JP2549366Y2 - Expandable envelope - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deployable envelope, and more particularly to a deployable envelope which can be easily opened.

[0002]

2. Description of the Related Art The general form of mail for communication is roughly classified into postcards and postal letters, which are used depending on the application. Among these, the sealed letter is preferable in that personal letters and the like are mailed in a sealed form in an envelope, so that security can be provided in terms of confidentiality of information and that various enclosed items can be mailed together. In comparison with a postcard, the operation of enclosing a letter or the like in an envelope or gluing is required, and the opening of the recipient side requires much labor. Furthermore, the envelope itself is only used as a means for enclosing letters and does not contribute to the transmission of information.

For this reason, for example, a so-called simple envelope has been put to practical use. However, this is because the upper and lower sides and side edges of a folded sheet are glued to form an envelope. It is not particularly simple. On the other hand, for postcards, postcards with seals using so-called pseudo-adhesion have been used in recent years, but there are certain restrictions on the shape and weight, and there is a unique restriction that postcards in particular cannot be enclosed. .

[0004] Therefore, with the increase in the amount of information transmitted by mail and the diversification of forms, it is desired to improve and develop mails in the form of sealed letters that are easier to handle and that can be enclosed. ing.

[0005]

SUMMARY OF THE INVENTION An object of the prior art is to provide an envelope body comprising a pair of sheets which are joined along a central fold line and are folded so as to be expandable with their inner surfaces facing each other. And a film laminate obtained by bonding two transparent thermoplastic resin films having the same shape to each other in a releasable manner, and one of the films of the film laminate is provided along a peripheral frame portion. The other film is fixed to the inner surface of one sheet of the envelope body through a pressure-sensitive adhesive layer and the other film is fixed to the inner surface of the other sheet of the envelope body through a transparent pressure-sensitive adhesive layer over the entire surface. Forming a bag-like storage space therebetween by fixing the one sheet to the one film by a frame-shaped portion, and forming an opening communicating with the storage space. Is solved by expansions envelope characterized.

[0006]

In the present invention, a pair of sheets of the envelope body are integrally folded via a pressure-sensitive adhesive layer by a film laminate composed of two transparent thermoplastic resin films having substantially the same shape. It is used as an envelope in this state.

When one of the films in the film laminate of the present invention is bonded to one of the sheets of the envelope body, only the peripheral frame portion is bonded by the pressure-sensitive adhesive layer. Therefore, the one film and the one sheet of the envelope main body form a bag-shaped storage space sealed to the outside at the frame-shaped portion when the envelope main body is folded and integrated. An opening is formed on either side of the sheet or film to communicate with the storage space, through which a letter, card, photograph, or other mailing item is enclosed.

In the film laminate of the present invention, two films are formed so as to be peelable from each other by utilizing the wetting of the thermoplastic resin in a molten state. The film laminate is formed, for example, by supplying a transparent thermoplastic resin different from the transparent thermoplastic resin in a molten state between two films of a transparent thermoplastic resin and solidifying the same under cooling. Here, the melting temperature of the resin is lower than when the two films are completely bonded to each other by so-called lamination. Therefore, the two films are bonded to each other by wetting when the resin is cooled and solidified. At the boundary surface between these films, a peel strength of about several grams to 100 g / cm (peeling in a direction of 180 degrees) is formed, depending on the melting temperature and the material of the film. This is a value much smaller than the peel strength of a normal pressure-sensitive adhesive.

Therefore, a pair of sheets in which such a film laminate is sandwiched by a pressure-sensitive adhesive is always integrated, but can be easily separated by peeling the film laminate along the boundary. The respective films are adhered to the inner surface of each sheet with a pressure-sensitive adhesive, and the sheets are unfolded in a state where the description of the inner surface and the like can be seen through.
In this case, since the adhesion of the boundary surface is due to the adhesion at the time of cooling and solidification of the film bonded by wetting in the molten state, each film surface after development has no tackiness at all.

