JP7460213B2 - envelope - Google Patents

Description

The present invention relates to envelopes used to store catalogs, pamphlets, photographs, and various documents.

When opening direct mail or pamphlets that are sent in a paper envelope, it is easy and clean to open them using scissors or a cutter, but if there are no scissors or a cutter nearby, people often open the sealed part with their fingers or forcefully pull and tear part of the envelope.

However, if you try to tear a paper envelope using only your fingers, a large part of it may tear apart from the part you intended to tear, compromising the envelope's functionality and appearance, and damaging the contents (the envelope's contents).

In light of this, envelopes have been proposed that are designed to be easily opened without using a blade such as scissors or a cutter. Examples of envelopes related to the present invention include the "envelope" described in Patent Document 1, the "envelope with an opening section" described in Patent Document 2, and the "envelope" described in Patent Document 3.

The envelopes described in Patent Documents 1 to 3 are provided with two rows of perforations along the longitudinal direction of the opening in the flap for sealing the opening of the envelope body, so that the flap between the two rows of perforations is A band-shaped cut-off piece is formed on the flap, and if you pinch one end of the cut-off piece in the longitudinal direction with your fingers and pull it toward the other end of the cut-off piece, the flap will break along the perforation. Therefore, the package can be opened without using sharp tools such as scissors or a cutter.

Registered utility model No. 3004873 Japanese Patent Application Publication No. 9-66942 Japanese Patent Application Publication No. 2011-68394

As mentioned above, the envelopes described in Patent Documents 1 to 3 have a flap for sealing the opening of the envelope body that has a cut-off piece sandwiched between two rows of perforations, so they can be opened without using a blade such as scissors or a cutter. However, opening the envelope in this way is surprisingly difficult and often leads to failure.

Specifically, when one end of the flap in the longitudinal direction of a sealed envelope is pinched with the fingers and pulled toward the other end, the flap will initially break along the perforation, but just before or after the break reaches the longitudinal center of the flap, it will come off the perforation, causing the cut piece to tear off midway, or the break will spread to areas other than the cut piece, damaging the envelope itself.

The problem that this invention aims to solve is to provide an envelope that can be easily opened without using a blade such as scissors or a cutter, and that does not damage the envelope body or contents when opened.

The envelope of the present invention comprises a bag-shaped envelope body, a flap extending from the upper edge of a surface member of the envelope body for sealing an opening of the envelope body, an adhesive tape with a release paper attached to a portion of the back surface of the flap near the upper edge, a large perforation arranged in a straight line parallel to the longitudinal direction of the flap on the portion of the flap near the adhesive tape, and a small perforation arranged in the flap near the upper edge of the envelope body in a bent shape so as to approach the large perforation as it approaches the longitudinal center of the flap .

The force required to tear the small perforation is greater than the force required to tear the large perforation.

The cut-out piece is provided with a constricted portion in a central portion in the longitudinal direction of the flap, where the distance between the large perforation and the small perforation is the narrowest.

By pinching one edge of the cut piece and pulling it toward the other edge, the flap is broken along the small perforation and the large perforation, and the central part of the cut piece is broken. To provide an envelope which can be opened by continuously separating only the cut piece from the flap without the torn part coming off from the large perforation and the small perforation even in the front and back.

The present invention provides an envelope that can be opened easily and smoothly without using a blade such as scissors or a cutter, and that does not damage the envelope body or contents when opened.

1 is a partially omitted front view showing an envelope according to an embodiment of the present invention in a state before being sealed. FIG. 2 is a partially omitted rear view showing the envelope shown in FIG. 1 in an unsealed state. FIG. 3 is a rear view of the envelope shown in FIG. 2 after it has been sealed, with some parts omitted. FIG. 4 is a partially omitted rear view showing a state in which the envelope shown in FIG. 3 is being opened. FIG. 7 is a partially omitted rear view showing an unsealed state of an envelope according to another embodiment. 6 is a partially omitted rear view showing the envelope shown in FIG. 5 in a sealed state; FIG. FIG. 11 is a rear view of an envelope according to another embodiment, with some parts omitted, showing the envelope in a pre-sealed state. 8 is a partially omitted rear view showing a state of the envelope shown in FIG. 7 after being sealed; FIG. FIG. 11 is a rear view of an envelope according to another embodiment, with some parts omitted, showing the envelope in a pre-sealed state. FIG. 10 is a rear view of the envelope shown in FIG. 9 after it has been sealed, with some parts omitted. FIG. 7 is a partially omitted rear view showing a state before sealing of an envelope according to another embodiment. 12 is a partially omitted rear view showing the envelope shown in FIG. 11 in a sealed state; FIG. FIG. 11 is a rear view of an envelope according to another embodiment, with some parts omitted, showing the envelope in a pre-sealed state. FIG. 14 is a rear view, with some parts omitted, showing the envelope shown in FIG. 13 in a sealed state. FIG. 11 is a rear view of an envelope according to another embodiment, with some parts omitted, showing the state after the envelope is sealed. FIG. 7 is a partially omitted rear view showing a state before sealing of an envelope according to another embodiment. FIG. 17 is a rear view, with some parts omitted, showing the envelope shown in FIG. 16 in a sealed state.

