of the base material, and an adhesive part disposed on a part of the one side other than the non-adhesive part,
The substrate was measured in accordance with ISO 2493: 1992, with a test piece having a width of 38 mm and a length of 70 mm measured at a bending angle of 30 ° and a bending length of 1 mm, and the stiffness in the pulling direction at the time of opening was 0.002 mN · m or more. Yes,
The non-adhesive part is a part that cannot be adhered to the exterior film and / or a part that can be peeled after adhesion,
The adhesive part was measured in accordance with JIS Z 0237: 2000 by peeling 180 ° at a tensile rate of 0.3 m / min in an environment of 23 ° C. and having a 180 ° peel strength of 10 N / 25 mm or more with respect to the polyethylene terephthalate film. A sheet for opening a package, characterized by comprising   The packaging opening sheet according to claim 1, wherein the adhesive portion has an adhesive layer containing a rubber-based hot melt adhesive.

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