In other words, the opening of the expandable envelope of the present invention is very easy because it is not necessary to cut off the glued portion with a cutter or the like as in the prior art. Also, when the sheets are folded, it is only necessary to sandwich the film laminate between a pair of sheets or the like which have been printed in advance and bond them.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 1 is a perspective view showing an expanded state of an envelope main body used in this embodiment.

In the figure, an envelope body 1 is composed of a pair of paper sheets 3 and 4 which are folded together along a center folding line 2, and a predetermined description surface is formed on the inside of each sheet opposite to each other, and the outside of them is formed. The side surface is used for printing or writing of a destination, a transmission source, and the like as in a normal envelope.

When the sheets 3 and 4 are unfolded, the respective inner writing surfaces are covered with transparent films 7 and 8 so that they can be seen through. A bag-shaped storage space 5 is formed between the sheet 4 and the film 8, and letters, printed matter, and the like stored in the film 8 by the slit-shaped opening 6 are formed.
The card C and the like can be taken out.

FIG. 2 is an explanatory view showing a cross section of the film laminate used in the present embodiment.

In the figure, a pair of transparent polyethylene terephthalate films (hereinafter referred to as PET films) 7 and 8 having a thickness of about 40 μm are interposed therebetween with a transparent polyethylene layer (hereinafter referred to as a PE layer) 9 having a thickness of about 30 μm. Are combined. The PE layer 9 is usually about 310 degrees below the temperature at which the polyethylene film is laminated to the PET film.
It is continuously extruded between PET films 7 and 8 from a die (not shown) of an extruder at a temperature of ° C. and immediately pressed under cooling. In the figure, reference numeral 7A denotes a surface treated by corona discharge applied to the inner surface on the side of one PET film 7 in order to enhance the adhesion to the PE layer 9.

The PE layer 9 is formed by cooling the PET film 7 upon cooling and solidification.
The side is firmly adhered to the untreated surface of the PET film 8 via the treated surface 7A, and is detachably adhered to the untreated surface of the PET film 8 along the boundary surface S in the figure. The bonding at this interface S is PE
After the layer 9 is peeled off from the PET film 8, a so-called pseudo-adhesion surface showing no tackiness at all is formed.

A pressure-sensitive adhesive layer 11 is applied over the entire outer surface of the thus formed film laminate 10 on the PET film 7 side, while a peripheral frame-shaped portion is formed on the outer surface of the PET film 8 side. Only the pressure-sensitive adhesive layer 12 is applied. In addition, on both sides of the laminate 10 before being used for the production of the envelope, a silicone release paper is interposed via pressure-sensitive adhesive layers 11 and 12.
13, 14 are combined.

In the film laminate 10, PET is used.
The opening 6 is formed at a depth reaching the PE layer 9 from the surface of the film 8.
Are formed. As shown in FIG. 3, such a film laminate 10 is formed on the release sheet 14 by half-die cutting with respect to the sheet of the formed laminate. It is obtained by processing a slit line in the vicinity with a predetermined width and a predetermined interval.

As shown in FIG. 1, a card C is first placed on the inner surface of the sheet 4 of the envelope body 1 as an enclosed material. In this case, an alignment mark (X) is displayed on the inner surface of the sheet 4 at a portion corresponding to the frame portion 8A on the periphery of the film 8 to be subsequently bonded, and the card C is aligned with the mark (X). Is located inside. Next, release paper 13 from both sides of the film laminate 10 shown in FIG.
The pressure-sensitive adhesive layers 11 and 12 are exposed except for the area 14, which is sandwiched between the sheets 3 and 4 of the envelope body 1 and pressed. One PET film 8 of the film laminate 10 is adhered to the sheet 4 along a frame-shaped applied pressure-sensitive adhesive layer 12, and the other PET film 7 is applied to the entire surface of the pressure-sensitive adhesive layer.
11 adheres to the sheet 3. In this case, the film laminate 10 is adhered to the peripheral portion of the envelope body 1 with the peeled portion 15 left as a blank.

By adhering the PET film 8 to the sheet 4 at the frame-shaped portion 8A, a bag-shaped storage space 5 sealed from the outside by the film 8 and the sheet 4 is formed in a non-adhered portion therebetween. Near the upper edge of the sheet 4, a slit-shaped opening 6 communicating with the storage space 5 is formed.