Below, envelopes 10, 20, 30, 40, 50, 60, 70, and 80 will be described with reference to Figures 1 to 17. Note that, among the components of envelopes 20, 30, 40, 50, 60, 70, and 80 shown in Figures 5 to 17, those components common to those of envelope 10 shown in Figures 1 to 4 will be given the same reference numerals as those shown in Figures 1 to 4, and descriptions thereof may be omitted.

First, the envelope 10 will be explained based on FIGS. 1 to 4. As shown in FIGS. 1 and 2, the envelope 10 includes a bag-shaped envelope body 1 and an upper edge 3a of the surface member 3 of the envelope body 1 to seal the opening 2 of the envelope body 1. It includes a flap 4 and a strip-shaped cutout piece 7 formed between the plurality of perforations 5 and 6 by providing a plurality of perforations 5 and 6 in the flap 4 along the longitudinal direction L of the flap 4. , a part of the cutout piece 7 has a constricted part 7a in which the distance D between the plurality of perforations 5 and 6 is continuously narrowed.

An adhesive tape 8 with a release paper is attached to a portion of the back surface of the flap 4 near the upper edge 4a along the longitudinal direction L of the flap 4. The upper edge portion 4a is also called a crease, and is a portion that becomes a crease when the flap 4 is folded to seal the opening 2 of the envelope body 1.

As shown in FIG. 2, the perforations 5 and 6 are provided in the flap 4 in the portion between the upper edge 3a of the surface member 3 of the envelope body 1 and the adhesive tape 8. The longitudinal shape of the perforation 5 located closer to the adhesive tape 8 is linear and parallel to the longitudinal direction L of the flap 4. The perforation 6 located closer to the upper edge 3a has a shape in which the central portion in the longitudinal direction L protrudes toward the perforation 5. As a result, a constricted portion 7a where the distance D between the perforations 5 and 6 is narrowest is formed in the central portion of the longitudinal direction L of the cut-out piece 7.

The envelope 10 is used in the same way as a conventional envelope. After inserting the contents (not shown) into the envelope body 1 through the opening 2 of the envelope 10 before sealing as shown in FIG. (not shown) to expose the adhesive surface, bend the flap 4 180 degrees with the upper edge 3a as a crease, and attach the flap 4 to the back member 9 of the envelope body 1 via the adhesive tape 8. As shown in FIG. 3, the envelope 10 is in a sealed state.

When opening the sealed envelope 10, as shown in FIG. 4, while visually viewing the back member 9 of the envelope body 1, one edge 7b of the cut piece 7 is slightly bent and pinched with the fingers, and then pulled toward the other edge 7c. The flap 4 breaks along the perforations 5 and 6, and even if the broken portion approaches the center of the longitudinal direction L of the flap 4, the broken portion does not come off the perforations 5 and 6, and only the cut piece 7 is continuously cut off from the flap 4, so that the envelope can be opened easily and smoothly without using a blade such as scissors or a cutter. The shape and size of the perforations 5 and 6 are not limited, and can be set arbitrarily (for example, the width of the perforations can be set to about 5 mm or about 3 mm) according to the size, paper quality, and paper thickness of the envelope 10.

As shown in Figure 4, when edge 7b of cut piece 7 is pinched with fingers and pulled to separate it from flap 4, the broken portion does not come off perforations 5, 6, so there is no damage to envelope body 1 or contents when opening. Note that Figure 4 shows edge 7b of cut piece 7 being pinched with fingers and pulled toward edge 7c, but this is not limited to this, so edge 7c of cut piece 7 can also be pinched with fingers and pulled toward edge 7c to open it depending on the dominant hand, etc.