When the recipient opens the envelope, the peeling between the sheets 3 and 4 is performed at the peeling portion 15 formed in the margin where the laminated body 10 on the periphery of the sheets 3 and 4 of the envelope body 1 is adhered. Start. In the peeling section 15, the peripheral edges of the sheets 3 and 4 of the envelope are slightly outside the peripheral edge of the film laminate 10, so that the free ends of the sheets 3 and 4 are easily pulled in the direction facing each other. Accordingly, the peeling force in the direction of 90-180 degrees acts on each constituent layer of the laminate 10.

Since the peeling force at the boundary surface S between the PE layer 9 and the PET film 8 is the weakest among the bonding forces between the layers, the peeling of the sheets 3 and 4 must be performed along this surface S. As a result, the PET films 7 and 8 are separated from each other, and the envelope body 1 is spread right and left in a state of being bonded to the sheets 3 and 4 via the pressure-sensitive adhesive layers 11 and 12, respectively. Here, since the films 7, 8, 9 and the pressure-sensitive adhesive layers 11, 12 are all transparent, the respective written surfaces inside the sheets 3, 4 are read therethrough. Also, the card C enclosed in the storage space 5 on the sheet 4 side can be seen through the PET film 8, so that the recipient can take out the card C from the opening 5 on the upper part of the sheet 4.

In the present embodiment, a pair of unfoldable sheets 3,
Since the description surface is provided on the envelope body 1 itself composed of the envelope 4, the envelope body 1 itself, which was merely a mere means for enclosing a message in the conventional envelope, can be used as the information description surface. Further, since the envelope is bonded by the pressure-sensitive adhesive layers 11 and 12 by the film laminate 10 including the peelable boundary surface S, the recipient simply peels the laminate 10 along the boundary surface S. By simply expanding the sheets 3 and 4, the information on the written surface inside the sheets 3 and 4 can be read.

In this case, since the PET films 7, 8 and the like of the film laminate 10 are all transparent, they can be easily read, and also function as an over-lamination having a decoration or protection effect on the sheets 3, 4. Also, since no adhesiveness remains on the film surface after peeling, the enclosed envelope is easy to handle when organizing and storing as needed.

Particularly, in this embodiment, a bag-shaped storage space 5 sealed from the outside is formed between one sheet 4 and the PET film 8 in a state where the envelope is expanded. It can be used for cards, letters and other enclosures.

Therefore, this embodiment is preferably used when the contents of the information to be mailed include a matter common to many recipients and a matter unique to each recipient. For example, when sending an invitation ticket or a membership ticket of a predetermined group, information common to all of the recipients, such as information on the venue and the rules of the group, is printed on the sheets 3 and 4 in advance. If an invitation ticket or a membership card C with a name unique to each person is sealed and sent in the storage space 5, the recipient side can handle and use the envelope body and the card separately and effectively.

Embodiment 2 FIG. 5 shows another embodiment of the present invention.

In this embodiment, the shape of the envelope body 1 is vertical, and the opening 5 of the bag-like body 1 is a film laminate.
Except for being formed on the sheet side of the envelope main body 1 instead of the 10 side, it has basically the same configuration, operation and effect as the envelope of the first embodiment.

In this embodiment, an opening 6 is formed on the sheet 4 side for communicating a bag-shaped storage space 5 formed between the sheet 4 of the envelope body 1 and the film laminate 10 with the outside. A sealing piece 16 having a shape that seals a part of the opening 6 when it is folded back is integrally formed with the upper edge of the opening 6.

After folding the envelope body 1 with the film laminate 10 sandwiched between the sheets 3 and 4, the card C is inserted into the storage space 5 from the outside of the sheet 4 through the opening 6 and The edge sealing piece 16 is folded back to cover a part of the opening 6 and adhered by an adhesive to seal the card in the envelope body 1.

In this embodiment, the sealing piece 4 is used for sealing and opening.
Although it is necessary to glue or cut off the portion A, it becomes extremely easy to manufacture the film laminate, sandwich the film into the envelope body, and insert the card C.