In the envelope 10 shown in FIGS. 1 to 4, the flap 4 is provided with a plurality of perforations 5 and 6, but the invention is not limited to this. It is also possible to provide a portion, such as a break line, which has a weak tensile strength and where breakage starts (proceeds) preferentially when a tensile force is applied to the end edges 7b, 7c of the cut piece 7.

Next, the envelope 20 will be explained based on FIGS. 5 and 6. As shown in FIGS. 5 and 6, in the envelope 20, a plurality of perforations 25 and 26 are provided in the flap 4 between the upper edge 3a of the surface member 3 of the envelope body 1 and the adhesive tape 8. A cutout piece 27 is formed by this. Each of the plurality of perforations 25 and 26 has a shape that is bent toward each other as it approaches the center portion in the longitudinal direction L of the flap 4, and the distance D between the perforations 25 and 26 is the narrowest constriction. A portion 27a is formed at the center portion of the cutout piece 7 in the longitudinal direction L of the flap 4.

The method of sealing the envelope 20 is the same as that of the envelope 10 shown in FIGS. 1 to 4, and the operation of opening the envelope 20 can also be performed in the same procedure as shown in FIG. That is, when the vicinity of one end edge 27b (or 27c) of the cutout piece 27 is pinched with fingers and pulled toward the other end edge 27c (or 27b), the flap 4 breaks along the perforations 25, 26. Then, only the cut piece 27 is continuously cut off from the flap 4 without the broken part coming off from the perforations 25 and 26 at the front and back of the central part, so it is not necessary to use a cutting tool such as scissors or a cutter. The envelope can be opened easily and smoothly without damaging the envelope body 1 or the contents when opening.

Next, the envelope 30 will be explained based on FIGS. 7 and 8. As shown in FIGS. 7 and 8, in the envelope 30, a large perforation 35 is provided on the flap 4 near the adhesive tape 8, and the upper edge 3a of the surface member 3 of the envelope body 1 (see FIG. 5) The cut-off piece 37 is formed by providing a small perforation in a portion corresponding to . Both the large perforation 35 and the small perforation 36 are bent so as to approach each other as they approach the center portion of the flap 4 in the longitudinal direction L, and the distance between the large perforation 35 and the small perforation 36 is A constricted portion 37a where D is the narrowest is formed in the center portion of the cutout piece 37 in the longitudinal direction L of the flap 4.

The force required to tear along the large perforation 35 and the small perforation 36 differs, and the force required to tear the small perforation 36 is greater than the force required to tear the large perforation 35. Therefore, as shown in FIG. 8, the small perforation 36 located at the folded portion of the upper edge of the sealed envelope 30 (corresponding to the upper edge 3a of the surface member 3) can be prevented from being easily torn during transport, etc.

The method of sealing the envelope 30 is the same as that of the envelope 10 shown in FIGS. 1 to 4, and the operation of opening the envelope 30 is also the same as the procedure shown in FIG. That is, when the vicinity of one end edge 37b (or 37c) of the cutout piece 37 is pinched with fingers and pulled toward the other end edge 37c (or 37b), the flap 4 breaks along the perforations 35, 36. Then, only the cut piece 37 is continuously cut off from the flap 4 without the broken part coming off from the perforations 35 and 36 at the front and back of the central part, so it is not necessary to use a cutting tool such as scissors or a cutter. The envelope can be easily opened without causing any damage to the envelope body 1 or the contents when opening.

Next, the envelope 40 will be described with reference to Figures 9 and 10. As shown in Figures 9 and 10, in the envelope 40, a large perforation 45 is provided in the portion of the flap 4 close to the adhesive tape 8, and a small perforation 46 is provided in the portion of the surface member 3 of the envelope body 1 close to the upper edge 3a, thereby forming a cut-out piece 47. The large perforation 45 is a straight line parallel to the longitudinal direction L of the flap 4, and the small perforation 46 is bent so as to approach the large perforation 45 as it approaches the center of the longitudinal direction L of the flap 4.

Also in the envelope 40, a constricted portion 47a where the distance D between the large perforation 45 and the small perforation 46 is the narrowest is formed in the central portion of the cutout piece 47 in the longitudinal direction L of the flap 4. Further, as in the case of the envelope 30 shown in FIG. 7, the force required to tear the small perforations 46 is greater than the force required to tear the large perforations 45.