If the film laminate 10 used in the present invention has the peelable boundary surface S between the constituent film layers, the film laminate 10 may have any of the above-mentioned PET film-PE layer-PET film layer constitutions, if necessary. Any one can be used. For example, if the materials are different, a combination of an arbitrary thermoplastic resin such as an oriented polypropylene film and a polyethylene layer may be used. Alternatively, the polyethylene resin is simply extruded in a molten state against the surface of the PET film, and is pressed under cooling. A laminated body having a two-layer structure may be used.

Further, the hollow cylindrical body obtained by the inflation molding of the EVA composition (ethylene 95 to 85: vinyl acetate 5 to 15 parts by weight) is flattened hot and flat so that the opposing inner walls can be separated from each other. It is also possible to use bonded film laminates.

[0035]

As described above, according to the present invention, a pair of expandable sheets are folded through a transparent film laminate having a peelable boundary surface to form an envelope. The space between the body and the sheet can be used as a space for enclosing the envelope, and the sealing and unsealing can be extremely easily performed, and the inner surface of the envelope itself can be used as the information writing surface.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an expanded state of an envelope body used in the present invention.

FIG. 2 is a side view of a film laminate used for coupling the envelope body.

FIG. 3 is a top view showing a manufacturing process of the film laminate.

FIG. 4 is an explanatory diagram showing a use state of the envelope.

FIG. 5 is a perspective view showing a use mode of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Envelope main body 2 Center folding line 3, 4 Sheets 5 Bag-shaped storage space 6 Opening 7, 8 PET film 7A Corona treated surface 8A Frame portion 9 Bonding layer (PE layer) 10 Film laminate 12, 12 Pressure sensitive adhesive Layer 13, 14 Release paper 15 Release section 16 Sealing piece C Card X Alignment mark

Claims (7)

(57) [Scope of request for utility model registration] 1. A pair of sheets 3 joined along a central fold line 2 and folded so as to be deployable with each other with their inner surfaces facing each other.
4, two transparent thermoplastic resin films 7, each having substantially the same shape as each of the sheets 3, 4,
8 in which film 8 is peelably connected to each other
One of the films 8 of the film laminate 10 is fixed to the inner surface of one sheet 4 of the envelope main body 1 via a pressure-sensitive adhesive layer 12 along a peripheral frame-shaped portion 8A. The other film 7 is fixed to the inner surface of the other sheet 3 of the envelope body 1 via a transparent pressure-sensitive adhesive layer 11 over the entire surface thereof, and the frame-shaped portion of the one sheet 4 with respect to the one film 8 An unfoldable envelope, wherein a bag-shaped storage space 5 is formed between them by fixation by 8A, and an opening 6 communicating with the storage space 5 is formed. 2. The unfolded envelope according to claim 1, wherein said opening is a slit formed on one sheet side of said envelope body. 3. The unfolded envelope according to claim 1, wherein said opening is a slit formed on one film side of said film laminate. 4. The unfolded envelope according to claim 1, wherein the inner surfaces of the sheets 3 and 4 of the envelope body 1 are used as surfaces. 5. One of the films 7 and (8) of the film laminate 10 is made of a thermoplastic resin formed in advance, and the other film 8 (7) has a lower melting point than the thermoplastic resin. In the molten state, the formed film 7 (8)
2. The method as claimed in claim 1, wherein the surface is made of a thermoplastic resin pressed on the surface of the resin.
The unfolded envelope described. 6. A film between the two films 7 and 8, wherein the film laminate 10 is made of a thermoplastic resin film 7 and 8 formed in advance and a thermoplastic resin having a melting point lower than that of the thermoplastic resin. And a bonding layer 9 which is supplied in a molten state and cooled and solidified. One of the two films 7 and 8 is subjected to a surface treatment for strengthening the bonding with the bonding layer 9. The unfolded envelope according to claim 1. 7. The film laminate 10 is a pair of films that can be peeled from each other and formed by pressing a hollow cylindrical body obtained by inflation molding a thermoplastic resin film flat with hot heat. Item 2. An expanded envelope according to Item 1.