The method of sealing the envelope 40 is the same as that of the envelope 10 shown in Figures 1 to 4, and the procedure for opening the envelope 40 is the same as that shown in Figure 4. That is, when the cut piece 47 is pinched near one edge 47b (or 47c) with the fingers and pulled toward the other edge 47c (or 47b), the flap 4 breaks along the perforations 45, 46, and the cut piece 47 is continuously cut away from the flap 4 without coming off the perforations 45, 46 even before and after the center of the cut piece 47, so that the envelope can be opened easily and smoothly without using a blade such as scissors or a cutter, and no damage is done to the envelope body 1 or the contents when opening.

Next, the envelope 50 will be described with reference to Figures 11 and 12. As shown in Figures 11 and 12, in the envelope 50, a large perforation 55 is provided in the portion of the flap 4 close to the adhesive tape 8, and a small perforation 56 is provided in the portion close to the upper edge 3a of the surface member 3 of the envelope body 1, thereby forming a cut-out piece 57. The large perforation 55 is a straight line parallel to the longitudinal direction L of the flap 4, and the small perforation 56 is bent so as to approach the large perforation 55 as it approaches the portion between the center portion of the longitudinal direction L of the flap 4 and the end edge 57b.

In the envelope 50, the constricted part 57a where the distance D between the large perforation 55 and the small perforation 56 is the narrowest is the narrowest part 57a between the central part of the cutout piece 57 in the longitudinal direction L of the flap 4 and the edge part 57b. formed into parts. Further, as in the case of the envelope 30 shown in FIG. 7, the force required to tear the small perforation 56 is set to be greater than the force required to tear the large perforation 55.

The method of sealing the envelope 50 is the same as that of the envelope 10 shown in Figures 1 to 4, and the procedure for opening the envelope 50 is the same as that shown in Figure 4. That is, when the vicinity of one edge 57b of the cut-off piece 57 is pinched with the fingers and pulled toward the other edge 57c, the flap 4 breaks along the perforations 55, 56, and the cut-off piece 57 alone is continuously cut away from the flap 4 without coming off the perforations 55, 56 even before and after the center of the cut-off piece 57, so that the envelope can be easily opened without using a blade such as scissors or a cutter, and no damage is done to the envelope body 1 or the contents when opening.

In the envelope 50, the narrowest narrowed portion 57a, where the distance D between the major perforation 55 and the minor perforation 56 is the narrowest, is formed in the portion between the center of the longitudinal direction L of the flap 4 in the cut-out piece 57 and the edge 57b (the portion closer to the edge 57b). However, this is not limited to this, and the narrowed portion 57a can also be formed in the portion between the center of the longitudinal direction L of the flap 4 in the cut-out piece 57 and the edge 57c (the portion closer to the edge 57c) depending on the user's dominant hand, etc.

Next, the envelope 60 will be described with reference to Figures 13 and 14. As shown in Figures 13 and 14, in the envelope 60, a large perforation 65 is provided in the portion of the flap 4 near the adhesive tape 8, and a small perforation 66 is provided in the portion corresponding to the upper edge 3a (see Figure 5) of the surface member 3 of the envelope body 1, thereby forming a cut-out piece 67. The small perforation 66 is a straight line parallel to the longitudinal direction L of the flap 4, and the large perforation 65 is bent so as to come closest to the small perforation 66 in the portion between the center portion of the longitudinal direction L of the flap 4 and the end edge 67b.

As a result, a constricted portion 67a where the distance D between the large perforation 65 and the small perforation 66 is narrowest is formed in the portion of the cut-out piece 67 between the center portion of the flap 4 in the longitudinal direction L and the end edge portion 67b. The force required to tear the large perforation 65 and the small perforation 66 along the perforation differs, and the force required to tear the small perforation 66 is greater than the force required to tear the large perforation 65. Therefore, it is possible to prevent the small perforation 66 located in the folded portion of the upper edge of the envelope 60 in a sealed state (the portion corresponding to the upper edge 3a of the surface member 3) from easily breaking during transport, etc., as shown in FIG. 14.

The method of sealing the envelope 60 is the same as that of the envelope 10 shown in Figures 1 to 4, and the procedure for opening the envelope 60 is the same as that shown in Figure 4. That is, when the cut piece 67 is pinched near one edge 67b with the fingers and pulled toward the other edge 67c, the flap 4 breaks along the perforations 65, 66, and the cut piece 67 is continuously cut away from the flap 4 without the broken portion coming off the perforations 65, 66 even before and after the center of the cut piece 67, so that the envelope can be easily opened without using a blade such as scissors or a cutter, and no damage is done to the envelope body 1 or the contents when opening.

In the envelope 60, the constricted part 67a where the distance D between the large perforation 65 and the small perforation 66 is the narrowest is the narrowest part 67a between the center part of the cutout piece 67 in the longitudinal direction L of the flap 4 and the edge part 67b. Although it is not limited to this, depending on the convenience of your dominant hand, the constricted portion 67a is formed at the center portion of the cutout piece 67 in the longitudinal direction L of the flap 4 and the end edge. It can also be formed in a portion between the portion 67c (a portion closer to the end edge portion 67c).

Next, the envelope 70 will be described with reference to Figure 15. As shown in Figure 15, in the envelope 70, a large perforation 75 is provided in the portion of the flap 4 near the adhesive tape 8, and a medium perforation 76 and small perforations 76a, 76b are provided in the portion corresponding to the upper edge 3a (see Figure 5) of the surface member 3 of the envelope body 1, forming a cut-out piece 77.

The small perforations 76a and 76b are formed at both ends of the medium perforation 76 in the length direction (portions near the end edges 77b and 77c). The large perforation 75 is a straight line parallel to the longitudinal direction L of the flap 4, and the overall shape of the medium perforation 76 and small perforations 76a, 76b is such that the large perforation 75 is formed at the center of the longitudinal direction L of the flap 4. It has a bent shape so that it is closest to each other.

As a result, a constricted portion 77a in which the distance D between the large perforation 75, the medium perforation 76, and the small perforations 76a and 76b is the narrowest is formed in the central portion of the cutout piece 77 in the longitudinal direction L of the flap 4. ing. The large perforation 75, the medium perforation 76, and the small perforations 76a and 76b are different in the amount of force required to tear (break) along the perforation, and tear along the medium perforation 76. Sometimes the force required is greater than the force required when tearing along the large perforation 75, and the force required when tearing along the small perforations 76a, 76b is greater than the force required when tearing along the medium perforation 76. is greater than the force required for

In addition, in the envelope 70, a notch 71 is formed in the longitudinal edge 77c of the cut-out piece 77, forming a concave shape (semicircular shape) toward the inside of the flap 4. When opening the envelope 70, the gap that occurs near the notch 71 can be used to insert fingers into the gap between the edge 77c of the cut-out piece 77 and the back member 9 of the envelope body 1, making the opening operation easier. The position of the notch 71 is not limited, so it can be formed on the edge 77b of the cut-out piece 77, or on both edges 77b, 77c.

Also, as shown in FIG. 15, the edge 77b of the cut-out piece 77 may have notches 72, 73 that are concave (wedge-shaped) toward the inside of the flap 4. A portion of the notch 72 is continuous with the longitudinal end of the small perforation 76a, and a portion of the notch 73 is continuous with the longitudinal end of the large perforation 75. When opening the envelope 70, the gaps near the notches 72, 73 can be used to insert fingers into the gap between the edge 77b of the cut-out piece 77 and the back member 9 of the envelope body 1 to slightly bend the corner of the notch 72, thereby easily pinching and pulling the edge 77b of the cut-out piece 77, thereby making the opening process even easier.

Since the positions of the notches 72 and 73 are not limited, not only can the notches 72 and 73 be formed on the end edge 77c of the cutout piece 77, but also on both end edges 77b and 77c. . Moreover, either one of the notches 72 and 73 may be provided only on one of the edge portions 77b and 77c of the cutout piece 77, or may be provided on both edge portions 77b and 77c.

The operation of opening the envelope 70 is the same as the procedure for opening the envelope 10 shown in FIG. 4. Insert your fingers near the notches 72 and 73 (or near the notch 71 of the edge 77c) of one end edge 77b of the cut-off piece 77, slightly bend the corner of the notch 72, and pinch the edge 77b (or edge 77c) and pull it toward the other end edge 77c (or edge 77b). The flap 4 breaks along the large perforation 75, the small perforation 76a, the medium perforation 76, and the small perforation 76b. Even in the middle of the cut-off piece 77, the broken part does not come off the perforations 75 and 76, and only the cut-off piece 77 is continuously cut off from the flap 4. This allows the envelope 70 to be opened easily and smoothly without using a blade such as scissors or a cutter, and does not damage the envelope body 1 or the contents when opening.

In the envelope 70, by providing notches 72 and 73 on the edge 77b of the tear-off piece 77 and providing a notch 71 on the edge 77c, work efficiency at the start of the opening process is improved. can be achieved.

Next, the envelope 80 will be described with reference to Figures 16 and 17. As shown in Figures 16 and 17, in the envelope 80, a cut-out piece 87 is formed by providing a number of perforations 85, 86 along the longitudinal direction L of the flap 4 in the area between the adhesive tape 8 and the upper edge 3a of the surface member 3 of the envelope body 1.

The perforation 85 is a straight line parallel to the longitudinal direction L of the flap 4, and the perforation 86 is a curved line (arc-shaped) that comes closest to the perforation 85 at the center of the longitudinal direction L of the flap 4. As a result, a constricted portion 87a is formed at the center of the longitudinal direction L of the flap 4 in the cut-out piece 87, where the distance D between the perforations 85 and 86 is the narrowest.

The method of sealing the envelope 80 is the same as that of the envelope 10 shown in FIGS. 1 to 4, and the operation of opening the envelope 80 is also the same as the procedure shown in FIG. That is, when the vicinity of one end edge 87b (or the vicinity of the end edge 87c) of the cut-off piece 87 is pinched with fingers and pulled toward the other end edge 87c (or end edge 87b), the perforations 85, 86 are removed. The flap 4 is torn along the , and even in the middle of the cutout piece 67 , the broken part does not come off from the perforations 85 and 86 , and only the cutout piece 87 is continuously cut off from the flap 4 . The envelope can be opened easily and smoothly without using a cutter such as a knife or a cutter, and the envelope body 1 and the contents are not damaged during opening.

The material for forming the envelopes 10, 20, 30, 40, 50, 60, 70, 80 described above is preferably, for example, paper, but is not limited to this. It can be formed using a natural material or a synthetic resin material.

Note that envelopes 10, 20, 30, 40, 50, 60, 70, and 80 described with reference to Figures 1 to 17 are examples of envelopes according to the present invention, and envelopes according to the present invention are not limited to the envelopes 10, 20, 30, 40, 50, 60, 70, and 80 described above.

The envelope according to the present invention can be widely used in the distribution industry, where direct mail, postal items, and other deliveries are handled, as a material for storing catalogs, pamphlets, and various documents.

REFERENCE SIGNS LIST 1 envelope body 2 opening 3 surface member 3a, 4a upper edge 4 flap 5, 6, 25, 26, 85, 86 perforation 7, 27, 37, 47, 57, 67, 77, 87 cut-off piece 7a, 27a, 37a, 47a, 57a, 67a, 77a, 87a constriction 7b, 7c, 27b, 27c, 37b, 37c, 47b, 47c, 57b, 57c, 67b, 67c, 77b, 77c, 87b, 87c cut-off piece 8 adhesive tape 9 back member 10, 20, 30, 40, 50, 60, 70, 80 envelope 35, 45, 55, 65, 75 large perforation 76 medium perforation 36, 46, 56, 66, 76a, 76b Small perforations 71, 72, 73 Notch D Distance L Longitudinal direction

Claims (1)

A bag-shaped envelope body;
a flap extending from an upper edge of a surface member of the envelope body for sealing an opening of the envelope body;
an adhesive tape with release paper attached to a portion of the back surface of the flap near the upper edge;
a cut-out piece formed on the flap by a large perforation provided in a straight line parallel to the longitudinal direction of the flap in a portion of the flap close to the adhesive tape, and a small perforation provided in the flap close to the upper edge of the envelope body, the small perforation being bent so as to approach the large perforation as it approaches the central portion of the flap in the longitudinal direction ;
The force required to tear the small perforation is greater than the force required to tear the large perforation;
The cut-off piece is provided with a constricted portion at a central portion in a longitudinal direction of the flap, where a distance between the large perforation and the small perforation is narrowest ;
The envelope can be opened by pinching one edge of the cut piece and pulling it toward the other edge, thereby breaking the flap along the small and large perforations, and continuously cutting only the cut piece from the flap without the broken portion coming off the large and small perforations even before and after the center part of the cut piece .

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